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155 results on '"Yang, Y.-N."'

2. Isomorphism problem and homological properties of DG free algebras

Author

Mao, X. -F., Xie, J. -F., Yang, Y. -N., and Abla, Almire.

Subjects
Mathematics - Rings and Algebras, 16E45, 16E65, 16W20, 16W50
Abstract

A differential graded (DG for short) free algebra $\mathcal{A}$ is a connected cochain DG algebra such that its underlying graded algebra is $$\mathcal{A}^{\#}=\k\langle x_1,x_2,\cdots, x_n\rangle,\,\, \text{with}\,\, |x_i|=1,\,\, \forall i\in \{1,2,\cdots, n\}.$$ We prove that the differential structures on DG free algebras are in one to one correspondence with the set of crisscross ordered $n$-tuples of $n\times n$ matrixes. We also give a criterion to judge whether two DG free algebras are isomorphic. As an application, we consider the case of $n=2$. Based on the isomorphism classification, we compute the cohomology graded algebras of non-trivial DG free algebras with $2$ generators, and show that all those non-trivial DG free algebras are Koszul and Calabi-Yau., Comment: 29pages

Published
2018

3. DG polynomial algebras and their homological properties

Author

Mao, X. -F., Gao, X. -D., Yang, Y. -N., and Chen, J. -H.

Subjects
Mathematics - Rings and Algebras, 16E45, 16E65, 16W20, 16W50
Abstract

In this paper, we introduce and study differential graded (DG for short) polynomial algebras. In brief, a DG polynomial algebra $\mathcal{A}$ is a connected cochain DG algebra such that its underlying graded algebra $\mathcal{A}^{\#}$ is a polynomial algebra $\mathbb{k}[x_1,x_2,\cdots, x_n]$ with $|x_i|=1$, for any $i\in \{1,2,\cdots, n\}$. We describe all possible differential structures on DG polynomial algebras; compute their DG automorphism groups; study their isomorphism problems; and show that they are all homologically smooth and Gorestein DG algebras. Furthermore, it is proved that the DG polynomial algebra $\mathcal{A}$ is a Calabi-Yau DG algebra when its differential $\partial_{\mathcal{A}}\neq 0$ and the trivial DG polynomial algebra $(\mathcal{A}, 0)$ is Calabi-Yau if and only if $n$ is an odd integer., Comment: It has been accepted for publication in SCIENCE CHINA Mathematics. 20 pages

Published
2017
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7. The effect of time spent sitting and excessive gaming on the weight status, and perceived weight stigma among Taiwanese young adults

Author

Kamolthip, R., Yang, Y. -N, Latner, J. D., O'Brien, K. S., Chang, Y. -L, Lin, C. -C, Pakpour, Amir H., Lin, C. -Y, Kamolthip, R., Yang, Y. -N, Latner, J. D., O'Brien, K. S., Chang, Y. -L, Lin, C. -C, Pakpour, Amir H., and Lin, C. -Y

Abstract

Background: During the COVID-19 pandemic, physical inactivity and sedentary behaviors (i.e., longer sitting time and excessive gaming) increased because governments across the globe adopted stringent mitigation strategies such as social distancing and lockdowns to curb the spread of the virus. Excessive gaming was one of the coping mechanisms used to deal with the pressure associated with the pandemic. Moreover, perceived weight stigma (PWS) and weight status became more salient concerns among young adults during the COVID-19 pandemic. The current study sought to investigate the relationship between time spent sitting, excessive gaming, weight status, and PWS of Taiwanese Young adults. Additionally, weight status and PWS were examined as mediators between both sedentary behaviors. Methods: This cross-sectional study involved 600 participants who were recruited through Taiwan universities. All participants completed a demographic questionnaire (including weight and height) and self-report measures including the International Physical Activity Questionnaire short form (IPAQ-SF), the Perceived Weight Stigma Scale (PWSS), and the Internet Gaming Disorder Scale-short form (IGDS9-SF). PROCESS model was performed to test the potential mediation roles of weight status and PWS. Moreover, we categorized participants into two groups based on the sitting-time item in the IPAQ-SF: students whose sitting time was less than 8 h daily, and those more than 8 h daily. Results: The group that had less than 8 h had significantly higher PWS and IGDS9-SF scores than the other group. Sitting time was negatively associated with weight status, PWS, and IGDS9-SF. Additionally, we found a significantly direct effect between time spent sitting and excessive gaming. Both weight status and PWS were significant mediators in the association between time spent sitting and excessive gaming. Conclusions: The present study demonstrated important negative correlates of excessive sedentary behaviors. Pr

