检索结果-南通市图书馆

Grazing effects on vegetation dynamics in the savannah ecosystems of the Sahel

Ecological Processes 2023年第1期12卷 752-763页

作者： Haftay Hailu Gebremedhn Ousmane Ndiaye Sylvanus Mensah cofélas fassinou Simon Taugourdeau Torbern Tagesson Paulo Salgado African Center of Excellence for Climate-Smart Agriculture and Biodiversity Conservation Haramaya UniversityP.O.Box 138Dire DawaEthiopia Dispositif en Partenariat«Pôle Pastoralisme Et Zones Sèches» Route du Front de Terre BP 2057Pôle de Recherche de HannISRADakarSenegal Centre de Recherches Zootechniques de Dahra Institut Sénégalais de Recherches AgricolesDakarSenegal Laboratoire de Biomathématiques et d’Estimations Forestières Facultédes Sciences AgronomiquesUniversitéd’Abomey-CalaviCotonouBenin Chair of Forest Growth and Dendroecology Albert-Ludwigs-Universität FreiburgFreiburg Im BreisgauGermany Facultédes Sciences et Techniques Département BVUniversitéCheikh-Anta-DiopDakarSenegal UMR SELMET CIRADINRAEInstitut Agro Univ MontpellierMontpellierFrance Department of Physical Geography and Ecosystem Science Lund UniversitySölvegatan 1222362 LundSweden Department of Geosciences and Natural Resource Management University of CopenhagenØster Voldgade 101350 CopenhagenDenmark

Background The savannah ecosystems of Sahel have experienced continuous and heavy grazing of livestock for centuries but still,their vegetation response to grazing pressure remains poorly *** this study,we analysed the herbaceous plant dynamics,measured by species diversity,composition,cover,and biomass in response to grazing pressure in the savannah ecosystems of *** Senegal,we selected four savannah sites represented with high,moderate,light and no grazing intensity *** survey methods were used for sampling the vegetation data within each of the *** richness and composition were analysed using species accumulation curve and multivariate ***,we used General Linear Models and a piecewise Structural Equation Model(pSEM)to examine the relationships between grazing intensity,vegetation cover,diversity and *** The herbaceous species diversity and composition varied significantly among the different grazing intensity levels(p<0.001).The plant species composition shifted from the dominance of grass cover to the dominance of forb cover with increasing grazing ***,the attributes of species diversity,herbaceous biomass,and ground cover were higher on sites with low grazing than sites with high and moderate grazing *** all sites,species diversity was positively related to total *** pSEM explained 37%of the variance in total biomass and revealed that grazing intensity negatively influenced total biomass both directly and indirectly through its negative influence on species *** Managing grazing intensity may lead to higher plant production and higher mixed forage establishment in the dryland savannah *** information can be used to support land management strategies and promote sustainable grazing practices that balance the needs of livestock with the conservation of ecosystem health and biodiversity.

关键词： Biomass Biodiversity Diodella sarmentosa Forb Grazing intensity Invasive species Pastoral ecosystem Senegal West Africa

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Evaluation of Agricultural Contamination Level by Heavy Metals and Pesticides in Sediments of Rivers and Water Bodies for Shrimp Fishing in the Lower Ouémé: Case of the Aguigadji, Ahlan and Sele Stations in Benin

引用

Advances in Materials Physics and Chemistry 2024年第2期14卷 25-46页

作者： Souradjou Orou Goura Fadéby Modeste Gouissi Armelle Sabine Yélignan Hounkpatin Wakili Bolatito Yessoufou Tayéwo Sylvain Biaou Nonvignon Martial fassinou Laboratory of Ecology Health and Animal Production (LESPA) Faculty of Agronomy (FA) University of Parakou (UP) Parakou Bénin Pluridisciplanary Research Laboratory for Technical Education (LARPET) University of Sciences Technologies Engineering and Mathematics of Abomey (UNSTIM) Lokossa Bénin

