检索结果-南通市图书馆

Evidence for fine-scale habitat specialisation in an invasive weed

Journal of Plant Ecology 2018年第2期11卷 189-199页

作者： Daniel Z.Atwater Rebecca A.fletcher Christopher C.Dickinson Andrew H.Paterson Jacob N.Barney Virginia Tech Department of Plant PathologyPhysiology and Weed Science435 Old Glade RoadBlacksburgVA 24061USA University of Georgia Plant Genome Mapping Laboratory111 Riverbend RoadAthensGA 30606USA

Aims As an exotic species colonises a new continent,it must overcome enormous environmental variation in its introduced *** adaptation of introduced species has frequently been observed at the continent scale,particularly in response to latitudinal climatic ***,significant environmental heterogeneity can also exist at the landscape scale.A small number of studies have provided evidence that introduced species may also be capable of phenotypic and genetic differentiation at much smaller spatial *** example,previously we found US agricultural and non-agricultural populations of Sorghum halepense(Johnsongrass)to be phenotypically and genetically *** this study,we inves-tigated whether this phenotypic differentiation of agricultural and non-agricultural populations of *** is the result of fine-scale local *** We surveyed a nationally collected *** germplasm panel and also collected neighbouring agricultural and non-agricultural sub-populations of *** at four sites throughout Western Virginia,USA,raising seedlings in common conditions mimicking both agricultural and non-agricultural *** Findings At the national scale,we found evidence of habitat differentiation but not ***,at the local scale,we found evi-dence of specialisation in two of the four local populations to non-agricultural habitat,but no evidence of specialisation to agricultural *** results show that local specialisation is a possible,but not guaranteed consequence of kilometre-scale habitat heterogen-eity in invasive *** finding contributes to a growing aware-ness of the importance of fine-scale local adaptation in the ecology and management of introduced and weedy species.

关键词： Johnsongrass local adaptation rapid evolution Sorghum halepense(L.)

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

悬崖勒马：日本三菱公司起死回生(一)

引用

汽车与配件 2008年第2期 30-31页

作者： Ian fletcher

2007年10月,三菱公司宣布,连续第七个月在全球的产量增加,销售和利润进一步上升,意义重大,超过了2007/2008全部财政年度的预期。随着数年的剧变,三菱公司发出了明显的信号,最近三年结构重组计划进展良好;不过在全球化的现代汽车工业中... 详细信息

2007年10月,三菱公司宣布,连续第七个月在全球的产量增加,销售和利润进一步上升,意义重大,超过了2007/2008全部财政年度的预期。随着数年的剧变,三菱公司发出了明显的信号,最近三年结构重组计划进展良好;不过在全球化的现代汽车工业中是否可行尚属未知。三菱公司的第二个中期计划,由于要到2008年3月才宣布,是否能在未来持续发展呢?

关键词：日本三菱公司回生悬崖结构重组汽车工业持续发展全球化利润

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

Edge Effects in Small Forest Fragments: Why More Is Better?

引用

American Journal of Plant Sciences 2012年第7期3卷 869-878页

作者： Milind Bunyan Shibu Jose Robert fletcher Department of Wildlife Ecology and Conservation University of Florida Gainesville USA. School of Forest Resources and Conservation University of Florida Gainesville USA The Center for Agroforestry School of Natural Resources University of Missouri Columbia USA

Edge to interior gradients in forest fragments can influence the species composition and community structure as a result of variations in microenvironment and edaphic variables. We investigated the response of microenvironment and edaphic variables to distance from a tropical montane forest (locally known as shola)-grassland edge using one-edge and multiple-edge models. The edpahic variables did not show any differences between the grassland and shola soils. We observed that conventional one-edge models sufficiently explained variation trends in microenvironment along the edge to interior gradient in large fragments. As with other studies on small fragments though, we observed no edge effects with the use of a conventional one-edge model. However, the inclusion of multiple edges in small fragments signifycantly improved model fit. We can conclude that small fragments dominated by edge habitat may in fact resemble larger fragments with the inclusion of multiple edges. Our models did not evaluate non-linear effects which often better explain patterns in edge-interior gradients. The incorporation of such non-linear models in the system might further improve model fit.

关键词： Edge-Interior Gradients Multiple Edges Microenvironment Tropical Montane Forests Shola-Grassland Ecosystem Western Ghats India

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 effect of introduction of misoprostol for induction of labour on pregnancy in gravidas with pre-eclampsia

