全文获取类型
收费全文 | 8697篇 |
免费 | 757篇 |
国内免费 | 26篇 |
专业分类
耳鼻咽喉 | 114篇 |
儿科学 | 328篇 |
妇产科学 | 199篇 |
基础医学 | 918篇 |
口腔科学 | 384篇 |
临床医学 | 898篇 |
内科学 | 1642篇 |
皮肤病学 | 98篇 |
神经病学 | 768篇 |
特种医学 | 400篇 |
外国民族医学 | 1篇 |
外科学 | 1178篇 |
综合类 | 197篇 |
一般理论 | 9篇 |
预防医学 | 886篇 |
眼科学 | 275篇 |
药学 | 584篇 |
中国医学 | 21篇 |
肿瘤学 | 580篇 |
出版年
2021年 | 90篇 |
2020年 | 83篇 |
2019年 | 97篇 |
2018年 | 115篇 |
2017年 | 107篇 |
2016年 | 104篇 |
2015年 | 123篇 |
2014年 | 159篇 |
2013年 | 253篇 |
2012年 | 299篇 |
2011年 | 373篇 |
2010年 | 239篇 |
2009年 | 210篇 |
2008年 | 362篇 |
2007年 | 437篇 |
2006年 | 406篇 |
2005年 | 389篇 |
2004年 | 389篇 |
2003年 | 331篇 |
2002年 | 343篇 |
2001年 | 321篇 |
2000年 | 314篇 |
1999年 | 268篇 |
1998年 | 114篇 |
1997年 | 118篇 |
1996年 | 105篇 |
1995年 | 89篇 |
1994年 | 103篇 |
1993年 | 95篇 |
1992年 | 264篇 |
1991年 | 242篇 |
1990年 | 217篇 |
1989年 | 191篇 |
1988年 | 194篇 |
1987年 | 177篇 |
1986年 | 173篇 |
1985年 | 160篇 |
1984年 | 124篇 |
1983年 | 124篇 |
1982年 | 89篇 |
1981年 | 63篇 |
1980年 | 59篇 |
1979年 | 88篇 |
1978年 | 79篇 |
1977年 | 57篇 |
1976年 | 61篇 |
1974年 | 59篇 |
1973年 | 82篇 |
1971年 | 60篇 |
1969年 | 53篇 |
排序方式: 共有9480条查询结果,搜索用时 31 毫秒
11.
12.
用健康信念模式设计健康教育项目 总被引:7,自引:2,他引:5
根据健康信念模式,有4个关键因素会影响人们的行为改变.在设计健康教育项目时我们应该考虑每一个因素.无论一个人是采取预防行为还是开始一个治疗过程,他/她都会根据他们对每一个因素的认知来决定他们未来的行为.这4个因素分别是:易感性、严重性、益处和障碍. 相似文献
13.
K.A. Eaton F.M. Rimini E. Zak D.J. Brookman L.M.A. Hopkins P. J. Carmell LG. Yates C. A. Morrice B.A. Lall H. N. Newman 《Journal of clinical periodontology》1997,24(3):189-197
Abstract Several previous studies have evaluated the effects of 0.12% chlorhexidine digluconate (ChD) mouthrinses on plaque and gingival inflammation. However, previously, none have been based in general dental practices. The aim of this study was to evaluate the potential to conduct controlled periodontal clinical trials in co-operation with general dental practitioners (gdps). The project took place in 5 general dental practices in the South of England. 121 healthy subjects (24 at 4 sites and 25 at the 5th). aged 18-65 years, mean 35 ± 12) years participated in a double-blind, randomised study during which they received full mouth assessments for plaque and gingival bleeding at baseline, 6 and 12 weeks. 60 subjects were randomly asigned to use the 0.12% ChD mouth wash and 6i the placebo. The assessments were carried out by 5 gpds, who had previously achieved inter-examiner κ scores of 0.78–0.85 (mean 0.81) for the plaque index (PlI), and of 0.73–0.94 (mean 0.87) for a modified gingival index (mGI), and who maintained κ scores of 0.51–0.90 for PII and of 0.73–1.00 for mGI during the 12 months required to complete the study. 98 subjects (48 ChD and 50 placebo) completed the study. Even though the baseline levels of plaque and gingivitis were low, by week 12, mean whole mouth piaque score of the ChD mouthwash users had fallen from 1.33 at baseline to 0.96 and was significantly lower (p < 0.001) than for the placebo users, 1.31 at baseline to 1.13. Whole-mouth gingival bleeding score fell from 0.56 to 0.42 in the ChD mouthwash group but was unchanged (0.54–0.55) in the placebo group. A subsidiary data analysis which considered the effects at sites indicated that within these overall differences, the ChD users experienced almost 2× the reduction from plaque score 2 at baseline at proximal molar sites over a 12-week period (50.6% ChD versus 27.6% placebo). It was concluded that 0.12% ChD mouthwash reduced plaque accumulation fay 28% and gingival inflammation by 25% over a 12–week period, that it is feasible for a group of gdps to maintain high levels of inter–examiner consistency in the use of PlI and mGI, that it is also feasible to carry out such a multicentre study in general dental practice, and that the use of mean mouth scores per subject to analyse the effects of mouthrinses may well mask variations in response throughout the mouth. 相似文献
14.