This study assessed sediment contamination by heavy metals and pesticide active ingredients linked to chemical inputs used in agricultural activities in the lower Ouémé. Pesticide residues from the organochlorine, pyrethroid and organophosphorus families were investigated by gas chromatography, and heavy metals (Cd, Pb, As, Ni, Zn, Fe, Mg, Cr and Hg) by atomic absorption spectrophotometry. The metallic pollution indices, the contamination factor (CF) and the ecological risk index were calculated. The results revealed 8 active ingredients in the rainy season and 9 in the dry season. Glyphosate was the active ingredient with the highest concentration at all stations, 9.65 ± 0.84 mg/kg recorded in the dry season at the Aguigadji station. All glyphosate values were above the EQS. DDT, Atrazine and Endosulfan also showed high concentrations in the dry and rainy seasons. Emamectin, Abamectin and Lambda Cyhalothrin also showed high concentrations in the dry season at Aguigadji, Ahlan and Sele. Only glyphosate was recorded at the control station (Toho), but in very low concentrations. Lead showed the highest concentrations at all the stations, 265.96 ± 21.02 mg/Kg in the rainy season and 255.38 ± 79.09 mg/Kg in the dry season, all detected at the Aguigadji station and above the EQS. Zn, Ni, Fe, Cu and Cr were all representative in both the dry and rainy seasons at the contaminated stations. Manganese showed high concentrations in the rainy season. Pb showed very high contamination (FC ≥ 6) at the Aguigadji and Ahlan stations and significant contamination (3 ≤ FC 6) at the Sele station in both the rainy and dry seasons. Ni, Hg and Cd, showed either moderate or significant contamination at the contaminated stations. The risk values showed a considerable ecological Ri (190 ≤ Ri < 380) in the rainy season and a moderate ecological Ri (95 ≤ Ri < 190) in the dry season at these contaminated stations.

关键词： Pesticides Heavy Metals Sediments Shrimp Fishing Area Lower Ouémé

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Impact of Dewatering on the Spatio-Temporal Distribution of Benthic Macroinvertebrate Communities in the Okpara River, Benin

引用

Journal of Geoscience and Environment Protection 2024年第2期12卷 30-43页

作者： Sylvain Tayéwo Biaou Fadéby Modeste Gouissi Armelle Sabine Yélignan Hounkpatin Zoulkanerou Orou Piami Wakili Bolatito Yessoufou Souradjou Orou Goura Nonvignon Martial fassinou Laboratory of Ecology Health and Animal Production (LESPA) Faculty of Agronomy (FA) University of Parakou (UP) Parakou Benin Pluridisciplanary Research Laboratory for Technical Education (LARPET) University of Sciences Technologies Engineering and Mathematics of Abomey (UNSTIM) Lokossa Benin

Surface watercourses are areas of very high ecological and heritage value. Macroinvertebrates are bioindicators of the health of aquatic ecosystems. The aim of this study was to assess the effects of dewatering and re-watering cycles on benthic macroinvertebrate (BMI) communities. Two data collections were carried out at two stations (Okpara 1 and Okpara 2) on the Okpara river before and after dewatering. Thus, 8 samples of benthic macroinvertebrates and 12 physico-chemical parameters (T°C, pH, Transparency, Depth, Conductivity, Dissolved Oxygen that were measured in situ, and BOD5, COD, NH4+, NO3-, NO2- and PO43-) were assayed in the laboratory. Canonical Correspondence Analysis (CCA) was used to match physico-chemical data to MIB families. Shannon and Piélou diversity indices were used to determine the effects of dewatering on MIBs. The increase in temperature values of pH, BOD5, COD, NH4+, NO3-, NO2- and PO43-, after re-watering indicates the effect of dewatering on the quality of Okpara aquatic ecosystems. The benthic macrofauna collected consisted of 62.42% insects, 0.65% crustaceans, 6.48% molluscs, 0.72% worms and 0.14% arachnids. Whereas after re-watering, 21.67% insects, 0% crustaceans, 0.22% molluscs, 7.56% worms and 0.29% arachnids were recorded. Insects, crustaceans and molluscs were more abundant before dewatering than after. This was revealed by low abundances and taxonomic richness, as well as low Shannon index values of samples collected after re-watering.

