发布求助
文献互助 智能选刊 最新文献

Journal of biochemical toxicology最新文献

筛选
英文 中文
Preparation of tricalcium phosphate by hydrolysis of dicalcium phosphate with calcium hydroxide 用氢氧化钙水解磷酸二钙制备磷酸三钙
Journal of biochemical toxicology Pub Date : 2007-05-29 DOI: 10.1002/JBT.2570270204
H. M. Bhavnagary, J. S. Venugopal, S. Majumder
{"title":"Preparation of tricalcium phosphate by hydrolysis of dicalcium phosphate with calcium hydroxide","authors":"H. M. Bhavnagary, J. S. Venugopal, S. Majumder","doi":"10.1002/JBT.2570270204","DOIUrl":"https://doi.org/10.1002/JBT.2570270204","url":null,"abstract":"A hydrolysis reaction between dicalcium phosphate and calcium hydroxide has been \u0000investigated for the formation of tricalcium phosphate. It decreased steadily with the \u0000increase in aqueous dicalcium phosphate slurry concentration in the range of 0.5 to \u00001.25 % under steam pressures of 5-25 Ib/in2 and attained equilibrium at the concentration \u0000of 1.25 % aqueous dicalcium phosphate. During the initial period of 2 h, the \u0000hydrolysis proceeded gradually to the respective maximums at the steam pressures of \u000015 and 25 Ib/in2 and thereupon it was constant. It was also shown that 28.33 ?( excess \u0000above the stoichiometric quantity of the hydrolysing agent, calcium hydroxidc, was \u0000necessary for the complete hydrolysis to occur at the steam pressure of 25 Ib/in2 for \u0000the aqueous suspensions of 5 and 25 % dicalcium phosphate. The effect of increasing \u0000steam pressure showed that a complete conversion of dicalcium phosphate to tricalcium \u0000phosphate could be obtained at a steam pressure of 51.5 Ib/in2 for any concentration \u0000of aqueous phosphate slurry.","PeriodicalId":15255,"journal":{"name":"Journal of biochemical toxicology","volume":"30 1","pages":"393-398"},"PeriodicalIF":0.0,"publicationDate":"2007-05-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82094221","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Cement forming ability of silicate minerals and polyacid solution 硅酸盐矿物与聚酸溶液的成胶能力
Journal of biochemical toxicology Pub Date : 2007-05-29 DOI: 10.1002/JBT.2570270154
S. Crisp, Alan D. Wilson, J. H. Elliott, P. Hornsby
{"title":"Cement forming ability of silicate minerals and polyacid solution","authors":"S. Crisp, Alan D. Wilson, J. H. Elliott, P. Hornsby","doi":"10.1002/JBT.2570270154","DOIUrl":"https://doi.org/10.1002/JBT.2570270154","url":null,"abstract":"A preliminary survey of the cement-forming reactions between silicate minerals and polyacid solutions is presented. Reaction mixtures were assessed qualitatively for setting and hydrolytic stability and the compressive strength of some of the hardened cements was measured. The results are discussed in terms of the atomic structures of the minerals and polyacids employed.","PeriodicalId":15255,"journal":{"name":"Journal of biochemical toxicology","volume":"5 1","pages":"369-374"},"PeriodicalIF":0.0,"publicationDate":"2007-05-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81014943","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 6
Catalytic dehydrogenation of propane on chromia, palladium and platinum supported catalysts 丙烷在铬、钯和铂负载催化剂上的催化脱氢
Journal of biochemical toxicology Pub Date : 2007-05-29 DOI: 10.1002/JBT.2570270120
F. Ashmawy
{"title":"Catalytic dehydrogenation of propane on chromia, palladium and platinum supported catalysts","authors":"F. Ashmawy","doi":"10.1002/JBT.2570270120","DOIUrl":"https://doi.org/10.1002/JBT.2570270120","url":null,"abstract":"The dehydrogenation of propane to propylene over Cr2O3/Al2O3, Pd/Al2O3 and Pt/SiO2 has been investigated in the temperature range 580–618°C. Runs were performed on propane, alone or in the presence of nitrogen (as a diluent), with complete analysis of the reaction products. The reaction was carried out in a fixed bed reactor at space velocities from 450–800 h−1 which are close to industrial values and at pressures from 0.3 to 1 atm. A