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When hemoglobin is exposed to certain conditions, reversible or irreversible hemichromes are formed.
Reversible hemichrome formation occurs in the presence of:
* Fatty acids
* Aliphatic alcohol (n-butanol)
* Dehydration
* High concentration of glycerol
* Polyethylene glycol
Irreversible hemichrome formation occ... | 1 | Biochemistry |
The duplication and transmission of genetic material from one generation of cells to the next is the basis for molecular inheritance and the link between the classical and molecular pictures of genes. Organisms inherit the characteristics of their parents because the cells of the offspring contain copies of the genes i... | 1 | Biochemistry |
The atmospheric abundance of CFC-115 rose from 8.4 parts per trillion (ppt) in year 2010 to 8.7 ppt in 2020 based on analysis of air samples gathered from sites around the world. | 2 | Environmental Chemistry |
* Guttmann, Y.M. (1999). The Concept of Probability in Statistical Physics, Cambridge University Press, Cambridge UK, . | 7 | Physical Chemistry |
From 1954 until 1971, the Fox River in Appleton, Wisconsin, had PCBs deposited into it from Appleton Paper/NCR, P.H. Gladfelter, Georgia-Pacific and other notable local paper manufacturing facilities. The Wisconsin DNR estimates that after wastewater treatment the PCB discharges to the Fox River due to production losse... | 2 | Environmental Chemistry |
In chemistry, fine chemicals are complex, single, pure chemical substances, produced in limited quantities in multipurpose plants by multistep batch chemical or biotechnological processes. They are described by exacting specifications, used for further processing within the chemical industry and sold for more than $10/... | 0 | Organic Chemistry |
The CRFs in thin layer chromatography characterize the equal-spreading of the spots. The ideal case, when the RF of the spots are uniformly distributed in <0,1> range (for example 0.25,0.5 and 0.75 for three solutes) should be characterized as the best situation possible.
The simplest criteria are and product (Wang e... | 3 | Analytical Chemistry |
Cyclohexene derivatives, such as imines, epoxides, and halonium ions, react with nucleophiles in a stereoselective fashion, affording trans-diaxial addition products. The term “Trans-diaxial addition” describes the mechanism of the addition, however the products are likely to equilibrate by ring flip to the lower ener... | 4 | Stereochemistry |
CKLF-like MARVEL transmembrane domain-containing protein 3 (i.e. CMTM3), also termed chemokine-like factor superfamily 3 (i.e. CKLFSF3), is a member of the CKLF-like MARVEL transmembrane domain-containing family (i.e. CMTM) of proteins. In humans, CMTM2 protein is encoded by the CMTM3 gene located in band 22.1 on the ... | 1 | Biochemistry |
In order to access the nucleosomal DNA, the bonds between it and the histone octamer must be broken. This change takes place periodically in the cell as specific regions are transcribed, and it happens genome-wide during replication. Remodeling proteins work in three distinct ways: they can slide the DNA along the surf... | 1 | Biochemistry |
The structure of a protein-coding gene consists of many elements of which the actual protein coding sequence is often only a small part. These include introns and untranslated regions of the mature mRNA. Noncoding genes can also contain introns that are removed during processing to produce the mature functional RNA.
Al... | 1 | Biochemistry |
Xi Zhenfeng (; born April 2, 1963, in Henan) is a Chinese organic chemist.
Xi received his B.S. degree from Xiamen University in 1983, and his M.S. degree from Nanjing University, Zhengzhou University and Henan Institute of Chemistry in 1989. He joined Professor Tamotsu Takahashi's group at the Institute for Molecular ... | 0 | Organic Chemistry |
The European Congress on Molecular Spectroscopy (EUCMOS) is held every two years. The first Congress in this series was held in Basel (Switzerland) in 1951. It focuses on all aspects of spectroscopic methods and techniques (including applications), as well as computational and theoretical approaches for the investigati... | 7 | Physical Chemistry |
* Loading: Analogous to the starting stage, each module loads its specific amino acid onto its PCP-domain.
