1
|
Bian RH, Huang SX, Zhu JY, Wu J, Fan KW, Hu ZC, Xu YB, Yu QH, Zhang T, Li XY, Chen SZ. [Establishment of a topographic map assessment system for facial and cervical wounds and scars of burn patients based on the Delphi method]. Zhonghua Shao Shang Yu Chuang Mian Xiu Fu Za Zhi 2023; 39:1115-1121. [PMID: 38129297 DOI: 10.3760/cma.j.cn501225-20230905-00075] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 12/23/2023]
Abstract
Objective: To construct a targeted and accurate evaluation system for facial and cervical wounds and scars of burn patients. Methods: The method combining literature analysis and survey research was adopted, and the basic principles of item system construction were followed. From June to August 2020, based on the aesthetic standards of facial and cervical plastic surgery, the topographic map assessment system for facial and cervical wounds and scars of burn patients was preliminarily formed, focusing on the assessment of wounds and scars in the necks and faces of patients after burns. In September 2020, 38 experts in the relevant fields were consulted in advance and the questionnaire was revised according to the experts' opinions. From December 2020 to March 2021, the Delphi method was applied to conduct inquiry by correspondence with 35 experts in relevant fields from Guangzhou, Shenzhen, Shanghai, Beijing, and other cities, who met the inclusion criteria, and the items were screened and established. The effective recovery rate of inquiry questionnaire was calculated to determine the level of enthusiasm of experts, the average authority coefficient of all items was calculated to determine the level of expert authority, the average importance expert score, the average coefficient of variation, and the average full score rate of all the third-level items were calculated to determine the concentration of expert opinions, the average coefficients of variation and Kendall's harmony coefficients of the importance, sensitivity, and operability expert scores of all the third-level items were calculated to determine the degree of coordination of expert opinions. The Kendall's harmony coefficients for the importance, sensitivity, and operability expert scores of all the third-level items were statistically analyzed with chi-square test. Results: Among the 35 experts consulted by Delphi method, mainly were male, aged (48±10) years, with 8-38 years of working experience, mainly with associate senior titles and above, all with a bachelor's degree or above education background, and of whom 11 were burn experts, 7 were wound repair experts, 4 were plastic surgery experts, and 13 were rehabilitation medicine experts. Finally, a topographic map assessment system for facial and cervical wounds and scars of burn patients was formed, including 4 first-level items, 21 second-level items, 40 third-level items, and 1 mask. The effective recovery rate of inquiry questionnaire was 100% (35/35). The average authority coefficient of all items was 0.89. The average importance expert score was 4.67, the average coefficient of variation of importance expert score was 0.01, and the average full score rate of all the third-level items was 86.3%. The average coefficients of variation of the importance, sensitivity, and operability expert scores of all the third-level items were 0.01, 0.01, and 0.02, respectively. The Kendall's harmony coefficients for the importance, sensitivity, and operability expert scores of all the third-level items were statistically significant (with χ2 values of 1 201.53, 745.67, and 707.07, respectively, P<0.05). Conclusions: The established topographic map assessment system for facial and cervical wounds and scars of burn patients has high scientificity and reliability, which can be used for the evaluation of facial and neck wounds or scars in burn patients.
Collapse
Affiliation(s)
- R H Bian
- Department of Rehabilitation Medicine, the First Affiliated Hospital, Sun Yat-sen University, Guangzhou 510080, China
| | - S X Huang
- Department of Burns and Wound Repair Surgery, the First Affiliated Hospital, Sun Yat-sen University, Guangzhou 510080, China
| | - J Y Zhu
- Department of Burns and Wound Repair Surgery, the First Affiliated Hospital, Sun Yat-sen University, Guangzhou 510080, China
| | - J Wu
- Department of Burns and Plastic Surgery, the First Affiliated Hospital, Shenzhen University, Shenzhen 518035, China
| | - K W Fan
- Department of Burns and Plastic Surgery, the First Affiliated Hospital, Shenzhen University, Shenzhen 518035, China
| | - Z C Hu
- Department of Burns and Wound Repair Surgery, the First Affiliated Hospital, Sun Yat-sen University, Guangzhou 510080, China
| | - Y B Xu
- Department of Burns and Wound Repair Surgery, the First Affiliated Hospital, Sun Yat-sen University, Guangzhou 510080, China
| | - Q H Yu
- Department of Rehabilitation Medicine, the First Affiliated Hospital, Sun Yat-sen University, Guangzhou 510080, China
| | - T Zhang
- Department of Rehabilitation Medicine, the First Affiliated Hospital, Sun Yat-sen University, Guangzhou 510080, China
| | - X Y Li
- Department of Rehabilitation Medicine, the First Affiliated Hospital, Sun Yat-sen University, Guangzhou 510080, China
| | - S Z Chen
- Department of Rehabilitation Medicine, the First Affiliated Hospital, Sun Yat-sen University, Guangzhou 510080, China
| |
Collapse
|
2
|
Xie LY, Xu YB, Ding XQ, Liang S, Li DL, Fu AK, Zhan XA. Itaconic acid and dimethyl itaconate exert antibacterial activity in carbon-enriched environments through the TCA cycle. Biomed Pharmacother 2023; 167:115487. [PMID: 37713987 DOI: 10.1016/j.biopha.2023.115487] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/09/2023] [Revised: 09/08/2023] [Accepted: 09/08/2023] [Indexed: 09/17/2023] Open
Abstract
Itaconic acid (IA), a metabolite generated by the tricarboxylic acid (TCA) cycle in eukaryotic immune cells, and its derivative dimethyl itaconate (DI) exert antibacterial functions in intracellular environments. Previous studies suggested that IA and DI only inhibit bacterial growth in carbon-limited environments; however, whether IA and DI maintain antibacterial activity in carbon-enriched environments remains unknown. Here, IA and DI inhibited the bacteria with minimum inhibitory concentrations of 24.02 mM and 39.52 mM, respectively, in a carbon-enriched environment. The reduced bacterial pathogenicity was reflected in cell membrane integrity, motility, biofilm formation, AI-2/luxS, and virulence. Mechanistically, succinate dehydrogenase (SDH) activity and fumaric acid levels decreased in the IA and DI treatments, while isocitrate lyase (ICL) activity was upregulated. Inhibited TCA circulation was also observed through untargeted metabolomics. In addition, energy-related aspartate metabolism and lysine degradation were suppressed. In summary, these results indicated that IA and DI reduced bacterial pathogenicity while exerting antibacterial functions by inhibiting TCA circulation. This study enriches knowledge on the inhibition of bacteria by IA and DI in a carbon-mixed environment, suggesting an alternative method for treating bacterial infections by immune metabolites.
Collapse
Affiliation(s)
- L Y Xie
- Key Laboratory of Animal Nutrition and Feed in East China, Ministry of Agriculture and Key Laboratory of Animal Feed and Nutrition of Zhejiang Province, Feed Science Institute, College of Animal Science, Zhejiang University, Hangzhou 310058, China
| | - Y B Xu
- Key Laboratory of Animal Nutrition and Feed in East China, Ministry of Agriculture and Key Laboratory of Animal Feed and Nutrition of Zhejiang Province, Feed Science Institute, College of Animal Science, Zhejiang University, Hangzhou 310058, China
| | - X Q Ding
- Key Laboratory of Animal Nutrition and Feed in East China, Ministry of Agriculture and Key Laboratory of Animal Feed and Nutrition of Zhejiang Province, Feed Science Institute, College of Animal Science, Zhejiang University, Hangzhou 310058, China
| | - S Liang
- Key Laboratory of Animal Nutrition and Feed in East China, Ministry of Agriculture and Key Laboratory of Animal Feed and Nutrition of Zhejiang Province, Feed Science Institute, College of Animal Science, Zhejiang University, Hangzhou 310058, China
| | - D L Li
- Key Laboratory of Animal Nutrition and Feed in East China, Ministry of Agriculture and Key Laboratory of Animal Feed and Nutrition of Zhejiang Province, Feed Science Institute, College of Animal Science, Zhejiang University, Hangzhou 310058, China
| | - A K Fu
- Key Laboratory of Animal Nutrition and Feed in East China, Ministry of Agriculture and Key Laboratory of Animal Feed and Nutrition of Zhejiang Province, Feed Science Institute, College of Animal Science, Zhejiang University, Hangzhou 310058, China
| | - X A Zhan
- Key Laboratory of Animal Nutrition and Feed in East China, Ministry of Agriculture and Key Laboratory of Animal Feed and Nutrition of Zhejiang Province, Feed Science Institute, College of Animal Science, Zhejiang University, Hangzhou 310058, China.
