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Dr. Sivaraman Balasubramaniam Dr. Sneh Badle Dr. Swati Badgujar Dr. Vinod P. Veetil Dr. Vidhya Rangaswamy 《Chembiochem : a European journal of chemical biology》2021,22(4):705-711
A method for producing buta-1,3-diene (1,3-BD) by an amalgamation of chemical and biological approaches with syngas as the carbon source is proposed. Syngas is converted to the central intermediate, acetyl-CoA, by microorganisms through a tetrahydrofolate metabolism pathway. Acetyl-CoA is subsequently converted to malonyl-CoA using a carbonyl donor in the presence of a carboxylase enzyme. A decarboxylative Claisen condensation of malonyl-CoA and acetaldehyde ensues in the presence of acyltransferases to form 3-hydroxybutyryl-CoA, which is subsequently reduced by aldehyde reductase to give butane-1,3-diol (1,3-BDO). An ensuing dehydration step converts 1,3-BDO to 1,3-BD in the presence of a chemical dehydrating reagent. 相似文献
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Debasish Mishra K. Muralidhar P. Munshi 《Numerical Heat Transfer, Part B: Fundamentals》2013,63(4):485-506
The present work is concerned with the development of a robust reconstruction algorithm for applications involving tomography. In an earlier study it was shown that among the ART family of algorithms, the multiplicative algebraic reconstruction algorithm (MART) was the most appropriate for tomographic reconstruction [1]. In the present work, the MART algorithm has been extended so that (a) its performance is now acceptable over a wider range of relaxation factors, (b) the time requirement for convergence to a solution is lower, and (c) its performance is less sensitive to noise in the projection data. Applications considered for evaluating the proposed algorithms are (1) a circular region with holes, (2) a three-dimensional temperature field in a differentially heated fluid layer, and (3) experimental data recorded in a differentially heated fluid layer using an interferometer. The proposed algorithms are seen to be an improvement over those presently available, for all three examples considered. 相似文献
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Raghavendra C. Mundargi Namdev B. Shelke V. Ramesh Babu Pradip Patel Vidhya Rangaswamy Tejraj M. Aminabhavi 《应用聚合物科学杂志》2010,116(3):1832-1841
Thermoresponsive microspheres of gellan gum‐poly(N‐isopropylacrylamide), i.e., GG‐P(NIPAAm) semi‐interpenetrating polymer networks (semi‐IPNs) have been prepared by ionic crosslinking and used to study the controlled release (CR) of atenolol (ATL), an antihypertensive drug. Interaction of the drug with polymers was studied by Fourier transform infrared (FTIR) spectroscopy. Differential scanning calorimetry (DSC) was used to confirm the polymorphism and molecular level dispersion of ATL. Scanning electron microscopy (SEM) indicated spherical nature and smooth surfaces of the microspheres with some debris attached on their surfaces. Mean particle size measured by laser light diffraction ranged between 34 and 76 μm. Equilibrium swelling performed at 25°C and 37°C in pH 7.4 phosphate buffer exhibited thermoresponsive nature of the polymers. In vitro drug release performed at 25°C and 37°C indicated temperature‐dependency of ATL release, which was extended up to 12 h. In vitro release profiles at both the temperatures confirmed thermoresponsive nature of the polymers giving pulsatile trends. The % cumulative release data have been fitted to an empirical equation to estimate transport parameters and to understand the nature of drug release. © 2010 Wiley Periodicals, Inc. J Appl Polym Sci, 2010 相似文献
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In the implementation of hierarchical schemes for the adaptive control of large communication networks, decomposition of the overall network into node clusters and assignment of a supervisor for each cluster are of central importance. A formulation of the decomposition problem as a mathematical optimization problem is given and an algorithm for solution is presented. 相似文献
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D Mangapathi Rao M Muralidhar T Somaiah V Hari Babu 《Bulletin of Materials Science》1991,14(2):199-206
Influence of sintering time and quenching in Bi2 −x
Pb
x
Ca2Sr2Cu3O
y
(x=0.0, 0.1, 0.2, 0.25, 0.3 and 0.4) samples have been studied by resistance and XRD measurements. In samples sintered at 850°C
for 4 days,T
c(0) increases with Pb concentration.T
c(0) increased from 81 K forx=0.0 to 109 K inx=0.30 sample and then decreased. Increasing the sintering time to 10 days decreased theT
c Quenching further decreased theT
c(0). From X-ray diffraction patterns, the intensity peaks of low and highT
c phases have been measured. The addition of Pb promotes highT
c-phase. Sintering time, slow cooling and rapid quenching studies show that there is an optimum sintering time and cooling
rate to produce a highT
c-phase. 相似文献