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Zhang XX, Lv QB, Yan QL, Zhang Y, Guo RC, Meng JX, Ma H, Qin SY, Zhu QH, Li CQ, Liu R, Liu G, Li SH, Sun DB, Ni HB. A Catalog of over 5,000 Metagenome-Assembled Microbial Genomes from the Caprinae Gut Microbiota. Microbiol Spectr 2022; 10:e0221122. [PMID: 36321901 PMCID: PMC9769736 DOI: 10.1128/spectrum.02211-22] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/13/2022] [Accepted: 10/10/2022] [Indexed: 12/24/2022] Open
Abstract
Most microbiome studies regarding the ruminant digestive tract have focused on the rumen microbiota, whereas only a few studies were performed on investigating the gut microbiota of ruminants, which limits our understanding of this important component. Herein, the gut microbiota of 30 Caprinae animals (sheep and goats) from six provinces in China was characterized using ultradeep (>100 Gbp per sample) metagenome shotgun sequencing. An inventory of Caprinae gut microbial species containing 5,046 metagenomic assembly genomes (MAGs) was constructed. Particularly, 2,530 of the genomes belonged to uncultured candidate species. These genomes largely expanded the genomic repository of the current microbes in the Caprinae gut. Several enzymes and biosynthetic gene clusters encoded by these Caprinae gut species were identified. In summary, our study extends the gut microbiota characteristics of Caprinae and provides a basis for future studies on animal production and animal health. IMPORTANCE We constructed a microbiota catalog containing 5,046 MAGs from Caprinae gut from six regions of China. Most of the MAGs do not overlap known databases and appear to be potentially new species. We also characterized the functional spectrum of these MAGs and analyzed the differences between different regions. Our study enriches the understanding of taxonomic, functional, and metabolic diversity of Caprinae gut microbiota. We are confident that the manuscript will be of utmost interest to a wide range of readers and be widely applied in future research.
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Affiliation(s)
- Xiao-Xuan Zhang
- College of Veterinary Medicine, Qingdao Agricultural University, Qingdao, Shandong Province, China
- Heilongjiang Provincial Key Laboratory of the Prevention and Control of Bovine Diseases, College of Animal Science, Heilongjiang Bayi Agriculture University, Daqing, Heilongjiang Province, China
- Key Laboratory of Bovine Disease Control in Northeast China, Ministry of Agriculture and Rural affairs of the People's Republic of China, Heilongjiang Provincial Key Laboratory of Prevention and Control of Bovine Diseases, College of Animal Science and Veterinary Medicine, Heilongjiang Bayi Agricultural University, Daqing, China
| | - Qing-Bo Lv
- College of Veterinary Medicine, Qingdao Agricultural University, Qingdao, Shandong Province, China
- Heilongjiang Provincial Key Laboratory of the Prevention and Control of Bovine Diseases, College of Animal Science, Heilongjiang Bayi Agriculture University, Daqing, Heilongjiang Province, China
- Key Laboratory of Bovine Disease Control in Northeast China, Ministry of Agriculture and Rural affairs of the People's Republic of China, Heilongjiang Provincial Key Laboratory of Prevention and Control of Bovine Diseases, College of Animal Science and Veterinary Medicine, Heilongjiang Bayi Agricultural University, Daqing, China
| | - Qiu-Long Yan
- Department of Microbiology, College of Basic Medical Sciences, Dalian Medical University, Dalian, Liaoning Province, China
| | - Yue Zhang
- Puensum Genetech Institute, Wuhan, Hubei Province, China
| | - Ruo-Chun Guo
- Puensum Genetech Institute, Wuhan, Hubei Province, China
| | - Jin-Xin Meng
- College of Veterinary Medicine, Qingdao Agricultural University, Qingdao, Shandong Province, China
| | - He Ma
- College of Veterinary Medicine, Qingdao Agricultural University, Qingdao, Shandong Province, China
| | - Si-Yuan Qin
- Key Laboratory of Zoonosis Research, Ministry of Education, College of Veterinary Medicine, Jilin University, Changchun, Jilin Province, China
- Center for Biological Disaster Prevention and Control, National Forestry and Grassland Administration, Shenyang, Liaoning Province, China
| | - Qing-He Zhu
