42 results on '"Zweers H"'
Search Results
2. Oral ribose supplementation in dystroglycanopathy: A single case study.
- Author
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Thewissen, R. M. J., Post, M. A., Maas, D. M., Veizaj, R., Wagenaar, I., Alsady, M., Kools, J., Bouman, K., Zweers, H., Meregalli, P. G., van der Kooi, A. J., van Doorn, P. A., Groothuis, J. T., Lefeber, D. J., and Voermans, N. C.
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- 2024
- Full Text
- View/download PDF
3. Successful Weight Loss in Two Adult Patients Diagnosed with Late-Onset Long-Chain Fatty Acid Oxidation Defect
- Author
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Zweers, H., primary, Timmer, C., additional, Rasmussen, E., additional, den Heijer, M., additional, and de Valk, H., additional
- Published
- 2012
- Full Text
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4. Wat is ASSM?
- Author
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Kruizenga, HM, Memelink, Robert, Zweers, H., Hulshof, P., Internal medicine, and AGEM - Endocrinology, metabolism and nutrition
- Published
- 2019
5. Wat is ASSM?
- Author
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Kruizenga, H., Memelink, R., Zweers, H., Hulshof, P., Kruizenga, H., Memelink, R., Zweers, H., and Hulshof, P.
- Abstract
In de nieuwe sarcopeniecriteria wordt de appendiculaire skeletspiermassa gemeten. Wat is dit? En wat is de waarde ervan?
- Published
- 2019
6. International practices in the dietary management of fructose 1-6 biphosphatase deficiency
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Pinto, A. Alfadhel, M. Akroyd, R. Altinok, Y. Atik and Bernabei, S. M. Bernstein, L. Bruni, G. Caine, G. and Cameron, E. Carruthers, R. Cochrane, B. Daly, A. de Boer, F. Delaunay, S. Dianin, A. Dixon, M. Drogari, E. and Dubois, S. Evans, S. Gribben, J. Gugelmo, G. and Heidenborg, C. Hunjan, I. Kok, I. L. Kumru, B. Liguori, A. Mayr, D. Megdad, E. Meyer, U. Oliveira, R. B. and Pal, A. Pozzoli, A. Pretese, R. Rocha, J. C. and Rosenbaum-Fabian, S. Serrano-Nieto, J. Sjoqvist, E. Timmer, C. White, L. van den Hurk, T. van Rijn, M. Zweers, H. and Ziadlou, M. MacDonald, A.
- Abstract
Background: In fructose 1,6 bisphosphatase (FBPase) deficiency, management aims to prevent hypoglycaemia and lactic acidosis by avoiding prolonged fasting, particularly during febrile illness. Although the need for an emergency regimen to avoid metabolic decompensation is well established at times of illness, there is uncertainty about the need for other dietary management strategies such as sucrose or fructose restriction. We assessed international differences in the dietary management of FBPase deficiency. Methods: A cross-sectional questionnaire (13 questions) was emailed to all members of the Society for the Study of Inborn Errors of Metabolism (SSIEM) and a wide database of inherited metabolic disorder dietitians. Results: Thirty-six centres reported the dietary prescriptions of 126 patients with FBPase deficiency. Patients’ age at questionnaire completion was: 1-10y, 46% (n = 58), 11-16y, 21% (n = 27), and >16y, 33% (n = 41). Diagnostic age was: 16y, 2% (n = 2). Seventy-five per cent of centres advocated dietary restrictions. This included restriction of: high sucrose foods only (n = 7 centres, 19%); fruit and sugary foods (n = 4, 11%); fruit, vegetables and sugary foods (n = 13, 36%). Twenty-five per cent of centres (n = 9), advised no dietary restrictions when patients were well. A higher percentage of patients aged >16y rather than 16y, 85% (n = 35/41). Patients classified as having a normal fasting tolerance increased with age from 30% in 1-10y, to 36% in 11-16y, and 58% in >16y, but it was unclear if fasting tolerance was biochemically proven. Twenty centres (56%) routinely prescribed uncooked cornstarch (UCCS) to limit overnight fasting in 47 patients regardless of their actual fasting tolerance (37%). All centres advocated an emergency regimen mainly based on glucose polymer for illness management. Conclusions: Although all patients were prescribed an emergency regimen for illness, use of sucrose and fructose restricted diets with UCCS supplementation varied widely. Restrictions did not relax with age. International guidelines are necessary to help direct future dietary management of FBPase deficiency.
- Published
- 2018
7. International practices in the dietary management of fructose 1-6 biphosphatase deficiency
- Author
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Pinto, A., primary, Alfadhel, M., additional, Akroyd, R., additional, Atik Altınok, Y., additional, Bernabei, S. M., additional, Bernstein, L., additional, Bruni, G., additional, Caine, G., additional, Cameron, E., additional, Carruthers, R., additional, Cochrane, B., additional, Daly, A., additional, de Boer, F., additional, Delaunay, S., additional, Dianin, A., additional, Dixon, M., additional, Drogari, E., additional, Dubois, S., additional, Evans, S., additional, Gribben, J., additional, Gugelmo, G., additional, Heidenborg, C., additional, Hunjan, I., additional, Kok, I. L., additional, Kumru, B., additional, Liguori, A., additional, Mayr, D., additional, Megdad, E., additional, Meyer, U., additional, Oliveira, R. B., additional, Pal, A., additional, Pozzoli, A., additional, Pretese, R., additional, Rocha, J. C., additional, Rosenbaum-Fabian, S., additional, Serrano-Nieto, J., additional, Sjoqvist, E., additional, Timmer, C., additional, White, L., additional, van den Hurk, T., additional, van Rijn, M., additional, Zweers, H., additional, Ziadlou, M., additional, and MacDonald, A., additional
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- 2018
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8. Dietary practices in propionic acidemia: A European survey
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Daly, A., primary, Pinto, A., additional, Evans, S., additional, Almeida, M.F., additional, Assoun, M., additional, Belanger-Quintana, A., additional, Bernabei, S.M., additional, Bollhalder, S., additional, Cassiman, D., additional, Champion, H., additional, Chan, H., additional, Dalmau, J., additional, de Boer, F., additional, de Laet, C., additional, de Meyer, A., additional, Desloovere, A., additional, Dianin, A., additional, Dixon, M., additional, Dokoupil, K., additional, Dubois, S., additional, Eyskens, F., additional, Faria, A., additional, Fasan, I., additional, Favre, E., additional, Feillet, F., additional, Fekete, A., additional, Gallo, G., additional, Gingell, C., additional, Gribben, J., additional, Kaalund Hansen, K., additional, Ter Horst, N.M., additional, Jankowski, C., additional, Janssen-Regelink, R., additional, Jones, I., additional, Jouault, C., additional, Kahrs, G.E., additional, Kok, I.L., additional, Kowalik, A., additional, Laguerre, C., additional, Le Verge, S., additional, Lilje, R., additional, Maddalon, C., additional, Mayr, D., additional, Meyer, U., additional, Micciche, A., additional, Och, U., additional, Robert, M., additional, Rocha, J.C., additional, Rogozinski, H., additional, Rohde, C., additional, Ross, K., additional, Saruggia, I., additional, Schlune, A., additional, Singleton, K., additional, Sjoqvist, E., additional, Skeath, R., additional, Stolen, L.H., additional, Terry, A., additional, Timmer, C., additional, Tomlinson, L., additional, Tooke, A., additional, Vande Kerckhove, K., additional, van Dam, E., additional, van den Hurk, T., additional, van der Ploeg, L., additional, van Driessche, M., additional, van Rijn, M., additional, van Wegberg, A., additional, Vasconcelos, C., additional, Vestergaard, H., additional, Vitoria, I., additional, Webster, D., additional, White, F.J., additional, White, L., additional, Zweers, H., additional, and MacDonald, A., additional
- Published
- 2017
- Full Text
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9. Soil networks become more connected and take up more carbon as nature restoration progresses
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Morriën, E., Hannula, S.E., Snoek, Basten, Helmsing, N.R., Zweers, H., De Hollander, M., Lujan Soto, Raquel, Bouffaud, M.L., Buée, M., Dimmers, Wim, Duyts, H., Geisen, S., Girlanda, M., Griffiths, R.I., Jørgensen, H-B., Jensen, J., Plassart, Pierre, Redecker, Dirk, Schmelz, R.M., Schmidt, O., Thomson, B.C., Tisserant, Emilie, Uroz, S., Winding, A., Bailey, M.J., Bonkowski, M., Faber, Jack H., Martin, F., Lemanceau, P., De Boer, W., van Veen, Hans, van der Putten, W.H., Morriën, E., Hannula, S.E., Snoek, Basten, Helmsing, N.R., Zweers, H., De Hollander, M., Lujan Soto, Raquel, Bouffaud, M.L., Buée, M., Dimmers, Wim, Duyts, H., Geisen, S., Girlanda, M., Griffiths, R.I., Jørgensen, H-B., Jensen, J., Plassart, Pierre, Redecker, Dirk, Schmelz, R.M., Schmidt, O., Thomson, B.C., Tisserant, Emilie, Uroz, S., Winding, A., Bailey, M.J., Bonkowski, M., Faber, Jack H., Martin, F., Lemanceau, P., De Boer, W., van Veen, Hans, and van der Putten, W.H.
