全文获取类型
收费全文 | 379篇 |
免费 | 22篇 |
出版年
2015年 | 5篇 |
2014年 | 7篇 |
2013年 | 12篇 |
2012年 | 7篇 |
2011年 | 20篇 |
2010年 | 10篇 |
2009年 | 6篇 |
2008年 | 18篇 |
2007年 | 12篇 |
2006年 | 17篇 |
2005年 | 12篇 |
2004年 | 15篇 |
2002年 | 11篇 |
2001年 | 5篇 |
2000年 | 7篇 |
1999年 | 6篇 |
1998年 | 7篇 |
1996年 | 4篇 |
1995年 | 4篇 |
1991年 | 7篇 |
1990年 | 4篇 |
1985年 | 7篇 |
1984年 | 5篇 |
1983年 | 3篇 |
1981年 | 3篇 |
1980年 | 5篇 |
1978年 | 6篇 |
1977年 | 7篇 |
1975年 | 3篇 |
1973年 | 6篇 |
1972年 | 5篇 |
1971年 | 3篇 |
1970年 | 5篇 |
1969年 | 5篇 |
1968年 | 5篇 |
1967年 | 4篇 |
1966年 | 3篇 |
1961年 | 3篇 |
1960年 | 3篇 |
1958年 | 4篇 |
1957年 | 4篇 |
1944年 | 4篇 |
1942年 | 5篇 |
1940年 | 3篇 |
1939年 | 6篇 |
1938年 | 4篇 |
1915年 | 4篇 |
1912年 | 3篇 |
1911年 | 3篇 |
1906年 | 3篇 |
排序方式: 共有401条查询结果,搜索用时 281 毫秒
51.
52.
R S Wilbur 《The Western journal of medicine》1968,108(2):121-123
The nalorphine (pupil) test for narcotic abuse is widely used in California. It is based on the ability of nalorphine to produce mydriasis in subjects who have recently taken morphine-like drugs and to produce miosis in others. The test will usually detect as little as 15 mg of morphine or comparable doses of other narcotics for several hours except in special circumstances. It is even more reliable for detection of chronic use of narcotics. A simple card pupillometer is adequate for measuring changes in pupil size resulting from nalorphine.Analysis for narcotics in urine by thin layer chromatography is also used, either alone or in conjunction with the pupil test, to detect drug abuse. In one study which included many urine speciments from subjects who had negative pupil tests the correlation between the pupil test and urinalysis was good (85 percent). When urinalysis was used to confirm suspicion of drug use resulting from a positive or equivocal pupil test, inter-method agreement dropped to about 50 percent for various reasons. Even so, use of the pupil test for screening and urinalysis for confirmation provides a satisfactory program for detection of narcotic abuse. 相似文献
53.
Linda Green Wilbur Whittle Robert Dell''Orco Harry Ostrer Gary Stein Janet Stein 《Experimental cell research》1986,164(2):507-515
Analysis of the restriction enzyme digests of total genomic DNAs from a broad spectrum of human cell lines and from individuals with different genetic backgrounds, by hybridization with a series of cloned human histone sequences, indicated restriction site polymorphisms (RSPs) for two adjacent human histone genes which reside on chromosome 1. In most cell lines and individuals examined we observed a single 2.05 kb H4 histone HindIII fragment and a 7.0 kb H3 histone HindIII fragment. In contrast, the polymorphisms were manifested as a 2.15 kb H4 HindIII fragment and a 9.1 kb H3 HindIII fragment. From population studies, we were able to show that there is no linkage disequilibrium between these two polymorphic restriction sites. Nor was there any apparent correlation between the presence of the H3/H4 histone polymorphisms and maintenance of the transformed karyotype, passage in culture, transformation or tumor progression. These chromosome 1 H3 and H4 histone gene polymorphisms are common in the American Black population and, in our survey of individuals, were not found in the American Caucasian population. Among the American Blacks studied, the frequency of the H3 HindIII(-) allele is 43% and of the H4 HindIII(-) allele 30%. In limited family studies, we were unable to detect recombination between these two physically linked alleles. 相似文献
54.
55.
56.
57.
58.
Wilbur A. Sawyer 《The Western journal of medicine》1915,13(12):494-495
59.
60.