全文获取类型
收费全文 | 2346340篇 |
免费 | 175027篇 |
国内免费 | 3319篇 |
专业分类
耳鼻咽喉 | 32049篇 |
儿科学 | 75892篇 |
妇产科学 | 62685篇 |
基础医学 | 348167篇 |
口腔科学 | 63620篇 |
临床医学 | 211342篇 |
内科学 | 457272篇 |
皮肤病学 | 51727篇 |
神经病学 | 185262篇 |
特种医学 | 88008篇 |
外国民族医学 | 489篇 |
外科学 | 353861篇 |
综合类 | 47508篇 |
现状与发展 | 12篇 |
一般理论 | 848篇 |
预防医学 | 182730篇 |
眼科学 | 54325篇 |
药学 | 175095篇 |
11篇 | |
中国医学 | 4575篇 |
肿瘤学 | 129208篇 |
出版年
2021年 | 18978篇 |
2019年 | 19537篇 |
2018年 | 27058篇 |
2017年 | 20357篇 |
2016年 | 22746篇 |
2015年 | 25639篇 |
2014年 | 36094篇 |
2013年 | 53954篇 |
2012年 | 74676篇 |
2011年 | 79405篇 |
2010年 | 47055篇 |
2009年 | 44565篇 |
2008年 | 74607篇 |
2007年 | 79475篇 |
2006年 | 80293篇 |
2005年 | 77777篇 |
2004年 | 74365篇 |
2003年 | 71689篇 |
2002年 | 69364篇 |
2001年 | 108737篇 |
2000年 | 111450篇 |
1999年 | 93494篇 |
1998年 | 26990篇 |
1997年 | 23658篇 |
1996年 | 24054篇 |
1995年 | 22716篇 |
1994年 | 20893篇 |
1993年 | 19712篇 |
1992年 | 72001篇 |
1991年 | 70069篇 |
1990年 | 68393篇 |
1989年 | 65665篇 |
1988年 | 60302篇 |
1987年 | 59128篇 |
1986年 | 55217篇 |
1985年 | 53005篇 |
1984年 | 39311篇 |
1983年 | 33396篇 |
1982年 | 19858篇 |
1979年 | 35867篇 |
1978年 | 25651篇 |
1977年 | 21230篇 |
1976年 | 20332篇 |
1975年 | 21817篇 |
1974年 | 26148篇 |
1973年 | 24802篇 |
1972年 | 23200篇 |
1971年 | 22037篇 |
1970年 | 20247篇 |
1969年 | 19315篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
961.
R. De Zotti V. Patussi A. Fiorito F. Larese 《International archives of occupational and environmental health》1988,61(1-2):7-12
Summary Dock workers (n = 218) occupationally exposed to green coffee beans (GCB) were studied, using a specific questionnaire for allergic symptoms and skin tests for common and occupational allergens. Thirty-one workers (14.3%) complained of allergic symptoms of the eye, nose and bronchial system at the workplace. The prick tests, using both commercial allergens and specific extracts prepared from the most common types of coffee and their corresponding sacks, confirmed a sensitization in 21 workers (9.6%). A positive skin reaction to castor beans (CB) was found in nearly all these cases; in ten workers there was also a positive reaction to GCB allergens and in 14 cases prick tests were positive to extracts of sacks. There was a good concordance between prick tests and specific IgE for CB (95.0%) and also, but to a lesser extent, for GCB. The authors concluded that there is a significant risk of sensitization to CB and GCB allergens in dock workers occupied in handling green coffee bean, despite the fact that the exposure is not continuous. CB emerged as a common contaminant of GCB from various countries. For effective prevention, a modification of the methods of transport is required to avoid CB contamination to other products. Eliminating environmental dust during shipping operations is the most important preventive measure and it can be achieved by the use of containers, as some exporting countries are already doing. 相似文献
962.
963.
D Bild L S Geiss S M Teutsch B Gabella B A Hudspeth R M Schubert C W Gollmar D J Kaplan F A Connell J C Will 《Journal of clinical epidemiology》1988,41(10):999-1006
The pilot study for a sentinel health events surveillance system for deaths among persons under age 45 with diabetes was conducted in six states in 1984 and 1985. Two hundred and thirty-three events were identified. Information from death certificates, physicians, and families revealed that 22% died from acute complications of diabetes and 53% from chronic complications. Blood pressure measurement and urinalysis testing had been performed in the last year for almost all of the decedents, but other preventive practices were reported less frequently. Hypertension was present in 57% and of those, was not controlled in 73%. Forty-four percent were cigarette smokers at the time of death. Agreement between physicians and families was generally higher for clinical conditions than for care practices. This surveillance system appears to yield information about the health care of persons with diabetes not readily available from other sources, although modifications may be necessary before implementation. 相似文献
964.