Published
2023
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9. APPLICATION OF POTASSIUM FULVIC ACID IMPROVING TOLERANCE OF SECALE CEREALE L. SEEDLINGS TO CADMIUM STRESS AND FREEZE-THAW ENVIRONMENT.

Author

PAN, X. Y., BAO, G. Z., YANG, Y. N., ZHANG, X., GUO, J. C., FAN, X. Y., XIANG, T., LI, G. M., and ZHAO, H. W.

Subjects
RYE, FULVIC acids, CADMIUM, POTASSIUM, SUPEROXIDE dismutase, PHOTOSYNTHETIC rates
Abstract

Freeze-thaw (FT) and cadmium (Cd) are the main ecological stress factors for plant growth in high-latitude regions. Potassium fulvic acid (FAK), a humic acid fertilizer, is widely used and can help plant resist abiotic stresses in farmland ecosystems. Through hydroponic experiments, this study investigated the physiological response characteristics of rye seedlings under FT and Cd compound stress and the potential protective effect of FAK on the rye seedlings. The results demonstrated that FT and Cd compound stress decreased the net photosynthetic rate (Pn) and transpiration rate (Tr) of rye seedlings, and FAK cannot relieve this decrease effectively. However, FAK enhanced the tolerance of rye seedlings to adverse stress, leading to significant increases in peroxidase (POD), superoxide dismutase (SOD), soluble protein (SP), and soluble sugar (SS), and a reduction in malondialdehyde (MDA) content. Therefore, it demonstrated that FAK has a protective effect on rye seedlings in FT and Cd compound stress, reducing the physiological damage to the seedlings. This study provides a theoretical basis for plants in northern high-latitude regions to avoid ecological disasters. [ABSTRACT FROM AUTHOR]

Published
2023
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11. Optimal waist-to-height ratio cutoff values for predicting cardio-metabolic risk in Han and Uygur adults in northwest part of China

Author

He, C.-H., Pan, S., Ma, Y.-T., Yang, Y.-N., Ma, X., Li, X.-M., Xie, X., Chen, Y., Yu, Z.-X., Chen, B.-D., Zheng, Y.-SY., and Liu, F.

Subjects
Body weights and measures -- Health aspects, Metabolic diseases -- Risk factors, Food/cooking/nutrition, Health
Abstract

