• 대한약학회:학술대회논문집
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• 대한약학회 2002년도 Proceedings of the Convention of the Pharmaceutical Society of Korea Vol.2
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• pp.295.2-296
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• 2002

An organophosphate pesticide terbufos (S-t-butylthiomethyl-O.O-diethyl phosphorodithioate; TBF) has been extensively used as an insecticide. A sexual dimorphism in TBF toxicity was not reported and remains unclear. Objective of the work is to investigate the influence of TBF on sexual dimorphism in rats by using acethlcholinesterase (AchE). (omitted)

• 한국발생생물학회지:발생과생식
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• 제22권2호
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• pp.183-192
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• 2018

The morphometric truss characteristics and classical dimensions of the marine medaka, Oryzias dancena, that might distinguish diploid and triploid fish were examined. Significant differences in all the classical and truss dimensions of the diploid and triploid fish were observed in both sexes (p<0.01). All the dimensions of the triploid fish were greater than those of the diploid fish. The triploid marine medaka shows sexual dimorphism in these characters, and the sexual dimorphism of the triploid marine medaka is similar to that of the diploid marine medaka. Thus, when their classical dimension and truss dimension was measured, the growth of triploid marine medaka is faster than that of the diploid fish, and it displays clear sexual dimorphism, with male fish having longer dorsal and anal fins than female fish.

• Journal of Plant Biology
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• 제2권1호
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• pp.61-63
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• 1959

• 치위생과학회지
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• 제22권4호
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• pp.249-255
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• 2022

Background: Sexual dimorphism is important for sex determination in the field of forensics. However, sexual dimorphism is commonly assessed using cone beam computed tomography (CBCT) rather than three-dimensional (3D) modeling software; therefore, studies using a more accurate measurement approach are necessary. This study assessed the sexual dimorphism of the MS using a 3D modeling program to obtain information that could contribute to the fields of surgery and forensics. Methods: The CBCT data of 60 patients (age, 20~29 y; 30 males and 30 females) admitted to the Department of Orthodontics at the Dankook University School of Dentistry were provided in Digital Imaging and Communications in Medicine (DICOM) format. The left MS and right MS were modeled based on the DICOM files using the Mimics (version 22; Materialise, Leuven, Belgium) 3D program and converted to stereolithography (STL) files used to measure the width, length, and height of the MS, infraorbital foramen (IOF), right MS, and left MS. The average of three repeated measurements was calculated, and a reliability test was performed to ensure data reliability (Cronbach's α=0.618). A canonical discriminant analysis was performed using a standard approach (left: Box's M=0.096; right: Box's M=0.115). Results: Males had greater values for all parameters (MS width, MS length, MS height, IOF, right MS, left MS) than females. The discriminant analysis identified six independent variables (MS width, MS height, MS length, IOF, right MS, left MS) that could identify sex. The left MS and right MS correctly identified the sex of 81.7% and 71.7% of the patients, respectively, with the left MS having higher accuracy. Conclusion: This study confirmed that, for Korean individuals, the left MS has a better ability to identify sex than the right MS. These results may contribute to sex identification in the fields of surgery and forensics.

• The Korean Journal of Ecology
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• 제28권5호
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• pp.295-303
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• 2005

밀어의 성적 이형과 수컷 사이의 이형에 대하여, 2005년 5월에 강원도 춘천시 서면 오월리의 지암천에서 채집한 개체군을 대상으로 조사한 결과는 다음과 같다. Female과 maleL의 체장 분포와 성비는 거의 유사하였으나 males는 40 mm이하의 개체들이 대부분으로 female과 maleL에 비하여 소형 개체들이었으며, maleL : maleS의 비는 1 : 0.46이었다. Female(N=79)과 maleL(N=79)의 계측형질 중 18개 형질(SNL, AHD, PHD, ML, DL, MW, AHW, IFW, PHW, ED, HL, FDFL, SDFB, CFL, AFB, VFL, PFL, PFB)에서 유의한 차이(P<0.05)가 인정되었으며, 이들 중 SNL, AHD, ML, DL, MW, AHW, IFW, PHW, HL, FDFL, CFL, PFB 등 12개 형질은 현저한 차이(P<0.001)를 나타내었다. Female(N=36)과 maleS(N=36)의 비교 결과 8개 형질(SNL, ML, DL, MW, HL, CR, VFL, PFL)에서 유의한 차이(P<0.05)가 인정되었으며, 이들중 ML, DL, HL 등 3개의 측정 형질에서는 현저한 차이(P<0.001)가 있었다. Male(N=36)과 maleS(N=36)의 측정 형질 중 SNL, AHD, PHD, ML, DL, MW, AHW, IFW, PHW, HL, FDFL 등 모두 11개 형질에서 유의한 차이(P<0.05)가 인정되었으며, 11개 형질 중 ML., DL, MW, AHW, HL, FDFL 등 6개 형질은 큰 차이(P<0.001)가 있었다.

