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김경진,김형석,이호근 慶熙大學校 地球環境硏究所 1998 지구환경논문집 Vol.9 No.-
The environment of the earth has been changed worse by human activities. There are lots of waterborne diseases which are caused by bacteria, virus, and protozoan. Microorganisms pose a serious threat to the safety of the world's drinking water. At least 25 millon people in the world die because of the waterborne diseases. The major symptoms are diarriah, vomite, stomach pain, and headache. Some diseases kill patients who are especially immuno compromised such as cholera, typhoid, etc. Many cases of this kind of diseases are the important issue throughout the world. Therefore international academic conferences are holding frequently. One of the recommentation was announced in Guayaquil, Ecuador in 1995, which is related with control of waterborne diseases. We know that water pollution by E.coli indicate fecal contamination in water system. We are drinking about 2 liters of drinking water every day. There are several kinds of drinkind water, e.g., tap water, bottled water, purifier passed water, groundwater, etc. The city tap water is most widely using drinking water source. But owing to the corrosion of water supplying pipe lines and storage tank contamination in buildings, the tap water quality has some problems of bacteria and other contaminants. Throughout the world, water purifiers are using in many countries, but there are few reports on bacteria behavior in water purifiers. Authors studied the bacteria reduction and removal effects through activated carbon and UV lamp in water purifier, and got some interesting results.
( Ju Hyoung Lim ),( Ho-gun Rhie ),( Jeong Nam Kim ) 한국미생물생명공학회(구 한국산업미생물학회) 2018 Journal of microbiology and biotechnology Vol.28 No.7
Pseudomonas fluorescens KLR101 was found to be capable of producing polyhydroxyalkanoate (PHA) using various sugars and fatty acids with carbon numbers ranging from 2 to 6. The PHA granules consisted mainly of a poly(3-hydroxybutyrate) homopolymer and/or poly(3- hydroxybutyrate-co-3-hydroxyvalerate) copolymer. Genomic DNA of P. fluorescens was fractionated and cloned into a lambda library, in which a 5.8-kb fragment that hybridized to a heterologous phaC probe from Ralstonia eutropha was identified. In vivo expression in Klebsiella aerogenes KC2671 (pUMS), restriction mapping, Southern hybridization experiments, and sequencing data revealed that PHA biosynthesis by P. fluorescens relied upon a polypeptide encoded by a 1,683-bp non-operonal ORF, which was preceded by a possible -24/-12 promoter and highly similar to DNA sequences of a gene encoding PHA synthase in the genus Pseudomonas. In vivo expression of the putative PHA synthase gene (phaC<sub>Pf</sub>) in a recombinant Escherichia coli strain was investigated by using glucose and decanoate as substrates. E. coli (phaC<sub>Pf</sub> <sup>+</sup>, pUMS) grown in medium containing glucose accumulated PHA granules consisting mainly of 3-hydroxybutyrate, whereas only a trace amount of 3-hydroxydecanoate was detected from an E. coli fadR mutant (phaC<sub>Pf</sub> <sup>+</sup>) grown in medium containing decanoate. In vitro enzymatic assessment experiments showed that 3-hydroxybutyryl-CoA was efficiently used as a substrate of purified PhaC<sub>Pf</sub>, suggesting that the putative PHA synthase of P. fluorescens utilizes mainly short-chain-length PHA precursors as a substrate.