• Title/Summary/Keyword: Tapes philippinarum

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Analysis of butyltin compounds in Crassostrea gigas and Tapes philippinarum on the korean coast (한국연안의 참굴 및 바지락 속에 존재하는 부틸주석화합물의 분석)

  • Lee, Seongeon
    • Analytical Science and Technology
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    • v.22 no.5
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    • pp.360-368
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    • 2009
  • Tributyltin (TBT) use has been prohibited by the IMO (International Maritime Organization), as well as Korea, since 2003. This prohibition has affected a gradual reduction in TBT use in maritime environs (seawater, sediment, and biosamples) in several countries. In this study, Crassostrea gigas (oyster) and Tapes philippinarum (manila clam) were chosen and measured for butyltin compound concentrations to verify TBT pollution levels since its 2003 ban. Specimens were taken directly from farms for concentration measurement, where Crassostrea gigas and Tapes philippinarum are cultivated, as well as prevalent locations predicted to have been polluted. Concentrations of MBT, DBT, and TBT of Crassostrea gigas were measured to be N.D -N.D., N.D. -N.D., and N.D. -60.21 ng Sn $g^{-1}$ (wet wt), respectively. Regarding Tapes philippinarum, MBT, DBT, and TBT were N.D. -12.27 ng Sn $g^{-1}$ (wet wt), N.D. -45.95 ng Sn $g^{-1}$ (wet wt), and N.D.-7.30 ng Sn $g^{-1}$ (wet wt), respectively. For this research, a correlative study was conducted to determine butyltin compound concentration in Crassostrea gigas at the locations where measurements were made in 1994 to determine to what extent TBT pollution level decreased. A decrease in all 7 sites was observed. In 4 of the 7 samples, butyltin compounds were measured to be below the detection limit, while that of the Tapes philippinarum did not appear high compared to foreign research data.

Effect of the Compound Factors on the Survival of Tapes Philippinarum (복합요인이 바지락( Tapes Philippinarum)의 생존에 미치는 영향)

  • 최기철;권오길
    • The Korean Journal of Zoology
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    • v.9 no.2
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    • pp.1-6
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    • 1966
  • Effects of compound factors (temperature , salinity and turbidity 0 on Tapes philippinarum are as follows : 1. At 3 and 6 hours , critical temperature of 0.9-1.05 mm size is 38$^{\circ}C$ and 7.5-8.5mm, 23-25 mm exist between 35$^{\circ}C$ and 41$^{\circ}C$. 2. The main limiting factor of three combined factors is temperature. The effect on the survival of Tapes philippinarum is as follows : Temperature > salinity > turbidity. 3. In the worst condition, treatment time is also an important factor. Mortality is higher at 6 hour treatment than 3 hour. 4. We observed 39$^{\circ}C$ of water temperature at Tapes bed of Inchon in July 1965. Compared with experimental results, we are able to suppose that the mortality will be occurred at high degrees in the natural state. 5. As the size of the individual is increased , the survival rate is increased as well.

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Preliminary Studies on the Snails that Bore the Valves of Young Bivalve, Tapes philippinarum (Tapes philippinarum 의 치매에 천공하는 동물에 관하여(예보))

  • 최기철
    • The Korean Journal of Zoology
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    • v.5 no.2
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    • pp.9-12
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    • 1962
  • The present observations on the perforation bored into young bivalve Tapes philippinarum (less than 2 mm in shell length) by boring snails were conducted at Sunjae Island in 1960 and Inchon Harbor inn 1962. 1. Young bivalves of the species which were left with bored in them were found both in Inchon Harbor and Sunjae Island. 2. The location of the holes in the valves of the young bivalve varied widely, while the holes of the adult bivalve were located at relatively definite position in the valves. 3. The author realized that the holes are bored by a species of snails that have radulas, for the inner diameters of the holes were much smaller than the router diameters. 4. The size of the holes in the valves of young bivalve was much smaller than those holes bored in adult valves. The minimum size of the holes was only 7.5microns in diameter. 5. The author considered that the boring snail is Natica severa that is found abundantly in Inchon Harbor and Sunjae Island and that this snail is the only species found in the particular areas and performs the above mentioned behavior. However, the author could not confirm experimentally the snail drilling young bivalve of Tapes philippinarum .

