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   2603篇
  免费   149篇
  国内免费   80篇
耳鼻咽喉   161篇
儿科学   84篇
妇产科学   10篇
基础医学   379篇
口腔科学   186篇
临床医学   173篇
内科学   535篇
皮肤病学   378篇
神经病学   81篇
特种医学   122篇
外科学   260篇
综合类   159篇
预防医学   30篇
眼科学   102篇
药学   63篇
中国医学   39篇
肿瘤学   70篇
  2023年   54篇
  2022年   90篇
  2021年   101篇
  2020年   92篇
  2019年   98篇
  2018年   116篇
  2017年   70篇
  2016年   77篇
  2015年   92篇
  2014年   123篇
  2013年   144篇
  2012年   114篇
  2011年   109篇
  2010年   100篇
  2009年   89篇
  2008年   107篇
  2007年   124篇
  2006年   100篇
  2005年   94篇
  2004年   100篇
  2003年   79篇
  2002年   64篇
  2001年   72篇
  2000年   42篇
  1999年   45篇
  1998年   56篇
  1997年   32篇
  1996年   37篇
  1995年   43篇
  1994年   37篇
  1993年   34篇
  1992年   39篇
  1991年   31篇
  1990年   30篇
  1989年   29篇
  1988年   20篇
  1987年   18篇
  1986年   11篇
  1985年   17篇
  1984年   15篇
  1983年   10篇
  1982年   11篇
  1981年   13篇
  1980年   10篇
  1979年   7篇
  1978年   10篇
  1977年   8篇
  1976年   7篇
  1973年   4篇
  1970年   2篇
排序方式: 共有2832条查询结果,搜索用时 15 毫秒
111.
肖璇  王聪  徐祎 《口腔生物医学》2012,3(4):197-200
目的:探讨Kimura病(Kimura’s disease,KD)的临床病理学特点,提高对该病的认识及诊断。方法:分析和观察7例KD的临床资料、病理组织学表现及免疫组织化学特征。结果:7例KD患者均为男性,发病年龄21~73岁,主要表现为头颈部皮下或大唾液腺的无痛性肿块,组织学上以淋巴组织增生为主,可见淋巴滤泡形成,生发中心扩大,滤泡间见血管增生,大量嗜酸性粒细胞浸润。免疫组织化学显示KD中的淋巴滤泡表达B细胞抗原,滤泡间的淋巴细胞多表达T细胞标记。结论:KD是一种少见的淋巴组织增生性疾病,需与部分富含淋巴组织的肿瘤鉴别,组织病理学及免疫组化对其诊断具有重要意义。  相似文献   
112.
Eosinophilic Ulcer (EU) is a rare self-limiting chronic benign lesion of the oral mucosa with pathogenesis still unclear, however it may resemble malignancies, traumatic ulcerations and some infections such as deep fungal infections, tuberculosis and primary syphilis. This is a case report of a patient with EU in the lateral border of the tongue with no history of associated trauma and refractory to treatment with drugs. The ulcer rapidly healed after an incisional biopsy and the definite diagnosis was achieved only combining histologic findings and the clinical follow-up.  相似文献   
113.
114.
115.
Background: Abnormalities around titanium stapled sites are not well described in the literature. Existence

of staple granulomas or neoplasms on titanium stapled sites used in TAPP procedures is unknown.

Case: We report a case in which differentiation of suspected staple granuloma or neoplasm around a titanium staple,

used to secure the mesh in a TAPP procedure, could not be made other than by pathologic examination.

Conclusion: This case emphasises that although the appearance of the lesion may be suspected for staple granuloma,

the possibility of a malignant neoplasm should always be considered.  相似文献   
116.

BACKGROUND:

Celiac disease and eosinophilic esophagitis are usually considered to be separate gastrointestinal diseases; however, it appears that they may coexist more often than would be expected. It is unknown whether eosinophilic esophagitis in patients with celiac disease responds to a gluten-free diet.

OBJEVTIVES:

To examine the clinical, endoscopic and histological features of children with both conditions to evaluate whether eosinophilic esophagitis responds to a gluten-free diet.