* Condensation: The C-domain catalyzes the amide bond formation between the thioester group of the growing peptide chain from the previous module with the amino group of the current module. The extended peptide is... | 1 | Biochemistry |
TEOS-10 is based on thermodynamic potentials. Fluids like humid air and liquid water in TEOS-10 are therefore described by the Helmholtz energy F(m,T,V)=F(m,T,m/ρ) or the specific Helmholtz-energy f(T,ρ)=F(m,T,m/ρ)/m. The Helmholtz energy has a unique value across phase boundaries. For the calculation of the thermodyna... | 7 | Physical Chemistry |
A lattice arrangement (commonly called a regular arrangement) is one in which the centers of the spheres form a very symmetric pattern which needs only n vectors to be uniquely defined (in n-dimensional Euclidean space). Lattice arrangements are periodic. Arrangements in which the spheres do not form a lattice (often r... | 3 | Analytical Chemistry |
Galling is often found between metallic surfaces where direct contact and relative motion have occurred. Sheet metal forming, thread manufacturing, and other industrial operations may include moving parts, or contact surfaces made of stainless steel, aluminium, titanium, and other metals whose natural development of an... | 7 | Physical Chemistry |
Oxide dispersion strengthening is based on incoherency of the oxide particles within the lattice of the material. Coherent particles have a continuous lattice plane from the matrix to the particles whereas incoherent particles do not have this continuity and therefore both lattice planes end at the interface. This mism... | 8 | Metallurgy |
In addition to anchoring artificial metal center on a protein, researchers like Frances Arnold also focused on changing the native environment of natural metal cofactor. Due to the protein context in which the metal catalytic center located, ArMs have a large sequence space to evolve to meet different demands on substa... | 0 | Organic Chemistry |
Flickering analysis of cellular or membranous structures is a widespread technique for measuring the bending modulus and other properties from the power spectrum of thermal fluctuations.
First demonstrated theoretically by Brochard and Lennon in 1975, flickering spectroscopy has become a widespread technique due to its... | 7 | Physical Chemistry |
A quantity of sample is weighed, placed in a crucible, and subjected to destructive distillation. During a fixed period of severe heating, the residue undergoes cracking and coking reactions . At the termination of the heating period, the crucible containing the carbonaceous residue is cooled in a desiccator and weighe... | 9 | Geochemistry |
The fractional population distribution of different conformers follows a Boltzmann distribution:
The left hand side is the proportion of conformer i in an equilibrating mixture of M conformers in thermodynamic equilibrium. On the right side, E (k = 1, 2, ..., M) is the energy of conformer k, R is the molar ideal gas c... | 4 | Stereochemistry |
Human iron metabolism is the set of chemical reactions that maintain human homeostasis of iron at the systemic and cellular level. Iron is both necessary to the body and potentially toxic. Controlling iron levels in the body is a critically important part of many aspects of human health and disease. Hematologists have... | 1 | Biochemistry |
Generally, nucleophilic epoxidations are carried out under inert atmosphere in anhydrous conditions. For zinc-mediated epoxidations, diethylzinc and ligand are first mixed and oxidized, then the enone is introduced. Lanthanide-mediated epoxidations typically require an additive to stabilize the catalyst; this is most c... | 0 | Organic Chemistry |
The American Brass Superfund site is a former industrial site, located in Henry County, Alabama. American Brass Inc. (ABI) operated a brass smelter and foundry facility on the site between 1978 and 1992. Prior to its closure in December 1992, the company had been cited by the United States Environmental Protection Age... | 2 | Environmental Chemistry |
The first committed step of purine biosynthesis starts from 5-phosphoribosyl 1 pyrophosphate. This undergoes a series of reactions to form IMP, an important branch point in the pathway. The pathway then branches to form adenylosuccinate and then adenylate (AMP) in one branch and xanthylate (XMP) and then guanylate (GMP... | 1 | Biochemistry |
In subsequent phase II reactions, these activated xenobiotic metabolites are conjugated with charged species such as glutathione (GSH), sulfate, glycine, or glucuronic acid. Sites on drugs where conjugation reactions occur include carboxy (-COOH), hydroxy (-OH), amino (NH), and thiol (-SH) groups. Products of conjugati... | 1 | Biochemistry |
In organic chemistry, Eschenmoser's salt (named for Albert Eschenmoser) is the ionic, organic compound . It is the iodide salt of the dimethylaminomethylene cation .
The dimethylaminomethylene cation is a strong dimethylaminomethylating agent, used to prepare derivatives of the type . Enolates, silyl enol ethers, and... | 0 | Organic Chemistry |
* Relative entropy is always non-negative, a result known as Gibbs' inequality, with equals zero if and only if as measures.
