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R Stone

Publications and source records attributed to R Stone.

At least 37 records · Page 2Linked to original sources
PubMed2001

Measurement of CP-violating asymmetries in B0 decays to CP eigenstates.

We present measurements of time-dependent CP-violating asymmetries in neutral B decays to several CP eigenstates. The measurement uses a data sample of 23x10(6) Upsilon(4S)-->BbarB decays collected by the BABAR detector at the PEP-II asymmetric B Factory at SLAC. In this sample, we find events in which one neutral B meson is fully reconstructed in a CP eigenstate containing charmonium and the flavor of the other neutral B meson is determined from its decay products. The amplitude of the CP-violating asymmetry, which in the standard model is proportional to sin2beta, is derived from the decay time distributions in such events. The result is sin2beta = 0.34+/-0.20 (stat)+/-0.05 (syst).

Journal Article↗
PubMed2001

Ring-enchancement in multiple sclerosis: marker of disease severity.

Correlations between conventional MRI measures of disease activity and clinical disability in multiple sclerosis (MS) have been disappointing. Because ring-enhancing lesions may reflect a more destructive pathology, we tested their potential association with disease severity. We evaluated active lesions with regard to their enhancement pattern on serial magnetic resonance images in a cohort of 28 patients with relapsing-remitting MS. The percentage of ring-enhancing lesions correlated with EDSS, T2 lesion load and duration of disease and predicted the occurrence of relapses during the baseline period of observation as well as after 3 years of follow-up in multiple logistic regression analysis. The findings suggest that the pathological process reflected by ring-enhancing lesions may contribute to more severe clinical disease.

Adult↗
PubMed2000

Dick Mol. 'Sir Mammoth' leads charge to uncover Ice Age fossils.

Dick Mol may be an amateur, but he's had more success than most professionals in his chosen field of paleontology. As scientific coordinator of a major expedition that's gathering the remains of woolly mammoths and other Pleistocene fauna from Siberia's Taimyr Peninsula, this 45-year-old customs officer at Amsterdam airport has been featured in a documentary on the Discovery Channel and in a sequel to appear next March. The work has brought him international recognition for his studies on quaternary paleontology, the study of the Pleistocene and today's Holocene Epochs.

Animals↗
PubMed2000

Virology. Canine virus blamed in Caspian seal deaths.

Canine distemper virus has been identified as the most likely cause of a die-off of thousands of seals in the Caspian Sea earlier this year. Although the findings by two independent research groups allay fears of a threat to humans, they heighten concerns about the survival of the imperiled species.

Animals↗
PubMed2000

Stem cell research. U.K. backs use of embryos, sets vote.

The U.K. government last week endorsed a report that advocates tapping embryos for their stem cells, unspecialized cells that may ultimately serve as seed material for growing tissues to treat diseases. It also opens the door to cloning human embryos for research--an activity that has triggered sharp debate. Legislation implementing the recommendations will go to Parliament for a vote this fall.

Bioethics↗
PubMed2000

Biomedical research. Hughes grants target infectious diseases.

The Howard Hughes Medical Institute has launched a new program of 5-year grants that funds 45 scientists in 20 countries. The $15 million initiative, which supports research on a variety of infectious and parasitic diseases, marks the first Hughes program outside the United States that is tailored to a specific research area.

Academies and Institutes↗