检索结果-南通市图书馆

Baird’s tapir density in high elevation forests of the Talamanca region of Costa Rica

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Integrative Zoology 2012年第4期7卷 381-388页

作者： joséF.GONZÁLEZ-MAYA Jan SCHIPPER Beth POLIDORO Annelie HOEPKER Diego ZÁRRATE-charry Jerrold L.BELANT Sierra to Sea Institute ProCAT Internacional/ColombiaLas AlturasCoto BrusPuntarenasCosta Rica Instituto de Ecología Universidad Nacional Autónoma de México(IE-UNAM)Ciudad UniversitariaDFMexico Carnivore Ecology Laboratory Forest and Wildlife Research CenterMississippi State UniversityMississippiUSA Big Island Invasive Species Committee University of HawaiiHiloHawaiiUSA Old Dominion University NorfolkVirginiaUSA

Baird’s tapir(Tapirus bairdii)is currently endangered throughout its neotropical range with an expected popula--lished in Valle del Silencio within Parque Internacional La Amistad(PILA).Seventy-seven tapir pictures of 15 individuals comprising 25 capture-recapture events were analyzed using mark-recapture *** 100%minimum convex polygon of the sampled area was 5.7 km2 and the effective sampled area using half mean max-imum distances moved by tapirs was 7.16 *** estimated a tapir density of 2.93 individuals/km2 which rep-resents the highest density reported for this *** valleys can represent unique and important habitats for large mammal ***,the extent of isolation of this population,potentially constrained by steep slopes of the cordillera,remains *** genetic and movement studies are required to un-derstand meta-population dynamics and connectivity between lowland and highland areas for Baird’s tapir con-servation in Costa Rica.

关键词： camera trap capture Central America populations tapir

Policy Iteration Algorithms for Zero-Sum Stochastic Differential Games with Long-Run Average Payoff Criteria

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of the Operations Research Society of China 2014年第4期2卷 395-421页

作者： josédaniel López-Barrientos Faculty of Actuarial Sciences Universidad Ana´huacMe´xico NorteHuixquilucanMexico

This paper studies the policy iteration algorithm(PIA)for zero-sum stochastic differential games with the basic long-run average criterion,as well as with its more selective version,the so-called bias *** system is assumed to be a nondegenerate *** use Lyapunov-like stability conditions that ensure the existence and boundedness of the solution to certain Poisson *** also ensure the convergence of a sequence of such solutions,of the corresponding sequence of policies,and,ultimately,of the PIA.

关键词： Ergodic payoff criterion Zero-sum stochastic differential games Policy iteration algorithm Nondegenerate diffusions Poisson equation Schäl convergence Bias game

Effect of the Inclusion of Chestnut in the Finishing Diet on Volatile Compounds of Dry-Cured Ham from Celta Pig Breed

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Integrative Agriculture 2013年第11期12卷 2002-2012页

作者： josé M Lorenzo Javier Carballo daniel Franco Centro Tecnológico de la Carne de Galicia Rúa Galicia No 4Parque Tecnológico de GaliciaSan Cibrán das Vias rea de Tecnología de los Alimentos Facultad de Ciencias de OurenseUniversidad de Vigo

The effect of the inclusion of chestnut in pigs ifnishing diet on volatile compounds of dry-cured Celta ham was studied. Twelve hams of each type （from three different pigs ifnishing diets：concentrate （CO）, mixed （MI） and chestnut （CH）） were used. Volatiles were extracted using a purge-and-trap method and analyzed by gas chromatography/mass spectrometry （GC/MS）. Thirty-nine volatile compounds were identified in dry-cured Celta ham samples. Most abundant volatiles in ham samples were aldehydes, which represented respectively, 53% （CO）, 51% （MI） and 46% （CH） of the total volatile composition. With the exception of 2-butenal, 2-methyl, all aldehydes were affected by feeding system. On the other hand, hydrocarbons n-alkanes were the second major group in the volatile proifle of dry-cured Celta hams and represented 28.9, 35.7 and 32.4%of the total volatile composition for CO, MI and CH groups, respectively. Ham samples from chestnut group showed a higher content of alcohols and this result could be related with the inclusion of chestnut in the ifnishing diet of pigs. Principal component analysis showed a good separation among groups. The discriminant analysis selected eight variables （butanoic acid, hexanal, octanal, nonenal （E）, decenal （E）, tetradecane, decane trimethyl and pyridine 2-methyl） and calculated two discriminating functions to predict if chestnut has been included in the ifnishing diet. Thus, it was possible to discriminate between groups fed with ifnishing diets containing chestnuts in their composition （mixed and chestnut group）.

