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The Salvinia effect defines surfaces which are able to permanently keep relatively thick air layers as a result of their hydrophobic chemistry, in combination with a complex architecture in nano- and microscopic dimensions.
This phenomenon was discovered during a systematic research on aquatic plants and animals by Wi... | 7 | Physical Chemistry |
Anhydrous aluminium chloride is a powerful Lewis acid, capable of forming Lewis acid-base adducts with even weak Lewis bases such as benzophenone and mesitylene. It forms tetrachloroaluminate () in the presence of chloride ions.
Aluminium chloride reacts with calcium and magnesium hydrides in tetrahydrofuran forming te... | 0 | Organic Chemistry |
The surface of any liquid is an interface between that liquid and some other medium. The top surface of a pond, for example, is an interface between the pond water and the air. Surface tension, then, is not a property of the liquid alone, but a property of the liquid's interface with another medium. If a liquid is in a... | 6 | Supramolecular Chemistry |
A similar-looking kind of damage is called false brinelling and is caused by fretting wear. Fretting wear occurs when localized wear-marks develop in evenly spaced patterns, with raised or unworn portions in between, like frets on a guitar. False brinelling occurs in two types: stationary and by precession.
Stationary... | 8 | Metallurgy |
The goal of combining fluorescence and nucleic acids has been to provide a non-isotopic tag that is detectable to study DNA or RNA. This type of labeling allows scientists to study DNA or RNA in their structure, function, or formation with other nucleic acids. The first base modification for fluorescent labeling occurr... | 1 | Biochemistry |
Over 90% of the dry weight of hair comprises proteins called keratins, which have a high disulfide content, from the amino acid cysteine. The robustness conferred in part by disulfide linkages is illustrated by the recovery of virtually intact hair from ancient Egyptian tombs. Feathers have similar keratins and are ext... | 0 | Organic Chemistry |
Two salt metathesis reactions are popular for laboratory scale reactions. In the Kolbe nitrile synthesis, alkyl halides undergo nucleophilic aliphatic substitution with alkali metal cyanides. Aryl nitriles are prepared in the Rosenmund-von Braun synthesis.
In general, metal cyanides combine with alkyl halides to give... | 0 | Organic Chemistry |
Gestonorone caproate has been available widely in Europe, including in the United Kingdom, and has also been marketed in Japan, China, Mexico, and certain other countries. However, it has been discontinued in most countries and its availability is more limited today; it appears to remain marketed only in the Czech Repu... | 4 | Stereochemistry |
In double knockout STAT2 mice, an increased proliferation of M1, M2, and M1/M2 coexpressing macrophages during influenza-bacterial super-infection is observed. The bacterial clearance was also impaired by neutralization of IFN-γ (M1) and Arginase-1 (M2) what suggests that pulmonary macrophages expressing a mixed M1/M2... | 1 | Biochemistry |
Tests for antibiotic effectiveness against E. coli, A. fecalis, B. subtilis, S. aureus, and P. aeruginosa were negative. Also, no inhibitory action was shown against A. niger, A. flavis, P. crustosum, F. graminearum, F. moniliforme, Alternara sp., and Cladosporium sp. However, some insecticidal activity has been shown... | 0 | Organic Chemistry |
Carbon dioxide () from air and bicarbonate () or carbonate () anions dissolved in water react with the calcium hydroxide (, portlandite) produced by Portland cement hydration in concrete to form calcium carbonate () while releasing a water molecule in the following reaction:
Exception made of the water molecule, the ... | 8 | Metallurgy |
The NURF complex in Drosophila contains four subunits: NURF301, NURF140, NURF55, and NURF38. NURF140 is an ISWI ATPase, distinguishable by its HAND, SANT, and SLIDE domains (SANT-like but with several insertions). The NURF complex in Homo sapiens has three subunits, BPTF, SNF2L, and pRBAP46/48, homologous to NURF301, N... | 1 | Biochemistry |
