Lothar Wigger / Claudia Equit (Hrsg.): Bildung, Biografie und Anerkennung, Interpretation eines Interviews mit einem gewaltbereiten Mädchen. Opladen: Budrich 2010 [Rezension]

Rezension von: Lothar Wigger / Claudia Equit (Hrsg.): Bildung, Biografie und Anerkennung, Interpretation eines Interviews mit einem gewaltbereiten Mädchen, Opladen: Budrich 2010 (124 S.; ISBN 978-3-8664-9329-2)

Palabras de la Senadora Claudia Blum en la ceremonia de graduación en el Icesi

Palabras de agradecimiento de la Senadora Claudia Blum, en el cual agradece la gentil invitación del ICESI a participar en esta ceremonia y compartir el logro a culminar de los estudios universitarios, también dice que se siente honrada de asistir a la "Última lección" que brinda el señor rector y tener la oportunidad de presentarles una inquietud que considera fundamental y que ojalá esta reflexión les ayude a cambiar de actitud en favor de nuestra patria.

Ewald Mittelstädt / Claudia Wiepcke: Verhaltensökonomische Experimente. Wirtschaftliche Entscheidungssituationen im Unterrichtsexperiment. Stuttgart: Deutscher Sparkassenverlag 2012 [Rezension]

Rezension von: Ewald Mittelstädt / Claudia Wiepcke: Verhaltensökonomische Experimente. Wirtschaftliche Entscheidungssituationen im Unterrichtsexperiment. Stuttgart: Deutscher Sparkassenverlag 2012

Rezension von: Marita Kampshoff / Claudia Wiepcke (Hrsg.): Handbuch Geschlechterforschung und Fachdidaktik. Wiesbaden: Springer VS 2012 (512 S.) [Rezension]

Rezension von: Marita Kampshoff / Claudia Wiepcke (Hrsg.): Handbuch Geschlechterforschung und Fachdidaktik. Wiesbaden: Springer vs 2012 (512 S.; ISBN 978-3-531-18984-0)

Katharina Mangold / Claudia Muche / Sabrina Volk: Educational Mix in der frühen Kindheit. Regionale Dienstleistungsinfrastrukturen im Vergleich. Weinheim und Basel: Beltz Juventa 2013 (212 S.) [Rezension]

Rezension von: Katharina Mangold / Claudia Muche / Sabrina Volk: Educational Mix in der frühen Kindheit. Regionale Dienstleistungsinfrastrukturen im Vergleich. Weinheim und Basel: Beltz Juventa 2013 (212 S.; ISBN 978-3-7799-2819-5)

Poemas de Claudia Sánchez

- Quieres consentirte- Con que agonía pides...- Lindo, es mentir o más fácil que decir no

"Claudia Quirós Vargas, su aporte a la Historia Colonial de Costa Rica y Centroamérica"

Semblanza

Comentario del libro: “La era de la encomienda, de Claudia Quirós”

IntroducciónHa sido editado recientemente el libro de Claudia Quirós, La Era de la Encomienda. La autora fija su atención en el siglo diecisiete, un siglo poco conocido del pasado de Costa Rica. De la lectura de sus páginas surge una sociedad muy diferente de la supuesta "arcadia campesina" que una mitología se ha encargado de divulgar. Lejos del igualitarismo rural, Quirós nos muestra -apoyándose en documentación fidedigna- como en nuestro país, al término del violento periodo de la Conquista, se conformó una sociedad desigual, terriblemente injusta. Sociedad muy semejante a loas que surgieron en los territorios americanos que habían caído en manos de españoles...

Remediation Of 17-α-ethinylestradiol Aqueous Solution By Photocatalysis And Electrochemically-assisted Photocatalysis Using Tio2 And Tio2/wo3 Electrodes Irradiated By A Solar Simulator.

