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Global radiative equilibrium can be defined for an entire passive celestial system that does not supply its own energy, such as a planet.
Liou (2002, page 459) and other authors use the term global radiative equilibrium to refer to radiative exchange equilibrium globally between Earth and extraterrestrial space; such a... | 7 | Physical Chemistry |
Hypothermia continues to be a major limitation to swimming or diving in cold water. The reduction in finger dexterity due to pain or numbness decreases general safety and work capacity, which consequently increases the risk of other injuries.
Other factors predisposing to immersion hypothermia include dehydration, inad... | 1 | Biochemistry |
The program may run with fixed input data for the number of years determined by the user. This option can be used to predict future developments based on long-term average input values, e.g. rainfall, as it will be difficult to assess the future values of the input data year by year.
The program also offers the possibi... | 9 | Geochemistry |
Self-heating cans of military food rations developed during WWII used a thermite-like mixture of 1:1 iron(II,III) oxide and calcium silicide. Such mixture, when ignited, generates moderate amount of heat and no gaseous products. | 8 | Metallurgy |
Protective forms of chemical mimicry work to benefit the mimicking species by preventing harm. In most cases this achieved by acting as a deterrent to other organisms by mimicking the chemicals emitted by another species that has a mechanism to deter predators. This can be either Batesian Mimicry or Müllerian mimicry. | 1 | Biochemistry |
Metal smiths demonstrated increasing technical sophistication, producing both utilitarian and status-linked items. During the latter phase, Michoacán emerged as a technological hub, with metal artifacts also appearing at the adjacent zones of Guerrero and Jalisco.
Alloys became more prevalent during the second phase, ... | 8 | Metallurgy |
A key physical factor which distinguishes the LCST from other mixture behavior is that the LCST phase separation is driven by unfavorable entropy of mixing. Since mixing of the two phases is spontaneous below the LCST and not above, the Gibbs free energy change (ΔG) for the mixing of these two phases is negative below ... | 7 | Physical Chemistry |
In the most simplified quorum sensing systems, bacteria only need two components to make use of autoinducers. They need a way to produce a signal and a way to respond to that signal. These cellular processes are often tightly coordinated and involve changes in gene expression. The production of autoinducers generally i... | 1 | Biochemistry |
Desalting spin columns are widely available with various volumes and MWCO limits:
* [http://www.piercenet.com/cat/desalting-columns Thermo Scientific Pierce Products]
* [http://www.bio-rad.com/en-us/category/bio-spin-micro-bio-spin-size-exclusion-columns Bio-Rad Laboratories, Inc.]
* [https://www.cytivalifesciences.com... | 3 | Analytical Chemistry |
SPIDR (scaffold protein involved in DNA repair) regulates the stability or assembly of RAD51 and DMC1 on single-stranded DNA. RAD51 and DMC1 are recombinases that act during mammalian meiosis to mediate strand exchange during the repair of DNA double-strand breaks by homologous recombination. | 1 | Biochemistry |
Chlorination of organic isothiocyanates is also well established:
:RN=C=S + 2Cl → RN=CCl + SCl
Alkylisocyanates are chlorinated by phosphorus pentachloride:
:RN=C=O + PCl → RN=CCl + POCl
Cyanogen chloride also chlorinates to give the isocyanide dichloride:
:ClCN + Cl → ClN=CCl | 0 | Organic Chemistry |
Paramyxoviruses are a diverse family of non-segmented negative strand RNA viruses that include many highly pathogenic viruses affecting humans, animals, and birds. These include canine distemper virus (dogs), phocine distemper virus (seals), cetacean morbillivirus (dolphins and porpoises) Newcastle disease virus (birds... | 1 | Biochemistry |
In China, a number of incidents have occurred where state limits were exceeded by large amounts or where the wrong pesticide was used. In August 1994, a serious incident of pesticide poisoning of sweet potato crops occurred in Shandong province, China. Because local farmers were not fully educated in the use of insecti... | 2 | Environmental Chemistry |
An improvement on optical mapping, called "Nanocoding", has potential to boost throughput by trapping elongated DNA molecules in nanoconfinements. | 1 | Biochemistry |
SMA actuators are typically actuated electrically by Joule heating. If the SMA is used in an environment where the ambient temperature is uncontrolled, unintentional actuation by ambient heating may occur. | 8 | Metallurgy |
In South Africa, modafinil is Schedule V substance, which means that it is legal to use modafinil in South Africa, but only with a valid prescription from a licensed medical practitioner. | 4 | Stereochemistry |
Consistent with Coulomb's law, There is a very strong relationship between the energetic stabilization associated with a sigma hole interaction and the product of the electrostatic potentials associated with the sigma hole and lone pair sites. Therefore, factors that increase the electrostatic potential of the sigma ho... | 6 | Supramolecular Chemistry |
Purinergic signalling has an essential role at interactions between neurons and glia cells, allowing these to detect action potentials and modulate neuronal activity, contributing for intra and extracellular homeostasis regulation. Besides purinergic neurotransmitter, ATP acts as a trophic factor at cellular developmen... | 7 | Physical Chemistry |
Although the concept of molecular-weight markers has been retained, techniques of development have varied throughout the years. New inventions of molecular-weight markers are distributed in kits specific to the marker's type.
