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A thermochemical equation is a balanced stoichiometric chemical equation that represents the energy changes from a system to its surroundings. One such equation involves the enthalpy change, which is denoted with ΔH. In variable form, a thermochemical equation would appear similar to the following:
:A + B → C
:ΔH = (±)... | 7 | Physical Chemistry |
Stanley Robert Hart (born 20 June 1935 in Swampscott, Massachusetts) is an American geologist, geochemist, leading international expert on mantle isotope geochemistry, and pioneer of chemical geodynamics. | 9 | Geochemistry |
An intron is any nucleotide sequence within a gene that is not expressed or operative in the final RNA product. The word intron is derived from the term agenic regi, i.e., a region inside a gene. The term intron refers to both the DNA sequence within a gene and the corresponding RNA sequence in RNA transcripts. The non... | 1 | Biochemistry |
A durable plaster intermediate is often used as a stage toward the production of a bronze sculpture or as a pointing guide for the creation of a carved stone. With the completion of a plaster, the work is more durable (if stored indoors) than a clay original which must be kept moist to avoid cracking. With the low cost... | 8 | Metallurgy |
It has been shown that survivin can heterodimerize individually with the two splice variants Survivin-2B and survivin-deltaEx3. Evidence of the heterodimerization of survivin splice variants with survivin was shown with co-immunoprecipitation experiments after cotransfection with the respective survivin variants with s... | 1 | Biochemistry |
2α-Mannobiose is a disaccharide. It is formed by a condensation reaction, when two mannose molecules react together, in the formation of a glycosidic bond. | 1 | Biochemistry |
The sample is dissolved in water, or a mixture of water and ethanol, and a few drops of neutral ferric chloride (FeCl) solution, which is prepared by adding de-ionised water. Add sodium hydroxide to the mixture until a permanent brown precipitate is formed. The formation of a red, blue, green, or purple coloration indi... | 3 | Analytical Chemistry |
At the time of development in the nineteenth century, the superscript Plimsoll symbol () was adopted to indicate the non-zero nature of the standard state. IUPAC recommends in the 3rd edition of Quantities, Units and Symbols in Physical Chemistry a symbol which seems to be a degree sign (°) as a substitute for the plim... | 7 | Physical Chemistry |
GDP-mannose is produced from GTP and mannose-6-phosphate by the enzyme mannose-1-phosphate guanylyltransferase.
One of the enzymes from the family of nucleootidyl-transferases, GDP-Mannose Pyrophosphorylase (GDP-MP) is an pervasive enzyme found in bacteria, fungi, plants, and animals. | 1 | Biochemistry |
A shadow wall is created when a light flashes upon a person or object in front of a phosphorescent screen which temporarily captures the shadow. The screen or wall is painted with a glow-in-the-dark product that contains phosphorescent compounds. Publicly, these shadow walls can be found at certain science museums. | 7 | Physical Chemistry |
This method is based on magnetic resonance imaging of the distribution of ions comprising NMR-active nuclei (usually 1H, 19F, 7Li) in an electrochemical cells upon application of electric current | 7 | Physical Chemistry |
* Phase equilibria data (vapor–liquid, liquid–liquid, solid–liquid), data on azeotropy and zeotropy
* Mixing enthalpies
* Gas solubilities
* Activity coefficients at infinite dilution
* Heat capacities and excess heat capacities
* Volumes, densities, and excess volumes (volume effect of mixing)
* Salt solubilities
* Oc... | 7 | Physical Chemistry |
Few rocks were visible on the surface where Opportunity landed, but bedrock that was exposed in craters was examined by the suite of instruments on the Rover. Bedrock rocks were found to be sedimentary rocks with a high concentration of sulfur in the form of calcium and magnesium sulfates. Some of the sulfates that m... | 9 | Geochemistry |
* [http://grotrian.nsu.ru/en Electronic structure of atoms]
* [https://physics.nist.gov/PhysRefData/ASD/lines_form.html NIST Atomic Spectra Database Lines Form]
* [https://www.physics.unlv.edu/~jeffery/astro/atomic/grotrian/grotrian.html Grotrian Diagrams] | 7 | Physical Chemistry |
Afovirsen is an oligonucleotide capable of antisense interactions with mRNA of human papillomavirus. It has been investigated as a tool for diagnostics and therapeutics. | 0 | Organic Chemistry |
The effect was first observed by Jencks and Carriuolo in 1960 in a series of chemical kinetics experiments involving the reaction of the ester p-nitrophenyl acetate with a range of nucleophiles. Regular nucleophiles such as the fluoride anion, aniline, pyridine, ethylene diamine and the phenolate ion were found to have... | 7 | Physical Chemistry |
Dr. Raymond U. Lemieux was born in Lac La Biche, Alberta, Canada. His family moved to Edmonton, Alberta in 1926. He studied chemistry at the University of Alberta and received a BSc with Honours in Chemistry in 1943. He went on to study at McGill University, where he received his PhD in Organic Chemistry in 1946. H... | 0 | Organic Chemistry |
In a semiconductors, if all oscillations have the same eigenfrequency and the broadening in the imaginary part of the dielectric function results only from a finite damping , the system is said to be homogeneously broadened, and has a Lorentzian profile. If the system contains many oscillators with slightly differen... | 7 | Physical Chemistry |
Cyclic AMP-dependent protein kinases (protein kinase A) are activated by the signal chain coming from the G protein (that was activated by the FSH-receptor) via adenylate cyclase and cyclic AMP (cAMP).
