全文获取类型
收费全文 | 37985篇 |
免费 | 1695篇 |
国内免费 | 297篇 |
专业分类
耳鼻咽喉 | 276篇 |
儿科学 | 679篇 |
妇产科学 | 425篇 |
基础医学 | 4974篇 |
口腔科学 | 1111篇 |
临床医学 | 2235篇 |
内科学 | 9359篇 |
皮肤病学 | 920篇 |
神经病学 | 2559篇 |
特种医学 | 1294篇 |
外科学 | 6764篇 |
综合类 | 155篇 |
一般理论 | 1篇 |
预防医学 | 1053篇 |
眼科学 | 763篇 |
药学 | 2205篇 |
2篇 | |
中国医学 | 134篇 |
肿瘤学 | 5068篇 |
出版年
2024年 | 87篇 |
2023年 | 257篇 |
2022年 | 561篇 |
2021年 | 967篇 |
2020年 | 514篇 |
2019年 | 659篇 |
2018年 | 866篇 |
2017年 | 683篇 |
2016年 | 802篇 |
2015年 | 825篇 |
2014年 | 1112篇 |
2013年 | 1422篇 |
2012年 | 2300篇 |
2011年 | 2719篇 |
2010年 | 1531篇 |
2009年 | 1258篇 |
2008年 | 2315篇 |
2007年 | 2538篇 |
2006年 | 2373篇 |
2005年 | 2567篇 |
2004年 | 2482篇 |
2003年 | 2465篇 |
2002年 | 2468篇 |
2001年 | 412篇 |
2000年 | 356篇 |
1999年 | 480篇 |
1998年 | 592篇 |
1997年 | 466篇 |
1996年 | 449篇 |
1995年 | 379篇 |
1994年 | 337篇 |
1993年 | 310篇 |
1992年 | 258篇 |
1991年 | 238篇 |
1990年 | 224篇 |
1989年 | 215篇 |
1988年 | 186篇 |
1987年 | 129篇 |
1986年 | 124篇 |
1985年 | 111篇 |
1984年 | 120篇 |
1983年 | 102篇 |
1982年 | 83篇 |
1981年 | 95篇 |
1980年 | 90篇 |
1979年 | 82篇 |
1978年 | 52篇 |
1977年 | 38篇 |
1976年 | 29篇 |
1973年 | 38篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
1.
Yosuke Homma Takashi Shiga Hiraku Funakoshi Dai Miyazaki Atsushi Sakurai Yoshio Tahara Ken Nagao Naohiro Yonemoto Arino Yaguchi Naoto Morimura 《The American journal of emergency medicine》2019,37(2):241-248
Objective
This study assessed the association between the timing of first epinephrine administration (EA) and the neurological outcomes following out-of-hospital cardiac arrests (OHCAs) with both initial shockable and non-shockable rhythms.Methods
This was a post-hoc analysis of a multicenter prospective cohort study (SOS-KANTO 2012), which registered OHCA patients in the Kanto region of Japan from January 2012 to March 2013. We included consecutive adult OHCA patients who received epinephrine. The primary result included 1-month favorable neurological outcomes defined as cerebral performance category (CPC) 1 or 2. Secondary results included 1-month survival and return of spontaneous circulation (ROSC) after arrival at the hospital. Multivariable logistic regression analysis determined the association between delay per minute of the time from call to first EA in both pre- or in-hospital settings and outcomes.Results
Of the 16,452 patients, 9344 were eligible for our analyses. In univariable analysis, the delay in EA was associated with decreased favorable neurological outcomes only when the initial rhythm was a non-shockable rhythm. In multivariable analyses, delay in EA was associated with decreased ROSC (adjusted odds ratio [OR] for one minute delay, 0.97; 95% confidence interval [CI], 0.96–0.98) and 1-month survival (adjusted OR, 0.95; 95% CI, 0.92–0.97) when the initial rhythm was a non-shockable rhythm, whereas during a shockable rhythm, delay in EA was not associated with decreased ROSC and 1-month survival.Conclusions
While assessing the effectiveness of epinephrine for OHCA, we should consider the time-limited effects of epinephrine. Additionally, consideration of early EA based on the pathophysiology is needed. 相似文献2.
