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Maturation and Spawning of Robust Tonguefish (Cynoglossus robustus (Soleidae; Teleostei)
Baeck, Gun Wook,Kim, Jae Won 한국수산학회 2004 Fisheries and Aquatic Sciences Vol.7 No.3
We examined the ovaries of 312 robust tonguefish (Cynoglossus robustus) collected each month from January to December 2001, off the coast of Yeosu, Korea.The samples were used to investigate robust tonguefish reproductive activity. Monthly changes in the gonadosomatic indexindicated that spawning peaked between June and August. Fish size at first spawning was 15-19 cm total length (TL). Over 50% of female fish 25-29 cm TL were sexually mature, and this rose to 100% for female fish 35-39 cm TL. The tonguefish spawned four or more times during the spawning season. Most females commenced spawning in their second year. The relationship between total length (cm TL) and fecundity (F) was F=528646Ln(TL)-1E+06.
Baeck, Gun-Wook,Park, Joo-Myun,Hashimoto, Hiroaki The Korean Society for Integrative Biology 2011 Animal cells and systems Vol.15 No.4
Feeding ecology was compared among the three tonguefishes Cynoglossus abbreviatus, C. joyneri and C. robustus, collected from Seto Inland Sea, Japan, from June 2000 to May 2001. They are benthivores, consuming mainly gammarid amphipods, shrimps, crabs, gastropods, bivalves and ophiuroids. C. abbreviatus consumed greater proportions of ophiuroids whereas C. joyneri and C. robustus ate more amphipods and shrimps. While C. abbreviatus consumed mostly ophiuroids in all size classes, the diets of C. joyneri and C. robustus showed ontogenetic changes in feeding habits; smaller individuals of C. joyneri and C. robustus consumed gammarid amphipods, whereas larger C. joyneri ate shrimps and gastropods, and larger C. robustus fed mainly on gastropods, crabs, bivalves and polychaetes. Cluster analysis based on diet similarities emphasized that the three Cynoglossus species could be categorized on a size-related basis into three feeding groups: smaller C. joyneri and C. rubustus (<25 cm TL) could be classified as group A, and the larger of them (>25 cm TL) as group B, whereas C. abbreviatus was categorized as group C. This means that some degree of resource partitioning can occur among the three Cynoglossus species. The seasonal changes in the diets were also significant for the three Cynoglossus species.
Baeck, Kyoung-Koo,Lee, Yoon-Sup Korean Chemical Society 1991 Bulletin of the Korean Chemical Society Vol.12 No.6
Procedures to perform reliable relativistic self-consistent-field (RSCF) calculations are described. Using light atoms and molecules, it is demonstrated that the present method always yields correct nonrelativistic limit by employing a sufficiently large value for the speed of light in RSCF calculations. Many problems associated with analytic expansions of the Dirac equations can be computationally avoided by kinetically balancing the basis sets for large and small component spinors. Results of RSCF calculations for Ne, Kr, $H_2$, and LiH indicate very small relativistic effects for these systems as expected. Trends found is these molecules, however, may be useful in understanding relativistic effects for molecules with similar valence electronic structures and heavier atoms.
Inverse DVD-R grating structured SPR sensor platform with high sensitivity and figure of merit
Baeck B. Choi,Bethy Kim,Jason Bice,Curtis Taylor,Peng Jiang 한국공업화학회 2022 Journal of Industrial and Engineering Chemistry Vol.116 No.-
The figure of merit (FOM, 1/RIU) 112.34 is achieved in the Au-covered epoxy grating (Au/Epoxy) with theinverse structure of the original track pitch DVD-R. The feasible exfoliation of the cured epoxy resin fromthe Au-covered polycarbonate (PC) gratings (Au/PC) of DVD-R grating creates a narrow deep channelstructure. As well as Au/PC, newly created Au/Epoxy gratings glow beautifully with rainbow-coloredstripes on the surface due to the constructive interference of visible light. The SEM and 3D-AFM imagesshow that the surface distortion of the Au/Epoxy grating is 0.58 (negative) and that of the Au/PC gratingis 0.14 (positive). The Au/Epoxy grating exhibits 872.01 nm/RIU with slightly lower sensitivity than theAu/PC grating (887.59 nm/RIU). However, the Au/Epoxy grating shows a total of 7.76 ± 0.53 nm with up tofull width half maximum (FWHM) for the SPR dip during the detection test, so a high FOM of 112.34 canbe achieved. In addition, the FDTD simulation shows the experimental results as well as the relevantresults of the SPR deep wavelength and FWHM. Finally, the Au/Epoxy grating shows a more pronouncedresonance for methanol concentration measurements than the Au/PC grating due to the high FOM andstrong adhesion between the Au layer and the epoxy substrate.
