Replicate cultures of the yeast Saccharomyces cerevisiae were irradiated with 632.8 nm coherent light from He-Ne lasers at irradiances of 6.5 x 10(15) and 1.0 x 10(16) photons s-1 cm-2. Irradiation periods ranged from 0 to 652 min, and cultures were grown until well into the exponential phase. Unirradiated control cultures were grown alongside the irradiated cultures under otherwise identical conditions. The extents of growth in the control and irradiated cultures were compared spectrophotometrically at the end of each experiment. Contrary to the expectations of Karu et al. (e.g. Karu, 1988, Lasers Life Sci. 2, 53-74) no growth enhancement was found in the irradiated cultures, but a mild inhibitory effect was observed.
Download full-text PDF |
Source |
|---|---|
| http://dx.doi.org/10.1111/j.1751-1097.1993.tb02286.x | DOI Listing |
Publication Analysis
Top Keywords
Similar Publications
Macrophage activity modulation via synergistic effect of a porous substrate and low-field laser therapy.
Acta Bioeng Biomech
June 2024
1Institute of Applied Sciences, Academy of Physical Education, Kraków, Poland.
: The aim of this study was to investigate the effect of substrate - polycaprolactone (PCL)-based porous membrane modified with rosmarinic acid (RA), (PCL-RA) and to determine the optimal values of low field laser irradiation (LLLT) as stimulators of biological response of RAW 264.7 macrophages. : The porous polymer membrane was obtained by the phase inversion method, the addition of rosmarinic acid was 1%wt.
View Article and Find Full Text PDFThe effect of low energy LED red light on osteogenetic differentiation of periodontal ligament stem cell via the ERK5 signal pathway.
Lasers Med Sci
January 2025
The Department of Preventive Dentistry, The Affiliated Stomatological Hospital, Southwest Medical University, Luzhou, 646000, China.
The purpose of this study was to examine how low-energy LED red light influences the early to middle stage of osteogenic differentiation of periodontal ligament stem cells (PDLSCs) via the ERK5 signaling pathway. METHODS: PDLSCs were extracted from periodontal membrane tissue using enzymatic digestion. At three time points of 7, 10, and 14 days after irradiation with 5J/cm LED red light, the expression levels of early to middle-stage osteogenic-related genes ALP, Col-1, BSP, and OPN were detected by real-time fluorescence quantitative PCR(qRT-PCR) in both control and osteogenesis experimental groups.
View Article and Find Full Text PDFPhotoregulation of the biosynthetic activity of fungus using colloidal solutions of biogenic metal nanoparticles and low-intensity laser radiation.
Bioengineered
December 2025
Department of Translational Medical Bioengineering, National Technical University of Ukraine "Igor Sikorsky Kyiv Polytechnic Institute", Kyiv, Ukraine.
This article presents new data on the integrated use of colloidal solutions of nanoparticles and low-intensity laser radiation on the biosynthetic activity of the medicinal mushroom . Traditional mycological methods, colloidal solutions of biogenic metals, and unique photobiological methods have also been used. It was found that colloidal solutions of nanoparticles of all metals used increased the growth characteristics of (55-60%), while irradiation of the fungal inoculum with laser light in a medium with nanoparticles reduced the growth activity of mycelia by 12.
View Article and Find Full Text PDFInfluence of dual-cure resin-cement curing modes on gingival cytotoxicity and inflammatory responses.
J Dent Sci
January 2025
Division of Molecular & Regenerative Prosthodontics, Tohoku University Graduate School of Dentistry, Sendai, Japan.
Background/purpose: Dual-cure resin-cements are used for various dental restorations. However, whether the curing modes of these resin-cements influence gingival inflammation remains unclear. Hence, herein, we evaluated the effects of dual-cure resin-cement curing modes on gingival cytotoxicity and inflammatory responses.
View Article and Find Full Text PDFPCR-based detection technique and gamma irradiation strategies for managing -induced brown rot of potato.
Int J Radiat Biol
January 2025
Department of Horticulture, Patuakhali Science and Technology University, Patuakhali, Bangladesh.
Purpose: The study focused on developing a rapid PCR-based detection method and employing gamma irradiation techniques to manage , aiming to produce brown rot-free export-quality potatoes. This initiative seeks to enhance potato exports from Bangladesh.
Materials And Methods: Samples of potato tubers and soil were collected from various commercially significant potato-growing areas, resulting in a total of 168 isolates from potato tubers and soil across 12 regions.
Want 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!