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  • 1955-1959  (7)
  • 1
    Electronic Resource
    Electronic Resource
    Occurrence and Nature of an Amœba Excystment Factor produced by Aerobacter sp. (1956)
    [s.l.] : Nature Publishing Group
    Nature 177 (1956), S. 621-622 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Crump1 showed that excystment in Amoeba Z (Didascalus ihorntoni ; Singh6) took place without the presence of bacteria, while Amoeba 4 (Schizo-pyrenus russelli; Singh6) excysted only in the presence of certain bacteria (Aerobacter sp. and 4036). She suggested that the two species of bacteria produce ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/177621a0
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Sodium hypochlorite as volumetric reagent (1958)
    Springer
    Fresenius' Zeitschrift für analytische Chemie 160 (1958), S. 429-432 
    Details
    ISSN: 1618-2650
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Summary Sodium hypochlorite solution has been used as an oxidising agent for the volumetric determination of semicarbazide hydrochloride, phenylhydrazine hydrochloride, benzalazine, benzalsemicarbazone, o-chlorobenzalsemicarbazone, acetonesemicarbazone, aminoguanidine hydrochloride, thiosemicarbazide, o-hydroxy benzalsemicarbazone, 3,4-methylenedioxy benzalsemicarbazone and p-methoxy benzalsemicarbazone, using iodine monochloride as catalyst and preoxidizer. During these titrations normality of the solution with respect to hydrochloric acid has been kept between 2.0 N and 3.5 N. Chloroform is used as an indicator. It is coloured pink due to the liberation of iodine during the titration and becomes very pale yellow at the end-point owing to the formation of iodine monochloride. Each hydrazino group in these compounds is oxidised quantitatively with a four-electron change to nitrogen with sodium hypochlorite as an oxidant in hydrochloric acid solution.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00468566
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Bismuthiol II as an analytical reagent (1958)
    Springer
    Fresenius' Zeitschrift für analytische Chemie 161 (1958), S. 81-86 
    Details
    ISSN: 1618-2650
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Summary With copper, bismuthiol II forms both cuprous and cupric complexes which are stable in mineral acids, acetic, citric and tartaric acids and the cuprous complex compared to cupric is insoluble in EDTA solution as well in organic solvents. The melting points of both cupric and cuprous complexes are respectively 148° C and 198° C. As an insoluble cupric complex copper is estimated from solutions having a maximum acidity of 0.1 N in hydrochloric or sulphuric acid and of 0.5 N in acetic acid. Even at a lower acidity, up to a pH of about 6.2, the precipitation of copper is quantitative but at a pH higher than 6.2 the copper complex shows an increased solubility. By the proper control of pH and by suitable masking agents, it is possible to separate copper from almost all the ions except palladium, cadmium, lead and thallous ions. Cuprous complex, being more stable and insoluble and having practically the same tolerance to an acid solution or to a solution at a high pH, helps towards a more complete separation of copper from all the ions stated except the thallous and bismuth.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00484254
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  • 4
    Electronic Resource
    Electronic Resource
    Bismuthiol II as an analytical reagent (1957)
    Springer
    Fresenius' Zeitschrift für analytische Chemie 155 (1957), S. 86-90 
    Details
    ISSN: 1618-2650
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Summary Thallium (I) forms the Bismuthiol II complex of composition C8H5N2S3 Tl. At about 10° C, it is completely precipitated at high acidity as well as at high alkalinity and the precipitate can be dried at any temperature up to 250° C. The complex is highly stable in presence of a tartrate or citrate, cyanide and complexone III and because of the unusual stability it can be estimated and separated from practically all ions. Bismuthiol II thus can be considered as a highly selective reagent for thallium (I) in presence of a mixture of cyanide and tartrate maintained at aph between 7 and 9.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00475102
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  • 5
    Electronic Resource
    Electronic Resource
    Bismuthiol II as an analytical reagent (1958)
    Springer
    Fresenius' Zeitschrift für analytische Chemie 161 (1958), S. 261-263 
    Details
    ISSN: 1618-2650
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Summary Bismuthiol II reacts with trivalent arsenic and antimony to form complexes of compositions As(C8H5N2S3)3 and Sb(C8H5N2S3)3 respectively, while with stannous the reaction is not stoichiometric. The ions of arsenic and antimony can be estimated, from an acid solution, 0.1 N in hydrochloric or sulphuric acid, with the ammonium or the sodium chloride as the coagulant. The complexes have low melting points and they are soluble in organic solvents.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00463398
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  • 6
    Electronic Resource
    Electronic Resource
    Bismuthiol II as an analytical reagent (1958)
    Springer
    Fresenius' Zeitschrift für analytische Chemie 161 (1958), S. 257-260 
    Details
    ISSN: 1618-2650
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Summary Cadmium can be estimated both gravimetrically and volumetrically after precipitation as the Bismuthiol II complex having the composition (C8H5N2S3)2Cd. The complex is stable in the acid range and the best working pH is from 3 to 7. The method affords the separation of cadmium from ions of alkalis, alkaline earths, molybdate, vanadate, tungstate, bismuth, arsenic, antimony, tin, manganese, cobalt, nickel, zinc, and other tri- and tetra-valent elements. Higher amounts of zinc usually coprecipitate. The complex is stable up to a temperature of 315° C. For volumetry, the complexometric method was found to be highly suitable with eriochrome black T as the indicator.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00463397
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  • 7
    Electronic Resource
    Electronic Resource
    Sodium hypochlorite as volumetric reagent (1958)
    Springer
    Fresenius' Zeitschrift für analytische Chemie 162 (1958), S. 325-327 
    Details
    ISSN: 1618-2650
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Summary In presence of 5 N to 6 N hydrochloric acid, ferrous ethylenediamine sulphate was used as a reducing agent to determine indirectly potassium chlorate, potassium bromate, potassium metaperiodate, potassium dichromate, potassium ferricyanide, potassium permanganate, potassium persulphate, hydrogen peroxide, ceric sulphate and chloramine-T. An excess of ferrous ethylenediamine sulphate added to each of the substances in the acid medium was titrated with a standard solution of sodium hypochlorite. Iodine monochloride was used as catalyst and preoxidizer and chloroform was used as an indicator. Chloroform was coloured violet owing to the liberation of iodine during the titration and became very pale yellow at the end-point because of the formation of iodine monochloride.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00453223
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