Effect in ewes of oestrogen priming and GnRH on LH release and luteal function during early lactation in spring

No Abstrac

Two decades of pulsar timing of Vela

Pulsar timing at the Mt Pleasant observatory has focused on Vela, which can be tracked for 18 hours of the day. These nearly continuous timing records extend over 24 years allowing a greater insight into details of timing noise, micro glitches and other more exotic effects. In particular we report the glitch parameters of the 2004 event, along with the reconfirmation that the spin up for the Vela pulsar occurs instantaneously to the accuracy of the data. This places a lower limit of about 30 seconds for the acceleration of the pulsar to the new rotational frequency. We also confirm of the low braking index for Vela, and the continued fall in the DM for this pulsar.Comment: Isolated Neutron Stars conference, London, April 24-28 200

Soliton bound states in semiconductor disk laser

We report what we believe is the first demonstration of a temporal soliton bound state in semiconductor disk laser. The laser was passively mode-locked using a quantum dot based semiconductor saturable absorber mirror (QD-SESAM). Two mode-locking regimes were observed where the laser would emit single or closely spaced double pulses (soliton bound state regime) per cavity round-trip. The pulses in soliton bound state regime were spaced by discrete, fixed time duration. We use a system of delay differential equations to model the dynamics of our device

UK Geoenergy Observatories, Glasgow environmental baseline soil chemistry dataset

This report describes the environmental baseline topsoil chemistry dataset collected in February-March 2018 (03-18) as part of the United Kingdom Geoenergy Observatories (UKGEOS) project. Ninety, samples were collected from the shallow coal-mine Glasgow Geothermal Energy Research Field Site (GGERFS). The report accompanies the GGERFS Soil Chemistry03-18 dataset. It provides valuable information on soil chemistry prior to installation of the GGERFS-facility boreholes, against which any future change during the development/ running of the facility can be assessed. This information is necessary to help understand and de-risk similar shallow geothermal schemes in the future, provide public reassurance, and inform sustainable energy policy

The Genetic Age: Who Owns the Genome?: A Symposium on Intellectual Property and the Human Genome, 2 J. Marshall Rev. Intell. Prop. L. 6 (2002)

A Symposium on Intellectual Property Co-Sponsored by The Woodrow Wilson Center. Featuring the remarks of Scott A. Brown, J.D.; Q. Todd Dickinson, J.D.; Stephen P.A. Fodor, Ph.D.; Justin Gillis; Hon. Lee H. Hamilton; Eric S. Lander, Ph.D.; and Pilar Ossorio, Ph.D., J.D

Rotation measure variations for 20 millisecond pulsars

We report on variations in the mean position angle of the 20 millisecond pulsars being observed as part of the Parkes Pulsar Timing Array (PPTA) project. It is found that the observed variations are dominated by changes in the Faraday rotation occurring in the Earth's ionosphere. Two ionospheric models are used to correct for the ionospheric contribution and it is found that one based on the International Reference Ionosphere gave the best results. Little or no significant long-term variation in interstellar RM was found with limits typically about 0.1 rad m$^{-2}$ yr$^{-1}$ in absolute value. In a few cases, apparently significant RM variations over timescales of a few 100 days or more were seen. These are unlikely to be due to localised magnetised regions crossing the line of sight since the implied magnetic fields are too high. Most probably they are statistical fluctuations due to random spatial and temporal variations in the interstellar electron density and magnetic field along the line of sight.Comment: Accepted for publication in Astrophysics & Space Scienc

The Magnetic Field of the Solar Corona from Pulsar Observations

We present a novel experiment with the capacity to independently measure both the electron density and the magnetic field of the solar corona. We achieve this through measurement of the excess Faraday rotation due to propagation of the polarised emission from a number of pulsars through the magnetic field of the solar corona. This method yields independent measures of the integrated electron density, via dispersion of the pulsed signal and the magnetic field, via the amount of Faraday rotation. In principle this allows the determination of the integrated magnetic field through the solar corona along many lines of sight without any assumptions regarding the electron density distribution. We present a detection of an increase in the rotation measure of the pulsar J1801$-$2304 of approximately 160 \rad at an elongation of 0.95$^\circ$ from the centre of the solar disk. This corresponds to a lower limit of the magnetic field strength along this line of sight of $> 393\mu\mathrm{G}$. The lack of precision in the integrated electron density measurement restricts this result to a limit, but application of coronal plasma models can further constrain this to approximately 20mG, along a path passing 2.5 solar radii from the solar limb. Which is consistent with predictions obtained using extensions to the Source Surface models published by Wilcox Solar ObservatoryComment: 16 pages, 4 figures (1 colour): Submitted to Solar Physic

