检索结果-南通市图书馆

Can small-scale altitudinal gradients predict spatial and temporal patterns in tropical forests?

Journal of Forestry Research 2021年第5期32卷 1854-1865页

作者： Mariana Caroline Moreira Morelli Cléber Rodrigo de Souza Jean Daniel Morel Vinícius andrade Maia Alisson Borges Miranda santos Kaline Fernandes Miranda Rubens Manoel dos santos Forest Sciences Department Federal University of LavrasCampus UniversitárioCx.P.3037LavrasMGCEP 37200-000Brazil Department of Biology Federal University of LavrasCampus UniversitárioLavrasMGCEP 37200-000Brazil

In tropical montane forests,compositional and structural changes are commonly driven by broad-scale altitudinal ***,given the lack of knowledge on small-scale vegetation changes and temporal dynamics,we address the effects of small-scale variations in soil and altitude on tree community structure,temporal dynamics and phylogenetic diversity in a semi-deciduous tropical forest of the Atlantic Forest Domain,southeastern *** 2010 and 2015 we sampled thirty plots of 400 m^(2),set up along an altitudinal gradient between 1000 and 1500 m a.s.I..In each plot,we collected soil samples for chemical and textural *** fitted linear models to test the effects of altitude and soil on community dynamics and phylogenetic *** and soil explained the spatial variation in number of individuals and phylogenetic diversity *** lower to higher altitudes,we found decreasing fertility,increasing tree density and decreasing phylogenetic *** significantly influenced the increases in total biomass(from 240.9 to 255.4 t ha^(-1))and individual biomass(from 0.15 to 0.17 t)recorded in the *** while community temporal dynamics had rates of 1.96%for mortality,1.02%for recruitment,1.61%for biomass loss and 2.81%for biomass gain,none of them were explained by altitude or *** species substitution averaged0.1 in the ***,these results suggest that the small-scale variations in altitude and soil likely determine the conditions and resources that drive community assembly and structure,which are expressed by spatial variations along the altitudinal *** the same time,temporal patterns were not influenced by altitude-related environmental variation,resulting in a similar dynamic behaviour across the gradient,suggesting that broad-scale factors may play a more important role than local ones.

关键词： Fine-scale Semideciduous forests Montane forests Dynamic patterns

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

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

Analysis of 12 variants in the development of gastric and colorectal cancers

引用

World Journal of Gastroenterology 2017年第48期23卷 8533-8543页

作者： Giovanna C Cavalcante Marcos AT Amador Andre M Ribeiro dos santos Darlen C Carvalho Roberta B andrade Esdras EB Pereira Marianne R Fernandes Danielle F Costa Ney PC santos Paulo P Assumpcao Andrea Ribeiro dos santos Sidney santos Laboratório de Genética Humana e Médica Universidade Federal do Pará Núcleo de Pesquisas em Oncologia Universidade Federal do Pará

AIM To evaluate the relation between 12 polymorphisms and the development of gastric cancer(GC) and colorectal cancer(CRC).METHODS In this study,we included 125 individuals with GC diagnosis,66 individuals with CRC diagnosis and 475 cancer-free individuals. All participants resided in the North region of Brazil and authorized the use of their samples. The 12 polymorphisms(in CASP8,CYP2 E1,CYP19 A1,IL1 A,IL4,MDM2,NFKB1,PAR1,TP53,TYMS,UGT1 A1 and XRCC1 genes) were genotyped in a single PCR for each individual,followed by fragment analysis. To avoid misinterpretation due to population substructure,we applied a previously developed set of 61 ancestryinformative markers that can also be genotyped by multiplex PCR. The statistical analyses were performed in Structure v.2.3.4,R environment and SPSS *** After statistical analyses with the control of confounding factors,such as genetic ancestry,three markers(rs79071878 in IL4,rs3730485 in MDM2 and rs28362491 in NFKB1) were positively associated with the development of GC. One of these markers(rs28362491) and the marker in the UGT1 A1 gene(rs8175347) were positively associated with the development of CRC. Therefore,we investigated whether the joint presence of the deleterious alleles of each marker could affect the development of cancer and we obtained positive results in all analyses. Carriers of the combination of alleles RP1 + DEL(rs79071878 and rs28361491,respectively) are at 10-times greater risk of developing GC than carriers of other combinations. Similarly,carriers of the combination of DEL + RARE(rs283628 and rs8175347) are at about 12-times greater risk of developing CRC than carriers of other *** These findings are important for the comprehension of gastric and CRC development,particularly in highly admixed populations,such as the Brazilian population.

