全文获取类型
收费全文 | 16163篇 |
免费 | 731篇 |
国内免费 | 82篇 |
专业分类
耳鼻咽喉 | 189篇 |
儿科学 | 273篇 |
妇产科学 | 181篇 |
基础医学 | 2093篇 |
口腔科学 | 343篇 |
临床医学 | 1058篇 |
内科学 | 4659篇 |
皮肤病学 | 302篇 |
神经病学 | 1035篇 |
特种医学 | 554篇 |
外科学 | 2374篇 |
综合类 | 66篇 |
一般理论 | 1篇 |
预防医学 | 334篇 |
眼科学 | 220篇 |
药学 | 1226篇 |
中国医学 | 24篇 |
肿瘤学 | 2044篇 |
出版年
2023年 | 103篇 |
2022年 | 249篇 |
2021年 | 403篇 |
2020年 | 204篇 |
2019年 | 270篇 |
2018年 | 321篇 |
2017年 | 249篇 |
2016年 | 320篇 |
2015年 | 343篇 |
2014年 | 415篇 |
2013年 | 532篇 |
2012年 | 952篇 |
2011年 | 1057篇 |
2010年 | 607篇 |
2009年 | 466篇 |
2008年 | 886篇 |
2007年 | 948篇 |
2006年 | 897篇 |
2005年 | 871篇 |
2004年 | 880篇 |
2003年 | 855篇 |
2002年 | 851篇 |
2001年 | 404篇 |
2000年 | 449篇 |
1999年 | 350篇 |
1998年 | 185篇 |
1997年 | 128篇 |
1996年 | 99篇 |
1995年 | 112篇 |
1994年 | 93篇 |
1993年 | 95篇 |
1992年 | 211篇 |
1991年 | 200篇 |
1990年 | 171篇 |
1989年 | 198篇 |
1988年 | 158篇 |
1987年 | 145篇 |
1986年 | 155篇 |
1985年 | 160篇 |
1984年 | 110篇 |
1983年 | 111篇 |
1982年 | 48篇 |
1981年 | 50篇 |
1980年 | 43篇 |
1979年 | 82篇 |
1978年 | 54篇 |
1977年 | 50篇 |
1975年 | 46篇 |
1970年 | 45篇 |
1967年 | 44篇 |
排序方式: 共有10000条查询结果,搜索用时 12 毫秒
1.
2.
3.
4.
Marie Ohata Susumu Fujiwara Ai Yoshioka Hiroshi Nagai Shintaro Sugita Nozomi Yamano Yusuke Inoue Chikako Nishigori 《Pediatric dermatology》2019,36(6):997-998
Fibroblastic connective tissue nevus (FCTN) is a benign cutaneous mesenchymal lesion characterized by proliferation of CD34‐positive fibroblastic/myofibroblastic spindle‐shaped cells. We report a case of agminated FCTN on the right lower abdomen of a 1‐year‐old boy. 相似文献
5.
Yamaoka Mai Yoshida Mahoko Nakashima Ayumu Doi Shigehiro Naito Takayuki Masaki Takao 《Clinical and experimental nephrology》2022,26(11):1111-1118
Clinical and Experimental Nephrology - The association between N-terminal pro-brain natriuretic peptide (NT-proBNP) and stroke in Japanese hemodialysis (HD) outpatients is unclear. Therefore, in... 相似文献
6.
