检索结果-南通市图书馆

Manure substitution improves maize yield by promoting soil fertility and mediating the microbial community in lime concretion black soil

引用

Journal of Integrative Agriculture 2024年第2期23卷 698-710页

作者： Minghui Cao Yan Duan Minghao Li Caiguo Tang Wenjie Kan jiangye Li Huilan Zhang Wenling Zhong Lifang Wu The Center for Ion Beam Bioengineering&Green Agriculture Hefei Institutes of Physical ScienceChinese Academy of SciencesHefei 230031China University of Science and Technology of China Hefei 230026China Zhongke Taihe Experimental Station Taihe 236626China Institute of Resources and Environment Jiangsu Academy of Agricultural SciencesNanjing 210014China

Synthetic nitrogen(N)fertilizer has made a great contribution to the improvement of soil fertility and productivity,but excessive application of synthetic N fertilizer may cause agroecosystem risks,such as soil acidification,groundwater contamination and biodiversity ***,organic substitution has received increasing attention for its ecologically and environmentally friendly and productivity ***,the linkages between manure substitution,crop yield and the underlying microbial mechanisms remain *** bridge this gap,a three-year field experiment was conducted with five fertilization regimes:i)Control,non-fertilization;CF,conventional synthetic fertilizer application;CF_(1/2)M_(1/2),1/2 N input via synthetic fertilizer and 1/2 N input via manure;CF_(1/4)M_(3/4),1/4 N input synthetic fertilizer and 3/4 N input via manure;M,manure *** fertilization treatments were designed to have equal N *** results showed that all manure substituted treatments achieved high soil fertility indexes(SFI)and productivities by increasing the soil organic carbon(SOC),total N(TN)and available phosphorus(AP)concentrations,and by altering the bacterial community diversity and composition compared with ***,AP,and the soil C:N ratio were mainly responsible for microbial community *** co-occurrence network revealed that SOC and AP had strong positive associations with Rhodospirillales and Burkholderiales,while TN and C:N ratio had positive and negative associations with Micromonosporaceae,*** specific taxa are implicated in soil macroelement *** Forest analysis predicted that both biotic(bacterial composition and Micromonosporaceae)and abiotic(AP,SOC,SFI,and TN)factors had significant effects on crop *** present work strengthens our understanding of the effects of manure substitution on crop yield and provides theoretical support for optimizing fertilization strategies.

关键词： fertilization manure substitution soil fertility maize yield bacterial community

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

Stable-isotope probing of bacterial community for dissolved inorganic carbon utilization in Microcystis aeruginosa-dominated eutrophic water

引用

Journal of Environmental Sciences 2019年第5期31卷 264-272页

作者： Weiguo Zhang jiangye Li Chengcheng Wang Xue Zhou Yan Gao Zhongjun Jia Institute of Agricultural Resources and Environment Jiangsu Academy of Agricultural Sciences Key Lab of Food Quality and Safety of Jiangsu Province-State Key Laboratory Breeding Base China Ministry of Agriculture Key Laboratory at Yangtze River Plain for Agricultural Environment College of Resources and Environmental Sciences Nanjing Agricultural University College of Water Conservancy and Hydropower Engineering Hohai University Institute of Soil Science Chinese Academy of Sciences

Dissolved inorganic carbon(DIC) is an important source of carbon in aquatic ecosystems,especially under conditions of increased frequency of cyanobacterial bloom. However, the importance of bacteria in direct or indirect utilization of DIC has been widely overlooked in eutrophic freshwater. To identify the functional bacteria that can actively utilize DIC in eutrophic freshwater during cyanobacterial bloom, stable-isotope probing(SIP) experiments were conducted on eutrophic river water with or without inoculation with cyanobacteria(Microcystis aeruginosa). Our 16 S rRNA sequencing results revealed the significance of Betaproteobacteria, with similar relative abundance as Alphaproteobacteria, in the active assimilation of H^(13)CO^(3-) into their DNA directly or indirectly, which include autotrophic genera Betaproteobacterial ammonia-oxidizing bacteria. Other bacterial groups containing autotrophic members, e.g. Planctomycetes and Nitrospira, also presented higher abundance among free-living bacteria in water without cyanobacteria. Microcystis aggregates showed a preference for some specific bacterial members that may utilize H^(13)CO^(3-) metabolized by Microcystis as organic matter, e.g. Bacteroidetes(Cytophagales, Sphingobacteriales), and microcystindegrading bacteria Betaproteobacteria(Paucibacter/Burkholderiaceae). This study provides some valuable information regarding the functional bacteria that can actively utilize DIC in eutrophic freshwater.

