全文获取类型
收费全文 | 3175篇 |
免费 | 144篇 |
国内免费 | 18篇 |
专业分类
耳鼻咽喉 | 7篇 |
儿科学 | 27篇 |
妇产科学 | 18篇 |
基础医学 | 396篇 |
口腔科学 | 47篇 |
临床医学 | 218篇 |
内科学 | 751篇 |
皮肤病学 | 206篇 |
神经病学 | 155篇 |
特种医学 | 451篇 |
外科学 | 432篇 |
综合类 | 12篇 |
预防医学 | 45篇 |
眼科学 | 11篇 |
药学 | 138篇 |
中国医学 | 8篇 |
肿瘤学 | 415篇 |
出版年
2023年 | 13篇 |
2022年 | 30篇 |
2021年 | 56篇 |
2020年 | 39篇 |
2019年 | 48篇 |
2018年 | 62篇 |
2017年 | 60篇 |
2016年 | 82篇 |
2015年 | 83篇 |
2014年 | 122篇 |
2013年 | 139篇 |
2012年 | 177篇 |
2011年 | 237篇 |
2010年 | 117篇 |
2009年 | 89篇 |
2008年 | 191篇 |
2007年 | 240篇 |
2006年 | 216篇 |
2005年 | 219篇 |
2004年 | 213篇 |
2003年 | 212篇 |
2002年 | 192篇 |
2001年 | 60篇 |
2000年 | 37篇 |
1999年 | 40篇 |
1998年 | 35篇 |
1997年 | 43篇 |
1996年 | 40篇 |
1995年 | 29篇 |
1994年 | 24篇 |
1993年 | 23篇 |
1992年 | 24篇 |
1991年 | 17篇 |
1990年 | 13篇 |
1989年 | 23篇 |
1988年 | 11篇 |
1987年 | 8篇 |
1986年 | 11篇 |
1985年 | 9篇 |
1984年 | 12篇 |
1983年 | 8篇 |
1982年 | 7篇 |
1981年 | 7篇 |
1980年 | 5篇 |
1979年 | 2篇 |
1978年 | 2篇 |
1977年 | 3篇 |
1976年 | 3篇 |
1974年 | 1篇 |
1972年 | 1篇 |
排序方式: 共有3337条查询结果,搜索用时 15 毫秒
71.
72.
Hyungjin Kim Jeong Min Lee Jeong Hee Yoon Jin-Young Jang Sun-Whe Kim Ji Kon Ryu Stephan Kannengiesser Joon Koo Han Byung Ihn Choi 《Korean journal of radiology》2015,16(6):1216-1225
ObjectiveTo investigate the image quality (IQ) and apparent diffusion coefficient (ADC) of reduced field-of-view (FOV) di-ffusion-weighted imaging (DWI) of pancreas in comparison with full FOV DWI.ResultsOn qualitative analysis, reduced FOV DWI showed better anatomic structure visualization (2.76 ± 0.79 at b = 0 s/mm2 and 2.81 ± 0.64 at b = 400 s/mm2), lesion conspicuity (3.11 ± 0.99 at b = 0 s/mm2 and 3.15 ± 0.79 at b = 400 s/mm2), IQ score (8.51 ± 2.05 at b = 0 s/mm2 and 8.79 ± 1.60 at b = 400 s/mm2), and higher clinical utility (3.41 ± 0.64), as compared to full FOV DWI (anatomic structure, 2.18 ± 0.59 at b = 0 s/mm2 and 2.56 ± 0.47 at b = 500 s/mm2; lesion conspicuity, 2.55 ± 1.07 at b = 0 s/mm2 and 2.89 ± 0.86 at b = 500 s/mm2; IQ score, 7.13 ± 1.83 at b = 0 s/mm2 and 8.17 ± 1.31 at b = 500 s/mm2; clinical utility, 3.14 ± 0.70) (p < 0.05). Artifacts were significantly improved on reduced FOV DWI (2.65 ± 0.68) at b = 0 s/mm2 (full FOV DWI, 2.41 ± 0.63) (p < 0.001). On quantitative analysis, there were no significant differences between the 2 DWI sequences in ADCs of various pancreatic lesions and parenchyma (p > 0.05). ADCs of adenocarcinomas (1.061 × 10-3 mm2/s ± 0.133 at reduced FOV and 1.079 × 10-3 mm2/s ± 0.135 at full FOV) and neuroendocrine tumors (0.983 × 10-3 mm2/s ± 0.152 at reduced FOV and 1.004 × 10-3 mm2/s ± 0.153 at full FOV) were significantly lower than those of parenchyma (1.191 × 10-3 mm2/s ± 0.125 at reduced FOV and 1.218 × 10-3 mm2/s ± 0.103 at full FOV) (p < 0.05).ConclusionReduced FOV DWI of the pancreas provides better overall IQ including better anatomic detail, lesion conspicuity and subjective clinical utility. 相似文献
73.
