全文获取类型
收费全文 | 15589篇 |
免费 | 1371篇 |
国内免费 | 27篇 |
专业分类
耳鼻咽喉 | 143篇 |
儿科学 | 507篇 |
妇产科学 | 395篇 |
基础医学 | 2059篇 |
口腔科学 | 378篇 |
临床医学 | 1693篇 |
内科学 | 2803篇 |
皮肤病学 | 281篇 |
神经病学 | 1390篇 |
特种医学 | 556篇 |
外科学 | 2570篇 |
综合类 | 302篇 |
一般理论 | 18篇 |
预防医学 | 1380篇 |
眼科学 | 387篇 |
药学 | 1235篇 |
3篇 | |
中国医学 | 8篇 |
肿瘤学 | 879篇 |
出版年
2021年 | 220篇 |
2020年 | 139篇 |
2019年 | 232篇 |
2018年 | 256篇 |
2017年 | 182篇 |
2016年 | 223篇 |
2015年 | 265篇 |
2014年 | 361篇 |
2013年 | 523篇 |
2012年 | 751篇 |
2011年 | 825篇 |
2010年 | 414篇 |
2009年 | 390篇 |
2008年 | 657篇 |
2007年 | 671篇 |
2006年 | 685篇 |
2005年 | 588篇 |
2004年 | 586篇 |
2003年 | 583篇 |
2002年 | 479篇 |
2001年 | 460篇 |
2000年 | 499篇 |
1999年 | 408篇 |
1998年 | 190篇 |
1997年 | 124篇 |
1996年 | 150篇 |
1995年 | 142篇 |
1994年 | 117篇 |
1993年 | 135篇 |
1992年 | 392篇 |
1991年 | 351篇 |
1990年 | 366篇 |
1989年 | 340篇 |
1988年 | 338篇 |
1987年 | 314篇 |
1986年 | 297篇 |
1985年 | 331篇 |
1984年 | 256篇 |
1983年 | 211篇 |
1982年 | 144篇 |
1981年 | 122篇 |
1980年 | 121篇 |
1979年 | 237篇 |
1978年 | 171篇 |
1977年 | 122篇 |
1976年 | 117篇 |
1974年 | 119篇 |
1973年 | 128篇 |
1972年 | 112篇 |
1970年 | 115篇 |
排序方式: 共有10000条查询结果,搜索用时 12 毫秒
81.
82.
83.
J. R. M. Copeland C. McWilliam M. E. Dewey D. Forshaw R. Shiwach R. T. Abed M. S. Muthu N. Wood 《International journal of geriatric psychiatry》1986,1(1):63-70
A random community sample of 1070 subjects aged over 65 was interviewed by trained non-medical interviewers using the Geriatric Mental State, community version (GMSA). A sub-sample of 126 subjects was selected so as to contain possible early cases of dementia, pseudo-dementia, and normal subjects; and re-interviewed, a mean 1 year and 23 weeks later, by a group of psychiatrists in training. The computer diagnosis AGECAT, based on GMSA applied by non-medical raters, had predicted at initial interview, nine out of twelve cases of dementia at follow-up and five out of nine borderline cases. An Organic/Depression Index may prove useful in predicting which of those cases with early organic levels will eventually develop dementia, depression or recover. 相似文献
84.
Pulmonary artery sling with tracheal stenosis is a difficult management problem. We describe the use of cardiopulmonary bypass as a method to facilitate one-stage repair. 相似文献
85.
86.
87.
