They are commonly known as Diatoms. The study of diatom is included as a part of phycology. Diatom plays an important in the ocean ecosystem because the production of 45 percent of organic materials is at the hand of diatoms. Economic importance. 2. The organic casing is a key component of the cell wall, preventing silica dissolution in seawater ( … 3. Economic Importance. Diatoms Images. As the typical features of ante-mortem drowning disappeared very rapidly with commencement of putrefaction and hence diatom test plays an important role for diagnosis and confirmation of drowning deaths. Sometimes diatom shells in seafloor sediment can over time become diatomaceous earth. These tiny organisms have been around for billions of years and play major roles in chemical and biological processes. Large spring blooms of the planktonic diatoms Aulacoseira subarctica Haworth and Stephanodiscus astraea occur every year and are terminated by SiO2 depletion. Algae - Algae - Ecological and commercial importance: Algae form organic food molecules from carbon dioxide and water through the process of photosynthesis, in which they capture energy from sunlight. Facts about Diatoms 9: studying diatoms. Diatoms are also useful in forensic studies. The diatom plastids are derived from red algal secondary symbiosis and are golden brown due to the high concentration of the carotenoid fucoxanthin. The diatom cell wall is composed of two silica-containing halves each consisting of a valve connected to a series of overlapping girdle bands and coated by an organic matrix (Round et al., 1990). Some ancient diatomaceous earth deposits that were once seafloor sediment are today dry land. The diatoms are the most beautiful microscopic algae due to their structure and sculpturing of their walls. If a person has drowned then diatoms are able to enter the human body. The species of diatom found in a deposit is dependant upon the age and paleo-environment of the deposit. This diatom retains it eukaryotic nucleus, and little is known about the degree of genetic interdependence between the endosymbiont and host. If a victim has breathed in water, diatoms can enter their blood stream, bone marrow, brain, lungs and kidneys. Journal History This article was published in the Botanical Gazette (1876-1991), which is continued by International Journal of Plant Sciences (1992-present). Although there are periods when one diatom species has dominated the other, over the period as a whole, the two diatoms appear to be in a stable coexistence. Diatomaceous earth mined from these deposits has a wide variety of important industrial uses as a filter and abrasive; some organic gardeners employ it for pest control. 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