全文获取类型
收费全文 | 43761篇 |
免费 | 3900篇 |
国内免费 | 2339篇 |
专业分类
耳鼻咽喉 | 453篇 |
儿科学 | 740篇 |
妇产科学 | 645篇 |
基础医学 | 5220篇 |
口腔科学 | 764篇 |
临床医学 | 5324篇 |
内科学 | 7381篇 |
皮肤病学 | 535篇 |
神经病学 | 2612篇 |
特种医学 | 1535篇 |
外国民族医学 | 16篇 |
外科学 | 4873篇 |
综合类 | 5322篇 |
现状与发展 | 7篇 |
一般理论 | 15篇 |
预防医学 | 3091篇 |
眼科学 | 1880篇 |
药学 | 4170篇 |
19篇 | |
中国医学 | 1845篇 |
肿瘤学 | 3553篇 |
出版年
2024年 | 110篇 |
2023年 | 598篇 |
2022年 | 1416篇 |
2021年 | 1941篇 |
2020年 | 1441篇 |
2019年 | 1424篇 |
2018年 | 1475篇 |
2017年 | 1369篇 |
2016年 | 1281篇 |
2015年 | 1711篇 |
2014年 | 2224篇 |
2013年 | 2167篇 |
2012年 | 3164篇 |
2011年 | 3367篇 |
2010年 | 2050篇 |
2009年 | 1692篇 |
2008年 | 2409篇 |
2007年 | 2429篇 |
2006年 | 2280篇 |
2005年 | 2249篇 |
2004年 | 1712篇 |
2003年 | 1606篇 |
2002年 | 1416篇 |
2001年 | 1179篇 |
2000年 | 1029篇 |
1999年 | 963篇 |
1998年 | 533篇 |
1997年 | 469篇 |
1996年 | 359篇 |
1995年 | 359篇 |
1994年 | 317篇 |
1993年 | 244篇 |
1992年 | 395篇 |
1991年 | 375篇 |
1990年 | 304篇 |
1989年 | 274篇 |
1988年 | 266篇 |
1987年 | 256篇 |
1986年 | 193篇 |
1985年 | 160篇 |
1984年 | 93篇 |
1983年 | 120篇 |
1982年 | 58篇 |
1981年 | 64篇 |
1980年 | 59篇 |
1979年 | 85篇 |
1978年 | 56篇 |
1977年 | 31篇 |
1976年 | 28篇 |
1973年 | 27篇 |
排序方式: 共有10000条查询结果,搜索用时 0 毫秒
31.
The ability of rabbits to clear an intraperitoneal injection of Pseudomonas aeruginosa in the presence or absence of a surgically implanted peritoneal device was investigated. Sham-operated rabbits without an implant eliminated a P. aeruginosa challenge of 5 x 10(6) cfu/ml; lavage fluid and peritoneal tissues became culture-negative within 96 h. However, peritonitis developed in rabbits that were given the same number of bacteria in the presence of an implant; high bacterial counts were recovered from the lavage fluid and the device itself. Scanning and transmission electronmicroscopy revealed bacterial biofilms on the surface of the device. Insertion of pre-colonised devices demonstrated a rapid multiplication of sessile organisms within the resulting bacterial biofilm. Counts reached a plateau of about 1 x 10(7) cfu/cm2 of Silastic by day 16 and fluctuated around this level until the end of the study. Pre-immunisation with formalin-killed whole cells of P. aeruginosa did not reduce this bacterial growth despite high levels of specific IgG. The results confirm the failure of peritoneal defences to clear an infection in the presence of an implant following either challenge with planktonic bacteria or insertion of a pre-colonised device, and demonstrate the rapid development of bacterial biofilms on the surface of the implant which appear to protect the bacteria from host defences, even when primed by pre-immunisation. 相似文献
32.
This study investigated the relationship of protective factors (PF) to adult adaptation in a nonclinical sample consisting of 264 undergraduate women: two groups without childhood sexual abuse (CSA), high (n = 109) and low (n = 99) on PF; and two groups with CSA, high (n = 17) and low (n = 27) on PF. The first hypothesis that higher levels of PF would be significantly associated with higher levels of functioning for all individuals was supported by the data. The second hypothesis that the women with CSA and higher levels of PF would appear similar in adaptation to those without CSA was also supported. The findings further suggest that though the protective factors were beneficial for most individuals, they were significantly more helpful for those with CSA. 相似文献
33.
