全文获取类型
收费全文 | 1287篇 |
免费 | 86篇 |
国内免费 | 15篇 |
专业分类
耳鼻咽喉 | 6篇 |
儿科学 | 86篇 |
妇产科学 | 41篇 |
基础医学 | 167篇 |
口腔科学 | 44篇 |
临床医学 | 109篇 |
内科学 | 283篇 |
皮肤病学 | 25篇 |
神经病学 | 38篇 |
特种医学 | 149篇 |
外科学 | 99篇 |
综合类 | 46篇 |
一般理论 | 1篇 |
预防医学 | 77篇 |
眼科学 | 35篇 |
药学 | 98篇 |
中国医学 | 2篇 |
肿瘤学 | 82篇 |
出版年
2023年 | 3篇 |
2022年 | 16篇 |
2021年 | 24篇 |
2020年 | 17篇 |
2019年 | 30篇 |
2018年 | 32篇 |
2017年 | 21篇 |
2016年 | 30篇 |
2015年 | 36篇 |
2014年 | 43篇 |
2013年 | 63篇 |
2012年 | 74篇 |
2011年 | 83篇 |
2010年 | 48篇 |
2009年 | 51篇 |
2008年 | 61篇 |
2007年 | 60篇 |
2006年 | 69篇 |
2005年 | 70篇 |
2004年 | 59篇 |
2003年 | 51篇 |
2002年 | 49篇 |
2001年 | 13篇 |
2000年 | 7篇 |
1999年 | 23篇 |
1998年 | 29篇 |
1997年 | 43篇 |
1996年 | 31篇 |
1995年 | 25篇 |
1994年 | 26篇 |
1993年 | 18篇 |
1992年 | 6篇 |
1991年 | 14篇 |
1990年 | 8篇 |
1989年 | 24篇 |
1988年 | 16篇 |
1987年 | 16篇 |
1986年 | 13篇 |
1985年 | 13篇 |
1984年 | 8篇 |
1983年 | 15篇 |
1982年 | 11篇 |
1981年 | 13篇 |
1980年 | 10篇 |
1979年 | 4篇 |
1978年 | 3篇 |
1977年 | 3篇 |
1976年 | 2篇 |
1975年 | 1篇 |
1974年 | 3篇 |
排序方式: 共有1388条查询结果,搜索用时 31 毫秒
101.
Posteroanterior (PA) and caudally angulated PA views were obtained in 20 patients undergoing routine coronary arteriography. Although the left main coronary artery (LMCA) was seen well on both views in all patients, the PA-caudal view improved depiction of the LMCA bifurcation in 15 (75%). In addition, the PA-caudal view markedly improved depiction of the circumflex artery, affording optimal depiction of this artery and its branches in 78%-89% of patients. Neither the PA nor the PA-caudal view allowed adequate depiction of the left anterior descending artery. Thus, the PA-caudal view should supplant the PA view in routine coronary arteriography. 相似文献
102.
PL.RM. Palaniappan Selvi Sabhanayakam N. Krishnakumar M. Vadivelu 《Food and chemical toxicology》2008,46(7):2440-2444
Catla catla fingerlings were reared in freshwater and exposed to 15.5 ppm concentration of lead for 60 days. The morphological changes on the gill of the C. catla fingerlings due to lead intoxication and the effect of DMSA (meso 2,3-dimercaptosuccinic acid) on the affected tissues were observed using Scanning Electron Microscope. It has been found that the lead treated gill tissues showed certain marked changes, such as cell hypertrophy, alteration in the lamellar surfaces, epithelial hyperplasia and the fusion of adjacent lamellae. The antidote DMSA treatment reduces the toxic effects and helps the recovery of gill tissue and its return to the level of the control/normal. 相似文献
103.
104.
M Perry I Drašković T van Achterberg GF Borm MIJ van Eijken PL Lucassen MJFJ Vernooij-Dassen MGM Olde Rikkert 《BMC health services research》2008,8(1):71
Background
Early diagnosis of dementia benefits both patient and caregiver. Nevertheless, dementia in primary care is currently under-diagnosed. Some educational interventions developed to improve dementia diagnosis and management were successful in increasing the number of dementia diagnoses and in changing attitudes and knowledge of health care staff. However, none of these interventions focussed on collaboration between GPs and nurses in dementia care. We developed an EASYcare-based Dementia Training Program (DTP) aimed at stimulating collaboration in dementia primary care. We expect this program to increase the number of cognitive assessments and dementia diagnoses and to improve attitudes and knowledge of GPs and nurses. 相似文献105.
