January 2008
Groundwater fluoride levels in villages of Southern Malawi and removal studies using bauxite
Dental and skeletal fluorosis are known to be caused by excessive fluoride ingestion particularly from drinking water sources. Dental fluorosis is common in some parts of Malawi but studies on fluoride levels of drinking water sources have not been adequately done. This paper presents our findings in fluoride levels of some drinking water sources in selected rural areas of Southern Malawi and studies on the potential of...
January 2008
On the solution of an HIV- immune dynamic system
Some mathematical properties of nonlinear system associated with an HIV- Immune dynamic model will be given. The considered model will be solved numerically. The numerical method permits the examination of the behaviour of the dynamic system on long-term. In the same time, it is easy to implement, fast convergent and has a very competitive stability results. Numerical results demonstrate the effect of improving the...
January 2008
Complex of nickel (II) with isonicotinohydroxamic acid
Isonicotinohydroxamic acid (INHA) was synthesized, characterized, and its pKa determined spectrophotometrically as 8.680.05 at 25oC and in buffers of 0.1 mol dm-3 ionic strength (I). A spectroscopic investigation of its reaction with NiII in aqueous solution revealed the sole formation of the 1:2 complex at equilibrium. Spectra and magnetic studies of the isolated complex indicate octahedral coordination via...
January 2008
Extraction of Eu(III) from nitrate medium by CYANEX921 using solvent extraction technique
The extraction of Eu(III) was investigated from nitrate medium by CYANEX921 (C921). It was found that the chemical formula of the main extracted species in the organic phase is Eu(NO3)3.3[C921] for extraction by C921. It was found that the Eu(III) percent extracted from toluene, n-hexane, cyclohexane and kerosene was nearly similar but with faster phase separation in favor of toluene. The relation between the shaking...
January 2008
Rb-Sr and U-Pb age dating of granite rocks by inductively coupled plasma mass spectrometry
Inductively coupled plasma-mass spectrometry (ICP-MS) was used as alternative to thermal ionization mass spectrometer (TIMS) for age dating of granite samples originating from different magmatic volcanic rock formations on the Arabian shield. Cation exchange chromatography was used to avoid isobaric overlap of 87Rb with87Sr and 204Hg with 204Pb ions signals to the largest possible extent, while...
January 2008
Calculation of the Mie scattering field inside and outside a coated spherical particle
A procedure to compute intensity distributions generated by the Mie scattering from a single coated sphere is described, and applied to a nanoshell and a microshell. The obtained information on the near-field intensity and the absorbed energy density is shown to be useful in predicting optical properties of the core-shell structure for applications. Key words: Nanoparticles, Mie theory,...
January 2008
Laser-induced emission from dye-doped nanoparticle aggregates of poly (DL-lactide-co-glycolide)
Stable nanoparticles of poly (DL-lactide-co-glycolide) (PLGA) have been prepared, which is photosensitized with near-infrared chromophores doped into the particle. Laser-induced white-light emission is observed from aggregates of the dye-doped nanoparticles, which shows spatial interference of nonlinear optical processes as the underlying mechanism. The accompanied break-up of the aggregates is promising as a possible...
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