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  • 1
    ISSN: 1618-2650
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract An attempt has been made to prepare a Secondary Reference Material for heavy metals in milk powder. From fresh milk obtained locally, two batches of milk powder have been prepared by pasteurising, homogenising, evaporating and spray drying. One of the batches, treated as an experimental batch, was spiked before the preparation with lead, cadmium and arsenic solutions (imported BDH standards) at a level about 1 mg/kg. After spray drying, both batches were packed under nitrogen using a polyester-aluminium/polyethylene foil as inner pouch and an outer cover of metallised polyester/polyethylene as a supporting film. Preliminary data have been obtained for the concentrations of Pb, Cd and As in both batches using acid digestion and flame AAS and UV/Vis spectrophotometry.
    Type of Medium: Electronic Resource
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  • 2
    ISSN: 1573-1561
    Keywords: Behavioral responses ; cowpea weevil ; Callosobruchus chinensis ; Coleoptera ; Curculionidae ; water hyacinth ; Eichhornia crassipes ; olfactometer
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology
    Notes: Abstract The behavioral responses of cowpea weevil,Callosobruchus chinensis to the leaf extracts of the aquatic weed, water hyacinth,Eichhornia crassipes (Mart) Solms. was evaluated by three different methods. The petroleum ether-soluble fraction ofE. crassipes induced high weevil attraction in all methods employed. The olfactometer assay provided a reading on weevil chemosensory responses, whereas the free-choice tests measured response and preference of weevils to the untreated or extract-treated food grain of their choice over a longer period. The extracts were also presented under no choice test conditions to assay them for the presence of oviposition stimulants. In all these methods the extracts of water hyacinth evoked a quick directional response. Another interesting feature is that the extract, besides producing attraction, also caused mortality of the insects.
    Type of Medium: Electronic Resource
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