Phosphorus status of pastoral soils where reactive phosphate rock fertilisers have been used

I-36: Preimplantation Genetic Diagnosis - Where Have We Been and Where Are We Going

Preimplantation genetic diagnosis (PGD) is now considered routine in IVF laboratories with micromanipulation capability and access to genetic diagnostic services. The past two decades have witnessed a dramatic increase in the use of PGD, the number of cycles performed, and the indications for which PGD has been used. This increase has been mirrored by a slow, but steady, increase in the range o...

Asking photons where they have been.

We present surprising experimental evidence regarding the past of photons passing through an interferometer. The information about the positions through which the photons pass in the interferometer is retrieved from modulations of the detected signal at the vibration frequencies of mirrors the photons bounce off. From the analysis we conclude that the past of the photons is not represented by c...

Where we have been, where we are going.

Bordetella pertussis Isolates Circulating in China Where Whole Cell Vaccines Have Been Used for 50 Years.

TO THE EDITOR—Despite extensive vaccinations, whooping cough has resurged in industrial countries. The major explanations include wanning immunity associated with the acellular pertussis vaccines (ACVs) and Bordetella pertussis adaptation to vaccine-induced immunity. ACVs contain purified antigens in different combinations: pertussis toxin (Ptx), filamentous hemagglutin, pertactin (Prn), and fi...

The Fate of Phosphate Fertilisers in Soil

Phosphorus is thus naturally available in the soil. However, there isn't usually enough available for plants to grow well. Phosphorus levels are reduced by animals eating the plants then dying elsewhere so that the phosphorus is removed, and also by phosphorus being adsorbed into soil particles or washed away by excess rain. For this reason phosphate fertilisers are widely used. The ways in whi...