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Esterase variation among Argentine populations of Trimerotropis pallidipennis (Orthoptera)
VA Confalonieri, JC Vilardi, BO Saidman
Genetics Selection Evolution , 1990, DOI: 10.1186/1297-9686-22-3-279
Abstract:
Synthesis of a Thienothiophene Conjugated Polymer
Alejandra S. Diez,Silvana Saidman,Raúl O. Garay
Molecules , 2000, DOI: 10.3390/50300555
Abstract: A new conducting polymer was prepared by chemical and electrochemical polymerization of 3,6-dimethylthieno[3,2-b]thiophene. The galvanostatic deposition afforded uniform, adherent and dark blue films of PDMTT. Electrochemical characterization by cyclic voltammetry showed that it can be repeatedly driven between the doped and undoped species with a coulombic efficiency of nearly 100%.
Genetic relationships among American species of Prosopis (Leguminosae) based on enzyme markers
Bessega, Cecilia;Saidman, Beatriz Ofelia;Vilardi, Juan César;
Genetics and Molecular Biology , 2005, DOI: 10.1590/S1415-47572005000200018
Abstract: in the present work, isoenzyme electrophoresis was used to analyze the variability and phenetic relationships among seven american species of genus prosopis belonging to three different sections: p. argentina (monilicarpa), p. glandulosa, p. velutina, p. flexuosa, p. ruscifolia, p. kuntzei (algarobia), and p. reptans (strombocarpa). the genetic variability in p. argentina, p. reptans, and p. kuntzei was significantly lower than in the rest of the species analyzed. the species belonging to different sections are highly differentiated, but the relationships retrieved among species belonging to the section algarobia suggested that the series of this section are not natural groups. p. kuntzei is as differentiated from the remaining species of algarobia as from p. reptans or p. argentina, suggesting that this species might be included in a different section. the series within section algarobia are not supported by the clusters retrieved in the phenogram based on isoenzymatic data. the results suggest that the two north american species (p. velutina and p. glandulosa) would have originated in different founder events.
Isozyme and RAPD studies in Prosopis glandulosa and P. Velutina (Leguminosae, Mimosoideae)
Bessega, Cecilia;Saidman, Beatriz O.;Vilardi, Juan C.;
Genetics and Molecular Biology , 2000, DOI: 10.1590/S1415-47572000000300024
Abstract: allozyme and random amplified polymorphic dna (rapd) techniques have been compared for their usefulness for genetic and taxonomic studies in prosopis glandulosa and p. velutina populations. isozymes and rapds yielded similarly high estimates of genetic variability. genetic structure and differentiation were analyzed through non-hierarchical wright's fdt. for all populations considered, both markers produced low gene flow (nm < 1) estimates. when only p. glandulosa populations were analyzed, isozyme data yielded higher gene flow estimates (nm > 1), in agreement with that expected for conspecific populations. however, in rapd data the expected reduction in fdt and the increase in nm were not observed. correlation between fdt and geographical distance matrices (mantel test) for all populations was significant (p = 0.02) when based on isozymes, but not so (p = 0.33) when based on rapds. no significant associations among genetic and geographical or climatic variables were observed. two isoenzyme systems (got and prx) enabled us to distinguish between p. glandulosa and p. velutina, but no diagnostic band for recognition of populations or species studied here were detected by rapd. however, rapd markers showed higher values for genetic differentiation among conspecific populations of p. glandulosa and a lower coefficient of variation than those obtained from isozymes.
Corrosion mechanism of Al-Zn-In alloys in chloride solutions
Mu?oz,A. G.; Saidman,S. B.; Bessone,J. B.;
Latin American applied research , 2003,
Abstract: the electrochemical behavior of al-zn-in alloys was investigated in chloride media by means of potentiodynamic techniques, complemented by scanning electron microscopy (sem), energy dispersive x-ray analysis (edx) and transmission electron microscopy (tem). the influence of local alkalization produced by previous cathodization was analyzed at potentials more negative than the rest potential. the electrochemical response of alloys is given by the sum of those corresponding to the different present phases. thus, the electrochemical behavior of each metal and bimetallic alloy (al-in, in-al and zn-in) was analyzed in the same solution conditions at a potential region near the corrosion potential of the ternary alloy. the low solubility of in in al favors its segregation at grain boundaries, where the formation of zn-in alloys was detected. the initiation of the attack in the al-zn-in alloy is mainly localized in these zones. this is a consequence of the enhanced adsorption and surface accumulation of cl- promoted by in at potentials more positive than - 1.1 vsce. close similarities of the anodic behaviors of the al-in and ternary alloys lead us to propose a mechanism where the in distribution plays the major role. the in dissolution from homogeneous solid solution phases allows an enrichment of this element at the al and zn rich phases by displacement reactions. (al,zn)in + cl- ? incl2+ + 3 e- 2 incl2+ + 3 zn ? 2 in0 + 3 zn2+ + 2 cl- this, in turn, assures an accumulation of adsorbed cl-, which maintains an active state of the al matrix. thus, the rapid zn dissolution reaction ensures a better redistribution of in, so bringing the system towards potentials near those for cl- adsorption on in. the attack morphology was also analyzed in order to explain the smooth wide cavities embracing many grains.
