全文获取类型
收费全文 | 849166篇 |
免费 | 38860篇 |
国内免费 | 1104篇 |
专业分类
耳鼻咽喉 | 9446篇 |
儿科学 | 26993篇 |
妇产科学 | 17913篇 |
基础医学 | 128379篇 |
口腔科学 | 17084篇 |
临床医学 | 75173篇 |
内科学 | 156763篇 |
皮肤病学 | 15656篇 |
神经病学 | 63707篇 |
特种医学 | 34976篇 |
外国民族医学 | 64篇 |
外科学 | 129628篇 |
综合类 | 11764篇 |
现状与发展 | 2篇 |
一般理论 | 212篇 |
预防医学 | 67089篇 |
眼科学 | 17773篇 |
药学 | 60185篇 |
1篇 | |
中国医学 | 1980篇 |
肿瘤学 | 54342篇 |
出版年
2021年 | 7166篇 |
2019年 | 6916篇 |
2018年 | 30152篇 |
2017年 | 23306篇 |
2016年 | 26485篇 |
2015年 | 9656篇 |
2014年 | 12727篇 |
2013年 | 17782篇 |
2012年 | 32054篇 |
2011年 | 47822篇 |
2010年 | 33869篇 |
2009年 | 25534篇 |
2008年 | 43615篇 |
2007年 | 47865篇 |
2006年 | 27110篇 |
2005年 | 28035篇 |
2004年 | 28008篇 |
2003年 | 27636篇 |
2002年 | 25065篇 |
2001年 | 24707篇 |
2000年 | 25113篇 |
1999年 | 21129篇 |
1998年 | 7284篇 |
1997年 | 6047篇 |
1996年 | 5766篇 |
1995年 | 5421篇 |
1994年 | 4852篇 |
1992年 | 15700篇 |
1991年 | 17047篇 |
1990年 | 17050篇 |
1989年 | 16634篇 |
1988年 | 15245篇 |
1987年 | 15096篇 |
1986年 | 14042篇 |
1985年 | 13540篇 |
1984年 | 10292篇 |
1983年 | 8776篇 |
1982年 | 5112篇 |
1979年 | 9575篇 |
1978年 | 7013篇 |
1977年 | 5672篇 |
1976年 | 6005篇 |
1975年 | 7041篇 |
1974年 | 7945篇 |
1973年 | 7590篇 |
1972年 | 6981篇 |
1971年 | 6597篇 |
1970年 | 6197篇 |
1969年 | 5737篇 |
1968年 | 5406篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
991.
Lyme disease presenting as urinary retention 总被引:1,自引:0,他引:1
We report a case of Lyme disease that presented with urinary retention. The individual then experienced lower extremity paralysis. Paralysis and urinary retention resolved with intravenous ceftriaxone antibiotic. To our knowledge this is the first report of a urological manifestation as the initial clinical presentation of Lyme disease. Recognition of clinical symptoms and urological complications of Lyme disease also are discussed. 相似文献
992.
V M Buianov S S Maskin A N Kovalev A Ia Korovin N Iu Shestakov K E Riabtsev 《Klinichna khirurhiia / Ministerstvo okhorony zdorov'ia Ukra?ny, Naukove tovarystvo khirurhiv Ukra?ny》1990,(1):1-3
Comparative analysis of 3707 operations on the organs of the abdominal cavity has shown the significant advantage of the suggested by the authors method for intraoperative wound protection with latex rubber in combination with placing the longitudinal removable sutures over the subcutis and skin, and dressing-free management of the wounds in prophylaxis of the postoperative purulent wound complications. After 310 operations of different contamination degree performed with the use of the given method, no suppuration of the operative wounds was noted. 相似文献
993.
The authors examined 152 patients with lymphedema of the lower limbs 2-6 years after operation for lymphovenous anastomoses (LVA). They evaluated the dynamics of edema according to Alberton's formula, the changes in the character of the episodes of erysipelas, and the patient's feeling of heaviness in the involved limb. The function of the anastomosis was studied by the radioisotope method. Positive results were recorded in 99 patients. In the remaining patients the LVA did not function and the symptoms of lymphedema did not change or progressed. The effect of LVA was found to be positive in 51 patients in the group of 69 patients with secondary form of lymphedema and in 48 of 83 patients with the primary form of the disease. The last-mentioned was connected with congenital insufficiency of lymph drainage. The condition of the collecting lymphatics is an important factor of LVA efficacy: the effect of LVA was positive in 68 patients in hyperplasia and in 31 patients in hypoplasia of the lymphatics. The results of LVA are improved by regular nonoperative management for the correction of endocrine-immunological and hemostatic factors as well as by stimulation of lymph drainage in the limb and prevention of inflammatory complications. 相似文献
994.
V Popovi? M Arandelovi? M Vracevi? M Popovi? O Momcilovi? D Ili? J Jovanovi? S Jakubi 《Arhiv za higijenu rada i toksikologiju》1990,41(1):35-46
To establish the effects of occupational respiratory noxae on the state of the bronchopulmonary system a study of the working environment and examinations of workers from the electronics industry whose workplaces were near tin baths and in conductor soldering shops were carried out. The following chemical noxae were found to be present in the working environment: lead, tin, calophonium and ethyl alcohol, all in permitted concentrations. Comparison of the state of lung ventilation in workers from the electronics industry (n = 120) and control workers (n = 129) pointed to a major increase in total air flow resistance during calm breathing in the exposed workers. The obstructive changes were mainly localized in the small airways. 相似文献
995.
