Hugo Juri

The use of an integral tissue expander® for primary breast reconstruction

The authors emphasize the recent advances in breast reconstruction provided by use of the skin expander device. A Silastic percutaneous skin expander developed by the authors and the Dow Corning Corporation has been used by them in breast reconstruction for the past 7 years with satisfactory results. Important design differences in the device suggested by the authors include the use of a reinforced backing which consists of Dacron Silastic sheeting extending beyond the inflatable teardrop-shaped envelope for approximately 3/8 of an inch, thus adding strength and rigidity to the envelope and the rim, and making it possible for the rim of the expander implant to be sutured in an appropriate orientation.

Ampliaciones de una Mediateca Digital de Muestras de Laboratorio Histopatológico

El objetivo general de accion de este proyecto es ampliar una mediateca digital consistente en imagenes de muestras histopatologicas obtenidas en la 2da. Catedra de Biologia Celular, Histologia y Embriologia de la Facultad de Ciencias Medicas Universidad Nacional de Cordoba, Argentina. Se proponen tres lineas de trabajo principales: 1- integracion de imagenes y documentos cientificos (abstract de articulos) mediante el uso de terminos ontologicos, 2- articulacion del listado de imagenes y documentos cientificos con herramientas de acceso a la informacion multimedia (imagenes y texto), 3- incorporacion de una traduccion simi-automatica ingles-espanol usando herramientas libres de traduccion automatica de lengua origen castellano a lengua de origen ingles. Creemos que la asociacion de diferentes herramientas de gestion del conocimiento permitiran ampliar una mediateca digital de muestras de laboratorio correspondientes a resultados de nuestros de trabajos de investigacion subsidiados por organismos oficiales. Tambien para que los contenidos de este proyecto esten disponibles para un amplio usuario de las Ciencias de la Salud con diferentes niveles de alfabetizacion funcional. Por ultimo nuestro proyecto permitira la inclusion de profesionales de la Escuela de Bibliotecologia y de la Facultad de Lenguas de nuestra Universidad Publica.

Biological Effects Produced by Intense Pulsed Light (Xe-Cl) on the Cartilage of the Tongue Chick Embryo Using Various Filters

El laser utilizado correctamente en la practica medica ofrece claras ventajas cuando se compara con las terapias tradicionales. La mejoria e incluso la eliminacion significativa de muchas lesiones cutaneas se pueden lograr con riesgos reducidos para los pacientes. Sin embargo, es importante guardar medidas de seguridad y conocer los posibles efectos en un modelo experimental. El embrion de pollo es un buen modelo para evaluar los efectos directos de radiaciones no ionizantes por su facil manipulacion y disponibilidad. El objetivo del presente trabajo es comunicar los cambios histopatologicos en organos del embrion de pollo con y sin barrera de proteccion al ser sometido a radiacion excimer. Se utilizo el siguiente elemento emisor: luz pulsada intensa (Xe-Cl excimer laser de 308 nm de longitud de onda. Se irradiaron los embriones a traves de una ventana abierta en la cascara del huevo. Los huevos fueron mantenidos asepticamente por 24 hs en una incubadora. Las barreras de proteccion utilizadas fueron vidrio con y sin color, latex, celofan, papel, policarbonato de diferentes colores y espesores. Los resultados mas sobresalientes, sin barrera y con barreras transparentes y de color verde fueron: intensa vasocongestion, edema y focosde necrosis. Se concluye que las modificaciones tisulares observadas son compatibles con posibles efectos fototermicos colaterales de estas radiaciones los que nos advierten sobre posibles efectos adversos cuando las mismas se aplican indiscriminadamente. Creemos que es de importancia estudiar los diferentes medios que permitan resguardar la seguridad de los pacientes y operadores.

