BACKGROUND Polonium-210 (²¹⁰Po) concentrations that exceed 1 Bq/L in drinking-water supplies have been reported from four widely separated U.S. states where exposure to it went unnoticed for decades. The radionuclide grandparents of ²¹⁰Po are common in sediments, and segments of the public may be chronically exposed to low levels of ²¹⁰Po in drinking water or in food products from animals raise...

According to Poole et al. (1970, J. Cell Biol. 45:408-415), newly synthesized peroxisomal proteins are incorporated uniformly into peroxisomes (PO) of different size classes, suggesting that rat hepatic PO form a homogeneous population. There is however increasing cytochemical and biochemical evidence that PO in rat liver are heterogenous, undergoing significant modulations in shape and size in...

Incubation of rat sciatic nerve slices with Krebs-Ringer bicarbonate buffer containing [3H]palmitic acid resulted in the acylation of the PO glycoprotein and a 24 kDa protein of the peripheral nerve myelin. Radioactivity was removed from PO after treating PO with hydroxylamine (83%) and methanolic KOH (97%). These results provided evidence that the radioactivity incorporated into PO was not due...

[reaction: see text] H-Phosphonate monomers of 2'-O-(2-methoxyethyl) ribonucleosides have been synthesized. Oxidation of oligonucleotide H-phosphonates has been optimized to allow the synthesis of oligonucleotides containing either 2'-deoxy or 2'-O-(2-methoxyethyl) ribonucleoside residues combined with three different phosphate modifications in the backbone, i.e., phosphodiester (PO), phosphoro...

The development of peroxidase (PO) reaction in the nuclear envelope (NE) and endoplasmic reticulum (ER) of monocytes differentiating in vitro and its relationship with arachidonic acid metabolism were studied. The PO, as visualized by the diaminobenzidine (DAB) technique, appeared in the NE and ER of the majority of monocytes within 24 hours of culture, with a substantial decrease thereafter. T...

Ntsama Eloundou Pascal , Pierre Ele *2 Serfebé Zoua Dieudonné , Emmanuel Tonye *4 # Electronics Laboratory, Physics Department, University of Ngaoundéré Faculty of Science, PO Box 454, Ngaoundéré, Cameroon 1 [email protected] 3 [email protected] * ENSP, University of Yaoundé I, Cameroon 2 [email protected] 4 [email protected] Abstract—In this paper, we are conducting an evaluation the com...

Separation of rat sciatic nerve myelin proteins by sodium dodecyl sulfate-slab gel electrophoresis 18 h after injection of [3H]palmitic acid into the nerve demonstrated acylation of the PO protein. When sciatic nerve myelin labeled with [3H]palmitic acid was extracted with acidified chloroform/methanol or chloroform/methanol, the radioactivity associated with PO was retained. These results prov...

The Physical Optic (PO) surface integral has been expressed in its basic components by the unique Modified Edge Representation (MER) currents line integration definition. The Scatterer Geometrical Optics (SGO) component field is associated with the Stationary Phase Point (SPP) bellowing to the illuminated region of the scatterer and the diffracted field component with its illuminated boundary. ...

To determine the type of mutation induced by 8-hydroxyguanine in a mammalian system, we examined the mutations induced by a synthetic i -I la-ruv protooncogene containing 8-hydroxyguanine in the second po sition of codon 12 (GGC) in NIH3T3 cells. Transaction of this gene significantly increased the number of transformed foci. The c-Ha-r<w gene present in these foci was analyzed by the polymeras...

The incident in London during November 2006 involving a lethal intake by Mr. Alexander Litvinenko of the highly-radioactive, alpha-particles-emitting polonium-210 (Po-210) isotope, presumably via ingestion, sparked renewed interest in the area of Po-210 toxicity to humans. This paper is the result of assembling and interpreting existing Po-210 data within the context of what is considered a rel...