Effect of low power lasers on prokaryotic and eukaryotic cells under different stress condition: a review of the literature

2021 ◽  
Author(s):  
Adenilson de Souza da Fonseca ◽  
Larissa Alexsandra da Silva Neto Trajano ◽  
Eduardo Tavares Lima Trajano ◽  
Flavia de Paoli ◽  
Andre Luiz Mencalha
Keyword(s):  
Low Power ◽  
Stress Condition ◽  
Eukaryotic Cells ◽  
Review Of The Literature

Research on Useful Life of Low Power LED Illumination Sources

2013 ◽  
Vol 760-762 ◽  
pp. 20-24
Author(s):  
Wei Min Qi ◽  
Jie Xiao
Keyword(s):  
Low Power ◽  
Stress Condition ◽  
Optical Power ◽  
Simulation Studies ◽  
Light Emitting ◽  
Optical Output ◽  
Degradation Pattern ◽  
Operating Current ◽  
Useful Life ◽  
Four Levels

This paper reports experimental and simulation studies on degradation of optical power of low power LEDs due to current stress and temperature variation. The goal of this study was to study the effect of aging and ambient temperature on optical output power of light emitting diodes and to determine the effective lifespan of LED under stress condition. The LED samples were stressed at four levels of operating current 20mA, 30mA, 40mA, and 45mA with stress time up to 1000h. We find that degradation rate increases with increasing operating current. When LEDs are overstressed by driving at higher current the optical power degraded with stress time. A Mathematical model is developed to predict the behavior of LED at different operating current. Simulations are carried out with this model using MATLAB. Using degradation pattern at higher operating current the lifespan of LEDs was predicted at normal operating current.

scholarly journals White phosphorus genotoxicity

2021 ◽  
Vol 31 ◽  
pp. 00018
Author(s):  
Anton Mindubaev ◽  
Edward Babynin ◽  
Salima Minzanova ◽  
Elena Badeeva ◽  
Yaw Akosah
Keyword(s):  
Ames Test ◽  
White Phosphorus ◽  
Eukaryotic Cells ◽  
Review Of The Literature ◽  
Allium Test ◽  
First Report

The genotoxicity of white phosphorus was previously evaluated using the Ames test, which demonstrated the absence of toxicity. However, with all the advantages of this method, the use of the Ames test has some shortfallsin assessing genotoxicity. For this purpose, a series of supplementary tests wereconducted, including the SOS-lux test for DNA damaging activity. In the present work,the SOS-lux test confirmed the genotoxicity of white phosphorus. Based on a review of the literature, our results denote a first report on the genotoxic properties of white phosphorus. Allium test showed the mitotoxic effect of white phosphorus on eukaryotic cells.

scholarly journals Uses of Therapeutic Laser in Pediatric Dentistry: Review of the Literature. Case Reports

2018 ◽  
Vol 20 (3) ◽  
pp. 51-59
Author(s):  
Miguel A. Rosales B. M.E. ◽  
Gabriela Torre D.M.E.P. ◽  
Lydia H. Saavedra Ch. C.D. ◽  
Raúl Márquez P. MEP ◽  
Ma. del Socorro Ruiz R. M.I.C. ◽  
...  
Keyword(s):  
Low Power ◽  
Case Reports ◽  
Pediatric Dentistry ◽  
Stimulated Emission ◽  
Review Of The Literature ◽  
Power Laser ◽  
Laser Technology ◽  
Evolution And Development ◽  
Light Amplification ◽  
Large Groups

The term "LASER" is an acronym for "Light Amplification by the Stimulated Emission of Radiation" (in Spanish "Amplificación de Luz por Emisión Estimulada de Radiación"). The use of laser technology in dentistry has had a constant evolution and development in the last 30 years. Two large groups of lasers should be distinguished: high-power or surgical and low-power or therapeutic. The most used in pediatric dentistry is the therapeutic or LLLT (or "soft"). The therapeutic laser is indicated for various anomalies such as hypersensitivity, gingivitis, herpes, paresthesias, trigeminal neuralgias, trismus, TMJ dysfunction, implants, activation of teeth whitening chemicals, among others. This article intends to perform an update of the applications of low power laser in the field of Pediatric Dentistry, as well as the presentation of 4 representative clinical cases.

