全文获取类型
收费全文 | 630篇 |
免费 | 0篇 |
专业分类
化学工业 | 1篇 |
矿业工程 | 2篇 |
轻工业 | 2篇 |
冶金工业 | 625篇 |
出版年
2021年 | 1篇 |
2020年 | 1篇 |
2013年 | 2篇 |
2012年 | 1篇 |
2003年 | 2篇 |
1999年 | 19篇 |
1998年 | 169篇 |
1997年 | 107篇 |
1996年 | 66篇 |
1995年 | 50篇 |
1994年 | 27篇 |
1993年 | 36篇 |
1992年 | 3篇 |
1991年 | 5篇 |
1990年 | 7篇 |
1989年 | 7篇 |
1988年 | 4篇 |
1987年 | 4篇 |
1986年 | 6篇 |
1985年 | 4篇 |
1982年 | 6篇 |
1981年 | 9篇 |
1980年 | 7篇 |
1978年 | 1篇 |
1977年 | 21篇 |
1976年 | 62篇 |
1975年 | 3篇 |
排序方式: 共有630条查询结果,搜索用时 2 毫秒
61.
Investigation to effect of low radiation doses in the T-cells activation surface markers expression of resident in 4 radiation zone around Chernobyl. Was observed the increase cells level, which CD4+CD25+ and CD4+HLA-DR(+)-cells markers expression. Were revealed the increase of the apoptosis related CD4+CD+ cells level in peripheral blood. 相似文献
62.
MG Beconi-Barker RD Roof L Millerioux FM Kausche TH Vidmar EB Smith JK Callahan VL Hubbard GA Smith TJ Gilbertson 《Canadian Metallurgical Quarterly》1995,673(2):231-244
2- and 4-Nitrophenyl beta-D-xylopyranosides (4 and 5) were transformed, via dibutyltin oxidemediated acylation, into the corresponding 2,3-di-O-benzoyl derivatives 11 and 15. Xylobiose and xylotriose were easily isolated by charcoal column chromatography from a commercially available material and converted into the di- and trisaccharide methyl 1-thio-beta-glycosides 36 and 37. The 2-and 4-nitrophenyl beta-glycosides of the beta-(1-->4)-D-xylo-oligosaccharides of dp 2-4 were synthesized by N-iodosuccinimide-silver triflate-promoted condensation using 11 and 15 as the glycosyl acceptors and ethyl 1-thio-beta-D-xylopyranoside triacetate 16, 36, and 37 as the glycosyl donors. Also described are an improved preparation of 4 and 5, and the synthesis of 1-naphthyl beta-D-xylopyranoside, as well as an alternative approach to the 2- and 4-nitrophenyl beta-xylobiosides. 相似文献
63.
64.
VL Koretski? 《Canadian Metallurgical Quarterly》1995,(6):45-46
Presents a model of reorganization of medical service for the urban population under novel economic conditions, which is effective from economic, medical, and social viewpoints. The model is based on the family medicine principle and provides the creation of an effective system of disease prevention, consisting in dynamic follow-up of the health status of the population in the Ukraine. 相似文献
65.
K Ogura MR Amin K Minami XD Zheng Y Suzuki WS Kim T Watanabe Y Carmel VL Granatstein 《Canadian Metallurgical Quarterly》1996,53(3):2726-2729
66.
67.
The pH and temperature dependence of the allosteric properties of phosphofructokinase (PFK) from Bacillus stearothermophilus have been studied from 5 to 9 and 6 to 40 degrees C, respectively. Throughout this pH and temperature range the allosteric ligands MgADP and phospho(enol)pyruvate (PEP) have no effect on kcat. The dissociation constants of the substrate, fructose 6-phosphate, and the allosteric ligands, as well as the absolute value of the coupling free energies between these ligands, all increase when the pH is raised, indicating that the inhibition by PEP and the activation by MgADP increase despite each ligand's somewhat lower affinity. However, the constituent coupling enthalpies and entropies substantially diminish in absolute value as pH is increased, suggesting that the magnitudes of molecular perturbations engendered by the binding of allosteric ligands do not correlate with the magnitudes of the functional consequences of those perturbations. Temperature and pH exert their influence on the observed allosteric behavior by changing the relative contributions made by the largely compensating DeltaH and TDeltaS terms to the coupling free energy. 相似文献
68.
