全文获取类型
收费全文 | 26384篇 |
免费 | 3651篇 |
国内免费 | 151篇 |
专业分类
耳鼻咽喉 | 538篇 |
儿科学 | 873篇 |
妇产科学 | 945篇 |
基础医学 | 2366篇 |
口腔科学 | 394篇 |
临床医学 | 5678篇 |
内科学 | 4649篇 |
皮肤病学 | 668篇 |
神经病学 | 2140篇 |
特种医学 | 607篇 |
外科学 | 2834篇 |
综合类 | 682篇 |
现状与发展 | 2篇 |
一般理论 | 17篇 |
预防医学 | 3885篇 |
眼科学 | 487篇 |
药学 | 1281篇 |
1篇 | |
中国医学 | 119篇 |
肿瘤学 | 2020篇 |
出版年
2024年 | 74篇 |
2023年 | 515篇 |
2022年 | 279篇 |
2021年 | 696篇 |
2020年 | 805篇 |
2019年 | 584篇 |
2018年 | 1003篇 |
2017年 | 932篇 |
2016年 | 1003篇 |
2015年 | 1142篇 |
2014年 | 1296篇 |
2013年 | 1899篇 |
2012年 | 1726篇 |
2011年 | 1784篇 |
2010年 | 1268篇 |
2009年 | 1235篇 |
2008年 | 1521篇 |
2007年 | 1503篇 |
2006年 | 1439篇 |
2005年 | 1372篇 |
2004年 | 1261篇 |
2003年 | 1190篇 |
2002年 | 950篇 |
2001年 | 302篇 |
2000年 | 221篇 |
1999年 | 251篇 |
1998年 | 446篇 |
1997年 | 461篇 |
1996年 | 422篇 |
1995年 | 338篇 |
1994年 | 271篇 |
1993年 | 209篇 |
1992年 | 155篇 |
1991年 | 150篇 |
1990年 | 140篇 |
1989年 | 158篇 |
1988年 | 121篇 |
1987年 | 98篇 |
1986年 | 102篇 |
1985年 | 103篇 |
1984年 | 113篇 |
1983年 | 99篇 |
1982年 | 85篇 |
1981年 | 88篇 |
1980年 | 74篇 |
1979年 | 44篇 |
1978年 | 42篇 |
1977年 | 37篇 |
1976年 | 30篇 |
1974年 | 24篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
41.
Vanaporn Wuthiekanun Varunee Desakorn Gumphol Wongsuvan Premjit Amornchai Allen C. Cheng Bina Maharjan Direk Limmathurotsakul Wirongrong Chierakul Nicholas J. White Nicholas P. J. Day Sharon J. Peacock 《Clinical and Vaccine Immunology : CVI》2005,12(4):555-556
An immunofluorescent (IF) method that detects Burkholderia pseudomallei in clinical specimens within 10 min was devised. The results of this rapid method and those of an existing IF method were prospectively compared with the culture results for 776 specimens from patients with suspected melioidosis. The sensitivities of both IF tests were 66%, and the specificities were 99.5 and 99.4%, respectively. 相似文献
42.
43.
Smith Kevin C. BA BSc MD FACP FRCPC Melnychuk Michael BSc DDS 《Dermatologic surgery》2005,31(S4):1635-1637
Background. Injection of filler substances into the lips is painful, and many patients also find the injection of local or regional anesthesia into the lips painful.
Objective. To develop a highly effective and painless form of anesthesia to facilitate injection of filler substances into the lips.
Methods. Five percent lidocaine cream was applied simultaneously to the skin, vermilion, and mucosa of the lips (with the use of a barrier to keep the cream in contact with the mucosa and out of the rest of the mouth) for 20 to 30 minutes.
Results. Profound anesthesia of the lips was reliably produced, with no complications.
Conclusions. This "anesthetic cream block" is easier to perform and better tolerated than injectable anesthetics. Use of this technique is likely to expand the range of physicians who perform filler injections on the lips and will probably also expand the range of patients who wish to have filler injections done on their lips and who (because they had little or no discomfort) are willing to return for additional filler injections in the future. 相似文献
Objective. To develop a highly effective and painless form of anesthesia to facilitate injection of filler substances into the lips.
Methods. Five percent lidocaine cream was applied simultaneously to the skin, vermilion, and mucosa of the lips (with the use of a barrier to keep the cream in contact with the mucosa and out of the rest of the mouth) for 20 to 30 minutes.
Results. Profound anesthesia of the lips was reliably produced, with no complications.
Conclusions. This "anesthetic cream block" is easier to perform and better tolerated than injectable anesthetics. Use of this technique is likely to expand the range of physicians who perform filler injections on the lips and will probably also expand the range of patients who wish to have filler injections done on their lips and who (because they had little or no discomfort) are willing to return for additional filler injections in the future. 相似文献
44.
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
45.
