The Experts below are selected from a list of 95262 Experts worldwide ranked by ideXlab platform
A. R. C. Morosolli - One of the best experts on this subject based on the ideXlab platform.
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Surgical treatment of ranula with carbon dioxide Laser Radiation
Lasers in Medical Science, 2004Co-Authors: W. Niccoli-filho, A. R. C. MorosolliAbstract:Ranula is a mucous extravasation cyst which appears as a swelling in the submental and submandibular regions. Several surgical techniques to manage ranula have been described in the literature, these techniques include the CO_2 Laser Radiation excision. Four patients were treated for intraoral ranula in the floor of the mouth by marsupialization with carbon dioxide Laser Radiation with defocused beam, continuous mode and 4 watts of power. There were no complications and no recurrences have occurred to date. The results showed that carbon dioxide Laser Radiation gives optimal results with no need for suture and good wound healing.
W. Niccoli-filho - One of the best experts on this subject based on the ideXlab platform.
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Surgical treatment of ranula with carbon dioxide Laser Radiation
Lasers in Medical Science, 2004Co-Authors: W. Niccoli-filho, A. R. C. MorosolliAbstract:Ranula is a mucous extravasation cyst which appears as a swelling in the submental and submandibular regions. Several surgical techniques to manage ranula have been described in the literature, these techniques include the CO_2 Laser Radiation excision. Four patients were treated for intraoral ranula in the floor of the mouth by marsupialization with carbon dioxide Laser Radiation with defocused beam, continuous mode and 4 watts of power. There were no complications and no recurrences have occurred to date. The results showed that carbon dioxide Laser Radiation gives optimal results with no need for suture and good wound healing.
Nathaniel M Fried - One of the best experts on this subject based on the ideXlab platform.
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hybrid germanium silica optical fibers for endoscopic delivery of erbium yag Laser Radiation
Lasers in Surgery and Medicine, 2004Co-Authors: Charles A Chaney, Yubing Yang, Nathaniel M FriedAbstract:Background and Objectives Endoscopic applications of the erbium (Er):YAG Laser have been limited due to the lack of an optical fiber delivery system that is robust, flexible, and biocompatible. This study reports the testing of a hybrid germanium/silica fiber capable of delivering Er:YAG Laser Radiation through a flexible endoscope. Study Design/Materials and Methods Hybrid optical fibers were assembled from 1-cm length, 550-μm core, silica fiber tips attached to either 350- or 425-μm germanium oxide “trunk” fibers. Er:YAG Laser Radiation (λ = 2.94 μm) with Laser pulse lengths of 70 and 220 microseconds, pulse repetition rates of 3–10 Hz, and Laser output energies of up to 300 mJ was delivered through the fibers for testing. Results Maximum fiber output energies measured 180±30 and 82±20 mJ (n = 10) under straight and tight bending configurations, respectively, before fiber interface damage occurred. By comparison, the damage threshold for the germanium fibers without silica tips during contact soft tissue ablation was only 9 mJ (n = 3). Studies using the hybrid fibers for lithotripsy also resulted in fiber damage thresholds (55–114 mJ) above the stone ablation threshold (15–23 mJ). Conclusions Hybrid germanium/silica fibers represent a robust, flexible, and biocompatible method of delivering Er:YAG Laser Radiation during contact soft tissue ablation. However, significant improvement in the hybrid fibers will be necessary before they can be used for efficient Er:YAG Laser lithotripsy. Lasers Surg. Med. 34:5–11, 2004. © 2004 Wiley-Liss, Inc.
Jolanta Kujawa - One of the best experts on this subject based on the ideXlab platform.
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influence of mls Laser Radiation on erythrocyte membrane fluidity and secondary structure of human serum albumin
Molecular and Cellular Biochemistry, 2014Co-Authors: Kamila Pasternak, Olga Nowacka, Dominika Wrobel, Ireneusz Pieszynski, Maria Bryszewska, Jolanta KujawaAbstract:The biostimulating activity of low level Laser Radiation of various wavelengths and energy doses is widely documented in the literature, but the mechanisms of the intracellular reactions involved are not precisely known. The aim of this paper is to evaluate the influence of low level Laser Radiation from an multiwave locked system (MLS) of two wavelengths (wavelength = 808 nm in continuous emission and 905 nm in pulsed emission) on the human erythrocyte membrane and on the secondary structure of human serum albumin (HSA). Human erythrocytes membranes and HSA were irradiated with Laser light of low intensity with surface energy density ranging from 0.46 to 4.9 J cm−2 and surface energy power density 195 mW cm−2 (1,000 Hz) and 230 mW cm−2 (2,000 Hz). Structural and functional changes in the erythrocyte membrane were characterized by its fluidity, while changes in the protein were monitored by its secondary structure. Dose-dependent changes in erythrocyte membrane fluidity were induced by near-infrared Laser Radiation. Slight changes in the secondary structure of HSA were also noted. MLS Laser Radiation influences the structure and function of the human erythrocyte membrane resulting in a change in fluidity.
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effect of low intensity 3 75 25 j cm2 near infrared 810 nm Laser Radiation on red blood cell atpase activities and membrane structure
Journal of Clinical Laser Medicine & Surgery, 2004Co-Authors: Jolanta Kujawa, Leu Zavodnik, I B Zavodnik, Vyacheslav Buko, Alena Lapshyna, Maria BryszewskaAbstract:Objective: The biostimulation and therapeutic effects of low-power Laser Radiation of different wavelengths and light doses are well known, but the exact mechanism of action of the Laser Radiation with living cells is not yet understood. The aim of the present work was to investigate the effect of Laser Radiation (810 nm, radiant exposure 3.75-25 J/cm2) on the structure of protein and lipid components of red blood cell membranes and it functional properties. The role of membrane ATPases as possible targets of Laser irRadiation was analyzed. Background Data: A variety of studies both in vivo and in vitro showed significant influence of Laser irRadiation on cell functional state. At the same time another group of works found no detectable effects of light exposure. Some different explanations based on the light absorption by primary endogenous chromophores (mitochondrial enzymes, cytochromes, flavins, porphyrins) have been proposed to describe biological effects of Laser light. It was suggested that optimiz...
