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( Ivana A Cavello ),( Mariana Chesini ),( Roque A Hours ),( Sebastian F Cavalitto ) 한국미생물 · 생명공학회 2013 Journal of microbiology and biotechnology Vol.23 No.7
sequencing showed that aprECB1 can encode a prepro-type serine protease consisting of 382
( Ivana A Cavello ),( Roque A Hours ),( Sebastian F Cavalitto ) 한국미생물 · 생명공학회 2013 Journal of microbiology and biotechnology Vol.23 No.8
Enzymatic decomposition of gelatin layers on used X-ray films and repeated utilization of the enzyme for potential application in silver recovery were investigated using keratinolytic serine proteases from Purpureocillium lilacinum LPS # 876. At pH 9.0, the enzymatic reaction was enhanced by the increase of enzyme concentration or by the increase of the temperature up to 60oC. Under the conditions of 6.9 U/ml, 60oC, and pH 9.0, hydrolysis of the gelatin layers and the resulting release of silver particles were achieved within 6 min. The protective effect of polyols against thermal denaturation was investigated. The presence of glycerol and propylene glycol increased enzyme stability. When the reusability of the enzyme for gelatin hydrolysis was tested, it could be seen that it could be effectively reused for more cycles when glycerol was added, compared with the enzyme without protective agents. The results of these repeated treatments suggested that a continuous process of recycling silver from used X-ray is feasible. Keeping in mind that recycling is (at the present time) needed and imperative, it can be remarked that, in this research, three wastes were successfully used: hair waste in order to produce serine proteases; glycerol in order to enhance enzyme thermal stability; and used Xray films in order to recover silver and PET films.
Patterns of cellular phone use among young people in 12 countries: Implications for RF exposure
Langer, Chelsea E.,de Llobet, Patricia,Dalmau, Albert,Wiart, Joe,Goedhart, Geertje,Hours, Martine,Benke, Geza P.,Bouka, Evdoxia,Bruchim, Revital,Choi, Kyung-Hwa,Eng, Amanda,Ha, Mina,Karalexi, Maria,Ki Elsevier 2017 Environment international Vol.107 No.-
<P><B>Abstract</B></P> <P>Characterizing exposure to radiofrequency (RF) fields from wireless telecommunications technologies during childhood and adolescence is a research priority in investigating the health effects of RF. The Mobi-Expo study aimed to describe characteristics and determinants of cellular phone use in 534 young people (10–24years) in 12 countries. The study used a specifically designed software application installed on smartphones to collect data on the use of wireless telecommunications devices within this age group. The role of gender, age, maternal education, calendar period, and country was evaluated through multivariate models mutually adjusting for all variables. Call number and duration were higher among females compared to males (geometric mean (GM) ratio 1.17 and 1.42, respectively), among 20–24year olds compared to 10–14year olds (GM ratio 2.09 and 4.40, respectively), and among lowest compared to highest social classes (GM ratio 1.52 and 1.58, respectively). The number of SMS was higher in females (GM ratio 1.46) and the middle age group (15–19year olds: GM ratio 2.21 compared to 10–14year olds) and decreased over time. Data use was highest in the oldest age group, whereas Wi-Fi use was highest in the middle age group. Both data and Wi-Fi use increased over time. Large differences in the number and duration of calls, SMS, and data/Wi-Fi use were seen by country, with country and age accounting for up to 50% of the variance. Hands-free and laterality of use did not show significant differences by sex, age, education, study period, or country. Although limited by a convenience sample, these results provide valuable insights to the design, analysis, and interpretation of future epidemiological studies concerning the health effects of exposure resulting from cellular phone use in young people. In addition, the information provided by this research may be used to design strategies to minimize RF exposure.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Number and duration of calls varied by sex, age range, and socioeconomic status </LI> <LI> Laterality and hands-free use were less influenced by user characteristics </LI> <LI> Country of origin explained most of the variance in number and duration of calls, as well as SMS and data/Wi-Fi </LI> </UL> </P>
( Cecilia Perez-cruz ),( Carlos N. Cano-gonzalez ),( Jose Fuentes ),( Nagamani Balagurusamy ),( Carolina E. Vita ),( Roque A. Hours ),( Cristobal N. Aguilar ),( Sebastian F. Cavalitto ),( Juan C. Cont 한국키틴키토산학회 2018 한국키틴키토산학회지 Vol.23 No.3
Aspergillus niger biomass, an industrial by-product of citric acid fermentation is an emergent source of glycoderivatives with applications in biofuel, cosmetics, feed, energy, food, medicine, and nanotechnology. In this study, the effect of purified neutral protease for deprotenization of fungal biomass studied at various levels (0, 5, 10, 20 and 40 U/100 mg of biomass) and the saccharification of fungal biomass was evaluated with amylolytic enzymes and chitosanases. The efficiency of deproteinization of fungal biomass was based on the enzyme concentration and contact time. Protease at a concentration of 20 U/100 mg of dry biomass and with a contact time of 8 h achieved 30% final deproteinization. No effect on saccharification of A. niger biomass was observed by treatment with purified amylolytic enzymes. Meanwhile, the endo- and exo-chitosanases treatment yielded 54 g of g reducing sugars (equivalent to amino sugars)/ kg of fungal biomass, which can be employed for tailor-made carbohydrate production.
