首页 | 本学科首页   官方微博 | 高级检索  
文章检索
  按 检索   检索词:      
出版年份:   被引次数:   他引次数: 提示:输入*表示无穷大
  收费全文   565篇
  免费   28篇
  国内免费   1篇
耳鼻咽喉   2篇
儿科学   36篇
妇产科学   19篇
基础医学   63篇
口腔科学   6篇
临床医学   44篇
内科学   133篇
皮肤病学   19篇
神经病学   29篇
特种医学   19篇
外科学   29篇
综合类   17篇
预防医学   90篇
眼科学   39篇
药学   28篇
中国医学   6篇
肿瘤学   15篇
  2023年   5篇
  2022年   8篇
  2021年   31篇
  2020年   14篇
  2019年   13篇
  2018年   11篇
  2017年   13篇
  2016年   11篇
  2015年   7篇
  2014年   20篇
  2013年   27篇
  2012年   50篇
  2011年   43篇
  2010年   22篇
  2009年   17篇
  2008年   20篇
  2007年   38篇
  2006年   41篇
  2005年   33篇
  2004年   42篇
  2003年   25篇
  2002年   23篇
  2001年   17篇
  2000年   15篇
  1999年   8篇
  1998年   3篇
  1997年   10篇
  1994年   3篇
  1993年   2篇
  1992年   1篇
  1989年   2篇
  1988年   1篇
  1985年   2篇
  1981年   1篇
  1980年   4篇
  1979年   1篇
  1978年   2篇
  1977年   4篇
  1975年   1篇
  1974年   1篇
  1967年   1篇
  1966年   1篇
排序方式: 共有594条查询结果,搜索用时 15 毫秒
91.
92.
We investigated the effects of combined lower body (LB) endurance and upper body (UB) resistance training on endurance, strength, blood lipid profile and body composition in active older men. Ten healthy still active men (73 ± 4 years, peak: 36 (31–41) ml min−1 kg−1) were tested before and after 14 weeks of combined training (3 times week−1). Training consisted of 3 × 12 min of high intensity interval training on a bicycle for endurance interspersed by 3 × 12 min of UB resistance exercises. peak during leg cycling and arm cranking, isokinetic torque of knee extensor and shoulder abductor and the cross-sectional area (CSA) of several muscles from UB and LB were measured. Sagittal abdominal diameter (SAD) and abdominal fat area were measured on MRI scans. Total body composition was assessed by hydrostatic weighing (HW) and dual-energy X-ray absorptiometry (DEXA). Blood lipid profile was assessed before and after training. By the end of the training period, peak (l min−1) increased significantly by 9 and 16% in leg cycling and arm cranking tests, respectively. Maximal isokinetic torque increased both for the knee extensor and shoulder abductor muscle groups. CSA increased significantly in deltoid muscle. Percentage of body fat decreased by 1.3% (P < 0.05) and abdominal fat and SAD decreased by 12 and 6%, respectively (P < 0.01). There was also a significant decrease in total cholesterol and low-density lipoprotein. Thus, combined LB endurance and UB resistance training can improve endurance, strength, body composition and blood lipid profile even in healthy active elderly.  相似文献   
93.
94.
ObjectivesThe study aimed to test in a sample of Egyptian antipsychotic naive patients the hypotheses that the disordered eating attitudes co-occur with schizophrenia in a higher frequency than would be expected by chance in the general population and that the disordered eating comorbidity would be associated with more severe schizophrenia psychopathology. Previous studies have been mostly concerned with the impact of the antipsychotics. Studies relating abnormal eating behavior to the schizophrenia psychopathology rather than to its treatment are lacking.MethodIn this case-control cross-sectional study, 50 consecutive antipsychotic naive patients, newly attending the psychiatric outpatient clinic, University Hospital, Zagazig, Egypt, with a Diagnostic and Statistical Manual of Mental Disorders, Fourth Edition, diagnosis of schizophrenia, were assessed by the Positive and Negative Syndrome Scale and compared with 50 nonpsychiatric controls using the Eating Attitudes Test (EAT40).ResultsPatients with schizophrenia had an EAT40 mean score (23.4 ± 7.8) higher than that of controls (19.7 ± 7.2) (P = .015). Prevalence of disordered eating (defined by a score of ≥30 on the EAT40) in these patients was higher than in the control group (30% vs 12%, P = .027). Comparison between schizophrenia patients with and without disordered eating showed no significant differences in demographic and a number of clinical variables, but they differed in their scores on lifestyle characteristics and anthropometric measures. The group of patients with disordered eating had also higher scores on total and all scale factors but not on the negative symptom scale.ConclusionsData of this study show, perhaps for the first time, that “disordered” eating attitudes, as measured by the EAT40, are higher in a group of Egyptian patients with schizophrenia than in controls. However, the lack of difference between patients with and without disordered eating in terms of demographic and a number of clinical characteristics fail to explain the hypothesis that schizophrenia with disordered eating is a distinct subtype of schizophrenia. Data indicate, on the other hand, that the presence of disordered eating behavior in patients with schizophrenia is associated with the expression of more active psychotic symptoms.  相似文献   
95.
