• 한국자원식물학회지
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• 제18권2호
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• pp.302-308
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• 2005

본 연구는 금낭화 배우체의 형성과 배 발달특성에 관한 기초 자료로 활용하기 위해 수행되었다. 시원세포로부터 발달된 소포자 모세포는 화뢰의 길이가 1 mm일 때 감수분열을 하여 4면체형(tetrahedral) 4분자가 형성되었다. 4개의 소포자는 분리되어 각각 웅성배우체로 발달하였다. 대포자 모세포는 화뢰의 길이 $4{\sim}5\;mm$에서 관찰되었다. 대포자의 발달유형은 정상형(polygonum)이었으며, 배낭의 형태는 굽어있는 곡생배주(amphitropous)였다. 3개의 뚜렷한 반족세포는 배낭이 성숙한 후에도 퇴화하지 않고 남아있었다. 개화 전 자웅배우체는 충분히 성숙하였다. 개화 시에 수술과 암술의 길이는 거의 비슷하거나 수술이 0.5 mm 짧아서 자화수정에 적당한 구조를 가지는 것으로 나타냈다. 수정 후 배는 구형, 심장형을 거쳐 자엽배까지 발달하였으며, 종자 산포시 초기 자엽배를 가지고 있음을 알 수 있었다.

• 한국발생생물학회지:발생과생식
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• 제19권4호
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• pp.189-196
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• 2015

This study was examined the ovogenesis of Ussurian bullhead, Leiocassis ussuriensis and the morphological development of its larvae and juveniles and to use the results as basic information for the preservation of species and resource enhancement. For artificial egg collection, human chorionic gonadotropin (HCG) was injected at a rate of 10 IU per gram of fish weight. During breeding period, water temperature maintained at $24.5{\sim}26.5^{\circ}C$ (mean $25.0{\pm}0.05^{\circ}C$). The process of ovogenesis reached the two-cell stage in 50 minutes after fertilization. In 73 hours of fertilization the movement of the embryoid body became active state and the larvae began to hatch from the tail through the oolemma. Length of prelarvae were 6.33~6.50 mm long (mean $6.40{\pm}0.06mm$) just after hatching having yolk with their mouth not opened. After thirty eight days of hatching, juveniles were 30.6~32.5 mm long (mean $31.5{\pm}0.65mm$). The color was dark yellowish brown throughout the entire body, and the number of caudal fin rays developed to thirty six perfectly.

• International Journal of Industrial Entomology and Biomaterials
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• 제37권2호
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• pp.100-104
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• 2018

The rearing of black soldier flies in Korea is affected by seasonal factors such as temperature and sun light; for this reason, it requires a great deal of effort to rear and maintain black soldier flies during the winter. In this study, we investigated how starvation affects larval development. After hatching the larvae, they were fed for 5 or 10 d and then starved for a certain period to see how they recovered. The length and width of larvae were estimated to be 18.18 to 21.96 mm, 5.19 to 6.04 mm, respectively. Larvae survivorship to the pupal stage was significantly different between groups and periods of starvation. The groups of fed for 5 d then starved showed a high survival rate until 20 d starvation and then the survival of larvae rapidly decreased. The survival rate of the larvae was abruptly decreased for 20 d starvation in the groups of fed for 10 d and starved, and then gradually decreased until 60 d starvation thereafter. Our research attempted to influence larvae development through starvation and provides basic information on how to culture the black soldier fly effectively and economically throughout the year.

• 한국어류학회지
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• 제24권3호
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• pp.160-166
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• 2012

멸종위기 담수어인 모래주사의 종 보존을 위한 기초자료를 얻기 위해 난발생 및 초기생활사를 연구하였다. 2012년 5월 1일 전북 임실에서 포획된 성어를 이용하여 인공 수정시켰으며, 수정란은 구형의 분리침성란에 난경은 $1.8{\pm}0.14mm$였다. $23^{\circ}C$의 수온에서 29시간 후에 부화하였으며, 부화 직후 전기자어의 크기는 $2.2{\pm}0.48mm$였다. 부화 후 4일째 난황을 모두 흡수하여 후기자어기에 진입하였으며, 전장은 $3.6{\pm}0.55mm$였다. 20일이 지나자 지느러미 기조수가 정수가 되어 치어기로 이행하였으며, 전장은 $6.5{\pm}0.77mm$였다. 부화 후 60일이 지나자 두부와 체측에 나타나는 반문이 성어와 유사해졌으며, 전장은 $24.4{\pm}1.71mm$에 달하였다. 모래주사의 난발생 과정 및 초기생활사를 모래무지아과 어류들과 비교한 결과 수정란의 부화시간은 비교적 빨랐으며 부화 직후 전기자어의 크기도 작았다.

