1. For the two motile bacilli, B. coli and B. aertryke, the absorption of a single 155 K.V. electron is sufficient to cause death. Furthermore, all, or nearly all, the electrons absorbed are lethal. The same is undoubtedly true of Staphylococcus aureus. In addition to providing a quantitative picture of the interaction of bacteria and cathode rays, these results suggest that radiation of the energy content used in our experiments is not suitable for altering the inheritable characteristics of bacteria. 2. The differences in sensitivity to cathode rays shown by the bacteria studied can be explained by the purely physical factor of size. 3. Counts giving significant conclusions concerning killing rates can be obtained only if there is no clumping of the cells when spread and only if the cells are not allowed to multiply before irradiation. Both these precautions seem rarely to have been met in the experiments that have in the past been made with X-rays and other forms of radiation.
Download full-text PDF |
Source |
|---|---|
| http://www.ncbi.nlm.nih.gov/pmc/articles/PMC2131847 | PMC |
| http://dx.doi.org/10.1084/jem.51.6.921 | DOI Listing |
Publication Analysis
Top Keywords
Similar Publications
AI-enhanced X-ray spectrum reconstruction for medical imaging system.
Appl Radiat Isot
March 2025
School of Artificial Intelligence, Wenzhou Polytechnic, Wenzhou, 325035, China. Electronic address:
For the purpose of assessing image quality and calculating patient X-ray dosage in radiology, computed tomography (CT), fluoroscopy, mammography, and other fields, it is necessary to have prior knowledge of the X-ray energy spectrum. The main components of an X-ray tube are an electron filament, also known as the cathode, and an anode, which is often made of tungsten or rubidium and angled at a certain angle. At the point where the electrons generated by the cathode and the anode make contact, a spectrum of X-rays with energies spanning from zero to the maximum energy value of the released electrons is created.
View Article and Find Full Text PDFSynergistic effects of a sequential recirculation electrochemical system combined with low-cost UV-LEDs on the gram-negative bacteria inactivation.
Environ Sci Pollut Res Int
January 2025
Grupo de Investigación en Ciencias Biológicas y Químicas, Facultad de Ciencias, Universidad Antonio Nariño, Bogotá D.C, Colombia.
In this work, an electrochemical system combined with low-cost UV-LEDs was implemented for the inactivation of Escherichia coli and Pseudomonas aeruginosa. The individual elimination of these bacteria was followed by plate counting and flow cytometry, as complementary techniques to establish the cell inactivation and non-viability, respectively. The contribution of the different parts of the disinfection system (anode, cathode, and light) was determined.
View Article and Find Full Text PDFSulfur Speciation in Li-S Batteries Determined by Laboratory X-ray Emission Spectroscopy.
ACS Appl Energy Mater
December 2024
Jožef Stefan Institute, Jamova 39, 1000 Ljubljana, Slovenia.
In this work, sulfur X-ray emission measurements on a Li-S battery cathode were performed using a laboratory setup as an alternative to more common synchrotron radiation based absorption studies. Photoexcitation by an X-ray tube was used. Valence-to-core Kβ X-ray emission spectra were recorded with a wavelength dispersive crystal spectrometer in von Hamos geometry, providing excellent energy resolution and good detection efficiency.
View Article and Find Full Text PDFA multiple x-ray-source array (MXA) system with a planar two-dimensional source distribution for digital breast tomosynthesis.
Med Phys
December 2024
Department of Physics, University of New Mexico, Albuquerque, New Mexico, USA.
Background: Digital breast tomosynthesis (DBT) has outpaced digital mammography in clinical adoption in the United States; however, substantial technological limitations remain to image quality in DBT, including undersampling from a one-dimensional (1D) scan geometry, x-ray source motion during acquisition, and patient motion artifacts from long exam times.
Purpose: A thermionic cathode x-ray system employing two-dimensional (2D, planar) multiple x-ray-source arrays (MXA) is proposed to improve DBT image quality.
Methods: A 1D MXA, consisting of a linear array of thermionic cathodes was used to simulate a 2D MXA.
Domestic wastewater treatment towards reuse by "self-supplied" microbial electrochemical system assisted UV/HO process.
Water Res
December 2024
Department of Energy, Environmental and Chemical Engineering, Washington University in St. Louis, St. Louis, MO 63130, USA. Electronic address:
Domestic wastewater is a potential source of water for non-potable reuse that may help address the global water, energy, and resource challenges. Herein, a "self-supplied" process through integrating microbial electrochemical system (MES) with UV/HO was developed and investigated for wastewater treatment. HO was "self-supplied" from MES while the MES catholyte was "self-supplied" from the final effluent of UV/HO.
View Article and Find Full Text PDFWant AI Summaries of new PubMed Abstracts delivered to your In-box?
Enter search terms and have AI summaries delivered each week - change queries or unsubscribe any time!