Author: "Villarroel, D." - Searchworks@Jio Institute Digital Library Search Results

Your search keyword '"Villarroel, D."' showing total 181 results

Start Over Author "Villarroel, D."

181 results on '"Villarroel, D."'

1. Consistent patterns of common species across tropical tree communities

Author: Cooper, DLM, Lewis, SL, Sullivan, MJP, Prado, PI, ter Steege, H, Barbier, N, Slik, F, Sonké, B, Ewango, CEN, Adu-Bredu, S, Affum-Baffoe, K, de Aguiar, DPP, Reategui, MAA, Aiba, SI, Albuquerque, BW, Matos, FDD, Alonso, A, Amani, CA, do Amaral, DD, do Amaral, IL, Andrade, A, Miranda, IPD, Angoboy, IB, Araujo-Murakami, A, Arboleda, NC, Arroyo, L, Ashton, P, Aymard, CGA, Baider, C, Baker, TR, Balinga, MPB, Balslev, H, Banin, LF, Bánki, OS, Baraloto, C, Barbosa, EM, Barbosa, FR, Barlow, J, Bastin, JF, Beeckman, H, Begne, S, Bengone, NN, Berenguer, E, Berry, N, Bitariho, R, Boeckx, P, Bogaert, J, Bonyoma, B, Boundja, P, Bourland, N, Bosela, FB, Brambach, F, Brienen, R, Burslem, DFRP, Camargo, JL, Campelo, W, Cano, A, Cárdenas, S, López, DC, Carpanedo, RD, Márquez, YAC, Carvalho, FA, Casas, LF, Castellanos, H, Castilho, CV, Cerón, C, Chapman, CA, Chave, J, Chhang, P, Chutipong, W, Chuyong, GB, Cintra, BBL, Clark, CJ, de Souza, FC, Comiskey, JA, Coomes, DA, Valverde, FC, Correa, DF, Costa, FRC, Costa, JBP, Couteron, P, Culmsee, H, Cuni-Sanchez, A, Dallmeier, F, Damasco, G, Dauby, G, Dávila, N, Doza, HPD, De Alban, JDT, de Assis, RL, De Canniere, C, De Haulleville, T, Carim, MDV, Demarchi, LO, Dexter, KG, Di Fiore, A, Din, HHM, Disney, MI, Djiofack, BY, Djuikouo, MNK, Van Do, T, Doucet, JL, Draper, FC, Droissart, V, Duivenvoorden, JF, Engel, J, Estienne, V, Farfan-Rios, W, Fauset, S, Feeley, KJ, Feitosa, YO, Feldpausch, TR, Ferreira, C, Ferreira, J, Ferreira, LV, Fletcher, CD, Flores, BM, Fofanah, A, Foli, EG, Fonty, E, Fredriksson, GM, Fuentes, A, Galbraith, D, Gonzales, GPG, Garcia-Cabrera, K, García-Villacorta, R, Gomes, VHF, Gómez, RZ, Gonzales, T, Gribel, R, Guedes, MC, Guevara, JE, Hakeem, KR, Hall, JS, Hamer, KC, Harrison, RD, Harris, DJ, Hart, TB, Hector, A, Henkel, TW, Herbohn, J, Hockemba, MBN, Hoffman, B, Holmgren, M, Coronado, ENH, Huamantupa-Chuquimaco, I, Hubau, W, Imai, N, Irume, MV, Jansen, PA, Jeffery, KJ, Jimenez, EM, Jucker, T, Junqueira, AB, Kalamandeen, M, Kamdem, NG, Kartawinata, K, Yakusu, EK, Katembo, JM, Kearsley, E, Kenfack, D, Kessler, M, Khaing, TT, Killeen, TJ, Kitayama, K, Klitgaard, B, Labriere, N, Laumonier, Y, Laurance, SGW, Laurance, WF, Laurent, F, Le, TC, Leal, ME, Novo, EMLD, Levesley, A, Libalah, MB, Licona, JC, Lima, DD, Lindsell, JA, Lopes, A, Lopes, MA, Lovett, JC, Lowe, R, Lozada, JR, Lu, XH, Luambua, NK, Luize, BG, Maas, P, Magalhaes, JLL, Magnusson, WE, Mahayani, NPD, Makana, JR, Malhi, Y, Rincón, LM, Mansor, A, Manzatto, AG, Marimon, BS, Marimon, BH Jr, Marshall, AR, Martins, MP, Mbayu, FM, de Medeiros, MB, Mesones, I, Metali, F, Mihindou, V, Millet, J, Milliken, W, Mogollon, HF, Molino, JF, Said, MNM, Mendoza, AM, Montero, JC, Moore, S, Mostacedo, B, Pinto, LFM, Mukul, SA, Munishi, PKT, Nagamasu, H, Nascimento, HEM, Nascimento, MT, Neill, D, Nilus, R, Noronha, JC, Nsenga, L, Vargas, PN, Ojo, L, Oliveira, AA, de Oliveira, EA, Ondo, FE, Cuenca, WP, Pansini, S, Pansonato, MP, Paredes, MR, Paudel, E, Pauletto, D, Pearson, RG, Pena, JLM, Pennington, RT, Peres, CA, Permana, A, Petronelli, P, Mora, MCP, Phillips, JF, Phillips, OL, Pickavance, G, Piedade, MTF, Pitman, NCA, Ploton, P, Popelier, A, Poulsen, JR, Prieto, A, Primack, RB, Priyadi, H, Qie, L, Quaresma, AC, de Queiroz, HL, Ramirez-Angulo, H, Ramos, JF, Reis, NFC, Reitsma, J, Revilla, JDC, Riutta, T, Rivas-Torres, G, Robiansyah, I, Rocha, M, Rodrigues, DD, Rodriguez-Ronderos, ME, Rovero, F, Rozak, AH, Rudas, A, Rutishauser, E, Sabatier, D, Sagang, L, Sampaio, AF, Samsoedin, I, Satdichanh, M, Schietti, J, Schöngart, J, Scudeller, VV, Seuaturien, N, Sheil, D, Sierra, R, Silman, MR, Silva, TSF, Guimaraes, JRD, Simo-Droissart, M, Simon, MF, Sist, P, Sousa, TR, Farias, ED, Coelho, LD, Spracklen, DV, Stas, SM, Steinmetz, R, Stevenson, PR, Stropp, J, Sukri, RS, Sunderland, TCH, Suzuki, E, Swaine, MD, Tang, JW, Taplin, J, Taylor, DM, Tello, JS, Terborgh, J, Texier, N, Theilade, I, Thomas, DW, Thomas, R, Thomas, SC, Tirado, M, Toirambe, B, de Toledo, JJ, Tomlinson, KW, Torres-Lezama, A, Tran, HD, Mukendi, JT, Tumaneng, RD, Umaña, MN, Umunay, PM, Giraldo, LEU, Sandoval, EHV, Gamarra, LV, Van Andel, TR, van de Bult, M, van de Pol, J, van der Heijden, G, Vasquez, R, Vela, CIA, Venticinque, EM, Verbeeck, H, Veridiano, RKA, Vicentini, A, Vieira, ICG, Torre, EV, Villarroel, D, Zegarra, BEV, Vleminckx, J, von Hildebrand, P, Vos, VA, Vriesendorp, C, Webb, EL, White, LJT, Wich, S, Wittmann, F, Zagt, R, Zang, RG, Zartman, CE, Zemagho, L, Zent, EL, Zent, S, Cooper, DLM, Lewis, SL, Sullivan, MJP, Prado, PI, ter Steege, H, Barbier, N, Slik, F, Sonké, B, Ewango, CEN, Adu-Bredu, S, Affum-Baffoe, K, de Aguiar, DPP, Reategui, MAA, Aiba, SI, Albuquerque, BW, Matos, FDD, Alonso, A, Amani, CA, do Amaral, DD, do Amaral, IL, Andrade, A, Miranda, IPD, Angoboy, IB, Araujo-Murakami, A, Arboleda, NC, Arroyo, L, Ashton, P, Aymard, CGA, Baider, C, Baker, TR, Balinga, MPB, Balslev, H, Banin, LF, Bánki, OS, Baraloto, C, Barbosa, EM, Barbosa, FR, Barlow, J, Bastin, JF, Beeckman, H, Begne, S, Bengone, NN, Berenguer, E, Berry, N, Bitariho, R, Boeckx, P, Bogaert, J, Bonyoma, B, Boundja, P, Bourland, N, Bosela, FB, Brambach, F, Brienen, R, Burslem, DFRP, Camargo, JL, Campelo, W, Cano, A, Cárdenas, S, López, DC, Carpanedo, RD, Márquez, YAC, Carvalho, FA, Casas, LF, Castellanos, H, Castilho, CV, Cerón, C, Chapman, CA, Chave, J, Chhang, P, Chutipong, W, Chuyong, GB, Cintra, BBL, Clark, CJ, de Souza, FC, Comiskey, JA, Coomes, DA, Valverde, FC, Correa, DF, Costa, FRC, Costa, JBP, Couteron, P, Culmsee, H, Cuni-Sanchez, A, Dallmeier, F, Damasco, G, Dauby, G, Dávila, N, Doza, HPD, De Alban, JDT, de Assis, RL, De Canniere, C, De Haulleville, T, Carim, MDV, Demarchi, LO, Dexter, KG, Di Fiore, A, Din, HHM, Disney, MI, Djiofack, BY, Djuikouo, MNK, Van Do, T, Doucet, JL, Draper, FC, Droissart, V, Duivenvoorden, JF, Engel, J, Estienne, V, Farfan-Rios, W, Fauset, S, Feeley, KJ, Feitosa, YO, Feldpausch, TR, Ferreira, C, Ferreira, J, Ferreira, LV, Fletcher, CD, Flores, BM, Fofanah, A, Foli, EG, Fonty, E, Fredriksson, GM, Fuentes, A, Galbraith, D, Gonzales, GPG, Garcia-Cabrera, K, García-Villacorta, R, Gomes, VHF, Gómez, RZ, Gonzales, T, Gribel, R, Guedes, MC, Guevara, JE, Hakeem, KR, Hall, JS, Hamer, KC, Harrison, RD, Harris, DJ, Hart, TB, Hector, A, Henkel, TW, Herbohn, J, Hockemba, MBN, Hoffman, B, Holmgren, M, Coronado, ENH, Huamantupa-Chuquimaco, I, Hubau, W, Imai, N, Irume, MV, Jansen, PA, Jeffery, KJ, Jimenez, EM, Jucker, T, Junqueira, AB, Kalamandeen, M, Kamdem, NG, Kartawinata, K, Yakusu, EK, Katembo, JM, Kearsley, E, Kenfack, D, Kessler, M, Khaing, TT, Killeen, TJ, Kitayama, K, Klitgaard, B, Labriere, N, Laumonier, Y, Laurance, SGW, Laurance, WF, Laurent, F, Le, TC, Leal, ME, Novo, EMLD, Levesley, A, Libalah, MB, Licona, JC, Lima, DD, Lindsell, JA, Lopes, A, Lopes, MA, Lovett, JC, Lowe, R, Lozada, JR, Lu, XH, Luambua, NK, Luize, BG, Maas, P, Magalhaes, JLL, Magnusson, WE, Mahayani, NPD, Makana, JR, Malhi, Y, Rincón, LM, Mansor, A, Manzatto, AG, Marimon, BS, Marimon, BH Jr, Marshall, AR, Martins, MP, Mbayu, FM, de Medeiros, MB, Mesones, I, Metali, F, Mihindou, V, Millet, J, Milliken, W, Mogollon, HF, Molino, JF, Said, MNM, Mendoza, AM, Montero, JC, Moore, S, Mostacedo, B, Pinto, LFM, Mukul, SA, Munishi, PKT, Nagamasu, H, Nascimento, HEM, Nascimento, MT, Neill, D, Nilus, R, Noronha, JC, Nsenga, L, Vargas, PN, Ojo, L, Oliveira, AA, de Oliveira, EA, Ondo, FE, Cuenca, WP, Pansini, S, Pansonato, MP, Paredes, MR, Paudel, E, Pauletto, D, Pearson, RG, Pena, JLM, Pennington, RT, Peres, CA, Permana, A, Petronelli, P, Mora, MCP, Phillips, JF, Phillips, OL, Pickavance, G, Piedade, MTF, Pitman, NCA, Ploton, P, Popelier, A, Poulsen, JR, Prieto, A, Primack, RB, Priyadi, H, Qie, L, Quaresma, AC, de Queiroz, HL, Ramirez-Angulo, H, Ramos, JF, Reis, NFC, Reitsma, J, Revilla, JDC, Riutta, T, Rivas-Torres, G, Robiansyah, I, Rocha, M, Rodrigues, DD, Rodriguez-Ronderos, ME, Rovero, F, Rozak, AH, Rudas, A, Rutishauser, E, Sabatier, D, Sagang, L, Sampaio, AF, Samsoedin, I, Satdichanh, M, Schietti, J, Schöngart, J, Scudeller, VV, Seuaturien, N, Sheil, D, Sierra, R, Silman, MR, Silva, TSF, Guimaraes, JRD, Simo-Droissart, M, Simon, MF, Sist, P, Sousa, TR, Farias, ED, Coelho, LD, Spracklen, DV, Stas, SM, Steinmetz, R, Stevenson, PR, Stropp, J, Sukri, RS, Sunderland, TCH, Suzuki, E, Swaine, MD, Tang, JW, Taplin, J, Taylor, DM, Tello, JS, Terborgh, J, Texier, N, Theilade, I, Thomas, DW, Thomas, R, Thomas, SC, Tirado, M, Toirambe, B, de Toledo, JJ, Tomlinson, KW, Torres-Lezama, A, Tran, HD, Mukendi, JT, Tumaneng, RD, Umaña, MN, Umunay, PM, Giraldo, LEU, Sandoval, EHV, Gamarra, LV, Van Andel, TR, van de Bult, M, van de Pol, J, van der Heijden, G, Vasquez, R, Vela, CIA, Venticinque, EM, Verbeeck, H, Veridiano, RKA, Vicentini, A, Vieira, ICG, Torre, EV, Villarroel, D, Zegarra, BEV, Vleminckx, J, von Hildebrand, P, Vos, VA, Vriesendorp, C, Webb, EL, White, LJT, Wich, S, Wittmann, F, Zagt, R, Zang, RG, Zartman, CE, Zemagho, L, Zent, EL, and Zent, S
Abstract: Trees structure the Earth’s most biodiverse ecosystem, tropical forests. The vast number of tree species presents a formidable challenge to understanding these forests, including their response to environmental change, as very little is known about most tropical tree species. A focus on the common species may circumvent this challenge. Here we investigate abundance patterns of common tree species using inventory data on 1,003,805 trees with trunk diameters of at least 10 cm across 1,568 locations 1–6 in closed-canopy, structurally intact old-growth tropical forests in Africa, Amazonia and Southeast Asia. We estimate that 2.2%, 2.2% and 2.3% of species comprise 50% of the tropical trees in these regions, respectively. Extrapolating across all closed-canopy tropical forests, we estimate that just 1,053 species comprise half of Earth’s 800 billion tropical trees with trunk diameters of at least 10 cm. Despite differing biogeographic, climatic and anthropogenic histories 7, we find notably consistent patterns of common species and species abundance distributions across the continents. This suggests that fundamental mechanisms of tree community assembly may apply to all tropical forests. Resampling analyses show that the most common species are likely to belong to a manageable list of known species, enabling targeted efforts to understand their ecology. Although they do not detract from the importance of rare species, our results open new opportunities to understand the world’s most diverse forests, including modelling their response to environmental change, by focusing on the common species that constitute the majority of their trees.
Published: 2024

