全文获取类型
收费全文 | 2550132篇 |
免费 | 197636篇 |
国内免费 | 3869篇 |
专业分类
耳鼻咽喉 | 34592篇 |
儿科学 | 84211篇 |
妇产科学 | 72220篇 |
基础医学 | 370121篇 |
口腔科学 | 74539篇 |
临床医学 | 232321篇 |
内科学 | 492721篇 |
皮肤病学 | 55180篇 |
神经病学 | 206158篇 |
特种医学 | 98643篇 |
外国民族医学 | 713篇 |
外科学 | 374809篇 |
综合类 | 59468篇 |
现状与发展 | 5篇 |
一般理论 | 1060篇 |
预防医学 | 205342篇 |
眼科学 | 58355篇 |
药学 | 190786篇 |
10篇 | |
中国医学 | 4481篇 |
肿瘤学 | 135902篇 |
出版年
2018年 | 25217篇 |
2016年 | 21622篇 |
2015年 | 25055篇 |
2014年 | 34551篇 |
2013年 | 53066篇 |
2012年 | 71740篇 |
2011年 | 76222篇 |
2010年 | 44683篇 |
2009年 | 42883篇 |
2008年 | 72395篇 |
2007年 | 76911篇 |
2006年 | 77243篇 |
2005年 | 75299篇 |
2004年 | 73488篇 |
2003年 | 70426篇 |
2002年 | 68586篇 |
2001年 | 113899篇 |
2000年 | 117238篇 |
1999年 | 99579篇 |
1998年 | 27904篇 |
1997年 | 25386篇 |
1996年 | 25664篇 |
1995年 | 24726篇 |
1994年 | 23119篇 |
1993年 | 21778篇 |
1992年 | 81540篇 |
1991年 | 79634篇 |
1990年 | 77690篇 |
1989年 | 75246篇 |
1988年 | 69829篇 |
1987年 | 68721篇 |
1986年 | 65604篇 |
1985年 | 62983篇 |
1984年 | 47510篇 |
1983年 | 41401篇 |
1982年 | 24470篇 |
1981年 | 22060篇 |
1980年 | 20785篇 |
1979年 | 45469篇 |
1978年 | 32305篇 |
1977年 | 27220篇 |
1976年 | 25556篇 |
1975年 | 27177篇 |
1974年 | 33139篇 |
1973年 | 32206篇 |
1972年 | 29949篇 |
1971年 | 28101篇 |
1970年 | 26122篇 |
1969年 | 24744篇 |
1968年 | 22722篇 |
排序方式: 共有10000条查询结果,搜索用时 0 毫秒
151.
152.
153.
154.
155.
We report a case of cervical necrotizing fasciitis (CNF) in a female having uncontrolled type II diabetes mellitus. The patient was presented to us after 20 days of preliminary symptoms. The aetiology of microbial inoculation in subdermal tissue was not known. The isolate was Staphylococcus aureus. In spite of the delay in presentation, the patient was successfully treated with combined antimicrobial and surgical intervention. 相似文献
156.
T. Svara M. Gombac M. Vrecl P. Juntes R. Kostanjsek A. Pogacnik M. Pogacnik 《Transboundary and Emerging Diseases》2006,53(1):26-29
Clinicopathological and electron microscopical findings of eight cases of enzootic nasal adenocarcinoma of sheep, diagnosed solely in one big flock in Slovenia between years 2001 and 2003 are described. All affected sheep were female, their mean age was 4.5 ± 1.5 years and they either belonged to the Istrian pramenka breed (five sheep) or were crossbreeds (three sheep). Tumours that arose from the ethmoid area of the nasal cavity were unilateral in six cases (75%) and bilateral in two cases (25%). All tumours were classified as adenocarcinomas by histopathological examination and they displayed either a combination of tubular and papillary growth or less often solely tubular proliferation. No metastases were detected in regional lymph nodes, brain or other organs. Electron microscopical studies performed on the reprocessed paraffin‐embedded tissues revealed the presence of the virus‐like particles with an average diameter between 70 and 90 nm. 相似文献
157.
The influence of short‐term confinement and moderate exercise on tibia development was investigated in growing pigs (36–41 kg, 10 weeks at the beginning of the study). Animals were kept for 2 weeks either in individual crates of 0.8 m2 (‘confinement’, n = 4) or kept in groups of four animals in large crates of 5.6 m2 without (‘control’) or with additional exercise (30 min walking at 5 days/week; ‘exercise’). Bone density and morphological parameters were evaluated by computer tomography (CT). Periosteal apposition and longitudinal growth were determined after polychrome sequential labelling in weekly intervals. Cortical areas of the cross sections at the mid‐shaft and at 75% of the length of the bone measured distal to the carpus by CT were significantly correlated to each other (r = 0.70) and revealed a significant reduction in confined animals. This difference was explained by lower periosteal apposition rates in these animals compared with exercised and group‐housed pigs. Similarly longitudinal growth and the formation and calcification of spongiosa of the tibiae were inhibited by confinement. Thus, 2 weeks of confinement led to significant differences in bone growth and metabolism in young growing piglets when compared with animals with moderate activity. 相似文献
158.
Gerald T Voelbel Marsha E Bates Jennifer F Buckman Gahan Pandina Robert L Hendren 《Neuropsychopharmacology》2006,60(9):942-950
BACKGROUND: Impaired neuropsychological test performance, especially on tests of executive function and attention, is often seen in children diagnosed with autism spectrum disorders (ASD). Structures involved in fronto-striatal circuitry, such as the caudate nucleus, may support these cognitive abilities. However, few studies have examined caudate volumes specifically in children with ASD, or correlated caudate volumes to cognitive ability. METHODS: Neuropsychological test scores and caudate volumes of children with ASD were compared to those of children with bipolar disorder (BD) and of typically developing (TD) children. The relationship between test performance and caudate volumes was analyzed. RESULTS: The ASD group displayed larger right and left caudate volumes, and modest executive deficits, compared to TD controls. While caudate volume inversely predicted performance on the Wisconsin Card Sorting Test in all participants, it differentially predicted performance on measures of attention across the ASD, BD and TD groups. CONCLUSIONS: Larger caudate volumes were related to impaired problem solving. On a test of attention, larger left caudate volumes predicted increased impulsivity and more omission errors in the ASD group as compared to the TD group, however smaller volume predicted poorer discriminant responding as compared to the BD group. 相似文献
159.
160.