• 제목/요약/키워드: Juvenile growth

검색결과 566건 처리시간 0.023초

사료의 $\alpha-cellulose$ 함량이 조피볼락 Sebastes schlegeli의 성장, 사료 효율 및 체성분에 미치는 영향 (Effects of Dietary $\alpha-cellulose$ Levels on the Growth, Feed Efficiency and Body Composition in Korean Rockfish, Sebastes schlegeli)

  • 이상민;이종윤
    • 한국양식학회지
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    • 제7권2호
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    • pp.97-107
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    • 1994
  • 사료의 $\alpha-cellulose$ 함량이 조피볼락의 성장, 사료 효율, 영양소 이용 효율 및 체조성에 미치는 영향을 조사하기 위해 209 전후의 조피볼락 치어를 대상으로 사료의 $\alpha-cellulose$ 함량이 $0\~20\%$가 되도록 총 5종의 실험 사료를 제조하여 10주간 사육 실험한 결과는 다음과 같다. $\alpha-cellulose$ 함량 $10\%$ 첨가구까지는 대조구와 유의차없이 성장 및 사료 효율이 양호하였고, $\alpha-cellulose$ $15\%$이상 첨가 실험구들은 유의하게 낮은 값을 보였다(P<0.05). 일간 먹이 섭취량은 $\alpha-cellulose$ $15\%$ 이상 첨가구에서 유의하게 높은 결과를 보였다(P<0.05). 영양소 축적효율 중 단백질 및 에너지 축적 효율은 $\alpha-cellulose$ $10\%$ 첨가구까지 대조구와 유의차 없이 좋은 결과를 보인 반면, 지질 축적 효율은 a-cellulose 함량이 증가함에 따라 계속 감소하였다 (P< 0.05). 전어체의 단백질 함량은 실험 구간별로 차이가 없었지만, 지질 함량은$\alpha-cellulose$ $10\%$ 첨가구에서 유의하게 높은 값을 보였다(P<0.05).

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넙치 전 암컷 집단의 생산을 위한 연구 IV. 성분화 기간 중 수온에 의한 성 결정 (Studies on the Production of All-Female Populations of Olive Flounder, Paralichthys olivaceus IV. Sex Determination by Water Temperature During Sex Differentation Period)

  • 김경길;방인철;김윤
    • 한국양식학회지
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    • 제9권4호
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    • pp.429-435
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    • 1996
  • 사육 수온이 넙치의 성비에 미치는 영향을 조사하기 위해 일반 넙치 및 자성발생성 2배체 넘치 자어를 대상으로 부화 후 35일(전장 1.2 cm)부터 100일(전장 12 cm)까지 사육 수온 18, 21, 24 및 $27^{\circ}C$로 나누어 2회 반복하여 실험하였다. 사육 수온이 높을수록 암컷의 비율은 낮게 나타나 사육 수온과 암컷 비율에 있어 역상관관계를 보였다. 자성발생성 2배체 실험군의 경우 $18^{\circ}C$에서 $94.4\%$의 암컷을 보인 반면 $27^{\circ}C$에서는 $57.6\%$로 나타나 암수비가 1 : 1이었다(P<0.01). 사육 수온에 따른 생존율은 일반 넙치 및 자성발생성 2배체 넙치 모두 18, 21, 24 및 $27^{\circ}C$ 순으로 높았으나 $27^{\circ}C$를 제외한 나머지 실험군은 유의차가 없었으며 $18^{\circ}C$를 제외한 나머지 실험군의 체중 성장은 유의차가 없었다(P>0.05).

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한국산 동사리의 산란습성과 난발생 및 초기발육과정에 대하여 (On the Spawning Behavior and the Development of Korean Eleotrid Fish, Odontobutis obscurus (T. et S.))

