Green world: The presence of decaying trees in primeval and unmanaged woodlands is an important factor in supporting biodiversity. (Photo: Ralf Lotys/Wikipedia.) After the end of the last glacial period around 11,700 years ago, forests took over most of Europe, replacing the tundra and steppe and reconquering the land that had been covered by glaciers. Over the last three millennia, Europeans h...

In the last issue of Asia Pacific Journal of Medical Toxicology (APJMT), editor-in-chief, Dr. Reza Afshari focused on an important contemporary issue of empowering toxicology in the Asia pacific region (1). The topic drew our attention and we would like to share the situation of Bangladesh in light of this editorial. Dr. Afshari correctly emphasized on forming national societies of medical toxi...

We use the POTENT reconstruction of the mass density field in the nearby universe to estimate the amplitude of the density fluctuation power spectrum for various cosmological models. We find σ8 Ω 0.6 m = 1.3 +0.4 −0.3, almost independently of the power spectrum. This value agrees well with the COBE normalization for the standard CDM model, while some alternative models predict an excessive ampl...

A primeval galaxy represents the earliest stages of a galaxy's life and as such provides clues to the early history of the Universe and the evolution of stars and galaxies. Over the last 20 years astronomers have been engaged in the quest to detect the faint signals from these objects, believed to lie at a distance comparable with the size of the Universe. A wide variety of observational techni...

We present model calculations for the expected surface density of Ly-α emitting primeval galaxies (PGs) at high redshifts. We assume that elliptical galaxies and bulges of spiral galaxies (= spheroids) formed early in the universe and that the Ly-α emitting PGs are these spheroids during their first burst of star formation at high redshift. One of the main assumptions of the models is that the ...

The Primeval Structure Telescope (PaST), will be used search for and study the era the of the first luminous objects, the epoch of reionization. The first stars ionized the gas around them producing a pattern of ionization that reflects the large scale density structure present at the time. The PaST array will be used in an attempt to sense and study this ionization, by mapping the brightness o...