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Probing the Redox Reactivity of Alkyl Bound Astatine: A Study on the Formation and Cleavage of a Stable At-C Bond.
Inorg Chem
January 2025
Department of Chemistry, University of Alabama at Birmingham, Birmingham, Alabama 35294, United States.
The formation of a stable alkyl At-C bond occurs during the shipment of At on a 3-octanone-impregnated column and the reactivity of At stripped from columns has been studied. The At could not be recovered from the 3-octanone organic phase using nitric acid or sodium hydroxide, even up to 10 and 15.7 M, respectively.
View Article and Find Full Text PDFHow colonizing alfalfa sprouts modulates the virulence of Shiga toxin-producing Escherichia coli.
Int J Food Microbiol
January 2025
Department of Food Science and Technology, The Ohio State University, Columbus, OH, USA; Department of Microbiology, The Ohio State University, Columbus, OH, USA. Electronic address:
Shiga toxin-producing Escherichia coli (STEC), a significant cause of foodborne illnesses, is often associated with the consumption of fresh produce, including alfalfa sprouts. This study was executed to determine how quickly STEC grows, adapts, and colonizes alfalfa sprouts during production and storage, and whether the pathogen's virulence and infectious doses are affected by physiological adaptation to sprouts as an environment. A reporter STEC O157:H7 EDL933 strain was developed to track the transcription of eae, a virulence gene involved in colonizing human intestinal enterocytes.
View Article and Find Full Text PDFApplication of Calcium Hypochlorite for Sanitizing 3/16-Inch Tubing Used in Maple Sap Collection.
Microorganisms
September 2024
Department of Biology, West Virginia State University, Institute, WV 25112, USA.
Article Synopsis
- Despite the common use of calcium hypochlorite (Ca(ClO)) for sanitizing maple sap tubing, there's a lack of scientific data on its effectiveness and best practices.
- Researchers conducted an experiment to assess the microbial impact of various concentrations and contact times of Ca(ClO) on tubing contaminated with microorganisms.
- Results indicated that higher concentrations (at least 400 ppm) and longer exposure times are necessary for effective microbial inactivation, providing useful guidelines for maple syrup producers.
In vitro spectroscopic analysis of the chemical interaction between calcium hypochlorite and chlorhexidine.
Odontology
October 2024
Post-Graduate Program in Oral Science, Faculty of Dentistry, Federal University of Santa Maria (UFSM), Roraima Avenue #1000, T Street, Building 26F, Room 2383, Santa Maria, Rio Grande do Sul, 97.105-900, Brazil.
This study aimed to identify the chemical composition resulting from the chemical interaction between calcium hypochlorite [Ca(OCl)] and chlorhexidine (CHX) using different H and C nuclear magnetic resonance spectrometry (NMR), correlated two-dimensional spectroscopy (2D COSY), heteronuclear single quantum coherence (HSQC), and Fourier Transform Infrared Spectroscopy (FTIR) experiments. The 5.25% Ca(OCl) was mixed with 2% CHX in a 1:1 ratio, obtaining an orange-brown precipitate that was filtered, washed in ultrapure water, dried and characterized by H and C NMR, 2D COSY, HSQC and FTIR.
View Article and Find Full Text PDFBonding and Cleaning Effects of Irrigation Protocols Using Calcium Hypochlorite on the Post-space Radicular Dentin.
Oper Dent
November 2024
Milton Carlos Kuga, DDS, MSc, PhD, Department of Restorative Dentistry, School of Dentistry, São Paulo State University, Araraquara, SP, Brazil.
This study evaluated the effect of 2.5% sodium hypochlorite (SH) or calcium hypochlorite (CH) submitted to passive ultrasonic irrigation (PUI) or conventional irrigation (CI) on the incidence of residues and the bond strength of the cementation system to post-space dentin. Distilled water (DW) and 2.
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