• Korean Journal of Plant Taxonomy
• /
• v.41 no.3
• /
• pp.202-208
• /
• 2011

The present study was focused on the careful investigation of Glechoma longituba flowers collected from four populations in Korea to clarify their precise sexual systems. All floral characters of this taxon were examined by using a stereo microscopy. The nutlet size and production were compared between two distinct morphs (i.e., hermaphrodites and females), and pollen viability test of hermaphrodite and intermediate phenotype (i.e., individuals with a mixture of females and perfect flowers) was also observed by light microscopy (LM). All of the investigated floral characters of G. longituba are significantly different from one sexual morph to another. Hermaphroditic plants were larger than the female ones in corolla width and length, calyx length, filament length, anther length, and style length (all P < 0.0001, respectively). However, the nutlet width of the female plants was larger than those of the hermaphrodites (P = 0.013). Nutlet production of females was higher than hermaphrodites in Na-Ju population [H (Hermaphrodite): ca. 17.76%, F (Female): ca. 37.45%], but in Mun-San population was no significant difference between these sexual morphs (H: ca. 57.52%, F: ca. 53.16%). We have found significant differences between the fertile pollen grain of hermaphrodite and sterile pollen grain of intermediate phenotype based on pollen size and viability. The results of the present study suggest that compensation (flower size dimorphism, seed set, and pollen viability) is one of the main mechanisms in order to maintain female plants in gynodioecious G. longituba.

• Journal of the Korean Home Economics Association
• /
• v.37 no.1
• /
• pp.1-13
• /
• 1999

The purpose of this study is to find how the mate selection and sex consciousness reflected in Samhuk Yusa. We set up the following two questions for aim of this study. First, how are the real aspects and specific characters of mate selection reflected in Samguk Yusa? Second, how are the real aspects and specific characters of sex consciousness reflected in Samguk Yusa? The results can be summarized as follows; 1. Mate selection reflected in Samguk Yusa discussed into two major domains, one is spouse conditions and the other is marriage form. Men and Women are married at teenages, but the greater part of case is unidentified, so in order to approach this we need to analyse other historical documents. In men and women, standard of appearance and personality is difference. Analyzed case about appearance is a few, also we need to analyse other historical materials. More valued personality is wisdom in men, and in women more valued personality is virtue, brightness, graceful and mild. Through in case of to overcome the cultural gabs, the society must be open in every area. The marriage form is diversity, examples, free marriage, a marriage of convenience type, etc. Especially in aspects remarriage of man and woman is free in every class. 2. Sex consciousness reflected in Samguk Yusa discussed into three major domains, first is discussion about sex, second is premarital sexual behavior, third is extramarital. Through the case of discussion about sex is opened so there is not existence double blinded in sexual norms. Also through the case of premarital sexual behavior and extramarital, fidelity ideology does not yet come into existence.

• Korean Journal of Fisheries and Aquatic Sciences
• /
• v.53 no.1
• /
• pp.50-56
• /
• 2020

Determination of the precise size at sexual maturity is very important for science-based stock assessment and fisheries resource management. In this study, two different models, (1) a visual method and (2) a gonadosomatic index (GSI) method, were employed to estimate length at sexual maturity of the small yellow croaker Larimichthys polyactis in the Yellow Sea of Korea. The visual method is a common qualitative method using visual gonadal identification. Conversely, the GSI method is a quantitative method using the GSI, which can be easily and precisely collected. We compared results from these methods to determine the best approach, and to examine the practicality of the GSI method. Logistic regression of the maturity ogive was conducted using a general linear model (GLM) with the R statistics program. Also, the bootstrapped 95% confidence intervals of all estimates were calculated. The best-fit model was the visual method (R_Mc²=0.805, AUC=0.989, L₅₀=15.1). Among models using the GSI method, the model computing GSI_ref=0.94 was the best-fit model (R_Mc²=0.792, AUC=0.989, L₅₀=15.2). There was no significant difference between the two models, evidencing the effectiveness and accuracy of the GSI method.

• Applied Microscopy
• /
• v.31 no.1
• /
• pp.91-99
• /
• 2001

The antennal sensilla of the adult male and female ladybird beetle, Harmonia axyridis (Coleoptera: Coccinellidae) were examined by scanning electron microscopy. Nine types of sensilla were characterized and grouped into 5 morphological classes: $B\ddot{o}hm$, basiconic, chetiform, coeloconlc, and trichoid sensilla. $B\ddot{o}hm$ sensilla were localized on the scape and pedicel, part of the ventral and dorsal proximal side. This placement suggests a role in proportion of antennal position and movement. Basiconic and chetiform sensilla were divided into 3 subtypes by morphology and length differences. Trichoid sensilla are confined to the last 2 flagellum segments on both sexes. Sexual dimorphism of antennal sensilla is limited to the three types of difference. The principal characteristics of this dimorphism are the following: a) The distribution of sensilla was differ from male and female in antennae. b) Males exhibit coeloconic sensilla not present in females; c) Females posses more trichoid sensilla than males. The possible role of specific dilference of the sensilla in intersexual communication is discussed.

