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Register a new userEffect of Electric Field of deferent frequencies; on RBCs After being Irradiated by (690μW) of He-Ne Laser
تأثير مجال كهربائي بترددات مختلفة؛ في كريات الدم الحمراء بعد تعريضها لأشعة ليزر الهليوم - نيون (690μW)
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Damascus University ورقة بحثية
Publication date
2012
fields
Physics
and research's language is
العربية
Created by
Shamra Editor
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قمنا في هذه الدراسة بتطبيق مجال كهربي بترددات مختلفة (3MHz – 20Hz) على كريـات الـدم الحمراء بعد تعريضها لأشعة ليزر الهليوم – نيون ذي القدرة المنخفضة 690μW؛ و حساب هـشاشتها التناضحية، و بعض الخواص الكهربية لها كثابت العزل و التوصيلية الكهربائية لها.
This study focuses on studying the effects of Electric Field of deferent frequencies (20Hz – 3MHz), on RBCs after being irradiated by (690μW) of He- Ne Laser, with testing some blood characteristics like osmotic fragility, Conductivity and Dielectric constant.
References used
Parpart, A. K., Lorenz, P.B., Parpart, E. R., Greegg, J. R. and Chase, A. M. (1947). The osmotic resistance (fragility) of human red cells. Journal of Clinical Investigation, 26, 636
Brill, Alexander G.; Brill, Grigory E; Shenkman, Boris; Tamarin, Ilya; Dardik, Rima; Varon, David; Savion, Naphtali. (1999, 1998). Low power laser irradiation of blood inhibits platelet function: Role of cyclic GMP. Proceedings of SPIE-The International Society for Optical Engineering (3569), Proceedings of the Effects of Low-Power Light on Biological Systems IV, Stockholm,SWE, p 4-11
Olban, M., Wachowicz, B., Koter, M., Bryszewska, M. (1998). The biostimulatory effect of red laser irradiation on big blood platelet function, Cell Biol. Int.22(3) 245-248
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The aim of this paper is to test the influence of the laser brightness on the
retina of eye of lacerta laevis, and the value of the distortion or damage in the
construction of photoreceptors (Cones), which are responsible of the viewing
process or
in the pigmentary epithelial layer which protect from the high light
intensity.
On the other hand, the continuation of the exposure to the He- Ne laser
beam the number of the damaged cells, that causes the loss of entire
photoreceptor layer. The results show similar effects at specular reflection.
Hence, it is very important to pay attention to the hazard emerged from the
laser beam in visible range, which requires to apply the special goggles, as well
as to keep the laser pointers out of reach of children.
Our results assured the presence of functional association between the
pigment epithelium (P.E) and photoreceptors of eye retina of lacerta laevis. The
continuous effect of He-Ne laser on eye produce dangerous structure changes
(according to studi
es by transmission electron microscope) led to damage of
parts and organelles of pigment epithelium and photoreceptors of eye retina.
The displacement of the epithelium from the photoreceptors layer was the first
dangerous results on vision (Retinal detachment). This detachment conduced to
no protection of photoreceptors from high intense light (which usually
maintained by melanin pigments spread in epithelium cells surrounding the
outer segments [O.S] of photoreceptors) so that the outer segments of
photoreceptor became under the influence of intense light of He-Ne laser which
conduced to damage of cytoplasmic membrane of outer segment disks and
damage of chemical structure of visual pigments (pigment necessary for
discrimination of color in cones) so the photo sensible pole lost its function in
transferring the sign of light necessary for vision. The lesion happened by the
influence of He-Ne laser in the cones, associated by dangerous changes in the
retardation of nucleus size and damage of chromatin material and the absence
of organelles responsible for biological synthesis of cellular protein, and
deconstruction of glycogen molecules (energy mols.). The most dangerous thing
is the resulted damage of synaptic pedicle of cones (lost of connection between
bipolar nerve cells and synaptic ribbons) so the neurotransmission pole lost its
function in neurotransmission across the layer of neurosynapsis of retina. The
damaged photoreceptor cells (cones) (which were almost dead) became disables
to do their function in vision.
This study was performed in the faculty of dental medicine –Damascus university.
the studied sample contained 30 patients in need for surgical extraction of third inferior
molar. A dose of 2 grams of amoxicillin was administered an hour before surg
ery to 15
patients. The oral health was assessed using plaque index and gingivitis index. 5ml of
venous blood was taken pre and post surgery. Blood was then put in special glass bottles
and incubated in 37c for five days, then the blood samples were cultured on blood agar and
MacConkey's agar and then searched for any bacterial growth
bacterimia percentage was 0% before surgery in all study participants, while it was
71.4% with amoxicillin and 42.9% without amoxicillin.
we seek to ensure laser stability , during its work , with time , and consistency of specifications and efficiency (returns), the cooling of the active medium and optical elements, are sensitive to the proper cooling method, in economic terms and in
terms ease of work.
Cooling technique helps prolonging the life of laser systems ,its stability and optimizing its operation. So the total cooling efficient lasers , Scientific and Industrial is essential when designing a laser and helps improving the specifications of lasers , gaseous or solid or semiconductor . In addition to that cooling has a good impact on the age of the laser , and safety of its use .
The designed cooling system , necessary for a certain laser system , depends on the amount of heat generated from the system(in Joule), which must be removed by the cooling system to keep the laser at specific temperature
The of this study was to evaluate the bonding strength of a
posterior composite restorations when two different types of
equipment methods were used for preparation of dentin (Erbium-doped
yttrium aluminum garnet laser (Er:YAG ) and diamond burs).
This study specimen consisted of Eighty molars, was divided
randomly into two main groups (40 molars were prepared with
diamond burs, and 40 molars were prepared with laser Er: YAG).
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