Extraction of Pectinesterase from Jalapeno Chili Pepper (Capsicum annuum) and Its Thermal Stability
Sonia Marisela Mejia-Cordova,Julio Cesar Montanez,Cristobal Noe Aguilar,Maria de la Luz Reyes-Vega,Heliodoro de la Garza,Roque Alberto Hours,Juan Carlos Contreras-Esquivel 한국식품과학회 2005 Food Science and Biotechnology Vol.14 No.2
스테인레스鋼纖維로 康化된 알루미늄과 알루미늄合金複合材의 界面反應에 對한 硏究
許在根 서울産業大學校 1986 논문집 Vol.24 No.1
This study is based on the reaction of the interface between stainless steel fiber and aluminum to which specific elements were added. In this investigation aluminum and aluminum alloy which had been reinforced which stainless steel fiber was made by the method of liquid infiltration. The components that had been formed between them were confirmed by X-ray and EPMA, also the thickness of each layer was measured by a optical microscope. As the influence of te specific elements when the composite material was made, cobalt was added to the interface. On the other hand the other elements didn't add themselves to interface, but added Cr., Ni to interface. In microscopic examination the thickness each interface didn't change and the diameter of the fiber became shorter. Most of the composite material had been higher strength than theoretical one, which establishes face that the interface cohesion is good when the composite meterials are made. In the hardness test of the composite material we could find that their interface is harder than the fiber or the matrix is, which establishes that the intermetallic compound can be formed by the sufficient reaction of the fiber and the matrix.
許在根 서울産業大學校 1982 논문집 Vol.17 No.1
Recently high Strength Steel has been produced in Korea, This study aims aat a research on the mechanical characteristic and microscopic structure of the weld zone of the high strength steel when welding it by means of a lowhydrogen-type welding rod. Some of the signiticant findings are:tensile strength in weld zone by 10kg/㎟ more than basemetal:L-260(60㎏/㎟ type welding rod) was Superior to L-200(50㎏/㎟ type welding rod) in terms of its strength: hardness value increased more in weld zone than in basemetals in particular hardness value in heat effected zone was the highest: impact value increased in weld zone about 2 or 3㎏-m more than in base metal: the microscopic structure of weld zone was finer than that of base metal. On the basis of thesefacts, this study concluded: the weld Zone of the high strength steel produced in korea increased in its tencile strength, yield strength, hardness Value, and impact value than base metal: the microsopic structure of the weld zone of the high strength steel is finer than that of base metal. Therefore, in case of using the high strength steel for making a structure three important factors should be attended to in its constrution: first the choise of a welding rod: Second the size of weld zone (X and Y direction) third, the structure of weld zone.
鍍金에서 Iron-Nickel 二元合金의 電着에 關한 硏究
許在根 서울産業大學校 1981 논문집 Vol.15 No.1
In the Fe-Ni alloy plating, Fe and Ni are dissolved in the plating Solution. In the plating solution ferrous iron tend to ferric iron in the atmosphere or plating process. In the case of the ferric iron, it is very difficult to acquire good plating surface because that ferric iron not only precipitate in the plating solution but makes rough sulface. Therefore, in this procedure, Reducing from ferric iron to ferrous iron for the preventing ferrous iron deposit by adding Reducing agents and stabilizers. This study has done by using the Reducing agents associated with the effect on the precipitation and plating conditions. 1. The most suitable reducing agents was tartaric Acid and citric Acid. 2. composition of the associated with increasing temperature was decreased amount of iron and little effected. 3. In the case of adding reducing agents was decreased the amount of iron in the dectrodeosite than not adding. 4. Amount of deposit with very of pH tend to a little decreased at low pH but high pH Precipitated to scarcely similar state.
許在根 서울産業大學校 1983 논문집 Vol.19 No.1
Some Hadfield Steels with 1%Si 2% Al 0.8% Mo 4% Cr were studied mainly by micrography on isothermal carbide Precipitation after Solution treatment. Isothermal Precipitation diagrams for all steels were determined as c-carve fundamentally similar to that of standard Hadfield steel. By addition of 1%Si, the carbide Precipitation in steel was little affected, But the temperature range in which pearlitic constituent(PC) appeared was slightly extended. By addition of 2% Al, the grain boundary carbide precipitation in high temperature rang was accelerated, but the tramstormation in ti PC was retarded and its temperature range was limited in a Slightly narrow range. Moreover, matrix precipitation of carbide in high temperature range was disturbed remarkably by addition of Al. By addition of carbide forming elements such as Mo and Cr the precipitation of carbide was accelerated especially in high temperature range, and the precipitation temperature range was extended to higher temperature.