- Abstract
Soil organisms have an important role in aboveground community dynamics and ecosystem functioning in terrestrial ecosystems. However, most studies have considered soil biota as a black box or focussed on specific groups, whereas little is known about entire soil networks. Here we show that during the course of nature restoration on abandoned arable land a compositional shift in soil biota, preceded by tightening of the belowground networks, corresponds with enhanced efficiency of carbon uptake. In mid- and long-term abandoned field soil, carbon uptake by fungi increases without an increase in fungal biomass or shift in bacterial-to-fungal ratio. The implication of our findings is that during nature restoration the efficiency of nutrient cycling and carbon uptake can increase by a shift in fungal composition and/or fungal activity. Therefore, we propose that relationships between soil food web structure and carbon cycling in soils need to be reconsidered
- Published
- 2017
10. Dietary practices in isovaleric acidemia: A European survey
- Author
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Pinto, A., primary, Daly, A., additional, Evans, S., additional, Almeida, M.F., additional, Assoun, M., additional, Belanger-Quintana, A., additional, Bernabei, S., additional, Bollhalder, S., additional, Cassiman, D., additional, Champion, H., additional, Chan, H., additional, Dalmau, J., additional, de Boer, F., additional, de Laet, C., additional, de Meyer, A., additional, Desloovere, A., additional, Dianin, A., additional, Dixon, M., additional, Dokoupil, K., additional, Dubois, S., additional, Eyskens, F., additional, Faria, A., additional, Fasan, I., additional, Favre, E., additional, Feillet, F., additional, Fekete, A., additional, Gallo, G., additional, Gingell, C., additional, Gribben, J., additional, Kaalund-Hansen, K., additional, Horst, N., additional, Jankowski, C., additional, Janssen-Regelink, R., additional, Jones, I., additional, Jouault, C., additional, Kahrs, G.E., additional, Kok, I.L., additional, Kowalik, A., additional, Laguerre, C., additional, Le Verge, S., additional, Lilje, R., additional, Maddalon, C., additional, Mayr, D., additional, Meyer, U., additional, Micciche, A., additional, Robert, M., additional, Rocha, J.C., additional, Rogozinski, H., additional, Rohde, C., additional, Ross, K., additional, Saruggia, I., additional, Schlune, A., additional, Singleton, K., additional, Sjoqvist, E., additional, Stolen, L.H., additional, Terry, A., additional, Timmer, C., additional, Tomlinson, L., additional, Tooke, A., additional, Vande Kerckhove, K., additional, van Dam, E., additional, van den Hurk, T., additional, van der Ploeg, L., additional, van Driessche, M., additional, van Rijn, M., additional, van Teeffelen-Heithoff, A., additional, van Wegberg, A., additional, Vasconcelos, C., additional, Vestergaard, H., additional, Vitoria, I., additional, Webster, D., additional, White, F.J., additional, White, L., additional, Zweers, H., additional, and MacDonald, A., additional
- Published
- 2017
- Full Text
- View/download PDF
11. Microbial small talk: volatiles in fungal-bacterial interactions
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Schmidt, Ruth, Etalo, D.N., de Jager, V.C.L., Gerards, S., Zweers, H., De Boer, W., Garbeva, P.V., Schmidt, Ruth, Etalo, D.N., de Jager, V.C.L., Gerards, S., Zweers, H., De Boer, W., and Garbeva, P.V.
- Abstract
There is increasing evidence that volatile organic compounds (VOCs) play an important role in the interactions between fungi and bacteria, two major groups of soil inhabiting microorganisms. Yet, most of the research has been focused on effects of bacterial volatiles on suppression of plant pathogenic fungi whereas little is known about the responses of bacteria to fungal volatiles. In the current study we performed a metabolomics analysis of volatiles emitted by several fungal and oomycetal soil strains under different nutrient conditions and growth stages. The metabolomics analysis of the tested fungal and oomycetal strains revealed different volatile profiles dependent on the age of the strains and nutrient conditions. Furthermore, we screened the phenotypic responses of soil bacterial strains to volatiles emitted by fungi. Two bacteria, Collimonas pratensis Ter291 and Serratia plymuthica PRI-2C, showed significant changes in their motility, in particular to volatiles emitted by Fusarium culmorum. This fungus produced a unique volatile blend, including several terpenes. Four of these terpenes were selected for further tests to investigate if they influence bacterial motility. Indeed, these terpenes induced or reduced swimming and swarming motility of S. plymuthica PRI-2C and swarming motility of C. pratensis Ter291, partly in a concentration-dependent manner. Overall the results of this work revealed that bacteria are able to sense and respond to fungal volatiles giving further evidence to the suggested importance of volatiles as signaling molecules in fungal–bacterial interactions.
- Published
- 2016
12. Practices in prescribing protein substitutes for PKU in Europe : No uniformity of approach
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Aguiar, A., Ahring, K., Almeida, M. F., Assoun, M., Belanger Quintana, A., Bigot, S., Bihet, G., Malmberg, Karin Blom, Burlina, A., Bushueva, T., Caris, A., Chan, H., Clark, A., Clark, S., Cochrane, B., Corthouts, K., Dalmau, J., Dassy, M., De Meyer, A., Didycz, B., Diels, M., Dokupil, K., Dubois, S., Eftring, K., Ekengren, J., Ellerton, C., Evans, S., Faria, A., Fischer, A., Ford, S., Freisinger, P., Gizewska, M., Gokmen-Ozel, H., Gribben, J., Gunden, F., Heddrich-Ellerbrok, M., Heiber, S., Heidenborg, C., Jankowski, C., Janssen-Regelink, R., Jones, I., Jonkers, C., Joerg-Streller, M., Kaalund-Hansen, K., Kiss, E., Lammardo, A. M., Lang, K., Lier, D., Lilje, R., Lowry, S., Luyten, K., MacDonald, A., Meyer, U., Moor, D., Pal, A., Robert, M., Robertson, L., Rocha, J. C., Rohde, C., Ross, K., Saruhan, S., Sjoqvist, E., Skeath, R., Stoelen, L., Ter Horst, N. M., Terry, A., Timmer, C., Tuncer, N., Vande Kerckhove, K., van der Ploeg, L., van Rijn, M., van Spronsen, F. J., van Teeffelen-Heithoff, A., van Wegberg, A., van Wyk, K., Vasconcelos, C., Vitoria, I., Wildgoose, J., Webster, D., White, F. J., Zweers, H., Aguiar, A., Ahring, K., Almeida, M. F., Assoun, M., Belanger Quintana, A., Bigot, S., Bihet, G., Malmberg, Karin Blom, Burlina, A., Bushueva, T., Caris, A., Chan, H., Clark, A., Clark, S., Cochrane, B., Corthouts, K., Dalmau, J., Dassy, M., De Meyer, A., Didycz, B., Diels, M., Dokupil, K., Dubois, S., Eftring, K., Ekengren, J., Ellerton, C., Evans, S., Faria, A., Fischer, A., Ford, S., Freisinger, P., Gizewska, M., Gokmen-Ozel, H., Gribben, J., Gunden, F., Heddrich-Ellerbrok, M., Heiber, S., Heidenborg, C., Jankowski, C., Janssen-Regelink, R., Jones, I., Jonkers, C., Joerg-Streller, M., Kaalund-Hansen, K., Kiss, E., Lammardo, A. M., Lang, K., Lier, D., Lilje, R., Lowry, S., Luyten, K., MacDonald, A., Meyer, U., Moor, D., Pal, A., Robert, M., Robertson, L., Rocha, J. C., Rohde, C., Ross, K., Saruhan, S., Sjoqvist, E., Skeath, R., Stoelen, L., Ter Horst, N. M., Terry, A., Timmer, C., Tuncer, N., Vande Kerckhove, K., van der Ploeg, L., van Rijn, M., van Spronsen, F. J., van Teeffelen-Heithoff, A., van Wegberg, A., van Wyk, K., Vasconcelos, C., Vitoria, I., Wildgoose, J., Webster, D., White, F. J., and Zweers, H.
- Abstract
Background: There appears little consensus concerning protein requirements in phenylketonuria (PKU). Methods: A questionnaire completed by 63 European and Turkish IMD centres from 18 countries collected data on prescribed total protein intake (natural/intact protein and phenylalanine-free protein substitute [PS]) by age, administration frequency and method, monitoring, and type of protein substitute. Data were analysed by European region using descriptive statistics. Results: The amount of total protein (from PS and natural/intact protein) varied according to the European region. Higher median amounts of total protein were prescribed in infants and children in Northern Europe (n = 24 centres) (infants <1 year, >2-3 g/kg/day; 1-3 years of age, >2-3 g/kg/day; 4-10 years of age, >1.5-2.5 g/kg/day) and Southern Europe (n = 10 centres) (infants <1 year, 2.5 g/kg/day, 1-3 years of age, 2 g/kg/day; 4-10 years of age, 1.5-2 g/kg/day), than by Eastern Europe (n = 4 centres) (infants <1 year, 2.5 g/kg/day, 1-3 years of age, >2-2.5 g/kg/day; 4-10 years of age, >1.5-2 g/kg/day) and with Western Europe (n = 25 centres) giving the least (infants <1 year, >2-2.5 g/kg/day, 1-3 years of age, 1.5-2 g/kg/day; 4-10 years of age, 1-1.5 g/kg/day). Total protein prescription was similar in patients aged >10 years (1-1.5 g/kg/day) and maternal patients (1-1.5 g/kg/day). Conclusions: The amounts of total protein prescribed varied between European countries and appeared to be influenced by geographical region. In PKU, all gave higher than the recommended 2007 WHO/FAO/UNU safe levels of protein intake for the general population.
- Published
- 2015
- Full Text
- View/download PDF
13. How strict is galactose restriction in adults with galactosaemia? International practice
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Adam, Siddig Momin, Akroyd, R., Bernabei, S., Bollhalder, S., Boocock, S., Burlina, A., Coote, T., Corthouts, K., Dalmau, Judith, Dawson, S., Defourny, S., Meyer, A., Desloovere, A., Devlin, Y., Diels, M., Dokoupil, K., Donald, S., Evans, S., Fasan, I., Ferguson, C., Ford, S., Forga, M., Gallo, G., Grünert, S.C., Heddrich-Ellerbrok, M., Heidenborg, C., Jonkers, C.F., Lefebure, K., Luyten, K., MacDonald, A., Meyer, U., Micciche, A., Müller, E., Portnoi, P., Ripley, S., Robert, C.M., Robertson, L.V., Rosenbaum-Fabian, S., Sahm, K., Schultz, Erica S, Singleton, K., Sjöqvist, E., Stoelen, L., Terry, A., Thompson, S., Timmer, C., Vande Kerckhove, K., van den Ploeg, L., Van Driessche, M., van Rijn, M., van Teeffelen-Heithoff, A., Vitoria, I., Voillot, C., Wenz, J., Westbrook, M., Wildgoose, J., Zweers, H., Adam, Siddig Momin, Akroyd, R., Bernabei, S., Bollhalder, S., Boocock, S., Burlina, A., Coote, T., Corthouts, K., Dalmau, Judith, Dawson, S., Defourny, S., Meyer, A., Desloovere, A., Devlin, Y., Diels, M., Dokoupil, K., Donald, S., Evans, S., Fasan, I., Ferguson, C., Ford, S., Forga, M., Gallo, G., Grünert, S.C., Heddrich-Ellerbrok, M., Heidenborg, C., Jonkers, C.F., Lefebure, K., Luyten, K., MacDonald, A., Meyer, U., Micciche, A., Müller, E., Portnoi, P., Ripley, S., Robert, C.M., Robertson, L.V., Rosenbaum-Fabian, S., Sahm, K., Schultz, Erica S, Singleton, K., Sjöqvist, E., Stoelen, L., Terry, A., Thompson, S., Timmer, C., Vande Kerckhove, K., van den Ploeg, L., Van Driessche, M., van Rijn, M., van Teeffelen-Heithoff, A., Vitoria, I., Voillot, C., Wenz, J., Westbrook, M., Wildgoose, J., and Zweers, H.