- Heilongjiang Provincial Key Laboratory of the Prevention and Control of Bovine Diseases, College of Animal Science, Heilongjiang Bayi Agriculture University, Daqing, Heilongjiang Province, China
- Key Laboratory of Bovine Disease Control in Northeast China, Ministry of Agriculture and Rural affairs of the People's Republic of China, Heilongjiang Provincial Key Laboratory of Prevention and Control of Bovine Diseases, College of Animal Science and Veterinary Medicine, Heilongjiang Bayi Agricultural University, Daqing, China
| | - Chun-Qiu Li
- Heilongjiang Provincial Key Laboratory of the Prevention and Control of Bovine Diseases, College of Animal Science, Heilongjiang Bayi Agriculture University, Daqing, Heilongjiang Province, China
- Key Laboratory of Bovine Disease Control in Northeast China, Ministry of Agriculture and Rural affairs of the People's Republic of China, Heilongjiang Provincial Key Laboratory of Prevention and Control of Bovine Diseases, College of Animal Science and Veterinary Medicine, Heilongjiang Bayi Agricultural University, Daqing, China
| | - Rui Liu
- College of Veterinary Medicine, Qingdao Agricultural University, Qingdao, Shandong Province, China
| | - Gang Liu
- College of Veterinary Medicine, Qingdao Agricultural University, Qingdao, Shandong Province, China
| | - Sheng-Hui Li
- Puensum Genetech Institute, Wuhan, Hubei Province, China
- College of Food Science and Nutritional Engineering, China Agricultural University, Beijing, China
| | - Dong-Bo Sun
- Heilongjiang Provincial Key Laboratory of the Prevention and Control of Bovine Diseases, College of Animal Science, Heilongjiang Bayi Agriculture University, Daqing, Heilongjiang Province, China
- Key Laboratory of Bovine Disease Control in Northeast China, Ministry of Agriculture and Rural affairs of the People's Republic of China, Heilongjiang Provincial Key Laboratory of Prevention and Control of Bovine Diseases, College of Animal Science and Veterinary Medicine, Heilongjiang Bayi Agricultural University, Daqing, China
| | - Hong-Bo Ni
- College of Veterinary Medicine, Qingdao Agricultural University, Qingdao, Shandong Province, China
- Key Laboratory of Bovine Disease Control in Northeast China, Ministry of Agriculture and Rural affairs of the People's Republic of China, Heilongjiang Provincial Key Laboratory of Prevention and Control of Bovine Diseases, College of Animal Science and Veterinary Medicine, Heilongjiang Bayi Agricultural University, Daqing, China
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Lv LJ, Li SH, Wen JY, Wang GY, Li H, He TW, Lv QB, Xiao MC, Duan HL, Chen MC, Yi ZT, Yan QL, Yin AH. Deep metagenomic characterization of gut microbial community and function in preeclampsia. Front Cell Infect Microbiol 2022; 12:933523. [PMID: 36189343 PMCID: PMC9515455 DOI: 10.3389/fcimb.2022.933523] [Citation(s) in RCA: 8] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/01/2022] [Accepted: 08/26/2022] [Indexed: 11/13/2022] Open
Abstract
Preeclampsia (PE) is a pregnancy complication characterized by severe hypertension and multiple organ damage. Gut microbiota has been linked to PE by previous amplicon sequencing studies. To resolve the PE gut microbiota in a higher taxonomy resolution, we performed shotgun metagenomic sequencing on the fecal samples from 40 early-onset PE and 37 healthy pregnant women. We recovered 1,750 metagenome-assembled genomes (representing 406 species) from the metagenomic dataset and profiled their abundances. We found that PE gut microbiota had enriched in some species belonging to Blautia, Pauljensenia, Ruminococcus, and Collinsella and microbial functions such as the bacitracin/lantibiotics transport system, maltooligosaccharide transport system, multidrug efflux pump, and rhamnose transport system. Conversely, the gut microbiome of healthy pregnant women was enriched in species of Bacteroides and Phocaeicola and microbial functions including the porphyrin and chlorophyll metabolism, pyridoxal-P biosynthesis, riboflavin metabolism, and folate biosynthesis pathway. PE diagnostic potential of gut microbial biomarkers was developed using both species and function profile data. These results will help to explore the relationships between gut bacteria and PE and provide new insights into PE early warning.