These protein kinases are present as tetramers with two regulatory units and two catalytic units. Upon binding of cAM... | 1 | Biochemistry |
Although it is difficult to generalize on the toxicity of such a broad class of compounds, simple ketones are, in general, not highly toxic. This characteristic is one reason for their popularity as solvents. Exceptions to this rule are the unsaturated ketones such as methyl vinyl ketone with of 7 mg/kg (oral). | 0 | Organic Chemistry |
Nonclassical describes those carbonyl complexes where ν is higher than that for free carbon monoxide. In nonclassical CO complexes, the C-O distance is shorter than free CO (113.7 pm). The structure of [Fe(CO)], with d = 112.9 pm, illustrates this effect. These complexes are usually cationic, sometimes dicationic. | 0 | Organic Chemistry |
The majority of plants possessing CAM are either epiphytes (e.g., orchids, bromeliads) or succulent xerophytes (e.g., cacti, cactoid Euphorbias), but CAM is also found in hemiepiphytes (e.g., Clusia); lithophytes (e.g., Sedum, Sempervivum); terrestrial bromeliads; wetland plants (e.g., Isoetes, Crassula (Tillaea), Lobe... | 5 | Photochemistry |
Oxacillin, a derivative of methicillin, was first synthesized in the early 1960s as part of a research initiative led by Peter Doyle and John Naylor of Beecham, in consort with Bristol-Myers. Members of the isoxazolyl penicillin family, which includes cloxacillin, dicloxacillin, and oxacillin, were synthesized to count... | 4 | Stereochemistry |
The rate and outcome of chemical reactions taking place in water often depends on the acidity of the water, and it is therefore useful to know the acidity of the water, typically measured by means of a pH meter. Knowledge of pH is useful or critical in many situations, including chemical laboratory analyses. pH meters... | 7 | Physical Chemistry |
A centisome is a unit of length defined as one percent of the length of a particular chromosome. This course unit of physical DNA length began to be used in the early exploration of genomes through molecular biology before the resolution of the nucleic acid sequences of chromosomes was possible.