  • Ki Chul Choi;Chang Deog Jin
    • The Korean Journal of Ecology
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    • 제1권2호
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    • pp.44-48
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    • 1977
  • The spawning behavior and developmental pattern of the Korean eleotrid fish (Odontobutis obscurus) was investigated in one of the tributary of Han River. The spawining of this species begins on April and continues up to August, whereas, the spawning. of same species were between the end of June and the middle of July in Kyushu, Japan. August The spawning places were the margin of river, its the bottom composed of sand and pebble (Table 5). The velocity of water in the spawning places was 0-40cm/sec, and the depth of waters was 10-40cm. The egg was spawned on underside of stone in the spawning places with one or two folds and ellipsoid in shape, 3.4mm in long diameter and 2.0mm in short diameter. The yolk is 1.2mm in diameter and yellow in color. For hatching of the egg, it takes one month in, $16^{circ}C~19^{\circ}C$ water, in Japan, whereas it takes only 14 days in $20^{circ}C~30^{\circ}C$ wate rin the study area. The growth rate of larva and juvenile fish were as follows: new hatched larva is 45mm in length; after 5 days it became 5.0 to 5.5mm in length and 1.2 to 1.5mm in height after 20 days. it became 11.0mm in length and 2.3mm in length. The mean size of the mature female is 110mm in total length and larger 10mm than that of the same fish found in Japan.

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배추 유래 phytocystatin 유전자, Brcpi1의 분리 및 발현특성 분석 (Isolation and characterization of Brcpi1 gene encoding phytocystatin from chinese cabbage (Brassica rapa L.) seedlings)

  • 정유진;조용구;강권규
    • Journal of Plant Biotechnology
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    • 제36권4호
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    • pp.407-414
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    • 2009
  • A cDNA clone encoding phytocystatin was isolated from Brassica rapa seedlings, through rapid amplification of cDNA ends (RACE). This gene (name as Brcpi1; GenBank accession no.: EF079953) had a total length of 881 bp with an open reading frame of 609 bp, and encoded predicted polypeptide of 203 amino acid (aa) residues including a putative N-terminal signal peptide. Other relevant regions found its sequence included the G and PW conserved aa motifs, and the consensus LARFAV sequence for phytocystatins and the reactive site QVVAG. The BrCPI1 protein shared 95, 94, 81, 80 and 78% identity with other CPI proterins isolated from Brassica oleracea (BoCPI-1), Arabidopsis thaliana (AtCY SB), Glycine max (GmCPI), Oryza sativa (OsCYS-2) and Zea may (ZmCPI) at amino acid level, respectively. Southern blot analysis showed that Brcpi1 was a low copy gene. Expression pattern analysis revealed that Brcpi1 was a tissue-specific expressing gene during reproductive growth and strongly expressed at mature seedling stages. Furthermore, overexpression of Brcpi1 in transgenic Arabidopsis was enhanced tolerance to salt and cold stresses. Meanwhile the juvenile seedling of Brcpi1 transgenic plants was not affected by various concentrations ABA in MS medium. Taken together, the results showed that Brcpi1 functioned as a cysteine protease inhibitor and it exhibited a protective agent against diverse types of abiotic stress, which induced this gene in a tissue- and stress-specific manner.

턱에 발생한 석회화건막섬유종 : 증례보고 (Calcifying Aponeurotic Fibroma Occurring on the Chin: A Case Report)

  • 정연주;최영웅;신은아
    • Archives of Plastic Surgery
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    • 제35권1호
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    • pp.104-106
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    • 2008
  • Purpose: Fewer than 100 cases of calcifying aponeurotic fibroma have been reported in the literature since this entity was initially described by Keasbey in 1953 who called it calcifying juvenile aponeurotic fibroma. The tumor is a slowly growing, painless mass. In most cases the mass is poorly circumscribed and causes neither discomfort nor limitation of movement. Most lesions occur in children, with a peak incidence ages of 8-14 years. There is no evidence of any increased familial prevalence. Predilection sites are palm, finger, toe, but it also occurs in the wrist, forearm, elbow, upper arm, neck, abdominal wall, lumbar paravertebral area, leg and ankle. We herein describe a rare case of calcifying aponeurotic fibroma occurring on the chin with review of the literature. Methods: A 14-year-old male had painless, slowly growing mass(${\phi}2.5cm$) on a chin for a year. The tumor was excised elliptically under local anesthesia and the excisional site was repaired directly. Due pathological examination was processed. Results: Histological examination revealed an illdefined fibrous growth that extends with multiple processes into the surrounding tissue with centrally located foci of calcification. The tumor is composed of short spindled plump fibroblasts with round or ovoid nuclei separated by collagenous stroma, showing vaguely palisading pattern. Diagnosis of calcifying aponeurotic fibroma was conferred. Postoperatively, the patient did well, and the lesion had not recurred. Conclusion: Fewer than 100 cases of calcifying aponeurotic fibroma have been reported in the literature. The most common occurring sites are palm, finger & toe, but it has been reported in the wrist, forearm, elbow, upper arm, neck, abdominal wall, lumbar paravertebral area, leg and ankle. Two cases of calcifying aponeurotic fibroma occurring on the neck have been reported in the literature. To the authors knowledge, our case of calcifying aponeurotic fibroma occurring on the chin is the first to be reported.

