全文获取类型
收费全文 | 15807篇 |
免费 | 1107篇 |
国内免费 | 22篇 |
专业分类
耳鼻咽喉 | 193篇 |
儿科学 | 493篇 |
妇产科学 | 325篇 |
基础医学 | 2168篇 |
口腔科学 | 199篇 |
临床医学 | 2012篇 |
内科学 | 3255篇 |
皮肤病学 | 259篇 |
神经病学 | 1688篇 |
特种医学 | 405篇 |
外国民族医学 | 2篇 |
外科学 | 1657篇 |
综合类 | 162篇 |
一般理论 | 12篇 |
预防医学 | 1803篇 |
眼科学 | 370篇 |
药学 | 1016篇 |
中国医学 | 38篇 |
肿瘤学 | 879篇 |
出版年
2023年 | 101篇 |
2022年 | 177篇 |
2021年 | 428篇 |
2020年 | 221篇 |
2019年 | 358篇 |
2018年 | 385篇 |
2017年 | 321篇 |
2016年 | 336篇 |
2015年 | 361篇 |
2014年 | 557篇 |
2013年 | 749篇 |
2012年 | 1201篇 |
2011年 | 1228篇 |
2010年 | 612篇 |
2009年 | 594篇 |
2008年 | 1016篇 |
2007年 | 1029篇 |
2006年 | 1005篇 |
2005年 | 1001篇 |
2004年 | 992篇 |
2003年 | 907篇 |
2002年 | 818篇 |
2001年 | 153篇 |
2000年 | 123篇 |
1999年 | 174篇 |
1998年 | 174篇 |
1997年 | 130篇 |
1996年 | 133篇 |
1995年 | 114篇 |
1994年 | 93篇 |
1993年 | 89篇 |
1992年 | 85篇 |
1991年 | 102篇 |
1990年 | 81篇 |
1989年 | 71篇 |
1988年 | 75篇 |
1987年 | 86篇 |
1986年 | 88篇 |
1985年 | 77篇 |
1984年 | 68篇 |
1983年 | 50篇 |
1982年 | 46篇 |
1981年 | 52篇 |
1980年 | 50篇 |
1979年 | 41篇 |
1978年 | 30篇 |
1977年 | 32篇 |
1976年 | 33篇 |
1975年 | 40篇 |
1974年 | 30篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
51.
Robin M Heidemann Mark A Griswold Nicole Seiberlich Mathias Nittka Stephan A R Kannengiesser Berthold Kiefer Peter M Jakob 《Magnetic resonance in medicine》2007,57(6):1037-1046
MRI with non-Cartesian sampling schemes can offer inherent advantages. Radial acquisitions are known to be very robust, even in the case of vast undersampling. This is also true for 1D non-Cartesian MRI, in which the center of k-space is oversampled or at least sampled at the Nyquist rate. There are two main reasons for the more relaxed foldover artifact behavior: First, due to the oversampling of the center, high-energy foldover artifacts originating from the center of k-space are avoided. Second, due to the non-equidistant sampling of k-space, the corresponding field of view (FOV) is no longer well defined. As a result, foldover artifacts are blurred over a broad range and appear less severe. The more relaxed foldover artifact behavior and the densely sampled central k-space make trajectories of this type an ideal complement to autocalibrated parallel MRI (pMRI) techniques, such as generalized autocalibrating partially parallel acquisitions (GRAPPA). Although pMRI can benefit from non-Cartesian trajectories, this combination has not yet entered routine clinical use. One of the main reasons for this is the need for long reconstruction times due to the complex calculations necessary for non-Cartesian pMRI. In this work it is shown that one can significantly reduce the complexity of the calculations by exploiting a few specific properties of k-space-based pMRI. 相似文献
52.
