Transactions on Electrical and Electronic Materials
/
v.5
no.2
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pp.66-70
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2004
The Sr$\_$0.7/Bi$\_$2.3/Ta$_2$O$\_$9/(SBT)thin films are deposited on Pt-coated electrode (Pt/TiO$_2$/SiO$_2$/Si) using a RE magnetron sputtering method. The ferroelectric properties of SBT capacitors with annealing times were studied. As a result of conducting the X-ray diffraction analysis and the electron microscopy analysis, the perovskite phase began to grow from 10 minutes after annealing the specimen, and excellent crystallization was accomplished at 60 minutes after annealing the specimen. The remanet polarization (2P$\_$r/) value and the coercive electric field (E$\_$c/) of the SBT thin film specimen showed the most excellent characteristics at 60 minutes after annealing the specimen, which were approximately 12.40 C/$\textrm{cm}^2$ and 30 kV/cm, respectively. The leakage current density of the SBT thin film specimen as annealed for 60 minutes was approximately 2.81${\times}$10$\^$-9/A/$\textrm{cm}^2$.
Ganbold, Onolragchaa;Manjula, Prabuddha;Lee, Seung-Hwan;Paek, Woon Kee;Seo, Dongwon;Munkhbayar, Munkhbaatar;Lee, Jun Heon
Asian-Australasian Journal of Animal Sciences
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v.32
no.7
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pp.939-948
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2019
Objective: Extension and Agouti loci play a key role for proportions of eumelanin and pheomelanin in determining coat color in several species, including goat. Mongolian goats exhibit diverse types of coat color phenotypes. In this study, investigation of the melanocortin 1 receptor (MC1R) coding region in different coat colors in Mongolian goats was performed to ascertain the presence of the extension allele. Methods: A total of 105 goat samples representing three goat breeds were collected for this study from middle Mongolia. A 938 base pair (bp) long coding region of the MC1R gene was sequenced for three different breeds with different coat colors (Gobi Gurwan Saikhan: complete black, Zalaa Jinstiin Tsagaan: complete white, Mongolian native goat: admixture of different of coat colors). The genotypes of these goats were obtained from analyzing and comparing the sequencing results. Results: A total of seven haplotypes defined by five substitution were identified. The five single nucleotide polymorphisms included two synonymous mutations (c.183C>T and c.489G>A) and three missense (non-synonymous) mutations (c.676A>G, c.748T>G, and c.770T>A). Comparison of genotypes frequencies of two common missense mutions using chi-sqaure ($x^2$) test revealed significant differences between coat color groups (p<0.001). A logistic regression analysis additionally suggested highly significant association between genotypes and variation of black versus white uniform combination. Alternatively, most investigated goats (60.4%) belonged to H2 (TGAGT) haplotype. Conclusion: According to the findings obtained in this study on the investigated coat colors, mutations in MC1R gene may have the crucial role for determining eumelanin and pheomelanin phenotypes. Due to the complication of coat color phenotype, more detailed investigation needed.
Chlorpropamide, $C_{10}H_{13}N_{2}O_{3}SCI$, forms orthofombic crystals of space group $P_{2}_{ 1}2_{1}2_{1}$ with a 9.066 $\pm$ 0.004, b = 5.218 $\pm$ 0.003, c = 26, 604 $\pm$, 0.008 $\AA$, and four molecules per cell. Three dimensional photographic data were collected with Mo-K$\alpha$ radiation. The structure was determined using Patterson, Fourier and Difference syntheses methods and refined by the block-diagonal least-squares methods with anisotropic thermal parameters for all nonhydrogen atoms and isotropic thermal parameters for all hydrogen atomes. The final R value was 0.10 for the 1823 observed independent reflections. The dihedral angle between the planes through the benzene ring and the urea goup is 99$^{\circ}$. The conformational angle formed by the projection of the S-C(1) with that of N(1)-C(7) when the projection is taken along the S-N(1) bond is 76$^{\circ}$. The molecule appears to form with neighbouring molecules two hydrogen bonds, N(1)..H...O(3) and N(2)-H...0(2) of lengths 2.774 and 2.954$\AA$ respectively related by screw diads parallel to the a axis. Adjacent molecules parallel to b and c axis are bound together by van der Wasls forces.
Li, Defa;Che, X.R.;Wang, Y.Q.;Qiao, S.Y.;Cao, H.;Johnson, W.;Thacker, P.
