全文获取类型
收费全文 | 96篇 |
免费 | 3篇 |
专业分类
安全科学 | 21篇 |
废物处理 | 1篇 |
环保管理 | 16篇 |
综合类 | 13篇 |
基础理论 | 25篇 |
污染及防治 | 13篇 |
评价与监测 | 2篇 |
社会与环境 | 4篇 |
灾害及防治 | 4篇 |
出版年
2023年 | 3篇 |
2022年 | 2篇 |
2021年 | 8篇 |
2020年 | 3篇 |
2019年 | 5篇 |
2018年 | 1篇 |
2017年 | 4篇 |
2016年 | 3篇 |
2015年 | 14篇 |
2014年 | 8篇 |
2013年 | 13篇 |
2012年 | 4篇 |
2011年 | 3篇 |
2010年 | 5篇 |
2009年 | 2篇 |
2008年 | 2篇 |
2007年 | 6篇 |
2006年 | 3篇 |
2005年 | 1篇 |
2004年 | 2篇 |
2003年 | 2篇 |
2002年 | 1篇 |
2001年 | 1篇 |
2000年 | 2篇 |
1982年 | 1篇 |
排序方式: 共有99条查询结果,搜索用时 15 毫秒
81.
de Vasconcelos Vera Mônica de Morais Elís Regina Costa Faustino Samantha Joyce Bezerra Hernandez Maria Carolina Ramirez Gaudêncio Hiara Ruth da Silva Câmara de Melo Rafael Rodolfo Bessa Junior Ambrósio Paula 《Environmental science and pollution research international》2021,28(3):2600-2607
Environmental Science and Pollution Research - Aquaculture is an activity with economic and social importance since it generates food, employment, and income. However, like other human activities,... 相似文献
82.
Mesozooplankton provide oxic and anoxic microhabitats for associated bacteria, whose carbon substrate usage activities complement those of the ambient bacteria. The metabolic profiles of bacterial communities associated with the calanoid copepod Acartia tonsa under aerobic and anaerobic conditions were examined in comparison with phytoplankton-associated bacteria. Carbon substrate usage by phytoplankton-associated bacteria was significantly different than that of copepod-associated bacteria in both aerobic and anaerobic conditions. Substrate utilization by copepod-associated bacteria was more dependent upon oxygen condition than whether the bacteria were located on the copepod exoskeleton or within the gut. Results suggest that gut bacteria were responsible for a large portion of anaerobic substrate usage by copepod-associated bacteria. The metabolic profiles of bacteria associated with six common zooplankton groups and free-living bacteria collected in July 2012 from the York River estuary, Virginia, (37°14′50.36″N, 76°29′58.03W) were also compared, and there were significant differences in their substrate utilization patterns between aerobic and anaerobic incubations, and among the different zooplankton groups. Through trophic interactions, phytoplankton-associated or free-living bacteria may be introduced to the anoxic zooplankton gut and its associated bacterial community. Inclusion of these anaerobic microenvironments and their microbial inhabitants increased the total number of substrates used by 57 % over what was used by aerobic phytoplankton-associated bacteria alone, and by 50 % over what was used by aerobic free-living bacteria in the York River. Therefore, the presence of zooplankton-associated microhabitats and their bacteria expanded the functionality of aquatic microbial communities and led to a more comprehensive substrate usage. 相似文献
83.
84.
Graham W. Prescott William J. Sutherland Daniel Aguirre Matthew Baird Vicky Bowman Jake Brunner Grant M. Connette Martin Cosier David Dapice Jose Don T. De Alban Alex Diment Julia Fogerite Jefferson Fox Win Hlaing Saw Htun Jack Hurd Katherine LaJeunesse Connette Felicia Lasmana Cheng Ling Lim Antony Lynam Aye Chan Maung Benjamin McCarron John F. McCarthy William J. McShea Frank Momberg Myat Su Mon Than Myint Robert Oberndorf Thaung Naing Oo Jacob Phelps Madhu Rao Dietrich Schmidt‐Vogt Hugh Speechly Oliver Springate‐Baginski Robert Steinmetz Kirk Talbott Maung Maung Than Tint Lwin Thaung Salai Cung Lian Thawng Kyaw Min Thein Shwe Thein Robert Tizard Tony Whitten Guy Williams Trevor Wilson Kevin Woods Alan D. Ziegler Michal Zrust Edward L. Webb 《Conservation biology》2017,31(6):1257-1270
Political and economic transitions have had substantial impacts on forest conservation. Where transitions are underway or anticipated, historical precedent and methods for systematically assessing future trends should be used to anticipate likely threats to forest conservation and design appropriate and prescient policy measures to counteract them. Myanmar is transitioning from an authoritarian, centralized state with a highly regulated economy to a more decentralized and economically liberal democracy and is working to end a long‐running civil war. With these transitions in mind, we used a horizon‐scanning approach to assess the 40 emerging issues most affecting Myanmar's forests, including internal conflict, land‐tenure insecurity, large‐scale agricultural development, demise of state timber enterprises, shortfalls in government revenue and capacity, and opening of new deforestation frontiers with new roads, mines, and hydroelectric dams. Averting these threats will require, for example, overhauling governance models, building capacity, improving infrastructure‐ and energy‐project planning, and reforming land‐tenure and environmental‐protection laws. Although challenges to conservation in Myanmar are daunting, the political transition offers an opportunity for conservationists and researchers to help shape a future that enhances Myanmar's social, economic, and environmental potential while learning and applying lessons from other countries. Our approach and results are relevant to other countries undergoing similar transitions. 相似文献
85.
