Denaturation may refer to Denaturation biochemistry , a structural change in macromolecules caused by extreme conditions Denaturation fissile materials , transforming fissile materials so that they cannot be used in nuclear weapons Denaturation food , intentional adulteration of food or drink rendering it unfit for consumption while remaining suitable for other uses See also Denatured alcohol , also known as methylated spirit Denaturalization , the reverse of naturalization, when a state deprives one of its citizens of his or her citizenship disambig de Denaturierung pl Denaturacja uk ... more details
main Protein folding Chevron plot Assuming two state protein folding , denaturation midpoint is defined as that temperature Tm or Denaturation biochemistry denaturant concentration Cm at which both the folded and Denaturation biochemistry unfolded states are equally populated at equilibrium. If the widths of the folded and unfolded wells are assumed to be equal both these states will have identical free energies at the midpoint. However, for natural proteins this is not the case. There is an inherent asymmetry as evidenced by the difference in heat capacity heat capacities between them the folded ensemble has a lower heat capacity in other words, lower fluctuation s thus indicating a narrower well than the unfolded ensemble. This would mean that the free energy of the folded state is lower at the denaturation midpoint than the unfolded state. In such a scenario, the temperature at which both the wells have identical free energies is termed the characteristic temperature To . ref name Munoz Munoz V & Sanchez Ruiz JM. 2004 . Exploring protein folding ensembles A variable barrier model for the analysis of equilibrium unfolding experiments. Proc. Natl. Acad. Sci. USA 101 17646 17651. ref References references Category Protein structure ... more details
denaturing is reversible. Protein denaturation Denatured proteins can exhibit a wide range of characteristics ... state , but still functionally active. How denaturation occurs at levels of protein structure See also Protein structure In Protein quaternary structure quaternary structure denaturation, protein ... tertiary structure Tertiary structure denaturation involves the disruption of Covalent interactions ... secondary structure secondary structure denaturation, proteins lose all regular repeating patterns ... together by covalent peptide bond s, is not disrupted by denaturation. ref Tanford C 1968 . Protein denaturation . Adv. Prot. Chem. 23 121 282 ref Loss of function Most biological substrates lose ... proteins unlike egg whites , denaturation is reversible the proteins can regain their native state ... ref Nucleic acid denaturation main Nucleic acid thermodynamics The denaturation of nucleic acid s such as DNA ... McGraw Hill Online Learning Center &mdash Animation Protein Denaturation DEFAULTSORT Denaturation ... more details
Unreferenced date September 2007 Denaturation of fissile materials suitable for nuclear weapon s is the process of transforming them into a form that is not suitable for weapons use and can not easily be reversely transformed. For Uranium 235 this is straightforward, by mixing it with Uranium 238 , but for plutonium it is more difficult and or less effective, because other plutonium isotope s are either also suitable for weapons or not available and not practical to produce, while mixing with another element allows chemical separation. The situation with Uranium 233 is more drastic. Decay of the attached Uranium 232 produces Thorium 228 with a radioactive half life of 1.9 years and several short lived daughter nuclides these daughters include some very hard gamma ray emitters like Thallium 208 and Lead 212 . After approximately one single year the alpha activity of these decay products is several hundred curies per kilogram of U 233, and the gamma penetration radiation is a thousand times larger to some than from the plutonium. Aged U 233 is self protected radiologically from diversion. Category Isotope separation nuclear stub de Abreicherung ... more details
Food is deliberately denatured when a substance, known as a denaturant , is added to render the food unpleasant to consume or poisonous. Aversive agent s primarily bitterant s and pungent pungent agents are used to produce an unpleasant flavor. For example, the bitterant denatonium might be added to food used in the laboratory , where the food is not intended for human consumption. A poison may be added as an even more powerful deterrent. For example, methanol is added to ethanol to produce denatured alcohol . The addition of poisonous methanol renders denatured alcohol unfit for consumption. Thus denatured alcohol is not subject to the taxes alcoholic beverages are subject to. ingredient stub Category Food additives ca Desnaturalitzaci ind stria cs Denaturovan ethanol da Husholdningssprit de Verg llung fi Denaturointi fr Alcool d natur hu Denatur lt szesz ja nl Denatureren no R dsprit pl Denaturat ru sv Teknisk sprit uk zh ... more details