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Affiliation(s)
- Li-Juan Lv
- Medical Genetic Center, Guangdong Women and Children Hospital, Guangzhou, China
| | | | - Ji-Ying Wen
- Department of Obstetric, Guangdong Women and Children Hospital, Guangzhou, China
| | - Guang-Yang Wang
- Department of Microbiology, College of Basic Medical Sciences, Dalian Medical University, Dalian, China
| | - Hui Li
- Department of Obstetric, Guangdong Women and Children Hospital, Guangzhou, China
| | - Tian-Wen He
- Medical Genetic Center, Guangdong Women and Children Hospital, Guangzhou, China
| | - Qing-Bo Lv
- Puensum Genetech Institute, Wuhan, China
| | - Man-Chun Xiao
- Department of Microbiology, College of Basic Medical Sciences, Dalian Medical University, Dalian, China
| | - Hong-Li Duan
- Department of Obstetric, Guangdong Women and Children Hospital, Guangzhou, China
| | - Min-Chai Chen
- Medical Genetic Center, Guangdong Women and Children Hospital, Guangzhou, China
| | - Zhou-Ting Yi
- Department of Obstetric, Guangdong Women and Children Hospital, Guangzhou, China
| | - Qiu-Long Yan
- Department of Microbiology, College of Basic Medical Sciences, Dalian Medical University, Dalian, China
- *Correspondence: Ai-Hua Yin, ; Qiu-Long Yan,
| | - Ai-Hua Yin
- Medical Genetic Center, Guangdong Women and Children Hospital, Guangzhou, China
- *Correspondence: Ai-Hua Yin, ; Qiu-Long Yan,
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Zheng N, Li SH, Dong B, Sun W, Li HR, Zhang YL, Li P, Fang ZW, Chen CM, Han XY, Li B, Zhang SY, Xu M, Zhang GX, Xin Y, Ma YF, Wan XY, Yan QL. Comparison of the gut microbiota of short-term and long-term medical workers and non-medical controls: a cross-sectional analysis. Clin Microbiol Infect 2020; 27:1285-1292. [PMID: 33160036 DOI: 10.1016/j.cmi.2020.10.033] [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] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/07/2019] [Revised: 07/13/2020] [Accepted: 10/27/2020] [Indexed: 01/03/2023]
Abstract
OBJECTIVES The hospital environment has been implicated in the enrichment and exchange of pathogens and antibiotic resistance, but its potential in shaping the symbiotic microbial community of hospital staff is unclear. This study was designed to evaluate the alteration of the gut microbiome in medical workers compared to non-medical controls. METHODS A prospective cross-sectional cohort study was conducted in the intensive care unit (ICU) and other departments of a centre in north-eastern China. Faecal samples of 175 healthy medical workers-short-term (1-3 months) workers (n = 80) and long-term (>1 year) workers (n = 95)-and 80 healthy non-medical controls were analysed using 16S rRNA amplicon sequencing. The hospital environmental samples (n = 9) were also analysed. RESULTS The gut microbiomes of medical workers exhibited marked deviations in diversity and alteration in microbial composition and function. Short-term workers showed significantly higher abundances of taxa such as Lactobacillus, Butyrivibrio, Clostridiaceae, Clostridium, Ruminococcus, Dialister, Bifidobacterium, Odoribacter, and Desulfovibrio and lower abundances of Bacteroides and Blautia than the controls. Long-term workers showed higher abundances of taxa such as Dialister, Veillonella, Clostridiaceae, Clostridium, Bilophila, Desulfovibrio, Pseudomonas, and Akkermansia and lower abundances of Bacteroides and Coprococcus than the controls. The medical workers' department (ICU versus non-ICU) and position (resident doctor versus nursing staff) also impacted their gut microbiome. Compared with the non-ICU workers, workers in the ICU showed a significant increase in the abundances of Dialister, Enterobacteriaceae, Phascolarctobacterium, Pseudomonas, Veillonella, and Streptococcus and a marked depletion of Faecalibacterium, Blautia, and Coprococcus. In contrast with the nursing staff, the resident doctors showed a significant increase in Erysipelotrichaceae and Clostridium and a decrease in Bacteroides, Blautia, and Ruminococcus in the gut microbiome. Moreover, we found that the microbiota of hospital environments potentially correlated with the workers' gut microbiota. CONCLUSIONS Our findings demonstrated structural changes in the gut microbial community of medical workers.