关键词： Inflammatory processes Immune response Genomic and cellular stability Gastric cancer Colorectal cancer Amazon

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

Physiological plasticity in eucalyptus clones in the vegetative stage contributes to drought tolerance

引用

林业研究:英文版 2023年第5期34卷 1549-1561页

作者： Vilma Marques Ferreira Jailma Ribeiro de andrade Claudiana Moura dos santos Sebastiao de Oliveira Maia Júnior Joao Correia de Araújo Neto Andrea Francisca da Silva santos Vicente Mota da Silva Lucas Teles Bezerra Laurício Endres Laboratório de Fisiologia Vegetal Campus de Engenharia e Ciências AgráriasUniversidade Federal de AlagoasRio LargoAL57072-900Brazil Laboratório de Ciências Ambientais e Biodiversidade Departamento de Zootecnia.Centro de Ciências AgráriasUniversidade Estadual do MaranhãoSão LuísMA65300-000Brazil Laboratório de Propagação de Plantas.Campus de Engenharia e Ciências Agrárias Universidade Federal de AlagoasRio LargoAL57072-900Brazil Laboratório de Lepidoptera Museu de ZoologiaUniversidade de São PauloIpirangaSão PauloSP04263-000Brazil

With the expansion of eucalyptus crops to areas with severe water limitations,physiological studies involving eucalyptus clones to identify those that are tolerant to water stress become *** objective of this study was to assess morphological and physiological responses by eucalyptus clones subjected to drought stress and *** experiment consisted of three eucalyptus clones:VC865,I224 and I144 and two water regimes:control and water stress followed by rehydration,with six *** water potential,gas exchange,maximum quantum efficiency of photo systemⅡand plant height and stem diameter were evaluated under drought stress and ***6 d of rehydration,the number of leaves,leaf area and dry mass of root,leaf,stem and their total were *** clones showed intense reduction of gas exchange during the drought stress period,and only VC865 and 1144 showed rapid recovery with 3 d of *** 1224 showed greater reduction in height,stem diameter,number of leaves,water potential at midday(Ψ_(w)_(Midday)),and maximum quantum efficiency of photosystemⅡ(F_(v)/F_(m)).Clones VC865and T144 showed lower reductions inΨ_(wMidday)and F_(v)/F_(m) under ***865 had lower reductions in leaf number,leaf area and higher leaf dry mass,while clone I144 had higher height and lower reduction in root dry mass *** these clones showed higher water use efficiency with 3d of *** different phenotypic plasticities gave the clones VC865 and 1144 efficient mechanisms of acclimatization to stress and more drought tolerance,enhancing their greater capacity for recovery after stress,which allowed lower dry mass *** 1224,however,was more susceptible to drought stress,undergoing greater physiological damage with only partial recovery during rehydration.

关键词： Drought Eucalyptus species Gas exchanges Post-stress Root dry mass

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

Hydrological variability and long-term floristic-structural modifications in different habitats of a tropical semi-deciduous forest

引用

Journal of Forestry Research 2022年第3期33卷 801-811页

作者： Alisson Borges Miranda santos Vinicius andrade Maia Cléber Rodrigo de Souza Natália de Aguiar-Campos Aurélio de Jesus Rodrigues Pais Wilder Bento da Silva Nathalle Cristine Alencar Fagundes Jean Daniel Morel Rubens Manoel dos santos Department of Forestry Sciences Federal University of LavrasCampus UniversitárioC.P.3037LavrasBrazil Faculty of Environmental Engineering and Natural Resources Zambeze UniversityChimoioC.P.2400Mozambique Biological Sciences Universidade do Estado de Minas GeraisUnidade ItuiutabaAv.Antônio Carlos 6627Ituiutaba31270-901Brazil Department of Biology Federal University of LavrasUniversity campusC.P.3037Lavras37200-000Brazil