2. Consistent patterns of common species across tropical tree communities

Author: Sub Ecology and Biodiversity, Ecology and Biodiversity, Cooper, DLM, Lewis, SL, Sullivan, MJP, Prado, PI, ter Steege, H, Barbier, N, Slik, F, Sonké, B, Ewango, CEN, Adu-Bredu, S, Affum-Baffoe, K, de Aguiar, DPP, Reategui, MAA, Aiba, SI, Albuquerque, BW, Matos, FDD, Alonso, A, Amani, CA, do Amaral, DD, do Amaral, IL, Andrade, A, Miranda, IPD, Angoboy, IB, Araujo-Murakami, A, Arboleda, NC, Arroyo, L, Ashton, P, Aymard, CGA, Baider, C, Baker, TR, Balinga, MPB, Balslev, H, Banin, LF, Bánki, OS, Baraloto, C, Barbosa, EM, Barbosa, FR, Barlow, J, Bastin, JF, Beeckman, H, Begne, S, Bengone, NN, Berenguer, E, Berry, N, Bitariho, R, Boeckx, P, Bogaert, J, Bonyoma, B, Boundja, P, Bourland, N, Bosela, FB, Brambach, F, Brienen, R, Burslem, DFRP, Camargo, JL, Campelo, W, Cano, A, Cárdenas, S, López, DC, Carpanedo, RD, Márquez, YAC, Carvalho, FA, Casas, LF, Castellanos, H, Castilho, CV, Cerón, C, Chapman, CA, Chave, J, Chhang, P, Chutipong, W, Chuyong, GB, Cintra, BBL, Clark, CJ, de Souza, FC, Comiskey, JA, Coomes, DA, Valverde, FC, Correa, DF, Costa, FRC, Costa, JBP, Couteron, P, Culmsee, H, Cuni-Sanchez, A, Dallmeier, F, Damasco, G, Dauby, G, Dávila, N, Doza, HPD, De Alban, JDT, de Assis, RL, De Canniere, C, De Haulleville, T, Carim, MDV, Demarchi, LO, Dexter, KG, Di Fiore, A, Din, HHM, Disney, MI, Djiofack, BY, Djuikouo, MNK, Van Do, T, Doucet, JL, Draper, FC, Droissart, V, Duivenvoorden, JF, Engel, J, Estienne, V, Farfan-Rios, W, Fauset, S, Feeley, KJ, Feitosa, YO, Feldpausch, TR, Ferreira, C, Ferreira, J, Ferreira, LV, Fletcher, CD, Flores, BM, Fofanah, A, Foli, EG, Fonty, E, Fredriksson, GM, Fuentes, A, Galbraith, D, Gonzales, GPG, Garcia-Cabrera, K, García-Villacorta, R, Gomes, VHF, Gómez, RZ, Gonzales, T, Gribel, R, Guedes, MC, Guevara, JE, Hakeem, KR, Hall, JS, Hamer, KC, Harrison, RD, Harris, DJ, Hart, TB, Hector, A, Henkel, TW, Herbohn, J, Hockemba, MBN, Hoffman, B, Holmgren, M, Coronado, ENH, Huamantupa-Chuquimaco, I, Hubau, W, Imai, N, Irume, MV, Jansen, PA, Jeffery, KJ, Jimenez, EM, Jucker, T, Junqueira, AB, Kalamandeen, M, Kamdem, NG, Kartawinata, K, Yakusu, EK, Katembo, JM, Kearsley, E, Kenfack, D, Kessler, M, Khaing, TT, Killeen, TJ, Kitayama, K, Klitgaard, B, Labriere, N, Laumonier, Y, Laurance, SGW, Laurance, WF, Laurent, F, Le, TC, Leal, ME, Novo, EMLD, Levesley, A, Libalah, MB, Licona, JC, Lima, DD, Lindsell, JA, Lopes, A, Lopes, MA, Lovett, JC, Lowe, R, Lozada, JR, Lu, XH, Luambua, NK, Luize, BG, Maas, P, Magalhaes, JLL, Magnusson, WE, Mahayani, NPD, Makana, JR, Malhi, Y, Rincón, LM, Mansor, A, Manzatto, AG, Marimon, BS, Marimon, BH Jr, Marshall, AR, Martins, MP, Mbayu, FM, de Medeiros, MB, Mesones, I, Metali, F, Mihindou, V, Millet, J, Milliken, W, Mogollon, HF, Molino, JF, Said, MNM, Mendoza, AM, Montero, JC, Moore, S, Mostacedo, B, Pinto, LFM, Mukul, SA, Munishi, PKT, Nagamasu, H, Nascimento, HEM, Nascimento, MT, Neill, D, Nilus, R, Noronha, JC, Nsenga, L, Vargas, PN, Ojo, L, Oliveira, AA, de Oliveira, EA, Ondo, FE, Cuenca, WP, Pansini, S, Pansonato, MP, Paredes, MR, Paudel, E, Pauletto, D, Pearson, RG, Pena, JLM, Pennington, RT, Peres, CA, Permana, A, Petronelli, P, Mora, MCP, Phillips, JF, Phillips, OL, Pickavance, G, Piedade, MTF, Pitman, NCA, Ploton, P, Popelier, A, Poulsen, JR, Prieto, A, Primack, RB, Priyadi, H, Qie, L, Quaresma, AC, de Queiroz, HL, Ramirez-Angulo, H, Ramos, JF, Reis, NFC, Reitsma, J, Revilla, JDC, Riutta, T, Rivas-Torres, G, Robiansyah, I, Rocha, M, Rodrigues, DD, Rodriguez-Ronderos, ME, Rovero, F, Rozak, AH, Rudas, A, Rutishauser, E, Sabatier, D, Sagang, L, Sampaio, AF, Samsoedin, I, Satdichanh, M, Schietti, J, Schöngart, J, Scudeller, VV, Seuaturien, N, Sheil, D, Sierra, R, Silman, MR, Silva, TSF, Guimaraes, JRD, Simo-Droissart, M, Simon, MF, Sist, P, Sousa, TR, Farias, ED, Coelho, LD, Spracklen, DV, Stas, SM, Steinmetz, R, Stevenson, PR, Stropp, J, Sukri, RS, Sunderland, TCH, Suzuki, E, Swaine, MD, Tang, JW, Taplin, J, Taylor, DM, Tello, JS, Terborgh, J, Texier, N, Theilade, I, Thomas, DW, Thomas, R, Thomas, SC, Tirado, M, Toirambe, B, de Toledo, JJ, Tomlinson, KW, Torres-Lezama, A, Tran, HD, Mukendi, JT, Tumaneng, RD, Umaña, MN, Umunay, PM, Giraldo, LEU, Sandoval, EHV, Gamarra, LV, Van Andel, TR, van de Bult, M, van de Pol, J, van der Heijden, G, Vasquez, R, Vela, CIA, Venticinque, EM, Verbeeck, H, Veridiano, RKA, Vicentini, A, Vieira, ICG, Torre, EV, Villarroel, D, Zegarra, BEV, Vleminckx, J, von Hildebrand, P, Vos, VA, Vriesendorp, C, Webb, EL, White, LJT, Wich, S, Wittmann, F, Zagt, R, Zang, RG, Zartman, CE, Zemagho, L, Zent, EL, Zent, S, Sub Ecology and Biodiversity, Ecology and Biodiversity, Cooper, DLM, Lewis, SL, Sullivan, MJP, Prado, PI, ter Steege, H, Barbier, N, Slik, F, Sonké, B, Ewango, CEN, Adu-Bredu, S, Affum-Baffoe, K, de Aguiar, DPP, Reategui, MAA, Aiba, SI, Albuquerque, BW, Matos, FDD, Alonso, A, Amani, CA, do Amaral, DD, do Amaral, IL, Andrade, A, Miranda, IPD, Angoboy, IB, Araujo-Murakami, A, Arboleda, NC, Arroyo, L, Ashton, P, Aymard, CGA, Baider, C, Baker, TR, Balinga, MPB, Balslev, H, Banin, LF, Bánki, OS, Baraloto, C, Barbosa, EM, Barbosa, FR, Barlow, J, Bastin, JF, Beeckman, H, Begne, S, Bengone, NN, Berenguer, E, Berry, N, Bitariho, R, Boeckx, P, Bogaert, J, Bonyoma, B, Boundja, P, Bourland, N, Bosela, FB, Brambach, F, Brienen, R, Burslem, DFRP, Camargo, JL, Campelo, W, Cano, A, Cárdenas, S, López, DC, Carpanedo, RD, Márquez, YAC, Carvalho, FA, Casas, LF, Castellanos, H, Castilho, CV, Cerón, C, Chapman, CA, Chave, J, Chhang, P, Chutipong, W, Chuyong, GB, Cintra, BBL, Clark, CJ, de Souza, FC, Comiskey, JA, Coomes, DA, Valverde, FC, Correa, DF, Costa, FRC, Costa, JBP, Couteron, P, Culmsee, H, Cuni-Sanchez, A, Dallmeier, F, Damasco, G, Dauby, G, Dávila, N, Doza, HPD, De Alban, JDT, de Assis, RL, De Canniere, C, De Haulleville, T, Carim, MDV, Demarchi, LO, Dexter, KG, Di Fiore, A, Din, HHM, Disney, MI, Djiofack, BY, Djuikouo, MNK, Van Do, T, Doucet, JL, Draper, FC, Droissart, V, Duivenvoorden, JF, Engel, J, Estienne, V, Farfan-Rios, W, Fauset, S, Feeley, KJ, Feitosa, YO, Feldpausch, TR, Ferreira, C, Ferreira, J, Ferreira, LV, Fletcher, CD, Flores, BM, Fofanah, A, Foli, EG, Fonty, E, Fredriksson, GM, Fuentes, A, Galbraith, D, Gonzales, GPG, Garcia-Cabrera, K, García-Villacorta, R, Gomes, VHF, Gómez, RZ, Gonzales, T, Gribel, R, Guedes, MC, Guevara, JE, Hakeem, KR, Hall, JS, Hamer, KC, Harrison, RD, Harris, DJ, Hart, TB, Hector, A, Henkel, TW, Herbohn, J, Hockemba, MBN, Hoffman, B, Holmgren, M, Coronado, ENH, Huamantupa-Chuquimaco, I, Hubau, W, Imai, N, Irume, MV, Jansen, PA, Jeffery, KJ, Jimenez, EM, Jucker, T, Junqueira, AB, Kalamandeen, M, Kamdem, NG, Kartawinata, K, Yakusu, EK, Katembo, JM, Kearsley, E, Kenfack, D, Kessler, M, Khaing, TT, Killeen, TJ, Kitayama, K, Klitgaard, B, Labriere, N, Laumonier, Y, Laurance, SGW, Laurance, WF, Laurent, F, Le, TC, Leal, ME, Novo, EMLD, Levesley, A, Libalah, MB, Licona, JC, Lima, DD, Lindsell, JA, Lopes, A, Lopes, MA, Lovett, JC, Lowe, R, Lozada, JR, Lu, XH, Luambua, NK, Luize, BG, Maas, P, Magalhaes, JLL, Magnusson, WE, Mahayani, NPD, Makana, JR, Malhi, Y, Rincón, LM, Mansor, A, Manzatto, AG, Marimon, BS, Marimon, BH Jr, Marshall, AR, Martins, MP, Mbayu, FM, de Medeiros, MB, Mesones, I, Metali, F, Mihindou, V, Millet, J, Milliken, W, Mogollon, HF, Molino, JF, Said, MNM, Mendoza, AM, Montero, JC, Moore, S, Mostacedo, B, Pinto, LFM, Mukul, SA, Munishi, PKT, Nagamasu, H, Nascimento, HEM, Nascimento, MT, Neill, D, Nilus, R, Noronha, JC, Nsenga, L, Vargas, PN, Ojo, L, Oliveira, AA, de Oliveira, EA, Ondo, FE, Cuenca, WP, Pansini, S, Pansonato, MP, Paredes, MR, Paudel, E, Pauletto, D, Pearson, RG, Pena, JLM, Pennington, RT, Peres, CA, Permana, A, Petronelli, P, Mora, MCP, Phillips, JF, Phillips, OL, Pickavance, G, Piedade, MTF, Pitman, NCA, Ploton, P, Popelier, A, Poulsen, JR, Prieto, A, Primack, RB, Priyadi, H, Qie, L, Quaresma, AC, de Queiroz, HL, Ramirez-Angulo, H, Ramos, JF, Reis, NFC, Reitsma, J, Revilla, JDC, Riutta, T, Rivas-Torres, G, Robiansyah, I, Rocha, M, Rodrigues, DD, Rodriguez-Ronderos, ME, Rovero, F, Rozak, AH, Rudas, A, Rutishauser, E, Sabatier, D, Sagang, L, Sampaio, AF, Samsoedin, I, Satdichanh, M, Schietti, J, Schöngart, J, Scudeller, VV, Seuaturien, N, Sheil, D, Sierra, R, Silman, MR, Silva, TSF, Guimaraes, JRD, Simo-Droissart, M, Simon, MF, Sist, P, Sousa, TR, Farias, ED, Coelho, LD, Spracklen, DV, Stas, SM, Steinmetz, R, Stevenson, PR, Stropp, J, Sukri, RS, Sunderland, TCH, Suzuki, E, Swaine, MD, Tang, JW, Taplin, J, Taylor, DM, Tello, JS, Terborgh, J, Texier, N, Theilade, I, Thomas, DW, Thomas, R, Thomas, SC, Tirado, M, Toirambe, B, de Toledo, JJ, Tomlinson, KW, Torres-Lezama, A, Tran, HD, Mukendi, JT, Tumaneng, RD, Umaña, MN, Umunay, PM, Giraldo, LEU, Sandoval, EHV, Gamarra, LV, Van Andel, TR, van de Bult, M, van de Pol, J, van der Heijden, G, Vasquez, R, Vela, CIA, Venticinque, EM, Verbeeck, H, Veridiano, RKA, Vicentini, A, Vieira, ICG, Torre, EV, Villarroel, D, Zegarra, BEV, Vleminckx, J, von Hildebrand, P, Vos, VA, Vriesendorp, C, Webb, EL, White, LJT, Wich, S, Wittmann, F, Zagt, R, Zang, RG, Zartman, CE, Zemagho, L, Zent, EL, and Zent, S
Published: 2024

