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CyTOF mass cytometry data is recorded in tables that list, for each cell, the signal detected per channel, which is proportional to the number of antibodies tagged with the corresponding channel's isotope bound to that cell. These data are formatted as FCS files, which are compatible with traditional flow cytometry sof... | 3 | Analytical Chemistry |
Slayton Alvin Evans Jr. was born on May 17, 1943, in Chicago, Illinois, to Corine M. Thompson Evans and Slayton A. Evans, Sr. Months later, his father was called to serve in World War II. When Slayton was three years old, the family moved to Meridian, Mississippi, where they lived in a segregated public housing project... | 4 | Stereochemistry |
Cyrus Eaton (1883–1979) in 1925 purchased the small Trumbull Steel Company of Warren, Ohio, for $18 million. In the late 1920s he purchased undervalued steel and rubber companies. In 1930, Eaton consolidated his steel holdings into the Republic Steel, based in Cleveland; it became the third-largest steel producer in th... | 8 | Metallurgy |
Glomalin is a hypothetical glycoprotein produced abundantly on hyphae and spores of arbuscular mycorrhizal (AM) fungi in soil and in roots. Glomalin was proposed in 1996 by Sara F. Wright, a scientist at the USDA Agricultural Research Service, but it was not isolated and described yet. The name comes from Glomerales,... | 9 | Geochemistry |
Pseudoephedrine is contraindicated in patients with diabetes mellitus, cardiovascular disease, severe or uncontrolled hypertension, severe coronary artery disease, prostatic hypertrophy, hyperthyroidism, closed angle glaucoma, or by pregnant women. The safety and effectiveness of nasal decongestant use in children is u... | 4 | Stereochemistry |
The Davies equation is an empirical extension of Debye–Hückel theory which can be used to calculate activity coefficients of electrolyte solutions at relatively high concentrations at 25 °C. The equation, originally published in 1938, was refined by fitting to experimental data. The final form of the equation gives the... | 7 | Physical Chemistry |
Surfactants reduce oil-water interfacial tension, which helps waves break oil into small droplets. A mixture of oil and water is normally unstable, but can be stabilized with the addition of surfactants; these surfactants can prevent coalescence of dispersed oil droplets. The effectiveness of the dispersant depends on ... | 2 | Environmental Chemistry |
In spark plasma sintering (SPS), external pressure and an electric field are applied simultaneously to enhance the densification of the metallic/ceramic powder compacts. However, after commercialization it was determined there is no plasma, so the proper name is spark sintering as coined by Lenel. The electric field dr... | 8 | Metallurgy |
Early results from Dan Nocera, a researcher at Harvard University, gave insight on how his newly created bionic leaf can be used for fertilizer production. This new bionic leaf uses photovoltaic cells in conjunction with Xanthobacter autotrophicus bacteria to create a plastic called polyhydroxybutyrate (PHB). PHB suppl... | 5 | Photochemistry |
Quasi-crystals are supramolecular aggregates exhibiting both crystalline (solid) properties as well as amorphous, liquid-like properties.
Self-organized structures termed "quasi-crystals" were originally described in 1978 by the Israeli scientist Valeri A. Krongauz of the Weizmann Institute of Science, in the Nature pa... | 6 | Supramolecular Chemistry |
A glycosyl donor is a carbohydrate mono- or oligosaccharide that will react with a suitable glycosyl acceptor to form a new glycosidic bond. By convention, the donor is the member of this pair that contains the resulting anomeric carbon of the new glycosidic bond. The resulting reaction is referred to as a glycosylatio... | 0 | Organic Chemistry |
The simplest test to evaluate whether a coal is suitable for production of coke is the free swelling index test. This involves heating a small sample of coal in a standardised crucible to around 800 degrees Celsius (1500 °F).<br>
After heating for a specified time, or until all volatiles are driven off, a small coke bu... | 3 | Analytical Chemistry |
Ouabain is no longer approved for use in the USA. In France and Germany, however, intravenous ouabain has a long history in the treatment of heart failure, and some continue to advocate its use intravenously and orally in angina pectoris and myocardial infarction despite its poor and variable absorption. The positive p... | 0 | Organic Chemistry |
The measurement of the angles can be used to determine crystal structure, see x-ray crystallography for more details. As a simple example, Bragg's law, as stated above, can be used to obtain the lattice spacing of a particular cubic system through the following relation:
where is the lattice spacing of the cubic cryst... | 3 | Analytical Chemistry |
Transactivation can be triggered either by endogenous cellular or viral proteins, also called transactivators. These protein factors act in trans (i.e., intermolecularly). HIV and HTLV are just two of the many viruses that encode transactivators to enhance viral gene expression. These transactivators can also be linke... | 1 | Biochemistry |
TFA is the precursor to many other fluorinated compounds such as trifluoroacetic anhydride, trifluoroperacetic acid, and 2,2,2-trifluoroethanol. It is a reagent used in organic synthesis because of a combination of convenient properties: volatility, solubility in organic solvents, and its strength as an acid. TFA is al... | 0 | Organic Chemistry |
In biochemistry, mixed acid fermentation is the metabolic process by which a six-carbon sugar (e.g. glucose, ) is converted into a complex and variable mixture of acids. It is an anaerobic (non-oxygen-requiring) fermentation reaction that is common in bacteria. It is characteristic for members of the Enterobacteriaceae... | 1 | Biochemistry |
Some polymer solutions have an LCST at temperatures higher than the UCST. As shown in the diagram, this means that there is a temperature interval of complete miscibility, with partial miscibility at both higher and lower temperatures.