3.
Wenzhi Bai Yuji Takao Takashi Kubo 《Journal of toxicology and environmental health. Part A》2020,83(1):36-44
ABSTRACTHousehold effluents are predominantly treated by wastewater treatment plants (WWTPs). Other treatment methods, which were examined in this study, are also used in the countryside. These treatment modes include (1) onsite toilet wastewater treatment system (OTWTS), (2) onsite wastewater treatment system (OWTS), (3) community wastewater treatment system (CWTS), and (4) onsite vault toilet (OVT). Household effluents consist of excrements and urine released from toilets as well as wastewater released from kitchens and bathrooms. In the present study, household effluents that were discharged from the residential areas having undergone similar treatment methodologies were compared using the umu test, an in vitro bioassay to assess genotoxicity potential. The different treatment methodologies were categorized based upon whether the two kinds of wastewater were mixed or not mixed and treated or not treated. Treated wastewater containing excrements and urine from the OTWTS exhibited the strongest genotoxicity potential compared to other effluents, whereas most of the kitchen and bathroom wastewater from OVT did not display genotoxicity. Data indicated that the genotoxicants in the effluents originated primarily from excrements and urine, and may increase an adverse environmental risk. 相似文献
4.
Edward J.A. Harris Steven Kao Brian McCaughan Takashi Nakano Nobuyuki Kondo Rebecca Hyland Anna K. Nowak Nicholas H. de Klerk Fraser J.H. Brims 《Journal of thoracic oncology》2019,14(2):288-293
Introduction
Malignant pleural mesothelioma (MPM) is an uncommon cancer with a poor prognosis and heterogeneous survival. Surgery for MPM is offered in some specialist centers to highly selected patients. A previously described classification and regression tree (CART) model stratified survival in unselected MPM patients using routinely collected clinical data. This study aimed to examine the performance of this CART model on a highly selected surgical population.Methods
Data were collected from subjects undergoing cytoreductive surgery for MPM from specialist centers in Hyõgo, Japan, and Sydney, Australia, between 1991 and 2016. The CART model was applied using the combination of clinical variables to stratify subjects into risk groups (1 through 4); survival characteristics were then compared.Results
Two hundred eighty-nine cases were included (205 from Australia, 84 from Japan). Overall median survival was 34.6 (interquartile range: 17.5–56.1) months; median age was 63.0 (interquartile range: 57.0–67.8) years, and 83.0% (n = 240) were male. There were no clinically meaningful differences between the two cohorts. Survival across the four risk groups was significantly different (p < 0.0001); the model stratified survival well with a Harrell's concordance statistic of 0.62 (95% confidence interval: 0.57–0.66) at 36 months. The group with the longest survival (median, 82.5 months) had: no weight loss, hemoglobin > 153 g/L and serum albumin > 43 g/L at time of referral to the surgical center.Conclusions
Using routinely available clinical variables, the CART model was able to stratify surgical patients into risk groups with statistically different survival characteristics with fair to good performance. Presence of weight loss, anemia, and low albumin should confer caution when considering surgical therapy for MPM. 相似文献5.
