2.4.4. Direct determination of saliva proteins Protein contaminated with nucleic acids absorbed the light at wavelength 280 nm and it absorbs much strongly at wavelength 205 nm when it is free from nucleic acids. The UV-visible spectrophotometer was used in determination of saliva proteins (Figure 2.2). Cold trichloroacetic acid (10 % w/v ) was added to the sample‚ centrifuged for 10 minutes to precipitate protein. The absorbance of a known volume
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STATISTICS TEST Length: 1090 words (3.1 double-spaced pages) Rating: Red (FREE) - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - Statistics are necessary for scientific research because they allow the researchers to analyze empirical data needed to interpret the findings and draw conclusions based on the results of the research. According to Portney and Watkins (2009)‚ all studies require a description of subjects and responses that are obtained through measuring central tendency
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Lab 1: Determining the pK a of PNP PNP or paranitrophenol is an organic compound that undergoes changes when the pH is manipulated of the solution. PNP is also an acid/ base indicator. The compounded starts off as internal conjugated ring with the hydroxyl group and the nitro group single bonded to the aromatic ring. This occurs at the pH of 5. At this point the aromatic compound is colorless and is in the ultraviolet range. However‚ as the pH begins to increase the hydroxyl group deprotonates
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Alana Rogers Date of experiment:11-20-13 Date submitted: 11-23-13 Determination of Water Hardness Using a Titrator Purpose: This purpose of this experiment was to determine the hardness of the local water supply. Be familiar with using a titrator. To tell wether your water is hard or soft. Hard water however does not create a threat‚ but is bad for your pipes causing them to crust. To measure water’s “softness” you are truly measuring the amount of CaCO3 in the water. Procedure: Assemble
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Lab 1 – Measurement of Space and Time Anthony Lucci Lab Partner: Amy Hayes Question 4: Both the height and diameter of the cylinder were taken to find the volume; five times for both measurements. Vernier calipers were used to get these measurements by clamping the cylinder between the jaws of the calipers. By looking at the mark of the zero‚ in relation to the main scale‚ the line best lined up with a line from the main scale was taken down. Getting
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relationship among the bond angles for one central atom and four peripheral atoms (labeled 1 through 4) expressed by the following determinant. This constraint removes one degree of freedom from the choices of (originally) six free bond angles to leave only five choices of bond angles. (Note that the angles ‚ ‚ ‚ and are always zero.) The surface area of a sphere is: Archimedes first derived this formula[citation needed] from the fact that the projection to the lateral surface of a circumscribed cylinder
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ΔT1 = Kfm where Kf is a constant that depends on the specific solvent and m is the molality of the molecules or ions solute. Table 1 gives data for several common solvents. Table 1. Molal Freezing Point and Boiling Point Constants | Solvent | Formula | Freezing Point (°C) | Kf(°C/molal) | Boiling Point (°C) | Kb(°C/molal) | Water | H2O | 0.0 | 1.86 | 100.0 | 0.51 | Acetic acid | CH3COOH | 17.0 | 3.90 | 118.1 | 3.07 | Benzene | C6H6 | 5.5 | 4.90 | 80.2 | 2.53 | Chloroform | CHCl3 | –63
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Bio Lab 1 Scientific Method Introduction The scientific method in action‚ designing and Performancing and experiment does thumb diameter‚ length or write diameter’s have an effect on the overall chance of winning a thumb wrestling match? In this investigation‚ we will develop a hypothesis based on physical data collected and test the hypothesis. Material Thumb‚ Ruler‚ Metric ruler Procedure 1. Measure the circumference of the thumb‚ in centimeters‚ at its widest point. Record this data in
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GMAT Practice Questions | GMAT Study Guide | MBA Admissions GMAT Formulas Algebra Formulas Exponential Equations xnxm = xn + m (xn)/(xm) = x n - m (x/y)n = (xn)/(yn) xnyn = (xy)n (xy)z = xyz x-n = 1/(xn) 1n = 1 x0 = 1 0n = 0‚ except 00 = 1 FV = CV(1 + g)T Other Distance = Rate*Time Wage = Rate*Time Arithmetic Formulas Combinatorics Combinations:nCk = n!/((n-k)k!)! Permutations:nPk = n!/(n-k)! Circular: (n-1)! k = number of objects selected from a pile of n objects n = total
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Average formula: Let a1‚a2‚a3‚......‚an be a set of numbers‚ average = (a1 + a2 + a3‚+......+ an)/n Fractions formulas: Converting a mixed number to an improper fraction: Converting an improper fraction to a mixed number: Formula for a proportion: In a proportion‚ the product of the extremes (ad) equal the product of the means(bc)‚ Thus‚ ad = bc Percent: Percent to fraction: x% = x/100 Percentage formula: Rate/100
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