全文获取类型
收费全文 | 4036篇 |
免费 | 216篇 |
国内免费 | 13篇 |
专业分类
耳鼻咽喉 | 86篇 |
儿科学 | 113篇 |
妇产科学 | 37篇 |
基础医学 | 557篇 |
口腔科学 | 223篇 |
临床医学 | 351篇 |
内科学 | 680篇 |
皮肤病学 | 76篇 |
神经病学 | 406篇 |
特种医学 | 172篇 |
外科学 | 578篇 |
综合类 | 10篇 |
一般理论 | 1篇 |
预防医学 | 333篇 |
眼科学 | 123篇 |
药学 | 242篇 |
中国医学 | 4篇 |
肿瘤学 | 273篇 |
出版年
2024年 | 4篇 |
2023年 | 34篇 |
2022年 | 55篇 |
2021年 | 106篇 |
2020年 | 77篇 |
2019年 | 90篇 |
2018年 | 108篇 |
2017年 | 60篇 |
2016年 | 123篇 |
2015年 | 105篇 |
2014年 | 138篇 |
2013年 | 205篇 |
2012年 | 274篇 |
2011年 | 264篇 |
2010年 | 158篇 |
2009年 | 146篇 |
2008年 | 300篇 |
2007年 | 278篇 |
2006年 | 306篇 |
2005年 | 249篇 |
2004年 | 226篇 |
2003年 | 232篇 |
2002年 | 210篇 |
2001年 | 37篇 |
2000年 | 23篇 |
1999年 | 33篇 |
1998年 | 53篇 |
1997年 | 33篇 |
1996年 | 30篇 |
1995年 | 30篇 |
1994年 | 34篇 |
1993年 | 35篇 |
1992年 | 21篇 |
1991年 | 13篇 |
1990年 | 10篇 |
1989年 | 13篇 |
1988年 | 17篇 |
1987年 | 9篇 |
1986年 | 9篇 |
1985年 | 13篇 |
1984年 | 13篇 |
1983年 | 14篇 |
1982年 | 10篇 |
1981年 | 10篇 |
1980年 | 8篇 |
1979年 | 12篇 |
1978年 | 12篇 |
1977年 | 4篇 |
1975年 | 4篇 |
1974年 | 4篇 |
排序方式: 共有4265条查询结果,搜索用时 15 毫秒
41.
Niklas Lindblad Timo Hnninen Maarit Valtonen Olli J. Heinonen Matti Waris Olli Ruuskanen 《Viruses》2022,14(12)
Influenza A outbreaks occurred in two professional hockey teams just after two games they played against each other. Thirteen players and two staff members fell ill during 17–20 April 2022, while COVID-19 was prevalent. Altogether, seven players missed an important game due to influenza. The rapid diagnosis permitted effective pharmaceutical and nonpharmaceutical control of the outbreaks. 相似文献
42.
43.
Huber Timo Steininger Philipp Irrgang Pascal Korn Klaus Tenbusch Matthias Diesch Katharina Achenbach Susanne Kremer Andreas E. Werblow Marissa Vetter Marcel Bogdan Christian Held Jürgen 《European journal of clinical microbiology & infectious diseases》2021,40(9):1999-2004
European Journal of Clinical Microbiology & Infectious Diseases - 相似文献
44.
45.
Eine Schilddrüsenunterfunktion in der Schwangerschaft, meistens ausgelöst durch Autoimmunprozesse oder Jodmangel, kann sich negativ auf die Gesundheit von Mutter und Kind auswirken. Aktuelle Leitlinien empfehlen bei Vorliegen einer manifesten Hypothyreose übereinstimmend die Aufnahme einer L(Levo)-Thyroxin-Substitution. Bezüglich Diagnose und Therapie einer subklinischen Hypothyreose in der Schwangerschaft dagegen geben Fachgesellschaften in ihren aktuellen Leitlinien teilweise unterschiedliche Empfehlungen. Im vorliegenden Artikel wird eine Übersicht über die aktuellen Empfehlungen gegeben und versucht, auf dieser Basis das gegenwärtig bestmögliche diagnostische und therapeutische Vorgehen herauszuarbeiten. 相似文献
46.