Deactivation may refer to Protein denaturation , the process of disrupting the structure of proteins or nucleic acids Drug metabolism Sterilization microbiology , the process of rendering microorganisms unable to replicate disambig ... more details
DnaA is a replication initiation factor which promotes the unwinding or denaturation of DNA at oriC, during DNA replication in prokaryotes. DNAA may also refer to Nnamdi Azikiwe International Airport located in Abuja, FCT, Nigeria. Its ICAO airport code is DNAA disambig ... more details
About the skin that forms on top of milk the ingredient Scalded milk Milk skin refers to a sticky film of protein that forms on top of milk and milk containing liquids such as hot chocolate and some soups . It is caused by the Denaturation biochemistry denaturation of proteins such as casein . When milk is boiled, soluble milk proteins are denatured and then aggregate and form a sticky film across the top of the liquid, which then dries by evaporation . In Japan , a dairy product called So Dairy So was made from layers of milk skin during the 7th 10th centuries. So was further processed to make Daigo Cheese Daigo . In Nepal this skin is referred to as turr and many people enjoy consuming the skin along with the milk. Category Milk es Nata cuajada no Snerk ... more details
orphan date May 2010 An extremozyme is an enzyme , often created by extremophiles that can function under extreme environmental conditions such as very high pH , very low pH , high temperature , high salinity , or other factors, that would otherwise Denaturation biochemistry denature typical enzymes e.g. catalase , rubisco , carbonic anhydrase . ref http www.ornl.gov info ornlreview rev32 3 amazing.htm ref See also Extremophile Berkeley Pit Enzyme Polypeptide Protein Allostery References reflist Category Proteins Category Extremophiles ... more details
Circular molecules of DNA , such as plasmids and typical mitochondrial genome s, consist of Nucleic acid double helix two strands of DNA called the heavy strand or H strand and the light strand or L strand . The two strands have different masses due to different proportions of heavier nucleic acid s. While this difference is not known to have any functional significance, it can be used in the laboratory to segregate the strands of Denaturation biochemistry Nucleic acid denaturation denatured DNA, and hence to analyze the strands separately. Adenine and guanine purine s are heavier than cytosine and thymine pyrimidine s due to their extra ring. Because a purine always DNA Base pairing pairs with a pyrimidine, any excess of purines in one strand will occur with a corresponding excess of pyrimidines in the other strand and vice versa. Statistically, there is more likely to be such an imbalance than an exact 50 50 ratio. In addition, bias may arise due to differentials in the amount of protein coding sequence on each strand, as codon s do not all occur with equal frequency. Category DNA biology stub ... more details
File ER Terminal cleaning.jpg right 256px Nonflammable alcohol vapor in CO sub 2 sub NAV CO2 systems use carbon dioxide CO sub 2 sub as a propellant to dispense a 56 isopropyl alcohol solution in a stream of CO sub 2 sub gas. The use of CO sub 2 sub as a propellant serves to displace ambient oxygen and eliminate the risk of explosion. Application Alcohol is a wide spectrum disinfectant that kills bacteria and viruses through Denaturation biochemistry denaturation . NAV CO sub 2 sub allows alcohol to be used safely in an atomized vapor , capable of reaching nooks, crannies and crevices that would be beyond the reach of other disinfecting methods. NAV CO sub 2 sub systems have been used to fight nosocomial infections including methicillin resistant Staphylococcus aureus and other pathogens such as HIV , norovirus , hepatitis , tuburculosis , and listeria . Advantages CO sub 2 sub is gas at room temperature, while liquid alcohol evaporates off of contact surfaces within minutes after application. Surfaces do not require wiping, reducing the spreading of pathogens on cloths. Alcohol and CO sub 2 sub are inexpensive and readily available. Environmental advantages include a viable alternative to oxidizing sanitizers such as bleach . External links http www.sanisys.com Home page Sanisys LLC. http www.biomistinc.com Home page Biomist Inc. Category Disinfectants ... more details