3. Persistent effects of pre-Columbian plant domestication on Amazonian forest composition

Author: Levis, C., Costa, F. R. C., Bongers, F., Peña-Claros, M., Clement, C. R., Junqueira, A. B., Neves, E. G., Tamanaha, E. K., Figueiredo, F. O. G., Salomão, R. P., Castilho, C. V., Magnusson, W. E., Phillips, O. L., Guevara, J. E., Sabatier, D., Molino, J.-F., López, D. Cárdenas, Mendoza, A. M., Pitman, N. C. A., Duque, A., Vargas, P. Núñez, Zartman, C. E., Vasquez, R., Andrade, A., Camargo, J. L., Feldpausch, T. R., Laurance, S. G. W., Laurance, W. F., Killeen, T. J., Nascimento, H. E. Mendonça, Montero, J. C., Mostacedo, B., Amaral, I. L., Vieira, I. C. Guimarães, Brienen, R., Castellanos, H., Terborgh, J., de Jesus Veiga Carim, M., da Silva Guimarães, J. R., de Souza Coelho, L., de Almeida Matos, F. D., Wittmann, F., Mogollón, H. F., Damasco, G., Dávila, N., García-Villacorta, R., Coronado, E. N. H., Emilio, T., de Andrade Lima Filho, D., Schietti, J., Souza, P., Targhetta, N., Comiskey, J. A., Marimon, B. S., Marimon, B.-H., Neill, D., Alonso, A., Arroyo, L., Carvalho, F. A., de Souza, F. C., Dallmeier, F., Pansonato, M. P., Duivenvoorden, J. F., Fine, P. V. A., Stevenson, P. R., Araujo-Murakami, A., Aymard C., G. A., Baraloto, C., do Amaral, D. D., Engel, J., Henkel, T. W., Maas, P., Petronelli, P., Revilla, J. D. Cardenas, Stropp, J., Daly, D., Gribel, R., Paredes, M. Ríos, Silveira, M., Thomas-Caesar, R., Baker, T. R., da Silva, N. F., Ferreira, L. V., Peres, C. A., Silman, M. R., Cerón, C., Valverde, F. C., Di Fiore, A., Jimenez, E. M., Mora, M. C. Peñuela, Toledo, M., Barbosa, E. M., de Matos Bonates, L. C., Arboleda, N. C., de Sousa Farias, E., Fuentes, A., Guillaumet, J.-L., Jørgensen, P. Møller, Malhi, Y., de Andrade Miranda, I. P., Phillips, J. F., Prieto, A., Rudas, A., Ruschel, A. R., Silva, N., von Hildebrand, P., Vos, V. A., Zent, E. L., Zent, S., Cintra, B. B. L., Nascimento, M. T., Oliveira, A. A., Ramirez-Angulo, H., Ramos, J. F., Rivas, G., Schöngart, J., Sierra, R., Tirado, M., van der Heijden, G., Torre, E. V., Wang, O., Young, K. R., Baider, C., Cano, A., Farfan-Rios, W., Ferreira, C., Hoffman, B., Mendoza, C., Mesones, I., Torres-Lezama, A., Medina, M. N. U., van Andel, T. R., Villarroel, D., Zagt, R., Alexiades, M. N., Balslev, H., Garcia-Cabrera, K., Gonzales, T., Hernandez, L., Huamantupa-Chuquimaco, I., Manzatto, A. G., Milliken, W., Cuenca, W. P., Pansini, S., Pauletto, D., Arevalo, F. R., Reis, N. F. Costa, Sampaio, A. F., Giraldo, L. E. Urrego, Sandoval, E. H. Valderrama, Gamarra, L. Valenzuela, Vela, C. I. A., and ter Steege, H.
Published: 2017

4. IDF2022-0069 Changing the vision of diabetes education in Latin America: Clinical Practice Guideline on Diabetes Education, IDF-SACA

Author: Rodriguez, B., primary, Sánchez, A.F., additional, and Villarroel, D., additional
Published: 2023
Full Text: View/download PDF

5. Effect of COVID-19 lockdown on blood pressure in hypertensive adult patients: A systematic review

Author: Fernández-Cao, J.C., primary, Villarroel, D., additional, Silva, C., additional, Doepking, C., additional, and Rojas, J., additional
Published: 2023
Full Text: View/download PDF

6. Local hydrological conditions influence tree diversity and composition across the Amazon basin

Author: Marca-Zevallos, M.J., Moulatlet, G.M., Sousa, T.R., Schietti, J., Coelho, L.D.S., Ramos, J.F., Lima Filho, D.D.A., Amaral, I.L., de Almeida Matos, F.D., Rincón, L.M., Cardenas Revilla, J.D., Pansonato, M.P., Gribel, R., Barbosa, E.M., Miranda, I.P.D.A., Bonates, L.C.D.M., Guevara, J.E., Salomão, R.P., Ferreira, L.V., Dantas do Amaral, D., Pitman, N.C.A., Vriesendorp, C., Baker, T.R., Brienen, R., Carim, M.D.J.V., Guimarães, J.R.D.S., Núñez Vargas, P., Huamantupa-Chuquimaco, I., Laurance, W.F., Laurance, S.G.W., Andrade, A., Camargo, J.L., Monteagudo Mendoza, A., Vasquez, R., Valenzuela Gamarra, L., Mogollón, H.F., Marimon-Junior, B.H., Marimon, B.S., Killeen, T.J., Farias, E.D.S., Neill, D., de Medeiros, M.B., Simon, M.F., Terborgh, J., Carlos Montero, J., Licona, J.C., Mostacedo, B., García-Villacorta, R., Araujo-Murakami, A., Arroyo, L., Villarroel, D., Dávila, N., Coelho de Souza, F., Carvalho, F.A., Comiskey, J.A., Alonso, A., Dallmeier, F., Oliveira, A.A., Castilho, C.V., Lloyd, J., Feldpausch, T.R., Ríos Paredes, M., Castaño Arboleda, N., Cárdenas López, D., Aymard Corredor, G.A., Di Fiore, A., Rudas, A., Prieto, A., Barbosa, F.R., Noronha, J.C., Rodrigues, D.D.J., Carpanedo, R.D.S.á., Honorio Coronado, E.N., Peres, C.A., Milliken, W., Fuentes, A., Tello, J.S., Cerón, C., Klitgaard, B., Tirado, M., Sierra, R., Young, K.R., Rivas-Torres, G.F., Stevenson, P.R., Cano, A., Wang, O., Baider, C., Barlow, J., Ferreira, J., Berenguer, E., Stropp, J., Balslev, H., Ahuite Reategui, M.A., Mesones, I., Valderrama Sandoval, E.H., Gonzales, T., Pansini, S., Reis, N.F.C., Sampaio, A.F., Vos, V.A., Palacios Cuenca, W., Manzatto, A.G., Farfan-Rios, W., Silman, M.R., Garcia-Cabrera, K., von Hildebrand, P., Guedes, M.C., Costa, J.B.P., Phillips, J.F., Vela, C.I.A., de Toledo, J.J., Pauletto, D., Valverde, F.C., Umaña, M.N., Phillips, O.L., Magnusson, W.E., ter Steege, H., Costa, F.R.C., Marca-Zevallos, M.J., Moulatlet, G.M., Sousa, T.R., Schietti, J., Coelho, L.D.S., Ramos, J.F., Lima Filho, D.D.A., Amaral, I.L., de Almeida Matos, F.D., Rincón, L.M., Cardenas Revilla, J.D., Pansonato, M.P., Gribel, R., Barbosa, E.M., Miranda, I.P.D.A., Bonates, L.C.D.M., Guevara, J.E., Salomão, R.P., Ferreira, L.V., Dantas do Amaral, D., Pitman, N.C.A., Vriesendorp, C., Baker, T.R., Brienen, R., Carim, M.D.J.V., Guimarães, J.R.D.S., Núñez Vargas, P., Huamantupa-Chuquimaco, I., Laurance, W.F., Laurance, S.G.W., Andrade, A., Camargo, J.L., Monteagudo Mendoza, A., Vasquez, R., Valenzuela Gamarra, L., Mogollón, H.F., Marimon-Junior, B.H., Marimon, B.S., Killeen, T.J., Farias, E.D.S., Neill, D., de Medeiros, M.B., Simon, M.F., Terborgh, J., Carlos Montero, J., Licona, J.C., Mostacedo, B., García-Villacorta, R., Araujo-Murakami, A., Arroyo, L., Villarroel, D., Dávila, N., Coelho de Souza, F., Carvalho, F.A., Comiskey, J.A., Alonso, A., Dallmeier, F., Oliveira, A.A., Castilho, C.V., Lloyd, J., Feldpausch, T.R., Ríos Paredes, M., Castaño Arboleda, N., Cárdenas López, D., Aymard Corredor, G.A., Di Fiore, A., Rudas, A., Prieto, A., Barbosa, F.R., Noronha, J.C., Rodrigues, D.D.J., Carpanedo, R.D.S.á., Honorio Coronado, E.N., Peres, C.A., Milliken, W., Fuentes, A., Tello, J.S., Cerón, C., Klitgaard, B., Tirado, M., Sierra, R., Young, K.R., Rivas-Torres, G.F., Stevenson, P.R., Cano, A., Wang, O., Baider, C., Barlow, J., Ferreira, J., Berenguer, E., Stropp, J., Balslev, H., Ahuite Reategui, M.A., Mesones, I., Valderrama Sandoval, E.H., Gonzales, T., Pansini, S., Reis, N.F.C., Sampaio, A.F., Vos, V.A., Palacios Cuenca, W., Manzatto, A.G., Farfan-Rios, W., Silman, M.R., Garcia-Cabrera, K., von Hildebrand, P., Guedes, M.C., Costa, J.B.P., Phillips, J.F., Vela, C.I.A., de Toledo, J.J., Pauletto, D., Valverde, F.C., Umaña, M.N., Phillips, O.L., Magnusson, W.E., ter Steege, H., and Costa, F.R.C.
Abstract: Tree diversity and composition in Amazonia are known to be strongly determined by the water supplied by precipitation. Nevertheless, within the same climatic regime, water availability is modulated by local topography and soil characteristics (hereafter referred to as local hydrological conditions), varying from saturated and poorly drained to well-drained and potentially dry areas. While these conditions may be expected to influence species distribution, the impacts of local hydrological conditions on tree diversity and composition remain poorly understood at the whole Amazon basin scale. Using a dataset of 443 1-ha non-flooded forest plots distributed across the basin, we investigate how local hydrological conditions influence 1) tree alpha diversity, 2) the community-weighted wood density mean (CWM-wd) – a proxy for hydraulic resistance and 3) tree species composition. We find that the effect of local hydrological conditions on tree diversity depends on climate, being more evident in wetter forests, where diversity increases towards locations with well-drained soils. CWM-wd increased towards better drained soils in Southern and Western Amazonia. Tree species composition changed along local soil hydrological gradients in Central-Eastern, Western and Southern Amazonia, and those changes were correlated with changes in the mean wood density of plots. Our results suggest that local hydrological gradients filter species, influencing the diversity and composition of Amazonian forests. Overall, this study shows that the effect of local hydrological conditions is pervasive, extending over wide Amazonian regions, and reinforces the importance of accounting for local topography and hydrology to better understand the likely response and resilience of forests to increased frequency of extreme climate events and rising temperatures.
Published: 2022

7. IDF21-0030 More than a third of SACA countries (South and Central America) do not have coverage of insulin, supplies and lab exams

Author: Barone, T.U.M., Villarroel, D., Xavier, L., Patrício, B., Ripoli, P., Chaluppe, M., De Luca, P., Harnik, S., and Giampaoli, V.
Published: 2022
Full Text: View/download PDF

8. BIENESTAR MATERNO DURANTE EL PROCESO DE PARTO: DESARROLLO Y APLICACIÓN DE UNA ESCALA DE MEDICIÓN

Author: Claudia Uribe T, Aixa Contreras M, Luis Villarroel D, Soledad Rivera M, Paulina Bravo V, and Mariela Cornejo A
Subjects: Bienestar materno, satisfacción de usuaria, parto, escala, puntaje, Maternal wellbeing, patient satisfaction, childbirth, scale, score, Gynecology and obstetrics, RG1-991
Abstract: Objetivo: Diseñar y validar un instrumento objetivo y autoaplicable para evaluar el nivel de bienestar que experimentan las mujeres en situación de parto. Método: Se consideró la combinación de las metodologías cualitativas y cuantitativas. A través de grupos de focos y entrevistas individuales, se recogió la percepción subjetiva del bienestar materno, sus indicadores y sus distintas dimensiones. En la tapa cuantitativa, a través de un diseño correlacional de corte transversal, se validó la escala y se exploró el nivel de bienestar materno en 303 mujeres puérperas que tuvieron su parto en un hospital público del área sur oriente de Santiago. Resultados: La Escala de Bienestar Materno en Situación de Parto BMSP, exploró el bienestar materno en tres niveles: óptimo, adecuado y malestar; más de un 60% de las mujeres reportaron un nivel de bienestar adecuado u óptimo, referido al "buen trato", asociándose significativamente al tipo de parto y la paridad de la mujeres. El puntaje de bienestar no se relaciona con la hora del turno, con la situación de pareja, ni con el nivel educacional y socioeconómico de las mujeres. La dimensión que mejor se correlaciona con el bienestar corresponde al cuidado profesional de calidad, la que reportó mejor puntaje como subescala. Conclusión: El instrumento permitió evaluar el bienestar materno durante el partoObjective: To design and test an objective and self-administered instrument in order to evalúate the wellbeing of women during childbirth. Method: Combinations of qualitative and quantitative methodologies were considered. Using focus groups and individual interviews, the subjective perception of maternal wellbeing in its distinct dimensions was explored. In the quantitative phase, using a cross sectional correlational design, the scale was tested and validated in 303 women post-partum in a public hospital in the south west section of Santiago, and at the same time the level of wellbeing of women in childbirth was explored. Results: The Scale of Maternal Wellbeing in Childbirth, explored maternal wellbeing in three levéis: optimal, adequate and unpleasant; more than 60% of the women reported their level of wellbeing as adequate or optimal, significantly associated with the type of delivery and parity of the women. The score of wellbeing was not associated with time of shift, partner status, level of education, or socio-economic status of the women. The dimensión that significantly correlated with the wellbeing score was the quality of professional care, this one reported de highest score as a subscale. Conclusión: The instrument allow to evalúate the maternal wellbeing during childbirth
Published: 2008