In particular, if and , then -almost everywhere. The entropy thus sets a minimum value for the cross-entropy , the expected number of bits required when using a code based on rather than ;... | 7 | Physical Chemistry |
Generally pyridinium photoinitiators are N-substituted pyridine derivatives, with a positive charge placed on the nitrogen. The counter ion is in most cases a non-nucleophilic anion. Upon radiation, homolytic bond cleavage takes place generating a pyridinium cationic radical and a neutral free radical. In most cases, a... | 5 | Photochemistry |
Schlögl was one of the pioneers of the research into the geometric structure of organic compounds and the resulting mechanisms of their chemical reactions. He has been very successful with his work on new pharmaceutical substances.
Schlögl authored and co-authored over 200 scientific publications and was an inventor on... | 0 | Organic Chemistry |
In two dimensions, any lattice can be specified by the length of its two primitive translation vectors and the angle between them. There are an infinite number of possible lattices one can describe in this way. Some way to categorize different types of lattices is desired. One way to do so is to recognize that some lat... | 3 | Analytical Chemistry |
The cleanup process started when there was a survey of Manhattan Project sites. The plant was inspected in 1976 and found low levels of radiation. Westinghouse filed an application in 1988 with the Nuclear Regulatory Commission (NRC) to decommission those buildings. The demolition of the buildings was done from 1993 th... | 8 | Metallurgy |
Bacteriorhodopsin is a light-driven proton pump. It is the retinal molecule that changes its isomerization state from all-trans to 13-cis when it absorbs a photon. The surrounding protein responds to the change in the chromophore shape, by undergoing an ordered sequence of conformational changes (collectively known as ... | 5 | Photochemistry |
EAB sensors possess the potential to significantly advance our comprehension of metabolism, endocrinology, pharmacokinetics, and neurochemistry as valuable research tools. Specifically, these sensors offer improved resolution and more quantitative measurements of phenomena such as drug delivery, clearance, and the main... | 7 | Physical Chemistry |
For virus-associated tumors, such as cervical cancer and a subset of head and neck cancers, epitopes derived from viral open reading frames contribute to the pool of neoantigens. | 1 | Biochemistry |
In a variation, the Ruff–Fenton degradation (Otto Ruff 1898, H.J.H. Fenton 1893) converts the aldose first to the alpha-hydroxy-carboxylic acid with bromine and calcium hydroxide and then to the shortened aldose by reaction with Iron(III) sulfate and hydrogen peroxide. | 0 | Organic Chemistry |
Chiral inversion is a very important part of designing and making drugs. Because this process can change how chiral drugs work in the body and can cause side effects that can be serious or even fatal. Traditionally, chiral inversions have been studied with NMR spectroscopy at different temperatures and chiroptical meth... | 4 | Stereochemistry |
TopFIND is a resource for comprehensive coverage of protein N- and C-termini discovered by all available in silico, in vitro as well as in vivo methodologies. It makes use of existing knowledge by seamless integration of data from UniProt and MEROPS and provides access to new data from community submission and manual l... | 1 | Biochemistry |
Theodore Cohen (May 11, 1929 – December 13, 2017) was an American organic chemist and chemistry professor at University of Pittsburgh. He is known for his research on organic chemistry, and particularly on organosulfur compounds, on organometallic chemistry, and on the synthesis of phenols. | 0 | Organic Chemistry |
Nutrition polysaccharides are common sources of energy. Many organisms can easily break down starches into glucose; however, most organisms cannot metabolize cellulose or other polysaccharides like cellulose, chitin, and arabinoxylans. Some bacteria and protists can metabolize these carbohydrate types. Ruminants and te... | 0 | Organic Chemistry |
Marine carbonate ooids are formed in warm, supersaturated, shallow, highly agitated marine water intertidal environments, and their presence in geological records provides a key role in paleoclimatic and paleogeographic reconstructions. Huang et al. (2017), for example, based on the distribution of Permian ooids and gl... | 9 | Geochemistry |
Endoglin (ENG) is a type I membrane glycoprotein located on cell surfaces and is part of the TGF beta receptor complex. It is also commonly referred to as CD105, END, FLJ41744, HHT1, ORW and ORW1. It has a crucial role in angiogenesis, therefore, making it an important protein for tumor growth, survival and metastasis ... | 1 | Biochemistry |
Sex pheromones are pheromones released by an organism to attract an individual of the same species, encourage them to mate with them, or perform some other function closely related with sexual reproduction.
