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Topic: Lowry protein assay

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	Protein Assay
		Protein assays determine the amount of protein in an unknown solution.
		Protein assays enable biochemists to characterize one of the two defining properties of enzymes (the other being activity).
		Proteins are polymers of amino acids, where amino acid units are joined by peptide bonds which have partial double bond character and absorb light.
	www.iscid.org /encyclopedia/Protein_Assay (324 words)

	Assay
		An assay is a procedure where the concentration of a component part of a mixture is determined.
		There are numerous applications of an assay, such as an antigen capture assay, bioassay, competitive protein binding assay, four-point assay, immunoassay, microbiological assay, stem cell assay, and many others.
		Assays are regularly utilized in scientific research laboratories.
	www.ibpassociation.org /encyclopedia/Chemistry/Assay.php (296 words)

	Bradford protein assay
		These include measurement of the protein's intrinsic UV absorbance and three methods which generate a protein-dependent color change; the Lowry assay (2), the Smith copper/bicinchoninic assay (3) and the Bradford dye assay (4).
		Again, this assay requires that the protein solution be free of other UV absorbing substances, and that the measurements be made using a quartz cuvette.
		The Lowry and copper/bicinchoninic assays are based on reduction of Cu to Cu by amides.
	www.science.smith.edu /departments/Biochem/Biochem_353/Bradford.html (1248 words)

	Automating a Lowry Protein Assay with BioTek's Precision XS Microplate Sample Processor \| Poster Presentations
		Assays that are run in a microplate format use multi-channel pipettes for fluid delivery as a means to increase efficiency.
		The Lowry assay performed on the Precision XS is essentially the micro Lowry assay [1] that has been adapted to microplates and automated.
		Protein samples were prepared by diluting stock solutions of bovine serum albumin (BSA) to various concentrations, and 1 ml was distributed into 13- x 100-mm sample tubes and the tubes placed in the remaining spaces of the 48-tube rack of the Precision XS.
	www.biotek.com /products/tech_res_detail.php?id=140 (2527 words)

	Reference.com/Encyclopedia/Assay
		There are numerous types of assays, such as an antigen capture assay, bioassay, competitive protein binding assay, four-point assay, immunoassay, microbiological assay, stem cell assay, and many others.
		Assays are regularly utilized in molecular biology scientific research laboratories.
		Viral plaque assay: Used to calculate the number of viruses present in a sample.
	www.reference.com /browse/wiki/Assay (247 words)

	Protein determination with the modified Lowry method
		Absorbance assays: [absorbance at 280 nm] [absorbance at 205 nm] [extinction coefficient]
		The Lowry assay (1951) is an often-cited general use protein assay.
		The Hartree version of the Lowry assay, a more recent modification that uses fewer reagents, improves the sensitivity with some proteins, is less likely to be incompatible with some salt solutions, provides a more linear response, and is less likely to become saturated.
	www.ruf.rice.edu /~bioslabs/methods/protein/lowry.html (845 words)

	Protein determination by the Bradford method
		In assays using 5 ml color reagent prepared in lab, the sensitive range is closer to 5 to 100 µg protein.
		The assay is based on the observation that the absorbance maximum for an acidic solution of Coomassie Brilliant Blue G-250 shifts from 465 nm to 595 nm when binding to protein occurs.
		A rapid and sensitive for the quantitation of microgram quantitites of protein utilizing the principle of protein-dye binding.
	www.ruf.rice.edu /~bioslabs/methods/protein/bradford.html (669 words)

	The Bradford Assay
		Different proteins, however, have widely different extinction coefficients at both 280 and 205 nm, and concentration estimates obtained this way should be viewed with considerable scepticism.
		The Lowry and copper/bicinchoninic assays are based on reduction of Cu to Cu by amides (as found along the polypeptide backbone).
		Like the other assays, however, its response is prone to influence from nonprotein sources, particularly detergents, and becomes progressively more nonlinear at the high end of its useful protein concentration range.
	www.msstate.edu /dept/Biochemistry/faculty/willeford/proteins/bradford.html (628 words)

