全文获取类型
收费全文 | 19880篇 |
免费 | 1010篇 |
国内免费 | 390篇 |
专业分类
耳鼻咽喉 | 875篇 |
儿科学 | 555篇 |
妇产科学 | 343篇 |
基础医学 | 2639篇 |
口腔科学 | 1779篇 |
临床医学 | 1683篇 |
内科学 | 1666篇 |
皮肤病学 | 365篇 |
神经病学 | 1077篇 |
特种医学 | 1180篇 |
外国民族医学 | 4篇 |
外科学 | 3221篇 |
综合类 | 2389篇 |
现状与发展 | 1篇 |
预防医学 | 437篇 |
眼科学 | 845篇 |
药学 | 890篇 |
12篇 | |
中国医学 | 340篇 |
肿瘤学 | 979篇 |
出版年
2024年 | 35篇 |
2023年 | 219篇 |
2022年 | 526篇 |
2021年 | 633篇 |
2020年 | 557篇 |
2019年 | 494篇 |
2018年 | 485篇 |
2017年 | 514篇 |
2016年 | 525篇 |
2015年 | 570篇 |
2014年 | 1023篇 |
2013年 | 1079篇 |
2012年 | 940篇 |
2011年 | 976篇 |
2010年 | 959篇 |
2009年 | 966篇 |
2008年 | 978篇 |
2007年 | 920篇 |
2006年 | 904篇 |
2005年 | 835篇 |
2004年 | 701篇 |
2003年 | 631篇 |
2002年 | 486篇 |
2001年 | 483篇 |
2000年 | 399篇 |
1999年 | 411篇 |
1998年 | 362篇 |
1997年 | 371篇 |
1996年 | 356篇 |
1995年 | 287篇 |
1994年 | 257篇 |
1993年 | 255篇 |
1992年 | 214篇 |
1991年 | 217篇 |
1990年 | 200篇 |
1989年 | 187篇 |
1988年 | 152篇 |
1987年 | 130篇 |
1986年 | 126篇 |
1985年 | 152篇 |
1984年 | 141篇 |
1983年 | 64篇 |
1982年 | 102篇 |
1981年 | 106篇 |
1980年 | 92篇 |
1979年 | 64篇 |
1978年 | 50篇 |
1977年 | 40篇 |
1976年 | 33篇 |
1975年 | 25篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
41.
The morphological changes produced in the thyroid glands of albino rats following radiation with a 904 nm infrared laser were studied. Two different levels of radiation were applied: 46.8 J/cm2 and 140.4 J/cm2. Evaluation of the changes in the densities of the epithelial, colloidal and follicular volumes and of the activation index revealed that the laser beam produced changes in the thyroid parenchyma. It was observed that there was a direct relationship between the severity of the lesion and the radiation energy applied. 相似文献
42.
Yuichi Sanada Kazuhiro Yoshida Hiroyuki Itoh Satoko Kunita Kazuto Jinushi Hideo Matsuura 《Journal of hepato-biliary-pancreatic sciences》2007,14(4):401-409
We report a case of groove pancreatitis (GP) associated with a true pancreatic cyst. An 81-year-old man who had suffered epigastric pain for 4 months was referred to Saisekai Kure Hospital. Computed tomography and endoscopic retrograde pancreatography showed a cystic lesion in the groove area of the pancreas. Serum amylase elevation and imaging findings suggested GP due to the cyst. Six weeks of medical treatment did not improve the clinical symptoms. Therefore, pancreatoduodenectomy was performed. Histologic examination revealed a true cyst with intraluminal necrosis, which produced a protein plug that obstructed the Santorini duct. The parenchyma surrounding the groove area showed marked fibrosis and inflammatory cell infiltration. GP due to true pancreatic cyst was diagnosed. Although GP is usually caused by overconsumption of alcohol, which leads to changes in the pancreatic juice and the ultimate blockage of pancreatic outflow, the histologic features in our patient suggest that true pancreatic cyst stands as a secondary cause of GP. 相似文献
43.
W. B. Quay 《Journal of neural transmission (Vienna, Austria : 1996)》1981,52(1-2):107-115
Summary Quantitative aspects of the microanatomy of the pineal gland and other neuroendocrine and circumventricular structures were studied in a small, reproductively suppressed, female Naked Mole-rat from central Kenya, Africa. The atrophic pineal is the smallest in absolute size (0.002135 mm3) of any so far described in a species of rodent, and in size relative to body weight is second only to that of another tropical species. The subcommissural organ and posterior collicular recess are also relatively small and less well differentiated than those in most other examined rodent species. In contrast, the subfornical organ, OVLT and median eminence are large and well vascularized. It is concluded that the pineal in this species follows the previously described trend among rodents of relatively smaller size in species whose centers of distribution are in lower latitudes. Although the pineal is atrophic, the Naked Mole-rat still exhibits 24-hour and seasonally timed patterns of behavior and seasonal reproduction. However, in this species these events are probably cued by moisture, temperature and social factors rather than by photic information. 相似文献
44.
