• Polymer(Korea)
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• v.33 no.2
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• pp.104-110
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• 2009

Demineralized boneparticle (DBP) has been widely used as and a powerful promoter of new bone growth. In this study, DBP sponges were chemically crosslinked and characterized for the potential application of tissue engineered scaffolds. The DBP sponges prepared by crosslinking with EDC. 0.1, 0.2 or 0.3% pepsin was applied to DBP dissolved in 3% (v/v) acetic acid aqueous solution for 48 hrs. The prepared sponges were crosslinked by 1, 5, 10, 50 or 100 mM of EDC solution concentration and then were lyophilized. The DBP sponges were characterized by SEM, FT-IR and DSC and analyzed in terms of their porosity and water absorption ability. The cellular viability and proliferation were assayed by MTT assay. Our investigation revealed that 0.2$\sim$0.3% of pepsin and 50$\sim$100 mM of EDC produced DBP sponges with good physical characteristics. In conclusion, DBP sponge prepared under these conditions is potentially useful for the applications of tissue construction.

• Korean Journal of Microbiology
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• v.50 no.2
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• pp.152-157
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• 2014

The aim of this study was to investigate the bacterial community inhabited in Callyspongia elegans. Marine bacteria were isolated from the marine sponge C. elegans using marine agar. The resulting 112 isolated pure cultures were then used for further study. They were characterized by determining morphological characteristics through Gram's staining and morphological observation. The colony pigments of bacterial isolates were characterized as yellow, brown, ivory, and white. Thirty-seven strains were found to be Gram-positive and 75 strains were Gram-negative. Seventy-nine strains were coccus-shaped, while 16 strains were rod-shaped. On the basis of the results of the comparative analyses of 16S rDNA gene sequences, the 112 isolated bacteria were divided into 5 major groups: Alphaproteobacteria (39%), Gammaproteobacteria (22%), Actinobacteria (14%), Fimicutes (9%), and Bacteroidetes (6%). It is strongly suggested that fifteen isolates are candidates for a new genera or species, based on the analyses of 16S rDNA gene sequences.

• Transactions of the Korean hydrogen and new energy society
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• v.13 no.3
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• pp.197-203
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• 2002

The main emphasis of this study was to find an new hydrogen absorbing alloy such as Mg-Ti-Ni-H systems, and to investigate their hydrogenation properties. ($Mg_9Ti_x$)-10, 20wt%Ni-Hx systems were prepared by hydrogen induced mechanical alloying(HIMA) using Mg and Ni chips and sponge Ti. The particles synthesized were characterized by X-ray diffraction, and their morphologies were observed by means of scanning electron microscopy(SEM) with energy dispersive spectrometry (EDS). In addition, the crystal structures were analyzed in terms of their bright-/ dark field images and the selected area diffraction pattern(SADP) of transmission electron microscopy(TEM).

• Journal of the Korean Society of Clothing and Textiles
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• v.32 no.4
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• pp.598-607
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• 2008

Bast fibers were applied for various usages from fabrics to household care products long time ago. In this study, we investigated the physical characteristrus of water retted & chemically rotted fibers of Yucca, New Zealand hemp, Corn, Kuzu vine, Indian mallow, and Mulberry paper that have been harvested by domestic cultivation. Water retting is more effective than chemical rotting for six kinds of plant fibers. When all fibers were rotted chemically with 1% sodium hydroxide, only Kuzu vine and Indian mallow were retted. Indian mallow, Yucca, New Zealand hemp, and Com fibers have higher tensile strength than any other fibers. The crystallinity of Kuzu vine, Indian mallow, Yucca, New Zealand hemp, and Corn was as low as 60% but Yucca, New Zealand hemp were flexible. Yucca had fewer lumina whereas New Zealand hemp more lumina in cross sectional shape. Especially com fibers have a structure like sponge, and Indian mallow had a net shape. The longitudinal section of New Zealand hemp showed smooth and long shape. Mulberry paper was proved to be short and thin, which is quite appropriate for making paper. In this study, we found that plant fibers for living material could be used for cloth materials.