| |
Collapse
|
3
|
Zhu XN, He TY, Luo SL, Huang YY, Xu YB, Liu SL, Yang J. [Refractory macrophage activation syndrome in children with systemic onset juvenile idiopathic arthritis treated with canakinumab]. Zhonghua Er Ke Za Zhi 2023; 61:842-844. [PMID: 37650168 DOI: 10.3760/cma.j.cn112140-20230220-00114] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 09/01/2023]
Affiliation(s)
- X N Zhu
- Department of Rheumatology and Immunology, Shenzhen Children's Hospital, Shenzhen 518038, China
| | - T Y He
- Department of Rheumatology and Immunology, Shenzhen Children's Hospital, Shenzhen 518038, China
| | - S L Luo
- Department of Rheumatology and Immunology, Shenzhen Children's Hospital, Shenzhen 518038, China
| | - Y Y Huang
- Department of Rheumatology and Immunology, Shenzhen Children's Hospital, Shenzhen 518038, China
| | - Y B Xu
- Department of Rheumatology and Immunology, Shenzhen Children's Hospital, Shenzhen 518038, China
| | - S L Liu
- Department of Hematology and Oncology, Shenzhen Children's Hospital, Shenzhen 518038, China
| | - J Yang
- Department of Rheumatology and Immunology, Shenzhen Children's Hospital, Shenzhen 518038, China
| |
Collapse
|
4
|
Zhou QF, Luo Y, He TY, Ling JY, Xu YB, Yang J, Xia Y. [Analysis of the clinical characteristics and therapeutic effect of refractory juvenile dermatomyositis to tofacitinib]. Zhonghua Er Ke Za Zhi 2023; 61:538-542. [PMID: 37312466 DOI: 10.3760/cma.j.cn112140-20221128-01009] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Subscribe] [Scholar Register] [Indexed: 06/15/2023]
Abstract
Objective: To elucidate the clinical features of patients with refractory juvenile dermatomyositis (JDM), and to explore the efficacy and safety of tofacitinib in the treatment of refractory JDM. Methods: A total of 75 JDM patients admitted to the Department of Rheumatology and Immunology in Shenzhen Children's Hospital from January 2012 to January 2021 were retrospectively analyzed, and to analyze the clinical manifestations, efficacy and safety of tofacitinib in the treatment of refractory JDM. Patients were divided into refractory group with using of glucocorticoids in combination with two or more anti-rheumatic drugs for treatment, and the presence of disease activity or steroid dependence after a one-year follow-up. The non-refractory group is defined as clinical symptoms disappeared, laboratory indicators were normal, and clinical remission was achieved after initial treatment, and the clinical manifestations and laboratory indexes of the two groups were compared. The Mann-Whitney U test, Fisher's precision probability test was used for intergroup comparison. Binary Logistic multivariate regression analysis was used to identify risk factors for refractory JDM. Results: Among the 75 children with JDM, 41 were males and 34 were females with a age of onset of 5.3 (2.3, 7.8) years. The refractory group consisted of 27 cases with a age of onset of 4.4 (1.5, 6.8) years, while the non-refractory group consisted of 48 cases with a age of onset of 5.9 (2.5, 8.0) years. Compared with 48 cases in the non-refractory group, the proportion of interstitial lesions and calcinosis in the refractory group was higher than that in the non-refractory group (6 cases (22%) vs. 2 cases (4%), 8 cases (30%) vs. 4 cases (8%), both P<0.05). Binary Logistic regression analysis showed that observation group were more likely to be associated with to interstitial lung disease (OR=6.57, 95%CI 1.22-35.31, P=0.028) and calcinosis (OR=4.63, 95%CI 1.24-17.25, P=0.022). Among the 27 patients in the refractory group, 22 cases were treated with tofacitinib, after treatment with tofacitinib, 15 of 19 cases (86%) children with rashes showed improvement, and 6 cases (27%) with myositis evaluation table score less than 48 score both were improved, 3 of 6 cases (27%) had calcinosis were relieved, and 2 cases (9%) had glucocorticoid-dependence children were successfully weaned off. During the tofacitinib treatment, there was no increase in recurrent infection, blood lipids, liver enzymes, and creatinine were all normal in the 22 cases. Conclusions: Children with JDM with calcinosis and interstitial lung disease are more likely to develop refractory JDM. Tofacitinib is safe and effective for refractory JDM.
Collapse
Affiliation(s)
- Q F Zhou
- Department of Rheumatology and Immunology, Shenzhen Children's hospital, Shenzhen 518038, China
| | - Y Luo
- Department of Rheumatology and Immunology, Shenzhen Children's hospital, Shenzhen 518038, China
| | - T Y He
- Department of Rheumatology and Immunology, Shenzhen Children's hospital, Shenzhen 518038, China
| | - J Y Ling
- Department of Rheumatology and Immunology, Shenzhen Children's hospital, Shenzhen 518038, China
| | - Y B Xu
- Department of Rheumatology and Immunology, Shenzhen Children's hospital, Shenzhen 518038, China
| | - J Yang
- Department of Rheumatology and Immunology, Shenzhen Children's hospital, Shenzhen 518038, China
| | - Y Xia
- Department of Rheumatology and Immunology, Shenzhen Children's hospital, Shenzhen 518038, China
| |
Collapse
|
5
|
Liu JX, Wei Y, Zhou JH, Wang J, Song HC, Li XW, Xiang CZ, Xu YB, Ding C, Zhong ZY, Zhang Z, Luo YF, Zhao F, Chen C, Pi JB. [Association of hs-CRP with frailty and its components among the elderly over 65 years old in 9 longevity areas of China]. Zhonghua Yu Fang Yi Xue Za Zhi 2023; 57:626-633. [PMID: 37165809 DOI: 10.3760/cma.j.cn112150-20221202-01171] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Grants] [Subscribe] [Scholar Register] [Indexed: 05/12/2023]
Abstract
Objective: To investigate the association of the levels of high sensitivity C-reactive protein (hs-CRP) with frailty and its components among the elderly over 65 years old in 9 longevity areas of China. Methods: Cross-sectional data from the Health Ageing and Biomarkers Cohort Study (HABCS, 2017-2018) were used and the elderly over 65 years old were included in this study. Through questionnaire interview and physical examination, the information including demographic characteristics, behavior, diet, daily activity, cognitive function, and health status was collected. The association between hs-CRP and frailty and its components in the participants was analyzed by multivariate logistic regression model and restrictive cubic spline. Results: A total of 2 453 participants were finally included, the age was (84.8±19.8) years old. The median hs-CRP level was 1.13 mg/L and the prevalence of frailty was 24.4%. Compared with the low-level group (hs-CRP<1.0 mg/L), the OR (95%CI) value of the high-level group (hs-CRP>3.0 mg/L) was 1.79 (1.35-2.36) mg/L. As for the components, the hs-CRP level was also positively associated with ADL disability, IADL disability, functional limitation and multimorbidity. After adjusting for confounding factors, compared with the low-level group, the OR (95%CI) values of the high-level group for the four components were 1.68 (1.25-2.27), 1.88 (1.42-2.50), 1.68 (1.31-2.14) and 1.39 (1.12-1.72), respectively. Conclusion: There is a positive association between the levels of hs-CRP and the risk of frailty among the elderly over 65 years old in 9 longevity areas of China. The higher hs-CRP level may increase the risk of frailty by elevating the risk of four physical functional disabilities, namely ADL disability, IADL disability, functional limitation and multimorbidity.
Collapse
Affiliation(s)
- J X Liu
- China CDC Key Laboratory of Environment and Population Health/National Institute of Environmental Health, Chinese Center for Disease Control and Prevention, Beijing 100021, China School of Public Health, China Medical University, Shenyang 110001, China
| | - Y Wei
- China CDC Key Laboratory of Environment and Population Health/National Institute of Environmental Health, Chinese Center for Disease Control and Prevention, Beijing 100021, China
| | - J H Zhou
- China CDC Key Laboratory of Environment and Population Health/National Institute of Environmental Health, Chinese Center for Disease Control and Prevention, Beijing 100021, China
| | - J Wang
- China CDC Key Laboratory of Environment and Population Health/National Institute of Environmental Health, Chinese Center for Disease Control and Prevention, Beijing 100021, China
| | - H C Song
- China CDC Key Laboratory of Environment and Population Health/National Institute of Environmental Health, Chinese Center for Disease Control and Prevention, Beijing 100021, China
| | - X W Li
- China CDC Key Laboratory of Environment and Population Health/National Institute of Environmental Health, Chinese Center for Disease Control and Prevention, Beijing 100021, China
| | - C Z Xiang
- China CDC Key Laboratory of Environment and Population Health/National Institute of Environmental Health, Chinese Center for Disease Control and Prevention, Beijing 100021, China School of Public Health, China Medical University, Shenyang 110001, China
| | - Y B Xu
- China CDC Key Laboratory of Environment and Population Health/National Institute of Environmental Health, Chinese Center for Disease Control and Prevention, Beijing 100021, China School of Public Health, China Medical University, Shenyang 110001, China
| | - C Ding
- China CDC Key Laboratory of Environment and Population Health/National Institute of Environmental Health, Chinese Center for Disease Control and Prevention, Beijing 100021, China
| | - Z Y Zhong
- School of Public Health, China Medical University, Shenyang 110001, China
| | - Z Zhang
- China CDC Key Laboratory of Environment and Population Health/National Institute of Environmental Health, Chinese Center for Disease Control and Prevention, Beijing 100021, China
| | - Y F Luo
- China CDC Key Laboratory of Environment and Population Health/National Institute of Environmental Health, Chinese Center for Disease Control and Prevention, Beijing 100021, China
| | - F Zhao
- China CDC Key Laboratory of Environment and Population Health/National Institute of Environmental Health, Chinese Center for Disease Control and Prevention, Beijing 100021, China
| | - C Chen
- China CDC Key Laboratory of Environment and Population Health/National Institute of Environmental Health, Chinese Center for Disease Control and Prevention, Beijing 100021, China
| | - J B Pi
- School of Public Health, China Medical University, Shenyang 110001, China
| |
Collapse
|
6
|
Xu YB, Li DL, Ding XQ, Wang YY, Liang S, Xie LY, Zhang YF, Fu AK, Yu WQ, Zhan XA. Probiotic characterization and comparison of broiler-derived lactobacillus strains based on technique for order preference by similarity to ideal solution analysis. Poult Sci 2023; 102:102564. [PMID: 36907127 PMCID: PMC10014310 DOI: 10.1016/j.psj.2023.102564] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/09/2022] [Revised: 02/01/2023] [Accepted: 02/01/2023] [Indexed: 02/10/2023] Open
Abstract
A total of 10 lactobacillus strains were isolated from broiler chickens and their probiotic properties including tolerance to gastrointestinal fluids and heat treatment, antimicrobial activity, adhesion capacity to intestinal cells, surface hydrophobicity, autoaggregation, antioxidative activity, and immunomodulatory effects on chicken macrophages were evaluated. The Limosilactobacillus reuteri (LR) was the most frequently isolated species, followed by Lactobacillus johnsonii (LJ) and Ligilactobacillus salivarius (LS). All isolates showed good resistance to simulated gastrointestinal conditions and antimicrobial activity against 4 indicator strains including Escherichia coli, Salmonella typhimurium, Klebsiella pneumoniae, and Proteus mirabilis LR 21 exhibited excellent performances on autoaggregation, hydrophobicity and adhesion capacity to Caco-2 intestinal cells. In the meantime, this strain also possessed considerable tolerance to heat treatment, which indicated great potential to be used in the feed industry. However, LJ 20 strain had the highest free radical scavenging activity compared with the other strains. Furthermore, qRT-PCR results revealed that all isolated strains significantly increased the transcriptional levels of proinflammatory genes and tended to induce the M1-type polarization on HD11 macrophages. Particularly, the technique for order preference by similarity to ideal solution (TOPSIS) was adopted in our study to compare and select the most promising probiotic candidate based on in vitro evaluation tests.
