Relevant factors affecting microbial surface decontamination by pulsed light.
Summary of "Relevant factors affecting microbial surface decontamination by pulsed light."
Pulsed Light (PL) uses intense flashes of white light rich in ultraviolet (UV) light for decontamination. A log-reduction higher than 5 was obtained in one flash and at fluences lower than 1.8J/cm(2) on spores of a range of spore-forming bacteria, of vegetative cells of non-spore-forming bacteria and on yeasts spread on agar media. Vegetative cells were more sensitive than spores. The inactivation by PL of Bacillus subtilis, B. atrophaeus, B. cereus, Geobacillus stearothermophilus, and Aspergillus niger spores sprayed on polystyrene was similar. The inactivation by PL of B. subtilis and A. niger spores sprayed on glass was slightly lower than on polystyrene. No alteration of the spore structures was detected by scanning electron microscopy for both PL treated B. subtilis and A. niger spores. The inactivation of spores of B. subtilis, B. atrophaeus, B. cereus and B. pumilus by PL or by continuous UV-C at identical fluences was not different, and was much higher by PL for A. niger spores. The increase in the input voltage of the lamps (which also increases the UV-C %) resulted in a higher inactivation. There was no correlation between the resistance to heat and the resistance to PL. The relative effect of UV-C radiations and light thermal energy on PL inactivation was discussed.
CLARANOR S.A, Chemin de la Rollande, Agroparc, BP 21 531, F-84916 Avignon cedex 9, France; INRA, UMR408 Sécurité et qualité des produits d'origine végétale, F-84000 Avignon, France; Université d'Avignon et des pays de Vaucluse, UMR 408 Sécurité et
This article was published in the following journal.
Name: International journal of food microbiology
- PubMed Source: http://www.ncbi.nlm.nih.gov/pubmed/21924512
- DOI: http://dx.doi.org/10.1016/j.ijfoodmicro.2011.08.022
Abstract Pulsed electric field (PEF) processing is an effective food preservation technique for the pasteurization of pumpable food products since it inactivates vegetative microbial cells at ambient...
Thousands of bacterial phylotypes colonise the human body and the host response to this bacterial challenge greatly influences our state of health or disease. The concept of infectogenomics highlights...
Pulsed dye laser has been used successfully in the treatment of nail psoriasis. Intense pulsed light (IPL) has been used in the treatment of plaque psoriasis using a 550-nm filter.
It is widely acknowledged that the hospital environment is an important reservoir for many of the pathogenic microbes associated with health care-associated infections (HAIs). Environmental cleaning p...
The plasma emission pre-peaks of many atomic and ionic spectral lines of Cu and Ar were systematically investigated in a Grimm-type pulsed glow discharge (PGD). To register the pre-peaks with sufficie...
The purpose of the trial is to compare efficacy and adverse effects of pulsed dye laser and intense pulsed light in patients with port wine stains.
The purpose of the trial is to compare clinical efficacy and occurrence of side effects in the treatment of photodamaged skin with Pulsed Dye Laser and Intense Pulsed Light.
The purpose of the study is to compare efficacy and adverse effects of pulsed dye laser and intense pulsed light in patients with skin telangiectasia and redness.
This research study was designed to determine the effect on port wine stains (PWS) of liposomal benzoporphyrin derivative monoacid (BPD-MA) termed verteporfin (distributed for medical indi...
The study goal is to conduct a randomized controlled trial to compare safety and accuracy of dosing based on clinical information including the clinical reason for your taking coumadin, yo...
Medical and Biotech [MESH] Definitions
Light absorbing proteins and protein prosthetic groups found in certain microorganisms. Some microbial photoreceptors initiate specific chemical reactions which signal a change in the environment, while others generate energy by pumping specific ions across a cellular membrane.
The sequential activation of serum COMPLEMENT PROTEINS to create the COMPLEMENT MEMBRANE ATTACK COMPLEX. Factors initiating complement activation include ANTIGEN-ANTIBODY COMPLEXES, microbial ANTIGENS, or cell surface POLYSACCHARIDES.
Abnormal responses to sunlight or artificial light due to extreme reactivity of light-absorbing molecules in tissues. It refers almost exclusively to skin photosensitivity, including sunburn, reactions due to repeated prolonged exposure in the absence of photosensitizing factors, and reactions requiring photosensitizing factors such as photosensitizing agents and certain diseases. With restricted reference to skin tissue, it does not include photosensitivity of the eye to light, as in photophobia or photosensitive epilepsy.
Chemical substances that attract or repel cells. The concept denotes especially those factors released as a result of tissue injury, microbial invasion, or immunologic activity, that attract LEUKOCYTES; MACROPHAGES; or other cells to the site of infection or insult.
A multifactorial disease of CATTLE resulting from complex interactions between environmental factors, host factors, and pathogens. The environmental factors act as stressors adversely affecting the IMMUNE SYSTEM and other host defenses and enhancing transmission of infecting agents.