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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3-D Optical Memory Storage In Bacteriorhodopsin ➢ Abstract With the growth of Information over last few decades‚ demands for its efficient storage and faster processing has reached new dimensions. The need of the hour seems to be development of high capacity secondary storage devices as well as faster processors. The RAM used in most computers is the same type of memory used several years ago. The limit of increasing the density of RAM has already
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require very much energy in order to make the cyclohexene ring and the result can create four stereo centers‚ making it compatible for a variety of functional groups which still has double bonds in the products. Dimethyl Tetraphenylphthalate. Tetraphenylcyclopentadienone (0.100g)‚ dimethyl acetylene-dicarboxylate (0.1mL)‚ and nitrobenzene (1mL) was placed into a reaction tube with a boiling stick. The reaction was heated until the purple solution turns tan and refluxed. Ethanol(3mL) was stirred in
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Acetone‚ MEK and Methyl Isobutyl Ketone‚ May 1972 Report No. 77 ACETONE‚ METHYL ETHYL KETONE AND METHYL ISOBUTYL KETONE by SHIGEYOSHI TAKAOKA May 1972 A private report by the PROCESS STANFORD ECONOMICS RESEARCH INSTITUTE PROGRAM I MENLO I PARK‚ CALIFORNIA Acetone‚ MEK and Methyl Isobutyl Ketone‚ May 1972 CONTENTS a 1 INTRODUCTION. . . . . . . . . . . . . . . . . . . . . . . . 1 2 SUMMARY 3 3 4 5 . . . . . . . . . . . . . . . . . . . . . . . . . . Acetone .............
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A correct IUPAC name for the following compound is: A) 3‚6‚7-trimethyl-4-bromo-1-octene B) 4-bromo-3-methyl-6-isopropyl-1-heptene C) 4-bromo-3‚6‚7-trimethyl-1-octene D) 4-bromo-6-isopropyl-3-methyl-1-heptene E) 4-bromo-6-isopropyl-3‚6-dimethyl-1-hexene *5. Which alkene would yield 3-methylpentane when subjected to catalytic hydrogenation? A) B) C) D) E) *61.What product is formed on reaction of hydrogen chloride with 1-pentene? 1
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don’t have any bonds either. b) The Lewis dot structure doesn’t follow the octet rule‚ have the correct number of electrons‚ or any bonds. 74) Ethyl alcohol and dimethyl ether each have to same molecular formula‚ C2H6O. Ethyl alcohol has a much higher boiling point (78°C) than dimethyl ether (-25°C). Propose an explanation for this difference. Ether molecules cannot form hydrogen bonds with each other and therefor result in a much lower boiling point than alcohols.
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compiled about these unknowns by obtaining experimental melting/boiling point ranges‚ and analyzing IR and proton/carbon NMR spectrums It was determined that the unknown solid’s identity was m-nitrobenzoic acid and the unknown liquid’s identity was 4‚4-dimethyl-2-pentanone. The calculated percent recovery for the purified crystals was 20.75% INTRODUCTION: 2 The goal of this lab was to isolate two unknowns‚ one solid and one liquid‚ from an ethereal solution using chemically active‚ or acid-base‚ extraction
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D were 1641.69 cm-1 (Amide)‚ 1126.43 cm-1 (C-N bond)‚ and 1384.20 cm-1 (C-N bond). Using the functional groups and the melting and boiling point of each unknown a list of possible identities was generated. The identity of unknown liquid D was 2‚6 dimethyl pyridine‚ and the identity of unknown solid D was benzophenone. Introduction Chemically active extraction can be used to separate compounds of similar polarities by changing the polarity of one of the compounds in a mixture in order to extract
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(2-methylpropanal‚ 2-methylbutanal‚ 2-ethylpyridine and dimethyl trisulfide) using GCO-aroma extract dilution
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Dimerization unit converts olefins into higher-octane gasoline blending components. For example‚ butenes can be dimerized into isooctene which may subsequently be hydrogenated to form isooctane. There are also other uses for dimerization. • Isomerization unit converts linear molecules to
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