990 resultados para David V. Pavesic


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David Brown takes a road trip to Canberra for the Roach fixture at the High Court where modernity is attempting a fight-back against the resurrection of civil death. With echoes of Hunter S Thompson as rugby league follower, the author recounts a trip to Canberra to observe a case in which Vickie Lee Roach, an Indigenous woman prisoner, challenged (successfully as it later turns out) the Howard government's 2006 legislation disenfranchising all serving prisoners.

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Background The genetic mutation resulting in osteogenesis imperfecta (OI) type V was recently characterised as a single point mutation (c.-14C > T) in the 5' untranslated region (UTR) of IFITM5, a gene encoding a transmembrane protein with expression restricted to skeletal tissue. This mutation creates an alternative start codon and has been shown in a eukaryotic cell line to result in a longer variant of IFITM5, but its expression has not previously been demonstrated in bone from a patient with OI type V. Methods Sanger sequencing of the IFITM5 5' UTR was performed in our cohort of subjects with a clinical diagnosis of OI type V. Clinical data was collated from referring clinicians. RNA was extracted from a bone sample from one patient and Sanger sequenced to determine expression of wild-type and mutant IFITM5. Results: All nine subjects with OI type V were heterozygous for the c.-14C > T IFITM5 mutation. Clinically, there was heterogeneity in phenotype, particularly in the manifestation of bone fragility amongst subjects. Both wild-type and mutant IFITM5 mRNA transcripts were present in bone. Conclusions The c.-14C > T IFITM5 mutation does not result in an RNA-null allele but is expressed in bone. Individuals with identical mutations in IFITM5 have highly variable phenotypic expression, even within the same family.

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El presente trabajo se realizó en la Finca Surco Muerto, Municipio de Sébaco–Matagalpa en el período comprendido de Julio a octubre del 2004, con la finalidad de evaluar diferentes productos fungicidas sistémicos (Phyton 0.5 L. ha-1, Benomil 0.5 kg ha-1 y Curzate 2 kg ha-1) y preventivos (Mancozeb 2 kg ha-1 y Clorotalonil 2 L. ha-1) en el manejo de enfermedades foliares en tomate. El diseño establecido fué el de Bloques Completos al Azar (BCA),con siete tratamientos y cuatro repeticiones. Los resultados indican que el efecto de los tratamientos evaluados sobre el control de Alternaria solani enlas primeras fechas no demuestran diferencia estadística, hasta los 62 días después del trasplante (ddt), donde Clorotalonil se comportó como el mejor tratamiento en protección al follaje.Para la variable severidad de Xanthomonas campestris en follaje los resultados indican, que es a partir de los 78 ddt donde los tratamientos demuestran diferencia estadística, comportándose Phyton como el mejor tratamiento para el manejo de dicha enfermedad.El cultivo también fué fuerte mente afectado por Mosca blanca(Bemisia tabaciGenn.) lo que repercutió en porcentajes de severidad de virosis muy altos(92%),enmascarando un mejor efecto que pudieron haber tenido los tratamientos evaluados. Enrelación a las variables de rendimiento analizadas por contrastes ortogonales, para la variable peso de frutos buenos, el análisis no encontró diferencias estadísticas entre los grupos evaluados.Para la variable peso de frutos afectados por Alternaria el análisis detectó diferencias estadísticas entre los grupos evaluados donde el grupo de los Preventivos (Clorotalonil y Mancozeb) ejercieron mejor control para dicho patógeno por haberse obtenido con ellos los más bajos rendimientos afectados con 40.85 kg ha-1. En la variable peso de frutos afectados por Xanthomonas Campestris pvvesicatoria el análisis no encontró diferencias estadísticas entre los grupos comparados.Para el rendimiento real el análisis encontró diferencias estadísticas, donde demuestra que son los tratamientos preventivos (Mancozeb y Clorotalonil) los que ejercieron el mejor control con el más alto rendimiento 5658.56 kg ha-1.Los resultados del análisis económico indican que el tratamiento rentable es Mancozeb, por obtenerse con el una tasa de retorno marginal de 960.25%. En condiciones de bajo rendimiento es Alternado (Curzate + Clorotalonil +Mancozeb) el tratamiento rentable por obtenerse con el una TRM de 246.95%. Al realizar el análisis de sensibilidad los resultados demuestran que la aplicación de Mancozeb es justificable; aun cuando el precio del tomate disminuye en un 70%, de su precio original,ya que con precios bajos se obtiene una TRM de 1.98%.

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A concise synthetic route to the tunicamycin antibiotics is described, illustrated by the preparation of (+)-tunicamycin-V (1-V). Key features of the synthesis include: (1) the development and application of a silicon-mediated reductive coupling of aldehydes and allylic alcohols to construct the undecose core of the natural product; and (2) the development of an efficient procedure for the synthesis of the trehalose glycosidic bond within the antibiotic. These innovations allow for the coupling of a uridine-derived aldehyde fragment with a preformed trehalose-linked disaccharide allylic alcohol to form the carbohydrate core (1) of the natural product in a highly convergent manner. The resultant amino polyol is a versatile intermediate for the synthesis of any of the homologous tunicamycin antibiotics.

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The structure and properties of the diffuse interstellar medium (ISM) on small scales, sub-au to 1 pc, are poorly understood. We compare interstellar absorption-lines, observed towards a selection of O- and B-type stars at two or more epochs, to search for variations over time caused by the transverse motion of each star combined with changes in the structure in the foreground ISM. Two sets of data were used: 83 VLT- UVES spectra with approximately 6 yr between epochs and 21 McDonald observatory 2.7m telescope echelle spectra with 6 - 20 yr between epochs, over a range of scales from 0 - 360 au. The interstellar absorption-lines observed at the two epochs were subtracted and searched for any residuals due to changes in the foreground ISM. Of the 104 sightlines investigated with typically five or more components in Na I D, possible temporal variation was identified in five UVES spectra (six components), in Ca II, Ca I and/or Na I absorption-lines. The variations detected range from 7\% to a factor of 3.6 in column density. No variation was found in any other interstellar species. Most sightlines show no variation, with 3{\sigma} upper limits to changes of the order 0.1 - 0.3 dex in Ca II and Na I. These variations observed imply that fine-scale structure is present in the ISM, but at the resolution available in this study, is not very common at visible wavelengths. A determination of the electron densities and lower limits to the total number density of a sample of the sightlines implies that there is no striking difference between these parameters in sightlines with, and sightlines without, varying components.