全文获取类型
收费全文 | 1613篇 |
免费 | 97篇 |
国内免费 | 42篇 |
专业分类
耳鼻咽喉 | 5篇 |
儿科学 | 66篇 |
妇产科学 | 18篇 |
基础医学 | 179篇 |
口腔科学 | 165篇 |
临床医学 | 144篇 |
内科学 | 401篇 |
皮肤病学 | 22篇 |
神经病学 | 83篇 |
特种医学 | 295篇 |
外科学 | 150篇 |
综合类 | 29篇 |
预防医学 | 76篇 |
眼科学 | 6篇 |
药学 | 45篇 |
中国医学 | 3篇 |
肿瘤学 | 65篇 |
出版年
2019年 | 10篇 |
2018年 | 15篇 |
2017年 | 12篇 |
2016年 | 13篇 |
2015年 | 29篇 |
2014年 | 30篇 |
2013年 | 30篇 |
2012年 | 30篇 |
2011年 | 47篇 |
2010年 | 24篇 |
2009年 | 28篇 |
2008年 | 46篇 |
2007年 | 80篇 |
2006年 | 44篇 |
2005年 | 49篇 |
2004年 | 34篇 |
2003年 | 37篇 |
2002年 | 35篇 |
2001年 | 37篇 |
2000年 | 36篇 |
1999年 | 37篇 |
1998年 | 48篇 |
1997年 | 49篇 |
1996年 | 51篇 |
1995年 | 42篇 |
1994年 | 59篇 |
1993年 | 39篇 |
1992年 | 41篇 |
1991年 | 43篇 |
1990年 | 33篇 |
1989年 | 65篇 |
1988年 | 64篇 |
1987年 | 71篇 |
1986年 | 58篇 |
1985年 | 64篇 |
1984年 | 32篇 |
1983年 | 27篇 |
1982年 | 26篇 |
1981年 | 21篇 |
1980年 | 23篇 |
1979年 | 26篇 |
1978年 | 16篇 |
1977年 | 15篇 |
1976年 | 12篇 |
1974年 | 18篇 |
1973年 | 9篇 |
1972年 | 11篇 |
1970年 | 15篇 |
1968年 | 8篇 |
1967年 | 9篇 |
排序方式: 共有1752条查询结果,搜索用时 31 毫秒
1.
2.
3.
SUMMARY A case congenital dislocation of both knees and dislocation of the left hip in an infant whose mother had a chronic amniotic fluid leakage after mid-trimester amniocentesis. 相似文献
4.
D A Pegues C M Beck-Sague S W Woollen B Greenspan S M Burns L A Bland M J Arduino M S Favero R C Mackow W R Jarvis 《Kidney international》1992,42(5):1232-1237
From July 18 through November 27, 1989, 12 anaphylactoid reactions (ARs) occurred in 10 patients at a hemodialysis center in Virginia. One patient required hospitalization; no patients died. ARs occurred within minutes of initiating dialysis and were characterized by peripheral numbness and tingling, laryngeal edema or angioedema, facial or generalized sensation of warmth, and/or nausea or vomiting. All 12 ARs occurred with dialyzers that had been reprocessed with an automated reprocessing system. A cohort study, including all patients undergoing dialysis sessions on the six days when an AR occurred, showed that the patients who experienced ARs were significantly more likely than patients who did not to be treated with angiotensin-converting enzyme (ACE) inhibitors (7/10 vs. 3/33; relative risk = 7.9; 95% confidence interval = 2.5 to 25.2) and to have been exposed to reused dialyzers rather than to new dialyzers (12/70 sessions vs. 0/31; P = 0.016). In those sessions using a reused dialyzer, the mean number of dialyzer uses in case-sessions was significantly higher than for noncase-sessions (10.3 vs. 6.2; P = 0.016). After reuse of dialyzers was discontinued at the center, no further ARs occurred, despite the continued administration of ACE inhibitors. This is the first report of an outbreak of ARs associated exclusively with reused dialyzers. We hypothesize that interactions between a dialyzer that has been repeatedly reprocessed and reused, blood, and additional factors, such as ACE inhibitors, increased the risk of developing ARs. 相似文献
5.
6.
7.
The Ca antigen has been reported to be present on the surface of malignant but not, with few exceptions, non-malignant cells. We investigated the potential usefulness of the monoclonal Ca 1 antibody in differentiating oral squamous cell carcinoma from non-malignant or premalignant oral neoplasms. Paraffin-embedded sections from 33 biopsy specimens of 12 hyperplastic and 21 neoplastic oral lesions were examined by immunohistochemical staining. Seven of the 33 specimens showed positive staining for Ca antigen. Fifteen of 21 specimens of oral squamous cell carcinoma were negative for Ca antigen, and one case of focal keratosis was positive. The results indicate that the use of the Ca 1 antibody to distinguish oral squamous cell carcinoma from non-malignant or premalignant oral lesions is highly unreliable. 相似文献
8.
高效液相色谱法测定右旋儿茶素血浆浓度及药代动力学参数 总被引:1,自引:0,他引:1
本文建立了体液中右旋儿茶素的RP-HPLC测定方法。采用C_(18)键合相硅胶为填料的固相提取柱进行样品预处理,右旋儿茶素的提取回收率为79.8%.应用二极管阵列检测器对色谱峰纯度进行鉴定。该法精密度好,方法回收率近100%,日内、日间的变异系数为2.4~5.6%,血浓69.6~1160 ng/ml范围内呈线性关系,r=0.9993。家兔静注右旋儿茶素18mg/kg,其药代动力学过程符合二室模型,分布相半衰期为0.129 h,消除相半衰期为1.19h。 相似文献
9.
10.
D A Present S F Bonar A Greenspan K Paonessa 《Clinical orthopaedics and related research》1988,(237):164-169
A case of clear-cell chondrosarcoma occurred in the proximal femur of a 32-year-old man. The tumor was complicated by a focus of myositis ossificans resulting from a previous intralesional biopsy. Histologic findings included an unusual marrow infiltration by the tumor. The patient was treated with wide resection and has no evidence of local recurrence or distant spread of disease 18 months later. 相似文献