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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
> Journal Vol & Issue
Microbiology and Biotechnology Letters
Journal Basic Information
Journal DOI :
The Korean Society for Applied Microbiology and Biotechnology
Editor in Chief :
Volume & Issues
Volume 7, Issue 4 - Dec 1979
Volume 7, Issue 3 - Sep 1979
Volume 7, Issue 2 - Jun 1979
Volume 7, Issue 1 - Mar 1979
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Studies on the Fermentative Production of Inosine-5′-monophosphate by Microorganisms (Part 1) Derivation of 5′-IMP Producing Mutants from Brevibacterium ammoniagenes
Microbiology and Biotechnology Letters, volume 7, issue 3, 1979, Pages 119~125
As the first step of domestic developmint of the nucleic acid-related compounds, purine base required auxotrophs from Brevibacterium ammoniagenes ATCC 6872 were derived by the ultraviolet irradiation or the treatment of N-methyl-N'-nitro-N-nitroso guanidine (NTG), diethyl sulfate (DES), and ethylme-thyl sulfate (EMS). The optimum conditions of mutation by means of several mutagens were induced respectively. The yield of mutants was 0.083％ by the ultraviolet irradiation, 0.67％ by the NTG treatment, 1.1％ by the DES treatment, and 0.45％ by the EMS treatment. Six strains among 239 auxotrophs were screened out to accumulate 5'-lMP in the culture broth. Cry-stalline 5'-lMP was isolated from the culture broth of Brevifbacterium ammoniagenes adnine-guanine less mutant D-21530 by the use of anion exchange resin, Amberlite IRA-402, and it was identified physically and chemically as 5'-inosinic acid.
Studies on the Fermentative Production of Guanosine -5′-monophosphate by Microorganism (Part 1) Derivation of XMP-aminase Producing Mutants
Microbiology and Biotechnology Letters, volume 7, issue 3, 1979, Pages 127~133
By the treatment of several mutagens, a number of 5'-guanylic acid producing mutants from 5'-xan-thylic acid were obtained from Brevibacterium ammoniagenes ATCC 6871. The indispensensable genetic-characters of the mutants were adenine requirement, lack of GMP-reductase and mutation to adenosine resistance from adenosine sensitiveness. Main product from 5'-xanthylic acirl by strain BA-17-2 was 5'-guanulic acid, and was isolated in a crystalline form by the use of anion exchange resin, Duolite 102 D. The isolated crystalline was identified as 5'-guanylic acid by means of paper chromatography, ultrav-iolet absorption spectra, and infrared absorption spectrum.
Prodution and Properties of the Insoluble Penicillinase from Streptomyces
Microbiology and Biotechnology Letters, volume 7, issue 3, 1979, Pages 135~140
A Streptomyces sp. strain AS-727 which was capable of producing penicillinase, was isolated from soil. The enzyme production was affected by the carbon and nitrogen sources added. Among them so far tested, glucose (or maltose) and sodium nitrate increased the enzyme production. And the amount of enzyme prodced reached maximum in 4 days cultivation. The optimla pH and temperature of the penicillinase was between pH 6.0 to 8.0 and 4
respectively. The stabel pH range of the enzyme was stable at 4
, but it lost about 30％ and 40％ of the the activity respectively when it was treated at 6
for 60 minutes. The activity of the enzyme was inhibited by Z
, but A
did not affected enzyme activity. Peculiarly, the enzyme protein precipitated by freezing or addition of ammonium sulfate, urea, sodium chloride and some organic solvents as etanol, methanol, acetone was not dissolved in deionized water or any buffer solution.n.n.ion.n.n.
Studies on Naringinase Produced from Aspergillus nidulans (Part 4) Immobilization of Naringinase on DEAE-Sephadex A-25
Microbiology and Biotechnology Letters, volume 7, issue 3, 1979, Pages 141~147
Naringinase from Atpergillus nidulans was immobillized on DEAE-Sephadex A-25 and its characteristics were studied. The optimal conditions for the preparation of the immobilized enzyme were as follow; optimal pH, incubation time and the suitable amount of enzyme were 6.0, 30 min. and 110 units per gram of the dried ion exchage resin, respectively. The optimal pH of the immobilized enzyme was higher than that of the native enzyme. The optimal temperature increased from 4
. The heat and pH stability of the immobillized enzyme were better than those of the native enzyme. No significant difference in the Michaelis constant was detected. Activation energy of the immobilized enzyme was 7.96 Kcal/mole, and the apparent Michaelis rate equation was used to describe the action of this material. The degree of hydrolysis was dependant on the flow rate at low rate of perfusion through the column. As the flow rate increased, the value of the apparent Km decreased.
Purification and Properties of an Extracellular Chitinase from Streptomyces sp.
