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Hanny Meirinawati
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Biochemistry, Genetics & Molecular Biology Environmental Science Other

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SILIKON TERLARUT UNTUK PERTUMBUHAN DIATOM Hanny Meirinawati
OSEANA Vol 43 No 1 (2018)
Publisher : Pusat Penelitian Oseanografi LIPI

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14203/oseana.2018.Vol.43No.1.10

Abstract

DISSOLVED SILICON FOR DIATOM GROWTH. Silicon is the second most abundant element in the earth’s crust. Silicon is an essential nutrient for diatom growth (Bacillariophyceae). Diatom require dissolved silicon to build silicate cell walls (frustule). Factors regulating diatom growth rate are cell size, concentration, heat, temperature, and concentration of Fe and Zn. The main source of dissolved silicon in the ocean is chemical weathering of rocks. The availability of dissolved silicon plays an important role in controlling the biogeochemical that regulates primary production, atmospheric CO, climate and ocean circulation. Changes in Si:N and Si:P ratios can affect the phytoplankton composition. Beside that, the function of silicon can reduce carbon dioxide levels from the atmosphere. This paper aims to provide information on the process of the occurrence of dissolved silicon in the sea and the function of dissolved silicon especially for diatom growth.
TRANSFORMASI NITROGEN DI LAUT Hanny Meirinawati
OSEANA Vol 42 No 1 (2017)
Publisher : Pusat Penelitian Oseanografi LIPI

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14203/oseana.2017.Vol.42No.1.37

Abstract

NITROGEN TRANSFORMATION IN MARINE ENVIRONMENT. Nitrogen transformations are undertaken by marine organisms as part of their metabolisms, either to obtain nitrogen to synthesize structural components or to gain energy for their growth. Nitrogen can stimulate primer productivity in an aquatic ecosystem. Increasing human activities can cause the increase of the number of nitrogen in the ocean. The increased input of nitrogen which is often accompanied by oxygen limitation has a strong negative effect on benthic metabolism and nitrogen mineralization. The ocean’s nitrogen cycle is driven by complex microbial transformations, including nitrogen fixation, assimilation, nitrification, anammox (anaerobic ammonium oxidation) and denitrification.
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