8,010 research outputs found
alpha-xone/xbbg: Custom config and etc. for reference exchange (author hceh)
No full textIntuitive Bloomberg data AP
Pathogenesis of Ectopic Pregnancy: Is there a Role for the Endocannabinoid System in Modulating Embryo-Tubal Transport?
No full textBackground: The molecular mechanisms of ectopic pregnancy remain unclear. Studies from knockout mice suggest that perturbations in oviductal endocannabinoid levels, endocannabinoid receptors (CB1) or endocannabinoid degrading enzyme (fatty acid amide hydrolase, FAAH) expression result in infertility secondary to physical trapping of embryos in their oviducts. Perturbations in endocannabinoid metabolism and action may therefore underlie ectopic pregnancy.
Aims: To (1) quantify plasma and tubal endocannabinoid levels (2) evaluate blood activity of FAAH and the endocannabinoid degrading enzyme N-acylphosphatidyl-ethanolamine phospholipase-D (NAPE-PLD) and relate that to β-hCG levels (3) evaluate the expression of cannabinoid receptors (CB1, CB2), FAAH and NAPE-PLD in Fallopian tubes and (4) examine the effect of endocannabinoids [N-arachidonoylethanolamine (AEA), N-oleoylethanolamide (OEA) and N-palmitoylethanolamide (PEA)] on cilia beat frequency (CBF) in tubal epithelial cells ex-vivo.
Methods: Whole blood collected from women with ectopic pregnancy and suitable controls were used for quantification of endocannabinoids by UHPLCMS/MS and FAAH and NAPE-PLD activity by HPLC methods. Fallopian tubes were fixed in formalin for immunohistochemistry and had RNA and protein extracted for RT-qPCR and immunoblotting respectively. Fallopian tube explants were exposed to endocannabinoids and changes in CBF evaluated using highspeed digital camera.
Results: Plasma AEA, OEA, PEA and tubal AEA were significantly higher (p < 0.05) in ectopic pregnancy compared to controls. Tubal OEA and PEA showed a similar trend though the results were not statistically significant. Blood FAAH but not NAPE-PLD activity was attenuated (p < 0.05) in ectopic pregnant women consistent with the higher endocannabinoid level observed in plasma. CB1 and FAAH were localised in Fallopian tube and showed significant attenuation (p < 0.05) in ectopic pregnancy compared to luteal phase controls. Exposure of Fallopian tube epithelial cells to OEA unlike methanandamide and PEA resulted in a significant reduction (p < 0.05) in CBF.
Conclusion: The results implicate ECS dysfunction in the pathogenesis of ectopic pregnancy
Functional Characterisation of Alpha-Galactosidase A Mutations as a Basis for a New Classification System in Fabry Disease
No full textThis is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.The study has been supported partially by an unrestricted scientific grant from Shire Human Genetic Therapies (Germany
The IPHAS catalogue of H alpha emission-line sources in the northern Galactic plane
No full textWe present a catalogue of point-source H alpha emission-line objects selected from the INT/WFC Photometric Ha Survey (IPHAS) of the northern Galactic plane. The catalogue covers the magnitude range 13 <= r' <= 19.5 and includes Northern hemisphere sources in the Galactic latitude range -5 degrees < b < 5 degrees. It is derived from similar to 1500 deg(2) worth of imaging data, which represents 80 per cent of the final IPHAS survey area. The electronic version of the catalogue will be updated once the full survey data become available. In total, the present catalogue contains 4853 point sources that exhibit strong photometric evidence for Ha emission. We have so far analysed spectra for similar to 300 of these sources, confirming more than 95 per cent of them as genuine emission-line stars. A wide range of stellar populations are represented in the catalogue, including early-type emission-line stars, active late-type stars, interacting binaries, young stellar objects and compact nebulae.
The spatial distribution of catalogue objects shows overdensities near sites of recent or current star formation, as well as possible evidence for the warp of the Galactic plane. Photometrically, the incidence of Ha emission is bimodally distributed in (r' - i'). The blue peak is made up mostly of early-type emission-line stars, whereas the red peak may signal an increasing contribution from other objects, such as young/active low-mass stars. We have cross-matched our H alpha-excess catalogue against the emission-line star catalogue of Kohoutek & Wehmeyer, as well as against sources in SIMBAD. We find that fewer than 10 per cent of our sources can be matched to known objects of any type. Thus IPHAS is uncovering an order of magnitude more faint (r' > 13) emission-line objects than were previously known in the Milky Way
Copper-Catalyzed Addition of Alkylboranes to Iminoacetates: Access to alpha-Alkyl Branched alpha-Amino Acids
No full textA copper(I)-catalyzed addition of alkylborane reagents to alpha-iminoacetates has been developed to assemble both acyclic and cyclic alpha-branched alpha-amino carboxylic acid derivatives in good yields. A wide variety of unactivated alkenes are well tolerated in this transformation
Formation of Chiral alpha-Monofluorinated-beta-amino Esters through Organocatalytic Asymmetric Reduction of alpha-Fluoro-beta-enamino Esters by Trichlorosilane
No full textA concise method was developed to prepare chiral alpha-monofluorinated-beta-amino esters through N-sulfinyl urea catalyzed asymmetric hydrosilylation of alpha-fluoro-beta-enamino esters, which affords high yields, good to high diastereoselectivities (up to>99/1), and moderate to good enantioselectivities (up to 83% ee)
Kraichnan-Leith-Batchelor similarity theory and two-dimensional inverse cascades
No full textWe study the scaling properties and Kraichnan-Leith-Batchelor (KLB) theory of forced inverse cascades in generalized two-dimensional (2D) fluids (-turbulence models) simulated at resolution . We consider (surface quasigeostrophic flow), (2D vorticity dynamics) and . The forcing scale is well-resolved, a direct cascade is present and there is no large-scale dissipation. Coherent vortices spanning a range of sizes, most larger than the forcing scale, are present for both and . The active scalar field for contains comparatively few and small vortices. The energy spectral slopes in the inverse cascade are steeper than the KLB prediction in all three systems. Since we stop the simulations well before the cascades have reached the domain scale, vortex formation and spectral steepening are not due to condensation effects; nor are they caused by large-scale dissipation, which is absent. One- and two-point pdfs, hyperflatness factors and structure functions indicate that the inverse cascades are intermittent and non-Gaussian over much of the inertial range for and , while the inverse cascade is much closer to Gaussian and non-intermittent. For the steep spectrum is close to that associated with enstrophy equipartition. Continuous wavelet analysis shows approximate KLB scaling () and () in the interstitial regions between the coherent vortices. Our results demonstrate that coherent vortex formation ( and ) and non-realizability () cause 2D inverse cascades to deviate from the KLB predictions, but that the flow between the vortices exhibits KLB scaling and non-intermittent statistics for and . The results will appear in \cite{BurgessEA2015}, which has been accepted to the \emph{Journal of Fluid Mechanics}
- …
