全文获取类型
收费全文 | 12106篇 |
免费 | 521篇 |
国内免费 | 455篇 |
专业分类
耳鼻咽喉 | 20篇 |
儿科学 | 362篇 |
妇产科学 | 1885篇 |
基础医学 | 865篇 |
口腔科学 | 194篇 |
临床医学 | 1048篇 |
内科学 | 2146篇 |
皮肤病学 | 133篇 |
神经病学 | 526篇 |
特种医学 | 545篇 |
外科学 | 1059篇 |
综合类 | 1869篇 |
现状与发展 | 1篇 |
一般理论 | 2篇 |
预防医学 | 1000篇 |
眼科学 | 215篇 |
药学 | 438篇 |
中国医学 | 196篇 |
肿瘤学 | 578篇 |
出版年
2023年 | 70篇 |
2022年 | 80篇 |
2021年 | 106篇 |
2020年 | 80篇 |
2018年 | 145篇 |
2017年 | 122篇 |
2016年 | 146篇 |
2015年 | 123篇 |
2014年 | 173篇 |
2013年 | 196篇 |
2012年 | 518篇 |
2011年 | 800篇 |
2010年 | 280篇 |
2009年 | 261篇 |
2008年 | 495篇 |
2007年 | 484篇 |
2006年 | 445篇 |
2005年 | 509篇 |
2004年 | 843篇 |
2003年 | 901篇 |
2002年 | 605篇 |
2001年 | 512篇 |
2000年 | 243篇 |
1999年 | 355篇 |
1998年 | 337篇 |
1997年 | 351篇 |
1996年 | 303篇 |
1995年 | 253篇 |
1994年 | 293篇 |
1993年 | 294篇 |
1992年 | 327篇 |
1991年 | 316篇 |
1990年 | 302篇 |
1989年 | 260篇 |
1988年 | 191篇 |
1987年 | 200篇 |
1986年 | 161篇 |
1985年 | 118篇 |
1984年 | 75篇 |
1983年 | 71篇 |
1982年 | 68篇 |
1981年 | 67篇 |
1980年 | 56篇 |
1979年 | 54篇 |
1978年 | 38篇 |
1977年 | 45篇 |
1976年 | 36篇 |
1975年 | 49篇 |
1973年 | 51篇 |
1970年 | 29篇 |
排序方式: 共有10000条查询结果,搜索用时 0 毫秒
31.
将医用缝合线浸泡在质粒DNA溶液中,然后缝合在大鼠股四头肌上,可以观察到外源基因在肌肉组织中高效、稳定地表达,其表达量高于磷酸钙共沉淀和DNA沉淀块埋植法,较肌肉直接注射法表达量高10倍左右。 相似文献
32.
Effect of environment on extremely severe road traffic crashes:retrospective epidemic analysis during 2000-2001 总被引:1,自引:0,他引:1
Objective: To make an epidemiological analysis of the effect of environment on extremely severe road traffic crashes (RTCs). Methods: Epidemiologic data of extremely severe RTCs associated with environmental factors, including weather, topography, road conditions and other traffic conditions in Mainland China during 2000-2001, were collected and analyzed. Results: ( 1 ) During 2000-2001, there were 3 365 extremely severe RTCs with 13 666 deaths, 12 204 injuries and a direct economical loss of 136 million RMB. ( 2 ) Most extremely severe RTCs occurred in fine weather days and in the daytime. The high occurrence sites were plain areas, horizontal and straight roads, Grade B and C roads, ordinary road segment, and asphalt, smooth and mixed roads. (3) Compared with other RTCs, extremely severe RTCs were more likely to happen under following conditions: on cloudy, snowing, misty and blustering days; in hill and mountainous areas; on crooked and sloping roads; on freeway, Grade A, B, and C roads; mixed roads; ordinary, bridge, narrow and transitional roads; sand and dirt-roads; without traffic control measures; night without lighting. (4) Extremely severe RTCs of mountainous area or crooked and sloping roads were most severe in terms of deaths and injures per crash. Conclusions: Extremely severe RTCs are closely related with environmental factors. Rational road programming, enhancing road establishment and improving road conditions are probably effective measures to reduce the road traffic injuries. 相似文献
33.
John McMahon RMN BA Scottish Home Health Department Nursing Research Fellow Staff Nurse Barry T Jones BSc PhD Senior Lecturer 《Journal of advanced nursing》1992,17(2):173-186
Despite being constantly cited as a critical intervening variable in the recovery from alcohol problems, there is a paucity of literature on client motivation. This paper reviews the current literature which impacts on motivation and its importance in treatment and develops in a stepwise manner the revised expectancy/motivation hypothesis, tentatively explaining both motivation and denial as a natural process in behavioural change. Because of the revised expectancy/motivation hypothesis' distinctly defined stages which closely relate to the process of nursing and the qualitative and quantitative measurement it entails which the nursing process demands, it offers a particularly appropriate model for treatment within nurse practice. 相似文献
34.
本文报道蛇毒溶栓素对实验动物血小板功能和血浆环腺苷酸含量的影响.(1)对血小板数的影响:给家犬以4 u/kg量静注1小时后,循环血的血小板数由药前130.44×10~9/L±50.02×10~9/L下降至60.20×10~9/L±20.50×10~9/L(P<0.05).(2)对血小板聚集功能的影响:猕猴和家兔分别按4 u/kg、8 u/kg量静注1小时后,对ADP诱导的血小板聚集率分别山药前的62.32±22.05%和43.66±10.60%下降至1.32±0.49%和4.95±1.96%;抑制率分别为97.50±1.75%和88.34±4.31%,与药前组相比均有非常显著的差异(P<0.001).(3)对血小板cAMP含量的影响:猕猴和家兔以蛋白竞争结合法测定血小板内cAMP的含量,药后1小时的含量65.43±31.35pmole/mg,32.25±15.43pmo1e/mg蛋白质,与药前12.02±0.95pmole/mg,4.25±3.13pmole/mg蛋白质相比有明显升高(P<0.001). 相似文献
35.
