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1. Geología de los alrededores de los ríos caleufú y meliquina, provincia de Neuquén: El volcanismo de la Formación Huitrera

Author

Palotti, Priscila F., Jait, Damian M., Orts, Darío Leandro, Litvak, Vanesa D., and Ramos, Victor A.

Subjects
Patagonian Andes, Petrography, Rocas Volcánicas, Lavic Facies, Ciencias de la Tierra y relacionadas con el Medio Ambiente, purl.org/becyt/ford/1 [https], Andes Patagónicos, purl.org/becyt/ford/1.5 [https], Vulcanología, Pyroclastic Facies, Facies Lávicas, Volcanic Rocks, CIENCIAS NATURALES Y EXACTAS, Facies Piroclásticas
Abstract

Fil: Palotti, Priscila F. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales. Departamento de Ciencias Geológicas; Argentina. Fil: Palotti, Priscila F. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Ciudad Universitaria; Argentina Fil: Palotti, Priscila F. Instituto de Estudios Andinos; Argentina Fil: Jait, Damian M. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales. Departamento de Ciencias Geológicas; Argentina. Fil: Jait, Damian M. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Ciudad Universitaria; Argentina Fil: Jait, Damian M. Instituto de Estudios Andinos; Argentina Fil: Orts, Darío L. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales. Departamento de Ciencias Geológicas; Argentina Fil: Orts, Darío L. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Ciudad Universitaria; Argentina Fil: Orts, Darío L. Instituto de Estudios Andinos; Argentina. Fil: Litvak, Vanesa D. Universidad de Buenos Aires. Facultad de Cs.exactas y Naturales. Departamento de Geologia; Argentina. Fil: Litvak, Vanesa D. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Ciudad Universitaria; Argentina Fil: Litvak, Vanesa D. Instituto de Estudios Andinos; Argentina Fil: Ramos, Victor A. Instituto de Estudios Andinos "Don Pablo Groeber"; Argentina Fil: Ramos, Victor A. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Ciudad Universitaria; Argentina Fil: Ramos, Victor A. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina A series of paleogene volcanic rocks exposed south of Villa Meliquina, located in the foothills of the Andes in the Neuquén province, has been studied in this work. It corresponds to a poorly known area from the geological point of view, located between the San Martin de los Andes and San Carlos de Bariloche localities, where outcrop a volcanic sequence assigned to the Huitrera Formation. In the surveyed area, two different structural domains affecting these outcrops were described: a western sector, in the Lago Filo Hua Hum region, where NE oriented folds and faults predominate, and an eastern sector, around the Caleufú river, dominated by NW trending and NE verging thrusts associated to anticlines. Two profiles of the Huitrera Formation were surveyed in both areas, as well as other outcrops of the volcanic rocks in the region. As a result, it was recognized that the Huitrera Formation is formed by a pyroclastic and lavic facies: the first is more dominant in the western region, while the second is fully developed in the eastern region. The lava facies is composed of lava flows of basaltic and rhyolitic composition, with porphyritic texture and frequent disequilibrium textures; in the pyroclastic facies, the vitreous tuffs are predominant with different degrees of welding. The petrographic characteristics of both facies can be correlated with the bimodal volcanism associated to lavic-pyroclastic facies previously defined for equivalent sequences in reighbouring regions. The particular distribution of the facies in the work area would mainly be controlled by the structure En este trabajo se ha relevado la región localizada al sur de la Villa Meliquina, en la provincia del Neuquén, zona poco estudiada desde el punto de vista geológico. Esta se sitúa entre las localidades de San Martín de los Andes y San Carlos de Bariloche, donde afloran volcanitas aquí asignadas a la Formación Huitrera. En este sector se diferencian dos dominios con distintas características estructurales: un sector occidental, en la región del lago Filo Hua Hum, donde predominan plegamientos y fallas de orientación NE; y un sector oriental, donde se ubica el río Caleufú, dominado por anticlinales asociados a corrimientos de orientación NO y vergencia NE. Se relevaron dos perfiles de la Formación Huitrera en estas dos áreas como así también otros afloramientos de las volcanitas en la región. Como resultado, se reconoció que la Formación Huitrera está conformada en el área por una facies piroclástica y otra lávica: la primera es más dominante en la región occidental de la zona de estudio, mientras que la segunda, está más ampliamente desarrollada en la región oriental. La facies lávica está compuesta por flujos lávicos de composición basáltica y riolítica, con texturas porfíricas y frecuentes texturas de desequilibrio, mientras que en la facies piroclástica, predominan las tobas vítreas, con diferentes grados de soldadura. Las características petrográficas de ambas facies se correlacionan con las facies lavico / piroclástica asociadas a un vulcanismo bimodal, como fueran caracterizadas previamente ciertas secuencias equivalentes en forma regional. Por su parte, la particular distribución de las facies en la zona de trabajo tendría una causa principalmente estructural.

Published
2013

2. [Evaluation of immune response in experimental sporotrichosis using T and B lymphocyte count].

Author

Ramos Zepeda R, Ramos Zepeda R, Ramos Damian ME, González Rico BM, and González Mendoza A

Subjects
Animals, Antibody Formation, Gerbillinae, Immunity, Cellular, Male, Rosette Formation, Leukocyte Count, Lymphocytes immunology, Sporotrichosis immunology
Abstract

The effector cells of the immune response are involved in the clinical course of bacterial, viral and mycotic infections. Previous publications have reported that some mycotic infections, including sporotrichosis, can produce a negative modulation of the immune response unfavorable for the host. In this work T and B lymphocytes capable to form direct and indirect rosettes respectively with sheep erythrocytes in gerbils with experimental sporotrichosis, were measured. It was found a significant rise in the number to T and B lymphocytes which means normal immunological reactivity. These results are not in accordance with the idea that sporotrichosis can depress the immune response of the host.