- Published
- 2015
14. Practices in prescribing protein substitutes for PKU in Europe: No uniformity of approach
- Author
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UCL - (SLuc) Service d'endocrinologie et de nutrition, Aguiar, A., Ahring, K., Almeida, M.F., Assoun, M., Belanger Quintana, A., Bigot, S., Bihet, G., Blom Malmberg, K., Burlina, A., Bushueva, T., Caris, A., Chan, H., Clark, A., Clark, S., Cochrane, B., Corthouts, K., Dalmau, J., Dassy, Martine, De Meyer, A., Didycz, B., Diels, M., Dokupil, K., Dubois, S., Eftring, K., Ekengren, J., Ellerton, C., Evans, S., Faria, A., Fischer, A., Ford, S., Freisinger, P., Gizewska, M., Gokmen-Ozel, H., Gribben, J., Gunden, F., Heddrich-Ellerbrok, M., Heiber, S., Heidenborg, C., Jankowski, C., Janssen-Regelink, R., Jones, I., Jonkers, C., Joerg-Streller, M., Kaalund-Hansen, K., Kiss, E., Lammardo, A.M., Lang, K., Lier, D., Lilje, R., Lowry, S., Luyten, K., MacDonald, A., Meyer, U., Moor, D., Pal, A., Robert, M., Robertson, L., Rocha, J.C., Rohde, C., Ross, K., Saruhan, S., Sjöqvist, E., Skeath, R., Stoelen, L., Ter Horst, N.M., Terry, A., Timmer, C., Tuncer, N., Vande Kerckhove, K., van der Ploeg, L., van Rijn, M., van Spronsen, F.J., van Teeffelen-Heithoff, A., van Wegberg, A., van Wyk, K., Vasconcelos, C., Vitoria, I., Wildgoose, J., Webster, D., White, F.J., Zweers, H., UCL - (SLuc) Service d'endocrinologie et de nutrition, Aguiar, A., Ahring, K., Almeida, M.F., Assoun, M., Belanger Quintana, A., Bigot, S., Bihet, G., Blom Malmberg, K., Burlina, A., Bushueva, T., Caris, A., Chan, H., Clark, A., Clark, S., Cochrane, B., Corthouts, K., Dalmau, J., Dassy, Martine, De Meyer, A., Didycz, B., Diels, M., Dokupil, K., Dubois, S., Eftring, K., Ekengren, J., Ellerton, C., Evans, S., Faria, A., Fischer, A., Ford, S., Freisinger, P., Gizewska, M., Gokmen-Ozel, H., Gribben, J., Gunden, F., Heddrich-Ellerbrok, M., Heiber, S., Heidenborg, C., Jankowski, C., Janssen-Regelink, R., Jones, I., Jonkers, C., Joerg-Streller, M., Kaalund-Hansen, K., Kiss, E., Lammardo, A.M., Lang, K., Lier, D., Lilje, R., Lowry, S., Luyten, K., MacDonald, A., Meyer, U., Moor, D., Pal, A., Robert, M., Robertson, L., Rocha, J.C., Rohde, C., Ross, K., Saruhan, S., Sjöqvist, E., Skeath, R., Stoelen, L., Ter Horst, N.M., Terry, A., Timmer, C., Tuncer, N., Vande Kerckhove, K., van der Ploeg, L., van Rijn, M., van Spronsen, F.J., van Teeffelen-Heithoff, A., van Wegberg, A., van Wyk, K., Vasconcelos, C., Vitoria, I., Wildgoose, J., Webster, D., White, F.J., and Zweers, H.
- Abstract
Background: There appears little consensus concerning protein requirements in phenylketonuria (PKU). Methods: A questionnaire completed by 63 European and Turkish IMD centres from 18 countries collected data on prescribed total protein intake (natural/intact protein and phenylalanine-free protein substitute [PS]) by age, administration frequency and method, monitoring, and type of protein substitute. Data were analysed by European region using descriptive statistics. Results: The amount of total protein (from PS and natural/intact protein) varied according to the European region. Higher median amounts of total protein were prescribed in infants and children in Northern Europe (n. =. 24 centres) (infants <. 1. year, >. 2-3. g/kg/day; 1-3. years of age, >. 2-3. g/kg/day; 4-10. years of age, >. 1.5-2.5. g/kg/day) and Southern Europe (n. =. 10 centres) (infants <. 1. year, 2.5. g/kg/day, 1-3. years of age, 2. g/kg/day; 4-10. years of age, 1.5-2. g/kg/day), than by Eastern Europe (n. =. 4 centres) (infants <. 1. year, 2.5. g/kg/day, 1-3. years of age, >. 2-2.5. g/kg/day; 4-10. years of age, >. 1.5-2. g/kg/day) and with Western Europe (n. =. 25 centres) giving the least (infants <. 1. year, >. 2-2.5. g/kg/day, 1-3. years of age, 1.5-2. g/kg/day; 4-10. years of age, 1-1.5. g/kg/day). Total protein prescription was similar in patients aged >. 10. years (1-1.5. g/kg/day) and maternal patients (1-1.5. g/kg/day). Conclusions: The amounts of total protein prescribed varied between European countries and appeared to be influenced by geographical region. In PKU, all gave higher than the recommended 2007 WHO/FAO/UNU safe levels of protein intake for the general population.
- Published
- 2015
15. Volatiles in inter-specific bacterial interactions
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Tyc, O., Zweers, H., De Boer, W., Garbeva, P.V., Tyc, O., Zweers, H., De Boer, W., and Garbeva, P.V.
- Abstract
The importance of volatile organic compounds for functioning of microbes is receiving increased research attention. However, to date very little is known on how inter-specific bacterial interactions effect volatiles production as most studies have been focused on volatiles produced by monocultures of well described bacterial genera. In this study we aimed to understand how inter-specific bacterial interactions affect the composition, production and activity of volatiles. Four phylogenetically different bacterial species namely: Chryseobacterium, Dyella, Janthinobacterium and Tsukamurella were selected. Earlier results had shown that pairwise combinations of these bacteria induced antimicrobial activity in agar media whereas this was not the case for monocultures. In the current study, we examined if these observations were also reflected by the production of antimicrobial volatiles. Thus, the identity and antimicrobial activity of volatiles produced by the bacteria were determined in monoculture as well in pairwise combinations. Antimicrobial activity of the volatiles was assessed against fungal, oomycetal and bacterial model organisms. Our results revealed that inter-specific bacterial interactions affected volatiles blend composition. Fungi and oomycetes showed high sensitivity to bacterial volatiles whereas the effect of volatiles on bacteria varied between no effects, growth inhibition to growth promotion depending on the volatile blend composition. In total 35 volatile compounds were detected most of which were sulfur-containing compounds. Two commonly produced sulfur-containing volatile compounds (dimethyl disulfide and dimethyl trisulfide) were tested for their effect on three target bacteria. Here we display the importance of inter-specific interactions on bacterial volatiles production and their antimicrobial activities.
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- 2015
16. Practices in prescribing protein substitutes for PKU in Europe: No uniformity of approach
- Author
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Afdeling Dietetiek, Other research (not in main researchprogram), Aguiar, A., Ahring, K., Almeida, M.F., Assoun, M., Belanger Quintana, A., Bigot, S., Bihet, G., Blom Malmberg, K., Burlina, A., Bushueva, T., Caris, A., Chan, H., Clark, Rachael A, Clark, Sue, Cochrane, B., Corthouts, K., Dalmau, Judith, Dassy, M., Meyer, A., Didycz, B., Diels, M., Dokupil, K., Dubois, S., Eftring, K., Ekengren, J., Ellerton, C., Evans, S., Faria, A., Fischer, A., Ford, S., Freisinger, P., Gizewska, M., Gokmen-Ozel, H., Gribben, J., Gunden, F., Heddrich-Ellerbrok, M., Heiber, S., Heidenborg, C., Jankowski, C., Janssen-Regelink, R.G., Jones, C.I., Jonkers, C.F., Joerg-Streller, M., Kaalund-Hansen, K., Kiss, E., Lammardo, A.M., Lang, K., Lier, D., Lilje, R., Lowry, S., Luyten, K., MacDonald, A., Meyer, U., de Moor, J., Pal, A., Robert, C.M., Robertson, L., Rocha, J.C., Rohde, C., Ross, K., Saruhan, S., Sjöqvist, E., Skeath, R., Stoelen, L., ter Horst, N.M., Terry, A., Timmer, C., Tuncer, N., Vande Kerckhove, K., van den Ploeg, L., van Rijn, M., van Spronsen, Francjan J., van Teeffelen-Heithoff, A., van Wegberg, A., van Wyk, K., Vasconcelos, C., Vitoria, I., Wildgoose, J., Webster, D., White, F.J., Zweers, H., Afdeling Dietetiek, Other research (not in main researchprogram), Aguiar, A., Ahring, K., Almeida, M.F., Assoun, M., Belanger Quintana, A., Bigot, S., Bihet, G., Blom Malmberg, K., Burlina, A., Bushueva, T., Caris, A., Chan, H., Clark, Rachael A, Clark, Sue, Cochrane, B., Corthouts, K., Dalmau, Judith, Dassy, M., Meyer, A., Didycz, B., Diels, M., Dokupil, K., Dubois, S., Eftring, K., Ekengren, J., Ellerton, C., Evans, S., Faria, A., Fischer, A., Ford, S., Freisinger, P., Gizewska, M., Gokmen-Ozel, H., Gribben, J., Gunden, F., Heddrich-Ellerbrok, M., Heiber, S., Heidenborg, C., Jankowski, C., Janssen-Regelink, R.G., Jones, C.I., Jonkers, C.F., Joerg-Streller, M., Kaalund-Hansen, K., Kiss, E., Lammardo, A.M., Lang, K., Lier, D., Lilje, R., Lowry, S., Luyten, K., MacDonald, A., Meyer, U., de Moor, J., Pal, A., Robert, C.M., Robertson, L., Rocha, J.C., Rohde, C., Ross, K., Saruhan, S., Sjöqvist, E., Skeath, R., Stoelen, L., ter Horst, N.M., Terry, A., Timmer, C., Tuncer, N., Vande Kerckhove, K., van den Ploeg, L., van Rijn, M., van Spronsen, Francjan J., van Teeffelen-Heithoff, A., van Wegberg, A., van Wyk, K., Vasconcelos, C., Vitoria, I., Wildgoose, J., Webster, D., White, F.J., and Zweers, H.