C Boger H Z Yuan T Schultek K F Tegtmeier W G Wood 《Zeitschrift für klinische Chemie und klinische Biochemie》1988,26(10):645-651
Immunoluminometric assays for lactoferrin and elastase-alpha 1-proteinase inhibitor complexes were developed using solid-phase methodology, which has already been published from this laboratory. The aim of the study was to develop a rapid method to see whether elevated granulocyte activity was present in the lung, as for example in neonatal sepsis. The lactoferrin assay gave reliable results within 30 minutes, the elastase-alpha 1-proteinase inhibitor complexes, within 5 hours. The correlation between both analytes was good, so that the lactoferrin assay could replace the elastase-alpha 1-proteinase inhibitor assay in emergency cases. The lactoferrin assay was used for rapid answer, the elastase-alpha 1-proteinase inhibitor complex assay for "fine" monitoring of the progress of the disease. Both assays could be used to measure concentrations in plasma or bronchoalveolar lavage using a 10 microliters sample. Plasma for the elastase-alpha 1-proteinase inhibitor complex determination had to be diluted 1:50 before being assayed. Only EDTA plasma was used in the assay, as either heparin plasma or serum resulted in granulocyte destruction, thus giving rise to elevated, and non-reproducible results. The results from bronchoalveolar lavage show an excellent correlation between elastase-alpha 1-proteinase inhibitor complexes and lactoferrin. No interference was seen from lipaemic or icteric plasma samples. Results from haemolytic samples i.e. where lysis of erythrocytes and leukocytes had occurred, had to be treated with care if no clinical indication of intravascular haemorrhage was present. The assays lend themselves to perinatal diagnosis, as the total volume of plasma or lavage needed is theoretically under 50 microliters, i.e. ethically acceptable for regular monitoring of neonates.(ABSTRACT TRUNCATED AT 250 WORDS) 相似文献
88.
D P Wood M Spencer B J Hocevar J E Montie R Kay 《The Urologic clinics of North America》1988,15(4):753-767
The postoperative care of stoma patients is truly life long. With the excellent stoma equipment available, no patient should be a "stoma cripple." New advances in continent reservoirs will improve patient acceptance and lessen the fear associated with stomas. Finally, close follow-up by both the enterostomal therapy nurse and the surgeon is essential for the complete care of the stoma patient. 相似文献
89.
C A Snyder R W Wood J F Graefe A Bowers K Magar 《Pharmacology, biochemistry, and behavior》1988,29(1):93-95
The smoking of cocaine base [corrected] ("crack") has emerged as a significant substance abuse problem. A detailed characterization of cocaine smoke is a prerequisite for studies of its pharmacokinetics, abuse potential and toxicity. Model pipes were used to generate cocaine smoke analogous to that inhaled by human "crack" abusers. Using procedures to minimize pyrolysis, cocaine base smoke was determined to be 93.5% cocaine particles with the remainder being cocaine vapor. The average particle size generated from all model pipes was 2.3 mu which is small enough to ensure deposition into the alveolar region of the human lung. Although this particle size is eminently respirable [corrected] by primates, a much smaller fraction will reach the alveolar region of rodents. Special generating procedures would therefore be required to expose rodents to meaningful doses of airborne cocaine that mimic the rapid absorption achieved by "crack" smokers. 相似文献
90.
Wood CD Manno JE Wood MJ Manno BR Mims ME 《Clinical research practices and drug regulatory affairs》1988,6(2):129-136
Ginger and several other medications were compared with scopolamine and d-amphetamine for effectiveness in prevention of motion sickness. Methods: Double-blind techniques were used. The subjects were given the medications two hours before they were rotated in a chair making head movements until a symptom total short of vomiting was reached. Standardized N.A.S.A. techniques were used for speed of rotation and end-point of motion sickness. Results: The three doses of ginger were all at the placebo level of efficacy. Amitriptyline, ethopropazine and trihexyphenidyl increased the tolerated head movements but the increase was not statistically significant. Significant levels of protection were produced by dimenhydrinate, promethazine, scopolamine and d-amphetamine. Protection was further increased by combination of these latter drugs with d-amphetamine. Efficacy was greatest as the dose was increased. Conclusions: The medication of choice in this study was scopolamine 0.6 mg with d-amphetamine 10 mg. This combination provided good protection with acceptable side effects. 相似文献