ppGpp inhibits IF2-mediated fMet-Phe initiation dipeptide formation, probably by interfering with 30S and 50S subunit interactions. E. coli accumulates more ppGpp than pppGpp during amino acid starvation, and ppGpp has about 8-fold greater efficiency than that of pppGpp. While B. subtilis accumulates more pppGpp than p... | 1 | Biochemistry |
He left the semiconductor industry in 1972, and began a new career as an entrepreneur in data security and cryptography. In 1972, he founded Atalla Technovation, later called Atalla Corporation, which dealt with safety problems of banking and financial institutions. | 7 | Physical Chemistry |
After escaping the promoter and shedding most of the transcription factors for initiation, the polymerase acquires new factors for the next phase of transcription: elongation. Transcription elongation is a processive process. Double stranded DNA that enters from the front of the enzyme is unzipped to avail the template... | 1 | Biochemistry |
Earlier converters, with a false bottom that can be detached and repaired, are still in use. Modern converters have a fixed bottom with plugs for argon purging. The energy optimization furnace (EOF) is a BOF variant associated with a scrap preheater where the sensible heat in the off-gas is used for preheating scrap, l... | 8 | Metallurgy |
In a solar photoelectrochemical process, hydrogen can be produced by electrolysis. To use sunlight in this process, a photoelectrochemical cell can be used, where one photosensitized electrode converts light into an electric current that is then used for water splitting. One such type of cell is the dye-sensitized sola... | 5 | Photochemistry |
Upregulation refers to the increase in the number of receptor sites on the membrane. Estrogen and FSH upregulate LHCGR sites in preparation for ovulation. After ovulation, the luteinized ovary maintains LHCGR s that allow activation in case there is an implantation. Upregulation in males requires gene transcription to... | 1 | Biochemistry |
The majority of transition metal dioxides (MO) have the rutile structure, seen to the right. Materials of this stoichiometry exist for Ti, Cr, V and Mn in the first row transition metal and for Zr to Pd in the second. The rutile structure is generated by filling half of the octahedral sites with cations of the hcp oxyg... | 7 | Physical Chemistry |
In the hybridization-ligation assay a template probe replaces the capture probe in the sandwich assay for immobilization to the solid support. The template probe is fully complementary to the oligonucleotide analyte and is intended to serve as a substrate for T4 DNA ligase-mediated ligation. The template probe has in ... | 1 | Biochemistry |
The mitochondrial permeability transition pore (mPTP or MPTP; also referred to as PTP, mTP or MTP) is a protein that is formed in the inner membrane of the mitochondria under certain pathological conditions such as traumatic brain injury and stroke. Opening allows increase in the permeability of the mitochondrial memb... | 1 | Biochemistry |
Photocatalyst radical generation species allow for the degradation of organic pollutants into non-toxic compounds at a high efficiency. Use of CuO nanosheets to breakdown azo bonds in food dyes is one such example, with 96.99% degradation after only 6 minutes. Degradation of organic matter is a highly applicable proper... | 5 | Photochemistry |
Substitutions can occur on the level of both the DNA and RNA. RNA editing-dependent amino acid substitutions can produce missense mRNA's of which occur through hydrolytic deaminase reactions. Two of the most prevalent deaminase reactions occur through the Apolipoprotein B mRNA editing enzyme (APOBEC) and the adenosine ... | 1 | Biochemistry |
Alclad is a corrosion-resistant aluminium sheet formed from high-purity aluminium surface layers metallurgically bonded (rolled onto) to high-strength aluminium alloy core material. It has a melting point of about . Alclad is a trademark of Alcoa but the term is also used generically.