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Affiliation(s)
- Ning Zheng
- Department of Microbiology, College of Basic Medical Sciences, Dalian Medical University, Dalian, China; Intensive Care Unit, The First Affiliated Hospital of Dalian Medical University, Dalian, China
| | - Sheng-Hui Li
- Shenzhen Puensum Genetech Institute, Shenzhen, China
| | - Bo Dong
- Shenzhen Puensum Genetech Institute, Shenzhen, China
| | - Wen Sun
- Yang-sheng (Health Nurturing) Institute, Beijing University of Chinese Medicine, Beijing, China
| | - Huai-Rui Li
- Department of Anesthesiology, The Second Affiliated Hospital of Dalian Medical University, Dalian, China
| | - Yong-Li Zhang
- Intensive Care Unit, The First Affiliated Hospital of Dalian Medical University, Dalian, China
| | - Peng Li
- Shenzhen Puensum Genetech Institute, Shenzhen, China
| | - Zhi-Wei Fang
- Shenzhen Puensum Genetech Institute, Shenzhen, China
| | - Chang-Ming Chen
- Department of Biochemistry and Molecular Biology, College of Basic Medical Sciences, Dalian Medical University, Dalian, China
| | - Xiu-Yan Han
- Department of Biochemistry and Molecular Biology, College of Basic Medical Sciences, Dalian Medical University, Dalian, China
| | - Bo Li
- Department of Biochemistry and Molecular Biology, College of Basic Medical Sciences, Dalian Medical University, Dalian, China
| | - Si-Yi Zhang
- Department of Biochemistry and Molecular Biology, College of Basic Medical Sciences, Dalian Medical University, Dalian, China
| | - Miao Xu
- Department of Biochemistry and Molecular Biology, College of Basic Medical Sciences, Dalian Medical University, Dalian, China
| | - Gui-Xin Zhang
- General Surgery Department, The First Affiliated Hospital of Dalian Medical University, Dalian, China
| | - Yi Xin
- Department of Biotechnology, College of Basic Medical Sciences, Dalian Medical University, Dalian, China
| | - Yu-Fang Ma
- Department of Microbiology, College of Basic Medical Sciences, Dalian Medical University, Dalian, China; Department of Biochemistry and Molecular Biology, College of Basic Medical Sciences, Dalian Medical University, Dalian, China
| | - Xian-Yao Wan
- Intensive Care Unit, The First Affiliated Hospital of Dalian Medical University, Dalian, China.
| | - Qiu-Long Yan
- Department of Microbiology, College of Basic Medical Sciences, Dalian Medical University, Dalian, China.