引用

Open Journal of Obstetrics and Gynecology 2011年第2期1卷 64-69页

作者： Horace fletcher Marvin Reid Nadine Johnson 不详

Misoprostol has revolutionized labour induction since the early 1990’s, because it is inexpensive and very effective. Eclampsia is common unless the pregnancy can be terminated by induction or by caesarean section. This study was done to determine the impact of Misoprostol used for induction of labour, on the outcome in patients with pre-eclampsia (PE) at the University of the West Indies Kingston Jamaica. This was a retrospective analysis of pre-eclamptic women who were managed before and after the introduction of misoprostol into routine usage for induction of labour. We compared 793 women (controls) in the pre misoprostol era (1986-1991) with 709 in the misoprostol era (1993-1998). Outcome variables were the frequency of mild and severe PE, eclampsia, misoprostol and syntocinon inductions, foetal complications and use of caesarean section (CS). Analysis of frequency of eclampsia, neonatal admissions and CS, during the misoprostol years, was also done to eliminate other confounding variables because of the influence of each era. Logistic regression was used to determine the impact of all variables. In comparison to controls, patients induced in the misoprostol years had a greater incidence of severe PE (p < 0.05), neonatal admissions (p = 0.007), foetal distress (p < 0.05);a higher CS rate (p < 0.05);but fewer oxytocin inductions (p < 0.05). However, sub group analysis of the misoprostol years alone, showed a reduction in the incidence of CS, eclampsia, and neonatal admissions in women who were induced with misoprostol (p < 0.05). Logistic regression revealed a lower odds of CS delivery (OR 0.867, 95% confidence interval .02, .37) using misoprostol. These findings suggest that in patients with PE, induction of labor with Misoprostol had a beneficial effect on pregnancy outcome with a decreased incidence of CS, eclampsia and neonatal admissions, but it has not had a significant impact on the main problems in these patients between the two eras as other factors may

关键词： Misoprostol Eclampsia Labour Induction

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

Trithorax Group Proteins Act Together with a Polycomb Group Protein to Maintain Chromatin Integrity for Epigenetic Silencing during Seed Germination in Arabidopsis

引用

Molecular Plant 2018年第5期11卷 659-677页

作者： Fan Xu Tony Kuo Yenny Rosli Mao-Sen Liu Limin Wu Long-Fang Oliver Chen Jennifer C. fletcher Zinmay Renee Sung Li Pu Biotechnology Research Institute Chinese Academy of Agricultural Sciences Beijing 100081 China Department of Plant and Microbial Biology University of California Berkeley CA 94720 USA Institute of Plant and Microbial Biology Academia Sinica Taipei 11529 Taiwan China College of Life and Environmental Sciences Hangzhou Normal University Hangzhou 310036 China

Polycomb group （PcG） and trithorax group （trxG） proteins have been shown to act antagonistically to epigenetically regulate gene expression in eukaryotes. The trxG proteins counteract PcG-mediated floral repression in Arabidopsis, but their roles in other developmental processes are poorly understood. We investigated the interactions between the trxG genes, ARABIDOPSIS HOMOLOG OF TRITHORAX1 （ATX1） and ULTRAPETALA1 （ULT1）, and the PcG gene EMBRYONIC FLOWER 1 （EMF1） during early development. Unexpectedly, we found that mutations in the trxG genes failed to rescue the early-flowering phenotype of emfl mutants. Instead, emfl atxl ultl seedlings showed a novel swollen root phenotype and massive deregulation of gene expression. Greater ectopic expression of seed master regulatory genes in emfl atxl ultl triple than in emfl single mutants indicates that PcG and trxG factors together repress seed gene expression after germination. Furthermore, we found that the widespread gene derepression is asso- ciated with reduced levels of H3K27me3, an epigenetic repressive mark of gene expression, and with globally altered chromatin organization. EMF1, ATXl, and ULT1 are able to bind the chromatin of seed genes and ULT1 can physically interact with ATX1 and EMF1, suggesting that the trxG and EMF1 proteins directly associate at target gene loci for EMFl-mediated gene silencing. Thus, while ATXl, ULT1, and EMF1 interact antagonistically to regulate flowering, they work together to maintain chromatin integrity and prevent precocious seed gene expression after germination.

关键词： trxG PcG histone modification chromatin integrity seed gene repression

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

Conservative treatment of unruptured Ectopic pregnancy in Jamaica

引用

Open Journal of Obstetrics and Gynecology 2011年第1期1卷 6-11页

作者： Horace fletcher Keisha Buchanan Lennox Jacob Department of Obstetrics and Gynaecology University of the West Indies

Medical treatment with methotrexate is now successfully replacing conservative surgical treatment in selected patients. We reviewed patients treated with methotrexate, compared to salpingectomy and salpingostomy between 1990 to 1995 and 2000 to 2003. For 1990-1995 there were 21 conservative surgical treatments (5.3% ectopic pregnancies). The ratio of ectopic to normal deliveries was 1:24. Medical treatment was done for 19 pregnancies (3.4% of ectopic pregnancies) for 2000 to 2003. During the period there was an ectopic rate of 1:16.8 births. Patients treated medically were similar to those treated surgically except that none reportedly having rebound tenderness and only 1/18 having an ultrasound scan showing a foetal heart and none with a gestational sac >4cm. In the medically treated group the success rate was 68% while in the surgically treated groups success was 100%. There was no significant difference in the parameters in the conservative surgical and medically treated

