Several others where nailing at least one treble-20 was an essential constituent of the winning sum.
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Currently no bromate-bearing minerals (i.e., the ones with bromate ion being an essential constituent) are known.
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Another characteristic that makes donnayite unique is the fact that it contains the REE, yttrium, as an essential constituent. Although donnayite has no known human uses, it has other characteristics that make it distinct and for this reason most people do not even know this mineral exists.
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Nitrogen is a major constituent of several of the most important plant substances. For example, nitrogen compounds comprise 40% to 50% of the dry matter of protoplasm, and it is a constituent of amino acids, the building blocks of proteins. It is also an essential constituent of chlorophyll. Nitrogen deficiency most often results in stunted growth, slow growth, and chlorosis.
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Resins are an essential constituent of powder coatings, a technology used to apply a decorative or protective finish in the automotive, furniture and appliance markets. Recent technology advancements now allow the use of powder coatings on heat-sensitive materials such as wood and plastics.Deruyttere, Xavier. “A new versatile waterborne energy-curable resin drives industrial wood & furniture coatings out of the beaten tracks”.
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Melilite also occurs in unusual silica-undersaturated igneous rocks. Some of these rocks appear to have formed by reaction of magmas with limestone. Other igneous rocks containing melilite crystallize from magma derived from the Earth's mantle and apparently uncontaminated by the Earth's crust. The presence of melilite is an essential constituent in some rare igneous rocks, such as olivine melilitite.
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Isolated crystals are rare, but orthopyroxene is an essential constituent of various types of igneous rocks and metamorphic rocks. Magnesian orthopyroxene occurs in plutonic rocks such as gabbro (norite) and diorite. It may form small idiomorphic phenocrysts and also groundmass grains in volcanic rocks such as basalt, andesite, and dacite. Enstatite, close to En90Fs10 in composition, is an essential mineral in typical peridotite and pyroxenite of the Earth's mantle.
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In many parts of the world metamorphic rocks of gneissose character occur containing scapolite as an essential constituent. Their origin is often obscure, but it is probable that they are of two kinds. One series is essentially igneous (orthogneisses); usually they contain pale green pyroxene, a variable amount of feldspar, sphene, and iron oxides. Quartz, rutile, green hornblende and biotite are often present, while garnet occurs sometimes; hypersthene is rare.
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The discovery of theralite was looked forward to with interest as completing the series of basic rocks containing nepheline as an essential constituent. With the increase in silica (SiO2) and the concomitant reduction in nepheline, theralite becomes gabbro. With a decrease in silica and reduction in olivine theralite grades into teschenite and with the addition of sodic feldspar, grades into essexite. With a further reduction in silica such that there is no feldspar these rocks become melteigites.
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"Risk", Goldmann wrote in his classic study of Pascal's Pensées and Jean Racine's Phèdre, "is possibility of failure, hope of success, and the synthesis of the three in a faith which is a wager are the essential constituent elements of the human condition". He called his work "dialectical" and "humanist". He sought to synthesize the genetic epistemology of Piaget with the Marxism of György Lukács."Genetic structuralism and the analysis of social consciousness"; accessed 3 July 2020.
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It forms a solid solution series with the minerals enstatite and ferrosilite, being a mid-way member between the two. Pure enstatite contains no iron, while pure ferrosillite contains no magnesium; hypersthene is the name given to the mineral when a significant amount of both elements are present. Distinctly developed crystals are rare, the mineral being usually found as foliated masses embedded in the igneous rocks norite and hypersthene-andesite, of which it forms an essential constituent. The coarse-grained labradorite-hypersthene-rock (norite) of Paul's Island off the coast of Labrador has furnished the most typical material; for this reason, the mineral has been known as Labrador hornblende or paulite.
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It forms an essential constituent of certain alkaline plutonic rocks of the nepheline syenite series, which are typically developed in southern Norway. The color and greasy luster of elaeolite (a name given by M. H. Klaproth 1809, from Greek words for oil [ἔλαίον] and stone [λίθος]; ) are due to the presence of numerous microscopic enclosures of other minerals, possibly augite or hornblende. These enclosures sometimes give rise to a chatoyant effect like that of cats-eye and cymophane; and elaeolite when of a good green or red color and showing a distinct band of light is sometimes cut as a gem-stone with a convex surface.
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Antoine-Laurent Lavoisier by Jules Dalou 1866 Lavoisier's fundamental contributions to chemistry were a result of a conscious effort to fit all experiments into the framework of a single theory. He established the consistent use of the chemical balance, used oxygen to overthrow the phlogiston theory, and developed a new system of chemical nomenclature which held that oxygen was an essential constituent of all acids (which later turned out to be erroneous). Lavoisier also did early research in physical chemistry and thermodynamics in joint experiments with Laplace. They used a calorimeter to estimate the heat evolved per unit of carbon dioxide produced, eventually finding the same ratio for a flame and animals, indicating that animals produced energy by a type of combustion reaction.
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The SLP has fewer elastic and collagenous fibers than the two other layers, and thus is looser and more pliable. The ILP is mostly composed of elastic fibers, while the DLP has fewer elastic fibers, and more collagenous fibers. In those two layers, which form what is known as the vocalis ligament, the elastic and collagenous fibers are densely packed as bundles that run almost parallel to the edge of the vocal fold. There is a steady increase in the elastin content of the lamina propria as humans age (elastin is a yellow scleroprotein, the essential constituent of the elastic connective tissue) resulting in a decrease in the ability of the lamina propria to expand caused by cross-branching of the elastin fibers.
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Heme synthesis—note that some reactions occur in the cytoplasm and some in the mitochondrion (yellow) In humans, porphyrins are the main precursors of heme, an essential constituent of hemoglobin, myoglobin, catalase, peroxidase, and P450 liver cytochromes. The body requires porphyrins to produce heme, which is used to carry oxygen in the blood among other things, but in the porphyrias there is a deficiency (inherited or acquired) of the enzymes that transform the various porphyrins into others, leading to abnormally high levels of one or more of these substances. Porphyrias are classified in two ways, by symptoms and by pathophysiology. Physiologically, porphyrias are classified as liver or erythropoietic based on the sites of accumulation of heme precursors, either in the liver or in the bone marrow and red blood cells.
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Art and Medicine Die Photographie als Hülfsmittel mikroskopischer Forschung Along with Camillo Golgi, he was a major proponent of the reticular theory that the brain's nervous system consisted of processes of contiguous cells fused to create a massive meshed network. Gerlach summed up his theory by stating: > the finest divisions of the protoplasmic processes ultimately take part in > the formation of the fine nerve fibre network which I consider to be an > essential constituent of the gray matter of the spinal cord. The divisions > are none other than the beginnings of this nerve fibre net. The cells of the > gray matter are therefore doubly connected by means the nerve process which > becomes the axis fibre and through the finest branches of the protoplasmic > processes which become a part of the fine nerve fibre net of the gray > matter.
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