关键词： Dissolved inorganic carbon Stable isotope probing Eutrophication Microcystis aeruginosa

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

家长教育焦虑现状及其影响因素分析——基于我国中东部5个省市家庭的调查数据

引用

中华家教 2024年第3期 59-71页

作者：尹霞纪江叶石莉钟勤湖北第二师范学院教育科学学院武汉430205 华中科技大学教育科学研究院武汉430205 文华学院信息科学与技术学部武汉430070 武汉黄陂路小学武汉430014 武汉一元路小学武汉430014

随着教育焦虑的话题不断发酵,众多学者对教育焦虑产生的原因进行了探讨,形成了“社会阶层”“教育资源”“考试评价”“独生子女”“教育期望”等命题观点。本研究通过对3298组家庭教育调查数据进行实证分析发现:(1)家庭经济收入越高,... 详细信息

随着教育焦虑的话题不断发酵,众多学者对教育焦虑产生的原因进行了探讨,形成了“社会阶层”“教育资源”“考试评价”“独生子女”“教育期望”等命题观点。本研究通过对3298组家庭教育调查数据进行实证分析发现:(1)家庭经济收入越高,家长教育焦虑越低;家长学历越高,教育焦虑越低;在不同职业类型中,普通工人教育焦虑水平最高。(2)教育资源均衡性在一定程度上影响了家长的教育焦虑水平,已获得优质教育资源的重点学校家长的教育焦虑水平较低,城乡学校家长教育焦虑差异不显著。(3)考试评价制度对家长教育焦虑产生影响,孩子学习成绩好的家长教育焦虑水平较低。(4)独生子女政策及家长教育期望对教育焦虑不产生影响。基于以上结论,在进一步落实“双减”政策中应从深化教育评价改革、均衡学校教育发展、消解教育等级化认知等方面来缓解家长教育焦虑。

关键词：家长教育焦虑教育期望教育资源考试评价

来源：

维普期刊数据库博看期刊

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

农田土壤好氧氨氧化和甲烷氧化交互作用机制的研究进展

引用

西北农业学报 2024年第2期33卷 201-207页

作者：潘红李江叶冯浩杰娄燕宏杨全刚王会诸葛玉平土肥高效利用国家工程研究中心山东农业大学资源与环境学院山东泰安271018 农业资源与环境研究所江苏省农业科学院南京210014

从农田土壤生态系统中硝化和甲烷氧化的研究意义、氨氧化和甲烷氧化的功能微生物演替规律,以及二者交互作用机制三个方面综述了现阶段取得的主要研究成果,并进一步阐述了土壤碳氮元素生物地球化学循环机制研究的科学问题和面临的挑战。... 详细信息

从农田土壤生态系统中硝化和甲烷氧化的研究意义、氨氧化和甲烷氧化的功能微生物演替规律,以及二者交互作用机制三个方面综述了现阶段取得的主要研究成果,并进一步阐述了土壤碳氮元素生物地球化学循环机制研究的科学问题和面临的挑战。未来研究应充分利用学科交叉,结合宏观结果和土壤微观动态过程,揭示土壤中不可培养微生物代谢能力及其在土壤生物地球化学循环中的重要作用,逐步实现对土壤生态过程的预测和调控。

