全文获取类型
收费全文 | 284篇 |
免费 | 0篇 |
专业分类
安全科学 | 2篇 |
废物处理 | 6篇 |
环保管理 | 8篇 |
综合类 | 125篇 |
基础理论 | 50篇 |
污染及防治 | 68篇 |
评价与监测 | 11篇 |
社会与环境 | 12篇 |
灾害及防治 | 2篇 |
出版年
2021年 | 3篇 |
2018年 | 9篇 |
2017年 | 4篇 |
2015年 | 7篇 |
2014年 | 13篇 |
2013年 | 7篇 |
2012年 | 7篇 |
2011年 | 5篇 |
2010年 | 12篇 |
2009年 | 11篇 |
2008年 | 8篇 |
2007年 | 9篇 |
2006年 | 9篇 |
2005年 | 8篇 |
2004年 | 7篇 |
2003年 | 8篇 |
2002年 | 8篇 |
1998年 | 7篇 |
1996年 | 7篇 |
1995年 | 3篇 |
1993年 | 4篇 |
1979年 | 2篇 |
1971年 | 2篇 |
1969年 | 2篇 |
1966年 | 3篇 |
1965年 | 5篇 |
1964年 | 2篇 |
1963年 | 7篇 |
1962年 | 4篇 |
1961年 | 3篇 |
1960年 | 2篇 |
1959年 | 5篇 |
1958年 | 5篇 |
1957年 | 3篇 |
1956年 | 10篇 |
1955年 | 7篇 |
1954年 | 3篇 |
1953年 | 3篇 |
1952年 | 2篇 |
1950年 | 2篇 |
1949年 | 2篇 |
1947年 | 2篇 |
1942年 | 2篇 |
1940年 | 2篇 |
1939年 | 4篇 |
1934年 | 3篇 |
1933年 | 2篇 |
1929年 | 2篇 |
1925年 | 2篇 |
1918年 | 2篇 |
排序方式: 共有284条查询结果,搜索用时 31 毫秒
151.
Georg Wanior Rainer Stempel Thomas Rosenberger Dieter Baumgarten Thomas Schmid Walter Hempe 《Environmental Sciences Europe》1996,8(6):335-341
Various analyses and evaluative procedures are used to provide evidence of success using remediation procedures. Because of the lack of standardized procedures for soil assessment, general practice has unfortunately propagated the use of DIN standards for determining the level of similar parameters in water as well as for other heterogeneous matrices (e.g. in soil). A precise auditing of quality, however, has not been possible with this method, this procedure has even put the success of such a remediation into question. This article describes the problems of determining mineral hydrocarbon concentrations on soil as well as portraying the remediation of oil damages which has occurred on a site of a former waste oil redestillation facility [1, 2]. This procedure has been proved in practice and serves as a model because an adequately defined, standardized method (DIN standard) is lacking. 相似文献
152.
Georg Melchers 《Die Naturwissenschaften》1977,64(4):184-194
Advances in somatic genetics for some years with higher plants as well have made it possible to complement conventional plant breeding by the acceleration of breeding through recombination of growing plants directly out of the products of meiosis (e.g. “anther culture”); the application of haploid cells for mutation and selection; somatic hybridization by fusion of protoplasts, transfer of organelles or isolated genetic material. 相似文献
153.
Phylogeny of the order Zoantharia (Anthozoa,Hexacorallia) based on the mitochondrial ribosomal genes
F.?SinnigerEmail author J.?I.?Montoya-Burgos P.?Chevaldonné J.?Pawlowski 《Marine Biology》2005,147(5):1121-1128
Zoantharia (or Zoanthidea) is the third largest order of Hexacorallia, characterised by two rows of tentacles, one siphonoglyph
and a colonial way of life. Current systematics of Zoantharia is based exclusively on morphology and follows the traditional
division of the group into the two suborders Brachycnemina and Macrocnemina, each comprising several poorly defined genera
and species. To resolve the phylogenetic relationships among Zoantharia, we have analysed the sequences of mitochondrial 16S
and 12S rRNA genes obtained from 24 specimens, representing two suborders and eight genera. In view of our data, Brachycnemina
appears as a monophyletic group diverging within the paraphyletic Macrocnemina. The macrocnemic genus Epizoanthus branches as the sister group to all other Zoantharia that are sampled. All examined genera are monophyletic, except Parazoanthus, which comprises several independently branching clades and individual sequences. Among Parazoanthus, some groups of species can be defined by particular insertion/deletion patterns in the DNA sequences. All these clades show
specificity to a particular type of substrate such as sponges or hydrozoans. Substrate specificity is also observed in zoantharians
living on gorgonians or anthipatharians, as in the genus Savalia (Gerardia). If confirmed by further studies, the substrate specificity could be used as reliable character for taxonomic identification
of some Macrocnemina. 相似文献
154.
155.
156.
157.
158.
159.
Markus Metz Georg M. Klump Thomas W. P. Friedl 《Behavioral ecology and sociobiology》2007,61(9):1369-1381
The red bishop (Euplectes orix) is a highly polygynous and colonial weaverbird. Males construct several nests within their territories to which they try
to attract females, and females are solely responsible for incubation and raising offspring. In this paper, we describe the
characteristics of the red bishop’s mating system as a biological market and investigate the role of nests built by males
as a traded commodity in a mating market. As timing of breeding in red bishops in arid and semi-arid zones depends on rainfall
patterns which are often unpredictable, there are temporal changes in demand for and supply of nests within a breeding season,
with breeding activities of males and females being highly synchronised. We found that males increased their nest-building
speed with increased female breeding activity independently of rainfall, indicating that supply follows demand in this mating
market. The supply of nests was always larger than the demand for nests. Construction costs for nests increased with demand
for nests as indicated by shorter nest-building duration and shorter building delays between two consecutively built nests
at times of high breeding activity. Males as a trading class are chosen according to the age of their nests offered, with
young nests having a higher probability of being accepted by females. Furthermore, female choosiness with regard to nest age
decreased when their own market value decreased, as predicted by biological market theory. The temporal changes of breeding
activity together with the female preference for young and fresh nests require that males quickly adjust nest-building activity
to varying female demand for new nests. However, males with a better adjustment of building speed to female breeding activity
did not gain higher mating success. 相似文献
160.
Georg Karlaganis Rachel Liechti Sirasak Teparkum Pavadee Aungkavattana Ramjitti Indaraprasirt 《毒物与环境化学》2019,101(7-8):339-368
AbstractDue to vast research programmes of industrial countries during the last two decades, our knowledge about the intrinsic properties of nanomaterials has increased considerably. However, ‘nanoregulation’ lags behind this progress. Key elements of nanoregulation are definition/scope and safety/consumer information. Safety information along the nano life-cycle is vital for the nanoparticle producer down to the industrial downstream user (product producer). However, nanodeclaration (in the sense of a label on the product for consumers) is not yet widely spread, in different geographic regions for different reasons. This is a case study for the EU, Switzerland, Thailand, the USA, and Intergovernmental Organisations. In addition, this study investigates inter- and governmental activities and the relationship between nanodeclaration and WTO rules. Non-compliance with WTO rules is a pretext for not introducing nanodeclaration in products. It is concluded that WTO rules do not exclude nanodeclaration. 相似文献