Proton Pump Inhibition : A New Therapeutic Era from Gastroenterology

Yeomans, Neville D. Medical Publications Korea 1990 Medical Progress Vol.12 No.9

PEPTIC ULCER

Yeomans, Neville D. Medical Publications Korea 1991 Medical Progress Vol.13 No.2

Microbial production of Water-Soluble Non Curdlan Type Exopolymer-B with Controlled Composition by Agrobacterium sp.

Lee, Jin W.,Yeomans, Walter G.,Allen, Alfred L.,Gross, Richard A.,Kaplan, David L. 東亞大學校附設遺傳工學硏究所 1998 遺傳工學硏究 Vol.- No.5

The cell growth, production of exopolymers, and the molar ratio of glucose to mannose in the water-soluble non curdlan type exopolymer-B (WSNCE-B), which is one of three exopolymers purified from the culture of Agrobacterium sp. varied with carbon source, culture medium, and initial medium pH. The molar percentage of rhamnose, a ninor component in WSNCE-B, varied up to 13%, dependent on physiological condition. No rhamnose was found in the WSNCE-B purified from the culture with initial medium pH>6.8. The relative amount of mannose in WSNCE-B increased regularly with the amount of yeast extract added to the mineral salts medium. The relative amounts of glucose, mannose, and rhamnose in the WSNCE-B can be controlled by varying culture conditions.

Production of zoogloea gum by Zoogloea ramigera with glucose analogs

Lee, Jin W.,Yeomans, Walter G.,Allen, Alfred L.,Gross, Richard A.,Kaplan, David L. 東亞大學校附設遺傳工學硏究所 1998 遺傳工學硏究 Vol.- No.5

Zoolgans with altered sugar composition were synthesized by Zoogloea ramigera by varying the glucose concentration and initial medium pH. The relative mol% of the sugar components, glucose and galactose, in the exopolymer made with 2% (w/v) glucose as the carbon source was 66 and 34%, respectively. By varying the glucose concentration and initial medium pH, the mol% ratios of glucose to galactose in zooglan ranged from 70:30 to 58:42. Also, glucose analogs, 3-O-methyl-D-glucose, 2-amino-2-deoxy-D-glucose, and 2-acetamido-2-deoxy-D-glucose, were used as a co-substrate with glucose to produce to produce modified zooglans. The mol% ratios of glucose to galactose in exopolymers produced by co-feeding glucose analogs ranged from 70:30 to 9:91.

Opioid induced hyperalgesia in anesthetic settings

이현정,David C. Yeomans 대한마취통증의학회 2014 Korean Journal of Anesthesiology Vol.67 No.5

Pain is difficult to investigate and difficult to treat, in part, because of problems in quantification and assessment. The useof opioids, combined with classic anesthetics to maintain hemodynamic stability by controlling responses to intraoperativepainful events has gained significant popularity in the anesthetic field. However, several side effects profiles concerningperioperative use of opioid have been published. Over the past two decades, many concerns have arisen with respectto opioid-induced hyperalgesia (OIH), which is the paradoxical effect wherein opioid usage may decrease pain thresholdsand increase atypical pain unrelated to the original, preexisting pain. This brief review focuses on the evidence,mechanisms, and modulatory and pharmacologic management of OIH in order to elaborate on the clinical implicationof OIH.

Compositional consistancy of a heteropolysaccharide-7 produced by Beijerinckia indica

Lee, Jin W.,Yeomans, Walter G.,Allen, Alfred L.,Gross, Richard A.,Kaplan, David L. 東亞大學校附設遺傳工學硏究所 1998 遺傳工學硏究 Vol.- No.5

The component sugars of heteropolysaccharide-7(PS-7) produced by Beijerinckia indica were rhamnose and glucose (1.0:4.8,mol:mol) by gas chromatographic analysis. Galacturonic acid, previously reported as a repeat unit of PS-7, was not found in purified PS-7. The yield of PS-7 varied with physiological conditions, such as concentration of carbon source and initial pH of medium, but the molar ratio of rhamnose to glucose stayed within 1.0 to 4.6-5.1. B indica utilized glucose and some glucose analogs as carbon sources and produced exopolymers, although there was no direct incorporation of these sugars into PS-7. The molar ratio of rhamnose to glucose in each polymer synthesized from glucose-related sugars showed no significant variation(1.0 to 4.5-4.7).

