全文获取类型
收费全文 | 28662篇 |
免费 | 1460篇 |
国内免费 | 194篇 |
专业分类
耳鼻咽喉 | 224篇 |
儿科学 | 398篇 |
妇产科学 | 376篇 |
基础医学 | 3477篇 |
口腔科学 | 682篇 |
临床医学 | 2014篇 |
内科学 | 7392篇 |
皮肤病学 | 516篇 |
神经病学 | 1916篇 |
特种医学 | 997篇 |
外科学 | 5586篇 |
综合类 | 115篇 |
预防医学 | 768篇 |
眼科学 | 362篇 |
药学 | 1768篇 |
中国医学 | 48篇 |
肿瘤学 | 3677篇 |
出版年
2023年 | 207篇 |
2022年 | 396篇 |
2021年 | 671篇 |
2020年 | 380篇 |
2019年 | 513篇 |
2018年 | 596篇 |
2017年 | 514篇 |
2016年 | 594篇 |
2015年 | 643篇 |
2014年 | 827篇 |
2013年 | 969篇 |
2012年 | 1498篇 |
2011年 | 1625篇 |
2010年 | 923篇 |
2009年 | 782篇 |
2008年 | 1411篇 |
2007年 | 1508篇 |
2006年 | 1536篇 |
2005年 | 1520篇 |
2004年 | 1518篇 |
2003年 | 1440篇 |
2002年 | 1384篇 |
2001年 | 741篇 |
2000年 | 792篇 |
1999年 | 721篇 |
1998年 | 386篇 |
1997年 | 301篇 |
1996年 | 259篇 |
1995年 | 223篇 |
1994年 | 188篇 |
1993年 | 210篇 |
1992年 | 565篇 |
1991年 | 521篇 |
1990年 | 488篇 |
1989年 | 463篇 |
1988年 | 379篇 |
1987年 | 332篇 |
1986年 | 319篇 |
1985年 | 276篇 |
1984年 | 194篇 |
1983年 | 169篇 |
1982年 | 75篇 |
1979年 | 142篇 |
1978年 | 110篇 |
1977年 | 91篇 |
1975年 | 71篇 |
1974年 | 89篇 |
1973年 | 76篇 |
1972年 | 84篇 |
1971年 | 74篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
1.
2.
3.
Kota Sahara Rin Yamada Takashi Fujiwara Koichi Koizumi Shin‐ichiro Horiguchi Tsunekazu Hishima Tatsuro Yamaguchi 《Digestive endoscopy》2015,27(7):768-771
Idiopathic myointimal hyperplasia of mesenteric veins (IMHMV) is a rare and poorly understood ischemic colitis that occurs in the rectosigmoid colon of predominantly young, previously healthy, male patients. A 76‐year‐old Japanese man presented to our hospital with a 1‐year history of worsening diarrhea, lower abdominal pain, and weight loss (−6 kg). Laboratory evaluation revealed white blood cell count of 13 200/μL, C‐reactive protein level of 2.0 mg/dL (normal range, 0.0–0.3), and negative results for stool culture (including Clostridium difficile). Colonoscopy showed circumferential and edematous narrowing of the sigmoid colon with deep longitude ulceration. Biopsy was done and examination of the specimen demonstrated no specific ischemia. The patient was treated with bowel rest, antibiotics, and i.v. fluids; however, his symptoms worsened. Finally, sigmoidectomy was carried out. Histological examination demonstrated significant myointimal hyperplasia of mesenteric veins leading to thickening and stenosis of the venous lumen. Therefore, the final diagnosis was IMHMV. Three months following sigmoidectomy, he was asymptomatic. 相似文献
4.
5.