Since the late 1920s, Alclad has b... | 8 | Metallurgy |
Overdoses of eszopiclone up to 90 times the recommended dose have been reported in which the patient fully recovered. Fatalities have been reported only in cases in which eszopiclone was combined with other drugs or alcohol. Overdose may be successfully treated with flumazenil, a GABA receptor antagonist used also for ... | 4 | Stereochemistry |
Particulate matter (PM), particularly PM2.5, was found to be harmful to aquatic invertebrates. These aquatic invertebrates include fish, crustaceans, and Mollusca. In a study by Han et al, the effects of PM<2.5 micrometers on life history traits and oxidative stress were observed in Tigriopus japonicus. Exposure to par... | 2 | Environmental Chemistry |
Solar energy conversion has the potential for many positive social impacts, especially in rural areas that did not previously have grid-based energy access. In many off-grid areas, the solar-electric conversion is the fastest growing form of energy procurement. This is especially true at latitudes within 45° north or s... | 7 | Physical Chemistry |
Diffusion hardening is a process used in manufacturing that increases the hardness of steels. In diffusion hardening, diffusion occurs between a steel with a low carbon content and a carbon-rich environment to increase the carbon content of the steel and ultimately harden the workpiece. Diffusion only happens through ... | 8 | Metallurgy |
The major steps in the Sulfo-TK pathway are:
* isomerization of sulfoquinovose to sulfofructose (catalyzed by sulfoquinovose isomerase);
* transketol reaction of sulfofructose to release erythrose (catalyzed by sulfofructose transketolase, a thiamine diphosphate dependent enzyme), and transfer of the C2-moiety to glyce... | 1 | Biochemistry |
Positive-sense (5′-to-3′) viral RNA signifies that a particular viral RNA sequence may be directly translated into viral proteins (e.g., those needed for viral replication). Therefore, in positive-sense RNA viruses, the viral RNA genome can be considered viral mRNA, and can be immediately translated by the host cell. U... | 1 | Biochemistry |
Geneticist Dean Hamer has suggested that a particular allele of the SLC18A2 gene correlates with spirituality using data from a smoking survey, which included questions intended to measure "self-transcendence". Hamer performed the spirituality study on the side, independently of the National Cancer Institute smoking st... | 1 | Biochemistry |
Loss of SFRP1 protein expression is associated with poor overall survival (OS) in patients with early breast cancer (pT1 tumours); this indicates that SFRP1 may be a putative tumor suppressor gene. SFRP1 methylation has been shown to be an independent risk factor for OS. Veeck and colleagues demonstrate, via Kaplan-Me... | 1 | Biochemistry |
The main improvements to immunofluorescence lie in the development of fluorophores and fluorescent microscopes. Fluorophores can be structurally modified to improve brightness and photostability, while preserving spectral properties and cell permeability.
Super-resolution fluorescence microscopy methods can produce ima... | 1 | Biochemistry |
In vivo gene electrotransfer was first described in 1991 and today there are many preclinical studies of gene electrotransfer. The method is used to deliver large variety of therapeutic genes for potential treatment of several diseases, such as: disorders in immune system, tumors, metabolic disorders, monogenetic disea... | 1 | Biochemistry |
In microorganisms and plants TPP results from coupling of pyrimidine fragment HMP-PP with thiazole fragment HET-P to give thiamine monophosphate, followed by conversion to the pyrophosphate.
Biogenesis of HMP-P and HET-P vary with types of organism. | 1 | Biochemistry |
In immunology, a conformational epitope is a sequence of sub-units (usually amino acids) composing an antigen that come in direct contact with a receptor of the immune system.
An antigen is any substance that the immune system can recognize as foreign. Antigens are usually proteins that are too large to bind as a whole... | 1 | Biochemistry |
Stereoisomerism about double bonds arises because rotation about the double bond is restricted, keeping the substituents fixed relative to each other. If the two substituents on at least one end of a double bond are the same, then there is no stereoisomer and the double bond is not a stereocenter, e.g. propene, CHCH=CH... | 4 | Stereochemistry |
J.W. Gibbs developed the thermodynamic theory of capillarity based
on the idea of surfaces of discontinuity. Gibbs considered the case of a sharp mathematical surface being placed somewhere within the microscopically fuzzy physical interface that exists between two homogeneous substances. Realizing that the exact choic... | 6 | Supramolecular Chemistry |
For most substrates, in the absence of an oxidant, the dihydrophenanthrene intermediate may reversibly open to the corresponding cis-stilbene. However, suitably substituted stilbenes cyclize irreversibly if an aromatizing elimination or hydrogen shift process can take place. Examples of these transformations are provid... | 5 | Photochemistry |
Some alternatives to IVF are:
*Artificial insemination, including intracervical insemination and intrauterine insemination of semen. It requires that a woman ovulates, but is a relatively simple procedure, and can be used in the home for self-insemination without medical practitioner assistance. The beneficiaries of ar... | 1 | Biochemistry |
