全文获取类型
收费全文 | 1016篇 |
免费 | 5篇 |
国内免费 | 1篇 |
专业分类
安全科学 | 36篇 |
废物处理 | 32篇 |
环保管理 | 90篇 |
综合类 | 219篇 |
基础理论 | 265篇 |
环境理论 | 3篇 |
污染及防治 | 243篇 |
评价与监测 | 77篇 |
社会与环境 | 51篇 |
灾害及防治 | 6篇 |
出版年
2022年 | 4篇 |
2021年 | 10篇 |
2020年 | 9篇 |
2019年 | 6篇 |
2018年 | 21篇 |
2017年 | 34篇 |
2016年 | 27篇 |
2015年 | 24篇 |
2014年 | 24篇 |
2013年 | 63篇 |
2012年 | 38篇 |
2011年 | 53篇 |
2010年 | 39篇 |
2009年 | 39篇 |
2008年 | 60篇 |
2007年 | 58篇 |
2006年 | 49篇 |
2005年 | 28篇 |
2004年 | 27篇 |
2003年 | 40篇 |
2002年 | 33篇 |
2001年 | 23篇 |
2000年 | 30篇 |
1999年 | 14篇 |
1998年 | 8篇 |
1997年 | 7篇 |
1996年 | 9篇 |
1995年 | 16篇 |
1994年 | 9篇 |
1993年 | 14篇 |
1992年 | 9篇 |
1991年 | 7篇 |
1990年 | 5篇 |
1989年 | 7篇 |
1988年 | 9篇 |
1987年 | 8篇 |
1986年 | 5篇 |
1985年 | 7篇 |
1984年 | 14篇 |
1983年 | 4篇 |
1982年 | 9篇 |
1981年 | 10篇 |
1980年 | 9篇 |
1979年 | 17篇 |
1978年 | 10篇 |
1977年 | 13篇 |
1976年 | 13篇 |
1975年 | 12篇 |
1974年 | 4篇 |
1962年 | 4篇 |
排序方式: 共有1022条查询结果,搜索用时 203 毫秒
21.
22.
23.
24.
A protocol for easy storage and later expansion of lymphocyte populations is given. Compared with methods using transformed cell lines, the method has a number of advantages for repeated production of cells for the isolation of DNA in amounts sufficient for use in diagnostic DNA technology. 相似文献
25.
Finn Stener Jørgensen MD 《黑龙江环境通报》1995,15(5):419-429
The aim of the study was to describe the opinion of pregnant women who had accepted or declined an alpha-fetoprotein (AFP) test, not only on AFP screening in general, but also on whether every pregnant woman should be offered amniocentesis (AC)/chorionic villus sampling (CVS) and an ultrasound scan for fetal malformations. An additional aim was to describe pregnant women's attitudes concerning continued research in the prenatal field. The study was performed as a questionnaire study in two regions over a 1-year period from 1 October 1988 to 30 September 1989. Results are based on answers from 3331 women who had taken an AFP test and 336 women who had declined the offer of a test. A total of 79 per cent of the women thought that an AFP test, 70 per cent that an ultrasound scan for fetal malformations, and 26 per cent that AC or CVS should be offered to all pregnant women. Fifty-nine per cent of the women were positive towards continued research in the prenatal field. Women who had had an AFP test were generally much more positive towards screening and research than women who had declined, who were generally against. Women who had left school without a high school degree were on average more positive towards the screening issues than women who had this degree. In conclusion, the results obtained in this study strongly suggest that women's attitudes are very dependent on how the prenatal screening programme is already organized in their local area. 相似文献
26.
27.
Christian Klixbüll Jørgensen 《Die Naturwissenschaften》1982,69(9):420-427
The “constituents” quarks and leptons of matter (with rest-mass) are compared with the historical development of “elements” in chemistry. If unsaturated quarks induce high (and at the moment unpredictable) rest-masses above l0GeV, we have a new view of nuclei comprising (2Z + N) u-quarks and (Z +2N) d-quarks in their low-energy states, without any reference to protons and neutrons as permanent building-blocks. Recent studies of quarks and possible rishons (sub-quarks) and technicolour hadrons are reviewed, and the rôle of identity and cardinality in quantum mechanics analyzed. 相似文献
28.
29.
30.
Niels Gregersen Vibeke Winter Peter K. A. Jensen Anni Holmskov Steen Kølvraa Brage S. Andresen Ernst Christensen Peter Bross Jytte B. Lundemose Dr Markil Gregersen 《黑龙江环境通报》1995,15(1):82-86
Medium-chain acyl-CoA dehydrogenase (MCAD) deficiency is a potentially fatal inherited disease with a carrier frequency of approximately 1:100 in most Caucasian populations. The disease is implicated in sudden unexpected death in childhood. A prevalent disease-causing point mutation (A985G) in the MCAD gene has been characterized, thus rendering diagnosis easy in the majority of cases. Since the clinical spectrum of MCAD deficiency ranges from death in the first days of life to an asymptomatic life, there are probably other genetic factors—in addition to MCAD mutations—involved in the expression of the disease. Thus, families who have experienced the death of a child from MCAD deficiency might have an increased risk of a seriously affected subsequent child. In such a family we have therefore performed a prenatal diagnosis on a chorionic villus sample by a highly specific and sensitive polymerase chain reaction (PCR) assay for the G985 mutation. The analysis was positive and resulted in abortion. We verified the diagnosis by direct analysis on blood spots and other tissue material from the aborted fetus and from family members. 相似文献