biogenic sediments - ορισμός. Τι είναι το biogenic sediments
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Τι (ποιος) είναι biogenic sediments - ορισμός

TYPE OF BIOGENIC MINERAL
Biogenic Silica; Biogenic opal
  • illumination]] on a [[light microscope]]. Diatomaceous earth is made up of [[diatom]] [[cell wall]]s, an example of  biogenic [[silica]]. Silica is synthesised in the diatom cell by the [[polymerisation]] of [[silicic acid]]. This image of diatomaceous earth particles in water is at a scale of 6.236 pixels/[[μm]], the entire image covers a region of approximately 1.13 by 0.69 mm.

Biogenic amine         
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BIOGENIC SUBSTANCE WITH ONE OR MORE AMINE GROUPS
Biogenic amines; Receptors, biogenic amine; Vasoactive amine; Endogenous amine
A biogenic amine is a biogenic substance with one or more amine groups. They are basic nitrogenous compounds formed mainly by decarboxylation of amino acids or by amination and transamination of aldehydes and ketones.
Cyclic sediments         
  • High Atlas middle liassic carbonate platform of Morocco and succession of regressive, autocyclic, "shallowing upward" metric sequences.
  • Model of a virtual "shallowing upward" metric sequence observed on carbonate platforms all along the south tethyan margin (about 10.000km) during the Liassic. (Micro)fossils are identical from the Maghreb till Oman and furtheron.
  • "shallowing upward" sequences from two sections distant of 230 km; note the hurricane (tempestites and tsunami ?)levels with abundant displaced foraminifera on supratidal flat. Middle Liassic, Morocco.
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SEQUENCES OF SEDIMENTARY ROCKS THAT ARE CHARACTERISED BY REPETITIVE PATTERNS OF DIFFERENT ROCK TYPES (STRATA) OR FACIES WITHIN THE SEQUENCE
Cyclic sedimentation; Cyclic sediment; Rhythmic sediment; Rhythmic sediments; Depositional cycle
Cyclic sediments (also called rhythmic sediments) are sequences of sedimentary rocks that are characterised by repetitive patterns of different rock types (strata) or facies within the sequence. Processes that generate sedimentary cyclicity can be either autocyclic or allocyclic, and can result in piles of sedimentary cycles hundreds or even thousands of metres thick.
biogenic         
  • Cyanobacteria extracts inhibiting the growth of ''Micrococcus luteus''
  • Model of movement of marine compounds
  • Chromatographic separation of chlorophyll
  • Biogenic sediment: limestone containing fossils
  • Natural gum, a secretion from ''[[Hevea brasiliensis]]''
  • Scanning electron microscope image of silver nanoparticles
  • access-date=2020-11-20 }}</ref>
  •  publisher = Springer-Verlag Press }}</ref>
  • Photobioreactor used to produce microalgae metabolites
SUBSTANCE PRODUCED BY LIFE PROCESSES; IT MAY BE EITHER CONSTITUENTS, OR SECRETIONS, OF PLANTS OR ANIMALS
Biogenetic; Biogenic; Abiogenic; Biogenic element
[?b???(?)'d??n?k]
¦ adjective produced or brought about by living organisms.

Βικιπαίδεια

Biogenic silica

Biogenic silica (bSi), also referred to as opal, biogenic opal, or amorphous opaline silica, forms one of the most widespread biogenic minerals. For example, microscopic particles of silica called phytoliths can be found in grasses and other plants.

Silica is an amorphous metal oxide formed by complex inorganic polymerization processes. This is opposed to the other major biogenic minerals, comprising carbonate and phosphate, which occur in nature as crystalline iono-covalent solids (e.g. salts) whose precipitation is dictated by solubility equilibria. Chemically, bSi is hydrated silica (SiO2·nH2O), which is essential to many plants and animals.

Diatoms in both fresh and salt water extract dissolved silica from the water to use as a component of their cell walls. Likewise, some holoplanktonic protozoa (Radiolaria), some sponges, and some plants (leaf phytoliths) use silicon as a structural material. Silicon is known to be required by chicks and rats for growth and skeletal development. Silicon is in human connective tissues, bones, teeth, skin, eyes, glands and organs.