Surface water can be affected by local geology, as minerals leached from sub-surface rocks can enter surface water bodies and influence water chemistry. Examples of this are the Werii River (Tigray, Ethiopia), where elevated concentrations of heavy metals have been linked to the underlying slate, and drinking wells in ... | 2 | Environmental Chemistry |
Regulatory elements that responds to other signals are known; examples include photomodulated conductances as well as "thermal switches" constructed by isomerization of the carbamate group. To date, no mechanosensitive synthetic ion channels have been reported. | 6 | Supramolecular Chemistry |
In molecular biology, the Btk-type zinc finger or Btk motif (BM) is a conserved zinc-binding motif containing conserved cysteines and a histidine that is present in certain eukaryotic signalling proteins. The motif is named after Bruton's tyrosine kinase (Btk), an enzyme which is essential for B cell maturation in huma... | 1 | Biochemistry |
In geology, silicification is a petrification process in which silica-rich fluids seep into the voids of Earth materials, e.g., rocks, wood, bones, shells, and replace the original materials with silica (SiO). Silica is a naturally existing and abundant compound found in organic and inorganic materials, including Earth... | 9 | Geochemistry |
The Two-dimensional (2-D) polymers formed by topochemical polymerization are popular topics in material chemistry. By synthesizing and polymerizing monomers with functionality greater than 2, the 2-D networks instead of linear polymers can be obtained. [4+4] and [4+2] involving anthracene units are popular choices for ... | 7 | Physical Chemistry |
Downregulation refers to the decrease in the number of receptor molecules. This is usually the result of receptor endocytosis. In this process, the bound LCGR-hormone complex binds arrestin and concentrates in clathrin coated pits. Clathrin coated pits recruit dynamin and pinch off from the cell surface, becoming clath... | 1 | Biochemistry |
The remains of diatoms and other silica-utilizing organisms are found, as opal sediments within pelagic deep-sea deposits. Pelagic sediments, containing significant quantities of siliceous biogenic remains, are commonly referred to as siliceous ooze. Siliceous ooze are particularly abundant in the modern ocean at high ... | 1 | Biochemistry |
The industrial processes vary depending on the chain length of the olefin to be hydroformylated, the catalyst metal and ligands, and the recovery of the catalyst. The original Ruhrchemie process produced propanal from ethene and syngas using cobalt tetracarbonyl hydride. Today, industrial processes based on cobalt cata... | 0 | Organic Chemistry |
Cytoplasmic transfer was originally developed in the 1980s in the course of basic research conducted with mice to study the role that parts of the cell outside of the nucleus played in embryonic development. In this technique, cytoplasm, including proteins, messenger RNA (mRNA), mitochondria and other organelles, is ta... | 1 | Biochemistry |
CRISPR-associated transposons have been harnessed for in vitro and in vivo gene editing at different targets, in different hosts, and with different payloads. All CAST components of the Tn6677 system from Vibrio cholerae have been combined into a single plasmid and confirmed to deliver up to 10kb transposons at near 10... | 1 | Biochemistry |
Each chemical species (for example, "water molecules", "sodium ions", "electrons", etc.) has an electrochemical potential (a quantity with units of energy) at any given point in space, which represents how easy or difficult it is to add more of that species to that location. If possible, a species will move from areas ... | 7 | Physical Chemistry |
Cellular noise is often investigated in the framework of intrinsic and extrinsic noise. Intrinsic noise refers to variation in identically regulated quantities within a single cell: for example, the intra-cell variation in expression levels of two identically controlled genes. Extrinsic noise refers to variation in ide... | 1 | Biochemistry |
The crystal structure was solved to 3.0 Å resolution in 2000, as shown in the figure in the reference. In (A), notice that the separate subunits appear to be anchored through interactions between an alpha helix and an adjacent subunit. In (B), there are six sets of three loops. The red loop, known as loop II, contai... | 1 | Biochemistry |
Accelerated testing of adhesives is used to predict long term performance of adhesive exposed to a variety of environmental factors. Adhesives are sometimes used as load bearing and sealing joints, which points great stress on them. In accelerated testing, factors like the temperature, moisture, vibrations, voltage, an... | 3 | Analytical Chemistry |
Nickel tetracarbonyl and iron pentacarbonyl can be prepared according to the following equations by reaction of finely divided metal with carbon monoxide:
:Ni + 4 CO → Ni(CO) (1 bar, 55 °C)
:Fe + 5 CO → Fe(CO) (100 bar, 175 °C)
Nickel tetracarbonyl is formed with carbon monoxide already at 80 °C and atmospheric pressur... | 0 | Organic Chemistry |
IPNs have been used in automotive parts (including modern automotive paint), damping materials, medical devices, molding compounds, and in engineering plastics. While many benefits come from the enhanced mechanical properties of the IPN materials, other characteristics such as resistance to solvent swelling can also ma... | 7 | Physical Chemistry |
The starting material for this route is a norbornane derivative with a good leaving group in position 2. If the leaving group is on the exo- face, electron density from the σ bond between carbons 1 and 6 is donated into the σ* antibond between carbon 2 and the leaving group (see Figure 8b).
