A polarimeter for studying the elastic scattering of polarized fast neutrons
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, 15 October 1975, Pages 515-522
A polarimeter for studying the elastic scattering of polarized fast neutrons
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Department of Physics, University of Edinburgh, Scotland
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The polarimeter described has been designed for use over a wide range of neutron energies to obtain the anglar dependence of polarization and the differential cross-section of elastically scattered neutrons. for good efficiency of data collection the asymmetry in the scattering of polarized neutrons is determined simultaneously at 3 scattering angles while adequate monitoring of the neutron flux is provided to enable the differential cross sections to be obtained also. The time-of-flight technique is employed. Examples are provided of the use of the instrument with 3 MeV neutrons from the 2H(d,n)3He reaction and an associated particle time-of-flight system and with 16 MeV neutrons from the 3H(d,n)4He reaction and a pulsed beam time-of-flight system.
Remember meElectron beam time-of-flight plasma potential diagnostic: B T Archer et al, Rev Sci Instrum, 59, –131
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, 1989, Pages 522
Electron beam time-of-flight plasma potential diagnostic: B T Archer et al, Rev Sci Instrum, 59, –131
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, 10 May 2011, Pages 515–522
Induction and scale-up of Billbergia zebrina nodule cluster cultures: Implications for mass propagation, improvement and conservation, , , , , , , a Programa de P&s-gradua&&o em Recursos Gen&ticos Vegetais, Universidade Federal de Santa Catarina, CEP , Florian&polis, SC, Brazilb Universidade Federal do Pampa/Campus S&o Gabriel, S&o Gabriel, RS, BrazilThe Tropical Atlantic Rain Forest is a biome of high diversity and endemism of plant genetic resources. High diversity of bromeliad species occurs in this biome, but part of them is now endangered. Tissue culture based techniques comprise valuable tools for the mass propagation and conservation of endangered bromeliads. In the present work the in vitro regenerative system based on the induction and development of NC from nodal segments of Billbergia zebrina showed different morphogenetic features from those observed in organogenesis and somatic embryogenesis. Different levels of TDZ, NAA, and 2i-P promoted the induction of NC with different morphologies and regenerative potential. NC induced in response to 0.01 μM of TDZ and subcultured on BM free of PGR resulted in high regenerative frequency. NC originated from BM supplemented with TDZ (0.1 μM) when subcultured on BM with NAA (2 μM) and 2-iP (4 μM) resulted in higher mean number of shoots. Elongated shoots were successfully acclimatized in ex vitro conditions and derived plantlets had normal phenotype. Histological analyses revealed the morphogenesis of the NC related to organization of the meristematic zone in the subepidermic region composed by organized layers with small and isodyametric cells followed by the induction of shoot buds. SEM analysis showed that the induction of NC occurred from the basal region of the explants.Highlights? In vitro morphogenesis of bromeliads from the Atlantic Forest, Brazil. ? The in vitro regenerative system based on the induction of NC of Billbergia zebrina. ? High regenerative frequency resulted in higher mean number of shoots. ? Hystological analysis of the NC showed that the induction occurred from the nodal segment.AbbreviationsBAP, 6-benzylaminopurine; BM, basal medium; 2-iP, N6 (2-isopentyl) adenine; GA3, gibberellic acid; NAA, α-naphthaleneacetic acid; NC, nodular cultures; PGR, plant growth regulators; SEM, Scanning electron microscopy; TDZ, thidiazuronKeywordsBromeliads; Microshoots; Regeneration; Histology; Micropropagation
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