检索结果-南通市图书馆

Genomics of plant speciation

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Plant Communications 2023年第5期4卷 112-133页

作者： Dan G.Bock Zhe Cai Cassandra Elphinstone Eric Gonza lez-Segovia Kaede Hirabayashi Kaichi Huang Graeme l.Keais Amy Kim gregory l.owens loren H.Rieseberg Department of Botany and Biodiversity Research Centre University of British ColumbiaVancouverBCCanada Department of Biology University of VictoriaVictoriaBCCanada

Studies of plants have been instrumental for revealing how new species *** several decades,botanical research has complemented and,in some cases,challenged concepts on speciation developed via the study of other organisms while also revealing additional ways in which species can ***,the ability to sequence genomes at an unprecedented pace and scale has allowed biologists to settle decades-long debates and tackle other emerging challenges in speciation ***,we review these recent genome-enabled developments in plant *** discuss complications related to identification of reproductive isolation(RI)loci using analyses of the landscape of genomic divergence and highlight the important role that structural variants have in speciation,as increasingly revealed by new sequencing ***,we review how genomics has advanced what we know of some routes to new species formation,like hybridization or whole-genome duplication,while casting doubt on others,like population bottlenecks and genetic *** genomics can fast-track identification of genes and mutations that confer RI,we emphasize that follow-up molecular and field experiments remain ***,genomics has clarified the outsized role of ancient variants rather than new mutations,particularly early during *** conclude by highlighting promising avenues of future *** include expanding what we know so far about the role of epigenetic and structural changes during speciation,broadening the scope and taxonomic breadth of plant speciation genomics studies,and synthesizing information from extensive genomic data that have already been generated by the plant speciation community.

关键词： genomic islands of speciation structural variation hybrid speciation polyploid speciation reproductive isolation standing genetic variation

Semimartingale dynamics for a backward exchange rate process

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Probability, Uncertainty and Quantitative Risk 2024年第3期9卷 371-388页

作者： gregory Gagnon Department of Economics University of Toronto Mississauga3359 Mississauga RoadMississaugaOntarioL5L 1C6Canada

Via a forward SDE solution(k_(t),t≥O)that captures money supply dynamics,a macroeconomic model known as the monetary model generates a backward exchange rate process(y_(t),t≥0).For any t≥0,y_(t)=k_(t)+α^(-1)μ_(t) where(μ_(t),t≥0)is a backward process andα>0 is a ***,(y_(t),t≥O)does not satisfy a conventional *** paper proves(y_(t),t≥O)is a continuous semimartingale when restrictions on the SDE for(k_(t),t≥O)capture anti-inflationary *** new result in economic dynamics does not require the filtration to be the Brownian filtration.

关键词： Backward process Semimartingale Anti-inflationary SDE policy

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Science Bulletin 2024年第7期69卷 850-852页

作者：周晓东 gregory Y.H.lip 郑明华 Department of Cardiovascular Medicine the Heart Centerthe First Affiliated Hospital of Wenzhou Medical UniversityWenzhou 325000China liverpool Centre for Cardiovascular Science at University of liverpool Liverpool John Moores University and Liverpool Heart&Chest HospitalLiverpool L693BXUK Department of Clinical Medicine Aalborg UniversityAalborg 9000Denmark MAFlD Research Center Department of Hepatologythe First Affiliated Hospital of Wenzhou Medical UniversityWenzhou 325000China Institute of Hepatology Wenzhou Medical UniversityWenzhou 325000China Key laboratory of Diagnosis and Treatment for the Development of Chronic liver Disease in Zhejiang Province Wenzhou 325000China

Heart failure with preserved ejection fraction(HFpEF)has an estimated incidence rate of approximately 27 cases per 10,000 person-year[1].Furthermore,the prevalence of HFpEF is on the rise and is expected to exceed that of heart failure with reduced ejection fraction(HFr EF)[2].In the near future,HFpEF is expected to become the predominant subtype of heart failure[2].

关键词： predominant fraction 射血分数保留型

维普期刊数据库

晶粒长大对高纯Al{111}/{111}近奇异晶界的影响

在线全文

学校读者我要写书评

暂无评论

金属学报 2024年第1期60卷 80-94页

作者：冯小铮王卫国 gregory S.Rohrer 陈松洪丽华林燕王宗谱周邦新福建理工大学晶界工程研究所福州350118 福建理工大学材料科学与工程学院福州350118 Department of Materials Science and Engineering Carnegie Mellon UniversityPittsburghPA 15213-3890USA 上海大学材料研究所上海200072

{111}/{111}近奇异晶界较比一般晶界更耐蚀,如何提高此类晶界比例以显著提高Al及其合金晶界腐蚀抗力是一个新课题。本工作选用99.99%(质量分数)高纯Al为研究对象,考察晶粒长大对{111}/{111}近奇异晶界的影响。样品经室温多向锻造和370... 详细信息

