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1.
Rev Neurol (Paris) ; 2024 May 27.
Artigo em Inglês | MEDLINE | ID: mdl-38806361

RESUMO

Discussing Marian apparitions in the light of current knowledge in neuroscience is a challenge: the testimonies are often old and indirect, and the "visionaries" could not be questioned or even examined according to current neurological or psychiatric standards. In doing so, we are not unaware of the heterogeneity of seers and the facts they reported: there is not necessarily a single hypothesis. It is the appearances of Île Bouchard that will be discussed here. Our interpretation calls on two non-exclusive "mechanisms": on the one hand, mental imagery, which we know can be unconscious and is modulated or generated by frontal "top-down" mechanisms; on the other hand, the sociological consideration of events, using the concept of enchantment.

2.
Antimicrob Agents Chemother ; 64(12)2020 11 17.
Artigo em Inglês | MEDLINE | ID: mdl-32900686

RESUMO

The antifungal susceptibility of Aspergillus cryptic species is poorly known. We assessed 51 isolates, belonging to seven Fumigati cryptic species, by the EUCAST reference method and the concentration gradient strip (CGS) method. Species-specific patterns were observed, with high MICs for azole drugs, except for Aspergillus hiratsukae and Aspergillus tsurutae, and high MICs for amphotericin B for Aspergillus lentulus and Aspergillus udagawae Essential and categorical agreements between EUCAST and CGS results were between 53.3 and 93.3%.


Assuntos
Antifúngicos , Aspergillus , Antifúngicos/farmacologia , Aspergillus/efeitos dos fármacos , Testes de Sensibilidade Microbiana
3.
J Public Health (Oxf) ; 42(3): e299-e310, 2020 08 18.
Artigo em Inglês | MEDLINE | ID: mdl-31686110

RESUMO

BACKGROUND: Exposure to conflict, violence and forced displacement can increase poor mental health among affected populations. Our aim was to examine evidence on the burden of mental disorders and access to and effectiveness of mental health and psychosocial support (MHPSS) services in Syria and among Syrian refugees in neighboring countries. METHODS: A systematic review was done following systematic review criteria. Twelve bibliographic databases and additional gray literature sources were searched for quantitative and qualitative studies. Descriptive analysis and quality assessment were conducted. RESULTS: Twenty-eight eligible studies were identified, of which two were with conflict-affected populations within Syria. Levels of post-traumatic stress disorder ranged from 16 to 84%, depression from 11 to 49%, and anxiety disorder from 49 to 55%. Common risk factors were exposures to trauma and having a personal or family history of mental disorder. Financial and socio-cultural barriers were identified as the main obstacles to accessing MHPSS care. Evaluations of MHPSS services, albeit from predominantly nonrandomised designs, reported positive treatment outcomes. CONCLUSIONS: The MHPSS burden was high, but with considerable variation between studies. There are key evidence gaps on: MHPSS burden and interventions-particularly for those living within Syria; access and barriers to care; and implementation and evaluation of MHPSS interventions.


Assuntos
Transtornos Mentais , Serviços de Saúde Mental , Refugiados , Humanos , Transtornos Mentais/epidemiologia , Transtornos Mentais/terapia , Saúde Mental , Sistemas de Apoio Psicossocial , Síria
4.
Mycopathologia ; 185(1): 161-168, 2020 Feb.
Artigo em Inglês | MEDLINE | ID: mdl-31093849

RESUMO

Recent taxonomical revisions based on multilocus gene sequencing have provided some clarifications to dermatophyte (Arthrodermataceae) family tree. These changes promoted us to investigate the impact of the changed nomenclature of the dermatophyte strains in the BCCM/IHEM fungal collection, which contains strains of all dermatophyte genera except for Ctenomyces. For 688 strains from this collection, both internal transcribed spacer region (ITS) and partial ß-tubulin (BT) sequences were aligned and a multilocus phylogenetic tree was constructed. The ITS + BT phylogentic tree was able to distinguish the genera Arthroderma, Lophophyton, Microsporum, Paraphyton, Nannizzia and Trichophyton with high certainty. Epidermophyton, which is widely considered as a well-defined genus with E. floccosum as the only representative, fell within the Nannizzia clade, whereas the phylogenetic analysis, based on the ITS region alone, differentiates Epidermophyton from Nannizzia as a separate genus. Re-identification and reclassification of many strains in the collection have had a profound impact on the composition of the BCCM/IHEM dermatophyte collection. The biggest change is the decline of prevalence of Arthroderma strains; starting with 103 strains, only 22 strains remain in the genus after reassessment. Most Arthroderma strains were reclassified into Trichophyton, with A. benhamiae and A. vanbreuseghemii leaving the genus. The amount of Microsporum strains also dropped significantly with most of these strains being reclassified into the genera Paraphyton and Nannizzia.