One of the main uses ... | 1 | Biochemistry |
Centrifugal partition chromatography does not uses any solid stationary phase, so it guarantees a cost-effective separation for the highest industrial levels. As opposed to countercurrent chromatography, it is possible to get very high flow rates (for example 10 liters / min) with active stationary phase ratio of >80%,... | 3 | Analytical Chemistry |
Hyperpolarization-activated cyclic nucleotide–gated (HCN) channels are integral membrane proteins that serve as nonselective voltage-gated cation channels in the plasma membranes of heart and brain cells. HCN channels are sometimes referred to as pacemaker channels because they help to generate rhythmic activity within... | 1 | Biochemistry |
The microdialysis technique has undergone much development since its first use in 1972, when it was first employed to monitor concentrations of endogenous biomolecules in the brain. Today's area of application has expanded to monitoring free concentrations of endogenous as well as exogenous compounds in virtually any t... | 1 | Biochemistry |
While the high-selectivity and tight-binding of RNA aptamers have generated interest in their use as pharmaceuticals, there are many problems which have prevented them from being successful in vivo. For one, without modifications RNA aptamers are degraded after being introduced into the body by nucleases in the span of... | 1 | Biochemistry |
HVAF coating technology is the combustion of propane in a compressed air stream. Like HVOF, this produces a uniform high velocity jet. HVAF differs by including a heat baffle to further stabilize the thermal spray mechanisms. Material is injected into the air-fuel stream and coating particles are propelled toward the p... | 8 | Metallurgy |
Glasses are amorphous solids, which are usually fabricated when the molten material cools very rapidly to below its glass transition temperature, without sufficient time for a regular crystal lattice to form. Solids are characterised by a high degree of connectivity between their molecules, and fluids have lower connec... | 7 | Physical Chemistry |
The 6 of the 11 metabolic intermediates in reverse Krebs cycle promoted by Fe, Zn, and Cr in acidic conditions imply that protocells possibly emerged in locally metal-rich and acidic terrestrial hydrothermal fields. The acidic conditions are seemingly consistent with the stabilization of RNA. These hydrothermal fields ... | 1 | Biochemistry |
Hydrogen forms whenever molten aluminium comes into contact with water vapor, and easily dissolves into the melt. The gas tends to come out of the solution and forms bubbles when the melt solidifies.
The detrimental effects arising from the presence of an excess of dissolved hydrogen in aluminium are numerous. Hydrogen... | 8 | Metallurgy |
The first step in analysis is the introduction of the sample. This has been achieved in ICP-MS through a variety of means.
The most common method is the use of analytical nebulizers. Nebulizer converts liquids into an aerosol, and that aerosol can then be swept into the plasma to create the ions. Nebulizers work best w... | 3 | Analytical Chemistry |
In addition to the operations of the point group, the space group of the crystal structure contains translational symmetry operations. These include:
*Pure translations, which move a point along a vector
*Screw axes, which rotate a point around an axis while translating parallel to the axis.
*Glide planes, which reflec... | 3 | Analytical Chemistry |
Practical applications of the respiratory quotient can be found in severe cases of chronic obstructive pulmonary disease, in which patients spend a significant amount of energy on respiratory effort. By increasing the proportion of fats in the diet, the respiratory quotient is driven down, causing a relative decrease i... | 1 | Biochemistry |
Lipotropic compounds are those that help catalyse the breakdown of fat during metabolism in the body. A lipotropic nutrient promotes or encourages the export of fat from the liver. Lipotropics are necessary for maintenance of a healthy liver, and for burning the exported fat for additional energy. Without lipotropics, ... | 1 | Biochemistry |
A model put forward by Lee Kump, Alexander Pavlov and Michael Arthur in 2005 suggests that oceanic anoxic events may have been characterized by upwelling of water rich in highly toxic hydrogen sulfide gas, which was then released into the atmosphere. This phenomenon would probably have poisoned plants and animals and c... | 9 | Geochemistry |
Assuming a two state denaturation as stated above, one can derive the fundamental thermodynamic parameters namely, , and provided one has knowledge on the of the system under investigation.
The thermodynamic observables of denaturation can be described by the following equations:
where , and indicate the enthalpy,... | 7 | Physical Chemistry |
Minipreparation of plasmid DNA is a rapid, small-scale isolation of plasmid DNA from bacteria. Commonly used miniprep methods include alkaline lysis and spin-column based kits. It is based on the alkaline lysis method. The extracted plasmid DNA resulting from performing a miniprep is itself often called a "miniprep".