METHODS:

From January 1, 2009, to June 30, 2011, the medical records of children <18 years of age diagnosed with eosinophilic esophagitis and/or celiac disease were reviewed. Patients with clinical, endoscopic and histological diagnoses of both diseases were identified and included. These findings were analyzed, as were laboratory results, treatment and follow-up.

RESULTS:

During the study period, there were 206 celiac disease patients, 86 eosinophilic esophagitis patients and nine (4.4% of total celiac) patients with both diagnoses. Gluten-free diet was the primary treatment for both conditions in seven of nine (78%) cases. In six of these seven (86%) patients, no endoscopic or histological improvement of eosinophilic esophagitis was observed, while in one patient, histological remission of esophageal eosinophilia occurred while on a gluten-free diet.

CONCLUSION:

The prevalence of eosinophilic esophagitis in patients with celiac disease was 4.4%, confirming a higher than expected prevalence of eosinophilic esophagitis compared with the general population. In patients with celiac disease, a gluten-free diet did not appear to induce remission of coexistent endoscopic and histological features of eosinophilic esophagitis.  相似文献   
117.
目的 分析嗜酸性粒细胞性胃肠炎(eosinophilic gastroenteritis,EG)的临床特点、内镜下表现、病理特点及诊治要点,以提高对该病的认识.方法 回顾性分析湖北医药学院附属太和医院消化内科2001年1月~2011年5月收治的32例EG患者临床资料,对病史、临床表现、实验室结果、内镜结果及治疗情况汇总分析.结果 32例患者黏膜型25例,浆膜型6例,黏膜-肌层混合型1例;患者多以腹痛为首发症状(84.38%);外周血和骨髓嗜酸粒细胞(ensinophils,EOS)计数明显增高(14.2% ~49.5% vs 12.5% ~42.5%);镜下表现为黏膜充血水肿、糜烂、红斑,病变多分布在胃窦部、十二指肠和结肠;活检和腹水检测有大量EOS浸润;糖皮质激素治疗后患者症状缓解,复发用药亦有效.结论 EG多以腹痛起病,胃窦部、十二指肠、结肠为常见病变部位,内镜活检和腹水中见EOS浸润有助于明确诊断,糖皮质激素疗效好.  相似文献   
118.
AIM: To examine the relative prevalence and temporal variation of dysphagia etiologies in patients undergoing upper endoscopy (EGD) over the past decade.METHODS: EGDs with the indication of dysphagia at an urban, university medical center in 1999, 2004 and 2009 were retrospectively identified from the electronic medical record. The entire patient chart, including EGD, pathology, manometry, radiographic and clinician reports, was reviewed for demographic and clinical data and to determine the etiology of dysphagia. The number of EGDs in which an esophageal biopsy was performed was also noted. Gastroesophageal reflux disease (GERD) as a cause of dysphagia independent of peptic stricture was defined by symptoms with erosive esophagitis or symptom response to proton pump inhibition (PPI). Cases of eosinophilic esophagitis (EoE) were defined by an appropriate clinical history and histological criteria of ≥ 15 eosinophils per high powered field. PPI-responsive esophageal eosinophilia was not routinely reported prior to 2008. Statistical analysis was performed using one-way analysis of variance to analyze for trends between 1999, 2004 and 2009 and a post-hoc Tukey analysis was performed following a significant main effect.RESULTS: A total of 1371 cases (mean age 54 years, 43% male) met pre-specified inclusion criteria with 191, 504 and 675 cases in 1999, 2004 and 2009, respectively. Patients were older in 2004 compared to 2009 (mean ± SD, 54.0 ± 15.7 years vs 52.3 ± 16.8 years, P = 0.02) and there were more males in 1999 compared to 2004 (57.5% vs 40.8%, P = 0.005). Overall, GERD (27.6%) and EoE (7.7%) were the most common identifiable causes of dysphagia. An unspecified diagnosis accounted for 21% of overall cases. There were no significant differences in the relative prevalence of achalasia or other motility disorders, peptic stricture, Schatzki’s ring, esophageal cancer or unspecified diagnoses over the 10-year time period. There was, however, a decrease in the relative prevalence of GERD (39.3% vs 24.1%, P < 0.001) and increases in the relative prevalence of EoE (1.6% vs 11.2%, P < 0.001) and oropharyngeal disorders (1.6% vs 4.2%, P = 0.02) from 1999 to 2009. Post-hoc analyses determined that the increase in relative