Collapse
Affiliation(s)
- Y B Xu
- Key Laboratory of Animal Nutrition and Feed in East China, Ministry of Agriculture and Key Laboratory of Animal Feed and Nutrition of Zhejiang Province, Feed Science Institute, College of Animal Science, Zhejiang University (Zijingang Campus), Hangzhou 310058, China
| | - D L Li
- Key Laboratory of Animal Nutrition and Feed in East China, Ministry of Agriculture and Key Laboratory of Animal Feed and Nutrition of Zhejiang Province, Feed Science Institute, College of Animal Science, Zhejiang University (Zijingang Campus), Hangzhou 310058, China; Hainan Institute, Zhejiang University, Yazhou Bay Sci-Tech City, Sanya 572000, China
| | - X Q Ding
- Key Laboratory of Animal Nutrition and Feed in East China, Ministry of Agriculture and Key Laboratory of Animal Feed and Nutrition of Zhejiang Province, Feed Science Institute, College of Animal Science, Zhejiang University (Zijingang Campus), Hangzhou 310058, China
| | - Y Y Wang
- Key Laboratory of Animal Nutrition and Feed in East China, Ministry of Agriculture and Key Laboratory of Animal Feed and Nutrition of Zhejiang Province, Feed Science Institute, College of Animal Science, Zhejiang University (Zijingang Campus), Hangzhou 310058, China
| | - S Liang
- Key Laboratory of Animal Nutrition and Feed in East China, Ministry of Agriculture and Key Laboratory of Animal Feed and Nutrition of Zhejiang Province, Feed Science Institute, College of Animal Science, Zhejiang University (Zijingang Campus), Hangzhou 310058, China
| | - L Y Xie
- Key Laboratory of Animal Nutrition and Feed in East China, Ministry of Agriculture and Key Laboratory of Animal Feed and Nutrition of Zhejiang Province, Feed Science Institute, College of Animal Science, Zhejiang University (Zijingang Campus), Hangzhou 310058, China
| | - Y F Zhang
- Key Laboratory of Animal Nutrition and Feed in East China, Ministry of Agriculture and Key Laboratory of Animal Feed and Nutrition of Zhejiang Province, Feed Science Institute, College of Animal Science, Zhejiang University (Zijingang Campus), Hangzhou 310058, China
| | - A K Fu
- Key Laboratory of Animal Nutrition and Feed in East China, Ministry of Agriculture and Key Laboratory of Animal Feed and Nutrition of Zhejiang Province, Feed Science Institute, College of Animal Science, Zhejiang University (Zijingang Campus), Hangzhou 310058, China
| | - W Q Yu
- Animal Husbandry and Veterinary Services Center of Haiyan, Jiaxing 314300, China
| | - X A Zhan
- Key Laboratory of Animal Nutrition and Feed in East China, Ministry of Agriculture and Key Laboratory of Animal Feed and Nutrition of Zhejiang Province, Feed Science Institute, College of Animal Science, Zhejiang University (Zijingang Campus), Hangzhou 310058, China.
| |
Collapse
|
7
|
Khalid S, Riaz S, Naeem S, Akbar A, Sajjad Hussain S, Xu YB, Naseem S. Spin polarization and magneto-dielectric coupling in Al-modified thin iron oxide films -microwave mediated sol-gel approach. J IND ENG CHEM 2021. [DOI: 10.1016/j.jiec.2021.06.028] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
|
8
|
Wang JS, Hu HJ, Xu YB, Wang DC, Jiang L, Li KX, Wang YY, Zhan XA. Effects of posthatch feed deprivation on residual yolk absorption, macronutrients synthesis, and organ development in broiler chicks. Poult Sci 2020; 99:5587-5597. [PMID: 33142476 PMCID: PMC7647868 DOI: 10.1016/j.psj.2020.08.032] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/03/2020] [Revised: 07/20/2020] [Accepted: 08/06/2020] [Indexed: 12/23/2022] Open
Abstract
The aim of the research was to evaluate the dynamic changes of early posthatch starvation on residual yolk absorption, synthesis of macronutrients (protein, lipid, and glycogen), and organ development in broiler chicks. A total of 720 1-day-old chicks (Lingnan Yellow) were randomly assigned to 3 treatments: group A (nonfasted), group B (fasting for 24 h after placement), and group C (fasting for 48 h after placement). The trial lasted for 168 h, and water was provided ad libitum all the time. Sampling was performed at 0, 24, 48, 72, 120, and 168 h. Nonfasting (group A) promoted (P < 0.05) the absorption of amino acids, fatty acids, mineral elements, protein, and maternal antibody in the residual yolk of broiler chicks. The concentration of insulin-like growth factor 1 in plasma and the liver was higher (P < 0.05) in group A. Nonfasting enhanced (P < 0.05) the synthesis of protein and glycogen in the breast muscle and liver; the relative weights of the liver, pancreas, and spleen; and body weight, but retarded (P < 0.05) the synthesis of triglyceride in the liver. The results indicated that nonfasting (group A) after placement promoted the absorption of residual yolk and synthesis of protein and glycogen in the breast muscle and liver, whereas early feed deprivation promoted the synthesis of lipid in the liver. Thereby, nonfasting after placement promoted organ development and body growth of broiler chicks.
Collapse
Affiliation(s)
- J S Wang
- Feed Science Institute, College of Animal Science, Zhejiang University, Hangzhou 310058, China
| | - H J Hu
- Qingdao Vland Biotech Inc., Qingdao 266000, China
| | - Y B Xu
- Feed Science Institute, College of Animal Science, Zhejiang University, Hangzhou 310058, China
| | - D C Wang
- Feed Science Institute, College of Animal Science, Zhejiang University, Hangzhou 310058, China
| | - L Jiang
- Feed Science Institute, College of Animal Science, Zhejiang University, Hangzhou 310058, China
| | - K X Li
- Feed Science Institute, College of Animal Science, Zhejiang University, Hangzhou 310058, China
| | - Y Y Wang
- Feed Science Institute, College of Animal Science, Zhejiang University, Hangzhou 310058, China
| | - X A Zhan
- Feed Science Institute, College of Animal Science, Zhejiang University, Hangzhou 310058, China.
| |
Collapse
|
9
|
Xu YB, Ouyang Y, Zhao D. Curative effects of vancomycin and cefotaxime combined with gamma globulin respectively in neonatal septicemia and their influences on PCT, CRP and hs-CRP. Eur Rev Med Pharmacol Sci 2020; 24:4486-4494. [PMID: 32373986 DOI: 10.26355/eurrev_202004_21031] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Abstract
OBJECTIVE To explore the curative effects of vancomycin and cefotaxime combined with gamma globulin respectively in neonatal septicemia and their influences on PCT, CRP, and hs-CRP, so as to provide references for clinical treatment. PATIENTS AND METHODS 181 patients with neonatal septicemia admitted to Huangshi Maternity and Child Health Hospital from April 2012 to August 2014 were selected as the study subjects. Patients treated with vancomycin combined with gamma globulin were selected as group A (96 cases) and those treated with cefotaxime combined with gamma globulin were selected as group B (85 cases). The improvement time of clinical symptoms (milk rejection, nervous system symptoms, body temperature), hospital stays, mortality, medicine curative effects, adverse reactions, complications, and levels of serum CRP, PCT, and hs-CRP of patients before and after treatment were compared between the two groups. RESULTS The improvement time of clinical symptoms like body temperature, milk rejection, and neurological symptoms, as well as hospital stays in group A were lower than those in group B (p<0.05); the total effective rate of medicine curative effects in group B was better than that in group A (p<0.05); there was no significant difference in levels of serum CRP, PCT, and hs-CRP between the two groups before treatment (p>0.05); after treatment, levels of serum CRP, PCT, and hs-CRP in both groups decreased significantly, and levels of serum CRP, PCT, and hs-CRP in group B decreased more significantly than those in group A (p<0.05). CONCLUSIONS Cefotaxime combined with gamma globulin in the treatment of patients with neonatal septicemia has short improvement time in clinical symptoms, high total effective rate of drugs, low mortality, fewer adverse reactions and complications, and can significantly reduce levels of serum CRP, PCT, and hs-CRP, which is worthy of further promotion and application in clinical practice.
