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곤쟁이,Archaeomysis kokuboi의 개체군 구조와 세대분석
마채우 순천향대학교 기초과학연구소 2001 순천향자연과학연구 논문집 Vol.7 No.1
Archaeomysis kokuboi Ii, 1964 is a benthic mysid inhabiting the nearshore area from the swash zone to the surf zone of sand beaches. The population stricture and generation analysis of A. kokuboi was investigated in Songjeong Beach, Korea. The occurrence of ovigerous females showed a pattern of three breeding peaks, representing three generations; The overwintering generation, Spring generation and Summer generation. Size frequency distribution represented the monthly reproductive phenomena such as breeding seasons, and relative abundance of the developmental stage. Each generation was different in breeding period, size of the ovigerous females and life span. The life span of individuals depended on the seasonal changes in sea water temperature. The overwintering generation had a life span of 8 months, and the spring and the summer generation had a life span of 5 months.
곤쟁이,Archaeomysis kokuboi의 초기성장에 관한연구
마채우 순천향대학교 기초과학연구소 2001 순천향자연과학연구 논문집 Vol.7 No.1
The life history of A. kokuboi was investigated in Songjeong Beach, Korea. The growth was analysed in terms of intermolt period, percentage increment and growth rate based on laboratory rearing. Under the given temperature regimes, the intermolt period of the juveniles increased with all developmental stages except the first. In all cases, the intermolt period of the first stage was longer than that of the second stage. Intermolt periods varied with the rearing temperatures. Mean intermolt periods were 18 days, 5 days, and 3 days in 10℃, 18℃, and 25℃, respectively. Sexual characters appear in the 3rd-4th juvenile stages, and the 7th stage has a marsupium in female and a penis in male. Appearance of sexual characters is determined neither by the size of individuals nor by the cumulative intermolt period of the individuals. It is noted that the onset of sexual differentiation and sexual maturity depends on the number of moltings. The daily growth rate of A. kokuboi was inversely proportional to rearing temperature. The growth rate of A. kokuboi at 10℃, 18℃. and 25℃ was 0.008mm/day, 0.029mm/day, and 0.043mm/day, respectively.
해양에서 분리한 Lantobacillus sp. JK-8에 의한 질병원인 세균의 살균효과
천재우,마채우,오계헌 순천향대학교 기초과학연구소 2004 순천향자연과학연구 논문집 Vol.10 No.2
The purpose of this work was to investigate for killing effect of disease-causing bacteria by Lactobacillus sp. JK-8 isolated from marine environment. Initially, a bacterial culture, strain JK-8 was developed to grow no MRS media. The bacterium was identified as genus Lactobacillus on the basis of BIOLOG test, and designated as Lactobacillus sp. JK-8. The intial pH 7 of the cultures became to decrease pH 3.85 at the end of incubaction according to the growth of Lactobacillus sp. JK-8. The antibacterial activity using plate diffusion method against target bacteria was determined with 5-fold concentrate of cell-free culture supernatant. Excellent killing effect of target bacteria was achieved. The inhibition zone obtained with culture supernatant were in between 14 mm and 20 mm. Killing rate of pathogenic bacteria was examined with cell-free concentrated supernatants. All bacteria tested in this work completely killed within 3 hrs of incubaction.
Marsupial Development and Molt Cycle of Archaeomysis kokuboi : Crustacea:Mysidacea
Ma, Chae Woo,Hong, Sung Yun,Jo, Soo Gun 한국수산학회 2002 Fisheries and Aquatic Sciences Vol.5 No.4
Ovarian cycle, marsupial development and molt cycle of Archaeomysis kokuboi were studied to understand these processes as a whole event. Based on morphological characters the marsupial development is divided into 3 stages, Embryonic stage (duration time of 4 days), Nauplioid stage (5 days) and Postnauplioid stage (4 days). Morphological description was made for the 3 stages, and each stage was examined in relation to the corresponding stages of ovarian cycle and molt cycle.
Ma, Haiqing,Mahadik, Mahadeo A.,Park, Jin Woo,Kumar, Manish,Chung, Hee Suk,Chae, Weon Sik,Kong, Gi Won,Lee, Hyun Hwi,Choi, Sun Hee,Jang, Jum Suk The Royal Society of Chemistry 2018 Nanoscale Vol.10 No.47
<P>In this study, we present an advanced strategy of low-temperature hydrogen annealing combined with high- temperature quenching in air for activating α-Fe2O3 nanorod photoanodes to boost the photoelectrochemical performance. We report that various low-temperature annealing conditions (340, 360, 380, and 400 °C) under hydrogen gas flow convert β-FeOOH into magnetite (Fe3O4) as well as introduce Sn<SUP>4+</SUP> diffusion from FTO substrates to its surface. Furthermore, high-temperature quenching (800 °C) resulted in the phase change of magnetite (Fe3O4) into hematite (α-Fe2O3) and self Sn<SUP>4+</SUP> doping into the hematite lattice. Thus, the hydrogen-assisted thermally activated hematite photoanode achieved a photocurrent density of 1.35 mA cm<SUP>−2</SUP> at 1.23 V <I>vs.</I> RHE and 1.91 mA cm<SUP>−2</SUP> at 1.4 V <I>vs.</I> RHE, which is 70% and 80% higher than that of directly quenched hematite at 800 °C. These combined two step strategies provide new insight into high Sn-self doping for α-Fe2O3 photoanodes and allow for further development of more efficient solar water oxidation systems.</P>
Back, Hyun-moon,Song, Byungjeong,Chae, Jung-woo,Yun, Hwi-yeol,Ma, Jin Yeul,Kwon, Kwang-il Hindawi Publishing Corporation 2015 Journal of analytical methods in chemistry Vol.2015 No.-
<P>KIOM-MA128 is a novel Korean herbal medicine with antiatopic, anti-inflammatory, and antiasthmatic effects. Matrine is thought to be a potential chemical marker of KIOM-MA128, but pharmacokinetic studies on KIOM-MA128 had not been performed. This study describes a simple and rapid method using high-performance liquid chromatography-tandem mass spectrometry (HPLC-MS/MS) to determine the concentration of matrine in rats plasma after administration of KIOM-MA128. The isocratic mobile phase consisted of methanol and distilled water, and the flow rate was 0.15 mL/min. The accuracy and precision of the assay, as well as stability tests, were performed in accordance with FDA regulations for the validation of bioanalytical methods. The half-life and <I>T</I><SUB>max</SUB> of matrine after administration of KIOM-MA128 were 4.29 ± 2.20 h and 1.8 ± 1.23 h, respectively. <I>C</I><SUB>max</SUB> and AUC<SUB>inf</SUB> of matrine after administration of KIOM-MA128 at 4 g/kg and 8 g/kg were 595.10 ± 182.91 ng/mL, 5336.77 ± 1503.84 ng/mL·h and 850.46 ± 120 ng/mL, 9583.10 ± 888.92 ng/mL·h, respectively. The validated method was successfully applied to a pharmacokinetic study in rats after oral administration of KIOM-MA128.</P>