全文获取类型
收费全文 | 1416682篇 |
免费 | 104547篇 |
国内免费 | 2208篇 |
专业分类
耳鼻咽喉 | 18549篇 |
儿科学 | 45272篇 |
妇产科学 | 37891篇 |
基础医学 | 209014篇 |
口腔科学 | 37772篇 |
临床医学 | 132924篇 |
内科学 | 279999篇 |
皮肤病学 | 29807篇 |
神经病学 | 117002篇 |
特种医学 | 52264篇 |
外国民族医学 | 278篇 |
外科学 | 201241篇 |
综合类 | 27781篇 |
现状与发展 | 6篇 |
一般理论 | 764篇 |
预防医学 | 116130篇 |
眼科学 | 32306篇 |
药学 | 102440篇 |
7篇 | |
中国医学 | 2207篇 |
肿瘤学 | 79783篇 |
出版年
2021年 | 11870篇 |
2019年 | 12483篇 |
2018年 | 16393篇 |
2017年 | 12510篇 |
2016年 | 13778篇 |
2015年 | 16002篇 |
2014年 | 22287篇 |
2013年 | 34154篇 |
2012年 | 47152篇 |
2011年 | 50174篇 |
2010年 | 28874篇 |
2009年 | 27644篇 |
2008年 | 47543篇 |
2007年 | 50714篇 |
2006年 | 49912篇 |
2005年 | 49332篇 |
2004年 | 47400篇 |
2003年 | 45282篇 |
2002年 | 43863篇 |
2001年 | 57392篇 |
2000年 | 58104篇 |
1999年 | 49533篇 |
1998年 | 15389篇 |
1997年 | 13957篇 |
1996年 | 14115篇 |
1995年 | 13281篇 |
1994年 | 12352篇 |
1992年 | 39150篇 |
1991年 | 38556篇 |
1990年 | 37256篇 |
1989年 | 36032篇 |
1988年 | 33455篇 |
1987年 | 32704篇 |
1986年 | 31299篇 |
1985年 | 29639篇 |
1984年 | 23027篇 |
1983年 | 20217篇 |
1982年 | 12768篇 |
1981年 | 11598篇 |
1979年 | 21643篇 |
1978年 | 16197篇 |
1977年 | 13481篇 |
1976年 | 12461篇 |
1975年 | 13318篇 |
1974年 | 16121篇 |
1973年 | 15807篇 |
1972年 | 14867篇 |
1971年 | 13805篇 |
1970年 | 12988篇 |
1969年 | 12274篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
31.
Harvey A. Siegal PhD ; Paul J. Draus PhD ; Robert G. Carlson PhD ; Russel S. Falck MA ; Jichuan Wang PhD 《The Journal of rural health》2006,22(2):169-173
CONTEXT: Although the nonmedical use of stimulant drugs such as cocaine and methamphetamine is increasingly common in many rural areas of the United States, little is known about the health beliefs of people who use these drugs. PURPOSE: This research describes illicit stimulant drug users' views on health and health-related concepts that may affect their utilization of health care services. METHODS: A respondent-driven sampling plan was used to recruit 249 not-in-treatment, nonmedical stimulant drug users who were residing in 3 rural counties in west central Ohio. A structured questionnaire administered by trained interviewers was used to collect information on a range of topics, including current drug use, self-reported health status, perceived need for substance abuse treatment, and beliefs about health and health services. FINDINGS: Participants reported using a wide variety of drugs nonmedically, some by injection. Alcohol and marijuana were the most commonly used drugs in the 30 days prior to the interview. Powder cocaine was used by 72.3% of the sample, crack by 68.3%, and methamphetamine by 29.7%. Fair or poor health status was reported by 41.3% of the participants. Only 20.9% of the sample felt they needed drug abuse treatment. Less than one third of the sample reported that they would feel comfortable talking to a physician about their drug use, and 65.1% said they preferred taking care of their problems without getting professional help. CONCLUSIONS: Stimulant drug users in rural Ohio are involved with a range of substances and hold health beliefs that may impede health services utilization. 相似文献
32.
JM Martín† L Calduch† C Monteagudo‡ I Molina† D Ramón† V Alonso† E Jordᆠ《Journal of the European Academy of Dermatology and Venereology》2006,20(4):428-431
Cutaneous plasmacytosis is a rare disorder characterized by a benign proliferation of mature plasma cells that appears as multiple dark-brown to purplish skin lesions, often associated with polyclonal hypergammaglobulinaemia. We present the case of a 55-year-old Caucasian man who suffered from a cutaneous plasmacytosis associated with two different carcinomas. Cutaneous plasmacytosis seems to be a reactive process because most cases reported are not associated with any apparent underlying disease. Nevertheless, because few reported cases were associated with malignancies, screening of additional neoplasms would be justified. 相似文献
33.