Collapse
Affiliation(s)
- Y-B Xu
- Department of Neonatology, Huangshi Maternity and Child Health Hospital, Huangshi, P.R. China.
| | | | | |
Collapse
|
10
|
Suriyaprakash J, Xu YB, Zhu YL, Yang LX, Tang YL, Wang YJ, Li S, Ma XL. Designing of metallic nanocrystals embedded in non-stoichiometric perovskite nanomaterial and its surface-electronic characteristics. Sci Rep 2017; 7:8343. [PMID: 28827672 PMCID: PMC5567205 DOI: 10.1038/s41598-017-09031-5] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/04/2017] [Accepted: 07/20/2017] [Indexed: 11/17/2022] Open
Abstract
Engineering of novel functional nanocomposite as like as the metallic nanocrystals supported non-stoichiometric perovskite nanomaterial in controlled parameters (size, shape and ratio of chemical characteristics) is a challengeable task. In this context, we present a facile route to fabricate and study its physicochemical property at real time mode in this report. Nanoscale pure Pb crystals surfaced on non-stoichiometric A-site deficient Pb1-xTiO3-y nanoparticle were fabricated when a precursor lead titanate (PbTiO3) nanoparticle was exposed to an electron beam irradiation (EBI) in a transmission electron microscope (TEM) at ambient temperature. In the state of the art, the chemical states and electronic structure of non-irradiated and irradiated PbTiO3 were studied by X-ray photoelectron spectroscopy (XPS). Electron bombardment resulted in a new visible feature at low binding energy in the Pb 4f core level, while Ti 2p and O 1s line shape showed slight changes. The Fermi level of the corresponding materials was determined to be 1.65 ± 0.1 eV and 2.05 ± 0.1 eV above the valence band maximum, respectively. The normal, weakly p-type PTO exhibits peculiar n-type feature after EBI process (The Fermi level moves near to the conduction band). A feasible mechanism is proposed involving the electron-stimulated local bond-breaking phenomenon in PbTiO3.
Collapse
Affiliation(s)
- Jagadeesh Suriyaprakash
- Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences, 72 Wenhua Road, 110016, Shenyang, China.,University of Chinese Academy of Sciences, 100039, Beijing, China
| | - Y B Xu
- Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences, 72 Wenhua Road, 110016, Shenyang, China
| | - Y L Zhu
- Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences, 72 Wenhua Road, 110016, Shenyang, China
| | - L X Yang
- Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences, 72 Wenhua Road, 110016, Shenyang, China
| | - Y L Tang
- Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences, 72 Wenhua Road, 110016, Shenyang, China
| | - Y J Wang
- Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences, 72 Wenhua Road, 110016, Shenyang, China
| | - S Li
- Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences, 72 Wenhua Road, 110016, Shenyang, China.,University of Chinese Academy of Sciences, 100039, Beijing, China
| | - X L Ma
- Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences, 72 Wenhua Road, 110016, Shenyang, China. .,State Key Laboratory of Advanced Processing and Recycling of Non-ferrous Metals, Lanzhou University of Technology, 730050, Lanzhou, China.
| |
Collapse
|
11
|
Tu HQ, Liu B, Huang DW, Ruan XZ, You B, Huang ZC, Zhai Y, Gao Y, Wang J, Wei LJ, Yuan Y, Xu YB, Du J. Gilbert damping in CoFeB/GaAs(001) film with enhanced in-plane uniaxial magnetic anisotropy. Sci Rep 2017; 7:43971. [PMID: 28262841 PMCID: PMC5338288 DOI: 10.1038/srep43971] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/23/2016] [Accepted: 01/31/2017] [Indexed: 11/09/2022] Open
Abstract
A 3.5 nm amorphous CoFeB film was sputtered on GaAs (001) wafer substrate without applying magnetic field during deposition, and a significant in-plane uniaxial magnetic anisotropy (UMA) field (Hu) of about 300 Oe could be achieved. To precisely determine the intrinsic Gilbert damping constant (α) of this film, both ferromagnetic resonance (FMR) and time-resolved magneto-optical Kerr effect (TRMOKE) techniques were utilized. With good fitting of the dynamic spectra of FMR and TRMOKE, α is calculated to be 0.010 and 0.013, respectively. Obviously, the latter is 30% larger than the former, which is due to the transient heating effect during the TRMOKE measurement. In comparison with ordinary amorphous CoFeB films with negligible magnetic anisotropies, α is enhanced significantly in the CoFeB/GaAs(001) film, which may be mainly resulted from the enhanced spin-orbit coupling induced by the CoFeB/GaAs interface. However, the significant in-plane UMA plays minor role in the enhancement of α.
Collapse
Affiliation(s)
- H Q Tu
- National Laboratory of Solid State Microstructures and Department of Physics, Nanjing University, Nanjing 210093, P. R. China.,Department of Mathematics and Physics, Nanjing Institute of Technology, Nanjing 211167, P. R. China
| | - B Liu
- School of Electronic Science and Engineering, Nanjing University, Nanjing 210046, P. R. China
| | - D W Huang
- School of Electronic Science and Engineering, Nanjing University, Nanjing 210046, P. R. China
| | - X Z Ruan
- School of Electronic Science and Engineering, Nanjing University, Nanjing 210046, P. R. China
| | - B You
- National Laboratory of Solid State Microstructures and Department of Physics, Nanjing University, Nanjing 210093, P. R. China.,Collaborative Innovation Center of Advanced Microstructures, Nanjing 210093, P. R. China
| | - Z C Huang
- Department of Physics and Jiangsu Key Laboratory of Advanced Metallic Materials, Southeast University, Nanjing 211189, P. R. China
| | - Y Zhai
- Department of Physics and Jiangsu Key Laboratory of Advanced Metallic Materials, Southeast University, Nanjing 211189, P. R. China
| | - Y Gao
- National Laboratory of Solid State Microstructures and Department of Physics, Nanjing University, Nanjing 210093, P. R. China
| | - J Wang
- National Laboratory of Solid State Microstructures and Department of Physics, Nanjing University, Nanjing 210093, P. R. China
| | - L J Wei
- National Laboratory of Solid State Microstructures and Department of Physics, Nanjing University, Nanjing 210093, P. R. China
| | - Y Yuan
- National Laboratory of Solid State Microstructures and Department of Physics, Nanjing University, Nanjing 210093, P. R. China
| | - Y B Xu
- School of Electronic Science and Engineering, Nanjing University, Nanjing 210046, P. R. China
| | - J Du
- National Laboratory of Solid State Microstructures and Department of Physics, Nanjing University, Nanjing 210093, P. R. China.,Collaborative Innovation Center of Advanced Microstructures, Nanjing 210093, P. R. China
| |
Collapse
|
12
|
Xu YB, Tang YL, Zhu YL, Liu Y, Li S, Zhang SR, Ma XL. Misfit Strain Relaxation of Ferroelectric PbTiO 3/LaAlO 3 (111) Thin Film System. Sci Rep 2016; 6:35172. [PMID: 27725752 PMCID: PMC5057106 DOI: 10.1038/srep35172] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/29/2016] [Accepted: 09/20/2016] [Indexed: 11/09/2022] Open
Abstract
Ferroelectric thin films grown on high index substrates show unusual structural and switching dynamics due to their special strain states. Understanding the misfit relaxation behavior is crucial to facilitate the high index thin film growth with improved quality. In this paper, ferroelectric PbTiO3 thin films were grown on LaAlO3 (111) substrates by pulsed laser deposition technique. The microstructures were investigated by combinations of conventional and aberration-corrected transmission electron microscopy. Diffraction contrast analysis and high resolution imaging reveal that high density interfacial dislocations were distributed at the interfaces. These dislocations have mixed character with Burgers vectors of a <110> and line directions of <112>. The edge components of the dislocations, with the Burgers vectors parallel to the interface, accommodate the lattice mismatch and are the main contributor to the misfit relaxation of this system. The formation mechanism of these dislocations is proposed and discussed to elucidate the novel mismatch relaxation behavior of <111> oriented perovskite films.
Collapse
Affiliation(s)
- Y B Xu
- Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences, 72 Wenhua Road, 110016 Shenyang, China
| | - Y L Tang
- Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences, 72 Wenhua Road, 110016 Shenyang, China
| | - Y L Zhu
- Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences, 72 Wenhua Road, 110016 Shenyang, China
| | - Y Liu
- Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences, 72 Wenhua Road, 110016 Shenyang, China
| | - S Li
- Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences, 72 Wenhua Road, 110016 Shenyang, China
| | - S R Zhang
- Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences, 72 Wenhua Road, 110016 Shenyang, China
| | - X L Ma
- Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences, 72 Wenhua Road, 110016 Shenyang, China
| |
Collapse
|
13
|
Gao Y, You B, Ruan XZ, Liu MY, Yang HL, Zhan QF, Li Z, Lei N, Zhao WS, Pan DF, Wan JG, Wu J, Tu HQ, Wang J, Zhang W, Xu YB, Du J. Depinning of domain walls in permalloy nanowires with asymmetric notches. Sci Rep 2016; 6:32617. [PMID: 27600627 PMCID: PMC5013472 DOI: 10.1038/srep32617] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/21/2016] [Accepted: 08/10/2016] [Indexed: 11/09/2022] Open
Abstract
Effective control of the domain wall (DW) motion along the magnetic nanowires is of great importance for fundamental research and potential application in spintronic devices. In this work, a series of permalloy nanowires with an asymmetric notch in the middle were fabricated with only varying the width (d) of the right arm from 200 nm to 1000 nm. The detailed pinning and depinning processes of DWs in these nanowires have been studied by using focused magneto-optic Kerr effect (FMOKE) magnetometer, magnetic force microscopy (MFM) and micromagnetic simulation. The experimental results unambiguously exhibit the presence of a DW pinned at the notch in a typical sample with d equal to 500 nm. At a certain range of 200 nm < d < 500 nm, both the experimental and simulated results show that the DW can maintain or change its chirality randomly during passing through the notch, resulting in two DW depinning fields. Those two depinning fields have opposite d dependences, which may be originated from different potential well/barrier generated by the asymmetric notch with varying d.
