全文获取类型
收费全文 | 45305篇 |
免费 | 3111篇 |
国内免费 | 117篇 |
专业分类
耳鼻咽喉 | 577篇 |
儿科学 | 1205篇 |
妇产科学 | 914篇 |
基础医学 | 5459篇 |
口腔科学 | 752篇 |
临床医学 | 4908篇 |
内科学 | 9728篇 |
皮肤病学 | 714篇 |
神经病学 | 3826篇 |
特种医学 | 1711篇 |
外国民族医学 | 3篇 |
外科学 | 7295篇 |
综合类 | 557篇 |
一般理论 | 47篇 |
预防医学 | 3950篇 |
眼科学 | 916篇 |
药学 | 3135篇 |
中国医学 | 36篇 |
肿瘤学 | 2800篇 |
出版年
2023年 | 246篇 |
2022年 | 446篇 |
2021年 | 1202篇 |
2020年 | 705篇 |
2019年 | 1097篇 |
2018年 | 1338篇 |
2017年 | 954篇 |
2016年 | 943篇 |
2015年 | 1133篇 |
2014年 | 1688篇 |
2013年 | 2267篇 |
2012年 | 3241篇 |
2011年 | 3340篇 |
2010年 | 1794篇 |
2009年 | 1645篇 |
2008年 | 2829篇 |
2007年 | 2755篇 |
2006年 | 2594篇 |
2005年 | 2647篇 |
2004年 | 2478篇 |
2003年 | 2235篇 |
2002年 | 2091篇 |
2001年 | 607篇 |
2000年 | 543篇 |
1999年 | 532篇 |
1998年 | 413篇 |
1997年 | 332篇 |
1996年 | 327篇 |
1995年 | 249篇 |
1994年 | 254篇 |
1993年 | 233篇 |
1992年 | 421篇 |
1991年 | 394篇 |
1990年 | 350篇 |
1989年 | 357篇 |
1988年 | 319篇 |
1987年 | 319篇 |
1986年 | 270篇 |
1985年 | 252篇 |
1984年 | 221篇 |
1983年 | 212篇 |
1982年 | 163篇 |
1981年 | 143篇 |
1980年 | 135篇 |
1979年 | 191篇 |
1978年 | 155篇 |
1977年 | 134篇 |
1975年 | 106篇 |
1974年 | 124篇 |
1973年 | 121篇 |
排序方式: 共有10000条查询结果,搜索用时 46 毫秒
71.
72.
Rakel Kling Marc Corbière Rebecca Milord Janet G Morrison Kevin Craib Annalee Yassi Claire Sidebottom Catherine Kidd Victoria Long Sharon Saunders 《AAOHN journal》2006,54(11):481-487
This study examined the use and effectiveness of the Alert assessment form. The form is part of the Alert system, used by one large acute care hospital to identify patients with a propensity for violence. All reported incidents of patient violence from August 1, 2003, through December 31, 2004, were included in patient charts. One hundred seventeen violent patient charts were reviewed and compared with 161 non-violent patient charts, randomly chosen from the same time period. Overall use of the Alert assessment form for violent and non-violent patients was 75.7% and 35.4%, respectively. The assessment form was found to have moderate sensitivity (71%) and high specificity (94%). It is reasonably effective in identifying potentially violent or aggressive patients when it is used according to protocol. Efforts to improve the tool are warranted, as is evaluation of its benefit in settings with low prevalence of violence. Also, greater effort must be taken to prevent violence once an aggressive patient has been identified. 相似文献
73.
Limited retention of information in the graphemic buffer 总被引:1,自引:0,他引:1
R B Katz 《Cortex; a journal devoted to the study of the nervous system and behavior》1991,27(1):111-119
This study examined a patient who mainly made letter deletion errors in spelling. It was hypothesized that his errors were due primarily to limited ability to retain information in the graphemic buffer, a structure that holds sequences of abstract letter identities for output. Consistent with this hypothesis, the patient's spelling accuracy declined on long words, but the number of letters he wrote per response was not related to word length. Moreover, by having him write words forward and backward, it was shown that his accuracy within a word depended on which part of the word he tried to output first. These results also ruled out alternative accounts of the patient's spelling deficit based on neglect or damage to lexical representations. 相似文献
74.
75.
