全文获取类型
收费全文 | 50656篇 |
免费 | 2898篇 |
国内免费 | 112篇 |
专业分类
耳鼻咽喉 | 411篇 |
儿科学 | 2112篇 |
妇产科学 | 1470篇 |
基础医学 | 6515篇 |
口腔科学 | 498篇 |
临床医学 | 6761篇 |
内科学 | 9340篇 |
皮肤病学 | 767篇 |
神经病学 | 4930篇 |
特种医学 | 1042篇 |
外国民族医学 | 38篇 |
外科学 | 4713篇 |
综合类 | 521篇 |
一般理论 | 99篇 |
预防医学 | 7228篇 |
眼科学 | 687篇 |
药学 | 2707篇 |
6篇 | |
中国医学 | 85篇 |
肿瘤学 | 3736篇 |
出版年
2024年 | 215篇 |
2023年 | 527篇 |
2022年 | 745篇 |
2021年 | 1574篇 |
2020年 | 1005篇 |
2019年 | 1521篇 |
2018年 | 1702篇 |
2017年 | 1237篇 |
2016年 | 1305篇 |
2015年 | 1374篇 |
2014年 | 1920篇 |
2013年 | 2801篇 |
2012年 | 3972篇 |
2011年 | 4083篇 |
2010年 | 2166篇 |
2009年 | 1890篇 |
2008年 | 3407篇 |
2007年 | 3379篇 |
2006年 | 3099篇 |
2005年 | 3038篇 |
2004年 | 2749篇 |
2003年 | 2449篇 |
2002年 | 2305篇 |
2001年 | 320篇 |
2000年 | 200篇 |
1999年 | 316篇 |
1998年 | 457篇 |
1997年 | 342篇 |
1996年 | 297篇 |
1995年 | 311篇 |
1994年 | 258篇 |
1993年 | 229篇 |
1992年 | 134篇 |
1991年 | 143篇 |
1990年 | 121篇 |
1989年 | 106篇 |
1988年 | 110篇 |
1987年 | 77篇 |
1986年 | 99篇 |
1985年 | 109篇 |
1984年 | 123篇 |
1983年 | 106篇 |
1982年 | 124篇 |
1981年 | 158篇 |
1980年 | 106篇 |
1979年 | 67篇 |
1978年 | 62篇 |
1977年 | 64篇 |
1976年 | 61篇 |
1972年 | 57篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
101.
Anna M. Georgiopoulos Deborah Friedman Elizabeth A. Porter Amy Krasner Sheetal P. Kakarala Breanna K. Glaeser Siena C. Napoleon Janet Wozniak 《Journal of cystic fibrosis》2018,17(2):276-280
Background
International guidelines recommend depression and anxiety screening in individuals with cystic fibrosis (CF), but Attention-Deficit Hyperactivity Disorder (ADHD) remains understudied.Methods
Adults with CF (n = 53) were screened using the Adult ADHD Self-Report Scale-v1.1 Symptom Checklist (ASRS-v1.1), Cystic Fibrosis Questionnaire-Revised (CFQ-R), and a self-report measure of treatment adherence.Results
Elevated ADHD symptoms on the ASRS-v1.1 screener were reported by 15% of participants. Self-reported adherence, Body Mass Index in kg/m2 (BMI), and Forced Expiratory Volume in 1 Second, Percent Predicted (FEV1%pred) did not differ between participants with vs. without elevated ADHD scores. Three CFQ-R scales, Physical Functioning, Role Functioning, and Respiratory Symptoms, were significantly lower in participants with elevated ADHD screens (unadjusted p < 0.05). This difference remained statistically significant for the Role Functioning and Respiratory Symptoms scales following correction for multiple comparisons.Conclusions
The highly specific screening tool ASRS-v1.1 can ascertain previously undetected ADHD symptoms in adults with CF. ADHD was substantially more prevalent than expected in this population. Elevated ASRS-v1.1 screens correlated with poorer Health-Related Quality of Life (HRQoL) in some domains, but not with BMI, FEV1%pred, or self-reported CF treatment adherence. Additional research will elucidate the impact of ADHD and its treatment on HRQoL, CF self-care and health outcomes. 相似文献102.
Associations Between Lean Mass,Muscle Strength and Power,and Skeletal Size,Density and Strength in Older Men 下载免费PDF全文
Didier Chalhoub Robert Boudreau Susan Greenspan Anne B Newman Joseph Zmuda Andrew W Frank‐Wilson Nayana Nagaraj Andrew R Hoffman Nancy E Lane Marcia L Stefanick Elizabeth Barrett‐Connor Tien Dam Peggy M Cawthon Eric S Orwoll Jane A Cauley for the Osteoporotic Fractures in Men Study Research Group 《Journal of bone and mineral research》2018,33(9):1612-1621
103.
104.
105.
