全文获取类型
收费全文 | 31148篇 |
免费 | 1509篇 |
国内免费 | 106篇 |
专业分类
耳鼻咽喉 | 484篇 |
儿科学 | 1689篇 |
妇产科学 | 738篇 |
基础医学 | 3306篇 |
口腔科学 | 776篇 |
临床医学 | 1814篇 |
内科学 | 6523篇 |
皮肤病学 | 853篇 |
神经病学 | 1886篇 |
特种医学 | 1001篇 |
外科学 | 4619篇 |
综合类 | 846篇 |
现状与发展 | 1篇 |
一般理论 | 20篇 |
预防医学 | 1439篇 |
眼科学 | 1528篇 |
药学 | 2741篇 |
1篇 | |
中国医学 | 206篇 |
肿瘤学 | 2292篇 |
出版年
2023年 | 198篇 |
2022年 | 509篇 |
2021年 | 1054篇 |
2020年 | 500篇 |
2019年 | 678篇 |
2018年 | 879篇 |
2017年 | 616篇 |
2016年 | 764篇 |
2015年 | 768篇 |
2014年 | 1195篇 |
2013年 | 1446篇 |
2012年 | 2095篇 |
2011年 | 2300篇 |
2010年 | 1260篇 |
2009年 | 1061篇 |
2008年 | 1599篇 |
2007年 | 1662篇 |
2006年 | 1648篇 |
2005年 | 1469篇 |
2004年 | 1333篇 |
2003年 | 1158篇 |
2002年 | 1062篇 |
2001年 | 763篇 |
2000年 | 743篇 |
1999年 | 592篇 |
1998年 | 273篇 |
1997年 | 206篇 |
1996年 | 172篇 |
1995年 | 173篇 |
1994年 | 146篇 |
1993年 | 128篇 |
1992年 | 384篇 |
1991年 | 401篇 |
1990年 | 357篇 |
1989年 | 345篇 |
1988年 | 292篇 |
1987年 | 256篇 |
1986年 | 239篇 |
1985年 | 238篇 |
1984年 | 176篇 |
1983年 | 142篇 |
1981年 | 103篇 |
1979年 | 163篇 |
1978年 | 98篇 |
1977年 | 84篇 |
1975年 | 84篇 |
1974年 | 102篇 |
1973年 | 92篇 |
1972年 | 119篇 |
1970年 | 80篇 |
排序方式: 共有10000条查询结果,搜索用时 0 毫秒
11.
Exacerbation of Partial Seizures and Onset of Nonepileptic Myoclonus with Carbamazepine 总被引:4,自引:3,他引:1
A child had two to three generalized tonic-clonic (GTC) seizures per week unresponsive to phenobarbital (PB) and valproate (VPA). Interictal EEG demonstrated left occipital spikes. When carbamazepine (CBZ) therapy was started, he developed very frequent (4-6/day) complex partial seizures (CPS) characterized on ictal EEG by focal right temporal lobe discharges. The seizure exacerbation, which was associated with development of nonepileptic, multifocal myoclonus, resolved 24 h after CBZ was discontinued. The exacerbation occurred with therapeutic CBZ serum levels, but may have been related to the toxic levels of carbamazepine-10, 11-epoxide (CBZE). 相似文献
12.
Herniation of a thoracic disc in an acromegalic giant is reported. Degenerative changes in the spine in association with dorsal kyphosis, and the additional strain, resulted in the disc prolapse. 相似文献
13.
J H Newcorn J M Halperin J M Healey J D O'Brien D M Pascualvaca L E Wolf A Morganstein V Sharma J G Young 《Journal of the American Academy of Child and Adolescent Psychiatry》1989,28(5):734-738
To assess the relationship between the DSM-III criteria for attention deficit disorder with hyperactivity (ADDH) and the DSM-III-R criteria for attention-deficit hyperactivity disorder (ADHD), children from an inner city parochial school were evaluated using a 30-item teacher questionnaire consisting of the DMS-III and DSM-III-R criteria for these disorders, the revised Conners Parent and Teacher Questionnaires, and a continuous performance test. Diagnostic groups were established based on teacher ratings of the DSM items and evaluated in relation to the rating scale data and continuous performance test. While children who were identified by teachers as having ADDH almost always satisfied the criteria for ADHD, a new group of children who were hyperactive and impulsive but less clearly inattentive also met the criteria for ADHD. Implications of the change in diagnostic criteria are discussed. 相似文献
14.
