全文获取类型
收费全文 | 1285篇 |
免费 | 71篇 |
国内免费 | 3篇 |
专业分类
耳鼻咽喉 | 2篇 |
儿科学 | 117篇 |
妇产科学 | 20篇 |
基础医学 | 95篇 |
口腔科学 | 34篇 |
临床医学 | 202篇 |
内科学 | 276篇 |
皮肤病学 | 22篇 |
神经病学 | 44篇 |
特种医学 | 257篇 |
外科学 | 96篇 |
综合类 | 19篇 |
预防医学 | 91篇 |
眼科学 | 4篇 |
药学 | 30篇 |
中国医学 | 1篇 |
肿瘤学 | 49篇 |
出版年
2020年 | 11篇 |
2019年 | 8篇 |
2018年 | 18篇 |
2017年 | 16篇 |
2016年 | 15篇 |
2015年 | 18篇 |
2014年 | 21篇 |
2013年 | 23篇 |
2012年 | 26篇 |
2011年 | 17篇 |
2010年 | 39篇 |
2009年 | 48篇 |
2008年 | 37篇 |
2007年 | 30篇 |
2006年 | 34篇 |
2005年 | 27篇 |
2004年 | 43篇 |
2003年 | 31篇 |
2002年 | 22篇 |
2001年 | 23篇 |
2000年 | 15篇 |
1999年 | 22篇 |
1998年 | 55篇 |
1997年 | 71篇 |
1996年 | 55篇 |
1995年 | 43篇 |
1994年 | 54篇 |
1993年 | 53篇 |
1992年 | 13篇 |
1991年 | 21篇 |
1990年 | 19篇 |
1989年 | 46篇 |
1988年 | 46篇 |
1987年 | 35篇 |
1986年 | 33篇 |
1985年 | 31篇 |
1984年 | 14篇 |
1983年 | 22篇 |
1982年 | 20篇 |
1981年 | 22篇 |
1980年 | 21篇 |
1978年 | 14篇 |
1977年 | 16篇 |
1976年 | 12篇 |
1975年 | 26篇 |
1974年 | 6篇 |
1973年 | 12篇 |
1970年 | 5篇 |
1969年 | 10篇 |
1966年 | 7篇 |
排序方式: 共有1359条查询结果,搜索用时 15 毫秒
91.
92.
93.
A Nørremølle E Budtz-Jørgensen K Fenger JE Nielsen SA Sørensen and L Hasholt 《Clinical genetics》2009,75(3):244-250
Huntington disease (HD) is caused by an expanded CAG repeat sequence in the HD gene. Although the age at onset is correlated to the CAG repeat length, this correlation only explains approximately half of the variation in onset age. Less variation between siblings indicates that the variation is, in part, explained by genetic modifiers. We analyzed polymorphic loci within or close to the HD gene on the HD chromosome in Danish HD patients. We found one specific haplotype segregating with later age at onset, compared with patients with similar CAG repeat length and another haplotype. The nine Danish families in the study carrying this haplotype most likely have a common founder. Several of the polymorphic loci displayed alleles that may be specific to the late-onset haplotype, implicating that from this study we cannot determine which of the loci tested (or other polymorphic loci in this chromosomal area) do in fact contain genetic modifiers of age at onset. 相似文献
94.
95.
96.
JE Barberie DG Connell PL Munk DL Janzen 《Journal of Medical Imaging and Radiation Oncology》1999,43(3):355-357
Muscle and nerve injuries in the hand may be difficult to detect and diagnose clinically. Two cases are reported in which magnetic resonance imaging showed ulnar nerve injury and intrinsic hand muscle denervation. The clinical, anatomical and radiological features of injury to the deep motor branch of the ulnar nerve and associated muscle denervation are discussed and illustrated. 相似文献
97.
D B Cheek G H McIntosh V O'Brien D Ness R C Green 《European journal of clinical nutrition》1989,43(3):161-168
Comparative studies of body weight, height, intracellular water representing cell mass, and age, and plasma concentrations of albumin, vitamins, trace elements and iron stores in Aboriginal children aged 6 to 13.5 years, from two rural Aboriginal settlements and one rural Caucasian school (Hawker) provided evidence of significant deficits in one of the Aboriginal settlements (Yalata). Yalata Aboriginal children had lower body weights and heights for age and lower intracellular water values. Plasma albumin, zinc, iron, alpha-tocopherol, beta-carotene and retinol concentrations were lower relative to the normally grown Aboriginal children at Nepabunna. The latter children did not differ from rural Caucasian children for the parameters studied. The reasons for this poorer growth at Yalata may reside in poor nutrition, or repeated bowel infection in postnatal life leading to malabsorption, or both. Limited observational evidence suggests that Giardiasis has a high prevalence at Yalata, and it has been shown elsewhere that Giardiasis is capable of inducing malabsorption with resulting nutritional deficiencies. 相似文献
98.
99.
Moore AD; Godwin JD; Muller NL; Naidich DP; Hammar SP; Buschman DL; Takasugi JE; de Carvalho CR 《Radiology》1989,172(1):249-254
The authors retrospectively evaluated radiographs, computed tomographic (CT) scans, and results of pulmonary function tests (when available) for 17 patients with biopsy-proved pulmonary histiocytosis X. In 11 patients, high-resolution CT was used. In 12 patients, CT demonstrated cystic air spaces, usually less than 10 mm in diameter. In three of these 12, cysts were the only abnormality, but in six others, nodules (usually less than 5 mm in diameter) were also present. Two patients had only nodules and one, only emphysema. CT showed that many lesions that appeared reticular on plain radiographs were actually cysts. CT showed no central or peripheral concentration of lesions, but it did reveal that many small nodules were distributed in the centers of secondary lobules around small airways. CT findings correlated better with the diffusing capacity (rho = -0.71) than did the plain radiographic findings (rho = -0.57). Thus, CT was better than radiography at showing the morphology and distribution of lung abnormalities. 相似文献
100.
Among 600 infants examined with ultrasound for vomiting, seven (mean age, 3 months) had distinctive features that can be considered diagnostic of gastric ulcer. The findings are thickening of the mucosa (greater than 4 mm) in the antropyloric region, elongation of the antropyloric canal, persistent spasm, and delayed gastric emptying. Two of the infants had slight thickening of the pyloric muscle. Gastrointestinal series or endoscopy demonstrated thickened gastric mucosa and a deformed gastric antrum in all infants, as well as actual ulceration in five. 相似文献