Shifts in hydrological regimes alter river flow rates and flood pulses, decrease environmental heterogeneity and the floristic-structural complexity of associated plant communities. We tested the hypothesis that drought events affect plant community composition and structure at a small-scale within a riparian fragment towards a reduction in floristic-structural complexity. The tree community was sampled in three habitats (wet, transitional and dry) and monitored in seven inventories carried out between 1991 and 2018. Hydrological variations were evaluated through annual rainfalls, river flow rates and water level data. The species richness and the detrended correspondence analysis axes were used to characterise the temporal modifications in floristic composition. Community structure was described in terms of biomass: accumulated, growth of survivors, mortality and recruitment. Generalised linear mixed models were fitted to evaluate the effects of time and environment in community. It was concluded that the climate has become drier in recent years due to declining precipitation that has affected flow rates and water levels. The floristic-structural complexity of the study fragment was maintained during the monitoring period. However, prolonged and extreme drought events displayed the potential to impact floristic-structural patterns.

关键词： Forest dynamics Climate changes Semi-deciduous seasonal forest Temporal change Functioning communities

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

Analgesic-like activity of perillyl acetate:In vivo and in silico studies

引用

Asian Pacific Journal of Tropical Biomedicine 2022年第4期12卷 156-163页

作者： Renan Braga Humberto andrade Ryldene Cruz Mayara Maia Carolina Lima Anderson santos AndréMiranda Allana Duarte Marcus Scotti Reinaldo Almeida Damião Sousa Postgraduate Program in Natural and Synthetic Bioactive Products Federal University of Paraíba58051-970João PessoaPBBrazil Research Institute for Drugs and Medicines Federal University of ParaíbaCP 5009João Pessoa58051-900PBBrazil Department of Pharmaceutical Sciences Federal University of Paraíba58051-970João PessoaPBBrazil

Objective:To evaluate the antinociceptive activity of perillyl acetate in mice and in silico ***:The vehicle,perillyl acetate(100,150 and/or 200 mg/kg,i.p.),diazepam(2 mg/kg,i.p.)or morphine(6 mg/kg,i.p.)was administered to mice,*** test,acetic acidinduced abdominal writhing,formalin-induced nociception,hot plate test,and tail-flick test were *** receptorsinvolvement in perillyl acetate antinociceptive effect was also ***:Perillyl acetate did not affect the motor coordination of ***,it reduced the number of acetic acid-induced abdominal twitches and licking times in the formalin *** was an increase of latency time in the tail-flick test of 30 and *** with naloxone reversed the antinociceptive effect of perillyl acetate(200 mg/kg).In silico analysis demonstrated that perillyl acetate could bind toμ-opioid ***:Perillyl acetate has antinociceptive effect at the spinal level in animal nociception models,without affecting the locomotor integrity and possibly throughμ-opioid *** silico studies have suggested that perillyl acetate can act as aμ-opioid receptor agonist.

关键词： Analgesic Biological products Opioid Essential oil Pain Monoterpene Perillyl acetate

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

J-A formulation: A finite element methodology for simulating superconducting devices

引用

Superconductivity 2023年第2期6卷 64-73页

作者： Gabriel dos santos Bárbara Maria Oliveira santos Felipe Sass Flávio Goulart dos Reis Martins Guilherme Gonçalves Sotelo Rubens de andrade Junior Federal Fluminense University Brazil State University of Rio de Janeiro Brazil Federal University of Rio de Janeiro Brazil

High‐temperature superconductors are a powerful technological option to be applied in the current scenario of energy *** applications include fault current limiters,power electrical cables,and electrical machines,for *** to the non‐linearities of superconductors,it is computationally costly to run real models of superconducting ***,it is of paramount importance to have a reliable and fast formulation to model superconducting *** paper proposes a new hybrid J‐A formulation to simulate superconducting *** new formulation is validated with 5 case studies,some of which are *** J‐A formulation agrees in all cases and has a smaller computation time when compared with the T‐A ***,due to the simple implementation,the proposed formulation allows the possibility of running the J and A formulations in the same order and presents itself as a potential feature to speed up and help the design of the superconducting devices.