关键词： Dewatering Benthic Macroinvertebrates Impact Physico-Chemical Parameters Okpara Rivers Nord-Benin

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Agricultural Contamination of the Surface Waters of the Upper Ouémé in Benin: The Case of Heavy Metals and Pesticides

引用

Journal of Agricultural Chemistry and Environment 2024年第1期13卷 83-99页

作者： Armelle Sabine Yélignan Hounkpatin Nonvignon Martial fassinou Fadéby Modeste Gouissi Zoulkanerou Orou Piami Dossou Armel Géraldo Houndeton Souradjou Orou Goura Wakili Bolatito Yessoufou Tayéwo Sylvain Biaou Laboratory of Hygiene Sanitation Toxicology and Environmental Health (HECOTES) The Training Centre Interfacultaire and Environmental Research for Sustainable Development (CIFRED) of the University of Abomey (UAC) Cotonou Benin Plurildisciplinary Research Laboratory for Technical Education (LARPET) of the University of Sciences Technologies Engineering and Mathematics of Abomey (UNSTIM) Lokossa Benin Laboratoire d’Ecologie de Santé et de Productions Animales (LESPA) Faculté d’Agronomie (FA) Université de Parakou (UP) Parakou Bénin

Objective: The main objective of this study was to assess the degree of contamination of surface waters by heavy metals and pesticides. Method: To this end, data were collected in December 2022 from four specific sampling stations: Okpara, Térou, Affon and Adjiro. Levels of heavy metals, including cadmium, chromium, copper, iron, mercury, nickel and lead, were measured and subjected to in-depth statistical analysis using graphical summation models. In addition, the concentrations of pesticide active ingredients present in the samples were interpreted and evaluated. The statistical data collected during this study were processed using R software, version 3.5.0. Results: The values obtained at the different stations Okpara, Térou, Affon and Adjiro are respectively Arsenic (2 × 10-4 mg/L;2.2 × 10-1 mg/L;1.2 × 10-4 mg/L;2 × 10-4 mg/L), Cadmium (4.4 × 10-5 mg/L;1.1 × 10-2 mg/L;10-4 mg/L;4 × 10-4 mg/L). Then Copper (7 × 10-4 mg/L;3 × 10-3 mg/L;7 × 10-4 mg/L;1 × 10-4 mg/L), Iron (1.51 mg/L;6.4 × 10-1 mg/L;2.0012 mg/L;2.9 × 10-1 mg/L), Lead (0 mg/L;0 mg/L;1.5 × 10-3 mg/L;1.5 × 10-3 mg/L). Mercury, nickel and chromium were not detected in surface waters. It is important to note that the values obtained for trace metals (Cadmium, Chromium, Copper, Iron, Mercury, nickel and chromium were not detected in surface waters. It is important to note that the values obtained for trace metals (cadmium, chromium, copper, iron, mercury, nickel and lead) were all below the guideline standards set by the WHO in 2006 for uncontaminated surface waters. This indicates that the surface waters of the Upper Ouémé were below acceptable contamination thresholds in terms of heavy metals. However, the presence of pesticide active ingredients such as cyfluthrin, endosulfan-alpha, endosulfan-beta, profenosfos, tihan, atrazine, g

关键词： Agricultural Contamination Heavy Metals Pesticides Surface Water North Benin

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Sexual dimorphism in the antitumor immune responses elicited by the combination of fasting and chemotherapy

引用

Cancer Communications 2024年第4期44卷 508-513页

作者： Andrés Pastor-Fernández Manuel Montero Gómez de las Heras Jose Ignacio Escrig-Larena Marta Barradas Cristina Pantoja Adrian Plaza Jose Luis Lopez-Aceituno Esther Durán Alejo Efeyan Maria Mittelbrunn Lola Martinez Pablo Jose Fernandez-Marcos Metabolic Syndrome Group(BIOPROMET) Madrid Institute for Advanced Studies(IMDEA)FoodE28049MadridSpain Molecular Biology Center Severo Ochoa(CBMSO) Spanish National Research Council(CSIC)Madrid Autonoma University(UAM)MadridSpain Department of Basic Medical Sciences Institute of Applied Molecular MedicineSchool of MedicineUniversity Studies Center(CEU)-San Pablo UniversityMadridSpain Metabolism and Cell Signaling Laboratory Spanish National Cancer Research Centre(CNIO) MadridSpain 5Flow Cytometry UnitBiotechnology ProgrammeSpanish National Cancer Research Centre(CNIO)MadridSpain

Fasting reduces chemotherapy toxicity[1],enhances immunogenic tumor cell death[2,3]and increases CD8^(+)T cell infiltration in tumors,particularly when combined with chemotherapy[2,3]or immunotherapy[4].More-over,fast... 详细信息

关键词： chemotherapy fasting immune

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Women Breast Cancer: Knowledge, Attitudes, Practices and Factors Associated with Early Screening in the Municipality of Abomey-Calavi in Benin in 2018