FEATURED Mathematical Programming Approaches to the Synthesis of Chemical Process Systems

Grossmann, Ignacio E .,Caballero, Jose Antonio,Yeomans, Hector 한국화학공학회 1999 Korean Journal of Chemical Engineering Vol.16 No.4

This paper presents a review of advances that have taken place in the mathematical programming approach to process design and synthesis. A review is first presented on the algorithms that are available for solving MINLP problems, and its most recent variant, Generalized Disjunctive Programming models. The formulation of superstructures, models and solution strategies is also discussed for the effective solution of the corresponding optimization problems. The rest of the paper is devoted to reviewing recent mathematical programming models for the synthesis of reactor networks, distillation sequences, heat exchanger networks, mass exchanger networks, utility plants, and total flowsheets. As will be seen from this review, the progress that has been achieved in this area over the last decade is very significant.

Production of Chitosan- and Chitin-like Exopolymers by Acetobacter xylinum ATCC 10245

Lee,Jin W.,Deng,Fang,Yeomans,Walter G.,Allen,Alfred L.,Gross,Richard A.,Kaplan,David L. 한국생명과학회 1998 한국생명과학회 학술발표회 Vol.20 No.-

To biosynthesize modified cellulose, glucose analogs including 3-O-methyl-D-glucose, glucosamine, N-acetylglucosamine, and 2-deoxy-D-glucose were used separately as the carbon source. Incorporation of glucosamine and N-acetylglucosamine repeat units into cellulose by Acetobacter xylinum ATCC 10245 was confirmed by GC, GC/MS, FTIR and ¹H-NMR. Based on data, the average molar percentages of glucosamine and N-acetylglucosamine repeat units into exopolymers were 19% and 18%, respectively. The yields of exopolymers made with glucosamine and N-acetylglucosamine as carbon source after 7 day culture were 0.37 ㎎/㎖ and 0.67 ㎎/㎖ , respectively, whereas that of glucose was 3.9 ㎎/㎖. The yield of exopolymer made with the mixture of glucose (0.5%, v/v) and glucosamine (1.5%, v/v) as carbon sources was 1.75 ㎎/㎖, and the average molar percentage of glucosamine repeat unit into the exopolymer was 17%. Exopolymers made with glucosamine and N-acetylglucosamine were fractionated by 10% acetic acid and DW, respectively, The molar ratio of glucose to glucosamine in the acetic acid (10%, v/v) soluble fractionation of glucosamine incorporated exopolymer was 0.6: 1.0. The molar ratio of glucose to N-acetylglucosanune in the water soluble fraction of N-acetylglucosamine incorporated exopolymer was 0.8 : 1.0.

Biosynthesis of Novel Exopolymers by Aureobasidium pullulans

Lee,Jin W.,Deng,Fang,Yeomans,Walter G.,Allen,Alfred L.,Gross,Richard A.,Kaplan,David L. 한국생명과학회 1998 한국생명과학회 학술발표회 Vol.20 No.-

Exopolymers produced by A. pullulans ATCC 42023 under aerobic conditions with glucose, mannose, and glucose analogs including 3-O- methyl-D-glucose, glucosamine, N-acetylglucosamine, and 2-deoxy-D- glucose as carbon sources contained glucose and mannose. The molar ratio of glucose to mannose in exopolymers and the molecular weight of exopolymers varied with the carbon source and culture time. Exopolymers synthesized with glucose and mannose as carbon sources showed glucose contents of 87±3 and 89±2%, respectively, with a decreased molecular weight from 3.50 - 2.12 x 10^6 to 0.85 - 0.77 x 10^6 with culture time. The molar ratio of glucose to mannose in the exopolymer synthesized with glucosamine changed from 55±3 : 45±3 to 29±2 : 71±2 and its molecular weight increased from 2.73 x 10^6 to 4.86 x10^6 with culture time. The molar ratio of glucose to mannose in exopolymers ranged from 87±3 : 13±3 to 28±2 : 72±2 and can be controlled by carbon source. On the basis on the results from enzyme hydrolysis of the exopolymers and comparison of ¹H- and ^(13)C-NMR chromatograms, the mannose as a monomeric component is substituted for glucose without changing the structure of pullulan.