... | 1 | Biochemistry |
Proteins are biomolecules that are composed of amino acid subunits. Each amino acid has a side chain that gains or loses charge depending on the pH of the surrounding environment, as well as its own individual polar/nonpolar qualities. Charged regions can greatly contribute to how that protein interacts with other mole... | 1 | Biochemistry |
Feline leukemia virus and Feline immunodeficiency virus infections are treated with biologics, including the only immunomodulator currently licensed for sale in the United States, Lymphocyte T-Cell Immune Modulator (LTCI). | 1 | Biochemistry |
An old standing dynamic problem is how DNA "self-replication" takes place in living cells that should involve transient uncoiling of supercoiled DNA fibers. Although DNA consists of relatively rigid, very large elongated biopolymer molecules called fibers or chains (that are made of repeating nucleotide units of four b... | 4 | Stereochemistry |
Daily light integral (DLI) describes the number of photosynthetically active photons (individual particles of light in the 400-700 nm range) that are delivered to a specific area over a 24-hour period. This variable is particularly useful to describe the light environment of plants. | 5 | Photochemistry |
Some carbon removal techniques add alkalinity to the ocean and therefore immediately buffer pH changes which might help the organisms in the region that the extra alkalinity is added to. The two technologies that fall into this category are ocean alkalinity enhancement and electrochemical methods. Eventually, due to di... | 9 | Geochemistry |
TFD is itself composed of TBP and several subunits called TATA-binding protein Associated Factors (TBP-associated factors, or TAFs). In a test tube, only TBP is necessary for transcription at promoters that contain a TATA box. TAFs, however, add promoter selectivity, especially if there is no TATA box sequence for TBP ... | 1 | Biochemistry |
Several studies of diets supplemented with MFGM and its components, including gangliosides and sphingomyelin, have aimed to address measures of cognitive development in pediatric populations. In some of the studies, MFGM supplementation to infant formula was shown to narrow the gap in cognitive development between brea... | 1 | Biochemistry |
Aside from virtually all saturated organic compounds, most compounds of Si, Ge, and Sn are tetrahedral. Often tetrahedral molecules feature multiple bonding to the outer ligands, as in xenon tetroxide (XeO), the perchlorate ion (), the sulfate ion (), the phosphate ion (). Thiazyl trifluoride () is tetrahedral, featuri... | 4 | Stereochemistry |
In nature, carbon fixation is done by green plants using the enzyme RuBisCO as a part of the Calvin cycle. RuBisCO is a rather slow catalyst compared to the vast majority of other enzymes, incorporating only a few molecules of carbon dioxide into ribulose-1,5-bisphosphate per minute, but does so at atmospheric pressure... | 5 | Photochemistry |
* Coordinates in square brackets such as denote a direction vector (in real space).
* Coordinates in angle brackets or chevrons such as <100> denote a family of directions which are related by symmetry operations. In the cubic crystal system for example, or the negative of any of those directions.
* Miller indi... | 3 | Analytical Chemistry |
Loss of gene activity leads to a nutritional requirement (auxotrophy) not exhibited by the wildtype (prototrophy).
Amino acids:
*ala = alanine
*arg = arginine
*asn = asparagine
Some pathways produce metabolites that are precursors of more than one pathway. Hence, loss of one of these enzymes will lead to a requirement ... | 1 | Biochemistry |
Electrofusion welding employs fittings that are placed around the joint to be welded. Metal coils are implanted into the fittings, and electric current is run through the coils to generate heat and melt part of the pipes, forming a joint upon solidification. There are two possible fittings used in electrofusion welding... | 7 | Physical Chemistry |
Diphoterine is a decontamination solution used in first aid for the emergency treatment of chemical spills to the eyes and body. | 7 | Physical Chemistry |
Phosphorylation is the main post-translational modification predicted for FAM227B due to its predicted localization to the nucleus. There are many experimentally predicted phosphorylation sites, the most highly rated included in the conceptual translation. Glycosylation sites and SUMOylation sites were also predicted. | 1 | Biochemistry |
The forms of sulfur available in aquatic environments depends on whether it is a marine or freshwater environment. Freshwater environments are more varied and subject to a multitude of sulfur inputs and outputs, including atmospheric deposition, runoff, diagenesis of bedrock and the presence of microbial sulfate reduce... | 9 | Geochemistry |
A typical amphiphilic flexible surfactant can form aggregates through a self-assembly process that results of specific interactions between the molecules of the amphiphilic mesogen and those of the non-mesogenic solvent.
