13 research outputs found
The Presence of Flavonoids in Some Products and Fruits of the Genus Eugenia: An Integrative Review
ReviewThe Myrtaceae family, one of the most prominent botanical families, is represented in Brazil
with different fruit species, rich in bioactive compounds and gastronomically appreciated.
This study aimed to carry out an integrative review on the genus Eugenia, highlighting the
pitangueira (E. uniflora L.), cagaiteira (E. dysenterica), grumixameira (E. brasiliensis), pereira
(E. klotzschiana O. Berg), and uvaieira (E. pyriformis Cambess) and which flavonoids are
present in these fruits. Articles published between 2016 and 2021 were selected from the
following databases: Google Scholar, Periódicos CAPES, Scielo, and Science Direct.
According to each database, the descriptors used as a search strategy addressed the
popular and scientific names of the five selected species, associated or not with the term
“flavonoid,” according to each database. The results showed that quercetin was the main
flavonoid identified in the fruits, and the principal extraction method used was HPLC. Other
interesting compounds, such as catechin, epicatechin, rutin, myricetin, and kaempferol,
were also found. However, the amount and type of flavonoids detected varied according to
the applied methodology. Hence, these studies highlight the importance of species of the
genus Eugenia, which promotes beneficial health effects and possible applicability to the
food and pharmaceutical industryinfo:eu-repo/semantics/publishedVersio
A nonsmooth algorithm for cone-constrained eigenvalue problems
International audienceWe study several variants of a nonsmooth Newton-type algorithm for solving an eigenvalue problem of the form . Such an eigenvalue problem arises in mechanics and in other areas of applied mathematics. The symbol refers to a closed convex cone in the Euclidean space and is a pair of possibly asymmetric matrices of order . Special attention is paid to the case in which is the nonnegative orthant of . The more general case of a possibly unpointed polyhedral convex cone is also discussed in detail
Fabrication of molybdenum carbide catalysts over multi-walled carbon nanotubes by carbothermal hydrogen reduction
Caracterização e custos de acidentes de motocicleta com vítimas atendidas em regime de hospitalização no município de Paranavaí-PR no ano de 2007
Estudo anatômico comparativo da região cefálica pré-branquial de Sphyrna lewini (Griffith & Smith) e Rhizoprionodon lalandii (Valenciennes) (Elasmobranchii, Carcharhiniformes) relacionados com a presença do cefalofólio em Sphyrna Rafinesque
The strength–grain size relationship in ultrafine-grained metals
Metals processed by severe plastic deformation (SPD) techniques, such as equal-channel angular pressing (ECAP) and high-pressure torsion (HPT), generally have submicrometer grain sizes. Consequently, they exhibit high strength as expected on the basis of the Hall–Petch (H–P) relationship. Examples of this behavior are discussed using experimental data for Ti, Al, and Ni. These materials typically have grain sizes greater than ~50 nm where softening is not expected. An increase in strength is usually accompanied by a decrease in ductility. However, both high strength and high ductility may be achieved simultaneously by imposing high strain to obtain ultrafine-grain sizes and high fractions of high-angle grain boundaries. This facilitates grain boundary sliding, and an example is presented for a cast Al-7 pct Si alloy processed by HPT. In some materials, SPD may result in a weakening even with a very fine grain size, and this is due to microstructural changes during processing. Examples are presented for an Al-7034 alloy processed by ECAP and a Zn-22 pct Al alloy processed by HPT. In some SPD-processed materials, it is possible that grain boundary segregation and other features are present leading to higher strengths than predicted by the H–P relationshi