Search results for "odor"
showing 10 items of 569 documents
The Off-Flavor of Pea Flour
2014
Pea products are underused as a protein source in human food because of their “beany” flavor. The objective of the study is to select an extraction method being the most representative for the sensory perception of the beany flavor. Solid phase microextraction (SPME) and purge and trap (P&T) extracts were analyzed by GC-MS and the sensory representation of the extracts was assessed by direct gas chromatography-olfactometry (D-GC-O). Extracted compounds were less numerous in SPME extracts than in P&T extracts. Nevertheless, the SPME method was more suitable because of its good representation of the pea suspension odor.
Study of the effect of H2S, MeSH and DMS on the sensory profile of wine model solutions by Rate-All-That-Apply (RATA)
2016
The effect of hydrogen sulfide (HS), methanethiol (MeSH) and dimethyl sulfide (DMS) on the odor properties of three wine models-WM- (young white, young red and oaked red wines) was studied. Wine models were built by mixing a pool of common wine volatile and non-volatile compounds and further spiked with eight different combinations of the three sulfur compounds present at two levels (level 0: 0 μg L and level 1: 40 μg L of HS, 12 μg L of MeSH; 55 μg L of DMS). For each wine matrix eight WMs were produced and further submitted to sensory description by Rate-All-That-Apply (RATA) method. Hydrogen sulfide and methanethiol were clearly involved in the formation of reductive aromas and shared th…
Indivīda brīvības problemātika Dostojevska romānā "Velni" un Kamī lugā "Velni"
2018
Bakalaura darbā tiek apskatīta eksistenciālās filosofijas izpratne un problemātika par indivīda brīvību Dostojevska romānā “Velni” un Kamī lugā “Velni”. Tuvāk tiks aplūkota Dostojevska romāna noformējuma nozīme, brīvības negatīvā puse, idejas, kas pakļauj indivīdu un nihilistiskais tēlu skatījums uz dzīvi. Darba mērķis ir izpētīt abu autoru uzskatus par indivīdu un tā brīvību, un skatīt to problemātiskos aspektus caur tēliem darbos “Velni”. Lai sasniegtu mērķi, tiek izvirzīti trīs uzdevumi. Pirmkārt, Dostojevska un Kamī tekstu izpēte, lai iepazītos ar darbu pamatproblēmām. Otrkārt, sekundārās literatūras analizēšana, lai izprastu, kā tiek interpretēta abu autoru filosofiskā doma. Treškārt, …
Headspace Volatile Composition of the Flowers of Caralluma europaea N.E.Br. (Apocynaceae)
2009
The volatile constituents of the flowers of Caralluma (Apteranthes) europaea (Guss.) N.E. Br. (Apocynaceae - Asclepiadoideae) from Lampedusa Island were analyzed by headspace method. The analyses allowed the identification and quantification of 41 compounds. The main components were, among the monoterpenoids, terpinolene (23.3%), a-terpinene (19.1%) and linalool (18.4%), whereas, among the carbonylic compounds the major constituents were heptanal (2.0%), octanoic acid (2.4%) and hexanoic acid (1.7%). It is worth to mention the presence of a nitrogen containing compound, indole (0.8%) and of a sulphur containing compound, dimethylsulphide (t). The compounds found in the flowers of C. europea…
Functional characterization of two human olfactory receptors expressed in the baculovirus Sf9 insect cell system
2005
Olfactory receptors (ORs) are the largest member of the G-protein-coupled receptors which mediate early olfactory perception in discriminating among thousands of odorant molecules. Assigning odorous ligands to ORs is a prerequisite to gaining an understanding of the mechanisms of odorant recognition. The functional expression of ORs represents a critical step in addressing this issue. Due to limitations in heterologous expression, very few mammal ORs have been characterized, and so far only one is from human origin. Consequently, OR function still remains poorly understood, especially in humans, whose genome encodes a restricted chemosensory repertoire compared with most mammal species. In …
Telpas semantika Teodora Fontānes romānā „Efija Brīsta”
2020
Telpa – viena no svarīgākajām kategorijām cilvēka pasaules uztverē. Ikdienišķā telpas definīcija nav problemātiska, atšķirībā no tās teorētiskās eksplikācijas jeb paskaidrojuma. Līdz par 20. gadsimtam telpas definīcija nebija pietiekami izpētīta, tomēr ar telpiskā pagrieziena (Spatial Turn) sākumu situācija ir mainījusies – telpa kļuva par kultūras vērtību, kas vēlāk ļāva paplašināt tās pētījuma horizontus. Pēdējo gadsimtu gaitā telpas izpētei tika veltīti daudzi darbi, kas pierāda tās aktualitāti līdz pat šodienai. Šis maģistra darbs nodarbojas ar literārās telpas semantiku jeb tās nozīmi un izpratni vācu rakstnieka Teodora Fontānes romānā Efija Brīsta. Šis romāns ir raksturīgs piemērs, ku…
Fruit quality and volatile fraction of ‘Pink Lady’ apple trees in response to rootstock vigor and partial rootzone drying
2008
BACKGROUND: Partial rootzone drying (PRD) is a novel deficit irrigation technique consisting in the alternated wetting of only one side of the rootzone, which induces partial stomatal closure and increased water use efficiency. The effect of PRD and rootstock vigor on ‘Pink Lady’ apple fruit quality and aroma profile was studied using solid-phase micro-extraction in headspace and gas chromatography/mass spectrometry. RESULTS: PRD irrigation generally did not affect quality attributes, whereas it influenced the aroma of the apple fruit. In particular, PRD improved the aroma of the fruit flesh, while it decreased the volatile fraction in the peel, where most of the compounds are concentrated.…
Heading which way? Y-maze chemical assays: not all crustaceans are alike
2015
In a world full of chemicals, many crustaceans rely on elaborate olfactory systems to guide behaviors related to finding food or to assess the presence of conspecifics and predators. We analyzed the responses of the isopod Saduria entomon to a range of stimuli by which the animal is likely to encounter in its natural habitat using a Y-maze bioassay. In order to document the efficiency of the experimental design, the same bioassay was used to test the behavior of the crayfish Procambarus fallax whose ability to track odors is well documented. The crayfish performed well in the Y-maze and were able to locate the source of a food-related odor with high fidelity. The isopod S. entomon reacted i…
L'usurpazione di Giovanni: la ricerca della legittimazione, la vittoria sul tyrannus
2020
John’s usurpation: the pursuit of legitimacy, the victory over the tyrannus · In November 423, three months after the death of Honorius, the usurper John was proclaimed em- peror in Rome. He had been primicerius notariorum at the court of Ravenna and his elevation was made by the members of the aulé, as Procopius reports. Neverthless, the sources are not agreed: Malala says that John was a synkletikoi and ruled supported by the synkletikoi The literary and numismatic evidence shows that John aspired to recognition as lawful sovereign in the two parts of the Empire. Theodosius restored order and legitimacy to the West with the military intervention and the proclamation of Valentinian III as…