scholarly journals Effects of Low Intensity Red Light on Testicular Recrudescence in Japanese Quail

1981 ◽  
Vol 60 (2) ◽  
pp. 453-461 ◽  
Author(s):  
R.P. GILDERSLEEVE ◽  
W.A. JOHNSON
Keyword(s):  
Japanese Quail ◽  
Red Light ◽  
Low Intensity ◽  
Testicular Recrudescence

LIGHT AND TEMPERATURE EFFECTS ON GROWTH AND SPOROPHORE FORMATION OF LENZITES TRABEA

1967 ◽  
Vol 45 (4) ◽  
pp. 525-530
Author(s):  
C. Madhosingh
Keyword(s):  
Temperature Effects ◽  
Growth Form ◽  
Red Light ◽  
Vegetative Mycelium ◽  
Temperature Growth ◽  
Low Intensity ◽  
Morphological Studies ◽  
Brown Pigmentation ◽  
Yellow Pigments ◽  
Red Radiation

Growth, pigmentation, and sporophore formation in Lenzites trabea, a polypore fungus, are shown to be affected by differences in light and temperature. Growth occurred under all conditions provided, being greater on liquid substrate than on agar and with maximum mycelium production in continuous red light at 25 °C. Sporophores, however, were formed only under certain continuous fluorescent and red radiations on liquid substrate; and on agar at 15 °C, 20 °C, and 25 °C in darkness broken by occasional brief exposures to low intensity daylight. The growth form under the red radiation and in darkness at 25 °C was similar. The form of fructification varied from poroid resupinate at 15 °C, to somewhat raised structures with larger pores at 20 °C, to an assemblage of discrete upright bodies with lacerated surface at 25 °C. Yellow-brown pigmentation was consistently associated with the fruiting areas in contrast with the predominantly fawn-yellow pigments of the vegetative mycelium. The significance of these results in comparative morphological studies is discussed.

scholarly journals Low-intensity, Long-wavelength Red Light Slows the Progression of Myopia in Children: an Eastern China-based Cohort

2021 ◽  
Author(s):  
Lei Zhou ◽  
Chao Xing ◽  
Wei Qiang ◽  
Chaoqun Hua ◽  
Liyang Tong
Keyword(s):  
Eastern China ◽  
Red Light ◽  
Spectral Composition ◽  
Enhanced Depth Imaging ◽  
Myopia Progression ◽  
Short Treatment ◽  
Binary Images ◽  
Low Intensity ◽  
Ambient Lighting ◽  
East And Southeast Asia

Abstract Myopia is prevalent worldwide, particularly in East and Southeast Asia. Recent studies have suggested that the spectral composition of ambient lighting influences refractive development, especially in humans. We aimed to determine the effect of 650-nm single-wavelength red light on the inhibition of myopia progression in children. In this retrospective cohort study, 105 myopic children (spherical equivalent refractive error [SER], -6.75 to -1.00 dioptres (D)) aged from 4 to 14 years old were retrospectively reviewed. Subjects were treated with 650-nm, low-intensity, single-wavelength red light twice a day for 3 minutes each session, with at least a 4-hour interval between sessions. IOL Master was utilized to measure the axial length (AL) and corneal curvature. Choroidal images were assessed using enhanced depth imaging optical coherence tomography (EDI-OCT), and the luminal area (LA) and stromal area were converted to binary images by the Niblack method. At baseline, the mean SER was -3.09 ± 1.74 D and -2.87 ± 1.89 D at 9 months, and significant changes occurred over time (P = 0.019). The AL increased by -0.06 ± 0.19 mm for 9 months (0.21 ± 0.15 mm pretreatment; P＜0.001). The subfoveal choroidal thickness (SFChT) had changed by 45.32 ± 30.88 μm at the 9-month examination (P＜0.001). Repetitive exposure to 650-nm, low-intensity, single-wavelength red light effectively slowed the progression of myopia and reduced axial growth after short treatment durations. These results require further validation in a longitudinal study, as well as further research in animal models.

Photoactivation of cytochrome с oxidase activity in liver mitochondria of Japanese quail by therapeutic doses of blue and red LED irradiation

2018 ◽  
pp. 25-30
Author(s):  
А.Е. Донцов ◽  
Н.Б. Сережникова ◽  
Л.С. Погодина ◽  
Т.С. Гурьева ◽  
П.П. Зак
Keyword(s):  
Cytochrome C ◽  
Cytochrome C Oxidase ◽  
Blue Light ◽  
Japanese Quail ◽  
Oxidase Activity ◽  
Red Light ◽  
Liver Mitochondria ◽  
Coturnix Japonica ◽  
Red Led ◽  
Led Irradiation