Stéphane Aubert Roland Henaine Olivier Raisky Nicolas Chavanis Jacques Robin René Ecochard Jean Ninet 《European journal of cardio-thoracic surgery》2005,28(2):223-228
OBJECTIVE: We consider the short- and long-term outcomes of the repair of the isolated partial atrioventricular (AV) septal defect to determine the role played by the atypical forms on the initial AV valve replacement and on the risk of reoperation. METHODS: Two hundred and eight patients underwent an operation for this malformation between 1974 and 2001. Clinical and echocardiographic examinations were performed on all patients, the AV valve regurgitation was graded from 1 to 4 and a residual interatrial shunt was sought. Median age at the intervention was 5.8 years (3 months to 67 years). RESULTS: Median follow-up time was 7.5 years (range 0-22.6 years). The cumulative 30-day, 5- and 20-year survival rates were 96.5, 95.4 and 94.6%, respectively. AV valve replacement was associated with a high mortality (P<0.001). A reoperation was performed on 12 patients (5.7%) including six patients within less than a 30-day period, especially to repair residual AV valve regurgitation. We performed four AV valve repairs by annuloplasty and six AV valve replacements. Two patients who had initially undergone an AV valve replacement underwent a reoperation for valve thrombosis. The cumulative 30-day, 5- and 20-year rates of freedom from reoperation were 96.5, 93.6 and 83%, respectively. An atypical form was present in 24 patients (11.5%) and was a risk factor for initial AV valve replacement (P<0.001) and for reoperation (P<0.001). A complete AV block occurred in 13 patients (6.2%), all of them within a 30-day period. The AV valve replacement was a high risk factor for a complete AV block (P<0.001). At the end of our study 180 patients (96%) were in NYHA I and 8 in NYHA II. CONCLUSIONS: The morbi-mortality of the isolated partial AV septal defect is primarily perioperative and is linked with the presence of an atypical form of the lesion. This atypical form was the main reason for reoperation for AV valve regurgitation. The AV valve replacement was associated with a high mortality and with the occurrence of complete AV block. Using a standardized technique, the AV septal defect can be repaired with excellent long-term clinical and echographic results. 相似文献
53.
54.
Siberian ginseng (Eleutheroccus senticosus) effects on CYP2D6 and CYP3A4 activity in normal volunteers. 总被引:3,自引:0,他引:3
Jennifer L Donovan C Lindsay DeVane Kenneth D Chavin Robin M Taylor John S Markowitz 《Drug metabolism and disposition》2003,31(5):519-522
Siberian ginseng ([SG]; Eleutherococcus senticosus) is a commonly used herbal preparation. The objective of this study was to assess in normal volunteers (n = 12) the influence of a standardized SG extract on the activity of cytochrome P450 CYP2D6 and 3A4. Probe substrates dextromethorphan (CYP2D6 activity) and alprazolam (CYP3A4 activity) were administered orally at baseline and again following treatment with SG (1 x 485 mg twice daily) for 14 days. Urinary concentrations of dextromethorphan and dextorphan were quantified, and dextromethorphan metabolic ratios (DMRs) were determined at baseline and after SG treatment. Likewise, plasma samples were collected (0-60 h) for alprazolam pharmacokinetics at baseline and after SG treatment to assess effects on CYP3A4 activity. Validated high performance liquid chromatography methods were used to quantify all compounds and relevant metabolites. There were no statistically significant differences between pre- and post-SG treatment DMRs indicating a lack of effect on CYP2D6 (P > 0.05). For alprazolam there also were no significant differences in the pharmacokinetic parameters determined by noncompartmental modeling (C(max), T(max), area under the curve, half-life of elimination) indicating that SG does not significantly induce or inhibit CYP3A4 (P > 0.05). Our results indicate that standardized extracts of SG at generally recommended doses for over-the-counter use are unlikely to alter the disposition of coadministered medications primarily dependent on the CYP2D6 or CYP3A4 pathways for elimination. 相似文献
55.
Martin A. Bopp Yiwei Jia Liangquan Li Richard J. Cogdell Robin M. Hochstrasser 《Proceedings of the National Academy of Sciences of the United States of America》1997,94(20):10630-10635
Single light-harvesting complexes LH-2 from Rhodopseudomonas acidophila were immobilized on various charged surfaces under physiological conditions. Polarized light experiments showed that the complexes were situated on the surface as nearly upright cylinders. Their fluorescence lifetimes and photobleaching properties were obtained by using a confocal fluorescence microscope with picosecond time resolution. Initially all molecules fluoresced with a lifetime of 1 ± 0.2 ns, similar to the bulk value. The photobleaching of one bacteriochlorophyll molecule from the 18-member assembly caused the fluorescence to switch off completely, because of trapping of the mobile excitations by energy transfer. This process was linear in light intensity. On continued irradiation the fluorescence often reappeared, but all molecules did not show the same behavior. Some LH-2 complexes displayed a variation of their quantum yields that was attributed to photoinduced confinement of the excited states and thereby a diminution of the superradiance. Others showed much shorter lifetimes caused by excitation energy traps that are only ≈3% efficient. On repeated excitation some molecules entered a noisy state where the fluorescence switched on and off with a correlation time of ≈0.1 s. About 490 molecules were examined. 相似文献
56.
