全文获取类型
收费全文 | 2020篇 |
免费 | 40篇 |
国内免费 | 25篇 |
专业分类
安全科学 | 75篇 |
废物处理 | 93篇 |
环保管理 | 222篇 |
综合类 | 341篇 |
基础理论 | 409篇 |
环境理论 | 1篇 |
污染及防治 | 581篇 |
评价与监测 | 219篇 |
社会与环境 | 121篇 |
灾害及防治 | 23篇 |
出版年
2023年 | 21篇 |
2022年 | 41篇 |
2021年 | 59篇 |
2020年 | 35篇 |
2019年 | 31篇 |
2018年 | 68篇 |
2017年 | 77篇 |
2016年 | 94篇 |
2015年 | 62篇 |
2014年 | 99篇 |
2013年 | 158篇 |
2012年 | 78篇 |
2011年 | 133篇 |
2010年 | 86篇 |
2009年 | 89篇 |
2008年 | 113篇 |
2007年 | 116篇 |
2006年 | 77篇 |
2005年 | 69篇 |
2004年 | 73篇 |
2003年 | 86篇 |
2002年 | 58篇 |
2001年 | 65篇 |
2000年 | 39篇 |
1999年 | 32篇 |
1998年 | 19篇 |
1997年 | 16篇 |
1996年 | 12篇 |
1995年 | 14篇 |
1994年 | 16篇 |
1993年 | 17篇 |
1992年 | 18篇 |
1991年 | 5篇 |
1990年 | 5篇 |
1989年 | 7篇 |
1988年 | 7篇 |
1987年 | 5篇 |
1986年 | 5篇 |
1985年 | 8篇 |
1984年 | 6篇 |
1983年 | 10篇 |
1982年 | 10篇 |
1981年 | 8篇 |
1979年 | 4篇 |
1976年 | 6篇 |
1970年 | 2篇 |
1967年 | 3篇 |
1966年 | 2篇 |
1962年 | 5篇 |
1961年 | 2篇 |
排序方式: 共有2085条查询结果,搜索用时 953 毫秒
431.
432.
四种南京地产栽培野菜蛋白质营养价值的评价研究 总被引:13,自引:0,他引:13
4种传统野菜已在南京地区规模栽培利用。采用模糊识别法和氨基酸比值系数法,分别以鸡蛋蛋白质为标准蛋白 ,以WHO/FAO氨基酸参考模式为评价标准 ,对这4种野菜蛋白质营养价值进行了评价 ,并与6种常见蔬菜蛋白进行对照比较。结果表明 ,4种野菜蛋白质含量为2.3 %~5.0 % ,蛋白质中氨基酸种类齐全 ,其含量为77.73 %~89.36 % ,必需氨基酸占总氨基酸量的36.72 %~42.04 % ,第一限制性氨基酸为含硫氨基酸 (Met +Cys)。其蛋白质营养价值分别优于同科的一些常见蔬菜。 相似文献
433.
A. Merino A. De Perdigo F. Nombalais M. Yvinec M. G. Le Roux V. Bellec 《黑龙江环境通报》1993,13(10):1001-1007
We present two prenatal cases of trisomy 9 mosaicism, both of which presented intrauterine growth retardation (IUGR) and other abnormal ultrasound findings. In case A, mosaicism was found in amniotic fluid cell cultures, of which 65 per cent were trisomic cells, on average. In case B, trisomic cells were present in amniotic fluid cell cultures (12 per cent) but none were found in fetal cord blood. After autopsy, cytogenetic findings were confirmed in different tissue cultures. It is concluded that echographic indicators are a very useful tool for a correct prenatal diagnostic interpretation of trisomy 9. Suspected trisomy 9 mosaicism always requires further investigation and fetal cord blood cytogenetic analysis may not be considered as providing an accurate diagnosis of fetal trisomy 9. 相似文献
434.
435.
436.
437.
438.
G. Loudianos A. L. Figus A. Loi A. Angius V. Dessì M. Deiana S. De Virgiliis G. Monni A. Cao M. Pirastu M.D. 《黑龙江环境通报》1994,14(10):999-1002
This paper describes a case of prenatal diagnosis for Wilson disease (WD) carried out in an at-risk couple of Sardinian descent, following non-directive genetic counselling. Diagnosis was obtained by using eight microsatellites located within or flanking the WD locus, six of which were 100 per cent and two 50 per cent informative. The use of several markers may limit the occurrence of misdiagnosis resulting from recombination or instability of repeats. 相似文献
439.
Dr Harini Narayan Richard De Chazal Margaret Barrow Patricia McKeever Edmund Neale 《黑龙江环境通报》1993,13(10):893-901
Congenital diaphragmatic hernia (CDH) is a developmental defect of as yet unknown aetiology which accounts for 8 per cent of all major congenital anomalies and is associated with up to 80 per cent mortality despite optimal postnatal treatment. The risk of recurrence of CDH for future sibs after one affected infant is about 2 per cent. A multifactorial/threshold inheritance pattern with an observed high male:female sex ratio is currently favoured for the rare occurrence of familial CDH, although other modes of inheritance have also been described. We report three cases of familial CDH, two of whom were brother and sister sibs and the third was a first cousin, born within 18 months of each other. The diagnosis was by ultrasound and there were several factors predicting a poor outcome. The mortality in this group was 100 per cent. The prenatal diagnosis, treatment options, the unusual genetic aspects, outcome, and the pathology involved are discussed. 相似文献
440.
Oil spills caused by maritime transport of petroleum products are still an important source of ocean pollution, especially in main production areas and along major transport routes. We here provide a historical and geographic analysis of the major oil spills (>700 t) since 1960. Spills were recorded from several key marine ecosystems and marine biodiversity hotspots. The past four decades have been characterized by an overall decrease in the number of accidents and tonnes of oil spilled in the sea, but this trend was less distinct in the European Atlantic area. Recent black tides from the Erika and Prestige vessels provided new evidence for the high risk of accidents with serious ecological impact in this area, which according to our analysis is historically the most important oil spill hotspot worldwide. The English Channel and waters around Galicia in Spain were the areas with most accidents. Maritime transport in European Atlantic waters has been predicted to continue increasing. Together with our own results this suggests that, in addition to measures for increased traffic safety, deployment of emergency capacities in the spill hotspot areas may be crucial for a sustainable conservation of sea resources and ecosystems.Electronic Supplementary Material Supplementary material is available for this article if you access the article at . A link in the frame on the left on that page takes you directly to the supplementary material. 相似文献