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STRUCTURE OF COEXTENSIONS OF REGULAR SEMIGROUPS BY RECTANGULAR BANDS
Chandrasekaran, V.M. 한국전산응용수학회 2003 Journal of applied mathematics & informatics Vol.12 No.1
In this paper, we described the structure of coextensions of regular semigroups by rectangular bands.
SPLIT MAP AND IDEMPOTENT SEPARATING CONGRUENCE
CHANDRASEKARAN, V. M.,LOGANATHAN, M. 한국전산응용수학회 2005 Journal of applied mathematics & informatics Vol.18 No.1
Let T be a regular semigroup and let S be a regular subsemigroup of T. In this paper we study the relationship between the idempotent separating congruence on S and the idempotent separating congruence on T, when T and S are connected by a splitmap ${\theta} : T {\to} S$.
Structure of the Double Four-spiral Semigroup
CHANDRASEKARAN, V.M.,LOGANATHAN, M. Department of Mathematics 2003 Kyungpook mathematical journal Vol.43 No.4
In this paper, we first give an alternative description of the fundamental orthodox semigroup $\bar{A}$(1, 2). We then use this to represent the double four-spiral semigroup $DSp_4$ as a regular Rees matrix semigroup over $\bar{A}$(1, 2).
Structure of coextensions of regular semigroups by rectangular bands
V. M. Chandrasekaran 한국전산응용수학회 2003 Journal of applied mathematics & informatics Vol.12 No.1-2
In this paper, we described the structure of coextensions ofregular semigroups by rectangular bands.AMS Mathematics Subject Classication: 20M17.Keywords and Phrases: Regular semigroup, Coextension, rectangular band1. IntroductionThis paper is a continuation of the previous paper [1]. The structure of orthodoxsemigroups has been studied in [1] by using the technique in the paper [3] . Inthis paper, we use the same technique to study the structure of coextensionsos regular semigroups by rectangular bands. Since an orthodox semigroup is acoextension of inverse semigroup by rectangular bands this result generalises [1].2. PreliminariesWe use whenever possible the notation of Howie [2]. We also use the following
K. M. Madhu,P. S. Beena,M. Chandrasekaran 한국생물공학회 2009 Biotechnology and Bioprocess Engineering Vol.14 No.4
A potential fungal strain producing extracellular β-glucosidase enzyme was isolated from sea water and identified as Aspergillus sydowii BTMFS 55 by a molecular approach based on 28S rDNA sequence homology which showed 93% identity with already reported sequences of Aspergillus sydowii in the GenBank. A sequential optimization strategy was used to enhance the production of β-glucosidase under solid state fermentation (SSF) with wheat bran (WB) as the growth medium. The two-level Plackett-Burman (PB) design was implemented to screen medium components that influence β-glucosidase production and among the 11 variables, moisture content, inoculums, and peptone were identified as the most significant factors for β-glucosidase production. The enzyme was purified by (NH4)2SO4 precipitation followed by ion exchange chromatography on DEAE sepharose. The enzyme was a monomeric protein with a molecular weight of ~95 kDa as determined by SDS-PAGE. It was optimally active at pH 5.0 and 50°C. It showed high affinity towards pNPG and enzyme has a Km and Vmax of 0.67 mM and 83.3 U/mL, respectively. The enzyme was tolerant to glucose inhibition with a Ki of 17 mM. Low concentration of alcohols (10%), especially ethanol, could activate the enzyme. A considerable level of ethanol could produce from wheat bran and rice straw after 48 and 24 h, respectively, with the help of Saccharomyces cerevisiae in presence of cellulase and the purified β-glucosidase of Aspergillus sydowii BTMFS 55.