iIsolation of Chlorophylls and Beta Carotene from Plant Leaves Wang Haina A0133901R 1. Aim 1. To isolate chlorophyll and beta carotene from plant leaves using column chromatography. 2. To qualitatively characterise the pigments with UV-vis spectroscopy and TLC. 2. Results and discussion Isolation of beta carotene and chlorophylls by column chromatography Upon the loading of S1 (the extract of the plant leaves in hexane)‚ a yellow band appeared at the top part of the silica column immediately
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INTRODUCTION: The electromagnetic spectrum is the range of all possible frequencies of electromagnetic radiation. Radiation can be said to be energy that travels and spread as it goes. The "electromagnetic spectrum" of an object has a different meaning‚ and is instead the characteristic distribution of electromagnetic radiation emitted or absorbed by that particular object. We tend to witness different radiations of the electromagnetic spectrum without knowing‚ example is the visible light that
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Three-Dimensional Structure of Proteins Rotation around the -Carbon in a Polypeptide A Sterically Nonallowed Conformation The Helix and Pleated Sheet Conformationally allowable structures where backbone is optimally Hbonded (linear Hbonds). Helix (3.613 Helix): •3.6 residues/turn •Rise = 0.15 nm/ residue •13-atom hydrogenbonded loop Linus Pauling and Robert Corey‚ 1950 Pleated Sheet: •Anti-parallel or parallel •2.0 residues/”turn” •0.34 nm/residue (anti-parallel) or 0.32 nm/residue
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INSTRUMENTATION LECTURER – MRS. TRICIA JONES LAB 1 TITLE: Organic Compound Identification Using Infrared Spectroscopy Aim: To identify the functional groups in organic compounds using infrared spectra. APPARATUS AND REAGENTS: Nicolet 380FTIR‚ HATR Accessory (liquid crystal plates) Reagents ( Methanol‚ Benzene and Cyclohexane‚ Cyclohexene) THEORY: An important tool of the organic chemist is Infrared Spectroscopy‚ or "IR". IR spectra are acquired on a special instrument‚ called an IR spectrometer. IR is used
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Name Lab Section GTA Station 1. Grignard Reaction Post-lab report Fill out the appropriate sections below. Show all work. Your calculated answers need to match the answers in the table. Also‚ attach the benzophenone and product spectra. Indicate appropriate stretches including differences in both spectra. Results | | Amounts and units | |Initial
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Identify each unknown from Part One of the lab and briefly explain why you identified each unknown as you did. Unknown substance One is Yellow and Unknown substance two is Blue. They gave off the same hues as sodium and potassium. Part Two (Spectroscopy): Create and complete a data table for Part Two of the lab. It should include the name of the element‚ the colors‚ and the wavelength values of the observed lines. Spectrum Line Hydrogen Helium Sodium Neon
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mass‚ isotopes presence) c. Symbols for representing isotopes (hyphenation notation and nuclear notation d. Average atomic mass – meaning and calculation e. Flame test experiment and deductions f. Atomic spectra and energy quantization g. Spectroscopy and difference between absorption and emission spectrum h. Paramagnetism 12. Electrons are responsible for forming molecules 13. The seven types of radiations 14. Electromagnetic radiation a. definition and concept of polarization 15. Wavelength
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an overview of the recent research on the fundamental and applied properties of nanoparticles extracted from cellulose‚ the most abundant polymer on the planet and an essential renewable resource. Given the rapid advancements in the field and the high level of interest within the scientific and industrial communities‚ pioneered the use of cellulose nanoparticles (cellulose nanocrystals or whiskers and cellulose microfibrils) in nanocomposite applications. in the life sciences and bio-based applications
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A functional near-infrared spectroscopy (fNIRS) conducted by Bigliassi‚ León-Dominguez‚ and Altimari. This study was conducted in a laboratory. Thirty subjects participated in the study: 15 men and 15 women. The aim of the study was to explore the effects of techno and classical music
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3/22/2012 ARYL HALIDES 2. displacement reactions of diazonium salts ARYL HALIDES General formula: Ar–X where X = F‚ Cl‚ Br or I Examples Structure: C-X bonds are shorter and stronger Bond C-Cl C-Br Ar-X 1.69 A° 1.86 A° R-X 1.77 1.91 Dipole moments are unusually small. Bond C-Cl Preparation: 1. electrophilic aromatic substitution – useful only if one product is obtained C-Br Ar-X 1.7 D 1.7 D R-X 2.10 D 2.15 D Dipole moments may cancel out depending on the geometry of the
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