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- Maldanis, L., et al.
(författare)
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Heart fossilization is possible and informs the evolution of cardiac outflow tract in vertebrates
- 2016
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Ingår i: eLIFE. - : eLife Sciences Publications Ltd. - 2050-084X. ; 5:APRIL2016
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Tidskriftsartikel (refereegranskat)abstract
- Elucidating cardiac evolution has been frustrated by lack of fossils. One celebrated enigma in cardiac evolution involves the transition from a cardiac outflow tract dominated by a Multi-Valved conus arteriosus in basal actinopterygians, to an outflow tract commanded by the Non- Valved, elastic, bulbus arteriosus in higher actinopterygians. We demonstrate that cardiac preservation is possible in the extinct fish Rhacolepis buccalis from the Brazilian Cretaceous. Using X-Ray synchrotron microtomography, we show that Rhacolepis fossils display hearts with a conus arteriosus containing at least five valve rows. This represents a transitional morphology between the primitive, multivalvar, conal condition and the derived, monovalvar, bulbar state of the outflow tract in modern actinopterygians. Our data rescue a Long-Lost cardiac phenotype (119-113 Ma) and suggest that outflow tract simplification in actinopterygians is compatible with a gradual, rather than a drastic saltation event. Overall, our results demonstrate the feasibility of studying cardiac evolution in fossils.
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| 4. |
- Etcheverry, Sebastián, et al.
(författare)
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Microsecond switching of plasmonic nanorods in an all-fiber optofluidic component
- 2017
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Ingår i: Optica. - : Optical Society of America. - 2334-2536. ; 4:8, s. 864-870
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Tidskriftsartikel (refereegranskat)abstract
- As information technologies move from electron-to photon-based systems, the need to rapidly modulate light is of paramount importance. Here, we study the evolution of the electric-field-induced alignment of gold nanorods suspended in organic solvents. The experiments were performed using an all-fiber optofluidic device, which enables convenient interaction of light, electric fields, and the nanorod suspension. We demonstrate microsecond nanorod switching times, three orders of magnitude faster than a traditional Freederickcz-based liquid crystal alignment mechanism. We find that the dynamics of the alignment agrees well with the Einstein-Smoluchowski relationship, allowing for the determination of the rotational diffusion coefficient and polarizability anisotropy of the nanorods as well as the effective length of the ligands capping the nanorods. The ability to dynamically control the optical properties of these plasmonic suspensions coupled with the point-to-point delivery of light from the fiber component, as demonstrated in this work, may enable novel ultrafast optical switches, filters, displays, and spatial light modulators.
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| 6. |
- Medvedevskikh, Maria, et al.
(författare)
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Report of the CCQM-K130 : Nitrogen mass fraction measurements in glycine
- 2017
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Ingår i: Metrologia. - 0026-1394 .- 1681-7575. ; 54:1A
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Tidskriftsartikel (refereegranskat)abstract
- Mass fraction of nitrogen is very important pointer because the results of these measurements are often used for determination of protein mass fraction that is an important indicator of the quality of the vast majority of food products and raw materials, in particular dry milk powder. Proteins-enzymes catalyze chemical reactions, protein along with fats and carbohydrates is one of the indicators characterizing the energy value of food, so its definition is mandatory for all food products. The aim of this key comparison CCQM-K130 and pilot study P166 is to support National Measurement Institutes (NMIs) and Designated Institutes (DIs) to demonstrate the validity of the procedures the employed for determination of nitrogen mass fraction in glycine. The study material for this key comparison and pilot study has been selected to be representative as one of the aminoacid-the simplest part of the protein. Glycine is an amino acid, single acid that does not have any isomers (melting point-290 °C; specific heat of evaporation-528,6 J/kg; specific melting heat-981,1 J/kg; pKa-2,34, molar mass-75,07 g/mol, density-1,607 g/cm3). Ural Scientific Research Institute for Metrology (UNIIM) acted as the coordinating laboratory of this comparison and pilot study. Eight NMIs participated in this key comparison and two NMIs participated in Pilot study. The results of Pilot study are excluded from the Report B.
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