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Wyszukujesz frazę "counting efficiency" wg kryterium: Temat


Wyświetlanie 1-2 z 2
Tytuł:
Effect of liquid scintillating cocktail volume on 3H and 14C measurement parameters using a Quantulus spectrometer
Autorzy:
Komosa, A.
Ślepecka, K.
Powiązania:
https://bibliotekanauki.pl/articles/148489.pdf
Data publikacji:
2010
Wydawca:
Instytut Chemii i Techniki Jądrowej
Tematy:
liquid scintillating cocktail
tritium
14C
Quantulus
counting efficiency
standard quench parameter (SQP)
figure of merit (FOM)
Opis:
Results of study on the influence of cocktail volume on such measuring parameters as counting efficiency, standard quench parameter (SQP) and figure of merit (FOM) are described. Nine commercial cocktails were tested using a Quantulus spectrometer. Two kinds of vials (low-diffusion teflon-coated polyethylene (LD-PE) and high-performance glass (HP-G)) and two standard solutions (14C and 3H) were used. Measurements were performed at seven quench levels ensured by carbon tetrachloride addition to the scintillation vials. Various quench sensitivity of the studied cocktails was found. Cocktails based on simple benzene-derived solvents revealed the best quench resistance. In general, increasing cocktail volume caused an increase in the counting efficiency. However, the background increased as well, what resulted in FOM diminishing. Studied cocktails revealed also various responses to volume changes.
Źródło:
Nukleonika; 2010, 55, 2; 155-161
0029-5922
1508-5791
Pojawia się w:
Nukleonika
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Detection of airborne microbes in a composting facility by cultivation based and cultivation-independent methods
Autorzy:
Albrecht, A
Witzenberger, R.
Bernzen, U.
Jackel, U.
Powiązania:
https://bibliotekanauki.pl/articles/50677.pdf
Data publikacji:
2007
Wydawca:
Instytut Medycyny Wsi
Tematy:
composting process
airborne microbe
humification
cultivation-independent method
degradation
organic material
bacteria
fungi
counting efficiency
waste management
detection
compost
Opis:
Standard methods for quantifi cation of airborne bacteria are based on cultivation and counting of grown colonies. From complex natural environments it is known that only a small fraction of the total number of cells can be cultivated on routinely used agar-media. Direct microscopic cell counting after DNA-staining usually generates higher concentrations of one to two magnitudes. The objective of the presented study was to compare the concentrations of airborne bacteria sampled in a composting facility by using for any sample the cultivation on trytic soy agar (TSA) – agar, as well as direct counting after DAPI-staining. The concentrations after counting grown colonies were within a range of 105-107 cfu m-3. Concentrations of direct counted cells ranged between 106-109 microbes m-3. In these comparative measurements only 1.5-15.3% of the airborne bacterial cells enumerated by direct counting formed countable colonies after incubation on TSA-agar. Obviously, cultivation based methods underestimate the real amount of airborne microbes. In addition, from literature it is known that inactive or even dead cells can also have the potential to cause health effects. Consequently, a risk assessment based only on measuring colony forming units may, in some cases, not be sufficient.
Źródło:
Annals of Agricultural and Environmental Medicine; 2007, 14, 1
1232-1966
Pojawia się w:
Annals of Agricultural and Environmental Medicine
Dostawca treści:
Biblioteka Nauki
Artykuł
    Wyświetlanie 1-2 z 2

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