Air-surgeons of the sanitary aviation department of the Vologda Regional Hospital analysed 279 summons to patients with acute gastrointestinal hemorrhage living in the districts of the region. They came to the conclusion that emergency gastroduodenoscopy allowed air-surgeons to identify the source of the bleeding in 97.64% of patients, determine the rational therapeutic tactics, and reach a well-grounded decision on evacuation of the patients to the regional hospital, as a result of which mortality reduced by more than half. 相似文献
996.
997.
M S Sachdev H Kumar A K RoopJain R Arora V K Dada 《Indian journal of ophthalmology》1990,38(4):184-186
A case of destructive ocular myiasis resulting in complete loss of the globe in two days time is documented. To the best of our knowledge this is the first report of such a severe involvement in a healthy and non-compromised host. Mechanical removal and good local hygiene helped heal the wound. The larvae were isolated to be that of Chrysomyia bezziana (screwworm fly). This is possibly the first report of destructive ocular myiasis caused by Chrysomyia bezziana from the Indian subcontinent and the second in world literature. Infestation of human eyes with larvae of flies (myiasis) has been reported. Serious consequences of destructive myiasis are seen in emaciated and diseased patients. Only one report of total destruction of the globe by maggots of Chrysomyia bezziana exists in the literature. As in previous communications, the patient in this report had no predisposing factors both systemic and local. We here in document a case of orbital myiasis leading to rapid destruction of the globe within two days in a healthy and a non-compromised patient. 相似文献
998.
E. I. Barengolts M. Berman S. C. Kukreja T. Kouznetsova C. Lin E. V. Chomka 《Calcified tissue international》1998,62(3):209-213
Estrogen deficiency is a risk factor for osteoporosis and coronary artery disease. Osteoporosis can be evaluated by measuring
bone mineral density (BMD). Coronary atherosclerotic burden can be evaluated by measuring coronary calcium using electron
beam computed tomography (EBT) of the heart. We compared coronary calcium scores in 45 asymptomatic postmenopausal women with
normal and low BMD. BMD of the lumbar spine and proximal femur was measured by dual X-ray absorptiometry (DXA), and coronary
calcium was measured quantitatively by EBT. Women were divided into control, osteopenia, and osteoporosis groups based on
the T score of the lumbar spine. Women were similar in age, years since menopause, height, weight, and body mass index (BMI).
BMD ± SD (g/cm2) of L1–L4 was 0.96 ± 0.11, 0.83 ± 0.03, and 0.73 ± 0.05, in control, osteopenia, and osteoporosis group, respectively. The
total coronary calcium score ± SD (relative units) was 41.9 ± 83.1, 115.1 ± 181.9, and 221.7 ± 355.4 for control, osteopenia,
and osteoporosis group, respectively; the score was significantly higher in the osteoporosis than in the control group. This
study provides initial data suggesting that women with osteoporosis may have a higher risk of developing coronary atherosclerosis. 相似文献
999.
V Saha S Love T Eden P Micallef-Eynaud G MacKinlay 《Archives of disease in childhood》1993,68(6):771-774
The duration of symptoms before diagnosis (lag time) was defined for 184 of 236 children diagnosed as having a malignancy at the Royal Hospital for Sick Children, Edinburgh for the time period January 1982 until December 1990. The natural logarithm of the lag time was correlated with age, gender, diagnostic group, white cell count in acute leukaemia, clinical stage of disease in solid tumours, and event free survival. Age was significantly associated with lag time, older children presenting later. In the diagnostic groups, mean lag time ranged from 2.8 weeks in nephroblastoma to 13.3 weeks for brain tumours. Diagnostic group was predictive for lag time after adjustment for age, with for example, a significantly longer lag time for those with brain tumours. However lag time was not predictive of event free survival and it is likely that lag time has other major determinants. When compared with previous studies, there also appears to be a regional variation in lag time for diagnostic groups. It seems likely that this is a reflection of geographical difference in the structure of health systems and is therefore yet another important determinant. 相似文献
1000.
Jan E. Zejda Thomas S. Hurst Ernest M. Barber Charles Rhodes James A. Dosman 《American journal of industrial medicine》1993,23(5):743-750
A cross-sectional survey on respiratory health in swine producers showed that 30% of 301 examined men usually used a dust mask when working inside a barn. They did not differ significantly from dust mask nonusers in respect to respiratory symptoms and lung function. This analysis was undertaken to determine whether the respiratory health of dust mask users was associated with reasons why they had started individual respiratory protection. The subjects were recontacted in order to identify those who started using a mask to deliberately prevent symptoms (42 men) and those who started protection because of pre-existing respiratory symptoms (44 men). Not unexpectedly, betweengroup comparisons of respiratory symptoms and lung function suggest that swine producers who wear dust masks for preventive purposes have better respiratory health than those who wear dust masks because of symptoms or those who do not use individual respiratory protection. The individual reasons for starting dust mask usage should be examined among potential determinants of the outcomes of prospective studies which can then provide more valid assessment of the effect of individual respiratory protection. © 1993 Wiley-Liss, Inc. 相似文献