Asymptotically Safe Standard Model via Vector-Like Fermions

We construct asymptotically safe extensions of the Standard Model by adding gauged vector-like fermions. Using large number-of-flavour techniques we argue that all gauge couplings, including the hypercharge and, under certain conditions, the Higgs coupling can achieve an interacting ultraviolet fixed point.Comment: 5 pages, 3 figures, typos fixe

A comparison of methods for calculating condition index in eastern oysters Crassostrea virginica (Gmelin, 1791)

A number of techniques have been reported to estimate condition index in oysters and other bivalve molluscs. We report and compare condition index, estimated by three different methods, for oysters collected from a single reef in the James River, Virginia over a four week period in the summer of 1987. Two indices express condition as a ratio of dry meat weight to shell cavity volume, but differ in methods of estimating shell cavity volume. A third method expresses condition as a ratio of dry meat weight to dry shell weight. Within the size range 36-96 mm length there is no effect of size on index values. We suggest that indices based on both shell cavity vqlume and shell weight have utility in reflecting biochemical or nutritive status; however, intercalibration is difficult and comparisons of data from different authors and locations limited in scop

Effect of decreasing oxygen tension of swimming rate of Crassostrea virginica (Gmelin, 1791) larvae

Four sizes of Crassostrea virginica Gmelin larvae (mean lengths 76.8, 118.1, 139.7 and 290.2 [Lm) were exposed to ·stepwise decreases in oxygen concentration from I 00% saturation (5 .38 mill at 22°C and 22 ppt salinity) to as low as 10% saturation and their swimming rates (net vertical movement per unit time) were recorded at each oxygen concentration. No cessation of swimming was observed and in only two conditions, that of 76.8 [Lm larvae at 10% saturation and 290.2 j.Lm larvae at 21% saturation, was swimming rate significantly lower than that of the same size larvae at full saturation

A systematic review of publicity interventions to increase awareness amongst healthcare professionals and the public to promote earlier diagnosis of type 1 diabetes in children and young people

Read the full text ePDF PDF ePDFPDF PDF Tools Share Abstract Background Children with new onset type 1 diabetes (T1D) are at risk of developing the life‐threatening condition ketoacidosis if they have a delayed diagnosis. The rate of children presenting in ketoacidosis remains high in a number of countries worldwide. To ensure interventions to raise awareness of symptoms are effective a systematic review was conducted to evaluate previous publicity campaigns. Methods A range of databases was searched using search terms relating to T1D, publicity campaigns, and symptom awareness. Identified articles were checked against the inclusion criteria, ensuring interventions were designed to target individuals prior to diagnosis of T1D. Papers were independently assessed under the criteria specified within the Critical Appraisal Skills Programme checklist. Results The initial search retrieved 1537 papers and following screening 20 were identified for full consideration. Thirteen did not meet the inclusion criteria, leaving 7 to be assessed. Of these 7, 2 observational case‐control studies reported a reduction in the rate of ketoacidosis following a publicity campaign using posters and providing glucose testing equipment to primary healthcare professionals. Four observational cohort studies, utilized posters, and media campaigns; 2 reported a reduction in the rate of ketoacidosis and 2 reported no difference following their interventions. A feasibility study, not designed to evaluate effectiveness, reported some anecdotal evidence of a more timely diagnosis. Conclusion Due to the methodological limitations of the studies identified, it is not possible to make a definitive conclusion on the effectiveness of the interventions reported

Insensitivity of flavoured leptogenesis to low energy CP violation

If the baryon asymmetry of the Universe is produced by leptogenesis, CP violation is required in the lepton sector. In the seesaw extension of the Standard Model with three hierarchical right-handed neutrinos, we show that the baryon asymmetry is insensitive to the PMNS phases: thermal leptogenesis can work for any value of the observable phases. This result was well-known when there are no flavour effects in leptogenesis; we show that it remains true when flavour effects are included.Comment: 4 pages, 1 figure; version accepted for publication, added explanations, notation clarifie

Reproductive Activity Of Oysters, Crassostrea-Virginica (Gmelin, 1791) In The James River, Virginia, During 1987-1988

Reproductive activity in oysters, Crassostrea virginica Gmelin, in the James River, Virginia, was examined for 1987 from weekly estimates for fecundity and egg viability in oysters collected from Wreck Shoal, and for 1988 from weekly estimates of fecundity, egg viability, gonad volume fraction, gonad thickness, and mean egg size in oysters collected from Horsehead Reef. Maximum and mean fecundity values from Wreck Shoal oysters were higher than from Horsehead oysters. No relationship was evident between fecundity and egg viability at Horsehead Reef. A strong temporal relationship was observed between egg viability and peak oyster settlement in the James in both years of the study as estimated by off-bottom settlement substrates. In 1987 highest viability occurred from late June through mid August with peak settlement occurring from mid June through late August. In 1988 viable eggs were recorded from late July through the end of August; major settlement occurred from early August through mid September. Fishery independent estimates of oyster population abundance on Horsehead Reef, when combined with concurrent egg production and viability data, illustrate the losses that occur during the early life history stages of oysters in this location