全文获取类型
收费全文 | 2612篇 |
免费 | 202篇 |
国内免费 | 26篇 |
专业分类
耳鼻咽喉 | 1篇 |
儿科学 | 187篇 |
妇产科学 | 54篇 |
基础医学 | 324篇 |
口腔科学 | 80篇 |
临床医学 | 222篇 |
内科学 | 492篇 |
皮肤病学 | 56篇 |
神经病学 | 114篇 |
特种医学 | 387篇 |
外科学 | 223篇 |
综合类 | 86篇 |
预防医学 | 195篇 |
眼科学 | 44篇 |
药学 | 193篇 |
1篇 | |
中国医学 | 1篇 |
肿瘤学 | 180篇 |
出版年
2022年 | 8篇 |
2021年 | 32篇 |
2020年 | 20篇 |
2019年 | 26篇 |
2018年 | 53篇 |
2017年 | 42篇 |
2016年 | 39篇 |
2015年 | 58篇 |
2014年 | 58篇 |
2013年 | 87篇 |
2012年 | 74篇 |
2011年 | 87篇 |
2010年 | 91篇 |
2009年 | 110篇 |
2008年 | 81篇 |
2007年 | 94篇 |
2006年 | 88篇 |
2005年 | 82篇 |
2004年 | 61篇 |
2003年 | 57篇 |
2002年 | 63篇 |
2001年 | 55篇 |
2000年 | 51篇 |
1999年 | 58篇 |
1998年 | 115篇 |
1997年 | 126篇 |
1996年 | 123篇 |
1995年 | 89篇 |
1994年 | 94篇 |
1993年 | 109篇 |
1992年 | 53篇 |
1991年 | 39篇 |
1990年 | 36篇 |
1989年 | 58篇 |
1988年 | 60篇 |
1987年 | 40篇 |
1986年 | 46篇 |
1985年 | 48篇 |
1984年 | 32篇 |
1983年 | 26篇 |
1982年 | 30篇 |
1981年 | 36篇 |
1980年 | 28篇 |
1979年 | 17篇 |
1978年 | 14篇 |
1977年 | 31篇 |
1976年 | 31篇 |
1975年 | 13篇 |
1973年 | 11篇 |
1966年 | 7篇 |
排序方式: 共有2840条查询结果,搜索用时 46 毫秒
11.
12.
Granulocytic sarcoma (chloroma), a rare tumor usually associated with myelogenous leukemia, is capable of invading the meninges or brain parenchyma. Radiologic findings in a case of granulocytic sarcoma of the brain, as well as those in 11 previously reported cases of intracranial leukemic masses, are interpreted. On computed tomographic scans, the lesions can appear isodense or hyperdense, edema and necrosis are variable, and there is uniform enhancement following intravenous administration of contrast material. There may be some affinity for the posterior fossa. 相似文献
13.
14.
Experimental columnar metaplasia in the canine oesophagus 总被引:7,自引:0,他引:7
P Gillen P Keeling P J Byrne A B West T P Hennessy 《The British journal of surgery》1988,75(2):113-115
Regeneration of canine oesophageal mucosa was studied under basal conditions and in the presence of gastro-oesophageal reflux. In normal circumstances mucosal defects in the oesophagus regenerate by squamous epithelium. In the presence of gastro-oesophageal reflux of either acid or a combination of acid and bile, regeneration was frequently by columnar epithelium (Barrett's oesophagus). This columnar regeneration was not seen with bile reflux alone. By the use of squamous barriers to proximal migration of columnar epithelium in the stomach, it was demonstrated that columnar re-epithelialization may occur from cells intrinsic to the oesophagus and is not dependent on proximal migration of cardiac columnar epithelium. The cell of origin of this epithelium may be located in oesophageal gland ducts and is likely to be a multipotential stem cell since the regenerated columnar epithelium may contain goblet and parietal cells not normally found in the oesophagus. This epithelium is morphologically distinct on mucin histochemistry from cardiac columnar epithelium. These findings support the concept that Barrett's epithelium is metaplastic. 相似文献
15.
16.
A comprehensive anatomic and radiographic analysis of the peribursal fat plane in 12 cadavers confirmed that the fat plane seen on radiographs represents extrasynovial fat lining the subacromial bursa and documented the anatomic relations of the bursa. A three-part retrospective clinical evaluation of rotator cuff tears, calcific tendinitis, and rheumatoid arthritis was performed. Two osteoradiologists blindly graded the appearance of the peribursal fat plane with the shoulder in external versus internal rotation in 21 patients with arthrographically intact rotator cuffs and 21 patients with disrupted rotator cuffs. The peribursal fat plane was seen better with disrupted rotator cuffs. The peribursal fat plane was seen better with the shoulder in internal rotation and was seen in 60% of control subjects but only 21% of patients with rotator cuff tears. Partial or complete obliteration of this fat plane is a sensitive (79%) but less specific (60%) indicator of rotator cuff tears. Obliteration of the peribursal fat plane by inflammatory processes in adjacent tissues, including calcific tendinitis and rheumatoid arthritis, occurred with a high frequency. 相似文献
17.
18.
Rosenberg ZS; Jahss MH; Noto AM; Shereff MJ; Cheung Y; Frey CC; Norman A 《Radiology》1988,167(2):489-493
Computed tomography (CT) was performed in 42 patients with 49 clinically suspected tears of the posterior tibial tendon. Twenty-eight of the 49 suspected tears were subsequently surgically explored and repaired. Three patterns of tendon abnormalities were recognized on CT scans: type I-intact, hypertrophied, heterogeneous tendon; type II-attenuated tendon; and type III-absence of a portion of a tendon. Types I and II correlated with partial rupture seen during surgery, and type III correlated with complete rupture of the tendon. CT findings were accurate in 96% of the patients who underwent surgery. In four cases (14%), tendon rupture was seen on CT scans, but the extent of the injury was underestimated and the rupture was misclassified. Reactive periostitis of the distal tibia was seen in 71% of diseased tendons and may represent an important factor in the diagnosis of tendon rupture. 相似文献
19.
20.
LN Weinberger MJ Zirwas JC English III 《Journal of the European Academy of Dermatology and Venereology》2007,21(2):156-162
Male genital oedema can be defined as swelling or the appearance of swelling of the scrotum and/or the penile shaft and prepuce. Despite the various causes of genital oedema reported in the published work, a concise approach to the evaluation and management has not been sufficiently addressed. 相似文献