9. Biased-corrected richness estimates for the Amazonian tree flora

Author: ter Steege, H., Prado, P.I., Lima, R.A.F., Pos, E., de Souza Coelho, L., de Andrade Lima Filho, D., Salomão, R.P., Amaral, I.L., de Almeida Matos, F.D., Castilho, C.V., Phillips, O.L., Guevara, J.E., de Jesus Veiga Carim, M., Cárdenas López, D., Magnusson, W.E., Wittmann, F., Martins, M.P., Sabatier, D., Irume, M.V., da Silva Guimarães, J.R., Molino, J.-F., Bánki, O.S., Piedade, M.T.F., Pitman, N.C.A., Ramos, J.F., Monteagudo Mendoza, A., Venticinque, E.M., Luize, B.G., Núñez Vargas, P., Silva, T.S.F., de Leão Novo, E.M.M., Reis, N.F.C., Terborgh, J., Manzatto, A.G., Casula, K.R., Honorio Coronado, E.N., Montero, J.C., Duque, A., Costa, F.R.C., Castaño Arboleda, N., Schöngart, J., Zartman, C.E., Killeen, T.J., Marimon, B.S., Marimon-Junior, B.H., Vasquez, R., Mostacedo, B., Demarchi, L.O., Feldpausch, T.R., Engel, J., Petronelli, P., Baraloto, C., Assis, R.L., Castellanos, H., Simon, M.F., de Medeiros, M.B., Quaresma, A., Laurance, S.G.W., Rincón, L.M., Andrade, A., Sousa, T.R., Camargo, J.L., Schietti, J., Laurance, W.F., de Queiroz, H.L., Nascimento, H.E.M., Lopes, M.A., de Sousa Farias, E., Magalhães, J.L.L., Brienen, R., Aymard C, G.A., Revilla, J.D.C., Vieira, I.C.G., Cintra, B.B.L., Stevenson, P.R., Feitosa, Y.O., Duivenvoorden, J.F., Mogollón, H.F., Araujo-Murakami, A., Ferreira, L.V., Lozada, J.R., Comiskey, J.A., de Toledo, J.J., Damasco, G., Dávila, N., Lopes, A., García-Villacorta, R., Draper, F., Vicentini, A., Cornejo Valverde, F., Lloyd, J., Gomes, V.H.F., Neill, D., Alonso, A., Dallmeier, F., de Souza, F.C., Gribel, R., Arroyo, L., Carvalho, F.A., de Aguiar, D.P.P., do Amaral, D.D., Pansonato, M.P., Feeley, K.J., Berenguer, E., Fine, P.V.A., Guedes, M.C., Barlow, J., Ferreira, J., Villa, B., Peñuela Mora, M.C., Jimenez, E.M., Licona, J.C., Cerón, C., Thomas, R., Maas, P., Silveira, M., Henkel, T.W., Stropp, J., Paredes, M.R., Dexter, K.G., Daly, D., Baker, T.R., Huamantupa-Chuquimaco, I., Milliken, W., Pennington, T., Tello, J.S., Pena, J.L.M., Peres, C.A., Klitgaard, B., Fuentes, A., Silman, M.R., Di Fiore, A., von Hildebrand, P., Chave, J., van Andel, T.R., Hilário, R.R., Phillips, J.F., Rivas-Torres, G., Noronha, J.C., Prieto, A., Gonzales, T., de Sá Carpanedo, R., Gonzales, G.P.G., Gómez, R.Z., de Jesus Rodrigues, D., Zent, E.L., Ruschel, A.R., Vos, V.A., Fonty, É., Junqueira, A.B., Doza, H.P.D., Hoffman, B., Zent, S., Barbosa, E.M., Malhi, Y., de Matos Bonates, L.C., de Andrade Miranda, I.P., Silva, N., Barbosa, F.R., Vela, C.I.A., Pinto, L.F.M., Rudas, A., Albuquerque, B.W., Umaña, M.N., Carrero Márquez, Y.A., van der Heijden, G., Young, K.R., Tirado, M., Correa, D.F., Sierra, R., Costa, J.B.P., Rocha, M., Vilanova Torre, E., Wang, O., Oliveira, A.A., Kalamandeen, M., Vriesendorp, C., Ramirez-Angulo, H., Holmgren, M., Nascimento, M.T., Galbraith, D., Flores, B.M., Scudeller, V.V., Cano, A., Ahuite Reategui, M.A., Mesones, I., Baider, C., Mendoza, C., Zagt, R., Urrego Giraldo, L.E., Ferreira, C., Villarroel, D., Linares-Palomino, R., Farfan-Rios, W., Casas, L.F., Cárdenas, S., Balslev, H., Torres-Lezama, A., Alexiades, M.N., Garcia-Cabrera, K., Valenzuela Gamarra, L., Valderrama Sandoval, E.H., Ramirez Arevalo, F., Hernandez, L., Sampaio, A.F., Pansini, S., Palacios Cuenca, W., de Oliveira, E.A., Pauletto, D., Levesley, A., Melgaço, K., Pickavance, G., ter Steege, H., Prado, P.I., Lima, R.A.F., Pos, E., de Souza Coelho, L., de Andrade Lima Filho, D., Salomão, R.P., Amaral, I.L., de Almeida Matos, F.D., Castilho, C.V., Phillips, O.L., Guevara, J.E., de Jesus Veiga Carim, M., Cárdenas López, D., Magnusson, W.E., Wittmann, F., Martins, M.P., Sabatier, D., Irume, M.V., da Silva Guimarães, J.R., Molino, J.-F., Bánki, O.S., Piedade, M.T.F., Pitman, N.C.A., Ramos, J.F., Monteagudo Mendoza, A., Venticinque, E.M., Luize, B.G., Núñez Vargas, P., Silva, T.S.F., de Leão Novo, E.M.M., Reis, N.F.C., Terborgh, J., Manzatto, A.G., Casula, K.R., Honorio Coronado, E.N., Montero, J.C., Duque, A., Costa, F.R.C., Castaño Arboleda, N., Schöngart, J., Zartman, C.E., Killeen, T.J., Marimon, B.S., Marimon-Junior, B.H., Vasquez, R., Mostacedo, B., Demarchi, L.O., Feldpausch, T.R., Engel, J., Petronelli, P., Baraloto, C., Assis, R.L., Castellanos, H., Simon, M.F., de Medeiros, M.B., Quaresma, A., Laurance, S.G.W., Rincón, L.M., Andrade, A., Sousa, T.R., Camargo, J.L., Schietti, J., Laurance, W.F., de Queiroz, H.L., Nascimento, H.E.M., Lopes, M.A., de Sousa Farias, E., Magalhães, J.L.L., Brienen, R., Aymard C, G.A., Revilla, J.D.C., Vieira, I.C.G., Cintra, B.B.L., Stevenson, P.R., Feitosa, Y.O., Duivenvoorden, J.F., Mogollón, H.F., Araujo-Murakami, A., Ferreira, L.V., Lozada, J.R., Comiskey, J.A., de Toledo, J.J., Damasco, G., Dávila, N., Lopes, A., García-Villacorta, R., Draper, F., Vicentini, A., Cornejo Valverde, F., Lloyd, J., Gomes, V.H.F., Neill, D., Alonso, A., Dallmeier, F., de Souza, F.C., Gribel, R., Arroyo, L., Carvalho, F.A., de Aguiar, D.P.P., do Amaral, D.D., Pansonato, M.P., Feeley, K.J., Berenguer, E., Fine, P.V.A., Guedes, M.C., Barlow, J., Ferreira, J., Villa, B., Peñuela Mora, M.C., Jimenez, E.M., Licona, J.C., Cerón, C., Thomas, R., Maas, P., Silveira, M., Henkel, T.W., Stropp, J., Paredes, M.R., Dexter, K.G., Daly, D., Baker, T.R., Huamantupa-Chuquimaco, I., Milliken, W., Pennington, T., Tello, J.S., Pena, J.L.M., Peres, C.A., Klitgaard, B., Fuentes, A., Silman, M.R., Di Fiore, A., von Hildebrand, P., Chave, J., van Andel, T.R., Hilário, R.R., Phillips, J.F., Rivas-Torres, G., Noronha, J.C., Prieto, A., Gonzales, T., de Sá Carpanedo, R., Gonzales, G.P.G., Gómez, R.Z., de Jesus Rodrigues, D., Zent, E.L., Ruschel, A.R., Vos, V.A., Fonty, É., Junqueira, A.B., Doza, H.P.D., Hoffman, B., Zent, S., Barbosa, E.M., Malhi, Y., de Matos Bonates, L.C., de Andrade Miranda, I.P., Silva, N., Barbosa, F.R., Vela, C.I.A., Pinto, L.F.M., Rudas, A., Albuquerque, B.W., Umaña, M.N., Carrero Márquez, Y.A., van der Heijden, G., Young, K.R., Tirado, M., Correa, D.F., Sierra, R., Costa, J.B.P., Rocha, M., Vilanova Torre, E., Wang, O., Oliveira, A.A., Kalamandeen, M., Vriesendorp, C., Ramirez-Angulo, H., Holmgren, M., Nascimento, M.T., Galbraith, D., Flores, B.M., Scudeller, V.V., Cano, A., Ahuite Reategui, M.A., Mesones, I., Baider, C., Mendoza, C., Zagt, R., Urrego Giraldo, L.E., Ferreira, C., Villarroel, D., Linares-Palomino, R., Farfan-Rios, W., Casas, L.F., Cárdenas, S., Balslev, H., Torres-Lezama, A., Alexiades, M.N., Garcia-Cabrera, K., Valenzuela Gamarra, L., Valderrama Sandoval, E.H., Ramirez Arevalo, F., Hernandez, L., Sampaio, A.F., Pansini, S., Palacios Cuenca, W., de Oliveira, E.A., Pauletto, D., Levesley, A., Melgaço, K., and Pickavance, G.
Abstract: Amazonian forests are extraordinarily diverse, but the estimated species richness is very much debated. Here, we apply an ensemble of parametric estimators and a novel technique that includes conspecific spatial aggregation to an extended database of forest plots with up-to-date taxonomy. We show that the species abundance distribution of Amazonia is best approximated by a logseries with aggregated individuals, where aggregation increases with rarity. By averaging several methods to estimate total richness, we confirm that over 15,000 tree species are expected to occur in Amazonia. We also show that using ten times the number of plots would result in an increase to just ~50% of those 15,000 estimated species. To get a more complete sample of all tree species, rigorous field campaigns may be needed but the number of trees in Amazonia will remain an estimate for years to come. © 2020, The Author(s).
Published: 2020

10. Synchrotron radiation and symmetries

Author: Rivera, R. and Villarroel, D.
Subjects: Synchrotron radiation -- Analysis, Symmetry -- Analysis, Energy economics -- Analysis, Electromagnetic fields -- Analysis, Physics
Abstract: The total power of radiation emitted by a monoenergetic electron in circular orbit is derived by calculating the instantaneous energy flux of the electron field across the surfaces of spheres and tori that enclose the orbit. These surfaces are such that the positions of the electron at different times are indistinguishable with respect to them, which in turn permits the choice of special spheres and tori that greatly simplify the calculations. The total power of radiation of an electron is usually derived in textbooks with the help of the relativistic formalism. But for the particular motion in a synchrotron, the total power of radiation is obtained here working in the ordinary three-dimensional physical space, where the calculations are conceptually easier to follow than in Minskowski space, especially for students who are taking a first course of electrodynamics.
Published: 2000

11. Rarity of monodominance in hyperdiverse Amazonian forests

Author: Ter Steege, H., Henkel, T.W., Helal, N., Marimon, B.S., Marimon-Junior, B.H., Huth, A., Groeneveld, J., Sabatier, D., Coelho, L.S., Filho, D.A.L., Salomão, R.P., Amaral, I.L., Matos, F.D.A., Castilho, C.V., Phillips, O.L., Guevara, J.E., Carim, M.J.V., Cárdenas López, D., Magnusson, W.E., Wittmann, F., Irume, M.V., Martins, M.P., Guimarães, J.R.D.S., Molino, J.-F., Bánki, O.S., Piedade, M.T.F., Pitman, N.C.A., Mendoza, A.M., Ramos, J.F., Luize, B.G., Moraes de Leão Novo, E.M., Núñez Vargas, P., Silva, T.S.F., Venticinque, E.M., Manzatto, A.G., Reis, N.F.C., Terborgh, J., Casula, K.R., Honorio Coronado, E.N., Montero, J.C., Feldpausch, T.R., Duque, A., Costa, F.R.C., Arboleda, N.C., Schöngart, J., Killeen, T.J., Vasquez, R., Mostacedo, B., Demarchi, L.O., Assis, R.L., Baraloto, C., Engel, J., Petronelli, P., Castellanos, H., de Medeiros, M.B., Quaresma, A., Simon, M.F., Andrade, A., Camargo, J.L., Laurance, S.G.W., Laurance, W.F., Rincón, L.M., Schietti, J., Sousa, T.R., de Sousa Farias, E., Lopes, M.A., Magalhães, J.L.L., Mendonça Nascimento, H.E., Lima de Queiroz, H., Aymard C, G.A., Brienen, R., Revilla, J.D.C., Vieira, I.C.G., Cintra, B.B.L., Stevenson, P.R., Feitosa, Y.O., Duivenvoorden, J.F., Mogollón, H.F., Araujo-Murakami, A., Ferreira, L.V., Lozada, J.R., Comiskey, J.A., de Toledo, J.J., Damasco, G., Dávila, N., Draper, F., García-Villacorta, R., Lopes, A., Vicentini, A., Alonso, A., Dallmeier, F., Gomes, V.H.F., Lloyd, J., Neill, D., de Aguiar, D.P.P., Arroyo, L., Carvalho, F.A., de Souza, F.C., do Amaral, D.D., Feeley, K.J., Gribel, R., Pansonato, M.P., Barlow, J., Berenguer, E., Ferreira, J., Fine, P.V.A., Guedes, M.C., Jimenez, E.M., Licona, J.C., Peñuela Mora, M.C., Villa, B., Cerón, C., Maas, P., Silveira, M., Stropp, J., Thomas, R., Baker, T.R., Daly, D., Dexter, K.G., Huamantupa-Chuquimaco, I., Milliken, W., Pennington, T., Ríos Paredes, M., Fuentes, A., Klitgaard, B., Pena, J.L.M., Peres, C.A., Silman, M.R., Tello, J.S., Chave, J., Cornejo Valverde, F., Di Fiore, A., Hilário, R.R., Phillips, J.F., Rivas-Torres, G., van Andel, T.R., von Hildebrand, P., Noronha, J.C., Barbosa, E.M., Barbosa, F.R., de Matos Bonates, L.C., Carpanedo, R.S., Dávila Doza, H.P., Fonty, É., GómeZárate Z, R., Gonzales, T., Gallardo Gonzales, G.P., Hoffman, B., Junqueira, A.B., Malhi, Y., Miranda, I.P.A., Pinto, L.F.M., Prieto, A., Rodrigues, D.J., Rudas, A., Ruschel, A.R., Silva, N., Vela, C.I.A., Vos, V.A., Zent, E.L., Zent, S., Weiss Albuquerque, B., Cano, A., Carrero Márquez, Y.A., Correa, D.F., Costa, J.B.P., Flores, B.M., Galbraith, D., Holmgren, M., Kalamandeen, M., Nascimento, M.T., Oliveira, A.A., Ramirez-Angulo, H., Rocha, M., Scudeller, V.V., Sierra, R., Tirado, M., Umaña Medina, M.N., van der Heijden, G., Vilanova Torre, E., Vriesendorp, C., Wang, O., Young, K.R., Ahuite Reategui, M.A., Baider, C., Balslev, H., Cárdenas, S., Casas, L.F., Farfan-Rios, W., Ferreira, C., Linares-Palomino, R., Mendoza, C., Mesones, I., Torres-Lezama, A., Giraldo, L.E.U., Villarroel, D., Zagt, R., Alexiades, M.N., de Oliveira, E.A., Garcia-Cabrera, K., Hernandez, L., Palacios Cuenca, W., Pansini, S., Pauletto, D., Ramirez Arevalo, F., Sampaio, A.F., Sandoval, E.H.V., Valenzuela Gamarra, L., Levesley, A., Pickavance, G., Melgaço, K., Ter Steege, H., Henkel, T.W., Helal, N., Marimon, B.S., Marimon-Junior, B.H., Huth, A., Groeneveld, J., Sabatier, D., Coelho, L.S., Filho, D.A.L., Salomão, R.P., Amaral, I.L., Matos, F.D.A., Castilho, C.V., Phillips, O.L., Guevara, J.E., Carim, M.J.V., Cárdenas López, D., Magnusson, W.E., Wittmann, F., Irume, M.V., Martins, M.P., Guimarães, J.R.D.S., Molino, J.-F., Bánki, O.S., Piedade, M.T.F., Pitman, N.C.A., Mendoza, A.M., Ramos, J.F., Luize, B.G., Moraes de Leão Novo, E.M., Núñez Vargas, P., Silva, T.S.F., Venticinque, E.M., Manzatto, A.G., Reis, N.F.C., Terborgh, J., Casula, K.R., Honorio Coronado, E.N., Montero, J.C., Feldpausch, T.R., Duque, A., Costa, F.R.C., Arboleda, N.C., Schöngart, J., Killeen, T.J., Vasquez, R., Mostacedo, B., Demarchi, L.O., Assis, R.L., Baraloto, C., Engel, J., Petronelli, P., Castellanos, H., de Medeiros, M.B., Quaresma, A., Simon, M.F., Andrade, A., Camargo, J.L., Laurance, S.G.W., Laurance, W.F., Rincón, L.M., Schietti, J., Sousa, T.R., de Sousa Farias, E., Lopes, M.A., Magalhães, J.L.L., Mendonça Nascimento, H.E., Lima de Queiroz, H., Aymard C, G.A., Brienen, R., Revilla, J.D.C., Vieira, I.C.G., Cintra, B.B.L., Stevenson, P.R., Feitosa, Y.O., Duivenvoorden, J.F., Mogollón, H.F., Araujo-Murakami, A., Ferreira, L.V., Lozada, J.R., Comiskey, J.A., de Toledo, J.J., Damasco, G., Dávila, N., Draper, F., García-Villacorta, R., Lopes, A., Vicentini, A., Alonso, A., Dallmeier, F., Gomes, V.H.F., Lloyd, J., Neill, D., de Aguiar, D.P.P., Arroyo, L., Carvalho, F.A., de Souza, F.C., do Amaral, D.D., Feeley, K.J., Gribel, R., Pansonato, M.P., Barlow, J., Berenguer, E., Ferreira, J., Fine, P.V.A., Guedes, M.C., Jimenez, E.M., Licona, J.C., Peñuela Mora, M.C., Villa, B., Cerón, C., Maas, P., Silveira, M., Stropp, J., Thomas, R., Baker, T.R., Daly, D., Dexter, K.G., Huamantupa-Chuquimaco, I., Milliken, W., Pennington, T., Ríos Paredes, M., Fuentes, A., Klitgaard, B., Pena, J.L.M., Peres, C.A., Silman, M.R., Tello, J.S., Chave, J., Cornejo Valverde, F., Di Fiore, A., Hilário, R.R., Phillips, J.F., Rivas-Torres, G., van Andel, T.R., von Hildebrand, P., Noronha, J.C., Barbosa, E.M., Barbosa, F.R., de Matos Bonates, L.C., Carpanedo, R.S., Dávila Doza, H.P., Fonty, É., GómeZárate Z, R., Gonzales, T., Gallardo Gonzales, G.P., Hoffman, B., Junqueira, A.B., Malhi, Y., Miranda, I.P.A., Pinto, L.F.M., Prieto, A., Rodrigues, D.J., Rudas, A., Ruschel, A.R., Silva, N., Vela, C.I.A., Vos, V.A., Zent, E.L., Zent, S., Weiss Albuquerque, B., Cano, A., Carrero Márquez, Y.A., Correa, D.F., Costa, J.B.P., Flores, B.M., Galbraith, D., Holmgren, M., Kalamandeen, M., Nascimento, M.T., Oliveira, A.A., Ramirez-Angulo, H., Rocha, M., Scudeller, V.V., Sierra, R., Tirado, M., Umaña Medina, M.N., van der Heijden, G., Vilanova Torre, E., Vriesendorp, C., Wang, O., Young, K.R., Ahuite Reategui, M.A., Baider, C., Balslev, H., Cárdenas, S., Casas, L.F., Farfan-Rios, W., Ferreira, C., Linares-Palomino, R., Mendoza, C., Mesones, I., Torres-Lezama, A., Giraldo, L.E.U., Villarroel, D., Zagt, R., Alexiades, M.N., de Oliveira, E.A., Garcia-Cabrera, K., Hernandez, L., Palacios Cuenca, W., Pansini, S., Pauletto, D., Ramirez Arevalo, F., Sampaio, A.F., Sandoval, E.H.V., Valenzuela Gamarra, L., Levesley, A., Pickavance, G., and Melgaço, K.
Abstract: Tropical forests are known for their high diversity. Yet, forest patches do occur in the tropics where a single tree species is dominant. Such “monodominant” forests are known from all of the main tropical regions. For Amazonia, we sampled the occurrence of monodominance in a massive, basin-wide database of forest-inventory plots from the Amazon Tree Diversity Network (ATDN). Utilizing a simple defining metric of at least half of the trees ≥ 10 cm diameter belonging to one species, we found only a few occurrences of monodominance in Amazonia, and the phenomenon was not significantly linked to previously hypothesized life history traits such wood density, seed mass, ectomycorrhizal associations, or Rhizobium nodulation. In our analysis, coppicing (the formation of sprouts at the base of the tree or on roots) was the only trait significantly linked to monodominance. While at specific locales coppicing or ectomycorrhizal associations may confer a considerable advantage to a tree species and lead to its monodominance, very few species have these traits. Mining of the ATDN dataset suggests that monodominance is quite rare in Amazonia, and may be linked primarily to edaphic factors.
Published: 2019