Asian-Australasian Journal of Animal Sciences
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v.12
no.2
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pp.197-202
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1999
Three barrows weighing 45.0 kg, fitted with simple T-cannulas in both the duodenum and terminal ileum, were assigned to diets in a $3{\times}3$ Latin Square design experiment to determine the effect of two calcium levels (0.8% vs 0.4%) on phytase activity and nutrient balance in growing pigs. The control diet contained 0.8% calcium, with no added inorganic phosphorus (0.45% total phosphorus) and no added phytase. The two additional experimental diets contained microbial phytase (750 phytase units/kg) and supplied either 0.8% or 0.4% calcium. With added microbial phytase, ileal and total tract digestibility of rotal phosphorus were improved by 20.9 and 13.8 percentage units, respectively (p=0.01). The apparent duodenal and ileal digestibility of phytate phosphorus were increased by 51.8 and 49.7 percentage units (p=0.01). Lowering dietary calcium in the presence of microbial phytase increased the digestibility of phytate phosphorus by an additional 10.9 (p=0.001) and 5.7 percentage units for duodenal and ileal digestibility, respectively. Supplementation with microbial phytase significantly reduced fecal excretion of nitrogen and phosphorus and increased the percentage of these nutrients retained by the pig. Lowering dietary calcium further increased the percentage of dietary phosphorus retained. Overall, reducing dietary calcium appeared to increase the effectiveness of added microbial phytase in degrading phytate phosphorus. As a result, care should be taken to avoid high levels of dietary calcium when supplementing swine diets with microbial phytase.
Journal of the Institute of Electronics Engineers of Korea SD
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v.39
no.3
/
pp.1-8
/
2002
In order to study electric properties of (Pb$\_$0.9/La$\_$0.1/)Ti$\_$0.975/O$_3$(PLT (10)) films with varying excess lead concentration (7.5, 10, 12.5, 15 ㏖% excess lead), the PLT films were deposited by sol-gel process. DTA analyses reveal that the crystallization temperature of the precursor powers decreased with increasing amount of excess lead. XRD patterns of PLT reveal pure perovskite structure and the preferred orientation increased with increasing Pb content in the films. With increasing amount of excess P$\_$b/, the relative permittivity ($\xi$$\_$r/) increased and leakage current density at 100 ㎸/cm transformed 4.01$\times$10$\^$-5/, 2.42$\times$10$\^$-6/, 1.27$\times$10$\^$-6/, 1.56$\times$10$\^$-6/A/㎠ respectively. In the results of hysteresis loops measured at 166 kV/cm, the remanent polarization (P$\_$r/) and the coercive field (E$\_$c) are 6.36$\mu$C/cm and 58.7 ㎸/cm, respectively (at 12.5 ㏖% excess P$\_$b/) With increasing amount of excess Pb, the remanent polarization for PLT thin film degraded to about 44%, 27%, 15%, 16% of the initial value after 10$\^$9/ cycles./TEX>) With increasing amount of excess Pb, the remanent polarization for PLT thin film degraded to about 44%, 27%, 15%, 16% of the initial value after $10^{9}$ cycles.