Sex pheromones specifically focus on indicating females for breeding, attracting the opposite sex, and conveying ... | 1 | Biochemistry |
Restriction digest is most commonly used as part of the process of the molecular cloning of DNA fragment into a vector (such as a cloning vector or an expression vector). The vector typically contains a multiple cloning site where many restriction site may be found, and a foreign piece of DNA may be inserted into the ... | 1 | Biochemistry |
Progesterone is produced in high amounts in the ovaries (by the corpus luteum) from the onset of puberty to menopause, and is also produced in smaller amounts by the adrenal glands after the onset of adrenarche in both males and females. To a lesser extent, progesterone is produced in nervous tissue, especially in the ... | 0 | Organic Chemistry |
Several pyridine derivatives play important roles in biological systems. While its biosynthesis is not fully understood, nicotinic acid (vitamin B) occurs in some bacteria, fungi, and mammals. Mammals synthesize nicotinic acid through oxidation of the amino acid tryptophan, where an intermediate product, the aniline de... | 0 | Organic Chemistry |
Zofenopril (INN) is a medication that protects the heart and helps reduce high blood pressure. It is an angiotensin-converting enzyme (ACE) inhibitor.
In small studies, zofenopril appeared significantly more effective in reducing hypertension than two older antihypertensive drugs, atenolol and enalapril, and was associ... | 4 | Stereochemistry |
Chemical mimicry can also have benefits on the reproductive success of the operator. This form is used primarily by flowers in order to deceive pollinators. There are two main types, the first being pseudocopulation which involves attracting male pollinators by mimicking the pheromones of females of the species. The se... | 1 | Biochemistry |
Texture can be determined by various methods. Some methods allow a quantitative analysis of the texture, while others are only qualitative. Among the quantitative techniques, the most widely used is X-ray diffraction using texture goniometers, followed by the electron backscatter diffraction (EBSD) method in scanning e... | 8 | Metallurgy |
Besides chemical bonds, compliance constants are also useful for determining non-covalent bonds, such as H-bonds in Watson-Crick base pairs. Grunenberg calculated the compliance constant for each of the donor-H⋯acceptor linkages in AT and CG base pairs and found that the central N-H⋯N bond in CG base pair is the strong... | 6 | Supramolecular Chemistry |
C5a is an anaphylatoxin, causing increased expression of adhesion molecules on endothelium, contraction of smooth muscle, and increased vascular permeability. C5a des-Arg is a much less potent anaphylatoxin. Both C5a and C5a des-Arg can trigger mast cell degranulation, releasing proinflammatory molecules histamine and ... | 1 | Biochemistry |
Favipiravir has been approved to treat influenza in Japan. It is, however, only indicated for novel influenza (strains that cause more severe disease) rather than seasonal influenza. As of 2020, the probability of resistance developing appears low. | 4 | Stereochemistry |
Despite current understanding of 3′-UTRs, they are still relative mysteries. Since mRNAs usually contain several overlapping control elements, it is often difficult to specify the identity and function of each 3′-UTR element, let alone the regulatory factors that may bind at these sites. Additionally, each 3′-UTR conta... | 1 | Biochemistry |
Guanylin is a 15 amino acid peptide that is secreted by goblet cells in the colon. Guanylin acts as an agonist of the guanylyl cyclase receptor GC-C and regulates electrolyte and water transport in intestinal and renal epithelia. Upon receptor binding, guanylin increases the intracellular concentration of cGMP, induces... | 1 | Biochemistry |
Signal peptides are usually located at the N-terminus of proteins. Some have C-terminal or internal signal peptides (examples: peroxisomal targeting signal and nuclear localisation signal). The structure of these nonclassical signal peptides differs vastly from the N-terminal signal peptides. | 1 | Biochemistry |
Xing Qiyi () was a Chinese organic chemist who contributed to the total synthesis of bovine insulin, Xing is still well-known nowadays in China as the main editor of a highly-influential organic chemistry textbook. He was a member of China Democratic League since 1952. | 0 | Organic Chemistry |
