Protostars are precursors to the nearly fully assembled T-Tauri and Herbig Ae/Be type stars undergoing quasi-static contraction towards the zero-age main sequence; they are in the process of acquiring the majority of their stellar mass. Although numerous young stars with spatially extended envelope-like structures appear to fit this description, their high extinction has inhibited observers fro...

We examine the implications of a beat frequency modulatedmodel of T Tauri accretion. In particular we show that measurements of the variability of accretion generated lines can be used in conjunction with existing photometry to obtain a measurement of the underlying photospheric and disc ux. This provides an independent way of checking spectral energy distribution modelling. In addition, we sho...

Recent analysis of high resolution Chandra X-ray spectra has shown that the Ne/O abundance ratio is remarkably constant in stellar coronae. Based on this result, we point out the utility of the Ne/O ratio as a discriminant for accretionrelated X-rays from T Tauri stars, and for probing the measure of grain-depletion of the accreting material in the inner disk. We apply the Ne/O diagnostic to th...

physiological effect of six levels of water stress (0, -0.1, -.03, -0.6, -0.9 and -1.2 mp) was studied on seed germination and plumule as well as radicule growth length in three species namely: agropyron elongatum, agropyron desertourm and secale montanum. polyethylene glycol (peg) was used to provide appropriate water potentials. a total of 100 seeds in four replications (petri dishes) were so...

We present recent results from observations of binary and multiple systems made with the Navy Precision Optical Interferometer (NPOI) on ζ and σ Orionis A, ξ Tauri, HR 6493, and b Persei. We explain how the orbital modeling is performed and show that even triple systems can be constrained with the data.

We have studied numerically the evolution of protostellar disks around intermediate and upper mass T Tauri stars (0.25 M⊙ < M∗ < 3.0 M⊙) that have formed self-consistently from the collapse of molecular cloud cores. In the T Tauri phase, disks settle into a self-regulated state, with low-amplitude nonaxisymmetric density perturbations persisting for at least several million years. Our main find...

A Abelia 131 Abelmoschus esculentus 371 Abies 112 Abies beshanzuensis 29 Abies beshanzuensis var. ziyuanensis 124 Abies delavayi 124 Abies delavayi var. motuoensis 193 Abies densa 124 Abies ernestii 122 Abies fanjingshanensis 25 Abies fargesii 124 Abies fargesii var. faxoniana 124 Abies ferreana 310 Abies firma 378 Abies forrestii 19 Abies georgei 124 Abies holophylla 152 Abies kawakamii 196 Ab...