全文获取类型
收费全文 | 2753篇 |
免费 | 326篇 |
国内免费 | 1010篇 |
专业分类
安全科学 | 397篇 |
废物处理 | 207篇 |
环保管理 | 257篇 |
综合类 | 2060篇 |
基础理论 | 505篇 |
污染及防治 | 366篇 |
评价与监测 | 240篇 |
社会与环境 | 45篇 |
灾害及防治 | 12篇 |
出版年
2024年 | 14篇 |
2023年 | 47篇 |
2022年 | 88篇 |
2021年 | 122篇 |
2020年 | 109篇 |
2019年 | 114篇 |
2018年 | 82篇 |
2017年 | 125篇 |
2016年 | 160篇 |
2015年 | 167篇 |
2014年 | 166篇 |
2013年 | 257篇 |
2012年 | 255篇 |
2011年 | 274篇 |
2010年 | 197篇 |
2009年 | 184篇 |
2008年 | 150篇 |
2007年 | 222篇 |
2006年 | 232篇 |
2005年 | 161篇 |
2004年 | 134篇 |
2003年 | 143篇 |
2002年 | 102篇 |
2001年 | 96篇 |
2000年 | 87篇 |
1999年 | 72篇 |
1998年 | 78篇 |
1997年 | 43篇 |
1996年 | 48篇 |
1995年 | 31篇 |
1994年 | 17篇 |
1993年 | 34篇 |
1992年 | 23篇 |
1991年 | 15篇 |
1990年 | 12篇 |
1989年 | 6篇 |
1988年 | 5篇 |
1987年 | 3篇 |
1986年 | 3篇 |
1982年 | 2篇 |
1977年 | 3篇 |
1975年 | 2篇 |
1974年 | 1篇 |
1973年 | 1篇 |
1971年 | 1篇 |
1970年 | 1篇 |
排序方式: 共有4089条查询结果,搜索用时 15 毫秒
461.
462.
用萃取火焰AAS法测定汽车道旁树叶中的铅含量 总被引:4,自引:0,他引:4
主要介绍了用碘化钾-甲基异丁基甲酮(KI-MIBK)萃取汽车道旁植物叶片中的微量铅,然后用原子吸收分光光度法(AAS)测定,该方法的精密度和准确度均有较满意的结果 相似文献
463.
464.
Chemical defense and evolutionary trends in biosynthetic capacity among dorid nudibranchs (Mollusca: Gastropoda: Opisthobranchia) 总被引:5,自引:0,他引:5
Summary. An evolutionary scenario incorporating recent advances in phylogenetic research begins with an opisthobranch-pulmonate common
ancestor that was herbivorous and had some diet-derived chemical defense. The Nudibranchia and their closest relatives, the
Notaspidea, form a lineage the ancestors of which had switched to feeding upon sponges and deriving protection from metabolites
contained in them. Subsequently there have been repeated shifts in food and defensive metabolites, and trends are evident
in the ability to detoxify, sequester and utilize metabolites from food, as well as to synthesize defensive compounds de novo. The Notaspidea display a minor adaptive radiation that foreshadows a more extensive one in the various lineages of nudibranchs.
This review emphasizes changes that have occurred within the Holohepatica, or dorid nudibranchs (order Doridacea). Their sister-group,
the Cladohepatica, consists of three other orders, Dendronotacea, Arminacea, and Aeolidiacea, in which there has been a shift
from sponges to Cnidaria as food. The Dendronotacea often feed upon Octocorallia, which combine spicules, chemical defense,
and stinging capsules and thereby suggest a transition from feeding on sponges. A previous diet of Octocorallia is suggested
by the defensive use of prostaglandins in the dendronotacean Tethys fimbria, which eats crustaceans. A shift to bryozoans in some Arminacea is accompanied by use of different metabolites. Dorid nudibranchs
evidently began as sponge-feeders, but some lineages have shifted to a variety of other food organisms, and others have specialized
in the kind of sponges they feed on and how they do it. There have been shifts to bryozoans (Ectoprocta) and ascidians (Chordata:
Urochordata) that track metabolites rather than the taxonomy of the food. There is a crude correlation between the genealogy
and the defensive metabolites of the sponge-feeding dorids. De novo synthesis is well documented in this order and the metabolites are appropriately positioned so as to have an adaptive effect.
The hypothesis that the capacity for de novo synthesis was acquired by gene transfer across lineages is rejected, partly on the basis of different chirality of metabolites
in the nudibranchs and their food organisms. Instead it is proposed that there has been a preadaptive phase followed by evolution
in a retrosynthetic mode, with selection favoring enzymes that enhance the yield of end products that are already present
in the food.
Received 5 February 1999; accepted 26 July 1999 相似文献
465.
Andrés González Frank C. Schroeder Athula B. Attygalle Aleš Svatoš Jerrold Meinwald Thomas Eisner 《Chemoecology》1999,9(3):105-112
Summary. Female Photuris fireflies sequester defensive steroidal pyrones (lucibufagins) from male fireflies of the genus Photinus. Lucibufagin analyses of Photuris females and Photinus ignitus males show that the lucibufagin mixtures of predator and prey differ in their composition. Analyses of whole body extracts
showed that P. ignitus males contain a mixture of eight non-glycosylated lucibufagins, composed mostly of compounds with two oxygenated positions
in the steroidal A-ring (C-3, C-5). After feeding on P. ignitus males, Photuris females contain six major lucibufagins. Three of these compounds are not present in the prey, including the novel lucibufagin
glycoside 5β,11α-dihydroxy-12-oxo-3β-O-β-D-xylopyranosylbufalin, and two other lucibufagins with a trioxygenated A-ring (C-2,
C-3, C-5). These results indicate that Photuris females transform the sequestered lucibufagins both by glycosylation and oxidation, which could affect the systemic transportability
of these compounds due to an increase in their polarity.
Received 18 February 1999; accepted 19 April 1999. 相似文献
466.
植物对酸沉降的净化缓冲作用研究综述 总被引:1,自引:0,他引:1
从植物对SO2的吸收作用、森林冠层对湿沉降的缓冲作用以及森林枯枝落叶层对酸沉降的吸收缓冲作用3个方面介绍了国内外在植物对酸沉降的净化缓冲作用方面的研究成果。 相似文献
467.
468.
469.
470.