Non ideal compressible fluid dynamics (NICFD), or non ideal gas dynamics, is a branch of fluid mechanics studying the dynamic behavior of fluids not obeying ideal-gas thermodynamics. It is for example the case of dense vapors, supercritical flows and compressible two-phase flows. With the term dense vapors, we indicate... | 7 | Physical Chemistry |
The idea of interstitial compounds was started in the late 1930s and they are often called Hagg phases after Hägg. Transition metals generally crystallise in either the hexagonal close packed or face centered cubic structures, both of which can be considered to be made up of layers of hexagonally close packed atoms. In... | 8 | Metallurgy |
Sauvagine is a neuropeptide from the corticotropin-releasing factor (CRF) family of peptides and is orthologous to the mammalian hormone, urocortin 1, and the teleost fish hormone, urotensin 1. It is 40 amino acids in length, and has the sequence XGPPISIDLSLELLRKMIEIEKQEKEKQQAANNRLLLDTI-NH2, with a pyrrolidone carboxyl... | 1 | Biochemistry |
Using correlation diagrams one can derive selection rules for the following generalized classes of pericyclic reactions. Each of these particular classes is further generalized in the generalized Woodward–Hoffmann rules. The more inclusive bond topology descriptors antarafacial and suprafacial subsume the terms conro... | 7 | Physical Chemistry |
The active component, eslicarbazepine, has the same mechanism of action as oxcarbazepine (which is a prodrug for licarbazepine, the racemate of eslicarbazepine) and most likely the closely related carbamazepine. It stabilises the inactive state of voltage-gated sodium channels, allowing for less sodium to enter neural ... | 4 | Stereochemistry |
The alloy has the highest magnetostriction of any alloy, up to 0.002 m/m at saturation; it expands and contracts in a magnetic field. Terfenol-D has a large magnetostriction force, high energy density, low sound velocity, and a low Youngs modulus. At its most pure form, it also has low ductility and a low fracture resi... | 8 | Metallurgy |
Thioglycosides were first reported in 1909 by Fischer and since then have been explored constantly allowing for the development of numerous protocols for their preparation.
The advantage of using thioglycosides is their stability under a wide range of reaction conditions allowing for protecting group manipulations. Ad... | 0 | Organic Chemistry |
Broadband high-resolution spectrometers were developed in 2000 and commercialized in 2003. Designed for material analysis, the spectrometer allowed the LIBS system to be sensitive to chemical elements in low concentration.
ARL LIBS applications studied from 2000 to 2010 included:
* Tested for detection of Halon alterna... | 7 | Physical Chemistry |
The interplay of molecular scale mechanisms and hierarchical surface structures is known to result in high levels of static friction and bonding between pairs of surfaces. Technologically advanced adhesive devices sometimes make use of microstructures on surfaces, such as tightly packed periodic posts. These are biomim... | 6 | Supramolecular Chemistry |
Several indices to measure bioavailability have been suggested: Respiration Index, Oxygen Supply Index, and the Metabolic Index. The Respiration Index describes oxygen availability based on the free energy available in the reactants and products of the stoichiometric equation for respiration. However, organisms have wa... | 9 | Geochemistry |
* Novosil is a stimulant of plant immunity and growth. It is also used in the fight against plant viruses. The product was developed by the Institute together with the Institute of Cytology and Genetics in 1992. It is used in various regions of Russia, as well as in Kazakhstan, Belarus, Ukraine and Georgia.
* Acrylate-... | 0 | Organic Chemistry |
Among the proteins recruited to polymerase are elongation factors, thus called because they stimulate transcription elongation. There are different classes of elongation factors. Some factors can increase the overall rate of transcribing, some can help the polymerase through transient pausing sites, and some can assist... | 1 | Biochemistry |
Plumbides can be formed when lead forms a Zintl phase compound with a more metallic element. One salt that can be formed this way is when cryptand reacts with sodium and lead in ethylenediamine (en) to produce [Pb], which is red in solution.
