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(IPNA) Artículos post-print
Mostrando recursos 1 - 20 de 166
1-(1,5-Dimethylhexyl)-3a,5b,12a,14a-tetramethyl-2,3,3a,4,5,5a,5b,11,12,13,14,14a-dodecahydro-1H,12aH-cyclopenta[1,2]phenanthro[7,8-b]indole - López Rodríguez, Matías; Mazoir, Noureddine; Daoubi, Mourad; Reina, Matías; Benharref, Ahmed
The title compound, C35H51N, is a semi-synthesized derivative obtained from 4α,14α-dimethyl-5α-cholest-8-en-3β-ol, a major triterpene isolated from Euphorbia officinarum latex. The molecular structure was established by H-1 and C-13 NMR spectroscopy and confirmed as having the stereochemistry at the new C11b stereocenter by single-crystal X-ray diffraction. The planar indole group is folded over the extended tetracyclic perhydrocyclopentanephenanthrene triterpene skeleton. There are no π-π interactions between the indole ring systems.
First breeding record of Macaronesian Shearwater Puffinus Baroli Baroli in El Hierro (Canary Islands) - Rodríguez, Airam; Pérez Padilla, David
Breeding biology of Macaronesian Shearwater is not well known, especially in the Atlantic Ocean (MOUGIN et al., 1992; ZINO & BISCOITO, 1994). In the Canary Islands, only some isolated breeding data are available, but, it is assumed that the majority of laying occurs in January and February, although later birds could lay on May
(see MARTÍN & LORENZO, 2001). In other areas, the
chronology and total length of the breeding period is rather variable (SNOW, 1965; WARHAM, 1990; MOUGIN et al., 1992; BOOTH et al., 2000;
BRETAGNOLLE et al., 2000). At the moment, in this
archipelago, breeding has been confirmed in
Tenerife, La Gomera, Lanzarote...
The response of the variety Abadia to added phosphorus and the intensity and the replenishment, factors of soils from the Ebro valley - Eleizalde Luzárraga, María Benigna; Alvarez, C. E.; Díaz, A.; García, V.
The relations between the uptake of phosphorus by a plant and fertility factors are studied. The wheat variety Abadia was grown under greenhouse at different levels of monocalcium phosphate according to the physico-chemical properties of the Brown Earths, Xerorendzines and Brown Soils, the soils in which these relations are evaluated.
There is a positive response to added P, with and increase in dry matter production and phosphorus content in this variety of wheat.
Both the dry matter production and the phosphorus content are related to the intensity factor, the maximum production being attained at concentration of 0.70 and 0.80 ppm in Brown...
Phosphorus uptake by Abadia variety wheat grown in soils of Ebro Valley - Eleizalde Luzárraga, María Benigna; García, V.; Díaz, Amalia; Alvarez, C. E.
Under greenhouse conditions the P uptake by wheat is studied and soil P extracted by three laboratory tests is compared.
In these soils the critical level of available P depends on the laboratory method used. Thus for the Burriel-Hernando extracting solution, it is 80 ppm while the method of Olsen gives a value of 60 ppm: the lowest concentration being obtained by the procedure of van der Paaw-Sissingh 40 ppm.
The regressions of plant yield on soil P extracted are studied to the critical level and equations are obtained which help to determine the amount to be applied to the soil. Differences...
Tolérance du bananier aux eaux bicarbonatées (eaux souterraines de Ténérife) - Fernández Caldas, E.; Pérez García, V.; Borges-Pérez, Andrés
Des eaux fortement bicarbonatées sont utilisées pour l'irrigation des bananeraies dans l'ile de Ténérife (Canarias). On étudie l'influence de ces eaux sur la formation éventuelle de sols salins ou alcalins. En dépit des caractéristiques chimiques de ces eaux, aucun de ces effets ne sont observés.
Étude comparative de la fertilité des sols de bananeraies aux îles Canaries - Fernández Caldas, E.; García, V.; Gutiérrez Jerez, Francisco José; Bravo Rodríguez, J. M.
Étude des différences et caractéristiques principales del sols de bananeraies des Îles Canaries. Données relatives aux influences climatiques sur ces caractéristiques pour les différentes îles et selon les versants dans chaque île. pH. CO3Ca et K présentent les plus grandes variations en fonction du climat et des matériaux d'origine.
Les réserves de potassium dans les sols de bananeraies aux Canaries - Fernández Caldas, E.; Borges-Pérez, Andrés
Eu égard aux besoins potassiques particulierement élevés du bananier, on a complété la détermination de K assimilable ou échangeable dans divers sols de Ténérife par celle de leurs réserves assimilables totales en potassium, au moyen d'extractions successives par C12Ca 0,01 N. Ces réserves, déja extraordinairement élevées dans deux parcelles ne recevant plus d'engrais potassique depuis 9 ans, proviennent de feldspaths potassiques. Elles sont en général encore supérieures dans les parcelles fertilisées annuellement a la potasse. L'étude selon HAGIN des variations d'energie libre montre en outre qu'il faut un appauvrissement tres pouseé pour atteindre le niveau de déficience de K vis-a-vis...
