Search results for "shoot"
showing 10 items of 298 documents
Use of carbon dioxide enrichment to obtain adult morphology of grapevinein vitro
1993
A procedure has been developed forin vitro propagation ofVitis vinifera ‘Pinot noir’ from lateral-bud cuttings under high CO2 concentration (1200 µmol mol−1). Because of inhibition of rooting by CO2, this procedure requires a rooting pre-culture of explants on medium with sucrose before the CO2-enriched culture on sucrose-free medium. Shoot growth was enhanced by CO2 enrichment as a result of both a higher rate of leaf production and greater internode elongation. Leaf expansion and tendril growth were promoted and better rooting was obtained. The more significant effect of CO2 enrichment was to promote adult morphology with, in particular, the tendril pattern. Thus, for the first time, grap…
In vitro shoot organogenesis from excised immature cotyledons and microcuttings production in Stone Pine
1994
Adventitious buds were induced on isolated immature cotyledons of Pinus pinea L. in the presence of benzyladenine (BA). The response to different BA concentrations also depended upon the culture medium used (modified MS, SH and GD). A wide range of BA concentrations (5, 25 or 50 μM) can be applied to the GD and SH media, which are the media with the lower nitrogen content, without damaging effects. In the MS medium, which has the highest nitrogen concentration, the range of BA that can be applied was narrower and the highest BA concentration was lethal. The addition of indolebutyric acid (0.05, 0.25 or 0.5 μM) to the induction medium, decreased the response of cotyledons. The increase in th…
Degrowth, the past, the future, and the human nature
2012
Abstract In the last years, different sources point to a same message: industrial civilization has entered an overshoot mode, the natural limits to growth have been already surpassed. This frontier does not wait for us in the future; it already belongs to our past. If population and the economy are truly beyond the limits, then current visions and theories of social change would be deeply perturbed. If the development era is approaching its end, then many sociological theories on current societies will share the same destiny, sustainable development doctrines between them. It is worth to examine theories that explicitly look at the social world this way or that – at least – are not incompat…
Design of temperature control system using conventional PID and Intelligent Fuzzy Logic controller
2015
In this paper, we present the design of temperature control for industrial heat treating furnace by using Intelligent Fuzzy Logic and PID controllers. Temperature control is important in heating processes as it can disqualify materials in terms of their physical properties when not well performed. Obviously PID temperature controller is the most used in industries to control non-linear processes. Consequently, it has been found that the output response from Fuzzy Logic is very accurate in terms of overshoot and steady state error when compared to that of PID. Moreover, both temperature controllers are modeled and simulated using MATLAB software.
nalysis, Modeling and Simulation of Mechatronic Systems using the Bond Graph Method
2011
The Bond Graph is the proper choice of physical system used for: (i) Modeling which can be applied to systems combining multidisciplinary energy domains, (ii) Analysis to provide a great value proposition for finding the algebraic loops within the system enabling the process of troubleshooting and eliminating the defects by using the proper component(s) to fix the causality conflict even without being acquainted in the proper system, and (iii) Simulation facilitated through derived state space equations from the Bond Graph model is solved using industrial simulation software, such as 20-Sim. The Bond Graph technique is a graphical language of modeling, in which component energy ports are co…
Thermoconvective instability and local thermal non-equilibrium in a porous layer with isoflux-isothermal boundary conditions
2014
The effects of lack of local thermal equilibrium between the solid phase and the fluid phase are taken into account for the convective stability analysis of a horizontal porous layer. The layer is bounded by a pair of plane parallel walls which are impermeable and such that the lower wall is subject to a uniform flux heating, while the upper wall is isothermal. The local thermal non-equilibrium is modelled through a two-temperature formulation of the energy exchange between the phases, resulting in a pair of local energy balance equations: one for each phase. Small-amplitude disturbances of the basic rest state are envisaged to test the stability. Then, the standard normal mode procedure is…
Is rootstock-induced dwarfing in olive an effect of reduced plant hydraulic efficiency?
2006
We investigated the hydraulic architecture of young olive trees either self-rooted or grafted on rootstocks with contrasting size-controlling potential. Clones of Olea europea L. (Olive) cv ''Leccino'' inducing vigorous scion growth (Leccino ''Minerva'', LM) or scion dwarfing (Leccino ''Dwarf'', LD) were studied in different scion/rootstock combinations (LD, LM, LD/LD, LM/LM, LD/LM and LM/LD). Shoots growing on LD root systems developed about 50% less leaf surface area than shoots growing on LM root systems. Root systems accounted for 60-70% of plant hydraulic resistance (R), whereas hydraulic resistance of the graft union was negligible. Hydraulic conductance (K = 1/R) of LD root systems w…
Regeneration of Sideritis angustifolia (Labiatae) Plants from Single Cell Cultures
1988
Summary Mechanically isolated cells from hypocotyl-derived calli of Sideritis angustifolia Lag. were inoculated on agar-solidified Murashige and Skoog (MS) nutrient medium containing CH and different concentrations and combinations of NAA and BA. Isolated cells underwent continued divisions giving rise to calli after 30 days of culture. Best results were obtained when medium was supplemented with 0.5 μM NAA and 4.4 or 8.8 μM BA or with 5 μM NAA and 4.4μM BA. Calli obtained in the presence of 0.5 μM NAA and 8.8 μM BA regenerated shoot-buds when transferred to MS medium without CH and supplemented or not with these growth regulators. Once shoots were excised, the calli maintained their morpho…
An Innovative Soil Bioengineering Technique by Waste Materials: The RiVite Project
2023
This paper describes the RiVite project granted by the Italian Ministry of Economic Development according to the JUMP (Joint Universities Program for PoC) program for patents enhancement, proposed by Sant’Anna School, Scuola Normale and the University of Palermo. The patent (Calvo, R., D’Asaro, F., Baiamonte, G.: Metodo per la realizzazione di un’opera costruttiva modulare per la protezione del territorio e detta opera. Attestato di Brevetto per Invenzione Industriale, n° 102,017,000,141,369, Ministero dello Sviluppo Economico, Roma, 27/02/2020.) consists of an advanced soil bioengineering work providing anti-erosion function, consolidating and stabilizing of slopes, thus for land protectio…
Nitrogen Distribution in Annual Growth of ‘Italia’ Table Grape Vines
2018
Little information is available about either nitrogen (N) content/concentration in table grape vines. The knowledge about N accumulated by the vine organs during the season could support sustainable fertilization programs for table grape vineyards. The aim of the present paper was to investigate the N content in different annual organs, in summer and winter pruning materials, clusters at harvest and fallen leaves at post-harvest of table grape vines in order to verify the vine annual N requirements to be used for sustainable N fertilization schedules. Biomass and nitrogen were analyzed at six phenological growth stages (flowering, berry-set, berry growth, veraison, ripening, and harvest) fr…