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Digital.CSIC (64,039 recursos)
Repositorio institucional del Consejo Superior de Investigaciones Científicas. Digital.CSIC es un depósito de documentos digitales, cuyo objetivo es organizar, archivar, preservar y difundir en modo de acceso abierto la producción intelectual resultante de la actividad investigadora del CSIC.

(IPNA) Artículos post-print

Mostrando recursos 1 - 20 de 172

1. Tetralkylammonium permanganate epoxidation of an uncreactive double bond by an intramolecular oxygen-atom transfer process - Robles Caycho, Juana; García-Tellado, Fernando; De Armas, Pedro; Marrero-Tellado, José Juan
The ammonium permanganate oxidation of a tricyclic, rigid diene gives the mono- dihydroxylated compound together with the diol- epoxide derivative. The epoxidation involves an intramolecular oxygen- atom transfer process from the anchored manganese (V) diester to the second double bond.

2. Seasonal diet of the Grey Heron Ardea cinerea on an oceanic island (Tenerife, Canary Islands): indirect interaction with wild seed plants - Rodríguez, Airam; Rodríguez, Beneharo; Rumeu, Beatriz; Nogales, Manuel
A total of 7460 prey items were counted in the 199 pellets analysed, of which 96.2% corresponded to arthropods. Aeshnidae larvae (Odonata) made up 66.1% of total prey items and were the main invertebrate group. Vertebrates constituted 3.8%, while reptiles and mammals were the main prey (1.8%, respectively). Despite the small size of the invertebrates, this group reached > 60% in terms of biomass. All main prey items varied significantly among seasons. Odonata was the most important group for all seasons, reaching its maximum value in summer. In the case of vertebrates, reptiles were mainly captured in spring and mammals...

3. Prey size selection of insular lizards by two sympatric predatory bird species - Pérez Padilla, David; Nogales, Manuel; Marrero, Patricia
Size-related selection of insular lizards by two sympatric predatory bird species (Southern Grey Shrike and Eurasian Kestrel) was studied in an arid insular environment. The endemic lizard genus Gallotia was a key resource in the diet of both predators, constituting more than 50% of the total biomass. Shrikes captured smaller lizards than kestrels during all seasons (mean snout-vent length (SVL): 7.4 ± 1.9 vs. 9.4 ± 2.1 cm respectively), presenting a sequential use of lizard sizes and avoiding potential competition. On the other hand, shrikes and kestrels showed the same seasonal variation pattern, capturing the largest lizards during their breeding...

4. Breeding biology of Grey Wagtail Motacilla cinerea canariensis on Tenerife, Canary Islands - Rodríguez, Beneharo; Rodríguez, Airam
The paper reports on the breeding biology of the endemic subspecies of the Grey Wagtail in a human transformed area (banana plantations) on Tenerife (Canary Islands). Clutch size (3.96 ± 0.6) was lower than in continental zones, probably because of the climatic stability of the islands. Furthermore, the distance from the nest to the nearest water source and the length of the breeding season (late February–June) were greater than in other European populations. Some breeding traits fit the predictions of the so-called insular “syndrome”. Possible mechanisms underpinning these differences in breeding traits are discussed.

5. Ecological effects and distribution of invasive non-native mammals on the Canary Islands - Nogales, Manuel; Rodríguez Luengo, Juan Luis; Marrero, Patricia
1. The ecological effects and distribution of 13 invasive non-native mammal species on the Canary Islands are reviewed.

6. Elenoside increases intestinal motility - Navarro, Eduardo; Alonso, Jesús; Navarro, Ricardo; Trujillo, Juan M.; Jorge, Elena
[Aim] To study the effects of elenoside, an arylnaph-thalene lignan from Justicia hyssopifolia, on gastro-intestinal motility in vivo and in vitro in rats.

7. 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.

8. 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...

9. Shrikes, lizards and Lycium intricatum (Solanaceae) fruits: a case of inditrect seed dispersal on an oceanic island (Alegranza, Canary Islands) - Nogales, Manuel; Delgado, J. D.; Medina, Félix M.
Island ecosystemes, often represented by relict fauna and flora, harbour some important examples of herbivory by lizards (e.g. Sadek 1981; Machado 1985; Feller & Drost 1991; Naranjo et al.. 1991; Sáez & Traveset 1995).

10. 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...

11. 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...

12. Breve nota sobre el Roque Grande de Salmor (El Hierro, Islas Canarias) y su población de Gallotia galloti caesaris (Lehrs 1914) (F. Lacertidae) - Nogales, Manuel; Hernández, E.; Delgado, Guillermo; Quintero, A.
The floristic and faunistic communities of Roque Grande de Salmor off the North coast of El Hierrro is described in the highest part of the islet, a small previously unrecorded population of Gallotia galloti caesaris has been found.

13. Reagents with Hypervalent Iodine: Formation of Convenient Chiral Synthetic Intermediates by Fragmentation of Carbohydrate Anomeric Alkoxy Radicals - Armas, Pedro de; Francisco, Cosme G.; Suárez, Ernesto
Cleavage of the C1-C2 bond in carbohydrates is achieved via the related alkoxy radicals by adding (diacetoxyiodo)benzene (DIB) to the substrate in the presence of iodine [Eq.(a)]. The course of the reaction is independent of the protecting groups R, the ring size, and the configuration of the substrate at C2. The cleavage products are valuable chiral building blocks.

14. 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.

15. Contribution a l'étude de la fertilité des sols de bananeraies de l'île de Tenerife - Fernández Caldas, E.; García, V.
Il s'agit de l'étude des caractéristiques chimiques des sols de bananeraies de Tenerife, déterminent les niveaux de P2O5, K2O, pH, CO3Ca, matière organique, capacité d'échange, cations échangeables et pourcentages d'humidité de la pâte saturée dans les différentes zones de l'île.

16. 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.

17. 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...

18. Estudio comparativo de las relaciones Q/I de potasio en diferentes tipos de suelo de la Isla de Tenerife (III) - Hernández Moreno, J.; Fernández Caldas, E.; Borges-Pérez, Andrés
Potasium Q/I relationships of three soils groups: Andosols, Vertisols and Brown Earths of Tenerife Island are compared. The highest values of both PBCK y PBCKE correspond to the Vertisol group and the lowest to the Andosol group. The superimposed Q/I curves for all profiles show an agroupment according to the soil type in the more evolutionated horizons.

19. 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...

20. 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...

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