Lead can also create anions with tin, in a series of anions with the formula [... | 7 | Physical Chemistry |
NPP catalyses the nucleophilic substitution of one ester bond on a phosphodiester substrate. It has a nucleoside binding pocket that excludes phospholipid substrates from the active site. A threonine nucleophile has been identified through site-directed mutagenesis, and the reaction inverts the stereochemistry of the p... | 1 | Biochemistry |
In addition to using TNP-ATP to determine whether a protein binds ATP, its binding affinity and dissociation constants, and number of binding sites, TNP-ATP can also be used in ligand binding studies. To do this, titrations of the protein are added to TNP-ATP. Then, ligand is added to displace the bound analog. This is... | 7 | Physical Chemistry |
The Journal of Physical Chemistry Letters publishes letters, perspectives on emerging topics, editorials and viewpoints. Specific materials of interest will include, but are not limited to:
* Physical Insights into Quantum Phenomena and Function
* Physical Insights into Materials and Molecular Properties
* Physical Ins... | 7 | Physical Chemistry |
NAD+ 5’ capped RNA have been found in yeast, humans, and Arabidopsis thaliana. In eukaryotes, the NAD+ cap is removed by non-canonical decapping enzymes from the DXO family. DeNADing by DXO results in a 5’ end monophosphate RNA distinct from NudC which results in NMN plus 5′ monophosphate RNA. Importantly, DXO is ~6 fo... | 1 | Biochemistry |
International commerce of sulfuric acid is controlled under the United Nations Convention Against Illicit Traffic in Narcotic Drugs and Psychotropic Substances, 1988, which lists sulfuric acid under Table II of the convention as a chemical frequently used in the illicit manufacture of narcotic drugs or psychotropic sub... | 7 | Physical Chemistry |
An Interest Group Macromolecules (EBF-IGM) was founded in 2008 to provide a platform for scientific exchange and harmonization of specific aspects for the bioanalysis of macromolecules: drugs and biomarkers as well as immunogenicity testing. | 3 | Analytical Chemistry |
Palladacycle, as a class of metallacycles, refers to complexes containing at least one carbon-palladium bond. Palladacycles are invoked as intermediates in catalytic or palladium mediated reactions. They have been investigated as pre-catalysts for homogeneous catalysis and synthesis. | 0 | Organic Chemistry |
Freshwater environmental quality parameters are those chemical, physical or biological parameters that can be used to characterise a freshwater body. Because almost all water bodies are dynamic in their composition, the relevant quality parameters are typically expressed as a range of expected concentrations.
They incl... | 2 | Environmental Chemistry |
The high-frequency impact treatment or HiFIT – Method is the treatment of welded steel constructions at the weld transition to increase the fatigue strength. | 8 | Metallurgy |
The semiconductor is a collective term for a series of devices. It mainly includes three categories：two-terminal devices, three-terminal devices, and four-terminal devices. The combination of the semiconductors is called an integrated circuit.
The relationship between Ficks law and semiconductors: the principle of the... | 7 | Physical Chemistry |
*O'Callaghan, Amy; van Sinderen, Douwe (2016). Bifidobacteria and Their Role as Members of the Human Gut Microbiota. Frontiers in Microbiology, 7,
*Paul György; Robert F. Norris; Catharine S. Rose (1954). Bifidus factor. I. A variant of Lactobacillus bifidus requiring a special growth factor, 48 (1), 193–201. | 1 | Biochemistry |
Translational control is critical for the development and survival of cancer. Cancer cells must frequently regulate the translation phase of gene expression, though it is not fully understood why translation is targeted over steps like transcription. While cancer cells often have genetically altered translation factors... | 1 | Biochemistry |
Blue carbon is a concept within climate change mitigation that refers to "biologically driven carbon fluxes and storage in marine systems that are amenable to management." Most commonly, it refers to the role that tidal marshes, mangroves and seagrasses can play in carbon sequestration. These ecosystems can play an imp... | 9 | Geochemistry |
One modification of the Hiyama coupling utilizes a silacyclobutane ring and a fluoride source that is hydrated as shown below. This mimics the use of an alkoxysilane/organosilanol rather than the use of alkylsilane. The mechanism of this reaction, using a fluoride source, allowed for the design of future reactions that... | 0 | Organic Chemistry |
In Swedish Uppland north of Stockholm and certain adjacent provinces, another kind known as the Walloon forge was used, mainly for the production of a particularly pure kind of iron known as oregrounds iron, which was exported to England to make blister steel. Its purity depended on the use of ore from the Dannemora m... | 8 | Metallurgy |