- Published
- 2015
17. How strict is galactose restriction in adults with galactosaemia? International practice
- Author
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Afdeling Dietetiek, Other research (not in main researchprogram), Adam, Siddig Momin, Akroyd, R., Bernabei, S., Bollhalder, S., Boocock, S., Burlina, A., Coote, T., Corthouts, K., Dalmau, Judith, Dawson, S., Defourny, S., Meyer, A., Desloovere, A., Devlin, Y., Diels, M., Dokoupil, K., Donald, S., Evans, S., Fasan, I., Ferguson, C., Ford, S., Forga, M., Gallo, G., Grünert, S.C., Heddrich-Ellerbrok, M., Heidenborg, C., Jonkers, C.F., Lefebure, K., Luyten, K., MacDonald, A., Meyer, U., Micciche, A., Müller, E., Portnoi, P., Ripley, S., Robert, C.M., Robertson, L.V., Rosenbaum-Fabian, S., Sahm, K., Schultz, Erica S, Singleton, K., Sjöqvist, E., Stoelen, L., Terry, A., Thompson, S., Timmer, C., Vande Kerckhove, K., van den Ploeg, L., Van Driessche, M., van Rijn, M., van Teeffelen-Heithoff, A., Vitoria, I., Voillot, C., Wenz, J., Westbrook, M., Wildgoose, J., Zweers, H., Afdeling Dietetiek, Other research (not in main researchprogram), Adam, Siddig Momin, Akroyd, R., Bernabei, S., Bollhalder, S., Boocock, S., Burlina, A., Coote, T., Corthouts, K., Dalmau, Judith, Dawson, S., Defourny, S., Meyer, A., Desloovere, A., Devlin, Y., Diels, M., Dokoupil, K., Donald, S., Evans, S., Fasan, I., Ferguson, C., Ford, S., Forga, M., Gallo, G., Grünert, S.C., Heddrich-Ellerbrok, M., Heidenborg, C., Jonkers, C.F., Lefebure, K., Luyten, K., MacDonald, A., Meyer, U., Micciche, A., Müller, E., Portnoi, P., Ripley, S., Robert, C.M., Robertson, L.V., Rosenbaum-Fabian, S., Sahm, K., Schultz, Erica S, Singleton, K., Sjöqvist, E., Stoelen, L., Terry, A., Thompson, S., Timmer, C., Vande Kerckhove, K., van den Ploeg, L., Van Driessche, M., van Rijn, M., van Teeffelen-Heithoff, A., Vitoria, I., Voillot, C., Wenz, J., Westbrook, M., Wildgoose, J., and Zweers, H.
- Published
- 2015
18. Volatiles in inter-specific bacterial interactions
- Author
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Tyc, Olaf, Zweers, H., de Boer, W., Garbeva, P., Tyc, Olaf, Zweers, H., de Boer, W., and Garbeva, P.
- Abstract
The importance of volatile organic compounds for functioning of microbes is receiving increased research attention. However, to date very little is known on how inter-specific bacterial interactions effect volatiles production as most studies have been focused on volatiles produced by monocultures of well described bacterial genera. In this study we aimed to understand how inter-specific bacterial interactions affect the composition, production and activity of volatiles. Four phylogenetically different bacterial species namely: Chryseobacterium, Dyella, Janthinobacterium and Tsukamurella were selected. Earlier results had shown that pairwise combinations of these bacteria induced antimicrobial activity in agar media whereas this was not the case for monocultures. In the current study, we examined if these observations were also reflected by the production of antimicrobial volatiles. Thus, the identity and antimicrobial activity of volatiles produced by the bacteria were determined in monoculture as well in pairwise combinations. Antimicrobial activity of the volatiles was assessed against fungal, oomycetal and bacterial model organisms. Our results revealed that inter-specific bacterial interactions affected volatiles blend composition. Fungi and oomycetes showed high sensitivity to bacterial volatiles whereas the effect of volatiles on bacteria varied between no effects, growth inhibition to growth promotion depending on the volatile blend composition. In total 35 volatile compounds were detected most of which were sulfur-containing compounds. Two commonly produced sulfur-containing volatile compounds (dimethyl disulfide and dimethyl trisulfide) were tested for their effect on three target bacteria. Here we display the importance of inter-specific interactions on bacterial volatiles production and their antimicrobial activities.
- Published
- 2015
19. A fragrant neighborhood: Volatile mediated bacterial interactions in soil
- Author
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Schulz-Bohm, K., Zweers, H., de Boer, W., Garbeva, P., Schulz-Bohm, K., Zweers, H., de Boer, W., and Garbeva, P.
- Abstract
There is increasing evidence that volatile organic compounds play essential roles in communication and competition between soil microorganisms. Here we assessed volatile-mediated interactions of a synthetic microbial community in a model system that mimics the natural conditions in the heterogeneous soil environment along the rhizosphere. Phylogenetic different soil bacterial isolates (Burkholderia sp., Dyella sp., Janthinobacterium sp., Pseudomonas sp., and Paenibacillus sp.) were inoculated as mixtures or monoculture in organic-poor, sandy soil containing artificial root exudates and the volatile profile and growth were analyzed. Additionally, a two-compartment system was used to test if volatiles produced by inter-specific interactions in the rhizosphere can stimulate the activity of starving bacteria in the surrounding, nutrient-depleted soil. The obtained results revealed that both microbial interactions and shifts in microbial community composition had a strong effect on the volatile emission. Interestingly, the presence of a slow-growing, low abundant Paenibacillus strain significantly affected the volatile production by the other abundant members of the bacterial community as well as the growth of the interacting strains. Furthermore, volatiles released by mixtures of root-exudates consuming bacteria stimulated the activity and growth of starved bacteria. Besides growth stimulation, also an inhibition in growth was observed for starving bacteria exposed to microbial volatiles. The current work suggests that volatiles produced during microbial interactions in the rhizosphere have a significant long distance effect on microorganisms in the surrounding, nutrient-depleted soil.
- Published
- 2015
20. Investigation of the functional lifetime of TRISOPLASTr in relation to chemical compositions of pore water solutions in barriers
- Author
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Boels, D., te Beest, H., Zweers, H., and Groeneveld, P.
- Subjects
barriers ,cation exchange ,kationenwisseling ,pores ,bodemwaterbeweging ,Alterra - Centre for Water and Climate ,membraanpermeabiliteit ,chemical composition ,landfills ,Alterra - Centrum Bodem ,Wageningen Environmental Research ,stortterreinen ,barrières ,poriën ,Soil Science Centre ,soil conservation ,soil water movement ,permeabiliteit ,membranen ,membrane permeability ,chemische samenstelling ,membranes ,bodembescherming ,permeability ,Alterra - Centrum Water en Klimaat - Abstract
Trisoplastr is a mixture of sand, bentonite and a polymer, used amongst others as landfill cover as well as barriers. Its permeability is generally lower than 1-2 x 10-11 m/s. Trisoplast keeps its functionality even in contact with different kinds of liquids, is not susceptible to cyclic drying and rewetting, and the permeability hardly depends on its dry bulk density. Tests with 10¿iaxial strain show only a slight increase in permeability. The functional lifetime of Trisoplast is governed by exchange of adsorbed sodium ions against dissolved calcium ions. This process depends on the composition of the pore water solution in the soil layers directly in contact with Trisoplast and the displacement rate of dissolved calcium ions either by convectiveor diffusive transport phenomena. The functional lifetime of Trisoplast even under relatively extreme conditions is at least 100 years and scores clearly better than the reference sand-bentonite barrier.
- Published
- 2003
21. Dietary practices in pyridoxine non-responsive homocystinuria: A European survey.
- Author
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Adam, S., Almeida, M.F., Carbasius Weber, E., Champion, H., Chan, H., Daly, A., Dixon, M., Dokoupil, K., Egli, D., Evans, S., Eyskens, F., Faria, A., Ferguson, C., Hallam, P., Heddrich-Ellerbrok, M., Jacobs, J., Jankowski, C., Lachmann, R., Lilje, R., Link, R., Lowry, S., Luyten, K., Macdonald, A., Maritz, C., Martins, E., Meyer, U., Muller, E., Murphy, E., Robertson, L.V., Rocha, J.C., Saruggia, I., Schick, P., Stafford, J., Stoelen, L., Terry, A., Thom, R., Hurk, T. van den, Rijn, M. van de, Teefelen-Heithoff, A. van, Webster, D., White, F.J., Wildgoose, J., Zweers, H., Adam, S., Almeida, M.F., Carbasius Weber, E., Champion, H., Chan, H., Daly, A., Dixon, M., Dokoupil, K., Egli, D., Evans, S., Eyskens, F., Faria, A., Ferguson, C., Hallam, P., Heddrich-Ellerbrok, M., Jacobs, J., Jankowski, C., Lachmann, R., Lilje, R., Link, R., Lowry, S., Luyten, K., Macdonald, A., Maritz, C., Martins, E., Meyer, U., Muller, E., Murphy, E., Robertson, L.V., Rocha, J.C., Saruggia, I., Schick, P., Stafford, J., Stoelen, L., Terry, A., Thom, R., Hurk, T. van den, Rijn, M. van de, Teefelen-Heithoff, A. van, Webster, D., White, F.J., Wildgoose, J., and Zweers, H.
