全文获取类型
收费全文 | 13069篇 |
免费 | 819篇 |
国内免费 | 269篇 |
专业分类
耳鼻咽喉 | 703篇 |
儿科学 | 127篇 |
妇产科学 | 121篇 |
基础医学 | 2387篇 |
口腔科学 | 1457篇 |
临床医学 | 909篇 |
内科学 | 1022篇 |
皮肤病学 | 279篇 |
神经病学 | 525篇 |
特种医学 | 633篇 |
外国民族医学 | 10篇 |
外科学 | 1333篇 |
综合类 | 1638篇 |
现状与发展 | 1篇 |
预防医学 | 231篇 |
眼科学 | 679篇 |
药学 | 664篇 |
9篇 | |
中国医学 | 276篇 |
肿瘤学 | 1153篇 |
出版年
2024年 | 18篇 |
2023年 | 130篇 |
2022年 | 237篇 |
2021年 | 407篇 |
2020年 | 357篇 |
2019年 | 338篇 |
2018年 | 360篇 |
2017年 | 342篇 |
2016年 | 355篇 |
2015年 | 385篇 |
2014年 | 688篇 |
2013年 | 657篇 |
2012年 | 657篇 |
2011年 | 664篇 |
2010年 | 644篇 |
2009年 | 609篇 |
2008年 | 613篇 |
2007年 | 583篇 |
2006年 | 557篇 |
2005年 | 512篇 |
2004年 | 451篇 |
2003年 | 405篇 |
2002年 | 336篇 |
2001年 | 344篇 |
2000年 | 288篇 |
1999年 | 299篇 |
1998年 | 247篇 |
1997年 | 256篇 |
1996年 | 246篇 |
1995年 | 193篇 |
1994年 | 180篇 |
1993年 | 175篇 |
1992年 | 164篇 |
1991年 | 165篇 |
1990年 | 131篇 |
1989年 | 147篇 |
1988年 | 115篇 |
1987年 | 96篇 |
1986年 | 99篇 |
1985年 | 103篇 |
1984年 | 108篇 |
1983年 | 47篇 |
1982年 | 78篇 |
1981年 | 78篇 |
1980年 | 74篇 |
1979年 | 47篇 |
1978年 | 45篇 |
1977年 | 31篇 |
1976年 | 29篇 |
1975年 | 22篇 |
排序方式: 共有10000条查询结果,搜索用时 31 毫秒
1.
Syed M. Gilani Muhammad Khan Andrea Barbieri Manju L. Prasad 《Diagnostic Histopathology》2021,27(6):263-271
Anaplastic thyroid carcinoma (ATC) is an aggressive thyroid malignancy with high mortality rate. This malignancy arises in thyroid follicular cells either denovo or with an associated differentiated thyroid carcinoma component. Clinically, it usually presents as a rapidly enlarging mass, pain and locally compressive symptoms. Histopathologic variability and heterogeneity often pose diagnostic challenges, especially in scant and paucicellular specimens. This article describes the clinical, histopathologic and molecular features of ATC and also addresses the associated diagnostic limitations and challenges. 相似文献
2.
Qing-Yang Que Lin-Cheng Zhang Jia-Qi Bao Sun-Bin Ling Xiao Xu 《World journal of gastrointestinal surgery》2022,14(5):397-408
Over the last 40 years, the incidence and prevalence of gastroenteropancreatic neuroendocrine neoplasms (GEP-NENs) have continued to increase. Compared to other epithelial neoplasms in the same organ, GEP-NENs exhibit indolent biological behavior, resulting in more chances to undergo surgery. However, the role of surgery in high-grade or advanced GEP-NENs is still controversial. Surgery is associated with survival improvement of well-differentiated high-grade GEP-NENs, whereas poorly differentiated GEP-NENs that may benefit from resection require careful selection based on Ki67 and other tissue bio markers. Additionally, surgery also plays an important role in locally advanced and metastatic disease. For locally advanced GEP-NENs, isolated major vascular involvement is no longer an absolute contraindication. In the setting of metastatic GEP-NENs, radical intended surgery is recommended for patients with low-grade and resectable metastases. For unresectable metastatic disease, a variety of surgical approaches, including cytoreduction of liver metastasis, liver transplantation, and surgery after neoadjuvant treatment, show survival benefits. Primary tumor resection in GEP-NENs with unresectable metastatic disease is associated with symptom control, prolonged survival, and improved sensitivity toward systemic therapies. Although there is no established neoadjuvant or adjuvant strategy, increasing attention has been given to this emerging research area. Some studies have reported that neoadjuvant therapy effectively reduces tumor burden, improves the effectiveness of subsequent surgery, and decreases surgical complications. 相似文献
3.