关键词： dry-cured ham chestnut volatile compound finishing diet discriminant analysis

alcohol drinking and mammary cancer: pathogenesis and potential dietary preventive alternatives

在线全文

学校读者我要写书评

暂无评论

World Journal of Clinical Oncology 2014年第4期5卷 713-729页

作者： Gerardo daniel Castro josé A Castro Centro de Investigaciones Toxicológicas CITEDEF B1603ALO Villa Martelli province of Buenos Aires Argentina Instituto de Investigación e Ingeniería Ambiental Universidad Nacional de General San Martín B1650ANQ San Martín province of Buenos Aires Argentina

Alcohol consumption is associated with an increased risk of breast cancer, increasing linearly even with a moderate consumption and irrespectively of the type of alcoholic beverage. It shows no dependency from other risk factors like menopausal status, oral contraceptives, hormone replacement therapy, or genetic history of breast cancer. The precise mechanism for the effect of drinking alcohol in mammary cancer promotion is still far from being established. Studies by our laboratory suggest that acetaldehyde produced in situ and accumulated in mammary tissue because of poor detoxicating mechanisms might play a role in mutational and promotional events. Additional studies indicated the production of reactive oxygen species accompanied of decreases in vitamin E and GSH contents and of glutathione transferase activity. The resulting oxidative stress might also play a relevant role in several stages of the carcinogenic process. There are reported in literature studies showing that plasmatic levels ofestrogens significantly increased after alcohol drinking and that the breast cancer risk is higher in receptor ERpositive individuals. Estrogens are known that they may produce breast cancer by actions on ER and also as chemical carcinogens, as a consequence of their oxidation leading to reactive metabolites. In this review we introduce our working hypothesis integrating the acetaldehyde and the oxidative stress effects with those involving increased estrogen levels. We also analyze potential preventive actions that might be accessible. There remains the fact that alcohol drinking is just one of the avoidable causes of breast cancer and that, at present, the suggested acceptable dose for prevention of this risk is of one drink per day.

关键词： Alcohol Ethanol Acetaldehyde Free radicals Mammary cancer Oxidative stress Estrogens Polyphenols

Driving factors of tree biomass and soil carbon pool in xerophytic forests of northeastern Argentina

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Ecological Processes 2023年第1期12卷 916-928页

作者： Silvana María joséSione Marcelo Germán Wilson Silvia Gabriela Ledesma Emmanuel Adrián Gabioud josédaniel Oszust Leandro Javier Rosenberger Centro de Investigación Científica y de Transferencia Tecnológica a la Produc-ción(CICyTTP-CONICET) España 149(3105)DiamanteEntre RíosArgentina Facultad de Ciencias Agropecuarias(FCA-UNER) Universidad Nacional de Entre RíosRuta 11 Km 10.5(3101)Oro VerdeEntre RíosArgentina Instituto Nacional de Tecnología Agropecuaria(INTA) EEA ParanáRuta 11 Km 12.5(3101)Oro VerdeEntre RíosArgentina

Background The conversion of forests into agricultural lands can be a threat because the forests carbon stored could be a source of emissions. The capacity to improve the predictions on the consequences of land use change depends on the identification of factors that influence carbon pools. We investigated the key driving factors of tree biomass and soil carbon pools in xerophytic forests in northeastern Argentina. Based on analyses of forest structure variables and abiotic factors (topography and soil properties) from 18 mature forests, we evaluated carbon pools using uniand multivariate (redundancy analysis) methods. Results The total carbon pool was estimated at 102.4 ± 24.0 Mg ha−1. Soil organic carbon storage is the single largest carbon pool relative to tree biomass, representing 73.1% of total carbon. Tree canopy cover and basal area were positively correlated with biomass carbon pool (r = 0.77 and r = 0.73, p < 0.001, respectively), proving to be significant drivers of carbon storage in this compartment. Slope, soil clay content and cation-exchange capacity had a better explanation for the variability in soil carbon pools, and all showed significant positive correlations with soil carbon pools (r = 0.64, 0.60 and 0.50;p < 0.05, respectively). The vertisols showed a 27.8% higher soil carbon stock than alfisols. Conclusions The relevance of our study stems from a dearth of information on carbon pools and their drivers in xerophytic forests, and in particular, the importance of this ecosystems’ type for Argentina, because they cover 81.9% of native forest area. Basal area and tree canopy cover exert a strong effect on the carbon pool in tree biomass but not in the soil. The results suggests that there is a potentially major SOC accumulation in forests located in slightly sloping areas and soils with higher topsoil clay content, such as vertisols. This could provide an important reference for implementing forestry carbon sink projects.