Pharmacokinetics of high-dose etoposide 总被引:1,自引:0,他引:1
E M Newman J H Doroshow S J Forman K G Blume 《Clinical pharmacology and therapeutics》1988,43(5):561-564
The pharmacokinetics of etoposide at doses of 1 gm/m2 to 3 gm/m2 were studied in patients with hematologic malignancies. The noncompartmental systemic clearance, mean residence time, steady-state volume of distribution, and elimination half-life were independent of the dose of etoposide, whereas the AUC was proportional to the dose. Comparison of these results with those reported previously indicates that etoposide exhibits linear pharmacokinetics over a thirtyfold range in doses (0.1 to 3 gm/m2). 相似文献
15.
S P Newman G Woodman F Morén S W Clarke 《British journal of diseases of the chest》1988,82(3):262-267
Metered dose inhalers are sometimes used in conjunction with NebuhalerR, a 750 ml holding chamber, but the permissible delay time between actuating the aerosol into Nebuhaler and commencing inhalation is unknown. We have compared in 10 asthmatic patients the bronchodilator responses following inhalations of terbutaline sulphate from Nebuhaler after delays of 1, 5 and 30 seconds and following placebo inhalation. Terbutaline sulphate was administered as 2 puffs, each of 250 micrograms, separated by approximately 15 minutes. After each delay time, terbutaline produced increases in forced expiratory volume in one second (FEV1), peak expiratory flow rate (PEFR) and maximum expiratory flow following exhalation of 75% of the forced vital capacity (V max25) significantly greater than those after placebo (P less than 0.01). Changes in PEFR did not vary significantly among the three delay times, but the increases in FEV1 and in V max25 were significantly reduced with 30 seconds' delay. It is concluded that the delay between actuation into Nebuhaler and commencing inhalation can be extended from 1 second to 5 seconds without significant loss of drug efficacy, and that further extension to 30 seconds causes only a small loss of bronchodilatation: hence the delay time is unlikely to be of major importance in clinical practice. 相似文献
16.
17.
J G Williams B M Newman J L Sutphen J Madison H Frierson J McIlhenny 《Journal of pediatric surgery》1990,25(12):1250-1252
This report describes a 3-year-old child with a hepatobiliary cystadenoma. Cystadenomas are benign, multilocular, cystic neoplasms that usually occur in middle-aged women. The patients may be asymptomatic, but often there are vague abdominal complaints related to extrinsic compression of the stomach, duodenum, or biliary tree. Recurrence following incomplete excision and the presence of carcinoma within otherwise benign cysts has been documented. Complete resection is the therapy of choice, and thorough histopathologic evaluation is imperative. 相似文献
18.
Pleural cryptococcosis is extremely rare. We report the first case of cryptococcal pleural effusion in association with the acquired immune deficiency syndrome. Pleural effusion without the evidence of pulmonary parenchymal involvement was the initial and only clinical finding leading to the diagnosis of disseminated cryptococcosis. The pleural effusion resolved spontaneously prior to amphotericin B therapy. 相似文献
19.
J W Shore C T Westfall C R Leone R K Newman F W Shagets 《Ophthalmic plastic and reconstructive surgery》1987,3(1):13-15
A 38-year-old man presented with hyperophthalmia, enophthalmos, and upper eyelid retraction 18 months following an osteoplastic flap and frontal sinus obliteration for mucocele. Computerized tomography confirmed the presence of frontal bone absorption in the roof of the orbit with traction and elevation of the orbital contents into the obliterated frontal sinus. A fracture of the orbital roof with penetration of periorbita at the time of original surgery was the suspected precipitating cause of the complication. Surgical management included lysis of the cicatrix between the orbit and frontal sinus and interposition of a silicone sheet between the orbit and sinus, which restored the appropriate anatomic relationships and prevented recurrence. 相似文献
20.
The effect of light intensity on double bond conversion and flexural strength of a model, unfilled dental resin. 总被引:4,自引:0,他引:4
Lale G Lovell Sheldon M Newman Matthew M Donaldson Christopher N Bowman 《Dental materials》2003,19(6):458-465
OBJECTIVE: Two visible light sources (tungsten-quartz-halogen and xenon-arc plasma) with vastly different intensities (200 and 1800 mW/cm(2)) but similar spectral outputs, were used to examine the effects of light intensity on conversion and flexural strength of a model dental resin formulation (75/25wt% bis-GMA/TEGDMA). METHODS: The exact same polymer samples were used to correlate double bond conversion (measured with near-IR spectroscopy) to flexural strength, both immediately after light exposure and after storage. RESULTS: In general, polymers which were irradiated with the high light intensity source exhibited greater double bond conversion. However, increasing the light intensity also increased the maximum temperature reached during polymerization. Therefore, the greater double bond conversion was caused by a combination of both photo and thermal effects. Regardless of the light intensity, a single linear relationship existed between conversion and final flexural strength (measured 4 days after cure) over the conversion range analyzed (50-80%). However, deviations from linearity were noted in several samples that were tested immediately after exposure. SIGNIFICANCE: These findings illustrate that light intensity does not affect the final flexural strength of a dental resin as long as the final conversions are similar. 相似文献