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Coral Reefs in Indonesia: A Review on Anthropogenic and Natural Disturbances
Meinita, Maria Dyah Nur The Korean Society for Marine Biotechnology 2007 한국해양바이오학회지 Vol.2 No.1
Coral reefs are among the most dynamic and various ecosystems on tropical ecosystem. They provide a large number of important ecosystem services. Despite their importance, they appear to be one of the most susceptible marine ecosystems. Dramatic decreasing of coral reefs has been reported from every part of the world. Indonesia contains 18% of coral reefs of world's total. Unfortunately the status of coral reefs in Indonesia is already in critical and poor condition. Coral reefs communities in Indonesia are subjected to a variety of environmental disturbance. Threats to Indonesia's coral reefs resources can be divided into two main types: anthropogenic and natural disturbances. The major anthropogenic disturbances on coral reefs in Indonesia are destructive fishing, pollution, coastal development, mining and harvesting live fish and coral, tourism. The natural disturbances such as cyclones, volcanic eruptions, earthquakes, tsunami and predator also contribute to coral reefs destruction in Indonesia. In my paper I tried to compare between natural and anthropogenic disturbances on coral reefs in Indonesia and raised these questions: (i) how the natural disturbances differ from anthropogenic area (ii) which type of disturbances has caused the greatest impact on coral reef ecosystem. My finding is that both of anthropogenic and natural disturbances give major impact on coral reefs in Indonesia. The important issue here is coral reef resilience could be disturbed by synergistic effects between various anthropogenic and natural disturbances. This phenomenon has significant conservation and management implication. The appropriate management should be conducted to protect coral reefs ecosystem in Indonesia. Mangrove management will succeed only when local people are involved and get sustainable benefits from mangrove ecosystem. Community based management and Integrated Coastal Zone Management (ICZM) are type of management that can be applied on coral reef ecosystems in Indonesia.
Isolation of the Agarolytic Bacterium Vibrio cyclotrophicus DAG-130 from Abalone Gut
Meinita, Maria Dyah Nur,Luyen, Hai-Quoc,Hwang, Seon-Yeong,Kang, Ji-Young,Jin, Deuk-Hee,Hong, Yong-Ki The Korean Society of Fisheries and Aquatic Scienc 2008 Fisheries and Aquatic Sciences Vol.11 No.2
We isolated 1,916 strains of bacteria from gut and feces of abalone. The most active agarolytic bacterium, DAG-130, was identified from the gut of the abalone Haliotis gigantea. Of the bacteria harbored by both H. discus hannai and H. gigantea, 59% were agarolytic. There was no significant difference in the number of agarolytic bacteria isolated from abalone fed on the seaweeds Gelidium amansii, Laminaria japonica, or Undaria pinnatifida. Of the agarolytic bacteria, 72% were isolated from the guts of all sources tested while 43% came from the feces. The strain DAG-130 showed 100% identity with the bacterium Vibrio cyclotrophicus based on phylogenetic analysis of l6S rDNA. The bacterium produced monomers and oligomers from the agar substrate.
Isolation of the Agarolytic Bacterium Vibrio cyclotrophicus DAG-130 from Abalone Gut
Maria D.N.Meinita,Hai-Quoc Luyen,황선영,강지영,진덕희,홍용기 한국수산과학회 2008 Fisheries and Aquatic Sciences Vol.11 No.2
We isolated 1,916 strains of bacteria from gut and feces of abalone. The most active agarolytic bacterium, DAG-130, was identified from the gut of the abalone Haliotis gigantea. Of the bacteria harbored by both H. discus hannai and H. gigantea, 59% were agarolytic. There was no significant difference in the number of agarolytic bacteria isolated from abalone fed on the seaweeds Gelidium amansii, Laminaria japonica, or Undaria pinnatifida. Of the agarolytic bacteria, 72% were isolated from the guts of all sources tested while 43% came from the feces. The strain DAG-130 showed 100% identity with the bacterium Vibrio cyclotrophicus based on phylogenetic analysis of 16S rDNA. The bacterium produced monomers and oligomers from the agar substrate.
Maria Dyah Nur Meinita,Bintang Marhaeni,Tjahjo Winanto,Dwi Setyaningsih,홍용기 한국공업화학회 2015 Journal of Industrial and Engineering Chemistry Vol.27 No.-
Gelidium latifolium was selected as a potential resource for bioethanol production among 25 tropical redseaweed species candidates due to its high carbohydrate content. This report shows a catalytic efficiencycomparison between sulfuric (H2SO4) and hydrochloric acid (HCl) as feasible catalysts, which are usedfor the hydrolysis of G. latifolium. H2SO4 showed better hydrolysis compared to HCl based on sugarproduction, catalytic efficiency, and ethanol production. These results are important for futureapplications of bioethanol production on an industrial scale.
Macroalgae as the Source for Environmental Assessment
Luyen, Hai-Quoc,Meinita, Maria D.N.,Hong, Yong-Ki The Korean Society for Marine Biotechnology 2007 한국해양바이오학회지 Vol.2 No.2
Macroalgal tissues can be used as indicating materials for environmental assessment using several algal biotechnology techniques. As bioassay test organisms, macroalgal tissues are required as an axenic state for suitable biological indicators. Callus formation and blade regeneration under suitable culture conditions are also useful for the tests. Quantitative method using tetrazolium chloride or $alamarBlue^{TM}$ is devised on a rapid assessment of the seaweed viability. The use of RT-PCR especially differential display technique should provide the means for the detection and isolation of the responding genes induced by the environmental stress. Seaweed thriving in more environmental changes might contain more diverse biologically active substances.