Biosafety in the Use of Radiation: Biological Effects Comparison Between Laser Radiation, Intense Pulsed Light and Infrared and Ultraviolet Lamps in an Experimental Model in Chicken Embryos

Physics is the science that studies the interaction between matter and energy. This discipline studies the general properties of bodies, the forces that modify the transfer of energy and the interaction between particles. Physics now has many branches, and one of them is the Biomedical Physics. Biomedical Physics in Medicine applies the principles and methods of physics. This will generate new knowledge and progress towards new horizons in the management of certain diseases. Thus the study of radiation led to progress in the field of diagnosis and therapy of some diseases. Radiation its called all energy that propagates as a wave through space. Radiation can be classified as ionizing radiation (cosmic rays, gamma rays, x-rays) and non-ionizing radiation. The concept of non-ionizing radiation includes ultraviolet (UV), infrared (IR) and others lasers. Non-ionizing radiations are those that radiation interaction with matter does not generate ions due to its energy content is relatively low. Non-ionizing radiation (laser, ultraviolet and infrared) are commonly used in medicine for diagnosis and therapy. However, they have a deleterious effect on organogenesis (organ formation).

CO2 Laser Effects on Dentin Root Canals: Studies with the Scanning Electron Micrograph

ABSTRACT The aim of this work was to study the structural aspects of dentin surface by CO2 laser irradiation. One hundred specimens were lased with 3 W for 1, 3, 5, 10, and 15 sec. The irradiated hemisections were processed for SEM observation. With 3 W power emission during 1 sec the samples revealed a crusty wavy aspect. At the edges of the crusts, the dentine had been melted, and was slightly separated from the wall showing an actual cutting effect. When the irradiation time (IT) was increased to 10 and 15 sec fungi formations were observed. Melted recrystalized dentin rims were visible in certain areas. CO2 laser irradiation induces coagulation, vaporization, and melted tissue with cracks and carbonizations areas.

Helium-neon effects of laser radiation in rats infected with thromboxane B 2

In previous investigations it was found that prostaglanding E1 (PGE1) and Bradiquinine (B), liberated in the inflammatory process, produced a significant increment on the Plasma fibrition Level (PFL), indicative of inflammatory process. The mentioned increment was completely abolished by the irradiation with HeNe laser in the area of infection of the mentioned substances. In the current investigation it was studied the effect of HeNe laser radiation on the P.F.L. of rats injected with another substance related with the inflammatory process and tissular injury: Thromboxane (Tx). It is though that the signal to increase P.F.L. is though an adrenal and an extra adrenal pathways. To study it we injected normal and medullectomized animals and both showed marked increment of P.F.L. Then we repeated the experiment but followed immediately by HeNe laser radiation and we noted a complete blockage of the P.F.L. increment in both groups which suggest that the effect is extra-adrenal. All substances were injected I.M. once daily X 3 days. Immediately after injection the area was irradiated with HeNe laser, 1.5 J total energy. In the normal, non injected non irradiated animals the P.F.L. reached 210.3 + 1.15 mg%. The single injection of Tx did not modify the P.F.L. compared with the previous group. The HeNe irradiation alone did not modify the P.F.L. in the animals injected with Tx only. The animals injected with PGE1+B showed a marked increment of P.F.L. to 337.6 + 14.5 mg%; the HeNe laser radiation completely abolished the increment (231 + 22.3 mg%). But in the animals injected with PGE1+B+Tx, the P.F.L. reached even larger values: 375.2 + 15.3 mg%. The HeNe laser radiation produced a partial blockage in P.F.L. increment (270.3 +/- 13.4 mg%). Showing a significant difference (p < 0.001) compared with normal rats or with rats injected with PGE1+B+Tx without radiation. In conclusion Tx potentiate the effect of PGE+B on the P.F.L. The HeNe laser blocks completely the interaction of PGE1+B on the P.F.L. but only partially the interaction PGE(subscript 1+B+Tx.

Na+-K+ Transport, Cotransport and Cell Volume of Rats Erythrocytes Submitted to Helium-Neon Laser Radiation

It has been studied the Na+-K+ transport, cotransport, and cell volume in erythrocytes of rats irradiated with Helium-Neon laser. It has been observed an increase in the passive diffusion of Na+ and K+ compensated by higher Na+-K+ pump activity. There was not observed alterations in Na+ and K+ cotransport, cell volume, as well as in the Na+ and K+ intracellular content.