Collapse
Affiliation(s)
- Y Gao
- National Laboratory of Solid State Microstructures and Department of Physics, Nanjing University, Nanjing 210093, P. R. China
| | - B You
- National Laboratory of Solid State Microstructures and Department of Physics, Nanjing University, Nanjing 210093, P. R. China.,Collaborative Innovation Center of Advanced Microstructures, Nanjing 210093, P. R. China
| | - X Z Ruan
- School of Electronic Science and Engineering, Nanjing University, Nanjing 210046, P. R. China
| | - M Y Liu
- School of Electronic Science and Engineering, Nanjing University, Nanjing 210046, P. R. China
| | - H L Yang
- Key Laboratory of Magnetic Materials and Devices &Zhejiang Province Key Laboratory of Magnetic Materials and Application Technology, Ningbo Institute of Material Technology and Engineering, Chinese Academy of Sciences, Ningbo, Zhejiang 315201, P. R. China
| | - Q F Zhan
- Key Laboratory of Magnetic Materials and Devices &Zhejiang Province Key Laboratory of Magnetic Materials and Application Technology, Ningbo Institute of Material Technology and Engineering, Chinese Academy of Sciences, Ningbo, Zhejiang 315201, P. R. China
| | - Z Li
- Fert Beijing Institute, Beihang University, Beijing, P. R. China.,School of Electronic and Information Engineering, Beihang University, Beijing, China
| | - N Lei
- Fert Beijing Institute, Beihang University, Beijing, P. R. China.,School of Electronic and Information Engineering, Beihang University, Beijing, China
| | - W S Zhao
- Fert Beijing Institute, Beihang University, Beijing, P. R. China.,School of Electronic and Information Engineering, Beihang University, Beijing, China
| | - D F Pan
- National Laboratory of Solid State Microstructures and Department of Physics, Nanjing University, Nanjing 210093, P. R. China
| | - J G Wan
- National Laboratory of Solid State Microstructures and Department of Physics, Nanjing University, Nanjing 210093, P. R. China
| | - J Wu
- Department of Physics, University of York, York YO10 5DD, United Kingdom
| | - H Q Tu
- National Laboratory of Solid State Microstructures and Department of Physics, Nanjing University, Nanjing 210093, P. R. China
| | - J Wang
- National Laboratory of Solid State Microstructures and Department of Physics, Nanjing University, Nanjing 210093, P. R. China
| | - W Zhang
- National Laboratory of Solid State Microstructures and Department of Physics, Nanjing University, Nanjing 210093, P. R. China
| | - Y B Xu
- School of Electronic Science and Engineering, Nanjing University, Nanjing 210046, P. R. China
| | - J Du
- National Laboratory of Solid State Microstructures and Department of Physics, Nanjing University, Nanjing 210093, P. R. China.,Collaborative Innovation Center of Advanced Microstructures, Nanjing 210093, P. R. China
| |
Collapse
|
14
|
Xu YB, Jiang W, Zhao FR, Li G, Du QH, Zhang MY, Guo XG. Propofol suppresses invasion and induces apoptosis of osteosarcoma cell in vitro via downregulation of TGF-β1 expression. Eur Rev Med Pharmacol Sci 2016; 20:1430-1435. [PMID: 27097968] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
OBJECTIVE Osteosarcoma (OS) is the most common malignant tumor of the bone, with a high mortality rate and poor prognosis. Propofol has been proposed to play a role of antitumor in various cancers. However, the functions and mechanisms of propofol in OS is still not clear. MATERIALS AND METHODS The different concentrations of propofol were co-incubated with osteosarcoma MG-63 lines for 72 hrs. Cell proliferation, apoptosis, and invasion were detected by MTT assay, Flow cytometry analysis, and Matrigel invasion assay. Western blot was used to detect the TGF-β1 protein levels. MG-63 cells were treated with human recombinant TGF-β1 (rh TGF-β1) to assess the role of TGF-β1 in propofol-induced anti-tumor activity. RESULTS Propofol significantly inhibited cell proliferation and invasion and promoted apoptosis of MG-63 lines cells. Propofol also efficiently reduced TGF-β1 expression. Moreover, restoration of TGF-β1 by rhTGF-β1 treatment reversed the effects of propofol on the biological behavior of OS cells. CONCLUSIONS Propofol can effectively inhibit proliferation and invasion and induce apoptosis of OS cells through, at least partly, downregulation of TGF-β1 expression.
Collapse
Affiliation(s)
- Y-B Xu
- Department of Anesthesiology, Shandong Provincial Hospital Affiliated to Shandong University, Jinan, China.
| | | | | | | | | | | | | |
Collapse
|
15
|
Guo XG, Wang S, Xu YB, Zhuang J. Propofol suppresses invasion, angiogenesis and survival of EC-1 cells in vitro by regulation of S100A4 expression. Eur Rev Med Pharmacol Sci 2015; 19:4858-4865. [PMID: 26744878] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
OBJECTIVE Propofol possess anticancer properties in several cancers. In the present study, we investigate the effect of propofol on the human esophageal squamous cell carcinomas (ESCC) EC-1 cells in vitro and its molecular mechanisms of action. MATERIALS AND METHODS EC-1 cells were explored to 10-100 μmol/L propofol for 72 h or 100 μmol/L/mL propofol for 24-72 h. EC-1 cells were explored to 100 μmol/L propofol for 24 h, then was transiently transfected into PcDNA3.1-S100A4 cDNA or PcDNA3.1 plasmid for 48 hrs. MTT, TUNEL, ELISA, migration, tube formation and immunoblotting were analized. RESULTS Propofol inhibits invasion, angiogenesis, proliferation and induces apoptosis in a dose and time-dependence manner, followed by deseased S100A4 expression by Western blot assay. Pre-transfection of PcDNA3.1-S100A4 cDNA inhibits propofol-induced apoptosis and promotes invasion and angiogenesis in EC-1 cells in vitro. CONCLUSIONS Propofol inhibited invasion, angiogenesis and induces apoptosis of human EC-1 cells in vitro through regulation of S100A4 expression. It not only can be an anesthesia agent, but also plays a important role of inhibiting the migration and angiogenesis of ESCC cells in the therapy of ESCC patients.
Collapse
Affiliation(s)
- X-G Guo
- Department of Anesthesia, Guangdong Cardiovascular Institute, Guangdong General Hospital, Guangzhou, Guangdong, China.
| | | | | | | |
Collapse
|
16
|
Liu WQ, Wang WY, Wang JJ, Wang FQ, Lu C, Jin F, Zhang A, Zhang QM, Laan GVD, Xu YB, Li QX, Zhang R. Atomic-Scale Interfacial Magnetism in Fe/Graphene Heterojunction. Sci Rep 2015; 5:11911. [PMID: 26145155 PMCID: PMC4491707 DOI: 10.1038/srep11911] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/04/2015] [Accepted: 05/15/2015] [Indexed: 11/16/2022] Open
Abstract
Successful spin injection into graphene makes it a competitive contender in the race to become a key material for quantum computation, or the spin-operation-based data processing and sensing. Engineering ferromagnetic metal (FM)/graphene heterojunctions is one of the most promising avenues to realise it, however, their interface magnetism remains an open question up to this day. In any proposed FM/graphene spintronic devices, the best opportunity for spin transport could only be achieved where no magnetic dead layer exists at the FM/graphene interface. Here we present a comprehensive study of the epitaxial Fe/graphene interface by means of X-ray magnetic circular dichroism (XMCD) and density functional theory (DFT) calculations. The experiment has been performed using a specially designed FM1/FM2/graphene structure that to a large extent restores the realistic case of the proposed graphene-based transistors. We have quantitatively observed a reduced but still sizable magnetic moments of the epitaxial Fe ML on graphene, which is well resembled by simulations and can be attributed to the strong hybridization between the Fe 3dz2 and the C 2pz orbitals and the sp-orbital-like behavior of the Fe 3d electrons due to the presence of graphene.
Collapse
Affiliation(s)
- W Q Liu
- York-Nanjing Joint Centre (YNJC) for Spintronics and Nanoengineering, School of Electronics Science and Engineering, Nanjing University, Nanjing 210093, China.,Spintronics and Nanodevice Laboratory, Department of Electronics, University of York, York YO10 5DD, UK
| | - W Y Wang
- Hefei National Laboratory for Physical Sciences at the Microscale, University of Science and Technology of China, Hefei 230026, China.,Synergetic Innovation Center of Quantum Information and Quantum Physics, University of Science and Technology of China, Hefei, Anhui 230026, China
| | - J J Wang
- Hefei National Laboratory for Physical Sciences at the Microscale, University of Science and Technology of China, Hefei 230026, China.,Synergetic Innovation Center of Quantum Information and Quantum Physics, University of Science and Technology of China, Hefei, Anhui 230026, China
| | - F Q Wang
- York-Nanjing Joint Centre (YNJC) for Spintronics and Nanoengineering, School of Electronics Science and Engineering, Nanjing University, Nanjing 210093, China
| | - C Lu
- Spintronics and Nanodevice Laboratory, Department of Electronics, University of York, York YO10 5DD, UK
| | - F Jin
- Department of Physics, Renmin University of China, Beijing 100872, China
| | - A Zhang
- Department of Physics, Renmin University of China, Beijing 100872, China
| | - Q M Zhang
- Department of Physics, Renmin University of China, Beijing 100872, China
| | | | - Y B Xu
- York-Nanjing Joint Centre (YNJC) for Spintronics and Nanoengineering, School of Electronics Science and Engineering, Nanjing University, Nanjing 210093, China.,Spintronics and Nanodevice Laboratory, Department of Electronics, University of York, York YO10 5DD, UK
| | - Q X Li
- Hefei National Laboratory for Physical Sciences at the Microscale, University of Science and Technology of China, Hefei 230026, China.,Synergetic Innovation Center of Quantum Information and Quantum Physics, University of Science and Technology of China, Hefei, Anhui 230026, China
| | - R Zhang
- York-Nanjing Joint Centre (YNJC) for Spintronics and Nanoengineering, School of Electronics Science and Engineering, Nanjing University, Nanjing 210093, China
| |
Collapse
|
17
|
Hu FS, Zhang YL, Ma ZC, Cao QQ, Xu YB, He ZJ, Sun YN. A region-matching method for pulse transit time estimation: potential for improving the accuracy in determining carotid femoral pulse wave velocity. J Hum Hypertens 2015; 29:675-82. [PMID: 25694218 DOI: 10.1038/jhh.2015.9] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/11/2014] [Revised: 12/15/2014] [Accepted: 01/06/2015] [Indexed: 11/09/2022]
Abstract
Carotid femoral pulse wave velocity (cfPWV) is the 'gold standard' for assessment of arterial stiffness. The reliability of cfPWV measurement depends on the estimation of pulse transit time (PTT). This study aimed to validate a region-matching method for determining PTT and cfPWV against the existing 'foot-to-foot' methods. A cohort of 81 subjects (33 males and 48 females) aged 25-80 (45.1±15.7 years) were studied. PTTs were estimated by the region matching and 'foot-to-foot' methods ('diastole minimum', 'maximum first derivative', 'maximum second derivative' and 'tangent intersection' methods) with manual identification as the reference method and were subsequently used to calculate cfPWV. In a subgroup of 30 individuals, the measurements were repeated after 1 h. There were excellent correlations between cfPWV obtained by the reference method and all the estimated methods (r>0.9, P<0.001 for all), except the diastole minimum method (r=0.793, P<0.001). The region-matching method yielded cfPWV with a better accuracy (mean difference=-0.161 m s(-1), limits of agreement: -0.79 to 0.46 m s(-1)) and repeatability (mean difference=-0.228 m s(-1), intraclass correlation coefficient=0.957) comparing with the 'foot-to-foot' methods. These results demonstrate that the proposed region-matching method is more accurate and suitable for PTT estimation and cfPWV measurement.