BACKGROUND/OBJECTIVES: Optimal obesity indices in predicting cardio-metabolic risk are less studied in Asian. We evaluated optimal waist-to-height ratio (WHtR) for predicting hypertension, dyslipidemia and diabetes in Han and Uygur populations in Xinjiang, a northwest part of China. SUBJECTS/METHODS: This study involved 5603 Han and 4657 Uyghur participants. Anthropometric data, blood pressure, serum total cholesterol (TC), triglyceride, low-density lipoprotein, high-density lipoprotein and fasting glucose were determined. The cutoff values of WHtR were calculated;the relation between WHtR and prevalence of cardio-metabolic risks was evaluated. RESULTS: There was a positive correlation between WHtR and blood pressure, TC, triglycerides and fasting glucose in both Han and Uygur participants (all P < 0.001). The prevalence of hypertension, dyslipidemia and diabetes was higher with increased WHtR for both ethnic groups after adjusted by age. Calculated cutoff values of WHtR for predicting hypertension, dyslipidemia, diabetes or [greater than or equal to] 2 of these risk factors were 0.54 for both men and women in Han and 0.55 in male and 0.57 in female Uygur participants. A significant difference in blood pressure, triglycerides and fasting glucose between subgroups with WHtR either above or below the cutoff values was observed in both men and women of the two ethnicities. CONCLUSIONS: The optimal cutoff value of WHtR is a useful screen tool for predicting cardio-metabolic risks in Han and Uygur population in Xinjiang, northwest part of China. European Journal of Clinical Nutrition (2015) 69, 954-960; doi: 10.1038/ejcn.2015.25; published online 18 March 2015, INTRODUCTION It is well known that many chronic diseases, such as hypertension, dyslipidemia and diabetes, are related to increased body fat, which can be evaluated by anthropometric indicators. (1) Obesity [...]

Published
2015
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23. Siponimod versus placebo in secondary progressive multiple sclerosis (EXPAND): a double-blind, randomised, phase 3 study

