L angmuir 1995‚11‚ 2344-2347 2344 Coating Polystyrene Particles by Adsorption of Hydrophobically Modified Dextran C . Fournier‚ M. Leonard‚* I. Le Coq-Leonard‚ and E . Dellacherie L CPM‚ URA C NRS 494‚ ENSIC B.P. 4 51‚ 54001 Nancy‚ France Received March 14‚ 1995. I n Final Form: May 22‚ 1995@ I n order to decrease their hydrophobicity and thus t o reduce the protein adsorption at their surface‚ polystyrene-divinylbenzene (PS-DVB) particles have been coated with dextran. To favor its adsorption
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FACTORS AFFECTING THE LYTIC ACTIVITY OF LYSOZYME ’ A. N. SMOLELIS" AND S. E. HARTSELL Laboratories of Bacteriology‚ Department of Biological Sciences‚ Purdue Univer8ity‚ Lafayette‚ Indiana Received for publication October 28‚ 1951 Since the initial discovery of lysozyme by Fleming (1922)‚ nuimerous attempts have been made to describe the properties of this enzyme. The absence of a reliable method for the determination of enzymatic activity‚ however‚ has contributed to the incompleteness and
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plants (Raphanus sativus)‚ by implementing varying pH levels of buffer solution into the soil. We have allotted a total of four days (Tuesday‚ April 10‚ 2012- Friday April 13‚ 2012) to examine the effects of acid rain. Purpose: To investigate the effect of implementing buffer solutions of varying pH levels in soil on the growth in height of radish plants (Raphanus sativus). Independent Variable: The varying levels of pH of buffer solutions placed into the plants’ soil Dependent Variable: The height
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PH: I will make sure that the pH is stable (constant) and only the temperature varies this is to be done by using buffer in every test tube so as to maintain pH balance for each beetroot sample and insure that pH does not become a variable. PH is important for maintaining the integrity of the cell membrane as integral proteins can denature upon change in pH. Also‚ presumably the buffer will have the right concentrations of salt or electrolyte’s (ion such as Na‚ K‚ Ca‚
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question “whose DNA was left behind?”. Materials: * Transfer pipets * Agarose Gel * Dyed DNA samples * Electrophoresis Buffer * Electrophoresis Chamber * Casting Tray * Dams * Comb * Power Supply * Heat Source * 500 ml Beaker or Flask * Distilled Water (used to make buffer solutions) Procedure: 1. After all of the required materials are received‚ rubber dams must close off the ends of the casting tray. 2. A comb is
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and heating the solution to boiling point. Upon reaching just below boiling point‚ decolorizing carbon was added to the solution‚ and the solution was allowed cooled for 2-3 minutes. The dark black solution was filtered through a gravity filtration system‚ leaving dark residue behind on the filter paper‚ and colorless to slightly pink liquid in the beaker. Then‚ 9 mL of sodium acetate buffer‚ to maintain a relatively constant pH and 1.8 mL of acetic anhydride were added to the solution‚ and then it
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4-Dihydroxyphenylalanine CONDITIONS: METHOD: REAGENTS: A. 50 mM Potassium Phosphate Buffer‚ pH 6.5 at 25° C (Prepare 50 ml in deionized water using Potassium Phosphate‚ Monobasic‚ Anhydrous‚ Sigma Prod. No. P5379. Adjust to pH 6.5 at 25° C with 1 M KOH.) 1 mM L-Tyrosine Solution (Prepare 100 ml in deionized water using L-Tyrosine‚ Free Base‚ Sigma Prod. No. T-3754.) Tyrosinase Enzyme Solution (Immediately before use‚ prepare a solution containing 500 - 1‚000 units/ml of Tyrosinase in cold Reagent A.) T = 25°
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chloride hydrate (MW 371.81 Da)‚ poly vinyl alcohol (MW 89‚000 Da) and 15 and 50 mL Corning centrifuge tubes were purchased from Aldrich (St. Louis‚ MO‚ USA). Acetone was purchased from Fischer Scientific Laboratory (Fair Lawn‚ NJ‚ USA). Phosphate buffer pH 7.0 was purchased from EMD Chemicals Inc. (Gibbstown‚ NJ‚ USA). 0.2 micron syringe filters were obtained from Millipore Corporation (Carrigtwohill‚ Ireland). 1.1. Collection and preparation of crude methanolic plant extract (CMPE) of Callistemon
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5 Solution Preparation 1. Why should the solutions be prepared with 0.10M HCl used as solvent? a. What will happen to Fe3+ if the solution was not prepared using 0.10M HCl? b. Give the balanced equation for the 1st hydrolysis of Fe3+. c. What is the color of the product of 1st hydrolysis of Fe3+? d. What is the effect of the product of 1st hydrolysis to the absorbance of the solution? Determination of Analytical Wavelength 2. Why should the solution with
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