首页 | 本学科首页   官方微博 | 高级检索  
文章检索
  按 检索   检索词:      
出版年份:   被引次数:   他引次数: 提示:输入*表示无穷大
  收费全文   937158篇
  免费   67920篇
  国内免费   1374篇
耳鼻咽喉   13028篇
儿科学   24517篇
妇产科学   23414篇
基础医学   133952篇
口腔科学   28388篇
临床医学   81212篇
内科学   184496篇
皮肤病学   19293篇
神经病学   72632篇
特种医学   37412篇
外国民族医学   81篇
外科学   152860篇
综合类   18074篇
现状与发展   1篇
一般理论   235篇
预防医学   62132篇
眼科学   21374篇
药学   72985篇
  3篇
中国医学   2168篇
肿瘤学   58195篇
  2018年   9052篇
  2017年   7111篇
  2016年   7861篇
  2015年   8975篇
  2014年   12150篇
  2013年   17678篇
  2012年   24412篇
  2011年   25316篇
  2010年   14968篇
  2009年   14444篇
  2008年   24877篇
  2007年   26000篇
  2006年   26806篇
  2005年   25729篇
  2004年   24849篇
  2003年   23866篇
  2002年   23431篇
  2001年   54974篇
  2000年   56786篇
  1999年   47126篇
  1998年   10816篇
  1997年   9543篇
  1996年   9647篇
  1995年   8970篇
  1994年   8311篇
  1993年   7631篇
  1992年   35587篇
  1991年   34033篇
  1990年   32835篇
  1989年   31995篇
  1988年   29091篇
  1987年   28353篇
  1986年   26372篇
  1985年   25232篇
  1984年   17897篇
  1983年   15197篇
  1982年   7835篇
  1981年   6799篇
  1979年   15863篇
  1978年   10643篇
  1977年   9097篇
  1976年   7914篇
  1975年   8668篇
  1974年   10529篇
  1973年   9912篇
  1972年   9410篇
  1971年   8886篇
  1970年   8477篇
  1969年   7964篇
  1968年   7225篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
61.
62.
Blecha  S.  Weber-Carstens  S.  Bein  T. 《Der Anaesthesist》2019,68(6):343-352
Die Anaesthesiologie - Die Versorgungsforschung (VF) ist ein fachübergreifendes multidisziplinäres Forschungsgebiet, das die Kranken- und Gesundheitsversorgung sowie ihre...  相似文献   
63.
64.
Ovarian carcinoma is one of the most lethal malignancies, but only very few prognostic biomarkers are known. The degradome, comprising proteases, protease non-proteolytic homologues and inhibitors, have been involved in the prognosis of many cancer types, including ovarian carcinoma. The prognostic significance of the whole degradome family has not been specifically studied in high-grade serous ovarian cancer. A targeted DNA microarray known as the CLIP-CHIP microarray was used to identify potential prognostic factors in ten high-grade serous ovarian cancer women who had early recurrence (<1.6 years) or late/no recurrence after first line surgery and chemotherapy. In women with early recurrence, we identified seven upregulated genes (TMPRSS4, MASP1/3, SPC18, PSMB1, IGFBP2, CFI – encoding Complement Factor I – and MMP9) and one down-regulated gene (ADAM-10). Using immunohistochemistry, we evaluated the prognostic effect of these 8 candidate genes in an independent cohort of 112 high-grade serous ovarian cancer women. Outcomes were progression, defined according to CA-125 criteria, and death. Multivariate Cox proportional hazard regression models were done to estimate the associations between each protein and each outcome. High ADAM-10 expression (intensity of 2–3) was associated with a lower risk of progression (adjusted hazard ratio (HR): 0.51; 95% confidence interval (CI): 0.29-0.87). High complement factor I expression (intensity 2–3) was associated with a higher risk of progression (adjusted HR: 2.30, 95% CI: 1.17–4.53) and death (adjusted HR: 3.42; 95% CI: 1.72–6.79). Overall, we identified the prognostic value of two proteases, ADAM-10 and complement factor I, for high-grade serous ovarian cancer which could have clinical significance.  相似文献   
65.
66.

Background

Obesity is a risk factor for acetabular component malposition when total hip arthroplasty is performed with manual techniques. The utility of imageless navigation in obese patients remains unknown. This study compared the accuracy and precision of imageless navigation for component orientation between obese and nonobese patients.

Methods

A total of 459 total hip arthroplasties performed for osteoarthritis using imageless navigation were reviewed from a single surgeon’s institutional review board–approved database. Einzel-Bild-Roentgen Analyse determined component orientation on 6-week postoperative anteroposterior radiographs. Mean orientation error (accuracy) and precision were compared between obese (body mass index ≥ 30 kg/m2) and nonobese patients. Regression analysis evaluated the influence of obesity on component position.

Results

The difference in mean inclination and anteversion between obese and nonobese groups was 1.1° (43.0° ± 3.5°; range, 35.8°-57.8° vs 41.9° ± 4.4°; range, 33.0°-57.1° and 24.9° ± 6.3°; range, 14.2°-44.3° vs 23.8° ± 6.6°; range, 7.0°-38.6°, respectively). Inclination precision was better for nonobese patients. No difference in inclination accuracy or anteversion accuracy or precision was detected between groups. And 83% of components were placed within the target range. There was no relationship between obesity (dichotomized) and component placement outside the target ranges for inclination, anteversion, or both. As a continuous variable, increased body mass index correlated with higher odds of inclination outside the target zone (odds ratio, 1.06; P = .001).

Conclusion

Using imageless navigation, inclination orientation was less precise for obese patients, but the observed difference is likely not clinically relevant. Accurate superficial registration of landmarks in obese patients is achievable, and the use of imageless navigation similarly improves acetabular component positioning in obese and nonobese patients.

Level of Evidence

Therapeutic Level IV.  相似文献   
67.
Hillermann  T.  Homburg  K.  Rainer  M.  Budde  U. 《Der Anaesthesist》2022,71(4):299-302
Die Anaesthesiologie - Eine junge Patientin erleidet während der Anlage einer axillären Plexusblockade einen generalisierten Krampfanfall. Die Mechanismen, im Wesentlichen die vermutlich...  相似文献   
68.
69.
70.
设为首页 | 免责声明 | 关于勤云 | 加入收藏

Copyright©北京勤云科技发展有限公司  京ICP备09084417号