An early problem in the development of markers was achieving high resolution throughout the en... | 1 | Biochemistry |
Most VOCs in Earth's atmosphere are biogenic, largely emitted by plants.
Biogenic volatile organic compounds (BVOCs) encompass VOCs emitted by plants, animals, or microorganisms, and while extremely diverse, are most commonly terpenoids, alcohols, and carbonyls (methane and carbon monoxide are generally not considered)... | 0 | Organic Chemistry |
The word transcriptome is a portmanteau of the words transcript and genome. It appeared along with other neologisms formed using the suffixes -ome and -omics to denote all studies conducted on a genome-wide scale in the fields of life sciences and technology. As such, transcriptome and transcriptomics were one of the f... | 1 | Biochemistry |
Although shotgun sequencing can in theory be applied to a genome of any size, its direct application to the sequencing of large genomes (for instance, the human genome) was limited until the late 1990s, when technological advances made practical the handling of the vast quantities of complex data involved in the proces... | 1 | Biochemistry |
Reactive compatibilization is the process of modifying a mixed immiscible blend of polymers to arrest phase separation and allow for the formation of a stable, long-term continuous phase. It is done via the addition of a reactive polymer, miscible with one blend component and reactive towards functional groups on the s... | 7 | Physical Chemistry |
Organic molecules containing knots may fall into the categories of slipknots or pseudo-knots. They are not considered mathematical knots because they are not a closed curve, but rather a knot that exists within an otherwise linear chain, with termini at each end. Knotted proteins are thought to form molecular knots dur... | 6 | Supramolecular Chemistry |
* Promoter - commonly used inducible promoters are promoters derived from lac operon and the T7 promoter. Other strong promoters used include Trp promoter and Tac-Promoter, which are a hybrid of both the Trp and Lac Operon promoters.
* Ribosome binding site (RBS) - follows the promoter, and promotes efficient translat... | 1 | Biochemistry |
Zinc metal is inserted into the carbon-halogen bond of the α-haloester by oxidative addition 1. This compound dimerizes and rearranges to form two zinc enolates 2. The oxygen on an aldehyde or ketone coordinates to the zinc to form the six-member chair like transition state 3. A rearrangement occurs in which zinc swit... | 0 | Organic Chemistry |
kainic acid receptor - kallidin - kappa opioid receptor - kappa-chain immunoglobulin - karyoplasm - karyotype - kelvin - keratin - kinase - kinesin - kinetic energy - kinetic exclusion assay - kinetics - knock-out mouse - Krebs cycle | 1 | Biochemistry |
The surface-area-to-volume ratio has physical dimension inverse length (L) and is therefore expressed in units of inverse metre (m) or its prefixed unit multiples and submultiples. As an example, a cube with sides of length 1 cm will have a surface area of 6 cm and a volume of 1 cm. The surface to volume ratio for thi... | 7 | Physical Chemistry |
The discovery of mineral acids such as nitric acid is generally believed to go back to 13th-century European alchemy. The conventional view is that nitric acid was first described in pseudo-Gebers De inventione veritatis' ("On the Discovery of Truth", after ).
