Rare earth doped SnO2 nanoscaled powders and coatings: enhanced photoluminescence in water and waveguiding properties.

Luminescent Eu3+ and Er3+ doped SnO2 powders have been prepared by Sn4+ hydrolysis followed by a controlled growth reaction using a particle's surface modifier in order to avoid particles aggregation. The powders so obtained doped with up to 2 mol% rare earth ions are fully redispersable in water at pH > 8 and present the cassiterite structure. Particles size range from 3 to 10 nm as determined by Photon Correlation Spectroscopy.

Cloning of higher plant omega-3 fatty acid desaturases.

Arabidopsis thaliana T-DNA transformants were screened for mutations affecting seed fatty acid composition. A mutant line was found with reduced levels of linolenic acid (18:3) due to a T-DNA insertion. Genomic DNA flanking the T-DNA insertion was used to obtain an Arabidopsis cDNA that encodes a polypeptide identified as a microsomal omega-3 fatty acid desaturase by its complementation of the mutation.

The murine complement receptor gene family. III. The genomic and transcriptional complexity of the Crry and Crry-ps genes.

The murine CR genes Crry (previously termed mCRY) and Crry-ps (previously termed mCRX) are two distinct, but related, sequences which are the evolutionary homologs to sequences contained within the human CR1 gene. Screening a BALB/c genomic DNA library with the Crry/Crry-ps specific cDNA resulted in the isolation of two clusters of genomic sequences: those specific for Crry and those specific for Crry-ps. The coding sequences of the Crry gene encompass over 25 kb of DNA, whereas the Crry-ps sequences are included within a single 5.