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Now showing items 71-80 of 204
Examination of Blepharis aspera as a possible Cu–Ni indicator plant
(South African Journal of Science, 2007)
BLEPHARIS ASPERA WAS COLLECTED FROM A
copper–nickel mineralized area in Botswana
and examined as a possible Cu–Ni indicator
plant for biogeochemical prospecting. Different
plant parts and the host soils were analysed
using ...
Diprenylated chalcones and other constituents from the twigs of Dorstenia barteri var. subtriangularis
(Elsevier Ltd; www.elsevier.com/locate/phytochem, 2003)
The twigs of Dorstenia barteri var. subtriangularis yielded three diprenylated chalcones: ( )-3-(3,3-dimethylallyl)-50-(2-hydroxy-3-
methylbut-3-enyl)-4,20,40-trihydroxychalcone, (+)-3-(3,3-dimethylallyl)-40,50-[2000-(1 ...
Diterpenoids from the stem bark of Croton zambesicus
(Elsevier Science Ltd. www.elsevier.com/locate/phytochem, 2002)
Three clerodane diterpenoids, crotozambefurans A, B and C were isolated from the stem bark of Croton zambesicus together with
the known clerodane crotocorylifuran and two trachylobanes: 7b-acetoxytrachyloban-18-oic acid ...
Viscosity behaviour of particles with non-adsorbing polymers Part III—experimental study
(Elsevier B.V. www.elsevier.com/locate/colsurfa, 2004)
A series of well characterised cis-poly(isoprene) (PIP) polymers (Mw = 1180, 8000, 28 300, 31 500, 86 000, 115 000 and 130 000) have
been added to dispersions of poly(12-hydroxystearic acid) (PHS) coated poly(methylmethacrylate) ...
Voluntary counseling and testing among post-partum women in Botswana
(Elsevier www.elsevier.com/locate/pateducou, 2007)
Objective: To determine uptake and socio-demographics predictors of acceptance of voluntary counseling and testing (VCT) among postpartum women in Botswana.
Methods: Women attending maternal and child health clinics for ...
Type II superconducting disk in a spatially inhomogeneous applied magnetic field
(Elsevier Science Ltd. www.elsevier.com/locate/physc, 2003-01)
The problem of a type II superconducting disk in a spatially inhomogeneous magnetic field is considered. The aim
of the investigations undertaken here is to evaluate the effects of the spatial inhomogeneity of the parallel ...
A numerical study of some modified differential evolution algorithms
(Elsevier; www.elsevier.com/locate/ejor, 2006)
Modifications in mutation and localization in acceptance rule are suggested to the differential evolution algorithm for global optimization. Numerical experiments indicate that the resulting algorithms are considerably ...
Viscosity, molecular weight and concentration relationships at 298K of low molecular weight cis-polyisoprene in a good solvent
(Elsevier B.V. www.elsevier.com/locate/colsurfa, 2007)
Aseries of six well characterised homopolymers of cis-polyisoprene (PIP) ranging from 1180 to 115,000 molecular weight were utilised to explore
viscosity and the scaling relationship between viscosity and concentration ...
Homoisoflavonoids and xanthones from the tubers of wild and in vitro regenerated Ledebouria graminifolia and cytotoxic activities of some of the homoisoflavonoids
(Elsevier Ltd. www.elsevier.com/locate/phytochem, 2002)
Eleven homoisoflavonoids and two xanthones were isolated and characterized from the bulbs of Ledebouria graminifolia. Five of
the homoisoflavonoids are new compounds and were identified as: 5-hydroxy-7-methoxy-3-(40-hyd ...
Dinklagins A, B and C: three prenylated flavonoids and other constituents from the twigs of Dorstenia dinklagei
(Elsevier Science Ltd. www.elsevier.com/locate/phytochem, 2002)
Three prenylated flavonoids, dinklagins A, B and C identified, respectively, as ( )-6-(3,3-dimethylallyl)-7-hydroxy-6000, 6000-dimethylchromeno-(
40,30,2000,3000)-flavanone, (+)-5,40,500x-trihydroxy-600,600-dimethylchro ...