1,720,985 research outputs found
Ibn Zurʿa on Intellect. A Study and an Annotated Translation of Treatise no. 4 Sbath
No full textThe article provides a study and an annotated translation of an Arabic treatise on the trinity and the intellect by the West-Syriac Christian theologian Ibn Zurʿa (d. 1008 AD). The preliminary study examines the sources bearing witness to Ibn Zurʿa’s interest in the study of soul and intellect; it also discusses a text by Ibn Zurʿa in which he mentions Plato (echoing the Phaedo) and Aristotle’s De anima as philosoph-ical authorities who proved the immortality of the soul. The article then analyzes structure, attribution, and doctrinal contents of Ibn Zurʿa’s treatise, highlighting its links to the thought and works of Ibn Zurʿa’s teacher, Yaḥyà b. ʿAdī (d. 974 AD). The English translation is based on a revision of Sbath’s edition through a collation of the manuscripts available to the author of the article
Genetic transformation and regeneration of transgenic plants in grapevine (Vitis rupestris S.)
No full textsolated somatic embryos from petiole-derived callus cultures ofVitis rupestris Scheele have been employed in experiments on genetic transformation. Co-cultivation of somatic embryos during embryogenesis induction withAgrobacterium tumefaciens strain LBA4404, which contains the plasmid pBI121 carrying the neomycin phosphotranspherase and theβ-glucuronidase genes, produced transformed cellular lines capable of recurrent somatic embryogenesis. Precocious selection for high levels of kanamycin (100 mgl-1) was an important part of our transformation protocol. Transformed lines still have strongβ-glucuronidase expression as well as stable insertion of the marker genes after 3 years of in-vitro culture, during which they have maintained their capacity to organize secondary embryos and to regenerate transgenic plants with an agreeable efficiency (13%
OXIDATION OF EXTERNAL NAD(P)H BY MITOCHONDRIA FROM TAPROOTS AND TISSUE-CULTURES OF SUGAR-BEET (BETA-VULGARIS)
No full textThe present study compares the exogenous NAD(P)H oxidation
and the membrane potential (A of mitochondria from
cold-stored taproots and from tissue cultures was not affected by
free Caz+ ions, whereas free CaZ+ was required for the mitochondrial
NADPH oxidation by in vitro-grown cells and cytosolic NADH
oxidation by mitochondria from fresh taproots. A tentative model
accounting for the different response to Caz+ ions of the NADH
dehydrogenase in mitochondria from cold-stored taproots and
tissue cultures of B. vulgaris is discussed
Effects of gamma-ray treatment on Cannabis sativa pollen viability
No full textThe viability and the in vitro germination capability of hemp pollen (cv. Carmagnola) were studied. Viability tests
were based on the microscopic observation of the fluorescence of loaded fluorescein diacetate (FDA), while, for
germinability tests, five different media were tested. The effects of irradiation with 7-rays on pollen viability and
germination and on seed set were also studied, at three different irradiation doses (20, 60 and 100 krad). The results
show that in one of the media tested, about 85-90% of the pollen grains are viable and able to germinate in control
samples, and that while viability measured by FDA test is not affected by increased 7-ray doses, the pollen in vitro
germinability drops to about one-half of the controls at the maximum "y-ray dose employed, 100 krad. Seed set of
hemp plants pollinated with the irradiated pollen dropped to less than 1% of that of plants pollinated by untreated
pollen for the higher dose used. The different media suitable for in vitro germination of hemp pollen, and the
observed lack of correspondence between viability and germination capacity tests are discussed
Low temperature effect on housekeeping and sucrose synthase genes expression in sugar beet
No full textAn integrated approach using advanced bioinformatics tools and targeted gene expression analysis was carried out to evaluate the potential use of seven “housekeeping” genes, commonly employed as internal controls in real-time PCR analysis. Adequate testing of reference gene consistency, is always necessary to validate data from any new experimental conditions, since a unique “housekeeping” suitable for every species, organ, developmental stage and treatment does not exist. Thus, the expression stability of glyceraldehyde-3-phosphate dehydrogenase, elongation factor 1_, actin 11, beta-6 tubulin, polyubiquitin 10, 18S rRNA and 5S rRNA genes were evaluated after exposure to low temperatures and in different organs of Beta vulgaris ssp. vulgaris plantlets. The cDNA sequences were derived from GenBank (NCBI) and TIGR-BvGI (Beta Vulgaris Gene Index), a platform providing high-fidelity tentative consensus (TC), obtained by a reliable and stringent ESTs analysis
Introduzione
No full text“L’uno è detto in molti modi”. Così inizia in medias res il breve trattato Sull’uno e sull’unità in cui al-Fārābī, sul modello di Aristotele in Metafisica Delta 6 e Iota 1 e 6, presenta una disamina linguistica della polisemia dei termini ‘uno’ e ‘molteplice’. La riflessione che vi presenta è cruciale per la comprensione non solo del pensiero logico del filosofo, ma anche della sua riflessione metafisica. Secondo al-Fārābī, infatti, soggetto primo della metafisica, intesa come scienza universale, è ciò che è comune a tutti gli enti: l’essere e l’uno e i loro contrari, il non-essere e la molteplicità. Unità ed essere, sono coestensivi, massimamente universali, e pericolosamente equivoci. Nel volume questo difficile e ingiustamente dimenticato trattato di al-Fārābī è rivisto criticamente, tradotto e commentato
Going Beyond Counting First Authors in Author Co-citation Analysis
Full text linkThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
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