In the case of polymer solutions, the LCST also depends on polymer degree of polymer... | 7 | Physical Chemistry |
A correlation with drug-lipid-complexes were correlated with high-throughput surface tension device to predict phospholipidosis in particular cationic drugs. | 7 | Physical Chemistry |
A further dynamic method to assemble such structures was introduced by Lee et al. Here, polymeric beads are placed together with a fluid of higher density inside a rotating lathe.
When the lathe is static, the beads float on top of the liquid. With increasing rotational speed, the centripetal force then pushes the flui... | 3 | Analytical Chemistry |
In general, many questions exist about the health and environmental effects of many herbicides because of the large number of herbicides and the myriad potential targets, mostly unintended. For example, a 1995 panel of 13 scientists reviewing studies on the carcinogenicity of 2,4-D had divided opinions on the likelihoo... | 2 | Environmental Chemistry |
Optodes can apply various optical measurement schemes such as reflection, absorption, evanescent wave, luminescence (fluorescence and phosphorescences), chemiluminescence, surface plasmon resonance. By far the most popular methodology is luminescence.
Luminescence in solution obeys the linear Stern–Volmer relationship.... | 7 | Physical Chemistry |
There have been several enantioselective versions of this reaction developed, and even employed in synthesis of complex molecules. Hoyvedas synthesis of (R')-(-)-sporochnol included an asymmetric copper-catalyzed allylic substitution with an organozinc nucleophile and peptide ligand.
A TaniaPHOS ligand, a ferrocenylpho... | 0 | Organic Chemistry |
The eastern blotting technique is used to detect post-translational modification of proteins. Proteins blotted on to the PVDF or nitrocellulose membrane are probed for modifications using specific substrates. | 1 | Biochemistry |
Sulfide (British English also sulphide) is an inorganic anion of sulfur with the chemical formula S or a compound containing one or more S ions. Solutions of sulfide salts are corrosive. Sulfide also refers to large families of inorganic and organic compounds, e.g. lead sulfide and dimethyl sulfide. Hydrogen sulfide (... | 0 | Organic Chemistry |
SK channels (small conductance calcium-activated potassium channels) are a subfamily of calcium-activated potassium channels. They are so called because of their small single channel conductance in the order of 10 pS. SK channels are a type of ion channel allowing potassium cations to cross the cell membrane and are ac... | 1 | Biochemistry |
Titanium tetrachloride is the inorganic compound with the formula . It is an important intermediate in the production of titanium metal and the pigment titanium dioxide. is a volatile liquid. Upon contact with humid air, it forms thick clouds of titanium dioxide () and hydrochloric acid, a reaction that was formerly e... | 0 | Organic Chemistry |
Adsorption of molecules onto polymer surfaces is central to a number of applications, including development of non-stick coatings and in various biomedical devices. Polymers may also be adsorbed to surfaces through polyelectrolyte adsorption. | 7 | Physical Chemistry |
There are three modes of formation of twinned crystals.