Nicking Enzyme Amplification Reaction NEAR is a method for in vitro DNA amplification like the polymerase chain reaction PCR . NEAR is isothermal, replicating DNA at a constant temperature using a polymerase and nicking enzyme to exponentially amplify the DNA at a temperature range of 55 C to 59 C. The disadvantage of PCR is that it consumes a lot of time with uncoiling the double stranded DNA with heat into single strands a process called Denaturation biochemistry denaturation and copying the single strands to create new double stranded DNA Biosynthesis synthesis . This leads to amplification times typically thirty minutes or more for significant production of amplified products. Citation needed date March 2010 The advantages of NEAR over PCR are increased speed, reduced costs, lower energy requirements and the ability to perform the reaction in the field. Citation needed date March 2010 The disadvantage of NEAR to PCR is that background production is a common issue with reactions due to the infancy of the technology. Citation needed date March 2010 References United States Patent 7,972,820. July 5, 2011. Isothermal amplification of nucleic acids on a solid support. Category Molecular biology biochem stub ... more details
wiktionarypar coagulation Coagulation may refer to Coagulation, in colloid chemistry , a process in which dispersed colloidal particle s agglomerate. See flocculation or particle aggregation Coagulation clotting of blood Coagulation milk , the coagulation of milk into curd by rennet or acid Denaturation biochemistry , a structural change in biomolecules A process for purifying water in water treatment Mixing of two particles in an aerosol to form a third particle Clumping of dust particles in a protoplanetary disk , a possible early stage of planet formation See also Flocculation disambig bs Koagulacija vor cs Sr en de Koagulation fr Coagulation it Coagulazione disambigua ru fi Koagulointi ... more details
Julius Marmur March 22, 1926 May 20, 1996, aged 70 was an American molecular biologist who made significant contributions to DNA research. His discovery, while working in the laboratory of Paul Doty at Harvard University , that the Denaturation biochemistry Nucleic acid denaturation denaturation of DNA was reversible and depended on salt and GC content , ref cite journal author Marmur J, Doty P title Determination of the base composition of deoxyribonucleic acid from its thermal denaturation temperature journal J Mol Biol year 1962 volume 5 pages 109 18 doi 10.1016 S0022 2836 62 80066 7 pmid 14470099 ref had a major impact on how scientists thought about DNA, and how DNA could be handled in vitro this discovery was a cornerstone of the recombinant DNA revolution. Marmur spent most of his professional career at the Albert Einstein College of Medicine AECOM , medical school in the Bronx , NY affiliated with Yeshiva University . In a historical context, Marmur s research can be seen as bridging the work of the 1940s and 1950s, as exemplified by Rollin Hotchkiss , with the work of the 1970s and beyond. AECOM, while supporting an annual symposium in Marmur s honor, does not list his biography on their web site. A standard work on the history of molecular biology, such as Horace Freeland Judson s The eighth day of creation , may be consulted. References references Further reading cite journal author Doty P title Julius Marmur 1926 96 journal Nature year 1996 volume 381 issue 6583 pages 557 doi 10.1038 381557a0 pmid 8637585 cite journal author Szybalski W title In memoriam. Julius Marmur 1926 1996 journal Gene volume 204 issue 1 2 pages 1 3 doi 10.1016 S0378 1119 97 00544 1 year 1997 pmid 9463079 Persondata Metadata see Wikipedia Persondata . NAME Marmur, Julius ALTERNATIVE NAMES SHORT DESCRIPTION DATE OF BIRTH March 22, 1926 PLACE OF BIRTH DATE OF DEATH May 20, 1996 PLACE OF DEATH DEFAULTSORT Marmur, Julius Category American scientists Category 1926 births Category 1996 d ... more details
Chinese t wikt wikt wikt wikt s wikt wikt wikt wikt p ji ng zh zhu ng n i j goeng1 zap1 zong6 naai5 l Ginger collides with milk File Ginger Milk Pudding.jpg thumb Ginger milk curd Ginger milk curd , also known as ginger juice milk curd , ginger milk pudding or simply ginger milk , is a Chinese cuisine Chinese hot dessert originated in Shawan town of Panyu District, Guangzhou in the Guangdong Province in northern and southern China southern China . The main ingredients are ginger , milk , and sugar . domestic buffalo Water buffalo milk is used in the original recipe. Method of preparation First, squeeze the juice from a piece of ginger, then filter the juice finely and put into a bowl vessel bowl . Next, dissolve sugar in milk, then heat until it simmers. Take off heat immediately and allow it to cool a little. Finally, pour the mixture quickly into