- Abstract
1 december 2013, Item does not contain fulltext, BACKGROUND: Within Europe, the management of pyridoxine (B6) non-responsive homocystinuria (HCU) may vary but there is limited knowledge about treatment practice. AIM: A comparison of dietetic management practices of patients with B6 non-responsive HCU in European centres. METHODS: A cross-sectional audit by questionnaire was completed by 29 inherited metabolic disorder (IMD) centres: (14 UK, 5 Germany, 3 Netherlands, 2 Switzerland, 2 Portugal, 1 France, 1 Norway, 1 Belgium). RESULTS: 181 patients (73% >16years of age) with HCU were identified. The majority (66%; n=119) were on dietary treatment (1-10years, 90%; 11-16years, 82%; and >16years, 58%) with or without betaine and 34% (n=62) were on betaine alone. The median natural protein intake (g/day) on diet only was, by age: 1-10years, 12g; 11-16years, 11g; and >16years, 45g. With diet and betaine, median natural protein intake (g/day) by age was: 1-10years, 13g; 11-16years, 20g; and >16years, 38g. Fifty-two percent (n=15) of centres allocated natural protein by calculating methionine rather than a protein exchange system. A methionine-free l-amino acid supplement was prescribed for 86% of diet treated patients. Fifty-two percent of centres recommended cystine supplements for low plasma concentrations. Target treatment concentrations for homocystine/homocysteine (free/total) and frequency of biochemical monitoring varied. CONCLUSION: In B6 non-responsive HCU the prescription of dietary restriction by IMD centres declined with age, potentially associated with poor adherence in older patients. Inconsistencies in biochemical monitoring and treatment indicate the need for international consensus guidelines.
- Published
- 2013
22. Dietary management of urea cycle disorders: European practice.
- Author
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Adam, S., Almeida, M.F., Assoun, M., Baruteau, J., Bernabei, S.M., Bigot, S., Champion, H., Daly, A., Dassy, M., Dawson, S., Dixon, M., Dokoupil, K., Dubois, S., Dunlop, C., Evans, S., Eyskens, F., Faria, A., Favre, E., Ferguson, C., Goncalves, C., Gribben, J., Heddrich-Ellerbrok, M., Jankowski, C., Janssen-Regelink, R.G., Jouault, C., Laguerre, C., Verge, S. Le, Link, R., Lowry, S., Luyten, K., Macdonald, A., Maritz, C., McDowell, S., Meyer, U., Micciche, A., Robert, M., Robertson, L.V., Rocha, J.C., Rohde, C., Saruggia, I., Sjoqvist, E., Stafford, J., Terry, A., Thom, R., nde Kerckhove, K. Va, Rijn, M. van de, Teeffelen-Heithoff, A. van, Wegberg, A.M.J. van, Wyk, K. van, Vasconcelos, C., Vestergaard, H., Webster, D., White, F.J., Wildgoose, J., Zweers, H., Adam, S., Almeida, M.F., Assoun, M., Baruteau, J., Bernabei, S.M., Bigot, S., Champion, H., Daly, A., Dassy, M., Dawson, S., Dixon, M., Dokoupil, K., Dubois, S., Dunlop, C., Evans, S., Eyskens, F., Faria, A., Favre, E., Ferguson, C., Goncalves, C., Gribben, J., Heddrich-Ellerbrok, M., Jankowski, C., Janssen-Regelink, R.G., Jouault, C., Laguerre, C., Verge, S. Le, Link, R., Lowry, S., Luyten, K., Macdonald, A., Maritz, C., McDowell, S., Meyer, U., Micciche, A., Robert, M., Robertson, L.V., Rocha, J.C., Rohde, C., Saruggia, I., Sjoqvist, E., Stafford, J., Terry, A., Thom, R., nde Kerckhove, K. Va, Rijn, M. van de, Teeffelen-Heithoff, A. van, Wegberg, A.M.J. van, Wyk, K. van, Vasconcelos, C., Vestergaard, H., Webster, D., White, F.J., Wildgoose, J., and Zweers, H.
- Abstract
1 december 2013, Item does not contain fulltext, BACKGROUND: There is no published data comparing dietary management of urea cycle disorders (UCD) in different countries. METHODS: Cross-sectional data from 41 European Inherited Metabolic Disorder (IMD) centres (17 UK, 6 France, 5 Germany, 4 Belgium, 4 Portugal, 2 Netherlands, 1 Denmark, 1 Italy, 1 Sweden) was collected by questionnaire describing management of patients with UCD on prescribed protein restricted diets. RESULTS: Data for 464 patients: N-acetylglutamate synthase (NAGS) deficiency, n=10; carbamoyl phosphate synthetase (CPS1) deficiency, n=29; ornithine transcarbamoylase (OTC) deficiency, n=214; citrullinaemia, n=108; argininosuccinic aciduria (ASA), n=80; arginase deficiency, n=23 was reported. The majority of patients (70%; n=327) were aged 0-16y and 30% (n=137) >16y. Prescribed median protein intake/kg body weight decreased with age with little variation between disorders. The UK tended to give more total protein than other European countries particularly in infancy. Supplements of essential amino acids (EAA) were prescribed for 38% [n=174] of the patients overall, but were given more commonly in arginase deficiency (74%), CPS (48%) and citrullinaemia (46%). Patients in Germany (64%), Portugal (67%) and Sweden (100%) were the most frequent users of EAA. Only 18% [n=84] of patients were prescribed tube feeds, most commonly for CPS (41%); and 21% [n=97] were prescribed oral energy supplements. CONCLUSIONS: Dietary treatment for UCD varies significantly between different conditions, and between and within European IMD centres. Further studies examining the outcome of treatment compared with the type of dietary therapy and nutritional support received are required.
- Published
- 2013
23. Dietary management of urea cycle disorders: European practice
- Author
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UCL - (SLuc) Centre de pathologie anorectale de l'enfant, Adam, S., Almeida, M.F., Assoun, M., Baruteau, J., Bernabei, S.M., Bigot, S., Champion, H., Daly, A., Dassy, Martine, Dawson, S., Dixon, M., Dokoupil, K., Dubois, S., Dunlop, C., Evans, S., Eyskens, F., Faria, A., Favre, E., Ferguson, C., Goncalves, C., Gribben, J., Heddrich-Ellerbrok, M., Jankowski, C., Janssen-Regelink, R., Jouault, C., Laguerre, C., Le Verge, S., Link, R., Lowry, S., Luyten, K., MacDonald, A., Maritz, C., McDowell, S., Meyer, U., Micciche, A., Robert, M., Robertson, L.V., Rocha, J.C., Rohde, C., Saruggia, I., Sjoqvist, E., Stafford, J., Terry, A., Thom, R., Vande Kerckhove, K., van Rijn, M., van Teeffelen-Heithoff, A., Wegberg, A.van, van Wyk, K., Vasconcelos, C., Vestergaard, H., Webster, D., White, F.J., Wildgoose, J., Zweers, H., UCL - (SLuc) Centre de pathologie anorectale de l'enfant, Adam, S., Almeida, M.F., Assoun, M., Baruteau, J., Bernabei, S.M., Bigot, S., Champion, H., Daly, A., Dassy, Martine, Dawson, S., Dixon, M., Dokoupil, K., Dubois, S., Dunlop, C., Evans, S., Eyskens, F., Faria, A., Favre, E., Ferguson, C., Goncalves, C., Gribben, J., Heddrich-Ellerbrok, M., Jankowski, C., Janssen-Regelink, R., Jouault, C., Laguerre, C., Le Verge, S., Link, R., Lowry, S., Luyten, K., MacDonald, A., Maritz, C., McDowell, S., Meyer, U., Micciche, A., Robert, M., Robertson, L.V., Rocha, J.C., Rohde, C., Saruggia, I., Sjoqvist, E., Stafford, J., Terry, A., Thom, R., Vande Kerckhove, K., van Rijn, M., van Teeffelen-Heithoff, A., Wegberg, A.van, van Wyk, K., Vasconcelos, C., Vestergaard, H., Webster, D., White, F.J., Wildgoose, J., and Zweers, H.
- Abstract
Background: There is no published data comparing dietary management of urea cycle disorders (UCD) in different countries. Methods: Cross-sectional data from 41 European Inherited Metabolic Disorder (IMD) centres (17 UK, 6 France, 5 Germany, 4 Belgium, 4 Portugal, 2 Netherlands, 1 Denmark, 1 Italy, 1 Sweden) was collected by questionnaire describing management of patients with UCD on prescribed protein restricted diets. Results: Data for 464 patients: N-acetylglutamate synthase (NAGS) deficiency, n=10; carbamoyl phosphate synthetase (CPS1) deficiency, n=29; ornithine transcarbamoylase (OTC) deficiency, n=214; citrullinaemia, n=108; argininosuccinic aciduria (ASA), n=80; arginase deficiency, n=23 was reported. The majority of patients (70%; n=327) were aged 0-16. y and 30% (n=137) >. 16. y. Prescribed median protein intake/kg body weight decreased with age with little variation between disorders. The UK tended to give more total protein than other European countries particularly in infancy. Supplements of essential amino acids (EAA) were prescribed for 38% [n=174] of the patients overall, but were given more commonly in arginase deficiency (74%), CPS (48%) and citrullinaemia (46%). Patients in Germany (64%), Portugal (67%) and Sweden (100%) were the most frequent users of EAA. Only 18% [n=84] of patients were prescribed tube feeds, most commonly for CPS (41%); and 21% [n=97] were prescribed oral energy supplements. Conclusions: Dietary treatment for UCD varies significantly between different conditions, and between and within European IMD centres. Further studies examining the outcome of treatment compared with the type of dietary therapy and nutritional support received are required. © 2013 Elsevier Inc.
- Published
- 2013
24. FOOD INTAKE OF ADULT DUTCH PATIENTS WITH MITOCHONDRIAL DISEASES
- Author
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Zweers, H., Janssen, M., Engelen, B.G.M. van, Wanten, G.J.A., Zweers, H., Janssen, M., Engelen, B.G.M. van, and Wanten, G.J.A.
