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   20668篇
  免费   925篇
  国内免费   132篇
耳鼻咽喉   270篇
儿科学   289篇
妇产科学   247篇
基础医学   2365篇
口腔科学   804篇
临床医学   1386篇
内科学   5407篇
皮肤病学   507篇
神经病学   1220篇
特种医学   756篇
外科学   3544篇
综合类   70篇
一般理论   1篇
预防医学   538篇
眼科学   500篇
药学   1161篇
中国医学   35篇
肿瘤学   2625篇
  2023年   114篇
  2022年   234篇
  2021年   464篇
  2020年   276篇
  2019年   333篇
  2018年   404篇
  2017年   334篇
  2016年   386篇
  2015年   377篇
  2014年   506篇
  2013年   630篇
  2012年   1167篇
  2011年   1209篇
  2010年   766篇
  2009年   585篇
  2008年   1096篇
  2007年   1139篇
  2006年   1083篇
  2005年   1063篇
  2004年   1050篇
  2003年   961篇
  2002年   970篇
  2001年   518篇
  2000年   625篇
  1999年   556篇
  1998年   261篇
  1997年   182篇
  1996年   145篇
  1995年   160篇
  1994年   128篇
  1993年   114篇
  1992年   282篇
  1991年   318篇
  1990年   292篇
  1989年   343篇
  1988年   313篇
  1987年   253篇
  1986年   237篇
  1985年   242篇
  1984年   153篇
  1983年   128篇
  1982年   75篇
  1979年   156篇
  1978年   104篇
  1977年   103篇
  1976年   75篇
  1974年   95篇
  1973年   74篇
  1972年   75篇
  1969年   69篇
排序方式: 共有10000条查询结果,搜索用时 281 毫秒
1.
Seven patients with advanced lateral oropharyngeal cancer (T3N2bM0, or T4N2bM0) underwent transoral lateral oropharyngectomy (TLO) with reconstruction performed through set-back tongue flap and polyglycolic acid (PGA) sheet. TLO was performed following en bloc resection of tumors using endoscopy. To cover the resulting defect in the lateral oropharyngeal wall, the set-back tongue flap was moved posteriorly and laterally to the area of the tongue base and lateral pharyngeal wall. The tip of the set-back tongue flap was sutured to the lateral pharynx to reconstruct the elevated tongue base and altered anterior pillar. The defect on the floor of the mouth was reconstructed using a PGA sheet. Following surgery, the mean observation period was 24 months. The mean operating time was 4 h and 2 min, with an average blood loss of 68.1 ml. All oral intake resumed on the first postoperative day via gastric tube. The mean gastric tube removal time was 1.6 postoperative days as a result of sufficient oral intake. None of the patients received postoperative radiotherapy or displayed evidence of tumor recurrence. We conclude that this novel procedure is highly effective for treating advanced oropharyngeal cancer as it demonstrates good prognostic and functional outcomes.  相似文献   
2.
Two cultivars of Japanese parsley were harvested in different seasons; their antioxidant capacities were evaluated by oxygen radical absorbance capacity (ORAC) methods, and the contents of hydrophilic and lipophilic antioxidants were compared. Japanese parsley possessed potent antioxidant capacities both in hydrophilic and lipophilic extracts when evaluated by ORAC methods. LC/MS/MS analyses revealed that chlorogenic acid and four kinds of quercetin glycosides were major antioxidants in the hydrophilic extract. Lutein was the main contributor to the antioxidant capacity of the lipophilic extract. Antioxidant capacities of the hydrophilic extracts of both cultivars tended to be higher in winter because of the increase in the contents of chlorogenic acid and quercetin glycosides. An obvious trend in the lipophilic antioxidant capacities or lutein contents was not observed irrespective of the cultivar.  相似文献   
3.
4.
5.
6.
7.
Clinical and Experimental Nephrology - The association between N-terminal pro-brain natriuretic peptide (NT-proBNP) and stroke in Japanese hemodialysis (HD) outpatients is unclear. Therefore, in...  相似文献   
8.
There have been no systematic efforts to manage and treat patients with frontotemporal dementia (FTD), but Perry described pharmacologic interventions for some behavioral syndromes in 2001. In Perry's report, selective serotonin reuptake inhibitors (SSRI) were recommended as first choice drugs because they were well tolerated and might have an effect on some symptoms such as compulsive symptoms and eating abnormalities. Some reports were presented concerning Japanese FTD patients which showed the effect of SSRI on stereotyped behaviors and eating abnormalities by Nishikawa, et al. (2001), Ikeda, et al. (2004), and others. We describe two FTD patients with compulsive complaints of pain, one mainly on abdomen and the other on lumbar region. Fluvoxamine markedly improved their complaints of pain as well as stereotyped symptoms. Fluvoxamine might be effective for behavioral disturbances due to improvement of serotoninergic dysfunction in frontal medial and cingulated cortices, as previously described. Moreover, it has been reported that an altered response to pain stimuli, either via a loss of awareness of pain or exaggerated reaction to pain, is a specific feature of FTD, but there have been only a few reports on this feature. Fluvoxamine might be effective for compulsive complaints of pain due to improvements of compulsive symptoms and exaggerated reactions to pain in FTD, or due to the analgesic effect of SSRI. SSRI may improve compulsive complaints of pain in FTD patients.  相似文献   
9.
10.
BACKGROUND: In patients with chronic kidney disease (CKD), although strong associations have been observed between malnutrition and atherosclerosis, the relationship between serum albumin concentration and angiographic changes of coronary artery disease (CAD) remains poorly explored. The goal of the present study was, in patients with CKD, to clarify the relationship between the angiographic severity of CAD and serum albumin concentration reflecting either inflammation or nutrition or both. METHODS: In this study, 100 end-stage renal disease (ESRD) patients were enrolled, who commenced long-term dialysis therapy at our hospital and underwent coronary angiography within 3 months of the first haemodialysis (HD) session. Mean age was 63+/-11 years, 20% of the subjects were female and 62% had diabetes. Severity of CAD was evaluated in terms of (i) number of vessels exhibiting CAD (>or=75% stenosis) and (ii) Gensini score (GS). Clinical characteristics and laboratory findings were recorded at initiation of long-term HD therapy. We then evaluated a possible association with the presence and degree of CAD. RESULTS: Sixty-four patients exhibited signs of CAD. Forty-one among them (64%) had multivessel disease. On univariate logistic regression analysis, age, diabetes and hypoalbuminaemia were significantly associated with multivessel CAD. Univariate linear regression analysis demonstrated a positive correlation of age and diabetes with GS, and an inverse correlation of BMI and serum albumin level with GS. Stepwise regression analysis showed age and serum albumin level to be independently associated with multivessel CAD and GS. The ROC curves demonstrated best cut-off levels of age and albumin for predicting multivessel CAD to be 70 years and 3.15 g/dl, respectively. CONCLUSION: Hypoalbuminaemia at the initiation of dialysis is an important predictor of advanced CAD, particularly in male and in diabetic patients. It may reflect mainly a state of inflammation. However, malnutrition as a confounding factor cannot be entirely excluded.  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