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   147726篇
  免费   13573篇
  国内免费   6765篇
耳鼻咽喉   1538篇
儿科学   2892篇
妇产科学   3127篇
基础医学   15057篇
口腔科学   2460篇
临床医学   18850篇
内科学   21175篇
皮肤病学   2064篇
神经病学   6959篇
特种医学   5215篇
外国民族医学   22篇
外科学   14066篇
综合类   23326篇
现状与发展   29篇
一般理论   15篇
预防医学   12301篇
眼科学   3424篇
药学   15643篇
  178篇
中国医学   8929篇
肿瘤学   10794篇
  2024年   474篇
  2023年   1827篇
  2022年   4576篇
  2021年   6292篇
  2020年   4724篇
  2019年   4110篇
  2018年   4508篇
  2017年   4356篇
  2016年   4063篇
  2015年   6130篇
  2014年   7741篇
  2013年   8749篇
  2012年   12391篇
  2011年   12650篇
  2010年   9146篇
  2009年   7864篇
  2008年   9351篇
  2007年   9111篇
  2006年   8383篇
  2005年   7211篇
  2004年   5694篇
  2003年   5247篇
  2002年   4364篇
  2001年   3384篇
  2000年   2816篇
  1999年   2156篇
  1998年   954篇
  1997年   862篇
  1996年   739篇
  1995年   645篇
  1994年   620篇
  1993年   401篇
  1992年   818篇
  1991年   689篇
  1990年   628篇
  1989年   563篇
  1988年   487篇
  1987年   475篇
  1986年   389篇
  1985年   327篇
  1984年   247篇
  1983年   196篇
  1982年   123篇
  1981年   136篇
  1980年   104篇
  1979年   209篇
  1978年   163篇
  1977年   109篇
  1976年   110篇
  1974年   104篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
51.
新生儿胃穿孔14例治疗体会   总被引:5,自引:0,他引:5  
目的 探讨新生儿胃穿孔的发病特点和治疗方法。方法 对我院近 10年治疗的 14例新生儿胃穿孔进行回顾性分析。结果  14例新生儿胃穿孔皆行手术治疗 ,术后死亡 7例。结论 新生儿胃穿孔多因先天性胃壁肌层发育不良及胃内张力增高缺血缺氧所致。早期诊断 ,及时手术 ,减少并发症及术后加强支持疗法是提高本病治愈率的关键  相似文献   
52.
目的 探讨SARS流行期间肺炎患者的临床表现和胸部影像变化特点。方法 对76例SARS流行期间发热留观室收治的肺炎患者的临床表现及胸部影像进行分析。结果 (1)此组肺炎患者多为青壮年(占60.53%),无固定职业或职业性质流动性较大者居多(69.74%);(2)临床特征主要是发热,以中高热为多见(80.26%),发病早期部分患者呼吸道症状并不明显(67.10%),外周血WBC在正常或低于正常范围(85.53%),淋巴细胞比例减少(75.00%);(3)肺部CT表现为不同程度的炎性浸润;病灶形态以斑片状和球形多见(77.63%);病灶常位于肺周边,常出现支气管气像;动态观察病变影像大多无明显进展(88.16%%),经治疗均完全吸收。结论 SARS流行期间普通肺炎与非典型肺炎有相似的临床及胸部影像表现;肺部CT扫描能早期发现肺炎患者的异常阴影,明显优于胸片,但无特异性。因此,在SARS流行期间发热诊室医务人员应加强肺部炎性改变的早期诊断和鉴别诊断水平。  相似文献   
53.
一次和多次住院精神分裂症患者再住院分析   总被引:9,自引:0,他引:9  
目的 :比较 1次和≥ 2次住院精神分裂症患者出院后的再住院率 ,初步探讨影响再住院的相关因素。 方法 :1999年度出院的 833例住院精神分裂症患者纳入调查 ,使用自制的再住院及其相关因素调查表 ,于 2 0 0 3年 12月底前电话或入户调查出院后至少 4 8个月的情况。 结果 :6 6 4例完成调查 ,分为 1次住院组 (333例 )和多次住院组 (331例 )。用生存分析 (Kaplan Meier公式 )比较两组未再住院率 ,12个月末 (分别为 6 7 0 %和 6 1 6 % )、2 4个月末 (5 6 2 %和 4 8 9% )、36个月末 (4 6 0和 35 1% )和 4 8个月末 (4 1 1%和 2 8 7% )。Cox回归风险比例模型分析影响再住院的相关因素显示 ,与药物依从性、生活事件、自知力和家庭照顾相关 (P <0 0 5 ) ,药物依从性对再住院的贡献值 (1 719)最大。 结论 :1次住院精神分裂症患者出院后的再住院率较多次住院者低。药物依从性是影响再住院的主要因素  相似文献   
54.
