We construct a composite quasar spectrum from 284 HST FOS spectra of 101 quasars with redshifts z > 0.33. The spectrum covers the wavelengths between 350 Å and 3000 Å in the rest frame, with a peak S/N level of ∼ 130 per Å at ∼ 1200 Å. Since ∼ 90% of the sample quasars have redshift z < 1.5, the spectrum is suitable for studying the wavelength region shortward of Lyα without large effects from ...

A water-soluble doubly N-confused hexaphyrin (N(2)CH) having two octa-arginine peptide arms displays an enhanced near-infrared (NIR) emission around 1050 nm in the presence of Zn(2+) in aqueous solution.

Many human degenerative diseases involve free radical processes that nutritional antioxidants may ameliorate or prevent, but the optimum intake of such nutrients has yet to be established. Requirement will depend in part on the level of exposure to exogenous and endogenous reactive oxygen species. Smokers incur a sustained degree of oxidant stress from both of these sources, increasing their re...

Ultrafine-grained Cu/Al/Ag composites were processed by an accumulative roll bonding (ARB) technique from pure copper and aluminum sheets a silver powder. The Al content was fixed to 11 wt.% while the concentration 1, 2, or 3 in wt.%. ARB-processed samples heat treated at different temperatures between 750 1050 °C for 60 min then quenched room temperature (RT) producing Cu–Al–Ag alloys. effect ...

In this paper, the equiaxed superfine/nanocrystalline duplex PM-TiAl-based alloy with (γ + α₂) microstructure, Ti-45Al-5Nb (at %), has been synthesized by high-energy ball milling and vacuum hot pressing sintering. Superplastic deformation behavior has been investigated at 1000 °C and 1050 °C with strain rates from 5 × 10-5 s-1 to 1 × 10-3 s-1. The effects of deformation on the microstructure a...

Erratum Following publication of the original version [1] of the article in BMC Gastroenterology, it was brought to our attention that there was a mistake in the references list. Please see updated references below: 32. Gomez-Gallego C, Collado MC, Perez G, Ilo T, Jaakkola UM, Bernal MJ et al. Resembling breast milk: influence of polyamine-supplemented formula on neonatal BALB/cOlaHsd mouse mic...

We present a V I photometric catalogue towards the open cluster Cr 121. XMMNewton and ROSAT data are used to discover a low-mass pre-main sequence (PMS) along this sight-line. de Zeeuw et al. (1999) identified Cr 121 as a moving group, using HIPPARCOS data, at a distance of 592 pc. We reject the scenario that these low-mass PMS stars are associated with that association. By considering the high...

It is known that immobilization of the rat hindlimb by plaster casting leads to muscle atrophy and loss of muscle protein. In the present study, immobilization of the rat hindlimb for 6 h resulted in a significant 27% decrease in the absolute rate of cytochrome c synthesis in the red quadriceps muscle, without any change in the relative amount of cytochrome c mRNA. Cytochrome c mRNA in normal r...

Hyperspectral remote sensing has demonstrated great potential for accurate retrieval of canopy water content (CWC). This CWC is defined by the product of the leaf equivalent water thickness (EWT) and the leaf area index (LAI). In this paper, in particular the spectral information provided by the canopy water absorption feature at 970 nm for estimating and predicting CWC was studied using a mode...