• 한국어류학회지
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• 제31권4호
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• pp.214-221
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• 2019

이 연구는 참마자 자치어의 골격발달을 관찰하여 유연종 간의 분류학적 연구 기초자료를 제공하고자 한다. 부화 직후 난황자어는 평균전장 8.10±0.02 mm (n=5)로 두개골의 액골과 부설골, 기저후두골이 골화하였고, 부화 후 6일째 중기자어는 평균전장 10.9±0.26 mm (n=5)로 두개골의 설악골, 접속골, 외익상골이 골화였으며, 부화 후 12일째 후기자어는 평균전장 12.2±0.55 mm (n=5)로 새개부의 간새개골, 견대부의 하후쇄골이 골화하였다. 부화 후 25일째 후기자어는 평균전장 16.1±0.27 mm (n=5)로 구개부의 상설골, 간설골이 골화하였고, 미골부에는 2개의 상미축골이 골화하였으며, 신경간극과 혈관간극이 골화하였다. 부화 후 40일째 치어는 평균전장 27.9±3.74 mm (n=5)로 미골부의 하미축골이 3개(1, 2+3, 4+5)의 형태로 융합하면서 모든 부위의 골격발달이 완성되었다.

• 한국작물학회:학술대회논문집
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• 한국작물학회 2022년도 추계학술대회
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• pp.33-33
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• 2022

Rice (Oryza sativa L.) is a widely studied domesticated model plant. Seed awning is an unfavorable trait during rice harvesting and processing. Hence, awn was one of the target characters selected during domestication. However, the genetic mechanisms underlying awn development in rice are not well understood. In this study, we analyzed the genes for awn development using a mapping population derived from a cross between the Korean indica cultivar 'Milyang23' and NIL4/9 (derived from a cross between 'Hwaseong' and O. minuta). Two quantitative trait loci (QTLs), qAwn4 and qAwn9 were mapped on chromosome 4 and 9, respectively, increased awn length in an additive manner. Through comparative sequencing analyses parental lines, LABA1 was determined as the causal gene underlying qAwn4. qAwn9 was mapped to a 199-kb physical region between markers RM24663 and RM24679. Within this interval, 27 annotated genes were identified, and five genes, including a basic leucine zipper transcription factor 76 (OsbZIP76), were considered candidate genes for qAwn9 based on their functional annotations and sequence variations. Haplotype analysis using the candidate genes revealed tropical japonica specific sequence variants in the qAwn9 region, which partly explains the non-detection of qAwn9 in previous studies that used progenies from interspecific crosses. This provides further evidence that OsbZIP76 is possibly a causal gene for qAwn9. The O. minuta qAwn9 allele was identified as a major QTL associated with awn development in rice, providing an important molecular target for basic genetic research and domestication studies. Our results lay the foundation for further cloning of the awn gene underlying qAwn9.

• 대한조선학회논문집
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• 제55권3호
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• pp.196-204
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• 2018

Present paper shows the basic design procedure for platform support vessel operating in open sea, and hull form development process. General design concept considering the operating mission, operating sea condition and shipping freight, etc. is explained shortly. For the hull form design, the initial hull form was designed based on the reference PSVs. The resistance and propulsion test results for the initial hull form with twin Azimuth thruster were analyzed and a few items for improvement were derived. At the next stage, main parameters including Length, Cp-curve, Cb, Lcb, etc. were changed totally for the hull form improvement. Furthermore, 3 different bulbous bows for the fore-body design to reduce the wave resistance and after-body design to reduce the residual resistance were carried out. The best hull form among the 3 fore-bodies with same after-body was selected through the comparison of wave resistance calculation results. Twin ducted Azimuth thruster with the smaller propeller diameter than the former were adapted to increase the propulsive efficiency. The final hull form with the twin Azimuth thruster was evaluated to satisfy more than the target design speed 14 knots in sea condition with sea margin 15% at the 5,000kW BHP through the model test in KRISO.