* Growth twins are the result of an interruption or change in the lattice during formation or growth due to a possible deformation from a larger substituting ion. Parallel growth describes a form of crystal growth that produces the appearance of a cluster of alig... | 3 | Analytical Chemistry |
Mitochondrial disease is a group of disorders caused by mitochondrial dysfunction. Mitochondria are the organelles that generate energy for the cell and are found in every cell of the human body except red blood cells. They convert the energy of food molecules into the ATP that powers most cell functions.
Mitochondrial... | 1 | Biochemistry |
SVA elements are present at lower levels than SINES and LINEs in humans. The starts of SVA and Alu elements are similar, followed by repeats and an end similar to endogenous retrovirus. LINEs bind to sites flanking SVA elements to transpose them. SVA are one of the youngest transposons in great apes genome and among th... | 1 | Biochemistry |
Dark pigments in the substantia nigra were first described in 1838 by Purkyně, and the term neuromelanin was proposed in 1957 by Lillie, though it has been thought to serve no function until recently. It is now believed to play a vital role in preventing cell death in certain parts of the brain. It has been linked to P... | 1 | Biochemistry |
Children with acute otitis media who are younger than six months of age are generally treated with amoxicillin or other antibiotics. Although most children with acute otitis media who are older than two years old do not benefit from treatment with amoxicillin or other antibiotics, such treatment may be helpful in child... | 4 | Stereochemistry |
For Regime I, the growth rate on the front laterally, referred to as g, is the rate-determining step (RDS) and exceeds the secondary nucleation rate, i. In this instance of g >> i, monolayers are formed one at a time so that if the substrate has a length of L and thickness, b, the overall linear growth can be described... | 7 | Physical Chemistry |
It has been shown by Fulda et al. that the naturally occurring compound resveratrol (a polyphenol found in grapes and red wine) can be used as a sensitizer for anticancer drug-induced apoptosis by the action of causing cell cycle arrest. This cell cycle arrest causes a dramatic decline in survivin levels in the cells, ... | 1 | Biochemistry |
Among the TrkA agonists, the small molecule gambogic amide exerts a potent neurotrophic activity decreasing apoptosis in primary hippocampal neurons. The non-peptidic TrkA agonist MT2 protects neurons from Aβ amyloid-mediated death in NGF-deficient neurons and talaumidin and its derivatives show neuroprotective effects... | 1 | Biochemistry |
The breakdown of phytoplankton in the environment depends on the presence of oxygen, and once oxygen is no longer in the bodies of water, ligninperoxidases cannot continue to break down the lignin. When oxygen is not present in the water, the time required for breakdown of phytoplankton changes from 10.7 days to a tota... | 9 | Geochemistry |
Gene targeting (GT), or homology-directed repair (HDR), is used routinely in plant genome engineering to insert specific sequences, with the first published example of GT in plants in the 1980s. However, gene targeting is particularly challenging in higher plants due to the low rates of Homologous Recombination, or Ho... | 1 | Biochemistry |
Paste tailings is a modification to the conventional methods of disposal of tailings (pond storage). Conventional tailings slurries are composed of a low percent of solids and relatively high water content (normally ranging from 20% to 60% solids for most hard rock mining) and when deposited into the tailings pond the ... | 8 | Metallurgy |
Empowering Women in Organic Chemistry (EWOC) is a scientific conference designed to bring the research and career interests of women in organic chemistry to the forefront and seeks to empower all marginalized individuals by promoting equity, justice, diversity, and inclusion across all chemistry fields. EWOC is the wor... | 0 | Organic Chemistry |
The magnitude and composition of the starvation response (i.e. metabolic adaptation) was estimated in a study of 8 individuals living in isolation in Biosphere 2 for two years. During their isolation, they gradually lost an average of 15% (range: 9–24%) of their body weight due to harsh conditions. On emerging from iso... | 1 | Biochemistry |
Cell–cell fusogens are proteins that promote plasma membrane fusion among different cells. To be considered a fusogen, it must be required for fusion, fuse unfamiliar membranes, and be present on the fusing membrane when need be. These cells include but are not limited too: gametes, trophoblasts, epithelial, and other ... | 1 | Biochemistry |
Lead(II) fluoride can be prepared by treating lead(II) hydroxide or lead(II) carbonate with hydrofluoric acid:
: Pb(OH) + 2 HF → PbF + 2 HO
Alternatively, it is precipitated by adding hydrofluoric acid to a lead(II) salt solution, or by adding a fluoride salt to a lead salt, such as potassium fluoride to a lead(II) nit... | 0 | Organic Chemistry |