- Abstract
Item does not contain fulltext
- Published
- 2012
25. Verspreiden van bagger op het land in klei- en veengebieden
- Author
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Harmsen, J., Rietra, R.P.J.J., Groenenberg, J.E., Lahr, J., van den Toorn, A., Zweers, H., Harmsen, J., Rietra, R.P.J.J., Groenenberg, J.E., Lahr, J., van den Toorn, A., and Zweers, H.
- Abstract
De meeste baggerspecie, inclusief licht verontreinigde baggerspecie die vrijkomt bij onderhoud van watergangen, wordt verspreid op landbouwpercelen. Het in dit rapport beschreven onderzoek is opgezet om op praktijkschaal na te gaan of op dit moment de praktijk van het verspreiden van licht verontreinigde bagger meetbare effecten heeft veroorzaakt en aan te geven wat er in de toekomst kan worden verwacht bij voortzetting van de huidige praktijk. De belangrijkste conclusie van het onderzoek is dat in de onderzochte klei- en veengebieden de praktijk van verspreiden van baggerspecie niet heeft geleid tot een sterke achteruitgang van de bodem. Achteruitgang is echter wel mogelijk als de praktijk van verspreiden meer opschuift in de richting van de kwaliteit die maximaal is toegestaan. Op basis van het onderzoek worden diverse aanbevelingen voor het beleid gemaakt.
- Published
- 2012
26. Visie op de ecologische functie van de Rijkskanalen in Noord-Brabant
- Author
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Bakermans, M. (author), Zweers, H. (author), Bakermans, M. (author), and Zweers, H. (author)
- Abstract
Rijkswaterstaat geeft in de visie op de ecologische functie van de Rijkskanalen in Noord-Brabant de kaders en doelstellingen aan die gehanteerd worden voor het invullen van de ecologische functie van de kanalen die in beheer zijn van Rijkswaterstaat, directie Noord-Brabant. Deze visie heeft betrekking op de gehele kanaalzone: dat wil zeggen het kanaal zelf, de oevers en de bijbehorende bermen, dijken en sloten. De visie doet een uitspraak over: 1. De mate waarin Rijkswaterstaat verantwoordelijk is om de Ecologische verbindingszone (EVZ) te realiseren. 2. De ecologische mogelijkheden van de kanalen. 3. De concrete invulling van de ecologische functie. Voor zover binnen de provincie Noord-Brabant gaat het in hoofdlijnen om de Zuid-Willemsvaart, het Wilhelminakanaal en het Markkanaal. De gehele lengte van deze kanalen is in het Waterhuishoudingsplan van de provincie aangegeven als Ecologische Verbindingszone. De kanalen maken hiermee onderdeel uit van een groot netwerk van natuurgebieden in de provincie, ook wel aangeduid als Groene Hoofdstructuur (GHS). Rijkswaterstaat heeft naast taken als kwaliteit-, kwantiteit- en vaarwegbeheerder ook een taak op ecologisch gebied, namelijk het invullen van de ecologische functie in afstemming met de diverse andere functies van de kanalen en hun directe omgeving. Aangezien de kanalen gegraven zijn en niet natuurlijke elementen vormen, is er geen oorspronkelijk referentiekader. De invulling van de ecologische functie kan dan ook op verschillende manieren plaatsvinden., KWP-collection
- Published
- 2000
27. Dysphagia, malnutrition and gastrointestinal problems in patients with mitochondrial disease caused by the m3243a>g mutation
- Author
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Paul de Laat, Zweers, H. E. E., Knuijt, S., Smeitink, J. A. M., Wanten, G. J. A., and Janssen, M. C. H.
- Subjects
lnfectious Diseases and Global Health Radboud Institute for Molecular Life Sciences [Radboudumc 4] ,Metabolic Disorders Radboud Institute for Molecular Life Sciences [Radboudumc 6] ,Disorders of movement Donders Center for Medical Neuroscience [Radboudumc 3] - Abstract
Contains fulltext : 155085.pdf (Publisher’s version ) (Open Access) BACKGROUND: Previous research has shown that dysphagia and gastrointestinal problems occur frequently in carriers of the m.3243A>G mutation; however, the exact frequency and severity have not been determined. We hypothesise that adult carriers have an increased risk for malnutrition. METHODS: In this observational study we evaluated the presence of gastrointestinal problems and dysphagia in 92 carriers of the m.3243A>G mutation. The severity of the general disease involvement was classified using the Newcastle Mitochondrial Disease Adult Scale (NMDAS). Gastrointestinal involvement, dysphagia and the risk for malnutrition were scored using the Gastrointestinal Symptoms Questionnaire and the Malnutrition Universal Screening Tool. Gastrointestinal symptoms and anthropometrics were compared with healthy controls. RESULTS: Our results show that the height, weight and body mass index (BMI) of these carriers were lower than the national average (p < 0.05). Seventy-nine carriers (86%) suffered from at least one gastrointestinal symptom, mainly flatulence or hard stools. Both frequency and severity of symptoms were significantly increased compared with reference data of healthy Dutch adults. Of the carriers, 45% reported (mostly mild) dysphagia. Solid foods cause more problems than liquids. A negative correlation between BMI and heteroplasmy levels in urinary epithelial cells (UEC) was present (Spearman correlation coefficient = - 0.319, p = 0.003). CONCLUSION: Dysphagia and gastrointestinal problems, especially constipation, are common symptoms in the total m.3243A>G carriers cohort and are not related to heteroplasmy levels in UEC or disease severity. The severity of gastrointestinal problems as well as overall disease severity is associated with an increased risk for malnutrition.
28. Vegetation succession in lakes of West Connemara, Ireland: comparingpredicted and actual changes
- Author
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van Groenendael, J. M., Woltjer, I., Roepers, R. G., and Zweers, H. R.
- Subjects
LAKES ,PHOSPHATES ,WETLANDS - Published
- 1996
- Full Text
- View/download PDF
29. Exploring modes of microbial interactions with implications for methane cycling.
- Author
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Brenzinger K, Glatter T, Hakobyan A, Meima-Franke M, Zweers H, Liesack W, and Bodelier PLE
- Subjects
- Methylomonas metabolism, Methylomonas genetics, Proteomics, Proteome, Heterotrophic Processes, Oxygenases metabolism, Oxygenases genetics, Methane metabolism, Microbial Interactions, Volatile Organic Compounds metabolism, Carbon Dioxide metabolism
- Abstract
Methanotrophs are the sole biological sink of methane. Volatile organic compounds (VOCs) produced by heterotrophic bacteria have been demonstrated to be a potential modulating factor of methane consumption. Here, we identify and disentangle the impact of the volatolome of heterotrophic bacteria on the methanotroph activity and proteome, using Methylomonas as model organism. Our study unambiguously shows how methanotrophy can be influenced by other organisms without direct physical contact. This influence is mediated by VOCs (e.g. dimethyl-polysulphides) or/and CO2 emitted during respiration, which can inhibit growth and methane uptake of the methanotroph, while other VOCs had a stimulating effect on methanotroph activity. Depending on whether the methanotroph was exposed to the volatolome of the heterotroph or to CO2, proteomics revealed differential protein expression patterns with the soluble methane monooxygenase being the most affected enzyme. The interaction between methanotrophs and heterotrophs can have strong positive or negative effects on methane consumption, depending on the species interacting with the methanotroph. We identified potential VOCs involved in the inhibition while positive effects may be triggered by CO2 released by heterotrophic respiration. Our experimental proof of methanotroph-heterotroph interactions clearly calls for detailed research into strategies on how to mitigate methane emissions., (© The Author(s) 2024. Published by Oxford University Press on behalf of FEMS.)
- Published
- 2024
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30. Having breakfast has no clinically relevant effect on bioelectrical impedance measurements in healthy adults.
- Author
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Korzilius JW, Oppenheimer SE, de Roos NM, Wanten GJA, and Zweers H
- Subjects
- Humans, Adult, Female, Adolescent, Young Adult, Middle Aged, Aged, Male, Prospective Studies, Electric Impedance, Body Mass Index, Absorptiometry, Photon, Breakfast, Body Composition
- Abstract
Background: Bioelectrical impedance analysis (BIA) is commonly used to evaluate body composition as part of nutritional assessment. Current guidelines recommend performing BIA measurements in a fasting state of at least 2 h in a clinical setting and 8 h in a research setting. However, since asking patients with malnutrition or sarcopenia to fast is not desirable and literature to support the strategy in the guidelines is lacking, this study aimed to assess the impact of breakfast on BIA measurements., Methods: We performed an explorative, prospective study in healthy volunteers aged between 18 and 70 years, with a normal fluid balance and a body mass index between 18.5 and 30 kg/m
2 . BIA measurements were performed according to the standard operating procedure in the fasting state, and 1, 2, 3, and 4 h after ingesting a standardized breakfast meal of about 400 kcal with a 150 mL drink, using the hand-to-food single-frequency BIA (Bodystat500 ®). The Kyle formula was used to calculate the primary outcome, i.e. fat-free mass (FFM, kg). A linear mixed model was used to compare baseline values with other time points. A difference of 1 kg in FFM was considered clinically relevant., Results: Thirty-nine (85% female) volunteers were included, with a median age of 28 years (IQR 24-38). In 90% of the participants, having breakfast had no clinically relevant impact on the estimated FFM. For the group, the most pronounced mean difference, a statistically but not clinically significant higher value of 0.2 kg (0.4%), was observed after 3 h of fasting compared to baseline. No statistically significant differences were found at the other time points., Conclusion: Eating affects single-frequency BIA measurements, but differences in FFM remain below clinical relevance for most participants when using a standardized breakfast. Thus, the current study suggests performing a BIA measurement in a fasting state is not required., (© 2023. The Author(s).)- Published
- 2023
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31. Patient-Reported Experiences with a Low-Carbohydrate Ketogenic Diet: An International Survey in Patients with McArdle Disease.
