全文获取类型
收费全文 | 12640篇 |
免费 | 1122篇 |
国内免费 | 16篇 |
专业分类
耳鼻咽喉 | 152篇 |
儿科学 | 370篇 |
妇产科学 | 234篇 |
基础医学 | 1654篇 |
口腔科学 | 448篇 |
临床医学 | 1146篇 |
内科学 | 3144篇 |
皮肤病学 | 184篇 |
神经病学 | 1287篇 |
特种医学 | 272篇 |
外国民族医学 | 3篇 |
外科学 | 1724篇 |
综合类 | 264篇 |
一般理论 | 14篇 |
预防医学 | 1291篇 |
眼科学 | 286篇 |
药学 | 712篇 |
中国医学 | 10篇 |
肿瘤学 | 583篇 |
出版年
2021年 | 190篇 |
2020年 | 103篇 |
2019年 | 151篇 |
2018年 | 215篇 |
2017年 | 141篇 |
2016年 | 136篇 |
2015年 | 191篇 |
2014年 | 258篇 |
2013年 | 500篇 |
2012年 | 589篇 |
2011年 | 649篇 |
2010年 | 369篇 |
2009年 | 356篇 |
2008年 | 618篇 |
2007年 | 718篇 |
2006年 | 679篇 |
2005年 | 674篇 |
2004年 | 685篇 |
2003年 | 640篇 |
2002年 | 639篇 |
2001年 | 148篇 |
2000年 | 150篇 |
1999年 | 132篇 |
1998年 | 135篇 |
1997年 | 138篇 |
1996年 | 114篇 |
1995年 | 107篇 |
1994年 | 113篇 |
1993年 | 108篇 |
1992年 | 105篇 |
1991年 | 131篇 |
1990年 | 121篇 |
1989年 | 125篇 |
1988年 | 113篇 |
1987年 | 87篇 |
1986年 | 108篇 |
1985年 | 118篇 |
1984年 | 154篇 |
1983年 | 152篇 |
1982年 | 173篇 |
1981年 | 155篇 |
1980年 | 169篇 |
1979年 | 120篇 |
1978年 | 135篇 |
1977年 | 120篇 |
1976年 | 115篇 |
1975年 | 99篇 |
1974年 | 78篇 |
1973年 | 98篇 |
1972年 | 85篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
41.
Gallbladder dyskinesia in chronic acalculous cholecystitis 总被引:4,自引:0,他引:4
Dr. William R. Brugge MD Douglas L. Brand MD Harold L. Atkins MD Bernard P. Lane MD William G. Abel MD 《Digestive diseases and sciences》1986,31(5):461-467
To test the hypothesis that there is an early stage of cholesterol gallstone formation in man characterized by symptoms of chronic cholecystitis, poor gallbladder emptying, and biliary cholesterol crystals, we studied cholecystokinin-stimulated gallbladder emptying by DISIDA scintigraphy and examined bile for cholesterol crystals in symptomatic patients with normal oral cholecystography and gallbladder sonography. Of 36 patients studied, 16 had biliary cholesterol crystals; their mean 30-min gallbladder ejection fraction was 25.9±14.8%. Among the 20 patients without crystals, the mean ejection fraction was 60.3±23.3%. Fifteen patients, 11 with crystals and four without, had cholecystectomy because of persistent symptoms. All with crystals preoperatively and three without had chronic cholecystitis histologically. One patient without crystals had normal histology. We conclude that poor gallbladder contractility, well-established as an etiologic factor in animal models of cholesterol cholelithiasis, is now linked to acalculous cholecystitis, an early stage of human cholesterol cholelithiasis. 相似文献
42.
Hematological Complications of Alcoholism 总被引:4,自引:0,他引:4
Harold S. Ballard 《Alcoholism, clinical and experimental research》1989,13(5):706-720
Numerous clinical observations support the notion that ethanol has multiple pathologic effects on hematopoietic tissue. The effects of alcohol on blood are diverse. The long-term ingestion of large quantities of ethanol has been shown to alter a substantial number of physiologic and biochemical variables. Abnormalities involving leukocytes, platelets, and erythrocytes may occur singly or in various combinations. Due to the frequent concomitant presence of alcohol-related hepatic disease, nutritional deficiencies, infection, and other chronic diseases, it is often difficult to distinguish the specific hematologic toxicities of alcohol ingestion from the hematologic toxicities of associated morbid conditions. Depressed hematopoietic cell formation (Table 2), increased destruction, and alterations in morphology and function of hematopoietic cells have been described. 相似文献
43.
44.
45.
Coexistence of Neoplasia and Cortical Dysplasia in Patients Presenting with Seizures 总被引:16,自引:10,他引:6
Summary: Tumors and cortical dysplasia are associated with epilepsy, but few studies have examined the coexistence of neoplasia and dysplasia in these patients. We studied 13 patients (age 4–29 years) with recurrent seizures of 1 month to 21-year' duration (median 72 months). Ten patients were aged <21 years. Imaging studies localized the lesion to the temporal lobe (10 patients), parietal lobe (2 patients), and frontal lobe (1 patient). Tumors included ganglioglioma (8 patients), dysembryoplastic neuroepithelial tumor (DNT) (3 patients), and low-grade as- trocytoma (2 patients). Cortical dysplasia, including atypical aggregates of neurons (6 patients), multifocal loss of the cortical laminar architecture (7 patients), and neurons in the molecular layer of the cortex (3 patients) were observed near but separate from the tumor. Coexistence of certain tumors with cortical dysplasia, most frequently observed in the pediatric population, suggests a hamar-tomatous/dysplastic nature of the neoplasms. 相似文献
46.
A patient is reported in whom pretreatment with intravenous lidocaine resulted in failure to elicit a seizure even at stimulus intensity markedly greater than that used successfully at prior and subsequent treatments. Together with one other report, this experience suggests that lidocaine may prevent a seizure by raising the seizure threshold. An alternative explanation is proposed for the classic findings of Ottosson that lidocaine-modified seizures are reduced in therapeutic efficacy. 相似文献
47.
This paper explores a number of the dimensions of the process of afterwork: the psychological work that former patients engage in after treatment has terminated. Ten former patients, who had worked with 10 different therapists, were interviewed utilizing a semi-structured interview protocol, and their experiences form the basis for the findings and observations that are described. It was found that subjects remembered little by way of lessons or insights; rather, what remained with them were changes of perspective, the internalization of the process of the treatment, and the experience of their therapists' human qualities. In addition, it was found that most subjects had had some form of contact with their therapists post-termination. The implications of these findings are discussed. 相似文献
48.
49.
50.