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In this study we examined the effect of pulse Nd:YAG laser radiation on the cowpea beetle (Callosobruchus maculates(Fab)) in terms of changes in the external appearance of this insect (shape and color), and calculated the percentage of death rate due to Nd:YAG laser irradiation of wavelength (1064 nm) with energies: (300, 360, 420 & 480) mJ and exp...
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... work does not require vacuum technology or large space, the process is done without contact with the material, there are no specific specifications for the materials that can be treated by laser, and laser beam can reach places where other techniques are not accessible [20]. ' Figure 2' shows the interaction mechanism which includes reflection, refraction, absorption, and beam propagation within the tissue [17]. ...
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... As a result, the material optical properties may change significantly during laser irradiation. In addition, when heated, the material's thermal properties change slightly [19] [20]. Figure 1 shows the mechanism of laser-matter interaction [21]. ...
... Scientists and specialists in this subject strive continuously on the most important aspects of biophysics, which resulted in the growth of various technologies and applications in this field [1]. One of the most important of these technologies is laser because of its wide applications in various fields of life [2], also it has been widely used for many biological purposes [3]. ...
... Several studies have demonstrated the catalytic effects of laser beam at the molecular and cellular level [3]. Rays that reach living tissues can be reflected, scattered, absorbed, or transmitted to the surrounding tissues. ...
... The respiratory chain of mitochondria in a biological cell is affected by laser, also it changes the electrical potential of cell membranes affects their selective transmittance to some ions, or the activity of some enzymes may increase. It may also double the DNA and lead to collagen production, cell proliferation or alteration of their motor properties [3]. The characteristics of the tissues as well as the properties of laser source are the two factors that depend on how laser affects the tissues themselves [16]. ...
The subject of biophysics is interdisciplinary and covers various fields of biology and physics. In this research the effect of some parameters of Nd:YAG laser on ants (Camponotus consobrinus) has been studied . This includes the effect on its external shape, as well as the percentage of the killing rate obtained. A laser radiation of a wavelength (1.064 µm) with different energies: (300, 320, 340, 360, 380 and 480 mJ) was used to irradiate ants placed at a distance of (10 cm) distance from the laser source . The irradiation times were (15 and 20 sec) for each energy. The obtained results showed an increase in the rate of ant mortality, as well as an increase in deformations, as the laser energy and the irradiation time increased. These results were recorded after different time periods (12, 24, 48 and 72 hours) after laser treatment.. The thermal diffusion within the tissues resulting from laser radiation causes increased death rates due to damage of internal structures.
... One of the important topics that cover many and wide fields in physics and biology is the topic of biophysics, and the efforts of scientists specialized in this topic have led to its development by focusing on the main aspects that have developed many applications, techniques, and researches [1]. The most effective technique in this aspect is the laser, due to the important applications of its [2]. Humans live alongside insects, which in turn affect our lives in many different ways [3]. ...
We review the literature concerning the effects of laser light on organisms (insects) and microorganisms (bacteria, viruses, fungi) present in agri-food systems. The evidence obtained shows that 1) Laser light is a sustainable technology that can be applied as a pesticide with the ability to annihilate and control insects. Higher annihilation rates are observed for more pigmented products, as determined by their thermal and optical properties. 2) The most frequently used laser beams to eliminate bacteria harmful to human health operate with a steady intensity in the visible domain (blue, green, and red light). 3) Laser beams are applied to control fungi (the most studied microorganism), viruses, as well as to increase plant resistance to them. Lasers with red beams, such as those emitted by He-Ne lasers, followed by diode lasers are most frequently reported in fungal control. Furthermore, antibacterial, and germicidal effects are increased by using photosensitizers. Finally, 4) laser light potentiates the metabolites and antimicrobial activity of some plants thereby improving their activity. Agri-food systems treated with laser beams have the potential to improve the quality of life of society.
Biophysics subject covers multiple fields of physics and biology. In this research the effect of some parameters of diode laser has been experimented with ants (Camponotus consobrinus) which includes the effect on its external shape, as well as the percentage of the killing rate obtained as a result of laser radiation at a wavelength (532 nm) with power (200 mW), at distances: (10, 12, and 14 cm) between laser source and the insect, and exposure times (10, 15 and 20 sec) for each distance. The obtained results showed an increase in the rate of ant killing, as well as an increase in deformations where the distance decreased and laser exposure time increased. These results were recorded after time periods after laser treatment, which are as follows: (12, 24, 48 and 72 h). The thermal diffusion within the tissues resulting from laser radiation causes increased death rates due to damage of internal structures.