	Lowry Protein assay-å¦æ¯ä¸ç½‘ç»ææ¯åå®¢
		The Lowry procedure is one of the most venerable and widely-used protein assays, being first described in 1951 [Lowry et al., J. Biol.
		While widely used, the Lowry procedure is less preferable an assay than some other protein assays since it is more subject to interference by a wide variety of chemicals.
		Among the chemicals reported to interfere with the Lowry procedure are barbital, CAPS, cesium chloride, citrate, cysteine, diethanolamine, dithiothreitol, EDTA, EGTA, HEPES, mercaptoethanol, Nonidet P-40, phenol, polyvinyl pyrrolidone, sodium deoxycholate, sodium salicylate, thimerosol, Tricine, TRIS and Triton X-100.
	www.eryi.org /blog/post/biochemistry_lowryassay.html (358 words)

	Protein Assay
		Protein determination is one of the most common operations performed in biochemical research.
		The principle of the bicinchoninic acid (BCA) assay is similar to the Lowry procedure, in that both rely on the formation of a Cu protein complex under alkaline conditions, followed by reduction of the Cu to Cu The amount of reduction is proportional to the protein present.
		This provides a basis to monitor the reduction of alkaline Cu+2 by proteins and thus determine the protein concentration in a biochemical sample.
	www.soltecventures.com /bcaproteinassay.htm (167 words)

	HistoSoft » Bradford Assay » Bradford Assay Background
		The Bradford Assay is a colorimetric assay for measuring total protein concentration in a given solution.
		Besides selecting the protein standard that most closely mimics the properties of the experimental protein samples, one should adjust the protein concentrations based upon the standard stock concentration and the expected range of the protein of interest in solution.
		Bradford, M.M. (1976) A rapid and sensitive method for the quantitation of microgram quantities of protein utilizing the principle of protein-dye binding.
	www.histosoft.com /services/background/ba/baback.html (1206 words)

	Biocompare - Product Literature Center (Site not responding. Last check: 2007-10-20)
		For example, it is required to calculate and monitor the protein yield after various enrichment or purification processes as well as to optimize and standardize downstream experiments such as protein-protein- interaction studies.
		The absorbance was measured with a fluorescence microwell plate reader at 690 nm for Lowry and 595 nm for Bradford measurements.
		The same standards and samples of the three proteins were also separated on 4—20% gradient gels for two hours at a constant voltage of 125 V. For a better comparison with the bioanalyzer the same amount of starting material (4 µl) was loaded in each gel well.
	www.biocompare.com /techart.asp?id=878 (2203 words)

	ProteomeLab™ DU® 800 Protein Characterization System
		It determines protein concentrations using commercial assays and is best suited for comprehensive enzyme kinetics/mechanism studies.
		The total amount of protein is determined with the Protein Assay Analysis application using commercial assays such as Lowry, Bradford, Biuret, etc. that allow the quick calculation of concentrations with a standard curve.
		Protein Assay Analysis - Calculates protein concentrations using the Bradford, Lowry, Biuret, Direct UV, Colloidal Gold, or Bicinchoninate (BCA) methods.
	www.beckman.com /products/instrument/protein/proteomelab_du800_dcr.asp (467 words)

	Preparation of whole cell homogenates of cultured mammalian cells
		We typically collect several pellets from a given system and use one pellet for a Lowry protein assay to assign the amount of protein in each pellet.
		The procedure below assumes at least 2 mg of protein in a sample but it is preferable to have at least 10 mg.
		Several pellets may be combined to produce a suitable amount of protein in one sample.
	www.healthsystem.virginia.edu /internet/biomolec/2dgelsampleprep.cfm (568 words)

	Dr. Clark's Section
		Lowry A: 2% Na2CO3 in 100 mM NaOH
		The orcinol assay measures the concentration of ribose (deoxyribose gives about 5% the reaction of ribose; since the amount of DNA in a cell is much less than that of RNA, its impact on the assay will be negligible).
		Because proteins are a lot smaller on average than DNA or RNA, we normally use a gel made of the artificial polymer, polyacrylamide, which gives smaller gaps in its meshwork than agarose.
	www.science.siu.edu /microbiology/micr480/DCpart.html (7010 words)