{111}/{111}近奇异晶界较比一般晶界更耐蚀,如何提高此类晶界比例以显著提高Al及其合金晶界腐蚀抗力是一个新课题。本工作选用99.99%(质量分数)高纯Al为研究对象,考察晶粒长大对{111}/{111}近奇异晶界的影响。样品经室温多向锻造和370℃再结晶退火后,再经500℃保温不同时间,采用基于EBSD和五参数分析的晶界界面匹配表征方法对样品进行测试和分析。结果表明,随着晶粒长大,{111}/{111}近奇异晶界的比例显著增加。当平均晶粒尺寸由38μm长大至77μm时,{111}/{111}近奇异晶界的比例由3.91%增加至6.56%。离线原位EBSD和晶界迹线分析表明,晶粒长大过程中,{111}/{111}近奇异晶界主要通过具有/θ(θ为取向差转角)取向差关系的两两晶粒吞并周边晶粒并相遇后形成;具有/θ取向差关系的相邻晶粒,其晶界通过再取向调整至{111}/{111}位置,亦可形成此类近奇异晶界。{111}/{111}近奇异晶界存在旋错结构,其原子排列有序度显著高于一般晶界,这是此类晶界比一般晶界更耐蚀的原因。

关键词：高纯Al 晶粒长大近奇异晶界晶界界面匹配

维普期刊数据库

Reduced texaphyrin:A ratiometric optical sensor for heavy metals in aqueous solution

在线全文

学校读者我要写书评

暂无评论

Frontiers of Chemical Science and Engineering 2020年第1期14卷 19-27页

作者： Harrison D.Root gregory Thiabaud Jonathan l.Sessler Department of Chemistry The University of Texas at AustinAustinTX 78712-1224USA

We report here a water-soluble metal cation sensor system based on the as-prepared or reduced form of an expanded porphyrin,*** metal complexation,a change in the redox state of the ligand occurs that is accompanied by a color change from red to *** long employed for synthesis in organic media,we have now found that this complexation-driven redox behavior may be used to achieve the naked eye detectable colorimetric sensing of several number of less-common metal ions in aqueous *** to In(Ⅲ),Hg(Ⅱ),Cd(Ⅱ),Mn(Ⅱ),Bi(Ⅲ),Co(Ⅱ),and Pb(Ⅱ)cations leads to a colorimetric response within 10 *** process is selective for Hg(Ⅱ)under conditions of competitive ***,among the subset of responseproducing cations,In(Ⅲ)proved unique in giving rise to a ratiometric change in the ligand-based fluorescence features,including an overall increase in *** cation selectivity observed in aqueous media stands in contrast to what is seen in organic solvents,where a wide range of texaphyrin metal complexes may be *** formation of metal cation complexes under the present aqueous conditions was confirmed by reversed phase highperformance liquid chromatography,ultra-violet-visible absorption and fluorescence spectroscopies,and highresolution mass spectrometry.

关键词： texaphyrin fluorescent sensor ion-sensing indium mercury

Association between Placental Malaria and Severe Pre-Eclampsia in Two University Hospitals of Yaounde City

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Open Journal of Obstetrics and Gynecology 2024年第9期14卷 1488-1511页

作者： Ayissi gregory Astrid Ruth Ndolo Kondo Ndoumba Afouba Alice Noa Ndoua Claude Cyrille Essiben Félix Meka Esther Belinga Etienne Metogo Junie Engo Engo Samuel Désiré Bodo Edmond lemaire Tchente Nguefack Charlotte Foumane Pascal Mboudou Emile Télésphore Department of Obstetrics and Gynecology Faculty of Medicine and Biomedicals Sciences University of Yaound I Yaounde Cameroon Department of Obstetrics and Gynecology Faculty of Medicine and Pharmaceuticals Sciences University of Douala Douala Cameroon Department of Morphological and Anatomo-Pathological Sciences Faculty of Medicine and Pharmaceutical Sciences University of Dschang Dschang Cameroon. Department of Morphological and Anatomo-Pathological Sciences Faculty of Medicine and Biomedicals Sciences University of Yaound I Yaounde Cameroon

