全文获取类型
收费全文 | 646篇 |
免费 | 53篇 |
国内免费 | 7篇 |
专业分类
耳鼻咽喉 | 1篇 |
儿科学 | 32篇 |
妇产科学 | 4篇 |
基础医学 | 48篇 |
口腔科学 | 32篇 |
临床医学 | 61篇 |
内科学 | 148篇 |
皮肤病学 | 20篇 |
神经病学 | 29篇 |
特种医学 | 131篇 |
外科学 | 38篇 |
综合类 | 78篇 |
预防医学 | 17篇 |
药学 | 38篇 |
1篇 | |
肿瘤学 | 28篇 |
出版年
2022年 | 1篇 |
2021年 | 3篇 |
2020年 | 1篇 |
2019年 | 4篇 |
2018年 | 12篇 |
2017年 | 7篇 |
2016年 | 10篇 |
2015年 | 13篇 |
2014年 | 17篇 |
2013年 | 15篇 |
2012年 | 14篇 |
2011年 | 9篇 |
2010年 | 20篇 |
2009年 | 29篇 |
2008年 | 15篇 |
2007年 | 16篇 |
2006年 | 33篇 |
2005年 | 10篇 |
2004年 | 11篇 |
2003年 | 17篇 |
2002年 | 8篇 |
2001年 | 9篇 |
2000年 | 7篇 |
1999年 | 8篇 |
1998年 | 30篇 |
1997年 | 50篇 |
1996年 | 45篇 |
1995年 | 33篇 |
1994年 | 33篇 |
1993年 | 36篇 |
1992年 | 18篇 |
1991年 | 8篇 |
1990年 | 12篇 |
1989年 | 13篇 |
1988年 | 17篇 |
1987年 | 9篇 |
1986年 | 6篇 |
1985年 | 8篇 |
1984年 | 9篇 |
1983年 | 11篇 |
1982年 | 16篇 |
1981年 | 14篇 |
1980年 | 8篇 |
1979年 | 5篇 |
1978年 | 4篇 |
1977年 | 6篇 |
1976年 | 15篇 |
1975年 | 9篇 |
1973年 | 1篇 |
1971年 | 1篇 |
排序方式: 共有706条查询结果,搜索用时 15 毫秒
31.
32.
33.
RICHARD LIVINGSTON RS VIRGINIA CRANE RN PA LEROY C. MIMS MD 《Journal of obstetric, gynecologic, and neonatal nursing : JOGNN / NAACOG》1977,6(6):7-10
There is disagreement among authors as to what criteria are most reliable in assessing postnatal fetal age. A comparison–for objectivity, accuracy, and frequency of use– of specific criteria was made using three independent examiners at different educational levels: a second-year medical student, a perinatal nurse practitioner, and a pediatrics resident. It was shown that trained examiners develop favorite criteria which differ among examiners and thus sacrifice accuracy; however, accurate assessment of fetal age can be accomplished by an examiner with minimum clinical knowledge. 相似文献
34.
35.
FRITZI KALLOP RN RS 《Journal of obstetric, gynecologic, and neonatal nursing : JOGNN / NAACOG》1973,2(3):36-41
The author believes that professional advice given the parents of a mongoloid infant determines their initial decision on institutionalization. Multidisciplinary counseling by the health team can help parents decide on a course of action that will prove satisfactory in the long run. Consultation should include health t e r n efforts to help parents work through the mourning process and presentation of a) an objective, comprehensive view of the child's condition, b) information on integrating a mongoloid into the family unit, and c) outside resources available to the parents. Deliberation with the parents to help them reach their own decision is essential. 相似文献
36.
37.
Background
The Rh blood system is one of the most polymorphic and immunogenic systems known to humans. The expression of Rh blood group antigen is complex. The Rh D antigen is the most important of the antigens that constitute the Rh antigen system. In most cases, D antigen can easily be detected. However, due to variability of expression, weak forms antigen are encountered. The reactivity of weak D with antisera is variable and presents as a problem in blood banking.Methods
A retrospective analysis for a five-year period was done. Blood samples that were negative for Rh D by immediate spin tube method were tested for weak D antigen by additional lab tests.Result
Of 34932 serial Rh grouping tests done in our Blood Bank, the incidence of weak D Rh antigen was 0.189%. All these were confirmed by the antiglobulin test.Conclusion
These patients present as a problem for the blood banker and a curiosity to the clinician. Although uncommon, all health care workers should be aware of this entity to avoid anti D alloimmunisation.Key Words: Weak D, Rh Blood Group 相似文献38.
39.
40.
Effects of fibroblast growth factor-4 (k-FGF) on long-term cultures of human bone marrow cells 总被引:1,自引:0,他引:1
Fibroblast growth factor-4 (FGF-4), a highly mitogenic protein encoded by the k-fgf/hst oncogene, stimulates the growth of a variety of cells of mesenchymal and neuroectodermal origin. Addition of FGF-4 to human long-term bone marrow cultures increased both the cell density of the stromal layer and the number of hematopoietic colony forming cells in the cultures in a dose-dependent manner. Hematopoiesis in the stromal layer persisted for up to 8 months. Erythropoiesis was maintained for up to 4 weeks, but granulocytes were the predominant nonadherent cell type. Cultures treated with FGF had increased numbers of monocytes compared with control cultures and some CD14+, CD45+ monocytes could still be detected after 8 months of continuous culture. The addition of the growth factor increased the rate of growth of the stromal layer and appeared to delay its senescence. Subcultures made in the presence of FGF-4 had up to 10-fold increases in plating efficiency and grew as relatively uniform monolayers. These subcultures retained the capacity to support hematopoiesis for several months, while untreated subcultures, made without FGF-4, grew erratically and generally lost the capacity to support hematopoiesis within 4 to 6 weeks. The improved growth after subculture greatly enhanced the reliability of limit- dilution assays of multipotential hematopoietic stem cells that use stromal cell monolayers. The primary effect of FGF-4 appeared to be on the stromal cells of the long-term bone marrow cultures, but a direct effect on hematopoietic progenitors could not be ruled out. 相似文献