全文获取类型
收费全文 | 36016篇 |
免费 | 3113篇 |
国内免费 | 65篇 |
专业分类
耳鼻咽喉 | 409篇 |
儿科学 | 1156篇 |
妇产科学 | 889篇 |
基础医学 | 4672篇 |
口腔科学 | 543篇 |
临床医学 | 4582篇 |
内科学 | 6805篇 |
皮肤病学 | 525篇 |
神经病学 | 3290篇 |
特种医学 | 1206篇 |
外国民族医学 | 8篇 |
外科学 | 4352篇 |
综合类 | 601篇 |
一般理论 | 23篇 |
预防医学 | 4180篇 |
眼科学 | 863篇 |
药学 | 2660篇 |
中国医学 | 26篇 |
肿瘤学 | 2404篇 |
出版年
2023年 | 292篇 |
2022年 | 467篇 |
2021年 | 1142篇 |
2020年 | 648篇 |
2019年 | 1077篇 |
2018年 | 1179篇 |
2017年 | 805篇 |
2016年 | 930篇 |
2015年 | 994篇 |
2014年 | 1333篇 |
2013年 | 1641篇 |
2012年 | 2462篇 |
2011年 | 2516篇 |
2010年 | 1292篇 |
2009年 | 1094篇 |
2008年 | 1866篇 |
2007年 | 1940篇 |
2006年 | 1852篇 |
2005年 | 1711篇 |
2004年 | 1621篇 |
2003年 | 1361篇 |
2002年 | 1255篇 |
2001年 | 629篇 |
2000年 | 660篇 |
1999年 | 584篇 |
1998年 | 341篇 |
1997年 | 276篇 |
1996年 | 255篇 |
1995年 | 237篇 |
1994年 | 212篇 |
1993年 | 189篇 |
1992年 | 432篇 |
1991年 | 433篇 |
1990年 | 389篇 |
1989年 | 410篇 |
1988年 | 361篇 |
1987年 | 340篇 |
1986年 | 338篇 |
1985年 | 323篇 |
1984年 | 271篇 |
1983年 | 232篇 |
1982年 | 158篇 |
1981年 | 126篇 |
1979年 | 195篇 |
1978年 | 172篇 |
1977年 | 146篇 |
1976年 | 141篇 |
1974年 | 162篇 |
1973年 | 147篇 |
1972年 | 132篇 |
排序方式: 共有10000条查询结果,搜索用时 343 毫秒
51.
D Rudman A G Feller H S Nagraj D L Jackson I W Rudman D E Mattson 《JPEN. Journal of parenteral and enteral nutrition》1987,11(4):360-363
Serum albumin was measured in 126 men (average age 70.6; range 40 to 96) of a Veterans Administration Nursing Home, and was correlated with other items in an extensive clinical data base, including death or survival during the year after the analysis. The reason for institutionalization was chronic neurologic disease or other disabling physical condition in 63 men (group A), and psychiatric disorder in 63 men (group B). In group A, the proportions of men with albumin less than 3.5, 3.5-4.0, and greater than 4.0 g/dl were 6%, 37%, and 57%, respectively. In this group, the serum albumin level was significantly (p less than 0.05) correlated with death rate, hemoglobin, hematocrit, serum cholesterol, and serum lactic dehydrogenase. The death rate in group A during the year after the albumin analysis was 25%. For the patients with albumin level less than 3.5, 3.5-4.0, and greater than 4.0 g/dl, the death rates were 50%, 43%, and 11% respectively (p less than 0.01 for comparison of the former two groups with the latter). The subgroup with albumin 3.5-4.0 g/dl represented only 37% of the men in group A, but accounted for 63% of the group's deaths. In group B, serum albumin level was not significantly correlated with any other clinical variable. Death rate during the year after the albumin analysis was only 2% in group B, and did not correlate with the albumin level. These data indicate that, in nonpsychiatric Nursing Home men, the desirable level for the serum albumin concentration is higher than 3.5 g/dl. 相似文献
52.
Hung J. Kim Torrance Jackson Konrad Noben–Trauth 《Journal of the Association for Research in Otolaryngology》2003,4(1):83-90
Genetic studies on spontaneous mouse mutants with hearing defects have provided important insights into the function of genes
expressed in inner ear hair cells. Here we report on our genetic analyses of the deaf mutants varitint-waddler (Va) and jerker
(Espnje). A high-resolution genetic map localizes VaJ to a 0.14 ± 0.08 cM region between D3Mit85 and D3Mit259 on distal chromosome
3. By comparative mapping, the human ortholog resides at 1p22.3 between markers D1S3449 and D1S2252. To study the effect of
different genetic backgrounds on the hearing phenotype, Espnje and VaJ were crossed to various inbred strains. Auditory-evoked
brainstem response tests on F2 progeny demonstrate that expression, inheritance, and penetrance of the hearing phenotype are
solely controlled by the mutant allele. To test for a genetic interaction between Espnje and Cdh23v, auditory function was
analyzed in double heterozygotes; no significant increases of thresholds of sound pressure levels were observed. The results
establish the framework for cloning the Va gene and provide valuable insights into the genetics of deafness mutations in the
mouse. 相似文献
53.
Jutta Liebau Stephanie Heidrich Alfred Berger Mayer Tenenhaus Hans-Oliver Rennekampff 《European journal of plastic surgery》2007,29(5):235-242
Re-epithelialization of cutaneous wounds is a coordinated process of proliferation and migration of keratinocytes at the wound
edge. The study objective was to identify the differences in epidermal morphology, keratinocyte proliferation and matrix molecules
(laminin 1, laminin 5, type IV collagen) and their specific integrin (α3, α6) expression in biopsies of meshed split thickness
grafted and chronic wounds. The mean mitotic index of keratinocytes (ratio of cell cycle associated antigen Ki-67 expressing
keratinocytes to basal keratinocytes) was highest in chronic wounds (38.7%) compared to acute wounds (22.25%, range 5.7% to
54%). The mean thickness of the hyper-proliferative epithelium at the wound edge of chronic wounds was 0.69 mm compared to
0.15 mm at the wound margin of split thickness grafted wounds. Both chronic wounds and skin grafted wounds exhibited strong
laminin 5 immunoreactivity at the basal side of the epithelium, which extended under the most forward keratinocytes. Laminin
1 and type IV collagen immunoreactivity did not extend to the wound margin in either skin grafted or chronic wounds. In both
transplanted skin and chronic wounds, the integrin sub-units α3 and α6 exhibited a strong pericellular immunoreactivity on
the leading keratinocytes of the wound margin. Our data demonstrates that the proliferation of keratinocytes and the expression
of associated integrins are not impaired in chronic wounds.
Presented at the 33rd Congress of the Association of German Plastic Surgeons, Germany, 18–21 September, 2002. 相似文献
54.
55.
56.
Diabetes mellitus has deleterious effects on the immune system which may lead to infection that is more serious and difficult to treat. Fifteen diabetic patients with acute bacterial sinusitis are reviewed. Diabetic pathophysiology and its relationship to infection are discussed. A protocol for treatment is outlined, with emphasis on the importance of intravenous antibiotics. 相似文献
57.
58.
59.
60.