Search results for "Flore"
showing 10 items of 153 documents
Testing the ontogenetic base for the transient model of inflorescence development
2013
† Backgrounds and Aims: Current research in plant science has concentrated on revealing ontogenetic processes of key attributes in plant evolution. One recently discussed model is the ‘transient model’ successful in explaining some types of inflorescence architectures based on two main principles: the decline of the so called ‘vegetativeness’ (veg) factor and the transient nature of apical meristems in developing inflorescences. This study examines whether both principles find a concrete ontogenetic correlate in inflorescence development. † Methods: To test the ontogenetic base of veg decline and the transient character of apical meristems the ontogeny of meristematic size in developing inf…
Forced Flowering in Mandarin Trees Under Phytotron Conditions
2019
[EN] Phytotron has been widely used to assess the effect of numerous parameters on the development of many species. However, less information is available on how to achieve fast profuse flowering in young fruit trees with this plant growth chamber. This study aimed to outline the design and performance of a fast clear methodology to force flowering in young mandarin trees (cv. Nova and cv. Clemenules) and to analyze the influence of induction intensity on inflorescence type. The combination of a short water stress period with simulated spring conditions (day 13 h, 22 °C, night 11 h, 12 °C) in the phytotron allowed flowers to be obtained only after 68-72 days from the time the experiment beg…
Low fruit set in a dioecious tree: pollination ecology of Commiphora harveyi in South Africa
2005
Dioecious plant species differ in floral morphology and rewards between females and males. Pistillate flowers on female plants often lack pollen and can be less attractive to pollinators, which can have consequences for the visitation rates of the sexes. We studied the pollination ecology of the dioecious tree Commiphora harveyi in a coastal scarp forest in eastern South Africa. Floral display, visiting insect species, visitation rate and natural fruit set were recorded. Additionally, we pollinated flowers by hand to determine experimental fruit set. We found that male trees had more and larger flowers per inflorescence than female trees. Both sexes produced nectar in low amounts. During 20…
Analysis of Phenolic Compounds in Commercial Cannabis sativa L. Inflorescences Using UHPLC-Q-Orbitrap HRMS
2020
Industrial hemp (Cannabis sativa L. Family Cannabaceae) contains a vast number of bioactive relevant compounds, namely polyphenols including flavonoids, phenolic acids, phenol amides, and lignanamides, well known for their therapeutic properties. Nowadays, many polyphenols-containing products made of herbal extracts are marketed, claiming to exert health-promoting effects. In this context, industrial hemp inflorescence may represent an innovative source of bioactive compounds to be used in nutraceutical formulations. The aim of this work was to provide a comprehensive analysis of the polyphenolic fraction contained in polar extracts of four different commercial cultivars (Kompoti, Tiborszal…
The Political Logic of Conflict. A Debate on Machiavelli in Tumult by Gabriele Pedullà. Introduction
2021
This section of the issue offers a debate on G. Pedullà’s Machiavelli in Tumult: The Discourses on Livy and the Origins of Political Conflictualism (Cambridge 2018). Its ambition is to bring together textual and philological analysis that is «internal» to the great fabric of Machiavellian exegesis, alongside theoretical-political questioning «external» to that fabric. The main objective is to offer a new image of Machiavelli as an author who breaks with a long and authoritative tradition, one which exalted concord as an absolute political value, and to inaugurate a new way of observing political and social phenomena. The book is discussed by A. Brown, J. Hankins, J. Mc-Cormick, and N. Urbin…
Pollination ecology of the dioecious tree Commiphora guillauminii in Madagascar
2004
In dioecious plant species differences in morphology and resources between female and male flowers can have consequences for flower visitation rates. Female flowers sometimes lack pollen and can be less attractive to pollinators than male flowers. We studied the pollination ecology of the dioecious tree Commiphora guillauminii in a dry deciduous forest in western Madagascar. We recorded floral display, visiting insect species and visitation rates for female and male trees. The results showed that female trees produce significantly larger but fewer flowers per inflorescence than male ones. Number of flowers per tree did not differ between the sexes. During 270 observation-hours we observed 1…
Characterization of an Italian biotype of clary sage (Salvia sclarea L.) grown in a semi-arid Mediterranean environment
2002
An Italian spontaneous biotype of clary sage (Salvia sclarea L.) was evaluated for its suitability to be cultivated in a semi-arid area and for the influence of these growth conditions on the essential oil composition. Seeds gathered from a spontaneous biotype were sown directly in the field, using a seeding density calculated to achieve a plant population of 7 plants/m2. Essential oils from the inflorescences and leaves of plants harvested at full flowering and early seed ripeness stages were obtained by steam distillation and characterized by GC and GC–MS. The plants showed a good tolerance to the semi-arid growth conditions, yielding more than 700 flowers/plant and about 21 g seeds/plant…
Suivi Botanique de l’Archipel de Zembra
2013
Une mission scientifique a été réalisée sur l’archipel de Zembra du 9 au 15 Mai 2013. Les principaux objectifs fixés pour cette mission étaient les suivant: - améliorer les connaissances générales de la flore et de la végétation sur l’archipel, - réaliser un nouvel inventaire de la végétation à partir des placettes délimitées suite à la dératisation de 2010 sur Zembretta afin d’évaluer le sens d’évolution de la végétation, - le suivi de la végétation sur ces placettes, réalisé dans le cadre des ″Iles Sentinelles en Méditerranée″ dont l’archipel de Zembra en fait partie, - améliorer la connaissance des groupements végétaux et des habitats de l’île tout en prenant en compte les habitats favor…
Potentially harmfull elements accumulation in fumarolic alteration products at three hydrothermal systems of Greece
2018
Samples of efflorescences and encrustations of hydrothermal origin have been collected at three fumarolic areas in Greece. The three sites are Sousaki, Thiafi (Methana) and Kokkino Nero (Kos) and all belong to the South Aegean Active Volcanic Arc. Samples were analysed for their mineralogical (XRD and SEM-EDS) and chemical composition. Solutions obtained from both mineralization with HNO3 and leaching with distilled water, were analysed for major (ICP-OES), minor and trace metals (ICP-MS) and for sulfate contents (IC). Results show that their composition is mainly controlled by the petrological composition of the substrate (ultramafic rocks at Sousaki, felsic volcanic rocks at Methana and l…
El contexto italiano en la experiencia didáctica entre proyecto, paisaje y territorio.
2017
La experiencia de la didáctica italiana que se describe en este libro está enfocada sobre todo en el trabajo que se hace en la Escuela Politécnica de la Universidad de Palermo, con la participación de unos compañeros que enseñan a la Universidad de Brescia de Roma, de Génova y de Florencia. Las contribuciones que se publican aquí están dirigidas a diferentes áreas de conocimiento, pero todas están dirigidas a los temas de territorio y sus transformaciones, paisaje y proyecto. Las experiencias que los docentes cuentan la experiencia de actividades desarrolladas todas en talleres teóricos/prácticos, donde el estudiante de la carrera de Urbanismo y de Arquitectura enfrentan muchas de la activi…