全文获取类型
收费全文 | 15947篇 |
免费 | 1408篇 |
国内免费 | 12篇 |
出版年
2023年 | 71篇 |
2021年 | 270篇 |
2020年 | 145篇 |
2019年 | 212篇 |
2018年 | 274篇 |
2017年 | 209篇 |
2016年 | 383篇 |
2015年 | 649篇 |
2014年 | 728篇 |
2013年 | 1020篇 |
2012年 | 1142篇 |
2011年 | 1158篇 |
2010年 | 728篇 |
2009年 | 662篇 |
2008年 | 977篇 |
2007年 | 1015篇 |
2006年 | 953篇 |
2005年 | 888篇 |
2004年 | 877篇 |
2003年 | 840篇 |
2002年 | 762篇 |
2001年 | 188篇 |
2000年 | 142篇 |
1999年 | 188篇 |
1998年 | 220篇 |
1997年 | 141篇 |
1996年 | 123篇 |
1995年 | 127篇 |
1994年 | 157篇 |
1993年 | 152篇 |
1992年 | 127篇 |
1991年 | 103篇 |
1990年 | 105篇 |
1989年 | 87篇 |
1988年 | 100篇 |
1987年 | 88篇 |
1986年 | 58篇 |
1985年 | 79篇 |
1984年 | 95篇 |
1983年 | 75篇 |
1982年 | 81篇 |
1981年 | 87篇 |
1980年 | 83篇 |
1979年 | 60篇 |
1978年 | 62篇 |
1977年 | 66篇 |
1976年 | 41篇 |
1974年 | 47篇 |
1973年 | 41篇 |
1972年 | 38篇 |
排序方式: 共有10000条查询结果,搜索用时 187 毫秒
1.
Michael P. Gustafson Yi Lin Mary L. Maas Virginia P. Van Keulen Patrick B. Johnston Tobias Peikert Dennis A. Gastineau Allan B. Dietz 《PloS one》2015,10(3)
The development of flow cytometric biomarkers in human studies and clinical trials has been slowed by inconsistent sample processing, use of cell surface markers, and reporting of immunophenotypes. Additionally, the function(s) of distinct cell types as biomarkers cannot be accurately defined without the proper identification of homogeneous populations. As such, we developed a method for the identification and analysis of human leukocyte populations by the use of eight 10-color flow cytometric protocols in combination with novel software analyses. This method utilizes un-manipulated biological sample preparation that allows for the direct quantitation of leukocytes and non-overlapping immunophenotypes. We specifically designed myeloid protocols that enable us to define distinct phenotypes that include mature monocytes, granulocytes, circulating dendritic cells, immature myeloid cells, and myeloid derived suppressor cells (MDSCs). We also identified CD123 as an additional distinguishing marker for the phenotypic characterization of immature LIN-CD33+HLA-DR- MDSCs. Our approach permits the comprehensive analysis of all peripheral blood leukocytes and yields data that is highly amenable for standardization across inter-laboratory comparisons for human studies. 相似文献
2.
Mohammed Mamdani Vernell Williamson Gowon O. McMichael Tana Blevins Fazil Aliev Amy Adkins Laura Hack Tim Bigdeli Andrew D. van der Vaart Bradley Todd Web Silviu-Alin Bacanu Gursharan Kalsi COGA Consortium Kenneth S. Kendler Michael F. Miles Danielle Dick Brien P. Riley Catherine Dumur Vladimir I. Vladimirov 《PloS one》2015,10(9)
3.
Catherine J. Taylor Ben J. Carrick Lesley Galbraith Stephen G. Wilkinson 《FEMS microbiology letters》1993,106(1):65-69
Abstract Reference strains of ' Pseudomonas diazotrophicus ' produce a range of polar lipids atypical of authentic Pseudomonas species. In addition to the phospholipids common in Gram-negative bacteria (phosphatidylglycerol, diphosphatidylglycerol, and phosphatidylethanolamine), N -methylated derivatives of phosphatidylethanolamine (including phosphatidylcholine) and an ornithine amide lipid are also present. The preponderant ester-bound fatty acid (up to 80% of the total) is cis -vaccenic acid ( cis -octadec-11-enoic acid), while 3-hydroxyoctadecanoic acid is the major amide-bound fatty acid in the ornithine lipid. Possible implications of the data for classification of the organism are discussed. 相似文献
4.
5.
Séverine Bontron V. Steimle Catherine Ucla Martha M. Eibl B. Mach 《Human genetics》1997,99(4):541-546
Congenital MHC class II deficiency or bare lymphocyte syndrome (BLS; McKusick 209920) is caused by defects in trans-acting
regulatory factors that control MHC class II expression and is therefore a disease of gene regulation. There are at least
four complementation groups and the genetic and molecular dissection of this rare disease has contributed considerably to
our current understanding of the molecular mechanisms governing MHC class II expression. Identification of the gene that is
defective in BLS complementation group A, CIITA (MHC class II transactivator), has led to the discovery that CIITA acts as
a master control factor of MHC class II expression. We have identified the CIITA mutations in a second patient from BLS group
A. Two novel mutations abolish CIITA function, as shown by transfection experiments. Molecular analysis of these two novel
mutations, together with the one described earlier in the first patient, is informative in terms of CIITA structure-function
relationships.
Received: 19 October 1996 / Revised: 25 November 1996 相似文献
6.
7.
Wasabi (Wasabia japonica) is a unique native plant and a traditional condiment crop of Japan. It is used in traditional Japanese raw fish and noodle dishes and in several modern foods for its hot taste and tangy flavor. Japanese farmers grow the crop in wet upland orchard soils for leaves, petioles and small enlarged stems, and in flooded gravel and sand fields along streams or near springs to produce whole plants and large succulent green enlarged stems. Recent studies in Japan have demonstrated numerous enzymatic and biocidal properties of the plant. This review of Japanese and other literature details the history, uses, botany, cultivars, ecological requirements, production techniques, insect pests and diseases of wasabi. 相似文献
8.
9.
10.