The Middle‐East and Africa Influenza Surveillance Network (MENA‐ISN), established in 2014, includes 15 countries at present. Country representatives presented their influenza surveillance programmes, vaccine coverage and influenza control actions achieved, and provided a list of country surveillance/control objectives for the upcoming 3 years. This report details the current situation of influenza surveillance and action plans to move forward in MENA‐ISN countries. Data were presented at the 8th MENA‐ISN meeting, organized by the Mérieux Foundation that was held on 10‐11 April 2018 in Cairo, Egypt. The meeting included MENA‐ISN representatives from 12 countries (Algeria, Egypt, Jordan, Kenya, Lebanon, Libya, Morocco, Pakistan, Saudi Arabia, South Africa, Tunisia and United Arab Emirates) and experts from the Canadian Centre for Vaccinology, and the World Health Organization. Meeting participants concluded that influenza remains a significant threat especially in high‐risk groups (children under‐5, elderly, pregnant women and immunosuppressed individuals) in the MENA‐ISN region. Additional funding and planning are required by member countries to contain this threat. Future meetings will need to focus on creative and innovative ways to inform policy and initiatives for vaccination, surveillance and management of influenza‐related morbidity and mortality especially among the most vulnerable groups of the population.  相似文献   
96.
97.
98.
99.
PURPOSE: To evaluate the visual outcome and safety of simultaneous bilateral cataract extraction. SETTING: Stobhill Hospital NHS Trust, Glasgow, United Kingdom. METHODS: This retrospective case review comprised 259 consecutive patients (518 eyes) who had simultaneous bilateral cataract surgery. Surgeries included bilateral extracapsular procedures, uniocular extracapsular procedures performed simultaneously with a different type of intraocular lens surgery in the other eye, and 1 bilateral intracapsular procedure. Outcome measures were postoperative best spectacle-corrected visual acuity (BSCVA), intraoperative and postoperative complication rates, and conjunctival swab culture results. RESULTS: Eighty-three percent of patients (75% of eyes) with measured preoperative and postoperative BSCVA achieved an acuity of 6/12 or better. Intraoperative and postoperative complication rates were similar to those in previous reports of unilateral extracapsular surgery and simultaneous bilateral cataract surgery. Endophthalmitis occurred in 1 eye (0.19%). There were no bilateral complications that resulted in visual loss. Cultures were positive from 42% of conjunctival swabs; 81% of positive cultures were coagulase-negative Staphylococcus and 10% were Staphylococcus aureus. CONCLUSIONS: Simultaneous bilateral cataract surgery did not lead to an increased incidence of serious intraoperative or postoperative complications, and visual acuity results were good.  相似文献   
100.
In the present study, the methanolic, hydro-methanolic, dichloromethane, hexane and aqueous extracts of Salvia ceratophylla L. (Family: Lamiaceae), a lemon-scented herb, were tested for total phenolic (TPC) and flavonoid content (TFC) and antioxidant activities were evaluated using a battery of assays (2,2-diphenyl-1-picrylhydrazyl (DPPH), 2,2-azino-bis(3-ethylbenzothiazoline-6-sulfonic acid) (ABTS), ferric reducing antioxidant power (FRAP), cupric reducing antioxidant capacity, total antioxidant capacity (TAC) (phosphomolybdenum) and metal chelating). Enzyme inhibitory effects were investigated using acetyl- (AChE), butyryl-cholinesterase (BChE), tyrosinase, α-amylase and α-glucosidase as target enzymes. Regarding the cytotoxic abilities, HepG2, B164A5 and S17 cell lines were used. The phytochemical profile was conducted using liquid chromatography-mass spectrometry/mass spectrometry (LC-MS/MS). Our data showed that the methanolic aerial extracts possessed the highest phenolic (72.50 ± 0.63 mg gallic acid equivalent per g) and flavonoid (43.77 ± 1.09 mg rutin equivalent per g) contents. The hydro-methanolic aerial extract showed significant DPPH radical scavenging activity (193.40 ± 0.27 mg TE per g) and the highest reducing potential against CUPRAC (377.93 ± 2.38 mg TE per g). The best tyrosinase activity was observed with dichloromethane root extract (125.45 ± 1.41 mg kojic acid equivalent per g). Among the tested extracts, hexane root extract exerted the highest antimicrobial potential with a minimum inhibitory concentration value of 0.048 mg mL−1. Methanolic root extract showed the lowest cytotoxicity (28%) against HepG2 cells. Phytochemical analysis revealed the presence of important polyphenolic compounds including luteolin, gallic acid, rosmarinic acid, to name a few. This research can be used as one methodological starting point for further investigations on this lemon-scented herb.

Our findings suggested that Salvia ceratophylla could be one potential raw material in industrial applications.  相似文献   
设为首页 | 免责声明 | 关于勤云 | 加入收藏

Copyright©北京勤云科技发展有限公司  京ICP备09084417号