24 documents found, page 1 of 3
Insect-based chitin and chitosan from whole body sources and rearing by-product...
Navarro, Pedro; Ribeiro, José Carlos Reis; Luís, Ângelo Filipe Santos; Domingues, Fernanda; Anjos, Ofélia; Cunha, LuisFractionation of edible insects and their rearing by-products can lead to expanded industrial applications and extraction of value-added products. The main goal of this study was to extract chitin and synthesise chitosan from three different insect sources – Tenebrio molitor larvae, adult Acheta domesticus and A. domesticus rearing by-products (legs and wings). Furthermore, the physicochemical, structural, and ...
Quorum sensing inhibition evaluation method: An experiment-based microbiology l...
Luís, Ângelo Filipe Santos; Domingues, FernandaBacteria have developed a cell-to-cell communication system called quorum sensing (QS), allowing them to regulate group behavior and synchronize the expression of virulence factors, responsible for increasing their infection capacity and resistance to antimicrobials. Although the control of microbial infections through the inhibition of microbial growth has traditionally been the basis of antimicrobial chemothe...
Evaluation of Bile Salts on the Survival and Modulation of Virulence of Aliarco...
Mateus, Cristiana; Maia, Cláudio J.; Domingues, Fernanda; Bücker, Roland; Oleastro, Mónica; Ferreira, SusanaAliarcobacter butzleri is a Gram-negative bacterium associated with infections of the gastrointestinal tract and widely distributed in various environments. For successful infection, A. butzleri should be able to tolerate various stresses during gastrointestinal passage, such as bile. Bile represents an antimicrobial host barrier that acts against external noxious agents and consists of a variety of bile salts....
Putative Role of an ABC Efflux System in Aliarcobacter butzleri Resistance and ...
Martins, Inês; Mateus, Cristiana; Domingues, Fernanda; Oleastro, Mónica; Ferreira, SusanaAbstract: Aliarcobacter butzleri is considered a ubiquitous microorganism and emergent pathogen, for which increasing rates of multidrug resistance have been described. In line with this, the present work aimed to evaluate for the first time the contribution of an ABC efflux system, the YbhFSR, in the resistance and virulence of this bacterium. Following the in silico characterization of the YbhFSR transporter,...
Effect of Atmospheric Conditions on Pathogenic Phenotypes of Arcobacter butzleri
Martins, Rodrigo; Mateus, Cristiana; Domingues, Fernanda; Bücker, Roland; Oleastro, Mónica; Ferreira, SusanaArcobacter butzleri is an emergent gram-negative enteropathogenic bacterium widespread in different environments and hosts. During the colonization of the gastrointestinal tract, bacteria face a variety of environmental conditions to successfully establish infection in a new host. One of these challenges is the fluctuation of oxygen concentrations encountered not only throughout the host gastrointestinal tract ...
The Prevalence of Arcobacteraceae in Aquatic Environments: A Systematic Review ...
Venâncio, Igor; Luís, Ângelo; Domingues, Fernanda; Oleastro, Mónica; Pereira, Luísa; Ferreira, SusanaMembers of the family Arcobacteraceae are distributed widely in aquatic environments, and some of its species have been associated with human and animal illness. However, information about the diversity and distribution of Arcobacteraceae in different water bodies is still limited. In order to better characterize the health risk posed by members in the family Arcobacteraceae, a systematic review and meta-analys...
Chitin and chitosan extraction from edible insects : characterization and compa...
Navarro, Pedro; Ribeiro, J.C.; Anjos, O.; Domingues, Fernanda; Cunha, Luís MiguelThe main goals of this work were to extract chitin and sinthetize chitosan from two different edible insect species - Tenebrio molitor larvae (TM) and Acheta domesticus (AD) as well as from by-products from A. domesticus processing (wings and legs-AD_WL).
Natural Transformation as a Mechanism of Horizontal Gene Transfer in Aliarcobac...
Bonifácio, Marina; Mateus, Cristiana; Alves, Ana R.; Maldonado, Emanuel; Duarte, Ana Paula; Domingues, Fernanda; Oleastro, Mónica; Ferreira, SusanaAliarcobacter butzleri is an emergent enteropathogen, showing high genetic diversity, which likely contributes to its adaptive capacity to different environments. Whether natural transformation can be a mechanism that generates genetic diversity in A. butzleri is still unknown. In the present study, we aimed to establish if A. butzleri is naturally competent for transformation and to investigate the factors inf...
Antimicrobial and antitumor activity of S-methyl dithiocarbazate Schiff base zi...
Ramilo-Gomes, Filipa; Addis, Yemataw; Tekamo, Israel; Cavaco, Isabel; Campos, Débora L. [UNESP]; Pavan, Fernando R. [UNESP]; Gomes, Clara S.B.Made available in DSpace on 2021-06-25T11:09:35Z (GMT). No. of bitstreams: 0 Previous issue date: 2021-03-01; Schiff bases (SB) obtained from S-methyl dithiocarbazate and aromatic aldehydes: salicylaldehyde (H2L1), o-vanillin (H2L2), pyridoxal (H2L3) and 2,6-diformyl-4-methylphenol (H3L4), and their corresponding Zn(II)-complexes (1–4), are synthesized. All compounds are characterized by elemental analyses, inf...
RND Efflux Systems Contribute to Resistance and Virulence of Aliarcobacter butz...
Mateus, Cristiana; Nunes, Ana Rita; Oleastro, Mónica; Domingues, Fernanda; Ferreira, SusanaAliarcobacter butzleri is an emergent enteropathogen that can be found in a range of environments. This bacterium presents a vast repertoire of efflux pumps, such as the ones belonging to the resistance nodulation cell division family, which may be associated with bacterial resistance, as well as virulence. Thus, this work aimed to evaluate the contribution of three RND efflux systems, AreABC, AreDEF and AreGHI...