If the leaving group is on t... | 7 | Physical Chemistry |
The most common method of measuring amino acid hydrophobicity is partitioning between two immiscible liquid phases. Different organic solvents are most widely used to mimic the protein interior. However, organic solvents are slightly miscible with water and the characteristics of both phases change making it difficult ... | 6 | Supramolecular Chemistry |
In chemistry, a triol is an organic compound containing three hydroxyl groups ( functional groups), such as glycerol. | 0 | Organic Chemistry |
Its isotope fractionation is linked to water temperature and its isotope ratios from a variety of sources have been widely used to reconstruct paleoclimate. Oxygen isotope in calcium carbonates has become the most widely applied as geothermometer for estimating ancient ocean temperatures. The most successful applicatio... | 9 | Geochemistry |
For example, a new radiolabelled compound is injected intravenously into a group of 16-20 rodents (typically mice or rats). At intervals of 1, 2, 4, and 24 hours, smaller groups (4-5) of the animals are euthanized, then dissected. The organs of interest (usually: blood, liver, spleen, kidney, muscle, fat, adrenals, p... | 1 | Biochemistry |
Favipiravir, as an antiviral drug, has been authorized for treating COVID-19 in several countries including Japan, Russia, Serbia, Turkey, India, and Thailand, under emergency provisions. A rapid meta-review in September 2020 (analyzing four studies) noted that the drug led to clinical and radiological improvements; ho... | 4 | Stereochemistry |
Recent studies focus on the integration of nanofluidic devices into microsystems. An interface should be created for the connection between two length-scales. A system with solely nanofluidic devices standalone is impractical because it would requires a large driving pressure to make fluids flow into the nano-channel.
... | 7 | Physical Chemistry |
Oil-eating bacteria biodegrade oil that has escaped to the surface. Oil sands are reservoirs of partially biodegraded oil still in the process of escaping and being biodegraded, but they contain so much migrating oil that, although most of it has escaped, vast amounts are still present—more than can be found in convent... | 7 | Physical Chemistry |
Agmatine biosynthesis by arginine decarboxylation is well-positioned to compete with the principal arginine-dependent pathways, namely: nitrogen metabolism (urea cycle), and polyamine and nitric oxide (NO) synthesis (see illustration Agmatine Metabolic Pathways). Agmatine degradation occurs mainly by hydrolysis, cataly... | 1 | Biochemistry |
Many approaches can potentially quantify radiation absorption, with key examples following.
* The absorption coefficient along with some closely related derived quantities
* The attenuation coefficient (NB used infrequently with meaning synonymous with "absorption coefficient")
* The Molar attenuation coefficient (also... | 7 | Physical Chemistry |
Many low-valent and electron-rich transition metals effect stoichiometric dehalogenation. The reaction achieves practical interest in the context of organic synthesis, e.g. Cu-promoted Ullmann coupling.
The reaction is mainly conducted as stoichiometrically. Some metalloenzymes Vitamin B12 and coenzyme F430 are capab... | 0 | Organic Chemistry |
A cosmid is a type of hybrid plasmid that contains a Lambda phage cos sequence. Often used as cloning vectors in genetic engineering, cosmids can be used to build genomic libraries. They were first described by Collins and Hohn in 1978.