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Studies on Lectins From Marine Shells (V) - Isolation and Purification of Letin from Tapes philippinarum. (해양 패류 렉틴성분 연구 (V) - 반지락조개의 렉틴성분 분리정제에 관한 연구)

  • 정시련;김장환;전경희
    • YAKHAK HOEJI
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    • v.31 no.2
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    • pp.52-59
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    • 1987
  • The result of the screening of lectins on 28 species of marine shell fishes(mollusks) showed that 10 species (Tapes philippinarum, Cyclosunetta menstrualis, Neptunea arthritica cumingii, Omphalius pfeifferi carpenteri, Chlorostoma argyrostoma turbinatum, Chiorostoma argyrostoma lischkei, Semisulcosira corea, Neptunea polycosta, Babylonica japonica, Noverita didyma) were present hemagglutinating properties to human A, B, and O group, and animal blood erythrocytes. A new lectin from Tapes philippinarum. was isolated and partially characterized. The lectin was purified by (NH$_4$)$_2$SO$_4$ precipitation and ion exchange chromatography on DE 53 column. Six fractions were obtained from DE 53 column by salt gradient elution but only 0.3M, and 0.4M NaCl fraction had strong lectin activity. On its 0.3M NaCl fraction, purity was identified by polyacrylamide gel electrophoresis. This lectin was inhibited by N-acetyl-D-galactosamine. It seems that two kinds of lectin react as antigen by immunochemical studies.

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Studies on Ciliary Activity of Bivalve, Tapes philippinarum , During Developmental Stages (성장단계에 따른 이매구, Tapes philippinarum 의 직모 연동능에 관한 연구)

  • 최기철;이춘구
    • The Korean Journal of Zoology
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    • v.4 no.2
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    • pp.1-6
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    • 1961
  • 바지락(Tapes philippinarum) 직모연동능에 미치는 몇가지 중요한 환경 요인의 영향에 관하여 생리학적 방법으로 조사하였다. 1. 산화환워전위 측정결과, 치매일수록 성매에 비하여 무기상태에 대한 저항성이 낮았다. 2. 치매의 직모연동능은 17$\pm$1$^{\circ}C$에서 산소장력 저하상태로 \ulcorner긴 20분후, 성매의 약 1/2 이하로 감소되었따. 3. 한편 수온 13$\pm$1$^{\circ}C$dpt는 직모운동능이 같은 산소장력의 저하에 의하여서도 성매 치매 모두가 비슷한 경향으로 급격히 억제되었다. 4. 수온 1$0^{\circ}C$에서 20 $^{\circ}C$로 옮겼을 때 성매와 치매의 직모연동능은 수온으로 인하여 거의 평행하게 최고치 약 2305까지 촉진되었다. 5. 특히 치매에 있어서는 부유토분자의 낮은 혼촉도에 의하여 직모연동능이 감소되었다. 6 바지락은 광감성물질임을 밝혔다. 7 . 이들 결과로서 치매의 높은 치사율은 해저서식지의 불리한 환경요인 특히 중량요인에 좌우되는 것임이 확실하다. 치사율을 좌우하는 가장 중요한 요인은 용존산소의 결지, 저온 그리고 심한 부유토의 온촉도이며 반하여 약간의 염도변동은 그리 치명적인 것이 아니다.

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Parvatrema timondavidi (Digenea; Gymnophallidae) transmitted by a clam, Tapes philippinarum, in Korea (반지락(Tapes philippinarurm)이 매개하는 Parvatrema timondavidi(Digenea; Gymnophallidae)의 피낭유충 및 성충의 형태)

  • Yu, Jae-Ran;Chae, Jong-Il;Lee, Sun-Hyeong
    • Parasites, Hosts and Diseases
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    • v.31 no.1
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    • pp.7-12
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    • 1993
  • Metaceriae of Parvatrema timondavidi (Digenea; Grmnophallidae) were found from Tapes phillippinarum, one of the most common marine clams in Korean. T. were philippinarum was collected from a fishery market in seoul, and all of the clams eximined were found to contain many gymnophyallid metacercariae. To get adult worms, 10 ICR mice were fed with 100 metacercariae each and sacrificed by cervical dislocation at 7, 10 and 14 mice were morphologically characterized by oval body shape, lage oral sucker with lateral located genital pore from the venttral sucker. Based on these characters they identified as P.timondawvidi Bartoli, 1964. this study first confirms the presence of P. timondawcidi metacercartae in T.philippinarum in Korea.

