Biological effects of semiconductor laser irradiation on peanut seeds

Aim of the study was to compare the cutting and coagulation properties of 1.56 and 1.94 μm fiber lasers with those of a 0.98 μm semiconductor laser.Materials and methods. A comparative study of the biological effects of 1.56 and 1.94 µm lasers and a 0.98 µm semiconductor laser used in a constant, continuous mode was carried out. The cutting properties of the lasers were evaluated on the chicken muscle tissue samples by the width and depth of the ablation zone formed via a linear laser incision at a speed of 2 mm/s, while the coagulation properties were assessed by the width of the lateral coagulation zone. The zones were measured using a surgical microscope and a calibration slide. For statistical analysis, power values of 3, 5, 7, 9, and 11 W were chosen for each laser wavelength.Results. Analysis of the findings confirmed that laser wavelength had a statistically significant effect on the linear dependence between incision parameters and laser power. It was found that the 1.56 μm fiber laser (water absorption) had a greater coagulation ability but a comparable cutting ability compared with the 0.98 μm laser (hemoglobin absorption). When used in the power mode of 7W or higher, the 1.94 µm laser provided superior cutting performance compared with the 0.98 µm semiconductor laser at the same exposure power. Elevating the power in any of the lasers primarily increased the width of the ablation zone, and to a lesser extent – the crater depth and the width of the lateral coagulation zone. Therefore, in comparison with the 0.98 μm semiconductor laser, higher radiation power in the 1.56 and 1.94 μm lasers mainly influences their cutting properties, expanding the width and depth of the ablation zone, and has a smaller effect on their coagulation ability.Conclusion. The findings of the study showed that the 1.56 and 1.94 μm fiber lasers have better coagulation properties in comparison with the 0.98 μm semiconductor laser. was statistically proven that all incision characteristics (width of the lateral coagulation zone, depth and width of the ablation zone) for the 1.56, 1.94, and 0.98 μm lasers depend on the power of laser radiation. The 1.94 µm laser is superior to the 0.98 µm laser in its cutting properties.

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Infrared semiconductor laser irradiation used for crystallization of silicon thin films

Journal of Non-Crystalline Solids ◽

10.1016/j.jnoncrysol.2011.12.030 ◽

2012 ◽

Vol 358 (17) ◽

pp. 2162-2165

Author(s):

T. Sameshima ◽

M. Hasumi

Keyword(s):

Thin Films ◽

Semiconductor Laser ◽

Laser Irradiation ◽

Silicon Thin Films

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The Biological Effects of Low Power Laser Irradiation on Cultivated Rat Glial and Glioma Cells

Journal of Clinical Laser Medicine & Surgery ◽

10.1089/clm.1991.9.35 ◽

1991 ◽

Vol 9 (1) ◽

pp. 35-41 ◽

Cited By ~ 5

Author(s):

Jui-Chang Tsai ◽

Ming-Chien Kao

Keyword(s):

Low Power ◽

Laser Irradiation ◽

Biological Effects ◽

Glioma Cells ◽

Power Laser

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Biological effects of low-level laser irradiation (LLLI) on stem cells from human exfoliated deciduous teeth (SHED)

Clinical Oral Investigations ◽

10.1007/s00784-019-02874-4 ◽

2019 ◽

Vol 24 (1) ◽

pp. 167-180 ◽

Cited By ~ 2

Author(s):

M. Paschalidou ◽

E. Athanasiadou ◽

K. Arapostathis ◽

N. Kotsanos ◽

P. T. Koidis ◽

...

Keyword(s):

Stem Cells ◽

Laser Irradiation ◽

Biological Effects ◽

Deciduous Teeth ◽

Low Level ◽

Low Level Laser ◽

Level Laser ◽

Low Level Laser Irradiation ◽

Human Exfoliated Deciduous Teeth

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In Vitro Cytological Responses against Laser Photobiomodulation for Periodontal Regeneration

International Journal of Molecular Sciences ◽

10.3390/ijms21239002 ◽

2020 ◽

Vol 21 (23) ◽

pp. 9002

Author(s):

Yujin Ohsugi ◽

Hiromi Niimi ◽

Tsuyoshi Shimohira ◽

Masahiro Hatasa ◽

Sayaka Katagiri ◽

...

Keyword(s):

Gene Expression ◽

Endothelial Cells ◽

Laser Irradiation ◽

Biological Effects ◽

Periodontal Regeneration ◽

Chronic Inflammatory Disease ◽

Periodontal Ligament Cells ◽

Positive Effects ◽

Periodontal Tissues

Periodontal disease is a chronic inflammatory disease caused by periodontal bacteria. Recently, periodontal phototherapy, treatment using various types of lasers, has attracted attention. Photobiomodulation, the biological effect of low-power laser irradiation, has been widely studied. Although many types of lasers are applied in periodontal phototherapy, molecular biological effects of laser irradiation on cells in periodontal tissues are unclear. Here, we have summarized the molecular biological effects of diode, Nd:YAG, Er:YAG, Er,Cr:YSGG, and CO2 lasers irradiation on cells in periodontal tissues. Photobiomodulation by laser irradiation enhanced cell proliferation and calcification in osteoblasts with altering gene expression. Positive effects were observed in fibroblasts on the proliferation, migration, and secretion of chemokines/cytokines. Laser irradiation suppressed gene expression related to inflammation in osteoblasts, fibroblasts, human periodontal ligament cells (hPDLCs), and endothelial cells. Furthermore, recent studies have revealed that laser irradiation affects cell differentiation in hPDLCs and stem cells. Additionally, some studies have also investigated the effects of laser irradiation on endothelial cells, cementoblasts, epithelial cells, osteoclasts, and osteocytes. The appropriate irradiation power was different for each laser apparatus and targeted cells. Thus, through this review, we tried to shed light on basic research that would ultimately lead to clinical application of periodontal phototherapy in the future.

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