Search

Dans cet article, on montre la possibilité de concevoir un diffuseur résonnant planaire présentant une polarisation croisée en amplitude indépendante de son orientation. Le diffuseur résonnant est composé de deux dipôles avec une disposition angulaire spécifique de manière à respecter les contraintes théoriques introduites pour obtenir une telle invariance. Un diffuseur fonctionnant à 4,26 GHz a été fabriqué et mesuré, offrant de bonnes performances avec une variation relative de la composante de polarisation croisée inférieure à-2 dB quel que soit l'angle d'orientation.

Lead (Pb) is a global environmental pollutant, responsible for millions of deaths each year. Elevated lead levels in Australian mining towns, such as Broken Hill and Mount Isa, are severe hazards to human and wildlife health. Living organisms, including animals, have the ability to evolve to resist the negative effects imposed by the environmental stressors like lead. Sparrows are well known for their invasions and adaptations to new environments, including polluted environments. One such example includes the establishment of sparrow populations in lead polluted towns of Broken Hill and Mount Isa in Australia. We hypothesized that lead toxicity induces stress adaptive response in sparrows by regulating the avian proteome to withstand the high lead levels in these towns. To test this hypothesis, we optimized protocols for shotgun proteomics analysis of avian serum and frozen blood. Optimized protocols were then used for shotgun proteomics analysis of serum, frozen whole blood, and blood pellets of sparrows from Broken Hill. By comparing the blood proteome of sparrows with high and low blood lead levels, we identified 13 differentially expressed proteins. At least six proteins, including ferritin, DNA lyase and ribosomal proteins, can be linked to traits related to lead and other heavy metal adaptation.

The volume available on small satellites restricts the size of optical apertures to a few centimetres, limiting the Ground-Sampling Distance (GSD) in the visible to typically 3 m at 500 km. We present in this paper the latest development of a laboratory demonstrator of a segmented deployable telescope that will triple the achievable ground resolution and improve photometric capability of CubeSat imagers. Each mirror segment is folded for launch and unfolds in space. We demonstrate through laboratory validation very high deployment repeatability of the mirrors, Comment: Proceedings of 13th IAA Symposium on Small Satellites for Earth Observation (SSSEO 2021)

Heavy metal accumulation in arable lands and water bodies has become one of the serious global issues among multitude of food security challenges. In particular, cadmium (Cd) concentration has been increasing substantially in the environment that negatively affects the growth and yield of important agricultural crops, especially wheat (Triticum aestivum L.). No doubt, nanotechnology is a revolutionary science but the comprehension of nanoparticle-plants interaction and its potential alleviatory role against metal stress is still elusive. Here, we investigated the mechanistic role of astaxanthin nanoparticles (AstNPs) in Cd stress amelioration and their interaction with wheat under Cd-spiked conditions. The AstNPs fabrication was confirmed through ultraviolet visible spectroscopy, where the particles showed characteristic peak at 423 nm. However, Fourier transform infrared, X-ray diffraction, scanning electron microscopy and transmission electron microscopy analyses confirmed the presence of stabilized spherical-shaped nanocrystals of AstNPs within the size range of 12.03–30.37 nm. The hydroponic application of AstNPs (100 mg L−1) to Cd-affected wheat plants increased shoot height (59%), shoot dry weight (31%), nitrogen concentration (42%), and phosphorus concentration (26%) as compared to non-treated Cd affected seedlings. Moreover, AstNPs-treated plants showed reduction in acropetal Cd translocation (29%) in contrast to plants treated with Cd only. Under Cd-spiked conditions, AstNPs-treated plants displayed an improved nutrient profile (P, N, K+ and Ca2+) with a relative decrease in Na+ content in comparison with non-treated plants. Interestingly, it was found that AstNPs restricted the translocation of Cd to aerial plant parts by negatively regulating Cd transporter genes (TaHMA2 and TaHMA3), and relieved plants from oxidative burst by activating antioxidant machinery via triggering expressions of TaSOD and TaPOD genes. Consequently, it was observed that the application of AstNPs helped in maintaining the nutrient acquisition and ionic homeostasis in Cd-affected wheat plants, which subsequently improved the physiochemical profiles of plants under Cd-stress. This study suggests that AstNPs plausibly serve as stress stabilizers for plants under heavy metal-polluted environment.

Objective: Thisstudy was planned to evaluate the extracts of Aloe vera (AV) at three differentpH as a growth promoter, immunostimulant and coccidiostat agent in broiler production. Materials and Methods: Thisexperiment was undertaken for a period of 35 days in the Institute of AnimalSciences, Faculty of Animal Husbandry, University of Agriculture Faisalabad,Pakistan. A total of 150 day-old broilerbirds (Cobb) were randomly assigned to 5 treatments with 3 replicates of 10chicks each. Birds were offered commercial broiler starter and finisher diets supplementedwith 100 mg/kg enramycin (ANT), 50 ml/liter AV of pH3 (AV1), 50 ml/liter AV of pH 7 (AV2), 50ml/liter AV of pH 12 (AV3) and only freshclean water (CON).Results: Theresults revealed that ANT and AV1 treatments caused a significantly (P

Made available in DSpace on 2021-07-14T10:29:01Z (GMT). No. of bitstreams: 0 Previous issue date: 2016-12-01. Added 1 bitstream(s) on 2021-07-14T11:31:23Z : No. of bitstreams: 1 S1516-89132016000100432.pdf: 378935 bytes, checksum: ff320afc7f504575188031cceccd3b20 (MD5) The presence of geneticdiversity is of great importance in improving wheat traits and developing strategies for optimal conservation of germplasm. Genetic diversity was assessed among common wheat cultivars using RAPD (Random Amplified Polymorphic DNA) markers at the Center of Agriculture, Biochemistry and Biotechnology (CABB), University of Agriculture, Faisalabad. RAPD primers were used among 14 Pakistani wheat cultivars, to screen the progenies and for the identification of the genes of interest. The polymorphic information content (PIC), was measured as the percentage of polymorphic fragments for all primers. A total of 583 bands(84% polymorphic) in all 14 wheat cultivars was amplified and discriminated all the wheat genotypes. The number of fragments amplified per primer ranged from 35 to 69 with an average of 48.52 fragments per primer averagely was observed. Population structure analysis anddandrogram showed distinct clustering among different wheat genotypes. Millat-11, Punjab-11, PBW-222 generated the maximum level of polymorphism, standing alone in the cluster while others are scatteredin different group.As a result, genetically numerous progenies are known, increasing the quality of sorts collections by broadening the genetic base of wheat cultivars. This study additionally indicates that RAPD markers allow quicker response and provide high throughputprocedure of accessions from a variety assortment to assess genetic diversity among wheat genotypes. University of Agriculture Faisalabad, Centre of Agricultural Biochemistry and Biotechnology King Saud University, department of plant production University of Sao Paulo State, Biotechnology lab King Saud University, Department of plant production PirMehr Ali Shah Arid Agriculture University Rawalpindi, Department of Agronomy