全文获取类型
收费全文 | 388篇 |
免费 | 15篇 |
国内免费 | 4篇 |
专业分类
儿科学 | 11篇 |
妇产科学 | 3篇 |
基础医学 | 16篇 |
口腔科学 | 13篇 |
临床医学 | 31篇 |
内科学 | 69篇 |
皮肤病学 | 2篇 |
神经病学 | 3篇 |
特种医学 | 94篇 |
外科学 | 24篇 |
综合类 | 20篇 |
预防医学 | 32篇 |
眼科学 | 2篇 |
药学 | 13篇 |
肿瘤学 | 74篇 |
出版年
2024年 | 2篇 |
2022年 | 4篇 |
2021年 | 7篇 |
2020年 | 9篇 |
2019年 | 9篇 |
2018年 | 8篇 |
2017年 | 5篇 |
2016年 | 6篇 |
2015年 | 12篇 |
2014年 | 6篇 |
2013年 | 21篇 |
2012年 | 17篇 |
2011年 | 9篇 |
2010年 | 18篇 |
2009年 | 10篇 |
2008年 | 15篇 |
2007年 | 13篇 |
2006年 | 8篇 |
2005年 | 8篇 |
2004年 | 10篇 |
2003年 | 6篇 |
2002年 | 2篇 |
2001年 | 3篇 |
2000年 | 7篇 |
1999年 | 7篇 |
1998年 | 18篇 |
1997年 | 20篇 |
1996年 | 17篇 |
1995年 | 12篇 |
1994年 | 14篇 |
1993年 | 9篇 |
1991年 | 4篇 |
1990年 | 6篇 |
1989年 | 11篇 |
1988年 | 5篇 |
1987年 | 4篇 |
1986年 | 7篇 |
1985年 | 5篇 |
1984年 | 6篇 |
1982年 | 3篇 |
1981年 | 5篇 |
1980年 | 8篇 |
1978年 | 5篇 |
1977年 | 5篇 |
1976年 | 3篇 |
1975年 | 4篇 |
1958年 | 2篇 |
1954年 | 2篇 |
1953年 | 2篇 |
1952年 | 1篇 |
排序方式: 共有407条查询结果,搜索用时 14 毫秒
81.
Evaluating community health worker performance in India 总被引:1,自引:0,他引:1
BHATTACHARJI SARA; ABRAHAM SULOCHANA; MULIYIL JAYAPRAKASH; JOB JAYAKARAN S; JOHN KR; JOSEPH ABRAHAM 《Health policy and planning》1986,1(3):232-239
In 1977 the Government of India launched a health care experimentin which volunteers were used to provide a basic health careservice. Community health workers have also been used in manysmall, non-governmental programmes. Although much has been saidabout the selection and training of such workers, there havebeen very few attempts to evaluate their actual work performance.This paper makes the plea for more, regular evaluations of theiractivities by those involved in the programmes: communities,supervisors and health workers themselves. Such evaluationsare useful even if they are only done on a small scale. Whatis described here is a small study of the performance of part-timecommunity health workers (PTCHWs) in a programmme initiatedin 1977 by the Community Health Department of the ChristianMedical College in Vellore, South India. It concludes that thePTCHWs with the highest performance scores have, on the whole,less education, more experience, less population to cover andmore intense supervision. 相似文献
82.
83.
Developmental biology of the dendritic cell system 总被引:1,自引:0,他引:1
Aim : To determine whether an imbalance of dendritic cell subsets might contribute to diminished adaptive host responses observed in newborn infants. It was hypothesized that the proportion of lymphoid dendritic cells would be greater than that of myeloid dendritic cells in cord blood. Methods : To investigate this, dendritic cell subsets were evaluated in whole cord blood by flow cytometry. Circulating dendritic cells were also isolated from cord blood based on CD1c and BDCA-2 expression. Myeloid dendritic cells were also obtained by culturing cord and adult blood monocytes. Surface phenotypes of these cells were determined by flow cytometry using monoclonal antibodies directed against lineage, major histocompatibility, adhesion, co-stimulation and cytokine receptor molecules. Antigen-presenting functions of dendritic cell subsets were determined by mixed leukocyte reactions. Results : Circulating myeloid dendritic cells were higher in cord blood than previously reported in adult blood, whereas lymphoid dendritic cell numbers were similar between cord and adult blood. Expression of CD11c, CD45RA and CD45RO did not accurately differentiate between dendritic cell subsets circulating in cord blood. Fresh and culture-derived cord blood myeloid dendritic cells stimulated adult allogeneic leukocyte proliferation, while lymphoid dendritic cells were less effective inducers of an adult allogeneic leukocyte response. Culture-derived dendritic cells induced modest autologous cord blood leukocyte proliferation, but freshly isolated myeloid and lymphoid dendritic cells did not stimulated autologous leukocytes.
