Search results for "LDA"

Evolution, ecology and systematics of Soldanella (Primulaceae) in the southern Apennines (Italy)

2015

Background The populations of Soldanella (Primulaceae) of the southern Apennines (Italy) are unique within the genus for their distribution and ecology. Their highly fragmented distribution range, with three main metapopulations on some of the highest mountains (Gelbison, Sila and Aspromonte massifs) of the area, poses intriguing questions about their evolutionary history and biogeography, and about the possibility of local endemisms. Aims and methods In order to clarify the phylogeny and biogeography of the three metapopulations of Soldanella in the southern Apennines, attributed to S. calabrella to date, and to identify possible local endemisms, a comparative approach based on the study o…

The systematics of Soldanella (Primulaceae) based on morphological and molecular (ITS, AFLPs) evidence

2002

Based on the observation of more than 6300 herbarium specimens and molecular (ITS, AFLPs) evidence, Soldanella is divided into 16 species and four subspecies. Soldanella angusta, S. oreodoxa and S. rugosa are described as new, and the circumscriptions of S. marmarossiensis, S. major, S. pusilla ssp. pusilla and S. hungarica are emended. Nine hybrid names are lectotypified. All non-hybrid taxa are described in detail and distribution maps are provided. Interspecific relationships are discussed on the background of morphological and molecular variation.

Inclusión de Tecnologías de la Información y Comunicación en la formación estadística

2011

Tomando en cuenta las dificultades que manifiestan los alumnos para comprender la concepción de modelos estadísticos, en un curso de grado de Probabilidad y Estadística para Ingeniería se planteó la incorporación de recursos didácticos con soporte tecnológico. Para favorecer la interacción se creó un grupo en la plataforma Google donde participaron libremente alumnos y docentes. Paralelamente se diseñó una secuencia didáctica referida a variables aleatorias, con soporte en la planilla Excel. Ambas propuestas fueron evaluadas en forma cualitativa y cuantitativa mediante registros de clases y encuestas a los alumnos. Los resultados permitieron identificar debilidades y fortalezas así como ref…

Manifiesto que hace... Fr. Geronimo Vilar, monge cisterciense, Presidente mayor de la Real Casa de S. Vicente de la Roqueta ... y Mayoral de las Pobl…

1745

Port. orlada Escut calc. del Monestir de Poblet a la port. Caplletra ornada al començament del text Sign.: [ ]1, A-G2, I1 Text amb postil·les marginals Reclams

Letter on the election of Ernesto Foldats as a member of The Linnean Society of London

1993

Letter on the election of Ernesto Foldats as a member of The Linnean Society of London, stating that, subject to the conditions, Ernesto Foldat must attend a meeting of the society for official admission within six months of the election, but an extension is possible. A member is not entitled to vote at any meeting of the Society until an official admission has taken place. Letter on 1 page, signature of the executive secretary of the society at the bottom. Stored in the Museum of the University of Latvia Botanical and Mycological collections.

Quaternary diversification in European alpine plants: pattern and process

2004

Molecular clock approaches applied previously to European alpine plants suggest that Primula sect. Auricula , Gentiana sect. Ciminalis and Soldanella diversified at the beginning of the Quaternary or well within this period, whereas Globularia had already started diversifying in the (Late–)Tertiary. In the first part of this paper we present evidence that, in contrast to Globularia and Soldanella , the branching patterns of the molecular internal transcribed spacer phylogenies of both Primula and Gentiana are incompatible with a constant–rates birth–death model. In both of these last two taxa, speciation probably decreased through Quaternary times, perhaps because of some niche–filling pro…

Determination of the cultivar and aging of Sicilian olive oils using HPLC-MS and linear discriminant analysis

2010

A large number of certified samples (84) of Sicilian olive oils arising from the eight cultivars most represented in Sicily (Biancolilla, Cerasuola, Moresca, Nocellara del Belice, Nocellara Etnea, Oglialora Messinese, Brandofino and Tonda Iblea) have been collected and analyzed by HPLC/MS using an atmospheric pressure chemical ionization (APCI) source. The sample preparation is very simple; in fact, the oil samples are diluted without any chemical derivatization. A following statistical data treatment by general discriminant analysis (GDA) allows the determination of the olive oil cultivar. Furthermore, changes in the composition of glyceridic components of the olive oils lead to easy discr…

Colònia alvernesa a Cocentaina als segles XVII y XVIII

2021

Más allá del 'sí' y del 'no'

2005

Divergent route to the preparation of hybrid Pt–Fe 2,4,6-Tris(4-ethynyl)phenyl-1,3,5-triazine metallodendrimers for nonlinear optics

2013

Abstract: The synthesis strategy for the preparation of novel platinum acetylide homometallic and heterobimetallic dendrimers (containing Fe as the other metal fragment) based on a 2,4,6-tris(4-ethynyl)phenyl-1,3,5-triazine core (3) is reported. All the dendrimer generations (G0G2) were synthesized under copper-free conditions following a divergent route. The G0-Pt dendrimer (4) was synthesized using the 1,3,5-triazine core (3) and cis-[Pt(PEt3)2Cl2] with a molar ratio of 1/4. The advantage of the current method is that different dendrimers can be prepared by following the same procedure with only changes in the molar ratios of the reactants involved. For instance, when 3 reacts with 4 in a…