Author

Kappos, L., Bar-Or, A., Cree, B. A. C., Fox, R. J., Giovannoni, G., Gold, R., Vermersch, P., Arnold, D. L., Arnould, S., Scherz, T., Wolf, C., Wallstrom, E., Dahlke, F., Achiron, A., Achtnichts, L., Agan, K., Akman-Demir, G., Allen, A. B., Antel, J. P., Antiguedad, A. R., Apperson, M., Applebee, A. M., Ayuso, G. I., Baba, M., Bajenaru, O., Balasa, R., Balci, B. P., Barnett, M., Bass, A., Becker, V. U., Bejinariu, M., Bergh, F. T., Bergmann, A., Bernitsas, E., Berthele, A., Bhan, V., Bischof, F., Bjork, R. J., Blevins, G., Boehringer, M., Boerner, T., Bonek, R., Bowen, J. D., Bowling, A., Boyko, A. N., Boz, C., Bracknies, V., Braune, S., Brescia Morra, V., Brochet, B., Brola, W., Brownstone, P. K., Brozman, M., Brunet, D., Buraga, I., Burnett, M., Buttmann, M., Butzkueven, H., Cahill, J., Calkwood, J. C., Camu, W., Cascione, M., Castelnovo, G., Centonze, D., Cerqueira, J., Chan, A., Cimprichova, A., Cohan, S., Comi, G., Conway, J., Cooper, J. A., Corboy, J., Correale, J., Costell, B., Cottrell, D. A., Coyle, P. K., Craner, M., Cui, L., Cunha, L., Czlonkowska, A., da Silva, A. M., de Sa, J., de Seze, J., Debouverie, M., Debruyne, J., Decoo, D., Defer, G., Derfuss, T., Deri, N. H., Dihenia, B., Dioszeghy, P., Donath, V., Dubois, B., Duddy, M., Duquette, P., Edan, G., Efendi, H., Elias, S., Emrich, P. J., Estruch, B. C., Evdoshenko, E. P., Faiss, J., Fedyanin, A. S., Feneberg, W., Fermont, J., Fernandez, O. F., Ferrer, F. C., Fink, K., Ford, H., Ford, C., Francia, A., Freedman, M., Frishberg, B., Galgani, S., Garmany, G. P., Gehring, K., Gitt, J., Gobbi, C., Goldstick, L. P., Gonzalez, R. A., Grandmaison, F., Grigoriadis, N., Grigorova, O., Grimaldi, L. M. E., Gross, J., Gross-Paju, K., Gudesblatt, M., Guillaume, D., Haas, J., Hancinova, V., Hancu, A., Hardiman, O., Harmjanz, A., Heidenreich, F. R., Hengstman, G. J. D., Herbert, J., Herring, M., Hodgkinson, S., Hoffmann, O. M., Hofmann, W. E., Honeycutt, W. D., Hua, L. H., Huang, D., Huang, Y., Hupperts, R., Imre, P., Jacobs, A. K., Jakab, G., Jasinska, E., Kaida, K., Kalnina, J., Kaprelyan, A., Karelis, G., Karussis, D., Katz, A., Khabirov, F. A., Khatri, B., Kimura, T., Kister, I., Kizlaitiene, R., Klimova, E., Koehler, J., Komatineni, A., Kornhuber, A., Kovacs, K., Koves, A., Kozubski, W., Krastev, G., Krupp, L. B., Kurca, E., Lassek, C., Laureys, G., Lee, L., Lensch, E., Leutmezer, F., Li, H., Linker, R. A., Linnebank, M., Liskova, P., Llanera, C., Lu, J., Lutterotti, A., Lycke, J., Macdonell, R., Maciejowski, M., Maeurer, M., Magzhanov, R. V., Maida, E. -M., Malciene, L., Mao-Draayer, Y., Marfia, G. A., Markowitz, C., Mastorodimos, V., Matyas, K., Meca-Lallana, J., Merino, J. A. G., Mihetiu, I. G., Milanov, I., Miller, A. E., Millers, A., Mirabella, M., Mizuno, M., Montalban, X., Montoya, L., Mori, M., Mueller, S., Nakahara, J., Nakatsuji, Y., Newsome, S., Nicholas, R., Nielsen, A. S., Nikfekr, E., Nocentini, U., Nohara, C., Nomura, K., Odinak, M. M., Olsson, T., van Oosten, B. W., Oreja-Guevara, C., Oschmann, P., Overell, J., Pachner, A., Panczel, G., Pandolfo, M., Papeix, C., Patrucco, L., Pelletier, J., Piedrabuena, R., Pless, M., Polzer, U., Pozsegovits, K., Rastenyte, D., Rauer, S., Reifschneider, G., Rey, R., Rizvi, S. A., Robertson, D., Rodriguez, J. M., Rog, D., Roshanisefat, H., Rowe, V., Rozsa, C., Rubin, S., Rusek, S., Sacca, F., Saida, T., Salgado, A. V., Sanchez, V. E. F., Sanders, K., Satori, M., Sazonov, D. V., Scarpini, E. A., Schlegel, E., Schluep, M., Schmidt, S., Scholz, E., Schrijver, H. M., Schwab, M., Schwartz, R., Scott, J., Selmaj, K., Shafer, S., Sharrack, B., Shchukin, I. A., Shimizu, Y., Shotekov, P., Siever, A., Sigel, K. -O., Silliman, S., Simo, M., Simu, M., Sinay, V., Siquier, A. E., Siva, A., Skoda, O., Solomon, A., Stangel, M., Stefoski, D., Steingo, B., Stolyarov, I. D., Stourac, P., Strassburger-Krogias, K., Strauss, E., Stuve, O., Tarnev, I., Tavernarakis, A., Tello, C. R., Terzi, M., Ticha, V., Ticmeanu, M., Tiel-Wilck, K., Toomsoo, T., Tubridy, N., Tullman, M. J., Tumani, H., Turcani, P., Turner, B., Uccelli, A., Urtaza, F. J. O., Vachova, M., Valikovics, A., Walter, S., Van Wijmeersch, B., Vanopdenbosch, L., Weber, J. R., Weiss, S., Weissert, R., West, T., Wiendl, H., Wiertlewski, S., Wildemann, B., Willekens, B., Visser, L. H., Vorobeychik, G., Xu, X., Yamamura, T., Yang, Y. N., Yelamos, S. M., Yeung, M., Zacharias, A., Zelkowitz, M., Zettl, U., Zhang, M., Zhou, H., Zieman, U., Ziemssen, T., Bergmann A., Haas J., Mirabella M. (ORCID:0000-0002-7783-114X), Terzi