• Journal of the Ergonomics Society of Korea
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• v.6 no.1
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• pp.41-44
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• 1987

Researches were made on foot-warming, anti-bacteria and deodorant treatment. Feet, the very important organ to human body, perspire much and their temperature is lower than those of other parts. Hence, keeping feet warm, sanitary and deodorant is the area of this study. Latex sponge of activated carbon, impregnated open cell foam, treated with Vikol DZ-anti-bacteria finishing agent, was developed and tested for warmth-keeping by KSK 0560 test method and for sanitization by AATCC 90 HALO test method and for deodorization by wearing tests. The results show that the new developed latex spongee has warmth-keeping ratio of 2.5 times higher than that of the conventional spong and it has an excellent anti-bacteria effect. Actual wearing function tests also show that it improves significantly the performance of deodorization, sanitization, warmth-keeping and bulkiness.

• Animal Systematics, Evolution and Diversity
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• v.18 no.2
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• pp.219-231
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• 2002

A taxonomic study of the marine sponges was conducted with the materials collected from Gageodo Island (Sohuksando), Korea from August 1999 to July 2001. The sponges were identified into 35 species, 23 genera, 16 families, six orders, two subclasses and a class. Among them, two of Polymastia murrayi Burton, 1959 and Clathria (Thalysias) spicata Gray, 1924, are newly recorded to Korean fauna, and Stylocordyla korenna n. sp. is new to science.

• Animal Systematics, Evolution and Diversity
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• v.20 no.2
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• pp.161-170
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• 2004

A taxonomic study on the marine sponges was conducted with material collected by SCUBA diving from Ulleungdo Island, Korea during July 2001 to August 2003. They were identified 19 species belonging to 14 genera in 12 families of six orders in two classes identified. Among them, Haliclona (Reniera) permollisimilis Hoshino, 1981 is newly recorded to the Korean fauna and Geodia ulleungensis n. sp. is new to science.

• Journal of Biomedical Engineering Research
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• v.15 no.3
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• pp.275-280
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• 1994

In the case of the image reconstruction from unknown projection data such as imaging the object with opaque obstructions, conventional reconstruction algorithms may reconstruct a degraded image. In this paper, a new method for the estimation of the unknown projection data based on known projection data and the bandwidth of projection data is proposed. The proposed method successfully estimates the unknown projection data through iterative transformation between projection space and frequency space using the known projection data and the bandwidth of the projection data. Computer simulation shows that the proposed method significantly improves image quality and convergence behavior over conventional algorithms. In addition, the proposed method is successfully applied to ultrasound attenuation CT using a sponge phantom.

• Proceedings of the PSK Conference
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• 2001.04a
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• pp.90-94
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• 2001

Wondonins A and B, aromatic alkaloids of an unprecedented skeletal class have been isolated form and association of the sponges Poecillastra wondoensis and Jaspis sp. In addition, four novel bromotyrosine-derived metabolites, psammaplins $A_1$ and $A_2$, aplysinellins A and B, have been isolated from the tropical sponge Aplysinella rhax. The structures of these compounds have been determined on the basis of combined chemical and spectral analyses. The new compounds exhibited significant cytotoxicity and antiangiogenic activity as well as inhibitory activities against farnesyl protein transferase and leucine aminopeptidase. In addition to these compounds, several bioactive metabolites have been isolated from sponges of Korean and tropical waters.

• Animal Systematics, Evolution and Diversity
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• v.28 no.4
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• pp.221-229
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• 2012

Paranebalia longipes (Willemoes-Suhm, 1875) is cosmopolitan and has been usually found in the algal and sponge debris on the sandy mud substrates. This species can be clearly distinguished from other species of Paranebalia by the presence of serration on posterior margin of pleopods, the number of articles on antennule and antenna, and number of teeth on flange of antennule fourth article. The genus Paranebalia is new to Korea. In this paper, we provide detail descriptions of the diagnostic characteristics and illustrations of the P. longipes. Additionally, type locality and world distribution of the genus Paranebalia are provided.