Glaucoma is a leading cause of irreversible blindness. The use of topical eye drops to reduce intraocular pressure remains the mainstay treatment. These eye drops frequently contain preservatives designed to ensure sterility of the compound. A growing number of clinical and experimental studies report the detrimental effects of not only these preservatives but also the active pharmaceutical compounds on the ocular surface, with resultant tear film instability and dry eye disease. Herein, we critically appraise the published literature exploring the effects of preservatives and pharmaceutical compounds on the ocular surface. 相似文献
4.
5.
《The ocular surface》2020,18(1):108-113
PurposeAromatase inhibitors (AIs) limit the synthesis of oestrogen in peripheral tissues thus lowering levels of oestrogen. The primary aim was to evaluate whether women treated with AIs have altered dry eye symptoms and signs. A sub-aim was to investigate whether symptoms of dry eye in postmenopausal women were associated with symptoms of non-eye pain, ocular pain and self-rated pain perception.MethodsThis cross-sectional, observational, single visit study recruited 56 postmenopausal women (mean age 64.1 + 7.9 years) and 52 undergoing AI treatment (mean age 66.6 + 9.0). Ocular symptoms (OSDI, MGD14) and pain questionnaires (PSQ, OPAS) were administered and signs of dry eye and meibomian gland dysfunction were evaluated.ResultsAlmost half of each group reported dry eye symptoms, defined as OSDI>12 (48% control, 46% AI). The PSQ score was significantly higher in the AI group (p = 0.04). Neither frequency or severity of dry eye (or MGD) symptoms scores were significantly different between groups. In the AI group, meibomian gland expressibility score was worse (p = 0.003); there were no differences in any other signs. Higher OSDI scores were associated with higher OPAS eye-pain scores (r = 0.49, p < 0.001), but not OPAS non-eye pain (r = 0.09, p = 0.35). Pain perception (PSQ) showed a moderate positive association with OPAS eye-pain (r = 0.30, p = 0.003).ConclusionsIn this study elevated ocular symptoms were observed in both the AI treated and the untreated groups, with no difference between the groups. Women undergoing AI treatment for early stage breast cancer had worse meibum expressibility score and increased pain perception compared to an untreated group of women. 相似文献
6.
7.
《The ocular surface》2020,18(4):657-662
PurposeTo determine if meibomian gland architecture in a pediatric population is impacted by body mass index (BMI).MethodsProspective evaluation of 175 eyes of 175 pediatric patients from two clinics. Demographic and clinical information were reviewed. Symptoms of dry eye were assessed with the Standard Patient Evaluation of Eye Dryness (SPEED) questionnaire. Meibography was performed and grading of images was performed by a masked rater using a previously validated 5-point meiboscale (0–4) for gland atrophy and a 3-point score (0–2) for gland tortuosity.Results175 eyes of 175 participants aged 4–17 years (11.6 ± 3.7 years) were imaged. The mean meiboscore was 0.82 ± 0.94 (range 0–4) and the mean gland tortuosity score was 0.53 ± 0.70 (range 0–2). Ninety-six patients (56%) showed evidence of gland atrophy (meiboscore greater than 0) and the majority of patients (n=50, 29%) had a gland tortuosity score of 1. The mean BMI was 20.5 ± 4.86 kg/m2 with 39.4% of patients (n = 69) above the 85th percentile. BMI percentile was not found to be a significant predictor of a meiboscore greater than 0 (odds ratio (OR) 1.004 95% confidence interval (CI) (0.99–1.10, p = 0.41). However, BMI percentile was found to be a significant predictor of gland tortuosity score (OR 1.01 95% CI (1.00–1.02), p = 0.02). Patients with BMI percentiles between 41 and 60 were 3.79 times more likely to have a gland tortuosity score of greater than 0 than patients with BMI percentiles between 0 and 20 (OR 3.789 CI (1.17–12.24)). No significant associations were found between age, race, or sex and meiboscore or tortuosity. There was a trend towards reduction in lipid layer thickness with increasing BMI percentile (p = 0.028, r2 = 0.04).ConclusionIn this pediatric population, there was an association between meibomian gland tortuosity and higher percentiles of BMI. Future studies are needed to elucidate the pathogenesis of meibomian gland tortuosity and atrophy in pediatric patients. 相似文献
8.
9.