Rachel Dodds Mark Holmes Vichukan Arunsopha Nicole Chin Trang Le Samantha Maung Mimi Shum 《Journal of Agricultural and Environmental Ethics》2014,27(3):397-416
The increasing popularity of local food consumption can be attributed to the heightened awareness of food safety concerns, carbon emissions produced from food transportation, and an understanding of how large corporations’ obtain their food supplies. Although there is increasing discussion on both the local and organic food movement independently, there is not a wide availability of literature examining the motivations and perceptions of consumers with regard to farmers’ markets. Issues such as perceptions about what type of food consumers are purchasing at markets, nor the main motivations for frequenting such establishments are discussed. Therefore the purpose of this study was to determine consumer motivations, benefits, and perceptions of farmers’ markets. Using the case study location of Toronto, Canada, this study surveyed 300 participants during the fall of 2011. Findings indicated that the main purpose for visiting famers’ markets is not solely to fulfill grocery needs. Quality of products offered and the ability to support the local community were the primary motivators to visit the markets. 相似文献
86.
Zooplankton carcasses are common within aquatic systems and potentially serve as organic-rich substrates for bacteria. We
compared the microbial decomposition of representative crustacean (copepod) and non-crustacean (rotifer) zooplankton carcasses
and monitored changes in carcass protein and lipid contents. Our results showed that carcass decomposition was mainly driven
by bacteria colonizing from the surrounding water. Carcass-associated bacteria displayed higher protease and lipase activities
than free-living bacteria. Protein content of copepod carcasses decreased by 70% within the first 8 h and shifted from larger
to smaller sized proteins, while protein loss in rotifer carcasses was insignificant. Carcass lipid content did not change
significantly over 24 h in either zooplankton type, although polar branched fatty acids increased on copepod carcasses indicating
an increase in viable microbial biomass. Our results suggest differential turnover of protein versus lipid within a zooplankton
carcass and that carcasses from different zooplankton groups would affect water column microbial processes differently. 相似文献
87.
88.
Becker MW Collins SA Metge DW Harvey RW Shapiro AM 《Journal of contaminant hydrology》2004,69(3-4):195-213
The influence of physicochemical characteristics and motility on bacterial transport in groundwater were examined in flow-through columns. Four strains of bacteria isolated from a crystalline rock groundwater system were investigated, with carboxylate-modified and amidine-modified latex microspheres and bromide as reference tracers. The bacterial isolates included a gram-positive rod (ML1), a gram-negative motile rod (ML2), a nonmotile mutant of ML2 (ML2m), and a gram-positive coccoid (ML3). Experiments were repeated at two flow velocities, in a glass column packed with glass beads, and in another packed with iron-oxyhydroxide coated glass beads. Bacteria breakthrough curves were interpreted using a transport equation that incorporates a sorption model from microscopic observation of bacterial deposition in flow-cell experiments. The model predicts that bacterial desorption rate will decrease exponentially with the amount of time the cell is attached to the solid surface. Desorption kinetics appeared to influence transport at the lower flow rate, but were not discernable at the higher flow rate. Iron-oxyhydroxide coatings had a lower-than-expected effect on bacterial breakthrough and no effect on the microsphere recovery in the column experiments. Cell wall type and shape also had minor effects on breakthrough. Motility tended to increase the adsorption rate, and decrease the desorption rate. The transport model predicts that at field scale, desorption rate kinetics may be important to the prediction of bacteria transport rates. 相似文献
89.
90.