SH Bernstein VL Brunetto FR Davey D Wurster-Hill RJ Mayer RM Stone CA Schiffer CD Bloomfield 《Canadian Metallurgical Quarterly》1996,14(9):2486-2494
PURPOSE: To determine the treatment outcome of standard acute myeloid leukemia (AML)-type chemotherapy in a subset of patients with newly diagnosed myelodysplastic syndromes (MDS) compared with that of patients with de novo AML as defined using French-American-British (FAB) criteria. In addition, to determine the pretreatment variables having prognostic significance for treatment outcome in patients with MDS. PATIENTS AND METHODS: Nine hundred seven newly diagnosed patients with no history of cytopenias having a local institutional de novo AML successfully karyotyped and treated on Cancer and Leukemia Group B (CALGB) protocols for AML from 1984 to 1992. Thirty-three of the 907 patients were reclassified as having MDS on central pathology review using FAB criteria and form the basis of this analysis. RESULTS: The treatment outcomes for patients with MDS and AML were similar; the complete remission (CR) rate was 79% and 68%, respectively (P = .37); median CR duration was 11 and 15 months, respectively (P = .28); and median survival was 13 and 16 months, respectively (P = .72). For the MDS patients, there were no prognostic variables for CR rate identified. For CR duration, only the Sanz classification had prognostic value. The prognostic factors for survival in a univariate analysis included age, WBC count, Sanz classification, and percent blood blasts. In a proportional hazards analysis of survival, age greater than 60 years and WBC less than 2.6 x 10(9)/L were adverse prognostic factors. CONCLUSION: In patients with no known history of cytopenias who are treated intensively at diagnosis, the FAB distinctions between MDS (refractory anemia with excess blasts and refractory anemia with excess blasts in transformation) and AML appear to have little therapeutic relevance. 相似文献
69.
The safety, toxicity, and pharmacokinetics of intrapartum and early newborn nevirapine were evaluated in 17 human immunodeficiency virus type 1-infected women in labor and their newborns. No adverse effects of nevirapine were noted in any study mothers or infants. Following maternal dosing with 200 mg during labor, concentrations exceeding 100 ng/mL (10 times the in vitro IC50) were achieved in the newborns. Nevirapine elimination was prolonged in both mothers and infants, with median half-lives ranging from 36.8 to 65.7 h. Administration of 200 mg orally to the mothers in labor and of a single 2-mg/kg oral dose to the infants at 48-72 h after birth maintained serum concentrations in the infants > 100 ng/mL through 7 days of life. 相似文献
70.
Judging by WHO criteria, there was not a single case in India in 1994 that could be taken as a confirmed case of plague. Both clinical and epidemiological features of the illness alleged to be plague were not at all compatible with those of plague-both bubonic and pneumonic types. The bacteriologic and serological evidence was limited to a few cases, and doubtful. PCR is a highly sensitive test, but the specificity of PCR for plague was not verified under field conditions in India. Just by the demonstration of the presence of a causative organism in the environment or in the body tissue, one cannot substantiate occurrence of an infection or disease in man. In view of the assessment and review presented in this paper, one can conclude that the outbreaks of illness that resembled plague during late 1994 in Beed District and Surat were certainly not due to plague. If the Mamla outbreak had not been declared to be plague, the probability of the Surat illness being labeled as plague was negligible. Whatever happened provides a very important lesson of the harm that can occur nationally and globally from decisions based on inadequate or incorrect information. 相似文献