检索结果-南通市图书馆

Late Pleistocene Climatic Changes in Central Brazil Indicated by Freshwater Sponges

International Journal of Geosciences 2014年第8期5卷 799-815页

作者： vanessa de souza machado Cecilia Volkmer-Ribeiro Roberto Iannuzzi Programa de Pos-graduacao em Geociencias Instituto de GeocienciasUniversidade Federal do Rio Grande do Sul(UFRGS)Porto AlegreBrasil Museu de Ciencias Naturais(MCN) Fundacao Zoobotanica do Rio Grande do Sul(FZB)Porto AlegreBrasil departamento de Paleontologia e Estratigrafia Instituto de GeocienciasUFRGSPorto AlegreBrasil

The Cemitério Palaeolake deposit in Catalao, Goiás State, Brazil, comprises a single, complete lacustrine sequence, dated from less than 27,500 ± 4000 yr B.P. to more than 51,780 ± 400 14C yr B.P. The unprecedented presence of spongillite and diatomite layers in this deposit was investigated using spicules of continental sponges as proxy data for environmental and climate reconstruction, which was relatively extensive for the ages examined. From the analysis of the sedimentary features and the associations of spicules preserved in the deposit, it was possible to reconstruct the evolution of the limnic system. Five developmental stages were thus identified, corresponding to the installation (lotic and erosion phase), establishment and development of the lake and its colmatation, the latter correlating to the Last Glacial Maximum (LGM). Moreover, based on the ecological requirements of the sponge species identified in the deposit, it was possible to infer the likely weather patterns related to respective phases of the lake. The presence of the sponge species Corvoheteromeyenia australis, presently recorded only from southern South America, indicated that polar incursions originating from the Antarctic were frequent during the last glacial period and might have played a notable role in what is now central Brazil. However, for a short time, drier and hotter weather conditions might have predominated, as suggested by the presence of the species Corvomeyenia thumi.

关键词： Spongillites Lacustrine Palaeoenvironment Palaeoclimate Central Brazil Late Pleistocene

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

Evolutionary fingerprint, phylogenetic and forest structure of tropical montane Atlantic cloud forests along an elevation gradient

引用

Journal of Mountain Science 2024年第4期21卷 1259-1271页

作者： Ravi Fernandes MARIANO vanessa Leite REZENde Cléber Rodrigo de souza Patrícia Vieira POMPEU Rubens Manoel dos SANTOS Carolina Njaime MENdeS Aloysio souza de MOURA Felipe Santana machado Warley Augusto Caldas CARVALHO Marco Aurélio Leite FONTES department of Forest Sciences Federal University of LavrasLavras 37200-900Brazil 2Environmental defence Association of Minas Gerais Belo Horizonte 30360-110Brazil department of Ecology and Conservation Federal University of LavrasLavras 37200-900Brazil department of Forest Sciences State University of Mato Grosso do SulAquidauana 79200-000Brazil Agência Zetta Federal University of LavrasLavras 37200-900Brazil. department of Natural Sciences Federal University of São João del-ReiSão João del-Rei 36307-352Brazil.

Environmental conditions can change markedly over geographical distances along elevation gradients,making them natural laboratories to study the processes that structure *** work aimed to assess the influences of elevation on Tropical Montane Cloud Forest plant communities in the Brazilian Atlantic Forest,a historically neglected *** evaluated the phylogenetic structure,forest structure(tree basal area and tree density)and species richness along an elevation gradient,as well as the evolutionary fingerprints of elevation-success on phylogenetic lineages from the tree *** do so,we assessed nine communities along an elevation gradient from 1210 to 2310 m *** large elevation *** relationships between elevation and phylogenetic structure,forest structure and species richness were investigated through Linear *** occurrence of evolutionary fingerprint on phylogenetic lineages was investigated by quantifying the extent of phylogenetic signal of elevation-success using a genus-level molecular *** results showed decreased species richness at higher elevations and independence between forest structure,phylogenetic structure and *** also verified that there is a phylogenetic signal associated with elevation-success by *** concluded that the elevation is associated with species richness and the occurrence of phylogenetic lineages in the tree communities evaluated in Mantiqueira *** the other hand,elevation is not associated with forest structure or phylogenetic ***,closely related taxa tend to have their higher ecological success in similar ***,we highlight the fragility of the tropical montane cloud forests in the Mantiqueira Range in face of environmental changes(*** warming)due to the occurrence of exclusive phylogenetic lineages evolutionarily adapted to environmental conditions(*** temperature)associated with each elevation range.