M., Kappos, L., Bar-Or, A., Cree, B. A. C., Fox, R. J., Giovannoni, G., Gold, R., Vermersch, P., Arnold, D. L., Arnould, S., Scherz, T., Wolf, C., Wallstrom, E., Dahlke, F., Achiron, A., Achtnichts, L., Agan, K., Akman-Demir, G., Allen, A. B., Antel, J. P., Antiguedad, A. R., Apperson, M., Applebee, A. M., Ayuso, G. I., Baba, M., Bajenaru, O., Balasa, R., Balci, B. P., Barnett, M., Bass, A., Becker, V. U., Bejinariu, M., Bergh, F. T., Bergmann, A., Bernitsas, E., Berthele, A., Bhan, V., Bischof, F., Bjork, R. J., Blevins, G., Boehringer, M., Boerner, T., Bonek, R., Bowen, J. D., Bowling, A., Boyko, A. N., Boz, C., Bracknies, V., Braune, S., Brescia Morra, V., Brochet, B., Brola, W., Brownstone, P. K., Brozman, M., Brunet, D., Buraga, I., Burnett, M., Buttmann, M., Butzkueven, H., Cahill, J., Calkwood, J. C., Camu, W., Cascione, M., Castelnovo, G., Centonze, D., Cerqueira, J., Chan, A., Cimprichova, A., Cohan, S., Comi, G., Conway, J., Cooper, J. A., Corboy, J., Correale, J., Costell, B., Cottrell, D. A., Coyle, P. K., Craner, M., Cui, L., Cunha, L., Czlonkowska, A., da Silva, A. M., de Sa, J., de Seze, J., Debouverie, M., Debruyne, J., Decoo, D., Defer, G., Derfuss, T., Deri, N. H., Dihenia, B., Dioszeghy, P., Donath, V., Dubois, B., Duddy, M., Duquette, P., Edan, G., Efendi, H., Elias, S., Emrich, P. J., Estruch, B. C., Evdoshenko, E. P., Faiss, J., Fedyanin, A. S., Feneberg, W., Fermont, J., Fernandez, O. F., Ferrer, F. C., Fink, K., Ford, H., Ford, C., Francia, A., Freedman, M., Frishberg, B., Galgani, S., Garmany, G. P., Gehring, K., Gitt, J., Gobbi, C., Goldstick, L. P., Gonzalez, R. A., Grandmaison, F., Grigoriadis, N., Grigorova, O., Grimaldi, L. M. E., Gross, J., Gross-Paju, K., Gudesblatt, M., Guillaume, D., Haas, J., Hancinova, V., Hancu, A., Hardiman, O., Harmjanz, A., Heidenreich, F. R., Hengstman, G. J. D., Herbert, J., Herring, M., Hodgkinson, S., Hoffmann, O. M., Hofmann, W. E., Honeycutt, W. D., Hua, L. H., Huang, D., Huang, Y., Hupperts, R., Imre, P., Jacobs, A. K., Jakab, G., Jasinska, E., Kaida, K., Kalnina, J., Kaprelyan, A., Karelis, G., Karussis, D., Katz, A., Khabirov, F. A., Khatri, B., Kimura, T., Kister, I., Kizlaitiene, R., Klimova, E., Koehler, J., Komatineni, A., Kornhuber, A., Kovacs, K., Koves, A., Kozubski, W., Krastev, G., Krupp, L. B., Kurca, E., Lassek, C., Laureys, G., Lee, L., Lensch, E., Leutmezer, F., Li, H., Linker, R. A., Linnebank, M., Liskova, P., Llanera, C., Lu, J., Lutterotti, A., Lycke, J., Macdonell, R., Maciejowski, M., Maeurer, M., Magzhanov, R. V., Maida, E. -M., Malciene, L., Mao-Draayer, Y., Marfia, G. A., Markowitz, C., Mastorodimos, V., Matyas, K., Meca-Lallana, J., Merino, J. A. G., Mihetiu, I. G., Milanov, I., Miller, A. E., Millers, A., Mirabella, M., Mizuno, M., Montalban, X., Montoya, L., Mori, M., Mueller, S., Nakahara, J., Nakatsuji, Y., Newsome, S., Nicholas, R., Nielsen, A. S., Nikfekr, E., Nocentini, U., Nohara, C., Nomura, K., Odinak, M. M., Olsson, T., van Oosten, B. W., Oreja-Guevara, C., Oschmann, P., Overell, J., Pachner, A., Panczel, G., Pandolfo, M., Papeix, C., Patrucco, L., Pelletier, J., Piedrabuena, R., Pless, M., Polzer, U., Pozsegovits, K., Rastenyte, D., Rauer, S., Reifschneider, G., Rey, R., Rizvi, S. A., Robertson, D., Rodriguez, J. M., Rog, D., Roshanisefat, H., Rowe, V., Rozsa, C., Rubin, S., Rusek, S., Sacca, F., Saida, T., Salgado, A. V., Sanchez, V. E. F., Sanders, K., Satori, M., Sazonov, D. V., Scarpini, E. A., Schlegel, E., Schluep, M., Schmidt, S., Scholz, E., Schrijver, H. M., Schwab, M., Schwartz, R., Scott, J., Selmaj, K., Shafer, S., Sharrack, B., Shchukin, I. A., Shimizu, Y., Shotekov, P., Siever, A., Sigel, K. -O., Silliman, S., Simo, M., Simu, M., Sinay, V., Siquier, A. E., Siva, A., Skoda, O., Solomon, A., Stangel, M., Stefoski, D., Steingo, B., Stolyarov, I. D., Stourac, P., Strassburger-Krogias, K., Strauss, E., Stuve, O., Tarnev, I., Tavernarakis, A., Tello, C. R., Terzi, M., Ticha, V., Ticmeanu, M., Tiel-Wilck, K., Toomsoo, T., Tubridy, N., Tullman, M. J., Tumani, H., Turcani, P., Turner, B., Uccelli, A., Urtaza, F. J. O., Vachova, M., Valikovics, A., Walter, S., Van Wijmeersch, B., Vanopdenbosch, L., Weber, J. R., Weiss, S., Weissert, R., West, T., Wiendl, H., Wiertlewski, S., Wildemann, B., Willekens, B., Visser, L. H., Vorobeychik, G., Xu, X., Yamamura, T., Yang, Y. N., Yelamos, S. M., Yeung, M., Zacharias, A., Zelkowitz, M., Zettl, U., Zhang, M., Zhou, H., Zieman, U., Ziemssen, T., Bergmann A., Haas J., Mirabella M. (ORCID:0000-0002-7783-114X), and Terzi M.