Cosmids can contain 37 to 52 (normally 45) kb of DNA, limits based on the normal ba... | 1 | Biochemistry |
Another variety of transposons, discovered in 2001, which can also potentially capture host DNA. Helitrons are thought to replicate via a "rolling circle", in which transposase links the helitron to two distinct regions of the genome at once, using a helicase, ligase, and nuclease in the process to unravel the strands ... | 1 | Biochemistry |
The most common and most important cryptand is ; the systematic IUPAC name for this compound is 1,10-diaza-4,7,13,16,21,24-hexaoxabicyclo[8.8.8]hexacosane. This compound is termed [[2.2.2-Cryptand|[2.2.2]cryptand]], where the numbers indicate the number of ether oxygen atoms (and hence binding sites) in each of the th... | 6 | Supramolecular Chemistry |
The English word lichen derives from the Greek ("tree moss, lichen, lichen-like eruption on skin") via Latin . The Greek noun, which literally means "licker", derives from the verb , "to lick". In American English, "lichen" is pronounced the same as the verb "liken" (). In British English, both this pronunciation an... | 2 | Environmental Chemistry |
The primary amine on the aminoallyl nucleotide reacts with amino-reactive dyes such as a cyanine and patented dyes which contain a reactive leaving group, such as a succinimidyl ester (NHS).The amine groups directly attached to the ring of the base are not affected. These nucleotides are used for labeling DNA. | 1 | Biochemistry |
Effects of oral dosing of PEA has been explored in humans, and include clinical trials for a variety of pain states, for inflammatory and pain syndromes. Daily doses range from 300 to 1200 mg per day. In a 2017 systematic meta-analysis involving 10 studies including data from 786 patients receiving PEA for pain-related... | 1 | Biochemistry |
Recent studies have confirmed that TEs can contribute to the generation of transcription factors. However, how this process of contribution can have an impact on the participation of genome control networks. TEs are more common in many regions of the DNA and it makes up 45% of total human DNA. Also, TEs contributed to ... | 1 | Biochemistry |
Organic geochemists also have an interest in studying the diagenesis of biogenic substances in petroleum and how they are transformed in sediment and fossils. While 90% of this organic material is insoluble in common organic solvents – called kerogen – 10% is in a form that is soluble and can be extracted, from where b... | 0 | Organic Chemistry |
Hypophosphorous acid was first prepared in 1816 by the French chemist Pierre Louis Dulong (1785–1838).
The acid is prepared industrially via a two step process: Firstly, elemental white phosphorus reacts with alkali and alkaline earth hydroxides to give an aqueous solution of hypophosphites:
:P + 4 OH + 4 HO → 4 + 2 H... | 0 | Organic Chemistry |
A transition metal carbene complex is an organometallic compound featuring a divalent carbon ligand, itself also called a carbene. Carbene complexes have been synthesized from most transition metals and f-block metals, using many different synthetic routes such as nucleophilic addition and alpha-hydrogen abstraction. T... | 0 | Organic Chemistry |
Dioxane has affected groundwater supplies in several areas. Dioxane at the level of 1 μg/L (~1 ppb) has been detected in many locations in the US. In the U.S. state of New Hampshire, it had been found at 67 sites in 2010, ranging in concentration from 2 ppb to over 11,000 ppb. Thirty of these sites are solid waste land... | 6 | Supramolecular Chemistry |
Consider a freely jointed chain of N bonds of length subject to a constant elongational force f applied to its ends along the z axis and an environment temperature . An example could be a chain with two opposite charges +q and -q at its ends in a constant electric field applied along the axis as sketched in the figu... | 7 | Physical Chemistry |
Transmission Kikuchi Diffraction (TKD), also sometimes called transmission-electron backscatter diffraction (t-EBSD), is a method for orientation mapping at the nanoscale. It’s used for analysing the microstructures of thin transmission electron microscopy (TEM) specimens in the scanning electron microscope (SEM). This... | 7 | Physical Chemistry |
The model calculates the ground water levels and the incoming and outgoing ground water flows between the polygons by a numerical solution of the well-known Boussinesq equation. The levels and flows influence each other mutually.
The ground water situation is further determined by the vertical groundwater recharge that... | 9 | Geochemistry |
The pair of trigonometric functions can be thought of as parametrizing the unit circle. The stereographic projection gives an alternative parametrization of the unit circle:
Under this reparametrization, the length element of the unit circle goes over to
This substitution can sometimes simplify integrals involving t... | 3 | Analytical Chemistry |
E74-like factor 1 (ets domain transcription factor) is a protein that in humans is encoded by the ELF1 gene. | 1 | Biochemistry |
The CTCF insulator appears to have enhancer blocking activity via its 3D structure and have no direct connection with barrier activity. Vertebrates in particular appear to rely heavily on the CTCF insulator, however there are many different insulator sequences identified. Insulated neighborhoods formed by physical int... | 1 | Biochemistry |
* The process may not remove sufficient organic matter from the wastewater.
* The sludge age may be too low to enable nitrification.
The typical control band for the concentration of MLSS is 2 to 4 g/L for conventional activated sludge, or up to 15 g/L for membrane bioreactors.
One of the easiest control procedures for... | 3 | Analytical Chemistry |
The stereochemical term enantiotopic refers to the relationship between two groups in a molecule which, if one or the other were replaced, would generate a chiral compound. The two possible compounds resulting from that replacement would be enantiomers.
