Microbiota comparison of amur ide (Leuciscus waleckii) intestine and waters at alkaline water and freshwater as the living environment

The intestinal microbiota of marine animals was influenced by the water and environment in which they live. The Amur ide (Leuciscus waleckii) adapts to extremely high alkalinity and is an ideal material for aquacultural studies of alkaline adaptation. In this study, we screened intestinal indicator flora and functional redundancy of intestinal colonies in alkaline-water species (AW) and freshwater species (FW) of Amur ide (L. waleckii) in these different aquatic environments. The available vs. community composition correlations were then predicted by contrasting each other with the flora contained in environmental water samples. Here, five microbial species and six genera were identified owing to the classifiable sequence. The intestinal microbiota that existed in AW and FW had approximately 1/3 of the operational taxonomic units in the respective living water environments, meaning gut microbes in the aqueous habitats will have an influential association with gut microbes in AW and FW. Compared to the bacterial composition of the FW intestine and that present in freshwater, Moraxella osloensis, Psychrobacter maritimus, and Psychrobacter faecalis were significantly enriched in the intestine of AW and alkaline water samples. In the FW intestine and freshwater samples, however, Cryptomonas curvata and Polynucleobacter asymbioticus were highly improved, which can be summarized as Enterobacter sp., the predominant population in the AW gut, while Aeromonas and Ralstonia being primarily present in FW intestines. Photosynthetic bacteria were most significant in both water samples. The results indicated that the intestinal microbiota composition, abundance, and diversity of AW and FW were quite different. In contrast, the microbial composition of the additional alkaline water and freshwater environments showed slight differences. This study expects to enhance our understanding of the alkalinity tolerance of L. waleckii, which will be provided for the breeding of fish living in alkaline water, and push the development of alkaline water resources with increased efficiency.info:eu-repo/semantics/publishedVersio

A Facile Synthesis and Optical Properties of Bundle-Shaped TbPO 4

Bundle-shaped TbPO4·H2O nanorods have been prepared by a facile hydrothermal technique and characterized by XRD, SEM, TEM, UV-Vis diffuse reflectance spectrum (DRS), photoluminescence (PL) spectrum, and lifetime. The results indicate that the obtained sample has hexagonal structure of TbPO4·H2O and is composed of nanorods bundles which is assembled from many single crystalline nanorods with the diameter of around 45 nm and the length of 2.3 μm. The growth of the single crystalline nanorod is along the (001) plane direction. Under the UV light irradiation, TbPO4·H2O nanorods bundles exhibit bright green emission corresponding to the D54→F7J (J=6,5,4,3) transitions of the Tb3+ ions, and the lifetime is determined to be about 0.24 ms

Γ-CT Measurement and CFD Simulation of Cross Section Gas Holdup Distribution in a Gas-Liquid Stirred Standard Rushton Tank

Cross Section Gas Holdup Distributions at 3/4 Dimensionless Static Liquid Height in a Gas-Liquid Stirred Standard Rushton Tank Were Measured using 137Cs Γ-CT Scan Measuring Technology at Larger Gas Flow Rates and Higher Impeller Rotating Speeds. the Obtained CT Scan Images and Digital Distribution Curves of Gas Holdup with Dimensionless Radius based on the CT Images Could Explain the Fluctuation Changes of Gas Holdup Distribution. the Dense Area of Gas Holdup Distribution Appeared in the Upper Space of Impeller Blades. Gas Holdup Increased Both with Gas Flow Rate and Impeller Rotating Speed, But Gas Flow Rate Had More Influence on Gas Holdup Than Impeller Rotating Speed. the Eulerian-Eulerian Two-Fluid Model Coupling with the Bubbles\u27 Coalescence and Break-Up Models, and the Drag Coefficient Model Were Established to Make CFD Simulation of Gas Holdup Distributions for the Gas-Liquid Stirred Rushton Tank under Different Gas Flow Rates and Impeller Rotating Speeds. © 2011 Elsevier Ltd

On the Measurement of Gas Holdup Distribution Near the Region of Impeller in a Gas-Liquid Stirred Rushton Tank by Means of Γ-CT

Three Flow Patterns of Flooding, Loading and Complete Recirculation in a Gas-Liquid Stirred Rushton Tank Were Identified based on Experimental Observation. the Gas-Liquid System Was Composed of Air and Water. under Different Operating Conditions of Gas Flow Rate and Impeller Rotating Speed, the Distribution of Gas Holdup Near the Region of Impeller Was Measured using a Γ-CT Scan Method. Both Quantitative Digital Distribution Curves of Gas Holdup and their Qualitative Color CT Images Were Obtained. at the Region of Impeller, There Was a Convex Characteristic Peak of Gas Holdup Distribution Both in Radial and in Axial Directions, and with the Region Being Gradually Away from the Impeller, the Distribution of Gas Holdup Became Flatter. the Values of Gas Holdup in S33 Regime Were a Little Higher Than Those in L33 Regime. Higher Impeller Rotating Speed Had Some Effect on the Increasing of Gas Holdup at the Region of Higher Axial Height. the Experimental Measurement Results Were Basically Consistent with Those Previously Published by Bombač. the Hole Number and Diameter of Sparger Had Little Influence on the Distribution of Gas Holdup, While the Sparger\u27s Installed Height Had Significant Influence on Them. When the Sparger Was Installed Close to the Bottom of Rushton Tank, a Comparatively Smoother Distribution of Gas Holdup above the Space of Impeller Could Be Obtained. the Research Results in This Paper Were Useful for Better Understanding of Gas Holdup Distribution Near the Region of Impeller of Rushton Tank and Could Also Provide Experimental Data for CFD Simulation. © 2012 Elsevier B.V

Unparticle Physics and A_{FB}^b on the Z pole

An attempt has been made to address the 3\sigma anomaly of the forward-backward asymmetry of b quark in LEP data via an unparticle sector. For most part of the parameter space except certain particular regions, the anomaly could not be explained away plausibly, when constraints from other LEP observables are taken into account.Comment: Version to appear in Phys. Lett. B. 13 pages, 5 figure

Studies of Prototype CsI(Tl) Crystal Scintillators for Low-Energy Neutrino Experiments

Crystal scintillators provide potential merits for the pursuit of low-energy low-background experiments. A CsI(Tl) scintillating crystal detector is being constructed to study low-energy neutrino physics at a nuclear reactor, while projects are underway to adopt this technique for dark matter searches. The choice of the geometrical parameters of the crystal modules, as well as the optimization of the read-out scheme, are the results of an R&D program. Crystals with 40 cm in length were developed. The detector requirements and the achieved performance of the prototypes are presented. Future prospects for this technique are discussed.Comment: 32 pages, 14 figure