Search results for "Alain"

Antioxidant activities of sicilian prickly pear (Opuntia ficus indica) fruit extracts and reducing properties of its betalains: betanin and indicaxan…

2002

Sicilian cultivars of prickly pear (Opuntia ficus indica) produce yellow, red, and white fruits, due to the combination of two betalain pigments, the purple-red betanin and the yellow-orange indicaxanthin. The betalain distribution in the three cultivars and the antioxidant activities of methanolic extracts from edible pulp were investigated. In addition, the reducing capacity of purified betanin and indicaxanthin was measured. According to a spectrophotometric analysis, the yellow cultivar exhibited the highest amount of betalains, followed by the red and white ones. Indicaxanthin accounted for about 99% of betalains in the white fruit, while the ratio of betanin to indicaxanthin varied fr…

Theoretical Determination of the pK a Values of Betalamic Acid Related to the Free Radical Scavenger Capacity: Comparison Between Empirical and Quant…

2015

Health benefits of dietary phytochemicals have been suggested in recent years. Among 1000s of different compounds, Betalains, which occur in vegetables of the Cariophyllalae order (cactus pear fruits and red beet), have been considered because of reducing power and potential to affect redox-modulated cellular processes. The antioxidant power of Betalains is strictly due to the dissociation rate of the acid moieties present in all the molecules of this family of phytochemicals. Experimentally, only the pK a values of betanin were determined. Recently, it was evidenced it was evidenced as the acid dissociation, at different environmental pHs, affects on its electron-donating capacity, and fur…

In vitro digestion of betalainic foods. Stability and bioaccessibility of betaxanthins and betacyanins and antioxidative potential of food digesta.

2008

Betalains are considered to be bioactive dietary phytochemicals. The stability of betacyanins and betaxanthins from either fresh foods or manufactured products of cactus pear fruit ( Opuntia ficus indica L. Mill. cv. Gialla and Rossa) and red beet ( Beta vulgaris L. ssp. vulgaris) was assessed in a simulated oral, gastric, and small intestinal digestion and compared with the digestive stability of purified pigments. A minor loss of indicaxanthin, at the gastric-like environment only, and a decrease of vulgaxanthin I through all digestion steps were observed, which was not affected by food matrix. In contrast, food matrix prevented decay of betanin and isobetanin at the gastric-like environm…

Betanin inhibits the myeloperoxidase/nitrite-induced oxidation of human low-density lipoproteins

2007

Production of nitrogen dioxide by the activity of myeloperoxidase (MPO) in the presence of nitrite is now considered a key step in the pathophysiology of low-density lipoprotein (LDL) oxidation. This study shows that betanin, a phytochemical of the betalain class, inhibits the production of lipid hydroperoxides in human LDL submitted to a MPO/nitrite-induced oxidation. Kinetic measurements including time-course of particle oxidation and betanin consumption, either in the presence or in the absence of nitrite, suggest that the antioxidant effect is possibly the result of various actions. Betanin scavenges the initiator radical nitrogen dioxide and can also act as a lipoperoxyl radical-scaven…

Ma‘dûle Önermelerde Varlıksal İçerik Sorunu: Fahreddin er-Râzî-Kutbüddin et-Tahtânî Tartışması

2019

This paper addresses discussions in post-Avicennan Arabic logic on the definition of metathetic propositions and their status in relation to existential import requirements, focusing on the arguments made by Fakhr al-Dīn al-Rāzī (d. 606/1210) and the counter-arguments by Quṭb al-Dīn al-Rāzī al-Taḥtānī (d. 766/1365), who both establish their positions in the framework drawn by the most prominent figure in the tradition of classical Arabic logic, Avicenna (Ibn Sīnā, d. 428/1037). In the latter’s works, the problem of the existential import requirement in metathetic propositions (ma‘dūla) are thoroughly discussed and Avicenna seems to have presumed the existential import as a truth-condition f…

Why is there truth? Foucault in the age of post-truth politics

2019

Contemporary debates about post‐truth politics have raised the question of the complicity of Michel Foucault’s thought in the apparent decline of the authority of truth in Western democracies. In this article we probe this question in the analysis of Foucault’s theory of true discourses developed in his 1980‐1981 lecture course ‘Subjectivity and Truth’. In this course Foucault argues for non‐necessary and supplementary character of truths in relation to the reality of which they speak. This argument leads him to abandon the familiar approaches to truth as reflecting, concealing or rationalizing reality and look for the effects of truth in the processes of subjectivation. We explore the affi…

Idean politiikka : Arendt ja Badiou

2013

Politics of the Idea: (Anti-)Platonic Politics in Arendt and Badiou

2020

This paper compares two influential but conflicting contemporary models of politics as an activity: those of Hannah Arendt and Alain Badiou. It discovers the fundamental difference between their approaches to politics in their opposing evaluations of the contemporary political significance of the legacy of Plato, Platonism, and the Platonic Idea. Karl Popper’s and Arendt’s analyses of the inherently ideological nature of totalitarianism are contrasted with Badiou’s vindication of an ideological “politics of the Idea.” Arendt and Badiou are shown to share an understanding of politics as a realm for the human deployment of novelty and world-transformation. Their key disagreement concerns the …

Functional foods and nutraceuticals: a way to improve health, prevent disease, and delay aging. The case of cactus pear.

2007

Cactus pear fruits have recently been the object of scientific research aimed at revealing bioactive components. This short review summarizes results obtained by our group. The two characteristic betalain pigments, betanin and indicaxanthin, appear promising molecules to be considered nutraceutical compounds.

Una ética de la excelencia: Cayetana de la Cerda y la circulación de Madame de Lambert en España

2015

En este artículo se sintetizan las líneas maestras del pensamiento de Anne-Thérèse Marguenat, marquesa de Lambert (1647-1733) y se profundiza en el eco que su obra tuvo en España, aclarando algunos episodios poco conocidos y arrojando luz sobre el contexto en el que se realizó y publicó finalmente la versión castellana de sus ensayos y sobre la personalidad intelectual y circunstancias sociales de su traductora, Cayetana de la Cerda y Vera, condesa de Lalaing (1755-1798). Se pretende así analizar las prácticas de transferencia y mediación cultural, interrogándonos sobre los significados con que su pensamiento y su figura pudieron ser investidos por parte de los sujetos implicados en su lect…