关键词： High‐temperature superconductors Finite element method J‐A formulation

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

Magnetic bearings with double crossed loops modelled with T-A formulation and electric circuits

引用

Superconductivity 2023年第3期7卷 65-74页

作者： Bárbara Maria Oliveira santos Gabriel dos santos Flávio Goulart dos Reis Martins Felipe Sass Guilherme Gonçalves Sotelo Rubens de andrade Junior Francesco Grilli Electrical Engineering Department Rio de Janeiro State UniversityRio de Janeiro20550-900Rio de JaneiroBrazil Electrical Engineering Department Universidade Federal FluminenseNiterói24210-240Rio de JaneiroBrazil Electrical Engineering Department Universidade Federal do Rio de JaneiroRio de Janeiro21941-909Rio de JaneiroBrazil Institute for Technical Physics Karlsruhe Institute of TechnologyKarlsruhe76131Germany

The application of High‐Temperature Superconductor(HTS)coils made of coated conductors has been investigated for many years.A possible configuration for such coils is the jointless loop,also known as the ring *** double crossed loop coil(DCLC)has been successfully applied in superconducting magnetic bearings(SMBs).The design of SMBs with DCLCs requires flexible modelling to allow all parts of the device to be *** work proposes the T‐A formulation with a thin‐film approximation for modelling SMB with DCLCs in the finite element analysis framework.A 2D representation of the system is coupled with an external electric circuit to model the continuity of the lines that represent the parts of each jointless *** couple the T‐A formulation and the circuit,an average of the total electric field,with both resistive and inductive components,is applied to the *** total current computed by the circuit is applied to the T‐A *** proposed methodology was validated by comparison with levitation force experimental *** types of tests were simulated:five levitation force tests and three guidance force *** is shown that there is a limit to the behaviour of the levitation force related to the high‐loss *** this limit,the stack of DCLCs behaves as an equivalent *** this limit,a high‐loss state appears as a linear growth of the levitation *** is also shown that this high‐loss state in vertical displacement influences the lateral force.

关键词： Coated conductors Jointless loops T‐A formulation

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

Bone marrow-derived mesenchymal stem cells versus adipose-derived mesenchymal stem cells for peripheral nerve regeneration

引用

Neural Regeneration Research 2018年第1期13卷 100-104页

作者： Marcela Fernandes Sandra Gomes Valente Rodrigo Guerra Sabongi Joao Baptista Gomes dos santos Vilnei Mattioli Leite Henning Ulrich Arthur andrade Nery Maria José da Silva Fernandes Division of Hand and Upper Limb Surgery Department of Orthopedics and Traumatology Universidade Federal de Sao Paulo Sao Paulo Brazil Department of Biochemistry Institute of Chemistry Universidade de Sao Paulo Sao Paulo Brazil Division of Neurosciences Department of Neurology and Neurosurgery Universidade Federal de Sao Paulo Sao Paulo Brazil