Conclusion : Contrary to the hypothesis, an imbalance in the ratio of circulating myeloid to lymphoid dendritic cell subsets does not exist and, therefore, does not contribute to diminished adaptive immune responses in newborn infants. 相似文献
Conclusion : Contrary to the hypothesis, an imbalance in the ratio of circulating myeloid to lymphoid dendritic cell subsets does not exist and, therefore, does not contribute to diminished adaptive immune responses in newborn infants. 相似文献
84.
The objective of this study was to determine the effects of patient-based mammography screening strategies. We performed a meta-analysis and included United States studies that met the following criteria: (a) randomized or concurrent control design; (b) defined outcomes; and (c) data available for reanalysis. Interventions were classified as behavioral, cognitive, or sociological and further categorized by the type of control group (active versus usual care), number of interventions, and mode of intervention (interactive versus static). Data were combined using DerSimonian and Laird random effects models to yield summary effect sizes. A total of 63 interventions in 43 studies met the inclusion criteria. Behavioral interventions increased screening by 13.2% [95% confidence interval (CI), 4.7-21.2] compared with usual care, and by 13.0% (95% CI, 8.7-17.4) when using multiple strategies and 5.6% (95% CI, 0.6-10.6) when using a single intervention compared to active controls. Cognitive interventions using generic education strategies had little impact on screening, but those that used theory-based education (e.g., health belief model) increased rates by 23.6% (95% CI, 16.4-30.1) compared with usual care. Sociological interventions also increased screening rates. Interventions using a theoretical framework were the most effective in increasing screening rates. The ability of these interventions to increase screening among subgroups and improve rates of ongoing screening, as well as the costs of these strategies, is unknown and is an important area for future research. 相似文献
85.
86.
Acute flank pain: comparison of non-contrast-enhanced CT and intravenous urography 总被引:24,自引:2,他引:24
Smith RC; Rosenfield AT; Choe KA; Essenmacher KR; Verga M; Glickman MG; Lange RC 《Radiology》1995,194(3):789
87.
DD Suh CC Yang Y Cao JR Heiman PA Garland KR Maravilla 《Journal of psychosomatic obstetrics and gynaecology》2013,34(2):153-162
We utilized contrast enhanced magnetic resonance imaging (MRI) to delineate the anatomy of the female genital and pelvic organs during sexual arousal. Eleven healthy pre-menopausal women and eight healthy post-menopausal women underwent MRI of the pelvis while watching an erotic video. A 1.5 Tesla MR system was used to produce T1-weighted images following administration of MS-325, a gadolinium-based blood pool contrast agent. Selected structural dimensions and enhancement were measured prior to and during sexual arousal. In both pre- and post-menopausal subjects, vestibular bulb and labia minora width increased with arousal. Enhancement measurements increased in the bulb, labia minora and clitoris in both pre- and post-menopausal subjects, and in the vagina in pre-menopausal subjects. There were no marked changes in size or enhancement of the labia majora, urethra, cervix, or rectum during sexual arousal in pre- or post-menopausal subjects. Using MRI, we observed specific changes in the female genitalia and pelvic organs with sexual arousal, in both pre- and post-menopausal women. MRI can potentially provide detailed anatomical information in the assessment of female sexual function, particularly with regard to changes in blood flow. 相似文献
88.
89.
90.
用(+)-FLEC手性试剂自动柱前衍生高效液相色谱法拆分麻黄碱类药物对映体 总被引:5,自引:0,他引:5
报道了以(+)-FLEC作为手性衍生化试剂,用反相高效液相色谱技术分离麻黄碱类药物对映异构体的方法。dl-麻黄碱、dl-伪麻黄碱、dl-去甲麻黄碱、dl-去甲伪麻黄碱先与(+)-FLEC形成衍生物后,经过一ODSHypersil柱分离,以水和乙腈为流动相梯度洗脱.二极管阵列检测器在266nm检测。该法从样品衍生化到最终报告全部自动完成。上述各对对映体均达到基线分离,分离度R均大于1.5,方法灵敏度高,最低检出限达10pmo1,保留时间和峰面积的上现性较好,RSD分别为1.1/和3.0%。 相似文献