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   2334篇
  免费   192篇
  国内免费   17篇
耳鼻咽喉   9篇
儿科学   43篇
妇产科学   25篇
基础医学   402篇
口腔科学   17篇
临床医学   260篇
内科学   320篇
皮肤病学   42篇
神经病学   267篇
特种医学   141篇
外科学   348篇
综合类   72篇
一般理论   3篇
预防医学   280篇
眼科学   25篇
药学   166篇
肿瘤学   123篇
  2021年   22篇
  2020年   20篇
  2019年   19篇
  2018年   34篇
  2017年   20篇
  2016年   35篇
  2015年   30篇
  2014年   62篇
  2013年   155篇
  2012年   104篇
  2011年   116篇
  2010年   79篇
  2009年   64篇
  2008年   111篇
  2007年   136篇
  2006年   123篇
  2005年   117篇
  2004年   91篇
  2003年   76篇
  2002年   84篇
  2001年   72篇
  2000年   66篇
  1999年   64篇
  1998年   50篇
  1997年   32篇
  1996年   46篇
  1995年   31篇
  1994年   21篇
  1993年   12篇
  1992年   57篇
  1991年   52篇
  1990年   44篇
  1989年   49篇
  1988年   44篇
  1987年   35篇
  1986年   33篇
  1985年   27篇
  1984年   29篇
  1983年   18篇
  1982年   12篇
  1981年   18篇
  1980年   17篇
  1979年   17篇
  1978年   12篇
  1977年   13篇
  1976年   19篇
  1975年   22篇
  1974年   13篇
  1972年   14篇
  1971年   11篇
排序方式: 共有2543条查询结果,搜索用时 31 毫秒
1.
In this piece I describe the process of mourning my mother since her death in 2001, via my short animated documentary ‘Oneironauts – the Dream Travellers’ (2011) and my more recent experiences as the mother of a young baby. I consider my experience in the context of Freud's ‘Mourning and Melancholia’.  相似文献   
2.
A new range of stand magnifiers has been released by the COIL company in the United Kingdom. Examination of these magnifiers reveals that they fail to deliver the rated magnifications labelled prominently on the appliances, as a result of the manufacturer's conformance with the requirements of the German DIN standard and the use of back vertex power (F'v) rather than equivalent dioptric power (Fm) of the magnifier. In this study we provide information on the optometric parameters of these new stand magnifiers that will assist the more accurate specification of improvements in vision expected from their use.  相似文献   
3.
Traumatic infarction of the spinal cord in children   总被引:2,自引:0,他引:2  
Infarction of the spinal cord in childhood is rarely due to trauma. During a 15-year period (1971 to 1985), eight children were admitted to The Hospital for Sick Children, Toronto, with a diagnosis of traumatic infarction of the spinal cord. All of these patients had delayed onset of neurological signs varying between 2 hours and 4 days after their initial trauma. No bone abnormalities were seen on plain spine x-ray films. Myelography was carried out in seven of these children and found to be normal in all seven. Six patients who were paraplegic at the time of admission remained permanently paraplegic, but two with incomplete cord signs did show some improvement.  相似文献   
4.
Knowledge of the health status of, and patterns of health care service utilization by rural Australian communities, is scant. This deficiency limits attempts to formulate policies designed to bring about efficient, effective and equitable delivery of health care services. This article reports the results of a health interview survey conducted in the Wimmera region of Victoria during spring 1984. The results demonstrate not only that patterns of morbidity in rural areas differ from the Australian average, but also that the health status of rural dwellers is worse than that of most Australians. Evidence suggests that while accessibility is not the most significant determinant of utilization of health care services, distance from services does affect propensity to use them.  相似文献   
5.
6.
Objectives Using a novel longitudinal tracking project, this study develops and evaluates the performance of a predictive model and index of rural medical practice intention based on the characteristics of incoming medical students. Methods Medical school entry survey data were obtained from the Medical Schools Outcome Database (MSOD) project implemented in all Australian and New Zealand medical schools and coordinated through Medical Deans Australia and New Zealand, the representative body for the Deans of 18 Australian and two New Zealand medical schools and faculties. The medical school commencement survey collects data on students’ education and family background, including rural upbringing, personal circumstances and scholarships, and on their practice intentions in terms of location and specialty. The MSOD will also allow tracking of medical graduates after graduation. Logistic regression modelling was used to develop a predictive model of rural practice intention. Split‐sample validation was used to gain some insight into the stability of performance of the model. Results Response rates to the MSOD survey exceeded 90% on average. The model findings confirm and extend previous research examining the association of medical student characteristics with intention to take up rural medical practice. The statistically significant independent factors in the model included students’ rural backgrounds, financial arrangements and intentions regarding specialist versus generalist practice upon graduation. Model performance was good, with an area under the receiver‐operator characteristics curve of 0.86, and reproducible, with an area in a validation sample of 0.83. Conclusions The model and related index provide important insights into individual factors associated with rural practice intention among students commencing medical studies. The model can also provide a means for optimising the use of scarce medical programme resources, thereby helping to improve the supply of rural medical practitioners. This study illustrates the power and potential of a robust, consistent, systematic longitudinal tracking project.  相似文献   
7.
M He  A S Kang  M Hamon  A S Humphreys  M Gani    M J Taussig 《Immunology》1995,84(4):662-668
The heavy chain variable region (VH) and the kappa light chain of the anti-progesterone monoclonal antibody (mAb) DB3, have been expressed as a single-chain three-domain polypeptide, designated VH/K, and secreted into the periplasmic space of Escherichia coli (E. coli). The linker sequence was derived from the VH-CH1 elbow region. The C kappa domain provides a sensitive detection tail for Western blotting and enzyme-linked immunosorbent assay (ELISA). Periplasmic extracts of transformed E. coli contained material that bound progesterone and related steroids with similar specificity and affinity to DB3, and displayed the DB3 idiotype and kappa chain epitopes. Reference to the crystal structure of DB3 suggests that all the characteristics of the combining site interaction with steroids are retained in the bacterially expressed material. Western blotting demonstrated material with a molecular weight equivalent to three domains after reduction, but six domains in the unreduced state, suggesting that the VH/K polypeptide is assembled in the periplasm as a disulphide-bridged dimer. The VH/K construct provides a novel route to expression of antibody combining sites in E. coli for antibody engineering.  相似文献   
8.
1. Nedocromil 2% iontophoresed into human skin had no effect on wealing produced by intradermal histamine, 48/80 or house dust mite antigen. 2. Iontophoresis of 0.002-2% nedocromil itself resulted in dose-related wealing. 3. This wealing was reduced by 62 +/- 8% s.e. mean by the H1-receptor antagonist terfenadine which decreased histamine wealing by 68 +/- 2% s.e. mean. 4. Nedocromil may therefore act as a weak agonist on a skin mast cell receptor concerned with histamine release.  相似文献   
9.
10.
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