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  • 1
    Online Resource
    Online Resource
    San Diego :Elsevier Science & Technology,
    Keywords: Cyanogen compounds -- Analysis. ; Electronic books.
    Type of Medium: Online Resource
    Pages: 1 online resource (153 pages)
    Edition: 1st ed.
    ISBN: 9781483278612
    Language: English
    Note: Front Cover -- Analytical Methods for Organic Cyano Groups -- Copyright Page -- Table of Contents -- PREFACE -- CHAPTER 1. INTRODUCTION -- References -- PART A: CHEMICAL METHODS -- GENERAL INTRODUCTION -- CHAPTER 2. REACTIONS OF (ADDITION TO) THE CYANO GROUP -- Introduction -- 1. Reduction: -CN-CH2-NH2 -- 2. Hydrolysis -- 3. Addition of Hydrogen Sulphide -- 4. Addition of Alcohols -- 5. Addition of Ammonia -- 6. Addition of Hydroxylamine -- 7. Addition of Hydrazine -- 8. Addition of Mercaptans -- 9. Addition of Polyphenols -- 10. Addition of Grignard Reagent -- 11. Preparation of N-(2-Chloroalkyl) amides -- 12. Formation of Metal Complexes -- References -- CHAPTER 3. REACTIONS OF GROUPS ACTIVATED BY THE CYANO GROUP -- Introduction -- 1. α,β-Unsaturated Nitriles -- 2. Compounds Containing the - CH2CN or =CHCN Group -- 3. Compounds Containing the - NH - or NH2 Group Attached to -CN -- References -- CHAPTER 4. REACTIONS OF GROUPS SENSIBLY UNAFFECTED BY THE CYANO GROUP -- 1. Higher Aliphatic Nitriles -- 2.β,γ-Unsaturated Nitriles -- 3. Aromatic Groups in Nitriles -- 4. Halogen Atoms in Trichloroacetonitrile -- 5. Azo Group in Azobisisobutyronitrile -- 6. Hydrazo Group in 2,2'-Hydrazobisisobutyronitrile -- 7. Ester Group in Nitriles -- 8. Amino Groups (not Directly Linked to a Cyano Group) -- 9. Amidino or Guanidino Group in Dicyanodiamide -- 10. Cobalt in Vitamin B12 (Cyanocobalamin) -- 11. 5,6-Dimethylbenzimidazole in Vitamin B12 -- References -- CHAPTER 5. DEGRADATION REACTIONS DURING WHICH THE CYANO GROUP REMAINS INTACT -- Introduction -- 1. Pyrolysis without Added Reagent -- 2. Pyrolysis in Presence of Oxidising Agents -- 3. Pyrolysis in Presence of a Base -- 4. Reductive Fission of N-cyano Compounds -- 5. Hydrolytic Fission of Cyanohydrins -- 6. Formation of Bromine Cyanide, BrCN. , 7. Elimination of the Cyano Group in the Analytical Methods for Ethyl Dimethylphosphoramidocyanidate (Tabun) -- 8. Elimination of the Cyano Group as Hydrocyanic Acid in Determination of Vitamin B12 -- 9. Formation of Thiocyanic Acid by Reaction with Sulphur -- References -- CHAPTER 6. DEGRADATION REACTIONS INVOLVING DESTRUCTION OF THE CYANO GROUP -- References -- CHAPTER 7. MISCELLANEOUS CHEMICAL METHODS -- References -- PART B: PHYSICAL METHODS -- GENERAL INTRODUCTION -- CHAPTER 8. SPECTROSCOPIC AND SPECTROPHOTOMETRIC METHODS -- 1. Infrared -- 2. Ultraviolet and Visible -- 3. Mass Spectrometry -- 4. Flame Spectroscopy -- 5. Nuclear Magnetic Resonance -- References -- CHAPTER 9. CHROMATOGRAPHIC METHODS -- 1. Gas Chromatography -- 2. Other Chromatographic Methods, Principally PC and TLC -- References -- CHAPTER 10. ION EXCHANGE -- References -- CHAPTER 11. POLAROGRAPHY -- References -- CHAPTER 12. AZEOTROPIC DISTILLATION -- References -- AUTHOR INDEX -- SUBJECT INDEX.
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  • 2
    Electronic Resource
    Electronic Resource
    Springer
    Journal of molecular evolution 14 (1979), S. 33-38 
    ISSN: 1432-1432
    Keywords: Water ; Mars ; Adsorbed water ; Capillary water ; Mineral hydrates-hygroscopic minerals ; Endolithic organisms
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary One of the scientific objectives of the Viking Mission to Mars was to accomplish an analysis of water in the Martian regolith. The analytical scheme originally envisioned was severly compromised in the latter stages of the Lander instrument package design. Nevertheless, a crude soil water analysis was accomplished. Samples from each of the two widely separated sites yielded roughly 1 to 3% water by weight when heated successively to several temperatures up to 500°C. A significant portion of this water was released in the 200° to 350°C interval indicating the presence of mineral hydrates of relatively low thermal stability, a finding in keeping with the low temperatures generally prevailing on Mars. The presence of a duricrust at one of the Lander sites is taken as possible evidence for the presence of hygroscopic minerals on Mars. The demonstrated presence of atmospheric water vapor and thermodynamic calculations lead to the belief that adsorbed water could provide a relatively favorable environment for endolithic organisms on Mars similar to types recently discovered in the dry antarctic deserts.
    Type of Medium: Electronic Resource
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