O Fricke G Lehmkuhl E Schoenau 《Experimental and clinical endocrinology & diabetes》2006,114(4):197-203
Cell physiology and molecular biology typically follow a reductionistic approach in science. In the last decade, molecular principles and pathogenetic factors involved in the development of many diseases have been successfully discovered. Therefore, early biological concepts based on systemic and cybernetic thoughts have been largely overshadowed by these more recent molecular and pathogenetic factors. This review highlights discoveries on bone development and hypothalamic controlled feeding and eating behavior with a cybernetic and systemic perspective. Interestingly, ancient ideas on bone development and hypothalamic function are still reasonable considerations to embed new molecular discoveries into a systemic concept of principles organizing nature. 相似文献
34.
35.
36.
Contour defects resulting in deformity caused by lack of tissue can be improved by conventional surgery using autologous tissue, but there is always a donor site morbidity. Integra has been available since the early 1980's for use in acute burns and more recently in reconstruction. It has been shown histologically to act as a tissue regeneration template. The regenerated dermis is buried under an autologous thin split-skin graft. In this study, the principle of burying Integra (without the silicone layer) has been applied to deep tissue defects in 12 reconstructive cases. Such regenerated tissues survive at least 3 years after burying. Modification to the technique to avoid visible edges are being developed. 相似文献
37.
38.
39.
R H Green C E Brightling S McKenna B Hargadon N Neale D Parker C Ruse I P Hall I D Pavord 《The European respiratory journal》2006,27(6):1144-1151
There is increasing evidence that the assessment of eosinophilic airway inflammation using induced sputum and measurement of airway hyperresponsiveness provides additional, clinically important information concerning asthma control. The aim of this study was to directly compare the effects of different treatments on these markers in patients with asthma and persistent symptoms, despite the use of low-dose inhaled corticosteroids. A double-blind four-way crossover study was performed, which compared a 1-month treatment with budesonide 400 mug b.i.d., additional formoterol, additional montelukast and placebo in 49 patients with uncontrolled asthma despite budesonide 100 mug b.i.d., with each treatment separated by a 4-week washout period. The change in sputum eosinophil count with formoterol (2.4 to 3.8% change, 0.6-fold reduction, 95% confidence interval (CI) 0.5-0.9) differed significantly from placebo (2.8 to 2.5% change, 1.1-fold reduction, 95% CI 0.7-1.6) and high-dose budesonide (2.7 to 1.6% change, 1.6-fold reduction, 95% CI 1.2-2.2). The effects of montelukast did not differ from placebo. The changes in methacholine airway responsiveness were small and did not differ between treatments. High-dose budesonide had the broadest range of beneficial effects on other outcomes, including symptom scores, morning peak expiratory flow and forced expiratory volume in one second. In conclusion, treatment given in addition to low-dose inhaled corticosteroids results in modest benefits. Formoterol and high-dose budesonide have contrasting effects on eosinophilic airway inflammation. 相似文献
40.
J Müller-Quernheim K I Gaede E Fireman G Zissel 《The European respiratory journal》2006,27(6):1190-1195
An increase in chronic beryllium disease (CBD) has been suggested due to higher industrial use of beryllium alloys. Since occupational CBD is a perfect phenocopy of sarcoidosis, it might be misdiagnosed as sarcoidosis. In the current it was hypothesised that CBD exists in cohorts of sarcoidosis patients. In a prospective case study, sarcoidosis patients were evaluated for potential beryllium exposure. In those patients in whom beryllium exposure was confirmed and beryllium hypersensitivity demonstrated, the diagnosis of sarcoidosis was rejected and corrected to CBD. In 84 patients seen for re-evaluation or making a diagnosis of sarcoidosis, beryllium exposure was recognised and a diagnosis of CBD was made in 34 out of 84 patients. The time lag between clinical diagnosis of sarcoidosis and the final diagnosis of CBD ranged 0-18 yrs (median 3 yrs) and the mean (range) age at time of diagnosis of CBD was 43.9(25-80) yrs. Beryllium-contaminated workplaces causing disease encompassed a wide spectrum of industries and technical trades in which beryllium-exposure is generally not perceived as a health hazard. In conclusion, chronic beryllium disease still belongs to the spectrum of differential diagnoses of granulomatous disorders. 相似文献