FURTHER STUDIES ON THE IONIZING RADIATION INACTIVATION OF BACTERIAL SPORES

1959 ◽  
Vol 77 (1) ◽  
pp. 38-42 ◽  
Author(s):  
Carl Woese
Keyword(s):  
Ionizing Radiation ◽  
Bacterial Spores ◽  
Radiation Inactivation

scholarly journals Effects of ionizing radiation on the survival of bacterial spores in artificial martian regolith

Icarus ◽  
2010 ◽  
Vol 206 (2) ◽  
pp. 783-786 ◽  
Author(s):  
Ralf Moeller ◽  
Manfred Rohde ◽  
Günther Reitz
Keyword(s):  
Ionizing Radiation ◽  
Bacterial Spores ◽  
Martian Regolith

scholarly journals Inactivation of macromolecules by ionizing radiation. Deterministic single-hit or stochastic multievent process?

1986 ◽  
Vol 233 (3) ◽  
pp. 655-659 ◽  
Author(s):  
S Swillens
Keyword(s):  
Statistical Analysis ◽  
Ionizing Radiation ◽  
Binding Affinity ◽  
Stochastic Theory ◽  
Random Variable ◽  
Radiation Sensitivity ◽  
Statistical Test ◽  
Effect Of Temperature ◽  
Radiation Inactivation ◽  
Complete Inactivation

A stochastic theory concerning the radiation inactivation of macromolecules such as enzymes or receptors is elaborated. In contrast with the single-hit theory, which assumes a complete inactivation of the target as the result of one hit, the stochastic theory postulates that the degree of inactivation by one hit is a random variable. This distinguishing feature has been considered in order to give a possible interpretation to the observed effect of temperature on the radiation-sensitivity of enzymes. As a consequence of the progressive inactivation during irradiation, the binding affinity of a ligand for the macromolecule is impaired by irradiation. Although this property might discriminate the stochastic theory from the classical single-hit theory on the basis of a statistical analysis of experimentally obtained data, it is shown that the commonly obtained degree of inaccuracy may render the statistical test non-conclusive.

scholarly journals Effects of Ionizing Radiation on Microbiological Contaminants of Foods

2010 ◽  
Vol 67 (2) ◽  
Author(s):  
Giorgiana Mihaela BELBE ◽  
Maria TOFANA
Keyword(s):  
Ionizing Radiation ◽  
Gamma Rays ◽  
Food Industry ◽  
Control Method ◽  
Electron Beams ◽  
Bacterial Spores ◽  
X Rays ◽  
Gram Negative ◽  
Voltage Electron ◽  
Irradiated Foods

Ionizing radiation can be used in food industry in order to control the number of microbiological contaminants, among others. The sources of irradiation allowed to be used in this respect are: high-voltage electron beams up to 10 MeV, X – rays up to 5 MeV and gamma rays produced from the radioisotopes 60Co and 137Cs. One of the most important properties of irradiation is inactivation of microorganisms, especially pathogens. Gram-negative pathogen bacteria are very sensitive to radiation. As expected bacterial spores are more resistant to ionizing radiation than vegetative cells are. Irradiation also reduces the number of mould populations. Yeasts on the other hand are more radio-resistant than bacteria and moulds and can become the dominant flora of irradiated foods. In what viruses are concerned, ionizing radiation must be accompanied by other treatments in order to be an efficient inactivation method. In conclusion, ionizing radiation can be used, at acceptable doses, as a control method in preserving the innocuity of foods.

Radiation-induced surface decomposition

1983 ◽  
Vol 41 ◽  
pp. 368-369
Author(s):  
M. L. Knotek
Keyword(s):  
Ionizing Radiation ◽  
Atomic Structure ◽  
Chemical Bonding ◽  
Neutral Species ◽  
Radiation Induced ◽  
Physical And Chemical ◽  
Surface Decomposition ◽  
The Relationship ◽  
Electron And Photon ◽  
Surface Bond

Modern surface analysis is based largely upon the use of ionizing radiation to probe the electronic and atomic structure of the surfaces physical and chemical makeup. In many of these studies the ionizing radiation used as the primary probe is found to induce changes in the structure and makeup of the surface, especially when electrons are employed. A number of techniques employ the phenomenon of radiation induced desorption as a means of probing the nature of the surface bond. These include Electron- and Photon-Stimulated Desorption (ESD and PSD) which measure desorbed ionic and neutral species as they leave the surface after the surface has been excited by some incident ionizing particle. There has recently been a great deal of activity in determining the relationship between the nature of chemical bonding and its susceptibility to radiation damage.

Sign in / Sign up

Export Citation Format

Share Document