• Journal of Fisheries and Marine Sciences Education
• /
• v.24 no.6
• /
• pp.1003-1012
• /
• 2012

The gonadosomatic index (GSI), sex steroid hormones and gonadal development of roughscale sole Clidoderma asperrimum cultured in indoor tank were investigated to evaluate its sexual maturation and reproductive cycle. The highest GSI values of female and male were $6.91{\pm}4.03$ (May) and $0.16{\pm}0.08$ (August), respectively. The reproductive cycle would be classified into four successive developmental stages: growing stage (December to February), maturation stage (March to April), ripe and spawning stage (May to June), recovery and resting stage (July to November). The highest plasma testosterone (T) and estradiol-$17{\beta}$ ($E_2$) levels of female were $259.4{\pm}76.8$ and $633.3{\pm}182.5$ pg/mL, respectively in May. Also $17{\alpha}$, $20{\beta}$-dihydroxy-4-pregen-3-one ($17{\alpha}$, $20{\beta}$-OHP) levels of female peaked in April before spawning season ($244.2{\pm}42.5$ pg/mL). The highest plasma testosterone (T) and 11-ketotestosterone levels of male were $231.0{\pm}46.0$ and $273.9{\pm}54.5$ pg/mL, respectively in April. But there was no significant difference in $17{\alpha}$, $20{\beta}$-OHP.

• Journal of Digital Convergence
• /
• v.13 no.5
• /
• pp.345-356
• /
• 2015

This study analyzed the health risk behavior of Korean college students by comparing them based on the college location (Seoul vs. non-Seoul). Converging analyses of health risk behaviors (drinking behavior, sex, suicidality) and health risk factors (mental health, stress) were attempted. The results showed the 23% of students were at risk of serious drinking problem, and the 52.6% of students consumed alcohol once in every other week or more often. In case of the sexual behavior, 40.6% had sexual experience. Importantly, the 25.4% and the 20.3% of college students in Seoul and non-Seoul area, respectively, had two or more sexual partners. Also, students in non-Seoul area had a tendency of the higher level of suicidality, and the lower level of mental health. Overall, the self-respect score was the only statistically significant factor showing the Seoul/non-Seoul difference. These results may be able to intervene the health risk behaviors of college students.

• Journal of Physiology & Pathology in Korean Medicine
• /
• v.20 no.4
• /
• pp.1057-1062
• /
• 2006

In order to research the interrelationship of symptoms of 5 visceral diseases through Pearson's correlative coefficient and to understand the diagnostic importances of each symptom and sexual differences in the main symptoms of each visceral diseases using Cronbach alpha. For this 500 female and 120 male cases of questionnaire were collected and analyzed. In the main symptoms of 5 visceral diseases, there were a little differences between this results and existing symptom-complex system. And in the comparison of most frequently manifesting symptoms to male and female subject, Heart and Pancreas and Kidney disease were almost same, but Liver disease was different and Lung disease was slightly different. Conclusively, the diagnostic reliability of the abstracted symptom-complex of 5 viscera was graded from Kidney(Cronbach alpha 0.8771555), Pancreas(0.865978), Liver(0.815013), Heart(0.78653) to Lung disease(0.6294695) sequentially. And the each Cronbach alpha was valuable to be permitted as diagnostic criteria of 5 visceral diseases.

• Journal of Preventive Medicine and Public Health
• /
• v.16 no.1
• /
• pp.13-18
• /
• 1983

This study was attempted to define epidemiologically the possibility and the magnitude of sexual transmission of HBV in Korea. Two groups of prostitutes; one group (309) deals with Koreans, the other group (126) deals with American soldiers stationing in Korea, were tested for the presence of HBsAg and anti-HBs. The prevalence rate of HBsAg or anti-HBs was significantly higher in prostitutes who deal with Koreans (41.7%) than in prostitutes who deal with American soldiers (30.2%) (p<0.025). Among the prostitutes who deal with American soldiers, there was no appreciable difference in the prevalence rate of HBsAg or anti-HBs by the duration of prostitution. However, among the prostitutes who deal with Koreans, the prevalence rate was increased with the duration of prostitution, although it did not reach the statistically significant level (p=0.12). There was no remarkable association between the prevalence rate of HBsAg or anti-HBs and educational level, history of operation or history of transfusion. The data support the possibility of sexual transmission of viral hepatitis B but it seems seems sexual transmission does not contribute significantly to the prevalence rate of HBsAg or andi-HBs in Korea.

• Journal of Korean Society of Forest Science
• /
• v.108 no.1
• /
• pp.133-137
• /
• 2019

This study was conducted to clarify the morphological characteristics of Siberian flying squirrel (Pteromys volans). We investigated 6 morphological characteristics from April, 2014 to March 2016 at Mt. Baekwoon, Wonju, Gangwon province. We found that Siberian flying squirrel showed female-biased sexual dimorphism. This result would be related to reproductive strategy of the species which female nurse offspring alone. As results of comparison of morphological characteristics from Korea, Finland and Japan, both body weight and head-body length appeared heavier and longer from high-latitude to low-latitude. This result suggest that morphological difference between different latitudes would be related with climate and habitat environment. The more researches would be needed with other morphological characteristics of Siberian flying squirrel.

• International Journal of Human Ecology
• /
• v.15 no.1
• /
• pp.64-71
• /
• 2014

This study empirically compares the influence of sex-appeal fashion Point-of-Purchase (POP) types on attitude towards advertising. It also highlights the moderating roles of gender and the level of sensation seeking. Three sex-appeal fashion POP types (nude/semi-nude/body conscious) were developed for this study and the interaction effect of the types of sex-appeal fashion POP advertising and gender was tested. In addition, interaction effect of the types of sex-appeal fashion POP advertising and the level of sensation seeking (high/low) was tested. The results found that gender influenced consumer attitudes toward sex-appeal fashion POP advertising type. Male consumers showed a more favorable attitude toward advertising for the nude type than others; however, female consumers showed a more favorable attitude toward advertising for semi-nude and body conscious type than the nude type. The results also found a significant two-way interaction effect of sexual POP advertising types and sensation seeking on attitude toward POP advertising. High sensation seekers preferred nude and semi-nude type POP advertising to body conscious POP advertising. It is useful to investigate how various marketing factors support attitude toward POP advertising in the context of sexual fashion POP advertising and which factors exert the strongest influence within different degrees of nudity.