• The Korean Journal of Zoology
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• v.19 no.3
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• pp.123-138
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• 1976

Isozymes and chromosomes of Bufo bufo and B. kangii were studied by starch gel electrohporesis and bone marrow air-drying method. Twently-three enzymes and nonenzymatic proteins in Bufo species collected in Korea provided a basis for the estimating the proportion of polymorphic loci in the genum. Of 23 loci controlling the proteins examined, 26% and 17$% were polymorphic in B. bufo and B. kangii, respectively. In B. bufo, 4 loci had 3 alleles and no loci had more than 2 alleles in B. kangii. Both species had same karyotypes with 22 chromosomes except one pair of chromosome which had sat-chromosomes in B. bufo karyotypes. The genetic similarity was approximately 0.5.

• Korean Journal of Ichthyology
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• v.19 no.3
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• pp.253-256
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• 2007

The chromosome numbers of two species (Culter brevicauda and Erythroculter erythropterus) of Korean Cultrinae are investigated. In two species, the mitotic chromosomes from 24 groups with two chromosomes each indicated that it is a diploid. Their karyotypes and total length of chromosomes were slightly different from each other. The karyotype of C. brevicauda and E. erthropterus is 2n=48 (7M+10SM+7ST), FN=96 and 2n=48 (6M+10SM+8ST), FN=96. Observed chromosomes of C. brevicauda and E. erythropterus ranged from 5.4 to $2.2{\mu}m$ and 6.1 to $2.3{\mu}m$ in length, respectively.

• Korean Journal of Ichthyology
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• v.29 no.2
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• pp.89-93
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• 2017

For the karyotype analysis of Liobagrus hyeongsanensis, an endemic Korean torrent catfish, ten females and five males were used from Yangbuk-myeon, Gyeongju-si, Gyeongsangbukdo, Korea. The diploid number of chromosomes was 42, and its karyotype consisted of 30 metacentrics and 12 submetacentrics; 84 FN (fundamental number), with having no polyploidy and sexual dimorphism. The chromosome number was the same as other closely-related species, L. mediadiposalis and L. somjinensis, but their karyotypes showed a clear difference by species. Such result may be related to chromosomal rearrangements by Robertsonian rearrangement with geographical isolation.

• The Korean Journal of Zoology
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• v.24 no.3
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• pp.163-171
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• 1981

Chromosome aberrations induced by ENU and MNU were investigated in CHO cells at various doses and times after treatment. The results obtained were as follows: The frequency of chromosome aberrations induced by ENU and MNU drastically depends on the length of the post-treatment period and the concentration of these chemicals. In ENU-treated groups, the major type of aberration was chromatid deletions in earlier samples but the frequency of chromatid exchanges increased with time, revealing, predominant type at 24 hours after treatment with $10^-3$ M. In MNU-treated groups, chromatid deletions were also major type but frequency of chromatid exchanges were predominant from 12 hours after treatment with $10^-4$ and $10^-5$ M.

• The Korean Journal of Nuclear Medicine
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• v.32 no.6
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• pp.525-533
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• 1998

Purpose: Radiation adaptive response in human peripheral lymphocytes and mouse bone marrow cells was investigated using both metaphase analysis and micronucleus assay. We assessed the correlation between both tests. Materials and Methods: Two groups of the human peripheral lymphocytes and mouse bone marrow cells were exposed to low dose (conditioning dose, 0,18 Gy) or high dose (challenging dose, 2 Gy) ${\gamma}$-rays. The other 4 groups were exposed to low dose followed by high dose after several time intervals (4, 7, 12, and 24 hours, respectively). The frequencies of chromosomal aberrations in metaphase analysis and micronuclei in micronucleus assay were counted. Results: Chromosomal aberrations and micronuclei of preexposed group were lower than those of the group only exposed to high dose radiation. Maximal reduction in frequencies of chromosomal aberrations were observed in the group to which challenging dose was given at 7 hour after a conditioning dose (p<0.001). Metaphase analysis and micronucleus assay revealed very good correlation in both human lymphocytes and mouse bone marrow cells (r=0.98, p<0.001 ; r=0.99, p=0.001, respectively). Conclusion: Radiation adaptive response could be induced by low dose irradiation in both human lymphocytes and mouse bone marrow cells. There was a significant correlation between metaphase analysis and micronucleus assay.

• Korean Journal of Plant Taxonomy
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• v.39 no.1
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• pp.42-47
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• 2009