12. Response of the Fall Armyworm and Other Lepidopterous Pests of Bolivia to Synthetic Pheromones

Author: Ward, C. R., Mitchell, E. R., Sparks, A. N., Serrate, H., and Villarroel, D.
Published: 1980
Full Text: View/download PDF

13. Pod and Seed Mycoflora on Transgenic and Conventional Soybean [Glycine max (L.) Merrill] cultivars in Mississippi

Author: Villarroel, D. A., Baird, R. E., Trevathan, L. E., Watson, C. E., and Scruggs, M. L.
Published: 2004
Full Text: View/download PDF

14. Design of a furnace for refining copper prior to fusion

Author: Villarroel, D.
Published: 2000
Full Text: View/download PDF

15. Process for refining copper in solid state

Author: Villarroel, D.
Published: 1999
Full Text: View/download PDF

16. Efecto del contacto piel con piel sobre la presencia de síntomas depresivos post parto en mujeres de bajo riesgo obstétrico

Author: Claudia Uribe T, Angelina Dois C, Luis Villarroel D, and Camila Lucchini R
Subjects: medicine.medical_specialty, Preventive strategy, Obstetric risk, integumentary system, contacto piel con piel, Obstetrics, business.industry, Incidence (epidemiology), Breastfeeding, síntomas depresivos, Early initiation, Depressive symptomatology, post parto, Escala de Depresión de Edimburgo, Pediatrics, Perinatology and Child Health, medicine, business, Depressive symptoms, Depression (differential diagnoses)
Abstract: Antecedentes: La depresión postparto es un problema de alta prevalencia que impacta en la vinculación afectiva de la madre con su hijo(a). El contacto piel con piel se define como el contacto del recién nacido seco y desnudo, en posición prona sobre el pecho desnudo de su madre, cubierto por su espalda con una manta tibia, inmediatamente ocurrido el parto durante al menos una hora. Objetivo: Examinar la relación entre el contacto piel con piel y la incidencia de síntomas depresivos en mujeres con embarazos de bajo riesgo obstétrico. Pacientes y Método: Estudio analítico prospectivo de 393 puérperas de bajo riesgo obstétrico que evaluó sintomatología depresiva puerperal y su asociación con variables bio-sociodemográficas y características del contacto piel con piel como variable en estudio. Los datos se recolectaron a través de un cuestionario a las 24-48 h postparto y un seguimiento telefónico para pesquisar síntomas depresivos a través de la Escala de Depresión de Edimburgo a las 8 sem postparto. Resultados: Se reporta una incidencia de 29% de síntomas depresivos. El análisis mostró que el contacto piel con piel y el inicio precoz del amamantamiento están asociado significativamente con la ausencia de sintomatología depresiva postparto. Conclusión: El contacto piel con piel fue la única variable en este estudio capaz de explicar la ausencia de síntomas depresivos en mujeres que cursaron embarazos de bajo riesgo obstétrico. Se sugiere su implementación como estrategia preventiva.
Published: 2013

17. Estimating the global conservation status of over 15,000 Amazonian tree species

Author: Steege, HT, Pitman, NCA, Killeen, TJ, Laurance, WF, Peres, CA, Guevara, JE, Salomão, RP, Castilho, CV, Amaral, IL, Dionízia de Almeida Matos, F, de Souza Coelho, L, Magnusson, WE, Phillips, OLB, de Andrade Lima Filho, D, de Jesus Veiga Carim, M, Victória Irume, M, Martins, MP, Molino, J-F, Sabatier, D, Wittmann, F, Lopez, DC, da Silva Guimarães, JR, Monteagudo Mendoza, A, Vargas, PN, Manzatto, AG, Farias Costa Reis, N, Terborgh, J, Casula, KR, Montero, JC, Feldpausch, TR, Honorio Coronado, EN, Duque Montoya, AJ, Zartman, ZE, Mostacedo, B, Vasquez, R, Assis, RL, Brilhante Medeiros, M, Fragomeni Simon, M, Andrade, A, Camargo, JL, Laurance, SGW, Mendonça Nascimento, HE, Marimon, BS, Marimon Jr, B-H, Costa F, Targhetta, N, Guimarães Vieira, IC, Brienen, R, Castellanos, H, Duivenvoorden, JF, Mogollón, HF, Fernandez Piedade, MT, Aymard, GA, Comiskey, JA, Damasco, G, Dávila, N, García-Villacorta, R, Stevenson Diaz, PR, Vincentini, A, Emilio, T, Levis, C, Schietti, J, Souza, P, Alonso, A, Dallmeier, F, Valle Ferreira, L, Neill, D, Araujo-Murakami, A, Arroyo, L, Antunes Carvalho, F, Coelho Souza, F, Dantas do Amaral, D, Gribel, R, Garcia Luize, B, Petrati Pansonato, M, Venticinque, E, Fine, P, Toldeo, M, Baraloto, C, Cerón, C, Engel, J, Henkel, TW, Jimenez, EM, Maas, P, Peñuela Mora, MC, Petronelli, P, Cardenas Revilla, JD, Silveira, M, Stropp, J, Thomas-Caesar, R, Baker, TR, Daly, D, Ríos Paredes, M, Ferreira da Silva, N, Fuentes, A, Møller Jørgensen, P, Schöngart, J, Silman, MR, Castaño Arboleda, N, Ladvocat Cintra, B, Cornejo Valverde, F, Di Fiore, A, Fernando Phillips, J, van Andel, TR, von Hildebrand, P, Marques Barbosa, E, de Matos Bonates, LC, de Castro, D, de Sousa Farias, E, Gonzales, T, Guillaumet, J-L, Hoffman, B, Malhi, Y, de Andrade Miranda, IP, Prieto, M, Rudas, A, Ruschell, AR, Silva, N, Vela, CIA, Vos, VA, Zent, EL, Zent, S, Cano, A, Trindade Nascimento, M, Oliveira, AA, Ramirez-Angulo, H, Ferreira Ramos, J, Sierra, R, Tirado, M, Umaña Medina, MN, van der Heijden, G, Vilanova Torre, E, Vriesendorp, C, Wang, O, Young, KR, Baider, C, Balslev, H, de Castro, N, Farfan-Rios, W, Ferreira, C, Mendoza, C, Mesonos, I, Torres-Lezama, A, Urrego Giraldo, LE, Villarroel, D, Zagt, R, Alexiades, MN, Garcia-Cabrera, K, Hernandez, L, Huamantupa-Chuquimaco, I, Milliken, W, Palacios Cuenca, W, Pansini, S, Pauletto, D, Ramirez Arevalo, F, Sampaio, AF, and Valderrama Sandoval, EH
Abstract: Estimates of extinction risk for Amazonian plant and animal species are rare, and not often incorporated into land-use policy and conservation planning. Here we overlay spatial distribution models with historical and projected deforestation to show that at least 40% and up to 64% of all Amazonian tree species are likely to qualify as globally threatened under IUCN Red List criteria. If confirmed, these results would increase the number of threatened plant species on Earth by 22%. We further show that the trends observed in Amazonia apply to trees throughout the tropics, and predict that most of the world's >40,000 tropical tree species currently qualify as globally threatened. A gap analysis suggests that existing Amazonian protected areas and indigenous territories will protect viable populations of most threatened species if those areas suffer no further degradation, highlighting the key roles that protected areas, indigenous peoples, and improved governance can play in preventing large-scale extinctions in the tropics in this century.
Published: 2015

18. Riesgo de delirium durante la hospitalización en personas mayores: desarrollo y validación de un modelo de predicción clínica

Author: Matías González T, Gabriel Martínez F, Maricarmen Andrade A, Jorge Calderón P, Marcela Carrasco G, and Luis Villarroel D
Subjects: Gerontology, Pediatrics, medicine.medical_specialty, Inpatients, Multivariate analysis, business.industry, Delirium, General Medicine, Underlying disease, Cohort, Assessment methods, mental disorders, Medicine, medicine.symptom, business, Prospective cohort study, Validation cohort, Confusion, Aged
Abstract: Background: Delirium is a prevalent problem among older patients and it is frequently underdiagnosed. Aim: To develop and validate a clinical predictive model to identify patients at high risk of delirium. Material and Methods: Two consecutive prospective cohort studies were used to develop and validate the model. The development cohort included 542 consecutive medical inpatients, 65 years or older. The validation cohort included 85 comparable patients. A predictive score was constructed with a multivariate analysis, using variables independently associated with delirium and subsequently tested in the new cohort. Patients were assessed within the first 48 hours of admission, and every 48 hours thereafter, using the Confusion Assessment Method to diagnose delirium, evaluating also the severity of underlying disease, comorbidities, functionality, and laboratory data. Results: Delirium occurred in 192 patients (35.4%) of the development cohort and was independently associated with age and functional status assessed using the Barthel Index. With these two variables, the predictive score for delirium was developed and tested rendering an area under the receiver operating characteristic (ROC) of 0.80 (confidence intervals 0.77-0.85). Cut-off points were chosen to establish low, intermediate, and high-risk groups for delirium. According to these cut-off points, delirium frequencies in the development cohort were 8%, 23%, and 69%, and in the validation cohort 5%, 34%, and 66%, respectively (c² p < 0.05). Conclusions: This simple predictive model based on age and functional status may be a useful tool for identifying older patients risking delirium.
Published: 2014

19. Adaptación y validación de la escala de bienestar materno en situación de parto: segunda versión para escenarios de asistencia integral

