全文获取类型
收费全文 | 2969篇 |
免费 | 134篇 |
国内免费 | 18篇 |
专业分类
耳鼻咽喉 | 16篇 |
儿科学 | 90篇 |
妇产科学 | 12篇 |
基础医学 | 375篇 |
口腔科学 | 100篇 |
临床医学 | 124篇 |
内科学 | 538篇 |
皮肤病学 | 42篇 |
神经病学 | 239篇 |
特种医学 | 98篇 |
外科学 | 719篇 |
综合类 | 28篇 |
预防医学 | 60篇 |
眼科学 | 34篇 |
药学 | 207篇 |
中国医学 | 9篇 |
肿瘤学 | 430篇 |
出版年
2023年 | 9篇 |
2022年 | 46篇 |
2021年 | 63篇 |
2020年 | 42篇 |
2019年 | 33篇 |
2018年 | 57篇 |
2017年 | 31篇 |
2016年 | 44篇 |
2015年 | 53篇 |
2014年 | 67篇 |
2013年 | 80篇 |
2012年 | 160篇 |
2011年 | 170篇 |
2010年 | 83篇 |
2009年 | 95篇 |
2008年 | 120篇 |
2007年 | 134篇 |
2006年 | 133篇 |
2005年 | 152篇 |
2004年 | 130篇 |
2003年 | 116篇 |
2002年 | 136篇 |
2001年 | 105篇 |
2000年 | 94篇 |
1999年 | 105篇 |
1998年 | 43篇 |
1997年 | 40篇 |
1996年 | 28篇 |
1995年 | 17篇 |
1994年 | 24篇 |
1993年 | 19篇 |
1992年 | 60篇 |
1991年 | 79篇 |
1990年 | 62篇 |
1989年 | 78篇 |
1988年 | 69篇 |
1987年 | 44篇 |
1986年 | 40篇 |
1985年 | 39篇 |
1984年 | 27篇 |
1983年 | 25篇 |
1982年 | 16篇 |
1981年 | 7篇 |
1980年 | 14篇 |
1979年 | 28篇 |
1978年 | 17篇 |
1977年 | 15篇 |
1974年 | 9篇 |
1972年 | 10篇 |
1971年 | 8篇 |
排序方式: 共有3121条查询结果,搜索用时 15 毫秒
1.
A Kubota A Okada K Imura H Kawahara R Nezu S Kamata Y Takagi 《Journal of pediatric surgery》1990,25(6):618-621
The effect of metronidazole (MNZ) on hepatic dysfunction associated with total parenteral nutrition (TPN) in neonates was investigated. Neonates receiving TPN for more than 2 weeks were divided into three groups. In group 1, TPN was given alone, in group 2, 25 mg/kg/d of MNZ was administered intravenously for the first 2 weeks of TPN, and in group 3, 50 mg/kg/d of MNZ was given for the first 3 weeks of TPN. Several parameters of liver function tests (LFTs) during the first 4 weeks of TPN were compared among these three groups. There was no significant difference of these parameters between group 1 and group 2. Although there was no significant difference of alkaline phosphatase, gamma-glutamyl transpeptidase, direct bilirubin, and total bile acid between groups 1 and 3, transaminase (glutamic oxaloacetic, glutamic pyruvic) of group 3 remained significantly lower than those of group 1. In conclusion, the administration of MNZ 50 mg/kg/d for 3 weeks, at least, prevented the elevation of transaminase during TPN in neonates, suggesting the possible involvement of intestinal anaerobic flora in the pathogenesis of TPN-associated liver dysfunction. 相似文献
2.