- Author
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Løkken N, Voermans NC, Andersen LK, Karazi W, Reason SL, Zweers H, Wilms G, Santalla A, Susanibar E, Lucia A, and Vissing J
- Subjects
- Humans, Diet, Carbohydrate-Restricted methods, Ketone Bodies, Patient Reported Outcome Measures, Carbohydrates, Glycogen Storage Disease Type V drug therapy, Diet, Ketogenic methods
- Abstract
The low-carbohydrate ketogenic diet (LCKD) has attracted increased attention in recent years as a potential treatment option for individuals with McArdle disease (glycogen storage disease type V), and despite the absence of strong scientific evidence of the LCKD's benefits, increased numbers of individuals with McArdle disease have tried a LCKD. The objective of this study was to collect patient-reported experiences with a LCKD. We aimed to estimate the immediate prevalence of individuals that had tried a LCKD in an international McArdle disease cohort, and we aimed to report on the patient-reported experiences with the diet, both positive and negative. A total of 183 responses were collected from individuals with McArdle disease from 18 countries. We found that one-third of the cohort had tried a LCKD, and almost 90% experienced some degree of positive effect, with the most prominent effects on McArdle disease-related core symptoms (e.g., activity intolerance, muscle pain, and muscle fatigue). Adverse effects were rare and generally rated as mild to moderate. These patient-reported findings underline the need for randomized clinical trials to decisively determine if a LCKD is a suitable nutritional strategy for patients with McArdle disease. The results from this study can prompt and contribute to the design of such a clinical trial.
- Published
- 2023
- Full Text
- View/download PDF
32. Exploring the Volatiles Released from Roots of Wild and Domesticated Tomato Plants under Insect Attack.
- Author
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Lee Díaz AS, Rizaludin MS, Zweers H, Raaijmakers JM, and Garbeva P
- Subjects
- Animals, Herbivory, Spodoptera, Solanum lycopersicum genetics, Solanum, Volatile Organic Compounds
- Abstract
Plants produce volatile organic compounds that are important in communication and defense. While studies have largely focused on volatiles emitted from aboveground plant parts upon exposure to biotic or abiotic stresses, volatile emissions from roots upon aboveground stress are less studied. Here, we investigated if tomato plants under insect herbivore attack exhibited a different root volatilome than non-stressed plants, and whether this was influenced by the plant's genetic background. To this end, we analyzed one domesticated and one wild tomato species, i.e., Solanum lycopersicum cv Moneymaker and Solanum pimpinellifolium, respectively, exposed to leaf herbivory by the insect Spodoptera exigua. Root volatiles were trapped with two sorbent materials, HiSorb and PDMS, at 24 h after exposure to insect stress. Our results revealed that differences in root volatilome were species-, stress-, and material-dependent. Upon leaf herbivory, the domesticated and wild tomato species showed different root volatile profiles. The wild species presented the largest change in root volatile compounds with an overall reduction in monoterpene emission under stress. Similarly, the domesticated species presented a slight reduction in monoterpene emission and an increased production of fatty-acid-derived volatiles under stress. Volatile profiles differed between the two sorbent materials, and both were required to obtain a more comprehensive characterization of the root volatilome. Collectively, these results provide a strong basis to further unravel the impact of herbivory stress on systemic volatile emissions.
- Published
- 2022
- Full Text
- View/download PDF
33. Correction to: Ketogenic diet for mitochondrial disease: a systematic review on efficacy and safety.
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Zweers H, van Wegberg AMJ, Janssen MCH, and Wortmann SB
- Published
- 2021
- Full Text
- View/download PDF
34. Antimicrobial Compounds in the Volatilome of Social Spider Communities.
- Author
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Lammers A, Zweers H, Sandfeld T, Bilde T, Garbeva P, Schramm A, and Lalk M
- Abstract
Social arthropods such as termites, ants, and bees are among others the most successful animal groups on earth. However, social arthropods face an elevated risk of infections due to the dense colony structure, which facilitates pathogen transmission. An interesting hypothesis is that social arthropods are protected by chemical compounds produced by the arthropods themselves, microbial symbionts, or plants they associate with. Stegodyphus dumicola is an African social spider species, inhabiting communal silk nests. Because of the complex three-dimensional structure of the spider nest antimicrobial volatile organic compounds (VOCs) are a promising protection against pathogens, because of their ability to diffuse through air-filled pores. We analyzed the volatilomes of S. dumicola , their nests, and capture webs in three locations in Namibia and assessed their antimicrobial potential. Volatilomes were collected using polydimethylsiloxane (PDMS) tubes and analyzed using GC/Q-TOF. We showed the presence of 199 VOCs and tentatively identified 53 VOCs. More than 40% of the tentatively identified VOCs are known for their antimicrobial activity. Here, six VOCs were confirmed by analyzing pure compounds namely acetophenone, 1,3-benzothiazole, 1-decanal, 2-decanone, 1-tetradecene, and docosane and for five of these compounds the antimicrobial activity were proven. The nest and web volatilomes had many VOCs in common, whereas the spider volatilomes were more differentiated. Clear differences were identified between the volatilomes from the different sampling sites which is likely justified by differences in the microbiomes of the spiders and nests, the plants, and the different climatic conditions. The results indicate the potential relevance of the volatilomes for the ecological success of S. dumicola ., Competing Interests: The authors declare that the research was conducted in the absence of any commercial or financial relationships that could be construed as a potential conflict of interest., (Copyright © 2021 Lammers, Zweers, Sandfeld, Bilde, Garbeva, Schramm and Lalk.)
- Published
- 2021
- Full Text
- View/download PDF
35. Ketogenic diet for mitochondrial disease: a systematic review on efficacy and safety.
- Author
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Zweers H, van Wegberg AMJ, Janssen MCH, and Wortmann SB
- Subjects
- Adult, Animals, Child, Humans, Prospective Studies, Diet, Ketogenic, Drug Resistant Epilepsy, Epilepsy, Mitochondrial Diseases genetics
- Abstract
Background: No curative therapy for mitochondrial disease (MD) exists, prioritizing supportive treatment for symptom relief. In animal and cell models ketones decrease oxidative stress, increase antioxidants and scavenge free radicals, putting ketogenic diets (KDs) on the list of management options for MD. Furthermore, KDs are well-known, safe and effective treatments for epilepsy, a frequent symptom of MD. This systematic review evaluates efficacy and safety of KD for MD., Methods: We searched Pubmed, Cochrane, Embase and Cinahl (November 2020) with search terms linked to MD and KD. From the identified records, we excluded studies on Pyruvate Dehydrogenase Complex deficiency. From these eligible reports, cases without a genetically confirmed diagnosis and cases without sufficient data on KD and clinical course were excluded. The remaining studies were included in the qualitative analysis., Results: Only 20 cases (14 pediatric) from the 694 papers identified met the inclusion criteria (one controlled trial (n = 5), 15 case reports). KD led to seizure control in 7 out of 8 cases and improved muscular symptoms in 3 of 10 individuals. In 4 of 20 cases KD reversed the clinical phenotype (e.g. cardiomyopathy, movement disorder). In 5 adults with mitochondrial DNA deletion(s) related myopathy rhabdomyolysis led to cessation of KD. Three individuals with POLG mutations died while being on KD, however, their survival was not different compared to individuals with POLG mutations without KD., Conclusion: Data on efficacy and safety of KD for MD is too scarce for general recommendations. KD should be considered in individuals with MD and therapy refractory epilepsy, while KD is contraindicated in mitochondrial DNA deletion(s) related myopathy. When considering KD for MD the high rate of adverse effects should be taken into account, but also spectacular improvements in individual cases. KD is a highly individual management option in this fragile patient group and requires an experienced team. To increase knowledge on this-individually-promising management option more (prospective) studies using adequate outcome measures are crucial.
- Published
- 2021
- Full Text
- View/download PDF
36. Effect of the amount of organic trigger compounds, nitrogen and soil microbial biomass on the magnitude of priming of soil organic matter.
- Author
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Di Lonardo DP, de Boer W, Zweers H, and van der Wal A
- Subjects
- Carbon Dioxide analysis, Biomass, Nitrogen analysis, Organic Chemicals analysis, Soil chemistry, Soil Microbiology
- Abstract
Priming effects (PEs) are defined as short-term changes in the turnover of soil organic matter (SOM) caused by the addition of easily degradable organic compounds to the soil. PEs are ubiquitous but the direction (acceleration or retardation of SOM decomposition) and magnitude are not easy to predict. It has been suggested that the ratio between the amount of added PE-triggering substrate to the size of initial soil microbial biomass is an important factor influencing PEs. However, this is mainly based on comparison of different studies and not on direct experimentation. The aim of the current study is to examine the impact of glucose-to-microbial biomass ratios on PEs for three different ecosystems. We did this by adding three different amounts of 13C-glucose with or without addition of mineral N (NH4NO3) to soils collected from arable lands, grasslands and forests. The addition of 13C-glucose was equivalent to 15%, 50% and 200% of microbial biomass C. After one month of incubation, glucose had induced positive PEs for almost all the treatments, with differences in magnitude related to the soil origin and the amount of glucose added. For arable and forest soils, the primed C increased with increasing amount of glucose added, whereas for grassland soils this relationship was negative. We found positive correlations between glucose-derived C and primed C and the strength of these correlations was different among the three ecosystems considered. Generally, additions of mineral N next to glucose (C:N = 15:1) had little effect on the flux of substrate-derived C and primed C. Overall, our study does not support the hypothesis that the trigger-substrate to microbial biomass ratio can be an important predictor of PEs. Rather our results indicate that the amount of energy obtained from decomposing trigger substrates is an important factor for the magnitude of PEs., Competing Interests: The authors have declared that no competing interests exist.