Investigation of the antimicrobial activity at safe levels for eukaryotic cells of a low power atmospheric pressure inductively coupled plasma source

2015 ◽  
Vol 10 (2) ◽  
pp. 029519 ◽  
Author(s):  
Daniela Barbieri ◽  
Marco Boselli ◽  
Francesca Cavrini ◽  
Vittorio Colombo ◽  
Matteo Gherardi ◽  
...  
Keyword(s):  
Antimicrobial Activity ◽  
Low Power ◽  
Atmospheric Pressure ◽  
Inductively Coupled Plasma ◽  
Plasma Source ◽  
Eukaryotic Cells ◽  
Inductively Coupled

High resolution spot scan imaging of frozen, hydrated actin bundles with 400kV electrons

1992 ◽  
Vol 50 (1) ◽  
pp. 512-513
Author(s):  
J. Jakana ◽  
M.F. Schmid ◽  
P. Matsudaira ◽  
W. Chiu
Keyword(s):  
High Resolution ◽  
Binding Proteins ◽  
Actin Binding ◽  
Eukaryotic Cells ◽  
Dimensional Structure ◽  
Structural Basis ◽  
Actin Bundle ◽  
Actin Bundles ◽  
3 Dimensional ◽  
Macromolecular Assembly

Actin is a protein found in all eukaryotic cells. In its polymerized form, the cells use it for motility, cytokinesis and for cytoskeletal support. An example of this latter class is the actin bundle in the acrosomal process from the Limulus sperm. The different functions actin performs seem to arise from its interaction with the actin binding proteins. A 3-dimensional structure of this macromolecular assembly is essential to provide a structural basis for understanding this interaction in relationship to its development and functions.

Structure of clathrin cages and coats in ice

1986 ◽  
Vol 44 ◽  
pp. 94-97
Author(s):  
G.P.A. Vigers ◽  
R.A. Crowther ◽  
B.M.F. Pearse
Keyword(s):  
Electron Microscopy ◽  
Heavy Chain ◽  
Outer Part ◽  
Coated Vesicles ◽  
Eukaryotic Cells ◽  
Coat Proteins ◽  
Terminal Domain ◽  
Clathrin Heavy Chain ◽  
Membrane Components

Clathrin forms the polyhedral cage of coated vesicles, which mediate the transfer of selected membrane components within eukaryotic cells. Clathrin cages and coated vesicles have been extensively studied by electron microscopy of negatively stained preparations and shadowed specimens. From these studies the gross morphology of the outer part of the polyhedral coat has been established and some features of the packing of clathrin trimers into the coat have also been described. However these previous studies have not revealed any internal details about the position of the terminal domain of the clathrin heavy chain, the location of the 100kd-50kd accessory coat proteins or the interactions of the coat with the enclosed membrane.

The Hierarchic Order of Intermediate Filament Structure and Assembly

1985 ◽  
Vol 43 ◽  
pp. 722-725
Author(s):  
U. Aebi ◽  
E.C. Glavaris ◽  
R. Eichner
Keyword(s):  
Tissue Specificity ◽  
Structural Model ◽  
Eukaryotic Cells ◽  
Cdna Sequencing ◽  
Filament Structure ◽  
Keratin Filaments ◽  
Isoelectric Points ◽  
Immunological Crossreactivity

Five different classes of intermediate-sized filaments (IFs) have been identified in differentiated eukaryotic cells: vimentin in mesenchymal cells, desmin in muscle cells, neurofilaments in nerve cells, glial filaments in glial cells and keratin filaments in epithelial cells. Despite their tissue specificity, all IFs share several common attributes, including immunological crossreactivity, similar morphology (e.g. about 10 nm diameter - hence ‘10-nm filaments’) and the ability to reassemble in vitro from denatured subunits into filaments virtually indistinguishable from those observed in vivo. Further more, despite their proteinchemical heterogeneity (their MWs range from 40 kDa to 200 kDa and their isoelectric points from about 5 to 8), protein and cDNA sequencing of several IF polypeptides (for refs, see 1,2) have provided the framework for a common structural model of all IF subunits.

Telepractice for Adult Speech-Language Pathology Services: A Systematic Review

2020 ◽  
Vol 5 (1) ◽  
pp. 326-338 ◽  
Author(s):  
Kristen Weidner ◽  
Joneen Lowman
Keyword(s):  
Systematic Review ◽  
Primary Progressive Aphasia ◽  
Future Research ◽  
Service Delivery Model ◽  
Speech Language Pathology ◽  
Review Of The Literature ◽  
Research Designs ◽  
Assessment And Treatment ◽  
Language Pathology ◽  
Screening Assessment

Purpose We conducted a systematic review of the literature regarding adult telepractice services (screening, assessment, and treatment) from approximately 2014 to 2019. Method Thirty-one relevant studies were identified from a literature search, assessed for quality, and reported. Results Included studies illustrated feasibility, efficacy, diagnostic accuracy, and noninferiority of various speech-language pathology services across adult populations, including chronic aphasia, Parkinson's disease, dysphagia, and primary progressive aphasia. Technical aspects of the equipment and software used to deliver services were discussed. Some general themes were noted as areas for future research. Conclusion Overall, results of the review continue to support the use of telepractice as an appropriate service delivery model in speech-language pathology for adults. Strong research designs, including experimental control, across multiple well-described settings are still needed to definitively determine effectiveness of telepractice services.

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