However, according to Eric John Holmyard and Ahmad Y. al-Ha... | 3 | Analytical Chemistry |
In nature, the incorporation of a deoxyribonucleoside triphosphate (dNTP) into a growing DNA strand involves the formation of a covalent bond and the release of pyrophosphate and a positively charged hydrogen ion. A dNTP will only be incorporated if it is complementary to the leading unpaired template nucleotide. Ion s... | 1 | Biochemistry |
* Biochemistry of phenolic compounds, by J. B. Harborne, 1964, Academic Press ([https://books.google.com/books?id=_-lqAAAAMAAJ Google Books])
* Plant phenolics, by Pascal Ribéreau-Gayon, 1972, Oliver and Boyd Editions ([https://books.google.com/books?id=EHzwAAAAMAAJ Google Books], , )
* The Biochemistry of plant phenol... | 0 | Organic Chemistry |
These elements are bound by specific uncharged tRNAs and modulate the expression of corresponding aminoacyl-tRNA synthetase operons. High levels of uncharged tRNA promote the anti-terminator sequence leading to increased concentrations of charged tRNA. These are considered by some to be a separate family of riboswitche... | 1 | Biochemistry |
A consensus site is a term in molecular biology that refers to a site on a protein that is often modified in a particular way. Modifications may be N- or O- linked glycosylation, phosphorylation, tyrosine sulfation or other. | 1 | Biochemistry |
In organic chemistry, a nitrate ester is an organic functional group with the formula , where R stands for any organyl group. They are the esters of nitric acid and alcohols. A well-known example is nitroglycerin, which is not a nitro compound, despite its name. | 0 | Organic Chemistry |
One of the highest, at least in Western Europe, is in Loos-en-Gohelle in the former mining area of Pas-de-Calais, France. It comprises a range of five cones, of which two reach , surpassing the highest peak in Flanders, Mont Cassel. One of the regions of Europe most "littered" with (mountainous) spoil heaps is the Donb... | 8 | Metallurgy |
An oxyhydrogen torch (also known as hydrogen torch) is an oxy-gas torch that burns hydrogen (the fuel) with oxygen (the oxidizer). It is used for cutting and welding metals, glasses, and thermoplastics.
Due to competition from arc welding and other oxy-fuel torches such as the acetylene-fueled cutting torch, the oxyhyd... | 7 | Physical Chemistry |
Gene symbols generally are italicised, with only the first letter in uppercase and the remaining letters in lowercase (Shh). Italics are not required on web pages. Protein designations are the same as the gene symbol, but are not italicised and all are upper case (SHH). | 1 | Biochemistry |
Physical chemistry is the study of macroscopic and microscopic phenomena in chemical systems in terms of the principles, practices, and concepts of physics such as motion, energy, force, time, thermodynamics, quantum chemistry, statistical mechanics, analytical dynamics and chemical equilibria.
Physical chemistry, in c... | 7 | Physical Chemistry |
The attractive forces between polymer chains play a large part in determining the polymer's properties. Because polymer chains are so long, they have many such interchain interactions per molecule, amplifying the effect of these interactions on the polymer properties in comparison to attractions between conventional mo... | 7 | Physical Chemistry |
Static light scattering assumes that each detected photon has only been scattered exactly once. Therefore, analysis according to the calculations stated above will only be correct if the sample has been diluted sufficiently to ensure that photons are not scattered multiple times by the sample before being detected. Acc... | 7 | Physical Chemistry |
Signaling action in neurons by sigma-2 receptors and their associated ligands results in modulation of action potential firing by regulation of calcium and potassium channels. They also are involved in synaptic vesicular release and modulation of dopamine, serotonin, and glutamate, with activation and increase of the d... | 1 | Biochemistry |
For efficient ridged mirrors, both estimates above should predict high reflectivity. This implies reduction of both, width, of the ridges and the period, . The width of the ridges cannot be smaller than the size of an atom; this sets the limit of performance of the ridged mirrors. | 7 | Physical Chemistry |
The synthesis of Pd-NHC complexes follows the methods used for the synthesis of transition metal NHC complexes. The synthesis of Pd-NHC complexes can also be achieved through substitution of a labile ligand L in a Pd-L complex. Labile ligands typically include cyclooctadiene, dibenzylideneacetone, bridging halides, or... | 0 | Organic Chemistry |
