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1978年度 秋季硏究發表論文 要旨錄: 1. Recent Advances in the Study of Oogenesis
King, Robert C. The Korean Society for Integrative Biology 1979 동물학회지 Vol.22 No.1
In recent years some very substantial advances have been made in our understanding of oogenesis as a result of studies on a relatively few, very diverse species of animals. In this lecture I will (1) outline normal oogenesis using an advanced insect, Drosophila melanogaster, as an example, (2) show how oogenesis can be dissected genetically by studying the ovarian pathologies of flies homozygous for various recessive, female sterile genes, and (3) discuss how estimates can be made of the fraction of the Drosophila genome devoted to oogenesis. Then I will describe studies on mutations that block vitello-genesis in Drosophila and indicate what they tell us about inter actions between the ovary, the fat body and the endocrine system. I will next discuss the evolutionary mechanisms that have been adopted in higher insects and amphibians to produce the prodigious quantities of ribosomes stored in oocytes. I will end with an account of the results of recent stuides on amphibian lampbrush chromosomes which show how messenger RNAs are transcribed during oogenesis.
Study of α-, γ-, and δ-Tocopherols in the Oxidative Stability of Lard
Robert E. King,David B. Min,민세철 한국식품과학회 2011 Food Science and Biotechnology Vol.20 No.3
Effects of α-, γ-, and δ-tocopherols at 0, 50,100, 250, 500, and 1,000 ppm on the oxidative stability of lard during storage in the dark at 55oC for 7 days were studied by determining headspace oxygen content and peroxide value. The headspace oxygen content of the lard without tocopherol addition decreased from 21.1 to 14.4%and the peroxide value increased from 2.5 to 15.4 meq/kg lard for 7 days. The headspace oxygen depletion and the peroxide value of lard decreased by the addition of α-tocopherol at 50 ppm, but significantly increased at 250,500, or 1,000 ppm. As the concentration of γ-tocopherol or δ-tocopherol increased, the headspace oxygen depletion and the peroxide value decreased. α-Tocopherol at 250ppm acted as a prooxidant in the autoxidation of lard. The concentrations of γ- or δ-tocopherol to be applied to improve the autoxidative stability of lard may be 100-250ppm.
Robert King,Hyung Ok Lee,David B. Min 한국식품과학회 2009 Food Science and Biotechnology Vol.18 No.2
Quenching mechanisms and kinetics of α-, β-, γ-, and δ-tocopherol in photosensitized oxidation of lard were studied. Lard at 0.03, 0.07, 0.11, and 0.3 M in methylene chloride containing 4.4×10?? M chlorophyll and 0, 0.1, 0.3, and 0.6 mM α-, β-, γ-, and δ-tocopherol were stored under light for 4 hr, respectively. Oxidation was determined by headspace oxygen and peroxide value. Tocopherols prevented the photosensitized oxidation of lard (p<0.05). Steady state kinetic study showed that α-, β-, γ-, and δ-tocopherol prevented the photosensitized oxidation of lard by quenching singlet oxygen. Singlet oxygen quenching rates of α-, β-, γ-, and δ-tocopherol by headspace oxygen depletion were 1.86, 2.39, 2.47, and 2.11×10?/M/sec, respectively. The quenching rates of α-, β-, γ-, and δ-tocopherol by peroxide value were 1.42, 1.11, 0.97, and 0.42×10?/M/sec, respectively. The quenching rates of tocopherols were slightly different depending on the measurements of oxidation.
Interaction of Rare Earth Chloride Salts to Alumina and Mullite in LiCl-KCl at 773 K
Horvath, David,Warmann, Stephen,King, James,Marsden, Kenneth,Hoover, Robert Korean Radioactive Waste Society 2020 방사성폐기물학회지 Vol.18 No.3
Two commonly used ceramics in molten salt research are alumina and mullite. The two ceramics were exposed to a combination of rare earth chlorides (YCl<sub>3</sub>, SmCl<sub>3</sub>, NdCl<sub>3</sub>, PrCl<sub>3</sub>, and CeCl<sub>3</sub>; each rare earth chloride of 1.8 weight percent) in LiCl-KCl at 773 K for approximately 13 days. Scanning electron microscopy with wave dispersion spectra was utilized to investigate a formation layer or deposition of rare earths onto the ceramic. Only the major constituents of the ceramics (Al, Si, and O<sub>2</sub>) were observed during the wave dispersion spectra. X-ray fluorescence was used as well to determine concentration changes in the molten salt as a function of ceramic exposure time. This study shows no evidence of ionic exchange or layer formation between the ceramics and molten chloride salt mixture. There are signs of surface tension effects of molten salt moving out of the tantalum crucible into secondary containment.