关键词： Carbon pool Forest biomass Soil parameters Ecosystem services

同方期刊数据库

Genotypic Variation in Grain Quality Tralts Among Mutants of Japonica Rice Cultivar Wuyujing3

在线全文

学校读者我要写书评

暂无评论

Genotypic Variation in Grain Quality Tralts Among Mutants of...

作者： josé daniel Abacar（丹尼）南京农业大学

学位级别：硕士

高产与优质协调已成为我国稻作科学研究的一个重要课题。经由三十多年的籼改粳,江苏已成为我国重要的粳稻生产基地,其产量常年仅次于黑龙江,是南方优质粳稻的主产区。然而,外观品质差,尤其是垩白米率居高不下是本稻区稻米生产所面临的... 详细信息

高产与优质协调已成为我国稻作科学研究的一个重要课题。经由三十多年的籼改粳,江苏已成为我国重要的粳稻生产基地,其产量常年仅次于黑龙江,是南方优质粳稻的主产区。然而,外观品质差,尤其是垩白米率居高不下是本稻区稻米生产所面临的一大难题。本研究以江苏优异粳稻品种武育粳3号的112份突变体为材料,研究了产量构成及品质指标的基因型变异,旨在筛选获得品质与农艺性状均衡突变体,为稻米品质研究提供特异种质材料。测定分析了如下产量及理化性状:(ⅰ)产量及其构成因素穗数、穗粒数、千粒重和单位面积粒数;(ⅱ)外观品质指标包括粒长、粒宽、粒厚、长宽比、垩白粒率和不完整米率;(ⅲ)碾磨品质指标包括糙米率、精米率和碾磨度;(ⅳ)营养品质指标包括直链淀粉、总淀粉及蛋白含量。主要结论如下:(1)在产量结构上,112份突变体产量的变异范围为2.15-12.49t/ha,均值为6.4t/ha。穗数、穗粒数和千粒重的变异范围分别为251.32-712.89、27.52-152.2和17.08 mg-25.93 mg,均值分别为339.23、84.88和22.42 mg。单位面积粒数的差异是其产量变异的主要来源,贡献率为94.7%。(2)在品质性状上,112份突变体垩白粒率和不完整米率的变异范围为.67%-73.33%和10.64%,均值为15.7%和3%-38.02%。粒长、粒宽、粒厚及长宽比的变异范围分别为 4.26 mm-5.17 mm、2.31 mm-3.07 mm、1.86 mm-2.18 mm 和 1.48-2.03,均值分别为4.84 mm、2.8 mm、2.03 mm和1.73。糙米率、精米率和碾磨度变异范围分别为 79.16%-85.24%、65.29%-72.9%和 13.91%-19.42%,均值分别为83.71%、71.04%和15.36%。直链淀粉、总淀粉和蛋白含量的变异范围为12.44%-19.93%、73.23%-81.59%和 4.75%-7.53%,均值为 16.92%,76.99%和 6.15%。(3)相关分析结果表明,垩白粒率与精米率呈显著负相关,而与碾磨度呈显著正相关。糙米率和精米率与碾磨度呈显著负相关。总淀粉和蛋白含量与精米率呈显著正相关,而与碾磨度呈负相关;但直链淀粉含量以其他品质性状的相关不显著。(4)按照低垩白粒率、低直链淀粉及蛋白含量适中等优质粳稻的要求,从中选择出 D12W031、D12W202、D12W060、D12W091 和 D12W177 等 25 份突变体作为稻米品质研究的特异种质材料。

