• 수산해양교육연구
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• 제23권3호
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• pp.410-424
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• 2011

품질이 보다 우수한 토마토 홍합 통조림을 제조하기 위하여, 최적조미조건을 관능검사를 통하여 설정하였으며, 홍합을 자숙한 후 301-3호관에 충전 밀봉하여 $118^{\circ}C$ 에서 Fo값이 8-12분이 되도록 토마토 홍합통조림을 제조하여 각 살균 조건별 시료에 대하여 내용물의 이화학적 성질의 변화 및 관능적 변화를 조사하였으며, 아울러 Fo 값이 8분인 토마토 홍합을 90일간 저장하연서 저장 중 품질변화에 대하여 살펴보았다. 1. Fo값 8, 10, 12 인 토마토홍합 통조림을 제조하여 각 살균 조건별로 가열처리에 의한 토마토 홍합 통조림의 품질차이를 조사한 결과를 요약하면 다음과 같다. 즉, 살균조건별 pH의 변화는 거의 없었으며, VBN은 열처리 정도에 따라 상당량 증가하였다. 시료 홍합 통조림의 정미성분 중 유리아미노산은 Fo 값이 증가할수록 약간씩 증가하였다. 총아미노산과 유리아미노산의 주요 아미노산은 glutamic acid 및 aspartic acid 이었다. 엑스분 중의 주요 무기질 성분은 Na, K, P 및 Mg이었으며 Fo값이 증가할수록 상당량 감소하였다. 조직감 면에서는 고온에서의 열처리로 인한 조직의 변화보다는 가열 및 가압에 따든 수분의 유출로 인해 조직이 단단해지는 것으로 나타났다. 각 살균 조건별로 관능검사를 실시한 결과 색조, 냄새, 맛 및 조직감 등 시료간의 관능검사 점수가 차이가 나지 않았고, panel member 들이 관능적 차이를 구별하기 힘들다는 의견이 지배적이었다. 따라서 살균원가가 가장 저렴하고 상업적 살균 조건에도 만족되는 Fo 값 8분인 제품을 생산하는 것이 바람직하다고 판단되었다. 2. Fo 값 8분으로 제조한 토마토 홍합통조림의 저장 중 품질변화를 조사한 결과를 요약하면 다음과 같다. 즉, 수분 (78.7~79.9%), 조단백질 (14.9~15.6%), 조지방(2.3~2.6%) 및 조회분(2.1~2.3%) 함량은 저장기간에 따른 변화가 거의 없었다. 또한 휘발성 염기질소 함량도 10.9~11.7mg/100g 으로 큰 차이는 보이지 않았다. 명도(L값 32.3~37.5)의 경우 저장 중 차이는 거의 없었으나, 적색 (a값, 18.3~6.5) 및 황색도(b값, 18.0~17.0)의 경우 저장기간이 길어질수록 점차 감소하였다. 한편, 육 색깔의 갈변도(${\Delta}E$값, 66.6~64.2)는 저장기간에 따른 차이는 거의 없었다. 지질의 산화정도를 알 수 있는 TBA값은 제조 직후 0.099에서 저장 90일에 0.123으로 증가하였다. 저장 중 토마토 홍합 통조림의 아미노 질소의 함량은 미미하나마 증가하였다. 유리아미노산의 총량은 저장 90일이 920.1mg/100g 으로 가장 높았으며, 주요 유리아미노산은 glutamic acid, taurine asparagine glycine 등 이었다. 토마토 홍합의 무기이온성분은 Na 및 K가 가장 많았으며, 다음이 P, Mg 및 Ca의 순 이었다. 관능검사에서 색/ 냄새 및 조직감의 평가에서는 저장기간에 따른 차이가 거의 없었으나, 맛 및 종합평가에서는 90일 저장한 토마토 홍합 통조림이 그 값이 가장 높았다.

• 한국패류학회지
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• 제21권1호
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• pp.25-31
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• 2005

The embryos of marine bivalves have been commonly used in bioassays for the quality assessment of marine environments. Although several standard protocols for developmental bioassay with bivalves have been already proposed, there have been few trials for applying these protocols in environmental assessment, or for developing new protocol with Korean species. So, there is a strong need to establish the standard bioassay protocols using bivalves commonly found in Korean waters. Prior to developing a new protocol, it is essential to know the optimum conditions for the reliable bioassay procedures. Here, we established the purpose of this study to determine the optimum bioassay conditions for successful development of a common mussel, Mytilus galloprovincialis. The conditions considered as critical for developmental bioassay, and determined in this study were; (1) temperature, (2) salinity, and (3) initial density of embryo. The optimal temperature for developmental bioassay of M. galloprovincialis was determined as $15^{\circ}C$. At this temperature, the required time for the embryo to become veliger larva was 48 hr. The acceptable range of salinity for the embryotoxicity test using M. galloprivincialis was from 30 to 35 psu, which was narrower than that of the natural habitat of adult populations. The optimum density of embryo at the beginning of bioassay was 100 embryos/ml. Over this density, the proportion of normally developed larvae decreased significantly. The results obtained in this study will serve as a basis for preparation of the standard bioassay protocol using embryo of M. galloprovincialis.

