Diferencias biométricas relacionadas con el sexo y la edad en una población ibérica de Pechiazul (Luscinia svecica cyanecula)

S'analitzen els resultats obtinguts dels valors de l'ala (corda màxima), longitud de la tercera primària, longitud del tars i massa corporal en 93 exemplars de cotxa blava capturats en dues localitats dels voltants dels Montes de León. La comparació de les mesures entre mascles i femelles va mostrar diferències significatives en la corda màxima alar i la tercera primària, i es van revelar com a mesures útils per a la discriminació de sexes. Contràriament, no es van trobar diferències en les mesures del tars i la massa corporal. Quan es comparen aquestes mesures entre mascles joves i adults, només apareixen diferències significatives en la mida de la longitud de la tercera primària

Coherently manipulating flying qubits in a quantum wire with a magnetic impurity

e study the effect of a magnetic impurity with spin-half on a single propagating electron in a one-dimensional model system via the tight-binding approach. Due to the spin-dependent interaction, the scattering channel for the flying qubit is split, and its transmission spectrum is obtained. It is found that, the spin orientation of the impurity plays the role as a spin state filter for a flying qubit.Comment: 6 pages, 5 figure

Chaotic Genetic Algorithm and The Effects of Entropy in Performance Optimization

This work proposes a new edge about the Chaotic Genetic Algorithm (CGA) and the importance of the entropy in the initial population. Inspired by chaos theory the CGA uses chaotic maps to modify the stochastic parameters of Genetic Algorithm (GA). The algorithm modifies the parameters of the initial population using chaotic series and then analyzes the entropy of such population. This strategy exhibits the relationship between entropy and performance optimization in complex search spaces. Our study includes the optimization of nine benchmark functions using eight different chaotic maps for each of the benchmark functions. The numerical experiment demonstrates a direct relation between entropy and performance of the algorithm.Comment: 8 pages, 4 figures, 31 references. Accepted for publication in Chaos: An Interdisciplinary Journal of Nonlinear Scienc

Notas briológicas de la provincia de Vizcaya. I. Estudio de las comunidades de esfagnos del Puerto de Urquiola

Hemos estudiado los esfagnos y las comunidades higro-turbosas del Puerto de Urquiola (Vizcaya). Se han recolectado 10 especies de Sphagnum, de ellas, 8 especies son nuevas citas para Vizcaya.Del estudio fìtosociológico de las comunidades, se describe la subasociación Sphagnetosum crassicladi subas. nova.We have studied the sphagnum and the damp boggy comunities of the Puerto de Urquiola (Vizcaya). We have collected 10 species of Sphagnum, from these, 8 species are new records for Vizcaya. From the syntaxonomic study of the comunities, we describe for the first time Helodo-Sphagnetum Lemée 1937, Sphagnetosum crassicladi subas. nova

Novel and efficient syntheses of 3',5'-diamino derivatives of 2',3',5'-trideoxycytidine and 2',3',5'-trideoxyadenosine. Protonation behavior of 3',5'-diaminonucleosides

This work has been supported by grants from MCYT (Spain; Project PPQ-2001-2683) and the Principado de Asturias (Spain; Project GE-EXP01-03). S. F. thanks MCYT for a personal grant (Ramón y Cajal Program). I. L. thanks MCYT (Spain) for a predoctoral fellowship. We thank Robin Walker for his revision of the English of the manuscrip

Selective acylation of A-ring precursors of vitamin D using enzymes in organic solvents

We express our appreciation to Genzyme Co. for a generous gift of CVL. Financial support from National Institutes of Health (Grant No. DK-16595)is gratefully acknowledged. M.F. also thanks the Ministerio de Educación y Ciencia of Spain for a postdoctoral fellowshi

Associations among maternal representations at birth and at tachment in portuguese dyads with preterm and full term infants

Este estudio longitudinal investigó la relación entre: representaciones maternas al nacer, representaciones maternas del temperamento de sus bebés (a los 9 meses) y el apego madre-hijo a los 57 díadas con bebés nacidos prematuramente y 60 días con bebés recién nacidos a término. Cuarenta y ocho horas después del nacimiento, una entrevista fue preformada para recoger las representaciones de las madres de su embarazo, el parto, y de sus recién nacidos. Nuestros resultados indican que las madres que dan a luz prematuramente tenían más percepciones negativas acerca de su embarazo y parto. Estas madres estaban más preocupadas por la salud y el desarrollo de su bebé. Sin embargo, estaban tan seguras como las madres de a término de su capacidad para entablar en una relación positiva con su niño. A los nueve meses, las representaciones maternales positivas del temperamento de niños nacidos prematuramente se asociaron en positivo con expectativas sobre el desarrollo de sus bebés y el apoyo social de la familia al nacer. A los 12 meses, el apego seguro estaba relacionado con las representaciones maternas a los nueve meses.This longitudinal study investigated the relation between: maternal representations at birth; maternal representations of their infants’ temperament (at 9 months); and mother-infant attachment in 57 dyads with infants prematurely born and 60 dyads with infants born at term. Forty eight hours after birth, an interview was preformed to collect mothers’ representations of their pregnancy, labor, and about their newborns. Our findings indicate that mothers that delivered prematurely had more negative perceptions about their pregnancy and labor. These mothers were more concerned about their infant’s health and development. Nonetheless, they were as confident as mothers of at term infants in their ability to engage in a positive relationship with their infant. At nine months, maternal positive representations of prematurely born infants’ temperament were associated with positive expectations about their babies’ development and family social support at birth. At 12 months, secure attachment was related with maternal representations at nine months.peerReviewe