Rayleigh scattering is defined by a mathematical formula that requires the light-scattering particles to be far smaller than the wavelength of the light. For a dispersion of particles to qualify for the Rayleigh formula, the particle sizes need to be below roughly 40 nanometres (for visible light), and the particles ma... | 7 | Physical Chemistry |
For the pinhole configuration the width of the beam (which we aim to minimise) is largely given by geometrical optics. The size of the beam at the sample plane is given by the lines connecting the skimmer edges with the pinhole edges. When the Fresnel number is very small (), the beam width is also affected by Fraunho... | 7 | Physical Chemistry |
Co-translational and post-translational covalent modifications enable proteins to develop higher levels of complexity in cellular function, further adding diversity to the proteome. The addition of myristoyl-CoA to a protein can occur during protein translation or after. During co-translational addition of the myristoy... | 1 | Biochemistry |
A glycinergic agent (or drug) is a chemical which functions to directly modulate the glycine system in the body or brain. Examples include glycine receptor agonists, glycine receptor antagonists, and glycine reuptake inhibitors. | 1 | Biochemistry |
Deoxidization is a method used in metallurgy to remove the oxygen content during steel manufacturing. In contrast, antioxidants are used for stabilization, such as in the storage of food. Deoxidation is important in the steelmaking process as oxygen is often detrimental to the quality of steel produced. Deoxidizatio... | 8 | Metallurgy |
The re-evaluation of single enantiomers not without problems. The chiral switches of fluoxetine and fenfluramine are classical examples. The development of (R )-fluoxetine was terminated after patients developed abnormal heart rhythms. The chiral switch of fenfluramine, dexfenfluramine was withdrawn from world marker ... | 4 | Stereochemistry |
For plants to absorb nitrogen from urea it must first be broken down:
Urease is a naturally occurring enzyme that catalyzes the hydrolysis of urea to unstable carbamic acid. Rapid decomposition of carbamic acid occurs without enzyme catalysis to form ammonia and carbon dioxide. The ammonia will likely escape to the at... | 9 | Geochemistry |
Several compounds are known to promote the opening or activation of specific ion channels. These are classified by the channel on which they act:
*Calcium channel openers, such as Bay K8644
*Chloride channel openers, such as phenanthroline
*Potassium channel openers, such as minoxidil
*Sodium channel openers, such as D... | 1 | Biochemistry |
In the 1600s, the Moon was divided into two terranes, terra and maria. The terra terrane was thought to be landmass, and the maria terrane was thought to be the Moon's ocean, although this is now known to be false. The maria terrane is lower in elevation and younger in age than the terra terrane, and was formed by la... | 9 | Geochemistry |
A melanomorph is a substance related to the pigment melanin. Melanomorphs originate from the aromatic amino acids tyrosine, tryptophan, and phenylalanine. They tend to absorb ultraviolet-B light, with peaks around 280 nanometers. See also Beer's Law. | 1 | Biochemistry |
Following excitation, the loosened electron of P680* is taken up by the primary electron acceptor, a pheophytin molecule located within photosystem II near P680. During this transfer, P680* is ionized and oxidized, producing cationic P680. | 5 | Photochemistry |
In molecular biology, a hybridization probe (HP) is a fragment of DNA or RNA, usually 15–10000 nucleotides long, which can be radioactively or fluorescently labeled. HPs can be used to detect the presence of nucleotide sequences in analyzed RNA or DNA that are complementary to the sequence in the probe. The labeled pr... | 1 | Biochemistry |
SRAS (spatially resolved acoustic spectroscopy) a non-destructive acoustic microscopy microstructural-crystallographic characterization technique commonly used in the study of crystalline or polycrystalline materials. The technique can provide information about the structure and crystallographic orientation of the mate... | 7 | Physical Chemistry |
Other dyes used in connection with Van Gieson staining include:
* Alcian blue
* Amido black 10B
* Verhoeff's stain | 1 | Biochemistry |
The three-dimensional isotropic and non-relativistic uniform Fermi gas case is known as the Fermi sphere.