	Frequently asked questions: Medical gloves, protein testing, and latex allergy.
		The modified Lowry protein assay detects levels of water soluble proteins in the gloves under test.
		An assumption is made with this test that the level of protein detected correlates with the likelihood of the glove producing an immediate (Type I) hypersensitivity reaction in a user or patient.
		SMTL (in association with an independent rubber consultant) therefore suggest that, for initial assessment of gloves from any company for measurement of protein, two left and two-right hand gloves should be taken from a single nominal lot (4 samples for Examination gloves).
	www.smtl.co.uk /MDRC/Gloves/Protein-FAQ.html (463 words)

	Current Protocols in Pharmacology
		When assay results are not consistent with published data, the troubleshooting guide provided in Table 1.4.4 should be consulted for guidance on where to begin searching for problems with these protocols and how to correct them.
		After assay validation is complete, typically at least 60 titration curves can be determined in a day, and for general screening at a single concentration of drug, at least 750 data points can be generated in a day when assays are performed and filtered using a 96-well format.
		Filter binding may decrease as protein concentration in the assay is increased, resulting in both total and specific binding that does not seem to show good linearity with protein concentration.
	www.does.org /masterli/phfeatp.htm (4288 words)

	American College of Surgeons: Committee on Perioperative Care: Latex Allergy: How Safe are your Gloves?
		The present tests for latex allergens are the Lowry test, achemical method based on the binding of chromogenic dye to proteinresidues, and two essentially equivalent immunochemical tests, the LEAP(Latex ELISA for Antigenic Protein) assay, which uses rabbit IgG, and a human IgE inhibition assay (RAST).
		The immunochemical methods detect proteins at a level of 0.2 [gm]g/gram protein for rabbit IgG and the human IgE, while the lower limit for the modified Lowry method is 28 [gm]g/gram protein.
		Another advantage of low protein, powder-free gloves is that they hydrate more slowly and thus maintain their tensile and tactile properties as well as their resistance to chemical and viral transfer.
	www.facs.org /about/committees/cpc/oper0797.html (1400 words)

	December 20, 1996 Final Exam (Dr. Ted Chase) (Site not responding. Last check: 2007-10-20)
		reaction with the protein is incomplete, due to exhaustion of the reagent.
		the protein yields a cloudy precipitate at this concentration.
		In the comparison of the three assays of d-amino acid oxidase, the peroxidase and polarograph assays generally showed less activity (units/ml stock enzyme) than the pyruvate assay.
	aesop.rutgers.edu /~dbm/ex1996a.html (1342 words)

	Protein Quantitation/Lowry Protein Assay Protocols
		Lowry Protein Determination (Dr. Mario Lebendiker, The Hebrew University of Jerusalem)
		The method is based on both the Biuret reaction, where the peptide bonds of proteins react with copper under alkaline conditions producing Cu+, which reacts with the Folin reagent, and the Folin-Ciocalteau reaction, which is poorly understood but in essence phosphomolybdotungstate is reduced to heteropolymolybdenum blue by the copper-catalyzed oxidation of aromatic amino acids.
		Protein determination according to Lowry procedures for protein solution with interference, or for membrane extracts.
	www.protocol-online.org /prot/General_Laboratory_Techniques/Quantitation/Protein_Quantitation/Lowry_Protein_Assay/index.html (401 words)

	Sempermed Glossary CondensedComplete medical supplies for all durable medical equipment needs
		The Lowry Protein Assay is a test method used to determine the concentration of total protein present in a sample.
		A protein detection agent is then added that increases in color intensity with increasing amounts of protein.
		Studies have shown powder to function as abrasive particles, immunological activators, and possibly as vehicles for the dissemination of chemicals, proteins and microorganisms.
	www.grogans.com /gloves.jsp?documentid=184 (988 words)