In aqueous media, the driving force of the aggregation is the "hydrophobic effect". The aggregates ... | 7 | Physical Chemistry |
The Federal Government of Canada defines brownfields as "abandoned, idle or underutilized commercial or industrial properties [typically located in urban areas] where past actions have caused environmental contamination, but which still have potential for redevelopment or other economic opportunities." | 2 | Environmental Chemistry |
The GLD-2 protein together with 136 proteins more, is involved in the molecular process of hematopoietic progenitor cell differentiation, in the human proteome. This is the process in which precursor cell type acquires the specialized features of a hematopoietic progenitor cell, a kind of cell types including myeloid p... | 1 | Biochemistry |
Superhydrophilicity refers to the phenomenon of excess hydrophilicity, or attraction to water; in superhydrophilic materials, the contact angle of water is equal to zero degrees. This effect was discovered in 1995 by the Research Institute of Toto Ltd. for titanium dioxide irradiated by sunlight. Under light irradiatio... | 7 | Physical Chemistry |
ρ: Actual particle density (g/cm)
ρ: Gas or sample matrix density (g/cm)
r: Least-squares coefficient of determination. The closer this value is to 1.0, the better the data fit to a hyperplane representing the relationship between the response variable and a set of covariate variables. A value equal to 1.0 indicates a... | 7 | Physical Chemistry |
This method is an acid heap leaching method like that of the copper method in that it utilises sulfuric acid instead of cyanide solution to dissolve the target minerals from crushed ore. The amount of sulfuric acid required is much higher than for copper ores, as high as 1,000 kg of acid per tonne of ore, but 500 kg is... | 8 | Metallurgy |
To stop the electron transfer chain completing, producing output signals, the input of a photon, , is used to produce a pump probe spectroscopy effect by promoting an electron in an electron transfer chain. The fall of the pump probe promoted electron produces an output that is quenched down an electron transfer chain.... | 5 | Photochemistry |
There are different enzymes to remove the glycans from the proteins or remove some part of the sugar chain.
* α2-3,6,8,9-Neuraminidase (from Arthrobacter ureafaciens): cleaves all non-reducing terminal branched and unbranched sialic acids.
* β1,4-Galactosidase (from Streptococcus pneumoniae): releases only β1,4-linked,... | 0 | Organic Chemistry |
Basaltic magma is the most abundant in iron, magnesium, and calcium but the lowest in silica, potassium, and sodium. The composition of silica within basaltic magma ranges from 45-55 weight percent (wt.%), or mass fraction of a species. It forms in temperatures ranging from approximately 1830 °F to 2200 °F. Basaltic ... | 9 | Geochemistry |
Enzymes and enzymatic complexes able to break down difficult-to-transform macromolecules such as cellulose, hemicelluloses, pectin and proteins. Solid state fermentation is well suited for the production of various enzymatic complexes composed of multiple enzymes. Enzymatic compounds generated by SSF find outlets in al... | 1 | Biochemistry |
Polymers are of great importance when considering protein adsorption in the biomedical arena. Polymers are composed of one or more types of "mers" bound together repeatedly, typically by directional covalent bonds. As the chain grows by the addition of mers, the chemical and physical properties of the material are dict... | 1 | Biochemistry |
Electroosmotic flow is caused by the Coulomb force induced by an electric field on net mobile electric charge in a solution. Because the chemical equilibrium between a solid surface and an electrolyte solution typically leads to the interface acquiring a net fixed electrical charge, a layer of mobile ions, known as an... | 7 | Physical Chemistry |
CDC Director Mandy Cohen serves concurrently/ex officio as ATSDR administrator and CDC director, heading the Office of the Administrator. Patrick N. Breysse, PhD. serves as director of NCEH/ATSDR, heading the Office of the Director. The ATSDR administrator/CDC director, who provides overall leadership of the agency, is... | 1 | Biochemistry |
Current researchers have developed gene transfer systems on the basis of conservative transposition which can integrate new DNA in both invertebrates and vertebrate genomes. Scientists alter the genetic sequence of a transposon in a laboratory setting, then insert this sequence into a vector which is then inserted into... | 1 | Biochemistry |
Hattori has made contributions to the field of earth sciences, utilizing trace element geochemistry and stable and radiogenic isotopes to understand the earth processes. During the early stages of her career, she focused on studying active volcanoes and associated hydrothermal activity. However, a tragic accident atop ... | 9 | Geochemistry |
The prostaglandin E (PGE) receptors are G protein-coupled receptors that bind and are activated by prostaglandin E. They are members of the prostaglandin receptors class of receptors and include the following Protein isoforms:
* Prostaglandin E receptor 1 (EP) -
* Prostaglandin E receptor 2 (EP) -
* Prostaglandin E r... | 1 | Biochemistry |
The avalanche occurs in a gaseous medium that can be ionised (such as air). The electric field and the mean free path of the electron must allow free electrons to acquire an energy level (velocity) that can cause impact ionisation. If the electric field is too small, then the electrons do not acquire enough energy. ... | 7 | Physical Chemistry |
Activity-regulated cytoskeleton-associated protein is a plasticity protein that in humans is encoded by the ARC gene. The gene is believed to derive from a retrotransposon. The protein is found in the neurons of tetrapods and other animals where it can form virus-like capsids that transport RNA between neurons.