关键词：氨氧化甲烷氧化交互作用氨氧化细菌(AOB) 氨氧化古菌(AOA) 甲烷氧化菌(MOB)

来源：

维普期刊数据库

同方期刊数据库博看期刊评论

在线全文

学校读者我要写书评

暂无评论

全髋与半髋关节置换术治疗老年股骨颈骨折的效果比较

引用

中国实用医刊 2024年第17期51卷 29-32页

作者：侯江业李耀章杨振邦张宁榆林市第一医院骨科榆林

目的比较全髋与半髋关节置换术治疗老年股骨颈骨折的临床疗效。方法回顾性抽取2022年3月至2023年6月榆林市第一医院收治的72例老年股骨颈骨折患者为研究对象。将入选者按电脑盲选法分为半髋组与全髋组, 每组36例。半髋组采用半髋关节置... 详细信息

目的比较全髋与半髋关节置换术治疗老年股骨颈骨折的临床疗效。方法回顾性抽取2022年3月至2023年6月榆林市第一医院收治的72例老年股骨颈骨折患者为研究对象。将入选者按电脑盲选法分为半髋组与全髋组, 每组36例。半髋组采用半髋关节置换术, 全髋组采用全髋关节置换术。比较两组手术相关指标、关节功能恢复情况(Harris评分、关节活动度)及并发症发生率。结果全髋组手术时间、住院时间少于半髋组, 切口长度长于半髋组, 术后引流量多于半髋组, 下地负重时间短于半髋组(P0.05);术后3个月, 全髋组各项评分均高于半髋组(P均0.05);术后第3、6个月, 全髋组各个方向的活动度均大于半髋组(P均<0.05)。全髋组并发症发生率(8.33%, 3/36)低于半髋组(44.44%, 16/36), P<0.05。结论对于老年股骨颈骨折患者的治疗, 全髋置换术虽然创伤较大, 但髋关节功能恢复更佳, 并发症发生率更少, 手术安全性高, 远期疗效显著;半髋关节置换术虽创伤小, 但关节恢复效果不如前者。

关键词：髋关节置换术半髋关节置换术老年股骨颈骨折

来源：

同方期刊数据库评论

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

不同锌肥对土壤镉有效性及小麦镉吸收转运的影响

引用

农业环境科学学报 2024年第1期43卷 19-29页

作者：姚澄周天宇樊广萍周东美史高玲沈文忠张绪美陈未李江叶高岩江苏省农业科学院农业资源与环境研究所南京210014 农业农村部长江下游平原农业环境重点实验室南京210014 南京大学环境学院南京210023 太仓市农业技术推广中心江苏太仓215400

为探究施用锌肥对污染土壤中小麦Cd吸收转运的影响,采用盆栽试验,研究了两种锌肥(常规锌肥、缓释锌肥)及其不同用量(13、26、66 mg·kg-1)对根际土壤Cd、Zn有效性和小麦Cd、Zn吸收转运的影响。结果表明:施用两种锌肥均可显著增加土壤有... 详细信息

