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Chemistry

Compact course reaction technology

Calculation of the conversions for the ester saponification in different reactors The saponification of ethyl acetate (E) is constant in volume and proceeds without side reactions according to the following equation: CH3COOC2H5 + OH- → CH3COO- + C2H5OH The reverse reaction can be neglected under the given conditions. The saponification then follows the rate law: −dcEdt = k⋅cE⋅cOH − conversion calculation The focus of the consideration is the conversion determination (theoretical and experimental) for the four reactor types.
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Chemistry

Structural analysis

Overview page with a recommended order of the learning units in the subject area & 34; Structural Analysis & 34; For the study of biochemical working methods. Structural analysis of proteins 30 min. For the elucidation of the protein structure, especially its three-dimensional structure in space, two experimental methods are decisive: 1.
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Chemistry

Aromatic reactions - Ar-SE - basics and theory

Mechanism of electrophilic substitution on aromatic systems (Ar-SE) Addition-Elimination Mechanism Electrophilic substitution on aromatics takes place mechanistically through a multi-step process. This consists of addition of the electrophile to form a high-energy carbocation and subsequent rearomatization by splitting off a proton.
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Chemistry

3D illustration of trimeric hemagglutinin

Mouse Fig. 1 ThePDB data set for this chime originates from the RCSBProteinDataBank; ID: 1HGG.Berman, HM, Westbrook, J., Feng, Z., Gilliland, G., Bhat, TN, Weissig, H., Shindyalov, IN, Bourne, PE (2000) TheProteinDataBank, NucleicAcidsResearch 28,235-242.RCSBProteinDataBank (http://www.rcsb.org).
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Chemistry

Elements of the periodic table

Ag (silver) Table 1Silver Name of the element: SilverLatin name: ArgentumEnglish name: SilverFrench name: ArgentSymbol: AgOrder number: 47Condition at 25 ° C: solid, metalFrequency (in ppm): 0.07Detected by: approx. 3000 BC Electron configuration: Kr 4d105s1 Oxidation states: +1, + 2 Relative atomic mass: 107.
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Chemistry

Membrane proteins

Thermodynamic Aspects of Membrane Proteins The insertion of charged or strongly polar amino acids into a lipid bilayer is thermodynamically unfavorable. This has consequences for the structure of integral membrane proteins: the side chains of transmembrane segments are mostly non-polar (Ala, Val, Leu, Ile or Phe) the strongly polar groups of the amino acids (in the peptide backbone) have to form hydrogen bridges in order to reduce the energy costs for the insertion of the protein into the membrane to be kept as low as possible.
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