关键词： Atlantic Forest Cloud forest Conservation Community ecology Montane forests Phylogenetic diversity Phylogenetic signal

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

Contributions of anatomy to forensic sex estimation: focus on head and neck bones

引用

Forensic Sciences Research 2022年第1期7卷 11-23页

作者： Thamires Mello-Gentil vanessa souza-Mello department of Anatomy Rio de Janeiro State UniversityRio de JaneiroBrazil

This study sought to provide an up-to-date review of the importance of anatomy to human identification,focusing on the usefulness of anatomical knowledge about the head and neck bones and teeth to sex estimation in routine forensic anthropology methods.A detailed search of osteology applications in forensic sex estimation was conducted through the electronic databases for the 10 years prior to July *** articles and classic literature on the subject were gathered and outlined in this *** the available literature,several metric analyses showed accuracy superior to 80%in sexual *** measured from the inclination of glabellae and analysis of the external frontal bone surface through three-dimensional computer-aided design emerge as reliable cranial indexes for sex *** the mandible,the condylar and coronoid height,bigonial width,and condylion-gonion distance express significant sexual *** of the canine are the best option for sex estimation using teeth,as well as the thickness of the dentine or enamel of *** axis vertebra surpasses other neck bones for sex estimation due to its atypical shape and the presence of the odontoid *** analyses based on anatomy can provide reliable accuracy in sexual *** training and anatomical knowledge can reduce bias and interobserver differences,and the use of three-dimensional models and computed tomography images can enhance the accuracy of these methods for sex ***,every method should be validated before being applied to a different population.

关键词： Forensic sciences forensic anthropology sex estimation anatomy head neck teeth

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

Coronavirus disease 2019 severity in obesity:Metabolic dysfunctionassociated fatty liver disease in the spotlight

引用

World Journal of Gastroenterology 2021年第16期27卷 1738-1750页

作者： Isabela Macedo Lopes Vasques-Monteiro vanessa souza-Mello Anatomy Rio de Janeiro State UniversityRio de Janeiro 20551030Brazil Food Science and Technology Federal University of the State of Rio de JaneiroRio de Janeiro 22290250Brazil Laboratory of Morphometry Metabolismand Cardiovascular DiseasesBiomedical CenterInstitute of BiologyAnatomy DepartmentRio de Janeiro State UniversityRio de Janeiro 20551030Brazil

The coronavirus disease 2019(COVID-19)outbreak has drawn the scientific community's attention to pre-existing metabolic conditions that could aggravate the infection,causing extended viral shedding,prolonged hospitalization,and high death *** dysfunction-associated fatty liver disease(MAFLD)emerges as a surrogate for COVID-19 severity due to the constellation of metabolic alterations it *** review outlines the impact MAFLD exerts on COVID-19 severity in obese subjects,besides the possible mechanistic links to the poor *** data collected showed that MAFLD patients had poorer COVID-19 outcomes than non-MAFLD obese *** is generally accompanied by impaired glycemic control and systemic arterial hypertension,both of which can decompensate during the COVID-19 clinical ***,MAFLD subjects had higher plasma inflammatory marker concentrations than non-MAFLD subjects,which might be related to an intensified cytokine storm syndrome frequently associated with the need for mechanical ventilation and *** conclusion,MAFLD represents a higher risk than obesity for COVID-19 severity,resulting in poor outcomes and even progression to non-alcoholic *** should include MAFLD subjects in the high-risk group,intensify preventive measurements,and prioritize their vaccination.