57.
Robert M. Pascuzzi Scott A. Shapiro Aruna N. Rau Charles E. Schultz Robin M. Bowman Karen S. Caldemeyer David S. Wilkes David S. Wilkes 《Journal of neuroimaging》1996,6(1):61-62
A 45-year-old woman with history of iritis, uveitis, and sarcoidosis of the skin presented with a subacute cervical myelopathy. Magnetic resonance imaging (MRI) ;howed patchy, multifocal, gadoliniumenhancing intramedullary lesions of the spinal cord, and extramedullary lesions of the basal cisterns and fourth ventricle. Symptoms and MRI abnormalities were improved within 1 month of corticosteroid therapy. 相似文献
58.
59.
Justin C Wise Rose A Sevcik Robin D Morris Maureen W Lovett Maryanne Wolf 《J. Speech Lang. Hear. Res.》2007,50(4):1093-1109
PURPOSE: Some researchers (F. R. Vellutino, F. M. Scanlon, & M. S. Tanzman, 1994) have argued that the different domains comprising language (e.g., phonology, semantics, and grammar) may influence reading development in a differential manner and at different developmental periods. The purpose of this study was to examine proposed causal relationships among different linguistic subsystems and different measures of reading achievement in a group of children with reading disabilities. METHODS: Participants were 279 students in 2nd to 3rd grade who met research criteria for reading disability. Of those students, 108 were girls and 171 were boys. In terms of heritage, 135 were African and 144 were Caucasian. Measures assessing pre-reading skills, word identification, reading comprehension, and general oral language skills were administered. RESULTS: Structural equation modeling analyses indicated receptive and expressive vocabulary knowledge was independently related to pre-reading skills. Additionally, expressive vocabulary knowledge and listening comprehension skills were found to be independently related to word identification abilities. CONCLUSION: Results are consistent with previous research indicating that oral language skills are related to reading achievement (e.g., A. Olofsson & J. Niedersoe, 1999; H. S. Scarborough, 1990). Results from this study suggest that receptive and expressive vocabulary knowledge influence pre-reading skills in differential ways. Further, results suggest that expressive vocabulary knowledge and listening comprehension skills facilitate word identification skills. 相似文献
60.
Akira Horiuchi Robin A Felder† 《Clinical and experimental pharmacology & physiology》1996,23(S3):150-154
1. In orefer to develop a simple, efficient system for the highlvel expression of dopamine recetors in eukaryotic cells, we have studied the effects of n-butyrate on the expression of rat D1A dopamine receptor cDNA in mouse fibroblast LTK- cells as compared with those of n-butyrate on endogenous D1 receptor levles in opossum kidney cells.
2. In the transfected LTK- cell mebranes with pRc/CMVD1A receptor cDNA, a selective D1 dopamine antagonist, [3 H]-SCH 23390, exhibited a Kd of 0.9 ± 0.1 nmol/L and a Bmax of 0.35 ± 0.05 pmol/mg protien (n = 5).
3. Addtion of n-butrate (2–10 mmol/L) to the culture medium for 48h dose-dependently increased the D1A receptor level up to 1.5 ± 0.3 pmol/mg protien (n = 7), although the Kd values were not affected. The increase in receptor level was accompanined by an elevation of selective D1 agoinist-induced adenyly cyclase activity.
4. In contrast, n-butyrate treatment (2–10 mmol/L) did not affect either endogenous D1 receptor levels or fendoldopmainduced adenylyl cyclase activity in possum kidney cells.
5. These results sugges n-butyrate is a sueful tool for obtaining high-level expression of D1A dopamine receptor cDNA in mouse fibroblast LTK- cells. 相似文献
2. In the transfected LTK- cell mebranes with pRc/CMVD
3. Addtion of n-butrate (2–10 mmol/L) to the culture medium for 48h dose-dependently increased the D
4. In contrast, n-butyrate treatment (2–10 mmol/L) did not affect either endogenous D
5. These results sugges n-butyrate is a sueful tool for obtaining high-level expression of D