• Childhood Kidney Diseases
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• v.12 no.1
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• pp.1-10
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• 2008

Nucleic scids transfer the genetic information for serving a central biological purpose. The nucleic acids are polymers of nucleotides and they are mainly ribonucleic acid(RNA) and deoxyribonucleic acid(DNA). The nucleotides are stoichiometrically composed of five-carbon sugars, nitrogeneous bases, and phosphoric acids. The chemistry of nucleic acids and characteristics of different genomes are decribed for further study. Most of DNA genomes tend to be circular including bacterial genomes and eukaryotic mitochondrial DNA. Eukaryotic chromosomes in cells, in contrast, are generally linear. The ends of linear chromosomes are called telomeres. The genomes of different species, such as mammals, plants, invertebrates can be compared with the chromosome ends. The telomeric complex allows cells to distinguish the random DNA breaks and natural chromosomal ends. The very ends of chromosomes cannot be replicated by any ordinary mechanisms. The shortening of telomeric DNA templates in semiconservative replication is occurred with each cell division. The short telomere length is critically related to aging, tumors and dieases.

• Animal Systematics, Evolution and Diversity
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• v.6 no.1
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• pp.29-56
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• 1990

In the course of the study program of benthic invertebrates of the coastal shelves of Korean Peninsula, the shallow -water chitons (Mollusca : Polyplacophora) are studied based on the collections of the Korea Ocean Research and Development Insitute made between 1980 and 1983. A total of sixteen species belonging to the Orders Lepidopleurina and Ischnochitonina , are now recognized from Korean waters,of which the following two species are newly recorded ; Leptochiton (Leptochiton ) rugatus (Carpenter in Pilsbry), and Mopalia schrencki Thiele. Illustrations, description and complte synonymies are provided for each of them.

• Proceedings of the Korean Society of Fisheries Technology Conference
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• 2000.05a
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• pp.416-417
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• 2000

Chitin, a poly $\beta$-(1longrightarrow14)-N-acetyl-D-glucosamine, is best known as a cell wall component of fungi and as a skeletal materials of invertebrates. Chitosan is derived from chitin by deacetylation in the presence of alkali. Chitosan has been developed as new physiological materials since it possesses antibacterial activity, hypocholesterolemic activity and antihypertensive action. However, the actions of chitosan in vivo still remain ambiguous as the physiological functional properties because most animal intestines, especially the human gastrointestinal tract, do not possess enzyme such as chitosanase which directly degrade the $\beta$-glucosidic linkage in chitosan, and consequently the unbroken polymers may be poorly absorbed into the human intestine. Therefore, recent studies as chitosan have attracted interest for chitosan oligosaccharides, because the oligosaccharides process not only water-soluble property but also versatile functional properties such as antitumor activity, immune-enhancing effects, enhancement of protective effects against infection with some pathogens in mice and antimicrobial activity (Kingsnorth et al., 1983, Mori et al., 1997). (omitted)

• Proceedings of the Korean Society of Fisheries Technology Conference
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• 2001.10a
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• pp.147-148
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• 2001

Many people living in Asia countries, particularly Korea, Japan and China, have consumed very widely fresh seafood products, such as shrimps, oysters, mussels and other marine invertebrates and fishes, without any heating or cooking. A variety of Vibrio spp., including V. parahaemolyticus, V. cholera. V. vulnificus, and V. fluvialis, lives in these seafoods and cause great problems associated with human disease. A strong antimicrobial agent to effectively inhibit the growth of these pathogenic bacteria in in vivo or in vitro is urgently need for preventing fish and human diseases. (omitted)

• Korean Journal of Environmental Agriculture
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• v.26 no.3
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• pp.267-273
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• 2007

• The Korean Journal of Zoology
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• v.8 no.2
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• pp.80-84
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• 1965