노가리와 명태에 대한 형태학적 고찰 (Meristic And Morphometric Observations On Nogari And Alaska Pollack)

  • 김완수;허성회
    • 한국해양학회지
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    • 제13권2호
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    • pp.26-30
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    • 1978
  • 노가리는 명태, Theragrachalcogramma(PALLAS)의 미성어라고 오래전부터 알려져 왔으며 우리나라 수산자원보호령의 미성어 보호대책 규정에 의해 종래에는 그 어획이 금지되어 있었다. 그러나 수산당국은 자원학적 견지에서 노가리를 어획하여도 무방하다는 해석을 내려 1974년부터 노가리에 대한 어획금지규정을 폐기하였으며 현재까지 어획을 허용하고 있다. 명태는 우리나라 국민의 중요한 식량원이며 동해안에서 비교적 산업적 가치가 높은 데도 불구하고 이 집단에 대한 자원생물학적 지견과 자원의 변동법칙은 아직 잘 알려져 있지 않으며 일부 어민들은 심지어 노가리는 명태의 미성어가 아니라고 주장하고 있는 것이 현상이다. 명태는 개체 또는 집단으로서 넓은 변이성을 가진 어종이라고 알려져 있지만, 현금과 같은 격렬한 어업 압력에 과연 얼마나 견딜 수 있는가를 규명하는 일이 요청되고 있다. 본고에서는 노가리와 명태에 대해 몇가지의 형태학적 집단표징을 관찰하여 검토한 결과를 보고한다.

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남조류, Mastigocoleus sp.에 의한 한국산 참전보의 패각 괴사증 (Shell Necrosis of Haliotis discus hannai by Mastigocoleus sp. (Cyanophyta) in Korea)

  • 최상덕;윤장택;조용철
    • 한국양식학회지
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    • 제11권4호
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    • pp.465-474
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    • 1998
  • 참전복(Haliotis discus hannai) 양성과정중 치패단계에서 발생된 패각 괴사증의 조사결과는 다음과 같다. 괴사된 전복패각에서 간균 형태(rod type)와 이질세포를 갖는 남조류가 관찰되었다. 그러나 주사전자현미경(SEM)의 자료에 근거하면 패각과 사증의 원인생물은 천공성 남조류, Mastigocoleus sp.로 나타났다. 천공성 남조류에 감염된 전복의 패각은 녹색에서 회백색으로 탈색되었고, 4~6번째 호흡공은 부서지기 쉬운 상태가 되었다. 양성 60일 후, 패각 괴사증은 갈색의 작은 집락이 산재되어있는 호흡공에서 주로 발생하였으며, 양성 후 3년까지 지속되었다. 이러한 패각 괴사증은 바다 채롱식 양식장에서 보다는 육상 수조식 양식장에서 주로 발생하였으며, 참전복의 성장에 커다란 영향을 미친 결과 3년산 참전복의 각장이 16mm였다.

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The Panax ginseng Flowering Locus T Shows Age Specific Expression Pattern in Ginseng and Increases Root Length in Transgenic Arabidopsis

  • Mohanan, Padmanaban;Myagmarav, Davajargal;Zhang, Dabing;Kim, Yu-Jin;Yang, Deok-Chun
    • 한국자원식물학회:학술대회논문집
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    • 한국자원식물학회 2018년도 춘계학술발표회
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    • pp.17-17
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    • 2018
  • Panax ginseng Meyer is a perennial medicinal plant, the roots of which has been used in the traditional formulations in Oriental countries. To understand its floral transition, we isolated Flowering Locus T (FT) from ginseng, the bioinformatics analysis of PgFT has revealed a considerable homology to the higher plants, with the essential amino acids for FT function are conserved. The phylogenetic analysis has shown that the PgFT is belonged to the shrub classes of plants and closest kin to Jatropha curcas FT. The expression profiling from juvenile (2-year-old) were abundant in leaves as well as in root and was concentrated in the secondary leaflet and stem bottom in adult (4-year-old) ginseng plant tissues, moreover PgFT transcript displayed photoperiod dependent oscillation. The ectopic expression of PgFT in Arabidopsis thaliana, exhibit precocious flowering and several floral pathway integrators were up-regulated, interestingly their root length was increased in the transgenic seedlings. Therefore, we could conclude that PgFT encodes a florigen that acts as a key regulator in the flowering pathway in ginseng and hypothesize that, it might involve in the underground organ development as well. We believe our finding could provoke future studies on the physiology and development in P. ginseng.

