全文获取类型
收费全文 | 861022篇 |
免费 | 71526篇 |
国内免费 | 1837篇 |
专业分类
耳鼻咽喉 | 12802篇 |
儿科学 | 24623篇 |
妇产科学 | 25096篇 |
基础医学 | 124198篇 |
口腔科学 | 25484篇 |
临床医学 | 75299篇 |
内科学 | 164522篇 |
皮肤病学 | 16997篇 |
神经病学 | 70069篇 |
特种医学 | 35190篇 |
外国民族医学 | 171篇 |
外科学 | 136148篇 |
综合类 | 24603篇 |
现状与发展 | 2篇 |
一般理论 | 263篇 |
预防医学 | 66865篇 |
眼科学 | 20517篇 |
药学 | 64684篇 |
中国医学 | 1593篇 |
肿瘤学 | 45259篇 |
出版年
2018年 | 7334篇 |
2015年 | 7726篇 |
2014年 | 11105篇 |
2013年 | 16775篇 |
2012年 | 22705篇 |
2011年 | 23824篇 |
2010年 | 13859篇 |
2009年 | 13058篇 |
2008年 | 22561篇 |
2007年 | 24612篇 |
2006年 | 24485篇 |
2005年 | 24134篇 |
2004年 | 23696篇 |
2003年 | 22829篇 |
2002年 | 21922篇 |
2001年 | 35822篇 |
2000年 | 36464篇 |
1999年 | 30895篇 |
1998年 | 9220篇 |
1997年 | 8545篇 |
1996年 | 8475篇 |
1995年 | 8006篇 |
1994年 | 7723篇 |
1992年 | 26658篇 |
1991年 | 26099篇 |
1990年 | 25617篇 |
1989年 | 24677篇 |
1988年 | 23219篇 |
1987年 | 22883篇 |
1986年 | 21740篇 |
1985年 | 21097篇 |
1984年 | 16385篇 |
1983年 | 13996篇 |
1982年 | 8854篇 |
1981年 | 8201篇 |
1980年 | 7671篇 |
1979年 | 16736篇 |
1978年 | 12114篇 |
1977年 | 10181篇 |
1976年 | 9328篇 |
1975年 | 10147篇 |
1974年 | 12641篇 |
1973年 | 12136篇 |
1972年 | 11538篇 |
1971年 | 10685篇 |
1970年 | 10218篇 |
1969年 | 9909篇 |
1968年 | 8900篇 |
1967年 | 8230篇 |
1966年 | 7653篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
991.
Safety and efficacy of bariatric surgery: Longitudinal Assessment of Bariatric Surgery 总被引:3,自引:0,他引:3
Steven H. Belle Ph.D. M.Sc.Hyg. Paul D. Berk M.D. Anita P. Courcoulas M.D. M.P.H. F.A.C.S. David R. Flum M.D. M.P.H. F.A.C.S. Carolyn W. Miles Ph.D. James E. Mitchell M.D. Walter J. Pories M.D. F.A.C.S. Bruce M. Wolfe M.D. F.A.C.S. Susan Z. Yanovski M.D. Longitudinal Assessment of Bariatric Surgery Consortium Writing Group 《Surgery for obesity and related diseases》2007,3(2):116-126
992.
Philip F. Giampietro MD PhD Margaret G. E. Peterson PhD Robert Schneider MD Jessica G. Davis MD Stephen W. Burke MD Oheneba Boachie-Adjei MD Charles M. Mueller PhD RD Cathleen L. Raggio MD 《HSS journal》2007,3(1):89-92
Reduced bone mineral density (BMD) was sporadically reported in patients with Marfan syndrome. This may or may not place the
Marfan patient at increased risk for bone fracture. In comparing the BMDs of our patients with those reported in the literature,
it seemed that agreement between values, and hence the degree of osteoporosis or osteopenia reported, was dependent on the
instrumentation used. The objective of this study was to statistically assess this impression. Bone mineral density measurements
from our previously published study of 30 adults with Marfan syndrome performed on a Lunar DPXL machine were compared with
studies published between 1993–2000 measured using either Lunar or Hologic bone densitometry instruments. The differences
of our measurements compared with those made on other Lunar machines were not statistically significant, but did differ significantly
with published results from Hologic machines (P < 0.001). Before progress can be made in the assessment of BMD and fracture risk in Marfan patients and in the evidence-based
orthopedic management of these patients, standardization of instrumental bone density determinations will be required along
with considerations of height, obesity, age, and sex. 相似文献
993.
