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   7347篇
  免费   774篇
  国内免费   11篇
耳鼻咽喉   49篇
儿科学   275篇
妇产科学   167篇
基础医学   1128篇
口腔科学   101篇
临床医学   761篇
内科学   1839篇
皮肤病学   59篇
神经病学   455篇
特种医学   436篇
外科学   1056篇
综合类   155篇
一般理论   3篇
预防医学   619篇
眼科学   86篇
药学   562篇
中国医学   10篇
肿瘤学   371篇
  2021年   103篇
  2020年   61篇
  2019年   112篇
  2018年   111篇
  2017年   84篇
  2016年   84篇
  2015年   115篇
  2014年   156篇
  2013年   210篇
  2012年   338篇
  2011年   332篇
  2010年   191篇
  2009年   166篇
  2008年   331篇
  2007年   313篇
  2006年   340篇
  2005年   304篇
  2004年   294篇
  2003年   294篇
  2002年   330篇
  2001年   325篇
  2000年   282篇
  1999年   219篇
  1998年   103篇
  1997年   95篇
  1996年   99篇
  1995年   75篇
  1994年   65篇
  1993年   60篇
  1992年   158篇
  1991年   165篇
  1990年   139篇
  1989年   152篇
  1988年   149篇
  1987年   167篇
  1986年   147篇
  1985年   135篇
  1984年   105篇
  1983年   72篇
  1982年   70篇
  1981年   59篇
  1980年   46篇
  1979年   72篇
  1978年   78篇
  1977年   68篇
  1976年   65篇
  1975年   58篇
  1974年   83篇
  1973年   68篇
  1972年   52篇
排序方式: 共有8132条查询结果,搜索用时 640 毫秒
1.
2.
3.
PURPOSE: The effectiveness of a point of dispensing (POD) used in a mass dispensing exercise was evaluated. METHODS: Public Health-Seattle & King County (PHSKC), in conjunction with the University of Washington, conducted a functional exercise of mass dispensing plans to test the effectiveness of a POD. Specifically, the organization and maintenance of patient flow, staffing model, signage, and dissemination of public information were evaluated. A data collection application using cellular telephones was used to record time and patient flow data to evaluate patient flow. Questionnaires distributed to staff and volunteer patients at the end of the exercise obtained feedback regarding the setup, organization, and operations of the POD. RESULTS: The POD was operational for approximately 68 minutes. The majority of POD staff reported feeling comfortable with their specific job tasks and duties within 15 minutes of opening the doors to the POD to the public. Staff questionnaires also revealed a high level of self-reported confidence in their ability and in the ability of their colleagues to perform the job-specific responsibilities required of them or respond to this hypothetical event. The majority of volunteer patients found the signs helpful and easy to follow and the check-in form easy to complete. Despite efforts to provide patients with oral and written information about the medications being dispensed, only 80% indicated that they knew how to take the medication, and only 73% reported understanding the medication instructions for all the individuals for whom they picked up medication. CONCLUSION: The majority of volunteer patients and staff who participated in a functional exercise of mass dispensing plans found the POD to be effective. Time-flow analysis provided preliminary estimates of the total amount of time needed to complete the dispensing process for each head of household.  相似文献   
4.
Pain control is one of the most challenging aspects in the management of chronic pancreatitis. Total pancreatectomy can successfully relieve the intractable abdominal pain in these patients but will inevitably result in insulin-dependent diabetes. Islet autotransplantation aims to preserve, as far as possible, the insulin secretory function of the islet cell mass thereby reducing (or even removing) the requirement for exogenous insulin administration after a total pancreactomy. Despite the relatively small number of centres able to perform these procedures, there are important technical variations in the details of their approaches. The aim of this review is to provide details of the current surgical practice for total pancreatectomy combined with islet autotransplantation, and outline the potential advantages and disadvantages of the variations adopted in each centre.  相似文献   
5.
The second documented case of renal aspergilloma due to Aspergillusflavus is presented. The merits of the medical therapy thatfailed are discussed. Pathological examination showed a nidusof aspergillus around suture material persisting from a pyelolithotomyoperation 2 years before in India. We argue that this was thereason for the failure of the medical therapy. This is the firstcase of its kind reported.  相似文献   
6.
7.
This study examined the relationship between risk factors and initiation of alcohol use over a 15-month period among a cohort of 7th graders who were abstainers at the time of initial testing. The relationship between risk factors and alcohol use was examined using a discriminant function analysis. At the univariate level, rejection of parental authority, deviant behavior, and sensation seeking were statistically significant. The discriminant function retained only three of the risk factors: rejection of parental authority, deviant behavior, and religious commitment. Implications for school-based prevention programs are discussed, particularly the need to target primary prevention programs based upon adolescents' risk.  相似文献   
8.
9.
10.
The major surface glycoprotein of Leishmania (GP63) is present on all known species of Leishmania and likely plays an integral role during the infection of macrophages in the mammalian host. To identify regions of GP63 which may be of functional significance, the nucleotide sequence of a gene encoding GP63 of Leishmania donovani was determined and compared to the sequences reported for GP63 genes of Leishmania major and Leishmania chagasi. The GP63 nucleotide and predicted protein sequence was highly conserved among the 3 species despite their diverse geographical distribution. L. donovani GP63 is encoded by a multigene family and the gene locus contains at least 7 tandemly repeated genes and at least 3 genes which are dispersed from the tandem array. In addition, polymerase chain reaction and Southern blot analyses demonstrated that there was size heterogeneity within the pro-peptide coding regions of the multiple GP63 genes of L. donovani and that such genes were expressed concurrently in the promastigote life stage.  相似文献   
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