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   2265篇
  免费   103篇
  国内免费   47篇
耳鼻咽喉   4篇
儿科学   41篇
妇产科学   39篇
基础医学   186篇
口腔科学   362篇
临床医学   300篇
内科学   97篇
皮肤病学   206篇
神经病学   8篇
特种医学   27篇
外科学   37篇
综合类   328篇
预防医学   118篇
眼科学   24篇
药学   175篇
  2篇
中国医学   57篇
肿瘤学   404篇
  2023年   18篇
  2022年   22篇
  2021年   39篇
  2020年   39篇
  2019年   26篇
  2018年   22篇
  2017年   41篇
  2016年   41篇
  2015年   42篇
  2014年   83篇
  2013年   124篇
  2012年   112篇
  2011年   151篇
  2010年   98篇
  2009年   96篇
  2008年   122篇
  2007年   135篇
  2006年   128篇
  2005年   156篇
  2004年   111篇
  2003年   82篇
  2002年   70篇
  2001年   64篇
  2000年   62篇
  1999年   50篇
  1998年   43篇
  1997年   51篇
  1996年   26篇
  1995年   29篇
  1994年   24篇
  1993年   16篇
  1992年   21篇
  1991年   25篇
  1990年   21篇
  1989年   21篇
  1988年   31篇
  1987年   19篇
  1986年   15篇
  1985年   19篇
  1984年   16篇
  1983年   14篇
  1982年   13篇
  1981年   14篇
  1980年   9篇
  1979年   10篇
  1978年   11篇
  1977年   7篇
  1976年   14篇
  1975年   4篇
  1974年   4篇
排序方式: 共有2415条查询结果,搜索用时 15 毫秒
1.
目的 利用一个菌株-多个化合物(OSMAC)方法研究海洋来源真菌Cochliobolus lunatus的次生代谢产物及其抗真菌活性。方法 利用氮源丰富的GPY培养基诱导海洋来源真菌Cochliobolus lunatus产生新的酯肽类化合物,采用正相硅胶柱层析、凝胶柱层析、半制备高效液相色谱(HPLC)等方法对化合物进行分离纯化,利用核磁共振波谱学(NMR)和X-Ray单晶衍射手段并参考文献对化合物进行结构表征,利用各种活性模型对其进行系统的生物学活性评价。结果 从海洋来源真菌分离获得环十酯肽化合物cyclopeptolide 1,并报道其晶体结构,发现其具有抗真菌活性(MIC=16 μg/mL),并与临床药物氟胞嘧啶在抗真菌实验中显示协同效应。结论 cyclopeptolide 1在抗真菌药物研发领域有望成为重要的先导化合物。  相似文献   
2.
【摘要】 白细胞介素17A在银屑病的发生发展中具有关键作用。目前,有多种白细胞介素17A及其受体拮抗剂在多个国家上市并应用于银屑病的治疗,取得了明确疗效。然而,该类生物制剂在临床试验阶段及上市后,仍然有多项不良反应报道,包括上呼吸道感染、念珠菌感染、中性粒细胞减少和炎症性肠病等,严重者甚至可危及生命。本文综述3种白细胞介素17A及其受体拮抗剂司库奇尤单抗、ixekizumab和brodalumab的临床安全性。  相似文献   
3.
摘要〓目的〓探究紫苏醇的杀菌效果,探讨其在消毒领域的应用价值。方法〓采用悬液定量杀灭试验方法,观察紫苏醇对部分消毒指标菌的杀灭效果。结果〓用浓度为4 000 mg/L的紫苏醇溶液对悬液内金黄色葡萄球菌作用5 min,杀灭对数值均>5.00|用浓度为3 000 mg/L的紫苏醇溶液对悬液内大肠埃希菌和白色念珠菌作用5 min,杀灭对数值均>5.00。结论〓紫苏醇溶液对部分消毒试验指标菌具有很好的杀灭效果,可进一步探讨其在消毒领域实际应用和使用安全性。  相似文献   
4.
Candida albicans (C. albicans) biofilm is a common etiological factor in denture stomatitis. The purpose of this study was to investigate the effects of incorporating 2-methacryloyloxyethyl phosphorylcholine (MPC) as a protein repellent into a new high-impact denture acrylic (HIPA) resin on the surface roughness, solution pH, and C. albicans biofilm adhesion to the denture base. The new acrylic denture resin base was formulated by mixing MPC into HIPA resin at mass fractions of 1.5%, 3%, and 4.5%. Surface roughness was measured using a Mitutoyo surface roughness tester. C. albicans biofilm growth and viability were assessed via colony forming unit counts. The pH of the biofilm growth medium was measured using a digital pH meter. Adding MPC to the HIPA resin at percentages of 1.5% and 3% increased the roughness values significantly (p < 0.05), while adding 4.5% MPC resulted in no difference