	CETP and lipid transfer inhibitor protein are uniquely affected by the negative charge density of the lipid and protein ...
		In general, assays contained 10 µg cholesterol each of the indicated donor and acceptor, and 10.6 µg CETP in a total volume of 0.5 ml.
		of LDL protein (REM decreased from 1.0 to 0.4) by neuraminidase
		Assays contained 10 µg cholesterol each of the indicated donor and acceptor, 10.6 µg CETP, ± 3.1 µg LTIP in a total volume of 0.5 ml.
	www.jlr.org /cgi/content/full/44/12/2287 (6056 words)

	Promega - FAQs
		This characteristic, as well as the ease and sensitivity of the assay for CAT activity, has made the CAT gene one of the most widely used reporter genes for studies of mammalian gene expression (2, 3).
		The CAT Enzyme Assay can be completed in as little as 2-3 hours, is linear for three orders of magnitude of enzyme activity, and can detect as little as 2pg of CAT.
		The thin layer chromatography assay is less sensitive and more time-consuming to perform than the liquid scintillation counting assay, but is useful as a visual confirmation of assay results.
	www.promega.com /faq/catfaq.html (1314 words)

	lowry protein - best site resources
		All the lowry protein information you need to know about is right here.
		The principle behind the Lowry method of determining protein concentrations lies in the reactivity of the peptide...
		The lowry protein resources below will assist you in your efforts to find the information that you are looking for.
	www.health-focus.biz /healthy/protein/lowry-protein/index.html (314 words)

	The Lowry Assay
		The proteins in the samples are precipitated by a mixture of sodium deoxycholate and trichloroacetic acid and centrifugation prior to assay.
		The assay is relatively sensitive, but takes more time than other assays and is susceptible to many interfering compounds.
		The Lowry assay is sensitive to variations in the content of tyrosine and tryptophan residues.
	www-class.unl.edu /biochem/protein_assay/lowry_assay.htm (687 words)

	TP0300 Total Protein Kit Micro Lowry Petersons Modification null
		Peterson, G.L., et.al., A simplification of the protein assay method of Lowry et al.
		Bensadoun, A., Weinstein, D., Assay of proteins in the presence of interfering materials.
		Lowry, O.H., et.al., Protein measurement with the Folin phenol reagent
	www.sigmaaldrich.com /catalog/search/ProductDetail?ProdNo=TP0300&Brand=SIGMA (148 words)

	Bradford Protein Assay (Site not responding. Last check: 2007-10-20)
		Biuret, Lowry (1956) and Bradford (1976) are the most popular tests (assays) for estimating total protein content of a mixture.
		Pierce and Sigma also market reagent for the Bradford protein assay; however, the Bio-Rad reagent generates colors of blue that are easier to discern with our eyes alone.
		Dr. Toby has been using the Bradford Protein Assay for her research since it was published in Analytical Biochemistry in 1976 and has been teaching high school students the protein assay using the Bio-Rad reagent since 1985.
	www.carnegieinstitution.org /first_light_case/horn/PROTsite/bradford.html (249 words)

	Protein Quantitation: Your source for Bradford reagents and Bicinchoninic Acid assay
		As a traditional technique, protein quantitation is a field that Sigma has long supported with excellence.
		Protein quantitation may be accomplished through a number of methods, the most reliable of which include the BCA (bicinchoninic acid) assay and the Bradford assay.
		Alternative protein quantitation methods include the Lowry assay for protein quantitation and derivitization of N-terminal amines.
	www.sigmaaldrich.com /Area_of_Interest/Life_Science/Proteomics_and_Protein_Expr_/Protein_Analysis/Protein_Quantitation.html (132 words)

	[No title]
		The cassette was placed in a transfer module with the fl side facing the fl side (cathode) of the module so that when running electric current, the separated proteins that are negatively charged in the gel would slowly transfer to the membrane.
		The shifts of the absorbance values might result from pipette error and the high sensitivity of Lowry method to the protein change in seminal plasma.
		Table 1 Absorbance values of seminal plasma Well #101112A (200X)0.2200.1560.159B (100X)0.2890.2070.197 To measure concentration of protein in seminal plasma using Lowry method, the absorbance values of diluted samples is calculated by using the equation obtained from the standard curve of bovine serum albumin (BSA) concentration.
	students.washington.edu /patkub/MICR499/report.doc (1175 words)

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