Author: Aixa Conteras M, Luis Villarroel D, and Claudia Uribe T
Subjects: scale, Bienestar materno, parto integral, integral childbirth, Maternal wellbeing, Obstetrics and Gynecology, instrument, escala, instrumento
Abstract: Antecedentes: La literatura actual ha mostrado escasa información respecto del bienestar materno durante el proceso de parto. Objetivo: Mejorar la exigencia de la Escala Bienestar materno en Situación de Parto (BMSP1), para ser utilizada en modalidades integrales de asistencia, se adapta la versión inicial y se valida estadísticamente. Método: Se utiliza una muestra no probabilística de 223 puérperas de bajo riesgo, que participan como grupo control, previo a la implementación del Centro de Asistencia Integral del Parto en un hospital público de Santiago. A la escala BMSP1 se agregan 10 afirmaciones alineadas con las políticas de parto integral y, posteriormente, se le aplica dos pruebas psicométricas que permiten evaluar su consistencia interna y reagrupar los ítems en nuevas dimensiones-subescalas. Resultados: Se obtiene un instrumento válido y fiable, apto para recoger la percepción de bienestar en modalidades de asistencia integral del parto. Se compone de 7 dimensiones que agrupan a 47 afirmaciones de bienestar o malestar. La primera, referida al cuidado relacional de calidad, concentra la mayor cantidad de afirmaciones. El resto de las dimensiones agrupan, cada una, a lo menos 4 ítems de bienestar o malestar, y se refieren a las condiciones ambientales, a la percepción de contacto precoz con el hijo, al acompañamiento familiar, a las medidas de autocuidado y confort, al cuidado oportuno y respetuoso; asimismo, la que tiene relación con la despersonalización del cuidado. Conclusión: La escala BMSP2 es aplicable para evaluar bienestar materno en escenarios de parto con las exigencias de un proceso integral, de calidad y seguridad. Background: Current literature has shown scant information on maternal well-being during the birth process. Objective: With the purpose of applying methods of integral childbirth assistance to improve the standards of Maternal Welfare Scale (BMSP1), the initial version of has been adapted and subjected to statistical validation. Method: We have used a non-probabilistic sample of two hundred and twenty three low risk women during their puerperium period, who took part as a base controlled group, before the implementation of the Integral Childbirth Assistance Centre in a public hospital in Santiago. Ten statements that were in line with integral childbirth policies were added to the BMSP1; and two psychometric tests, which allowed evaluation of internal consistency and construct validity. Results: The attainment of a valid and reliable instrument for evaluating the perception of wellbeing in integral assistance methods in childbirth. It has seven dimensions that can be grouped into 47 measures of wellbeing or discomfort. The first, which contains a larger number of statements or measures, refers to quality relational care. The remaining dimensions are collections of at least four items of wellbeing or discomfort each, and focus on environmental conditions, early contact with the child, family support, self-care methods, adequate and respectful attention, as well as the correlation with impersonalized care. Conclusion: The BMSP2 scale can be used to evaluate maternal welfare in childbirth scenarios with the standards of an integral, secure and high quality process.
Published: 2014

20. Proposición de nuevas ecuaciones para calcular valores espirométricos de referencia en población chilena adulta: Sociedad Chilena de Enfermedades Respiratorias (SER)

Author: Gutiérrez C, Mónica, Valdivia C, Gonzalo, Villarroel D, Luis, Contreras T, Gustavo, Cartagena S, Claudia, and Lisboa B, Carmen
Subjects: Spirometry, Respiratory function tests, Reference values
Abstract: Background: To correctly interpret spirometric results, reference values should come from the same population. Current spirometric reference equations have been under scrutiny due to deficiencies to fit adequately for Chilean population, specially, for those aged over 65 years old. Aim: To develop new spirometric reference values for Chilean adults, based on national studies in which spirometries were performed in healthy non-smoker adults. Material and Methods: A standardized database of spirometric values was developed combining spirometric data collected from five population-based studies, in which healthy nonsmoker adults participated. Spirometries from 448 males aged 19 to 84 years and from 726 females aged 19 to 94 years, obtained according to guidelines from the American Thoracic and European Respiratory Societies, were analyzed. Using multiple regression models, which included height, gender, and age, the theoretical value and inferior limits of normality were calculated for 1st second (FEV1), forced vital capacity (FVC), FEV1/FVC, and forced mid-expiratory flow rate (FEF25-75). Results: Reference values and lower limits of normality (LLN) were constructed for Chilean adults of both genders. The new proposed set of equations had a better fit, when compared with the current reference values used in Chile. Conclusions: The new spirometric references values derived from this study, fit better than currently used ones. Therefore, they should be used as new references values for Chilean adults.
Published: 2014

21. Proposición de nuevas ecuaciones para calcular valores espirométricos de referencia en población chilena adulta: Sociedad Chilena de Enfermedades Respiratorias (SER)

Author: Carmen Lisboa B, Claudia Cartagena S, Luis Villarroel D, Gonzalo Valdivia C, Gustavo Contreras T, and Mónica Gutiérrez C
Subjects: education.field_of_study, business.industry, media_common.quotation_subject, Population, General Medicine, Respiratory function tests, Reference values, FEV1/FVC ratio, Spirometry, Medicine, business, education, Normality, Demography, media_common
Abstract: Background: To correctly interpret spirometric results, reference values should come from the same population. Current spirometric reference equations have been under scrutiny due to deficiencies to fit adequately for Chilean population, specially, for those aged over 65 years old. Aim: To develop new spirometric reference values for Chilean adults, based on national studies in which spirometries were performed in healthy non-smoker adults. Material and Methods: A standardized database of spirometric values was developed combining spirometric data collected from five population-based studies, in which healthy nonsmoker adults participated. Spirometries from 448 males aged 19 to 84 years and from 726 females aged 19 to 94 years, obtained according to guidelines from the American Thoracic and European Respiratory Societies, were analyzed. Using multiple regression models, which included height, gender, and age, the theoretical value and inferior limits of normality were calculated for 1st second (FEV1), forced vital capacity (FVC), FEV1/FVC, and forced mid-expiratory flow rate (FEF25-75). Results: Reference values and lower limits of normality (LLN) were constructed for Chilean adults of both genders. The new proposed set of equations had a better fit, when compared with the current reference values used in Chile. Conclusions: The new spirometric references values derived from this study, fit better than currently used ones. Therefore, they should be used as new references values for Chilean adults.
Published: 2014

22. Edaphic, structural and physiological contrasts across Amazon Basin forest-savanna ecotones suggest a role for potassium as a key modulator of tropical woody vegetation structure and function

Author: Lloyd, J., Domingues, T.F., Schrodt, F., Ishida, F.Y., Feldpausch, T.R., Saiz, G., Quesada, C.A., Schwarz, M., Torello-Raventos, M., Gilpin, M., Marimon, B.S., Marimon-Junior, B.H., Ratter, J.A., Grace, J., Nardoto, G.B., Veenendaal, E., Arroyo, L., Villarroel, D., Killeen, T.J., Steininger, M., Phillips, O.L., Lloyd, J., Domingues, T.F., Schrodt, F., Ishida, F.Y., Feldpausch, T.R., Saiz, G., Quesada, C.A., Schwarz, M., Torello-Raventos, M., Gilpin, M., Marimon, B.S., Marimon-Junior, B.H., Ratter, J.A., Grace, J., Nardoto, G.B., Veenendaal, E., Arroyo, L., Villarroel, D., Killeen, T.J., Steininger, M., and Phillips, O.L.
Abstract: Sampling along a precipitation gradient in tropical South America extending from ca. 0.8 to 2.0 m ag-1, savanna soils had consistently lower exchangeable cation concentrations and higher C/N ratios than nearby forest plots. These soil differences were also reflected in canopy averaged leaf traits with savanna trees typically having higher leaf mass per unit area but lower mass-based nitrogen (Nm) and potassium (Km). Both Nm and Km also increased with declining mean annual precipitation (PA), but most area-based leaf traits such as leaf photosynthetic capacity showed no systematic variation with PA or vegetation type. Despite this invariance, when taken in conjunction with other measures such as mean canopy height, area-based soil exchangeable potassium content, [K]sa , proved to be an excellent predictor of several photosynthetic properties (including 13C isotope discrimination). Moreover, when considered in a multivariate context with PA and soil plant available water storage capacity (θP) as covariates, [K]sa also proved to be an excellent predictor of stand-level canopy area, providing drastically improved fits as compared to models considering just PA and/or θP. Neither calcium, nor magnesium, nor soil pH could substitute for potassium when tested as alternative model predictors (ΔAIC > 10). Nor for any model could simple soil texture metrics such as sand or clay content substitute for either [K]sa or θP. Taken in conjunction with recent work in Africa and the forests of the Amazon Basin, this suggests-in combination with some newly conceptualised interacting effects of PA and θP also presented here-a critical role for potassium as a modulator of tropical vegetation structure and function.
Published: 2015

23. Structural, physiognomic and above-ground biomass variation in savanna-forest transition zones on three continents - how different are co-occurring savanna and forest formations?

Author: Veenendaal, E.M., Torello-Raventos, M., Feldpausch, T.R., Domingues, T.F., Gerard, F., Schrodt, F., Saiz, G., Quesada, C.A., Djagbletey, G., Ford, A., Kemp, J., Marimon, B.S., Marimon-Junior, B.H., Lenza, E., Ratter, J.A., Maracahipes, L., Sasaki, D., Sonke, B., Zapfack, L., Villarroel, D., Schwarz, M., Ishida, F. Yoko, Gilpin, M., Nardoto, G.B., Affum-Baffoe, K., Arroyo, L., Bloomfield, K., Ceca, G., Compaore, H., Davies, K., Diallo, A., Fyllas, N.M., Gignoux, J., Hien, F., Johnson, M., Mougin, E., Hiernaux, P., Killeen, T., Metcalfe, D., Miranda, H.S., Steininger, M., Sykora, K., Bird, M.I., Grace, J., Lewis, S., Phillips, O.L., Lloyd, J., Veenendaal, E.M., Torello-Raventos, M., Feldpausch, T.R., Domingues, T.F., Gerard, F., Schrodt, F., Saiz, G., Quesada, C.A., Djagbletey, G., Ford, A., Kemp, J., Marimon, B.S., Marimon-Junior, B.H., Lenza, E., Ratter, J.A., Maracahipes, L., Sasaki, D., Sonke, B., Zapfack, L., Villarroel, D., Schwarz, M., Ishida, F. Yoko, Gilpin, M., Nardoto, G.B., Affum-Baffoe, K., Arroyo, L., Bloomfield, K., Ceca, G., Compaore, H., Davies, K., Diallo, A., Fyllas, N.M., Gignoux, J., Hien, F., Johnson, M., Mougin, E., Hiernaux, P., Killeen, T., Metcalfe, D., Miranda, H.S., Steininger, M., Sykora, K., Bird, M.I., Grace, J., Lewis, S., Phillips, O.L., and Lloyd, J.
Abstract: Through interpretations of remote-sensing data and/or theoretical propositions, the idea that forest and savanna represent “alternative stable states” is gaining increasing acceptance. Filling an observational gap, we present detailed stratified floristic and structural analyses for forest and savanna stands located mostly within zones of transition (where both vegetation types occur in close proximity) in Africa, South America and Australia. Woody plant leaf area index variation was related to tree canopy cover in a similar way for both savanna and forest with substantial overlap between the two vegetation types. As total woody plant canopy cover increased, so did the relative contribution of middle and lower strata of woody vegetation. Herbaceous layer cover declined as woody cover increased. This pattern of understorey grasses and herbs progressively replaced by shrubs as the canopy closes over was found for both savannah and forests and on all continents. Thus, once subordinate woody canopy layers are taken into account, a less marked transition in woody plant cover across the savanna–forest species discontinuum is observed compared to that inferred when trees of a basal diameter > 0:1m are considered in isolation. This is especially the case for shrub-dominated savannas and in taller savannas approaching canopy closure. An increased contribution of forest species to the total subordinate cover is also observed as savanna stand canopy closure occurs. Despite similarities in canopy-cover haracteristics, woody vegetation in Africa and Australia attained greater heights and stored a greater amount of above-ground biomass than in South America. Up to three times as much aboveground biomass is stored in forests compared to savannas under equivalent climatic conditions. Savanna–forest transition zones were also found to typically occur at higher precipitation regimes for South America than for Africa. Nevertheless,consistent across all three continents coexistence was
Published: 2015

24. [New spirometric reference equations for healthy Chilean adults]

Author: Mónica, Gutiérrez C, Gonzalo, Valdivia C, Luis, Villarroel D, Gustavo, Contreras T, Claudia, Cartagena S, and Carmen, Lisboa B
Subjects: Adult, Aged, 80 and over, Male, Forced Expiratory Flow Rates, Middle Aged, Young Adult, Reference Values, Spirometry, Forced Expiratory Volume, Humans, Regression Analysis, Female, Chile, Aged
Abstract: To correctly interpret spirometric results, reference values should come from the same population. Current spirometric reference equations have been under scrutiny due to deficiencies to fit adequately for Chilean population, specially, for those aged over 65 years old.To develop new spirometric reference values for Chilean adults, based on national studies in which spirometries were performed in healthy non-smoker adults.A standardized database of spirometric values was developed combining spirometric data collected from five population-based studies, in which healthy nonsmoker adults participated. Spirometries from 448 males aged 19 to 84 years and from 726 females aged 19 to 94 years, obtained according to guidelines from the American Thoracic and European Respiratory Societies, were analyzed. Using multiple regression models, which included height, gender, and age, the theoretical value and inferior limits of normality were calculated for 1st second (FEV1), forced vital capacity (FVC), FEV1/FVC, and forced mid-expiratory flow rate (FEF25-75).Reference values and lower limits of normality (LLN) were constructed for Chilean adults of both genders. The new proposed set of equations had a better fit, when compared with the current reference values used in Chile.The new spirometric references values derived from this study, fit better than currently used ones. Therefore, they should be used as new references values for Chilean adults.
Published: 2013

25. Efecto del contacto piel con piel sobre la presencia de síntomas depresivos post parto en mujeres de bajo riesgo obstétrico

Author: DOIS C, ANGELINA, LUCCHINI R, CAMILA, VILLARROEL D, LUIS, and URIBE T, CLAUDIA
Subjects: Edinburgh Depression Scale, post parto, Escala de Depresión de Edimburgo, contacto piel con piel, Depressive symptoms, postpartum, skin-to-skin contact, síntomas depresivos
Abstract: Antecedentes: La depresión postparto es un problema de alta prevalencia que impacta en la vinculación afectiva de la madre con su hijo(a). El contacto piel con piel se define como el contacto del recién nacido seco y desnudo, en posición prona sobre el pecho desnudo de su madre, cubierto por su espalda con una manta tibia, inmediatamente ocurrido el parto durante al menos una hora. Objetivo: Examinar la relación entre el contacto piel con piel y la incidencia de síntomas depresivos en mujeres con embarazos de bajo riesgo obstétrico. Pacientes y Método: Estudio analítico prospectivo de 393 puérperas de bajo riesgo obstétrico que evaluó sintomatología depresiva puerperal y su asociación con variables bio-sociodemográficas y características del contacto piel con piel como variable en estudio. Los datos se recolectaron a través de un cuestionario a las 24-48 h postparto y un seguimiento telefónico para pesquisar síntomas depresivos a través de la Escala de Depresión de Edimburgo a las 8 sem postparto. Resultados: Se reporta una incidencia de 29% de síntomas depresivos. El análisis mostró que el contacto piel con piel y el inicio precoz del amamantamiento están asociado significativamente con la ausencia de sintomatología depresiva postparto. Conclusión: El contacto piel con piel fue la única variable en este estudio capaz de explicar la ausencia de síntomas depresivos en mujeres que cursaron embarazos de bajo riesgo obstétrico. Se sugiere su implementación como estrategia preventiva. Background: Postpartum depression can interfere with bonding between the mother and the child. The skin-to-skin contact is defined as the contact of the newborn, dry and naked, prone on the mother's bare chest and with a warm blanket placed across the infant's back; this contact takes place immediately after delivery, for at least an hour. Objective: To examine the relationship between skin-to-skin contact and the incidence of depressive symptoms in women with low risk pregnancies. Patients and Method: A prospective analytical study was performed in 393 postpartum women with low obstetric risk in order to evaluate the postpartum depressive symptomatology and its association with biodemographic and skin-to-skin contact variables. Data were collected through a questionnaire at 24 to 48 hours postpartum and through telephone follow-up, at 8 weeks postpartum, in order to screen depressive symptoms using the Edinburgh Depression Scale. Results: 29% of women reported depressive symptoms. The analysis showed that skin-to-skin contact and early initiation of breastfeeding are significantly associated with the absence of postpartum depressive symptomatology. Conclusion: Skin-to-skin contact was the only variable in this study that can explain the absence of depressive symptoms in women with low risk pregnancies. Skin-to-skin contact implementation is suggested as a preventive strategy.
Published: 2013

