• How do I determine the concentration, yield and purity of a

    Concentration (µg/ml) = (A 260 reading – A 320 reading) × dilution factor × 50µg/ml Total yield is obtained by multiplying the DNA concentration by the final total purified sample volume. DNA yield (µg) = DNA concentration × total sample volume (ml) However, DNA is not the only molecule that can absorb UV light at 260nm.

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  • Gini coefficient

    In economics, the Gini coefficient (/ ˈ dʒ iː n i / JEEnee), also known as the Gini index or Gini ratio, is a measure of statistical dispersion intended to represent the income inequality or the wealth inequality within a nation or a social group. The Gini coefficient was developed by the statistician and sociologist Corrado Gini.. The Gini coefficient measures the inequality among .

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  • Droplet Size

    To meet a target droplet size of μm, the atomization model can be used to backcalculate the necessary airflow rates, assuming a 1:1 volumetric ratio, with inputs given in Table, Example 23. With this spray nozzle, the airflow rates must be reduced to m 3 /s to reach the target drop size of μm.

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  • Safety factor: How do I calculate that?

     · The definition of the safety factor is simple. It is defined as the ratio between the strength of the material and the maximum stress in the part. When the stress in a specific position becomes superior to the strength of the material, the safety factor ratio becomes inferior to 1, this when there is danger

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  • 5 ways to reduce the size of a PDF

     · If your file is still very large after you've created it electronically, rather than by scanning, there are still some steps you can take. The simplest is to resave your file as a reducedsize PDF. In the latest version of Adobe Acrobat, open the PDF you wish to resave as a smaller file, choose File, Save as Other, and then Reduced Size PDF.

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  • 4 Easy Ways to Determine Gear Ratio (with Pictures)

     · 4. Divide one teeth count by the other. Now that you know how many teeth are on each gear, you can find the gear ratio relatively simply. Divide the driven gear teeth by the drive gear teeth. Depending on your assignment, you may write your answer as a decimal, a fraction, or in ratio form (, x : y ).

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  • How to Calculate Percent Error

     · You measure the dimensions of the block and its displacement in a container of a known volume of water. You calculate the density of the block of aluminum to be g/cm 3 . You look up the density of a block of aluminum at room temperature and find it to be g/cm 3 .

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  • WORKERS' COMPENSATION EXPERIENCE MODIFICATION: THE .

    To calculate an experience modifiion, rating bureaus use actual loss history from the three years prior to the expiring term. For example, to calculate a 2022 experience modifiion, claims data from,, and would be used.

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  • Diameter Calculator: Compute Dimensions of a Circle

    a = pi (d/2)^2 a = π(d/2)2 Using the Diameter Calculator You can enter the diameter and then compute radius and circumference in mils, inches, feet, yards, miles, millimeters, centimeters, meters and kilometers.

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  • How to Use a Single and Double Pulley System | Sciencing

     · Attach the rope first to the bottom of the upper fixed pulley, then loop the rope down through the wheel on the moveable lower pulley. Now, loop the rope back up through the top fixed pulley. Make sure the rope is fully seated into the grooves on the pulley wheels. Proceed to lift the weight by applying downward or lateral pressure on the rope.

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  • Poisson's Ratio: Numerical problems with solutions

     · Calculate the decrease in diameter of the wire. Given: Original length of wire = L = 3 m, Diameter of wire = D = cm = × 10 2 m = 1 × 10 3 m, Radius of wire = r = /2 = cm = × 10 2 m = 5 × 10 4 m,, Stretching load = 10 kg = 10 x N, Young's modulus of elasticity = Y = 20 × 10 10 N/m², and Poisson's ratio = σ =

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  • DebttoGDP Ratio

     · Consider four hypothetical countries with their corresponding national debt and gross domestic product for the year 2020: The debttoGDP can be calculated for each country with the formula provided above. The ratio for each country is as follows: Country A: 20 / 10 = %. Country B: 5 / 7 = %. Country C: 125 / 180 = %.

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  • Speed Reducer, Gear Drive, Variable Speed Drives | Boston Gear

     · Boston Gear offers the industry's largest line up of reliable speed reducers, gearing and other quality drivetrain components. With well over a century of frontline experience, Boston Gear is recognized globally as a premier resource for extremely reliable, highperformance power transmission components. Boston Gear offers the industry's ...

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  • Motor Sizing Basics Part 2: How to Calculate Load Inertia

    Theoretically, inertia is a factor of mass so it should not include gravity, however, practically we can not easily measure mass on the earth. Oriental Motor commonly provides inertia in ozin². Then, when we calculate the acceleration torque, we divide the total inertia by gravity. Gravity = 386 in/sec² ozin² = Inertia based on weight

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  • Assessing the vulnerability of traditional maize seed systems in Mexico .

     · Climate change is predicted to have major impacts on smallscale farmers in the developing world, but these impacts are likely be complex, locally specific, and hard to predict ().Mexico and Central America is considered to be a region at significant risk from climate change ().Maize is the most important crop cultivated in Mexico, being central to the diets of both .

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  • How to Calculate Conduit Fill

    Guidance is also provided below on how to calculate conduit fill. Other codes, standards or practices may dictate other maximum fill ratios, but the methodology remains the same. Conduit Maximum Occupancy Recommended Minimum Radius of Bends Conduit Trade Size Designator¹ English (Metric) Internal Diameter in (mm) CrossSectional Area in² (mm²)

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  • Reform of Quota and Voice in the International Monetary Fund

    This reduces the dispersion of calculated quotas, moderating to some extent the role of size in the formula. 1 Communiqué of the International Monetary and Financial Committee of the Board of Governors of the International Monetary Fund (PR/07/71, April 14, 2007 and PR/07/236, October 20, 2007). See also Report of

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  • WindowtoWall Ratio : Asset Score Help Desk

     · Select a Block or Block Surface to create or edit a Windows layout Select a Window layout from the pulldown menu Enter the Number of windows (for Discrete layout) and associated window dimensions, or a WindowtoWall Ratio (for a Continuous layout). Energy Asset Score Inputs for Advanced Window Layout:

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