全文获取类型
收费全文 | 93篇 |
免费 | 1篇 |
国内免费 | 1篇 |
专业分类
安全科学 | 2篇 |
废物处理 | 5篇 |
环保管理 | 1篇 |
综合类 | 34篇 |
基础理论 | 22篇 |
污染及防治 | 14篇 |
评价与监测 | 8篇 |
社会与环境 | 9篇 |
出版年
2023年 | 2篇 |
2021年 | 2篇 |
2020年 | 2篇 |
2019年 | 2篇 |
2018年 | 1篇 |
2017年 | 2篇 |
2016年 | 3篇 |
2015年 | 2篇 |
2014年 | 4篇 |
2013年 | 2篇 |
2012年 | 7篇 |
2011年 | 3篇 |
2010年 | 3篇 |
2009年 | 2篇 |
2008年 | 7篇 |
2007年 | 6篇 |
2006年 | 3篇 |
2005年 | 2篇 |
2004年 | 2篇 |
2003年 | 2篇 |
2002年 | 2篇 |
2001年 | 3篇 |
2000年 | 3篇 |
1998年 | 1篇 |
1996年 | 3篇 |
1995年 | 2篇 |
1990年 | 1篇 |
1987年 | 2篇 |
1986年 | 1篇 |
1979年 | 1篇 |
1974年 | 1篇 |
1972年 | 1篇 |
1965年 | 1篇 |
1964年 | 2篇 |
1961年 | 2篇 |
1960年 | 3篇 |
1959年 | 1篇 |
1957年 | 4篇 |
1956年 | 1篇 |
1943年 | 1篇 |
排序方式: 共有95条查询结果,搜索用时 15 毫秒
81.
Glenn E. Palomaki B.S. James E. Haddow George J. Knight Nicholas J. Wald Anne Kennard Jacob A. Canick Devereux N. Saller Jr Miriam G. Blitzer Lois H. Dickerman Rachel Fisher Dagmar Hansmann Manfred Hansmann David A. Luthy Anne M. Summers Philip Wyatt 《黑龙江环境通报》1995,15(8):713-723
Nine centres collaborated to examine the feasibility of a screening method for trisomy 18 that was based on assigning individual risk, using a combination of maternal age and measurements of alpha-fetoprotein (AFP), unconjugated oestriol (uE3), and human chorionic gonadotropin (hCG). Second-trimester measurements of these analytes were obtained from 94 trisomy 18 pregnancies. In the 89 pregnancies without an associated open defect, the median levels for AFP, uE3, and hCG were 0.65, 0.43 and 0.36 multiples of the unaffected population median, respectively. The strongest individual predictor of risk for trisomy 18 was uE3, followed by hCG, AFP, and maternal age, in that order. Using a method of individual risk estimation that is based on the three markers and maternal age, 60 per cent of pregnancies associated with trisomy 18 would be detected at a risk cut-off level of 1:100, with a false-positive rate of about 0.2 per cent. One in nine pregnancies identified as being at increased risk for trisomy 18 would be expected to have an affected pregnancy. This risk-based screening method is more efficient than an existing method that is based on fixed analyte cut-off levels. Even though the birth prevalence of trisomy 18 is low, prenatal screening can be justified when performed in conjunction with Down syndrome screening and when a high proportion of women offered amniocentesis have an affected fetus. 相似文献
82.
83.
84.
The measures undertaken for reducing the impact of POPs on the environment are discussed in international conventions concerned with these substances and are related to the reporting of obligations which should ensure the control of their implementation and verify the effects of these measures on the environment. An essential element of this reporting involves the data concerning the emissions and environmental impact of these substances in emission inventories. A summary of the current status of emission inventories for POPs with a special focus on atmospheric emissions under EMEP is also presented. There are considerable uncertainties of reported emission data by the individual countries and in expert evaluations regarding marine and atmospheric impacts. Harmonized instruments for emission evaluation are required and under development in the form of guidance documents for the marine environment in ‘Harmonized Quantification and Reporting Procedures for Hazardous Substances (HARP-HAZ)’ and under EMEP in the ‘Atmospheric Emission Inventory Guidebook for UNECE/LRTAP’. The problems and the reasons for uncertainties in the quantification of environmental impacts are presented using the example of lindanes (hexachlorocyclohexane, HCH), polychlorinated biphenyls (PCB), polycyclic aromatic hydrocarbons (PAH) und hexachlorobenzene (HCB). 相似文献
85.
Lukas Schärer Dagmar Knoflach Dita B. Vizoso Gunde Rieger Ursula Peintner 《Marine Biology》2007,152(5):1095-1104
The Labyrinthulomycota are a relatively poorly studied group of heterotrophic unicellular eukaryotes. They comprise three
lineages, labyrinthulids, thraustochytrids, and aplanochytrids, which are all primarily marine organisms and considered to
be important components of marine microbial communities. Recently a number of Labyrinthulomycota have been implicated as parasites
of marine (but also terrestrial) plants and marine molluscs. Here we describe a new species of thraustochytrid, Thraustochytrium caudivorum sp. nov. that we have isolated from laboratory cultures of Macrostomum lignano (Rhabditophora, Macrostomorpha), a marine free-living flatworm. In these worms T. caudivorum can cause lesions, which start at the tip of the tail plate and which can lead to the dissolution of the posterior part of
the animal. Although the worms can frequently cure these lesions and regenerate the lost parts, the lesions can also result
in the complete dissolution of the animal. We describe this thraustochytrid based on pure agar cultures and infestations in
the worm cultures. Moreover, we describe its pathological effects on the worms and its morphology using both light and electron
microscopy. In addition, we report a phylogenetic analysis using a partial 18S rDNA sequence that allows us to place this
new species within the thraustochytrids. Finally, we outline a protocol that allows to permanently remove the parasites from
infested worm cultures. We conclude that thraustochytrids represent a novel group of parasites of free-living flatworms.
Electronic supplementary material The online version of this article (doi:) contains supplementary material, which is available to authorized users. 相似文献
86.
87.
88.
Dagmar?Kohoutová Anna?Rube?ová Jan?Havlí?ekEmail author 《Behavioral ecology and sociobiology》2012,66(4):569-581
In contrast to other apes, humans have relatively greater amounts of armpit hair, which is thought to retain signaling molecules.
Although armpit shaving is widespread cross-culturally, its effect on body odor has been little investigated. In four experiments,
we tested the effect of shaving and the subsequent regrowth of axillary hair. Armpit odors were collected from men who regularly
shaved (group S) or who had never shaved (group N) their armpits before. The samples were subsequently rated by women for
intensity, pleasantness, and attractiveness. In Experiments I, II (group N) and III, subjects firstly shaved one armpit and then let the hair regrow over 6 or 10 weeks. In Experiments I, II (group S) and IV, subjects shaved both armpits before the sampling and subsequently shaved one armpit during the same period, leaving the
second armpit unshaved. Odors of the shaved armpits were rated more pleasant, attractive, and less intense compared to the
unshaved armpits (Experiment I (group N)). However, no significant differences found in Experiments II and III (group N) suggest the effect of shaving is relatively minor. Moreover, there were no significant differences in odor comparing
unshaved armpits with armpits after 1 week of regrowth (Experiments I, II (group N) and III) or comparing regularly shaved armpits with armpits after 1 or 3 weeks of regrowth (Experiments I, II (group S) and IV). The odor of shaved armpits was rated significantly more attractive compared to the armpits where hair
had been regrowing for 6 or 10 weeks. 相似文献
89.
90.