T. Jared McCormick Elizabeth Clarke Miller Robert Chen Viren N. Naik 《Journal canadien d'anesthésie》2018,65(4):427-436
Purpose
Point-of-care ultrasound (POCUS) involves the bedside use of ultrasound to answer specific diagnostic questions and to assess real-time physiologic responses to treatment. Although POCUS has become a well-established resource for emergency and critical care physicians, anesthesiologists are still working to obtain POCUS skills and to incorporate them into routine practice. This review defines the benefits of POCUS to anesthesia practice, identifies challenges to establishing POCUS in routine anesthesia care, and offers solutions to help guide its incorporation going forward.Principal findings
Benefits to POCUS include improving the sensitivity and specificity of the physical examination and helping to guide patient treatment. The challenges to establishing POCUS as a standard in anesthesia practice include developing and maintaining competence. There is a need to develop standards of practice and a common language between specialties to facilitate training and create guidelines regarding patient management.Conclusions
Presently, our specialty requires consensus by expert stakeholders to address issues of competence, certification, development of standards and terminology, and the management of unexpected diagnoses. To promote POCUS competency in our discipline, we support its incorporation into anesthesiology curricula and training programs and the continuing professional development of POCUS-related activities at a national level.106.
Francesco Caiazza Katarzyna Oficjalska Miriam Tosetto James J. Phelan Sinéad Noonan Petra Martin Kate Killick Laura Breen Fiona ONeill Blathnaid Nolan Simon Furney Robert Power David Fennelly Charles S. Craik Jacintha OSullivan Kieran Sheahan Glen A. Doherty Elizabeth J. Ryan 《The American journal of pathology》2019,189(10):1916-1932
107.
Susan L. Caciano Cynthia L. Inman Elizabeth E. Gockel-Blessing Edward P. Weiss 《Journal of Sports Science and Medicine》2015,14(2):364-371
Dietary acid load, quantified as the potential renal acid load (PRAL) of the diet, affects systemic pH and acid-base regulation. In a previous cross-sectional study, we reported that a low dietary PRAL (i.e. alkaline promoting diet) is associated with higher respiratory exchange ratio (RER) values during maximal exercise. The purpose of the present study was to confirm the previous findings with a short-term dietary intervention study. Additionally, we sought to determine if changes in PRAL affects submaximal exercise RER (as a reflection of substrate utilization) and anaerobic exercise performance. Subjects underwent a graded treadmill exercise test (GXT) to exhaustion and an anaerobic exercise performance test on two occasions, once after following a low-PRAL diet and on a separate occasion, after a high-PRAL diet. The diets were continued as long as needed to achieve an alkaline or acid fasted morning urine pH, respectively, with all being 4-9 days in duration. RER was measured during the GXT with indirect calorimetry. The anaerobic performance test was a running time-to-exhaustion test lasting 1-4 min. Maximal exercise RER was lower in the low-PRAL trial compared to the high-PRAL trial (1.10 ± 0.02 vs. 1.20 ± 0.05, p = 0.037). The low-PRAL diet also resulted in a 21% greater time to exhaustion during anaerobic exercise (2.56 ± 0.36 vs. 2.11 ± 0.31 sec, p = 0.044) and a strong tendency for lower RER values during submaximal exercise at 70% VO2max (0.88 ± 0.02 vs. 0.96 ± 0.04, p = 0.060). Contrary to our expectations, a short-term low-PRAL (alkaline promoting) diet resulted in lower RER values during maximal-intensity exercise. However, the low-PRAL diet also increased anaerobic exercise time to exhaustion and appears to have shifted submaximal exercise substrate utilization to favor lipid oxidation and spare carbohydrate, both of which would be considered favorable effects in the context of exercise performance.
Key points
- Short-term (4-9 days) changes in the acid or alkaline promoting qualities of the diet, quantified as potential renal acid load (PRAL), alter systemic pH, as evidenced in the present study by changes in fasted morning urine pH. Low-PRAL (alkaline promoting) diets are characterized by high intakes of vegetables and fruits with limited consumption of meats, cheeses, and grains while high-PRAL diets are characterized by the opposite dietary pattern.
- An alkaline promoting (low-PRAL) diet increases anaerobic exercise performance, as evidenced by greater time-to-exhaustion during high-intensity treadmill running.
- Preliminary evidence suggests that an alkaline promoting (low-PRAL) diet increases lipid oxidation and may have a carbohydrate-sparing effect during submaximal endurance exercise, although further studies are needed.
- In contrast to what has been observed in response to habitual/long-term dietary patterns, a short-term low-PRAL diet does not increase maximal exercise respiratory exchange ratio and even appears to lower it. This suggests that short-term and long-term alterations in PRAL have different physiologic effects on this parameter.
108.
109.
This study investigated the relationship between stress and body satisfaction in adolescence. A sample consisting of 515 adolescents aged 12–16 years completed a series of self‐report questionnaires assessing general and specific aspects of adolescent stress, body satisfaction and the psychological constructs of self‐esteem, depressive symptoms and body importance. Results revealed a significant association between higher body dissatisfaction and higher ratings of peer stress, lower self‐esteem and greater body importance for female and male adolescents. These findings suggest that adolescent stress relates to satisfaction with the body and that this stress is specifically focused on the peer environment for both genders during adolescence. This may have implications for intervention programmes aimed at improving body satisfaction, suggesting that the inclusion of stress management training in these programmes could specifically focus on difficulties within the peer domain. Copyright © 2013 John Wiley & Sons, Ltd. 相似文献
110.