Collapse
Affiliation(s)
- F S Hu
- Department of Automation, University of Science and Technology of China, Hefei, PR China.,Research Center for Information Technology of Sports and Health, Institute of Intelligent Machines, Chinese Academy of Sciences, Hefei, PR China
| | - Y L Zhang
- Research Center for Information Technology of Sports and Health, Institute of Intelligent Machines, Chinese Academy of Sciences, Hefei, PR China
| | - Z C Ma
- Research Center for Information Technology of Sports and Health, Institute of Intelligent Machines, Chinese Academy of Sciences, Hefei, PR China
| | - Q Q Cao
- Research Center for Information Technology of Sports and Health, Institute of Intelligent Machines, Chinese Academy of Sciences, Hefei, PR China
| | - Y B Xu
- Research Center for Information Technology of Sports and Health, Institute of Intelligent Machines, Chinese Academy of Sciences, Hefei, PR China
| | - Z J He
- Research Center for Information Technology of Sports and Health, Institute of Intelligent Machines, Chinese Academy of Sciences, Hefei, PR China
| | - Y N Sun
- Research Center for Information Technology of Sports and Health, Institute of Intelligent Machines, Chinese Academy of Sciences, Hefei, PR China
| |
Collapse
|
18
|
Hu XF, Wu J, Niu DX, Chen L, Morton SA, Scholl A, Huang ZC, Zhai Y, Zhang W, Will I, Xu YB, Zhang R, van der Laan G. Discontinuous properties of current-induced magnetic domain wall depinning. Sci Rep 2013; 3:3080. [PMID: 24170087 PMCID: PMC3812652 DOI: 10.1038/srep03080] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/20/2013] [Accepted: 09/24/2013] [Indexed: 11/09/2022] Open
Abstract
The current-induced motion of magnetic domain walls (DWs) confined to nanostructures is of great interest for fundamental studies as well as for technological applications in spintronic devices. Here, we present magnetic images showing the depinning properties of pulse-current-driven domain walls in well-shaped Permalloy nanowires obtained using photoemission electron microscopy combined with x-ray magnetic circular dichroism. In the vicinity of the threshold current density (Jth = 4.2 × 1011 A.m−2) for the DW motion, discontinuous DW depinning and motion have been observed as a sequence of “Barkhausen jumps”. A one-dimensional analytical model with a piecewise parabolic pinning potential has been introduced to reproduce the DW hopping between two nearest neighbour sites, which reveals the dynamical nature of the current-driven DW motion in the depinning regime.
Collapse
Affiliation(s)
- X F Hu
- 1] Spintronics and Nanodevice Laboratory, Department of Electronics, University of York, York YO10 5DD, UK [2] Nanjing-York International Center of Spintronics, School of Electronics Science and Engineering, Nanjing University, Nanjing 210093, China
| | | | | | | | | | | | | | | | | | | | | | | | | |
Collapse
|
19
|
Xu YB, Du QH, Zhang MY, Yun P, He CY. Propofol suppresses proliferation, invasion and angiogenesis by down-regulating ERK-VEGF/MMP-9 signaling in Eca-109 esophageal squamous cell carcinoma cells. Eur Rev Med Pharmacol Sci 2013; 17:2486-2494. [PMID: 24089228] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 06/02/2023]
Abstract
BACKGROUND AND AIMS Propofol (2,6-diisopropylphenol), one of the most commonly used intravenous anaesthetic agents during cancer resection surgery, has been reported to have the ability of influencing the invasion of human cancer cells. However, the mechanisms are not very clear. In this study, we investigated the effects of propofol on the proliferation, invasion and angiogenesis of human Eca-109 cells, and explored the mechanism. METHODS The human Eca-109 cells was treated with propofol at the concentrations of 10-100 µmol/L for 72 hours or at the concentration of 100 µmol for 8-72 hours. Cell viability was determined by the MTT assay; the effect of propofol on apoptosis by 5'-triphosphate-biotin nick end labeling (TUNEL) staining. The effect of propofol on angiogenesis was determined by the chicken chorioallantoic membrane (CAM) angiogenesis assay. The effect of propofol on cell invasion using a modified Matrigel Boyden chamber assay. ERK1/2, MMP-9 and VEGF leves was detected by western blotting assay. RESULTS In human Eca-109 cells, propofol significantly promoted cell apoptosis and inhibited proliferation in a dose and time-dependent manner. Furthermore, propofol inhibited dose and time-dependent invasion and angiogenesis. Propofol significantly dose and time-dependently down-regulated gene expression and protein production of ERK/pERK, VEGF and MMP-9. The functional effects and MMP-9/VEGF inhibition were shown to be dependent on the ERK/VEGF and ERK/MMP-9 signaling pathways. It was noteworthy that the ERK activator (phorbol 12-myristate 13-acetate [PMA]) treatment increased the MMP-9/VEGF levels after propofol treatment, and led to significant increase of proliferation, invasion and angiogenesis. CONCLUSIONS These findings indicate that propofol inhibited proliferation, invasion and angiogenesis of human Eca-109 cells in vitro through modulation of ERK-VEGF /MMP-9 signaling. Propofol not only can be an anesthesia agent which reduces pain but plays an important role of inhibiting the migration and angiogenesis of ESCC cells in the therapy of ESCC patients.
Collapse
Affiliation(s)
- Y-B Xu
- Department of Anesthesiology, Provincial-Owned Hospital Affiliated to Shandong University, Jinan, Shandong Province, China.
| | | | | | | | | |
Collapse
|
20
|
Nie SH, Chin YY, Liu WQ, Tung JC, Lu J, Lin HJ, Guo GY, Meng KK, Chen L, Zhu LJ, Pan D, Chen CT, Xu YB, Yan WS, Zhao JH. Ferromagnetic interfacial interaction and the proximity effect in a Co2FeAl/(Ga,Mn)As bilayer. Phys Rev Lett 2013; 111:027203. [PMID: 23889435 DOI: 10.1103/physrevlett.111.027203] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/05/2013] [Indexed: 06/02/2023]
Abstract
The magnetic properties of a Co2FeAl/(Ga,Mn)As bilayer epitaxied on GaAs (001) are studied both experimentally and theoretically. Unlike the common antiferromagnetic interfacial interaction existing in most ferromagnet-magnetic semiconductor bilayers, a ferromagnetic interfacial interaction in the Co2FeAl/(Ga,Mn)As bilayer is observed from measurements of magnetic hysteresis and x-ray magnetic circular dichroism. The Mn ions in a 1.36 nm thick (Ga,Mn)As layer remain spin polarized up to 400 K due to the magnetic proximity effect. The minor loops of the Co2FeAl/(Ga,Mn)As bilayer shift with a small ferromagnetic interaction field of +24 Oe and -23 Oe at 15 K. The observed ferromagnetic interfacial coupling is supported by ab initio density functional calculations. These findings may provide a viable pathway for designing room-temperature semiconductor spintronic devices through magnetic proximity effect.
Collapse
Affiliation(s)
- S H Nie
- State Key Laboratory of Superlattices and Microstructures, Institute of Semiconductors, Chinese Academy of Sciences, Beijing 100083, China
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | |
Collapse
|
21
|
Jian FG, Chu HB, Liu GZ, Zhao JH, Xu YB, Wang T, Sun HJ, Tang JY, Guo WJ, Wu HJ, Zhang SM. Morphological characteristics of the walls of thrombophlebitic saphenous vein. Phlebology 2013; 29:164-70. [PMID: 23455013 DOI: 10.1177/0268355512472135] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
Abstract
Introduction: To investigate the morphological changes in the walls of thrombophlebitic saphenous veins. Methods: Fifty-four specimens were made into slices for haematoxylin and eosin and Masson trichrome staining; ultrathin slices were also created. Slices were observed under light microscopy and electron microscopy. Results: Under light microscopy, the tunica intima of venous wall in the thrombophlebitic saphenous veins group was obviously thickened and incomplete; intravascular papillary endothelial hyperplasia was observed. Hyperplasia of collagenous fibres in the tunica media was observed. Elastic fibres in the tunica externa became fewer, whereas nourishing vessels were significantly increased in number. Infiltration of many inflammatory cells was observed. Under electron microscopy, Auer bodies with high electron density and round granules could be seen in endothelial cells in the thrombophlebitic saphenous veins group. Smooth muscle cells had an irregular karyotype, with blurred cristae in some mitochondria. Myofilaments basically disappeared. Conclusion: Thrombus formation might aggravate re-modelling of the walls of varicose veins.
