全文获取类型
收费全文 | 726篇 |
免费 | 82篇 |
国内免费 | 19篇 |
专业分类
儿科学 | 24篇 |
妇产科学 | 23篇 |
基础医学 | 91篇 |
口腔科学 | 12篇 |
临床医学 | 40篇 |
内科学 | 223篇 |
皮肤病学 | 18篇 |
神经病学 | 14篇 |
特种医学 | 85篇 |
外科学 | 127篇 |
综合类 | 12篇 |
一般理论 | 1篇 |
预防医学 | 48篇 |
眼科学 | 17篇 |
药学 | 23篇 |
中国医学 | 2篇 |
肿瘤学 | 67篇 |
出版年
2021年 | 5篇 |
2020年 | 7篇 |
2019年 | 6篇 |
2018年 | 12篇 |
2017年 | 8篇 |
2016年 | 8篇 |
2015年 | 8篇 |
2014年 | 13篇 |
2013年 | 24篇 |
2012年 | 17篇 |
2011年 | 20篇 |
2010年 | 32篇 |
2009年 | 26篇 |
2008年 | 34篇 |
2007年 | 41篇 |
2006年 | 35篇 |
2005年 | 23篇 |
2004年 | 16篇 |
2003年 | 20篇 |
2002年 | 17篇 |
2001年 | 26篇 |
2000年 | 18篇 |
1999年 | 19篇 |
1998年 | 22篇 |
1997年 | 19篇 |
1996年 | 18篇 |
1995年 | 16篇 |
1994年 | 17篇 |
1993年 | 22篇 |
1992年 | 12篇 |
1991年 | 12篇 |
1990年 | 24篇 |
1989年 | 27篇 |
1988年 | 27篇 |
1987年 | 28篇 |
1986年 | 22篇 |
1985年 | 16篇 |
1984年 | 13篇 |
1983年 | 13篇 |
1982年 | 8篇 |
1981年 | 6篇 |
1980年 | 8篇 |
1979年 | 9篇 |
1978年 | 6篇 |
1977年 | 13篇 |
1976年 | 7篇 |
1975年 | 3篇 |
1974年 | 3篇 |
1973年 | 3篇 |
1931年 | 2篇 |
排序方式: 共有827条查询结果,搜索用时 15 毫秒
1.
2.
Christina M Marra Clare L Maxwell Ann C Collier Kevin R Robertson Allison Imrie 《BMC infectious diseases》2007,7(1):37
Background
Cerebrospinal fluid (CSF) pleocytosis may be seen in asymptomatic HIV-infected individuals. This finding complicates interpretation of CSF abnormalities when such individuals are evaluated for other central nervous system infections. The goal of this study was to determine the relationship between CSF pleocytosis, central nervous system (CNS) antiretroviral penetration, adherence to antiretroviral medication regimens, neurological symptoms and performance on neuropsychological tests. 相似文献3.
RAMASWAMY MANIKANDAN MAGDA KUJAWA EVELYN PEARSON PATRICK H O''REILLY STEPHEN CW BROWN 《International journal of urology》2004,11(4):206-212
BACKGROUND: To evaluate the results of the tension-free vaginal tape procedure (TVT) from a patient's perspective. METHODS: Between May 1999 and January 2002, 90 patients underwent a TVT for genuine stress incontinence (GSI) and mixed incontinence. Prior to the procedure, GSI was confirmed by clinical examination and urodynamic studies. Results were then audited from patient notes and the same patients were sent questionnaires to examine results from a patient perspective. RESULTS: Overall response rate to the questionnaire was 70 (77%). The mean age of the patients was 50.4 years (range 31-83 years). Sixty-one patients had spinal anesthesia, seven had general anesthesia and two had local anesthesia. Mean hospital stay was 3.36 days (range 2-14 days) and mean period from the operation to the time of the survey and audit was 16.34 months (range 3-28; SD 6.92). Thirty-nine (56%) of the 70 patients who answered said that the operation had cured their incontinence, 16 (23%) had an improvement in their symptoms, 7 (10%) had worsening of their symptoms and 8 (11%) felt that the operation did not make any difference. The overall success rate according to the patients' perspective was 79%, whereas our audit showed an overall success rate of 86% (77% and 82%, respectively, when we compared only the 66 patients who had both notes and replies available for analysis). CONCLUSION: Although a patient's perception regarding the success of TVT tends to differ from that of a clinician, it was not found to be statistically significant (P = 0.22, McNemar test). The TVT is a very successful operation, but realistic cure rates should be offered to patients. 相似文献
4.
