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November 2003. Location. Lukang, Changhua County, Taiwan. Coordinates. 24°04′40″N 120°24′01″E. / 24.07778°N 120.40028°E / 24.07778; 120.40028. Type. museum. The BRAND'S Health Museum ( traditional Chinese: 白蘭氏健康博物館; simplified Chinese: 白兰氏健康博物馆; pinyin: Báilánshì Jiànkāng Bówùguǎn) is ...
Structure of a typical L-alpha-amino acid in the "neutral" form Amino acids are organic compounds that contain both amino and carboxylic acid functional groups.[1] Although over 500 amino acids exist in nature, by far the most important are the 22 α-amino acids incorporated into proteins.[2] Only these 22 appear in the genetic code of life.[3 ...
Vitamin B12, also known as cobalamin, is a water-soluble vitamin involved in metabolism.[2] It is one of eight B vitamins. It is required by animals, which use it as a cofactor in DNA synthesis, and in both fatty acid and amino acid metabolism.[3] It is important in the normal functioning of the nervous system via its role in the synthesis of ...
A representation of the 3D structure of the protein myoglobin showing turquoise α-helices. This protein was the first to have its structure solved by X-ray crystallography. Toward the right-center among the coils, a prosthetic group called a heme group (shown in gray) with a bound oxygen molecule (red). Proteins are large biomolecules and ...
- Composition
- Formation
- Discovery
- Other Deposits
- Commercial Form
- Usage
- Specific Varieties
- Microbial Degradation
- Climatologic Importance
- Safety Considerations
Each deposit of diatomaceous earth is different, with varying blends of pure diatomaceous earth combined with other natural clays and minerals. The diatoms in each deposit contain different amounts of silica, depending on the sedimentation conditions, on the presence of other sediments (clay, sand, volcanic ashes), and on the age of the deposit (di...
Diatomite forms by the accumulation of the amorphous silica (opal, SiO2·nH2O) remains of dead diatoms (microscopic single-celled algae) in lake sediment or marine sediments. The fossil remains consist of a pair of symmetrical shells or frustules. Marine diatomites are found in association with a wide variety of other rock types but lacustrine diato...
In 1836 or 1837, German peasant Peter Kasten discovered diatomaceous earth (German: Kieselgur) when sinking a well on the northern slopes of the Haußelberg hill, on Lüneburg Heath in North Germany. The extraction site on Lüneburg Heath was 1863–1994 Neuohe, while the storage sites were: The deposits are up to 28 meters (92 ft) thick and are all of ...
In Poland diatomaceous earth deposits are found in Jawornik, and are composed mostly of diatomaceous skeletons (frustules). In Germany, diatomaceous earth was also extracted at Altenschlirf on the Vogelsberg (Upper Hesse) and at Klieken (Saxony-Anhalt). There is a layer of diatomaceous earth more than 6 meters (20 ft) thick in the nature reserve of...
Diatomaceous earth is available commercially in several formats: 1. granulateddiatomaceous earth is a raw material simply crushed for convenient packaging 2. milled or micronizeddiatomaceous earth is especially fine (10 μm to 50 μm) and used for insecticides. 3. calcineddiatomaceous earth is heat-treated and activated for filters.
Explosives
In 1866, Alfred Nobel discovered that nitroglycerin could be made much more stable if absorbed in diatomite (kieselguhr). This allowed a much safer transport and handling than pure nitroglycerin under the liquid form. Nobel patented this mixture as dynamitein 1867; the mixture is also called guhr dynamite by reference to the German term kieselguhr.
Filtration
The Celle engineer, Wilhelm Berkefeld, recognized the ability of the diatomaceous earth to filter and developed tubular filters (known as filter candles) fired from diatomaceous earth. During the cholera epidemic in Hamburg in 1892, these Berkefeld filters were used successfully.One form of diatomaceous earth is used as a filter medium, especially for swimming pools. It has a high porosity because it is composed of microscopically small, hollow particles. Diatomaceous earth (sometimes referre...
Abrasive
The oldest use of diatomite is as a very mild abrasive and has been used in toothpaste, metal polishes, and some facial scrubs.
Tripolite is the variety found in Tripoli, Libya.Bann clay is the variety found in the Lower Bannvalley in Northern Ireland.Moler (mo-clay) is the variety found in northwestern Denmark, especially on the islands of Fur and Mors.Freshwater-derived food grade diatomaceous earth is the type used in United States agriculture for grain storage, as feed supplement, and as an insecticide. It is produced uncalcinated, has a very...Certain species of bacteria in oceans and lakes can accelerate the rate of dissolution of silica in dead and living diatoms by using hydrolyticenzymes to break down the organic algal material.
The Earth's climate is affected by dust in the atmosphere, so locating major sources of atmospheric dust is important for climatology. Recent research indicates that surface deposits of diatomaceous earth play an important role. Research shows that significant dust comes from the Bodélé Depression in Chad, where storms push diatomite gravel over du...
Inhalation of crystalline silica is harmful to the lungs, causing silicosis. Amorphous silica is considered to have low toxicity, but prolonged inhalation causes changes to the lungs. Diatomaceous earth is mostly amorphous silica but contains some crystalline silica, especially in the saltwater forms. In a 1978 study of workers, those exposed to na...
Polypropylene (PP), also known as polypropene, is a thermoplastic polymer used in a wide variety of applications. It is produced via chain-growth polymerization from the monomer propylene. Polypropylene belongs to the group of polyolefins and is partially crystalline and non-polar. Its properties are similar to polyethylene, but it is slightly ...
The Battle of Thermopylae (/θərˈmɒpɪliː/ thər-MOP-i-lee; Greek: Μάχη τῶν Θερμοπυλῶν, Máchē tōn Thermopylōn) was fought in 480 BC between the Achaemenid Persian Empire under Xerxes I and an alliance of Greek city-states led by Sparta under Leonidas I. Lasting over the course of three days, it was one of the most ...