为探究施用锌肥对污染土壤中小麦Cd吸收转运的影响,采用盆栽试验,研究了两种锌肥(常规锌肥、缓释锌肥)及其不同用量(13、26、66 mg·kg-1)对根际土壤Cd、Zn有效性和小麦Cd、Zn吸收转运的影响。结果表明:施用两种锌肥均可显著增加土壤有效态Zn含量,但施用缓释锌肥在小麦孕穗期、灌浆期和成熟期对土壤有效态Zn的贡献显著高于常规锌肥,且不同生育期小麦根部和地上部Zn含量高于相应浓度常规锌肥处理。在拔节期,施用常规和缓释锌肥均能有效降低小麦根部Cd含量,Cd含量分别比对照(未施锌肥)降低了23%~33%和3%~48%,且中、高浓度锌肥同时显著降低了根部-地上部Cd转移系数。常规和缓释锌肥对灌浆期和成熟期小麦地上部Cd含量的降幅分别为21%~54%和13%~43%。虽然高浓度缓释锌肥在小麦拔节期、孕穗期和灌浆期显著增加了土壤有效态Cd含量,但却显著降低了小麦灌浆期和成熟期根部-地上部Cd转移系数。施用高浓度常规锌肥也能显著降低小麦成熟期根部-地上部Cd转移系数。所有处理中,仅施用高浓度常规和缓释锌肥显著降低了小麦籽粒中Cd含量,降幅分别为19%和29%。相关性分析显示,在小麦全生育期,小麦根部Zn含量与地上部Cd含量呈负相关关系,并且缓释锌肥处理的小麦成熟期地上部-籽粒Cd转移系数随施Zn浓度的增加而减小,表明施用锌肥能有效抑制小麦对Cd的吸收和转运。施用高浓度锌肥抑制Cd从地上部向籽粒转移的效率仍较低,在中重度Cd污染土壤中单施锌肥不能保证小麦的安全生产,需在小麦Cd吸收关键期组合其他阻控技术措施,以进一步降低Cd在小麦籽粒中的积累。

关键词：小麦镉锌肥镉吸收转运

来源：

维普期刊数据库

同方期刊数据库博看期刊评论

在线全文

学校读者我要写书评

暂无评论

北部湾植物内生真菌的分离及次级代谢产物鉴定

引用

中国抗生素杂志 2024年第5期49卷 510-518页

作者：王诗怡王玉妃刘江晔刘硕李子林刘金燕孔凡栋王聪广西民族大学化学化工学院林产化学与工程国家民委重点实验室广西林产化学与工程重点实验室/协同创新中心广西高校民族医学古方发掘与开发重点实验室广西民族大学南宁530006

目的对北部湾3株药用植物的内生真菌进行研究,研究小叶海金沙内生真菌Spegazzinia ***-573次级代谢产物。方法通过10倍稀释法分离小叶海金沙、野牡丹和莲子草的内生真菌,对小叶海金沙内生真菌Spegazzinia ***-573的次级代谢产物进行... 详细信息

目的对北部湾3株药用植物的内生真菌进行研究,研究小叶海金沙内生真菌Spegazzinia ***-573次级代谢产物。方法通过10倍稀释法分离小叶海金沙、野牡丹和莲子草的内生真菌,对小叶海金沙内生真菌Spegazzinia ***-573的次级代谢产物进行分离纯化,通过NMR、MS、ECD等方法进行结构鉴定,采用DPPH法进行化合物抗氧化活性检测,采用微量二倍稀释法进行抑菌活性测试。结果从3株植物中分离到内生真菌171株,从Spegazzinia ***-573的次级代谢产物中共分离得到异香豆素类化合物3个,其中化合物1为新化合物。化合物1对金黄色葡萄球菌及MRSA、化合物3对MRSA的抑菌活性MIC均为128μg/mL。结论化合物1~3都是首次从斯氏霉属真菌的次级代谢产物分离获得,化合物1是1个新化合物,化合物1和3具有抑菌活性。

关键词：广西北部湾内生真菌 Spegazzinia sp. 次级代谢产物

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

In vitro antitumor immune response induced by fusion of dendritic cells and colon cancer cells

引用

World Journal of Gastroenterology 2004年第8期10卷 1162-1166页

作者： FengXu Ying-jiangye ShanWang Division of Surgical Oncology and Division of Gastrointestinal Surgery People's HospitalPeking University100044 BeijingChina

AIM:The prevention of recurrence of colon cancer (CC) after operation is very important for improvement of the prognosis of CC patients,especially those with micro- *** generation of fused cells between dendritic cells (DCs) and tumor cells maybe an effective approach for tumor antigen presentation in *** this study, we fused human colon caner SW480 cells and human peripheral blood-derived DCs to induce an antitumor activity against human CC. METHODS:CC SW480 cells and human peripheral blood- derived DCs were fused with 500 mL/L polyethylene glycol (PEG). RESULTS:The specific T cell responses activated by fusion cells (FCs),were *** 100 mL/L to 160 mL/L of the PEG-treated non-adherent cells with fluorescences were considered to be dendritomas that highly expressed the key molecules for antigen presentation in our five *** vitro studies showed that fusions effectively activated CD8^+ T lymphocytes to secrete interferon-γ.The early apoptotic ratio of the colon cancer SW480 cells was higher than that of controls,which was affected by cytotoxic T lymphocytes (CTLs) stimulated by dendritomas. CONCLUSION:The data indicate that fusion of tumor cells with DCs is an attractive strategy to induce tumor rejection.