Abstract

Background: No treatment has consistently shown efficacy in slowing disability progression in patients with secondary progressive multiple sclerosis (SPMS). We assessed the effect of siponimod, a selective sphingosine 1-phosphate (S1P) receptor1,5 modulator, on disability progression in patients with SPMS. Methods: This event-driven and exposure-driven, double-blind, phase 3 trial was done at 292 hospital clinics and specialised multiple sclerosis centres in 31 countries. Using interactive response technology to assign numbers linked to treatment arms, patients (age 18–60 years) with SPMS and an Expanded Disability Status Scale score of 3·0–6·5 were randomly assigned (2:1) to once daily oral siponimod 2 mg or placebo for up to 3 years or until the occurrence of a prespecified number of confirmed disability progression (CDP) events. The primary endpoint was time to 3-month CDP. Efficacy was assessed for the full analysis set (ie, all randomly assigned and treated patients); safety was assessed for the safety set. This trial is registered with ClinicalTrials.gov, number NCT01665144. Findings: 1651 patients were randomly assigned between Feb 5, 2013, and June 2, 2015 (1105 to the siponimod group, and 546 to the placebo group). One patient did not sign the consent form, and five patients did not receive study drug, all of whom were in the siponimod group. 1645 patients were included in the analyses (1099 in the siponimod group and 546 in the placebo). At baseline, the mean time since first multiple sclerosis symptoms was 16·8 years (SD 8·3), and the mean time since conversion to SPMS was 3·8 years (SD 3·5); 1055 (64%) patients had not relapsed in the previous 2 years, and 918 (56%) of 1651 needed walking assistance. 903 (82%) patients receiving siponimod and 424 (78%) patients receiving placebo completed the study. 288 (26%) of 1096 patients receiving siponimod and 173 (32%) of 545 patients receiving placebo had 3-month CDP (hazard ratio 0·79, 95% CI 0·65–0·95; relative