Manifestations and treatment of 793 cases of decompression sickness in a compressed air tunneling project in Hong Kong 总被引:1,自引:0,他引:1
In the largest compressed air tunneling contract for the construction of the Island Line of the Mass Transit Railway system in Hong Kong, 154,390 man-decompressions occurred, of which 142,140 were after exposures to 1 bar (1.97 ATA, 14.7 psig) or above. The maximum working pressure (MWP) was 3.30 bar (4.26 ATA, 47.9 psig). There were 792 cases of type I and 1 case of type II decompression sickness. The manifestations of the cases were generally similar to those reported elsewhere. Oxygen treatment was given to 9 cases and all were successfully treated with no recurrence of symptoms. Minimum effective pressure treatment on 783 type I cases was successful, with 9.6% requiring two or more recompressions. The pressure required to relieve symptoms was more closely related to the interval between completion of decompression after work and commencement of treatment than to the delay between onset of symptoms and treatment. For every 1-h interval or every 1-h delay, an additional pressure of 0.04 bar (0.04 ATA, 0.58 psi) above MWP was required for pain relief. Step-wise multiple regression analysis showed that the four predictors for pressure of relief and the highest pressure used in recompression, respectively, were, in order of descending importance, maximum working pressure, interval before treatment, bends sequence (the nth attack of bends experienced in the present contract, i.e., the sum of previous attacks and the present attack), and duration of exposure. 相似文献
34.
Efficacy of radical neck dissection for the control of cervical metastasis after radiotherapy for nasopharyngeal carcinoma 总被引:5,自引:0,他引:5
Fifty-one patients who had persistent or recurrent neck disease from nasopharyngeal carcinoma after radiotherapy underwent radical neck dissection. The follow-up period ranged from 0.5 to 9 years (median: 2 years). Multiple cervical lymph node involvement was present in 51% of the patients (26 of 51). Malignant cells were detected in 88% of the resected specimens (45 of 51). The clinical sign of fixation of lymph node is the only factor that affects the successful control of neck disease (p = 0.04). Extracapsular extension of the nodal disease was present, and 35% of the lymph nodes were adherent to surrounding structures at operation (18 of 51). There was one hospital mortality and the overall morbidity was minimal. The actuarial survival at 5 years was 38%, and the probability of control of neck disease was 66%. Radical neck dissection is effective in controlling post-irradiation cervical metastasis from nasopharyngeal carcinoma. 相似文献
35.
Elevation of prostaglandins and protein in the aqueous humor is an immediate response to Yag-laser anterior capsulotomy. There was a significant correlation between prostaglandins and thromboxane to the elevation of intraocular pressure. The elevation of protein concentration was proportional to the elevation of prostaglandin F1, but not to thromboxane. The biochemical changes in the aqueous humor were more severe as laser power was increased above 3 mj. While the role of prostaglandins in the elevation of intraocular pressure is uncertain, the present data recommend the selection of laser power below 3 mj to avoid pressure rise instead of inhibition of all prostaglandin synthesis by medication. 相似文献
36.
37.
Andrew K. C. Lam Abby Lam Jessie Charm Kwai-mui Wong 《Ophthalmic & physiological optics》2005,25(2):162-167
PURPOSE: This study compared the near phoria measurement using the Bernell muscle balance card with and without prism neutralization, using both trial frame and phoropter correction, and compared with the conventional Maddox rod method. METHODS: Forty young normal Chinese adults had their near phoria measured with trial frame correction using the conventional muscle balance card method (method 1). Any deviation was compensated with a prism bar as an alternative approach (method 2). The conventional Maddox rod method (method 3) was also carried out for comparison. These three methods were repeated with phoropter correction and considered as methods 4, 5 and 6. RESULTS: The phorias obtained from these six methods were not significantly different from each other (repeated measures anova, p > 0.05). More than half of the subjects were exophoric. Although the difference in phoria was not significant, phoria measurement using phoropter correction yielded a greater coefficient of variation. CONCLUSIONS: Near phoria measurement using the muscle balance card conducted with trial frame correction was less variable, and was also more natural and similar to a real reading situation. The use of prism for compensation did not affect the phoria results. Exophoria seems to be more common than esophoria in young Chinese adults. 相似文献
38.
39.
40.