Mitsumasa Iwata Shunji Izuta Motoshi Suzuki Kiyohide Kojima Yoshihito Furuhashi Yutaka Tomoda Shonen Yoshida 《Cancer science》1991,82(4):433-439
We examined the mechanisms of the inhibition of DNA synthesis by a new platinum compound, (-)-( R )-2-aminomethylpyrrolidine(1,1-cyclobutane-dicarboxylato)-2-platinum(II) monohydrate (DWA-2114R), a derivative of the antitumor drug cis- diamminedichloroplatinum(II) (CDDP), using prokaryotic and eukaryotic DNA polymerases. Preincubating activated DNA with CDDP or DWA-2114R reduced its template activity for prokaryotic and eukaryotic DNA polymerases in a dose-dependent manner. DWA2114R required six times greater drug concentration and two times longer incubation time to show the same decrease of the template activity compared to CDDP. Treatment of primed pUC118 ssDNA templates with the two drugs followed by second-strand synthesis by prokaryotic and eukaryotic DNA polymerases revealed that DWA2114R bound to DNA in a similar manner to CDDP and these adducts blocked DNA elongation by DNA polymerases of eukaryotes as well as of prokaryotes. With these two drugs, the elongations by E. coli DNA polymerase I (Klenow fragment), T7 DNA polymerase and calf thymus DNA polymerase α were strongly arrested at guanine-guanine sequences (GG). Stop bands were also observed at adenine-guanine sequences (AG) guanine-adenine-guanine sequences (GAG) and mono-guanine sequence (G). Calf testis DNA polymerase β was also arrested efficiently at AG, GAG and G, but much more weakly at GG. This pattern was common to DWA2114R and CDDP. 相似文献
3.
Successful treatment of a patient with penetrating injury of the esophagus and brachiocephalic artery due to migration of Kirschner wires. 总被引:2,自引:0,他引:2
Shinsuke Wada Tsuyoshi Noguchi Tsuyoshi Hashimoto Yuzo Uchida Katsunobu Kawahara 《Annals of thoracic and cardiovascular surgery》2005,11(5):313-315
Pins and wires offer the simplest and most effective tools for managing bone fractures and dislocations. Migration of these devices within the chest is rare, but can cause serious problems. The spontaneous migration of Kirschner wires from the right clavicle to the mediastinum resulted in penetrating injury of the esophagus and pseudo-aneurysm of the brachiocephalic artery in an 84-year-old patient. Two Kirschner wires were removed via a vertical incision on the right shoulder without thoracotomy and the brachiocephalic artery was replaced with a Dacron graft. 相似文献
4.
Principle for video-assisted thoracic surgery. 总被引:2,自引:0,他引:2
Motoshi Takao Tomohito Tarukawa Akira Shimamoto Hideto Shimpo 《European journal of cardio-thoracic surgery》2005,28(4):657; author reply 657-657; author reply 658
5.
Neoplastic angioendotheliosis has rarely been described as a respiratory disease. A patient is described with pulmonary vascular involvement induced by neoplastic angioendotheliosis in pulmonary vessels. 相似文献
6.
K Imura A Okada Y Fukui H Kawahara M Yagi A Kubota S Kanaya S Kamata Y Nagata 《JPEN. Journal of parenteral and enteral nutrition》1988,12(5):496-504
In 97 neonates receiving total parenteral nutrition in the postoperative period, clinical assessment was made for a newly devised amino acid solution (PF-I-III) from the standpoint of plasma amino acid profile and nutritional effect. These amino acid solutions prepared are characterized by the high concentration of branched-chain amino acids up to 40%, increased arginine and decreased glycine, phenylalanine and methionine as compared with commercially available solutions. In the PF group, each amino acid was kept within the range of standard value. Correlation between plasma amino acid profiles and the dose of each amino acid administered was obtained, from which minimum, standard, and maximum doses for each amino acid was determined. Based on these values, we proposed new formula for neonates which elicits no abnormal plasma amino acid pattern even when amino acids are administered at the dosage level of 1.5-2.5 g/kg/day. 相似文献
7.