Anita Rachlis Jonathan Angel Marianne Harris Richard Lalonde Fiona Smaill Cecile Tremblay Chris Tsoukas Sharon Walmsley 《The Canadian Journal of Infectious Diseases & Medical Microbiology》2006,17(3):155-163
BACKGROUND AND OBJECTIVES: An eight-member group consisting of Canadian infectious disease and immunology specialists and a family physician with significant experience in HIV management was convened to update existing recommendations, specifically intended for use by Canadian HIV-treating physicians, on the appropriate use of enfuvirtide in HIV/AIDS patients with resistance to other antiretroviral drugs. METHODS: Evidence from the literature and expert opinions of the group members formed the basis of the guidelines. Comments on the draft guidelines were obtained from other physicians across Canada with HIV expertise. The final guidelines represent the group's consensus agreement. RESULTS AND CONCLUSIONS: The recommendations were developed to guide physicians in optimal practices in patient selection for enfuvirtide treatment and subsequent patient management. The issues considered include positive predictors of response to enfuvirtide, stage of disease, optimization of the background regimen, early indicators of enfuvirtide response, and patient education and support. 相似文献
46.
Pyomyositis: characteristics at CT and MR imaging 总被引:9,自引:0,他引:9
47.
Judith L. Marks PhD Elizabeth M. Hill PhD Cynthia S. Pomerleau PhD Sharon A. Mudd PhD Frederic C. Blow PhD 《Journal of substance abuse treatment》1997,14(6):337-527
We compared nicotine dependence and withdrawal in male alcoholic and control ever-smokers, controlling for relevant demographic and clinical variables. Alcoholics were more likely to meet criteria for moderate or severe nicotine dependence and endorse more nicotine dependence symptoms. Symptoms reported more frequently by alcoholics included: (a) using nicotine in larger amounts or over a longer time than intended; (b) continued use despite problems caused or exacerbated by nicotine; (c) marked tolerance; and (d) experiencing characteristic nicotine withdrawal symptoms. Alcoholics also smoked more heavily. Other than “headaches,” and “decreased heart rate,” alcoholics consistently endorsed nicotine withdrawal symptoms at a higher rate. After controlling for demographic and clinical variables and level of nicotine dependence, only “feel depressed” differed significantly between groups. Our research supports previous findings suggesting that nicotine dependence is more severe in those with a history of alcohol dependence. As a result, alcoholics may experience greater discomfort from nicotine withdrawal upon smoking cessation. 相似文献
48.
49.
50.
Ann E. Klasner MD Sharon R. Smith MD Michael W. Thompson BS Pharm Anthony J. Scalzo MD 《Academic emergency medicine》1998,5(10):992-996
Abstract. Objectives:To describe the outcomes of a mass carbon monoxide (CO) intoxication, and to calculate the CO half-life in a pediatric school-aged population.
Methods:A retrospective chart review was performed based on Regional Poison Center database information, hospital laboratory data, and medical records of the pediatric patients who sought care at one of 3 St. Louis area hospitals, after exposure to high levels of CO. Exposures occurred on January 5, 1996, after evidence of a CO leak was discovered at an area elementary school. Charts were reviewed for major demographics, symptoms reported, carboxyhemoglobin (COHb) levels and times, and level of effect.
Results:Information about 177 (35%) of the 504 children in attendance at school that day was available. Mean age was 8.7 ± 1.8 years (range 4–12 years). Symptoms were present in 155 (88%) of the 177 children for whom data were available. Initial COHb levels were obtained for 147 (83.1%) of the 177 children. First mean COHb level was 7.0% (95% CI = 6.6–7.5%). Second COHb level was obtained for 26 children with a mean of 2.7% (95% CI = 2.2–3.2%). Calculated half-life of COHb, on 100% 02 at 1 atm, was 44.0 minutes (95% CI = 39.6–48.2 minutes).
Conclusion:Some children had symptoms at COHb levels that traditionally have been considered nontoxic. The elimination of COHb was found to be more rapid in this population of children than reported in other studies. 相似文献
Methods:A retrospective chart review was performed based on Regional Poison Center database information, hospital laboratory data, and medical records of the pediatric patients who sought care at one of 3 St. Louis area hospitals, after exposure to high levels of CO. Exposures occurred on January 5, 1996, after evidence of a CO leak was discovered at an area elementary school. Charts were reviewed for major demographics, symptoms reported, carboxyhemoglobin (COHb) levels and times, and level of effect.
Results:Information about 177 (35%) of the 504 children in attendance at school that day was available. Mean age was 8.7 ± 1.8 years (range 4–12 years). Symptoms were present in 155 (88%) of the 177 children for whom data were available. Initial COHb levels were obtained for 147 (83.1%) of the 177 children. First mean COHb level was 7.0% (95% CI = 6.6–7.5%). Second COHb level was obtained for 26 children with a mean of 2.7% (95% CI = 2.2–3.2%). Calculated half-life of COHb, on 100% 0
Conclusion:Some children had symptoms at COHb levels that traditionally have been considered nontoxic. The elimination of COHb was found to be more rapid in this population of children than reported in other studies. 相似文献