Hwang, Yu Kyeong;Kim, Hyung-Il;Kim, Nam Kyung;Park, Jung Min;Cheong, Hong Seok
IMMUNE NETWORK
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v.2
no.1
/
pp.41-48
/
2002
Background: Viral antigens presented on the cell surface in association with MHC class I molecules are recognized by CD8+ T cells. MHC restricted peptides are important in eliciting cellular immune responses. As peptide antigens have a weak immunigenicity, pH-sensitive liposomes were used for peptide delivery to induce effective cytotoxic T lymphocyte (CTL) responses. In the previous study, as the HBx peptides could induce specific CTLs in vitro, we tested whether the HLA-A2/$K^b$ transgenic mice that were immunized by HBx-derived peptides could be protected from a viral challenge. Methods: HBx-peptides encapsulated by pH-sensitive liposomes were prepared. $A2K^b$ transgenic mice were immunized i.m. on days one and seven with the indicated concentrations of liposome-encapsulated peptides. Three weeks later, mice were infected with $1{\times}10^7pfu$/head of recombinant vaccinia virus (rVV)-HBx via i.p. administration. The ovaries were extracted from the mice, and the presence of rVV-HBx in the ovaries was analyzed using human TK-143B cells. IFN-${\gamma}$ secretion by these cells was directly assessed using a peptide-pulsed target cell stimulation assay with either peptide-pulsed antigen presenting cells (APCs), concanavalin A ($2{\mu}g/ml$), or a vehicle. To generate peptide-specific CTLs, splenocytes obtained from the immunized mice were stimulated with $20{\mu}g/ml$ of each peptide and restimulated with peptide-pulsed APC four times. The cytotoxic activity of the CTLs was assessed by standard $^{51}Cr$-release assay and intracellular IFN-${\gamma}$ assay. Results: Immunization of these peptides as a mixture in pH-sensitive liposomes to transgenic mice induced a good protective effect from a viral challenge by inducing the peptide-specific CD8+ T cells. Mice immunized with $50{\mu}g/head$ were much better protected against viral challenge compared to those immunized with $5{\mu}g$/head, whereas the mice immunized with empty liposomes were not protected at all. After in vitro CTL culture by peptide stimulation, however, specific cytotoxicity was much higher in the CTLs from mice immunized with $5{\mu}g/head$ than $50{\mu}g/head$ group. Increase of the number of cells that intracellular IFN-${\gamma}$ secreting cell among CD8+ T cells showed similar result. Conclusion: Mice immunized with XEPs within pH-sensitive liposome were protected against viral challenge. The protective effect depended on the amount of antigen used during immunization. XEP-3-specific CTLs could be induced by peptide stimulation in vitro from splenocytes obtained from immunized mice. The cytotoxic effect of CTLs was measured by $^{51}Cr$-release assay and the percentage of accumulated intracellular IFN-${\gamma}$ secreting cells after in vitro restimulation was measured by flow cytometric analysis. The result of $^{51}Cr$-release cytotoxicity test was well correlated with that of the flow cytometric analysis. Viral protection was effective in immunized group of $50{\mu}g/head$, while in the in vitro restimulation, it showed more spectific response in $5{\mu}g$/head group.
We have employed comparative RFL,P(Restriction Fragment Ixngth Pol~iniorphism) analysis and molecular phylogenetic techniques to investigate the diversity of uncultured microorganisms associated with the anaerobic PCP degradation in PCP-adapted enrichment cultures inoculated by samples from anaerobic cewage sludgc(Jangrim, Pusan) and leachate of landfill site(Kimhae). 16s rDNA cloncs were obtairted by PCR amplification of mixed population DNAs extracted directly from the nonactive and active stage ol each PCP-adapted culture. After three rounds of comparative RFLP analyses. two RFLP types. designated as Ala and Hld, were found prevalent and common in both active stage samples. Thc analysis of phylogenctic diversity bawd on the 5'-terminal 180 nt of sequences from whole clones of the Ala and Bld RFLP types showed close similarity among themselves. In case of Bld clones, 7XQ of them shared identical sequences. Thcse resuliq suggest that the clones of both RFLP types wcre originated from highly affiliated microorganisms which are e~iriched as a result of metabolic activity to PCP. The full-length 16s rRNA sequence of each representative clone from both RFLP types was determined. and an Ala clone w i n found to he related to Clo.strrdiurn ulfutzac~(Genk~ank No. Z69203) and a Bld clone to Thermobacteroides proteolyticus(Genbank No. X09335), with sequence similarities of 89%' and 97%. respectively.
The complexes M(CO)4-1,2-(PPh2)2-1,2-C2B10H10 (M=Cr 2a, Mo 2b, W 2c) have been prepared in good yields from readily available bis-diphenylphosphino-o-carboranyl ligand, closo-1,2-(PPh2)2-1,2-C2B10H10 (1), by direct reaction with Group Ⅵ metal carbonyls. The infrared spectra of the complexes indicate that there is an octahedral disposition of chelate bis-diphenylphosphino-o-carboranyl ligand around the metal atom. The crystal structure of 2a was determined by X-ray diffraction. Complex 2a crystallizes in the monoclinic space group P21/n with cell parameters a = 12.2360(7), b = 17.156(1), c = 16.2040(6) Å, V = 3354.1(3) Å3, and Z =4. Of the reflections measured a total of 2514 unique reflections with F2 > 3σ(F2) was used during subsequent structure refinement. Refinement converged to R1 = 0.066 and R2 = 0.071. Structural studies showed that the chromium atom had a slightly distorted pseudo-octahedral configuration about the metal center with two phosphine groups of o-carborane occupying the equatorial plane cis-orientation to each other. These metal carbonyl complexes are rapidly converted to the corresponding metal carbene complexes, [(CO)3M=C(OCH3)(CH3)]-1,2-(PPh2)2-1,2-C2B10H10 (M= Cr 3a, Mo 3b, W 3c), via alkylation with methyllithium followed by O-methylation with CF3SO3CH3.
