全文获取类型
收费全文 | 1069篇 |
免费 | 89篇 |
国内免费 | 19篇 |
专业分类
儿科学 | 86篇 |
妇产科学 | 4篇 |
基础医学 | 131篇 |
口腔科学 | 63篇 |
临床医学 | 119篇 |
内科学 | 180篇 |
皮肤病学 | 61篇 |
神经病学 | 30篇 |
特种医学 | 241篇 |
外科学 | 79篇 |
综合类 | 29篇 |
预防医学 | 48篇 |
眼科学 | 13篇 |
药学 | 30篇 |
1篇 | |
肿瘤学 | 62篇 |
出版年
2023年 | 5篇 |
2022年 | 3篇 |
2021年 | 5篇 |
2020年 | 10篇 |
2019年 | 8篇 |
2018年 | 16篇 |
2017年 | 8篇 |
2016年 | 14篇 |
2015年 | 27篇 |
2014年 | 24篇 |
2013年 | 41篇 |
2012年 | 25篇 |
2011年 | 21篇 |
2010年 | 54篇 |
2009年 | 53篇 |
2008年 | 25篇 |
2007年 | 36篇 |
2006年 | 27篇 |
2005年 | 26篇 |
2004年 | 16篇 |
2003年 | 29篇 |
2002年 | 20篇 |
2001年 | 15篇 |
2000年 | 5篇 |
1999年 | 22篇 |
1998年 | 81篇 |
1997年 | 76篇 |
1996年 | 59篇 |
1995年 | 52篇 |
1994年 | 37篇 |
1993年 | 45篇 |
1992年 | 7篇 |
1991年 | 23篇 |
1990年 | 14篇 |
1989年 | 42篇 |
1988年 | 35篇 |
1987年 | 25篇 |
1986年 | 18篇 |
1985年 | 18篇 |
1984年 | 9篇 |
1983年 | 12篇 |
1982年 | 14篇 |
1981年 | 14篇 |
1980年 | 15篇 |
1979年 | 3篇 |
1978年 | 13篇 |
1977年 | 11篇 |
1976年 | 10篇 |
1975年 | 8篇 |
1954年 | 1篇 |
排序方式: 共有1177条查询结果,搜索用时 15 毫秒
71.
Perforated colorectal neoplasms: correlation of clinical, contrast enema, and CT examinations 总被引:2,自引:0,他引:2
Hulnick DH; Megibow AJ; Balthazar EJ; Gordon RB; Surapenini R; Bosniak MA 《Radiology》1987,164(3):611-615
Results of clinical, contrast enema (CE), and computed tomographic (CT) examinations in 39 patients with perforated colorectal neoplasms were retrospectively reviewed. Twenty patients were toxemic at initial presentation, but in only four patients was the diagnosis of perforated colorectal neoplasm initially suspected clinically. CE study was performed in 22 patients and enabled the diagnosis of perforated neoplasm in 11 cases, neoplasm alone in eight, and neither neoplasm nor perforation in three. CT was performed in 38 patients and enabled the diagnosis of perforated neoplasm in 36; pericolic phlegmon but no mass lesion was evident in two. In 16 patients, CT also demonstrated metastatic disease. Because of its reliability in establishing the diagnosis and staging the extent of the inflammatory and neoplastic disease, CT is indicated in cases of suspected or proved perforated colorectal neoplasm and in cases in which CE study findings are indeterminate or suggestive of perforated neoplasm. 相似文献
72.
目的 探讨整合素在体外培养的椎间盘细胞力学传导中的作用。方法采用猪的椎间盘进行体外细胞的分离和培养,对细胞施加周期性液压负荷,通过对细胞的形态学观察、Western免疫印迹、免疫细胞化学染色和免疫荧光,分别检测整合素α3和肌动蛋白在周期性压力下椎间盘细胞中的表达。结果经加压后,纤维环细胞和髓核细胞均可见体积缩小,由多角形转变为细长形,α3和肌动蛋白在AF和NP细胞中的表达均明显减少。结论压力抑制了整合素α3的产生,整合素α3将力的信号转换到细胞内时,进一步影响到与其关系密切的肌动蛋白。 相似文献
73.
We performed a randomized doubled-blind study to evaluate whether there was a benefit in delay in tourniquet deflation with intra-articular administration of morphine and bupivacaine following operative arthroscopic surgery. In 34 patients the tourniquet was deflated immediately and in 38 patients the tourniquet remained inflated for 10 min following injection. The analgesic efficacy was assessed using pain scores and the amount of supplementary analgesia required. The results demonstrate no benefit in delay in tourniquet deflation. 相似文献
74.
Marrow graft failure observed in association with histocompatibility differences between donor and recipient is often attributed to rejection mediated by host-derived cytolytic T lymphocytes. The data presented in this report indicate that persistent host antibodies specific for donor antigen may also mediate graft failure, either by antibody-dependent cell-mediated cytotoxicity (ADCC), or complement- mediated cytotoxicity. In the case of HLA Class I disparity, where all donor cells express the target antigen, the presence of alpha-donor antibody was associated with complete graft failure and death. In the case of ABO blood group antigen disparity, the presence of alpha-donor antibody resulted in erythroid hypoplasia. The latter cases proved informative insofar as they established that host antibodies could persist for more than 18 months after chemoradiotherapy and impair marrow function. 相似文献
75.
76.
AJ Phillips 《Clinical & experimental optometry》1989,72(2):32-34
A patient with severe ocular albinism was fitted with a prosthetic soft contact lens which improved both photophobic symptoms and facial cosmesis. 相似文献
77.
78.
79.
Anxiety in patients undergoing MR imaging 总被引:6,自引:0,他引:6
To determine and quantify the major sources of anxiety for patients undergoing magnetic resonance (MR) imaging and to suggest means by which to eliminate or diminish their negative effects, the authors studied anxiety in 46 subjects. Of these, 20 randomly selected subjects who successfully completed the examination participated in exit interviews. Six subjects who terminated the examination before completion also completed exit interviews. Pre-imaging and postimaging questionnaires (state-trait anxiety inventory) were administered to measure anxiety in the 20 other subjects. Anxiety was associated with the constrictive dimensions of the magnet bore, examination duration, coil noise, and temperature within the bore. Preparation at the point of referral was consistently absent, incomplete, or misleading. Patients used identifiable strategies to cope with the examination: blinding, breathing relaxation techniques, visualization of pleasant images, and performance of mental exercises. 相似文献
80.
Di Chiro G; Girton ME; Frank JA; Dietz MJ; Gansow OA; Wright DC; Dwyer AJ 《Radiology》1986,160(1):221-222
Canine cerebrospinal fluid rhinorrhea, which occurs frequently in purebred beagles, was demonstrated in two dogs on magnetic resonance images after cisternal introduction of gadolinium-DTPA dimeglumine. 相似文献