A three-dimensional infinite square well, (i.e. a cubical box that has a side length L) has the potential energy
The states are now labelled by three quantum numbers n, n, and n. The single particle energies are
wh... | 7 | Physical Chemistry |
Primary alkyl halides react with aqueous NaOH or KOH to alcohols in nucleophilic aliphatic substitution. (Secondary and especially tertiary alkyl halides will give the elimination (alkene) product instead). Grignard reagents react with carbonyl groups to secondary and tertiary alcohols. Related reactions are the Barbie... | 0 | Organic Chemistry |
Multilocus sequence typing (MLST) is a technique in molecular biology for the typing of multiple loci, using DNA sequences of internal fragments of multiple housekeeping genes to characterize isolates of microbial species.
The first MLST scheme to be developed was for Neisseria meningitidis, the causative agent of meni... | 1 | Biochemistry |
He is known for the so-called Zinin reaction or Zinin reduction, in which nitro aromates like nitrobenzene are converted to amines by reduction with ammonium sulfides.
In 1842 Zinin played an important role in identifying aniline. | 0 | Organic Chemistry |
Hammond was born on April 4, 1833, in Grafton, Massachusetts, to Josiah and Anna Warren. One of his siblings, William Henry (1841–1908), followed him to Maine. He worked in Portland until his death, a few months after George, at the age of 67. His body was returned to the family's hometown of Grafton for interment.
He ... | 8 | Metallurgy |
Historically, sediments with the highest organic carbon contents were frequently found in areas with high surface water productivity or those with low bottom-water oxygen concentrations. 90% of organic carbon burial occurs in deposits of deltas and continental shelves and upper slopes; this is due partly to short expo... | 9 | Geochemistry |
Chloroplasts have their own ribosomes, which they use to synthesize a small fraction of their proteins. Chloroplast ribosomes are about two-thirds the size of cytoplasmic ribosomes (around 17 nm vs 25 nm). They take mRNAs transcribed from the chloroplast DNA and translate them into protein. While similar to bacterial r... | 5 | Photochemistry |
In the experiment, proflavin-induced mutations of the T4 bacteriophage gene, rIIB, were isolated. Proflavin causes mutations by inserting itself between DNA bases, typically resulting in insertion or deletion of a single base pair.
Through the use of proflavin, the experimenters were able to insert or delete base pairs... | 1 | Biochemistry |
A clinical application of DCS is for use in diagnosis of cancers. An example of this is measuring red blood cell flow in breast tumors. In this experiment, both healthy patients and patients with breast tumors were recruited. Researchers scanned the tumor with a hand-held optical probe with 4 sources and detectors 2.5 ... | 7 | Physical Chemistry |
Particulate inorganic carbon (PIC) can be contrasted with dissolved inorganic carbon (DIC), the other form of inorganic carbon found in the ocean. These distinctions are important in chemical oceanography. Particulate inorganic carbon is sometimes called suspended inorganic carbon. In operational terms, it is defined a... | 9 | Geochemistry |
Moshers acid, via its acid chloride derivative, reacts readily with alcohols and amines to give esters and amides, respectively. The lack of an alpha-proton on the acid prevents loss of stereochemical fidelity under the reaction conditions. Thus, using an enantiomerically pure Moshers acid allows for determination of t... | 4 | Stereochemistry |
DNA testing has been used to establish the right of succession to British titles.
Cases:
* Baron Moynihan
* Pringle baronets | 1 | Biochemistry |
Lexitropsins are members of a family of semi-synthetic DNA-binding ligands. They are structural analogs of the natural antibiotics netropsin and distamycin. Antibiotics of this group can bind in the minor groove of DNA with different sequence-selectivity. Lexitropsins form a complexes with DNA with stoichiometry 1:1 a... | 1 | Biochemistry |
For the flux density received from a remote unresolvable "point source", the measuring instrument, usually telescopic, though not able to resolve any detail of the source itself, must be able to optically resolve enough details of the sky around the point source, so as to record radiation coming from it only, uncontami... | 7 | Physical Chemistry |
In Crigler Najjar disease, there is an inherited deficiency of glucuronyl transferase resulting in high concentrations of unconjugated bilirubin appear in the plasma. Furthermore, those affected may develop kernicterus (deposits of pigment in the brain) that can cause nerve degeneration. | 1 | Biochemistry |
In chemistry, a radical, also known as a free radical, is an atom, molecule, or ion that has at least one unpaired valence electron.
