Moderne Methoden Der Pflanzenanalyse
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Moderne Methoden Der Pflanzenanalyse Modern Methods Of Plant Analysis
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Author : K. Paech
language : de
Publisher: Springer Science & Business Media
Release Date : 2012-12-06
Moderne Methoden Der Pflanzenanalyse Modern Methods Of Plant Analysis written by K. Paech and has been published by Springer Science & Business Media this book supported file pdf, txt, epub, kindle and other format this book has been release on 2012-12-06 with Science categories.
If, following the solvent extraction of a hydrocarbon from a plant, it is not known whether it is one or the other, a method of distinguishing the two is described by HENDRICKS, WILDMAN and JONES (1946). The technique involves the infra-red absorption spectra of the two isomers. At about 12 mp. the relative absorption coefficient of rubber is 42% greater than for gutta. ScHLESINGER and LEPER (1951) describe two procedures for separation of the rubber and gutta hydrocarbons from large quantities of crude chicle. In one, the chicle is extracted with benzene which dissolves both isomers. An excess absolute ethyl acetate is added and the mixture stored at 5° C overnight. The gutta precipitates out and the rubber remains in solution. The other method is as follows: (1) Ten grams of chicle are extracted with acetone for 24 hours in a Soxhlet extraction apparatus. (2) The insoluble material in the thimble is allowed to .. it dry, then immersed in 150 ml. of cold Skellysolve B in a refrigerator at 10° C and· allowed to stand for 48 hours with occasional agitation. (3) The thimble is then removed from the solvent and the enclosed residue washed several times with fresh, cold Skellysolve B. (4) An excess of acetone and a few drops of a concentrated aqueous solution of sodium iodide are added to the combined Skellysolve B extract and washings and allowed to stand overnight in a refrigerator.
Modern Methods Of Plant Analysis Moderne Methoden Der Pflanzenanalyse
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Author : K. Biemann
language : de
Publisher: Springer Science & Business Media
Release Date : 2012-12-06
Modern Methods Of Plant Analysis Moderne Methoden Der Pflanzenanalyse written by K. Biemann and has been published by Springer Science & Business Media this book supported file pdf, txt, epub, kindle and other format this book has been release on 2012-12-06 with Science categories.
123 phase and hence have no direct bearing on the retention time of solutes. However in gas-solid chromatography, a considerable quantity of the mobile phase may be adsorbed on the surface of the stationary adsorbent which diminishes the column's effective length and ability to retain solutes. In this respect helium has been found to be preferable to most other gases (GREENE and Roy, 1957) because it is adsorbed to the least extent. 3. Packed columns offer a considerable resistance to flow, which may create a pressure differential between inlet and outlet of sufficient magnitude to cause an unfavorable flow rate through a significant length of the column. A reduced inlet/outlet pressure ratio can be obtained by using light molecular weight gases toward which the column packing shows the greatest permeability. The flow rate of the mobile phase is normally adjusted by altering the column inlet pressure, for which purpose commercial pressure regulators of sufficient accuracy are available. Quantitative measurements of the flow rate can be made by a number of methods, including rotameters, orifice meters, soapfilm flow meters and displacement of water. The former two methods are the most con venient but the least accurate; moreover they create a back pressure and are temperature dependent whereas although the moving soap bubble is cumbersome to employ and unusable for continuous readings, it is preferred when the highest accuracy is required.
Modern Methods Of Plant Analysis Moderne Methoden Der Pflanzenanalyse
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Author : H. F. Linskens
language : de
Publisher: Springer-Verlag
Release Date : 2013-03-13
Modern Methods Of Plant Analysis Moderne Methoden Der Pflanzenanalyse written by H. F. Linskens and has been published by Springer-Verlag this book supported file pdf, txt, epub, kindle and other format this book has been release on 2013-03-13 with Science categories.
Modern Methods Of Plant Analysis
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Author : B.D. Sanwal
language : de
Publisher:
Release Date : 1963
Modern Methods Of Plant Analysis written by B.D. Sanwal and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1963 with categories.
Modern Methods Of Plant Analysis Moderne Methoden Der Pflanzenanalyse
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Author : K. Paech
language : de
Publisher: Springer Science & Business Media
Release Date : 2012-12-06
Modern Methods Of Plant Analysis Moderne Methoden Der Pflanzenanalyse written by K. Paech and has been published by Springer Science & Business Media this book supported file pdf, txt, epub, kindle and other format this book has been release on 2012-12-06 with Science categories.
Modern Methods Of Plant Analysis Moderne Methoden Der Pflanzenanalyse
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FREE 30 Days
Author : K. Paech
language : de
Publisher: Springer Science & Business Media
Release Date : 2013-11-11
Modern Methods Of Plant Analysis Moderne Methoden Der Pflanzenanalyse written by K. Paech and has been published by Springer Science & Business Media this book supported file pdf, txt, epub, kindle and other format this book has been release on 2013-11-11 with Science categories.
Modern Methods Of Plant Analysis
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Author :
language : de
Publisher:
Release Date : 1955
Modern Methods Of Plant Analysis written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1955 with Botanical chemistry categories.
Modern Methods Of Plant Analysis Moderne Methoden Der Pflanzenanalyse
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Author :
language : de
Publisher: Springer Science & Business Media
Release Date : 2012-12-06
Modern Methods Of Plant Analysis Moderne Methoden Der Pflanzenanalyse written by and has been published by Springer Science & Business Media this book supported file pdf, txt, epub, kindle and other format this book has been release on 2012-12-06 with Science categories.
Modern Methods Of Plant Analysis
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FREE 30 Days
Author : Karl Paech
language : de
Publisher:
Release Date : 1955
Modern Methods Of Plant Analysis written by Karl Paech and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1955 with categories.
Modern Methods Of Plant Analysis Moderne Methoden Der Pflanzenanalyse
DOWNLOAD
FREE 30 Days
Author : K. Paech
language : de
Publisher: Springer Science & Business Media
Release Date : 2013-11-11
Modern Methods Of Plant Analysis Moderne Methoden Der Pflanzenanalyse written by K. Paech and has been published by Springer Science & Business Media this book supported file pdf, txt, epub, kindle and other format this book has been release on 2013-11-11 with Science categories.