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   21969篇
  免费   2028篇
  国内免费   460篇
耳鼻咽喉   53篇
儿科学   1028篇
妇产科学   214篇
基础医学   1523篇
口腔科学   172篇
临床医学   3787篇
内科学   4163篇
皮肤病学   138篇
神经病学   477篇
特种医学   549篇
外科学   983篇
综合类   4632篇
现状与发展   2篇
预防医学   2564篇
眼科学   131篇
药学   2584篇
  56篇
中国医学   1184篇
肿瘤学   217篇
  2024年   57篇
  2023年   450篇
  2022年   779篇
  2021年   1708篇
  2020年   1746篇
  2019年   727篇
  2018年   720篇
  2017年   880篇
  2016年   1001篇
  2015年   931篇
  2014年   1738篇
  2013年   1756篇
  2012年   1499篇
  2011年   1582篇
  2010年   1084篇
  2009年   975篇
  2008年   840篇
  2007年   963篇
  2006年   834篇
  2005年   710篇
  2004年   766篇
  2003年   778篇
  2002年   323篇
  2001年   255篇
  2000年   183篇
  1999年   177篇
  1998年   131篇
  1997年   123篇
  1996年   110篇
  1995年   89篇
  1994年   81篇
  1993年   54篇
  1992年   76篇
  1991年   58篇
  1990年   34篇
  1989年   35篇
  1988年   37篇
  1987年   31篇
  1986年   17篇
  1985年   21篇
  1984年   16篇
  1983年   14篇
  1982年   14篇
  1981年   9篇
  1980年   11篇
  1979年   8篇
  1978年   4篇
  1977年   4篇
  1976年   5篇
  1973年   3篇
排序方式: 共有10000条查询结果,搜索用时 78 毫秒
81.
合肥市部分人群SARS认知及行为态度   总被引:4,自引:1,他引:3  
目的 了解合肥市部分人群对 SARS的认知情况及行为态度。方法 对合肥市两个社区及一所大学的部分人群共 1332人进行现况调查 ,比较不同性别、职业、文化程度对 SARS的总体认知水平。结果 合肥市人群对 SARS的认知情况尚好 ,总体平均得分 ( 15 .0 2± 1.98)分 (总分 18分 )。结论 合肥市居民对 SARS的认知水平总体较高 ,但存在群体差异 ,卫生行政部门应加强对公众的宣传教育 ,以提高全体居民的健康意识 ,进而预防 SARS的发生  相似文献   
82.
An outbreak of Pneumocystis carinii pneumonia (PCP) in three patients within a 6 week period was reported. Two patients had acute lymphoblastic leukaemia and one had brain-stem glioma. They shared common features of immuno-suppression and absence of cotrimoxazole prophylaxis and had been nursed in the same room. The severity of PCP and its response to treatment may be related to the degree of immunosuppression. Because of the morbidity and mortality of PCP, chemoprophylaxis should be given to all at-risk cases. Furthermore, isolation of patients with PCP should be considered in view of increasing evidence of nosocomial transmission.  相似文献   
83.
We describe a patient with severe combined immunodeficiency and transplacental transfer of maternal T cells who received an unfractionated HLA-identical sibling bone marrow transplant without prior conditioning. He presented prior to transplantation with a dermatitis later diagnosed as mild graft versus host disease. He had a normal absolute lymphocyte count, but proliferative responses to mitogens were very low. Antigens of the noninherited maternal HLA haplotype were detected on his blood lymphocytes. After transplantation, he developed a severe reaction including fever, cutaneous erythema and hepatosplenomegaly. Lymphocytes carrying the noninherited maternal HLA haplotype disappeared from his circulation, and his unprimed mononuclear cells became spontaneously cytotoxic to maternal lymphoblasts. He subsequently developed a lymphocytosis of 69,000/mm3, diarrhea, elevated transaminases and a worsening rash, necessitating treatment with immunosuppressive agents. Full T-cell engraftment and evidence of B-cell function later ensued and spontaneously cytotoxic lymphocytes against maternal cells disappeared by 47 days post-transplantation. We postulate that the patient's constellation of signs and symptoms after transplantation represented a combination of severe graft versus graft and mild graft versus host reactions.  相似文献   
84.
