Academic literature on the topic 'Stima glucosio'

Five flavones glycosides (i.e., 2''-O-α-l-rhamnosyl-6-C-3''deoxyglucosyl-3'-methoxyluteolin, ax-5'-methane-3'-methoxymaysin, ax-4''-OH-3'-methoxymaysin, 6,4'-dihydroxy-3'-methoxyflavone-7-O-glucoside, and 7,4'-dihydroxy-3’-methoxyflavone-2''-O-α-l-rhamnosyl-6-C-fucoside) were successfully isolated from corn silk and identified. We evaluated their antioxidant activity among in vitro assay systems. Most of the flavones glycosides showed a high antioxidant activity in a lecithin liposome system, as well as a strong scavenging activity against radicals such as 1,1-diphenyl-2-picrylhydrazyl (DPPH), superoxide, and hydroxyl radicals. The study indicated that the corn silk flavonoids, especially 6, 4'-dihydroxy- 3'-methoxyflavone-7-O-glucoside, may be beneficial natural food antioxidants.  

The features of accumulation of rutin and apigenin-7-O-glucoside and their distribution in the aboveground organs of Alyssum lenense Adams (Brassicaceae Burnett) were revealed. The content of photosynthetic pigments was investigated depending on the phytocenotic conditions of plant growth in the territory of Central Yakutia. The data obtained on the content of flavonoids are characterized by an uneven distribution over organs with respect to different phytocenotic conditions of the growth of cenopopulations. A. lenense was collected during flowering period in 8 cenopopulations and in the collection of the Yakutsk Botanical Garden. The distribution of rutin content over the aboveground organs of A. lenense was directed: flowers → leaves → stem and depended on the altitude of the population growth, shading, and phytocenosis. The distribution pattern of apigenin-7-O-glucoside corresponded to the scheme: flowers / = leaves → stem and depended on phytocenotic growing conditions. It was revealed that rutin in flowers is higher than apigenin-7-O-glucoside under the conditions of introduction and in the Veronica incana-Festuca lenensis-Stipa capillata grass steppe; in the plants of the other studied cenopopulations, the ratio was inverse. The same amount of flavonoids in flowers was observed in A. lenense, growing in Pulsatilla flavescens steppe and Artemisia commutata steppe. In most of the studied cenopopulations, the content of apigenin-7-O-glucoside in leaves and stems was higher than rutin, with the exception of populations growing in a dry pine forest, at the edge of a pine forest, and in leaves - only in plants on an artificial slope at the initial stage overgrowth. Phytocenotic growing conditions affect the amount of pigments in the leaves of A. lenense: the largest amount was recorded in the population growing in a dry pine forest, and the smallest in Artemisia frigida steppe and Artemisia commutata steppe.

In questo elaborato di tesi è stato trattato l’effetto fotoacustico spiegandone le proprietà e le caratteristiche grazie alle quali è possibile svolgere alcune analisi specifiche nell’ambito biomedico. Fra i vari utilizzi che l’effetto fotoacustico offre, si è voluto studiare e approfondire quello che permette di stimare il livello di glucosio nel sangue. Tale tecnologia, seppur ancora in via di sviluppo, potrebbe fornire in futuro la possibilità di monitorare la glicemia di pazienti affetti da diabete. Nel presente lavoro è stata evidenziata la componente ingegneristica e tecnica che riguarda i sistemi fotoacustici, viene spiegato il set-up ovvero quali sono gli elementi che lo compongono il sistema e a seguire quali sono le caratteristiche richieste dall’utilizzatore al fine di avere una stima il più precisa ed accurata possibile. Dai vari esperimenti e progetti presenti in letteratura scientifica, sono stati estrapolati e confrontati alcuni parametri fondamentali da cui la sorgente ottica è caratterizzata, quali la lunghezza d’onda, la frequenza e la durata dell’impulso. Sono stati descritti sia il procedimento di analisi attuato grazie a questo fenomeno sia le tipologie di materiale biologico su cui si può applicare. Infine l’elaborato termina con una discussione riguardo i risultati ottenuti dai vari esperimenti e progetti presi in considerazione, con annessi vantaggi e svantaggi che sono emersi nei vari lavori.