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   66967篇
  免费   7257篇
  国内免费   4516篇
耳鼻咽喉   585篇
儿科学   1095篇
妇产科学   585篇
基础医学   5369篇
口腔科学   1434篇
临床医学   8626篇
内科学   7331篇
皮肤病学   715篇
神经病学   2109篇
特种医学   2340篇
外国民族医学   10篇
外科学   5306篇
综合类   16469篇
现状与发展   15篇
一般理论   1篇
预防医学   7345篇
眼科学   1310篇
药学   7891篇
  89篇
中国医学   5742篇
肿瘤学   4373篇
  2024年   370篇
  2023年   1119篇
  2022年   2997篇
  2021年   3549篇
  2020年   3007篇
  2019年   1911篇
  2018年   1937篇
  2017年   2222篇
  2016年   1900篇
  2015年   3169篇
  2014年   3862篇
  2013年   4168篇
  2012年   5943篇
  2011年   6248篇
  2010年   4952篇
  2009年   4121篇
  2008年   4301篇
  2007年   4200篇
  2006年   3836篇
  2005年   3257篇
  2004年   2166篇
  2003年   1803篇
  2002年   1432篇
  2001年   1274篇
  2000年   1107篇
  1999年   858篇
  1998年   434篇
  1997年   439篇
  1996年   311篇
  1995年   329篇
  1994年   259篇
  1993年   169篇
  1992年   179篇
  1991年   187篇
  1990年   149篇
  1989年   122篇
  1988年   89篇
  1987年   96篇
  1986年   79篇
  1985年   50篇
  1984年   33篇
  1983年   25篇
  1982年   23篇
  1981年   11篇
  1980年   8篇
  1979年   14篇
  1964年   3篇
  1962年   4篇
  1958年   4篇
  1957年   3篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
171.
目的分析可逆性后部白质脑病综合征(RPLS)患者的临床表现及磁共振(MRI)影像学特点。方法回顾性分析115例RPLS患者的临床及影像学资料。结果 115例RPLS患者表现为血压升高(89.56%)、痫性发作(74.78%)、头痛(59.13%)、视觉障碍(32.17%)、神经系统体征(20.00%)和意识改变(15.65%),其中101例(87.83%)患者头颅MRI异常,累及枕叶(71.29%)、顶叶(59.40%)、额叶(49.50%)、颞叶(38.26%)、侧室脑旁(1.98%)、脑干(3.96%)、小脑(3.96%)、皮质(3.96%)、丘脑(0.99%)、基底节区(0.99%),病灶为等或低T1WI信号,高T2WI信号,等或低DWI信号,高ADC及FLAIR信号。治疗后随访3~60月,81例预后良好,21例预后不良,5例死亡。预后不良组头痛发生率、住院期间m RS评分≥3分及并发症比例高于预后良好组(P<0.05)。结论 RPLS的MRI表现具有特征性,结合临床表现可作出正确判断,及时治疗,改善预后。  相似文献   
172.
孟文彤  粟军  曾诚  刘霆  李建军  史青  余江  崔旭 《检验医学》2007,22(6):667-671
目的 研究共表达m-bcr/abl融合基因转录子对初诊慢性髓系白血病(CML)患者的巨核细胞形态的影响.方法 分别用逆转录-聚合酶链反应(RT-PCR)和巢式PCR检测M和m-bcr/abl融合基因转录子.盲法计数患者骨髓涂片1.0 cm×1.5 cm2面积内巨核细胞数,随机选取20个巨核细胞分类计数并测定成熟期巨核细胞直径;计数产板型巨核细胞产血小板数.结果 107例初诊CML患者M和m-bcr/abl共表达者56例,b3a2型31例,b2a2型25例.共表达m-bcr/abl的b3a2型初诊CML患者血小板数比单表达M-bcr/abl和b2a2型m-bcr/abl( )患者高(P<0.05).对巨核细胞形态观察,在b3a2和b2a2组,共表达m-bcr/abl和单表达M-bcr/abl的患者骨髓1.0 cm×1.5 cm面积内巨核细胞数、成熟巨核细胞数和直径差异均无统计学意义(P>0.05);共表达m-bcr/abl的b3a2型患者产板型巨核细胞产板数比单表达M-bcr/abl患者高(P<0.05);而b2a2型的共表达m-bcr/abl组和单表达M-bcr/abl组1.0 cm × 1.5 cm面积内巨核细胞数、成熟巨核细胞数和直径及产板型巨核细胞产板数差异均无统计学意义(P>0.05).结论 共表达m-bcr/abl的b3a2型初诊CML患者血小板数增高是由其巨核细胞产板数多造成的,而与其巨核细胞数、产板型巨核细胞数和直径无关.  相似文献   
173.