Prolonged treadmill running in normobaric hypoxia causes gastrointestinal barrier permeability and elevates circulating levels of pro- and anti-inflammatory cytokines

PURPOSE: This study examined the impact of treadmill running in normobaric hypoxia on gastrointestinal barrier permeability and the systemic inflammatory response. METHODS: Ten recreationally-active participants completed two 1h bouts of matched-workload treadmill exercise(65% normoxic VO2max) in counterbalanced order. One bout was performed in normoxia(NORM: FIO2=20.9%) and the other in normobaric hypoxia(HYP: FIO2=13.5%). Minute ventilation(VE), respiratory rate(RR), tidal volume(VT), oxygen consumption(VO2), carbon dioxide production(VCO2), respiratory quotient(RQ), and heart rate(HR) were measured with a metabolic cart. Peripheral oxygen saturation(SpO2) was measured with pulse oximetry. Absolute tissue saturation(StO2) was measured with near-infrared spectroscopy. Fatty acid-binding protein(I-FABP) and circulating cytokine concentrations(IL-1Ra, IL-6, IL-10, TNFα) were assayed from plasma samples collected Pre, Post, 1h-Post, and 4h-Post exercise. Data were analyzed with 2-Way(Condition*Time) RM ANOVAs and Newman-Keuls post hocs were run where appropriate(p<0.05). RESULTS: As compared to NORM, 1h of treadmill exercise in HYP caused greater(p<0.05) changes in VE(+30%), RR(+16%), VT(+10%), VCO2(+18%), RQ(+16%), HR(+4%), SpO2(-16%) and StO2(-10%). Gut barrier permeability and circulating cytokine concentrations were also greater(p<0.05) following HYP exercise, where I-FABP was shown increased at Post(+68%) and IL-1Ra at 1h-Post(+266%). IFABP and IL-1Ra did not change following NORM exercise. IL-6 and IL-10 increased with exercise in both study conditions but were increased more(p<0.05) following HYP exercise at Post(+705% and +127%; respectively) and 1h-Post(+400% and +128%; respectively). KEY FINDINGS: Normobaric hypoxia caused significant desaturation and increased most cardiopulmonary responses by 10-30%. Significant gut barrier permeability and increased pro- and anti-inflammatory cytokine concentrations could promote an "open window" in the hours following HYP exercise

Heteroepitaxial Beta-Ga2O3 on 4H-SiC for an FET With Reduced Self Heating

A method to improve thermal management of β-Ga 2 O 3 FETs is demonstrated here via simulation of epitaxial growth on a 4H-SiC substrate. Using a recently published device as a model, the reduction achieved in self-heating allows the device to be driven at higher gate voltages and increases the overall performance. For the same operating parameters an 18% increase in peak drain current and 15% reduction in lattice temperature are observed. Device dimensions may be substantially reduced without detriment to performance and normally off operation may be achieved

Allaeochelys libyca, a new carettochelyine turtle from the middle miocene (Langhian) of Libya

Fossil carettochelyine turtles are well known from the Paleogene of Europe (Allaeochelys), North America and Asia (Anosteira); however, the previously known Neogene fossil record is highly fragmentary and was therefore unsuitable for taxonomic analysis. In this work, we present a new carettochelyine taxon, Allaeochelys libyca, from the Middle Miocene (Langhian) of Gebel Zelten (Libya) based on an incomplete skull and disarticulated postcranial elements. The new taxon is diagnosed relative to the extant Carettochelys insculpta based on the placement of the foramen posterius canalis carotici interni close to the fenestra postotica, the horizontal orientation of the tubercula basioccipitalis, the substantial contribution of the opisthotic to the base of the tubercula basioccipitalis, the presence of a triangular pterygoid fossa, the arrangement of the mandibular condyles along a plane and the presence of an extremely well-developed fossa at the base of the processus mandibularis. A phylogenetic analysis of pancarettochelyids confirms the monophyly of Carettochelyidae and Carettochelyinae but resulted in a paraphyletic taxon, Allaeochelys. For the sake of nomenclatural stability, we provisionally retain the genus Allaeochelys as paraphyletic relative to the extant Carettochelys insculpta