本文报告乳腺积乳囊肿43例。讨论了发病原因及病理,特别提出局部肿块波动感试验阳性,A超检查显示液平段,试穿抽出乳汁,对诊断有肯定价值;治疗以手术切除为主,仅有7例穿刺抽吸乳汁得以治愈。 相似文献
45.
Introduction Suprasellar arachnoid cysts are uncommon developmental anomalies that are most often diagnosed in childhood. Because the natural history and pathogenesis of these remain poorly defined, optimal treatment guidelines are not yet established.Case report We report a case of spontaneous disappearance of a suprasellar arachnoid cyst that persisted after a ventriculoperitoneal shunt performed 10 years earlier. A 5-year-old boy presented with impaired visual acuity and urinary incontinence. Magnetic resonance (MR) imaging showed a large suprasellar cyst with noncommunicating hydrocephalus. A ventriculoperitoneal shunt was put in place to alleviate current aggravation of hydrocephalus symptoms. Because of the persistent size of the cyst and signs of brainstem compression on a repeat computed tomography (CT), we recommended surgical exploration and decompression. However, the boy’s parents declined any further surgical treatment, and the patient was subsequently lost to follow-up for 10 years. When the patient returned to our clinic at the age of 15 years, a repeat MR scan showed a complete disappearance of the cyst. His family denied any significant interval history.Discussion This case represents only the third reported case of spontaneous disappearance of a suprasellar arachnoid cyst. We discuss possible mechanisms and clinical characteristics of the disappearance of the arachnoid cyst with review of the literature. 相似文献
46.
Peter A. Blume DPM FACFAS J. Christopher Moore DPM David C. Novicki DPM FACFAS 《The Journal of foot and ankle surgery》2005,44(1):44-48
There are a number of proposed causes and treatment approaches for digital mucoid cysts. The described treatment outcomes for this cyst have been variable, with the highest success rate reported with complete excision and single-lobe skin flap closure. This report describes a bilobed flap reconstruction in conjunction with resection of the head of the middle phalanx. A retrospective review was undertaken to evaluate the recurrence rate, complications, and patient satisfaction with this combined procedure. Fifteen patients with an average follow-up of 4.6 years were evaluated. There were no recurrences, flap failures, or other major complications. The use of this flap allows for greater exposure than traditional semi-elliptical incisions while allowing the wide excisional defects to be closed primarily. 相似文献
47.
腹腔镜治疗腹腔巨大囊肿及术后下身水肿处理(附5例报告) 总被引:1,自引:1,他引:0
目的探讨腹腔镜处理腹腔巨大囊肿及术后下身水肿的方法. 方法 5例腹腔巨大囊肿先行囊肿抽液(1 500~2 000 ml,平均1 800 ml)减压,2例巨大肝囊肿采用经皮穿刺抽液,3例下腹腔囊肿在脐缘小切口直视下抽液,使腹腔空间增大后行腹腔镜下囊肿切除(3例)或开窗引流(2例).对术后出现的下身水肿口服(2例)或静脉注射(3例)利尿剂. 结果 4例术后症状完全消失,1例多囊肝症状明显改善.随访3个月~1年,症状无复发.下身水肿均在5~7 d内基本消失. 结论先行囊肿抽液减压及术后应用小剂量利尿剂可使腹腔巨大囊肿能在腹腔镜下顺利处理并恢复. 相似文献
48.
肝囊肿腹腔镜开窗引流术后复发原因的探讨 总被引:8,自引:2,他引:6
目的探讨肝囊肿腹腔镜开窗引流术后复发的原因. 方法回顾性总结1998年6月~2003年8月54例肝囊肿腹腔镜下开窗引流术的临床资料. 结果 52例随访1~6年,5例复发,复发率9.6%(5/52).3例由于囊肿位置特殊开窗过小,1例由于多发囊肿之间的透明隔未予切开,1例系多囊肝术后复发. 结论适应证选择不当、囊肿开窗过小、遗漏多发囊肿以及黏膜处理不当是导致复发的主要原因. 相似文献
49.
Persistent hip stiffness in Perthes’ disease indicates a poor prognosis and is a therapeutic challenge. We report a case of a 13-year-old boy with a stiff Perthes’ hip that was nonresponsive to prolonged nonsurgical treatment. Imaging revealed Catterall group IV Perthes’ disease in an advanced reossification stage, with a focal defect in the weight-bearing area of the capital femoral epiphysis. A focal, compressible chondral elevation was detected on hip arthroscopy; on incision, flocculent fluid was released. After the cyst was excised, microfracture revascularization of the chondral defect was undertaken. Postoperatively, the patient had immediate pain relief, correction of deformity, and restoration of painless range of motion; this has continued for 4 years since surgery was performed. Persistence of an unhealed necrotic segment in Perthes’ disease has traditionally been associated with osteochondritis dissecans; however, in this case, the unhealed and nonossified segment produced an elevated painful chondral cyst that caused spasm and stiffness of the hip. Although 2 distinct types of chondral lesions have been described in Perthes’ disease, stiffness arising because of these lesions has not been reported. Patients with this unusual third type of chondral lesion of the capital femoral epiphysis, which causes persistent stiffness in Perthes’ hip, may be identified and successfully treated with the use of arthroscopic techniques. 相似文献
50.