全文获取类型
收费全文 | 1396067篇 |
免费 | 125665篇 |
国内免费 | 3724篇 |
专业分类
耳鼻咽喉 | 21003篇 |
儿科学 | 45900篇 |
妇产科学 | 37158篇 |
基础医学 | 192112篇 |
口腔科学 | 36118篇 |
临床医学 | 142034篇 |
内科学 | 289593篇 |
皮肤病学 | 34294篇 |
神经病学 | 115338篇 |
特种医学 | 52507篇 |
外国民族医学 | 265篇 |
外科学 | 215581篇 |
综合类 | 25970篇 |
现状与发展 | 74篇 |
一般理论 | 569篇 |
预防医学 | 110755篇 |
眼科学 | 31083篇 |
药学 | 93364篇 |
6篇 | |
中国医学 | 2026篇 |
肿瘤学 | 79706篇 |
出版年
2021年 | 12105篇 |
2019年 | 11915篇 |
2018年 | 20226篇 |
2017年 | 17031篇 |
2016年 | 18870篇 |
2015年 | 20620篇 |
2014年 | 32183篇 |
2013年 | 41646篇 |
2012年 | 42506篇 |
2011年 | 45027篇 |
2010年 | 32482篇 |
2009年 | 35190篇 |
2008年 | 43036篇 |
2007年 | 44056篇 |
2006年 | 45847篇 |
2005年 | 42547篇 |
2004年 | 40243篇 |
2003年 | 37748篇 |
2002年 | 36693篇 |
2001年 | 59496篇 |
2000年 | 59778篇 |
1999年 | 50983篇 |
1998年 | 16632篇 |
1997年 | 15299篇 |
1996年 | 15629篇 |
1995年 | 14759篇 |
1994年 | 12803篇 |
1993年 | 11788篇 |
1992年 | 39400篇 |
1991年 | 38922篇 |
1990年 | 37386篇 |
1989年 | 36292篇 |
1988年 | 33569篇 |
1987年 | 32794篇 |
1986年 | 31299篇 |
1985年 | 29406篇 |
1984年 | 22420篇 |
1983年 | 19627篇 |
1982年 | 11810篇 |
1979年 | 21204篇 |
1978年 | 15678篇 |
1977年 | 13146篇 |
1976年 | 12057篇 |
1975年 | 13044篇 |
1974年 | 15787篇 |
1973年 | 15572篇 |
1972年 | 14778篇 |
1971年 | 13731篇 |
1970年 | 13004篇 |
1969年 | 12129篇 |
排序方式: 共有10000条查询结果,搜索用时 312 毫秒
991.
992.
U. Bolm-Audorff S. Brandenburg T. Brüning H. Dupuis R. Ellegast G. Elsner K. Franz H. Grasshoff V. Grosser L. Hanisch B. Hartmann E. Hartung K. G. Hering G. Heuchert M. Jäger J. Krämer Dr. A. Kranig E. Ludolph A. Luttmann A. Nienhaus W. Pieper K.-D. Pöhl T. Remé D. Riede G. Rompe K. Schäfer S. Schilling E. Schmitt F. Schröter A. Seidler M. Spallek M. Weber 《Trauma und Berufskrankheit》2005,7(3):211-252
Occupational diseases Nos. 2108 and 2110 correspond to intervertebral disc-related diseases of the lumbar spine from many years of carrying or lifting heavy loads, occupations in extreme postures of full flexion or oscillation of the whole body when seated, and which compel the cessation of all activities which are or could be the cause for the origin, exacerbation or recurrence of the disease. These occupational diseases came into force at the start of 1993, but there have been considerable problems in their implementation. The present Part I of the contribution is the result of the work of an interdisciplinary study group and contains medical criteria for the assessment of possibly strain-related clinical characteristics and the evaluation of other possible causes. Part II is to be published in Volume 4/2005 and will deal with questions related to forced cessation and to the assessment of the loss of earning ability. Agreement was reached in many areas related to the assessment of occupational claims. This should allow for evidence-based decision making in the future for the occupational diseases Nos. 2108 and 2110. 相似文献
993.
994.
995.
The β‐adhesin part of the Porphyromonas gingivalis W50 (ATCC 53978) protease HRgpA was cloned in an eukaryotic expression vector and expressed in COS‐7 cells. The monoclonal antibody MAb (61BG1.3), specific for the hemagglutinating domain of β‐adhesin, recognized the expressed β‐adhesin in the transfected cells both by immunoblot and immunofluorescence. Sprague Dawley rats were immunized intramuscularly with β‐adhesin encoding expression plasmid and expression plasmid without β‐adhesin insert. Skeletal muscle tissue at the site of immunization in the β‐adhesin immunized animals was shown to express this protein. The immunization induced a β‐adhesin‐specific antibody response. Sera from the immunized animals were tested for hemagglutination inhibiting activity. Due to high natural inhibiting activity in all rat sera tested, no increased hemagglutination inhibition was detected in sera from the β‐adhesin immunized animals. 相似文献
996.
997.
Multivitamin and alcohol intake and folate receptor alpha expression in ovarian cancer. 总被引:2,自引:0,他引:2
Linda E Kelemen Thomas A Sellers Gary L Keeney Wilma L Lingle 《Cancer epidemiology, biomarkers & prevention》2005,14(9):2168-2172
Folate receptor alpha (FRalpha) expression in epithelial ovarian cancer may be related to folate intake. We examined this association using multivitamin intake, a proxy for folic acid, and assessed whether the relation was modified by alcohol intake, a folate agonist. Cases (n = 148) with suspected epithelial ovarian cancer, of ages > or = 20 years, were seen at Mayo Clinic, Minnesota, between 2000 and 2004; those with tumor specimens (n = 108) were included in analyses. Outpatient controls (n = 148) without cancer and with at least one ovary intact were matched to cases by age (within 5 years) and state of residence. Multivitamin (> or = 4 pills/wk) and weekly alcohol (> or = 5 drinks) intakes were assessed. Tumor specimens were analyzed immunohistochemically for FRalpha. Multivariable rate ratios (RR) and 95% confidence intervals (CI) were estimated using unconditional logistic regression. In case-control analysis, the RRs of multivitamin intake with absent/weak/moderate and strong-expressing FRalpha tumors were 0.30 (95% CI, 0.12-0.70) and 0.47 (95% CI, 0.24-0.91), respectively. For alcohol, the associations were 0.84 (95% CI, 0.24-2.86) and 1.65 (95% CI, 0.69-3.93), respectively. In case-case analysis, the RR associated with developing strong-expressing versus other FRalpha tumors was 3.13 (95% CI, 1.14-8.65) for multivitamins and 1.58 (95% CI, 0.45-5.60) for alcohol. The data did not support evidence for an interaction between multivitamin and alcohol intake with risk of developing a strong-expressing FRalpha tumor. The association of multivitamin intake with ovarian cancer may depend on FRalpha expression level. 相似文献
998.
999.
1000.
Raymond E B Anakwe 《European journal of emergency medicine》2005,12(3):133-135
Traumatic aortic transection is an uncommon but often fatal injury. It is typically a high energy injury and may occur in the multiply injured patient. This injury is often missed. There is evidence that airbags and seat belts protect against these injuries. We present the case of a patient who survived. 相似文献