全文获取类型
收费全文 | 2665篇 |
免费 | 135篇 |
国内免费 | 8篇 |
专业分类
耳鼻咽喉 | 7篇 |
儿科学 | 115篇 |
妇产科学 | 71篇 |
基础医学 | 210篇 |
口腔科学 | 201篇 |
临床医学 | 168篇 |
内科学 | 802篇 |
皮肤病学 | 114篇 |
神经病学 | 153篇 |
特种医学 | 71篇 |
外科学 | 454篇 |
综合类 | 50篇 |
一般理论 | 3篇 |
预防医学 | 84篇 |
眼科学 | 46篇 |
药学 | 145篇 |
中国医学 | 8篇 |
肿瘤学 | 106篇 |
出版年
2023年 | 12篇 |
2022年 | 48篇 |
2021年 | 70篇 |
2020年 | 46篇 |
2019年 | 63篇 |
2018年 | 68篇 |
2017年 | 47篇 |
2016年 | 60篇 |
2015年 | 80篇 |
2014年 | 93篇 |
2013年 | 120篇 |
2012年 | 180篇 |
2011年 | 204篇 |
2010年 | 133篇 |
2009年 | 96篇 |
2008年 | 133篇 |
2007年 | 125篇 |
2006年 | 121篇 |
2005年 | 122篇 |
2004年 | 145篇 |
2003年 | 102篇 |
2002年 | 83篇 |
2001年 | 51篇 |
2000年 | 68篇 |
1999年 | 46篇 |
1998年 | 22篇 |
1997年 | 17篇 |
1996年 | 13篇 |
1995年 | 10篇 |
1994年 | 15篇 |
1993年 | 7篇 |
1992年 | 32篇 |
1991年 | 32篇 |
1990年 | 48篇 |
1989年 | 28篇 |
1988年 | 24篇 |
1987年 | 30篇 |
1986年 | 21篇 |
1985年 | 19篇 |
1984年 | 18篇 |
1983年 | 11篇 |
1982年 | 19篇 |
1981年 | 7篇 |
1979年 | 15篇 |
1978年 | 12篇 |
1977年 | 13篇 |
1975年 | 11篇 |
1973年 | 9篇 |
1972年 | 8篇 |
1969年 | 18篇 |
排序方式: 共有2808条查询结果,搜索用时 15 毫秒
1.
Stability of transverse expansion in the mandibular arch. 总被引:1,自引:0,他引:1
Jeffrey A Housley Ram S Nanda G Fr?ns Currier Dale E McCune 《American journal of orthodontics and dentofacial orthopedics》2003,124(3):288-293
This was a retrospective, longitudinal cephalometric and cast study of 29 white patients at pretreatment, posttreatment, and an average of 6 years 3 months postretention. The goal was to assess changes with treatment and retention with the expanding mandibular lingual arch appliance in conjunction with fixed edgewise treatment. Seven mandibular cast measurements were assessed, including arch crowding, arch perimeter, arch length, and arch width at the permanent canines, first premolars, second premolars, and first molars. Cephalometric radiographs were digitized, and 16 cephalometric measurements were made. Repeated-measures analysis of variance and 2-sample t tests were used to determine statistically significant changes. It was found that the expanding lingual arch used for less than 6 months with the mandibular fixed edgewise appliance caused an increase in both the transverse and sagittal dimensions of the mandibular dental arch. Transverse expansion was more stable in the posterior region of the mandibular dental arch than in the anterior region. Mandibular intercanine width increase could be maintained only by fixed retention. Although the maxillary and mandibular incisors were advanced and proclined, lip protrusion did not occur. 相似文献
2.
3.
4.
Spontaneous gall bladder perforation in infants is rare. We report a 3-month-old male infant who presented with progressive abdominal distension, low-grade fever, bilateral hydrocele and acholic stools. Ultrasonography showed free fluid in the peritoneal cavity, which was bile-stained on paracentesis. Surgical exploration revealed sterile biliary peritonitis and a gangrenous gall bladder. Partial cholecystectomy with external biliary drainage resulted in satisfactory recovery. 相似文献
5.
6.
Endoscopic sclerotherapy in the treatment of gastric varices 总被引:4,自引:0,他引:4
Of 309 patients with portal hypertension, gastric varices were found in 48 (16 per cent). While the majority (88 per cent) of the patients had gastric varices in association with oesophageal varices, 6 (12 per cent) patients had 'isolated' gastric varices. Gastric varices were seen significantly (P less than 0.01) more often with grade 4 than with grade 3 varices. In 11 (28 per cent) of the 40 patients who completed sclerotherapy for oesophageal varices, gastric varices disappeared concurrently on eradication of oesophageal varices or during the following 6 months. Of the initial five patients with gastric varices who received direct intravariceal injections, four rebled; this technique was therefore replaced by combination (paravariceal + intravariceal) gastric variceal sclerotherapy. Emergency combination sclerotherapy successfully controlled bleeding from gastric varices in six of the eight treated patients. Thirty-two patients entered a programme of elective combination gastric variceal sclerotherapy. Variceal obliteration was achieved in 12 cases (38 per cent) and reduction in size was noted in another 7 patients (22 per cent) after a minimum of four courses. There were 11 (23 per cent) deaths, 8 due to uncontrolled bleeding from gastric varices and 3 due to hepatic coma. The other complications of gastric variceal sclerotherapy were minor and included retrosternal pain, fever and dysphagia. It is concluded that gastric varices often coexist with large oesophageal varices. If they persist for 6 months after eradication of oesophageal varices, a combination of paravariceal and intravariceal sclerotherapy should be attempted for their obliteration. 相似文献
7.
A Survey of Childhood Psoriasis in Kuwait 总被引:1,自引:0,他引:1
Abstract: One hundred ninety cases of childhood (age birth-12 yrs) psoriasis constituted 0.3% of the total of new dermatologic outpatients. Girls outnumbered boys by a ratio of 1.5:1. Plaque psoriasis was the commonest clinical variant (84%), followed by guttate psoriasis. The scalp was the most common site of onset (22%). Sites predominantly affected later were the extensor surfaces of the legs and the scalp (63% and 53%, respectively). A majority of the children had a milder form of disease. Nail involvement was seen in 36%, with pitting the most common feature (87%). Seven percent had mucosal involvement. A positive family history of psoriasis was obtained in 28%. Topical therapy (coal tar, anthralin, steroids) was the main treatment in the majority of patients (92%). Sixteen patients (8%) required more aggressive intervention (ultraviolet B, psoralin-UVA, retinoids). This is the first study of this kind from the Middle East, the findings are compared with those reported from other parts of the world. 相似文献
8.
9.
10.
Starship Children's Hospital in Auckland, New Zealand, serves a population of 1.2 million people and is a tertiary institution
for pediatric trauma. This study is designed to review all cases of abdominal injury (blunt and penetrating) that resulted
in injury of a hollow abdominal viscus including the stomach, duodenum, small intestine, large intestine and urinary bladder.
The mechanism of injury; diagnosis and outcome were studied. This was done by retrospective chart review of patients admitted
from January 1995 to December 2001. Thirty two injuries were found in 29 children. The age ranged from 7 months to 15 years
with boys represented more commonly. Small bowel was the most frequently injured hollow viscus. Computerized Tomography (CT
scan) is an extremely useful tool for the diagnosis of HVI. 相似文献