首页 | 本学科首页   官方微博 | 高级检索  
文章检索
  按 检索   检索词:      
出版年份:   被引次数:   他引次数: 提示:输入*表示无穷大
  收费全文   989篇
  免费   48篇
  国内免费   3篇
儿科学   26篇
妇产科学   22篇
基础医学   151篇
口腔科学   6篇
临床医学   47篇
内科学   215篇
皮肤病学   23篇
神经病学   104篇
特种医学   38篇
外科学   187篇
预防医学   28篇
眼科学   3篇
药学   16篇
肿瘤学   174篇
  2023年   10篇
  2022年   12篇
  2021年   29篇
  2020年   19篇
  2019年   14篇
  2018年   35篇
  2017年   28篇
  2016年   25篇
  2015年   13篇
  2014年   30篇
  2013年   32篇
  2012年   65篇
  2011年   67篇
  2010年   41篇
  2009年   24篇
  2008年   45篇
  2007年   52篇
  2006年   53篇
  2005年   50篇
  2004年   52篇
  2003年   50篇
  2002年   57篇
  2001年   17篇
  2000年   13篇
  1999年   13篇
  1998年   10篇
  1997年   10篇
  1996年   16篇
  1995年   4篇
  1994年   4篇
  1993年   4篇
  1992年   12篇
  1991年   8篇
  1990年   10篇
  1989年   11篇
  1988年   24篇
  1987年   15篇
  1986年   5篇
  1985年   9篇
  1984年   11篇
  1983年   7篇
  1981年   4篇
  1980年   8篇
  1979年   4篇
  1978年   4篇
  1977年   3篇
  1973年   2篇
  1972年   3篇
  1970年   1篇
  1969年   1篇
排序方式: 共有1040条查询结果,搜索用时 15 毫秒
991.
992.
T Sarai  T Sasaki  K Kojima  M Motoi 《Ryūmachi》1991,31(3):304-8; discussion 308-10
A case of a 62-year-old female with Sj?gren's syndrome (SjS) who developed a malignant lymphoma (ML) is reported. The patient who became blind at 32 years of age due to retinitis, began to complain of sicca syndrome (dry eye and dry mouth) and polyarthralgia at 40 years of age. A rapidly progressive subcutaneous mass was noted in the right anterior chest wall at 62 years of age. The surgically resected mass was diagnosed histologically as ML, diffuse, large cell type. Immunohistological study was done. Almost all of the lymphocytes infiltrated around ductules of a small salivary gland biopsied 6 years earlier were B-cells (MB-1; +, Mx-Pan B; +, IgG k; +). Only a small number of them were evaluated as T-cells (UCHL-1; +). The ML tumor was studied as a B-cell lymphoma which did not produce immunoglobulins (MB-1; +, Mx-Pan B; +). The patient was treated with a CHOP-B protocol and radiation without exacerbation. In recent reports of this association, helper T-cells were dominant in the lymphocytes infiltrated in the salivary gland in the early stage when ML did not develop yet. In this case, B-cells were dominant in the small salivary gland in contrast to the former reports. It is interesting that there was a difference in the character of the infiltrating lymphocytes.  相似文献   
993.
The transformation frequency of mouse BALB/3T3 cells was significantly enhanced after transfection with an activated ras oncogene (v-Ha- ras ) followed by treatment with a tumor promoter, 12-O-tetradecanoyl-phorbol-13-acetate (TPA), suggesting that the ras oncogene acted as an initiator in two-stage carcinogenesis. A cell clone (Bhas42) containing the ras oncogene was isolated from the ras -transfected BALB/3T3 cells. Bhas42 cells were flat and showed contact inhibition, but the addition of TPA to quiescent Bhas42 cultures resulted in a dramatic change of cell morphology to spindle shape, doubling of the cell population, and increased DNA synthesis.  相似文献   
994.
K Hamaya  K Doi  S Yoshizawa  M Motoi 《Gan no rinsho》1988,34(14):1956-1960
An immuno-histological study of metastatic adenocarcinoma has revealed the following results. Metastatic adenocarcinomas of the lymph-node of pulmonary and colonic origin were positive for CEA and negative for lysozymes, and those from gastric, pancreatic, and gallbladder tumors were positive CEA and lysozymes, and those from gastric and pancreatic tumors were positive for the secretory component. The prostate specific antigen was exclusively positive for metastatic prostatic adenocarcinoma with a low frequency and prostate acid phosphatase had many false positive results. Thyroglobulin was found to be positive only to colloid. Lactalbumin showed no specificity to metastatic breast adenocarcinoma. For achieving the final diagnosis of a primary tumor, its location in lymph nodes, the clinical history and the results of other examinations must also be taken into consideration.  相似文献   
995.
Familial juvenile polyposis of the stomach.   总被引:3,自引:0,他引:3  
Innumerable polyps of the stomach were recognized in a 13-yr old girl. She had no extragastric polyps on roentgenographic and endoscopic studies. Her elder brother received a subtotal gastrectomy because of gastric polyposis at 14 yr of age. Their mother died of gastric cancer at 37 yr of age. Only these three subjects in this family had unusual brown hair and were low in normal intelligence. Polyps produced chronic and severe loss of both blood and protein, which resolved after a subtotal gastrectomy at 18 yr of age. Macroscopic and histologic observations of polyps in the resected stomach confirmed the diagnosis of juvenile polyposis. Both siblings are now in good health. Classification of this hereditary syndrome as a newly recognized entity, familial juvenile polyposis of the stomach, is proposed.  相似文献   
996.
Surgical specimens from 60 Japanese women with breast cancer were studied histochemically to detect estrogen receptors (ER). Forty-six were analyzed in a double blind study designed to compare the histochemical method using fluorescent estradiol conjugate for detection of ER (FITC method) with findings in case of the currently employed dextran coated charcoal (DCC method) techniques. The ER test was positive in 39 (65 percent) of the 60 cases studied by FITC method. Of the 46 cases analysed in a double blind study, 41 (89.8 percent) showed the same results. Of the 5 with inconsistent test results, 2 showed positive DCC and negative FITC, and 3, negative DCC and positive FITC. According to the histologic type, the FITC method demonstrated a low positive ER response rate in scirrhous cases (57 per cent), whereas the positive rate was 67 percent among papillotubular-type cases and 65 percent among medullary tubullar-type cases. In relation to menstrual status, the positive rates were 68 percent and 64 percent among premenopausal and postmenopausal women, respectively. However, in relation to tumor size, no difference was noted in the positive response rate by either method. Therefore, both the DCC and FITC methods are clinically useful to determine the indications for hormone therapy. Presented at the 83rd Annual Meeting of Japanese Surgical Society, Osaka City, April 5–7, 1983  相似文献   
997.
Human adenovirus type 31 was inoculated intraperitoneally into 18 and intracranially into 98 Syrian hamsters within 24 hours of birth. Intra-peritoneal tumors developed multicentrically in 94.4%, 93 days on an average after virus inoculation, while brain tumors developed in 6.1%, 154 days. Intraperitoneal tumors primarily developed in the subserosal tissues and protruded into the peritoneal cavity. Some of five enlarged brain tumors seemed to have extended from the paraventricular regions to the neighboring structures, and one microtumor was located in the subependymal layer. Twenty-six of the 98 hamsters inoculated with virus intracranially unexpectedly developed tumors in the subcutaneous tissue of the skull. Histological, immunohistochemical and electron micrscopic studies revealed that the tumors which developed in the different sites had essentially the same features and were composed of undifferentiated small cells of primitive neuroectodermal nature. The incidence and the characteristics of the tumors were discussed in comparison with those of adenovirus type 12-induced tumors described previously. ACTA PATHOL. JPN. 34: 1313–1326, 1984.  相似文献   
998.
In order to explore the question if dopamine β-hydroxylase inhibitor alone has a disulfiram-like effect on alcohol, fusaric acid, a potent inhibitor of dopamine β-hydroxylase, was administered to 23 gamma alcoholics. The alcohol-test was made twice, prior to administration of fusaric acid and after one week of the treatment. Significant effects of the agent on reaction to alcohol were observed in the symptom of flushing of face, a fall in blood pressure, change of the taste, and feeling of getting drunk. These symptoms were more slight than those of the alcohol-disulfiram reaction. However, it was emphasized that the mechanism of the alcohol-disulfiram reaction is not explained by only a transient hyperacetaldehydemia, but may be also related to the metabolism of both catecholamines and serotonin. Further clinical studies are needed to assess therapeutic use of te compound in the treatment of chronic alcoholism. The fusaric acid was supplied from Banyu Pharmaceutical Co. Ltd. with a favor of Professor Hamao Umezawa, Director of Institute of Biseibutsu Kagaku to meet with the request of one of the authors, Motoi Ogata, M.D.  相似文献   
999.