26. Classical electrodynamics of retarded fields and point particles

Author: Teitelboim, C., Villarroel, D., and van Weert, Ch. G.
Published: 1980
Full Text: View/download PDF

27. A class of integral conservation laws in curved space-time

Author: Villarroel, D.
Published: 1975
Full Text: View/download PDF

28. Remark on the Cabibbo-Ferrari two-potential approach to electric and magnetic charges

Author: Cordero, P. and Villarroel, D.
Published: 1977
Full Text: View/download PDF

29. A new two-potential approach for electric and magnetic charges

Author: Villarroel, D.
Published: 1976
Full Text: View/download PDF

30. Cross-section, scattering amplitude and the asymptotic behaviour of the potential

Author: Villarroel, D.
Published: 1970
Full Text: View/download PDF

31. Determinación de péptidos solubles relacionados a mesotelina para la detección precoz del mesotelioma maligno

Author: Solari G, Sandra, Goycolea M, Manuela, Villarroel D, Luis, Urzúa F, Ilse, Beroíza W, Teresa, Ricci B, Francisca, Solovera R, María E, and Clavero R, José M
Subjects: trabajadores expuestos a asbesto, asbestos-exposed workers, screening, péptidos relacionados a mesotelina, Malignant pleural mesothelioma, detección precoz, mesothelin-related peptides, Mesotelioma pleural maligno
Abstract: Resumen Introducción: El Mesotelioma Maligno (MM) es un tumor de las células mesoteliales relacionado a la exposición a asbesto, altamente agresivo, con pobre respuesta al tratamiento y con una sobrevida promedio de 8 meses después del diagnóstico. Sin embargo, nuevos agentes quimioterapéuticos yprotocolos de terapia trimodal han logrado sobrevidas de hasta 40% en etapas iniciales. La detección en sangre periférica de Péptidos Solubles Relacionados a Mesotelina (SMRP) podría ser útil para el diagnóstico precoz de MM. Utilizando el test MESOMARK® para la determinación de SMRP, 53% de los pacientes con MM tenían valores mayores a 1,5 nM mientras que 99% de los controles mostraron valores inferiores. El objetivo delpresente trabajo es evaluar la implementación de este test en Chile y determinar su utilidad para el diagnóstico precoz en MM. Métodos: Medición cuantitativa de SMRP en suero humano por test MESOMARK®. Se realizaron mediciones en forma ciega a 8 trabajadores con exposición a asbesto, a 5 pacientes con MMy a 14 voluntarios sin exposición. Todos los participantes fueron informados del estudio. Resultados: Elpromedio ± desviación estándar de SMRP en el grupo control fue de 0,53 ± 0,4 nM, de 0,89 ± 0,46 nM en los expuestos sin MMy de 10,68 ± 10,28 nM en el grupo con MM; encontrándose una diferencia estadísticamente significativa entre los valores de estos tres grupos (p = 0,02). En el grupo con MM, 3 pacientes tuvieron concentraciones mucho mayores a 1,5 nM (17,27 nM; DS 6,95) y 2 valores normales (0,79 nM; DS 0,32). Utilizando un valor de 1,5 nM como punto de corte, la sensibilidad fue de 60% y la especificidad de 100%. Conclusiones: La medición de SMRP permitió diferenciar a los pacientes con MM, presentando 3 de ellos concentraciones muy elevadas. La sensibilidad y especificidad encontrada es similar con datos previamente reportados. De confirmarse estos resultados en estudios con mayor número de pacientes este test podría ser implementado para el diagnóstico precoz de MM. Introduction: Malignant Pleural Mesothelioma (MPM) is a tumor of the mesothelial cells related to asbestos exposure. This malignancy is extremely aggressive, with poor response to different treatment modalities, and it has a mean survival of 8 months since diagnosis. With the introduction of new chemotherapeutic agents and trimodality protocols,five-year survival of 40% in initial stages has been reported. Serum detection of Soluble Mesothelin-related Protein (SMRP) could be used for screening ofMPM. Using the MESOMARK® test, 53% ofMPMpatients had levels greater than 1,5 nM, while 99% of control patients had lower concentrations. The aim of this study is to evaluate the use of this test in Chile and determine its utility for screening ofMPM. Methods: Quantitative blind measurement ofserum SMRP by MESOMARK® test. We studied 3 groups: 8 workers exposed to asbestos, 5 patients with diagnosedMPM and 14 age matched workers without known exposure to asbestos. Participants were informed of the study. Results: Mean ± standard deviation SMRP levels in the control group was 0,53 ± 0,4 nM, 0,89 ± 0,46 nM in patients exposed to asbestos and 10,68 ± 10,28 nM in MPMpatients. Differences between the groups were statistically significant (p = 0,02). In the MPMgroup, 3 patients were found to have SMRP levels greater than 1,5 nM (17,27 nM; SD 6,95) and 2 patients normal values (0,79 nM; SD 0,32). Using a cut-off value of 1,5 nM, sensitivity of the test was 60% and specificity was 100%. Conclusions: Detection of SMRP levels allowed to identify patients with MPM, three of whom had very high concentrations. The sensitivity and specificity found is similar to that previously reported. If our results are confirmed in greater studies, SMRP detection could be usedfor screening ofMPM.
Published: 2012

32. Determinación de péptidos solubles relacionados a mesotelina para la detección precoz del mesotelioma maligno

Author: Sandra Solari G, María E Solovera R, Ilse Urzúa F, Francisca Ricci B, José M Clavero R, Luis Villarroel D, Teresa Beroíza W, and Manuela Goycoolea M
Subjects: trabajadores expuestos a asbesto, péptidos relacionados a mesotelina, General Medicine, detección precoz, Mesotelioma pleural maligno
Abstract: Resumen Introduccion: El Mesotelioma Maligno (MM) es un tumor de las celulas mesoteliales relacionado a la exposicion a asbesto, altamente agresivo, con pobre respuesta al tratamiento y con una sobrevida promedio de 8 meses despues del diagnostico. Sin embargo, nuevos agentes quimioterapeuticos yprotocolos de terapia trimodal han logrado sobrevidas de hasta 40% en etapas iniciales. La deteccion en sangre periferica de Peptidos Solubles Relacionados a Mesotelina (SMRP) podria ser util para el diagnostico precoz de MM. Utilizando el test MESOMARK® para la determinacion de SMRP, 53% de los pacientes con MM tenian valores mayores a 1,5 nM mientras que 99% de los controles mostraron valores inferiores. El objetivo delpresente trabajo es evaluar la implementacion de este test en Chile y determinar su utilidad para el diagnostico precoz en MM. Metodos: Medicion cuantitativa de SMRP en suero humano por test MESOMARK®. Se realizaron mediciones en forma ciega a 8 trabajadores con exposicion a asbesto, a 5 pacientes con MMy a 14 voluntarios sin exposicion. Todos los participantes fueron informados del estudio. Resultados: Elpromedio ± desviacion estandar de SMRP en el grupo control fue de 0,53 ± 0,4 nM, de 0,89 ± 0,46 nM en los expuestos sin MMy de 10,68 ± 10,28 nM en el grupo con MM; encontrandose una diferencia estadisticamente significativa entre los valores de estos tres grupos (p = 0,02). En el grupo con MM, 3 pacientes tuvieron concentraciones mucho mayores a 1,5 nM (17,27 nM; DS 6,95) y 2 valores normales (0,79 nM; DS 0,32). Utilizando un valor de 1,5 nM como punto de corte, la sensibilidad fue de 60% y la especificidad de 100%. Conclusiones: La medicion de SMRP permitio diferenciar a los pacientes con MM, presentando 3 de ellos concentraciones muy elevadas. La sensibilidad y especificidad encontrada es similar con datos previamente reportados. De confirmarse estos resultados en estudios con mayor numero de pacientes este test podria ser implementado para el diagnostico precoz de MM.
Published: 2012

33. Edaphic, structural and physiological contrasts across Amazon Basin forest–savanna ecotones suggest a role for potassium as a key modulator of tropical woody vegetation structure and function

Author: Lloyd, J., primary, Domingues, T. F., additional, Schrodt, F., additional, Ishida, F. Y., additional, Feldpausch, T. R., additional, Saiz, G., additional, Quesada, C. A., additional, Schwarz, M., additional, Torello-Raventos, M., additional, Gilpin, M., additional, Marimon, B. S., additional, Marimon-Junior, B. H., additional, Ratter, J. A., additional, Grace, J., additional, Nardoto, G. B., additional, Veenendaal, E., additional, Arroyo, L., additional, Villarroel, D., additional, Killeen, T. J., additional, Steininger, M., additional, and Phillips, O. L., additional
Published: 2015
Full Text: View/download PDF

34. Supplementary material to "Edaphic, structural and physiological contrasts across Amazon Basin forest-savanna ecotones suggest a role for potassium as a key modulator of tropical woody vegetation structure and function"

Author: Lloyd, J., primary, Domingues, T. F., additional, Schrodt, F., additional, Ishida, F. Y., additional, Feldpausch, T. R., additional, Saiz, G., additional, Quesada, C. A., additional, Schwarz, M., additional, Torello-Raventos, M., additional, Gilpin, M., additional, Marimon, B. S., additional, Marimon-Junior, B. H., additional, Ratter, J. A., additional, Grace, J., additional, Nardoto, G. B., additional, Veenendaal, E., additional, Arroyo, L., additional, Villarroel, D., additional, Killeen, T. J., additional, Steininger, M., additional, and Phillips, O. L., additional
Published: 2015
Full Text: View/download PDF

35. Structural, physiognomic and above-ground biomass variation in savanna–forest transition zones on three continents – how different are co-occurring savanna and forest formations?

Author: Veenendaal, E. M., primary, Torello-Raventos, M., additional, Feldpausch, T. R., additional, Domingues, T. F., additional, Gerard, F., additional, Schrodt, F., additional, Saiz, G., additional, Quesada, C. A., additional, Djagbletey, G., additional, Ford, A., additional, Kemp, J., additional, Marimon, B. S., additional, Marimon-Junior, B. H., additional, Lenza, E., additional, Ratter, J. A., additional, Maracahipes, L., additional, Sasaki, D., additional, Sonké, B., additional, Zapfack, L., additional, Villarroel, D., additional, Schwarz, M., additional, Yoko Ishida, F., additional, Gilpin, M., additional, Nardoto, G. B., additional, Affum-Baffoe, K., additional, Arroyo, L., additional, Bloomfield, K., additional, Ceca, G., additional, Compaore, H., additional, Davies, K., additional, Diallo, A., additional, Fyllas, N. M., additional, Gignoux, J., additional, Hien, F., additional, Johnson, M., additional, Mougin, E., additional, Hiernaux, P., additional, Killeen, T., additional, Metcalfe, D., additional, Miranda, H. S., additional, Steininger, M., additional, Sykora, K., additional, Bird, M. I., additional, Grace, J., additional, Lewis, S., additional, Phillips, O. L., additional, and Lloyd, J., additional
Published: 2015
Full Text: View/download PDF

36. [Work environment assessment at a medical school]

Author: Ignacio, Sánchez D, Gregorio, Airola G, Tatiana, Cayazzo A, Nuria, Pedrals G, Magdalena, Rodríguez M, and Luis, Villarroel D
Subjects: Adult, Male, Students, Medical, Time Factors, Data Collection, Humans, Female, Middle Aged, Workplace, Schools, Medical, Aged
Abstract: The work environment of an organization has to do with a set of permanent qualities that are experienced by its members.To assess the work environment perception of faculty members of a Medical School in two different periods (2005 and 2007).A standardized survey was applied to faculty members and Department chairs of the academic units of our Medical School. The survey used the Likert scale from 1 to 5 and included 59 items, distributed in 8 factors. Additionally, there were two groups of statements, indicating the priorities for the School and for the academic departments.In the study performed in year 2005, the survey was answered by a total of 399 faculty members (68%) and in year 2007, it was answered by 408 members (68%). The global climate perceptions were 66% and 68% in 2005 and 2007, respectively (ns). Among the dimensions evaluated, communications (p =0,62) and physical conditions (p =0,008) improved in the two years period.The applied instrument was stable and useful to knowing the requirements of the faculty members and for improving the organizational climate.
Published: 2010

37. Clima laboral en una escuela de medicina. Estudio de seguimiento

Author: Magdalena Rodríguez M, Nuria Pedrals G, Ignacio Sánchez D, Tatiana Cayazzo A, Gregorio Airola G, and Luis Villarroel D
Subjects: Medical education, Burnout, professional, Medical school, Educational assessment, General Medicine, Faculty, medical, Psychology, Likert scale
Abstract: Background: The work environment of an organization has to do with a set of permanent qualities that are experienced by its members. Aim: To assess the work environment perception of faculty members of a Medical School in two different periods (2005 and 2007). Material and methods: A standardized survey was applied to faculty members and Department chairs of the academic units of our Medical School. The survey used the Likert scale from 1 to 5 and included 59 items, distributed in 8 factors. Additionally, there were two groups of statements, indicating the priorities for the School and for the academic departments. Results: In the study performed in year 2005, the survey was answered by a total of 399 faculty members (68%) and in year 2007, it was answered by 408 members (68%). The global climate perceptions were 66% and 68% in 2005 and 2007, respectively (ns). Among the dimensions evaluated, communications (p =0,62) and physical conditions (p =0,008) improved in the two years period. Conclusions: The applied instrument was stable and useful to knowing the requirements of the faculty members and for improving the organizational climate.
Published: 2009

38. Clima laboral en una escuela de medicina. Estudio de seguimiento

Author: Sánchez D, Ignacio, Airola G, Gregorio, Cayazzo A, Tatiana, Pedrals G, Nuria, Rodríguez M, Magdalena, and Villarroel D, Luis
Subjects: Burnout, professional, Educational assessment, Faculty, medical
Abstract: Background: The work environment of an organization has to do with a set of permanent qualities that are experienced by its members. Aim: To assess the work environment perception of faculty members of a Medical School in two different periods (2005 and 2007). Material and methods: A standardized survey was applied to faculty members and Department chairs of the academic units of our Medical School. The survey used the Likert scale from 1 to 5 and included 59 items, distributed in 8 factors. Additionally, there were two groups of statements, indicating the priorities for the School and for the academic departments. Results: In the study performed in year 2005, the survey was answered by a total of 399 faculty members (68%) and in year 2007, it was answered by 408 members (68%). The global climate perceptions were 66% and 68% in 2005 and 2007, respectively (ns). Among the dimensions evaluated, communications (p =0,62) and physical conditions (p =0,008) improved in the two years period. Conclusions: The applied instrument was stable and useful to knowing the requirements of the faculty members and for improving the organizational climate.
Published: 2009