Intraductal papillary mucinous tumor (IPMT) of the pancreas is characterized by slow growth and a relatively favorable prognosis, however, invasive cancer originating in an IPMT is associated with a poor prognosis. Although various parameters in imaging modalities have been advocated to differentiate between benign IPMN and malignant ones, it is not easy to obtain definite diagnosis based on these parameters. Peroral pancreatoscopy (POPS) allows a clear and direct visualization of the pancreatic duct, providing useful information regarding tumor nature in IPMT. The authors have studied the usefulness of POPS in the diagnosis of IPMT. Nevertheless, its usefulness is not necessarily widely accepted and the significance of POPS is still controversial. In this review, the authors intended to address the diagnostic value of POPS and to clarify its role in the diagnosis of IPMT. The authors think treatment of IPMT can be improved by introducing POPS because the determination of surgical procedure as well as the area of resection based on the preoperative diagnosis of the involvement of the main pancreatic duct and branch duct is inevitable. 相似文献
6.
Koji Saito Takashi Saito Sumio Kawada 《Nihon Shokakibyo Gakkai zasshi》2006,103(10):1176, 1179-1176, 1180
7.
8.
Mamoru Uemura MD Masahiko Higashiyama MD Jiro Okami MD Kazuyuki Oda MD Koji Takami MD Ken Kodama MD 《General thoracic and cardiovascular surgery》2006,54(2):289-292
We present a case of intrapulmonary metastasis developing 18 years after complete resection of thymoma. An 8 mm nodule in the lower lobe of the left lung was noted on chest X-ray in a 76-year-old woman who had undergone complete resection of Masaoka’s stage II thymoma 18 years earlier. Since the nodule grew to 17 mm during a 2-year follow-up, wedge resection was performed. The lesion was histologically diagnosed as an intrapulmonary metastasis from thymoma. Extremely late recurrence after complete resection of thymoma is discussed. 相似文献
9.
Nobuaki Yanagisawa Shinichi Abe Hiroko Agematsu Koji Sakiyama Akinobu Usami Yuichi Tamatsu Yoshinobu Ide 《Annals of anatomy》2006,188(4):329-336
To elucidate the effects of teeth on muscle fibers in the tongue during the developmental process, we examined the expression of muscle contractile proteins and the genes for those proteins in normal mice and microphthalmic (mi/mi) mice with impaired tooth eruption. The mice were observed during the growth period, including weaning, which is when feeding movements undergo major changes. Expression of the myosin heavy chain (MyHC)-2a protein, whose contraction speed is relatively slow, disappeared after weaning in normal mice, while it remained in high concentrations even after weaning in mi/mi mice. The presence of MyHC-2a after weaning in mice with no tooth eruption was attributed to a compensation for lack of proper masticatory function and sucking-like movements, as MyHC-2a is necessary for these movements. 相似文献
10.
Toru Yamaguchi Ippei Kanazawa Masahiro Yamamoto Soichi Kurioka Mika Yamauchi Shozo Yano Toshitsugu Sugimoto 《BONE》2009,44(2):174-179
The association of bone with the metabolic syndrome and its features, visceral fat accumulation or insulin resistance, remains unclear. We determined visceral and subcutaneous fat areas (V and S) by computed tomography on 187 men (28–83 years) and 125 postmenopausal women (46–82 years) with type 2 diabetes. Men whose V was 100 cm2 or more had significantly lower urinary N-terminal cross-linked telopeptide of type-I collagen (p = 0.005), higher femoral neck bone mineral density (FN-BMD) (p = 0.004), and lower prevalence of vertebral fractures (VFs) (p = 0.04) than controls. Fat mass, V, S, and lean body mass positively correlated with FN-BMD in men and with lumbar (L) and FN-BMD in women. When adjusted for weight, these correlations became negative. Urinary C-peptide positively correlated with FN-BMD in both genders. Multivariate logistic regression analysis adjusted for age, height, weight, L-BMD, duration of diabetes, and diabetes therapies identified V in men and urinary C-peptide in women as factors inversely associated with the presence of VFs [odds ratio (OR) = 0.61 per SD increase, p = 0.04, and OR = 0.32, p = 0.01, respectively]. These findings suggest that, of the components of the metabolic syndrome, body fat in gravity and hyperinsulinemia could increase FN-BMD in diabetic subjects. Visceral fat in men and hyperinsulinemia in women may protect against VFs independent of weight, L-BMD, diabetes duration, or therapies. 相似文献