the bowl of ginger juice and wait for two to three minute s. The milk will then solidify, and may be eaten with a spoon . Underlying biochemical principle Ginger contains protease . When milk is added to ginger juice, protease catalyses Denaturation biochemistry denaturation of the protein in the milk, changing it from a water soluble form to a water insoluble form, and leads to the formation of milk curd. See also Douhua Junket dessert External links http www.flickr.com search ?q E8 96 91 E6 B1 81 E6 92 9E E5 A5 B6&w all Ginger milk curd photos Cantonese cuisine Category Chinese dessert Category Cantonese cuisine Category Milk Category Ginger Milk curd China cuisine stub dessert stub ja zh yue zh ... more details
ref Anson ML, Protein Denaturation and the Properties of Protein Groups, Advances in Protein ... . Chemical denaturation In the less expensive technique of equilibrium unfolding , the fractions ... the unfolded state, e.g., by adding a denaturation biochemistry denaturant such as guanidine ... assume that only two thermodynamic states are populated de populated upon denaturation. They could ... sites exposed in the unfolded state is seen as the reason for denaturation transitions. An elementary ... concentration. Thus the analysis of denaturation data with this model requires 7 parameters math ... for the LEM and it is purely empirical, though it is widely used in interpreting solvent denaturation ... m sub represents the denaturant concentration at which 50 of the molecules are folded the denaturation ... folding or strongly unfolding conditions. Thermal denaturation Assuming a two state denaturation as stated ... under investigation. The thermodynamic observables of denaturation can be described by the following ... denaturation as follows math Delta ASA ASA unfolded ASA native math For proteins that have a known .... The can be done with differential scanning calorimetry by comparing the calorimetric enthalpy of denaturation ... capacity peak. Other forms of denaturation Analogous functional forms are possible for denaturation ... more details
can be cut with the same restriction enzyme DpnII to remove adapter R . Denaturation and Subtractive ... cDNA bound to Tester cDNA After the first round of Denaturation biochemistry denaturation and nucleic ... of denaturation and hybridization, and PCR amplification. This further enriches the Tester cDNA bound ... more details
Unreferenced stub auto yes date December 2009 Photodegradation is degradation of a photodegradable molecule caused by the absorption of photons , particularly those wavelengths found in sunlight , such as infrared radiation , visible light , and ultraviolet light . However, other forms of electromagnetic radiation can cause photodegradation. Photodegradation includes photodissociation , the breakup of molecules into smaller pieces by photons. It also includes the change of a molecule s shape to make it irreversibly altered, such as the denaturation biochemistry denaturing of proteins , and the addition of other atom s or molecules. A common photodegradation reaction is oxidation . This type of photodegradation is used by some drinking water and wastewater facilities to destroy pollutants. Photodegradation in the environment is part of the process by which ambergris evolves from its fat ty precursor. The US federal standard for testing plastic for photodegradation is 40 CFR Ch. I 7 1 03 Edition PART 238 Photo degradation also destroys paintings and other artifacts. Applications Six pack rings Six pack soda can rings have been photodegradable LDPE plastic since the 1990s. See also Biodegradable plastic Category Chemical reactions Chemistry stub cs Fotodegradace it Fotodegradazione nl Fotodegradatie th ... more details
HaeIII is one of many restriction enzyme s endonuclease s discovered since 1970. It was the third endonuclease to be isolated from the Haemophilus influenzae biogroup aegyptius Haemophilus aegyptius bacteria , and has a molecular weight of 37126. The enzyme s recognition site&mdash the place where it cuts DNA molecules&mdash is the GGCC nucleotide sequence. This enzyme s gene has been sequenced and cloned. Mechanism of action The enzyme cleaves the DNA at the positions where the GGCC sequence is found. The cleavage occurs between the second and the third nucleotides Guanine G and Cytosine C . The resulting DNA fragments are known as restriction fragment s. HaeIII cuts both strands of DNA in the same location, yielding restriction fragments with blunt ends . Heat denaturation occurs at 80 C after 20 minutes ref http www.thelabrat.com restriction HaeIII.shtml HaeIII Restriction Enzyme ref References Reflist Rawn, J. David 1989 . Biochemistry, International Edition . ISBN 0 89278 405 9 http www.ncbi.nlm.nih.gov entrez viewer.fcgi?val 2961232&itemID 2&view gbwithparts NCBI Sequence Viewer . Category Molecular biology Category Restriction enzymes molecular cell biology stub enzyme stub es HaeIII pl HaeIII sv HaeIII ... more details