引用

Open Journal of Epidemiology 2024年第1期14卷 131-156页

作者： Stéphane Arold Bidossessi Senahoun Nicolas Hamondji Amegan Mahougnon Hugues Serge Dohou Hermann Comlanvi Agbedjinou Lucresse Corine fassinou Tècle Edwige Korogone Armand Ibikounle Dieudonné Fambo Joël Gamêlé Mikponhoué Christiane Tshabu Aguemon Ecole Doctorale des Sciences de la Santé Université d’Abomey-Calavi Cotonou Bénin Ecole de Santé Publique de l’Université de Montréal Québec Canada Unité de Formation et de Recherche en Médecine Cardiovasculaire Faculté de Médecine de l’Université de Parakou Parakou Bénin Ecole de Santé Publique Université Libre de Bruxelles Bruxelles Belgique Ecole Nationale des Techniciens Supérieurs en Santé Publique et en Surveillance Epidémiologique Université de Parakou Parakou Bénin Faculté des Sciences de la Santé Université d’Abomey-Calavi Cotonou Bénin

Background: Breast cancer is the dominant cancer in women in both developed and developing countries. The objective of this study was to assess the knowledge, attitudes, practices and factors associated with early breast cancer screening among women in the Municipality of Abomey-Calavi in Benin. Methods: This was a cross-sectional, descriptive, analytical study with prospective data collection from October 1 to 8, 2018, involving 1740 women in the Municipality of Abomey-Calavi, aged 18 years or older and selected by WHO four-stage random cluster sampling. Consenting women who were mentally competent, 18 years of age or older at the time of the survey, and residing continuously in the Municipality of Abomey-Calavi for the last six months prior to the survey were included. On the other hand, women who belonged to a breast cancer prevention service, women in whom secondary screening was noted, or non-consenting women were not included. The initial minimum size was estimated by the Schwartz formula with a cluster effect of k = 2. Information was collected by questionnaire survey, entered with Epidata 3.1. Fr and analyzed with R Studio 3.5.1. software. Results: The mean age of the women surveyed was 32.0 ± 11.5 years with a range of 18 and 71 years. Regarding knowledge, the clinical manifestation known by the majority of women was the presence of a nodule (68.50%). In the series, 1308 (75.17%) declared having heard about breast cancer once before, either on the radio, television or from friends and 726 (55.50%) had heard about breast cancer screening. Five hundred and twelve (70.52%) of the 726 who had heard of breast cancer said they knew that breast cancer could be screened earlier. Breast self-examination was the most cited screening method (67.58%). The disease is of natural origin according to 37.84% of them. Regarding attitudes and practices, the prevalence of early breast cancer screening was 12.93%, of which 11.67% declared that they had checked themselves to kno

关键词： Breast Cancer Early Screening Knowledge Practices Attitudes Associated Factors

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

新中国成立以来党的政治建设的历史经验

引用

攀登（藏文版） 2024年第3期 7-13页

作者：李智中共青海省委党校藏学研究中心

党的政治建设是中国共产党立党、兴党、强党的保证和有力武器,是中国共产党治国理政有效开展的关键环节。新中国成立以来,中国共产党积累了丰富的关于推进自身政治建设的理论和实践经验:坚持和加强党的全面领导,坚决维护党中央权威和集... 详细信息

党的政治建设是中国共产党立党、兴党、强党的保证和有力武器,是中国共产党治国理政有效开展的关键环节。新中国成立以来,中国共产党积累了丰富的关于推进自身政治建设的理论和实践经验:坚持和加强党的全面领导,坚决维护党中央权威和集中统一领导,打造党的政治建设的核心议题;坚持人民至上;完善党的制度建设,为党的政治建设提供纪律保障;提高党员干部政治能力,建构党的政治建设的基础工程。总结和研究新中国成立以来党的政治建设的历史经验,可以促使这些经验转化为新时代推动党的政治建设的有效力量,对新时代推进党的政治建设具有一定的理论价值和实践意义。

关键词：新中国中国共产党政治建设历史经验

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

不断夯实铸牢中华民族共同体意识的基础

引用

攀登（藏文版） 2024年第2期 22-27页

作者：烈智中共青海省委党校藏学研究中心

党的十八大以来,以习近平同志为核心的党中央站在实现中华民族伟大复兴的战略高度,谋划和部署新时代党的民族工作,提出“铸牢中华民族共同体意识”这一重大决策部署,并将其确立为新时代党的民族工作和民族地区各项工作的主线。这一重大... 详细信息