ARC mRN... | 1 | Biochemistry |
In addition to the electrical potential difference, the presence of moisture is a driving factor in the ECM. If there is a sufficient film of moisture with condensation and even at low electrical voltage, the ECM can form a bridging structure between the contacts after just a few minutes.
In general, the process can be... | 7 | Physical Chemistry |
The Rehbinder effect in physics is the reduction in the hardness and ductility of a material, particularly metals, by a surfactant film. The effect is named for Soviet scientist , who discovered the effect in 1928.
A proposed explanation for this effect is the disruption of surface oxide films, and the reduction of sur... | 7 | Physical Chemistry |
PSII also relies on light to drive the formation of proton gradients in chloroplasts, however, PSII utilizes vectorial redox chemistry to achieve this goal. Rather than physically transporting protons through the protein, reactions requiring the binding of protons will occur on the extracellular side while reactions re... | 7 | Physical Chemistry |
The Descriptions of Plant Viruses (DPVs) were first published by the Association of Applied Biologists in 1970 as a series of leaflets, each one written by an expert describing a particular plant virus. In 1998 all of the 354 DPVs published in paper were scanned, and converted into an electronic format in a database an... | 1 | Biochemistry |
In thermodynamics, a temperature–entropy (T–s) diagram is a thermodynamic diagram used to visualize changes to temperature () and specific entropy () during a thermodynamic process or cycle as the graph of a curve. It is a useful and common tool, particularly because it helps to visualize the heat transfer during a pro... | 7 | Physical Chemistry |
Adenylate cyclase (EC 4.6.1.1, also commonly known as adenyl cyclase and adenylyl cyclase, abbreviated AC) is an enzyme with systematic name ATP diphosphate-lyase (cyclizing; 3′,5′-cyclic-AMP-forming). It catalyzes the following reaction:
:ATP = 3′,5′-cyclic AMP + diphosphate
It has key regulatory roles in essentially ... | 1 | Biochemistry |
The École Nationale Supérieure dÉlectrochimie et dÉlectrométallurgie de Grenoble, or ENSEEG, was one of the French Grandes écoles of engineering (engineering schools). It has been created in 1921 under the name Institut d’électrochimie et d’électrométallurgie (IEE) (Institute of Electrochemistry and Electrometallurgy)... | 8 | Metallurgy |
SPEARpesticides has been first developed for Central Germany and updated. SPEARpesticides was adapted and validated for streams and mesocosms worldwide and provides the first ecotoxicological approach to specifically determine the ecological effects of pesticides on aquatic invertebrate communities. Denmark, Finland, F... | 2 | Environmental Chemistry |
* Birch, Alan. Economic History of the British Iron and Steel Industry (Routledge, 2013).
* Burn, D. L. “Recent Trends in the History of the Steel Industry.” Economic History Review, 17#2 1947, pp. 95–102. [https://www.jstor.org/stable/2590552 online].
* Burn, Duncan. The Steel Industry, 1939–1959: A Study in Competiti... | 8 | Metallurgy |
Freezing is a phase transition where a liquid turns into a solid when its temperature is lowered below its freezing point. In accordance with the internationally established definition, freezing means the solidification phase change of a liquid or the liquid content of a substance, usually due to cooling.
For most subs... | 1 | Biochemistry |
Together with the benzyltriethylammonium salt, benzyltrimethylammonium hydroxide is a popular phase-transfer catalyst.
It is used in aldol condensation reactions and base-catalyzed dehydration reactions. It is also used as a base in Ando's Z-selective variant of Horner-Wadsworth-Emmons Olefination reactions.
Relative t... | 0 | Organic Chemistry |
The acylurea functional group is also found in some pharmaceutical drugs such as the anticonvulsants phenacemide, pheneturide, chlorphenacemide, and acetylpheneturide (which are phenylureides), and the sedatives acecarbromal, bromisoval, and carbromal (which are bromoureides). Others include apronal (apronalide), capur... | 0 | Organic Chemistry |
In reproducing, most plants inherit their plastids from only one parent. In general, angiosperms inherit plastids from the female gamete, where many gymnosperms inherit plastids from the male pollen. Algae also inherit plastids from just one parent. Thus the plastid DNA of the other parent is completely lost.