Published
2018

25. Molecular tagging of biocontrol fungus Trichoderma asperellum and its colonization in soil.

Author

Xian, H.‐Q., Liu, L., Li, Y.‐H., Yang, Y.‐N., and Yang, S.

Subjects
GREEN fluorescent protein, TRICHODERMA, SOIL inoculation, SOILS, GENETIC transformation
Abstract

Aims: To conduct molecular tagging of the biocontrol fungus Trichoderma asperellum strain T4 and elucidate its colonization patterns in soil. Methods and Results: We constructed an expression vector harbouring a hygromycin B‐resistant gene (hph) and an efficient green fluorescent protein (egfp) gene. By applying Agrobacterium AGL‐1‐mediated genetic transformation technology, we conducted molecular tagging of T. asperellum and monitored the colonization dynamics of T. asperellum in soil. The results of tracking five independent transformants of T. asperellum indicated that its expansion rates ranged from 4·7 to 6·8 cm week−1. After inoculation in soil, the quantities of T. asperellum could be maintained at over 10 × 104 CFU per gram soil in the first year. In the third year after inoculation, the quantities of T. asperellum in soil were still higher than 1 × 103 CFU per gram soil. In addition, molecularly tagged T. asperellum in soil in the second year (i.e. 12 months) after inoculation could still reach the biocontrol effect on cucumber Rhizoctonia rot by more than 74%. Conclusion: Trichoderma asperellum strain T4 is capable of effectively colonizing in soil and surviving for more than 1 year. Significance and Impact of the Study: This study has provided the scientific basis for applying T. asperellum as the biocontrol fungus for prevention and control of plant diseases. [ABSTRACT FROM AUTHOR]

Published
2020
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30. Disordering of the (3x1) reconstruction on Si(113) and the chiral three-state Potts model

Author

Yang, Y.-N., Yang, Y.-N., Williams, Ellen D., Park, R. L., Bartelt, N. C., Einstein, Theodore L., Yang, Y.-N., Yang, Y.-N., Williams, Ellen D., Park, R. L., Bartelt, N. C., and Einstein, Theodore L.

Abstract

We have used high-resolution low-energy electron diffraction to study the disordering of the (3x1) reconstruction on Si(113). We find that the reconstruction disorders via a continuous transition at approximately 850 K. Above the transition temperature the positions of the superlattice diffraction beams shift away from their commensurate positions. The shift is proportional to the broadening of the beams, as expected from basic scaling arguments for a system in the chiral three-state Potts-model universality class.

Published
1990

31. High glucose concentration abrogates sevoflurane post-conditioning cardioprotection by advancing mitochondrial fission but dynamin-related protein 1 inhibitor restores these effects.

Author

Yu, J., Maimaitili, Y., Xie, P., Wu, J. J., Wang, J., Yang, Y. N., Ma, H. P., and Zheng, H.