The first definitive description of a chloroplast (Chlorophyllkörnen, "grain of chlorophyll") was given by Hugo von Mohl in 1837 as discrete bodies within the green plant cell. In 1883, Andreas Franz Wilhelm Schimper named these bodies as "chloroplastids" (Chloroplastiden). In 1884, Eduard Strasburger adopted the term ... | 5 | Photochemistry |
Epinephrine and glucagon affect the activity of protein kinase A by changing the levels of cAMP in a cell via the G-protein mechanism, using adenylate cyclase. Protein kinase A acts to phosphorylate many enzymes important in metabolism. For example, protein kinase A phosphorylates acetyl-CoA carboxylase and pyruvate de... | 1 | Biochemistry |
Lawrence Stamper Darken has shown that the Gibbs-Duhem equation can be applied to the determination of chemical potentials of components from a multicomponent system from experimental data regarding the chemical potential of only one component (here component 2) at all compositions. He has deduced the following relati... | 7 | Physical Chemistry |
Fine chemicals are used as starting materials for specialty chemicals. The latter are obtained either by direct formulation or after chemical/biochemical transformation of intermediates to active substances. Life sciences, primarily pharmaceutical, agrochemical and food and feed industries are the main consumers of fin... | 0 | Organic Chemistry |
* Cross-coupling reactions
** Castro-Stephens coupling
** Heck reaction
** Stille reaction
** Suzuki reaction
** Negishi coupling
** Kumada coupling
* Transmetalation | 0 | Organic Chemistry |
FMR arises from the precessional motion of the (usually quite large) magnetization of a ferromagnetic material in an external magnetic field . The magnetic field exerts a torque on the sample magnetization which causes the magnetic moments in the sample to precess. The precession frequency of the magnetization depen... | 7 | Physical Chemistry |
*1.[https://web.archive.org/web/20060118094514/http://mitpress.mit.edu/catalog/item/default.asp?ttype=2&tid=5039 Nanotechnology: Molecular Speculations on Global Abundance]
*2.[https://www.amazon.com/gp/product/354067215X Functional MRI] | 1 | Biochemistry |
The first refinements of copper alloys by a converter took place in Ducktown, Tennessee where A. Raht worked on a partial refinement of the matte from 1866 to 1875. In 1867, the Russians Jossa and Latelin tried to experimentally verify the studies of Semenikow. In 1870, they stopped their experiments after only having... | 8 | Metallurgy |
Some amino acids are more likely to be replaced. One of the factors that influences this tendency is physicochemical distance. Example of a measure of amino acid can be Graurs Stability Index. The assumption of this measure is that the amino acid replacement rate and proteins evolution is dependent on the amino acid c... | 1 | Biochemistry |
Modified Lak wettability index exists which is based on the areas below water and oil relative permeability curves.
where
: : modified Lak wettability index (index values near -1 and 1 represent strongly oil-wet and strongly water-wet rocks, respectively)
: : Area under the oil relative permeability curve
: : Area un... | 7 | Physical Chemistry |
SABIO-RK (System for the Analysis of Biochemical Pathways - Reaction Kinetics) is a web-accessible database storing information about biochemical reactions and their kinetic properties.
SABIO-RK comprises a reaction-oriented representation of quantitative information on reaction dynamics based on a given selected publi... | 1 | Biochemistry |
Trandolapril is teratogenic (US: pregnancy category D) and can cause birth defects and even death of the developing fetus. The highest risk to the fetus is during the second and third trimesters. When pregnancy is detected, trandolapril should be discontinued as soon as possible. Trandolapril should not be administere... | 4 | Stereochemistry |
A ribonucleotide tri-phosphate (rNTP) is composed of a ribose sugar, 3 phosphate groups attached via diester bonds to the 5 oxygen on the ribose and a nitrogenous base attached to the 1 carbon on the ribose. rNTP's are also referred to as NTPs while the deoxyribose version is referred to as dNTPs. The nitrogenous base ... | 1 | Biochemistry |
The following table lists some reported reactions that are relevant to photogeochemical study, including reactions that involve only naturally occurring compounds as well as complementary reactions that involve synthetic but related compounds. The selection of reactions and references given is merely illustrative and ... | 5 | Photochemistry |
SNPs can be easily assayed due to only containing two possible alleles and three possible genotypes involving the two alleles: homozygous A, homozygous B and heterozygous AB, leading to many possible techniques for analysis. Some include: DNA sequencing; capillary electrophoresis; mass spectrometry; single-strand confo... | 1 | Biochemistry |
Crystal luciferin was found to be fluorescent, absorbing ultraviolet light with a peak at 327 nm and emitting light with a peak at 530 nm. Visible emission occurs upon relaxation of the oxyluciferin from a singlet excited state down to its ground state. Alkaline solutions caused a redshift of the absorption likely due ... | 1 | Biochemistry |
Ethyl cyanohydroxyiminoacetate is obtained in the reaction of ethyl cyanoacetate and nitrous acid (from sodium nitrite and acetic acid) in 87% yield.