• 한국발생생물학회지:발생과생식
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• 제20권4호
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• pp.331-347
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• 2016

Sexual dimorphism is the most conspicuous difference between the sexes. This study examines possible sexual dimorphism and the relative growth patterns of morphometric characteristics in the marine medaka, Oryzias dancena for their potential to help differentiate between males and females of this species. The von Bertalanffy growth parameters estimated by a non-linear regression method were $L_{\infty}=30.2mm$, K=3.22/year, and ${\tau}_0=-0.05$. All 18 characteristics measured showed a difference between males and females from 70 days after hatching. Each of these characteristics were significantly different between sexes (ANCOVA, P<0.05), and the ratio of standard length between sexes showed that males were larger than females for all five morphometric measurements. Fin length measurements were taken for 21 distances of anal fin and 7 distances of dorsal fin between landmarks. There were all differences for all dorsal fin rays between the males and the females and there is significant difference in 70 days after their hatch when the sexual dimorphism is presented. The significant difference (P<0.05) in fin ray for male and female was more greatly seen as they grow. Male marine medaka showed more rapid growth than females, with longer length, dorsal fins and anal fins. Differences in these characteristics will be useful during experiments when it is necessary to differentiate between sexes of marine medaka.

• Journal of Ecology and Environment
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• 제31권1호
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• pp.17-21
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• 2008

Mating behaviour of the gammarid amphipod, Hyale rubra, was observed. H. rubra displayed precopulatory mate guarding: males clasped females with their gnathopods during copulation, forming a pair. Males also participated in embryo care during the incubation period. The population was small, and the sex ratio was almost equal. Energy allocation for mating effort and parental effort in the two sexes appear to be almost equal. The mating system was sequentially polygamous (or promiscuous) and there was conspicuous sexual dimorphism in the size of the gnathopod, which was used for mate guarding. However, there appears to be relatively weak sexual competition for mating opportunities despite conspicuous sexual dimorphism. H. rubra did not display territorial competition or external fertilization. Nevertheless, the male provided paternal care. Since H. rubra inhabit tide pools and live on algae, the polygamous mating system of the species can be explained by the polygyny threshold model. The evolution of mate guarding and parental care may have been favored by the species' low population density and harsh environments, an interpretation consistent with the optimality model.

• Applied Microscopy
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• 제31권1호
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• pp.91-99
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• 2001

무당벌레(Harmonia axyridis)성충 더듬이에 분포하는 감각기를 주사전자현미경으로 관찰하였다. 무당벌레 성충 더듬이에서 형태적으로 크게 차이를 보이는 5종류의 감각기, $B\ddot{o}hm$, Basiconic, Chetiform, Trichoid 그리고 Coeloconic sensilla를 관찰할 수 있었다. $B\ddot{o}hm$ sensilla는 자루마디와 팔굽마디 기부안쪽의 등쪽면과 배쪽면에서만 관찰되었고, 이것은 분포된 위치로 미루어 더듬이의 움직임과 위치를 확인하는 자기반응감응성 감각기로 보여진다. Basiconic sensilla와 Chetiform sensilla는 형태적 차이에 의하여 3가지 subtype으로 나눌 수 있었으며, Trichoid sensilla는 암 수컷 더듬이 모두에서 더듬이 말단의 2마디에서만 확인되었다. 무당벌레 성충 더듬이에서 관찰된 sexual dimorphism은 더듬이 감각기의 분포와 종류가 있었는데 이것은 암컷과 수컷간의 더듬이 감각기의 분포가 다르게 나타났으며, 감각기의 다양성이 가장 높게 나타난 말단마디의 배쪽면에서 관찰된 Coeloconic sensilla는 수컷에서만 관찰되었고, Trichoid sensilla의 경우 수컷보다 암컷에서 더 많이 관찰되었다. 이러한 sexual dimorphism은 동종의 성상호간 통신에 이용되는 것으로 보여진다.

• 한국동물학회지
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• 제1권1호
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• pp.30-32
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• 1958

• 한국잠사곤충학회지
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• 제41권2호
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• pp.87-93
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• 1999

Under Light and Scanning electron microscope, the pupal morphology of mulberry silkworm Bombyx mori Linn. revealed the prothorax and metathorax, well developed mesothorax, less defined last pair of sporacle, well exposed prothoracic femora and wing pads approaching the anterior margin of Ab III. The important sex separating characters viz, wegiht, antennal elevations, intersegmental lines and genings have discussed. Further, two separate openings bursa copulatrix and ovipositional opening were observed, performing different functions in abult moth.