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   1047篇
  免费   42篇
  国内免费   37篇
儿科学   36篇
妇产科学   28篇
基础医学   60篇
口腔科学   37篇
临床医学   471篇
内科学   118篇
皮肤病学   6篇
神经病学   47篇
特种医学   114篇
外科学   32篇
综合类   26篇
预防医学   45篇
眼科学   7篇
药学   45篇
肿瘤学   54篇
  2023年   5篇
  2021年   3篇
  2020年   4篇
  2019年   5篇
  2018年   13篇
  2017年   4篇
  2016年   6篇
  2015年   18篇
  2014年   17篇
  2013年   38篇
  2012年   16篇
  2011年   8篇
  2010年   29篇
  2009年   35篇
  2008年   23篇
  2007年   30篇
  2006年   21篇
  2005年   17篇
  2004年   24篇
  2003年   21篇
  2002年   26篇
  2001年   37篇
  2000年   25篇
  1999年   37篇
  1998年   92篇
  1997年   86篇
  1996年   80篇
  1995年   66篇
  1994年   50篇
  1993年   56篇
  1992年   19篇
  1991年   26篇
  1990年   27篇
  1989年   22篇
  1988年   34篇
  1987年   11篇
  1986年   14篇
  1985年   12篇
  1984年   13篇
  1983年   7篇
  1982年   9篇
  1981年   6篇
  1980年   7篇
  1979年   6篇
  1978年   4篇
  1977年   3篇
  1976年   3篇
  1972年   2篇
  1971年   2篇
  1958年   2篇
排序方式: 共有1126条查询结果,搜索用时 5 毫秒
71.
72.
TOPIC: Questions regarding how severely traumatized children may meet diagnostic criteria for an accurate diagnosis of posttraumatic stress disorder (PTSD), the comorbidity of PTSD with many other psychiatric illnesses, and the possibility that PTSD is not a valid diagnostic formulation as it has been applied to children and adolescents demonstrate that the currently held concept of PTSD may not be operationally sound. PURPOSE: To explore recent empirical studies to demonstrate the current state of controversy and postulate future direction of the conceptual framework. SOURCES: Selected published literature. CONCLUSIONS: PTSD in children and adolescents, as it is popularly understood as a conceptual framework, is found to be undergoing a conceptual metamorphosis.  相似文献   
73.
TOPIC: The psychosocialfactors that affect adolescents with sickle cell disease (SCD). PURPOSE: To explore whether specific psychosocial factors can provide clues to the future adjustment of this population. SOURCES: Ovid Web, Medline, Psychinfo, and CINAHL databases for the years 1997 to 2001. CONCLUSIONS: Promoting effective psychosocial functioning is as important as managing the medical aspects of SCD, yet this is an area of care that is commonly overlooked. Nurses, therefore, have an opportunity to have a significant impact on the lives of adolescents with SCD if they intervene in ways to promote both biological and psychosocial adjustment.  相似文献   
74.
75.
76.
Diagnostic content validation of nursing diagnoses is a recommended means to confirm the defining characteristics necessary to establish a specific nursing diagnosis. The diagnostic content validity model has been used in numerous studies to develop lists of major and minor defining characteristics recommended by experts as being present in patients with specific diagnoses. The authors provide an overview of the diagnostic content validity model, review the meaning and purposes of content validity, discuss problems with information processing, and suggest revisions to the diagnostic content validity model. Incorporation of these changes may improve the usability of nursing diagnoses in clinical practice, education, and research.  相似文献   
77.
78.
79.
PROBLEM: Similar to the children in J. D. Salinger's novel, The Catcher in the Rye, youth in foster care face the specter of "going over the cliff." METHODS: The empirical basis for "treatment foster care" is reviewed, concluding that treatment foster care is both a clinically and cost-effective form of community-based treatment. FINDINGS: Treatment foster parents prevent the fall of foster youth into the chasm of school failure, involvement with juvenile justice, and dependent living as adults. CONCLUSION: Treatment foster care is an evidence-based approach that is less restrictive and offers troubled youth an opportunity to engage and grow within a family setting.  相似文献   
80.
The mechanism for the transmission of Yersinia enterocolitica in blood components has been studied experimentally. One hypothesis is that, during a Yersinia infection in the blood donor, bacteria are phagocytosed by white cells (WBCs), but are not killed. After collection of blood from such a donor and component production, the bacteria are present in WBCs for some time, during which the unit appears sterile. Later, when the WBCs disintegrate, the bacteria are released and multiply in the unit. Aliquots of whole blood and buffy coat were inoculated with 100 colony-forming units (CFU) per mL of a Y. enterocolitica strain of type O:3 and left at room temperature for 5 hours. Some aliquots were then WBC-reduced by filtration, while others retained their WBC contents. All aliquots were kept at 4 degrees C for 6 weeks. Meat extract broth culture medium was used as a control. Growth in the range of 2000 CFU per mL was obtained in the broth control by 24 hours, whereas the whole blood and buffy coat units appeared sterile for the first days of storage. After 1 week, a trace of bacteria and, after 4 weeks, massive growth were found in the WBC-containing units but not in the WBC-reduced units. The likely explanation is that the bacteria had been phagocytosed by the WBCs and were thereby hidden and not available for bacterial culture during the first phase of storage. When the WBCs spontaneously disintegrated, bacteria were released and multiplied in the blood units.(ABSTRACT TRUNCATED AT 250 WORDS)  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