• 한국의류학회지
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• 제25권8호
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• pp.1524-1535
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• 2001

The purpose of this study was to establish a sizing system according to size and dimension whereby manufactured pants can be classified and develop men’s formal pants pattern based on the analysis of ready-made and educational pants pattern. The first, we surveyed the sizing and the basic pants patterns of the men’s ready-made wear companies, Secondly, through the survey data of the domestic men’ready-mad clothing industry, we proposed a new sizing system. Lastly, after compared three different types of ready-mad pants manufactured according to their patterns and an additional type of pants made after the educational pattern, the new men’s basic pants pattern were developed. The findings were as follows: 1. Survey of the domestic ready-mad garment industry showed that each company classified its own manufactured goods according to its own sizing system: moreover, they each used its own unique patterns which appeared to be resulted from a combination of two factors : the experience of a patterner and foreign know-how technology. 2. New sizing system was developed with 12 steps from size 74-88 to size 96-106 based on the high frequencies of the companies’3. New basic patterns for men’s formal pants were developed: Inseam length = 80cm, crotch line = H/4+4.6cm, pants ham = 23.5cm as basic lines and front waist girth =W/4+9.1cm as drafting line. 4. the superiority of the new basic patterns were been demonstrated by a high approval rate of the subjects who participated in testing.

• 한국발생생물학회지:발생과생식
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• 제19권1호
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• pp.25-31
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• 2015

We have launched an investigation for Embryonic Development, Larvae and Juvenile Morphology, of Buenos aires tetra in order to build basic data of Characidae and fish seeding production. We brought 50 couples of Characidae from Bizidduck aquarium in Yeosu-si, Jeollanamdo, from Korea on March of 2015. We put them in the tetragonal glass aquarium ($50{\times}50{\times}30cm$). Breeding water temperature was $27.5{\sim}28.5^{\circ}C$ (mean $28.0{\pm}0.05^{\circ}C$) and being maintained. The shape of fertilized egg was round shape, and it was adhesive demersal egg. The egg size was 0.63~0.91 mm (mean $0.74{\pm}0.07mm$, n=20). After getting fertilized egg, the developmental stage was gastrula stage, and embryo covered almost two-thirds of Yolk. Incubation was happened after 16 hours 13 minutes from gastrula stage, and the tail of juvenile came out first with tearing egg capsule. Immediately after the incubation, prelarvae had 3.78~3.88 mm length (mean $3.84{\pm}0.04mm$, n=5), and it had no mouth and anus yet. 34 days after hatching from the incubation, juvenile had 8.63~13.1 mm (mean $10.9{\pm}1.66mm$), and it had similar silver-colored body shape with its mother.

• 한국습지학회지
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• 제4권2호
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• pp.1-11
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• 2002

The morphology, seed germination, and life history of Salix nipponica were investigated in the wetland of the Nam-River, Jinju, Gyeongsangnam-do, Korea from 2000 to 2001 to provide the basic data necessary for riverine ecosystem restoration through understanding the growth characteristics of Salix nipponica. Salix nipponica had stomata on only lower side and stomata type was paracytic. Salix nipponica produced many small and light seeds. The seed number per mature ament was 1599.4, seed mass of 0.04 mg, and fertilization rate of 66.1%. Seed germination was little affected by light. Germination rate was high and mean germination time was short Under flooding condition, seeds were germinated normally and were viable after as much as 14 days of flooding. But there were no differences under various water depths on germination rates. Tree age was closely correlated with more stem diameter than tree height and there was no difference of growth rate between male and female tree. Growth rate was most rapid for 2 to 3 years after germination, and length growth was almost stopped for more than 11 years even though mass growth was done. Besides even a second-year indivisual was flowered.