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In Vitro 시스템에 의한 화호형성 (In Vitro Flowering System)

  • 류장렬;이행순;이광웅
    • 한국식물학회:학술대회논문집
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    • 한국식물학회 1987년도 식물생명공학 심포지움 논문집 Proceedings of Symposia on Plant Biotechnology
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    • pp.213-237
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    • 1987
  • In vitro flowering system may minimize the confounded influence of non-floral meristem parts of plants in studying the relationship of a given treatment and flowering responses. We have induced flower buds from plantlets regenerated from zygotic embryo-derived somatic embryos of ginseng, which circumvented the normal 2-year juvenile period before flowering. The result suggests that the adulthood of ginseng root explants in the experiment previously conducted by Chang and Hsing (1980; Nature 284: 341-342) is not prerequired to flowering of plantlets regenerated through somatic embryogenesis. We have also induced flower buds from elongated axillary brandches from cotyledonary nodes by culturing ginseng zygotic embryos, seedlings, and excised cotyledonary nodes. It was found that 6-benzyladenine (BA) supplemented to the medium was essential for flowering, whereas abscisic acid (ABA) was inhibitory. Gibberellic acid(GA3) was also required for flowering when ABA was present with BA in the medium. The results suggest that cytokinins, gibberellins, and inhibitors play primary, permissive, and preventive roles, respective-ly, in the induction of flowering of ginseng. Tran Thanh Van (1980; Int. Rev. Cytol., Suppl. IIA: 175-194) has developed the "thin cell layer system" in which the induction of shoots, roots, or flower buds from epidermal layer explants were controlled by culture conditions and exogenous growth regulators in the medium, Utilizing the thin cell layer system, Meeks-Wagner et al. (1989; The Plant Cell 1: 25-35) have cloned genes specifically expressed during floral evocation. However, the system is too tedious for obtaining a sufficient amount of plant materials for biochmical and molecular biological studies of flowering. We have developed a garlic callus culture system and one obvious advantaging over the thin cell layer system is that an abundant cells committed to develope into flower buds proliferate. When the above cells were compared by two-dimensional gel electrophoresis with those which have just lost the competence for developing into flower buds, a few putative proteins specific to floral evocation were detected. The garlic callus culture system can be further explored for elucidation of the molecular biological mechanism of floral evocation and morphogenesis.hogenesis.

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A Study on the Actual Conditions of Brassiere Wearing for Girl Students

  • Sohn, Hee-Soon;Cha, Su-Joung
    • 패션비즈니스
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    • 제9권6호
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    • pp.12-28
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    • 2005
  • The purpose of this study is to help develop high quality brassieres with functionality and comfort, fitting adolescents' physical features during their growth period. This study conducts a comparative analysis of juvenile brassiere and adult brassiere to identify the problems of brassieres in the market. The raw data for this study was processed by SPSS 10.1. The results of this study are summarized as follows: 1. The results of this survey show that the girls' satisfaction of their breasts has correlations between breast protrusion degree and volume. The girls think that if they have protrusive breasts their breast volume is big, and their breast satisfaction level shows high. 2. The results show that the objective of brassiere wearing is to prevent breasts sag and rupture, make good breast shape, balance their entire body shape, and make beautiful outer garment line. Brassiere functions are to prevent jiggle of breasts, make a good body line, and cover the nipples. For the grader school students, they are wearing brassiere to make a good balanced body and as their breasts developed, they are wearing brassiere for beautiful body shape not just to cover up their breasts. 3. In regard to brassiere cup size recognition, as students have higher grade at school, they have better recognition abouxt their cup size. As they are better aware of their cup size, they have better satisfaction with their cup size. Therefore, choosing the right size of brassiere for their bust is very important. 4. Girl students' brassiere preference shows that 317 students (56.9%) prefer white for brassiere colors, following pink and flesh color. Their most preferred brassiere material is cotton (354 people, 63.6%) because cotton is not sensitive even for weak skin. For brassiere style, 273 students (49%) prefer round style, following spots and mold. Their most preferred brassiere style is stake. In addition, brassiere should not press their breasts because their breasts are developing during puberty period.