In normal... | 5 | Photochemistry |
The importance and versatility of depolarization within cells can be seen in the relationship between rod cells in the eye and their associated neurons. When rod cells are in the dark, they are depolarized. In the rod cells, this depolarization is maintained by ion channels that remain open due to the higher voltage of... | 7 | Physical Chemistry |
Different protecting groups on either the glycosyl donor or the glycosyl acceptor may affect the reactivity and yield of the glycosylation reaction. Typically, electron-withdrawing groups such as acetyl or benzoyl groups are found to decrease the reactivity of the donor/acceptor and are therefore termed "disarming" gr... | 0 | Organic Chemistry |
Arsenicals are chemical compounds that contain arsenic. In a military context, the term arsenical refer to toxic arsenic compounds that are used as chemical warfare agents. This include blister agents, blood agents and vomiting agents. Historically, they were used extensively as insecticides, especially lead arsenate. | 1 | Biochemistry |
Novec 649/1230 does not deplete ozone (ODP 0) and has a global warming potential of 1 (over 100 years), equivalent to that of carbon dioxide. The Globally Harmonized System of Classification and Labeling of Chemicals (GHS) classifies this chemical as H412 - Harmful to aquatic life with long lasting effects. Photolysis ... | 2 | Environmental Chemistry |
An important example of chemisorption is in heterogeneous catalysis which involves molecules reacting with each other via the formation of chemisorbed intermediates. After the chemisorbed species combine (by forming bonds with each other) the product desorbs from the surface. | 7 | Physical Chemistry |
In polymer chemistry and polymer physics, the Flory–Fox equation is a simple empirical formula that relates molecular weight to the glass transition temperature of a polymer system. The equation was first proposed in 1950 by Paul J. Flory and Thomas G. Fox while at Cornell University. Their work on the subject overtu... | 7 | Physical Chemistry |
The yeast mitochondrial code (translation table 3) is a genetic code used by the mitochondrial genome of yeasts, notably Saccharomyces cerevisiae, Candida glabrata, Hansenula saturnus, and Kluyveromyces thermotolerans. | 1 | Biochemistry |
A 4n electron electrocyclic ring opening reaction can be considered to have 2 components – the π-system and the breaking σ-bond. With respect to the π-system, the reaction is suprafacial. However, with a conrotatory mechanism, as shown in the figure above, the reaction is antarafacial with respect to the σ-bond. Con... | 7 | Physical Chemistry |
In this type of reaction, a metal atom in a compound or solution is replaced by an atom of another metal. For example, copper is deposited when zinc metal is placed in a copper(II) sulfate solution:
In the above reaction, zinc metal displaces the copper(II) ion from copper sulfate solution and thus liberates free coppe... | 9 | Geochemistry |
Light harvesting in photosynthesis employs both classical and quantum mechanical processes with an energy efficiency of almost 100 percent. For light to produce energy in classical processes, photons must reach reaction sites before their energy dissipates in less than one nanosecond. In photosynthetic processes, this ... | 5 | Photochemistry |
Catalytic chain transfer (CCT) is a process that can be incorporated into radical polymerization to obtain greater control over the resulting products. | 7 | Physical Chemistry |
The majority of organic compounds introduced on Earth by interstellar dust particles have helped to form complex molecules, thanks to their peculiar surface-catalytic activities. Studies of the C/C isotopic ratios of organic compounds in the Murchison meteorite suggest that the RNA component uracil and related molecule... | 9 | Geochemistry |
Huang was born in Putian, Fujian, China on December 15, 1921. He graduated from Fukien Christian University in 1943 with a bachelor's degree in chemistry. After earning his MS in 1949 from Lingnan University in Guangzhou, he entered Harvard University and received his Ph.D. in 1952. His graduate advisor was the organi... | 0 | Organic Chemistry |
Photochromic, thermochromic, solvatochromic and electrochromic characteristics of spiropyrans make them especially important in the technology area. Most of their applications are based on their photochromic properties.
Photochromic compounds based on spiropyrans, spirooxazines, and [2H]chromenes are being investigated... | 5 | Photochemistry |
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