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   23441篇
  免费   1968篇
  国内免费   45篇
耳鼻咽喉   238篇
儿科学   906篇
妇产科学   605篇
基础医学   3054篇
口腔科学   659篇
临床医学   2963篇
内科学   4535篇
皮肤病学   316篇
神经病学   2099篇
特种医学   932篇
外科学   3247篇
综合类   381篇
一般理论   43篇
预防医学   2201篇
眼科学   345篇
药学   1406篇
  2篇
中国医学   16篇
肿瘤学   1506篇
  2023年   148篇
  2022年   160篇
  2021年   369篇
  2020年   293篇
  2019年   397篇
  2018年   459篇
  2017年   427篇
  2016年   416篇
  2015年   517篇
  2014年   670篇
  2013年   882篇
  2012年   1149篇
  2011年   1237篇
  2010年   717篇
  2009年   654篇
  2008年   1111篇
  2007年   1195篇
  2006年   1112篇
  2005年   1099篇
  2004年   965篇
  2003年   956篇
  2002年   817篇
  2001年   650篇
  2000年   635篇
  1999年   523篇
  1998年   268篇
  1997年   224篇
  1996年   229篇
  1995年   230篇
  1994年   205篇
  1993年   179篇
  1992年   475篇
  1991年   462篇
  1990年   437篇
  1989年   432篇
  1988年   400篇
  1987年   357篇
  1986年   307篇
  1985年   378篇
  1984年   288篇
  1983年   261篇
  1982年   162篇
  1979年   211篇
  1978年   182篇
  1977年   152篇
  1976年   148篇
  1975年   159篇
  1974年   158篇
  1973年   197篇
  1972年   159篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
151.
Background: Features of the urban physical environment may be linked to the development of high blood pressure, a leading risk factor for global burden of disease.Objectives: We examined associations of urban physical environment features with hypertension and blood pressure measures in adults across 230 Latin American cities.Methods: In this cross-sectional study we used health, social, and built environment data from the SALud URBana en América Latina (SALURBAL) project. The individual-level outcomes were hypertension and levels of systolic and diastolic blood pressure. The exposures were city and subcity built environment features, mass transit infrastructure, and green space. Odds ratios (ORs) and mean differences and 95% confidence intervals (CIs) were estimated using multilevel logistic and linear regression models, with single- and multiple-exposure models adjusted for individual-level age, sex, education, and subcity educational attainment.Results: A total of 109,176 participants from 230 cities and eight countries were included in the hypertension analyses and 50,228 participants from 194 cities and seven countries were included in the blood pressure measures analyses. Participants were 18–97 years of age. In multiple-exposure models, higher city fragmentation was associated with higher odds of having hypertension (OR per standard deviation (SD) increase=1.11; 95% CI: 1.01, 1.21); presence (vs. no presence) of mass transit in the city was associated with higher odds of having hypertension (OR=1.30; 95% CI: 1.09, 1.54); higher subcity population density was associated with lower odds of having hypertension (OR per SD increase=0.90; 95% CI: 0.85, 0.94); and higher subcity intersection density was associated with higher odds of having hypertension [OR per SD increase=1.09; 95% CI: 1.04, 1.15). The presence of mass transit was also associated with slightly higher systolic and diastolic blood pressure in multiple-exposure models adjusted for treatment. Except for the association between intersection density and hypertension, associations were attenuated after adjustment for country. An inverse association of greenness with continuous blood pressure emerged after country adjustment.Discussion: Our results suggest that urban physical environment features—such as fragmentation, mass transit, population density, and intersection density—may be related to hypertension in Latin American cities. Reducing chronic disease risks in the growing urban areas of Latin America may require attention to integrated management of urban design and transport planning. https://doi.org/10.1289/EHP7870  相似文献   
152.
153.
I am convinced of merits of physiotherapy used in European Clinics.I am well satisfied with the apparatus for the physical treatment of disease in my own office.I use ultraviolet light, radiant light, baking, sinusoidal current, also x-ray, radium, massage and heat, each application having its own particular field.I do not use hydrotherapy, though I believe it to be of great value.A correct diagnosis must first be made in order to select the proper physical measure of treatment.The treatment must be prolonged and consistent. It will shorten the period of disability in practically all cases following accidents and injuries.Physical therapeutic measures must. not be blindly applied. At least a general if not a detailed knowledge of their effects must be possessed.They are of great value and will increasingly become more used in the treatment of fractures, of abdominal adhesions, chronic pelvic inflammation, proliferative cars tissue, and in general infections, both acute and chronic.  相似文献   
154.
The introduction of vaccinia virus into the skin of swine calls forth a typical vesicular reaction which may be followed by a solid immunity. This acquired state of resistance was utilized in determining the route of immunity transmission from sow to young. The suckling young of immune sows, vaccinated on the 7th day or earlier, showed no reaction to the virus. Their hand-fed litter mates, however, were susceptible and reacted with the formation of vesicles. These observations indicate that the porcine placenta is largely impermeable to protective substances and establish the fact that colostrum functions as the vehicle for their transmission as it does for antibodies.  相似文献   
155.
156.
Yellow fever virus from M. rhesus has been inoculated into a South American monkey (Cebus macrocephalus) by blood injection and by bites of infected mosquitoes. The Cebus does not develop the clinical or pathological signs of yellow fever. Nevertheless, the virus persists in the Cebus for a time as shown by the typical symptoms and lesions which develop when the susceptible M. rhesus is inoculated from a Cebus by direct transfer of blood or by mosquito (A. aegypti) transmission.  相似文献   
157.
158.
159.
160.
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