74.
75.
76.
Inami N Sato H Makiyama K Song K Murayama I Takayama T 《Hepato-gastroenterology》2004,51(60):1717-1721
BACKGROUND/AIMS: Quality of life can be adversely affected in many patients who suffer phonation disorders such as hoarseness and dysphonia following esophagectomy. The present study investigated postoperative phonation disorders in 15 patients who underwent esophagectomy for esophageal cancer. METHODOLOGY: None of the patients had signs of hoarseness before or after surgery. Aerodynamic testing to assess phonatory function testing and laryngoscopy for observing laryngeal movements were performed before and after surgery. As a control, the same tests were conducted in 20 patients treated for gastric cancer by gastrectomy. RESULTS: For esophagectomy patients, mean postoperative flow rate was significantly increased and maximum postoperative phonation time was significantly decreased after operation. Laryngoscopy confirmed postoperative paralysis of left laryngeal movements and excessive adduction of the right, unaffected vocal cord during phonation in 8 of 15 esophagectomy patients, although hoarseness was not reported by any patient. No significant changes were observed for mean postoperative flow rate or maximum postoperative phonation time following surgery in gastrectomy patients. CONCLUSIONS: Surgical procedures in the vicinity of the recurrent laryngeal nerve appear to be the cause of postoperative phonation disorders in patients undergoing esophagectomy for esophageal cancer, and these disorders can occur in the absence of symptoms such as hoarseness and dysphonia. 相似文献
77.
78.
Ohnishi H Abe M Hamada H Yokoyama A Hirayama T Ito R Nishimura K Higaki J 《Respirology (Carlton, Vic.)》2005,10(1):128-131
A 66-year-old man was admitted with dyspnoea. Chest X-ray and chest computed tomography (CT) demonstrated a left-sided pleural effusion and multiple tumours, suggesting malignant mesothelioma in the left pleural space, but there were no pulmonary lesions. However, abdominal CT revealed a right renal tumour. An ultrasonography-guided needle biopsy of the pleural mass provided evidence of metastatic renal cell carcinoma (RCC). The pleural lesions dramatically decreased in size following right radical nephrectomy and subsequent interferon-alpha treatment. While the thorax is a frequently affected site of RCC, sole pleural metastases are rare and are often secondary to lung involvement. Batson's plexus, a network of vertebral valve-less veins with multiple connections, is likely responsible for the contralateral pleural metastases of RCC. 相似文献
79.
Selenium deficiency in a patient with Crohn's disease receiving long-term total parenteral nutrition
Ishida T Himeno K Torigoe Y Inoue M Wakisaka O Tabuki T Ono H Honda K Mori T Seike M Yoshimatsu H Sakata T 《Internal medicine (Tokyo, Japan)》2003,42(2):154-157
We report a case of selenium deficiency in a patient with Crohn's disease on long-term total parenteral nutrition (TPN). She manifested lassitude of the legs, discoloration of the nail beds, and macrocytosis. Since her plasma selenium level was found to be below the measurable level, we diagnosed this case as selenium deficiency. After intravenous administration of sodium selenite, her symptoms were reversed. Careful attention should be paid to selenium deficiency when a patient receives long-term TPN; supplementary administration of selenium via TPN may be required because selenium is often not routinely added to TPN formulations. 相似文献
80.