set of runs was made over a commercial chromia-alumina catalyst (10% Cr2O3) and over a promoted catalyst prepared in the laboratory by impregnation (16.8% Cr2O3 + 2% K2O). The latter catalyst showed high selectivity and stability even when subjected to continuous cycles of dehydrogenation, regeneration and purging. Of the two noble metal supported catalysts used, reduced Pd/Al2O3 showed higher activity than Pt/SiO2 at 618°C. The former catalyst gave a propylene yield of around 98% at 20% conversion level.","PeriodicalId":15255,"journal":{"name":"Journal of biochemical toxicology","volume":"61 1","pages":"137-142"},"PeriodicalIF":0.0,"publicationDate":"2007-05-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79083308","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 7
Studies with inorganic ion exchange membranes—a membrane selective to strontium ion 无机离子交换膜的研究-一种对锶离子选择性的膜
Journal of biochemical toxicology Pub Date : 2007-05-29 DOI: 10.1002/JBT.2570270608
A. Jain, S. Srivastava, R. Singh, S. Agrawal
{"title":"Studies with inorganic ion exchange membranes—a membrane selective to strontium ion","authors":"A. Jain, S. Srivastava, R. Singh, S. Agrawal","doi":"10.1002/JBT.2570270608","DOIUrl":"https://doi.org/10.1002/JBT.2570270608","url":null,"abstract":"Strontium tungstoarsenate membrane shows response for Sr2+ and can be used to determine the activity of these ions. The response time of the membrane is a few seconds and the potentials generated are reproducible. The membrane electrode can be used for one year without any drift in potentials. The membrane was found to be more selective to Sr2+ ions than to many other of univalent, bivalent and tervalent cations. Anions also show no interference.","PeriodicalId":15255,"journal":{"name":"Journal of biochemical toxicology","volume":"36 1","pages":"680-684"},"PeriodicalIF":0.0,"publicationDate":"2007-05-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"91125948","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 9
Hydration of calcium sulphate hemihydrate in the presence of calcium hydroxide 半水合硫酸钙在氢氧化钙存在下的水合作用
Journal of biochemical toxicology Pub Date : 2007-05-29 DOI: 10.1002/JBT.2570270119
M. J. Ridge, G. King
{"title":"Hydration of calcium sulphate hemihydrate in the presence of calcium hydroxide","authors":"M. J. Ridge, G. King","doi":"10.1002/JBT.2570270119","DOIUrl":"https://doi.org/10.1002/JBT.2570270119","url":null,"abstract":"A study has been made of the effects of calcium hydroxide on the hydration of calcium sulphate hemihydrate in accelerated, inhibited and unmodified systems, using techniques developed in this laboratory. The results were interpreted in terms of an equation developed earlier, and the parameters k (which is related to the transport of matter in the system) and α0 (which is a measure of heterogeneous nucleation) determined. A small addition of calcium hydroxide leads in all cases to a sharp increase in k. Further additions lead only to effects caused by dilution of the system. Calcium hydroxide has complex effects on α0. These are large in inhibited systems. The basic effects of calcium hydroxide are to increase the concentration of hydroxyl ions which have specific effects, increase the concentration of Ca2+ ions, adsorb inhibitors and extend the system as an inert diluent.","PeriodicalId":15255,"journal":{"name":"Journal of biochemical toxicology","volume":"1 1","pages":"125-136"},"PeriodicalIF":0.0,"publicationDate":"2007-05-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"88896555","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 5
Estimation of productivities in repeated fed batch cephalosporn fermentation 分批次重复投料头孢菌素发酵产率的估计
Journal of biochemical toxicology Pub Date : 2007-05-29 DOI: 10.1002/JBT.2570270132
A. Trilli, Verardo Michelini, V. Mantovani, S. Pirt