• 한국해양바이오학회지
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• 제7권2호
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• pp.58-70
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• 2015

Injectable RGD-bioconjugated Mussel Adhesive Proteins (RGD-MAPs) composite hydroxypropyl methylcellulose (HPMC) hydrogels provide local periodontal tissue for bone filling in periodontal surgery. Previously we developed a novel type of injectable self-supported hydrogel (2 mg/ml of RGD-MAPs/HPMC) based porcine nano hydroxyapatite (MPH) for dental graft, which could good handling property, biodegradation or biocompatibility with the hydrogel disassembly and provided efficient cell adhesion activity and no inflammatory responses. Herein, the aim of this work was to evaluate bone formation following implantation of MPH and collagen membrane in rabbit calvarial defects. Eight male New Zealand rabbits were used and four circular calvarial defects were created on each animal. Defects were filled with different graft materials: 1) collagen membrane, 2) collagen membrane with MPH, 3) collagen membrane with bovine bone hydroxyapatite (BBH), and 4) control. The animals were sacrificed after 2 and 8 weeks of healing periods for histologic analysis. Both sites receiving MPH and BBH showed statistically increased augmented volume and new bone formation (p < 0.05). However, there was no statistical difference in new bone formation between the MPH, BBH and collagen membrane group at all healing periods. Within the limits of this study, collagen membrane with MPH was an effective material for bone formation and space maintaining in rabbit calvarial defects.

• 한국환경독성학회:학술대회논문집
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• 한국환경독성학회 2001년도 추계심포지움 및 학술발표회:환경오염의 생체지표를 이용한 위해성 평가의 최근 기법
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• pp.78-78
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• 2001

• 한국수산과학회지
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• 제25권3호
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• pp.165-170
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• 1992

1. 우리나라의 강원도 죽변, 경북 영덕, 경남 일광면, 의창군, 충무, 삼천포와 일본의 암수현 대퇴만, 복정현 포저만, 신내천현 횡수하만의 호하대에 서식하는 진주담치를 채집하고, 패각의 내부형태에 관해 조사하였다. 2. 각고에 대한 전폐각근흔 길이의 비율을 조사한 결과 평균치가 가장 큰 것은 경북 영덕산으로 62.47이었으며, 가장 작은 것은 의창산으로 54.17이었다. 이 값은 유럽의 남방종(Mytilus galloprovincialis)의 값 66.06과 유사하며, 유럽 북방종(Mytilus edulis)의 값인 94.79와는 큰 차이가 있음을 알 수 있었다. 3. 각고에 대한 교판길이(hinge plate length)의 비율을 조사한 결과 평균치가 가장 큰 것은 죽변 산으로 61.31이었으며, 가장 작은 것은 일본 대퇴산으로 56.15였다. 이 값은 유럽 남방종(M. galloprovincialis)의 값 59.39와 유사하며, 유럽 북방종(M. edulis)의 값 84.80과는 큰 차이가 있음을 알 수 있었다. 4. 이상의 연구에서 우리나라와 일본 난류역연안에 서식하는 진주담치는 그 패각의 내부형태적 특징에서 지중해 연안, 즉 유럽 남방종인 Mytilus galloprovincialis와 동일한 사실이 판명되었다.

• 한국수산과학회지
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• 제55권6호
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• pp.875-885
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• 2022

