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92575C

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Image #   92575C
Name:   Fresh water pennate diatom colony (Asterionella sp.)
Copyright:   Copyright 2009 Dennis Kunkel Microscopy, Inc.
Description:   Caption: Fresh water pennate diatom colony (Asterionella sp.). Asterionella is a genera of planktonic fresh water diatoms found worldwide.The cells are joined at the broadest apex by mucilage pads to form stellate or spiral colonies. Some populations are particularly susceptible to chytrid infestations. This genus is a biological indicator of hard water. The body or frustule of each pennate cell in the colony is composed of two halves which fit tightly together. The cell walls contain silica dioxide (glass) which are preserved in deposits known as diatomaceous earth. Once hardened into rock it is called diatomite and can be used for many purposes including filters, fillers and abrasives. There are many phytoplankton diatom genera that are an important part of the food chain. Diatoms represent about 25% of the plant biomass in the world. Found both in fresh water and salt water these microscopic unicellular plants are important biomass and oxygen producers. Through their photosynthesis, greenhouse gasses are converted to organic material and they therefore play a decisive role in the global carbon dioxide circulation. When individual cells die they remain as siliceous (silica dioxide) cell walls and sink to the bottom of the lake or ocean. Research has shown that the walls of fossil diatoms can give valuable information about past environment and climate conditions and serve as indicators for historical dating of sediments. Industries use the diatom silica walls in the form of diatomaceous earth for polishing material and for filtering wine and beer. In the field of nanotechnology the motility of such tiny cells and the silica cell wall design has been used as a pattern for car wheels. Omega-3 fatty acids of the diatoms have been found to benefit the nervous system.
Magnification*: x135
Type: SEM
    *(Magnifications are based on a 35mm slide image of 24mm in the narrow dimension.)
Keywords:   Algae diatom pennate alga silica skeleton fresh water aquatic frustule plankton phytoplankton eukaryote Asterionella SEM 92575C Asterionella colony colonial diatom diatom colony freshwater diatom freshwater diatom colony freshwater diatoms algae Navicula aquatic biomass plant biomass photosynthesis silica frustule silica cell wall frustules oxygen producer biomass global carbon dioxide circulation carbon dioxide circulation greenhouse gas greenhouse gasses Heterokontophyta photosynthetic alga photosynthetic algae silicious cell wall glass cell wall silica dioxide fossil diatom fossil diatoms climate change climate changes biological indicator biological indicators biology indicator biology indicators nanotechnology diatomaceous earth polishing filtering omega-3 fatty acid omega-3 fatty acids diatom locomotion diatom movement environmental indicator carbon dioxide build up greenhouse effect pennate fresh water diatom pennate fresh water diatoms fresh water diatoms organic biomass organic material bacillariophyceae bacillarophyta pennate diatom Fragilariaceae Pennales hard water colonial diatoms diatom colonies diatom spiral colonies diatom spiral colony fresh water pennate diatom fresh water pennate diatoms freshwater freshwater pennate diatom freshwater pennate diatoms diatom phytoplankton planktonic planktonic diatom fresh water phytoplankton fresh water plankton freshwater phytoplankton freshwater plankton planktonic diatoms 03.01.09

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