全文获取类型
收费全文 | 2447篇 |
免费 | 126篇 |
国内免费 | 12篇 |
专业分类
耳鼻咽喉 | 25篇 |
儿科学 | 125篇 |
妇产科学 | 24篇 |
基础医学 | 241篇 |
口腔科学 | 53篇 |
临床医学 | 290篇 |
内科学 | 576篇 |
皮肤病学 | 26篇 |
神经病学 | 186篇 |
特种医学 | 329篇 |
外国民族医学 | 1篇 |
外科学 | 326篇 |
综合类 | 34篇 |
一般理论 | 1篇 |
预防医学 | 127篇 |
眼科学 | 19篇 |
药学 | 99篇 |
中国医学 | 7篇 |
肿瘤学 | 96篇 |
出版年
2021年 | 14篇 |
2020年 | 17篇 |
2019年 | 13篇 |
2018年 | 20篇 |
2017年 | 12篇 |
2016年 | 19篇 |
2015年 | 25篇 |
2014年 | 34篇 |
2013年 | 50篇 |
2012年 | 60篇 |
2011年 | 69篇 |
2010年 | 67篇 |
2009年 | 52篇 |
2008年 | 54篇 |
2007年 | 83篇 |
2006年 | 89篇 |
2005年 | 86篇 |
2004年 | 63篇 |
2003年 | 65篇 |
2002年 | 63篇 |
2001年 | 66篇 |
2000年 | 69篇 |
1999年 | 79篇 |
1998年 | 110篇 |
1997年 | 79篇 |
1996年 | 88篇 |
1995年 | 65篇 |
1994年 | 62篇 |
1993年 | 67篇 |
1992年 | 52篇 |
1991年 | 31篇 |
1990年 | 53篇 |
1989年 | 76篇 |
1988年 | 51篇 |
1987年 | 73篇 |
1986年 | 52篇 |
1985年 | 68篇 |
1984年 | 44篇 |
1983年 | 45篇 |
1982年 | 37篇 |
1981年 | 36篇 |
1980年 | 39篇 |
1979年 | 39篇 |
1978年 | 34篇 |
1977年 | 37篇 |
1976年 | 40篇 |
1975年 | 20篇 |
1974年 | 14篇 |
1973年 | 17篇 |
1971年 | 11篇 |
排序方式: 共有2585条查询结果,搜索用时 15 毫秒
1.
Needle-localized breast biopsy: why do we fail? 总被引:10,自引:0,他引:10
2.
Hernia of the inferior lumbar space. A cause of back pain 总被引:1,自引:0,他引:1
H G Light 《Archives of surgery (Chicago, Ill. : 1960)》1983,118(9):1077-1080
Twenty hernias of incarcerated fat at the inferior lumbar space were seen during a 23-year period. The usual complaint was a painful mass that caused a backache. The condition was more common in women and girls than in men (18 v two). The wider female pelvis creates a larger inferior lumbar space, which predisposes to the hernia. The hernia appears through a defect of the covering lumbodorsal fascia. Increased physical activity in young women seemed to be a causative factor. One patient had acute strangulation of incarcerated fat. Nineteen of the 20 hernias were treated with surgical excision and repair of the lumbodorsal fascial defect. Results of treatment were good. Though rare, hernias of the inferior lumbar space should be considered when back pain is present, particularly in a young, athletic woman. 相似文献
3.
4.
Diseases like rotavirus afflict both upper- and lower-income countries, but most serious illnesses and deaths occur among the latter. It is a vital public health issue that vaccines for these types of global diseases can recover research and development (R&D) costs from high-priced markets quickly so that manufacturers can offer affordable prices to lower-income nations. Cost recovery depends on how high R&D costs are, and this study attempts to replace high, unverified estimates with lower, more verifiable estimates for two new vaccines, RotaTeq (Merck) and Rotarix (GlaxoSmithKline or GSK), based on detailed searches of public information and follow-up interviews with senior informants. We also offer a new perspective on “cost of capital” as a claim for recovery from public bodies. Our estimates suggest that companies can recover all fixed costs quickly from affluent markets and thus can offer these vaccines to lower-income countries at prices they can afford. Better vaccines are a shared project between companies and public health agencies; greater transparency and consistency in reporting of R&D costs is needed so that fair prices can be established. 相似文献
5.
6.
Ketai LH; Williamson MR; Telepak RJ; Levy H; Koster FT; Nolte KB; Allen SE 《Radiology》1994,191(3):665
7.
Edwin H. Preston Jimmy A. Light Robert L. Kampen Allan D. Kirk 《American journal of transplantation》2004,4(2):283-285
Passenger leukocytes have been suggested to be both pro-tolerant and immunogenic. The opportunity to evaluate the role of allogeneic passenger leukocytes in humans was presented by a 47-year-old man who donated bone marrow to his HLA-identical leukemic sister. Eleven years later he developed renal failure. The sister's marrow was noted to be 100% XY karyotype and free of malignancy. She donated a kidney to her brother. Immunosuppression was tapered following transplantation. After 6 months, the recipient was on monotherapy sirolimus, 1 mg every third day. A surveillance biopsy was normal and sirolimus was stopped. Eight weeks later, he presented with severe rejection that reversed with Thymoglobulin. Renal function returned to baseline and has been stable on conventional immunosuppression. 相似文献
8.
9.
荧光原位杂交技术分析人结肠菌群方法研究 总被引:2,自引:0,他引:2
建立荧光原位杂交技术分析人体内结肠菌群的方法。取受试者新鲜粪便 ,选用 5种特异性的 16SrRNA寡核苷酸探针 ,检测粪便样本收集后的保存时间、温度 ,离心条件及样本固定液存放时间对杂交计数结果的影响。结果建立最佳实验条件为 :粪便样本收集后应尽快在 4℃下保存 ,放置时间不要超过 12小时即作处理 ;样本的适宜离心条件为 70 0g 2分钟 ;样本用多聚甲醛固定后在 - 80℃下存放时间不要超过 5个月。该方法具有较好的稳定性 ,可以有效地检出个体之间结肠菌群的差异。 相似文献
10.