关键词：树突状细胞免疫反应抗肿瘤效应结肠癌肿瘤细胞

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

How Behaviorism Can Help Provide Insight into MOOCs in the Chinese Education Market

引用

Journal of Contemporary Educational Research 2022年第8期6卷 96-101页

作者： jiangye Zhu Xi’an Eurasia University Xi’an 710065Shaanxi ProvinceChina

In recent years,online education has grown rapidly and expanded *** an undergraduate student,the author took part in massive open online courses(MOOCs)as an *** enjoying the convenience of high-tech distance education,the author also became aware of its *** instance,when students are confused about a certain topic,they are unable to clarify with their instructors in real time since most of the time,recorded instructional videos are *** also tend to listen passively during lessons,indicating that they may not absorb information or“positively reinforce”what they know or have *** discussing the characteristics of MOOCs,the author hopes to demonstrate how online education may influence traditional teaching and serves as an excellent complement to conventional classrooms.

关键词： MOOCs High-tech distance education Conventional classroom

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

The secretory Candida effector Sce1 licenses fungal virulence by masking the immunogenicβ-1,3-glucan and promoting apoptosis of the host cells

引用

微生物(英文) 2023年第2期2卷 159-177页

作者： Hongyu Wu Li Wang Wenjuan Wang Zhugui Shao Xin-Ming Jia Hui Xiao jiangye Chen State Key Laboratory of Molecular Biology Shanghai Institute of Biochemistry and Cell BiologyCenter for Excellence in Molecular Cell ScienceChinese Academy of SciencesUniversity of Chinese Academy of SciencesShanghaiChina The Center for Microbes Development and HealthInstitut Pasteur of ShanghaiChinese Academy of SciencesUniversity of Chinese Academy of SciencesShanghaiChina Clinical Medicine Scientific and Technical Innovation Center Shanghai Tenth People's HospitalTongji University School of MedicineShanghaiChina Key Laboratory of Infection and Immunity of Shandong Province and Department of Immunology School of Biomedical SciencesShandong UniversityJinanChina

Candida albicans deploys a variety of mechanisms such as morphological switch and elicitor release to promote ***,the intricate interactions between the fungus and the host remain poorly understood,and a comprehensive inventory of fungal virulence factors has yet to be *** this study,we identified a *** secretory effector protein Sce1,whose induction and secretion are associated with vagina‐simulative conditions and chlamydospore *** alignment showed that Sce1 belongs to a Pir family in ***,which is conserved across several fungi and primarily characterized as aβ‐glucan binding protein in the Saccharomyces ***,Sce1 is primarily localized to the cell wall in a cleaved form as an alkali‐labileβ‐1,3‐glucan binding protein and plays a role in maskingβ‐glucan in acidic environments and chlamydospores,a feature that might underline ***'ability to evade host ***,a cleaved short form of Sce1 protein could be released into extracellular compartments and presented in bone marrow‐derived macrophages infected with *** cleaved short form of Sce1 also demonstrated a unique ability to trigger the caspases‐8/9‐dependent apoptosis in various host ***,genetic deletion of SCE1 led to dampened vaginal colonization of *** and diminished fungal virulence during systemic *** discovery of Sce1 as a versatile virulence effector that executes at various compartments sheds light on the fungus–host interactions and *** pathogenesis.

关键词： apoptosis Candida albicans effector immune evasion β-glucan

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：