Collapse
Affiliation(s)
- F-G Jian
- Department of General Surgery, Changyi People's Hospital, Changyi, China
| | | | - G-Z Liu
- Department of General Surgery, Changyi People's Hospital, Changyi, China
| | | | - Y-B Xu
- Center of General Surgery
| | - T Wang
- Department of Pathology, The 89th Hospital of People's Liberation Army, Weifang, China
| | - H-J Sun
- Department of General Surgery, Changyi People's Hospital, Changyi, China
| | | | | | - H-J Wu
- Department of Electron Microscope, Weifang Medical University, Weifang, China
| | - S-M Zhang
- Department of Electron Microscope, Weifang Medical University, Weifang, China
| |
Collapse
|
22
|
Abstract
OBJECTIVES To investigate retrospectively whether alterations of p53 upregulated mediator of apoptosis (PUMA) protein levels and somatic mutations of the PUMA gene are characteristic of pancreatic ductal adenocarcinoma (PDAC). METHODS Immunohistochemical analyses of PUMA were performed in pancreatic tumour tissue samples, and paired normal pancreatic tissue samples, from patients with PDAC. Apoptosis was detected using terminal deoxynucleotidyl transferase-mediated deoxyuridine triphosphate nick-end labelling assay. RESULTS A total of 70 patients with PDAC had samples available; 49 cases (70.0%) had high PUMA protein levels. PUMA was not detected in paired normal tissue samples. Significantly higher levels of PUMA protein were detected in low-grade tumours (tumour -node-metastasis stages I and II), compared with higher grade (stage III) tumours. Of the PDAC cases, the mean apoptosis index value for PUMA-positive specimens was significantly higher than that for PUMA-negative specimens. Overall survival was significantly associated with PUMA immunoreactivity. CONCLUSIONS High levels of PUMA in PDAC tumour cells suggest that PUMA expression may play a role in pancreatic tumourigenesis.
Collapse
Affiliation(s)
- Q H Du
- Department of Surgery, Shandong Provincial-owned Hospital, Jinan, Shandong, China
| | | | | | | | | | | | | |
Collapse
|
23
|
Will IG, Ding A, Xu YB. Development of an in situ magnetoelastic magneto-optical Kerr effect magnetometer. Rev Sci Instrum 2012; 83:064707. [PMID: 22755651 DOI: 10.1063/1.4729572] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/01/2023]
Abstract
Reported here is the development and implementation of an integrated in situ magnetoelastic measurement setup with a MOKE magnetometer, repositionable electromagnet, and sample transfer/straining device. The former were used within a molecular beam epitaxial vacuum growth chamber. Consequently the magnetostriction constants for both Cr capped and uncapped Fe/GaAs(100) films were acquired without film oxidization occurring. Samples were bent in a four point bending geometry to produce a quantifiable tensile mechanical strain on the films during magnetoelastic measurements. In addition, a laser measurement system was developed to confirm the induced strain in the samples.
Collapse
Affiliation(s)
- I G Will
- Electronics Department, University of York, Heslington, York YO10 5DD, United Kingdom
| | | | | |
Collapse
|
24
|
Guo Q, Zhang ZJ, Xu YB, Li GH, Feng J, Zhou Y. Quantitative trait loci for high-temperature adult-plant and slow-rusting resistance to Puccinia striiformis f. sp. tritici in wheat cultivars. Phytopathology 2008; 98:803-9. [PMID: 18943256 DOI: 10.1094/phyto-98-7-0803] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/20/2023]
Abstract
Stripe rust, caused by Puccinia striiformis f. sp. tritici, is one of the most damaging diseases of wheat (Triticum aestivum) globally. High-temperature adult-plant resistance (HTAPR) and slow-rusting have great potential for sustainable management of the disease. The wheat cultivars Luke and Aquileja have been previously reported to possess HTAPR and slow-rusting to stripe rust, respectively. Aquileja displayed less number of stripes per unit leaf area than Luke, while Luke showed lower infection type than Aquileja at adult-plant stages of growth under high-temperature conditions. The objectives of this study were to confirm the resistances and to map the resistance genes in Luke and Aquileja. Luke was crossed with Aquileja, and 326 of the F(2) plants were genotyped using 282 microsatellite primer pairs. These F(2) plants and their derived F(3) families were evaluated for resistance to stripe rust by inoculation in the fields and greenhouses of high- and low-temperatures. Infection type was recorded for both seedlings and adult plants, and stripe number was recorded for adult plants only. Two quantitative trait loci (QTL) were identified, on the short arm of chromosome 2B, to be significantly associated with infection type at adult-plant stages in the fields and in the high-temperature greenhouse. The locus distal to centromere, referred to as QYrlu.cau-2BS1, and the locus proximal to centromere, referred to as QYrlu.cau-2BS2, were separated by a genetic distance of about 23 cM. QYrlu.cau-2BS1 was flanked by the microsatellite markers Xwmc154 and Xgwm148, and QYrlu.cau-2BS2 was flanked by Xgwm148 and Xabrc167. QYrlu.cau-2BS1 and QYrlu.cau-2BS2 explained up to 36.6 and 41.5% of the phenotypic variation of infection type, respectively, and up to 78.1% collectively. No significant interaction between the two loci was detected. Another QTL, referred to as QYraq.cau-2BL, was detected on the long arm of chromosome 2B to be significantly associated with stripe number. QYraq.cau-2BL was flanked by the microsatellite markers Xwmc175 and Xwmc332, and it explained up to 61.5% of the phenotypic variation of stripe number. It is possible that these three QTL are previously unmapped loci for resistance to stripe rust.
Collapse
Affiliation(s)
- Q Guo
- Department of Plant Pathology, China Agricultural University, Beijing, China
| | | | | | | | | | | |
Collapse
|
25
|
Lu Y, Xu YB, Yuan TT, Song MG, Lübbert M, Fliegauf M, Chen GQ. Inducible expression of AML1-ETO fusion protein endows leukemic cells with susceptibility to extrinsic and intrinsic apoptosis. Leukemia 2006; 20:987-93. [PMID: 16598301 DOI: 10.1038/sj.leu.2404218] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Abstract
AML1-ETO, a leukemia-associated fusion protein generated by the frequently occurred chromosome translocation t(8;21) in acute myeloid leukemia, was shown to exert dichotomous functions in leukemic cells, that is, growth arrest versus differentiation block. By the analysis of oligonucleotide microarray, AML1-ETO was shown to modulate the expressions of an impressive array of pro- and anti-apoptotic genes. Here, we investigate potential effects of the ecdysone inducible AML1-ETO expression on apoptosis of leukemic U937 cell line. We show that AML1-ETO significantly stabilizes death receptor Fas protein and increases proapoptotic Bak in addition to reducing Bcl-2 expression. Accordingly, inducible AML1-ETO expression is followed by apoptosis to a lower degree. Especially, AML1-ETO endows leukemic cells with the susceptibility to anti-Fas agonist antibody, ultraviolet light and camptothecin analog NSC606985-induced apoptosis with increased activation of caspase-3/8. Considering that apoptosis-enhancing effect of AML1-ETO would not be favorable to the leukemogenesis harboring the t(8;21) translocation, it must be overcome to fulfill their leukemogenic potential. Complementary to this prediction is that two AML1-ETO-carrying leukemic cells, Kasumi-1 and SKNO-1, present similar sensitivity to apoptosis induction with AML1-ETO-negative leukemic cells. Therefore, genetic and/or epigenetic screenings of apoptosis-related genes modulated by AML1-ETO deserve to be explored for understanding the mechanisms of AML1-ETO-induced leukemogenesis.
Collapse
Affiliation(s)
- Y Lu
- The Department of Pathophysiology, Key Laboratory of Cell Differentiation and Apoptosis of Chinese Ministry of Education, Rui-Jin Hospital, Shanghai Jiao-Tong University School of Medicine, Shanghai, China
| | | | | | | | | | | | | |
Collapse
|
26
|
Wang XQ, Wang M, Li ZH, Xu YB, He PM. Modeling and calculation of field emission enhancement factor for carbon nanotubes array. Ultramicroscopy 2005; 102:181-7. [PMID: 15639348 DOI: 10.1016/j.ultramic.2004.08.009] [Citation(s) in RCA: 44] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/10/2004] [Revised: 08/05/2004] [Accepted: 08/24/2004] [Indexed: 11/15/2022]
Abstract
To estimate the apex field enhancement factor associated with carbon nanotubes (CNTs) array on a planar cathode surface, the image model of floated sphere between parallel anode and cathode plates was proposed. Firstly, the field enhancement factor of individual CNT was given as the following expression, beta0=h/rho+3.5, where h is the height and rho is the radius of CNTs. Then the field enhancement factor of CNTs array was discussed and the above expression was modified to be beta=h/rho+3.5-W, in which W is the function of the intertube distance R and represents the coulomb field interaction between the CNTs. All results show that the intertube distance of CNTs array critically affects the field emission. When the intertube distance is less than the height of tube, the field enhancement factor will decrease rapidly with decreasing the intertube distance. According to the calculated results and considering the field emission current density, the filed emission is optimal theoretically when the intertube distance is comparable with the height of CNTs.
Collapse
Affiliation(s)
- X Q Wang
- Department of Physics, Zhejiang University, Hangzhou, 310027, People's Republic of China.
| | | | | | | | | |
Collapse
|
27
|
Claydon JS, Xu YB, Tselepi M, Bland JAC, van der Laan G. Direct observation of a bulklike spin moment at the Fe/GaAs(100)-4x6 interface. Phys Rev Lett 2004; 93:037206. [PMID: 15323864 DOI: 10.1103/physrevlett.93.037206] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/19/2004] [Indexed: 05/24/2023]
Abstract
We have used x-ray magnetic circular dichroism, which offers a unique capability to give element specific information at submonolayer sensitivity, to determine the spin and orbital magnetic moments at the Fe/GaAs(100) interface. The wedge samples, grown by molecular beam epitaxy at room temperature, consisted of 0.25-1 monolayer (ML) Fe on GaAs(100)-4x6 capped with 9 ML Co and have shown Fe spin moments of (1.84-1.96)micro(B) and a large orbital enhancement. Our results demonstrate unambiguously that the Fe/GaAs(100)-4x6 interface is ferromagnetic with a bulklike spin moment, which is highly promising for spintronics applications.
