✦ LIBER ✦

Dispersion of growth rates of d-xylose crystals in aqueous solutions—influence of the presence of ethanol as a co-solvent and of d-mannose as a co-solute

✍ Scribed by Nadine Gabas; Claude Laguerie

Publisher: Elsevier Science
Year: 1991
Tongue: English
Weight: 765 KB
Volume: 46
Category: Article
ISSN: 0009-2509
DOI: 10.1016/0009-2509(91)85067-8

No coin nor oath required. For personal study only.

✦ Synopsis

New data on the growth rates of u-xylose crystals in aqueous solutions either devoid of Dmannose or containing this sugar as a co-solute and in hydroalcoholic solutions, obtained in a batch isothermal laboratory-scale seeded crystallizer, are reported. Growth kinetics have been evaluated from successive crystal size distributions (CSDs) recorded by means of a laser light scattering size analyser. The experiments have emphasized a broadening of the CSD during growth in any type of solution and a decrease of the overall u-xylose growth rate due to the presence of ethanol or o-mannose. Growth kinetic models have been identified from direct analysis of oversize cumulative number CSDs and from the population balance equation. Solutions to population balance equations have proved that growth rate dispersion rather than an intrinsic dependence of the crystal growth rates on crystal size is responsible for the variability of growth. A time-averaged growth rate equation as well as a growth rate diffusivity parameter have been identified in each type of solution.

📜 SIMILAR VOLUMES

Adsorption Isotherms of Citric Acid Acti

Adsorption Isotherms of Citric Acid Acting as a Growth-Suppressor onto the (100) and (111) Faces of Sodium Chloride Crystals in Supersaturated Aqueous Solution

✍ S. Sasaki; N. Kubota; N. Doki 📂 Article 📅 2006 🏛 John Wiley and Sons 🌐 English ⚖ 112 KB 👁 2 views

13C-C.p.-m.a.s. n.m.r. studies of frozen

13C-C.p.-m.a.s. n.m.r. studies of frozen solutions of (1→4)-α-d-glucans as a probe of the range of conformations of glycosidic linkages: The conformations of cyclomaltohexaose and amylopectin in aqueous solution

✍ Michael J. Gidley; Stephen M. Bociek 📂 Article 📅 1988 🏛 Elsevier Science 🌐 English ⚖ 302 KB

Acute and Chronic Toxicity of Veratrum V

Acute and Chronic Toxicity of Veratrum Viride††The Veratrum viride studied was the whole-powdered drug marketed by Irwin, Neisler & Co. under the name, Vertavis. The work reported herein was supported by a grant from this firm. The batch of powder used in these experiments was stated by the manufacturer to have been assayed biologically by the Craw method on Daphnia magna. One Craw unit of the material studied was stated to be 15.6mg. With regard to this assay, Mr. R. O. Craw has been so kind as to allow us to publish a brief explanation: A reference lot of Yerolrum oirid; powder was set-aside as a standard and a 10% w/v aqueous extract was made of this powder. The average median length of life in 50 assays of 1000 daphnia on immersion in the solution was determined to be 2.22 hours. The daphnia were considered dead when the heart was found to be in systolic standstill on microscopic examination. Succeeding lots of powder were assayed and their potency determined by relating the median length of life of daphnia to 2.22 hours, which is one unit. Twenty assays of 10 animals each were used on each lot of powder.‡‡The authors wish to thank Dr. J. F. A.,McManus of the Department of Pathology for a pathologic report on the tissues, and Mr. James Thomas and Mrs. Bobby E. Teague for technical assistance.

✍ Perdue, Adoline S. ;Bell, Frances ;Starnes, W.R. ;Hitchcock, Philip ;Teague, R.S 📂 Article 📅 1950 🏛 Elsevier ⚖ 346 KB 👁 1 views