关键词： Metabolic dysfunction-associated fatty liver disease Obesity COVID-19 Severity Cytokine storm syndrome

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

Dynamics in the emergence of dormant and non-dormant herbaceous species from the soil seed bank from a Brazilian dry forest

引用

Journal of Plant Ecology 2020年第3期13卷 256-265页

作者： José Djalma de souza Bruno Ayron de souza Aguiar Danielle Melo dos Santos vanessa Kelly Rodrigues de Araujo Júlia Arruda Simões Juliana Ramos de Andrade Elcida de Lima Araújo departamento de Biologia Universidade Federal Rural de PernambucoRecifePernambucoBrazil2Universidade Federal de Pernambuco-Centro Acadêmico de VitóriaPernambucoBrazil

Aims In dry tropical forests,herbaceous species may have dormancy mechanisms and form persistent and transient seed banks in the *** acquired,these mechanisms are efficient for the establishment and survival of these herbs,especially in forests with unpredictable climates,such as the ***,our objective was to verify whether the studied herbaceous species adopt the physical dormancy mechanism and how these natural barriers are overcome,to understand the temporal dynamics existing in the soil seed bank from a Brazilian dry tropical *** Seeds of five native herbaceous species from the Caatinga forests were selected and submitted to pre-germinative treatments for verifying the presence of physical *** collected soil samples in the rainy and dry seasons for four consecutive years and monitored the emergence of the selected herbaceous in the *** verified the differences in germination and seed bank emergence in the soil by generalized linear *** Findings The presence and absence of physical dormancy were observed in seeds from Caatinga herbaceous *** found intraspecific and interspecific differences in the herbaceous emergence from soil seed banks between years and climatic *** perennial herbs,consecutive lack of emergence between seasons and years was frequent,which suggests a direct relationship with the mechanism of physical dormancy and the environmental conditions necessary to overcome integument *** these species,seed dimorphism and dormancy may confer additional advantages to their ***,presenting intermediate levels of physical dormancy in an annual species may be an evolutionary adjustment to rainfall *** contrast,we found that the annual herb without dormancy is more sensitive to seasonal and interannual climate changes,as evidenced by the increase and significant reduction of its emergence in the soil seed *** differences acquired evoluti

关键词： establishment herbaceous species physical dormancy seed bank seed germination semiarid

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

Study of the roles of caspase-3 and nuclear factor kappa B in myenteric neurons in a P2X7 receptor knockout mouse model of ulcerative colitis

引用

World Journal of Gastroenterology 2023年第22期29卷 3440-3468页

作者： Henrique Inhauser Riceti Magalhães Felipe Alexandre machado Roberta Figueiroa souza Marcos Antônio Ferreira Caetano vanessa Ribeiro Figliuolo Robson Coutinho-Silva Patricia Castelucci department of Surgery School of Veterinary Medicine and Animal SciencesUniversity of São PauloSão Paulo 05508-270Brazil department of Anatomy University of São PauloSão Paulo 05508-000Brazil Biophysics Institute Carlos Chagas Filho Federal University of Rio de JaneiroRio de Janeiro 21941-902Brazil

BACKGROUND The literature indicates that the enteric nervous system is affected in inflammatory bowel diseases(IBDs)and that the P2X7 receptor triggers neuronal ***,the mechanism by which enteric neurons are lost in IBDs is *** To study the role of the caspase-3 and nuclear factor kappa B(NF-κB)pathways in myenteric neurons in a P2X7 receptor knockout(KO)mouse model of *** Forty male wild-type(WT)C57BL/6 and P2X7 receptor KO mice were euthanized 24 h or 4 d after colitis induction by 2,4,6-trinitrobenzene sulfonic acid(colitis group).Mice in the sham groups were injected with *** mice were divided into eight groups(n=5):The WT sham 24 h and 4 d groups,the WT colitis 24 h and 4 d groups,the KO sham 24 h and 4 d groups,and the KO colitis 24 h and 4 d *** disease activity index(DAI)was analyzed,the distal colon was collected for immunohistochemistry analyses,and immunofluorescence was performed to identify neurons immunoreactive(ir)for calretinin,P2X7 receptor,cleaved caspase-3,total caspase-3,phospho-NF-κB,and total NF-κ*** analyzed the number of calretinin-ir and P2X7 receptor-ir neurons per ganglion,the neuronal profile area(μm^(2)),and corrected total cell fluorescence(CTCF).RESULTS Cells double labeled for calretinin and P2X7 receptor,cleaved caspase-3,total caspase-3,phospho-NF-κB,or total NF-κB were observed in the WT colitis 24 h and 4 d *** number of calretinin-ir neurons per ganglion was decreased in the WT colitis 24 h and 4 d groups compared to the WT sham 24 h and 4 d groups,respectively(2.10±0.13 vs 3.33±0.17,Pdecreased in the WT colitis 4 d group compared to the WT sham 4 d group(104.63±2.49 vs 117.41±1.14,P<0.01).The number of

