Search results for "Senso"

Qualità e attitudine al consumo di frutti di papaya coltivati in serra in Sicilia

La papaya è una pianta erbacea diffusa nelle regioni tropicali e subtropicali e, nell’ultimo decennio, anche in Sicilia dove viene coltivata esclusivamente in serra. L’obiettivo del seguente lavoro è stato quello di valutare dal punto di vista qualitativo 5 varietà di papaya, originate da seme, coltivate in ambiente protetto. La raccolta dei frutti è stata effettuata utilizzando come indice di maturazione il colore dei frutti. Sono state effettuate analisi chimico-fisiche, sensoriali e un consumer test dei frutti utilizzando un questionario di gradimento. I risultati hanno evidenziato differenze significative in termini di qualità organolettica e sensoriale in una maniera cultivar dipendent…

Delayed filling of retinal and ciliary circulation after central retinal artery occlusion

1988

The filling times of the retinal and choroidal circulation were evaluated in 17 patients with central retinal artery occlusion by means of fluorescein angiography. A correlation between the filling times of the two circulations was found. However, two filling patterns were seen: first, both fillings delayed; second, both fillings normal. It is probable that in the former case an obstructive disease of the carotid arteries exists, while in the latter case an important pathology of the carotid arteries is lacking, favouring a rapid restoration of the retinal circulation. This hypothesis seems to be confirmed by the results of the Doppler velocimetry of the carotid arteries.

Role of IP3 Receptors in Shaping the Carotid Chemoreceptor Response to Hypoxia but not to Hypercapnia in the Rat Carotid Body: An Evidence Review

2021

This article addresses the disparity in the transduction pathways for hypoxic and hypercapnic stimuli in carotid body glomus cells. We investigated and reviewed the experimental evidence showing that the response to hypoxia, but not to hypercapnia, is mediated by 1,4,5-inositol triphosphate receptors (IP3R/s) regulating the intracellular calcium content [Ca2+]c in glomus cells. The rationale was based on the past observations that inhibition of oxidative phosphorylation leads to the explicit inhibition of the hypoxic chemoreflex. [Ca2+]c changes were measured using cellular Ca2+-sensitive fluorescent probes, and carotid sinus nerve (CSN) sensory discharge was recorded with bipolar electrode…

Coping with continual danger: assessing alertness to visual disturbances in crucian carp following long-term exposure to chemical alarm signals.

2013

Chemical alarm signals in fish are passively released into the water from ruptured epidermal cells, and induce instant fright responses in conspecifics. Fish also display alarm responses to injured heterospecific skin, as well as to scent of piscivorous predators that have ingested prey. A conspicuous alertness to visual disturbances has also been observed in fish following long-term exposure to extracts of filtered, homogenized skin, but the chemical inducers of such vigilance are actually unknown. We tested if a continual exposure to water-soluble alarm signals, from either conspecifics or heterospecifics, affects alertness of fish. Based on previous experience, it was assumed that alertn…

Understanding a Cartesian graph using the motion sensor

2008

This paper shows the experimental results of a didactical activity conducted using the motion sensor. This MBL-tool (Microcomputers-Based Laboratory) allows to study rectilinear motion of bodies moving in front of it. In a fixed time interval the motion sensor reveals the distance of bodies from it and transmits the measures to a computer that visualizes the data in tabular and Cartesian representations. This research corroborates several works about the use of MBL-tools, according to which the use of the motion sensor allows the students to read, understand and produce kinematics graphs. Moreover our analysis shows that the students acquire these competence respect to graphs of other type …

Influenza di lieviti diversi sulla composizione e sul profilo sensoriale di vini Catarratto

2013

Damming an electronic energy reservoir: ion-regulated electronic energy shuttling in a [2]rotaxane

2021

We demonstrate the first example of bidirectional reversible electronic energy transfer (REET) between the mechanically bonded components of a rotaxane. Our prototypical system was designed such that photoexcitation of a chromophore in the axle results in temporary storage of electronic energy in a quasi-isoenergetic “reservoir” chromophore in the macrocycle. Over time, the emissive state of the axle is repopulated from this reservoir, resulting in long-lived, delayed luminescence. Importantly, we show that cation binding in the cavity formed by the mechanical bond perturbs the axle chromophore energy levels, modulating the REET process, and ultimately providing a luminescence read-out of c…

Interaction of Neuronal Calcium Sensor-1 (NCS-1) with Phosphatidylinositol 4-Kinase β Stimulates Lipid Kinase Activity and Affects Membrane Trafficki…

2001

Phosphatidylinositol 4-kinases (PI4K) catalyze the first step in the synthesis of phosphatidylinositol 4,5-bisphosphate, an important lipid regulator of several cellular functions. Here we show that the Ca(2+)-binding protein, neuronal calcium sensor-1 (NCS-1), can physically associate with the type III PI4Kbeta with functional consequences affecting the kinase. Recombinant PI4Kbeta, but not its glutathione S-transferase-fused form, showed enhanced PI kinase activity when incubated with recombinant NCS-1, but only if the latter was myristoylated. Similarly, in vitro translated NCS-1, but not its myristoylation-defective mutant, was found associated with recombinant- or in vitro translated P…

Induction of apoptosis by arachidonic acid in human retinoblastoma Y79 cells: involvement of oxidative stress

2000

Arachidonic acid administration caused apoptosis in Y79 cells, as shown by typical morphological changes, phosphatidylserine externalization, chromatin condensation, processing and activation of caspase-3 and cleavage of the endogenous caspase substrate poly-(ADP-ribose)-polymerase. Arachidonic acid also caused lamin B cleavage, suggesting caspase-6 activation. Arachidonic acid treatment was accompanied by increased formation of the lipid peroxidation end products malondialdehyde and 4-hydroxy-2-nonenal, lowering in reduced glutathione content and in mitochondrial membrane potential. Inhibiting glutathione synthesis sensitized Y79 cells to apoptosis-inducing stimuli, whilst replenishing red…

Characteristic ERK1/2 signaling dynamics distinguishes necroptosis from apoptosis

2021

International audience; ERK1/2 involvement in cell death remains unclear, although many studies have demonstrated the importance of ERK1/2 dynamics in determining cellular re- sponses. To untangle how ERK1/2 contributes to two cell death programs, we investigated ERK1/2 signaling dynamics during hFasL-induced apoptosis and TNF-induced necroptosis in L929 cells. We observed that ERK1/2 inhibition sensi- tizes cells to apoptosis while delaying necroptosis. By monitoring ERK1/2 activity by live-cell imaging using an improved ERK1/2 biosensor (EKAR4.0), we reported differential ERK1/2 signaling dynamics between cell survival, apoptosis, and nec- roptosis. We also decrypted a temporally shifted …