본 실험은 몇 가지 해산 무척추동물, Crassostrea gigas (THUNBERG) , Musculus senhousia (BENSON), Adula atrata(LISCHKE), Littorina brevicula (PHILIPPI) 그리고 BALANUS amphitrite communis (DARWIN) 의 치사율에 대한 온도의 영향을 밝히고저 실시한 것이다. 1. 온도 35$^{\circ}C$와 -5$^{\circ}C$는 상기한 오종의 동물에 대하여 치명적이 아니었다. 2. 본 실험에서 오종의 치사율은 -2$0^{\circ}C$에서 가장 높았다. 3. 동일 온도일 경우 수중에서 보다는 공기 중에서 굴의 생존능력이 더 높았다. 4. 온도가 매우 높거나 낮지 않더라도 반복해서 처리하는 것은 해산 동물에 보다 치명적인 영향을 준다. 그 이유는 그들이 먼저 번의 상해를 회복할 만한 충분한 시간을 가질 수 없기 때문이다. 5. M.Senhousia 는 처음에는 B.amphitrite 보다 저항력이 강하지만 다음에는 B.amphitrite 보다 빨리 저항력을 잃는다. 6. 본 실험에서 얻은 치사율의 계열은 다음과 같다. M.senhousia > B.amphitrite> C.gigas> L.brevicula > A.atrata.

• Animal cells and systems
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• v.9 no.3
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• pp.113-122
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• 2005

A new species of free-living marine draconematid nematode, Dracogalerus koreanus n. sp., is described from the shallow subtidal coarse sediments and various invertebrates of Jeju Island, Korea. This is the first record of this genus from Korea. Dracogalerus koreanus n. sp. is morphologically most similar to D. cryptocephalus (Irwin-Smith) in having similar head shape (rostrum broadly rounded anteriorly) and eight cephalic adhesion tubes, but differs by the small number of rounded protuberances on the ventral side of non-annulated tail end (5 vs 6), small number of posterior subventral adhesion tubes in male (5-6 vs 8), intermingled somatic setae (5-6 vs absent), spicules (slightly curved and relatively thick vs strongly curved and very slender), and higher 'c' value in male (8.8 vs 7.5).

• Korean Journal of Microbiology
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• v.8 no.4
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• pp.141-150
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• 1970

As a part of taxonomical and ecological studies on the yeasts in marine environments, several kinds of yeasts were isolated from Zostera marina several invertebrates (penaeus, Meretrix and Neptunus) and surface sea water, which are collected at the two established sites of estuarine areas ; Dolsan isaland in Youchun district and Baiksu-ri in Youngkwang district. The obtained results can be summarized as follows. 1. Ascosporgenous Yeasts. Hansenula sp I and Hansenula sp II were isolated from Zotera marina and Hanse nular sp I from penaeus. 2. Asporogenous Yeasts. Trichoporon fermentans, Torulopsis, ernobii and Toruopsis dattia were isolated from Zostera marina, Candida krusei from Meretrix and Neptunus, Torulopsis pinus from surface sea waters, and Phodotorula aurantiaca from Penaeus. 3. More notable isolations of several species from Zostera marina than the other sources could be assumed as related to the higher sugar concentration of this plant.

• Molecules and Cells
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• v.43 no.2
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• pp.114-120
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• 2020

Drosophila hematopoiesis is comparable to mammalian differentiation of myeloid lineages, and therefore, has been a useful model organism in illustrating the molecular and genetic basis for hematopoiesis. Multiple novel regulators and signals have been uncovered using the tools of Drosophila genetics. A Runt domain protein, lozenge, is one of the first players recognized and closely studied in the hematopoietic lineage specification. Here, we explore the role of lozenge in determination of prohemocytes into a special class of hemocyte, namely the crystal cell, and discuss molecules and signals controlling the lozenge function and its implication in immunity and stress response. Given the highly conserved nature of Runt domain in both invertebrates and vertebrates, studies in Drosophila will enlighten our perspectives on Runx-mediated development and pathologies.

• Proceedings of the Korean Society of Fisheries Technology Conference
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• 2001.05a
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• pp.471-472
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• 2001

Recently many studies show that genetic characters can be used to provide unambiguous taxonomic discrimination when morphological characters are not practical for routine identification to species level (Bucklin et al., 1996, 1998; Lindeque et al., 1999). The internal transcribed spacer (ITS) regions of the nuclear ribosomal DNA are also one of appropriate markers for species-level studies because it contains sufficient diversity to address intra- and interspecific phylogenetic relationships in invertebrates (Odorico and Miller,1997; Schizas et al., 1999). (omitted)