全文获取类型
收费全文 | 383篇 |
免费 | 1篇 |
国内免费 | 1篇 |
专业分类
安全科学 | 1篇 |
废物处理 | 9篇 |
环保管理 | 11篇 |
综合类 | 222篇 |
基础理论 | 36篇 |
污染及防治 | 68篇 |
评价与监测 | 29篇 |
社会与环境 | 9篇 |
出版年
2017年 | 5篇 |
2016年 | 5篇 |
2014年 | 6篇 |
2013年 | 15篇 |
2012年 | 6篇 |
2011年 | 8篇 |
2010年 | 6篇 |
2009年 | 4篇 |
2008年 | 21篇 |
2007年 | 12篇 |
2006年 | 6篇 |
2005年 | 5篇 |
2004年 | 11篇 |
2003年 | 9篇 |
2002年 | 7篇 |
1997年 | 4篇 |
1994年 | 6篇 |
1993年 | 4篇 |
1992年 | 5篇 |
1991年 | 5篇 |
1990年 | 6篇 |
1989年 | 6篇 |
1988年 | 8篇 |
1987年 | 6篇 |
1985年 | 5篇 |
1984年 | 4篇 |
1979年 | 5篇 |
1978年 | 7篇 |
1977年 | 4篇 |
1976年 | 6篇 |
1969年 | 3篇 |
1968年 | 9篇 |
1967年 | 8篇 |
1966年 | 5篇 |
1965年 | 6篇 |
1964年 | 6篇 |
1963年 | 5篇 |
1961年 | 5篇 |
1958年 | 3篇 |
1957年 | 3篇 |
1956年 | 5篇 |
1954年 | 6篇 |
1952年 | 4篇 |
1943年 | 5篇 |
1934年 | 3篇 |
1924年 | 4篇 |
1919年 | 3篇 |
1918年 | 4篇 |
1917年 | 4篇 |
1913年 | 4篇 |
排序方式: 共有385条查询结果,搜索用时 93 毫秒
311.
312.
313.
314.
We report a new case of prenatal diagnosis of recessive microcephaly by ultrasound examination allowing termination of pregnancy at 25 weeks gestation. 相似文献
315.
316.
317.
An early life stage bioassay (E.L.S.-bioassay) for the determination of polychlorinated dibenzo-p-dioxins and dibenzofurans in complex matrices has been developed. The bioassay is based upon mortality, resulting from a typical toxicopathological syndrome in rainbow trout eleutheroembryos. Its reliability is demonstrated by the application to incinerator fly ash. It is concluded, that the E.L.S.-bioassay is a simple, useful and relatively inexpensive method to determine the amount of PCDDs and PCDFs in potentially contaminated environmental samples. 相似文献
318.
The metabolism of 4,4′-dichlorobiphenyl in the rat has been investigated in detail and four monohydroxy-, four dihydroxy- and two trihydroxy metabolites were detected. The structures of the metabolites - except for the trihydroxy compounds - were ascertained by GC-MS studies and by comparison with synthetic compounds. Metabolism experiments in frog resulted in the isolation and characterisation of four metabolites. The structure of the major metabolites in both the rat and the frog are consistent with epoxidation of the biphenyl nucleus followed by epoxide ring opening accompanied by a 1,2-chlorine shift (NIH-shift). The formation of one minor rat metabolite, 4-chloro-3t́-biphenylol can only be explained by reductive dechlorination. 相似文献
319.
Lafond S Paré T Dinel H Schnitzer M Chambers JR Jaouich A 《Journal of environmental science and health. Part. B》2002,37(2):173-186
Composting of agricultural and domestic wastes is used increasingly to reduce weight, volume, and odor; destroy animal and plant pathogens; and improve the quality of end-products to be used as soil amendments and growth substrates. The objective of this study was to investigate the transformation of C and N and the survival of bacterial populations and pathogenic bacteria during in-vessel composting of duck excreta enriched wood shavings. Two feedstocks, collected on different dates, were composted (C1 and C2) in an enclosed hall system equipped with an electromechanical turner. Temperature was continuously recorded, whereas moisture content and bacterial counts were determined twice a week. Data showed that, although the N content of C2 was only half of that of C1, both materials were fully biostabilized at the end of the composting period as indicated by extractable lipid ratios. In the compost with the low C/N ratio (C1), all bacterial populations were eliminated, whereas fecal streptococci, total coliforms, and gram-negative bacteria were still present in C2 at the end of the composting period. Our results emphasize that the composting of manures and other organic wastes needs to be properly managed to stabilize C and N and to eliminate or reduce bacterial populations. 相似文献
320.
2,4-Dichlorophenoxyacetic acid (2,4-D) sorption and degradation dynamics in three agricultural soils 总被引:3,自引:0,他引:3
Boivin A Amellal S Schiavon M van Genuchten MT 《Environmental pollution (Barking, Essex : 1987)》2005,138(1):92-99
The fate and transport of 2,4-dichlorophenoxyacetic acid (2,4-D) in the subsurface is affected by a complex, time-dependent interplay between sorption and mineralization processes. 2,4-D is biodegradable in soils, while adsorption/desorption is influenced by both soil organic matter content and soil pH. In order to assess the dynamic interactions between sorption and mineralization, 2,4-D mineralization experiments were carried using three different soils (clay, loam and sand) assuming different contact times. Mineralization appeared to be the main process limiting 2,4-D availability, with each soil containing its own 2,4-D decomposers. For the clay and the loamy soils, 45 and 48% of the applied dose were mineralized after 10 days. By comparison, mineralization in the sandy soil proceeded initially much slower because of longer lag times. While 2,4-D residues immediately after application were readily available (>93% was extractable), the herbicide was present in a mostly unavailable state (<2% extractable) in all three soils after incubation for 60 days. We found that the total amount of bound residue decreased between 30 and 60 incubation days. Bioaccumulation may have led to reversible immobilization, with some residues later becoming more readily available again to extraction and/or mineralization. 相似文献