全文获取类型
收费全文 | 3316篇 |
免费 | 68篇 |
国内免费 | 33篇 |
专业分类
安全科学 | 121篇 |
废物处理 | 102篇 |
环保管理 | 610篇 |
综合类 | 522篇 |
基础理论 | 869篇 |
环境理论 | 9篇 |
污染及防治 | 797篇 |
评价与监测 | 192篇 |
社会与环境 | 148篇 |
灾害及防治 | 47篇 |
出版年
2023年 | 13篇 |
2022年 | 17篇 |
2021年 | 39篇 |
2020年 | 20篇 |
2019年 | 32篇 |
2018年 | 79篇 |
2017年 | 76篇 |
2016年 | 83篇 |
2015年 | 86篇 |
2014年 | 96篇 |
2013年 | 244篇 |
2012年 | 156篇 |
2011年 | 203篇 |
2010年 | 149篇 |
2009年 | 163篇 |
2008年 | 174篇 |
2007年 | 205篇 |
2006年 | 205篇 |
2005年 | 150篇 |
2004年 | 107篇 |
2003年 | 102篇 |
2002年 | 116篇 |
2001年 | 65篇 |
2000年 | 59篇 |
1999年 | 49篇 |
1998年 | 50篇 |
1997年 | 60篇 |
1996年 | 47篇 |
1995年 | 55篇 |
1994年 | 49篇 |
1993年 | 29篇 |
1992年 | 31篇 |
1991年 | 23篇 |
1990年 | 23篇 |
1989年 | 11篇 |
1988年 | 14篇 |
1987年 | 14篇 |
1986年 | 19篇 |
1985年 | 17篇 |
1984年 | 19篇 |
1983年 | 21篇 |
1982年 | 17篇 |
1981年 | 16篇 |
1980年 | 18篇 |
1979年 | 20篇 |
1978年 | 13篇 |
1977年 | 10篇 |
1967年 | 9篇 |
1965年 | 11篇 |
1957年 | 10篇 |
排序方式: 共有3417条查询结果,搜索用时 234 毫秒
751.
Acetylcholinesterase (AChE) gel electrophoresis was performed on samples of amniotic fluid and extraembryonic coelomic fluid obtained by high resolution transvaginal ultrasound-guided amniocentesis from 38 women between 8 and 12 weeks of pregnancy. AChE was positive in 33 per cent (12/36) of the amniotic fluid samples; the percentage of positive results decreased as gestation advanced. AChE was positive in 32 per cent (9/28) of the extraembryonic coelomic fluid samples. In 81 per cent (21/26) of matched samples, the AChE results were identical in the two fluids. Amniotic fluid and extraembryonic coelomic fluid AChE electrophoresis cannot be used to diagnose neural tube defects prior to 12 weeks of gestation. 相似文献
752.
DM Peter Lorenz Rainer Bollmann Georg Klaus Hinkel Marco Mächler Gabriele Siegert Gudrun Stamminger Jörg Wendisch Sabine Ziemer 《黑龙江环境通报》1991,11(11):819-825
The study of the fetal platelet count and size can, according to the literature, be used for the prenatal diagnosis of the Wiskott-Aldrich syndrome (WAS). So far, no affected fetuses have been identified by this method. All pregnancies in which this method had been applied to resulted, as correctly predicted, in the birth of normal children. Here we report on a familial case of WAS where the haematological parameters failed to reveal the affected second child. Hence we assume that the platelet count and size of platelets remain normal in fetuses with WAS to the gestational age of 22 weeks and cannot be used for prenatal diagnosis. 相似文献
753.
Dr. Susanna Bunge Cordula Steglich Peter Lorenz Michael Beck Suying Xu John J. Hopwood Andreas Gal 《黑龙江环境通报》1994,14(9):777-780
Identification of iduronate-2-sulphatase (IDS) gene mutations in patients with mucopolysaccharidosis type II (MPS II, Hunter syndrome) allows fast and reliable carrier detection and prenatal diagnosis. We describe here three cases of prenatal diagnosis by direct detection of the gene mutation. In addition to two affected male fetuses from two different families, a 47,XXY fetus carrying both the normal and the mutant allele was diagnosed in a third family. The latter pregnancy was carried to term and the child is obviously not affected by MPS II. 相似文献
754.
755.
756.
757.
758.
759.
760.
Lillian Y. F. Hsu MD Sara Kaffe Edmund C. Jenkins Lita Alonso Peter A. Benn Karen David Kurt Hirschhorn Ernest Lieber Alan Shanske Lawrence R. Shapiro Edward Schutta Dorothy Warburton 《黑龙江环境通报》1992,12(7):555-573
Currently, accepted protocol which has been developed at the Prenatal Diagnosis Laboratory of New York City (PDL) requires that when a chromosome abnormality is found in one or more cells in one flask, another 20–40 cells must be examined from one or two additional flasks. Chromosome mosaicism is diagnosed only when an identical abnormality is detected in cells from two or more flasks. In a recent PDL series of 12 000 cases studied according to this protocol, we diagnosed 801 cases (6.68 per cent) of single-cell pseudomosaicism (SCPM), 126 cases (1.05 per cent) of multiple-cell pseudomosaicism (MCPM), and 24 cases (0.2 per cent) of true mosaicism. Pseudomosaicism (PM) involving a structural abnormality was a frequent finding (2/3 of SCPM and 3/5 of MCPM), with an unbalanced structural abnormality in 55 per cent of SCPM and 24 per cent of MCPM. We also reviewed all true mosaic cases (a total of 50) diagnosed in the first 22000 PDL cases. Of these 50 cases, 23 were sex chromosome mosaics and 27 had autosomal mosaicism; 48 cases had numerical abnormalities and two had structural abnormalities. Twenty-five cases of mosaicism were diagnosed in the first 20 cells from two flasks, i.e., without additional work-up, whereas the other 25 cases required extensive work-up to establish a diagnosis (12 needed additional cell counts from the initial two culture flasks; 13 required harvesting a third flask for cell analysis). Our data plus review of other available data led us to conclude that rigorous efforts to diagnose true mosaicism have little impact in many instances, and therefore are not cost-effective. On the basis of all available data, a work-up for potential mosaicism involving a sex chromosome aneuploidy or structural abnormality should have less priority than a work-up for a common viable autosomal trisomy. We recommend revised guidelines for dealing with (1) a numerical versus a structural abnormality and (2) an autosomal versus a sex chromosome numerical aneuploidy. Emphasis should be placed on autosomes known to be associated with phenotypic abnormalities. These new guidelines, which cover both flask and in situ methods, should result in more effective prenatal cytogenetic diagnosis and reduced patient anxiety. 相似文献