• Journal of the Korean Home Economics Association
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• v.39 no.12
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• pp.129-140
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• 2001

The effects of material monitoring and information sources of maternal knowledge on externalizing and internalizing behaviors of adolescents were examined with a sample of 323 ninth-grade middle school students(163 boys and 160 girls) and their mothers. Data were collected using questionnaires regarding maternal monitoring, information sources of maternal knowledge, and externalizing and internalizing behaviors of adolescents. The major findings were that 1) unemployed mothers showed more monitoring than employed mothers; 2) mothers perceived that girls showed more self-disclosure and were more controlled by them than boys; 3) girls showed more internalizing behavior than boys; 4) the more adolescents were monitored by their mothers, the less internalizing behavior they showed; 5) the more maternal solicitation was used, the more externalizing behavior girls showed; 6) adolescents showed the least externalizing behavior when maternal monitoring was highly perceived by both mothers and adolescents. And perception of maternal monitoring by adolescents themselves plays an important role in showing less externalizing behavior.

• Korean Journal of Child Studies
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• v.23 no.3
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• pp.171-186
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• 2002

This study of variables associated with maternal monitoring of child's whereabouts and daily activities was conducted with 1500 children (8 and 13 years of age) and their mothers. They responded to questionnaires on monitoring knowledge, sources of maternal information (maternal solicitation and/or child disclosure), and demographic variables. Data were analyzed by Pearson's r, ANOVA, and regression analysis. Mothers' knowledge of her child's activities and whereabouts and the sources of her knowledge were associated with mothers' higher level of education. Child's age was related to mother's knowledge and maternal solicitation. Maternal solicitation and child's age were highly predictive of mothers' knowledge of her child's whereabouts and activities. Results of this study may have applications for parental supervision and child rearing attitudes.

• Asian-Australasian Journal of Animal Sciences
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• v.15 no.8
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• pp.1222-1226
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• 2002

Estimates of genetic correlation between direct and maternal effects for weaning weight of beef cattle are often negative in field data. The biological existence of this genetic antagonism has been the point at issue. Some researchers perceived such negative estimate to be an artifact from poor modeling. Recent studies on sources affecting the genetic correlation estimates are reviewed in this article. They focus on heterogeneity of the correlation by sex, selection bias caused from selective reporting, selection bias caused from splitting data by sex, sire by year interaction variance, and sire misidentification and inbreeding depression as factors contributing sire by year interaction variance. A biological justification of the genetic antagonism is also discussed. It is proposed to include the direct-maternal genetic covariance in the analytical models.

• Asian-Australasian Journal of Animal Sciences
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• v.20 no.3
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• pp.313-315
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• 2007

Seventeen haplotypes were detected from the complete mitochondrial DNA control region sequences analyzed from eighty individuals of two Tibetan domestic sheep breeds. The nucleotide composition of all the sequences was 33.0% A, 29.7%T, 22.9%C and 14.4%G; G+C was 37.3%. The length of the sequences ranged from 1,107 bp to 1,259 bp. The difference between them was primarily due to 3-5 copy numbers of a 75 bp tandem repeat sequence. The NJ phylogenetic tree (the number of replications of bootstrap test is 1,000) presented three major domestic sheep lineages, which suggested that modern Tibetan sheep breeds are derived from three maternal sources.

• Journal of Nutrition and Health
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• v.33 no.3
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• pp.263-270
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• 2000

The purpose of this study was to evaluate the concentration of vitamin B6 in 16 pregnant-infant pairs and 15 nonpregnant women and to investigate the relationships between vitamin B6 status of maternal-umbilical cord plasma and pregnancy outcomes. dietary intake was obtained from semiquantitative frequency questionnaire. The daily mean energy and protein intakes were higher than the recommended dietary allowance, while daily vitamin B6 was only 74% of RDA in pregnant and 73% of RDA in nonpregnant women. The main sources of vitamin B6 were vegetables and fruits in pregnant women, while cereal and starch in nonpregnant women. The plasma PLP and PL levels of pregnant women were 14.85nmol/l and 20.56nmol/l, significantly lower than those of nonpregnant women. the PLP/PL ratios of pregnant and nonpregnant women were 1.65 and 0.33, indicating that the levels of vitamin B6 was altered during pregnancy. The PLP and PL levels of umbilical cord plasma were 63.55nmol/l and 32.25nmol/l, respectively. The vitamin B6 levels of umbilical cord plasma were significantly higher than that of maternal plasm. This finding indicates that the uptake of vitamin B6 in the fetus may be due to an active placental transport mechanism. The PLP level of maternal plasma correlated positively with that of umbilical cord plasma, showing the PLP concentration of umbilical cord plasma is affected by maternal vitamin B6 status. The maternal plasma PL level showed a positive correlation to infant birth weight. The positive association has bee also found between plasma PL level of umbilical cord and Apgar 1 min score.

• Journal of radiological science and technology
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• v.45 no.4
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• pp.331-339
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• 2022

The purpose of this study was to evaluate maternal organ and fetal doses by week of pregnancy for pregnant women nuclear medicine practitioners in the nuclear medicine field. In addition, we intend to present basic data for the management of exposure doses of female nuclear medicine practitioners. In this study, phantoms of childbearing women, 3, 6, 9 months pregnant women were simulated using MCNPX(Monte Carlo N-Particle Extended) among the Monte Carlo methods. First, volume source was constructed based on 10 cm of the anterior part of the lower abdomen of the phantom, and the organ and fetal doses were evaluated for each week of the pregnant woman according to the type of radioactive isotope. Second, the organ and fetal dose of pregnant women were evaluated by increasing the distance between the source and the abdominal surface by 50 and 100 cm. As a result, ¹⁸F sources showed high organ and fetal doses in pregnant women 0 to 3 months, and the dose distribution gradually decreased in 6 to 9 months pregnant women. The distribution of organ and fetal doses for ⁹⁹mTc and ¹²³I sources showed the same tendency as that of ¹⁸F, and the overall absorbed dose distribution was relatively lower than that of ¹⁸F. Through this study, it is considered that workers in the early stages of pregnancy within 3 months will need appropriate management to minimize occupational exposure dose.