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Liu T, Yan QL, Feng L, Ma XC, Tian XG, Yu ZL, Ning J, Huo XK, Sun CP, Wang C, Cui JN. Isolation of γ-Glutamyl-Transferase Rich-Bacteria from Mouse Gut by a Near-Infrared Fluorescent Probe with Large Stokes Shift. Anal Chem 2018; 90:9921-9928. [DOI: 10.1021/acs.analchem.8b02118] [Citation(s) in RCA: 29] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Affiliation(s)
- Tao Liu
- State Key Laboratory of Fine Chemicals, Dalian University of Technology, Dalian 116024, China
| | - Qiu-Long Yan
- College of Pharmacy, Academy of Integrative Medicine, Department of Biochemistry and Molecular Biology, Dalian Medical University, Dalian 116044, China
| | - Lei Feng
- State Key Laboratory of Fine Chemicals, Dalian University of Technology, Dalian 116024, China
- College of Pharmacy, Academy of Integrative Medicine, Department of Biochemistry and Molecular Biology, Dalian Medical University, Dalian 116044, China
- Institute of Functional Materials and Molecular Imaging, College of Emergency and Trauma, Hainan Medical University, Haikou 571199, China
| | - Xiao-Chi Ma
- College of Pharmacy, Academy of Integrative Medicine, Department of Biochemistry and Molecular Biology, Dalian Medical University, Dalian 116044, China
| | - Xiang-Ge Tian
- College of Pharmacy, Academy of Integrative Medicine, Department of Biochemistry and Molecular Biology, Dalian Medical University, Dalian 116044, China
| | - Zhen-Long Yu
- College of Pharmacy, Academy of Integrative Medicine, Department of Biochemistry and Molecular Biology, Dalian Medical University, Dalian 116044, China
| | - Jing Ning
- College of Pharmacy, Academy of Integrative Medicine, Department of Biochemistry and Molecular Biology, Dalian Medical University, Dalian 116044, China
| | - Xiao-Kui Huo
- College of Pharmacy, Academy of Integrative Medicine, Department of Biochemistry and Molecular Biology, Dalian Medical University, Dalian 116044, China
| | - Cheng-Peng Sun
- College of Pharmacy, Academy of Integrative Medicine, Department of Biochemistry and Molecular Biology, Dalian Medical University, Dalian 116044, China
| | - Chao Wang
- College of Pharmacy, Academy of Integrative Medicine, Department of Biochemistry and Molecular Biology, Dalian Medical University, Dalian 116044, China
| | - Jing-Nan Cui
- State Key Laboratory of Fine Chemicals, Dalian University of Technology, Dalian 116024, China
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Yan QL, Tang SY, Xiao YN. Impact of individual behaviour change on the spread of emerging infectious diseases. Stat Med 2017; 37:948-969. [PMID: 29193194 DOI: 10.1002/sim.7548] [Citation(s) in RCA: 23] [Impact Index Per Article: 3.3] [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: 06/05/2017] [Revised: 09/06/2017] [Accepted: 10/06/2017] [Indexed: 11/11/2022]
Abstract
Human behaviour plays an important role in the spread of emerging infectious diseases, and understanding the influence of behaviour changes on epidemics can be key to improving control efforts. However, how the dynamics of individual behaviour changes affects the development of emerging infectious disease is a key public health issue. To develop different formula for individual behaviour change and introduce how to embed it into a dynamic model of infectious diseases, we choose A/H1N1 and Ebola as typical examples, combined with the epidemic reported cases and media related news reports. Thus, the logistic model with the health belief model is used to determine behaviour decisions through the health belief model constructs. Furthermore, we propose 4 candidate infectious disease models without and with individual behaviour change and use approximate Bayesian computation based on sequential Monte Carlo method for model selection. The main results indicate that the classical compartment model without behaviour change and the model with average rate of behaviour change depicted by an exponential function could fit the observed data best. The results provide a new way on how to choose an infectious disease model to predict the disease prevalence trend or to evaluate the influence of intervention measures on disease control. However, sensitivity analyses indicate that the accumulated number of hospital notifications and deaths could be largely reduced as the rate of behaviour change increases. Therefore, in terms of mitigating emerging infectious diseases, both media publicity focused on how to guide people's behaviour change and positive responses of individuals are critical.
