全文获取类型
收费全文 | 76481篇 |
免费 | 4097篇 |
国内免费 | 258篇 |
专业分类
耳鼻咽喉 | 1084篇 |
儿科学 | 4729篇 |
妇产科学 | 1371篇 |
基础医学 | 9281篇 |
口腔科学 | 1971篇 |
临床医学 | 5489篇 |
内科学 | 14965篇 |
皮肤病学 | 1942篇 |
神经病学 | 4431篇 |
特种医学 | 2004篇 |
外科学 | 11037篇 |
综合类 | 2618篇 |
一般理论 | 33篇 |
预防医学 | 4082篇 |
眼科学 | 3086篇 |
药学 | 7232篇 |
1篇 | |
中国医学 | 572篇 |
肿瘤学 | 4908篇 |
出版年
2023年 | 533篇 |
2022年 | 1548篇 |
2021年 | 2725篇 |
2020年 | 1487篇 |
2019年 | 1779篇 |
2018年 | 2373篇 |
2017年 | 1686篇 |
2016年 | 2177篇 |
2015年 | 2261篇 |
2014年 | 3255篇 |
2013年 | 3917篇 |
2012年 | 5507篇 |
2011年 | 5493篇 |
2010年 | 3221篇 |
2009年 | 2684篇 |
2008年 | 3927篇 |
2007年 | 3962篇 |
2006年 | 3758篇 |
2005年 | 3141篇 |
2004年 | 3048篇 |
2003年 | 2633篇 |
2002年 | 2224篇 |
2001年 | 1645篇 |
2000年 | 1592篇 |
1999年 | 1349篇 |
1998年 | 606篇 |
1997年 | 450篇 |
1996年 | 448篇 |
1995年 | 412篇 |
1994年 | 341篇 |
1993年 | 290篇 |
1992年 | 878篇 |
1991年 | 781篇 |
1990年 | 829篇 |
1989年 | 748篇 |
1988年 | 658篇 |
1987年 | 624篇 |
1986年 | 604篇 |
1985年 | 575篇 |
1984年 | 438篇 |
1983年 | 360篇 |
1982年 | 215篇 |
1979年 | 363篇 |
1978年 | 232篇 |
1977年 | 267篇 |
1975年 | 245篇 |
1974年 | 246篇 |
1973年 | 253篇 |
1972年 | 240篇 |
1971年 | 226篇 |
排序方式: 共有10000条查询结果,搜索用时 0 毫秒
61.
62.
Delta hepatitis virus infection in China 总被引:1,自引:0,他引:1
D Q Wang H H Cheng G Y Minuk L H Liu C M Anand T C Stowe H X Wang D C Ying Y R Tu K A Buchan 《International journal of epidemiology》1987,16(1):79-83
To assess the prevalence, epidemiological features and prognostic implications of hepatitis D (Delta) in Sichuan Province, The People's Republic of China, 649 sera (515 from HBsAg positive patients and 134 from HBsAg negative subjects) were tested by radioimmunoassay (RIA) for antibody to the hepatitis D virus (anti-HD). Forty-seven sera (7.2%) showed some degree of reactivity. Serial dilutions of these sera indicated that prozoning was not responsible for the equivocal results. Thirty-four of the 47 sera were submitted under code to a second laboratory for independent analysis. According to those results anti-HD antibodies were detected in four of these sera. The overall prevalence of anti-HD in the HBsAg positive patients therefore was 0.8% (4/515). On the basis of clinical, biochemical and histological data 427 HBsAg positive sera were further divided into acute Type B hepatitis, chronic Type B hepatitis, healthy carrier state and hepatocellular carcinoma (HCC) subgroups. Two of 65 (3.1%) anti-HD positive sera belonged to the acute Type B hepatitis group; one of 104 (0.9%), the chronic Type B hepatitis group and one of 246 (0.4%), the healthy carrier group. No antibody was detected in sera from 12 HBsAg positive HCC patients. All HBsAg negative patients were negative for anti-HD antibody. The results of this study indicate that despite a high prevalence of hepatitis B virus infection, positive serology for delta virus is uncommon in Sichuan Province, The People's Republic of China. 相似文献
63.