Exopolymers from curdlan production: Incorporation of glucose-related sugars by Agrobacterium sp. strain ATCC 31749

Lee, Jin W.,Allen, Alfred L.,Deng, Flank,Yeomans, Walter G.,Kaplan, David L.,Gross, Richard A. 東亞大學校附設遺傳工學硏究所 1998 遺傳工學硏究 Vol.- No.5

Three different exopolymers were purified from cultures of Agrobacterium sp. strain ATCC 31749 grown in a mineral salts medium containing 2% glucose at 30℃ for 5 days under aerobic culture conditions. These exopolymers were curdlan (extracellular, homo-B-(1-3)-gulcan.water insoluble at neutral pH), a water-soluble noncurdlan-type exopolymer A (WSNCE-A), and a water-soluble noncurdlan-type exopolymer B (WSNCE-B). Curdlan. WSNCE-A. and WSNCE-B composed by weight 61,27,and 12%,respectively, of the exopolymer produced from goucose. Compositions of all polymers were confirmed by gas chromatography (GC) and gas chromatography -mass spectrometry(GC-MS). The WSNCE-A is composed of glucose and galactose with lower contents of rhamnose. The WSNCE-B consists of glucose and mannose. To biosynthesize modified biopolymers, glucose-related sugars including 3-0-methyl-D-glucose, 2-amino-2-deoxy-D-glucose, and 2-acetamido-2-deoxy-D-glucose(N-acetylgucosamine)were fed separately as the sole carbon source. Using 3-O-methyl-D-glucose, 8-12 mol% of the curdlan repeats were 3-O-methyl-D-glucose based on GC and H-nuclear magnetic resonance spectrometry. N-Acetylgucosamine was incorporated into WSNCE-A at 10 mol% based on the GC-MS but was not found in curdlan or WSNCE-B. Trois exopolymeres differents ont ete purifies a partir de cultures d'Agrobacterium sp. souche ATCC 31749, dont la croissance s'est effectuee a 30℃ durant 5 jours sur un milieu contenant des sels mineraux et 2% de glucose dans des conditions aerobies. Ces trois exopolymeres se sontreveles etre:un type coagule(curdlan) extracellulaire. insoluble dans 1'eau a pH neutre et constitue d'homo-B-(1-3)-glucane, et deux types solubles, non coagules, soit 1'exopolymere A (WSNCE-A) et 1'exopolyere B(WSNCE-B). Les poids respectifs du type coagule esdes deux types noncoagules A et B ont represente 61,27 et 12% de 1'exopolymere produit a partir du glucose. La composition de chacun des polymeres a ete identifiee par chromatographie en phase gazeuse(GC) et par chromatographie en phage gazeuse-spectrometrie de masse (GC-MS). Le WSNCE-A s'est revele constitue de glucose et de galactose avec faible teneur en rhamnose, et lw WSNCE-B, de glucose et de mannose. Dans le but de biosynthetiser des biopolymeres modifies, des sucres apparentes au glucose ont ete incorpores separement aux milieux de culture comme seule source de carbone:le 3-O-methyl-D-glucose, le 2-amino-2-desoxy-D-glucose, et le 2-acetamido-2-desoxy-D-glucose(N-acetylgulcosamine). Utilisant le 3-O-methyl-D-glucose, 8-12 mol% des repetitions du type coagule ont ete du 3-O-methyl-D-glucose, d'apres la GC et la spectrometrie de resonnance magnetique nucleaire-'H. La N-acetylglucosamine a ete incorporee dans le WSNCE-A a 10 mol% d'apres les GC-MS, mails il n'a pas ete trouve chez les exopolymeres coagules ou le WSNCE-B.