ON INTERACTION BETWEEN FALLING BODIES AND THE SURROUNDING FLUID

Interactions between a finite number of bodies and the surrounding fluid, in a channel for instance, are investigated theoretically. In the planar model here the bodies or modelled grains are thin solid bodies free to move in a nearly parallel formation within a quasi-inviscid fluid. The investigation involves numerical and analytical studies and comparisons. The three main features that appear are a linear instability about a state of uniform motion, a clashing of the bodies (or of a body with a side wall) within a finite scaled time when nonlinear interaction takes effect, and a continuum-limit description of the body–fluid interaction holding for the case of many bodies

Molecular gas in nearby powerful radio galaxies

We report the detection of CO(1-0) and CO(2-1) emission from the central region of nearby 3CR radio galaxies (z$<$ 0.03). Out of 21 galaxies, 8 have been detected in, at least, one of the two CO transitions. The total molecular gas content is below 10$^9$ \msun. Their individual CO emission exhibit, for 5 cases, a double-horned line profile that is characteristic of an inclined rotating disk with a central depression at the rising part of its rotation curve. The inferred disk or ring distributions of the molecular gas is consistent with the observed presence of dust disks or rings detected optically in the cores of the galaxies. We reason that if their gas originates from the mergers of two gas-rich disk galaxies, as has been invoked to explain the molecular gas in other radio galaxies, then these galaxies must have merged a long time ago (few Gyr or more) but their remnant elliptical galaxies only recently (last 10$^7$ years or less) become active radio galaxies. Instead, we argue the the cannibalism of gas-rich galaxies provide a simpler explanation for the origin of molecular gas in the elliptical hosts of radio galaxies (Lim et al. 2000). Given the transient nature of their observed disturbances, these galaxies probably become active in radio soon after the accretion event when sufficient molecular gas agglomerates in their nuclei.Comment: 6 pages, including 2 figures,in "QSO Hosts and Their Environments", ed. I. Marquez, in pres

The impact of developmental dyslexia on workplace cognition: Evidence from a virtual reality environment

The cognitive difficulties associated with dyslexia persist into adulthood but insights into their impact in employment settings are lacking. A virtual office environment was used to assess two areas of cognition frequently called upon in the workplace, executive function and prospective memory. Eight adults with dyslexia and 27 adults without dyslexia were tested on a virtual office task. They read a scenario describing their new role in an office and were given tasks to complete. The group with dyslexia performed worse overall. On the individual performance measures, the group with dyslexia scored lower on the selective-thinking and planning measures of executive function and also performed worse on two of the three prospective memory measures, namely event-based and time-based prospective memory. The findings indicate how dyslexia can affect workplace cognition, identifying areas in which support might be needed and highlighting areas of relative strength which might be harnessed

The impact of developmental dyslexia on workplace cognition: evidence from a virtual reality environment

The cognitive difficulties associated with dyslexia persist into adulthood but insights into their impact in employment settings are lacking. A virtual office environment was used to assess two areas of cognition frequently called upon in the workplace, executive function and prospective memory. Eight adults with dyslexia and 27 adults without dyslexia were tested on a virtual office task. They read a scenario describing their new role in an office and were given tasks to complete. The group with dyslexia performed worse overall. On the individual performance measures, the group with dyslexia scored lower on the selective-thinking and planning measures of executive function and also performed worse on two of the three prospective memory measures, namely event-based and time-based prospective memory. The findings indicate how dyslexia can affect workplace cognition, identifying areas in which support might be needed and highlighting areas of relative strength which might be harnessed

Théâtre impérial de l’Opéra: seconde représentation de Tannhaüser

Transcript of THÉÂTRE IMPÉRIAL DE L’OPÉRA: SECONDE REPRÉSENTATION DE TANNHÄUSER, by Édouard Monnais, writing as Paul Smith, appearing in LA REVUE ET GAZETTE MUSICALE DE PARIS, 24 mars 1861

Arginase from kiwifruit: properties and seasonal variation

The in vitro activity of arginase (EC 3.5.3.1) was investigated in youngest-mature leaves and roots (1-3 mm diameter) of kiwifruit vines (Actinidia deliciosa var. deliciosa) during an annual growth cycle, and enzyme from root material partially purified. No seasonal trend in the specific activity of arginase was observed in roots. Measurements in leaves, however, rose gradually during early growth and plateaued c. 17 weeks after budbreak. Changes in arginase activity were not correlated with changes in the concentration of arginine (substrate) or glutamine (likely end-product of arginine catabolism) in either tissue during the growth cycle. Purification was by (NH4)2SO4 precipitation and DEAE-cellulose chromatography. The kinetic properties of the enzyme, purified 60-fold over that in crude extracts, indicated a pH optimum of 8.8, and a Km (L-arginine) of 7.85 mM. Partially-purified enzyme was deactivated by dialysis against EDTA, and reactivated in the presence of Mn²⁺, Co²⁺, and Ni²⁺