薛颖 《中华现代护理杂志》2007,13(15):1385-1386
总结2例腹腔镜下阴道癌根治及阴道重建手术的手术配合经验.提出术前做好心理护理、肠道准备,熟悉手术步骤、手术者的手术特点,熟练掌握手术器械的使用方法,与术者默契配合,是保证手术成功的关键措施.  相似文献   
55.
Piceatannol (3,4,3',5'-tetrahydroxy-trans-stilbene) (NSC 365798) has recently been isolated and was subsequently synthesized for NCI tumor panel testing as a new antileukemic natural product from the seeds of Euphorbia lagascae. During the synthesis, a bioactive reaction mixture of several partially O-methylated piceatannol analogues was obtained. This mixture has now been maximized and subjected to bioactivity-directed fractionation, using brine shrimp lethality, to yield 3,3',5'-tri-O-methylpiceatannol (NSC 381281); this new compound has improved stability and better bioactivity in several systems than piceatannol itself. To confirm the structure, 5 was synthesized from vanillin. In addition, the isovanillin analogue, 4,3',5'-tri-O-methylpiceatannol (NSC 381864), another new compound, was synthesized and found to be bioactive.  相似文献   
56.
Background Health-related quality of life (HRQL) is an accepted outcome measure in patients with mood and anxiety disorders. Yet, surprisingly little attention has been paid to the determinants. In this paper we test the hypothesis that it is associated with personality traits while controlling for mental disorders. Methods A large sample of outpatients (n=640) with mood and anxiety disorders was studied. The empirically supported five factor model of normal personality traits was assessed using the NEO-FFI and includes: neuroticism, extraversion, openness to experience, agreeableness, and conscientiousness. Mental disorders were assessed with the CIDI, and HRQL with the SF-36. Results Regression analyses revealed that the NEO-FFI scores, with the exception of conscientiousness, were significantly associated with SF-36 subscales and summary scores, independently from the mental disorders. The percentage of explained variance due to the personality traits was highest for the subscales Vitality (10.0%), Mental Health (13.3%) and the Mental Health Summary Score (9.5%). Furthermore, specific personality traits were related to specific SF-36 subscales. Conclusions A low HRQL of patients with mood or anxiety disorders is not only determined by the disease or the current health but is also shaped by personality traits that are relatively stable throughout an individual's life time.  相似文献   
57.
Public health law has been one of the leading contributors to the extension of life expectancy in the 20th century. Nonetheless, the legal infrastructure supporting public health law in the United States is underdeveloped and nonuniform. With national interest growing in public health agency accreditation, the individual legal approach taken by states may pose an obstacle to wholesale adoption of a proposed voluntary national model. This article describes the legal foundations supporting accreditation or assessment programs in states participating in the Multi-State Learning Collaborative, a project funded by the Robert Wood Johnson Foundation. The Turning Point Model State Public Health Act is recommended as one option to resolve the current impasse, assist in acceptance of a national accreditation model, and provide a common public health legal infrastructure.  相似文献   
58.
Zinc phosphide ingestion: a case report and review   总被引:1,自引:0,他引:1  
We present the case of a patient who attempted suicide by ingestion of the rodenticide zinc phosphide. Zinc phosphide manifests its immediate toxicity through production of phosphine gas. Signs and symptoms of toxicity include nausea, vomiting, dyspnea, and changes in mental status; immediate death results from pulmonary edema. Delayed effects are secondary to the absorption of phosphide, affecting primarily the liver, heart and kidneys. Delayed deaths are related to a direct cardiotoxicity. Treatment is mainly symptomatic and supportive; aggressive airway management and circulatory support are critical to a successful outcome.  相似文献   
59.
60.
While two prophylactic HPV vaccines have been proven notably efficacious in clinical trials, the effectiveness of these vaccines at the population level remains to be evaluated. To lay the foundation for understanding the strengths and limitations of different endpoints for future effectiveness research, we present a comprehensive review of HPV-related clinical outcomes, including: (i) HPV type-specific positivity and persistence, (ii) Pap diagnoses (ASC-US, LSIL, and HSIL), (iii) histologic cervical cancer precursor lesions (i.e., CIN1, CIN2, and CIN3), (iv) invasive cervical cancer (ICC), (v) anogenital warts, (vi) recurrent respiratory papillomatosis (RRP), and (vii) other HPV-associated cancers (vulvar, vaginal, anal, penile, and oropharyngeal). While research on the vaccines’ effects on these HPV clinical outcomes in the general population is presently limited, numerous large trials will soon be completed, making a priori discussion of these potential outcomes especially urgent. Furthermore, population level systems to track HPV-associated clinical outcomes may need to be developed for HPV vaccine effectiveness evaluation.  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