With some exceptions, these unpaired electrons make radicals highly chemically reactive. Many radicals spontaneously dimerize. Most organic radicals have short lifetimes.
A notable exampl... | 2 | Environmental Chemistry |
Fatty acids, stored as triglycerides in an organism, are a concentrated source of energy because they contain little oxygen and are anhydrous. The energy yield from a gram of fatty acids is approximately 9 kcal (37 kJ), much higher than the 4 kcal (17 kJ) for carbohydrates. Since the hydrocarbon portion of fatty acids ... | 1 | Biochemistry |
As fusion time begins, there is an incubation period where no strength develops. Once enough time has passed for the molten material to begin solidifying, the joint strength begins to develop before plateauing at the maximum strength. If power is applied after full joint strength is achieved, the strength will start to... | 7 | Physical Chemistry |
Particle-induced X-ray emission or proton-induced X-ray emission (PIXE) is a technique used for determining the elemental composition of a material or a sample. When a material is exposed to an ion beam, atomic interactions occur that give off EM radiation of wavelengths in the x-ray part of the electromagnetic spectru... | 7 | Physical Chemistry |
GPCRs downstream signals have been shown to possibly interact with integrin signals, such as FAK. Integrin signaling will phosphorylate FAK, which can then decrease GPCR G activity. | 1 | Biochemistry |
The first Congress of Biochemistry was held in 1949 in Cambridge, UK, and was inspired by German-born British biochemist Sir Hans Adolf Krebs as a means of bringing together biochemists who had been separated by World War II. At the time, biochemistry was blossoming as a discipline and was seeking its own recognition ... | 1 | Biochemistry |
The Broken Hill Associated Smelters Proprietary Limited (“BHAS”) lead smelter, now owned by Nyrstar NV, has been the world’s largest lead smelter. Its staff was responsible for many significant technical developments in the lead smelting industry, including the updraft sinter plant and continuous lead refining.
Until 1... | 8 | Metallurgy |
Microarrays are not limited to DNA analysis; protein microarrays, antibody microarray, chemical compound microarray can also be produced using biochips. Randox Laboratories Ltd. launched Evidence, the first protein Biochip Array Technology analyzer in 2003. In protein Biochip Array Technology, the biochip replaces th... | 1 | Biochemistry |
The first medical application of electroporation was used for introducing poorly permeant anticancer drugs into tumor nodules. Soon also gene electrotransfer became of special interest because of its low cost, easiness of realization and safety. Namely, viral vectors can have serious limitations in terms of immunogenic... | 1 | Biochemistry |
ISO standard 1133-1 governs the procedure for measurement of the melt flow rate. The procedure for determining MFI is as follows:
# A small amount of the polymer sample (around 4 to 5 grams) is taken in the specially designed MFI apparatus. A die with an opening of typically around 2 mm diameter is inserted into the ap... | 7 | Physical Chemistry |
Some assembly methods also make use of type IIs restriction endonucleases. These differ from other type II endonucleases as they cut several base pairs away from the recognition site. As a result, the overhang sequence can be modified to contain the desired sequence. This provides Type IIs assembly methods with two adv... | 1 | Biochemistry |
Novec 1230 is used as gaseous fire suppression agent in scenarios where water-based fire suppression (for example, from a fire sprinkler) would be impractical or where it could damage expensive equipment or property, such as museums, server rooms, banks, clean rooms and hospitals. It functions by rapidly removing heat ... | 2 | Environmental Chemistry |
A cumulative equilibrium constant, denoted by is related to the product of stepwise constants, denoted by For a dibasic acid the relationship between stepwise and overall constants is as follows
Note that in the context of metal-ligand complex formation, the equilibrium constants for the formation of metal complexes ... | 7 | Physical Chemistry |
The TCF7L2 gene, encoding the TCF7L2 protein, is located on chromosome 10q25.2-q25.3. The gene contains 19 exons. Of the 19 exons, 5 are alternative. The TCF7L2 protein contains 619 amino acids and its molecular mass is 67919 Da. TCF7L2's secondary structure is a helix-turn-helix structure. | 1 | Biochemistry |
Polanyi's theory has historical significance whose work has been used a foundation for other models, such as the theory of volume filling micropores (TVFM) and the Dubinin–Radushkevich theory.