Sukumaran Anil 《Indian journal of dental research》2006,17(4):151-154
BACKGROUND: Diabetes mellitus is considered as a risk factor for the initiation and progression of periodontal disease. The diabetic patients often exhibit decreased immune response and increased susceptibility to infection. In the present study, a quantitative estimation of the gingival tissue immunoglobulin concentrations in diabetic and non diabetic subjects with periodontitis was assessed and compared with that of clinically healthy gingiva. METHOD: 40 gingival tissue samples obtained from 20 diabetic (Type 2) and 20 non-diabetic subjects were subjected to quantitative estimation of immunoglobulins G, A, and M. The data thus obtained were compared to the level of immunoglobulin found in clinically healthy gingiva. RESULTS: The IgG and IgA level in the tissues of both diabetic and non-diabetic subjects with periodontitis were found to be significantly higher than that of healthy subjects. The diabetic group also showed a significantly higher IgG and IgA levels compared to the non-diabetic group with periodontitis. CONCLUSION: These findings support the concept that the humoral immune response plays an important role in the pathogenesis of periodontal disease in diabetics. The significantly higher levels of immunoglobulin in the gingival tissues might be a protective mechanism against the increased bacterial challenge in diabetic subjects. 相似文献
15.
SETTING: Homes in Delhi, India. OBJECTIVE: To study the reach of mass media campaigns and their impact on awareness about tuberculosis (TB) control among homemakers/housewives. DESIGN: A community-based cross-sectional survey among homemakers residing in Delhi for more than 6 months. RESULTS: Of a total of 920 women interviewed, about 74.2% had seen specific TB-related health messages in one or more of the mass media. The maximum number of subjects could recall having seen billboards or television campaigns. The percentage of respondents who had correct information about various aspects of the disease was higher among those who had seen TB campaigns on any of the mass media. The effectiveness of radio and newsprint in communicating TB messages was found to be more limited than that of television and billboards. CONCLUSION: The mass media can be effective in getting messages about TB across to the community of women who are homemakers, especially in developing countries. In view of our findings, it may be recommended that television and billboards be used as tools for reaching out to them with specific campaigns regarding TB control, and that the use of these media should be strengthened further. 相似文献
16.
L. K. Kochhar V. K. Shukul Rahul Sharma 《Indian journal of otolaryngology and head and neck surgery》2004,56(1):49-50
All penetrating neck wounds are potentially very dangerous and require emergency treatment. The choice of treatment for the
stable patient remains controversial, a number of studies encouraging mandatory surgical exploration and a similar number
encourage selective surgical exploration. Knowledge of the physical properties of the penetrating object or weapon can help
to determine a treatment plan and predict the risk of injury- All tracheal and esophageal injuries with structural damage
should be repaired primarily. A case of Gun Shot Wound Neck was air evacuated to Army Hospital R & R Delhi Cantt in a tracheostomised
state. Patient was evaluated in detail, he had trachea esophageal fistula. The management of this case is discussed along
with principles of management of war injuries. 相似文献
17.
18.
19.
George T Timberlake Manjo K Sharma Denise V Gobert Joseph H Maino 《Optometry and vision science》2003,80(11):772-777
PURPOSE: The Rodenstock scanning laser ophthalmoscope (SLO) is useful for mapping retinal function and for developing and evaluating visual rehabilitation methods. It is essential to know the visual angle subtended by stimuli in the SLO laser-beam raster and to accurately measure angular distances between objects in the final SLO image. To accomplish this, the angular extent of the SLO laser-beam raster must be calibrated. METHODS: We developed a simple method and apparatus for calibrating the raster and used it for repeated calibrations during a 3-month period. RESULTS: The laser-beam raster is quite stable in shape and size, but it is trapezoidally distorted in the vertical direction. Consequently, SLO images are distorted. CONCLUSIONS: Trapezoidal distortion of the SLO laser-beam raster can cause stimulus size to change as much as 10% from the top to the bottom of the raster. Measurements of fixed horizontal retinal landmark distances in SLO images can also vary as much as 10%. We developed a straightforward mathematical method for correcting distortion in SLO image measurements. 相似文献
20.
Arteriovenous (AV) fistulas are common in renal cell carcinoma. These are usually small and asymptomatic. Case reports have previously described symptomatic fistulas in primary renal cell tumour or, less commonly, bone metastases. The current study describes a patient with lung metastases from renal cell carcinoma who developed a symptomatic pulmonary AV fistula. The patient presented with debilitating progressive shortness of breath, which resolved after coiling of the pulmonary AV fistula. Supporting radiographs include a unique ventilation-perfusion finding of perfusion tracer in the kidney that is diagnostic of a pulmonary shunt. This is the first report of a pulmonary fistula from renal cell carcinoma. This rare complication of renal cell carcinoma reflects its diverse clinical presentations and unique tumour biology. 相似文献