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Growth Comparison of Short Neck Clams, Tapes philippinarum between the Two Culturing Areas (양성장별 바지락, Tapes philippinarum의 성장)

  • 강경호;장종윤;김영훈
    • The Korean Journal of Malacology
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    • v.16 no.1_2
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    • pp.49-54
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    • 2000
  • The growth of short neck calms, Tapes philippinarum was compared between two areas, Songdo in Kamak Bay and Sudo in Chinhae Bay from April 1999 to March 2000. The short neck clams in Kamak bay grew from 13.84${\pm}$0.04 mm to 35.43${\pm}$1.22 mm in shell length, while those in Chinhae bay grew from 13.84${\pm}$0.04 mm to 31.91 ${\pm}$1.72 mm in 12 months. Shell height, shell breadth and total weight of the short neck clams in Kamak bay were also greater than those from Chinhae bay. Bottom quality of Chinhae bay showed negative skewness, and that of Kamak bay was positive skewness of Chinhae bay seems to be caused by the effect of strong tidal current. This may indicate that Kamak bay is better area than Chinhae bay for the culture of the short neck clams.

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AN ATTEMPT TO IMPROVETIDELANDA FORMARINE BIVALVES (2) The physical and chemical compositions of Tapes Philippinarum beds in Kyunggi Bay (해산패류 증식을 위한 간석지 개척에 관한 연구(2) 경기만내 Tapes Philippinarum 서식지 토양의 물리화학적 조성에 관하여)

  • LEE Choonkoo;CHANG Nam Kee
    • Korean Journal of Fisheries and Aquatic Sciences
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    • v.2 no.2
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    • pp.155-160
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    • 1969
  • The soil textures and chemical compositions of Tapes Philippinarum beds were investigated in order to estimate the grade of the habitat soil of T. Philippinarum for the improvement of natural tidal flats. The coefficients of correlation between tile percentages of debris, coarse sand, fine sand, silt, and clay of the habitat soil, and the population density of T. Philippinarum were 0.78, 0.73, -0.42, -0.68, and -0.51 respectively. And the optimum levels of same were above $13.5\%,\;above\;23.0\%\;below\;41.5\%,\;below\;10.0\%$, and below $6.8\%$ respectively The $SiO_2\;Al_2O_3+Fe_2O_3$ ratio of the soil of T. Philippinarum beds showed the range of 5.09 to 5.60. The levels of soil pH, water holding capacity, organic matter, total nitrogen, available phosphorus, exchangeable magnesium were 6.15-6.60, $4.26-6.86\%$, $0.40-1.10\%$ 14.0-27.0 ppm, $0.041-0.394\%,\;and\;0.009-0.132\%$ respectively.

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Processings and Quality Characteristics of Flavoring Substance from the Short-neck Clam, Tapes philippinarum (바지락을 이용한 풍미소재의 가공 및 품질특성)

  • MOON Jeong-Ho;KIM Jong-Tae;KANG Su-Tae;HUR Jong-Hwa;OH Kwang-Soo
    • Korean Journal of Fisheries and Aquatic Sciences
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    • v.36 no.3
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    • pp.210-219
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    • 2003
  • To develop natural flavoring substances, optimal two stage enzyme hydrolysis conditions and flavor compounds of short-neck clam (Tapes philippinarum) enzyme hydrolysates were examined. The optimal enzyme hydrolysis conditions for two stage enzyme hydrolysate (TSEH) of short-neck clam were revealed in temperature at $55^{\circ}C$ for 4 hours digestion with alcalase at the 1st stage and 4 hours digestion at $45^{\circ}C$ with exopeptidase type neutrase at the 2nd stage. In quality tests of hot-water extracts, steam extracts and 4 kinds of enzyme hydrolysates, TSEH processing method was superior to other methods in yield, nitrogen contents, organoleptic taste such as umami intensity and inhibition of off-flavor formation, and transparency of extract. Total free amino acid contents in hot-water extract, steam extract and TSEH were 1,352.1 mg/100 g, 1,174.1 mg/100 g and 2,122.4 mg/100 g, respectively, Major free amino acids in TSEH were glutamic acid, glycine, alanine, tyrosine, phenylalanine and arginine. As for nucleotides and other bases, betaine, TMAO and creatinine were principal components in TSEH. The major inorganic ions in TSEH were Na, K, P and Cl. TSEH also revealed very higher angiotensin-I converting enzyme inhibition effect $(70.7\%)$ than those of hot-water and steam extract. We conclude that TSEH from short-neck clam was more flavorable compared with the seasoning materials on the market, it could be utilized as the instant soup base and the seasoning substances for fisheries processing.