关键词：粳稻突变体外观品质碾磨品质蒸煮食味品质各指标间的相关性

The Gondwana Orogeny in northern North Patagonian Massif:Evidences from the Caita Có granite, La Se?a and Pangaré mylonites,Argentina

同方学位论文库评论

在线全文

同方学位论文库

学校读者我要写书评

暂无评论

Geoscience Frontiers 2016年第4期7卷 621-638页

作者： daniel A.Gregori Bernhardt Saini-Eidukat Leonardo Benedini Leonardo Strazzere Mercedes Barros josé Kostadinoff Cátedra de Geología Argentina Departamento de Geología Universidad Nacional del Sur and INGEOSUR Department of Geosciences North Dakota State University Cátedra de Campos Gravitacionales Departamento de Física Universidad Nacional del Sur

Structural analyses in the northern part of the North Patagonia Massif, in the foliated Caita Co granite and in La Sefia and Pangare mylonites, indicate that the pluton was intruded as a sheet-like body into an opening pull-apart structure during the Gondwana Orogeny. Geochronological studies in the massif indicate a first, lower to middle Permian stage of regional deformation, related to movements during indentation tectonics, with emplacement of foliated granites in the western and central areas of the North Patagonian Massif. Between the upper Permian and lower Triassic, evidence indicates emplacement of undeformed granitic bodies in the central part of the North Patagonian Massif. A second pulse of deformation between the middle and upper Triassic is related to the emplacement of the Caita CO granite, the development of mylonitic belts, and the opening of the Los Menucos Basin. During this pulse of deformation, compression direction was from the eastern quadrant.

关键词： Gondwana Orogeny Northern Patagonia Foliated granite Mylonites Argentina

Special Issue on 15th Brazilian Polymer Conference:Biopolymers,Eco-Friendly and Biodegradable Polymers and Other Topics Related to Polymeric Materials Derived from Renewable Materials

在线全文

学校读者我要写书评

暂无评论

Journal of Renewable Materials 2021年第4期9卷 599-600页

作者： Antonio Aprigio da Silva Curvelo Antonio josé Felix Carvalho daniel Pasquini São Carlos Institute of Chemistry University of São PauloSão Carlos13566-590-SPBrazil São Carlos School of Engineering University of São PauloSão Carlos13563-120-SPBrazil Institute of Chemistry Federal University of UberlândiaUberlândia38400-902MGBrazil

This issue of Journal of Renewable Materials is a special issue dedicated to the 15th Brazilian Polymer Conference(15th CBPol)which was held in Bento Gonçalves,Rio Grande do Sul State,Brazil,from 27 to 31 October,2019[1].CBPol is the main scientific forum in the field of polymer science and technology in *** conference has been held biannually since 1991 and in this event had almost 900 participants mainly from Brazil,but also from Argentina,Chile,Peru,USA,Canada,Belgium,France,Great Britain,Portugal and Spain,with 60%students and 40%professionals.A total of 1,100 papers from 2725 authors were presented,from which 25%(280 papers)was in the field of Biomaterials showing the importance of these materials which are in general based on renewable *** 280 works were developed mainly by researchers from Brazilian institutions(universities and research institutes),mainly from the south and southeast regions of the *** subject of more than 70%of the works was dedicated on vegetal raw materials,medicinal applications,packaging and composite materials.

关键词： materials showing annually

A perspective on causality assessment in epigenetic research on neurodegenerative disorders

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 2023年第2期18卷 331-332页

作者： Philippos Koulousakis Assia Tiane Niels Hellings jos Prickaerts daniel van den Hove Tim Vanmierlo Department of Psychiatry and Neuropsychology School for Mental Health and NeuroscienceMaastricht UniversityMaastrichtThe Netherlands Department of Neuroscience Biomedical Research InstituteFaculty of Medicine and Life SciencesHasselt UniversityHasseltBelgium University MS Center(UMSC)Hasselt-Pelt HasseltBelgium Department of Immunology and Infection Biomedical Research InstituteFaculty of Medicine and Life SciencesHasselt UniversityHasseltBelgium Department of Psychiatry Psychosomatics and PsychotherapyUniversity of WuerzburgWuerzburgGermany

Epigenetics refers to herita ble and reversible processes regulating gene expression that do not involve a change to the DNA *** modifications include DNA modifications(*** methylation a nd hydroxymethyl at ion),histo... 详细信息

关键词： degenerative sequence modification