全文获取类型
收费全文 | 624篇 |
免费 | 13篇 |
国内免费 | 11篇 |
专业分类
安全科学 | 63篇 |
废物处理 | 17篇 |
环保管理 | 150篇 |
综合类 | 129篇 |
基础理论 | 147篇 |
污染及防治 | 89篇 |
评价与监测 | 31篇 |
社会与环境 | 18篇 |
灾害及防治 | 4篇 |
出版年
2023年 | 7篇 |
2022年 | 4篇 |
2021年 | 13篇 |
2020年 | 16篇 |
2019年 | 6篇 |
2018年 | 18篇 |
2017年 | 15篇 |
2016年 | 26篇 |
2015年 | 17篇 |
2014年 | 22篇 |
2013年 | 45篇 |
2012年 | 19篇 |
2011年 | 40篇 |
2010年 | 20篇 |
2009年 | 27篇 |
2008年 | 30篇 |
2007年 | 28篇 |
2006年 | 31篇 |
2005年 | 29篇 |
2004年 | 19篇 |
2003年 | 22篇 |
2002年 | 25篇 |
2001年 | 14篇 |
2000年 | 20篇 |
1999年 | 6篇 |
1998年 | 7篇 |
1997年 | 5篇 |
1996年 | 9篇 |
1995年 | 11篇 |
1994年 | 9篇 |
1993年 | 6篇 |
1992年 | 9篇 |
1991年 | 8篇 |
1990年 | 5篇 |
1988年 | 8篇 |
1987年 | 5篇 |
1986年 | 3篇 |
1985年 | 4篇 |
1984年 | 2篇 |
1983年 | 5篇 |
1982年 | 6篇 |
1981年 | 10篇 |
1980年 | 6篇 |
1979年 | 2篇 |
1977年 | 2篇 |
1976年 | 1篇 |
1974年 | 1篇 |
1973年 | 1篇 |
1962年 | 1篇 |
1956年 | 1篇 |
排序方式: 共有648条查询结果,搜索用时 46 毫秒
601.
Mary McNally 《Journal of the American Water Resources Association》1994,30(6):963-970
ABSTRACT: Water marketing is an increasing important topic for policy makers and water managers, especially in the Western United States. Indian reserved rights (or Winters rights) differ in significant ways from water rights under most state prior appropriation systems. As Winters rights are quantified, a number of issues are emerging concerning the extent to which these water rights may be marketed, particularly to off-reservation users. This paper will review the evolution of Indian reserved water rights and discuss key issues surrounding the marketing of these rights. 相似文献
602.
Stephen O. Duke Hamed K. Abbas Mary V. Duke Hee Jae Lee Kevin C. Vaughn Tadashi Amagasa 《Journal of environmental science and health. Part. B》2013,48(3):427-434
Abstract Microbes are sources of a diverse array of phytotoxic compounds. These compounds are generally structurally different from commercial herbicides, targeting different molecular sites of action within the plant. These novel structures and sites can be excellent leads for the discovery and development of safer synthetic herbicides. Microbial phytotoxins are often more environmentally benign than synthetic herbicides. Examples of phytotoxins from fungi (AAL‐toxin, cornexistin, cyperin, and tentoxin) with novel structures and sites of action are discussed. AAL‐toxin is toxic to a wide variety of weeds at very low dose rates. AAL‐toxin and many of its analogues kill plants by inhibiting a ceramide synthase‐like enzyme, causing rapid accumulation of free sphingoid bases that disrupt membranes. Cornexistin appears to be metabolically cnverted to an inhibitor of certain aspartate amino transferase isoenzymes. Its activity can be reversed by feeding aspartate and glutamate or with tricarboxylic acid cycle intermediates. Its activity is much like that of (aminooxy)acetate. Cyperin is a diphenylether phytotoxin that inhibits protoporphyrinogen oxidase, but does not kill plants by this mechanism. It appears to have other effects on porphyrin metabolism. Tentoxin is toxic by two mechanisms. It disrupts chloroplast development by inhibiting the processing of a nuclear‐coded plastid protein, and it also inhibits photophosphorylation by acting as an energy transfer inhibitor of coupling factor 1 ATPase. Other examples of phytotoxins from microbes with promise as herbicides will be mentioned. 相似文献
603.
604.
605.
606.
607.
608.
609.
610.