Background and ObjectiveThe incidence of incision infection after lung transplantation is prominently high which affect the prognosis. Summarizing the risk factors related to incision infection after lung transplantation contribute to the control of incision infection by pre-controlling the risk factors. The objective is to summarize risk factors related to wound infection after lung transplantation.MethodsPubMed was used to research the literature relating to the risk factors to incision infection after lung transplantation through 1990 to 2022. The retrieval strategy were Medical Subject Heading (MeSH) terms combined entry terms. Two researchers conducted the literature retrieval independently. Two researchers independently evaluate the quality of the literature and summarize the indicators.Key Content and FindingsA total of 98 researches were collected from PubMed and 8 articles described the related risk factors of incision infection after lung transplantation. All of the 8 articles were retrospective studies, of which 4 articles were grouped by the delayed chest closure (DCC) execution and the other 4 articles were grouped by the surgical site infection (SSI) occurred. Two articles performed multivariate regression analysis to determine the independent risk factors of SSI after lung transplantation and the other 6 articles compared the SSI rate in different patients population. The integrated results showed that bronchoalveolar lavages (BALs), smoking status, body mass index (BMI), diabetes, operation duration, thoracic drainage tube placement time and DCC were related to the SSI after lung transplantation.ConclusionsBALs, smoking status, BMI, diabetes, operation duration, thoracic drainage tube placement time and DCC were related to the SSI after lung transplantation.  相似文献   
174.
目的 分析住院高血压患者中真性难治性高血压(RH)检出率及临床特征,并分析合并心脑血管病(CCVD)的相关因素。方法 横断面研究纳入2015年1月1日-2018年12月31日福建医科大学附属第一医院住院的年龄≥18岁的高血压患者并筛出真性RH患者,收集患者人口学资料、原发病、合并症、血清学化验检查指标、血压控制情况、降压药应用情况等。根据是否合并CCVD分为CCVD组(n=543)及非CCVD组(n=527),分析CCVD的相关因素。结果 共纳入高血压患者18 360例,分为表观RH(n=1 566)、真性RH(n=1 070)、假性RH(n=146),占高血压患者的百分比分别为8.53%、5.83%、0.80%。年龄<30、30~<40、40~<50、50~<60、≥60岁住院高血压患者中合并真性RH患者占0.39%、0.88%、1.69%、3.95%、15.12%。体质量指数(BMI)<18.5、18.5~<24.0、24.0~<28.0、≥28.0 kg/m2住院高血压患者中合并真性RH为1.21%、3.62%、8....  相似文献   
175.
研究了用紫外法测定药用炭吸着力的可行方法。  相似文献   
176.
Phosphors-in-glass (PiGs) regarded as a promising phosphor-converter for white light emitting diodes (WLEDs) is being researched widely. However, there are few reports on the effect of changing the shape of PiGs on the color rendering index (CRI) and heat dissipation of WLEDs. In this paper, gel casting with Isobam was first attempted in preparing special-shaped PiGs successfully. It exhibited that 76 wt.% was the optimum solid content based on the rheological properties of slurry and the shrinkage of green bodies. The sintering rate should be kept at a low speed and glass transition temperature (Tg) of glass powders must be higher than sublimation temperatures (Ts) of APS and Isobam. The CRI of PiGs was increased by about 27% after changing the shape of PiGs from cylinder to dome. Most importantly, operating temperature also reduced effectively the increase of the surface area of PiGs. Therefore, changing the shape of PiGs by gel casting with Isobam is a creative way for high-power WLEDs lighting.  相似文献   
177.