When inferior vena caval obstruction complicates the Budd-Chiari syndrome, conventional portosystemic shunts are not possible. The mesoatrial shunt has been devised to enable portal and sinusoidal decompression in these patients. Findings in 12 patients with Budd-Chiari syndrome and inferior vena caval obstruction in whom a mesoatrial shunt was performed are reported. Preoperative inferior vena cavography with pressure measurements is essential to determine the appropriate shunt procedure. Postoperatively, shunt patency is assessed with superior mesenteric arterial portography. Where possible, transvenous catheterization of the shunt is performed to confirm patency and assess hemodynamic function. 相似文献
106.
Conventional computer-based medical expert systems deliver advice to physicians as written text. While such advice is useful, it has distinct limitations in a visually oriented discipline such as diagnostic radiology, in which decisions often depend on pattern recognition and appreciation of subtle morphologic features. The authors developed a prototype expert computer system, IMAGE/ICON, which displays groups of images sorted into a series of axes based on different ways in which they may be similar. They may share a common feature, group of features, causes, or clinical setting. IMAGE/ICON may display examples of morphologic variations of a dominant finding or a spectrum of abnormalities seen in an specific disease or group of diseases. The system also assembles a written analysis of key features of a case. Such a tool may be useful as a diagnostic aid or for continuing medical education. It is likely to have particular impact in the form of an intelligent radiologic workstation, as picture archiving and communication systems become available. 相似文献
107.
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
108.
PL Kogon Jerry Tchoryk Owen Fleming 《The Journal of the Canadian Chiropractic Association》1987,31(4):191-192
Pellegrini-Stieda disease is a condition occasionally observed on routine radiographic examinations of the knee. A literature survey revealed little in the way of explanation or therapeutic management of this disorder. An overview of this condition with an emphasis on etiological theory and treatment is offered along with two classic radiographic examples. 相似文献
109.
Rakesh Aggarwal Rakesh Kumar Rekha Pal Sita Naik S N Semwal S R Naik 《Indian journal of gastroenterology》2002,21(1):14-18
BACKGROUND: We undertook epidemiologic and laboratory studies during an epidemic of acute hepatitis in Sindri town, in District Dhanbad, Bihar in 1998. METHODS: A sample survey covering 201 randomly selected houses in the town was conducted during the epidemic, and records of patients admitted to the only large hospital in this town were reviewed. We also tested serum and stool specimens from some of the affected persons for hepatitis E virus (HEV) RNA and IgM anti-HEV antibodies. RESULTS: Of the 1088 persons residing in the surveyed houses, 82 (7.54%) had developed acute hepatitis during the outbreak. Attack rate was higher among male residents than among female residents (71/604 vs. 11/484; 11.75% vs. 2.27%; relative risk [RR] 5.17 [95% confidence interval 2.77-9.65]; p<10(-6)) and was the highest in the 10-29 year age group. Hospital admission data showed similar age and gender distribution. Disease occurrence had no relation with source of drinking water (handpump 7.56% vs. municipal tap 7.53%; p=ns), or with habit of boiling (RR 1.10 [0.61-1.98]; p=ns) or filtering (RR 0.59 [0.33-1.06]; p=ns) water before drinking. Jaundice occurred more frequently among persons who had traveled outside Sindri town during the last two months than among those who had not (26.4% vs. 4.7%; RR 5.67 [3.81-8.43]; p<10(-6)); this risk persisted after correction for age (Mantel-Haenszel weighted OR 6.74 [4.12-11.01]; p<10(-6)). Men traveled more frequently than women and were more often affected. In multivariate analysis, travel and male gender were the only two independent risk factors. Data from a hospital in a neighboring large city, Dhanbad, suggested that there was an outbreak of hepatitis in that city too at the same time. Seventy-three of the 1088 study subjects had history of jaundice in the past; disease attack rate among these persons (9.6%) was similar to that among those without such history (7.5%; RR 1.31 [0.49-2.98]; p=ns). Of the 13 sera tested, 10 were positive for IgM anti-HEV. HEV RNA was detected in 9 of the 12 stool specimens and 10 of the 13 sera tested. CONCLUSIONS: The hepatitis epidemic in Sindri was caused by HEV and had several features resembling those of previous HEV epidemics. However, the occurrence of hepatitis E showed a strong relationship with history of travel, a finding not hitherto described. 相似文献
110.
Vasumati Upadhye Sheetal Gujral Amita Maheshwari Rekha Wuntkal Sudeep Gupta Hemant Tongaonkar 《Indian journal of gastroenterology》2005,24(5):216-217
Intra-peritoneal rupture or perforation into adjacent abdominal viscera is a rare complication of benign cystic teratoma (dermoid cyst) of the ovary. We report a 48-year-old woman in whom an ovarian dermoid cyst perforated into a loop of the small bowel. The patient had co-existing typhoid fever, which probably predisposed to this complication. She recovered on antibiotic therapy and after surgical excision. 相似文献