Цель исследования - выяснение влияния синего (450 нм) и красного (630 нм) светодиодного облучения различной энергетической экспозиции на активность митохондриальной цитохром с-оксидазы. Методики. Объектом исследования служили митохондрии, изолированные из печени японского перепела Coturnix japonica . Цитохром с-оксидазную активность измеряли по скорости окисления восстановленного тетраметил-р-фенилендиамина в присутствии ротенона. Результаты. Показано, что облучение митохондрий синим светом с энергетическими экспозициями, не превышающими 4 Дж/см вызывает примерно 5-15-процентную стимуляцию активности цитохром с-оксидазы, а дозы больше 5 Дж/см приводят к ингибированию активности фермента. Облучение митохондрий красным светом также оказывает стимулирующее действие (10-20%) на цитохром с-оксидазную активность по сравнению с необлученными образцами. Заключение. Предполагается, что низкодозовое облучение синим светом может иметь сходное с красным светом терапевтическое действие при фотобиомодуляции. The aim was to study the effect of blue (450 nm) and red (630 nm) LED irradiation with different energy exposures on activity of mitochondrial cytochrome c oxidase. Methods. The study was performed on mitochondria isolated from the liver of Japanese quail Coturnix japonica . Cytochrome c oxidase activity was measured by the rate of oxidation of reduced tetramethyl-p-phenylenediamine in the presence of rotenone. Results. Irradiation of mitochondria with blue light at doses not exceeding 4 J/cm caused approximately 5-15% stimulation of cytochrome c oxidase activity while doses higher than 5 J/cm led to inhibition of this enzyme. Irradiation of mitochondria with red light also exerted a slight stimulating effect (10-20%) on cytochrome c oxidase activity compared to unirradiated samples. Conclusion. The study suggested that low-dose irradiation with blue light may produce a therapeutic effect similar to red light in photobiomodulation.

Study of photobiomodulation effects with violet-blue and red light in experimental oncogenesis

2020 ◽  
Vol 60 (9) ◽  
pp. 618-623
Author(s):  
Evgeniya S. Zhukova ◽  
Tatiana G. Shcherbatyuk ◽  
Arseniy L. Potapov ◽  
Irina A. Chernigina ◽  
Vladimir V. Chernov ◽  
...  
Keyword(s):  
Free Radical ◽  
Tumor Growth ◽  
Electromagnetic Radiation ◽  
Electromagnetic Waves ◽  
Biological Effects ◽  
Red Light ◽  
Free Radical Processes ◽  
Low Intensity ◽  
Radical Processes

Introduction. There is still an open question about the limits of medical use of low-intensity electromagnetic radiation of the optical range in tumor growth due to the risk of increased proliferation of tumor cells. The conditions under which the tumor process is stimulated, as well as the mechanisms of photobiomodulation in oncological pathology, remain unclear. The aim of the study - in vitro evaluation and comparison of the effect of low-intensity electromagnetic radiation with wavelengths of 400, 460 and 660 nm on the activity of free-radical processes in tumor tissue and blood in normal and growing experimental neoplasia. Materials and methods. The study was conducted on biological material obtained from white non-linear rats intact and with subcutaneously transplanted cholangiocellular cancer MS-1. The sources of low-intensity radiation with wavelengths of 400, 460 and 660 nm were led generators. The content of hemoglobin, the activity of superoxide dismutase and catalase, changes in the overall level of free radical processes and antioxidant activity by induced chemiluminescence, and DNA damage by the method of DNA comets were studied. Data analysis was performed using nonparametric statistics methods. Results. The multidirectional effect of radiation with wavelengths of 400, 460 and 660 nm on free-radical homeostasis indicators at the early and late stages of tumor growth, as well as the dependence of biological effects on the wavelength of radiation, was found. Conclusions. The results obtained allow making a number of assumptions about the mechanisms of action of the optical electromagnetic waves on tumor growth, modulating free radical processes in the tumor-bearing organism.

scholarly journals Blue and red light effects on stomatal oscillations

2019 ◽  
Vol 46 (2) ◽  
pp. 146 ◽  
Author(s):  
Trevor Ballard ◽  
David Peak ◽  
Keith Mott
Keyword(s):  
Blue Light ◽  
Guard Cell ◽  
Red Light ◽  
Guard Cells ◽  
Surrounding Tissue ◽  
Single Pair ◽  
Fibre Optic ◽  
Fibre Optics ◽  
Cell Pair ◽  
Low Intensity

The response of stomata to red and blue light was investigated using small fibre optics (66µm diameter) to control light levels on a single pair of guard cells without affecting the surrounding tissue. Low intensity red light (50µmolm–2s–1) applied to the entire leaf caused stomata to oscillate continuously for several hours with no apparent decrease in amplitude with time. Adding low intensity blue light (50µmolm–2s–1) caused stomata to stop oscillating, but oscillations resumed when the blue light was removed. Adding the same intensity of red light to an oscillating leaf changed the amplitude of the oscillations but did not stop them. When blue light was added to a single guard cell pair (using a fibre optic) in a red-light-illuminated leaf, the stoma formed by that pair stopped oscillating, but adjacent stomata did not. Red light added to a single guard cell pair did not stop oscillations. Finally, blue light applied through a fibre optic to areas of leaf without stomata caused proximal stomata to stop oscillating, but distal stomata continued to oscillate. The data suggest that blue light affects stomata via direct effects on guard cells as well as by indirect effects on other cells in the leaf.

