全文获取类型
收费全文 | 736篇 |
免费 | 46篇 |
专业分类
耳鼻咽喉 | 6篇 |
儿科学 | 26篇 |
妇产科学 | 25篇 |
基础医学 | 91篇 |
口腔科学 | 9篇 |
临床医学 | 33篇 |
内科学 | 174篇 |
皮肤病学 | 14篇 |
神经病学 | 67篇 |
特种医学 | 12篇 |
外科学 | 91篇 |
综合类 | 7篇 |
预防医学 | 90篇 |
眼科学 | 3篇 |
药学 | 38篇 |
肿瘤学 | 96篇 |
出版年
2023年 | 5篇 |
2022年 | 11篇 |
2021年 | 19篇 |
2020年 | 13篇 |
2019年 | 13篇 |
2018年 | 20篇 |
2017年 | 19篇 |
2016年 | 16篇 |
2015年 | 15篇 |
2014年 | 21篇 |
2013年 | 23篇 |
2012年 | 49篇 |
2011年 | 49篇 |
2010年 | 20篇 |
2009年 | 17篇 |
2008年 | 36篇 |
2007年 | 49篇 |
2006年 | 47篇 |
2005年 | 42篇 |
2004年 | 29篇 |
2003年 | 27篇 |
2002年 | 43篇 |
2001年 | 31篇 |
2000年 | 13篇 |
1999年 | 17篇 |
1998年 | 4篇 |
1997年 | 3篇 |
1996年 | 8篇 |
1994年 | 2篇 |
1992年 | 12篇 |
1991年 | 10篇 |
1990年 | 10篇 |
1989年 | 9篇 |
1988年 | 4篇 |
1987年 | 10篇 |
1986年 | 6篇 |
1985年 | 11篇 |
1984年 | 4篇 |
1983年 | 7篇 |
1982年 | 2篇 |
1980年 | 4篇 |
1979年 | 3篇 |
1978年 | 2篇 |
1977年 | 2篇 |
1976年 | 5篇 |
1975年 | 2篇 |
1974年 | 2篇 |
1973年 | 6篇 |
1972年 | 2篇 |
1971年 | 2篇 |
排序方式: 共有782条查询结果,搜索用时 15 毫秒
51.
Pérez-Villacastín J Carmona Salinas JR Hernández Madrid A Marín Huerta E Merino Llorens JL Ormaetxe Merodio J Moya i Mitjans A 《Revista espa?ola de cardiología》1999,52(12):1083-1104
Since the first implantation in man in 1980 implantable cardioverter defibrillator technology has greatly improved and the number of devices implanted has increased considerably every year. Non thoracotomy lead systems and biphasic shocks are now the approach of choice, offering an almost 100% success rate. This document reviews the recommendations for qualification of personnel and for the centres implanting and carrying out follow-ups on defibrillators. The current indications for the implantation of implantable cardioverter defibrillator are also addressed. 相似文献
52.
53.
Chajès V Biessy C Byrnes G Deharveng G Saadatian-Elahi M Jenab M Peeters PH Ocké M Bueno-de-Mesquita HB Johansson I Hallmans G Manjer J Wirfält E Jakszyn P González CA Huerta JM Martinez C Amiano P Suárez LR Ardanaz E Tjønneland A Halkjaer J Overvad K Jakobsen MU Berrino F Pala V Palli D Tumino R Vineis P de Magistris MS Spencer EA Crowe FL Bingham S Khaw KT Linseisen J Rohrmann S Boeing H Nöethlings U Olsen KS Skeie G Lund E Trichopoulou A Zilis D Oustoglou E Clavel-Chapelon F Riboli E 《Nutrition and cancer》2011,63(8):1235-1250
Elaidic acid is the main unnatural trans fatty acid isomer occurring during partial hydrogenation of vegetable oils used as ingredients for the formulation of processed foods. The main objective is to assess associations between processed food intakes and plasma phospholipid elaidic acid concentrations within the European Prospective Investigation into Cancer and Nutrition study. A cross-sectional study was used to determine fatty acid profiles in 3,003 subjects from 16 centers. Single 24-h dietary recalls (24-HDR) were collected using a standardized computerized interview program. Food intakes were computed according to their degree of processing (moderately/nonprocessed foods, processed staple foods, highly processed foods). Adjusted ecological and individual correlations were calculated between processed food intakes and plasma elaidic acid levels. At the population level, mean intakes of highly processed foods were strongly correlated with mean levels of plasma elaidic acid in men (P = 0.0016) and in women (P = 0.0012). At the individual level, these associations remained but at a much lower level in men (r = 0.08, P = 0.006) and in women (r = 0.09, P = 0.0001). The use of an averaged 24-HDR measure of highly processed food intakes is adequate for predicting mean levels of plasma elaidic acid among European populations. 相似文献
54.
