Análisis cinético de la fase de transición de reacciones enzimáticas tri sustrato que siguen un mecanismo al azar B-C Uni Uni Bi Bi Ping Pong

Resumen tomado de la publicación

Hodder science. Summary book A, B, C.

Proporciona todo el material necesario para la consolidación y la síntesis de la ciencia en la etapa clave tres (Key Stage 3). Cada concepto se presenta en un formato fácil de leer, diseñado para ayudar a los alumnos a comprender los temas , realizar actividades de revisión y preparar las pruebas nacionales. Sus contenidos tratan de:vida; cuerpo humano; cosas de la vida y el medio ambiente; partículas; reacciones químicas; rocas y el medio ambiente, energía y electricidad; espacio, fuerza y movimiento; luz y sonido. Al final de la publicación hay un glosario.

Actividades actuales del Centro de Investigación y de Estudios para la difusión del Francés (C.R.E.D.I.F.).

Se analizan las últimas investigaciones lingüísticas y metodológicas desarrolladas en el Centro de Investigación y de Estudios para la difusión del Francés (C.R.E.D.I.F.), centrándose en las actividades de Saint-Cloud en torno a la enseñanza de la lengua francesa como lengua extranjera. Se destacan cuatro apartados sobre las actividades del centro: 1. Las experiencias terminadas relativas al desarrollo de nuevos métodos de enseñanza del francés. 2. Las experiencias en curso de realizarse para el desarrollo de métodos didácticos novedosos. 3. Desarrollo de cursos de perfeccionamiento del profesorado de lengua francesa. 4. El establecimiento de las necesidades más urgente del C.R.E.D.I.F..

Solar ultraviolet-B radiation and vitamin D: a cross-sectional population-based study using data from the 2007 to 2009 Canadian Health Measures Survey

Background: Exposure to solar ultraviolet-B (UV-B) radiation is a major source of vitamin D3. Chemistry climate models project decreases in ground-level solar erythemal UV over the current century. It is unclear what impact this will have on vitamin D status at the population level. The purpose of this study was to measure the association between ground-level solar UV-B and serum concentrations of 25-hydroxyvitamin D (25(OH)D) using a secondary analysis of the 2007 to 2009 Canadian Health Measures Survey (CHMS). Methods: Blood samples collected from individuals aged 12 to 79 years sampled across Canada were analyzed for 25(OH)D (n=4,398). Solar UV-B irradiance was calculated for the 15 CHMS collection sites using the Tropospheric Ultraviolet and Visible Radiation Model. Multivariable linear regression was used to evaluate the association between 25(OH)D and solar UV-B adjusted for other predictors and to explore effect modification. Results: Cumulative solar UV-B irradiance averaged over 91 days (91-day UV-B) prior to blood draw correlated significantly with 25(OH)D. Independent of other predictors, a 1 kJ/m 2 increase in 91-day UV-B was associated with a significant 0.5 nmol/L (95% CI 0.3-0.8) increase in mean 25(OH)D (P =0.0001). The relationship was stronger among younger individuals and those spending more time outdoors. Based on current projections of decreases in ground-level solar UV-B, we predict less than a 1 nmol/L decrease in mean 25(OH)D for the population. Conclusions: In Canada, cumulative exposure to ambient solar UV-B has a small but significant association with 25(OH)D concentrations. Public health messages to improve vitamin D status should target safe sun exposure with sunscreen use, and also enhanced dietary and supplemental intake and maintenance of a healthy body weight.

On (b,c)-system at finite temperature in thermo field approach

We construct the finite temperature field theory of the two-dimensional ghost-antighost system within the framework of thermo field theory. (C) 2000 Elsevier B.V. B.V. All rights reserved.

Observation of Single Top-Quark Production

We report observation of the electroweak production of single top quarks in pp collisions at s=1.96 TeV based on 2.3 fb(-1) of data collected by the D0 detector at the Fermilab Tevatron Collider. Using events containing an isolated electron or muon and missing transverse energy, together with jets originating from the fragmentation of b quarks, we measure a cross section of sigma(pp -> tb+X,tqb+X)=3.94 +/- 0.88 pb. The probability to measure a cross section at this value or higher in the absence of signal is 2.5x10(-7), corresponding to a 5.0 standard deviation significance for the observation.

O A.B.C. de Lima Barreto (1916-1922)

Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)

Collection of Pollen Grains by Centris (Hemisiella) tarsata Smith (Apidae: Centridini): Is C. tarsata an Oligolectic or Polylectic Species?

Lia Goncalves, Claudia Ines da Silva, and Maria Luisa Tunes Buschini (2012) Collection of pollen grains by Centris (Hemisiella) tarsata Smith (Apidae: Centridini): Is C. tarsata an oligolectic or polylectic species? Zoological Studies 51(2): 195-203. Among pollinator species, bees play a prominent role in maintaining biodiversity because they are responsible, on average, for 80% of angiosperm pollination in tropical regions. The species richness of the bee genus Centris is high in South America. In Brazil, these bees occur in many types of ecosystems. Centris tarsata is an endemic species occurring only in Brazil. No previous studies considered interactions between plants and this bee species in southern Brazil, where it is the most abundant trap-nesting bee. Accordingly, the goals of this study were to investigate plants used by this species for its larval food supply and determine if this bee is polylectic or oligolectic in this region. This work was conducted in the Parque Municipal das Araucarias, Guarapuava (PR), southern Brazil, from Mar. 2002 to Dec. 2003. Samples of pollen were collected from nests of these bees and from flowering plants in grassland and swamp areas where the nests were built. All of the samples were treated with acetolysis to obtain permanent slides. The family Solanaceae was visited most often (71%). Solanum americanum Mill. (28.6%) and Sol. variabile Mart. (42.4%) were the primary pollen sources for C. tarsata in the study area. We found that although C. tarsata visited 20 species of plants, it preferred Solanum species with poricidal anthers and pollen grains with high protein levels. This selective behavior by females of C. tarsata indicates that these bees are oligolectic in their larval provisioning in this region of southern Brazil. http://zoolstud.sinica.edu.tw/Journals/51.2/195.pdf

A history of the religion of Judaism 500 to 200 b. C.

Archibald Duff

Zionistisches A-B-C-Buch

hrsg. ... von der Zionistischen Vereinigung für Deutschland

Types of Jewish-Palestinian piety : from 70 B.C.E. to 70 C.E. ; the ancient pious men

by Adolph Büchler

Das republikanische A B C

Boberach: Die Reichsverfassung soll die Menschenrechte garantieren und die Pflichten der Staatsbürger regeln. Republikanische Prinzipien sollen für die Gemeinden, die Kreise, die Staaten und das Reich gelten, das aus 19 Gliedstaaten bestehen soll. Als Organe sind vorgesehen: Reichstag (Oberhaus und Unterhaus), Reichsrat, Reichsobmann, der von den Landtagen gewählt wird, Reichsgericht mit Laienmehrheit, Heerwesen, Steuerangelegenheiten, Kirchen- und Schulwesen sind den Gemeinden zu überlassen. Eine allgemeine Einkommensteuer soll die Landesbedürfnisse, eine Luxussteuer soll Gemeinden und Kreise, Zölle auf Luxuswaren und ausländische Produkte die Ausgaben des Reiches finanzieren