scholarly journals Low-Intensity Far-Red Light Inhibits Early Lesions That Contribute to Diabetic Retinopathy: In Vivo and In Vitro

2013 ◽  
Vol 54 (5) ◽  
pp. 3681 ◽  
Author(s):  
Johnny Tang ◽  
Yunpeng Du ◽  
Chieh Allen Lee ◽  
Ramaprasad Talahalli ◽  
Janis T. Eells ◽  
...  
Keyword(s):  
Diabetic Retinopathy ◽  
Red Light ◽  
Low Intensity ◽  
Early Lesions

scholarly journals Treatment of food waste digestate using microalgae-based systems with low-intensity light-emitting diodes

2018 ◽  
Vol 78 (1) ◽  
pp. 225-234 ◽  
Author(s):  
Andrés Felipe Torres Franco ◽  
Scarlet da Encarnação Araújo ◽  
Fabiana Passos ◽  
Carlos Augusto de Lemos Chernicharo ◽  
César Rossas Mota Filho ◽  
...  
Keyword(s):  
Solar Radiation ◽  
Food Waste ◽  
Light Emitting Diodes ◽  
Red Light ◽  
Oxygen Demand ◽  
Full Scale ◽  
Low Light ◽  
Light Emitting ◽  
Low Intensity ◽  
Soluble Chemical Oxygen Demand

Abstract Anaerobic digestion of food wastes coupled with digestate post-treatment using microalgae-based systems could recover large amounts of energy and nutrients worldwide. However, the development of full-scale implementations requires overcoming microalgae inhibition by high ammonia concentrations and low light transmittances affecting photosynthesis. This study evaluated the potential of microalgae-based reactors supplied with red light-emitting diodes (LEDs) at low intensity (660 nm and 15 µmol·m−2·s−1) to treat food waste digestate. LED reactors were compared with control reactors exposed to solar radiation. From a range of species in the inoculum, Chlorella vulgaris showed high adaptation to both lighting regimes and digestate environmental conditions, characterized by a C:N:P ratio of 74:74:1. Removal efficiencies for control and LED reactors were 84.0% and 95.8% for soluble chemical oxygen demand (COD) and 89.4% and 53.0% for ammonia, respectively. Approximately 50% of ammonia in control reactor and 15% in LED reactor was lost from the systems, whereas 17% and 36% of ammonia was transformed to organic nitrogen in control and LED reactors, respectively. Low-intensity LEDs maintained microalgae growth in levels similar to solar radiation and supported efficient digestate treatment, showing a potential for further application in optimization of full scale reactors at a relatively low energy cost.

scholarly journals Biostimulating Action of Low-Intensity Monochromatic Visible Light: Is it Possible?

1984 ◽  
Vol 5 (1) ◽  
pp. 19-25 ◽  
Author(s):  
T. I. Karu ◽  
O. A. Tiphlova ◽  
G. E. Fedoseyeva ◽  
G. S. Kalendo ◽  
V. S. Letokhov ◽  
...  
Keyword(s):  
Visible Light ◽  
Hela Cells ◽  
Red Light ◽  
Monochromatic Light ◽  
Action Spectrum ◽  
Exponential Growth Phase ◽  
E Coli ◽  
Low Intensity ◽  
Quantitative Studies ◽  
Saccharomycodes Ludwigii

The quantitative studies with organisms of different complexity (HeLa cells, yeast organisms, E coli bacteria) to prove or disprove the stimulating action of low-intensity visible light are presented. The stimulation of DNA synthesis in HeLa cells was observed for four spectral intervals with maxima at near 400, 620, 680 and 760 nm. The red light stimulates the growth of yeast (Saccharomycodes ludwigii) and E coli in exponential growth phase. The action spectrum of monochromatic light on the growth of these organisms in the red region is very similar to that for HeLa cells.

Shock Facilitation and Suppression of Alcohol- and Coke-Maintained Behavior

1972 ◽  
Vol 31 (2) ◽  
pp. 415-424 ◽  
Author(s):  
Robert S. Davidson ◽  
Edward S. Wallach
Keyword(s):  
Conditioned Reinforcement ◽  
Shock Intensity ◽  
Narrow Range ◽  
Light Flash ◽  
Red Light ◽  
The Other ◽  
Response Contingent ◽  
Low Intensity ◽  
The Subject

3 long-term alcoholic patients were introduced to concurrent FR30coke FR30alcohol (30 responses on one manipulandum followed by coke reinforcement, 30 on the other followed by liquor), allowed to stabilize in responding for their preferred reinforcer, then exposed to shock of low intensity contingent on each reinforced response. The shock schedule was accompanied by a distinctive SD (response-contingent red light flash). Shock intensity was increased after every one or two sessions until the subject switched to the other available manipulandum (and reinforcer). Two of three subjects showed increasing rates of response (conditioned reinforcement) correlated with increasing shock intensities, followed by the reverse (suppression) prior to a switch to the other manipulandum. One subject showed only shock suppression over a narrow range of intensities. Later introduction of the SD for shock (red light) was sufficient on most occasions to facilitate a switch prior to shock. Four such reversals were accomplished in each subject.

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