Because of the rapid hydrolysis of the ester, the reaction should be carried out at pH 4.5, in buffered phosphoric acid the product can even be obtained in virtually quan... | 0 | Organic Chemistry |
Matrix-assisted inlet ionization (MAII) has shown that the laser is not necessary for the ionization process. Ions are formed when matrix-analyte is introduced to the vacuum of a mass spectrometer through an inlet aperture. LSI is a subset of MAII and is now called laserspray inlet ionization (LSII). Laser spray inlet... | 3 | Analytical Chemistry |
Bound to the 5-untranslated region of messenger RNA (mRNA), Morpholinos can interfere with progression of the ribosomal initiation complex from the 5 cap to the start codon. This prevents translation of the coding region of the targeted transcript (called "knocking down" gene expression). This is useful experimentally ... | 1 | Biochemistry |
The polypyrimidine tract is a region of pre-messenger RNA (mRNA) that promotes the assembly of the spliceosome, the protein complex specialized for carrying out RNA splicing during the process of post-transcriptional modification. The region is rich with pyrimidine nucleotides, especially uracil, and is usually 15–20 b... | 1 | Biochemistry |
Abrasive blasting also known as sandblasting, involves using compressed air to fire a steam of clean, sharp, crushed steel grit or aluminum oxide onto the surface of the component. Aluminum is a good option as it is relatively cheap. The fired grit breaks off small chucks of the substrate surface creating an evenly rou... | 8 | Metallurgy |
The solvent is heated to reflux. The solvent vapour travels up a distillation arm, and floods into the chamber housing the thimble of solid. The condenser ensures that any solvent vapour cools, and drips back down into the chamber housing the solid material. The chamber containing the solid material slowly fills with w... | 3 | Analytical Chemistry |
Corrosion Science is a peer-reviewed scientific journal published by Elsevier in 16 issues per year. Established in 1961, it covers a wide range of topics in the study of pure/applied corrosion and corrosion engineering, including but not limited to oxidation, biochemical corrosion, stress corrosion cracking, and corro... | 8 | Metallurgy |
Spatial particle-based methods differ from the methods described above by their explicit representation of space.
One example of a particle-based simulator that allows for a representation of cellular compartments is SRSim. SRSim is integrated in the LAMMPS molecular dynamics simulator and allows the user to specify th... | 1 | Biochemistry |
Via the process known as spontaneous resolution, 5-10% of all racemates crystallize as mixtures of enantiopure crystals. This phenomenon allowed Louis Pasteur to separate left-handed and right-handed sodium ammonium tartrate crystals. These experiments underpinned his discovery of optical activity. In 1882 he went on... | 4 | Stereochemistry |
The invention and widespread application of hydraulic mining, namely hushing and ground-sluicing, aided by the ability of the Romans to plan and execute mining operations on a large scale, allowed various base and precious metals to be extracted on a proto-industrial scale only rarely matched until the Industrial Revol... | 8 | Metallurgy |
The Cariaco Basin in Venezuela has been used to study the cycle of organic material in euxinic marine environments. An increase in productivity coincident with post glacial nutrient loading probably caused a transition from oxic to anoxic and subsequently euxinic conditions around 14.5 thousand years ago. High producti... | 9 | Geochemistry |
The pillar does not bear an inscription mentioning its erector, date or purpose. It is located at Dhar, which was the capital of the Paramara dynasty. According to the local tradition, the pillar commemorates a military victory of the 11th century Paramara king Bhoja, whose knowledge of iron metallurgy can be seen in h... | 8 | Metallurgy |
TOXMAP was a geographic information system (GIS) from the United States National Library of Medicine (NLM) that was deprecated on December 16, 2019. The application used maps of the United States to help users explore data from the United States Environmental Protection Agency's (EPA) Toxics Release Inventory (TRI) and... | 1 | Biochemistry |
In contrast with jawed vertebrates whose immunity is based on variable, diverse, and joining gene segments (VDJs) of immunoglobulins, the jawless invertebrates, such as lamprey and hagfish, create a receptor diversity by somatic DNA rearrangement of leucine-rich repeat (LRR) modules that are incorporate in *vlr* genes ... | 1 | Biochemistry |