Katsuo Kamata Ayako Makino Noriyasu Kanie Shu-ichi Oda Takayuki Matsumoto Tsuneo Kobayashi Toyohiko Kikuchi Masato Nishimura Toshio Honda 《Journal of Smooth Muscle Research》2006,42(2-3):75-88
Anthocyanins, which are responsible for a variety of bright colors (including red, blue, and purple) in fruits, vegetables, and flowers, are consumed as dietary polyphenols. Anthocyanin-containing fruits are thought to decrease coronary heart disease and are used in anti-diabetic preparations. Diabetes is associated with a variety of cardiovascular complications that may be mediated by endothelial dysfunction, and so this study was designed mainly to characterize the influence of a synthesized anthocyanidin derivative (HK-008) over acetylcholine (ACh)-induced relaxation in mesenteric arterial beds isolated from rats. In a glucose-tolerance test in intact rats, HK-008 (30 mg/kg) reduced the glucose level as effectively as the same dose of glibenclamide. The aortic relaxation induced by pinacidil (an ATP-sensitive potassium channel opener) was greatly inhibited by glibenclamide (10 microM), and also significantly inhibited by HK-008 (10 microM). Interestingly, the ACh-induced relaxation in the perfused, preconstricted mesenteric arterial bed was significantly enhanced by HK-008 (10 microM), and this enhancement was significantly attenuated by indomethacin (10 microM). The ACh-induced mesenteric relaxation was impaired by an increase in oxidative stress, viz. superoxide-generating treatment [xanthine oxidase (XO; 0.1 U/ml) plus hypoxanthine (HX; 10 microM)]. However, this impairment was strongly suppressed by HK-008 (10 microM). These results suggest that HK-008 increases endothelium-induced relaxation by suppressing oxidative stress or modulating prostanoids signaling. This compound may therefore be useful against certain cardiovascular disorders. 相似文献
7.
Intraventricular hemorrhage (IVH) in preterm infants is well known to be associated with the high morbidity and mortality of this group. Previous studies have suggested altered cerebral blood flow (CBF) as an important pathologic factor. We measured the CBF in nearterm rabbit fetuses using the hydrogen clearance technique. The local CBF of the rabbit fetuses was significantly low compared with that of the maternal rabbits. The response of CBF to changes in PaCO2 was observed in rabbit fetuses. The CO2 reactivity index of the fetal rabbit was lower than that of the maternal rabbit. This low CO2 reactivity might reflect the immaturity of the fetal brain and its low CBF. We were unable to monitor the fetal blood pressure, but the fetal CBF remained stable when the maternal blood pressure was altered. It is well known that IVH in preterm infants originates from the subependymal germinal matrix and that this has many fragile vessels. Our observation suggests that even a small increase of CBF during hypercapnia might have a large effect towards producing hemorrhage. 相似文献
8.
Takayuki Takeichi Hideaki Okajima Hiroko Suda Shintarou Hayashida Hironori Iwasaki Manuel Zeledon Ramirez Mikako Ueno Katsuhiro Asonuma Yukihiro Inomata 《Liver transplantation》2005,11(10):1285-1288
Congenital absence of the portal vein (CAPV) is a rare malformation of the splanchnic venous system. Although CAPV is usually detected in the pediatric age group, our patient was a 35-year-old woman. She had been diagnosed with CAPV in 1996 when she was 27 years old. In 1998, she was placed on hemodialysis due to chronic renal failure. After several episodes of encephalopathy in 2002, liver transplantation (LT) was recommended to her and her family. Since there was no suitable living donor candidate, she was put on the waiting list for a deceased donor liver transplant in Japan. In 2004, her ammonia level increased to around 300 microg/dl, and she went into a coma lasting for three days. After recovering from this event, she underwent a living domino transplantation using a whole liver donated by a familial amyloid polyneuropathy (FAP) patient. Her portal vein, which had drained directly into the inferior vena cava (IVC), was transected together with a cuff of the IVC wall and anastomosed to the graft liver portal vein in an end-to-end fashion. In conclusion, liver transplantation proved to be a safe and effective way to save this patient and improve her quality of life. 相似文献
9.
Shiroh Miura Takashi Kurita Kazuhito Noda Mitsuyoshi Ayabe Hisamichi Aizawa Takayuki Taniwaki 《Journal of clinical neuroscience》2009,16(4):589-590
We describe a 53-year-old man with herpes simplex virus (HSV) brainstem encephalitis diagnosed based by positive HSV immunoglobulin M antibodies from cerebrospinal fluid. The MRI findings of this case had three unique features. First, the lesions were symmetrical. Second, the lesions may have been associated with reactivation of HSV infection in the region of the trigeminal nerve. Third, diffusion-weighted and apparent diffusion coefficient (ADC) imaging, conducted for the first time on an HSV brainstem encephalitis case, suggested that the lesions were associated with vasogenic edema. 相似文献