B. Maurer J.H.W. Distler F. Moritz S. Gay PD Dr. O. Distler 《Zeitschrift für Rheumatologie》2007,66(4):304-310
In contrast to vasculogenesis, angiogenesis is defined as the formation of new vessels from preexisting ones. Physiologically, this multistep process occurs in adults during the reproductive cycle and during pregnancy, pathophysiologically it can be found in wound healing, inflammation and carcinogenesis. The underlying mechanisms are vasodilatation and increasing permeability, destabilization of vessel walls and degradation of extracellular matrix, followed by the proliferation and migration of endothelial cells. Migrated endothelial cells form vascular tubes at sites of ischemia and these tubes are finally stabilized by pericytes and smooth muscle cells. This process is controlled by a complex interaction of angiogenic and angiostatic factors. In contrast to carcinogenesis, the role of angiogenesis for the pathogenesis and therapy of rheumatic diseases is less understood. Two examples for pathologically disturbed angiogenesis, rheumatoid arthritis and systemic sclerosis, are discussed in this review with respect to therapeutic options. 相似文献
994.
A K Konstantinidis S J Barton I Sayers I A Yang J L Lordan S Rorke J B Clough S T Holgate J W Holloway 《The European respiratory journal》2007,30(1):40-47
Interleukin (IL)-13 plays a central role in asthma pathogenesis by binding to the IL-13 receptor, which is a heterodimer composed of the IL-13 receptor alpha1 subunit (IL-13Ralpha1) and IL-4Ralpha. The genetic diversity at the IL-13Ralpha1 gene (IL13RA1) locus on chromosome Xq24 was characterised and the association of identified polymorphisms with asthma and atopy phenotypes examined. The promoter and coding region of IL13RA1 were screened for common genetic variants, and polymorphisms found were genotyped in a large cohort of 341 asthmatic Caucasian families (each containing at least two asthmatic siblings) and 182 nonasthmatic control subjects. Genetic association was determined using case-control and transmission disequilibrium test analyses. Two common polymorphisms were identified, a newly found thymidine (T) to guanine (G) transition of nucleotide -281 (-281T>G) single nucleotide polymorphism in the IL13RA1 promoter and the previously described 1365A>G variant in the IL13RA1 proximal 3' untranslated region. No significant association of either -281T>G or 1365A>G with risk of asthma or atopy phenotypes was found, apart from a suggestive association between the IL13RA1 -281T/1365A haplotype and raised total serum immunoglobulin E levels in adult female asthmatics. These findings indicate that the interleukin-13 receptor alpha1 subunit gene -281T>G and 1365A>G polymorphisms do not contribute to asthma susceptibility or severity, although the interleukin-13 receptor alpha1 subunit gene locus might be involved in the control of immunoglobulin E production. 相似文献
995.
H. Kempf und H. W. Wedler 《Clinical and experimental medicine》1940,107(4):488-496
Ohne Zusammenfassung 相似文献
996.
The action of adrenaline upon the uterus of the guinea-pig and its modification by eserine 总被引:1,自引:0,他引:1
Agar WT 《The Journal of physiology》1940,98(4):492-502
997.
Dr. W. Dobrowolsky 《Albrecht von Graefes Archiv fur klinische und experimentelle Ophthalmologie》1872,18(1):53-103
Ohne Zusammenfassung 相似文献
998.
W. F. H. Ströer 《Anatomy and embryology》1939,110(2):301-321
Zusammenfassung Die Fasern des primären optischen Systems lassen sich bei allen Wirbeltieren in zwei Gruppen einteilen, welche der vorderen und hinteren Retinahälfte entstammen und sich bis zu ihren Endstationen morphologisch nachweisen lassen. Es wurde versucht, dieses anatomische Verhalten mit einigen physiologischen Eigenschaften des Auges in Verbindung zu bringen.Mit 17 zum Teil farbigen Textabbildungen. 相似文献
999.
1000.