全文获取类型
收费全文 | 2165篇 |
免费 | 290篇 |
国内免费 | 1398篇 |
专业分类
安全科学 | 104篇 |
废物处理 | 209篇 |
环保管理 | 205篇 |
综合类 | 1952篇 |
基础理论 | 653篇 |
污染及防治 | 618篇 |
评价与监测 | 46篇 |
社会与环境 | 57篇 |
灾害及防治 | 9篇 |
出版年
2024年 | 8篇 |
2023年 | 49篇 |
2022年 | 84篇 |
2021年 | 88篇 |
2020年 | 99篇 |
2019年 | 102篇 |
2018年 | 111篇 |
2017年 | 115篇 |
2016年 | 136篇 |
2015年 | 151篇 |
2014年 | 158篇 |
2013年 | 325篇 |
2012年 | 262篇 |
2011年 | 224篇 |
2010年 | 183篇 |
2009年 | 179篇 |
2008年 | 138篇 |
2007年 | 214篇 |
2006年 | 217篇 |
2005年 | 161篇 |
2004年 | 147篇 |
2003年 | 128篇 |
2002年 | 98篇 |
2001年 | 54篇 |
2000年 | 80篇 |
1999年 | 75篇 |
1998年 | 50篇 |
1997年 | 52篇 |
1996年 | 36篇 |
1995年 | 30篇 |
1994年 | 26篇 |
1993年 | 26篇 |
1992年 | 9篇 |
1991年 | 13篇 |
1990年 | 10篇 |
1989年 | 3篇 |
1988年 | 3篇 |
1986年 | 7篇 |
1981年 | 1篇 |
1977年 | 1篇 |
排序方式: 共有3853条查询结果,搜索用时 296 毫秒
41.
42.
44.
Two strains of bacteria were isolated from nitrile polluted soils, and identified as Corynebacterium boffmanii and Arthrobacter flavescens. Acetonitrile, propionitrile, butyronitrile and acrylonitrile were degraded by these bacteria to yield corresponding amides, carboxylic acids and ammonia. The nitrile-degrading abilities of these strains were investigated. The removal rates for the nitrile were nearly 100%, after these bacteria were grown in medium containing 10000 ppm of aceto-, propio-, or butyronitrile at 28 ℃ for 24h. When the reaction mkture consisting of 5000 ppm of above mentioned nitriles or acrylonitrile and 20g (dry cell) /L resting cells of the two strains in 0.06mol/L phosphate buffer (pH7.5) was incubated separately at 25 ℃ with moderate shaking for 15 or 45 min, the nitrile could be degraded completely. The optimum growth conditions for C.hoffmanii and A.flavescens were studied as well. 相似文献
45.
沼泽红假单胞菌H3对酸性红B2GL染料的厌氧脱色和降解作用 总被引:7,自引:0,他引:7
从印染厂污泥中分离到一株沼泽红假单胞菌(RhodopseudomonaspalustrisH3),在光照厌氧条件下该菌生长细胞可将100mg/L酸性红B2GL染料去除到30mg/L.完整细胞脱色的最适条件为pH70,温度30℃,细胞浓度20—25mg/mL(湿重).低浓度的阳离子对脱色影响不大.在通Ar气使严格厌氧和加有还原性辅酶I的条件下无细胞提取液的脱色活性最高,比活率为154×10-2mg/(mg·h).根据降解产物的分析,推断了该菌对酸性红染料的降解代谢途径. 相似文献
46.
甲氰菊酯在土壤中的降解与移动性 总被引:7,自引:0,他引:7
采用模拟试验和田间试验相结合的方法,研究了甲氰菊酯在南方菜地土壤中的降解和移动.得出了一些基本数据,为甲氰菊酯在菜地(旱地)生态中的安全使用,提出了合理的评价. 相似文献
47.
土壤中农药污染的植物—微生物联合修复 总被引:6,自引:0,他引:6
分析了受农药污染的土壤生物修复中植物所起的作用,认为选取适当的植物对帮助微生物降解农药效果更好,并探讨了影响联合修复技术的制因素,对此技术的发展和完善提出了建议。 相似文献
48.
植物根系对镉毒害的防御及其代谢 总被引:9,自引:0,他引:9
本文采用植物根系生物量、根系内活性氧清除酶活性变化和植物表观中毒症状作指标 ,研究了 Cd毒害对草坪植物的毒性作用、根系应激反应。结果表明 ,当土壤溶液中 Cd浓度达 1.5× 10 - 3mol· dm- 3时 ,植物体内活性氧代谢、生长状况将出现异常 ,甚至出现明显的表观中毒症状。 Cd对植物体内清除酶活性的毒性强度为 CAT>SOD>POD。匍匐翦股颖 (Agrostis stolonifera)根系对 Cd毒害的抵抗作用强于多年生黑麦草 (L olium perernne)。 相似文献
49.
Effect of leachate recycling and inoculation on the biochemical characteristics of municipal refuse in landfill bioreactors 总被引:2,自引:0,他引:2
Activity development of key groups of enzymes involved in municipal refuse decomposition was measured in laboratory landfill bioreactors with and without leachate recycling and inoculation for about 210 days.The results showed that the enzymes(amylase,protease,cellulase,lipase and pectinase)were present in fresh refuse but at low values and positively affected by leachate recycling and refuse inoculation.The total average of cellulase activity in digesters D3 operated with leachate recycling but no inoculation,D4 and D5 operated with leachate recyling and inoculation was much higher than that in digesters D1 and D2 without leachate recycling and inoculation by 88%-127%,117%-162%and 64%-98%.The total average of protease activity was higher in digester D4 than that in digesters D1,D2,D3and D5 by 63%,39%,24%and 24%,respectively,and the positive effect of leachate recycling and inoculation on protease activity of landfilled refuse mainly was at the first two months.The total average of amylase activity was higher in digesters D3,D4 and D5 than that in digesters D1 and D2 by 83%-132%,96%-148%and 81%-129%.During the early phase of incubation,the stimulatory effect of inoculation on lipase activity was measured,but refuse moisture was the main factor affecting lipase activity of landfilled refuse.The inoculation,initial and continuous inoculation of microorganisms existing in leachate,was the mainly stimulatory factor affecting pectinase activity of landfilled refuse. 相似文献
50.