Studies have confirmed that bone marrow-derived mesenchymal stem cells （MSCs） can be used for treatment of several nervous system diseases. However, isolation of bone marrow-derived MSCs （BMSCs） is an invasive and painful process and the yield is very low. Therefore, there is a need to search for other alterative stem cell sources. Adipose-derived MSCs （ADSCs） have phenotypic and gene expression profiles similar to those of BMSCs. The production of ADSCs is greater than that of BMSCs, and ADSCs proliferate faster than BMSCs. To compare the effects of venous grafts containing BMSCs or ADSCs on sciatic nerve injury, in this study, rats were randomly divided into four groups： sham （only sciatic nerve exposed）, Matrigel （MG; sciatic nerve injury ＋ intravenous transplantation of MG vehicle）, ADSCs （sciatic nerve injury ＋ intravenous MG containing ADSCs）, and BMSCs （sciatic nerve injury ＋ intravenous MG containing BMSCs） groups. Sciatic functional index was calculated to evaluate the function of injured sciatic nerve. Morphologic characteristics of nerves distal to the lesion were observed by toluidine blue staining. Spinal motor neurons labeled with Fluoro-Gold were quantitatively assessed. Compared with sham-operated rats, sciatic functional index was lower, the density of small-diameter fibers was significantly increased, and the number of motor neurons significantly decreased in rats with sciatic nerve injury. Neither ADSCs nor BMSCs significantly improved the sciatic nerve function of rats with sciatic nerve injury,increased fiber density, fiber diameters, axonal diameters, myelin sheath thickness, and G ratios （axonal diameter/fiber diameter ratios） in the sciatic nerve distal to the lesion site. There was no significant difference in the number of spinal motor neurons among ADSCs, BMSCs and MG groups. These results suggest that neither BMSCs nor ADSCs provide satisfactory results for peripheral nerve repair when using MG as the conductor for engraftment.

关键词： nerve regeneration mesenchymal stem cells adipose-derived mesenchmal stem cells sciatic nerve Matrigel sciatic functional index neural regeneration

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

Feasibility and safety of autologous bone marrow mononuclear cell transplantation in patients with advanced chronic liver disease

引用

World Journal of Gastroenterology 2007年第7期13卷 1067-1073页

作者： Andre Castro lyra Milena Botelho Pereira Soares luiz Flavio Maia da Silva Marcos Fraga Fortes André Goyanna Pinheiro Silva Augusto César de andrade Mota Sheilla A Oliveira Eduardo lorens Braga Wilson andrade de Carvalho Bernd Genser Ricardo Ribeiro dos santos luiz Guilherme Costa lyra Hos-pital Sao Rafael Salvador Bahia Brazil Centro de Pesquisas Goncalo Moniz Fundacao Oswaldo Cruz Salvador Bahia Brazil BGStats Consulting Graz Austria

AIM： To evaluate the safety and feasibility of bone marrow cell （BMC） transplantation in patients with chronic liver disease on the waiting list for liver transplantation. METHODS： Ten patients （eight males） with chronic liver disease were enrolled to receive infusion of autologous bone marrow-derived cells. Seven patients were classified as Child-Pugh B and three as Child-Pugh C. Baseline assessment included complete clinical and laboratory evaluation and abdominal MRI. Approximately 50 mL of bone marrow aspirate was prepared by centrifugation in a ficoll-hypaque gradient. At least of 100 millions of mononuclear-enriched BMCs were infused into the hepatic artery using the routine technique for arterial chemoembolization for liver tumors. Patients were followed up for adverse events up to 4 mo. RESULTS： The median age of the patients was 52 years （range 24-70 years）. All patients were discharged 48 h after BMC infusion. Two patients complained ofmild pain at the bone marrow needle puncture site. No other complications or specific side effects related to the procedure were observed. Bilirubin levels were lower at 1 （2.19 ± 0.9） and 4 mo （2.10 ± 1.0） after cell transplantation that baseline levels （238 ± 1.2）. Albumin levels 4 mo after BMC infusion （3.73 ± 0.5） were higher than baseline levels （3.47 ± 0.5）. International normalized ratio （INR） decreased from 1.48 （SD = 0.23） to 1.43 （SD = 0.23） one month after cell transplantation. CONCLUSION： BMC infusion into hepatic artery of patients with advanced chronic liver disease is safe and feasible. In addition, a decrease in mean serum bilirubin and INR levels and an increase in albumin levels are observed. Our data warrant further studies in order to evaluate the effect of BMC transplantation in patients with advanced chronic liver disease.

关键词： Bone marrow Cell transplantation Liverfailure Stem cell Cirrhosis

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：