Experiment 2 Quantification of Proteins in Solution by Spectrophotometer Lab bench# 1 Introduction: Absorption spectroscopy is a common method for finding the concentration of proteins or protein complexes in a solution. Proteins absorb light at specific wavelengths and can be defined by the equation A = log (Io/I). This equation states that an absorbance at a specific wavelength‚ A is equal to the log of the ratio of incident light intensity (Io)‚ to transmitted light intensity (I). A
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EXPERIMENT : Iron in Breakfast Cereal by Atomic Absorption Spectroscopy OBJECTIVES : 1) To determine the actual iron content of different brands of cereals 2) To compare the experimental results with the values listed on the manufacturer’s labels. INTRODUCTION : Iron is one of the important minerals that is required for our bodies to function properly. Most of the iron in our body is found in the blood such as haemoglobin‚ approximately 60 -70% of the human body’s iron is found
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there was a significant difference in the amount of oil absorbed by applying groups of samples containing chicken feathers and human hair under the different absorption time. The second objective was to determine whether there is a significant difference in the amount of oil absorbed by the chicken feathers and hair in terms of absorption time. It was found out that there is a significant difference in the amount of oil absorbed by the two groups of samples under the same oil-to-water concentration
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Callam 1/8 CHEM – 254 – WI -2009 Problem Set #1 – IR Spectroscopy - KEY 1. Which of the indicated bonds absorbs at the higher frequency in an IR spectrum? a. O or OH C=O > C-O b. N or NH C=N > C-N c. H or H C-H sp2 > C-H sp3 Callam 2/8 CHEM – 254 – WI -2009 2. What major IR absorptions are present above 1500 cm-1 for each compound? a. b. O sp3 C-H stretch 2950 C=O - ketone 1715 cm-1 cm-1 c. O sp3 C-H stretch 2950 cm-1 sp3 C-H stretch 2950 cm-1
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Abstract Pigments extracted from different greens have different polarities and may be different colors. Mixed pigments can be separated using chromatography paper. Chromatography paper is able to separate mixed pigments due to their polarity and solubility. Pigments of chlorophyll a‚ chlorophyll b and beta carotene will be separated on chromatography paper because each has its own polarity and solubility‚ which results in different distance traveled up the paper. Beta carotene is non-polar so it
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brain development. Maria Montessori referred this important phase of development as the “absorbent mind”. During this period the brain receives processes and stores everything from the environment without any effort‚ this form absorption is called the unconscious absorption. Silvana Q Moantanaro‚ M.D.‚ says in her book “This intense mental activity is always going on‚ even in prenatal life‚ and it characterizes”the absorbent mind”. ” Understanding the Human Being‚ Pg.83 From birth a child absorbs
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1. What physical evidence did you find at the victim’s home? I found a wallet‚ possible flammable liquid‚ beer bottles. 2. Describe the process that you used to take a sample of the puddle-shaped burn pattern on the floor. Why did you also take samples from the portion of the floor that was not burned? I scraped up the material from the puddle-shaped burn‚ and then used tweezers to store it. I took samples from the portion of the floor that wasn’t burned to compare it to the puddle-shaped burn
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Study Guide: Exam 1 1. What type(s) of molecular motion is (are) observed using infrared spectroscopy? A. Stretching and bending B. Rotation and excitation C. Spin flipping D. Fragmentation 2. The functional group region of an infrared spectrum is A. where the cations appear. B. >1500 cm-1. C. <1500 cm-1. D. >2500 cm-1. 3. Stronger bonds will be found where in the infrared spectrum? A. Higher molecular weight B. Lower molecular weight C. Lower wavenumbers D. Higher wavenumbers 4. Compared
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Victor Lee CHEM 113 4/5/2013 The Spectroscopy of Interstellar Anions Dr. Ryan Fortenberry presented about one of the greatest mysteries in spectroscopy‚ which involved these diffuse interstellar bands spectra of space. No one has been able to conclusively determine these specific bands‚ but after thought‚ Fortenberry speculated that these could potentially be absorption bands of anions due to various other observations from previous reports about these findings. Fortenberry ran calculations
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ABSORBENT MIND ESSAY Dr Montessori discovered that the child possess a mind which is totally different from that of an adult. The child absorbs all that is found around him‚ very much identical to the process of osmosis. A key word before further development about the absorbent mind would be adaptation. Adaptation might be considered as the trigger point. Why ? From his birth‚ in order to survive and to fulfil his role‚ the infant is adapting himself to the environment. He was
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