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1.
2.
Summary The enzymes a-amylase, invertase and glucoamylase were immobilized on acid activated montmorillonite using two techniques,
viz. adsorption and covalent binding, and their activities were tested in a batch and packed-bed reactor and were compared. The
packed-bed reactor showed an improved performance for all immobilized enzymes, which was attributed to lowering of diffusional
restrictions to mass transfer. Lower activity in case of batch reactor for immobilized invertase was due to a combined effect
of loss of native conformation of enzyme on account of immobilization and mass transfer resistances due to improper diffusion
of substrate to the active site of enzyme. For immobilized glucoamylase, the packed-bed reactor demonstrated exceptionally
high activity that was very close to the free enzyme. Covalently bound glucoamylase showed higher activity than the free enzyme. 相似文献
3.
J. K. Sankaran 《International Journal of Game Theory》1991,19(4):329-338
Kohlberg (1972) has shown how the nucleolus for ann-person game with side-payments may be found by solving a single minimization LP in case the imputation space is a polytope. However the coefficients in the LP have a very wide range even for problems with 3 or 4 players. Therefore the method is computationally viable only for small problems on machines with finite precision. Maschler et al. (1979) find the nucleolus by solving a sequence of minimization LPs with constraint coefficients of either –1, 0 or 1. However the number of LPs to be solved is o(4
n
). In this paper, we show how to find the nucleolus by solving a sequence of o(2
n
) LPs whose constraint coefficients are –1, 0 or 1. 相似文献
4.
5.
G. Date T. R. Govindarajan P. Sankaran R. Shankar 《Communications in Mathematical Physics》1990,132(2):293-313
We compute the homotopy groups
0 and
1 of the classical configuration space of anO(3) invariant field theory on
×, where
is a compact two dimensional manifold for arbitrary genusg and- denotes the time coordinate. We also present the finite dimensional, unitary, irreducible, inequivalent representations of the appropriate fundamental groups and comment on some of their implications. 相似文献
6.
7.
Fluorescence signalling of the transition metal ions: Design strategy based on the choice of the fluorophore component 总被引:1,自引:0,他引:1
Transition metal ions are notorious for their fluorescence quenching abilities. In this paper, we discuss the design strategies
for the development of efficientoff-on fluorescence signalling systems for the transition metal ions. It is shown that even simplefluorophore-spacer-receptor systems can display excellentoff-on fluorescence signalling towards the quenching metal ions when the fluorophore component is chosen judiciously. 相似文献
8.
A K Sood K Sankaran Y Hariharan S Vijayalakshmi V Sankara Sastry S Kalavathi J Janaki 《Pramana》1988,31(5):389-397
We report infrared absorption of Y1Ba2Cu3O7−δ
as a function of oxygen stoichiometry (0<δ<1) and copper substitution by iron in the spectral range of 450–700 cm−1. The strong bands associated with Cu-O vibrations undergo significant changes in their frequencies and intensities asδ is varied across the orthorhombic to tetragonal phase. These changes coupled with those arising as a result of doping with
iron has helped in identifying the nature of the vibrational modes. 相似文献
9.
10.
K. Jeevarenuka G. Sankaran Pillai P. Shahul Hameed R. Mathiyarasu 《Journal of Radioanalytical and Nuclear Chemistry》2014,302(1):245-252
The activity concentrations and absorbed gamma dose of primordial radionuclides 238U, 232Th and 40K were determined employing γ-ray spectrometry in 31 soil samples from the land area earmarked for house construction in Perambalur district and 14 rock samples from quarries that supply stones for the entire district. The soil samples registered relatively a higher mean value of 13.2 Bq kg?1 for 238U, 66 Bq kg?1 for 232Th and 340.3 Bq kg?1 for 40K as compared to mean values for rock samples (238U—8.0 Bq kg?1; 232Th—65.1 Bq kg?1; 40K—199.1 Bq kg?1). The mean absorbed gamma dose rate for soil (61.4 nGy h?1) marginally exceeded the prescribed limit of 55 nGy h?1 while, rocks registered the mean absorbed gamma dose rate of 10.4 nGy h?1. The mean radium equivalent activity was distinctly higher in soil (130.6 Bq kg?1) than in rock (20.0 Bq kg?1). However, these values were lower than the limit (370 Bq kg?1) set by OECD for building materials. It is evident from the data that the soil and rocks do not pose any radiological risk for house constructions in Perambalur district. 相似文献