Piezoelectricity is the ability of crystals to generate a voltage in response to an applied mechanical stress. The piezoelectric effect is reversible in that piezoelectric crystals, when subjected to an externally applied voltage, can change shape by a small amount. Polymer materials like rubber, wool, hair, wood fiber... | 7 | Physical Chemistry |
The permanent hardness of water is determined by the water's concentration of cations with charges greater than or equal to 2+. Usually, the cations have a charge of 2+, i.e., they are divalent. Common cations found in hard water include Ca and Mg, which frequently enter water supplies by leaching from minerals within... | 3 | Analytical Chemistry |
The element carbon plays a central role in climate and life on Earth. It is capable of moving among and between the geosphere, cryosphere, atmosphere, biosphere and hydrosphere. This flow of carbon is referred to as the Earths carbon cycle. It is also intimately linked to the cycling of other elements and compounds. Th... | 9 | Geochemistry |
Although beneficial for the effectiveness of the reaction, the use of copper salts in "classical" Sonogashira reaction is accompanied with several drawbacks, such as the application of environmentally unfriendly reagents, the formation of undesirable alkyne homocoupling (Glaser side products), and the necessity of str... | 0 | Organic Chemistry |
The shuttle consists of four protein parts:
*malate dehydrogenase in the mitochondrial matrix and intermembrane space.
*aspartate aminotransferase in the mitochondrial matrix and intermembrane space.
*malate-alpha-ketoglutarate antiporter in the inner membrane.
*glutamate-aspartate antiporter in the inner membrane. | 1 | Biochemistry |
It was found that pyruvate dehydrogenase enzyme found in the mitochondria of eukaryotic cells closely resembles an enzyme from Geobacillus stearothermophilus, which is a species of gram-positive bacteria. Despite similarities of the pyruvate dehydrogenase complex with gram-positive bacteria, there is little resemblance... | 1 | Biochemistry |
From the kinetic energy formula it can be shown that
where v is in m/s, T is in kelvin, and m is the mass of one molecule of gas in kg. The most probable (or mode) speed is 81.6% of the root-mean-square speed , and the mean (arithmetic mean, or average) speed is 92.1% of the rms speed (isotropic distribution of speed... | 7 | Physical Chemistry |
Yu was born on January 10, 1966, in Zhejiang, China. He received his B.Sc. in chemistry at East China Normal University in 1987. Yu then went on to the Guangzhou Institute of Chemistry, Chinese Academy of Sciences where he worked on heterogeneous reactions of terpenes with zeolite materials with Prof. Shu-De Xiao, obta... | 0 | Organic Chemistry |
Absolute configuration refers to the spatial arrangement of atoms within a chiral molecular entity (or group) and its resultant stereochemical description. Absolute configuration is typically relevant in organic molecules where carbon is bonded to four different substituents. This type of construction creates two possi... | 4 | Stereochemistry |
Due to the increased demand for iron for casting cannons, the blast furnace came into widespread use in France in the mid 15th century.
The direct ancestor of those used in France and England was in the Namur region, in what is now Wallonia (Belgium). From there, they spread first to the Pays de Bray on the eastern bou... | 8 | Metallurgy |
The Ferrier Research Institute at Victoria University of Wellington was named for Ferrier. It was created on 6 January 2014 to accommodate the group of carbohydrate chemists who left Callaghan Innovation on that date. (Callaghan Innovation was previously Industrial Research Ltd.) | 0 | Organic Chemistry |
In January 2011, the ASTM withdrew standard ASTM D 6002, which had provided plastic manufacturers with the legal credibility to label a plastic as compostable. Its description is as follows:
The ASTM has yet to replace this standard. | 7 | Physical Chemistry |
Sucrose esters are mainly manufactured by using interesterification, the transfer of fatty acid from one ester to another. In this case, it means that the fatty acids used for the synthesis of sucrose esters are themselves in the esterified form. There are three processes that have been developed. | 0 | Organic Chemistry |
Whiskers can cause short circuits and arcing in electrical equipment. The phenomenon was discovered by telephone companies in the late 1940s and it was later found that the addition of lead to tin solder provided mitigation. The European Restriction of Hazardous Substances Directive (RoHS), which took effect on July 1... | 8 | Metallurgy |
The Lifshitz theory can be expressed as an effective Hamaker constant in the van der Waals theory.