For example, the two hydrogen atoms attached to the second carbon... | 4 | Stereochemistry |
Methanogens are observed in anoxic soil environments, contributing to the degradation of organic matter. This organic matter may be placed by humans through landfill, buried as sediment on the bottom of lakes or oceans as sediments, and as residual organic matter from sediments that have formed into sedimentary rocks. | 1 | Biochemistry |
PI-3K is one of the important components in the regulation of the insulin signaling pathway. It maintains the insulin sensitivity in the liver. PI-3K is composed of a regulatory subunit (P85) and a catalytic subunit (P110). P85 regulates the activation of PI-3K enzyme. In the PI-3K heterodimer (P85-p110), P85 is respon... | 1 | Biochemistry |
Generally the goal of this type of sample cell is to improve detection sensitivity by increasing the total optical path length that travels through a small, constant sample volume. In principle, a longer path length results in greater detection sensitivity. Focusing mirrors must be used to redirect the beam at each ref... | 7 | Physical Chemistry |
Metallic parts produced by casting are comparatively inexpensive, but are often subject to metallurgical flaws like porosity and microstructural defects. Friction stir processing can be used to introduce a wrought microstructure into a cast component and eliminate many of the defects. By vigorously stirring a cast meta... | 8 | Metallurgy |
The Bionic Leaf is a biomimetic system that gathers solar energy via photovoltaic cells that can be stored or used in a number of different functions. Bionic leaves can be composed of both synthetic (metals, ceramics, polymers, etc.) and organic materials (bacteria), or solely made of synthetic materials. The Bionic Le... | 5 | Photochemistry |
The indenyl effect refers to an explanation for the enhanced rates of substitution exhibited by η-indenyl complexes vs the related η-cyclopentadienyl complexes.
Associative substitution occurs by the addition of a ligand to a metal complex followed by dissociation of an original ligand. Associative pathways are not typ... | 0 | Organic Chemistry |
Photorespiration (also known as the oxidative photosynthetic carbon cycle or C cycle) refers to a process in plant metabolism where the enzyme RuBisCO oxygenates RuBP, wasting some of the energy produced by photosynthesis. The desired reaction is the addition of carbon dioxide to RuBP (carboxylation), a key step in the... | 5 | Photochemistry |
Atomic polarization is observed when the nucleus of the atom reorients in response to the electric field. This is a resonant process. Atomic polarization is intrinsic to the nature of the atom and is a consequence of an applied field. Electronic polarization refers to the electron density and is a consequence of an app... | 7 | Physical Chemistry |
The minor spliceosome is a ribonucleoprotein complex that catalyses the removal (splicing) of an atypical class of spliceosomal introns (U12-type) from messenger RNAs in some clades of eukaryotes. This process is called noncanonical splicing, as opposed to U2-dependent canonical splicing. U12-type introns represent les... | 1 | Biochemistry |
Twin helical strands form the DNA backbone. Another double helix may be found by tracing the spaces, or grooves, between the strands. These voids are adjacent to the base pairs and may provide a binding site. As the strands are not directly opposite each other, the grooves are unequally sized. One groove, the major gro... | 4 | Stereochemistry |
* During energy transformations in living systems, order and organization must be compensated by releasing energy which will increase entropy of the surrounding.
* Organisms are open systems that exchange materials and energy with the environment. They are never at equilibrium with the surrounding.
* Energy is spent ... | 1 | Biochemistry |
Tungsten(VI) oxide (WO), which exhibits several different polymorphs at various temperatures, is of interest due to its high conductivity but has a relatively wide, indirect band gap (~2.7 eV) which means it cannot absorb most of the solar spectrum. Though many attempts have been made to increase absorption, they resul... | 5 | Photochemistry |
There are three main phases of biofilm development and rhamnolipids are implicated in each phase. Rhamnolipids are reported to promote motility, thereby inhibiting attachment by preventing cells from adhering tightly to the substratum. During biofilm development, rhamnolipids are reported to create and maintain fluid c... | 0 | Organic Chemistry |
Heterogeneous cross-coupling catalysts typically lose some portion of activity to metal leaching between different runs as a result of the solution-phase catalytic cycle (see above), and hence can only be recycled a finite number of times.
Multiple groups have pointed out that the need for recycling is obviated at extr... | 0 | Organic Chemistry |
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