党的十八大以来,以习近平同志为核心的党中央站在实现中华民族伟大复兴的战略高度,谋划和部署新时代党的民族工作,提出“铸牢中华民族共同体意识”这一重大决策部署,并将其确立为新时代党的民族工作和民族地区各项工作的主线。这一重大理念,丰富和发展了马克思主义民族理论,巩固和拓展了新时代党的民族工作理论和实践创新。推进新时代坚持走中国特色解决民族问题的正确道路,必须把习近平总书记关于加强和改进民族工作的重要思想不折不扣地贯彻到民族领域各个方面、落实到民族工作各个环节,铸牢中华民族共同体意识,为实现中华民族伟大复兴汇聚磅之力。

关键词：铸牢中华民族共同体意识民族工作夯实

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

在新征程上全面推进乡村振兴

引用

攀登（藏文版） 2024年第1期 28-32页

作者：烈智中共青海省委党校藏学研究中心

乡村振兴是建设农业强国的基础性工程,必须落实规划、扎实推进。全面推进乡村振兴,必须通过建立和完善相关制度来推进深化改革,必须以实现农业、农村现代化为根本保障,其关键是激发乡村的内生动力。要确保不发生规模性返贫,抓好防止返... 详细信息

乡村振兴是建设农业强国的基础性工程,必须落实规划、扎实推进。全面推进乡村振兴,必须通过建立和完善相关制度来推进深化改革,必须以实现农业、农村现代化为根本保障,其关键是激发乡村的内生动力。要确保不发生规模性返贫,抓好防止返贫监测,落实帮扶措施,增强内生动力,持续巩固拓展脱贫攻坚成果。要提升乡村产业发展水平、乡村建设水平、乡村治理水平,强化农民增收举措,推进乡村全面振兴不断取得实质性进展、阶段性成果。

关键词：中国式现代化农业强国乡村振兴

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

CXC family of chemokines as prognostic or predictive biomarkers and possible drug targets in colorectal cancer

引用

World Journal of Gastroenterology 2018年第42期24卷 4738-4749页

作者： Sara Cabrero-de las Heras Eva Martínez-Balibrea Program Against Cancer Therapeutic Resistance Catalan Institute of OncologyGermans Trias i Pujol health research institute Program of Predictive and Personalized Cancer Medicine Germans Trias i Pujol health research institute

Colorectal cancer(CRC) is the third most common cancer in men and the second most common cancer in women,worldwide. In the early stages of the disease, biomarkers predicting early relapse would improve survival *** metastatic patients, the use of predictive biomarkers could potentially result in more personalized treatments and better outcomes. The CXC family of chemokines(CXCL1 to 17) are small(8 to 10 kDa) secreted proteins that attract neutrophils and lymphocytes. These chemokines signal through chemokine receptors(CXCR) 1 to *** studies have reported that these chemokines and receptors have a role in either the promotion or inhibition of cancer, depending on their capacity to suppress or stimulate the action of the immune system, *** general terms, activation of the CXCR1/CXCR2 pathway or the CXCR4/CXCR7 pathway is associated with tumor aggressiveness and poor prognosis; therefore,the specific inhibition of these receptors is a possible therapeutic strategy. On the other hand, the lesser known CXCR3 and CXCR5 axes are generally considered to be tumor suppressor signaling pathways, and their stimulation has been suggested as a way to fight *** pathways have been studied in tumor tissues(using immunohistochemistry or measuring mRNA levels)or serum [using enzyme-linked immuno sorbent assay(ELISA) or multiplexing techniques], among other sample types. Common variants in genes encoding for the CXC chemokines have also been investigated as possible biomarkers of the disease. This review summarizes themost recent findings on the role of CXC chemokines and their receptors in CRC and discusses their possible value as prognostic or predictive biomarkers as well as the possibility of targeting them as a therapeutic strategy.

关键词： Biomarkers Treatment Chemotherapy Oxaliplatin Irinotecan Immunotherapy Colorectal cancer CXC chemokines Immune system Bevacizumab

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

欢迎您,

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案：

请选择收藏分类：

通借通还

欢迎您,

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：