$U(3) \times U(3)$ Chiral Symmetry

Isolation and characterization of three rat U3 RNA pseudogenes colinear with U3 RNA.

Three different 15-kilobase rat genomic clones that contained sequences colinear with U3 RNA were isolated. These inserts hybridized only to U3 RNA in a mixture of total cellular 4-8 S RNA labeled in vivo which showed that genes or pseudogenes for most other small RNAs were absent in these U3 DNA clones. DNA sequence analysis showed that the three subcloned genes contained full-length U3-coding...

U3+/LiYF4, a promising IR laser

Under reducing conditions, single crystal of LiYF4 doped with 762 ppm of u3+ were obtained. Absorption andfluorescence spectra of this system are presented as well as the energy level scheme of the lasing 4 4 transition. Oscillator strength and laser cross section between Stark levels of the + 19,2 transition are calculated.

Comparative analysis of eukaryotic U3 snoRNA.

The U3 snoRNA is an exceptional box C/D snoRNA, which is involved in pre-rRNA processing without directing chemical modifications. We report here on a comprehensive computational survey resulting in U3 sequences for more than 90 additional eukaryotes. This extended data basis is used to improve the secondary structure models. The detailed investigation of the structural variation of U3 snoRNAs ...

HYPERELLIPTIC JACOBIANS AND U3(2 m)

Nuclear retention elements of U3 small nucleolar RNA.

The processing and methylation of precursor rRNA is mediated by the box C/D small nucleolar RNAs (snoRNAs). These snoRNAs differ from most cellular RNAs in that they are not exported to the cytoplasm. Instead, these RNAs are actively retained in the nucleus where they assemble with proteins into mature small nucleolar ribonucleoprotein particles and are targeted to their intranuclear site of ac...