In this study, the somatic chromosome of 14 taxa of Korean Galium L. were investigated. Among them were a few taxa for which the somatic chromosome number was determined for the first time. The somatic chromosome numbers of Korean Galium L. were 2n = 22, 24, 44, 48, 66, 72, 77, 88 and so basic chromosome numbers were x = 11 or 12. Those taxa having the basic chromosome number x = 11 showed polyploidy, including diploid, tetraploid, heptaploid, and octoploid. Tetraploid and hexaploid can be observed in those taxa with the basic number x = 12. The eleven taxa reported 11 for the first time are G. spurium var. echinospermon (Wallr.) Hayek (2n = 44), G. gracilens (A. Gray) Makino (2n = 22), G. pogonanthum Franch. & Sav. (2n = 22, 44), G. trachyspermum A. Gray (2n = 22, 44), G. japonicum (Maxim.) Makino & Nakai (2n = 77), G. trifloriforme Kom. (2n = 44), G. dahuricum Turcz. var. dahuricum (2n = 48, 72), G. dahuricum var. tokyoense (Makino) Cufod. (2n = 22), G. kinuta Nakai & Hara (2n=66), G. verum var. trachycarpum for. nikkoense (Nakai) Ohwi (2n = 44), G. verum var. asiaticum for. pusillum (Nakai) M. Park (2n = 44). The taxa with the same chromosome numbers as previously reported ones were G. boreale L. (2n=22) and G. verum var. asiaticum Nakai for. asiaticum (2n = 44). The chromosome number of G. trifidum L. (2n = 22) was different from the previous report. Two infraspecific taxa of G. dahuricum showed differences in their basic chromosome numbers (x = 11 for G. dahuricum Turcz. var. dahuricum and x = 12 for var. tokyoense (Makino) Cufod. The somatic chromosome number for G. dahuricum Turcz. var. dahuricum was found to be 2n = 48 (tetraploid) or 72 (hexaploid), while that of G. dahuricum var. tokyoense (Makino) Cufod. was found to be 2n = 22 (diploid). Therefore, basic chromosome numbers for members of the genus Galium can be used as valuable characters in delimiting infrageneric sections and investigating interspecific relationships.

• The Korean Journal of Nuclear Medicine
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• v.28 no.1
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• pp.133-140
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• 1994

Recently, there are many considerations and studies on biological effects of radiations in radiation workers, as well as in accidentally or therapeutically irradiated persons. The most practical and reliable method of dosimetry for radiation accidents is the scoring of gross chromosomal aberrations in human lymphocytes (Ydr) as a biological dosimetry. By the way, although usual doses of $^{131}I$ administered therapeutically for thyroid cancer are ranging from 100 mCi to 200 mCi, there are differences of absorbed doses and Ydr, ranging from 0.004 to 0.04, on equally administered $^{131}I$ due to variations in metabolic characteristics, stage of tumors and physical status of subjects. In this study, We exert to obtain the dose-response relationships of $^{131}I$, as a good guide to evaluating acute effects of accidental irradiations and radiation induced leukemia or solid tumor, by in vitro induction of chromosomal aberrations. we studied the relationship between radiation dose (D) and the frequency of chromosomal aberrations (Ydr) obserbed in peripheral lymphocytes that were irradiated in vitro with $^{131}I$ at doses ranging from 0.05 to 6.00 Gy. By scoring cells with unstable chromosomal aberrations (dicentric chromosomes and ring chromosomes) we obtained this linear-quadratic dose response equation Ydr=0.064351 $D^2$-0.13143 D+0.045684 This dose-response relationship may be useful for evaluating acute and chronic $^{131}I$ induced biological effects.

• Proceedings of the Korean Statistical Society Conference
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• 2003.10a
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• pp.325-329
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• 2003

한우 6번 염색체 유전자 지도에서 QTL (quantitative trait loci) 분석을 실시하여 선별된Locus 값을 순열검정(Permutation Test)을 이용하여 유의성 검정을 실시하였다. 한편, 우수경제형질 DNA marker들을 K-평균 군집법을 실시 파악하였다. 이들 QTL과 K-평균법에 의해 한우의 염색체 6번 ILSTS035의 우수 DNA marker 235번을 선별하였다. 선별된 DNA Marker 235번을 출품우에 적용하여 Bootstrap 방법을 이용하여 신뢰구간을 구하여 검정하였다.

• Proceedings of the Korean Institute of Intelligent Systems Conference
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• 1996.10a
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• pp.306-309
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• 1996

본 논문에서는 유전자 알고리즘을 이용하여 퍼지 제어기를 위한 최적 소속함수와 제어 규칙들을 자동으로 생성하는 방법을 제안한다. 제안한 방법은 효과적인 염색체 암호화 방법을 이용하여 소속함수의 표현 해상도가 증가하여도 소속함수의 언어항의 개수를 일정하게 유지하여 제어 규칙을 표현하는 염색체의 길이가 크게 늘어나지 않도록 한다. 또, 소속함수의 언어항의 개수가 서로 다른 염색체에 대해서도 개선된 교배 및 돌연변이 연산자를 이용하여 효과적으로 유전자 연산을 적용할 수 있게 한다. 본 논문에서는 제안된 방법을 퍼지 제어기의 자동 생성 방법의 평가 문제로 널리 이용되는 트럭 후진 주차 문제에 적용하여 성능을 평가한다.

• Journal of Sericultural and Entomological Science
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• v.3
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• pp.59-60
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• 1963

It was prved by the author that : 1. The Smear Method with the buds of mulberry just before sprouting, can be used as one of the best methods in observation of the chromosome number. 2. The chromosome number of the Korean native mulberry is 28 in all (2n=28). 3. Triploid in mulberry can never occur under natural weather condition.