Effect of lighting programme and nursing method on the production and nursing behaviour of rabbit does

[EN] The purpose of the experiment was to analyse how the production and nursing behaviour of rabbit does are influenced by different lighting programmes and nursing methods. Rabbit does (n=119) were housed in two rooms. The lighting schedules were a continuous 16L:8D (16L, n=55) or an interrupted 8L:4D:8L:4D (8+8L, n=64). In both rooms, half of the does nursed their kits freely (FS, n=53), while for the other half the suckling method was changed to controlled nursing 3 days prior to the artificial insemination (AI) at day 11 (FS-CS, n=66). Lighting schedule had no significant effect on any productive trait. 76% of the 16L does nursed their kits during the dark period; however, in the 8+8L group, 50% of the nursing events occurred in the dark, 50% during the light periods, respectively. Thus the intermittent lighting disturbed the nursing behaviour of the does. The nursing method significantly affected several traits. AI/parturition, body weight of the does at kindling, number of kits born alive, litter weight at day 21, and suckling mortality were 1.38 and 1.24 (P<0.05), 4.51 and 4.37 kg (P<0.01), 7.95 and 8.46 (P<0.05), 3.06 and 2.92 kg (P<0.05), and 5.3 and 7.3% (P<0.05) in the FS and FS-CS groups, respectively. Compared to the FS group, the advantage of the FS-CS group (P<0.001) was 16.2, 18.4, 9.3 and, 6.3% for total number of kits born, number of kits born alive, number of kits at day 21, and total kits¿ weight at day 21 per AI, respectively. Due to the change in the nursing method, the frequency of multiple nursing increased. The length of the nursing period of the FS-CS group was significantly exceeded by that of the FS does. Based on these results, changing the nursing method can be used as an adequate biostimulation method.Financial help from TECH_08_A3/2-2008-0384, NDA (National Development Agency) is gratefully acknowledged.Gerencsér, Z.; Matics, Z.; Nagy, I.; Radnai, I.; Szendrõ, É.; Szendrõ, Z. (2012). Effect of lighting programme and nursing method on the production and nursing behaviour of rabbit does. World Rabbit Science. 20(2):103-116. doi:10.4995/wrs.2012.1078SWORD10311620

An alternative model for the origin of gaps in circumstellar disks

Motivated by recent observational and numerical studies suggesting that collapsing protostellar cores may be replenished from the local environment, we explore the evolution of protostellar cores submerged in the external counter-rotating environment. These models predict the formation of counter-rotating disks with a deep gap in the gas surface density separating the inner disk (corotating with the star) and the outer counter-rotating disk. The properties of these gaps are compared to those of planet-bearing gaps that form in disks hosting giant planets. We employ numerical hydrodynamics simulations of collapsing cores that are replenished from the local counter-rotating environment, as well as numerical hydrodynamic simulations of isolated disks hosting giant planets, to derive the properties of the gaps that form in both cases. Our numerical simulations demonstrate that counter-rotating disks can form for a wide range of mass and angular momentum available in the local environment. The gap that separates both disks has a depletion factor smaller than 1%, can be located at a distance from ten to over a hundred AU from the star, and can propagate inward with velocity ranging from 1 AU/Myr to >100 AU/Myr. Unlike our previous conclusion, the gap can therefore be a long-lived phenomenon, comparable in some cases to the lifetime of the disk itself. For a proper choice of the planetary mass, the viscous \alpha-parameter and the disk mass, the planet-bearing gaps and the gaps in counter-rotating disks may show a remarkable similarity in the gas density profile and depletion factor, which may complicate their observational differentiation.Comment: 13 pages, 13 figures, accepted for publication in Astronomy & Astrophysic

