UV-C as an efficient means to combat biofilm formation in show caves: evidence from the La Glacière Cave (France) and laboratory experiments

2017 ◽  
Vol 24 (31) ◽  
pp. 24611-24623 ◽  
Author(s):  
Stéphane Pfendler ◽  
Olympe Einhorn ◽  
Battle Karimi ◽  
Faisl Bousta ◽  
Didier Cailhol ◽  
...  
Keyword(s):  
Biofilm Formation ◽  
Laboratory Experiments ◽  
Show Caves ◽  
Uv C

UV-C as an Efficient Means to Combat Biofilm Formation in Cultural Heritage Monument. Biodiversity and Impact on Prehistoric Pigments?

2018 ◽  
pp. 525-530
Author(s):  
Stéphane Pfendler ◽  
Faisl Bousta ◽  
Laurence Alaoui-Sossé ◽  
Abderrahim Khatyr ◽  
Lotfi Aleya ◽  
...  
Keyword(s):  
Cultural Heritage ◽  
Biofilm Formation ◽  
Uv C

UV-C as a means to combat biofilm proliferation on prehistoric paintings: evidence from laboratory experiments

2017 ◽  
Vol 24 (27) ◽  
pp. 21601-21609 ◽  
Author(s):  
Stéphane Pfendler ◽  
Olympe Einhorn ◽  
Faisl Bousta ◽  
Abderrahim Khatyr ◽  
Laurence Alaoui-Sossé ◽  
...  
Keyword(s):  
Laboratory Experiments ◽  
Uv C

scholarly journals Foliar-Applied Small Molecule that Suppresses Biofilm Formation and Enhances Control of Copper-Resistant Xanthomonas euvesicatoria on Pepper

Plant Disease ◽  
2012 ◽  
Vol 96 (11) ◽  
pp. 1638-1644 ◽  
Author(s):  
R. J. Worthington ◽  
S. A. Rogers ◽  
R. W. Huigens ◽  
C. Melander ◽  
D. F. Ritchie
Keyword(s):  
Small Molecules ◽  
Small Molecule ◽  
Biofilm Formation ◽  
Laboratory Experiments ◽  
Field Experiments ◽  
Copper Hydroxide ◽  
In Vitro System ◽  
Resistant Strains ◽  
Xanthomonas Euvesicatoria

We report a small molecule additive, a member of the 2-aminoimidazole (2AI) group that is an analogue of the marine sponge natural product oroidin that suppresses resistance of Xanthomonas euvesicatoria to copper and decreases biofilm formation in an in vitro system. In laboratory experiments, 2AI combined with copper reduced both bacterial multiplication in broth and bacterial recovery on pepper leaf discs of a copper-resistant strain of X. euvesicatoria to a level close to that of a copper-sensitive strain. Compound 2AI used alone exhibited minimal bactericidal activity. In 3 years of field experiments, when combined with a copper-containing material, copper hydroxide (Kocide 3000), and other antibacterial materials, these spray mixtures resulted in decreased bacterial spot foliar disease and increased fruit yields using hybrid bell pepper (Capsicum annuum) cultivars and copper-resistant strains of X. euvesicatoria. This study demonstrates the concept for using small molecules as additives to antibacterial compounds at nonbactericidal concentrations under field conditions that, in the laboratory, were demonstrated to suppress bacterial biofilms and copper-resistant strains.

scholarly journals Effect of Microwave and UV-C Radiation on Some Germination Parameters of Barley Seed Using Mathematical Models of Gompertz and Logistic

2020 ◽  
Vol 33 (2) ◽  
pp. 28-41
Author(s):  
Samir K. Lazim ◽  
Marwan N. Ramadhan
Keyword(s):  
Seed Germination ◽  
Exposure Time ◽  
Growth Curve ◽  
Laboratory Experiments ◽  
Germination Percentage ◽  
Barley Seed ◽  
Separated Sets ◽  
Uv C ◽  
Fitting Model ◽  
Germination Parameters