Collapse
Affiliation(s)
- J S Claydon
- Spintronics Laboratory, Department of Electronics, The University of York, York YO10 5DD, United Kingdom
| | | | | | | | | |
Collapse
|
28
|
Lepadatu S, Xu YB. Direct observation of domain wall scattering in patterned Ni80Fe20 and Ni nanowires by current-voltage measurements. Phys Rev Lett 2004; 92:127201. [PMID: 15089700 DOI: 10.1103/physrevlett.92.127201] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/13/2003] [Indexed: 05/24/2023]
Abstract
We present measurements of domain wall resistivity, pinned by nanoconstrictions in single layer ferromagnetic wires of Ni80Fe20 and Ni. Unpinning domain walls from the constriction by current-induced switching allows for an unambiguous measurement of their resistivity changes, namely, 1.7% in Ni80Fe20 and 1.82% in Ni and both positive, which supports the theory of spin-dependent impurity scattering. By deriving an empirical relation for the various constriction widths, the large percentage changes of resistivity in ballistic nanocontacts are reproduced, showing a correlation between domain wall magnetoresistance and ballistic magnetoresistance.
Collapse
Affiliation(s)
- S Lepadatu
- Spintronics Laboratory, Department of Electronics, The University of York, York YO10 5DD, United Kingdom
| | | |
Collapse
|
29
|
Abstract
A non-contact laser flowmeter was used to measure the changing of the gingival blood flow. Five university students with healthy oral condition were selected in this study. The blood flow measurement on the extensor digitorum (above the head of third metacarpal), with the changing of distance and angle between the probe and the tissue was used as a pre-study experiment. Blood flow rate was determined in the labial gingiva (2 mm above the cervical line) of upper central incisor using a stent fixing the probe at a 3-mm distance from the tissue. A basal level of gingival blood flow was taken two times each day for 5 days. The effects of water of different temperatures on the gingival blood flow are discussed. With the changing of distance, the blood flow rate became smaller, but there was no significant effect from the angle. The reproducibility was acceptable through the 5-day measurement. After stimulating with warm and body temperature water, the blood flow first increased significantly and then went back to the basal line (faster with the body temperature water). With cold water, different reactions between the subjects were observed.
Collapse
Affiliation(s)
- M Matsuki
- Department of Prosthodontics, Asahi University School of Dentistry, Hozumi, Gifu 501-0296, Japan
| | | | | |
Collapse
|
30
|
Yang H, Zhang SX, Xie YB, Wu ZP, Zhu XF, Xu YB. [A study on the colour of natural tooth and porcelain fused to metal crown]. Shanghai Kou Qiang Yi Xue 2001; 10:83-4. [PMID: 14994094] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Subscribe] [Scholar Register] [Indexed: 04/29/2023]
Affiliation(s)
- H Yang
- Department of Dentistry, Huadong Hospital, Shanghai 200040, China
| | | | | | | | | | | |
Collapse
|
31
|
Abstract
The structure of active site carboxymethylated D-glyceraldehyde-3-phosphate dehydrogenase from Palinurus versicolor was determined in the presence of coenzyme NAD+ at 1.88 A resolution with a final R-factor of 0.175. The structure refinement was carried out on the basis of the structure of holo-GAPDH at 2.0 A resolution using the program XPLOR. The carboxymethyl group connected to Cys149 is stabilized by a hydrogen bond between its OZ1 and Cys149N, and charge interaction between the carboxyl group and the nicotinamide moiety. The modification of Cys149 induced conformational changes in the active site, in particular, the site of sulphate ion 501 (the proposed attacking inorganic phosphate ion in catalysis), and segment 208-218 nearby. Extensive hydrogen-bonding interactions occur in the active site, which contribute to the higher stability of the modified enzyme. The modification of the active site did not affect the conformation of GAPDH elsewhere, including the subunit interfaces. The structures of the green and red subunits in the asymmetric unit are nearly identical, suggesting that the half-site reactivity of this enzyme is from ligand-induced rather than pre-existing asymmetry. It is proposed that the carboxymethyl group takes the place of the acyl group of the reaction intermediate, and the catalytic mechanism of this enzyme is discussed in the light of a comparison of the structures of the native and the carboxymethylated GAPDH.
Collapse
Affiliation(s)
- S Y Song
- Institute of Biophysics, Academia Sinica, Beijing, 100101, China
| | | | | | | |
Collapse
|
32
|
|
33
|
Xu P, Qian XM, Wang YX, Xu YB. Modelling for waste water treatment by Rhodopseudomonas palustris Y6 immobilized on fibre in a columnar bioreactor. Appl Microbiol Biotechnol 1996; 44:676-82. [PMID: 8703436 DOI: 10.1007/bf00172502] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/01/2023]
Abstract
A kinetic model of continuous treatment of waste water by Rhodopseudomonas palustris Y6 immobilized on soft fibre in a columnar bioreaction system was established. Good agreement was found between the model prediction and the experimental data from continuous operation [initial chemical oxygen demand (COD) concentration = 29.700 g/l] of the system. The optimum operational conditions for the maximum COD reduction capacity were investigated from the model prediction and the experimental data. The waste water treatment process may significantly increase the waste reduction capacity because a large amount of active biomass for COD reduction is immobilized in the system, resulting in operation stability. The results presented here provide a useful basis for further scaling up and efficient operation of waste water treatment processes.
Collapse
Affiliation(s)
- P Xu
- Department of Microbiology, Shandong University, Jinan, China
| | | | | | | |
Collapse
|
34
|
Xu YB, Zhu JS, Zhang GP. [Activation and free radical formation of leukocytes in patients with acute ischemic stroke]. Zhonghua Nei Ke Za Zhi 1994; 33:799-802. [PMID: 7768134] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/27/2023]
Abstract
The leukocyte count, leukocyte activation, lipoperoxidant (Lpo) of leukocytes and C3 in the peripheral blood were determined in 44 patients with acute ischemic stroke and the results were compared with those in age-matched healthy controls. No significant difference in mean leukocyte counts was observed between the patients and controls. The levels of leukocyte activation in the patients were significantly higher than those in the controls (137.94 +/- 38.86 U/L vs 92.22 +/- 20.29 U/L, P < 0.01), while the levels of Lpo of leukocytes and C3 were significantly lower than those in the controls (0.90 +/- 0.87 mumol/L and 0.96 +/- 0.72 g/L vs 1.57 +/- 1.29 mumol/L and 1.69 +/- 0.70 g/L, P < 0.01). The changes of these levels were in correlation with the extent of cerebral infarction. It is suggested that leukocytes might be involved in the pathophysiological process of acute ischemic brain damage. Its mechanisms and route of activation were discussed briefly.
Collapse
Affiliation(s)
- Y B Xu
- Huzhou Second Municipal Hospital, Zhejiang
| | | | | |
Collapse
|
35
|
Jin QY, Xu YB, Zhai HR, Hu C, Lu M, Bie QS, Zhai Y, Dunifer GL, Naik R, Ahmad M. Direct evidence of spin polarization oscillations in the Cu layers of Fe/Cu multilayers observed by NMR. Phys Rev Lett 1994; 72:768-771. [PMID: 10056518 DOI: 10.1103/physrevlett.72.768] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
|
36
|
Xu YB, Shen ZT. Diallel analysis of tiller number at different growth stages in rice (Oryza sativa L.). Theor Appl Genet 1991; 83:243-9. [PMID: 24202365 DOI: 10.1007/bf00226258] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/04/1991] [Accepted: 05/16/1991] [Indexed: 05/14/2023]
Abstract
The genetics of tiller number at different development stages in rice was studied in a 6 x 6 diallel cross set involving six indica rice varieties in which a large difference of phenotypes existed. Estimates of genetic parameters following Hayman's method showed significant additive and nonadditive gene action, and the latter appeared to be solely due to dominance. High tillering ability was inherited as a partial dominant character conditioned by two or more blocks of genes, and var 'H1459' had more dominant genes, whereas 'Zhu-Yun-Luo' had more recessive ones. Combining ability analysis by Griffing's method also indicated significance of both additive and nonadditive effects, but the former was more important than the latter. 'H1459' and 'Bi-Yu-Zao-Luo' were good general combiners, and their hybrids 'H1459' x 'Le-Yi' and 'Zhu-Yun-Luo' x 'Bi-Yu-Zao-Luo' were better crosses for combining an optimum tiller number with high percentage of productive tiller. An identical polygenic system appeared to be responsible for the genetic control of both tiller number at the different growth stages and the terminal character, productive tiller number. However, with growth of the plant, relative contributions of nonadditive gene action and environmental factors to the variation decreased, while those of additive gene action increased. Selection for high tillering ability, therefore, should be exercised at peak tillering or later stages.
Collapse
Affiliation(s)
- Y B Xu
- Agronomy Department, Zhejiang Agricultural University, 310029, Hangzhou, China
| | | |
Collapse
|
37
|
Persson BN, Ping JG, Xu YB, Frankel D, Chen Y, Lapeyre GJ. Inelastic scattering of electrons from accumulation and inversion layers. Phys Rev B Condens Matter 1989; 40:7819-7824. [PMID: 9991209 DOI: 10.1103/physrevb.40.7819] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
|
38
|
Li SW, Sun HL, Lu XJ, Zhang SY, Lu FL, Dai JY, Xu YB. [Synthesis of cephalotaxine esters and their antitumor activity (author's transl)]. Yao Xue Xue Bao 1981; 16:821-7. [PMID: 7342677] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/24/2023]
|