目的研究重型颅脑损伤后早期鼻饲生大黄粉对防治上消化道出血的作用.方法选择GCS3~8分重型颅脑损伤患者90例,随机选45例(实验组)伤后早期(24~48h)鼻饲生大黄粉,另45例(对照组)未予生大黄粉治疗.所有患者其他治疗措施均基本相同.结果39例患者出现上消化道出血.其中实验组14例,有13例上消化道出血治愈,治愈时间(7.6±2.5)d;对照组25例,有16例上消化道出血治愈,治愈时间(13.4±3.3)d.实验组上消化道出血率和上消化道出血治愈平均时间均显著低于对照组(P<0.05),而上消化道出血治愈率显著高于对照组(P<0.05).结论早期鼻饲生大黄粉能有效防治重型颅脑损伤后并发上消化道出血,值得临床推广应用.  相似文献   
85.
脑卒中后遗症老年人易患肺炎及其影响预后的因素   总被引:1,自引:1,他引:0  
目的分析影响脑卒中后遗症老年人易患肺炎及其影响预后的因素。方法分析117例脑卒中后遗症老年人因肺炎而反复住院的病史资料,对存活与病死不同转归的病人进行比较。结果53例死亡,占45.3%。单因素分析显示性别、卧床不起时间、吞咽反射障碍、血清白蛋白水平是影响脑卒中后遗症老年病人易患肺炎及其影响预后的因素。结论脑卒中后遗症老年人患肺炎及其影响预后有多方面因素,对吞咽反射障碍的病人置入鼻饲管可以改善预后。  相似文献   
86.
Abstract – Dental injuries are common following facial trauma. This article presents a rare injury: the dislocation of a third molar into the maxillary sinus after complex mandibular and maxillary tuberosity fractures. The possible mechanism and clinical treatment are discussed.  相似文献   
87.
Summary A 40-year-old, HIV-infected female patient received antibiotic treatment for a urinary tract infection. After the initial success of therapy and a symptom-free period, she developed pneumonia with septic shock and adult respiratory distress syndrome (ARDS). In spite of intensive care and respirator therapy with positive end-expiratory pressure (PEEP), she died of infectious toxic shock. Autopsy findings showed relapsing, gramnegative, bacterial pneumonia (morphologically compatible with Klebsiella pneumonia) and secondary, invasive aspergillosis. The pathogenesis and epidemiology of these unusual complications of AIDS are discussed.Abbreviations AIDS acquired immunodeficiency syndrome - ARDS adult respiratory distress syndrome - CDC Centers for Disease Control - HIV human immunodeficiency virus - PEEP positive end-expiratory pressure  相似文献   
88.
The study of the micro and macro-hemorrheologic changes and theflow conditions of the nail-fold microcirculation in 30 patients with severe viralhepatitis was reported.Normal individuals,and patients with acute icterichepatitis or chronic active hepatitis were employed as the controls.The changes observed in the patients with severe viral hepatitis were asfollows:The reduced viscosity of the whole blood and the plasma viscosityincreased markedly;the dispersion rate of the values of blood viscosity increasedas the clinical state of the patient became worse;and the factors increasing theblood viscosity(i.e.increase of the immuno-globulin level,prolongation of theerythrocyte electrophoretic mobility time,and increase of RBC sedimentation rate)and those decreasing the blood viscosity(i.e.decrease of hematocrit reading,fibrinogen level and platelet aggregation ratio)existed simultaneously in thepatient.The changes of the flow conditions of the nail-fold microcirculation werein close correlation with the increase of blood viscosity and the severity of thedisease.The etiology and mechanism of the above mentioned changes were discussed  相似文献   
89.
重组人生长激素在重型颅脑损伤中的应用   总被引:4,自引:0,他引:4  
目的探讨重组的人生长激素(rhGH)在重型颅脑损伤患者中的应用价值。方法46例重型颅脑损伤患者在肠内、肠外营养支持的基础上分成rhGH组与对照组,rhGH组伤后第7天每日皮下注射思增8IU,共10d。应用后第7、14日检测血清总蛋白、白蛋白、转铁蛋白及前白蛋白。结果rhGH组(n=20)第14天血清总蛋白、白蛋白、转铁蛋白及前白蛋白浓度高于对照组(n=26)(P<0.05)。结论重型颅脑损伤患者应用rhGH能改善机体对营养底物的利用率,促进蛋白合成、减轻重型颅脑损伤后低蛋白血症。  相似文献   
90.
Blood platelets in severely injured burned patients   总被引:2,自引:0,他引:2  
Unbelievable decrease of blood-platelet in the severely burned patients during the treatment of skingrafting caused two patients to unexpected death. From the records of changes of platelet number, a certain ‘platelet curve’ was made. By observing the curve, our treatments of skingrafting were carried out during the stable period and from then on we had no death cases.  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