Context: Pre-eclampsia and placental malaria, are two diseases that share pathophysiological similarities, such as placental ischemia, endothelial dysfunction and production of pro-inflammatory cytokines. Objective: The objective of our study was to investigate the association between placental malaria lesions and severe pre-eclampsia. Methodology: We conducted a prospective analytical cross-sectional study in two University Hospitals in the city of Yaounde (Yaounde Central Hospital and the Gynaecological Obstetrics and Paediatrics Hospital), and in the laboratory of the Centre Pasteur in Yaounde over an eight-month period (1st January 2021 – 1st September 2021). All patients with pre-eclampsia diagnosed according to the criteria of the International Society for the Study of Hypertension (ISSHP) and free of chronic metabolic or infectious pathology were included in this study. The patients were divided into two groups: group 1 (mild pre-eclampsia) and group 2: severe pre-eclampsia. Socio-demographic, clinical and histopathological characteristics specific to pre-eclampsia and placental malaria were investigated. Statistical analysis was performed with SPSS 23.0 software, Chi 2 was used to compare categorical variables, Student t-test was used to compare means, and logistic regression was used to assess the association between placental malaria lesions and PES. Results: The mean age of our study population was 29.93 ± 7.36 years versus 28.28 ± 7.18 years in patients with mild and severe pre-eclampsia respectively. Pre-eclampsia placental lesions (accelerated villous maturation, infarction) were significantly greater in patients with severe pre-eclampsia (p Conclusion: Placental malaria lesions were significantly associated with severe pre-eclampsia and increased the risk of developing severe pre-eclampsia placental lesions by a factor of 10.

关键词： Mild Pre-Eclampsia Severe Pre-Eclampsia Malaria Placental lesions Association

Transcranial electrical stimulation in neurological disease

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Neural Regeneration Research 2022年第10期17卷 2221-2222页

作者： gregory l.Brown Michael T.Brown Neurished HersheyPAUSA

Increased lifespan is one of society’s greatest achievements,but this longevity increases the prevalence of diseases of aging,such as neurological ***,neurological disorders are the leading cause of disability and the second leading cause of deaths(Feigin et al.,2019).Furthermore,these diseases affect people in low-,medium-,and high-income countries(Feigin et al.,2019).Current technology to modify neurological burden is scarce,which poses numerous challenges for healthcare,global policy,and economic stability(Feigin et al.,2019).To face these challenges,brain stimulation technology,such as transcranial electrical stimulation(TES),has displayed exciting *** et al.(2017)provide a detailed overview of the safety and application of ***,electrodes are attached to the head and a weak current(e.g.,1-2 mA)is applied through the scalp,skull,and into the brain for 10-30 minutes to activate neurons(Antal et al.,2017).The technique is extremely safe with no serious adverse effects reported from thousands of sessions(Antal et al.,2017).The most common side effects are a tingling/itching sensation or redness at the stimulation site(Antal et al.,2017).However,these side effects can be minimized by reducing the electrode-skin impedance,slowly ramping up and ramping down TES,or using topical analgesics(Antal et al.,2017).The development of TES may repair neural dysfunction and stem the oncoming incidence of neurodegenerative disease.

关键词： stimulation sensation electrical

维普期刊数据库

limbic system as immune tissue

在线全文

学校读者我要写书评

暂无评论

Acta Pharmacologica Sinica 1999年第5期 80-81页

作者： gregory l FRICCHIONE Boston MA 02215 USA Brigham and Women’s Hospital Harvard Medical School Medical Psychiatry Service and Mind-Body Medical Institute

The purpose of this review is to examine the interaction of the limbic system and the cellular immune system from the perspective of evolutionary biology. While the limbic system exerts a level of control over the stress response systems, the cellular immune system spearheaded by the monocyte-macrophage is responsible for the acute phase response to *** potential role of the macrophage in certain neuropsychiatric and psychosomatic disorders,including dementia,delirium, schizophrenia, depression and autoimmune disease will be

关键词： limbic system as immune tissue

Different paths to sexual size dimorphism in two praying mantids, Pseudomantis albofimbriata and Hierodula majuscula

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Insect Science 2014年第2期21卷 227-233页

作者： louise E. Allen Katherine l. Barry gregory I. Holwell Department of Biological Sciences Macquarie University North Ryde NSW 2109 Australia School of Biological Sciences The University of Auckland Auckland New Zealand

Sexual size dimorphism （SSD） is widespread among diverse animal taxa and has attracted the attention of evolutionary biologists for over a century. SSD is likely to be adaptive and the result of divergent selection on different size optima for males and females, given their different roles in reproduction. The developmental trajectory leading to SSD may help us to understand how selection acts on male and female size. Here, we describe the growth and development of two Australian praying mantids, Pseudomantis albofimbriata and Hierodula majuscula including the number of moults, time to adulthood, size at each moult, and the degree of SSD. While both species exhibit the common pattern of female-biased SSD, the number of moults required for individuals to reach adulthood differed between males and females and between species. Despite their larger adult size, P. albofimbriata females require fewer moults and less time than males to reach adulthood, but are significantly larger than males from the second instar onwards. In contrast, H. majuscula males reached adulthood in fewer moults, and less time than females, however males and females did not differ in size until females went through their final moult into adulthood. H. majuscula also required more time and more moults to reach adulthood than 17. albofimbriata. We discuss these different developmental pathways in light of the existing knowledge of reproductive biology for each species. We also suggest that these differences may relate to the different phenologies that occur in strongly seasonal temperate environments compared with those in the tropics. This study provides evidence that SSD can result from two different patterns of growth and development in closely related species.

关键词： developmental trajectories Mantodea sexual size dimorphism