TiO2 and TiO2/WO3 electrodes, irradiated by a solar simulator in configurations for heterogeneous photocatalysis (HP) and electrochemically-assisted HP (EHP), were used to remediate aqueous solutions containing 10 mg L(-1) (34 μmol L(-1)) of 17-α-ethinylestradiol (EE2), active component of most oral contraceptives. The photocatalysts consisted of 4.5 μm thick porous films of TiO2 and TiO2/WO3 (molar ratio W/Ti of 12%) deposited on transparent electrodes from aqueous suspensions of TiO2 particles and WO3 precursors, followed by thermal treatment at 450 (°)C. First, an energy diagram was organized with photoelectrochemical and UV-Vis absorption spectroscopy data and revealed that EE2 could be directly oxidized by the photogenerated holes at the semiconductor surfaces, considering the relative HOMO level for EE2 and the semiconductor valence band edges. Also, for the irradiated hybrid photocatalyst, electrons in TiO2 should be transferred to WO3 conduction band, while holes move toward TiO2 valence band, improving charge separation. The remediated EE2 solutions were analyzed by fluorescence, HPLC and total organic carbon measurements. As expected from the energy diagram, both photocatalysts promoted the EE2 oxidation in HP configuration; after 4 h, the EE2 concentration decayed to 6.2 mg L(-1) (35% of EE2 removal) with irradiated TiO2 while TiO2/WO3 electrode resulted in 45% EE2 removal. A higher performance was achieved in EHP systems, when a Pt wire was introduced as a counter-electrode and the photoelectrodes were biased at +0.7 V; then, the EE2 removal corresponded to 48 and 54% for the TiO2 and TiO2/WO3, respectively. The hybrid TiO2/WO3, when compared to TiO2 electrode, exhibited enhanced sunlight harvesting and improved separation of photogenerated charge carriers, resulting in higher performance for removing this contaminant of emerging concern from aqueous solution.

Oligomerization, Membrane Association, And In Vivo Phosphorylation Of Sugarcane Udp-glucose Pyrophosphorylase.

Sugarcane is a monocot plant that accumulates sucrose to levels of up to 50% of dry weight in the stalk. The mechanisms that are involved in sucrose accumulation in sugarcane are not well understood, and little is known with regard to factors that control the extent of sucrose storage in the stalks. UDP-glucose pyrophosphorylase (UGPase; EC 2.7.7.9) is an enzyme that produces UDP-glucose, a key precursor for sucrose metabolism and cell wall biosynthesis. The objective of this work was to gain insights into the ScUGPase-1 expression pattern and regulatory mechanisms that control protein activity. ScUGPase-1 expression was negatively correlated with the sucrose content in the internodes during development, and only slight differences in the expression patterns were observed between two cultivars that differ in sucrose content. The intracellular localization of ScUGPase-1 indicated partial membrane association of this soluble protein in both the leaves and internodes. Using a phospho-specific antibody, we observed that ScUGPase-1 was phosphorylated in vivo at the Ser-419 site in the soluble and membrane fractions from the leaves but not from the internodes. The purified recombinant enzyme was kinetically characterized in the direction of UDP-glucose formation, and the enzyme activity was affected by redox modification. Preincubation with H2O2 strongly inhibited this activity, which could be reversed by DTT. Small angle x-ray scattering analysis indicated that the dimer interface is located at the C terminus and provided the first structural model of the dimer of sugarcane UGPase in solution.

Effect Of Sodium Hypochlorite And Peracetic Acid On The Surface Roughness Of Acrylic Resin Polymerized By Heated Water For Short And Long Cycles.

To evaluate the surface roughness of acrylic resin submitted to chemical disinfection via 1% sodium hypochlorite (NaClO) or 1% peracetic acid (C2H4O3). The disc-shaped resin specimens (30 mm diameter ×4 mm height) were polymerized by heated water using two cycles (short cycle: 1 h at 74°C and 30 min at 100°C; conventional long cycle: 9 h at 74°C). The release of substances by these specimens in water solution was also quantified. Specimens were fabricated, divided into four groups (n = 10) depending on the polymerization time and disinfectant. After polishing, the specimens were stored in distilled deionized water. Specimens were immersed in 1% NaClO or 1% C2H4O3 for 30 min, and then were immersed in distilled deionized water for 20 min. The release of C2H4O3 and NaClO was measured via visual colorimetric analysis. Roughness was measured before and after disinfection. Roughness data were subjected to two-way ANOVA and Tukey's test. There was no interaction between polymerization time and disinfectant in influencing the average surface roughness (Ra, P = 0.957). Considering these factors independently, there were significant differences between short and conventional long cycles (P = 0.012), but no significant difference between the disinfectants hypochlorite and C2H4O3 (P = 0.366). Visual colorimetric analysis did not detect release of substances. It was concluded that there was the difference in surface roughness between short and conventional long cycles, and disinfection at acrylic resins polymerized by heated water using a short cycle modified the properties of roughness.