Background  

YM529 is a newly developed nitrogen-containing bisphosphonate (BP) classified as a third-generation BP that shows a 100-fold greater potency against bone resorption than pamidronate, a second-generation BP. This agent is, therefore expected to be extremely useful clinically for the treatment of osteoporosis and hypercalcemia. Recently, YM529 as well as other third-generation BPs have also been shown to exert anti-tumor effects against various types of cancer cells both in vitro or/and in vivo. In this study, we investigate the anti-tumor effect of YM529 on non-small cell lung cancer (NSCLC).  相似文献   
1000.
We report herein the case of a 32-year-old woman found to have a venous aneurysm originating from the ovarian vein. The patient presented with a 9-cm abdominal tumor, and surgery was performed under the preoperative diagnosis of a mesenteric cyst. The tumor was easily ablated from the mesentery and resected with the right ovarian artery and vein. His-tologically, the wall of the cyst showed the structure of a vein, and the diagnosis of a venous aneurysm was made. This disease is difficult to diagnose preoperatively when a patient presents with no symptoms other than a palpable mass, or when the lumen is obstructed by thrombus. This report serves to demonstrate that a venous aneurysm should be considered in the differential diagnosis of an asymptomatic abdominal mass. Received: December 20, 1999 / Accepted: November 20, 2000  相似文献   
设为首页 | 免责声明 | 关于勤云 | 加入收藏

Copyright©北京勤云科技发展有限公司  京ICP备09084417号