39. NUTRIENTS BALANCES IN BEEF CATTLE PRODUCTION SYSTEMS AND THEIR IMPLICATIONS FOR THE ENVIRONMENT

Author: Alfaro, M, Salazar, F. S, Oenema, O, Iraira, S, Teuber, N, Ramirez, L, and Villarroel, D
Subjects: pendiente topográfica, stocking rate, balances de nutrientes, field slope, grazing, nutrient budget, pastoreo, carga animal
Abstract: The main inputs and outputs of nitrogen (N) and phosphorus (P) in soils and swards under typical Southern Chilean conditions were determined between 2004-2005 and 2006-2007 to establish soil and field gate N and P balances under different immediate stocking rates (63 and 191 anim ha-1 d-1) and field slope treatments (4 and 12%). Treatments received 67.5 and 40 kg N and P ha-1 yr-1 as inorganic fertilizer. The main N and P input to the soil balances was N mineralization (304 kg ha-1 yr-1) and inorganic fertilizer (62 and 69% for N and P, respectively). The main output for all treatments was plant uptake (95% and 100% on average for N and P, respectively). The N and P apparent use efficiency was high (>95%). The main N and P input to field gate balances was inorganic fertiliser (>95%>), while animal production had a minor effect on N and P export. The soil balances ranged from -303 up to +58 and from -3 up to +20 kg of N and P ha-1 yr-1. Field N and P gate budgets ranged between -309 up to +58 and from -8 up to +20 kg of N and P ha-1 yr-1, respectively, indicating a potential soil degradation in areas with low nutrient inputs in inorganic fertiliser and an overaccumulation in areas with low dry matter production of the grassland, which in turn can lead to environmental constrains. This should be especially considered for dairy systems, which are more intensively managed. Las principales entradas y salidas de nitrógeno (N) y fósforo (P) en un suelo y pradera típica de las condiciones del sur de Chile fueron determinadas en 2004/05 y 2006/07 para establecer balances de suelo y puerta bajo diferentes cargas animales (63 and 191 anim ha-1 d-1) y pendiente topográfica (4 y 12%). Los tratamientos recibieron 67,5 y 40 kg N y P ha-1 año-1 como fertilizante inorgánico. Las principales entradas de N y P al suelo fueron la mineralización de N (304 kg ha-1 año-1) y la fertilización inorgánica (62 y 69% para N y P, respectivamente). Las principales salidas para todos los tratamientos fue la extracción de las plantas (95% y 100% en promedio para N y P, respectivamente). La eficiencia de uso de N y P fue alta (>95%). El principal ingreso de N y P al balance de puerta fue el fertilizante inorgánico (>95%), mientras que la producción animal tuvo un efecto despreciable sobre la exportación de N y P. Los balances de suelo variaron entre -303 y +58, y desde -3 a +20 kg de N y P ha-1 año-1. Los balances de puerta variaron entre -309 y +58, y entre -8 y +20 kg de N y P ha-1 año-1, respectivamente, indicando un potencial de degradación de suelo en áreas con bajo ingreso de nutrientes en fertilizantes inorgánicos y una sobreacumulación en áreas con bajo nivel de producción de materia seca, lo que puede resultar en restricciones medioambientales. Esto debería considerarse especialmente en sistemas de producción de leche, que son más intensivamente manejados.
Published: 2009

40. AQUA – ein System zur Unterstützung der Qualitätsbewertung medizinischer Informationen in Internet

Author: Villarroel, D, Mayer, MA, Leis, A, Karkaletsis, V, Stamatakis, K, Labsky, M, Cabrera, E, and Pöllä, M
Subjects: ddc: 610, 610 Medical sciences, Medicine
Abstract: Hintergrund Das Internet bietet eine ungeahnte Fülle an Möglichkeiten, Informationen zu veröffentlichen und bei einer großen Leserschaft zu verbreiten. Das gilt auch für Gesundheitsinformationen. Verschiedene Qualitätsinitiativen beschäftigen sich mit der kritischen[for full text, please go to the a.m. URL], Evidenz und Entscheidung: System unter Druck; 10. Jahrestagung des Deutschen Netzwerks Evidenzbasierte Medizin
Published: 2009
Full Text: View/download PDF

41. BIENESTAR MATERNO DURANTE EL PROCESO DE PARTO: DESARROLLO Y APLICACIÓN DE UNA ESCALA DE MEDICIÓN

Author: Paulina Bravo, Soledad Rivera M, Claudia Uribe T, Aixa Contreras M, Mariela Cornejo A, and Luis Villarroel D
Subjects: satisfacción de usuaria, patient satisfaction, Subjective perception, Obstetrics and Gynecology, childbirth, scale, Bienestar materno, parto, Maternal wellbeing, score, escala, Psychology, Humanities, puntaje
Abstract: RESUMEN Objetivo: Disenar y validar un instrumento objetivo y autoaplicable para evaluar el nivel de bienestar que experimentan las mujeres en situacion de parto. Metodo: Se considero la combinacion de las metodologias cualitativas y cuantitativas. A traves de grupos de focos y entrevistas individuales, se recogio la percepcion subjetiva del bienestar materno, sus indicadores y sus distintas dimensiones. En la tapa cuantitativa, a traves de un diseno correlacional de corte transversal, se valido la escala y se exploro el nivel de bienestar materno en 303 mujeres puerperas que tuvieron su parto en un hospital publico del area sur oriente de Santiago. Resultados: La Escala de Bienestar Materno en Situacion de Parto BMSP, exploro el bienestar materno en tres niveles: optimo, adecuado y malestar; mas de un 60% de las mujeres reportaron un nivel de bienestar adecuado u optimo, referido al “buen trato”, asociandose signiﬁcativamente al tipo de parto y la paridad de la mujeres. El puntaje de bienestar no se relaciona con la hora del turno, con la situacion de pareja, ni con el nivel educacional y socioeconomico de las mujeres. La dimension que mejor se correla-ciona con el bienestar corresponde al cuidado profesional de calidad, la que reporto mejor puntaje como subescala. Conclusion: El instrumento permitio evaluar el bienestar materno durante el parto.PALABRAS CLAVES: Bienestar materno, satisfaccion de usuaria, parto, escala, puntajeSUMMARY Objective: To design and test an objective and self-administered instrument in order to evaluate the wellbe-ing of women during childbirth. Method: Combinations of qualitative and quantitative methodologies were considered. Using focus groups and individual interviews, the subjective perception of maternal wellbeing in its distinct dimensions was explored. In the quantitative phase, using a cross sectional correlational design, the scale was tested and validated in 303 women post-partum in a public hospital in the south west section of Santiago, and at the same time the level of wellbeing of women in childbirth was explored. Results: The Scale of Maternal Wellbeing in Childbirth, explored maternal wellbeing in three levels: optimal, adequate and unpleasant; more than 60% of the women reported their level of wellbeing as adequate or optimal, signiﬁcantly associated with the type of delivery and parity of the women. The score of wellbeing was not associated with time of shift, partner status, level of education, or socio-economic status of the women. The dimension that signiﬁcantly correlated with the wellbeing score was the quality of professional care, this one reported de highest score as a subscale. Conclusion: The instrument allow to evaluate the maternal wellbeing during childbirth. KEY WORDS: Maternal wellbeing, patient satisfaction, childbirth, scale, score
Published: 2008

42. Contributors

Author: Agyei, Alfred K., primary, Aragone, C., additional, Backhouse, Nigel, additional, Bacry, H., additional, Beckers, J., additional, Berenson, Rhoda, additional, Biedenharn, L.C., additional, Birman, Joseph L., additional, Boyer, Charles P., additional, Bracken, A.J., additional, Burdet, G., additional, Chalbaud, E., additional, Cizek, J., additional, Combe, Ph., additional, Dirl, R., additional, Gal-Ezer, E., additional, Gazeau, J.P., additional, Gulshani, P., additional, Gürsey, Feza, additional, Haba, Zbigniew, additional, Harkavy, Allan A., additional, Harnad, J.P., additional, Hässelbarth, W., additional, Helgason, Sigurdur, additional, Hongoh, M., additional, Horwitz, L.P., additional, llamed, Yehiel, additional, Jakobsen, H.P., additional, Janner, A., additional, Janssen, T., additional, Jaspers, M., additional, Kaiser, Gerald, additional, Kerner, Richard, additional, Kibler, Maurice R., additional, Klein, D.J., additional, Kramer, P., additional, Ktorides, C.N., additional, Kumei, Sukeyuki, additional, Laskar, W., additional, Lasocka, Maria, additional, Lax, Peter D., additional, Litvin, D.B., additional, Marathe, Kishore B., additional, Marmo, G., additional, Michel, Louis, additional, Miller, Willard, additional, Mirman, R., additional, Mishra, A.K., additional, Niederer, U., additional, Olszewski, Jan, additional, Opechowski, W., additional, Perrin, M., additional, Perroud, M., additional, Pettitt, R.B., additional, Plebanski, Jerzy F., additional, Pommaret, J.F., additional, Rabin, Y., additional, Rao, Srinivasa, K., additional, Robinson, Ivor, additional, Rodriguez, R., additional, Rosensteel, G., additional, Rowe, D.J., additional, Roy, Ghislain, additional, Ruch, E., additional, Salamó, S., additional, Saletan, E.J., additional, Sattinger, D.H., additional, Schindler, Susan, additional, Segal, I.E., additional, Seligman, T.H., additional, Singh, M.C., additional, Sirugue, M., additional, Sirugue-Collin, M., additional, Solomon, A.I., additional, Sorba, Paul, additional, Strasburger, Aleksander, additional, Szczyrba, Igor, additional, van Dam, H., additional, Venkatesh, K., additional, Villarroel, D., additional, Vrscay, E.R., additional, Winternitz, P., additional, Wolf, K.B., additional, and Yadegar, J., additional
Published: 1977
Full Text: View/download PDF

43. POINCARÉ GROUP AND MAGNETIC CHARGE

Author: Villarroel, D., primary
Published: 1977
Full Text: View/download PDF

44. Classical electron mass renormalization

Author: Tabensky, R. and Villarroel, D.
Published: 1975
Full Text: View/download PDF

45. A Lienard-Wiechert type of solution in SU(2)

Author: Villarroel, D., Ehlers, J., editor, Hepp, K., editor, Kippenhahn, R., editor, Weidenmüller, H. A., editor, Zittartz, J., editor, Beiglböck, W., editor, Beiglböck, Wolf, editor, Böhm, Arno, editor, and Takasugi, E., editor
Published: 1979
Full Text: View/download PDF

46. Diseño de un índice pronóstico clínico para el manejo de la neumonía del adulto adquirida en la comunidad

Author: Saldías P, Fernando, Farías G, Gonzalo, Villarroel D, Luis, Valdivia C, Gonzalo, Mardónez U, José Miguel, and Díaz F, Alejandro
Subjects: bacterial, Pneumonia, Prognosis, Lung diseases, community acquired
Abstract: Background: Community acquired pneumonia (CAP) severity assessment is crucial. Aim: To develop a practical clinical severity assessment model for stratifying immunocompetent adult patients hospitalized with CAP into different management groups. Patients and methods: During a 24 months period, 455 adult patients (250 male, mean age 69±19 years old) were evaluated. All the relevant clinical information recorded and they were followed during hospital stay until discharge or death. Mortality until 30 days after admission was determined. Results: The mean hospital length of stay was 9.9±9.4 days and 76% had an underlying disease. In hospital mortality was 7.6% and 10.1% at 30 days follow up. Admission prognostic factors associated with high mortality at 30 days follow up were: advanced age, presence of comorbidity, suspicion of aspiration, duration of symptoms 2 days, altered mental status, absence of cough, fever and chills; low blood pressure, tachypnea, hypoxemia and multilobar radiographic pulmonary infiltrates. A clinical prognostic index derived from a logistic regression analysis including five independent variables associated with mortality (confusion, comorbidity, low systolic blood pressure, temperature 20/min), enabled patients to be stratified according to increasing risk of mortality: class 1: 0.9%, class 2: 4.9%, class 3: 14.2%, and class 4: 35.6%. Conclusion: A simple clinical severity assessment tool based on confusion, comorbidity, blood pressure, temperature and respiratory rate could be used to stratify patients with CAP into different risk class categories and management groups (Rev Méd Chile 2004; 132: 1037-46)
Published: 2004

47. Diseño de un índice pronóstico clínico para el manejo de la neumonía del adulto adquirida en la comunidad

Author: Gonzalo Valdivia C, Luis Villarroel D, Fernando Saldías P, Alejandro Díaz F, José Miguel Mardónez U, and Gonzalo Farías G
Subjects: medicine.medical_specialty, business.industry, Pneumonia, General Medicine, Prognosis, Logistic regression, medicine.disease, Comorbidity, Tachypnea, respiratory tract diseases, Hypoxemia, Surgery, Blood pressure, Altered Mental Status, Internal medicine, medicine, Cardiology, bacterial, Chills, medicine.symptom, business, Lung diseases, community acquired, Confusion
Abstract: Background: Community acquired pneumonia (CAP) severity assessment is crucial. Aim: To develop a practical clinical severity assessment model for stratifying immunocompetent adult patients hospitalized with CAP into different management groups. Patients and methods: During a 24 months period, 455 adult patients (250 male, mean age 69±19 years old) were evaluated. All the relevant clinical information recorded and they were followed during hospital stay until discharge or death. Mortality until 30 days after admission was determined. Results: The mean hospital length of stay was 9.9±9.4 days and 76% had an underlying disease. In hospital mortality was 7.6% and 10.1% at 30 days follow up. Admission prognostic factors associated with high mortality at 30 days follow up were: advanced age, presence of comorbidity, suspicion of aspiration, duration of symptoms 2 days, altered mental status, absence of cough, fever and chills; low blood pressure, tachypnea, hypoxemia and multilobar radiographic pulmonary infiltrates. A clinical prognostic index derived from a logistic regression analysis including five independent variables associated with mortality (confusion, comorbidity, low systolic blood pressure, temperature 20/min), enabled patients to be stratified according to increasing risk of mortality: class 1: 0.9%, class 2: 4.9%, class 3: 14.2%, and class 4: 35.6%. Conclusion: A simple clinical severity assessment tool based on confusion, comorbidity, blood pressure, temperature and respiratory rate could be used to stratify patients with CAP into different risk class categories and management groups (Rev Méd Chile 2004; 132: 1037-46)
Published: 2004

48. A Lienard-Wiechert type of solution in SU(2)

Author: Villarroel, D., primary
Full Text: View/download PDF

49. Riesgo de delirium durante la hospitalización en personas mayores: desarrollo y validación de un modelo de predicción clínica

Author: Carrasco G, Marcela, primary, Villarroel D, Luis, additional, Calderón P, Jorge, additional, Martínez F, Gabriel, additional, Andrade A, Maricarmen, additional, and González T, Matías, additional
Published: 2014
Full Text: View/download PDF

50. Adaptación y validación de la escala de bienestar materno en situación de parto: segunda versión para escenarios de asistencia integral

Author: Uribe T, Claudia, primary, Conteras M, Aixa, additional, and Villarroel D, Luis, additional
Published: 2014
Full Text: View/download PDF

Catalog

Books, media, physical & digital resources

See catalog results

Searchworks

Select search scope, currently: Articles Catalog books, media & more in Jio Institute collections Articles journal articles & other e-resources

Search

Search Constraints

Refine your results

Search Limiters

Topic

Publication Year Range

Language

Publication Type

Journal

Region

Database

Publisher

181 results on '"Villarroel, D."'

Search Results

Catalog

Select search scope, currently: Articles

Catalog

books, media & more in Jio Institute collections

Articles

journal articles & other e-resources