检索结果-南通市图书馆

Sex-dependent resilience to extreme drought events: implications for climate change adaptation of a South American endangered tree species

引用

ecological Processes 2024年第2期 48-60页

作者： Sergio Piraino martín Ariel Hadad yanina Antonia Ribas-Fernández Fidel Alejandro Roig Laboratorio de Dendrocronología e Historia Ambiental (iANiGLA CONiCeT ) Facultad de Ciencias Agrarias Universidad Nacional de Cuyo Laboratorio de Dendrocronología de Zonas áridas (CiGeOBiO CONiCeT ) Gabinete de Geología Ambiental (INGEO UNSJ) Hémera Centro de Observación de la Tierra Facultad de Ciencias Universidad Mayor

Background Recent changes in climatic trends are resulting in an increased frequency and intensity of extreme events, with unknown effect on ecosystem dynamics in the near future. extreme drought episodes are recognized as disturbance factors capable of modifying forest dynamics and tree growth. Within this context, dioecious tree species may be impacted by climatic extremes, affecting male/female proportions and, consequently, reproductive processes and species persistence. Therefore, there is an urgent need for species-specific assessments of growth tolerance to extreme dry spells in dioecious tree species, to establish effective conservation strategies for these particular natural resources. Araucaria araucana(araucaria), an endangered dioecious Patagonian tree species, has recently undergone decay and mortality episodes in response to increasing dry climatic conditions. While sex-dependent tolerance to extreme drought episodes has been assessed in the species' humid distribution range, there is still a lack of information on the gender-based resilience of trees growing in the drier environments of the species' *** We reconstructed, through dendrochronological methods, the sex-dependent response of 105 araucaria individuals(55 female and 50 male trees) to five regional extreme dry spells employing a set of different indices. Resistance, recovery period, and average growth reduction of standardized tree-ring growth were examined, analysing the effect of biotic(sex, pre-drought stem tree growth) and abiotic(local climatic conditions before, during, and after extreme climatic episodes) factors on tree *** Sex influences only the species resistance to climatic disturbance, with male individuals showing lower tolerance to extreme drought events. Pre-drought radial growth rates and local meteorological conditions preceding, during, and following extreme dry spells strongly modulated araucaria radial growth resilience regardless of tree s

关键词：

来源：

同方期刊数据库博看期刊评论

在线全文

学校读者我要写书评

暂无评论

Root proliferation in native.perennial grasses of arid Patagonia,Argentina

引用

Journal of Arid Land 2014年第2期6卷 195-204页

作者： yanina A TORReS Carlos A BUSSO Oscar A MONTeNeGRO Leticia iTHURRART Hugo D GiORGeTT Gustavo RODRíGUeZ Diego BeNTiVeGNA Roberto e BReVeDAN Osvaldo A FeRNáNDeZ maría M MUJiCA Sandra S BAiONi José eNTíO maría N FiOReTTi Guillermo TUCAT Agronomy Department National University of the South and CERZOS (CONICET) e.perimental Farm eeA iNTA Patagones Ministery of Agrarian Issues Faculty of Agrarian Sciences National University of La Plata

Pappophorum vaginatum is the most abundant C4 perennial grass desirable to livestock in rangelands of northeastern Patagonia, Argentina. We hypothesized that （1） defoliation reduce net primary productivity, and root length density and weight in the native species, and （2） root net primary productivity, and root length density and weight, are greater in P. vaginatum than in the other, less desirable, native species （i.e., Aristida spegazzinfi, A. subulata and Sporobolus cryptandrus）. Plants of all species were either exposed or not to a severe defoliation twice a year during two growing seasons. Root proliferation was measured using the cylinder method. Cylindrical, iron structures, wrapped up using nylon mesh, were buried diagonally from the.periphery to the center on individual plants. These structures, initially filled with soil without any organic residue, were dug up from the soil on 25 April 2008, after two successive defoliations in mid-spring 2007. During the second growing season （2008-2009）, cylinders were destructively harvested on 4 April 2009, after one or two defoliations in mid- and/or late-spring, respectively. Roots grown into the cylinders were obtained after washing the soil manually. Defoliation during two successive years did reduce the study variables only after plants of all species were defoliated twice, which supported the first hypothesis. The greater root net primary productivity, root length den- sity and weight in P. vaginatum than in the other native species, in support of the second hypothesis, could help to explain its greater abundance in rangelands of Argentina.

关键词： Aristida species competitive ability Pappophorum vaginatum Sporobolus cryptandrus warm-season perennial grasses

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

Modelling of microbial enhanced oil recovery application using anaerobic gas-producing bacteria

引用

Petroleum Science 2014年第2期11卷 272-278页

作者： Pavel Spirov yanina ivanova Svetlana Rudyk Department of Petroleum and Chemical engineering Sultan Qaboos University Chemistry & environment Mrsk Olie og Gas A/S Kanalen 2 DK-6700 Esbjerg

Microbial enhanced oil recovery （MeOR） methods apply injection of bacteria to depleted oil reservoirs to produce oil, which had remained unrecovered after the conventional methods of production. The ability ofthermophilic anaerobic bacteria to produce gas as the main mechanism in potential MeOR in high salinities of 70-100 g/L was investigated in this study. Maximum gas production of up to 350 mL per 700 mL of salty solution was produced at a salinity of 90 g/L stably during 2-4 days of e.periment. The e.perimental results were upscaled to the Snorre Oilfield, Norway, and simulated using eCLiPSe software for 27 months. The best scenarios showed that the increase in oil recovery on average was at 21% and 17.8% respectively. This study demonstrated that anaerobic bacteria used in biogas plants could be an attractive candidate for MeOR implementation due to their ability to withstand high te.perature and salinity, and produce gas in large volumes.