关键词： Cell death Enteric nervous system Gastroenterology Inflammatory bowel diseases P2X7 receptor Purinergic signaling

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

Beneficial effects of losartan or telmisartan on the local hepatic renin-angiotensin system to counter obesity in an experimental model

引用

World Journal of Hepatology 2019年第4期11卷 359-369页

作者： Francielle Graus-Nunes Felipe de Oliveira Santos Thatiany de souza Marinho Carolline Santos Miranda Sandra Barbosa-da-Silva vanessa souza-Mello Laboratorio de Morfometria Metabolismo e Doencas Cardiovasculares Departamento de Anatomia Instituto de Biologia Roberto Alcantara Gomes

BACKGROUND Obesity has been associated with hepatic overexpression of the renin-angiotensin system(RAS).AIM To evaluate the action of two angiotensin II(ANGII) receptor blockers(losartan or telmisartan) on the modulation of local hepatic RAS and the resulting metabolic effects in a diet-induced obesity murine *** Twenty C57 BL/6 mice were randomly divided into two nutritional groups for 10 wk: control group(C, n = 5, 10% of energy as fat) or high-fat group(HF, n = 15,50% of energy as fat). After treatment started, the HF group was randomly divided into three groups: untreated HF group(n = 5), HF treated with losartan(HFL, n = 5) and HF treated with telmisartan(HFT, n = 5). The treatments lasted for 5 wk, and the dose was 10 mg/kg body *** HF diet induced body mass gain(+28%, P demonstrated by reduced hepatic triacylglycerol levels coupled with reduced PLIN 2 expression and improved glycemic control.

关键词： Liver Telmisartan Losartan Obesity Angiotensin Ⅱ type 1 receptor C57BL/6 mouse

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

Time-dependent impact of a high-fat diet on the intestinal barrier of male mice

引用

World Journal of Methodology 2024年第1期14卷 114-123页

作者： Carolline Santos Miranda Daiana Araujo Santana-Oliveira Isabela Lopes Vasques-Monteiro Nathan Soares Dantas-Miranda Jade Sancha de Oliveira Glauser Flavia Maria Silva-Veiga vanessa souza-Mello department of Anatomy Rio de Janeiro State UniversityRio de Janeiro 20551030Brazil

BACKGROUND Excessive saturated fat intake compromises the integrity of the intestinal mucosa,leading to low-grade inflammation,impaired mucosal integrity,and increased intestinal permeability,resulting in the migration of lipopolysaccharide(LPS)to other *** To evaluate the chronic effects(at 10 and 16 wk)of a high-fat diet(HFD)(with 50%energy as fat)on the phylogenetic gut microbiota distribution and intestinal barrier structure and protection in C57BL/6 *** Forty adult male mice were divided into four nutritional groups,where the letters refer to the type of diet(control and HFD or HF)and the numbers refer to the period(in weeks)of diet administration:Control diet for 10 wk,HFD for 10 wk,control diet for 16 wk,and HFD for 16 *** sacrifice,biochemical,molecular,and stereological analyses were *** The HF groups were overweight,had gut dysbiosis,had a progressive decrease in occludin immunostaining,and had increased LPS *** progression reduced the number of goblet cells per large intestine area and Mucin2 expression in the HF16 group,consistent with a completely disarranged intestinal ultrastructure after 16 wk of HFD *** Chronic HFD intake causes overweight,gut dysbiosis,and morphological and functional alterations of the intestinal barrier after 10 or 16 ***-dependent reductions in goblet cell numerical density and mucus production have emerged as targets for countering obesity-driven intestinal damage.

