Understanding taste is key for optimizing the palatability of seaweeds and other non-animal-based foods rich in protein. The lingual papillae in the mouth hold taste buds with taste receptors for the five gustatory taste qualities. Each taste bud contains three distinct cell types, of which Type II cells carry various G protein-coupled receptors that can detect sweet, bitter, or umami tastants, while type III cells detect sour, and likely salty stimuli. Upon ligand binding, receptor-linked intracellular heterotrimeric G proteins initiate a cascade of downstream events which activate the afferent nerve fibers for taste perception in the brain. The taste of amino acids depends on the hydrophobicity, size, charge, isoelectric point, chirality of the alpha carbon, and the functional groups on their side chains. The principal umami ingredient monosodium l-glutamate, broadly known as MSG, loses umami taste upon acetylation, esterification, or methylation, but is able to form flat configurations that bind well to the umami taste receptor. Ribonucleotides such as guanosine monophosphate and inosine monophosphate strongly enhance umami taste when l-glutamate is present. Ribonucleotides bind to the outer section of the venus flytrap domain of the receptor dimer and stabilize the closed conformation. Concentrations of glutamate, aspartate, arginate, and other compounds in food products may enhance saltiness and overall flavor. Umami ingredients may help to reduce the consumption of salts and fats in the general population and increase food consumption in the elderly.
MULTIFILE
As a practitioner, a manager and a scientist in social work for 40 years, I am still intrigued by the social work positioning and legitimating processes. Its recognition by users and financiers is often diffuse and its fragmentation sometimes hinders effective interventions. In social work itself, we see a range of positioning processes, most of them either legitimating social work as a promoter of social justice, a supporter of emancipation and anti-oppressive practice, or positioning social work as a therapeutic approach, treating people with socio-psychological and psychiatric disorders. Social work is often promoted as a ‘real’ profession, in need of formal recognition and in need of a precise profile. In this article it will be argued that the core of social work is about supporting people in their social functioning and should position itself in the centre of the post-modern quest: the social-psychological disorientation, the lack of meaning, and the problems of isolation and exclusion. Modern professionalism is not about demarcating and regulating but much more about ‘Entgrenzung’ and openness.
DOCUMENT
Er bestaat een nauwe samenhang tussen de smaak- en de reukperceptie.De smaakperceptie vindt plaats door smaakpapillen die zout, zuur, zoet, bitter en umami kunnen onderscheiden. Daarnaast kunnen 2.000-4.000 verschillende geuren worden herkend. Veel smaakstoornissen zijn in feite reukstoornissen. Speeksel beïnvloedt de smaakperceptie omdat het fungeert als oplosmiddel voor de smaakstoffen en omdat het de smaakreceptoren beschermt. Daarom leidt een vermindering van de speekselproductie gewoonlijk tot afname van de smaakperceptie, waarbij de concentratie van zinkionen en specifieke eiwitten in speeksel een belangrijke rol spelen. Ook zink- en ijzerdeficiëntie kunnen leiden tot verminderde smaak- en reukperceptie.
LINK