Baeck, S.,Han, E.,Chung, H.,Pyo, M. Elsevier Sequoia 2011 Forensic science international Vol.206 No.1
The effects of repeated hair washing and a single hair dyeing on concentrations of methamphetamine (MA) and amphetamine (AM) in hair samples of MA addicts were studied. Thirty-one MA positive hair samples collected from male (n=24, 24-51 yrs) and female abusers (n=7, 17-46 yrs) were evaluated for MA and AM concentration's changes after repeated hair washing and a single hair dyeing. Thirty-one MA positive hair samples, no additional treatment hair sample group (NAT), were treated in vitro with liquid soap or three kinds of hair dyes which were black, brown and yellow color hair dye, respectively. Quantitation of AM and MA in hair samples was utilized GC-MS using selected ion monitoring. MA and AM concentrations in NAT were 10.41+/-8.91ng/mg (range 1.50-30.0ng/mg) and 2.24+/-2.75ng/mg (range 0.41-12.90ng/mg). And, their concentrations were decreased about 23.3+/-4.5% (range 16.7-32.8%) in hair repeated washing group (WAS) and 32.6+/-4.82 (22.2-41.9) in three kinds of a single hair dyeing groups in comparison to original concentrations of MA and AM in NAT. A statistically significant difference was found between NAT and WAS or three hair dyeing groups (p<0.01), but not between WAS and three hair dyeing groups, and not between each hair dyeing groups with each three kinds of hair dyes (p>0.05).
Electronic Structure of Te/Sb/Ge and Sb/Te/Ge Multi Layer Films Using Photoelectron Spectroscopy
Baeck, Ju Heyuck,Ann, Young-kun,Jeong, Kwang-Ho,Cho, Mann-Ho,Ko, Dae-Hong,Oh, Jae-Hee,Jeong, Hongsik American Chemical Society 2009 JOURNAL OF THE AMERICAN CHEMICAL SOCIETY - Vol.131 No.38
<P>Te/Sb/Ge and Sb/Te/Ge multilayer films with an atomically controlled interface were synthesized using effusion cell and e-beam techniques. The layers interacted during the deposition, resulting in films composed of Sb-Te+Sb-Sb/Ge and Sb/Sb-Te/Ge-Te/Ge respectively. Atomic diffusion and chemical reactions in films during the annealing process were investigated by photoemission spectroscopy. In the case of Te/Sb/Ge, Ge diffused into the Sb-Te region released Sb in Sb-Te bonds and interacted with residual Te, resulting in a change in valence band line shape, which was similar to that of a Ge(1)Sb(2)Te(4) crystalline phase. The Ge-Sb-Te alloy underwent a stoichiometric change during the process, resulting in a 1.2:2:4 ratio, consistent with the most stable stoichiometry value calculated by ab initio density-functional theory. The experimental results strongly suggest that the most stable structure is generated through a reaction process involving the minimization of total energy. In addition, Ge in the Sb/Te/Ge film diffused into Sb-Te region by thermal energy. However, Ge was not able to diffuse to the near surface because Sb atoms of the high concentration at the surface were easily segregated and hindered the diffusion of other elements.</P>