Katsunobu Kawahara Takeshi Shiraishi Kan Okabayashi Akinori Iwasaki Yasuteru Yoshinaga Kouji Hayashi Jyunichi Yamashita Takayuki Shirakusa 《Surgery today》1997,27(2):163-165
A patient with a recurrent tumor in the trachea adjacent to the right main bronchus was treated by surgical resection 19 months
after undergoing surgery for the primary cancer. The patient had previously undergone right upper lobectomy for T1N0M0 stage
I squamous cell carcinoma. A carinal resection was performed which included 4 rings of the trachea, 2 rings of the righ main
bronchus, and 1 ring of the left main bronchus. Reconstruction consisted of an end-to-end anastomosis of the trachea and left
main bronchus, and an end-to-side anastomosis of the right and left main bronchi. The postoperative course was uneventful,
and at present the patient is healthy 12 months following reoperation. 相似文献
8.
Prevention of Acute Lung Allograft Rejection in Rat by CTLA4Ig 总被引:6,自引:0,他引:6
Takeshi Shiraishi Yohichi Yasunami Megumi Takehara Toshimitsu Uede Katsunobu Kawahara Takayuki Shirakusa 《American journal of transplantation》2002,2(3):223-228
CTLA4 immunoglobulin (CTLA4Ig), which binds with a high affinity to B7-1 and B7-2, interrupts T-cell activation by inhibiting costimulatory signal. CTLA4Ig has been used in hopes of achieving antigen-specific tolerance induction in several solid organ transplants. In lung allograft rejection, however, its use has been controversial in terms of its effect on prevention of rejection. In the present study, the effect of murine CTLA4Ig on rat-lung allograft rejection was investigated. Rat left-lung transplantation was performed in an RT1 incompatible donor (Brown Norway; BN)-recipient (F344) combination. All allografts (n = 12) without any treatment were rejected within 7 days after transplantation. A single injection of murine form CTLA41g at a dose of 100 microg intraperitoneally (ip) or intravenously (iv) on day 1 post-transplantation achieved long-term graft survival (>90days) in 2/5 (40%) and 3/8 (38%), respectively. Moreover, 6/7 (86%) allografts in rats that received iv injection of 500 microg CTLA4Ig survived more than 90days. Allograft survival in the CTLA4Ig 500 microg iv recipient group was significantly longer than that in the no-treatment control or control immunoglobulin group (p <0.01). Four out of seven recipients bearing functional allografts for more than 90 days with the CTLA4Ig treatment accepted donor-specific skin grafts, whereas all third-party skin grafts (n=3) were rejected. Prevention of rat-lung allograft rejection could be achieved by intravenous administration of CTLA4Ig, resulting in long-term allograft survival with acceptance of donor-specific skin grafts. 相似文献
9.
在免眼中进行经瞳孔阈值下温热疗法的组织学效应和蛋白表达 总被引:1,自引:0,他引:1
Yoshihiro Morimura Annabelle A. Okada Atsushi Hayashi Sayuri Fujioka Sumie Kawahara Tetsuo Hida 李扬 《美国医学会眼科杂志(中文版)》2005,17(3):185-186
目的:研究阈值下经瞳孔温热疗法(TTT)对视网膜组织学的效应。方法:对正常视网膜色素的兔眼进行TTT,通过1个810nm激光二极管产生直径为1.2mm能量为50mW的光斑,持续时间为15、30和60秒。4周后进行荧光血管造影并摘除眼球,通过电子显微镜和免疫组化染色来检查。 相似文献
10.
Katsunobu Kawahara Shinji Akamine Takao Takahashi Akihiro Nakamura Hiroyuki Kusano Tohru Nakagoe Takayuki Nakazaki Hiroyoshi Ayabe Masao Tomita 《Surgery today》1994,24(12):1101-1103
We report herein the case of a 75-year-old man who developed anal canal metastasis from squamous cell carcinoma of the lung. Initially, he underwent a right middle and lower lobectomy combined with left atrial wall resection under cardiopulmonary bypass. He presented 3 months later with an anal polyp which had prolapsed and bled, for which he underwent a transanal polypectomy. Histologically, the polyp was classified as squamous cell carcinoma and considered to be a metastasis from the primary lung cancer. He is presently well with no signs of recurrence 9 months after his initial operation. To our knowledge, there has been no other case of anal metastasis from lung cancer ever reported. 相似文献