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To improve the time and frequency reference standards used for radio astronomy and high precision atomic physics applications, we describe a novel stable frequency transmission technique. The approach uses a vertical-cavity surface- emitting laser (VCSEL) based phase correction actuator. Using a frequency mixing process for feedback control, the phase noise induced along the 26 km G.655 optical fibre...
Next-generation FTTH technology is aggressively being developed and deployed in Europe, Asia and in the USA. Countries like Japan with high per-capita income and high-density residential complexes remain at the forefront of FTTH and WDM-PON developments. The majority of African countries face unique socio-economic challenges, along with sprawling population distributions. As such, there is a need...
The methylation status of ribosomal gene (rRNA) clusters have been investigated in a large variety of angiosperm species. Here we have analysed methylation in ribosomal gene (rRNA) clusters using MspI, HpaII, BstNI, EcoRII and CfoI restriction enzymes in combination with Southern hybridization to the 25S rDNA probe. It was shown that cytosine methylation at CpG dinucleotides and CpNpG trinucleotides...
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