Pfam box Symbol Seed protein pln Name Small hydrophilic plant seed protein Pfam PF00477 InterPro IPR000389 PROSITE PDOC00355 PDB Plant seed proteins are small hydrophilic proteins some of which are structurally related. These proteins contains from 83 to 153 amino acid residues and may play a role ref name PUB00015278 cite journal author Bray EA title Molecular Responses to Water Deficit journal Plant Physiol. volume 103 issue 4 pages 1035 1040 year 1993 pmid 12231998 pmc 159086 ref ref name PUB00003758 cite journal author Gaubier P, Raynal M, Hull G, Huestis GM, Grellet F, Arenas C, Pages M, Delseny M title Two different Em like genes are expressed in Arabidopsis thaliana seeds during maturation journal Mol. Gen. Genet. volume 238 issue 3 pages 409 418 year 1993 pmid 8492809 ref in equipping the seed for survival, maintaining a minimal level of hydration in the dry organism and preventing the denaturation of cytoplasmic components. They may also play a role during imbibition by controlling water uptake. References reflist InterPro content IPR000389 Category Protein families ... more details
Aversive agents are unpleasantly flavored substances added to poisonous household goods in order to discourage children from consuming the poisonous household products. Aversive agents are not intended to be harmful, only unpleasant. For example, to prevent children from consuming poisonous anti freeze , which has a sweet flavor due to the propylene glycol , an aversive agent is added, which gives the anti freeze an unpleasant taste. There are two primary classes of aversive agents bitterant s, chemicals producing a bitter flavor, and pungent agents , chemicals producing an unpleasantly pungent flavor. ref Cite conference first last authorlink coauthors title Final Report Study of Aversive Agents booktitle pages publisher Consumer Product Safety Commission United States of America date 18 November 1992 location url http www.cpsc.gov LIBRARY FOIA foia99 os aversive.pdf doi id accessdate 15 November 2010 ref See also Denaturation food , the deliberate addition of an unpleasantly flavored or poisonous substances to food in order to prevent the consumption of the food for various reasons. Adulterant , a substance added to food for deceptive or malicious reasons, for example to cheaply replace legitimate ingredients. Denatonium , also known as Bitrex , an aversive agent often added to household products. References reflist Category Food additives ... more details
In cooking , brining is a process similar to marination in which meat is soaked in brine before cooking. ref name oFaC cite book last McGee first Harold title On Food and Cooking ON FOOD AND COOKING, The science and lore of the kitchen year 2004 publisher Scribner isbn 978 0 684 80001 1 pages 155 156 ref Brining makes cooked meat moister by hydrating the cells of its muscle tissue before cooking, via the process of osmosis , and by allowing the cells to hold on to the water while they are cooked, via the process of denaturation biochemistry denaturation . ref name oFaC The brine surrounding the cells has a higher concentration of salt than the fluid within the cells, but the cell fluid has a higher concentration of other solutes . ref name oFaC This leads salt ion s to diffusion diffuse into the cell, whilst the solutes in the cells cannot diffuse through the cell membranes into the brine. The increased salinity of the cell fluid causes the cell to absorb water from the brine via osmosis. ref name oFaC The salt introduced into the cell also denatures its protein s. ref name oFaC The proteins coagulate, forming a matrix that traps water molecules and holds them during cooking. This prevents the meat from dehydration dehydrating . In many foods the additional salt is also desirable as a preservative . Some cheese s are periodically washed in brine during their ripening. Not only does the brine carry flavors into the cheese it might be seasoned with spices or wine , but the salty environment may nurture the growth of the Brevibacterium linens bacteria , which can impart a very pronounced odor Limburger and interesting flavor. The same bacteria can also have some effect on cheeses that are simply ripened in humid conditions, like Camembert cheese Camembert . Large populations of these smear bacteria show up as a sticky orange red layer on some brine washed cheeses. See also Pickling Pickling salt References Reflist External links http www.cookingforengineers.com article ... more details
Encyclopedia
top