Surface Structure Analysis of Syntactic Metal Foams Machined by Milling

In the automotive and aerospace industries the engineers are encouraged to develop new materials, having special features mainly for the purposes of mass reduction, favourable (specifi) mechanical properties, appropriate strength, heat resistance, and environmental impacts, becoming even more critical technically. The matrix of the metal matrix composite, being the subject of our research, is an AlMgSi1 aluminum alloy: it contains 50-55 volume per cent of Al2O3 particles as reinforcement, having an average diameter of 100 - 150 μm. After machining, the surface of materials, having such large particles, is divided by open cavities, therefore other methods have to be used in order to describe and characterise the surface structure than in the case of steel or aluminum components, having a homogeneous structure. In our present article the aim is to analyse the microgeometrical properties of the surface of metal matrix composite materials, produced to the tests and machined with shoulder milling; furthermore, the measures, being able to evaluate the produced surface in an exact way, will be determined

Flying under the radar:CDH2 (N-cadherin), an important hub molecule in neurodevelopmental and neurodegenerative diseases

CDH2 belongs to the classic cadherin family of Ca(2+)-dependent cell adhesion molecules with a meticulously described dual role in cell adhesion and β-catenin signaling. During CNS development, CDH2 is involved in a wide range of processes including maintenance of neuroepithelial integrity, neural tube closure (neurulation), confinement of radial glia progenitor cells (RGPCs) to the ventricular zone and maintaining their proliferation-differentiation balance, postmitotic neural precursor migration, axon guidance, synaptic development and maintenance. In the past few years, direct and indirect evidence linked CDH2 to various neurological diseases, and in this review, we summarize recent developments regarding CDH2 function and its involvement in pathological alterations of the CNS

Exact Insulating and Conducting Ground States of a Periodic Anderson Model in Three Dimensions

We present a class of exact ground states of a three-dimensional periodic Anderson model at 3/4 filling. Hopping and hybridization of d and f electrons extend over the unit cell of a general Bravais lattice. Employing novel composite operators combined with 55 matching conditions the Hamiltonian is cast into positive semidefinite form. A product wave function in position space allows one to identify stability regions of an insulating and a conducting ground state. The metallic phase is a non-Fermi liquid with one dispersing and one flat band.Comment: 4 pages, 3 figure

VLBI observations of a flared optical quasar CGRaBS J0809+5341

A bright optical flare was detected in the high-redshift ($z=2.133$) quasar CGRaBS J0809+5341 on 2014 April 13. The absolute magnitude of the object reached $-30.0$ during the flare, making it the brightest one (in flaring stage) among all known quasars so far. The 15 GHz flux density of CGRaBS J0809+5341 monitored in the period from 2008 to 2016 also reached its peak at the same time. To reveal any structural change possibly associated with the flare in the innermost radio structure of the quasar, we conducted a pilot very long baseline interferometry (VLBI) observation of CGRaBS J0809+5341 using the European VLBI Network (EVN) at 5 GHz on 2014 November 18, about seven months after the prominent optical flare. Three epochs of follow-up KaVA (Korean VLBI Network and VLBI Exploration of Radio Astrometry Array) observations were carried out at 22 and 43 GHz frequencies from 2015 February 25 to June 4, with the intention of exploring a possibly emerging new radio jet component associated with the optical flare. However, these high-resolution VLBI observations revealed only the milliarcsecond-scale compact "core" that was known in the quasar from earlier VLBI images, and showed no sign of any extended jet structure. Neither the size, nor the flux density of the "core" changed considerably after the flare according to our VLBI monitoring. The results suggest that any putative radio ejecta associated with the major optical and radio flare could not yet be separated from the "core" component, or the newly-born jet was short-lived.Comment: 4 figures, 2 tables, accepted for publication in PAS

Review on Networks Defined by Software

Heretofore, most network equipment had to be configured individually by connecting manually into it. This approach is time consuming for large networks and prone to human errors. The Software Defined Networking paradigm defines several standards and protocols in order to read the network states and act on its configuration from distant servers. These protocols authorize a reconfiguration of the network in a centralized way by the use of transactions that acts on one or more devices. In general, transactions are implemented as APIs for use by third- party programs and on software components separate from the orchestrator called controllers for more modularity. Nowadays, SDN receives a lot of interest from researchers and manufacturers aiming for the modernization of the networks especially with the emergence of the loT, 5G and WAN technologies