This research is to compare the infant's temperament and parenting stress perceived by premature infants' mother and full-term infants' mother. It aims at establishing the healthy relationship between mothers and infants. It investigates the basic data of nursing intervention program to help the mother of premature infant. The period of data collection was from May 1, 2005 to May 30, 2005, and the subjects were total 123 mothers: 44 mothers of premature infants and 79 mothers of full-term infants under 6 months who visited general hospitals, individual pediatrics, and health center located in G city. "What My Baby Is Like(WBL)" developed by Pridham, Chang, and Chiu(1994) and translated by Bang Kyeong Sook(1999) was used as a measuring instrument of infants' temperament, and Parenting Stress Index (PSI) developed by Abidin(1990) and revised and complemented by Kim Dong Hee(1997) was used as a measuring instrument of parenting stress. Collected Data were analyzed through $X^2$-test, t-test, Pearson's correlation with SPSS 12.0 window program. The results are as follows: 1. There was a significant difference in the infant's temperament perceived by premature infants' mothers and full-term infants' mothers (t=-4.08, p=.00). In subcategory, there were significant difference between premature infants' mother and full-term infants' mother in geniality(t=-3.62, p=.00), adaptation(t=-3.43, p=.00) and reaction(t=-2.01, p=.05). 2. There was a significant difference in parenting stress between premature infants' mother and full-term infants' mother(t=6.57, p=.00). The parenting stress of premature infants mothers appeared to be higher than full-term infants' mothers. They showed the higher stress in the mother-child relationship area(t=6.27, p=.00) and child area(t=7.38, p=.00) among 3 areas of parenting stress. 3. There were negative correlation between infants' temperament and parenting stress. As mothers perceived the infant's temperament negatively, the parenting stress. Especially, the negative correlation of infants' temperament and parenting stress of premature infants' mothers(r=-.44) was stronger than that of full-term infants' mothers(r=-37). From the research, as mothers of premature infants receive more stress, their stress can cause the serious problem to the relationship of the mother and the infant. Therefore, the nursing intervention should be carried out in order to change the negative perception of mothers towards their infants into the positive perception reduce the parenting stress.
These experiments were carried out to optimize the parameters of electrical activation, methods of parthenogenetic activation and embryo culture in vitro and meanwhile to isolate embryonic stem cells-like (ESCs) derived from porcine parthenogenetic blastocysts (pPBs). These results showed that, as the electric field strength increased from 1.0 to 2.7 kV/cm, the cleavage rate of parthenogenetic embryos increased gradually but the rate of oocyte lysis was significantly increased when using 2.7 kV/cm field strength. The rate of cleavage in 2.2 and 2.7 kV/cm groups was significantly increased in comparison with that of the 1.0 kV/cm group. A voltage field strength of 2.2 kV/cm DC was used to investigate blastocyst development following activation with a single pulse of 30 or $60-{\mu}sec$ pulse duration. The optimum pulse duration was 30-${\mu}sec$, with a blastocyst rate of 20.7%. Multiple pulses were inferior to a single pulse for blastocyst yield (8.0% vs. 29.9) (p<0.05). For porcine oocyte parthenogenetic activation methods, the rates of cleavage (79.0% vs. 59.8%) and blastocysts (19.4% vs. 3.4%) were significantly increased in electrical activation in contrast to chemical activation with ionomycin/6-DMAP (p<0.05). Rates of cleavage and blastocyst formation in NCSU-23 and PZM-3 embryo media were higher than those of G1.3/G2.3 serial culture media, but there was no significant difference among the three groups. The total cell number of blastocysts in PZM-3 embryo culture media containing $5{\mu}g/ml$ insulin was significantly higher than that of the control (no insulin) ($44.3{\pm}9.1$ vs. $33.9{\pm}11.7$). For isolation of PESCs-like, the rates of porcine blastocysts attached to feeder layers and ICM colony formation in Method B (nude embryo culture) were better than those in Method A (intact embryo culture).
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