Published
1990

3. [Leukocyte phagocytic activity in gerbils with experimental sporotrichosis treated with potassium iodide].

Author

Ramos Zepeda R, Ramos Zepeda R, Ramos Damian ME, González Rico BM, and González Mendoza A

Subjects
Animals, Gerbillinae, Macrophages metabolism, Male, Neutrophils metabolism, Oxidation-Reduction, Macrophages drug effects, Neutrophils drug effects, Phagocytosis drug effects, Potassium Iodide therapeutic use, Sporotrichosis drug therapy
Abstract

One effective treatment against sporotrichosis is the oral administration of potassium iodide (KI). It is not known how it works, and also it is not known if this substance has some effect on the microbicidal activity of polymorphonuclear neutrophils (PMN) and macrophages. In this work the phagocytic activity of gerbils treated with KI was studied. Gerbils cured within 62 days of treatment with KI, their PMN and macrophages showed an increased ability for reducing nitroblue-tetrazolium (NBT); myeloperoxidase activity was decreased in PMN. These results were the expected in any chronic infection and demonstrates that KI effectiveness on the experimental sporotrichosis works by an independent mechanism of phagocytosis.

Published
1990

4. [Postnatal phagocytic maturation (author's transl)].

Author

Gómez-Estrada H, Gómez Guitrón G, Ramos-Damian ME, and Orozco Mejia S

Subjects
Aging, Body Weight, Child, Preschool, Female, Humans, Infant, Infant, Newborn, Male, Infant, Premature, Neutrophils immunology, Phagocytosis
Abstract

Seventy two children were studied including 12 prematures, 31 newborns, 25 infants and 4 preschool children. They were clinically healthy with exception of prematurity factor. The phagocytic index (PI) of their polymorphonuclear leukocytes was investigated against latex particles suspended in autologous serum. In prematures PI levels were from 5.55 to 11.05; in newborns and infants, 11.09 to 15.00; in preschool children, 15.08 to 21.97 and in normal adults 19.21 to 22.70. PI value showed marked increase after the first neonatal month or when children reached a body weight of over 4.250 Kg.

Published
1979

5. Radiosensitivity of L5178Y murine lymphoma cells.

Author

Gómez-Estrada H, Acosta-Ruíz R, Ramos-Damian ME, Alpuche-Villanueva J, González-Marmolejo R, and Rayón-Rios F

Subjects
Animals, Cell Survival radiation effects, Cobalt Radioisotopes therapeutic use, Mice, Mice, Inbred BALB C, Neoplasm Transplantation, Radiotherapy Dosage, Leukemia L5178 radiotherapy, Leukemia, Experimental radiotherapy
Abstract

Radiosensitivity of L5178/ murine lymphoma was studied in vivo by means of Co60 pump radiations. The dosage necessary to inactivate these cells was from 5,000 to 6,000 rads applied in an only dose. Doses under 2,000 to 4,000 rads only achieved partial inactivation, proportional to dosage applied. 100 to 1600 rad doses did not produce adverse effects on these cells. Lethal dose for carrier mice was from 800 to 1200 rads applied in one dose only or a total of over 600 rads applied in 100 rad daily sessions. High radioresistance of lymphoma did not allow destruction of all neoplastic cells in vivo for, before this occurred carrier mice died.

Published
1979

6. The presence of anti-leukoblast antibodies as complement fixation agents in leukemia patients imm-nized with leukoblats treated with neuraminidase and radiation.

Author

Gómez-Estrada H, Antillón-Conchola AT, Ramos-Damian ME, Isassi-Chapa A, Arechavala-Perichard E, and Delgado-Llamas JL

Subjects
Adolescent, Adult, Antibiotics, Antineoplastic analysis, Complement C3 analysis, Female, Humans, Immunization, Immunotherapy, Leukemia, Myeloid, Acute radiotherapy, Leukemia, Myeloid, Acute therapy, Male, Neuraminidase therapeutic use, Leukemia, Myeloid, Acute immunology
Abstract

Six adult patients with acute myeloblastic leukemia were treated with chemotherapy and immunotherapy. This was done with cultured autologous leukoblasts, treated with neuraminidase of Vibrio cholerae and radiation, and injected six to ten times each eight to ten days between the chemotherapy cycles. Class IgC leukemic anti-leukoblast antibodies which are able to activate the C3 component of the complement system were found in the serum of patients. Five patients have been in complete remission for more than twenty months and the sixth patient for ten months. Antibodies for C3 fixation were not found in the serum of five other patients who were not immunized, nor in five healthy control subjects.

Published
1980

7. Phagocytic activity of rabbit pulmonary macrophages at different temperatures.

Author

Gomez-Estrada H, Ramos-Damian ME, and Cerda-Ocaña G

Subjects
Animals, Latex, Latex Fixation Tests, Lung cytology, Male, Microspheres, Rabbits, Temperature, Lung physiology, Macrophages physiology, Phagocytosis
Abstract

Phagocytic activity of pulmonary macrophages (PM) in contact with latex particles was studied in a group of twelve adult male rabbits, by means of in vitro phagocytosis tests at 35, 37, 39 and 41 degrees C. The phagocytic index at 35 degrees C was 14.70 (sigma = 4.5); at 37 degrees C, 19.61 (sigma = 4.7); at 39 degrees C, 22.45 (sigma = 5.1), and at 41 degrees C, 25.02 (sigma = 5.4). The value of the correlation coefficient between phagocytic index and temperature was r = 0.6022. The previous results allowed to conclude that there is lineal and direct relationship increase between phagocytic indexes and temperature.

Published
1979

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