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Affiliation(s)
- Q L Yan
- School of Mathematics and Information Science, Shaanxi Normal University, Xi'an, 710062, P.R. China
| | - S Y Tang
- School of Mathematics and Information Science, Shaanxi Normal University, Xi'an, 710062, P.R. China
| | - Y N Xiao
- Department of Applied Mathematics, Xi'an Jiaotong University, Xi'an 710049, P.R. China
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Wang CJ, Yan QL, Ma YF, Sun CP, Chen CM, Tian XG, Han XY, Wang C, Deng S, Ma XC. ent-Abietane and Tigliane Diterpenoids from the Roots of Euphorbia fischeriana and Their Inhibitory Effects against Mycobacterium smegmatis. J Nat Prod 2017; 80:1248-1254. [PMID: 28383891 DOI: 10.1021/acs.jnatprod.6b00786] [Citation(s) in RCA: 32] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
An investigation on the bioactive chemical constituents of the roots of Euphorbia fischeriana has been conducted, with 21 diterpenoids obtained using various chromatographic techniques. On the basis of spectroscopic data analysis, the new compounds were elucidated as four ent-abietane-type diterpenoids (1-4) and four tigliane-type diterpenoids (13-16). Also obtained were eight known ent-abietane (5-12) and five known tigliane (17-21) diterpenoids. The potential antituberculosis effects of these diterpenoids were evaluated using a Mycobacterium smegmatis model. The most potent compound according to the in vitro bioassay used was 17-hydroxyjolkinolide B (12) (MIC 1.5 μg/mL).
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Affiliation(s)
- Chun-Jie Wang
- College of Pharmacy, Academy of Integrative Medicine, and Department of Biochemistry and Molecular Biology, Dalian Medical University , Dalian 116044, People's Republic of China
| | - Qiu-Long Yan
- College of Pharmacy, Academy of Integrative Medicine, and Department of Biochemistry and Molecular Biology, Dalian Medical University , Dalian 116044, People's Republic of China
| | - Yu-Fang Ma
- College of Pharmacy, Academy of Integrative Medicine, and Department of Biochemistry and Molecular Biology, Dalian Medical University , Dalian 116044, People's Republic of China
| | - Cheng-Peng Sun
- College of Pharmacy, Academy of Integrative Medicine, and Department of Biochemistry and Molecular Biology, Dalian Medical University , Dalian 116044, People's Republic of China
| | - Chang-Ming Chen
- College of Pharmacy, Academy of Integrative Medicine, and Department of Biochemistry and Molecular Biology, Dalian Medical University , Dalian 116044, People's Republic of China
| | - Xiang-Ge Tian
- College of Pharmacy, Academy of Integrative Medicine, and Department of Biochemistry and Molecular Biology, Dalian Medical University , Dalian 116044, People's Republic of China
| | - Xiu-Yan Han
- College of Pharmacy, Academy of Integrative Medicine, and Department of Biochemistry and Molecular Biology, Dalian Medical University , Dalian 116044, People's Republic of China
| | - Chao Wang
- College of Pharmacy, Academy of Integrative Medicine, and Department of Biochemistry and Molecular Biology, Dalian Medical University , Dalian 116044, People's Republic of China
| | - Sa Deng
- College of Pharmacy, Academy of Integrative Medicine, and Department of Biochemistry and Molecular Biology, Dalian Medical University , Dalian 116044, People's Republic of China
| | - Xiao-Chi Ma
- College of Pharmacy, Academy of Integrative Medicine, and Department of Biochemistry and Molecular Biology, Dalian Medical University , Dalian 116044, People's Republic of China
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Abstract