Two separated sets of laboratory experiments were studied for barley seeds treating using a microwave and ultraviolet irradiation. In the microwave set, seeds have been exposed to the microwave radiations (2450 MHz) for 0 sec (control, MW0), 5 sec (MW1), 10 sec (MW2), and 20 sec (MW3), while in the ultraviolet set, seeds have exposed to UV-C radiation (254 nm) for 0 min (control, UV0), 30 min (UV1), 60 min (UV2), and 120 min (UV3). The aim is to study the influences of different exposure time from MW and UV-C radiation on some barley seed germination parameters and to choose the fitting model Logistic (Log) or Gompertz (Gom) suited to cumulative germination curves under the influence of these factors.  The results of this study showed higher seed germination percentage (93.33%) at the exposure time MW2 and UV3 (88.33%), whereas the lowest value (66.67%) recorded in MW3 treatment. The results also appeared the best values at MW2 in SG, 6.24 seed day-1; in GRI, 31.19% day-1, and in GI, 87.67, as well as at UV2 in MGT, 3.32 day. The higher value of asymptotic germination barley seeds was found with Gom function (97.24%, and 88.71%) at MW2 and UV3, respectively. Besides, Gom functions at MW1 and UV2 give the highest maximum germination rates at 2,08 and 2.51% h-1, respectively. The results of the Log equation illustrated the highest value of germination percentage of the inflection point has recorded in 43.85 and 47.37 % on UV3 and MW2 treatments, respectively. For the fitting growth curve, the results have proven that the Gom function was shown the lowest values in MSE in all MW and UV exposure times, as compared with the Log function. So, the results of the Gom function were more fit for the growth curve for MW and UV treatments, as compared with the Log function.

Factors driving epilithic algal colonization in show caves and new insights into combating biofilm development with UV-C treatments

2014 ◽  
Vol 484 ◽  
pp. 43-52 ◽  
Author(s):  
Fabien Borderie ◽  
Nicolas Tête ◽  
Didier Cailhol ◽  
Laurence Alaoui-Sehmer ◽  
Faisl Bousta ◽  
...  
Keyword(s):  
Show Caves ◽  
Biofilm Development ◽  
Uv C

Covering of cometary nucleus by refractory crust and its evolution into asteroid-like body

1999 ◽  
Vol 173 ◽  
pp. 365-370
Author(s):  
Kh.I. Ibadinov
Keyword(s):  
Laboratory Experiments ◽  
Cometary Nucleus ◽  
Sublimation Rate ◽  
Cometary Nuclei ◽  
Short Period Comet ◽  
Short Period ◽  
Brightness Decrease ◽  
Crust Thickness ◽  
Ice Sublimation ◽  
Period Comet

AbstractFrom the established dependence of the brightness decrease of a short-period comet dependence on the perihelion distance of its orbit it follows that part of the surface of these cometary nuclei gradually covers by a refractory crust. The results of cometary nucleus simulation show that at constant insolation energy the crust thickness is proportional to the square root of the insolation time and the ice sublimation rate is inversely proportional to the crust thickness. From laboratory experiments resulted the thermal regime, the gas productivity of the nucleus, covering of the nucleus by the crust, and the tempo of evolution of a short-period comet into the asteroid-like body studied.

Bacterial biofilm behavior in water-supply lines of dental units

1992 ◽  
Vol 50 (1) ◽  
pp. 882-883
Author(s):  
B.D. Tall ◽  
K.S. George ◽  
R. T. Gray ◽  
H.N. Williams
Keyword(s):  
Water Supply ◽  
Medical Devices ◽  
Biofilm Formation ◽  
Bacterial Biofilm

Studies of bacterial behavior in many environments have shown that most organisms attach to surfaces, forming communities of microcolonies called biofilms. In contaminated medical devices, biofilms may serve both as reservoirs and as inocula for the initiation of infections. Recently, there has been much concern about the potential of dental units to transmit infections. Because the mechanisms of biofilm formation are ill-defined, we investigated the behavior and formation of a biofilm associated with tubing leading to the water syringe of a dental unit over a period of 1 month.

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