Control No Lineal Del Dosificador De Una Sembradora De Precisión (2008)
D. F. Riccia; Departamento De Electrónica, Facultad De Ciencias Exactas, Ingeniería Y Agrimensura, Universidad Nacional De Rosario, M. A. Medina; Consejo De Investigaciones, Facultad De Ciencias Exactas, Ingeniería Y Agrimensura, Universidad Nacional De Rosario
En este trabajo se muestra un ejemplo concreto de un innovador control no lineal aplicado a un sistema electro-hidráulico de velocidad del dosificador de una sembradora de grano grueso de precisión...
M. C. Olguín; Depto. De Matemática, FCE, Univ. Austral, Paraguay 1950, M. A. Medina; †Consejo De Investigaciones, Univ. Nac. De Rosario, M. C. Sanziel; Consejo De Investigaciones, Univ. Nac. De Rosario, D. A. Tarzia; Depto. De Matemática - CONICET, FCE, Univ. Austral.
Las sustancias con adecuada temperatura de cambio de fase (PCM, phase change materials) son usadas para moderar las oscilaciones de temperatura y almacenar energía. En el caso del transporte de...
NEW CONCEPTS FOR SOLID STATE MICROWAVE GENERATORS. (2005)
The basic theory of transit-time delay diodes is developed, and their maximum power output calculated. This output is about 7% of that calculated for conventional transistors on a similar basis, but...
Zhang, M., Medina, M. A., King, J. B.
The main purpose of this work was to develop a thermally enhanced frame wall that would reduce peak load air conditioning demand, shift a portion of the thermal load, and conserve energy in...
Zhang, M., Medina, M. A., King, J. B.
The main purpose of this work was to develop a thermally enhanced frame wall that would reduce peak load air conditioning demand, shift a portion of the thermal load, and conserve energy in...
On the interpretation of Raman spectra of 1-aminooxy-spermine/DNA complexes (2004)
Ruiz-Chica, A. J., Medina, M. A., Sánchez-Jiménez, F., Ramírez, F. J.
By FT–Raman spectroscopy, we have investigated the effect of 1‐aminooxy‐spermine (AOSPM) on aggregation and stability of calf‐thymus DNA and selected oligonucleotide chains. AOSPM is...
Rodriguez-Caso, C., Rodriguez-Agudo, D., Moya-Garcia, A. A., Fajardo, I., Medina, M. A., Subramaniam, V., ...
Mature, active mammalian histidine decarboxylase is a dimeric enzyme of carboxy-truncated monomers ( ~53 kDa). By using a biocomputational approach, we have generated a three-dimensional model of a...
The recent development of single molecule detection techniques has opened new horizons for the study of individual macromolecules under physiological conditions. Conformational subpopulations,...
Flowing partially penetrating well: a solution of a mixed-type boundary value problem. (1999)
Cassiani, G., Kabala, Z. J., Medina, M. A.
A new semi-analytic solution to the mixed-type boundary value problem for a flowing partially penetrating well with infinitesimal skin situated in an anisotropic aquifer is developed. The solution is...
The purpose of these experiments was to determine the effect of an organophosphorus cholinesterase inhibitor, paraoxon, on glucose utilization and the levels of intermediary metabolites in brain. The...
Figueroa, I. E., Cathey, M., Medina, M. A., Nutter, D. W.
This paper presents modifications made to the procedure used to develop a universal thermodynamic model of chillers (Gordon and Ng, 1995). The modifications were necessary to capture physical...
Economic Evaluation of Insulation/Radiant Barrier Systems for the State of Texas (1994)
Medina, M. A., Turner, W. D., O'Neal, D. L.
This paper presents simulated performance of insulation/radiant barrier systems under different Texas climates. A transient heat and mass transfer model which predicts thermal performance of...
Effect of Radiant Barrier Technology on Summer Attic Heat Load in South Texas (1994)
Ashley, R., Garcia, O., Medina, M. A., Turner, W. D.
The objective of the study was to experimentally evaluate the performance of radiant barriers in single-family occupied housing units in South Texas. Ceiling heat fluxes, attic air temperatures,...
Fast solution of the obstacle problem (1990)
Medina, M.A., Gonzalez, Roberto L.
The purpose of this paper is to present a fast algorithm for the numerical solution of the one-dimensional obstacle problem. It is proven that it converges in a finite number of steps and application...
Fast solution of the obstacle problem (1990)
Medina, M.A., Gonzalez, Roberto L.
The purpose of this paper is to present a fast algorithm for the numerical solution of the one-dimensional obstacle problem. It is proven that it converges in a finite number of steps and application...
Fast solution of the obstacle problem (1990)
Medina, M.A., Gonzalez, Roberto L.
The purpose of this paper is to present a fast algorithm for the numerical solution of the one-dimensional obstacle problem. It is proven that it converges in a finite number of steps and application...
On the interpretation of Raman spectra of 1-aminooxy-spermine/DNA complexes
Ruiz-Chica, A. J., Medina, M. A., Sánchez-Jiménez, F., Ramírez, F. J.
By FT–Raman spectroscopy, we have investigated the effect of 1-aminooxy-spermine (AOSPM) on aggregation and stability of calf-thymus DNA and selected oligonucleotide chains. AOSPM is able to mimic...