关键词： Microbiological enhanced oil recovery CO2 injection eCLiPSe simulation

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

Potential Technological Use of Reserves of <i>Jatropha curcas</i>and <i>J. macrocarpa</i>Griseb. Seeds

引用

American Journal of Plant Sciences 2019年第8期10卷 1444-1456页

作者： Nancy e. de las M. Tavecchio marta S. Dardanelli yanina B. Reguera Herminda e. Reinoso Oscar A. Terenti marisa M. Garbero Hilda e. Pedranzani Departamento de Ciencias Agropecuarias Facultad de Ingeniería y Ciencias Agropecuarias Universidad Nacional de San Luis San Luis Argentina Departamento de Biología Molecular Facultad de Ciencias Exactas Físico-Químicas y Naturales Universidad Nacional de Río Cuarto Córdoba Argentina Departamento de Ciencias Naturales Facultad de Ciencias Exactas Físico-Químicas y Naturales Universidad Nacional de Río Cuarto Córdoba Argentina Laboratorio de semillas EEA INTA San Luis Argentina Departamento de Bioquímica y Ciencias Biológicas Facultad de Química Bioquímica y Farmacia Universidad Nacional de San Luis San Luis Argentina

J. curcas and J. macrocarpa are useful for restoring degraded areas and their seeds contain oils for biodiesel production. The aim of the work was to determine the reserve substances in the endosperm and the embryo of J. curcas and J. macrocarpa which is important in understanding the germination process, the establishment of these species and its industrial employment. Seeds were imbibed in distilled water for 24 h, to facilitate removal of seed coat with the aim to separate the embryo and nutritive tissues. in both species, the endosperm contained aleurone grains consisting of a crystalloid and globoid, lipids of red color and the starch was not observed. Four major fatty acids were determined in J. curcas seed: oleic, palmitic, stearic, palmitoleic and oleic fatty acid represents about 70% oil content. Oleic acid was the most abundant in J. macrocarpa seeds, while, there was not palmitoleic acid. Seed with predominantly unsaturated fatty acids is ideal for biodiesel industry. The means of the sugar content were: 14.3 μg/mg in endosperm and 104.76 μg/mg in embryo of J. curcas and 6.48 μg/mg in endosperm and 59.20 μg/mg in embryo of J. macrocarpa. The means of the protein content were: 4.2 μg/mg in endosperm and 45.02 μg/mg in embryo of J. curcas and 3.26 μg/mg in endosperm and 31.08 μg/mg in embryo of J. macrocarpa. Sugar and protein contents of Jatropha seeds were significantly higher in embryo in both species (p 0.1), which suggests early mobilization towards the embryo during imbibition period.

关键词： Fatty Acids J. curcas J. macrocarpa Proteins Seeds Sugars

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

Mesenchymal Bone marrow-derived Stem Cells Transplantation in Patients with HCV Related Liver Cirrhosis

引用

Journal of Clinical and Translational Hepatology 2014年第4期2卷 217-221页

作者： Sviatlana P. Lukashyk Vladimir M. Tsyrkunov yanina i. isaykina Oksana N. Romanova Artur T. Shymanskiy Olga V. Aleynikova Rimma i. Kravchuk Department of infection Diseases The Belarusian State Medical University Minsk Republic of Belarus Department of infection Diseases The Grodno State Medical University Grodno Republic of Belarus Cell biotechnology and cytotherapy laboratory The Republican Research and Practical Center of Pediatric Oncology and Hematology Minsk Republic of Belarus Central Scientific Research Laboratory The Grodno State Medical University Grodno Republic of Belarus

Background and Aims: To evaluate the effect of intrapar-enchymal transplantation of mesenchymal bone marrow-derived stem cells (BMSCs) in patients with hepatitis C virus (HCV)-related liver cirrhosis (LC). Methods: Mononuclear cells were isolated from patient bone marrow and were passaged several times in vitro in order to reach the required volume. Attributes of the BMSCs were evaluated by the presence of the surface markers CD105+, CD90+, and CD73+. Cells from each passage were evaluated for sterility, and they were transplanted intraparenchymally into liver tissue. Clinical and laboratory data were evaluated and morphological studies of liver biopsy were.performed prior to and 6 months after transplantation. Results: On clinical evaluation, the general state of these patients was improved at 1 month following transplantation of BMSCs. At 1 and 6 months post-transplantation, jaundice was absent in four (67%) patients. After 6 months, functional hepatic indices were improved, i.e. decrease of ALT and AST activity and bilirubin level. However, these decreases were not statistically different (P>0.05). expression of CD34 and α-SMA in liver biopsy samples were decreased at 6 months after transplanta-tion, consistent with structural improvements in mitochondria and nuclear compartments. Conclusions: intraparenchymal transplantation of autologous BMSCs improved the functional condition of the liver, stimulated reparative processes in hepatocytes, and decreased extracellular matrix protein (eMP) count in hepatic tissues of patients with LC. it was well tolerated and was not associated with any complications both during and after BMSC transplantation.

关键词： Liver cirrhosis Mesenchymal bone marrow stem cells Trans-plantation therapy

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

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

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：