in roughness values to that of the control group (p > 0.05). All experimental groups demonstrated neutral pH values (pH ≅ 7) and were not significantly different from each other (p > 0.05). Incorporating 2-methacryloyloxyethyl phosphorylcholine at 4.5% resulted in a significant (≅1 log) colony-forming unit reduction compared with the control group with 0% MPC (p < 0.05). A fungal-retarding denture acrylic resin was developed through the incorporation of MPC for its protein-repelling properties. This newly developed denture acrylic material has the potential to prevent oral microbial infections, such as denture stomatitis.  相似文献   
5.
Rationale:Endogenous fungal endophthalmitis (EFE) is a sight-threatening complication of systemic fungemia. As the prevalence rises, treatment remains a challenge especially when there is a failure in first-line treatment or drug-resistant fungus. This case report studies a case of chronic EFE, focusing on the diagnostic procedures, treatment options, monitoring parameters and the treatment outcomePatient concerns:A 64-year-old man with underlying well controlled diabetes mellitus was treated with 2 weeks’ course of intravenous antifungal fluconazole for pyelonephritis as his blood culture grew Candida albicans. Concurrently, he complained of 3 months of bilateral painless progressive blurring of vision. At presentation, his visual acuity (VA) was light perception both eyes. Ocular examination revealed non granulomatous inflammation with dense vitritis of both eyes.Diagnosis:He was diagnosed with EFE but the condition responded poorly with the medications.Interventions:He was treated with intravitreal (IVT) amphotericin B and fluconazole was continued. Vitrectomy was performed and intraoperative findings included bilateral fungal balls in the vitreous and retina with foveal traction in the left eye. Postoperatively, vision acuity was 6/24, N8 right eye and 2/60, N unable for left eye with extensive left macular scar and hole. Vitreous cultures were negative. He received multiple IVT amphotericin B and was started on topical steroid eye drops for persistent panuveitis with systemic fluconazole. Ocular improvement was seen after switching to IVT and topical voriconazole. Despite this, his ocular condition deteriorated and he developed neovascular glaucoma requiring 3 topical antiglaucoma agents. Panretinal photocoagulation was subsequently performed.Outcomes:At 3 months’ follow-up, his vision acuity remained at 6/24 for right eye and 2/60 for the left eye. There was no recurrence of inflammation or infection in both eyes.Lessons:Voriconazole could serve as a promising broad spectrum tri-azole agent in cases of failure in first-line treatment or drug-resistant fungus.  相似文献   
6.

