http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
Rao Ravella Sreenivas,Jyothi Cherukuri Pavanna,Prakasham Reddy Shetty,Rao Chaganti Subba,Sarma Ponnupalli Nageshwara,Rao Linga Venkateswar The Microbiological Society of Korea 2006 The journal of microbiology Vol.44 No.1
Candida tropicalis was treated with ultraviolet (UV) rays, and the mutants obtained were screened for xylitol production. One of the mutants, the UV1 produced 0.81g of xylitol per gram of xylose. This was further mutated with N-methyl-N'-nitro-N-nitrosoguanidine (MNNG), and the mutants obtained were screened for xylitol production. One of the mutants (CT-OMV5) produced 0.85g/g of xylitol from xylose. Xylitol production improved to 0.87 g/g of xylose with this strain when the production medium was supplemented with urea. The CT-OMV5 mutant strain differs by 12 tests when compared to the wild-type Candida tropicalis strain. The XR activity was higher in mutant CT-OMV5. The distinct difference between the mutant and wild-type strain is the presence of numerous chlamvdospores in the mutant. In this investigation, we have demonstrated that mutagenesis was successful in generating a superior xylitol-producing strain, CT-OMV5, and uncovered distinctive biochemical and physiological characteristics of the wild-type and mutant strain, CT-OMV5.
Novel clays: Solid-state synthesis, characterization and cation exchange selectivity
Sridhar Komarneni,Ramesh Ravella 한국물리학회 2008 Current Applied Physics Vol.8 No.1
Several novel swelling mica-type clays have been synthesized by solid-state processes. Synthetic clays of ideal compositions such asNa2Si6Al2Mg 6O20F4 ÆxH2O (Na-2-mica), Na3Si5Al3Mg 6O20F4 ÆxH2O (Na-3-mica) and Na4Si4Al4Mg 6O20F4 ÆxH2O (Na-4-mica) havebeen prepared and characterized by powder X-ray diraction (XRD), scanning electron microscopy (SEM) and27Al and29Si solid-statemagic angle spinning nuclear magnetic resonance (MASNMR) spectroscopy. Powder XRD showed that all syntheses yielded water swol-len micas withc-axis spacing of. 1.2 nm except in the case of Na-2-mica which also showed a small peak of anhydrous mica phase with ac-axis spacing of 0.96 nm. Solid-state27Al MASNMR spectroscopy revealed that almost all the Al is present in the tetrahedral environ-29Si MASNMR spectroscopy revealed dierent Si (Al) nearest neighbor environments dependingupon the composition of the various micas. Selective cation exchange studies were performed on the various micas using 0.5 N NaClsolution containing 12.9 ppm Sr2+ or 8.12 ppm of La3+. The results showed, for the rst time, that Na-3-mica has a high selectivityfor the trivalent cation tested. The previously reported high selectivity of these synthetic micas for the divalent cations has been con-rmed. These selective cation exchange studies are of relevance in cation separations from drinking and waste waters.
Nagarijun Pyde Acharya,Rao Ravella Sreenivas,Rajesham Swargam,Rao Linga Venkateswar The Microbiological Society of Korea 2005 The journal of microbiology Vol.43 No.1
Lactic acid production parameter optimization using Lactobacillus amylovorus NRRL B-4542 was performed using the design of experiments (DOE) available in the form of an orthogonal array and a software for automatic design and analysis of the experiments, both based on Taguchi protocol. Optimal levels of physical parameters and key media components namely temperature, pH, inoculum size, moisture, yeast extract, $MgSO_4{\cdot}7H_20$, Tween 80, and corn steep liquor (CSL) were determined. Among the physical parameters, temperature contributed higher influence, and among media components, yeast extract, $MgSO_4{\cdot}7H_20$, and Tween 80 played important roles in the conversion of starch to lactic acid. The expected yield of lactic acid under these optimal conditions was 95.80% and the actual yield at optimum conditions was 93.50%.
Linga Venkateswar Rao,Cherukuri Pavana Jyothi,Reddy Shetty Prakasham,Chaganti Subba Rao,Ponnupalli Nageshwara Sarma,Ravella Sreenivas Rao 한국미생물학회 2006 The journal of microbiology Vol.44 No.1
Candida tropicalis was treated with ultraviolet (UV) rays, and the mutants obtained were screened for xylitol production. One of the mutants, the UV1 produced 0.81g of xylitol per gram of xylose. This was further mutated with N-methyl-N’-nitro-N-nitrosoguanidine (MNNG), and the mutants obtained were screened for xylitol production. One of the mutants (CT-OMV5) produced 0.85g/g of xylitol from xylose. Xylitol production improved to 0.87 g/g of xylose with this strain when the production medium was supplemented with urea. The CT-OMV5 mutant strain differs by 12 tests when compared to the wild-type Candida tropicalis strain. The XR activity was higher in mutant CT-OMV5. The distinct difference between the mutant and wild-type strain is the presence of numerous chlamydospores in the mutant. In this investigation, we have demonstrated that mutagenesis was successful in generating a superior xylitol-producing strain, CT-OMV5, and uncovered distinctive biochemical and physiological characteristics of the wild-type and mutant strain, CT-OMV5.