Genetic control of purothionins in wheat: problems of the aneuploid analysis when searching for regulatory genes

The study of the genetic control of purothionins in wheat endosperm illustrates some of the problems and pitfalls faced in aneuploid analysis of regulatory effects. Biochemical and genetic evidence is presented indicating that the possible regulatory effect of genes located in group 5 chromosomes on the expression of the purothionin structural genes located in group 1 chromosomes is not actually operating "in vivo"

Expression of homoeologous molecular systems in wheat alloploids

Allopolyploidy is widespread in the plant kingdom, where it has been of considerable evolutionary significance. Although the existence of heterotic interactions between the genomes that make up an alloploid have been generally assumed, the precise nature of these interactions has not been extensively investigated. Presently available evidence about metabolic integration of the wheat genomes is examined in search of new insights about the different modes of genome interaction. Although additive expression seems to be the case for many homoeologous systems, more complex patterns of integration have become evident. Examples of enzyme subunit complementation, gene compensation and other dosage effects, holoprotein completion, and complementation of metabolic pathways are discussed

De churras y de merinas: ¿biodiversidad en la ingeniería? Discurso del Académico electo Excmo. Sr. D. Roberto Fernández de Caleya y Álvarez, leído en el acto de recepción pública el día 30 de octubre de 2001 y contestación del académico Excmo. Sr. D. José Antonio Martín Pereda

En esta obra se recoge el discurso que pronunció D. Roberto Fernández de Caleya al ser nombrado miembro de la Academia de Ingeniería y la contestación de Martín Pereda, donde recuerda y analiza la trayectoria vital y académica del nuevo académico

Homoeologous chromosomal location of the genes encoding thionins in wheat and rye

Thionins are high sulphur basic polypeptides present in the endosperm of Gramineae. In wheat there are three thionins encoded by genes located in the long arms of chromosomes 1A, 1B and 1D. Rye has one thionin encoded by a gene which has been assigned to chromosome 1R after analysis of the Imperial-Chinese Spring rye-wheat disomic addition lines. Commercial varieties and experimental stocks with a 1B/1R substitution carry the thionin from rye ( R) instead of the B thionin from wheat. The R thionin gene is not located in the large chromosomal segment representing most of the short arm of chromosome 1R

PLANTAS CUBANAS Y DOCUMENTOS DE LA OSSA EN EL REAL JARDÍN BOTÁNICO DE MADRID

[EN]A study of the vascular plant specimens collected by the cuban eighteenth century botanist la Ossa and kept in MA herbarium as well as of related manuscript.[DE]Es werden die albanische Materiale aus MA (Farn- und Samenpflanzen), von La Ossa gesammelt, sowie die Manuskripte von diesem Autor, studiert.[ES]Estudio de materiales correspondientes a plantas vasculares cubanas, colectadas por la Ossa, conservados en el herbario MA, y del correspondiente manuscrito.Peer reviewe

Los herbarios de las expediciones científicas españolas al Nuevo Mundo

The herbaria compounded by the botanical Spanish expeditions to the New World during the XVIIIth Century constitutes one of the most important treasures of the Royal Botanical Garden from Madrid. These collections of dry plants document the existence of the species in time and in space, and they are essential resources for the botanical investigation. The specimens type and of reference of these collections are fundamental for the correct identification of each species and their varieties. They are used as to give validity to the botanical investigation securing that one could repeat or compare with nature investigations.Los herbarios confeccionados por las expediciones botánicas españolas al Nuevo Mundo durante el siglo XVIII constituyen uno de los tesoros más importantes del Real Jardín Botánico de Madrid. Estas colecciones de plantas secas documentan la existencia de las especies en el tiempo y en el espacio, son recursos esenciales para la investigación botánica. Los ejemplares tipo y de referencia de estas colecciones son fundamentales para la exacta identificación de cada especie y sus variedades. Sirven para dar validez a la investigación botánica asegurando que se pueda repetir o comparar con investigaciones futuras

Low cost time division multiplexing of identical optical fibre ring intensity sensors

A time division multiplexing (TDM) array for passive multiplexing of identical fibre, optic intensity sensors has been demonstrated. Microbending loss sensors are introduced in fibre optic rings and pressure information is directly detected, demultiplexed and demodulated from the relative amplitude of the first two pulses produced on each ring. Several dynamic ranges from 6 dB to 14 dB are shown. A comparison between both fibre optic ring and Mach-Zehnder structure impulse responses is carried out and the consequences derived from second- and higher-order recirculating ring pulses are also evaluated. This technique can be applied to those TDM intensity sensing schemes which require low cost, high number of identical sensors, and suffer high element loss and undersirable intensity fluctuations at low frequencies