C Vaishnavi C Sokhey S Kaur B Kumar J B Dilawari N K Ganguly 《Indian journal of leprosy》1989,61(2):211-215
An ELISA technique has been developed to detect HBsAg in the sera of leprosy patients. Out of ninety-two serum samples taken from untreated leprosy patients, 10 samples were positive for HBsAg. The ELISA used in the present investigation is a low cost, reliable and sensitive marker of HBsAg. It is better than lesser sensitive (haemagglutination and counterimmunoelectrophoresis), costly and hazardous (radioimmunoassay) techniques and is therefore recommended for routine use. 相似文献
64.
Concurrent positive serology for ehrlichiosis and Lyme disease 总被引:1,自引:0,他引:1
65.
Allergic autoimmune reaction after exposure to heavy metals such as mercury may play a causal role in autism, a developmental disorder of the central nervous system. As metallothionein (MT) is the primary metal-detoxifying protein in the body, we conducted a study of the MT protein and antibodies to metallothionein (anti-MT) in normal and autistic children whose exposure to mercury was only from thimerosal-containing vaccines. Laboratory analysis by immunoassays revealed that the serum level of MT did not significantly differ between normal and autistic children. Furthermore, autistic children harboured normal levels of anti-MT, including antibodies to isoform MT-I (anti-MT-I) and MT-II (anti-MT-II), without any significant difference between normal and autistic children. Our findings indicate that because autistic children have a normal profile of MT and anti-MT, the mercury-induced autoimmunity to MT may not be implicated in the pathogenesis of autism. 相似文献
66.
67.
Guntur E Luis Chee-Khuen Yong Deepak A Singh S Sengupta David SK Choon 《Journal of orthopaedic surgery and research》2007,2(1):22-10
Background
Acromioclavicular injuries are common in sports medicine. Surgical intervention is generally advocated for chronic instability of Rockwood grade III and more severe injuries. Various methods of coracoclavicular ligament reconstruction and augmentation have been described. The objective of this study is to compare the biomechanical properties of a novel palmaris-longus tendon reconstruction with those of the native AC+CC ligaments, the modified Weaver-Dunn reconstruction, the ACJ capsuloligamentous complex repair, screw and clavicle hook plate augmentation. 相似文献68.
The abdominal compartment syndrome is a life threatening condition resulting from pathologic elevation of the intraabdominal pressure. Prompt diagnosis is required to avoid significant sequelae. Diagnosis of this syndrome is based on clinical findings and intra abdominal pressure monitoring. Treatment consists of decompressive laparotomy, which corrects the pathology. Various surgical techniques are described to manage the open abdomen. Despite considerable attention accorded to this disorder, it is still associated with high morbidity and mortality. This review article deals with the identification of risk factors, pathophysiology, diagnostic criteria and treatment of critically ill patients with the abdominal compartment syndrome. 相似文献
69.
Mubin I Syed Najeeb Chaudhry Azim Shaikh Kamal Morar Kumar Mukerjee Earl Damallie 《Journal canadien de gastroenterologie》2007,21(2):117-123
Over the past 10 years, arteriography has become a well-established technique for the diagnosis of acute lower gastrointestinal bleeding, but not particularly for rectal bleeding. However, to the authors' knowledge, the technique of middle hemorrhoidal artery embolization has rarely been reported in the literature. In the present report, three patients with life-threatening rectal bleeding are presented, which was controlled by superselective embolization of the middle hemorrhoidal artery or selective embolization of the internal iliac artery as a last resort. 相似文献
70.
Serum LH, FSH and testosterone were quantitated in 9 patients with pure motor stroke within 24-48 h of its reported onset. High circulating LH with normal or low testosterone was noted in 8 of them. In response to an intravenous bolus of GnRH, the LH responses were exaggerated in all, but the FSH responses in 7 of them were comparable to those in eugonadal age matched controls. The rise in testosterone following 2000U hCG daily for 3 consecutive days was insignificant in the patients group compared to the controls. The data suggest normally operative pituitary testicular feed-back but decreased Leydig cell response in pure motor stroke. 相似文献