Consider, for example, the interaction between an ion of charge , and a nonpolar molecule with polarizability at distance . In a medium with dielectric constant , the interaction energy between a charge and an electric d... | 7 | Physical Chemistry |
R-410A, sold under the trademarked names AZ-20, EcoFluor R410, Forane 410A, Genetron R410A, Puron, and Suva 410A, is a zeotropic but near-azeotropic mixture of difluoromethane (CHF, called R-32) and pentafluoroethane (CHFCF, called R-125) that is used as a refrigerant in air conditioning and heat pump applications. R-4... | 2 | Environmental Chemistry |
In the case of schizophrenia, the overt symptom could be a psychosis, but the underlying phenotypes are, for example, a lack of sensory gating and a decline in working memory. Both of these traits have a clear genetic component and can thus be called endophenotypes. A strong candidate for schizophrenia endophenotype is... | 2 | Environmental Chemistry |
With increasing bainite content in steel, the hardness, yield and tensile strength remain almost constant for bainite content up to 50%, and then increase by ca. 30%. Hence meter-size shafts and plates of high-bainite steels have been commercially mass-produced by Rolls-Royce Holdings and Tata Steel.
In the railway ind... | 8 | Metallurgy |
Protocols for conducting biosurveys of water resources have been published by state government agencies and the U.S. Environmental Protection Agency (EPA). Agencies use these protocols to implement the Clean Water Act. Similar protocols have been published by volunteer organizations. | 2 | Environmental Chemistry |
Urea in concentrations up to 10 M is a powerful protein denaturant as it disrupts the noncovalent bonds in the proteins. This property can be exploited to increase the solubility of some proteins. A mixture of urea and choline chloride is used as a deep eutectic solvent (DES), a substance similar to ionic liquid. When ... | 0 | Organic Chemistry |
Spacecraft waste heat is ultimately rejected to space by radiator surfaces. Radiators can be of different forms, such as spacecraft structural panels, flat-plate radiators mounted to the side of the spacecraft, panels deployed after the spacecraft is on orbit, and droplets.
All radiators reject heat by infrared (IR) r... | 7 | Physical Chemistry |
Lassar Cohn, Lassar-Cohn or Ernst Lassar Cohn (6 September 1858 – 9 October 1922) was a Prussian chemist and professor at the University of Königsberg who wrote several influential textbooks on organic analysis including methods for the analysis of urine.
Cohn was born in the Jewish family of Jacob Marcus Cohen and Han... | 1 | Biochemistry |
Studies testing prophylactic use of lithium in cluster headaches (when compared to verapamil), migraine attacks and hypnic headache indicate good efficacy. | 1 | Biochemistry |
X-ray analysis indicates certain important bond lengths and angles of the first diphosphene, bis(2,4,6-tri-tert-butylphenyl)diphosphene: P-P = 2.034 (2) Å; P-C = 1.826 (2) Å; P-P-C = 102.8 (1); C-P-P-C = 172.2 (1). Compared with the bond length of a P-P single bond in HPPH (2.238 Å), the P-P bond distance is much short... | 0 | Organic Chemistry |
The most efficient subset in TRA presentation and both modes of central tolerance was found to be CD8α thymic-derived DCs (tDCs). This subset was also shown to express XCR1 and to be attracted by mTECs via XCL1 chemokine expression. tDCs rise intrathymically and constitute approximately half of thymic DCs population. | 1 | Biochemistry |
The concept of the detection limit for chemical imaging is quite different from for bulk spectroscopy, as it depends on the sample itself. Because a bulk spectrum represents an average of the materials present, the spectral signatures of trace components are simply overwhelmed by dilution. In imaging however, each pixe... | 7 | Physical Chemistry |
Like esters, most carboxylic acids can be reduced to alcohols by hydrogenation, or using hydride transferring agents such as lithium aluminium hydride. Strong alkyl transferring agents, such as organolithium compounds but not Grignard reagents, will reduce carboxylic acids to ketones along with transfer of the alkyl gr... | 0 | Organic Chemistry |
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