Transmuted new generalized Weibull distribution for lifetime modeling
Khan, Muhammad Shuaib,King, Robert,Hudson, Irene Lena The Korean Statistical Society 2016 Communications for statistical applications and me Vol.23 No.5
The Weibull family of lifetime distributions play a fundamental role in reliability engineering and life testing problems. This paper investigates the potential usefulness of transmuted new generalized Weibull (TNGW) distribution for modeling lifetime data. This distribution is an important competitive model that contains twenty-three lifetime distributions as special cases. We can obtain the TNGW distribution using the quadratic rank transmutation map (QRTM) technique. We derive the analytical shapes of the density and hazard functions for graphical illustrations. In addition, we explore some mathematical properties of the TNGW model including expressions for the quantile function, moments, entropies, mean deviation, Bonferroni and Lorenz curves and the moments of order statistics. The method of maximum likelihood is used to estimate the model parameters. Finally the applicability of the TNGW model is presented using nicotine in cigarettes data for illustration.
New generalized inverse Weibull distribution for lifetime modeling
Khan, Muhammad Shuaib,King, Robert The Korean Statistical Society 2016 Communications for statistical applications and me Vol.23 No.2
This paper introduces the four parameter new generalized inverse Weibull distribution and investigates the potential usefulness of this model with application to reliability data from engineering studies. The new extended model has upside-down hazard rate function and provides an alternative to existing lifetime distributions. Various structural properties of the new distribution are derived that include explicit expressions for the moments, moment generating function, quantile function and the moments of order statistics. The estimation of model parameters are performed by the method of maximum likelihood and evaluate the performance of maximum likelihood estimation using simulation.
Experimental Observations for Anode Optimization of Oxide Reduction Equipment
David Horvath,James King,Robert Hoover,Steve Warmann,Ken Marsden,윤달성,Steven Herrmann 한국방사성폐기물학회 2022 방사성폐기물학회지 Vol.20 No.4
The electrochemical behavior was investigated during the electrolysis of nickel oxide in LiCl-Li2O salt mixture at 650℃ by changing several components. The focus of this work is to improve anode design and shroud design to increase current densities. The tested components were ceramic anode shroud porosity, porosity size, anode geometry, anode material, and metallic porous anode shroud. The goal of these experiments was to optimize and improve the reduction process. The highest contributors to higher current densities were anode shroud porosity and anode geometry.
Kevin A. Hao,Robert J. Cueto,Christel Gharby,David Freeman,Joseph J. King,Thomas W. Wright,Diana Almader-Douglas,Bradley S. Schoch,Jean-David Werthel 대한견주관절학회 2024 대한견주관절의학회지 Vol.27 No.1
Background: Restoration of external (ER) and internal rotation (IR) after Grammont-style reverse shoulder arthroplasty (RSA) is often unreliable. The purpose of this systematic review was to evaluate the influence of RSA medio-lateral offset and subscapularis repair on axial rotation after RSA. Methods: We conducted a systematic review of studies evaluating axial rotation (ER, IR, or both) after RSA with a defined implant design. Medio-lateral implant classification was adopted from Werthel et al. Meta-analysis was conducted using a random-effects model. Results: Thirty-two studies reporting 2,233 RSAs were included (mean patient age, 72.5 years; follow-up, 43 months; 64% female). The subscapularis was repaired in 91% (n=2,032) of shoulders and did not differ based on global implant lateralization (91% for both, P=0.602). On meta-analysis, globally lateralized implants achieved greater postoperative ER (40° [36°–44°] vs. 27° [22°–32°], P<0.001) and postoperative improvement in ER (20° [15°–26°] vs. 10° [5°–15°], P<0.001). Lateralized implants with subscapularis repair or medialized implants without subscapularis repair had significantly greater postoperative ER and postoperative improvement in ER compared to globally medialized implants with subscapularis repair (P<0.001 for both). Mean postoperative IR was reported in 56% (n=18) of studies and achieved the minimum necessary IR in 51% of lateralized (n=325, 5 cohorts) versus 36% (n=177, 5 cohorts) of medialized implants. Conclusions: Lateralized RSA produces superior axial rotation compared to medialized RSA. Lateralized RSA with subscapularis repair and medialized RSA without subscapularis repair provide greater axial rotation compared to medialized RSA with subscapularis repair. Level of evidence: 2A.