关键词： High-fat diet Intestine Ultrastructure Goblet cells Gut microbiota

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

Numerical modeling of adhesion and adhesive failure during unidirectional contact between metallic surfaces

引用

Friction 2016年第3期4卷 217-227页

作者： Eleir M.BORTOLETO Erika F.PRADOS vanessa SERIACOPI Newton K.FUKUMASU Luiz G.D.B.da S.LIMA Izabel F.machado Roberto M.souza Surface Phenomena Laboratory Department of Mechanical Engineering Polytechnic School of the University of S(a)o Paulo Av.Prof.Mello Moraes 2231 S(a)o Paulo 05508-900 Brazil Federal University of ABC-UFABC Santo André 09210-170 Brazil

In this work, we developed a finite element modeling approach to study adhesion during unidirectional contact between a two-dimensional plane-strain square and a flat slab. The surfaces were metallic or ceramic, and we analyzed different pairs of materials and their adhesion intensity using a FORTRAN subroutine (DLOAD) connected to a commercial finite element code Abaqus, which provided the surface attractive forces based on the Lennard-Jones interatomic potential using Hamaker constants. We considered adhesive loads during both the approach and separation of the surfaces. During the separation step, we modeled the material transfer between surfaces due to adhesion with respect to damage initiation and propagation at the flat slab. The parameters considered in the simulations include normal load, chemical affinity, and system size, and we analyzed different conditions by comparing the interaction forces during approach and withdrawal. This work also presents: (i) a description of the evolution of energy dissipation due to adhesion hysteresis, (ii) the formation–growth–breakage process of the adhesive junctions and the material transfer between surfaces, and (iii) an adhesive wear map based on a proposed novel equation that correlates the material parameters and material loss due to adhesion. The results indicate that the chemical affinity between bodies in contact is more related to adhesion than the applied load. In addition, the ratio between the material strength and elastic modulus seems to be an important factor in reducing adhesive wear.

关键词： adhesion adhesive failure finite element model interatomic potentials Hamaker constants

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

Small-scale edaphic heterogeneity as a floristic-structural complexity driver in Seasonally Dry Tropical Forests tree communities

引用

Journal of Forestry Research 2020年第6期31卷 2347-2357页

作者： Cle´ber Rodrigo de souza Jean Daniel Morel Alisson Borges Miranda Santos Wilder Bento da Silva Vinı´cius Andrade Maia Polyanne Aparecida Coelho vanessa Leite Rezende Rubens Manoel dos Santos Forest Sciences departament Federal University of LavrasCx.P.3037Lavras 37200-000Brazil Biology department Federal University of LavrasCx.P.3037Lavras 37200-000Brazil

Our work aimed to test the hypothesis that soil microscale heterogeneity act as a community ecological driver,increasing diversity and promoting structural shifts on the Seasonally Dry Tropical Forest(SDTF)tree *** evaluated the relationship between microscale edaphic variations and floristic–structural patterns of tree communities in a SDTF fragment located in the southern end of the Brazilian Caatinga *** and soil data were obtained through 27 sample units of 400 m2(20 m 920 m),within each one we measured and identified at species level all arboreal individuals with Circumference at the Breast Height greater or equal to 10 cm,and also collected the soil *** the data we evaluated soil variation influence on the tree community structural and floristic patterns trough generalized linear *** explained the small-scale structural and floristic variations,contributing significantly to biomass,sprouting and to floristic relationships between sample *** was also observed a possible relation of the result with the Caatinga domain biogeographic history,due the presence of Sedimentary Caatinga species,which are not expected for the study *** plays an important role in driving small-scale complexity and diversity of SDTF,but we also suggest that Caatinga biogeographic events have influence on the high heterogeneity patterns.

关键词： Caatinga domain Edaphic variables Sprouting Sedimentary Caatinga

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：