Hodgkin disease: CT of the thymus 总被引:2,自引:0,他引:2
The computed tomography (CT) scans in two groups of patients with Hodgkin disease were reviewed to determine the frequency of thymic enlargement. In 50 CT scans from 50 patients with evidence of thoracic disease on CT scans who were examined for primary staging, the thymus was enlarged in 15 of 50 (30%). Fifty CT scans were obtained from 44 patients at the time of 50 separate episodes of known or suspected relapse. Relapse occurred in the mediastinum in 12 episodes, lung parenchyma in five, and both sites in one. Thymic enlargement thought to be due to involvement by disease was present in seven of 18 (38%). Mediastinal disease was associated with thymic enlargement in all but one patient in whom a thymic cyst developed after radiation therapy. Differentiation of thymic enlargement from enlarged superior mediastinal lymph nodes was easily made in all but two patients. Thymic enlargement in the absence of lymph node enlargement may indicate a different disease, since isolated Hodgkin disease of the thymus is uncommon. Primary thymic tumor should be considered initially, whereas after treatment, rebound hyperplasia of the thymus may be the cause of enlargement. 相似文献
5.
Five female patients and one male patient with solid and papillary epithelial neoplasms of the pancreas were examined with computed tomography (CT). The mean age of the patients was 27 years (range, 13-46 years). All cases showed well-encapsulated, round or lobulated masses consisting of both cystic and solid areas. Cystic portions showed CT numbers that suggested hemorrhagic necrosis. There were no internal septations within the masses. In three tumors located in the head of the pancreas, dilatation of the biliary tree was absent or minimal, although the masses were large. Two tumors contained calcifications. One tumor demonstrated metastatic deposits in liver and lymph nodes. Metastatic masses appeared similar to the primary pancreatic mass. Solid and papillary neoplasm of the pancreas should be the primary diagnostic consideration when characteristic CT findings are detected in a young female patient. 相似文献
6.
A patient who received one of the first homograft valves in Canada in 1965 is presented. Recent assessment including cardiac catheterization has shown that the valve is functioning well after 21 years. The patient is presented for historic interest, since this may be one of the longest functioning homograft valves. 相似文献
7.
8.
9.
Quantitative evaluation of the development of tracheal submucosal glands in infants with cystic fibrosis and control infants. 总被引:3,自引:1,他引:3
下载免费PDF全文
![点击此处可从《The American journal of pathology》网站下载免费的PDF全文](/ch/ext_images/free.gif)
The development of the tracheal submucosal glands has been determined quantitatively in 22 infants with cystic fibrosis and in 25 control infants, all under 4 months of age. In cross-sections of normal trachea significant relationships were found between postconceptional age (PCA) and gland area (P less than 0.001), submucosal area (P less than 0.02), tracheal airway diameter (P less than 0.05), and acinar diameter (P less than 0.001). In infants with cystic fibrosis the pattern of development was similar to that of the control infants. No statistically significant differences were found between three subgroups of infants with cystic fibrosis, which included those with meconium ileus with no lung infection, those with meconium ileus with lung infection, and those with lung infection and no history of meconium ileus. The normal pattern of development of tracheal submucosal glands in infants with cystic fibrosis was in contrast to the deficiency of normal maturation seen in the exocrine pancreas of these infants. The lumen fraction, an index of dilatation of acinar lumina, showed no significant relationship with PCA in either the control group or the group with cystic fibrosis. However, statistically significant dilatation of acini was observed in the tracheal submucosal glands of infants with cystic fibrosis (0.14, P less than 0.005). 相似文献
10.
Martijn W Heymans Dirk L Knol Willem van Mechelen Henrica CW de Vet 《BMC medical research methodology》2007,7(1):33