Isozyme and RAPD studies in Prosopis glandulosa and P. Velutina (Leguminosae, Mimosoideae)
Bessega Cecilia,Saidman Beatriz O.,Vilardi Juan C.
Genetics and Molecular Biology , 2000,
Abstract: Allozyme and random amplified polymorphic DNA (RAPD) techniques have been compared for their usefulness for genetic and taxonomic studies in Prosopis glandulosa and P. velutina populations. Isozymes and RAPDs yielded similarly high estimates of genetic variability. Genetic structure and differentiation were analyzed through non-hierarchical Wright's F DT. For all populations considered, both markers produced low gene flow (Nm < 1) estimates. When only P. glandulosa populations were analyzed, isozyme data yielded higher gene flow estimates (Nm > 1), in agreement with that expected for conspecific populations. However, in RAPD data the expected reduction in F DT and the increase in Nm were not observed. Correlation between F DT and geographical distance matrices (Mantel test) for all populations was significant (P = 0.02) when based on isozymes, but not so (P = 0.33) when based on RAPDs. No significant associations among genetic and geographical or climatic variables were observed. Two isoenzyme systems (GOT and PRX) enabled us to distinguish between P. glandulosa and P. velutina, but no diagnostic band for recognition of populations or species studied here were detected by RAPD. However, RAPD markers showed higher values for genetic differentiation among conspecific populations of P. glandulosa and a lower coefficient of variation than those obtained from isozymes.
Corrosion mechanism of Al-Zn-In alloys in chloride solutions
A. G. Mu?oz,S. B. Saidman,J. B. Bessone
Latin American applied research , 2003,
Abstract: The electrochemical behavior of Al-Zn-In alloys was investigated in chloride media by means of potentiodynamic techniques, complemented by Scanning Electron Microscopy (SEM), Energy Dispersive X-Ray Analysis (EDX) and Transmission Electron Microscopy (TEM). The influence of local alkalization produced by previous cathodization was analyzed at potentials more negative than the rest potential. The electrochemical response of alloys is given by the sum of those corresponding to the different present phases. Thus, the electrochemical behavior of each metal and bimetallic alloy (Al-In, In-Al and Zn-In) was analyzed in the same solution conditions at a potential region near the corrosion potential of the ternary alloy. The low solubility of In in Al favors its segregation at grain boundaries, where the formation of Zn-In alloys was detected. The initiation of the attack in the Al-Zn-In alloy is mainly localized in these zones. This is a consequence of the enhanced adsorption and surface accumulation of Cl- promoted by In at potentials more positive than - 1.1 V SCE. Close similarities of the anodic behaviors of the Al-In and ternary alloys lead us to propose a mechanism where the In distribution plays the major role. The In dissolution from homogeneous solid solution phases allows an enrichment of this element at the Al and Zn rich phases by displacement reactions. (Al,Zn)In + Cl- InCl2+ + 3 e- 2 InCl2+ + 3 Zn 2 In0 + 3 Zn2+ + 2 Cl- This, in turn, assures an accumulation of adsorbed Cl-, which maintains an active state of the Al matrix. Thus, the rapid Zn dissolution reaction ensures a better redistribution of In, so bringing the system towards potentials near those for Cl- adsorption on In. The attack morphology was also analyzed in order to explain the smooth wide cavities embracing many grains.
Conocimientos, intereses y creencias sobre alimentación y nutrición en gestantes Knowledge, interests and beliefs on food and nutrition in pregnant women
Natalia Saidman,María Gabriela Raele,Mariana Basile,Luciana Barreto
Diaeta , 2012,
Abstract: El consumo inadecuado de nutrientes por parte de las mujeres embarazadas afecta su estado nutricional y conlleva a mayores riesgos de enfermedades por carencias o excesos. Por ello se considera fundamental conocer las creencias, dudas, mitos e intereses que ellas posean durante el momento biológico, para poder transmitirles conocimientos oportunos teniendo en cuenta sus reales necesidades. Objetivo: Explorar en un grupo de gestantes cambios alimentarios, conocimientos sobre alimentación y nutrición, mitos, tabúes y creencias. Conocer e interpretar las dudas e intereses acerca de la alimentación y el embarazo, con el fin de lograr un punto de partida para el dise o de un programa de interven ción nutricional aplicado al control prenatal. Materiales y métodos: Se realizó un cuestionario semiestructurado a 117 gestantes sanas mayores de 17 a os de edad que concurrieron al control de su embarazo a los servicios de obstetricia y ginecología a distintos hospitales y centros de salud de la ciudad de Buenos Aires durante los meses de febrero a agosto del 2011. La información obtenida de los cuestionarios se completó con entrevistas en profundidad realizadas a 6 gestantes con el objetivo de explorar teorías subjetivas. Resultados: El 31% de las embarazadas atribuyó connotaciones negativas a algún alimento, por asociarlos con posibles da os hacia el bebé o con una ganancia de peso mayor a la deseada, entre ellos apareció llamativamente la carne. El 65% refirió realizar cambios en la selección de alimentos a partir del embarazo, y aumentar la ingesta de frutas, verduras, cereales y leche; el principal grupo disminuido fue el de las carnes. Se evidencia desconocimiento sobre la ganancia de peso y sobre la anemia y diversos inconvenientes con respecto a la suplementación de hierro. El 92% de las embarazadas manifestaron tener interés en recibir mayor información nutricional durante el control. Conclusión: Se visualiza la importancia de dise ar un programa de intervención nutricional focalizado en ofrecer un acompa amiento especializado en nutrición durante el control prenatal. Los ejes centrales de dicha intervención serán el componente educativo y la consejería nutricional priorizando los conocimientos, intereses y creencias identificadas en este grupo. Inadequate intake of nutrients by pregnant women affects their nutritional status and lead to greater risk of deficiency or excess diseases. It is therefore considered essential to know which beliefs, doubts, myths and interests women have during pregnancy to transmit knowledge taking into account their real needs. O
Can modern infrared analyzers replace gas chromatography to measure anesthetic vapor concentrations?