Subjects
PEOPLE with diabetes, GLUCOSE metabolism, CELLS, HYPOXEMIA, SEVOFLURANE, WOUNDS & injuries
Abstract

Aim Hyperglycaemia-induced cell injury is a primary cause of cardiovascular complications in patients with diabetes. In vivo studies demonstrated that sevoflurane post-conditioning (SpostC) was cardioprotective against ischaemia/reperfusion injury, which was blocked by hyperglycaemia. This study investigated whether high glucose concentration abrogated SpostC cardioprotection in vitro by advancing mitochondrial fission and whether mitochondrial division inhibitor-1 (Mdivi-1) restored SpostC cardioprotection in cultured primary neonatal rat cardiomyocytes ( NCMs). Methods Primary cultured NCMs in low and high glucose concentrations were subjected to hypoxia/reoxygenation (H/R) injury. SpostC was carried out by adding 2.4% sevoflurane to the cells at the beginning of reoxygenation for 15 min. Cell viability, lactate dehydrogenase ( LDH) level, cell death, mitochondrial morphology, mitochondrial membrane potential and mitochondrial permeability transition pore ( mPTP) opening level, as well as fission- and fusion-related proteins, were measured after H/R injury. Mdivi-1 treatment was performed 40 min before hypoxia to inhibit DRP1. Results SpostC protected cultured cardiomyocytes by increasing cell viability and reducing the LDH level and cell death following H/R, but high glucose concentration eliminated the cardioprotective effect. High glucose concentration abrogated SpostC cardioprotection via mitochondrial fragmentation (evidenced by decreased mitochondrial interconnectivity and elongation) and facilitation of mPTP opening. Decreased mitochondrial membrane potential was investigated with increased DRP1, FIS1 and MFN2 and decreased MFN1 and OPA1 expressions. Mdivi-1 (100 μmol L−1) inhibited excessive mitochondrial fission and restored the cardioprotective effect of SpostC in high glucose conditions. Conclusion SpostC-induced cardioprotection against H/R injury was impaired under high glucose concentrations, but the inhibition of excess mitochondrial fission restored these effects. [ABSTRACT FROM AUTHOR]

Published
2017
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32. DNA DAMAGE IN JUVENILE GOLDFISH AS A BIOLOGICAL INDICATOR OF ESTUARINE OIL POLLUTION.

Author

YANG, Y. N., GONG, H. J., and BASHIR, MUHAMMAD AAMIR

Subjects
BIOINDICATORS, DNA damage, ESTUARINE pollution, POLLUTANTS, GOLDFISH, BP Deepwater Horizon Explosion & Oil Spill, 2010, OIL spills
Abstract

The article discusses that oil spills in estuarine areas of China have increased in recent years. It mentions that monitoring environmental quality is needed after an oil spill occurs; and also mentions the certain components of oil in the living body are excreted easily during routine metabolism of the organism.

Published
2019

38. Metastable Reconstructions on Si(111)

Author

Yang, Y. -N. and Williams, E. D.

Subjects
surface reconstruction, scanning tunneling microscopy (STM), surface energy, silicon, Biology, homo-epitaxy, Si(111), electromigration
Abstract

We report unambiguous atomic scale evidence demonstrating that the atom density in the high temperature "1x1" phase of Si(111) is ~6% higher than the 7x7. Such evidence is provided by scanning tunneling microscopy (STM) observation of excess adatom density, and related island formation, on surfaces with very large terraces. The unusually large terraces were produced by heating the sample with DC current in the step-down direction at 1200°C. By trapping adatoms on the terraces through a quench, we have also created areas of metastable reconstructions, i.e., 9x9, 2x2, c2x4 and √3x√3, much larger than previously reported. For the first time, we have demonstrated the existence of metastable 11x11, 13x13 and c2x8 on Si(111). We have found that the c2x8 reconstruction can be stabilized as well as other members of the 2x2/c2x4/c2x8 family of reconstructions. An energetic model, based on the idea of atomic conservation, is proposed for the formation of the observed high atom density metastable reconstructions.

Published
1994

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