• Asian-Australasian Journal of Animal Sciences
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• v.20 no.1
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• pp.19-24
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• 2007

Covariance components and genetic parameters of weekly live body weight from hatching to six weeks of age and age of sexual maturation were estimated in a laying type Japanese quail line. The univariate and bivariate animal model analysis included hatching group and sex as fixed effects. Each trait was analysed with animal as random effect to fit the additive direct effect. Additional random effects incorporated in the models were changed according to the trait examined. The best model for a trait was chosen based on a likelihood ratio test, comparing the models with and without maternal additive genetic and maternal permanent environmental effects. Heritability estimates of live-weight at hatch and one to six weeks of age with their standard errors were 0.22${\pm}$0.088, 0.39${\pm}$0.099, 0.31${\pm}$0.086, 0.38${\pm}$0.056, 0.46${\pm}$0.055, 0.50${\pm}$0.059, and 0.56${\pm}$0.062, respectively. Direct heritability value of age of sexual maturation was moderate (0.24${\pm}$0.055). The variances due to permanent environmental effect of dam after one week of age and maternal genetic effect after two weeks of age were not important sources of variation. The correlations between direct and maternal genetic effects were negative and ranged from high to moderate values (-0.21 to -0.83). Among the weekly live weights, genetic correlations were generally high between not only successive but also early and late weightings. It suggests that selection for final weight may be based on early weight records. Genetic correlations between age of sexual maturation and live weights were low, favourable but had high standard errors. These results indicate that selection for high weight will potentially result in lower age of sexual maturation only with accurate determination of breeding values.

• Clinical and Experimental Pediatrics
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• v.60 no.3
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• pp.70-76
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• 2017

Purpose: This study investigated self-food restriction during breastfeeding, reviewed the literature showing the effect of maternal diet on the health of breast-fed infants, and explored the validity of dietary restrictions. Methods: Questionnaire data were collected from breastfeeding Korean mothers who visited the pediatric clinic of Cheil General Hospital & Women's Healthcare Center from July 2015 through August 2015. The survey included items assessing maternal age, number of children, maternal educational attainment, household income, degree of difficulty with self-food restriction, types of self-restricted foods, dietary customs during breastfeeding, and sources of information about breastfeeding. Results: The questionnaire was completed by 145 mothers. More than a third (n=56, 39%) had discomfort from and usually avoided 4-5 types of food (mean, 4.92). Mothers younger than 40 years had more discomfort (odds ratio [OR], 12.762; P=0.017). Primiparas felt less discomfort than multiparas (OR, 0.436; P=0.036). Dietary practices were not influenced by maternal educational attainment or household income. The most common self-restricted foods were caffeine (n=131, 90.3%), spicy foods (n=124, 85.5%), raw foods (n=109, 75.2%), cold foods (n=100, 69%), and sikhye (traditional sweet Korean rice beverage) (n=100, 69%). Most mothers (n=122, 84.1%) avoided foods for vague reasons. Conclusion: Most mothers restricted certain foods unnecessarily. Literature review identified no foods that mothers should absolutely avoid during breastfeeding unless the infant reacts negatively to the food.

• The Plant Pathology Journal
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• v.28 no.4
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• pp.418-422
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• 2012

Eleven hot pepper accessions collected in Vietnam showed stable resistance to bacterial wilt as well-known resistance sources, MC4 and MC5, in repeated inoculation tests with different Ralstonia solanacearum isolates conducted from 2004 to 2010. Seven of these accessions (specifically KC981, KC1006, KC1021, KC1027, KC1045, KC1050, and KC1055) resulted in stable male sterile F1 plants in the crosses with a cytoplasmically male sterile (CMS) Chilseong (CMS-A, Srfrf ), and therefore, they were maintainers (CMS-B) with a genotype of Nrfrf. The rest (KC980, KC995, KC999, and KC1009) produced stable male fertile F1 plants in the crosses, and therefore, were restorers (CMS-C) with a genotype of N(S)RfRf. Therefore, the maintainer and restorer sources of resistance may be used in preference in breeding maternal (CMS and their maintainers) and paternal parents (restorers) for resistance to bacterial wilt, respectively, in the hybrid breeding system utilizing cytoplasmic male sterility.

• Journal of Nutrition and Health
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• v.28 no.7
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• pp.636-643
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• 1995

This study was conducted to find some differences in infant feeding pattems between well educated Koreans and local populations living in Texas, USA. Initiation rate of exclusive breastfeeding in the hospital was 35.9% in Koreans and 60.4% in Americans. At 2, 4 and 6 months, exclusive breastfeeding rates were 34.0%, 20.8% and 13.2% for Koreans and 47.2%, 34.0% and 27.2% for Americans respectively. There was a significant difference in age of weaning from breast between these two groups(p<0.01). In Koreans the most common reason for the early termination before 4 months was maternal report of milk insufficiency. 55.6% of Koreans and 42.3% of Americans fed infants on scheduled rather on demand feeding. Primary sources of advice about feeding were medical professionals in Americans while baby's grandmother was the main source in Koreans. In Americans, choice of breastfeeding was not associated with ethnicity, maternal education, and family income in the study. Interventions to promote and support participants of Women Infants and Children(WIC) may play a role in Americans. It might be suggested that effective nutrition education programs targeting for Korean mothers to promote breastfeeding should be needed urgently and systematically.