Optical, electronic and structural properties of nanocrystals fundamentally derive from crystal phase. This is especially important for polymorphic II-VI, III-V and I-III-VI2 semiconductor materials such as cadmium selenide, which exist as two stable phases, cubic and hexagonal, each with distinct properties. However, standard crystallographic characterization through diffraction yields ambiguo...

Particulate hexavalent chromium (Cr(VI)) is a well-established human lung carcinogen. Lung tumors are characterized by structural and numerical chromosome instability. Centrosome amplification is a phenotype commonly found in solid tumors, including lung tumors, which strongly correlates with chromosome instability. Human lung cells exposed to Cr(VI) exhibit centrosome amplification but the und...

O. ANDRÉN , H. KIRCHMANN , T. KÄTTERER , J. MAGID , E. A. PAUL & D. C. COLEMAN TSBF-CIAT, PO Box 30677-00100, Nairobi, Kenya, Department of Soil Sciences, PO Box 7014, SLU, S-750 07 Uppsala, Sweden, The Royal Veterinary and Agricultural University, Bülowsvej 17, DK-1870 Frederiksberg C, Denmark, NREL, Colorado State University, Fort Collins, CO 80523-1499, USA, and Institute of Ecology, Ecology...

This study evaluated the impact of DOM from two biochars (sugar beet tailing and Brazilian pepper) on Cr(VI) reduction and As(III) oxidation in both ice and aqueous phases with a soil DOM as control. Increasing DOM concentration from 3 to 300mgCL(-1) enhanced Cr(VI) reduction from 20% to 100% and As(III) oxidation from 6.2% to 25%; however, Cr(VI) reduction decreased from 80-86% to negligible w...

Whole-genome DNA microarrays were used to examine the gene expression profile of Shewanella oneidensis MR-1 during U(VI) and Cr(VI) reduction. The same control, cells pregrown with nitrate and incubated with no electron acceptor, was used for the two time points considered and for both metals. U(VI)-reducing conditions resulted in the upregulation (> or = 3-fold) of 121 genes, while 83 genes we...

Batch experiments were used to evaluate the reductive immobilization of hexavalent uranium (U(VI)) by synthesized, amorphous iron sulfide (FeS) in the anoxic environment. The tests were initiated by spiking 168.0 microM U(VI) to 0.18 g/L FeS suspensions under a CO2-free condition with pH varied from 5.99 to 10.17. The immobilization rate of U(VI) was determined by monitoring the changes of aque...

We present a Far-Ultraviolet Spectroscopic Explorer survey of highly ionized high-velocity clouds (HVCs) in 66 extragalactic sight lines with S/N1030 >8. We searched the spectra for high-velocity (100 < |vLSR| < 400km s ) O VI absorption and found a total of 63 absorbers, 16 with 21 cmemitting H I counterparts and 47 “highly ionized” absorbers without 21 cm emission. The highly ionized HVC popu...

Objective: The aim of this research is to create a versatile approach produce cellulose from nipa fronds, which are sustainable resource. Methods: study focuses on determining the amount in effectiveness simplified physicochemical pretreatment, and purity isolated a-cellulose. biomass was pretreated using physical chemical methods analyzed through gravimetric analysis determine its composition,...

Using five high-resolution (λ/∆λ ≈ 3000) FUV (λλ = 910–1210 Å) spectra acquired in 1996 December during the flight of the ORFEUS-SPAS II mission, 47 archival IUE short-wavelength UV (λλ = 1150–1950 Å) spectra, and archival EUVE deep survey photometry (λλ ≈ 70–200 Å), we present a detailed picture of the behavior of the magnetic cataclysmic variable EX Hydrae in the vacuum ultraviolet. Like HUT ...

The Renewable Energy Materials Research Science and Engineering Center (REMRSEC) has made substantial progress in its research mission of identifying, launching and advancing innovative research directions in materials for renewable energy, and in its human resource mission of educating the next generation of renewable energy professionals, reaching out to students and the general community, an...