Discovery of a living giant lizard, genus Gallotia (Reptilia: lacertidae), from La Gomera, Canary Islands - Nogales, Manuel; Rando, J. Carlos; Valido, Alfredo; Martín, Aurelio
We describe the external morphology of a new giant lizard found alive on La Gomera Island (Canarian Archipelago), which had been previnusly described from subfossil bones. Adult size (SVI, 135-190 mm) is comparable with the two largest living species (G. simonyi and G. stehlini) of the genus. It differs from the other species of Gallotia in the low number of temporal scales (21-27), presence of one elougate interprefrontal scale (linearly depressed in center) that is very infrequent in most of its congeners (small when it is present), having two distinetive lateral lines of small blue spots, and in having a...
Discovery of a new lizard in the Canary Islands, with a multivariate analysis of Gallotia (Reptilia: Lacertidae) - Hernández, Efraín; Nogales, Manuel; Martín, Aurelio
We describe a new species of Gallotia from Tenerife (Canary Islands). This lizard is intermediate in size between the two smaller (G. atlantica and G. galloti) and the two larger (G. simonyi and G. stehlini) species. Furthermore, it differs from the two similar larger Gallotia in the number of supratemporal scales (mode 4 instead of mode 2), usually 16 longitudinal ventral scalerows, and having distinctive dorsal yellow spots, and small lateral yellow or blue spots. Individuals from a small population located in La Hábiga show a pale gray reticulation on dorsum and absence of ocelli in the lateral region. Univariate...
On the presence of the endemic skink Chalcides simonyi Steind., 1891 in Lanzarote (Canary Islands) - Nogales, Manuel; De León, Leandro; Gómez, Rafael
The Canarian herpetofauna is characterized by a high number of endemic species (Machado et al., 1985). Reptiles in this archipelago are exclusively represented by tyhree families: Lacertidae, Gekkonidae and Scincidae, Chalcides being the only genus of the family Scincidae in the Canary Islands. This genus includes three endemic species, C. viridanus from Tenerife, La Gomera and El Hierro, C. sexlineatus from Gran Canaria, and C. simonyi up to now only known for the island of Fuerteventura. Therefore, skinks were present in fgive of the seven main islands, except Lanzarote and La Palma (Bischoff, 1985).
Despite Lanzarote being only 10 km away...
A review on the effects of alien rodents in the Balearic (Western Mediterranean Sea) and Canary Islands (Eastern Atlantic Ocean) - Traveset, Anna; Nogales, Manuel; Alcover, Josep Antoni; Delgado, J. D.; López-Darias, Marta; Godoy, D.; Igual, José Manuel; Bover, Pere
Invasions of alien rodents have shown to have devastating effects on insular ecosystems. Here we review the ecological impacts of these species on the biodiversity of the Balearic and the Canary Islands. A total of seven species of introduced rodents (two rats, three mice, one dormouse, and one squirrel) have been recorded (six in the Balearics and four in the Canaries). Some of them can occasionally be important predators of nesting seabirds, contributing to the decline of endangered populations in both archipelagos. Rats are also known to prey upon terrestrial birds, such as the two endemic Canarian pigeons. Furthermore, rats...
Chemical composition and biological effects of essential oils from Artemisia absinthium L. cultivated under different environmental conditions - Bailen, María; Julio, Luis F.; Diaz, Carmen E.; Sanz, Jesús; Martínez-Díaz, Rafael A.; Cabrera, Raimundo; Burillo, Jesús; González-Coloma, Azucena
The objective of this study was the valorization of the essential oils from Spanish Artemisia absinthium domesticated plants from Teruel and Sierra Nevada (Spain). These populations were experimentally cultivated in the field and under controlled conditions. The insect antifeedant properties of their essential oils collected yearly from two locations were tested against Spodoptera littoralis, Myzus persicae and Rhopalosiphum padi. Additionally we studied their phytotoxic, antifungal and antiparasitic effects. The oils from cultivated A. absinthium were characterized by the presence of cis-epoxyocimene, chrysanthenol, and chrysanthenyl acetate. The variations observed in oil composition were mostly quantitative but also qualitative. (Z)-2,6-Dimethyl-5,7-octadien-2,3-diol has been...
Características de los materiales amorfos (SiO2, Fe2O3 y Al2O2) en diferentes tipos de andosoles - Hernández Moreno, J. M.; Cabezas Viaño, O.; Fernández Caldas, E.; Tejedor Salguero, Mª L.
Amorphous materials (Fe2O3. Al2O3. SiO2) are studied in Typic Vitrandepts as well as a comparative study with amorphous materials of Integrades Andosol-Oligotrophic Brown Earth. Dystrandepts and evolutionated vitrandepts of the Canary Islands. This study reveal a differem evolution of these materials according to the type of Andepts, wich depend of the climate and parent material age.
Diet of common ravens on El Hierro, Canary Islands - Nogales, Manuel; Hernández, Elizabeth C.
The Common Raven (Carvus coraxi on El Hierro, an oceanci island in the Canary archipelago, is omnivorous. Although ravens from five regions on El Hierro showed qualitatively similar diets, there were considerable quantitative differences. Diet in wet and dry pastureland was made up principally of animals invertebrates at Jinama (frecuency of occurrence in pellets = 84.8%) and high levels of vertebrates at Bascos (60%). Spring was characterized by the consumption of vertebrates (frecuency in pellets = 48.5%), summer by invertebrates (77.1%), and autumn/winter by a diet of plant material (92.6% and 96.9%, respectively). White diets in many continental environments are...