Genetic and antigenic characterization of Bungowannah virus, a novel pestivirus.

Bungowannah virus, a possible new species within the genus Pestivirus, has been associated with a disease syndrome in pigs characterized by myocarditis with a high incidence of stillbirths. The current analysis of the whole-genome and antigenic properties of this virus confirms its unique identity, and further suggests that this virus is both genetically and antigenically remote from previously recognized pestiviruses. There was no evidence of reactivity with monoclonal antibodies (mAbs) that are generally considered to be pan-reactive with other viruses in the genus, and there was little cross reactivity with polyclonal sera. Subsequently, a set of novel mAbs has been generated which allow detection of Bungowannah virus. The combined data provide convincing evidence that Bungowannah virus is a member of the genus Pestivirus and should be officially recognized as a novel virus species.

A novel non-overlapping bi-clustering algorithm for network generation using living cell array data.

MOTIVATION: The living cell array quantifies the contribution of activated transcription factors upon the expression levels of their target genes. The direct manipulation of the regulatory mechanisms offers enormous possibilities for deciphering the machinery that activates and controls gene expression. We propose a novel bi-clustering algorithm for generating non-overlapping clusters of reporter genes and conditions and demonstrate how this information can be interpreted in order to assist in the construction of transcription factor interaction networks.

Identification of a novel virus in pigs--Bungowannah virus: a possible new species of pestivirus.

In 2003 an outbreak of sudden deaths occurred in 3-4-week-old piglets on a farm in New South Wales, Australia. There was a marked increase in the birth of stillborn foetuses. Pathological changes consisted of a multifocal non-suppurative myocarditis. A viral infection was suspected but a wide range of known agents were excluded. A modified sequence independent single primer amplification (SISPA) method was used to identify a novel virus associated with this outbreak. Conserved 5'UTR motifs, the presence of a putative N(pro) coding region and limited antigenic cross-reactivity with other members of the Pestivirus genus, support the placement of this virus in the Pestivirus genus. Phylogenetic analysis of the 5'UTR, N(pro) and E2 coding regions showed this virus to be the most divergent pestivirus identified to date.

On the investigation of homeopathic potencies using low resolution NMR T2 relaxation times: an experimental and critical survey of the work of Roland Conte et al.

We have attempted to reproduce differences in low resolution nuclear magnetic resonance (NMR) T2 spin-spin relaxation times between homeopathically potentised and unpotentised Nitric acid (nit-ac) solutions previously reported by Conte, et al. Using similar instrumentation and experimental protocols, we have shown that it is likely that Conte's original results are attributable to experimental artifact originating in the glassware used for the manufacture of the NMR tubes.

On the investigation of homeopathic potencies using low resolution NMR T2 relaxation times: an esperimental and critical survey of the work of Roland Conte et al

We have attempted to reproduce differences in low resolution nuclear magnetic rosonance (NMR) T2 spin-spin relacation times between homeopathically potentised and unpotentised Nitric acid (nit-ac) solutions previously reported by Conte, et al. Using silimar instrumentation and ... (AU)

Colonic mucins in ulcerative colitis: evidence for loss of sulfation.

Colonic tissue obtained at surgery from control individuals and patients with ulcerative colitis was used to isolate mucins and to prepare mucin glycopolypeptides by pronase digestion. These were compared with mucins labelled with [35S] sulfate and [3H]-glucosamine after organ culture tissue samples from the same patients. A significant loss of mucin sulfation was detected in the colitis patients by both metabolic labelling and chemical analysis of the glycopolypeptides. A change in the size distribution of purified mucin oligosaccharides fractionated on BioGel P6 after release by beta-elimination was seen in both radiolabelled and non-labelled colitis mucins compared with controls. Amino acid analysis of the glycopolypeptides showed a close similarity to the expected ratio of serine:threonine:proline for MUC2 and did not vary between control and colitis groups. Analysis of the mucins confirmed > 90% purity in the labelling experiments, characteristic behaviour on density gradient centrifugation and agarose gel electrophoresis in control and ulcerative colitis groups and differences in sulfation and turnover at various sites in the normal colon.

Acetate metabolism in the mammary gland of the lactating ewe.

Acetate metabolism in the mammary gland of lactating ewes was studied by continuous infusion of radioisotopic [U-14C]sodium acetate and measurement of mammary gland arteriovenous difference and blood flow. Entry rate of acetate into the whole body averaged 75 +/- 7 mumol min-1 kg-1 liveweight and 22.1 +/- 2.7% of total CO2 production was derived from acetate. Acetate was both utilized and produced by the mammary gland. Acetate uptake was related linearly (r2 = 0.94) to arterial concentration and gross utilization of acetate accounted for 16.2 +/- 2.6% of whole-body entry rate. Endogenous acetate production by the mammary gland increased linearly (r2 = 0.90) as milk yield rose, and accounted for 25.6 +/- 2.7% of the gross mammary utilization of acetate. The proportion of mammary CO2 derived from acetate (22.5 +/- 3.9%) was similar to that of the whole body. The uptake of acetate, 3-hydroxybutyrate, esterified fatty acids and plasma free fatty acids accounted for about 25, 13, 60 and 4% of milk fatty acid carbon respectively, after correction for the oxidation of acetate, but not of the other substrates. Metabolism of acetate in the mammary glands of lactating ewes appears quantitatively more important than that in cows, but similar to that in goats.

Sensory and metabolic feedback in the modulation of taste hedonics.

One hundred and twenty-five college students were fed a small preload composed of common foods which were either solid or liquid, sweet or non-sweet, and high or low in energy content. At 15-minute intervals following the preload subjects rated the intensity and pleasantness of of either sweet or a non-sweet test stimulus. Pleasantness reductions (alliesthesia) were observed following all preloads but were significantly larger in the high-calorie groups. In addition, solid preloads were found to provoke greater hedonic shifts than liquid preloads. While intensity ratings paralleled those for pleasantness, no correlation between the two was apparent. The results point to a metabolic explanation for the hedonic declines in the test stimuli. Nutrient (perhaps carbohydrate) detectors in the upper GI tract are proposed to trigger both central and peripheral changes which underlie the changes in pleasantness and intensity judgements.