tert-Butyldimethylsilyl chloride is an organosilicon compound with the formula (MeC)MeSiCl (Me = CH). It is commonly abbreviated as TBSCl or TBDMSCl. It is a chlorosilane containing two methyl groups and a tert-butyl group. As such it is more bulky that trimethylsilyl chloride. It is a colorless or white solid that i... | 0 | Organic Chemistry |
Crystallographic Information File (CIF) is a standard text file format for representing crystallographic information, promulgated by the International Union of Crystallography (IUCr). CIF was developed by the IUCr Working Party on Crystallographic Information in an effort sponsored by the IUCr Commission on Crystallogr... | 3 | Analytical Chemistry |
Jay Quade was born and grew up in Nevada. As a teenager, he set two all-time Nevada State high school track and field records. At the University of New Mexico, he had a track scholarship, for four years. He was twice an NCAA All-American in track and once an NCAA champion in track (relay race). In 1977 he became a geol... | 9 | Geochemistry |
In chemistry, a leaving group is defined by the IUPAC as an atom or group of atoms that detaches from the main or residual part of a substrate during a reaction or elementary step of a reaction. However, in common usage, the term is often limited to a fragment that departs with a pair of electrons in heterolytic bond ... | 0 | Organic Chemistry |
The heat evolved when an aliquot of host solution is added to a solution containing the guest is the sum of contributions from each reaction
where is a measured heat change value (corrected for all extraneous heat contributions) at data point j, is the amount of heat absorbed or emitted when 1 mole of the ith reactio... | 6 | Supramolecular Chemistry |
A simple substance (like water) may exist in equilibrium with its thermal decomposition products, effectively halting the decomposition. The equilibrium fraction of decomposed molecules increases with the temperature.
Since thermal decomposition is a kinetic process, the observed temperature of its beginning in most in... | 7 | Physical Chemistry |
UIT was originally developed in 1972 and has since been perfected by a team of Russian scientists under the leadership of Dr. Efim Statnikov. Originally developed and utilized to enhance the fatigue and corrosion attributes of ship and submarine structures, UIT has been utilized in aerospace, mining, offshore drilling,... | 8 | Metallurgy |
Light crude oils have higher API gravity figures, due to having fewer impurities. It is more commonly used to produce diesel and gasoline than heavier oils are. Due to its lower viscosity, it is easier to extract and to transport. | 9 | Geochemistry |
As other species of sulfur at intermediate oxidation state, such as thiosulfate, tetrathionate can be responsible for the pitting corrosion of carbon steel and stainless steel.
Tetrathionate has also been found to serve as a terminal electron acceptor for Salmonella enterica serotype Typhimurium, whereas existing thios... | 8 | Metallurgy |
The story addresses a lot of recent scientific breakthroughs, and uses them as plot devices. For instance, The Human Genome Project, which documents all the genes and DNA in the human genetic makeup, is talked about when Dr. Wyatt explains his genetic testing to Eli for the first time. Scientific American recently pu... | 1 | Biochemistry |
From 2001 to 2007, nickel prices rose from an average of US$5945 to US$37,216. Nickel is a key constituent of 316L stainless steel. This, combined with increases in some of the other constituents of the 316L alloy, prompted Xstrata Technology (by then the marketing organisation for the Isa Process technology) to seek a... | 8 | Metallurgy |
The refrigeration capacity of a refrigeration system is the product of the evaporators enthalpy rise and the evaporators mass flow rate. The measured capacity of refrigeration is often dimensioned in the unit of kW or BTU/h. Domestic and commercial refrigerators may be rated in kJ/s, or Btu/h of cooling. For commercial... | 7 | Physical Chemistry |
In medicine, phosphonates and bisphosphonates are commonly used as inhibitors of enzymes which utilize phosphates and diphosphates as substrates. Most notably, these enzymes include those that produce the intermediates of cholesterol biosynthesis.
Phosphonate nucleotide analogues such as tenofovir, cidofovir and adefov... | 0 | Organic Chemistry |
The dependence of the water ionization on temperature and pressure has been investigated thoroughly. The value of pK decreases as temperature increases from the melting point of ice to a minimum at c. 250 °C, after which it increases up to the critical point of water c. 374 °C. It decreases with increasing pressure.
Wi... | 7 | Physical Chemistry |
In mass spectrometry, matrix-assisted laser desorption/ionization (MALDI) is an ionization technique that uses a laser energy-absorbing matrix to create ions from large molecules with minimal fragmentation. It has been applied to the analysis of biomolecules (biopolymers such as DNA, proteins, peptides and carbohydrate... | 1 | Biochemistry |
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