Assessing environmental effects of shelter forests is primarily necessary for realizing their greatest protective benefits. The Three-North Shelter Forest Program (TNSFP), the largest ecological afforestation program in the world, has been operated for three decades in China but so far lacks comprehensive assessment of its environmental impacts. Horqin Sandy Land (HSL) in Northeast China is one of the key areas in the TNSFP implementation. To identify the principal contributors to environmental changes in HSL, we evaluated impacts of variations in landscape features, shelter forest areas, climatic factors, and social factors on changes in sandy land areas from 1978 to 2007, by using Gray Relational Analysis. Our analysis showed that during the period 1978 to 2007, the sandy land area decreased by 3.9% in low aeolian dunes, 14.5% in low mountains and hills, and 98.9% in high elevation alluvial flats of HSL. Factors with Gray Correlation Degrees >0.9 were identified as the patch shape index (PSI) and the landscape isolation index (LII) of grasses in low aeolian dunes, PSI of grasses in mountains and hills, and area of broadleaved forests and LII of shrubs in alluvial flats. It is concluded that establishment of the shelter forests has played a significant role in controlling the expansion of sandy land in HSL. To sustain the long-term environmental benefits of the shelter forests in the remaining period for TNSFP construction, suitable tree species should be selected and planted at appropriate densities based on the local precipitation, groundwater and landform conditions, and the system stability of the total landscape.
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Affiliation(s)
- Q L Yan
- Institute of Applied Ecology, Chinese Academy of Sciences, Shenyang 110016, China
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Niu ZY, Liu FZ, Yan QL, Li WC. Effects of different levels of vitamin E on growth performance and immune responses of broilers under heat stress. Poult Sci 2009; 88:2101-7. [PMID: 19762862 DOI: 10.3382/ps.2009-00220] [Citation(s) in RCA: 180] [Impact Index Per Article: 12.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
This experiment was undertaken to evaluate the effect of dietary vitamin E on growth performance and immune response of broilers under heat stress (HS). Birds raised in either a thermoneutral (23.9 degrees C constant) or HS (23.9 to 38 degrees C cycling) environment were fed a corn-soybean meal basal diet supplemented with vitamin E at 0, 100, or 200 mg/kg, respectively. Two hundred forty 1-d-old male broiler chicks were randomly assigned to 6 groups; each group had 4 replicates of 10 birds. Humoral immunity was assessed by i.v. injection of 7% SRBC followed by evaluation of serum for antibody titers in primary and secondary responses. Cell-mediated immunity was assessed by using a Sephadex stimulation method to recruit abdominal exudate cells (AEC) to evaluate macrophage phagocytic ability. Body weight and feed intake were not significantly influenced by dietary vitamin E (P>0.05), whereas feed conversion was significantly affected by vitamin E at 100 mg/kg (P<0.05). Heat stress significantly reduced BW, feed intake, and feed conversion (P<0.05). Numbers of AEC, percentage of macrophages in AEC, phagocytic macrophages, and internalized opsonized and unopsonized SRBC were increased by dietary vitamin E (P<0.05). Both primary and secondary antibody responses were significantly increased by dietary vitamin E when birds were exposed to HS (P<0.05). Lymphoid organ weights, antibody responses, incidence of macrophages in AEC, and phagocytic ability of macrophages were all significantly reduced under HS. These results indicated that HS severely reduced growth performance and immune response of broilers, whereas the immune response of broilers could be improved by dietary vitamin E supplementation under HS.
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Affiliation(s)
- Z Y Niu
- College of Animal Science & Technology, Northwest A&F University, Yangling, Shaanxi 712100, PR China
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Yan QL, Li RQ. [The study of the peritoneal dialyzer with multipriority and its auxiliary spring brush]. Zhongguo Yi Liao Qi Xie Za Zhi 2001; 25:282-302. [PMID: 12583208] [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: 05/24/2023]
Abstract
This paper introduces the design, principle and clinical applications of the peritoneal dialyzer with multipriority and its auxiliary spring-brush.
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Affiliation(s)
- Q L Yan
- Heze Medical College, Shandong Province
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