- Published
- 2019
- Full Text
- View/download PDF
37. Exploring bacterial interspecific interactions for discovery of novel antimicrobial compounds.
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Tyc O, de Jager VCL, van den Berg M, Gerards S, Janssens TKS, Zaagman N, Kai M, Svatos A, Zweers H, Hordijk C, Besselink H, de Boer W, and Garbeva P
- Subjects
- Burkholderia growth & development, Gene Expression Profiling, Humans, Metabolomics, Paenibacillus growth & development, Secondary Metabolism, Volatile Organic Compounds analysis, Anti-Bacterial Agents isolation & purification, Anti-Bacterial Agents metabolism, Antibiosis, Biological Products isolation & purification, Biological Products metabolism, Burkholderia physiology, Paenibacillus physiology
- Abstract
Recent studies indicated that the production of secondary metabolites by soil bacteria can be triggered by interspecific interactions. However, little is known to date about interspecific interactions between Gram-positive and Gram-negative bacteria. In this study, we aimed to understand how the interspecific interaction between the Gram-positive Paenibacillus sp. AD87 and the Gram-negative Burkholderia sp. AD24 affects the fitness, gene expression and the production of soluble and volatile secondary metabolites of both bacteria. To obtain better insight into this interaction, transcriptome and metabolome analyses were performed. Our results revealed that the interaction between the two bacteria affected their fitness, gene expression and the production of secondary metabolites. During interaction, the growth of Paenibacillus was not affected, whereas the growth of Burkholderia was inhibited at 48 and 72 h. Transcriptome analysis revealed that the interaction between Burkholderia and Paenibacillus caused significant transcriptional changes in both bacteria as compared to the monocultures. The metabolomic analysis revealed that the interaction increased the production of specific volatile and soluble antimicrobial compounds such as 2,5-bis(1-methylethyl)-pyrazine and an unknown Pederin-like compound. The pyrazine volatile compound produced by Paenibacillus was subjected to bioassays and showed strong inhibitory activity against Burkholderia and a range of plant and human pathogens. Moreover, strong additive antimicrobial effects were observed when soluble extracts from the interacting bacteria were combined with the pure 2,5-bis(1-methylethyl)-pyrazine. The results obtained in this study highlight the importance to explore bacterial interspecific interactions to discover novel secondary metabolites and to perform simultaneously metabolomics of both, soluble and volatile compounds., (© 2017 The Authors. Microbial Biotechnology published by John Wiley & Sons Ltd and Society for Applied Microbiology.)
- Published
- 2017
- Full Text
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38. Soil networks become more connected and take up more carbon as nature restoration progresses.
- Author
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Morriën E, Hannula SE, Snoek LB, Helmsing NR, Zweers H, de Hollander M, Soto RL, Bouffaud ML, Buée M, Dimmers W, Duyts H, Geisen S, Girlanda M, Griffiths RI, Jørgensen HB, Jensen J, Plassart P, Redecker D, Schmelz RM, Schmidt O, Thomson BC, Tisserant E, Uroz S, Winding A, Bailey MJ, Bonkowski M, Faber JH, Martin F, Lemanceau P, de Boer W, van Veen JA, and van der Putten WH
- Subjects
- Bacteria metabolism, Carbon chemistry, Environmental Restoration and Remediation, Fungi metabolism, Biomass, Biota physiology, Food Chain, Soil chemistry, Soil Microbiology
- Abstract
Soil organisms have an important role in aboveground community dynamics and ecosystem functioning in terrestrial ecosystems. However, most studies have considered soil biota as a black box or focussed on specific groups, whereas little is known about entire soil networks. Here we show that during the course of nature restoration on abandoned arable land a compositional shift in soil biota, preceded by tightening of the belowground networks, corresponds with enhanced efficiency of carbon uptake. In mid- and long-term abandoned field soil, carbon uptake by fungi increases without an increase in fungal biomass or shift in bacterial-to-fungal ratio. The implication of our findings is that during nature restoration the efficiency of nutrient cycling and carbon uptake can increase by a shift in fungal composition and/or fungal activity. Therefore, we propose that relationships between soil food web structure and carbon cycling in soils need to be reconsidered.
- Published
- 2017
- Full Text
- View/download PDF
39. Microbial Small Talk: Volatiles in Fungal-Bacterial Interactions.
- Author
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Schmidt R, Etalo DW, de Jager V, Gerards S, Zweers H, de Boer W, and Garbeva P
- Abstract
There is increasing evidence that volatile organic compounds (VOCs) play an important role in the interactions between fungi and bacteria, two major groups of soil inhabiting microorganisms. Yet, most of the research has been focused on effects of bacterial volatiles on suppression of plant pathogenic fungi whereas little is known about the responses of bacteria to fungal volatiles. In the current study we performed a metabolomics analysis of volatiles emitted by several fungal and oomycetal soil strains under different nutrient conditions and growth stages. The metabolomics analysis of the tested fungal and oomycetal strains revealed different volatile profiles dependent on the age of the strains and nutrient conditions. Furthermore, we screened the phenotypic responses of soil bacterial strains to volatiles emitted by fungi. Two bacteria, Collimonas pratensis Ter291 and Serratia plymuthica PRI-2C, showed significant changes in their motility, in particular to volatiles emitted by Fusarium culmorum. This fungus produced a unique volatile blend, including several terpenes. Four of these terpenes were selected for further tests to investigate if they influence bacterial motility. Indeed, these terpenes induced or reduced swimming and swarming motility of S. plymuthica PRI-2C and swarming motility of C. pratensis Ter291, partly in a concentration-dependent manner. Overall the results of this work revealed that bacteria are able to sense and respond to fungal volatiles giving further evidence to the suggested importance of volatiles as signaling molecules in fungal-bacterial interactions.
- Published
- 2016
- Full Text
- View/download PDF
40. Volatiles in Inter-Specific Bacterial Interactions.
- Author
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Tyc O, Zweers H, de Boer W, and Garbeva P
- Abstract
The importance of volatile organic compounds for functioning of microbes is receiving increased research attention. However, to date very little is known on how inter-specific bacterial interactions effect volatiles production as most studies have been focused on volatiles produced by monocultures of well-described bacterial genera. In this study we aimed to understand how inter-specific bacterial interactions affect the composition, production and activity of volatiles. Four phylogenetically different bacterial species namely: Chryseobacterium, Dyella, Janthinobacterium, and Tsukamurella were selected. Earlier results had shown that pairwise combinations of these bacteria induced antimicrobial activity in agar media whereas this was not the case for monocultures. In the current study, we examined if these observations were also reflected by the production of antimicrobial volatiles. Thus, the identity and antimicrobial activity of volatiles produced by the bacteria were determined in monoculture as well in pairwise combinations. Antimicrobial activity of the volatiles was assessed against fungal, oomycetal, and bacterial model organisms. Our results revealed that inter-specific bacterial interactions affected volatiles blend composition. Fungi and oomycetes showed high sensitivity to bacterial volatiles whereas the effect of volatiles on bacteria varied between no effects, growth inhibition to growth promotion depending on the volatile blend composition. In total 35 volatile compounds were detected most of which were sulfur-containing compounds. Two commonly produced sulfur-containing volatile compounds (dimethyl disulfide and dimethyl trisulfide) were tested for their effect on three target bacteria. Here, we display the importance of inter-specific interactions on bacterial volatiles production and their antimicrobial activities.
- Published
- 2015
- Full Text
- View/download PDF
41. A fragrant neighborhood: volatile mediated bacterial interactions in soil.
- Author
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Schulz-Bohm K, Zweers H, de Boer W, and Garbeva P
- Abstract
There is increasing evidence that volatile organic compounds (VOCs) play essential roles in communication and competition between soil microorganisms. Here we assessed volatile-mediated interactions of a synthetic microbial community in a model system that mimics the natural conditions in the heterogeneous soil environment along the rhizosphere. Phylogenetic different soil bacterial isolates (Burkholderia sp., Dyella sp., Janthinobacterium sp., Pseudomonas sp., and Paenibacillus sp.) were inoculated as mixtures or monoculture in organic-poor, sandy soil containing artificial root exudates (ARE) and the volatile profile and growth were analyzed. Additionally, a two-compartment system was used to test if volatiles produced by inter-specific interactions in the rhizosphere can stimulate the activity of starving bacteria in the surrounding, nutrient-depleted soil. The obtained results revealed that both microbial interactions and shifts in microbial community composition had a strong effect on the volatile emission. Interestingly, the presence of a slow-growing, low abundant Paenibacillus strain significantly affected the volatile production by the other abundant members of the bacterial community as well as the growth of the interacting strains. Furthermore, volatiles released by mixtures of root-exudates consuming bacteria stimulated the activity and growth of starved bacteria. Besides growth stimulation, also an inhibition in growth was observed for starving bacteria exposed to microbial volatiles. The current work suggests that volatiles produced during microbial interactions in the rhizosphere have a significant long distance effect on microorganisms in the surrounding, nutrient-depleted soil.
- Published
- 2015
- Full Text
- View/download PDF
42. Dysphagia, malnutrition and gastrointestinal problems in patients with mitochondrial disease caused by the m3243A>G mutation.
- Author
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de Laat P, Zweers HE, Knuijt S, Smeitink JA, Wanten GJ, and Janssen MC
- Subjects
- Adult, Constipation etiology, DNA Mutational Analysis, Deglutition Disorders etiology, Female, Follow-Up Studies, Heterozygote, Humans, MELAS Syndrome complications, Male, Malnutrition etiology, Middle Aged, Retrospective Studies, Surveys and Questionnaires, Constipation genetics, DNA, Mitochondrial genetics, Deglutition Disorders genetics, MELAS Syndrome genetics, Malnutrition genetics, Mutation
- Abstract
Background: Previous research has shown that dysphagia and gastrointestinal problems occur frequently in carriers of the m.3243A>G mutation; however, the exact frequency and severity have not been determined. We hypothesise that adult carriers have an increased risk for malnutrition., Methods: In this observational study we evaluated the presence of gastrointestinal problems and dysphagia in 92 carriers of the m.3243A>G mutation. The severity of the general disease involvement was classified using the Newcastle Mitochondrial Disease Adult Scale (NMDAS). Gastrointestinal involvement, dysphagia and the risk for malnutrition were scored using the Gastrointestinal Symptoms Questionnaire and the Malnutrition Universal Screening Tool. Gastrointestinal symptoms and anthropometrics were compared with healthy controls., Results: Our results show that the height, weight and body mass index (BMI) of these carriers were lower than the national average (p < 0.05). Seventy-nine carriers (86%) suffered from at least one gastrointestinal symptom, mainly flatulence or hard stools. Both frequency and severity of symptoms were significantly increased compared with reference data of healthy Dutch adults. Of the carriers, 45% reported (mostly mild) dysphagia. Solid foods cause more problems than liquids. A negative correlation between BMI and heteroplasmy levels in urinary epithelial cells (UEC) was present (Spearman correlation coefficient = - 0.319, p = 0.003)., Conclusion: Dysphagia and gastrointestinal problems, especially constipation, are common symptoms in the total m.3243A>G carriers cohort and are not related to heteroplasmy levels in UEC or disease severity. The severity of gastrointestinal problems as well as overall disease severity is associated with an increased risk for malnutrition.
- Published
- 2015
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