全文获取类型
收费全文 | 748篇 |
免费 | 0篇 |
国内免费 | 1篇 |
专业分类
化学工业 | 6篇 |
金属工艺 | 1篇 |
建筑科学 | 1篇 |
矿业工程 | 1篇 |
轻工业 | 11篇 |
无线电 | 10篇 |
一般工业技术 | 5篇 |
冶金工业 | 713篇 |
自动化技术 | 1篇 |
出版年
2015年 | 1篇 |
2013年 | 1篇 |
2009年 | 1篇 |
2008年 | 1篇 |
2007年 | 1篇 |
2005年 | 1篇 |
2003年 | 6篇 |
2002年 | 2篇 |
2001年 | 2篇 |
2000年 | 5篇 |
1999年 | 19篇 |
1998年 | 186篇 |
1997年 | 113篇 |
1996年 | 62篇 |
1995年 | 43篇 |
1994年 | 44篇 |
1993年 | 52篇 |
1992年 | 10篇 |
1991年 | 16篇 |
1990年 | 16篇 |
1989年 | 22篇 |
1988年 | 13篇 |
1987年 | 10篇 |
1986年 | 12篇 |
1985年 | 11篇 |
1983年 | 3篇 |
1982年 | 5篇 |
1981年 | 3篇 |
1980年 | 4篇 |
1979年 | 2篇 |
1978年 | 1篇 |
1977年 | 21篇 |
1976年 | 53篇 |
1974年 | 3篇 |
1966年 | 1篇 |
1955年 | 1篇 |
1926年 | 2篇 |
排序方式: 共有749条查询结果,搜索用时 9 毫秒
121.
122.
AN Williams RG Gray K Poulton P Ramani WP Whitehouse 《Canadian Metallurgical Quarterly》1998,40(8):568-570
Ohtahara syndrome is a rare cause of epileptic seizures during the neonatal period. This is believed to be the first report of this syndrome with a specific metabolic defect. Defects in respiratory chain function may be more common than previously assumed in patients with this epilepsy syndrome. 相似文献
123.
Extensive evidence from both in vivo and in vitro experiments indicate that IL-1, a prototypic proinflammatory cytokine, is involved in the mechanisms that lead to progressive joint destruction in RA. IL-1Ra, a member of the IL-1 family, binds IL-1 receptors but does not induce any cellular responses. IL-1Ra competitively inhibits the binding of IL-1 to its cell surface receptors and thus, acts as an endogenous antiinflammatory mediator. However, the results of several studies suggest that a relatively deficient production in IL-1Ra as compared to that of IL-1 in RA synovium may predispose to the perpetuation of chronic inflammation. Systemic administration of IL-1Ra, or local delivery into the joint by gene therapy, in different experimental animal models of arthritis attenuated the severity of the inflammatory response and reduced articular destruction. In addition, treatment of rheumatoid patients with IL-1Ra led to an improvement in different clinical and biological parameters and to a reduction in the radiological signs of joint erosions. Encouraging results also have been reported in both in vitro and in vivo experimental animal models of arthritis through using other strategies designed to block the effects of IL-1 at the level of production, prevent the binding of IL-1 to its cell surface receptors, or interfere with the effects of IL-1 at the post-receptor level. 相似文献
124.
J Vredenburgh R Fishman D Coniglio L Matters M Elkordy M Ross A Hussein P Rubin C Gilbert W Petros WP Peters 《Canadian Metallurgical Quarterly》1998,21(6):543-547
We investigated tissue staining for Bcl-2 and Bax proteins, which regulate apoptosis, as indicators of chemotherapeutic effect in patients with gastric cancer. In 23 patients with gastric carcinoma biopsy specimens were obtained endoscopically prior to chemotherapy and stained immunohistochemically with anti-Bcl-2 and anti-Bax antibodies. Patients then were treated with continuous infusion of 5-FU and cisplatin. No correlation was seen between chemotherapeutic effect and Bcl-2 or Bax alone. However, among the Bax-positive cases, the patients with Bcl-2-positive tumors were significantly more chemoresistant (p = 0.036) and had worse prognoses (p = 0.008) than Bcl-2-negative cases. Therefore, immunohistochemical staining for Bcl-2 protein may predict chemotherapeutic efficacy or guide specific therapeutic choices in treating Bax-positive tumors. 相似文献
125.
126.
WP Maier GP Rosemond LI Goldman GF Kaplan RR Tyson 《Canadian Metallurgical Quarterly》1977,144(5):695-698
In this large series of patients treated for medullary carcinoma of the breast by radical mastectomy, the over-all five year survival rate was 63.7 per cent and the ten year survival rate, 49.5 per cent. Although survival was adversely affected by axillary lymph node involvement, there was an equal incidence of such involvement, there was an equal incidence of such involvement in tumors less than 4 centimeters compared with those greater than 4 centimeters in size; however, patients with tumors greater than 4 centimeters in size fared poorer categorically than did those with smaller lesions. Women in the premenopausal period had one-third of the cancers and had a significantly better survival rate than did those in the postmenopausal period, despite a similar incidence of axillary lymph node involvement. Medullary carcinoma is among the small group of malignant tumors of the breast that have distinctly better five and ten year survival rates than other more common varieties. 相似文献
127.
128.
JA Lamphere PO Daily RJ Moreno S Marcus WP Dembitsky RM Adamson M Burr P O'Neill 《Canadian Metallurgical Quarterly》1995,60(6):1829-1830
A new technique using the Thompson self-retaining retractor system (Thompson Surgical Instruments, Inc, Traverse City, MI) to harvest lesser saphenous veins is presented. This modification, used in 10 patients undergoing redo myocardial revascularization, provided a rapid, comfortable, and convenient method for harvesting lesser saphenous veins. 相似文献
129.
Malignant acrospiroma is an uncommon tumor of the eccrine sweat gland. In contrast to its relatively more common benign counterpart, malignant acrospiroma is highly invasive, often with significant lymphatic and distant metastasis. The establishment of this diagnosis is difficult on both clinical and histopathologic grounds. After diagnosis, wide surgical excision is warranted to completely extirpate these lesions. We report the case of a 66-year-old female with a recurrent malignant acrospiroma. This patient's tumor was removed by wide radical resection, including chest wall excision, followed by reconstructive surgery and radiotherapy. After 16 months there is no evidence of local recurrence or distant metastasis. 相似文献
130.
Fetal rats exhibit oral grasping of an artificial nipple. The authors examined interactive effects of sensory stimuli normally encountered in the suckling environment on subsequent responses to the nipple. Embryonic Day 20 rat fetuses received an infusion of milk, lemon, or saline through a hollow artificial nipple or an intraoral cannula (producing no nipple stimulation). One minute after sensory pretreatment, behavioral responses of fetuses to an artificial nipple were recorded on videotape for frame-by-frame analysis. Preexposure to the artificial nipple decreased the number of oral grasps and facial wipes directed toward the artificial nipple but increased the duration of grasp responses. Milk uniformly reduced fetal responsiveness to the nipple. Furthermore, the artificial nipple enhanced fetal responses to perioral cutaneous stimulation, whereas milk suppressed perioral responsiveness. These data suggest that the perinatal rat's 1st experience with milk or the nipple can alter subsequent responses to suckling stimuli. 相似文献