Jan FA Hendrickx, Hendrikus JM Lemmens, Rik Carette, Andre M De Wolf, Lawrence J Saidman
BMC Anesthesiology , 2008, DOI: 10.1186/1471-2253-8-2
Abstract: To examine linearity, we analyzed 3 different concentrations of 3 different agents in O2: 0.3, 0.7, and 1.2% isoflurane; 0.5, 1, and 2% sevoflurane; and 1, 3, and 6% desflurane. To examine the effect of carrier gas composition, we prepared mixtures of 1% isoflurane, 1 or 2% sevoflurane, or 6% desflurane in 100% O2 (= O2 group); 30%O2+ 70%N2O (= N2O group), 28%O2 + 66%N2O + 5%CO2 (= CO2 group), or air. To examine consistency between analyzers, four different M-CAiOV analyzers were tested.The IR analyzer response in O2 is linear over the concentration range studied: IR isoflurane % = -0.0256 + (1.006 * GC %), R = 0.998; IR sevoflurane % = -0.008 + (0.946 * GC %), R = 0.993; and IR desflurane % = 0.256 + (0.919 * GC %), R = 0.998. The deviation from GC calculated as (100*(IR-GC)/GC), in %) ranged from -11 to 11% for the medium and higher concentrations, and from -20 to +20% for the lowest concentrations. No carrier gas effect could be detected. Individual modules differed in their accuracy (p = 0.004), with differences between analyzers mounting up to 12% of the medium and highest concentrations and up to 25% of the lowest agent concentrations.M-CAiOV compact gas IR analyzers are well compensated for carrier gas cross-sensitivity and are linear over the range of concentrations studied. IR and GC cannot be used interchangeably, because the deviations between GC and IR mount up to ± 20%, and because individual analyzers differ unpredictably in their performance.Gas chromatography (GC) has often been considered the most accurate method to measure the concentration of potent inhaled anesthetics (further referred to as "anesthetic vapors"). Infrared (IR) gas analysis provides continuous data and is more readily available clinically, less expensive and more practical, but needs complex calibration and compensation procedures to minimize or eliminate the effects of overlapping IR absorption spectra of anesthetic vapors, H2O, N2O, and CO2 and those of "collision broadening" or
Conocimientos, intereses y creencias sobre alimentación y nutrición en gestantes
Saidman,Natalia; Raele,María Gabriela; Basile,Mariana; Barreto,Luciana; Mackinonn,María José; Poy,Mabel Susana; Terraza,Raul; López,Laura Beatriz;
Diaeta , 2012,
Abstract: inadequate intake of nutrients by pregnant women affects their nutritional status and lead to greater risk of deficiency or excess diseases. it is therefore considered essential to know which beliefs, doubts, myths and interests women have during pregnancy to transmit knowledge taking into account their real needs. objective: to explore dietary changes, food and nutrition knowledge, myths, taboos and beliefs in a group of pregnant women. to understand and interpret doubts and interests about diet and pregnancy, in order to achieve a starting point to design an intervention program for prenatal nutrition control. materials and methods: a semistructured questionnaire was conducted amongst 117 healthy pregnant women over 17 years of age who went in for their pregnancy check ups to obstetric and gynecological services in buenos aires city hospitals and health centers from february to august 2011. the information collected was completed with in-depth interviews to 6 pregnant women with the goal of exploring subjective theories. results: negative connotations to some food were charged by 31% of pregnant women, by associating them with possible damage to the baby or a weight gain greater than desired; surprisingly meat appeared within these foods. changes in food choices from pregnancy were reported by 65%, including increased intake of fruits, vegetables, cereals and milk and decreased meat intake. lack of knowledge was evidenced on weight gain, anemia and iron supplementation. most pregnant women (92%) expressed interest in receiving more nutritional information in the check up. conclusions: the present study highlights the importance of designing a nutritional intervention program focused on providing nutrition support during prenatal care. the focus of this intervention should be the educational component and nutritional counseling prioritizing knowledge, interests and beliefs identified in this group.
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