We analyzed strategies for the use of stockpiled antiviral drugs in the context of a future influenza pandemic and estimated cost-benefit ratios. Current stockpiling of oseltamivir appears to be cost-saving to the economy under several treatment strategies, including therapeutic treatment of patients and postexposure prophylactic treatment of patients' close contacts. 相似文献
55.
Linseisen J Rohrmann S Bueno-de-Mesquita B Büchner FL Boshuizen HC Agudo A Gram IT Dahm CC Overvad K Egeberg R Tjønneland A Boeing H Steffen A Kaaks R Lukanova A Berrino F Palli D Panico S Tumino R Ardanaz E Dorronsoro M Huerta JM Rodríguez L Sánchez MJ Rasmuson T Hallmans G Manjer J Wirfält E Engeset D Skeie G Katsoulis M Oikonomou E Trichopoulou A Peeters PH Khaw KT Wareham N Allen N Key T Brennan P Romieu I Slimani N Vergnaud AC Xun WW Vineis P Riboli E 《Cancer causes & control : CCC》2011,22(6):909-918
Evidence from case-control studies, but less so from cohort studies, suggests a positive association between meat intake and risk of lung cancer. Therefore, this association was evaluated in the frame of the European Prospective Investigation into Cancer and Nutrition, EPIC. Data from 478,021 participants, recruited from 10 European countries, who completed a dietary questionnaire in 1992-2000 were evaluated; 1,822 incident primary lung cancer cases were included in the present evaluation. Relative risk estimates were calculated for categories of meat intake using multi-variably adjusted Cox proportional hazard models. In addition, the continuous intake variables were calibrated by means of 24-h diet recall data to account for part of the measurement error. There were no consistent associations between meat consumption and the risk of lung cancer. Neither red meat (RR = 1.06, 95% CI 0.89-1.27 per 50 g intake/day; calibrated model) nor processed meat (RR = 1.13, 95% CI 0.95-1.34 per 50 g/day; calibrated model) was significantly related to an increased risk of lung cancer. Also, consumption of white meat and fish was not associated with the risk of lung cancer. These findings do not support the hypothesis that a high intake of red and processed meat is a risk factor for lung cancer. 相似文献
56.
The profiles of plasma leptin levels in pregnant and lactating rats and their offspring were determined. The plasma leptin levels increased on days 12 and 20 of gestation and declined on day 21 of gestation, remaining at this level during lactation. These changes were similar for lumbar adipose tissue weight, and a significant correlation was found when both variables were plotted with individual values. During the last 2 days of intrauterine life, the plasma leptin levels in the fetuses were in the same range as in their mothers, declining from day 20 to day 21. On the 1st day of life, the leptin levels increased to decline in suckling newborns after 4 days, remaining stable until day 20 of life. The enhancement in maternal white adipose tissue mass that takes place during pregnancy and its decline around parturition and lactation are proposed to contribute actively to the changes in the plasma leptin profile detected at these stages. Besides the contribution of placental leptin for the fetus and milk leptin for the suckling newborn, it is proposed that brown adipose tissue, which is the first form of adipose tissue that appears during development in the rat, is responsible for most of the changes in plasma leptin levels seen around birth, whereas its later decline could be mediated by the hormonal changes occurring after birth. 相似文献
57.
Rosado León R Muñoz Rodríguez MR Soler Huerta E Parissi Crivelli A Méndez Machado GF 《Ginecología y obstetricia de México》2007,75(11):687-690
Dengue is known as an endemic disease of tropical and subtropical regions. It was considered a disease very frequent on kids, but recently an increase was reported on adult people. Some of these cases were related to pregnant women, for that reason, we decided to check eight cases, including just the mothers who presented dengue virus infection through ELISA IgM. IgG and ELISA IgM studies. Five products were determined between 3 and 9-born-babies. Eight cases of dengue were analyzed during pregnancy, three cases of fever dengue and five cases of hemorrhagic dengue; main complications detected were threat of abortion, and premature labour, postsurgical bleeding with desiccant haematoma of uterine artery, oligohydramnios, as well as pleural effusion, two of the neonates were classified as septic for presenting fever. In no case, IgG or IgM for fever dengue was detected in neonates. 相似文献
58.
59.
To a conventional silver amalgam alloy was added 1% of stanous fluoride, to prove in vitro, if it presents any antibacteria actions against S. mutans and Lactobacillus acidophilus. Thirteen Petri plate were seeded with S. mutans and 12 Petri plate with Lactobacillus, in both cases, was disposited fluoride containing amalgam and conventional amalgam. The average of inhibition signs in the Petri plates with S. mutans was 1.7 mm in the Petri plates with Lactobacillus the average was 2.4 mm. Is demonstrated that the fluoride containing amalgam has in vitro antibacteria action in comparison with conventional amalgam, that has none. 相似文献
60.