A self-administered hand diagram has been developed to assist in the evaluation of upper extremity paresthesias. A rating system was devised to classify diagrams into four categories: classic, probable, possible, or unlikely carpal tunnel syndrome. Diagram ratings of 63 patients (85 hands) evaluated in a hand clinic were compared with diagnoses established independent of diagram results by objective clinical criteria. The sensitivity of diagrams rated classic or probable was 80% and specificity was 90%. We conclude that the hand diagram is valuable in the diagnosis of carpal tunnel syndrome among patients with upper extremity paresthesias. 相似文献
76.
G. Rennert A. Tamir L. Katz R. Steinitz L. Epstein 《European journal of epidemiology》1988,4(4):461-469
The magnitude and dynamics of lung cancer incidence in Jews and Arabs in Israel between the years 1962 and 1982 were studied. In general, age-standardized incidence rates increased consistently between the years 1962 and 1976 among Jewish (24% increase) and Arab (39%) males, and to a lesser degree among Jewish females (15%). Arab females had the highest (77%) increase. From 1977 to 1982 a general decrease in incidence rates, which was largest among Arab males (19%) and females (15%), was noted. Rates among Jewish males are currently 26% higher than among Arab males, and are 162% higher among Jewish females than in Arab females. Lung cancer rates in both males and females in Istrael (Jews and Arabs) are lower than in most developed countries in the world. Among the possible reasons are differences in the population risk factors profile, availability of health care and the level of diagnosis and ascertainment of cases. 相似文献
77.
78.
Kevin G Becker Insong J Lee James W Nagle Rachel D Canning Ameer M Gado Rosarelis Torres Mihael H Polymeropoulos Paul T Massa WilliamE Biddison Paul D Drew 《International journal of developmental neuroscience》1997,15(7):73
We describe a novel human zinc finger cNDA, C2H2-171. This cDNA represents an mRNA which encodes a protein of 484 amino acids and a calculated molecular weight of 54 kD. Four zinc finger-like domains are found in the C-terminal end of the protein. At the N-terminus, C2H2-171 contains a POZ/tramtrack-like domain similar to that found in the tumor associated zinc finger proteins LAZ-3/BCL-6 and PLZ-F, as well as in non-zinc finger proteins. C2H2-171 RNA is preferentially expressed in the brain, and increases during the course of murine development, with maximal expression in the adult. C2H2-171 RNA is differentially expressed in brain regions, with the highest level of expression in the cerebellum. C2H2-171 RNA was expressed at high levels in primary cerebellar granule cell neurons compared to astrocytes. The gene encoding C2H2-171 is highly conserved in vertebrates, and maps to the terminus of human chromosome 1 (1q44-ter). This chromosomal location is associated with a number of cytogenetic aberrations including those involving brain developmental anomalies and tumorigenesis. These data suggest that C2H2-171 may play an important role in vertebrate brain development and function. 相似文献
79.
Visual disturbances, serum glycine levels and transurethral resection of the prostate 总被引:2,自引:0,他引:2
Transient visual disturbances have been noted in patients undergoing transurethral resection of the prostate. It has been suggested recently that these visual aberrations were secondary to high serum concentrations of glycine from the intravasation of irrigant solutions used during the procedure. We prospectively studied visual acuity, serum electrolytes, glucose, ammonia and glycine concentrations in 18 patients undergoing transurethral resection of the prostate. Of our patient population 22% experienced significant decreases in visual acuity. We found that all patients had significantly elevated serum glycine concentrations but that there was no correlation of visual symptomatology with serum electrolyte or glucose concentrations. Our data further suggest that impeded metabolism of glycine may be more important than the absolute serum concentration in symptomatic patients. 相似文献
80.
1. The effect of omega-3 fatty acid supplementation on alpha 1-adrenergic receptor-mediated phosphoinositide turnover in the hearts of 6-week streptozotocin diabetic rats was studied. 2. The diabetic state was characterized by decreased body weight gain, hypoinsulinemia and hyperglycemia. Omega-3 fatty acid treatment did not have any significant effects on the above parameters. 3. Plasma triglyceride and cholesterol levels were significantly higher in diabetic rats compared with controls. 4. Omega-3 fatty acid treatment reduced the plasma triglyceride levels in the diabetic rats, whereas plasma cholesterol levels remained unaffected. 5. Norepinephrine (10 and 100 microM) stimulated inositol monophosphate (IP1) formation was significantly decreased in the diabetic rat heart compared with controls. Omega-3 fatty acid treatment had no significant effect on the norepinephrine-mediated IP1 formation in these rats. 6. Inositol bisphosphate (IP2) formation in response to 100 microM of norepinephrine was significantly lower in the diabetic rat heart; which was also not affected by omega-3 fatty acid treatment. 相似文献