{"title":"Estimation of productivities in repeated fed batch cephalosporn fermentation","authors":"A. Trilli, Verardo Michelini, V. Mantovani, S. Pirt","doi":"10.1002/JBT.2570270132","DOIUrl":"https://doi.org/10.1002/JBT.2570270132","url":null,"abstract":"The theory of fed batch culture was tested on the cephalosporin C fermentation. In repeated fed batch culture a constant fraction of the culture volume is removed at fixed intervals. Since the productivity (output rate/unit volume) and specific rate of product formation may vary throughout the fed batch cycle, an “average productivity” and “average specific rate of product formation” which describe the overall behaviour of the system over several cycles are introduced. The test shows that the quasi-steady state of cephalosporin production predicted by fed batch theory can be maintained during at least 3.6 culture volume changes. The fed batch method of culture increased the productivity of the culture about 1.3 times with respect to that of simple batch culture whilst the cephalosporin C concentration was about the same in each type of culture.","PeriodicalId":15255,"journal":{"name":"Journal of biochemical toxicology","volume":"3 1","pages":"219-224"},"PeriodicalIF":0.0,"publicationDate":"2007-05-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"87271370","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 12
Effect of thermal treatment on Egyptian rice straw hardboard 热处理对埃及稻秸硬纸板的影响
Journal of biochemical toxicology Pub Date : 2007-05-29 DOI: 10.1002/JBT.2570270114
N. A. Fadl, M. Z. Sefain, M. Rakha
{"title":"Effect of thermal treatment on Egyptian rice straw hardboard","authors":"N. A. Fadl, M. Z. Sefain, M. Rakha","doi":"10.1002/JBT.2570270114","DOIUrl":"https://doi.org/10.1002/JBT.2570270114","url":null,"abstract":"The effects of thermal treatment on the bending strength and water resistance of Egyptian rice straw hardboard manufactured with, or without, different amounts of resins, were investigated. The bending strength falls with increase in heating time and temperature for samples up to 1.5% resin; whereas hardboard with 3% resin showed an initial improvement in bending strength after heating at 140, 160 and 180°C. Heating samples at 200°C drastically reduces bending strength. Water resistance of all samples was improved by heat treatment.","PeriodicalId":15255,"journal":{"name":"Journal of biochemical toxicology","volume":"6 1","pages":"93-98"},"PeriodicalIF":0.0,"publicationDate":"2007-05-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75521379","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 4
Thermal conductivity and viscosity of normal C2–C6 aliphatic carboxylic Acids 正常C2-C6脂肪族羧酸的导热性和粘度
Journal of biochemical toxicology Pub Date : 2007-05-29 DOI: 10.1002/JBT.2570270144
W. Kynaston, J. F. Martin
{"title":"Thermal conductivity and viscosity of normal C2–C6 aliphatic carboxylic Acids","authors":"W. Kynaston, J. F. Martin","doi":"10.1002/JBT.2570270144","DOIUrl":"https://doi.org/10.1002/JBT.2570270144","url":null,"abstract":"Equipment for measurements of thermal conductivity and viscosity of liquids in the temperature range 273–350 K and at atmospheric pressure is described. The thermal conductivity and viscosity of acetic, propionic, butyric, valeric and hexanoic acids in the liquid state have been measured. The values obtained are compared with published data and the ratio of thermal conductivity, λ, to viscosity, η, is examined in the form of the dimensionless quantities, Mλ/Rη and cpη/λ (Prandtl number).","PeriodicalId":15255,"journal":{"name":"Journal of biochemical toxicology","volume":"435 1","pages":"296-302"},"PeriodicalIF":0.0,"publicationDate":"2007-05-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"76498240","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 2
The solubilities of Fe, Ni, V and Na salts in concentrated aqueous H2SO4 solutions at temperatures between 400 and 460 K Fe、Ni、V和Na盐在400 ~ 460 K的浓硫酸水溶液中的溶解度
Journal of biochemical toxicology Pub Date : 2007-05-29 DOI: 10.1002/JBT.2570270503
W. D. Halstead, Bernard F. Lovey