Hille T. de Vries Takashi Nakamae Kenji Fukui Damiaan Denys Jin Narumoto 《European neuropsychopharmacology》2018,28(6):780-781
Background
A large number of studies have reported the high prevalence of problematic internet use (PIU) among adolescents and students (13-50%)1, and PIU has been associated with many psychiatric symptoms2. In contrast, only a few studies have investigated its prevalence among the adult population. To the best of our knowledge, there have been no studies investigating the prevalence and comorbidity of PIU in a psychiatric population although psychiatric symptoms might either induce PIU in patients with psychiatric illnesses, or PIU might induce or aggravate psychiatric symptoms. The aims of this study are to investigate the prevalence of PIU and psychiatric co-morbidity among adult psychiatric patients.Methods
Three hundred thirty-three adult psychiatric patients with internet access were recruited at the outpatient clinic of psychiatry at the University Hospital, Kyoto Prefectural University of Medicine over a three-month period. Two hundred thirty-one of them completed the survey (response rate: 69.4%; Male/Female/Transgender: 90/139/2; mean age = 42.2). We divided participants into “normal internet users” and “problematic internet users” using a combination of Young’s Internet Addiction Test (IAT) and the Compulsive Internet Use Scale (CIUS), using established cut-off values. Demographic data and comorbid psychiatric symptoms were compared between the two groups, using self-rating scales measuring insomnia (Athens Insomnia Scale, AIS), depression (Beck Depression Inventory, BDI), anxiety (State-trait Anxiety Inventory, STAI), attention deficit hyperactivity disorder (ADHD) (Adult ADHD Self-report Scale, ASRS), autism (Autism Spectrum Quotient, AQ), obsessive-compulsive disorder (OCD) (Obsessive-Compulsive Inventory, OCI), social anxiety disorder (SAD) (Liebowitz Social Anxiety Scale, LSAS), alcohol abuse, and impulsivity (Barratt Impulsive Scale, BIS).Results
Of our 231 respondents, 58 (25.1%) were defined as problematic internet users, as they scored high on either the IAT (40 or more) or CIUS (21 or more). The age of problematic internet users was significantly lower than that of normal internet users (35.9 vs 43.6, p<0.001, Mann-Whitney U test). The problematic internet users scored significantly higher on scales measuring sleep problems (AIS, 8.8 for problematic internet users vs 6.3 for normal internet users, p<0.001), depression (BDI, 27.4 vs 18.3, p<0.001), trait anxiety (STAI, 61.8 vs 53.9, p<0.001), ADHD (ASRS, part A 3.1 vs 1.8 and part B 3.5 vs 1.8, p<0.001), autism (AQ, 25.9 vs 21.6, p<0.001), OCD (OCI, 63.2 vs 36.3, p<0.001), SAD (LSAS, 71.4 vs 54.0, p<0.001), and impulsivity (BIS, 67.4 vs 63.5, p=0.004).Conclusions
The prevalence of PIU among adult psychiatric patients is relatively high (25%). As previous studies reported in the general population, PIU among adult psychiatric patients was associated with lower age and higher psychiatric comorbidity. Longitudinal research is needed to determine any causal relations between problematic internet use and psychopathological illnesses. 相似文献6.
Hara Yasumasa Arai Midori A. Sakai Kanae Ishikawa Naoki Gonoi Tohru Yaguchi Takashi Ishibashi Masami 《Journal of natural medicines》2018,72(1):280-289
Journal of Natural Medicines - A new amide, named dehydropropylpantothenamide (1), was obtained by a co-culture of Nocardia tenerifensis IFM 10554T in the presence of the mouse macrophage-like cell... 相似文献
7.
Sakai Takashi Abe Hirohito Nakamura Nobuo Hamada Hidetoshi Takao Masaki Sugano Nobuhiko 《Journal of artificial organs》2019,22(1):84-90
Journal of Artificial Organs - The aim was to elucidate the differences in activities of daily living (ADL) after hip arthroplasty among hip resurfacing (HRA), anterolateral total hip arthroplasty... 相似文献
8.
Yamauchi Takashi Kubota Suguru Hasegawa Kosei Ueda Hideki 《Journal of artificial organs》2019,22(1):61-67
Journal of Artificial Organs - Thoracic endovascular aortic repair (TEVAR) is expected to be minimally invasive, especially in older patients. However, clinical results of TEVAR in octogenarians... 相似文献
9.
Mano Akiko Nishimura Takashi Murata Tomohiro Kawata Mitsuhiro Kyo Shunei 《Journal of artificial organs》2019,22(2):173-176
Journal of Artificial Organs - Left ventricular assist device is an established therapeutic option for the patient with end-stage heart failure. Recently, durable continuous-flow devices have... 相似文献
10.
Nishida Kentaro Sakaguchi Hirokazu Kamei Motohiro Saito Toru Fujikado Takashi Nishida Kohji 《Journal of artificial organs》2019,22(3):237-245
Journal of Artificial Organs - In this study, we aimed to determine the electrophysiological efficacy, safety, and electrical stability of a chronically implanted electrode for suprachoroidal... 相似文献