Background:Coronary heart disease (CHD) chronic heart failure has high morbidity and mortality, which poses a serious threat to patients’ quality of life and life safety. For the treatment of chronic heart failure of CHD, in addition to drugs, high quality nursing measures are also very important. Cluster nursing is a high-quality nursing model based on evidence-based evidence. There is no clinical study to evaluate the effect of cluster nursing on cardiac function and quality of life of CHD patients with chronic heart failure.Methods:This is a prospective randomized controlled trial to investigate the effects of cluster nursing on cardiac function and quality of life in patients with CHD chronic heart failure. Approved by the Clinical Research Ethics Committee of our hospital, patients will be randomly assigned to either routine nursing or cluster nursing. They will be followed up for 3 months after 4 weeks of treatment. Observation indicators include: The total effective rate of cardiac function improvement, Minnesota Living with Heart Failure Questionnaire, left ventricular ejection fraction, N-terminal pro-brain natriuretic peptide, 6-minute walk test, adverse reaction, etc. Data were analyzed using the statistical software package SPSS version 25.0.Discussion:This study will evaluate the effects of cluster nursing on cardiac function and quality of life of CHD patients with chronic heart failure. The results of this study will provide clinical basis for establishing reasonable and effective nursing programs for CHD patients with chronic heart failure.  相似文献   
178.
BackgroundA growing number of studies have found a close association between thyroid hormones and thyrotrophin (TSH), and they also have prognostic significance in some cancer types; this study aimed to investigate the prognostic value of free triiodothyronine (fT3), free thyroxine (fT4), fT3/fT4, TSH, and their combination in patients with papillary thyroid carcinoma (PTC).MethodsThis study retrospectively analyzed the relevant data of 726 newly diagnosed PTC patients. Both univariate and multivariate analyses were used to predict the recurrence rate, and a risk score was established. In addition, with the use of a random survival forest, a random forest (RF) score was constructed. After calculating the area under the curve (AUC), the diagnostic efficacy of risk score, RF score, and four indicators was compared.ResultsfT3, fT4, fT3/fT4, and TSH were strongly associated with some invasive clinicopathological features and postoperative recurrence. Patients with high expression of fT4 and TSH have a high risk of recurrence. By contrast, patients with high expression of fT3 and fT3/fT4 have a low risk of recurrence. At the same time, the combined use of various indicators is more helpful for establishing an accurate diagnosis. By comparison, we found that the RF score was better than the risk score in terms of predicting the recurrence of PTC.ConclusionThe diagnostic accuracy of a combination of fT3, fT4, fT3/fT4, and TSH can help improve our clinical estimate of the risk of recurrent PTC, thus allowing the development of a more effective treatment plan for patients.  相似文献   
179.
目的 分析皮瓣坏死及术后出现皮瓣相关并发症的影响因素。方法 回顾性分析因头颈肿瘤行游离皮瓣修复患者的年龄、性别、手术时长、吸烟、酗酒、高血压、糖尿病、术前放疗、血管吻合方式等对皮瓣坏死及皮瓣相关术后并发症的影响作用。结果 年龄、性别、手术时长、吸烟、酗酒、术前放疗、血管吻合方式不是头颈肿瘤患者游离皮瓣修复后皮瓣坏死及发生皮瓣相关术后并发症的危险因素;糖尿病是头颈肿瘤患者游离皮瓣修复后皮瓣坏死的危险因素(P=0.006),高血压(P=0.040)、糖尿病(P=0.024)是出现皮瓣相关术后并发症的独立危险因素。结论 在有游离皮瓣修复指征的头颈肿瘤但伴随有糖尿病、高血压疾病的患者中,经过全身情况评估后个体化选择修复方式。  相似文献   
180.
目的 观察调神疏肝针刺法治疗脑卒中后抑郁(PSD)的临床效果。方法 选取2019年6月至2021年6月福建中医药大学附属康复医院收治的80例PSD患者作为研究对象,采用信封随机数字表法将患者分为治疗组和对照组,各40例。在进行基础疾病对症治疗的基础上,治疗组予调神疏肝针刺法治疗,对照组内服抗抑郁药物盐酸氟西汀胶囊。经过8周干预治疗后,比较两组患者治疗前后的汉密尔顿抑郁量表(HAMD)、日常生活活动量表(ADL)结果及治疗有效率。结果 治疗组的治疗总有效率高于对照组,差异有统计学意义(P<0.05)。治疗前,两组患者的HAMD、ADL评分比较,差异无统计学意义(P>0.05)。治疗后,两组患者的HAMD均低于治疗前,ADL评分均高于治疗前,差异有统计学意义(P<0.05)。治疗后,治疗组的HAMD评分低于对照组,ADL评分高于对照组,差异有统计学意义(P<0.05)。结论 调神疏肝针刺法可以有效改善患者脑卒中后抑郁。  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