Other research have been performed loosely involving the potential theory of Polanyi such as the capillary condensation phenome... | 7 | Physical Chemistry |
After oral administration, peak serum concentration is reached after 12 hours, and up to 99% of the drug is bound to plasma proteins. The majority of ibuprofen is metabolized and eliminated within 24 hours in the urine; however, 1% of the unchanged drug is removed through biliary excretion. | 4 | Stereochemistry |
Starting with the work of Carl Woese from 1977, genomics studies have placed the last universal common ancestor (LUCA) of all modern life-forms between Bacteria and a clade formed by Archaea and Eukaryota in the phylogenetic tree of life. It lived over 4 Gya. A minority of studies have placed the LUCA in Bacteria, prop... | 9 | Geochemistry |
In biology and biochemistry, the active site is the region of an enzyme where substrate molecules bind and undergo a chemical reaction. The active site consists of amino acid residues that form temporary bonds with the substrate, the binding site, and residues that catalyse a reaction of that substrate, the catalytic s... | 1 | Biochemistry |
In chemistry an eclipsed conformation is a conformation in which two substituents X and Y on adjacent atoms A, B are in closest proximity, implying that the torsion angle X–A–B–Y is 0°. Such a conformation can exist in any open chain, single chemical bond connecting two sp-hybridised atoms, and it is normally a conform... | 4 | Stereochemistry |
Material may be separated by means of air elutriation, which employs an apparatus with a vertical tube through which fluid is passed at a controlled velocity. When the particles are introduced, often through a side tube, the smaller particles are carried over in the fluid stream while the large particles settle against... | 7 | Physical Chemistry |
*Honor by the Sudanese Ambassador / Ahmed alsadeeq Abdulhai – Sudan Ambassador in UAE – On celebrations of Sudan's 56th Independence Day.2012
*Honor from Sudanese Consulate in Dubai and Sudanese Club On celebrations of Sudan's 56th Independence Day- Sudanese Club in Dubai.2012
*Honor from the higher Council for the Sud... | 7 | Physical Chemistry |
The method avoids DNA cloning (with the exception of NAPPA) and can quickly convert genetic information into functional proteins by using PCR DNA. The reduced steps in production and the ability to miniaturize the system saves on reagent consumption and cuts production costs. | 1 | Biochemistry |
Carbon dioxide, a key reactant in photosynthesis, is present in the atmosphere at a concentration of about 400 ppm. Most plants require the stomata to be open during daytime. The air spaces in the leaf are saturated with water vapour, which exits the leaf through the stomata in a process known as transpiration. Therefo... | 5 | Photochemistry |
An acoustic slowness surface can be determined for each pixel by propagating the acoustic wave in several directions. Having measured the SAW velocity in multiple directions the challenge is then to convert this information into the measurement of crystallographic orientation. The direct calculation of the orientation ... | 7 | Physical Chemistry |
Early work in the development of liquid-liquid separation techniques was undertaken by Cornish et al. with a process called "systematic fractional distribution" as well as Randall and Longtin, however, the central figure is certainly Lyman C. Craig. Lyman Craigs development of countercurrent distribution began with stu... | 3 | Analytical Chemistry |
Microcystinase is a protease that selectively degrades Microcystin, an extremely potent cyanotoxin that results in marine pollution and human and animal food chain poisoning. The enzyme is naturally produced by a number of bacteria isolated in Japan and New Zealand. As of 2012, the chemical structure of this enzyme ha... | 1 | Biochemistry |
The instrumentation needed in order to conduct the data acquisition include a multimode optical fiber, single-mode or few-mode fibers, photon-counting avalanche photodiodes (APDs), multi-tau correlator board, and a computer.
The first step of data acquisition is probing the tissue with multimode optical fibers that del... | 7 | Physical Chemistry |
The word ester was coined in 1848 by a German chemist Leopold Gmelin, probably as a contraction of the German , "acetic ether". | 0 | Organic Chemistry |
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