关键词： Conservative treatment ectopic pregnancy methotrexate linear salpingostomy

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

Epstein-Barr virus infection mechanisms

引用

Chinese Journal of Cancer 2014年第11期33卷 545-548页

作者： Liudmila S.Chesnokova Lindsey M.Hutt-fletcher Department of Microbiology and Immunology Center for Molecular Tumor Virology and Feist-Weiller Cancer CenterLouisiana State University Health Sciences CenterShreveportLA 71130USA

Epstein-Barr virus(EBV) infection occurs by distinct mechanisms across different cell types. EBV infection of B cells in vitro minimally requires 5 viral glycoproteins and 2 cellular proteins. By contrast, infection of epithelial cells requires a minimum of 3 viral glycoproteins, which are capable of interacting with one or more of 3 different cellular proteins. The full complement of proteins involved in entry into all cell types capable of being infected in vivo is unknown. This review discusses the events that occur when the virus is delivered into the cytoplasm of a cell, the players known to be involved in these events, and the ways in which these players are thought to function.

关键词：病毒感染机制蛋白质相互作用病毒糖蛋白细胞类型细胞蛋白上皮细胞 EBV

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

设计/建筑方式及其合同条件

引用

建筑经济 2000年第12期21卷 21-23页

作者：阎长俊 Matthew fletcher 沈阳建工学院 Faculty

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

加工中国科学家写的英语生物医学研究论文的经验

引用

编辑学报 1995年第4期 239-241页

作者：钱寿初 ,Cathy fletcher Scientific Officer Infection & Immunity. The Wellcome Trust Infection and Immunity section 183 Euston Road London

为了认识中国生物医学科学家写英语研究论文所碰到的主要问题,找到解决这些问题的途径,由英语为母语的科学家加工190篇论文,并分析写作中的错误。作者均讲国语(汉语普通话)和英语。加工过的稿件退给作者,并同他们用英语讨论。许多论文... 详细信息

为了认识中国生物医学科学家写英语研究论文所碰到的主要问题,找到解决这些问题的途径,由英语为母语的科学家加工190篇论文,并分析写作中的错误。作者均讲国语(汉语普通话)和英语。加工过的稿件退给作者,并同他们用英语讨论。许多论文写得不够清楚。写作问题有两类:文章组织结构和英语语法。突出的是论文摘要结构不当,结果部分写作混乱。几乎每篇文章有语法错误,包括定冠词与不定冠词误用、动词时态错误、名词单复数不分。同作者讨论修改内容,许多作者知道动词时态、冠词误用,但不明白与数一致相关的模糊和准确问题。中国科学家写英语论文存在结构问题,英语语言学方面特殊障碍。解决办法是编辑同作者一起讨论加工过的稿子。

关键词：英语动词时态不定冠词语法错误生物医学研究中华人民共和国

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

A TDG/CBP/RARα Ternary Complex Mediates the Retinoic Acid-dependent Expression of DNA Methylation-sensitive Genes

引用

Genomics, Proteomics & Bioinformatics 2014年第1期12卷 8-18页

作者： Hélène Léger Caroline Smet-Nocca Amel Attmane-Elakeb Sara Morley-fletcher Arndt G.Benecke Sebastian Eilebrecht Vaccine Research Institute INSERM U955Institut Mondor de Recherche Biomédicale Institut des Hautes tudes Scientifiques Unité de Glycobiologie Structurale et Fonctionnelle–CNRS UMR 8576 Group of NMR and Structural BiologyUniversité Lille 1 Unité de Glycobiologie Structurale et Fonctionnelle–CNRS UMR 8576 Neuroplasticity TeamUniversité Lille 1 CNRS UMR 7224 Université Pierre et Marie Curie

The thymine DNA glycosylase （TDG） is a multifunctional enzyme,which is essential for embryonic *** mediates the base excision repair （BER） of G：T and G：U DNA mismatches arising from the deamination of 5-methyl cytosine （5-MeC） and cytosine,*** studies have pointed at a role of TDG during the active demethylation of 5-MeC within CpG *** interacts with the histone acetylase CREB-binding protein （CBP） to activate CBP-dependent *** addition,TDG also interacts with the retinoic acid receptor α （RARα）,resulting in the activation of RARα target *** we provide evidence for the existence of a functional ternary complex containing TDG,CBP and activated RARα.Using global transcriptome profiling,we uncover a coupling of de novo methylation-sensitive and RA-dependent transcription,which coincides with a significant subset of CBP target *** introduction of a point mutation in TDG,which neither affects overall protein structure nor BER activity,leads to a significant loss in ternary complex stability,resulting in the deregulation of RA targets involved in cellular networks associated with DNA replication,recombination and *** thus demonstrate for the first time a direct coupling of TDG＇s epigenomic and transcription regulatory function through ternary complexes with CBP and RARα.

关键词： CREB-binding protein Thymine DNA glycosylase Retinoic acid receptor α Transcription regulation Cytosine DNA methylation Epigenomics

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

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：