prevalence of EoE was significant between 1999 and 2009 as well as 2004 and 2009 (5.4% vs 11.6%, P < 0.001), but not between 1999 and 2004 (1.6% P 5.4%, P = 0.21). On the other hand, the decrease in relative prevalence of GERD was significant between 1999 and 2009 and 1999 and 2004 (39.3% vs 27.7%, P = 0.006), but not between 2004 and 2009 (27.7% vs 24.1%, P = 0.36). There were also significantly more EGDs in which a biopsy was obtained in 1999 compared to 2009 (36.7% vs 68.7%, P < 0.001) as well as between 2004 and 2009 (37.5% vs 68.7%, P < 0.001). While total EGD volume did increase over the 10-year time period, the percentage of EGDs for the indication of dysphagia remained stable making increasing upper endoscopy an unlikely reason for the observed increased prevalence of EoE.CONCLUSION: EoE has emerged as a dominant cause of dysphagia in adults. Whether this was due to a rise in disease incidence or increased recognition is unclear.  相似文献   
119.
Purpose:To study topical timolol (0.5%) as a first-line treatment in ophthalmic pyogenic granuloma (PG) in terms of safety and efficacy.Methods:This was a prospective, interventional, single-arm study conducted at a tertiary eye care hospital in central India. Only new cases of PG were counseled to get enrolled in the study. A total of 40 patients were analyzed in the study. Topical timolol eye drop (0.5%) was started in each patient twice daily for 4–6 weeks duration. The patients were divided into five categories according to the percentage reduction in the size of PG as follows: i) 80–100% reduction - excellent responders, ii) 60–80% – good, iii) 40–60% – satisfactory, iv) 20–40% – poor, and v) <20% – very poor/nonresponder. After 6 months of starting treatment final evaluation was done.Results:The mean age of the patients was 23.5 ± 13.3 years. Etiology of the disease included chalazion (n = 11, 27.5%), trauma (n = 2, 5%), surgery (n = 7, 17.5%), foreign body (n = 2, 5%), and idiopathic (n = 18, 45%). An excellent response was achieved in 31 (77.5%) patients. Twenty-seven (67.5%) patients had complete resolution of lesions within 6 weeks. Recurrence of the lesion was not noticed in any patients.Conclusion:Timolol 0.5% in topical form is a good treatment option for ophthalmic PG in all age groups. The treatment has no adverse effects when given to suitable individuals for a limited period.  相似文献   
120.
To record the demographics, and correlate histological findings in central giant cell granulomas (CGCGs) of the jaws with their clinical behaviour, 30 paraffin-embedded samples of CGCG were retrieved from the archives of the Department of Oral Pathology and Microbiology, Subharti Dental College, Meerut, India. The diagnosis in each case was made on the basis of clinical, radiographic, and histological findings. Data about age, sex, anatomical site, presentation, radiological features, and laboratory investigations were analysed. Histomorphometric analyses were made in each case with respect to the number of giant cells, mean number of nuclei and giant cells, fractional surface area occupied by giant cells, index of relative size, and mitotic activity. The peak incidence of CGCG was during the second decade of life with a slight female predilection, and the mandible was the most common site. Of the 30 samples considered, 20 tumours were classified clinically as non-aggressive, and 10 as aggressive, based on their clinical behaviour. Histomorphometric analysis showed significant changes between the two groups with respect to the number of giant cells, the fractional surface area, and the mitotic activity. The data obtained showed clinical and histomorphometric features that may be reliable indicators for the differentiation between aggressive and non-aggressive CGCG. These data should be taken into consideration to improve planning of individual treatment and follow-up.  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