Diamines interfere with the transport of L-ornithine in Ehrlich-cell plasma-membrane vesicles.
Medina, M A, Urdiales, J L, Mates, J M, Sánchez-Jiménez, F
1. L-Ornithine transport by plasma-membrane vesicles isolated from Ehrlich cells is Na(+)-independent and shows a saturable and a diffusional component. 2. Putrescine, histamine, 5-hydroxytryptamine...
Quesada, A R, Sanchez-Jimenez, F, Perez-Rodriguez, J, Marquez, J, Medina, M A
Phosphate-dependent glutaminase was purified to homogeneity from isolated mitochondria of Ehrlich ascites-tumour cells. The enzyme had an Mr of 135,000 as judged by chromatography on Sephacryl S-300....
Glutamine transport by vesicles isolated from tumour-cell mitochondrial inner membrane.
Molina, M, Segura, J A, Aledo, J C, Medina, M A, Márquez, J
Mitochondrial-inner-membrane vesicles, isolated from Ehrlich ascites carcinoma cells by titration with detergents, accumulated L-glutamine by a very efficient transport system. The vesicles lack any...
A ferricyanide-utilizing NADH dehydrogenase (NADH-ferricyanide oxidoreductase) from the plasma membrane of Ehrlich ascites tumour cells has been purified about 1500-fold to apparent homogeneity. The...
Engel, N, Olmo, M T, Coleman, C S, Medina, M A, Pegg, A E, Sánchez-Jiménez, F
Common protein motifs between histidine decarboxylase (HDC) and ornithine decarboxylase (ODC) were detected by computational analysis. Mutants were generated and expressed in vitro. In both enzymes,...
Ruiz-Chica, J, Medina, M A, Sánchez-Jiménez, F, Ramírez, F J
Biogenic polyamines putrescine, spermidine, and spermine are essential molecules for proliferation in all living organisms. Direct interaction of polyamines with nucleic acids has been proposed in...
Jacobs, T L, Warmerdam, J M, Medina, M A, Piver, W T
Pollutants in groundwater aquifers may constitute a significant human health risk. A large variation in response may result among human populations experiencing the same level and duration of...
Evaluation of health risks for contaminated aquifers.
Piver, W T, Jacobs, T L, Medina, M A
This review focuses on progress in the development of transport models for heterogeneous contaminated aquifers, the use of predicted contaminant concentrations in groundwater for risk assessment for...
On the interpretation of Raman spectra of 1-aminooxy-spermine/DNA complexes
Ruiz-Chica, A. J., Medina, M. A., Sánchez-Jiménez, F., Ramírez, F. J.
By FT–Raman spectroscopy, we have investigated the effect of 1-aminooxy-spermine (AOSPM) on aggregation and stability of calf-thymus DNA and selected oligonucleotide chains. AOSPM is able to mimic...
Diamines interfere with the transport of L-ornithine in Ehrlich-cell plasma-membrane vesicles.
Medina, M A, Urdiales, J L, Mates, J M, Sánchez-Jiménez, F
1. L-Ornithine transport by plasma-membrane vesicles isolated from Ehrlich cells is Na(+)-independent and shows a saturable and a diffusional component. 2. Putrescine, histamine, 5-hydroxytryptamine...
Quesada, A R, Sanchez-Jimenez, F, Perez-Rodriguez, J, Marquez, J, Medina, M A
Phosphate-dependent glutaminase was purified to homogeneity from isolated mitochondria of Ehrlich ascites-tumour cells. The enzyme had an Mr of 135,000 as judged by chromatography on Sephacryl S-300....
Glutamine transport by vesicles isolated from tumour-cell mitochondrial inner membrane.
Molina, M, Segura, J A, Aledo, J C, Medina, M A, Márquez, J
Mitochondrial-inner-membrane vesicles, isolated from Ehrlich ascites carcinoma cells by titration with detergents, accumulated L-glutamine by a very efficient transport system. The vesicles lack any...
A ferricyanide-utilizing NADH dehydrogenase (NADH-ferricyanide oxidoreductase) from the plasma membrane of Ehrlich ascites tumour cells has been purified about 1500-fold to apparent homogeneity. The...
Engel, N, Olmo, M T, Coleman, C S, Medina, M A, Pegg, A E, Sánchez-Jiménez, F
Common protein motifs between histidine decarboxylase (HDC) and ornithine decarboxylase (ODC) were detected by computational analysis. Mutants were generated and expressed in vitro. In both enzymes,...
Ruiz-Chica, J, Medina, M A, Sánchez-Jiménez, F, Ramírez, F J
Biogenic polyamines putrescine, spermidine, and spermine are essential molecules for proliferation in all living organisms. Direct interaction of polyamines with nucleic acids has been proposed in...
Jacobs, T L, Warmerdam, J M, Medina, M A, Piver, W T
Pollutants in groundwater aquifers may constitute a significant human health risk. A large variation in response may result among human populations experiencing the same level and duration of...
Evaluation of health risks for contaminated aquifers.
Piver, W T, Jacobs, T L, Medina, M A
This review focuses on progress in the development of transport models for heterogeneous contaminated aquifers, the use of predicted contaminant concentrations in groundwater for risk assessment for...