Embryonic Development and a Quantitative Model of Programmed DNA Elimination in Mesocyclops Edax (S. A. ) (Copepoda: Cyclopoida)

The highly programmed fragmentation of chromosomes and elimination of large amounts of nuclear DNA from the presomatic cell lineages (i.e., chromatin diminution), occurs in the embryos of the freshwater zooplankton Mesocyclops edax (S. A. Forbes, 1891) (Crustacea: Copepoda). The somatic genome is reorganized and reduced to a size five times smaller even though the germline genome remains intact. We present the first comprehensive, quantitative model of DNA content throughout embryogenesis in a copepod that possesses embryonic DNA elimination. We used densitometric image analysis to measure the DNA content of polar bodies, germline and somatic nuclei, and excised DNA “droplets.” We report: 1) variable DNA contents of polar bodies, some of which do not contain the amount corresponding to the haploid germline genome size; 2) presence of pronuclei in newly laid embryo sacs; 3) gonomeric chromosomes in the second to fourth cleavage divisions and in the primordial germ cell and primordial endoderm cell during the fifth cleavage division; 4) timing of early embryonic cell stages, elimination of DNA, and divisions of the primordial germ cell and primordial endoderm cell at 22∘C role= presentation \u3e22∘C⁠; and 5) persistence of a portion of the excised DNA “droplets” throughout embryogenesis. DNA elimination is a trait that spans multiple embryonic stages and a knowledge of the timing and variability of the associated cytological events with DNA elimination will promote the study of the molecular mechanisms involved in this trait. We propose the “genome yolk hypothesis” as a functional explanation for the persistence of the eliminated DNA that might serve as a resource during postdiminution cleavage divisions

Information Security as Strategic (In)effectivity

Security of information flow is commonly understood as preventing any information leakage, regardless of how grave or harmless consequences the leakage can have. In this work, we suggest that information security is not a goal in itself, but rather a means of preventing potential attackers from compromising the correct behavior of the system. To formalize this, we first show how two information flows can be compared by looking at the adversary's ability to harm the system. Then, we propose that the information flow in a system is effectively information-secure if it does not allow for more harm than its idealized variant based on the classical notion of noninterference

Longitudinal Analysis of the Gill microbiomes of Atlantic Salmon from four Scottish farms reveals dynamics in bacterial richness and seasonal trends in diversity.

Atlantic Salmon aquaculture in Scotland is a major industry being both Scotland, and the UK’s largest food export. Gill disease, in particular Complex Gill Disease, is a significant challenge of salmon production. It is increasingly understood that the microbiome can influence host health and immunity. Therefore, the objective of the study is to identify and characterise the gill microbiome from stocking to harvest from four sites in Scotland 2018-2020. At each site, mucosal gill swabs were collected fortnightly (sites A &amp; C) or monthly (sites B &amp; G) from eight fish in two pens (n=623 fish). Gill samples underwent 16S rRNA Illumina MiSeq amplicon library preparation and analysis to characterise changes in the gill mucosal communities. Complex Gill disease was identified in sampled fish from each site (A: 20%, B: 11%, C: 24%, G: 13%).At the four sites we showed species richness (alpha diversity) varied over time ranging from 68 ±SD31 to 777 ±SD152 (average 353 ±SD 158). Interestingly, 1100–1500 degree-days after seawater transfer, a distinct decline in species richness and evenness was observed at three of the four sties (A:410 SD± 134 to 276 SD±86 , B:264 SD±67 to 156 SD±71 , C:356 SD±130 to 228 SD±89). In terms of community composition, 1) while there were similarities between all four sites, the communities were statistically different (R = 0.067, P&lt;0.001) from each farm, indicating that sites contributes to differences seen in the microbiome. Within each farm, a seasonal pattern in the microbiome was seen, with community shifts through winter-spring-summer-autumn (A: R2 = 0.11, P&lt;0.001, B: R2 = 0.30, P&lt;0.001, C: R2 = 0.22, P&lt;0.001, G: R2 = 0.11, P&lt;0.001). Proteobacteria dominated the gills (average: 73.6%), with Bacteriodota (average: 18.2%) also highly abundant at all sites. Overall, we have shown changes in the bacterial communities over time and between sites indicating both seasonal and temporal changes in the gill microbiome. Understanding this will help us to better understand the role of the gill microbiome and its role in fish health. <br/