本文采用新型无机絮凝剂FOLY A-F联合木炭柱处理针织厂印染废水取得较为满意的效果。废水CODCr含量的波动范围为161.8~483.6ppm;固体悬浮物95.5~442ppm;pH8.4~11.6。经本方法处理后,溶液基本上无色透明,固体悬浮物近于0,CODCr含量少于100ppm,CODCr去除率为77.9%。以上四项检测指标均达到国家规定的排放标准。适用于处理中、小型针织厂的废水。 相似文献
36.
作者对核糖体现有的制备方法进行了部分改进,从黄疸出血群赖型017株钩体中成功地制备了核糖体提取物。该提取物经SPA-ELISA 证实具有免疫原性,对40只受试豚鼠的保护试验结果表明,核糖体提取物对同型毒株的攻击具有明显的保护作用;结果还证明核糖体提取物能诱导机体的体液免疫反应。 相似文献
37.
38.
Andrea Frudinger Research Registrar Clive I. Bartram Consultant John A. D. Spencer Consultant Michael A. Kamm Consultant 《BJOG : an international journal of obstetrics and gynaecology》1997,104(9):1009-1013
Objective To assess the relation between perineal inspection and sphincter integrity in parous women.
Design Prospective observational study.
Setting District general hospital.
Population Fifty-seven consecutive parous women attending a gynaecology clinic for problems unrelated to the pelvic floor.
Methods A detailed history of bowel function and mode of delivery obtained; the perineum inspected to determine the presence and position of scarring, and anal endosonography performed.
Results In 19 women with an intact perineum on inspection, endosonography showed perineal scarring in five, with both perineal and sphincter scarring in three. Four had urge faecal incontinence. Three patients had a perineal tear only on inspection, but this group was too small for analysis and was discounted. Nine had an episiotomy scar only. Endosonography demonstrated perineal scarring in four, and combined perineal and sphincter scarring in two; one woman in this group had urge faecal incontinence. Twenty-six women had episiotomy and perineal tears on inspection. Endosonography revealed underlying perineal scarring in five women, with combined perineal and sphincter scarring in 14; six women in this group had urge faecal incontinence and one passive incontinence for flatus. Sonographically the scarring was anterior and circumferential rather than radial, and mostly left-sided, whereas on inspection episiotomy and perineal scarring were right sided.
Conclusions A normal perineum on clinical examination does not exclude underlying sphincter damage. The incidence of sphincter damage increases significantly when an episiotomy scar is associated with a perineal tear. 相似文献
Design Prospective observational study.
Setting District general hospital.
Population Fifty-seven consecutive parous women attending a gynaecology clinic for problems unrelated to the pelvic floor.
Methods A detailed history of bowel function and mode of delivery obtained; the perineum inspected to determine the presence and position of scarring, and anal endosonography performed.
Results In 19 women with an intact perineum on inspection, endosonography showed perineal scarring in five, with both perineal and sphincter scarring in three. Four had urge faecal incontinence. Three patients had a perineal tear only on inspection, but this group was too small for analysis and was discounted. Nine had an episiotomy scar only. Endosonography demonstrated perineal scarring in four, and combined perineal and sphincter scarring in two; one woman in this group had urge faecal incontinence. Twenty-six women had episiotomy and perineal tears on inspection. Endosonography revealed underlying perineal scarring in five women, with combined perineal and sphincter scarring in 14; six women in this group had urge faecal incontinence and one passive incontinence for flatus. Sonographically the scarring was anterior and circumferential rather than radial, and mostly left-sided, whereas on inspection episiotomy and perineal scarring were right sided.
Conclusions A normal perineum on clinical examination does not exclude underlying sphincter damage. The incidence of sphincter damage increases significantly when an episiotomy scar is associated with a perineal tear. 相似文献
39.
血清TPS浓度在消化道肿瘤中价值的研究 总被引:4,自引:0,他引:4
共选择30例消化道肿瘤病人,其中食管癌,胃癌,大肠癌各10例,设健康献血者30例,对两组血清特异型组织多肽抗原浓度进行了检测,结果肿瘤组血清TPS浓度明显高于健康人。消化道肿瘤阳性检出经达70%,其中食管癌80%,胃癌60%,大肠癌70%。消化道肿瘤合并淋巴转移阳性检出率达76.9%,其中食管癌100%,胃癌66.7%,大肠癌70.0%。随着病程发展,血清TPS浓度呈现升高趋势。 相似文献
40.
Terry Kwong MB BS FRACP Senior Fellow Elsa Valderrama MD Assistant Professor of Pediatric Pathology Carole Paley MD Assistant Professor of Pediatrics Norman Ilowite MD Associate Professor of Pediatrics 《Seminars in arthritis and rheumatism》1994,23(6)
Childhood sarcoidosis is a rare disorder with protean manifestations. The case of a child with prolonged fever, hepatosplenomegaly, pancytopenia, and systemic necrotizing vasculitis manifesting as fever, rash and skin infarctions, digital pregangrene, and foot drop is reported. This is the first case of systemic necrotizing vasculitis reported in sarcoidosis. The fulminant course of the disease required treatment with intravenous pulsed cyclophosphamide and high doses of corticosteroids. The spectrum of vasculitis in childhood and adult sarcoidosis is reviewed. 相似文献