This study was performed to confirm the optimal extraction method for antimicrobial peptides from the Hard-shelled mussel. Extractions were performed with two processes including 1% HAc/boiling and 1% HAc/non-boiling methods and used extracts for the comparison of the antimicrobial activity, protease stability, action mechanism, AU-PAGE (acid-urea PAGE), and HPLC chromatograms. 1% HAc/boiling extract showed potent antibacterial activities both against Gram-positive and negative bacterium but 1% HAc/non-boiling extract showed antibacterial activity only against Gram-positive bacteria. Treatment of 1% HAc/boiling extract with proteases retained almost antibacterial activity against B. subtilis, but abolished significant antibacterial activity against E. coli D31. Only 1% HAc/boiling extract showed two discrete clearing antibacterial zones including slow migrating and rapid migrating zones. Both extracts showed strong DNA-binding ability but did not show bacterial membrane permeabilizing ability. In comparison of the chromatogram obtained from C₁₈ or cation-exchange HPLC, the eluted peaks from 1% HAc/boiling extract showed high hydrophobic property or absorbance compared to 1% HAc/non-boiling extract, respectively. The concentration of the purified antimicrobial peptide was also higher in 1% HAc/boiling extract than in 1% HAc/non-boiling extract. Our results suggest that the effective extraction condition for antimicrobial peptides from marine invertebrate is boiling process in a weak acetic acid solution (1%).

• Environmental Engineering Research
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• 제19권4호
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• pp.375-380
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• 2014

Macro fouling due to blue mussels (Mytilus edulis) has affected negatively on the operation efficiency and eventual system failure of offshore structures and coastal power stations. A certain range of chlorine (0.05, 0.1, 0.3, 0.5, 0.7 and 1.0 mg/L) was applied on the mussel larvae to identify the survival rate with respect to various exposure times under laboratory condition. The ciliary movement of the larvae was used to check their survival. The 1.0 mg/L of chlorine shows to 97% of larvae mortality whereas 0.7 mg/L of chlorine shows only 16% of larvae mortality. Minimum exposure times for 100% larvae mortality ranged from 300 to 20 min for increasing concentrations of chlorine (0.05~1.0 mg/L). It was found that 1 mg/L of chlorine was 4 times more efficient than 0.7 mg/L of that, and 15 times more than 0.05 mg/L of chlorine dose. Data collected and analyzed here will help plant operators to optimize chlorine dosage and its scheduling.

• Fisheries and Aquatic Sciences
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• 제19권1호
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• pp.7.1-7.6
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• 2016

In nature, marine mussels (Mytilus edulis) suffer less fouling colonization on the newly formed sides of their shells. Using settlement assays with algal spores of Porphyra suborbiculata, we determined that spore attachment and germination on the periostracum decreased to 36.8 and 3.3 %, respectively. Additionally, the spore settlement was considerably diminished by periostracum dichloromethane extracts containing 19 % oleamide, a major antifouling compound. A scanning electron micrograph of the surface revealed a regular ripple structure with approximately $1.4{\mu}m$ between ripples. Based on these results, mussel periostraca or their associated biomimetic materials may become environmentally friendly, antifouling agents for preventing the settlement of soft foulants.

• Animal cells and systems
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• 제3권1호
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• pp.79-87
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• 1999

Mitochondrial DNA (mtDNA) from 54 specimens of the blue mussel (Mytilus edulis) species complex sampled from the southern coast of Korea was assayed for polymorphism with a portion of the COIII gene (336 bp). Fifteen haplotypes were found. PAUP, one-step networks, and PHYLIP analyses revealed the presence of two clearly differentiated mitochondrial clades (termed clades B and E), separated by 3.6% of minimum sequence divergence. The distribution pattern of the species appears to be consistent with category II of the phylogeographic pattern sensu (Avise et al., 1987): the presence of two discontinuous and distinct mtDNA genotypes in the same geographic region. This unusual mitochondrial polymorphism was explained by the presence of the Mediterranean species, M. galloprovincialis, possessing mtDNA of both M. galloprovincialis and M. edulis.

• Molecules and Cells
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• 제26권1호
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• pp.34-40
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• 2008

To express an increased level of recombinant Mefp1 (marine mussel adhesive protein) in soluble form, we constructed expression vectors encoding truncated OmpA signal peptide-Mefp1 fusion proteins. OmpA signal peptide (OmpASP) is the 21 residue peptide fragment of the 23 residue OmpA signal sequence cleavable by signal peptidase I. We successfully produced increased levels of soluble recombinant Mefp1 (rMefp1) with various deletions of OmpASP, and found that the increased expression was caused by the increased pI of the N-terminus of the fusion proteins (${\geq}10.55$). All the OmpA signal peptide segments of 3-21 amino acids in length had the same pI value (10.55). Our results suggest that the pI value of the truncated OmpASP ($OmpASP_{tr}$) play an important role in directional signaling for the fusion protein, but we found no evidence for the presence of a secretion enhancer in OmpASP. For practical applications, we increased the expression of soluble rMefp1 with $OmpASP_{tr}$ peptides as directional signals, and obtained rMefp1 with the native amino terminus (nN-rMefp1) using an $OmpASP_{tr}$ Xa leader sequence that contains the recognition site for Xa protease.