M D Silverstein D A Albert N M Hadler M W Ropes 《Journal of clinical epidemiology》1988,41(7):623-633
965.
The sodium, potassium and creatinine contents of three non-consecutive 24-h urine samples collected by 34 selected adult individuals (10 m; 24 f) living in Cork City were determined. The pooled mean 24-h excretion of sodium and potassium in collections adjudged to be complete were 152 mmol and 78 mmol, respectively. There was no significant difference between group average weekday and weekend-day excretion of Na or K, for either males or females. This suggests that weekend 24-h urinary collections, which most subjects find more convenient, are suitable for studies of sodium and potassium intakes of groups. The ratios of intra- to inter-individual variation for 24-h urinary sodium were 1.4 and 2.1 for males and females, respectively. The corresponding ratios for 24-h urinary potassium were 6.6 for males and 4.9 for females. These ratios indicated that there were large individual day-to-day variations in urinary sodium and potassium excretion in this group. It was estimated that a sample size of 35-60 individuals would be required to estimate group mean sodium and potassium intakes by means of single 24-h urine collections. 相似文献
966.
Internal eye wall resection in the management of uveal melanoma 总被引:3,自引:0,他引:3
G A Peyman H Charles 《Canadian journal of ophthalmology. Journal canadien d'ophtalmologie》1988,23(5):218-223
Twenty patients with presumed uveal melanoma underwent internal eye wall resection. It was the primary procedure in 13 patients who had tumours within 2 disc diameters of the optic nerve head and was combined with external resection in the remainder. Malignant melanoma was confirmed histologically in 15 patients; the diagnosis was a benign tumour in the other 5. The length of follow-up ranged from 2 to 37 (mean 19) months. In all cases the retina was completely attached at the time of last examination. The visual acuity ranged from 20/40 to hand movements; nine patients had an acuity of 20/400 or better. At the time of writing no metastatic disease or local recurrence had developed in any of the 15 patients in whom malignant melanoma was diagnosed. 相似文献
967.
We examined six patients with Gardner's syndrome, eight first-degree relatives, and 31 age- and sex-matched controls to document the presence, distribution, and morphologic features of congenital hypertrophy of the retinal pigment epithelium. Patients with Gardner's syndrome had multiple, bilateral lesions, with 288 of 346 foci (83%) located posterior to the equator. Linear-shaped congenital hypertrophy of the retinal pigment epithelium, a distinctive finding in these patients, accounted for 44 of 140 large lesions (31%). Despite multifocal fundus involvement, results of electro-oculography were normal in all eyes tested. 相似文献
968.
A Watanabe K Ohizumi M Motomiya K Takeuchi T Yoshida S Ida Y Miura K Nishioka Y Tanno T Takishima 《The Japanese journal of antibiotics》1990,43(8):1392-1401
We evaluated the therapeutic efficacy of miconazole (MCZ, Florid-F inj.), a new antifungal agent for parenteral use, in deep-seated fungal infections of respiratory tract system. A daily dose of 400-1,800 mg of MCZ was given intravenously for 12-38 days (mean: 23.4 days) to 7 patients: 2 patients with pulmonary aspergillosis, 1 patient with bronchial aspergillosis, 1 patient with pulmonary candidiasis and 3 patients with candidemia. One additional patient with pulmonary aspergillosis received three instillations of 20 mg of MCZ into the thoracic cavity. The clinical effects were excellent in 1, good in 4 and poor in 3 patients. The efficacy rate was 100% in 5 cases with respiratory fungal infections but 3 cases with candidemia did not respond well to the treatment. Four strains each of Aspergillus sp. and Candida sp. were identified as causative organisms. Seven of the 8 strains were eradicated by administration of MCZ. Side effects observed were irritation and heat in a leg in 1 patient, hyperlipoidemia in 2 patients and eosinophilia in 1 patient. The adverse reactions disappeared after the completion of the therapy. From the above results, we conclude that MCZ is one of the most useful antifungal agents for parenteral use as a first choice on deep-seated fungal infections in the respiratory tract. 相似文献
969.
970.