Search results for "MCP"
showing 10 items of 42 documents
A comparison of the effects of ?-ketotriazole, MCPA and carbaryl on the plasma membrane Mg2+-ATPase activity and lipid composition of rice shoots (Or…
1993
The effect of γ-ketotriazole, MCPA and carbaryl on the lipid composition and ATPase activity associated with plasma membrane fractions from rice (Oryza sativa cv Bahia) shoots was investigated. With γ-ketotriazole and MCPA treatments the relative amount of δ5-avenasterol (%) was reduced in the plasma membrane, whereas with γ-ketotriazole a reduction was also found in the sitosterol content, expressed as a percentage of the total free sterol composition. The fatty acyl chain length of phosphatidylcholine fractions from MCPA-treated plants was also reduced. The plasma membrane Mg2+-ATPase activity was only stimulated in MCPA-treated plants. No changes were observed in lipid composition or ATP…
Adaptive P-splines via L1-type penalty in generalized additive models
2022
Frigoconservazione ed edible coating per la conservazione post-raccolta dei frutti della pesca Settembrina
2018
Da quanto emerso dai dati strumentali, l’applicazione del rivestimento a base di Aloe sui frutti di pesca “Settembrina”, sia in maniera singola che congiunta con 1 MCP, consente di rallentare i processi metabolici, permettendo, quindi, il mantenimento del colore dei frutti nel tempo e prevenendo la degradazione di tutti i composti nutrizionali e bioattivi utili a conferire al frutto serbevolezza e pregevoli caratteristiche organolettiche. Quanto riscontrato, si potrebbe tradurre in un vantaggio per il produttore che, usufruendo di una tecnologia semplice ed ecosostenibile dal punto di vista ambientale, potrebbe offrire al consumatore frutti dalla elevata shelf life con elevati standard qual…
Development and application of a new Edible Coating on fruits and fresh-cut fruits.
2014
Il progetto di ricerca ha come scopo il miglioramento della gestione post-raccolta dei frutti (interi e di IV gamma), intervenendo sull’estensione della shelf-life; valutando l’utilizzo di composti provenienti da materiali di scarto delle filiere produttive agroalimentari o risorse alternative da utilizzare come nuovi rivestimenti commestibili (edible coating: EC). La novità riguarda lo sviluppo di un edible coating a partire da residui vegetali di Posidonia oceanica, pianta acquatica mediterranea ampiamente diffusa sulle coste siciliane, responsabile di accumulo di biomassa sulle spiagge. Per soddisfare, in maniera efficace, l’obiettivo iniziale si vorrebbe creare una interazione tra 1-MCP…
Model selection in linear mixed-effect models
2019
Linear mixed-effects models are a class of models widely used for analyzing different types of data: longitudinal, clustered and panel data. Many fields, in which a statistical methodology is required, involve the employment of linear mixed models, such as biology, chemistry, medicine, finance and so forth. One of the most important processes, in a statistical analysis, is given by model selection. Hence, since there are a large number of linear mixed model selection procedures available in the literature, a pressing issue is how to identify the best approach to adopt in a specific case. We outline mainly all approaches focusing on the part of the model subject to selection (fixed and/or ra…
Regulation of bacterial and fungal MCPA degradation at the soil–litter interface
2010
Abstract Much is known about mechanisms and regulation of phenoxy acid herbicide degradation at the organism level, whereas the effects of environmental factors on the performance of the phenoxy acid degrading communities in soils are much less clear. In a microcosm experiment we investigated the small-scale effect of litter addition on the functioning of the MCPA degrading communities. 14 C labelled MCPA was applied and the functional genes tfdA and tfdAα were quantified to characterise bacterial MCPA degradation. We identify the transport of litter compounds as an important process that probably regulates the activity of the MCPA degrading community at the soil–litter interface. Two possi…
Variable selection with unbiased estimation: the CDF penalty
2022
We propose a new SCAD-type penalty in general regression models. The new penalty can be considered a competitor of the LASSO, SCAD or MCP penalties, as it guarantees sparse variable selection, i.e., null regression coefficient estimates, while attenuating bias for the non-null estimates. In this work, the method is discussed, and some comparisons are presented.
Variable Selection with Quasi-Unbiased Estimation: the CDF Penalty
2022
We propose a new non-convex penalty in linear regression models. The new penalty function can be considered a competitor of the LASSO, SCAD or MCP penalties, as it guarantees sparse variable selection while reducing bias for the non-null estimates. We introduce the methodology and present some comparisons among different approaches.
Design of an Herbal Preparation Composed by a Combination of Ruscus aculeatus L. and Vitis vinifera L. Extracts, Magnolol and Diosmetin to Address Ch…
2023
Chronic venous disease (CVD) is an often underestimated inflammatory pathological condition that can have a serious impact on quality of life. Many therapies have been proposed to deal with CVD, but unfortunately the symptoms recur with increasing frequency and intensity as soon as treatments are stopped. Previous studies have shown that the common inflammatory transcription factor AP-1 (activator protein-1) and nuclear factor kappa-activated B-cell light chain enhancer (NF-kB) play key roles in the initiation and progression of this vascular dysfunction. The aim of this research was to develop a herbal product that acts simultaneously on different aspects of CVD-related inflammation. Based…
Performance of the cost-effective Planacon ® MCP-PMTs in strong magnetic fields
2020
We present the behavior of the cost-effective Planacon MCP-PMTs with pore diameter in the presence of axial magnetic fields up to 0.5 T. Having a batch of 62 devices of the same type, two MCP-PMTs were selected and their gain variation measured in different magnetic fields. These two otherwise identical devices satisfied the selection criteria by requiring the lowest (1.15 kV) and one of the highest (1.4 kV) bias voltage values to achieve a given gain. Both MCP-PMTs have a nearly identical tolerance of the strong magnetic field despite the significant difference in the bias voltage. This clarifies the mechanism of the B-field influence on the MCP-PMT gain, emphasizing the importance of the …