{"title":"The solubilities of Fe, Ni, V and Na salts in concentrated aqueous H2SO4 solutions at temperatures between 400 and 460 K","authors":"W. D. Halstead, Bernard F. Lovey","doi":"10.1002/JBT.2570270503","DOIUrl":"https://doi.org/10.1002/JBT.2570270503","url":null,"abstract":"When residual fuel oil, which contains up to 4 wt% S, is burned in boiler plant, H2SO4 is formed which condenses as aqueous solutions (65–90 wt% H2SO4) on surfaces in the cool back-end. The oil contains traces of other elements, in particular Na, V, Fe and Ni, which also deposit on these surfaces as either sulphates (Na, Fe, Ni,) or oxides (V). When designing techniques to control acid deposition and the corrosion which it subsequently causes, account must be taken of the degree to which the acid properties can be modified by taking these compounds into solution. A series of measurements of the solubilities of relevant compounds in acid solutions within the appropriate ranges of concentration and temperature (400–460 K) have been made. Sodium sulphate has by far the highest solubility (55 wt% in a solution originally containing 85 wt% H2SO4 at 423 K). Of the other compounds considered, only V2O5 exhibits a solubility of more than 2 wt%; for example, at 463 K, in 75 wt% H2SO4, solutions containing up to 16 wt% V2O5 can be formed. Solutions with up to 23 wt% V2O5 can be stabilised by the presence in solution of small amounts (∼0.5 wt%) of Fe3+ ions. The structure of these solutions is discussed.","PeriodicalId":15255,"journal":{"name":"Journal of biochemical toxicology","volume":"93 1","pages":"585-592"},"PeriodicalIF":0.0,"publicationDate":"2007-05-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"76953838","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Influence of inorganic salts on the hydration of tricalcium silicate 无机盐对硅酸三钙水化的影响
Journal of biochemical toxicology Pub Date : 2007-05-29 DOI: 10.1002/JBT.2570270128
R. Kondo, M. Daimon, E. Sakai, Hiraotaka Ushiyama
{"title":"Influence of inorganic salts on the hydration of tricalcium silicate","authors":"R. Kondo, M. Daimon, E. Sakai, Hiraotaka Ushiyama","doi":"10.1002/JBT.2570270128","DOIUrl":"https://doi.org/10.1002/JBT.2570270128","url":null,"abstract":"The influence of various chlorides and potassium salts on the hydration of alite (3CaO·SiO2 solid solution) has been studied by conduction calorimetry and an explanation based on diffusion experiments in hardened Portland cement is presented. The mechanism of the action of inorganic electrolytes on cement hydration was also investigated. In hardened Portland cement the diffusion rate of the Cl− ion was greater than that of the coexisting cations. The accelerating effect of inorganic electrolytes was dependent mainly on the mobility of anions. The higher the anion mobility, the greater was the accelerating effect on the hydration. It is shown that the hydration of alite is a topochemical reaction and that the rate of hydration of alite is controlled by the rate of the dissolution of Ca2+ or OH− ions into a liquid phase. It is concluded that the dissolution of OH− ions from the hydrate layer around the cement particle is increased when the reciprocal diffusion action of the anion accelerates the hydration.","PeriodicalId":15255,"journal":{"name":"Journal of biochemical toxicology","volume":"287 1","pages":"191-197"},"PeriodicalIF":0.0,"publicationDate":"2007-05-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"73210890","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 41
首页 上一页 下一页 尾页
0
×
引用
GB/T 7714-2015
复制
MLA
复制
APA
复制
导出至
BibTeX EndNote RefMan NoteFirst NoteExpress
×
提示
您的信息不完整，为了账户安全，请先补充。
现在去补充
×
提示
您因"违规操作"
具体请查看互助需知
我知道了
×
提示
现在去查看 取消
×
提示
确定
请完成安全验证×
相关产品
×
本文献相关产品
联系我们：info@booksci.cn Book学术提供免费学术资源搜索服务，方便国内外学者检索中英文文献。致力于提供最便捷和优质的服务体验。 Copyright © 2023 布克学术 All rights reserved.
京ICP备2023020795号-1
ghs 京公网安备 11010802042870号
Book学术文献互助
Book学术文献互助群
群 号：481959085
Book学术官方微信