Hong, Yong-Ki ; Seu, Jung-Hwn ;
Microbiology and Biotechnology Letters, volume 7, issue 3, 1979, Pages 149~155
Streptomyces sp. 115-5 was selected as the most active microorganism of about 200 strains for the production of chitinase. The enzyme was purified by (NH
treatment, 1st-Sephadex G-100, DEAE-Cellulose, 2nd-Sephadex G-100 column chromatography, and evidence for homogenity was obtained from CM-Sephadex C-50 column chromatography and polyacylamide gel electrophoresis. The purified enzyme hydrolyzed chitin (N-acetyl glucosamine polymer) and chitosan (glucosamine polymer) but not cellulose. And with chitin as the substrate, a Km value of 3.6 mg of chitin per ml and a Vmax of 100
mo1e fer hr were found. The activation of the chitinase was 3.66 kcal per mole. The molecular weight of the enzyme was esti-mated about 56,000 daltons by Sephadex G-100 chromatography and isoelectric point as pH 3.0.
Studies on the Proteolytic Enzyme of Mold (Part 1) Production of Acid Protease by Aspergillus awamori U-3 and Characteristics of Enzyme
Microbiology and Biotechnology Letters, volume 7, issue 3, 1979, Pages 157~164
These experiments were performed to investigate the culture condition, characteristic of crude enzyme and the heat resistance of the acid protease by Aspergillus awamori U-3. The results obtained were as follows: 1. The optimum culture temperature and time on wheat bran medium and defatted rice bran medium were 3
and 72 hrs, respectively. The optimum amount of added water was 100~120 ％ on wheat bran medium and 100~130 ％ on de-fatted rice bran medium. 2. Of the these various ingredients, addition of KN
, glutamic acid and glucose on wheat bran medium and addition Of KN
, glucose, lactose, K
on defatted rice bran medium were very effective. On wheat bran medium, concentration of addition of glucose, KN
and glutamic acid were 3.0~4.0％, 0.2~0.4 ％ and 1.0％, respectively. 3. The optimum pH for the enzyme action was 2.4 ％, the optimum temperature about 45
and the stable pH range 2.0~5.0, The enzyme was stable below 5
and was inactivated rapidly above 5
. 4. The addition of CaC
as the heat resistance agents showed the slight resistance. 5. When the enzyme solution added with the heat resistance agents (CaC1
) was heated for 10-30 minutes at 6
, their remaining activities were decreased largely above 20 minutes and The heat resistance effects of CaC
were not observed almost at 8
Detection of the Recovery Substance for Cell Divison in UV-Irradiated Escherichia coli B -Stabilization of the Active Substance by Magnesium-
Song, Bang-Ho ;
Microbiology and Biotechnology Letters, volume 7, issue 3, 1979, Pages 165~173
Recovery component for cell division in UV-irradiated E. coli B was detected with use of the cell extract of E. coli B/r which is a resistant mutant of E. coli B against UV-irradiation. The active substance was non-dialyzable and increased the activity by adding B-NAD remarkably. One more factor for increasing or promoting the restoration recognized was magnesium. Magnesium was effective to stabilze the substance in procedure of isolation. Two active substances were obtained from sucrose gradient centrifugation. One of them was recovred from the botton area and the other from top area just below below surface. the former was not stabilized by magnesium, while the latter stabilized the activity by it remarkably. The former which did not require magnesium was insensitive to protease and the latter which required magnesium was sensitive to it. Both were insensitive to RNase and DNase. Recovery ratio was doubled by using nitrogen gas than aeration in purification process. DNA-ligase less mutant was revealed same activity on it's recovery ratio with the parent strain of E. coli K-12. The active substance stimulating the filament cell may exist as a complex which is inactivated easily in the dissociated state ana requrie B-NAD or magnesium.
A Study on Bacterial Flora Inhibiting in Crassostrea gigas and Its Living Environments.
Microbiology and Biotechnology Letters, volume 7, issue 3, 1979, Pages 175~179
The present work was conducted in order to survey bacterial flora inhabiting in Crassostrea gigas. The Crassostrea gigas, sea water and mud of its living environments were sampled at Goseong bay, Gyungnam and Dolsan, Yeochon-gun, Chungnam at the period of from December 1978 to February 1979. The obtained results are summarized as follows: 1. The range of bacterial counts found in Crassostrea gigas, sea water and mud was respectively 10
. 2. Among the bacterial 382 strains isolated from the those sample sources, Vibrio genus was 43.5％, Pseudomonas 16.7％, Moraxella 11.5％ and Flavobacterium-cytophaga 8.9％. 3. Among 173 strains classified as Vibrio genus, 56％ of them was found in Crassostrea gigas, 54％ in mud and 25％ in sea water. 4. Pseudomonas type I was found only in sea water and type III/IV found in sea water, mud and Crassostrea gigas. Especially type III/IV was found much in sea water.