SwePub
Sök i SwePub databas

  Utökad sökning

Träfflista för sökning "WFRF:(Ray S.P.S.) "

Sökning: WFRF:(Ray S.P.S.)

  • Resultat 1-3 av 3
Sortera/gruppera träfflistan
   
NumreringReferensOmslagsbildHitta
1.
  • Lynch, David K., et al. (författare)
  • NOVA V2362 CYGNI (NOVA CYGNI 2006): SPITZER, SWIFT, AND GROUND-BASED SPECTRAL EVOLUTION
  • 2008
  • Ingår i: Astronomical Journal. - 1538-3881 .- 0004-6256. ; 136:number 5, 2008 November, s. 1815-1827
  • Tidskriftsartikel (refereegranskat)abstract
    • Nova V2362 Cygni has undergone a number of very unusual changes. Ground-based spectroscopy initially revealed a normal sequence of events: the object faded and its near-infrared emission lines gradually shifted to higher excitation conditions until about day 100 when the optical fading reversed and the object slowly brightened. This was accompanied by a rise in the Swift X-ray telescope flux and a sudden shift in excitation of the visible and IR spectrum back to low levels. The new lower excitation spectrum revealed broad line widths and many P-Cygni profiles, all indicative of the ejection of a second shell. Eventually, dust formed, the X-ray brightness—apparently unaffected by dust formation—peaked and then declined, and the object faded at all wavelengths. The Spitzer dust spectra revealed a number of solid-state emission features that, at this time, are not identified.
  •  
2.
  •  
3.
  • Routh, J, et al. (författare)
  • Arsenic reduction by indigenous bacteria in shallow aquifers from Ambikanagar, West Bengal, India
  • 2005
  • Ingår i: ADVANCES IN ARSENIC RESEARCH. - WASHINGTON, DC : AMER CHEMICAL SOC. - 0841239134 ; , s. 132-147
  • Konferensbidrag (refereegranskat)abstract
    • Possible biological mechanisms contributing towards the transformation of arsenic (As) in aquifer sediments was investigated in Ambikanagar. Enrichment cultures indicated several As tolerant species, which actively reduced As(V) under sub-oxic conditions. High As concentrations in the microcosms increased toxicity, and hence, bacterial types and the heterotrophic plate counts declined. Bacteria isolated from enrichment cultures were Acinetobacter johnsonii, Citrobacter freundii, Comamonas testosteroni, Enterobacter cloacae, and Sphingobium yanoikuyae. On inoculating the medium with these bacteria, different growth and As(V) reduction rates occurred. A zero-order model fits the As(V) reduction data. Initial As concentration seems to affect growth and As(V) reduction rates, and these values were highest in A. johnsonii. In contrast, C testosteroni and S. yanoikuyae were almost unaffected by the initial As(V) concentrations. As(V) reduction in these bacteria occurs for detoxification or respiratory purposes (e.g., A. johnsonii). These experiments confirm that microorganisms may result in remobilization of As from sediments, and impact groundwater treatment.
  •  
Skapa referenser, mejla, bekava och länka
  • Resultat 1-3 av 3

Kungliga biblioteket hanterar dina personuppgifter i enlighet med EU:s dataskyddsförordning (2018), GDPR. Läs mer om hur det funkar här.
Så här hanterar KB dina uppgifter vid användning av denna tjänst.

 
pil uppåt Stäng

Kopiera och spara länken för att återkomma till aktuell vy