Objective

To evaluate the surface and wettability characteristics and the microbial biofilm interaction of graphene coating on titanium.

Methods

Graphene was deposited on titanium (Control) via a liquid-free technique. The transfer was performed once (TiGS), repeated two (TiGD) and five times (TiGV) and characterized by AFM (n = 10), Raman spectroscopy (n = 10), contact angle and SFE (n = 5). Biofilm formation (n = 3) to Streptococcus mutans, Enterococcus faecalis, Pseudomonas aeruginosa and Candida albicans was evaluated after 24 h by CV assay, CFU, XTT and confocal microscopy. Statistics were performed by one-way Anova, Tukey’s tests and Pearson’s correlation analysis at a pre-set significance level of 5 %.

Results

Raman mappings revealed coverage yield of 82 % for TiGS and ≥99 % for TiGD and TiGV. Both TiGD and TiGV presented FWHM > 44 cm?1 and ID/IG ratio < 0.12, indicating multiple graphene layers and occlusion of defects. The contact angle was significantly higher for TiGD and TiGV (110° and 117°) comparing to the Control (70°). The SFE was lower for TiGD (13.8 mN/m) and TiGV (12.1 mN/m) comparing to Control (38.3 mN/m). TiGD was selected for biofilm assays and exhibited significant reduction in biofilm formation for all microorganisms compared to Control. There were statistical correlations between the high contact angle and low SFE of TiGD and decreased biofilm formation.

Significance

TiGD presented high quality and coverage and decreased biofilm formation for all species. The increased hydrophobicity of graphene films was correlated with the decreased biofilm formation for various species.  相似文献   
7.
Changes in the epigenetic landscape of immune cells are a crucial component of gene activation during the induction of inflammatory responses, therefore it has been hypothesized that epigenetic modulation could be employed to restore homeostasis in inflammatory scenarios. Fungal pathogens cause a large burden of morbidity and even mortality due to the hyperinflammatory processes that induce mucosal, allergic or systemic infections. Bromodomain and extraterminal domain (BET) proteins are considered as one as the most tantalizing pharmacological targets for the modulation of inflammatory responses at the epigenetic level. Nothing is known of the role of BET inhibitors on the inflammation induced by fungal pathogens. In the present study, we assessed the in vitro efficacy of the small molecular histone mimic BET inhibitor I‐BET151 to modulate innate immune responses during fungal–immune interaction with the clinically relevant fungal pathogens Candida albicans and Aspergillus fumigatus. Our results prove that BET inhibitors (I‐BETs) represent an important modulator of inflammation induced by fungal pathogens: both direct production of proinflammatory cytokines and the induction of trained immunity were inhibited by I‐BET151. These modulatory effects are likely to have important potential implications in clinically relevant situations.  相似文献   
8.
9.
BackgroundVulvovaginal candidiasis (VVC) is one of the most common lower genital tract infections in women; this unpleasant and extremely embarrassing pathology is one of the main reasons for gynaecological consultation. In Gabon, the prevalence of VVC remains poorly described even though VVC is known to be the leading gynaecological condition in several countries. This retrospective cross-sectional study sought to assess the prevalence of VVC among symptomatic women in southeastern Gabon.MethodsClinical samples were collected from patients suspected to have VVC during a 2-year period (from January 2016 to December 2017). Gram staining of vaginal smears provided indications of vaginal flora and confirmed the presence of yeast. Sabouraud-chloramphenicol and chromID Candida media were used to isolate yeast, and species identification was performed using morphological tests and the Vitek 2 Compact automated system.ResultsFor the 873 patients included in this study, the prevalence of VVC was 28.52%. Eleven Candida species were identified, with greater representation of Candida albicans (82.73%) than of Non Calbicans candida (NCAC) (17.27%), which were distributed as follows: Candida famata (4.02%), Candida spp. (3.61%), Candida rugosa (3.21%), Candida lipolytica (1.61%), Candida parapsilosis (1.61%), Candida glabrata (1.21%), Candida tropicalis (0.80%), Candida krusei (0.40%), Candida dubliniensis (0.40%), and Candida sphaerica (0.40%).ConclusionThis study offers the first estimation of VVC among Gabonese women in childbearing age with the symptoms. It showed that VVC is very common in Gabon. Calbicans as the most commonly represented species.  相似文献   
10.
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