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low intensity near infrared Laser Radiation induced changes of acetylcholinesterase activity of human erythrocytes
Journal of Clinical Laser Medicine & Surgery, 2003Co-Authors: Jolanta Kujawa, Leu Zavodnik, I B Zavodnik, Maria BryszewskaAbstract:Objective: The aim of the present study was to investigate the transformations of red blood cells produced by low-intensity infrared Laser Radiation (810 nm). Background Data: Low-intensity (the output power of a Laser device in the milliwatt range) Laser Radiation as a local phototherapeutic modality is characterized by its ability to induce non-thermic, nondestructive photobiological processes in cells and tissues. However, the exact theory concerning the therapeutic effects of Laser biostimulation has not been developed. Materials and Methods: The suspensions of human erythrocytes in PBS (10% hematocrit) were irradiated with near-infrared (810 nm) therapy Laser at different light doses (0-20 J) and light power (fluence rate; 200 or 400 mW) at 37°C. As the parameters characterizing the cell structural and functional changes membrane acetylcholinesterase (AchEase) activity, the membrane potential, the level of intracellular glutathione, the level of products of membrane lipid peroxidation, and the cell o...
Nguyen Thi Thanh Nhan - One of the best experts on this subject based on the ideXlab platform.
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negative absorption coefficient of a weak electromagnetic wave caused by electrons confined in rectangular quantum wires in the presence of Laser Radiation modulated by amplitude
Progress in Electromagnetics Research M, 2014Co-Authors: Nguyen Thi Thanh Nhan, Dinh Quoc VuongAbstract:The analytic expressions for the absorption coefficient (ACF) of a weak electromagnetic wave (EMW) by confined electrons in rectangular quantum wires (RQWs) in the presence of Laser Radiation modulated by amplitude are calculated by using the quantum kinetic equation for electrons with the electron-optical phonon scattering mechanism. Then, the analytic results are numerically calculated and discussed for GaAs/GaAsAl RQWs. The numerical results show that the ACF of a weak EMW in a RQW can have negative values, which means that in the presence of Laser Radiation (non-modulated or modulated by amplitude), under proper conditions, the weak EMW is increased. This is different from the similar problem in bulk semiconductors and from the case of the absence of Laser Radiation. The results also show that in some conditions, when Laser Radiation is modulated by amplitude, ability to increase a weak EMW can be enhanced in comparison with the use of non- modulated Laser Radiation. Quantum wires are one-dimensional semiconductor structures. In quantum wires, many the physical properties of the material changes significantly from the properties of normal bulk semiconductors, including optical properties (1, 2). The linear absorption of a weak EMW and the nonlinear absorption of a strong EMW in low-dimensional systems have been studied (3-6). The influence of Laser Radiation on the absorption of a weak EMW in normal bulk semiconductors, quantum wells and cylindrical quantum wires have been investigated using the quantum kinetic equation method (7-10). The influence of Laser Radiation (non-modulated and modulated by amplitude) on the absorption of a weak EMW in component superlattices has been investigated by using the Kubo-Mori method (11). However, the influence of Laser Radiation modulated by amplitude on the absorption of a weak EMW in RQW are still unsolved. Therefore, in this paper, we theoretically calculate the ACF of a weak EMW caused by electrons confined in a RQW in the presence of Laser Radiation modulated by amplitude by using the quantum kinetic equation for electrons. The electron-optical phonon scattering mechanism is considered. The results are numerically calculated for the specific case of GaAs/GaAsAl RQW. We show that the ACF of a weak EMW in a RQW can have negative values. That means that in the presence of Laser Radiation (non-modulated or modulated by amplitude), under proper conditions, the weak EMW is increased; and in some conditions, when Laser Radiation is modulated by amplitude, ability to increase a weak EMW can be enhanced in comparison with the use of non-modulated Laser Radiation.
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calculation absorption coefficient of a weak electromagnetic wave by confined electrons in cylindrical quantum wires in the presence of Laser Radiation by using the quantum kinetic equation
Progress in Electromagnetics Research M, 2014Co-Authors: Nguyen Thi Thanh NhanAbstract:We calculated analytic expressions for the absorption coe-cient (ACF) of a weak electromagnetic wave (EMW) by conflned electrons in cylindrical quantum wires (CQW) in the presence of Laser Radiation by using the quantum kinetic equation for electrons in the case of electron-optical phonon scattering. The ACF of a weak EMW depends on the intensity E01 and frequency ›1 of the external Laser Radiation (~ E1 = ~ E01 sin(›1t+'1)); the intensity E02 and frequency ›2 of the weak EMW ( ~ E2 = ~ E02 sin(›2t)), the temperature T of the system and the radius R of CQW. Then, the analytic results are numerically calculated and discussed for GaAs=GaAsAl CQW. The numerical results show that the ACF of a weak EMW in a CQW can have negative values. So, in the presence of Laser Radiation, under proper conditions, the weak EMW is increased. This is difierent from the similar problem in bulk semiconductors and from the case of the absence of Laser Radiation.
