全文获取类型
收费全文 | 446215篇 |
免费 | 51613篇 |
国内免费 | 738篇 |
出版年
2018年 | 4170篇 |
2017年 | 4020篇 |
2016年 | 5726篇 |
2015年 | 8279篇 |
2014年 | 9631篇 |
2013年 | 12975篇 |
2012年 | 15388篇 |
2011年 | 15848篇 |
2010年 | 10483篇 |
2009年 | 9525篇 |
2008年 | 13890篇 |
2007年 | 14326篇 |
2006年 | 13471篇 |
2005年 | 12859篇 |
2004年 | 12911篇 |
2003年 | 12054篇 |
2002年 | 11692篇 |
2001年 | 18928篇 |
2000年 | 18866篇 |
1999年 | 15092篇 |
1998年 | 5641篇 |
1997年 | 5641篇 |
1996年 | 5374篇 |
1995年 | 5163篇 |
1994年 | 4859篇 |
1993年 | 4861篇 |
1992年 | 12484篇 |
1991年 | 12443篇 |
1990年 | 12207篇 |
1989年 | 11676篇 |
1988年 | 10845篇 |
1987年 | 10214篇 |
1986年 | 9742篇 |
1985年 | 9514篇 |
1984年 | 7887篇 |
1983年 | 6842篇 |
1982年 | 5144篇 |
1981年 | 4632篇 |
1980年 | 4317篇 |
1979年 | 7350篇 |
1978年 | 5969篇 |
1977年 | 5291篇 |
1976年 | 4961篇 |
1975年 | 5771篇 |
1974年 | 6303篇 |
1973年 | 6121篇 |
1972年 | 5458篇 |
1971年 | 5076篇 |
1970年 | 4276篇 |
1969年 | 4203篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
171.
Peak area matching and linear regression were used to quantify eight chlorinated pesticides and polychlorinated biphenyls (as Aroclor 1260) in human serum. There are no statistically significant differences in data obtained by these two quantifying techniques which were indicated by the paired t-test. For chlorinated pesticides, p = 0.053-0.62, and for polychlorinated biphenyls (as Aroclor 1260), p = 0.64. Analyte residues for the chlorinated pesticides ranged from 0.5 ppb for hexachlorobenzene (HCB) to 186 ppb for dichlorodiphenyldichloroethylene (DDE). Analyte residues for the polychlorinated biphenyls (as Aroclor 1260) ranged from 5-114 ppb. The absolute mean percent difference between the two quantifying techniques ranged from 0.06% for DDE to 8.06% for dieldrin (HEOD) among the chlorinated pesticides. The absolute mean percent difference between the two quantifying techniques for the polychlorinated biphenyls (as Aroclor 1260) was 3.4%. Peak area matching and linear regression were found to be comparable for quantifying these environmental residues in serum when the following conditions apply: 1) the concentration of the chlorinated pesticides is greater than or equal to 0.5 ppb (e.g., HCB, hexachlorocyclohexane (HCCH), oxychlordane (OC), heptachlor epoxide (HE), transnonachlor (TN), HEOD, and dichlorodiphenyltrichloroethane (DDT); 2) the concentration of the chlorinated pesticide is greater than or equal to 3 ppb (e.g., DDE); and 3) the total concentration of polychlorinated biphenyls (e.g., as Aroclor 1260) is greater than or equal to 5 ppb. 相似文献
172.
Female mice were given different dosages (0, 3.0, 7.5, 15.0, or 30 muCi/ml) of tritium in their drinking water continuously from 3 to 7 weeks of age to assess the effects on germ cell chromosomes. At 8-9 weeks of age, mice were superovulated and metaphase II oocytes were processed and C-banded for cytogenetic analyses. Chromatid acentric fragments were the only type of structural aberration detected, and their incidence was higher in controls than in any of the tritiated water (HTO) groups. Analysis of numerical chromosomal aberrations revealed that the incidence of hypoploid (N = 19) oocytes was higher in oocytes from mice who drank HTO as compared with controls. However, the effects of HTO upon aneuploidy induction was not definitive due to the increase the incidence of aberrations in mouse oocytes can be related to the low dose rate resulting from chronic HTO exposure and possibly death of tritium-damaged cells. 相似文献
173.
174.
175.
176.
177.
178.
179.
180.