The General Health Questionnaire (GHQ-12) is a popular measure of psychological distress. Despite its widespread use, an ongoing controversy pertains to its internal structure. Although the GHQ-12 was originally constructed to capture a unitary construct, empirical studies identified different factor structures. Therefore, this study examined the dimensionality of the GHQ-12 in two independent meta-analyses. The first meta-analysis used summary data published in 38 primary studies (total N?=?76,473). Meta-analytic exploratory factor analyses identified two factors formed by negatively and positively worded items. The second meta-analysis included individual responses of 410,640 participants from 84 independent samples. Meta-analytic confirmatory factor analyses corroborated the two-dimensional structure of the GHQ-12. However, bifactor modelling showed that most of the variance was explained by a general factor. Therefore, subscale scores reflected rather limited unique variance. Overall, the two meta-analyses demonstrated that the GHQ-12 is essentially unidimensional. It is not recommended to use and interpret subscale scores because they primarily reflect general mental health rather than distinct constructs. 相似文献
47.
48.
49.
An in vitro degradation study of three bioresorbable glass fiber-reinforced poly(l-lactide-co-dl-lactide) (PLDLA) composites was carried out in simulated body fluid (SBF), to simulate body conditions, and deionized water, to evaluate the nature of the degradation products. The changes in mechanical and chemical properties were systematically characterized over 52 weeks dissolution time to determine the degradation mechanism and investigate strength retention by the bioresorbable glass fiber-reinforced PLDLA composite. The degradation mechanism was found to be a combination of surface and bulk erosion and does not follow the typical core-accelerated degradation mechanism of poly(α-hydroxyacids). Strength retention by bioresorbable glass fiber-reinforced PLDLA composites can be tailored by changing the oxide composition of the glass fibers, but the structure–property relationship of the glass fibers has to be understood and controlled so that the phenomenon of ion leaching can be utilized to control the degradation rate. Therefore, these high performance composites are likely to open up several new possibilities for utilizing resorbable materials in clinical applications which could not be realized in the past. 相似文献
50.
Jaana I. Halonen Jussi Vahtera Stephen Stansfeld Tarja Yli-Tuomi Paula Salo Jaana Pentti Mika Kivim?ki Timo Lanki 《Environmental health perspectives》2012,120(10):1391-1396
Background: Associations between traffic noise and sleep problems have been detected in experimental studies, but population-level evidence is scarce.Objectives: We studied the relationship between the levels of nighttime traffic noise and sleep disturbances and identified vulnerable population groups.Methods: Noise levels of nighttime–outdoor traffic were modeled based on the traffic intensities in the cities of Helsinki and Vantaa, Finland. In these cities, 7,019 public sector employees (81% women) responded to postal surveys on sleep and health. We linked modeled outdoor noise levels to the residences of the employees who responded to the postal survey. We used logistic regression models to estimate associations of noise levels with subjectively assessed duration of sleep and symptoms of insomnia (i.e., difficulties falling asleep, waking up frequently during the night, waking up too early in the morning, nonrestorative sleep). We also used stratified models to investigate the possibility of vulnerable subgroups.Results: For the total study population, exposure to levels of nighttime–outside (Lnight, outside) traffic noise > 55 dB was associated with any insomnia symptom ≥ 2 nights per week [odds ratio (OR) = 1.32; 95% confidence interval (CI): 1.05, 1.65]. Among participants with higher trait anxiety scores, which we hypothesized were a proxy for noise sensitivity, the ORs for any insomnia symptom at exposures to Lnight, outside traffic noises 50.1–55 dB and > 55 dB versus ≤ 45 dB were 1.34 (95% CI: 1.00, 1.80) and 1.61 (95% CI: 1.07, 2.42), respectively.Conclusions: Nighttime traffic noise levels > 50 dB Lnight, outside was associated with insomnia symptoms among persons with higher scores for trait anxiety. For the total study population, Lnight, outside > 55 dB was positively associated with any symptoms. 相似文献