Assuntos
Arthrodermataceae/genética , Arthrodermataceae/classificação , Epidermophyton/classificação , Epidermophyton/genética , Microsporum/classificação , Microsporum/genética , Filogenia , Tubulina (Proteína)/genética
5.
Appl Environ Microbiol ; 85(21)2019 11 01.
Artigo em Inglês | MEDLINE | ID: mdl-31471301

RESUMO

In the context of open science, the availability of research materials is essential for knowledge accumulation and to maximize the impact of scientific research. In microbiology, microbial domain biological resource centers (mBRCs) have long-standing experience in preserving and distributing authenticated microbial strains and genetic materials (e.g., recombinant plasmids and DNA libraries) to support new discoveries and follow-on studies. These culture collections play a central role in the conservation of microbial biodiversity and have expertise in cultivation, characterization, and taxonomy of microorganisms. Information associated with preserved biological resources is recorded in databases and is accessible through online catalogues. Legal expertise developed by mBRCs guarantees end users the traceability and legality of the acquired material, notably with respect to the Nagoya Protocol. However, awareness of the advantages of depositing biological materials in professional repositories remains low, and the necessity of securing strains and genetic resources for future research must be emphasized. This review describes the unique position of mBRCs in microbiology and molecular biology through their history, evolving roles, expertise, services, challenges, and international collaborations. It also calls for an increased deposit of strains and genetic resources, a responsibility shared by scientists, funding agencies, and publishers. Journal policies requesting a deposit during submission of a manuscript represent one of the measures to make more biological materials available to the broader community, hence fully releasing their potential and improving openness and reproducibility in scientific research.


Assuntos
Bases de Dados Factuais , Microbiologia , Biologia Molecular , Biodiversidade , Humanos , Publicação de Acesso Aberto
6.
J Clin Microbiol ; 56(5)2018 05.
Artigo em Inglês | MEDLINE | ID: mdl-29491019

RESUMO

Conventional dermatophyte identification is based on morphological features. However, recent studies have proposed to use the nucleotide sequences of the rRNA internal transcribed spacer (ITS) region as an identification barcode of all fungi, including dermatophytes. Several nucleotide databases are available to compare sequences and thus identify isolates; however, these databases often contain mislabeled sequences that impair sequence-based identification. We evaluated five of these databases on a clinical isolate panel. We selected 292 clinical dermatophyte strains that were prospectively subjected to an ITS2 nucleotide sequence analysis. Sequences were analyzed against the databases, and the results were compared to clusters obtained via DNA alignment of sequence segments. The DNA tree served as the identification standard throughout the study. According to the ITS2 sequence identification, the majority of strains (255/292) belonged to the genus Trichophyton, mainly T. rubrum complex (n = 184), T. interdigitale (n = 40), T. tonsurans (n = 26), and T. benhamiae (n = 5). Other genera included Microsporum (e.g., M. canis [n = 21], M. audouinii [n = 10], Nannizzia gypsea [n = 3], and Epidermophyton [n = 3]). Species-level identification of T. rubrum complex isolates was an issue. Overall, ITS DNA sequencing is a reliable tool to identify dermatophyte species given that a comprehensive and correctly labeled database is consulted. Since many inaccurate identification results exist in the DNA databases used for this study, reference databases must be verified frequently and amended in line with the current revisions of fungal taxonomy. Before describing a new species or adding a new DNA reference to the available databases, its position in the phylogenetic tree must be verified.


Assuntos
Arthrodermataceae/classificação , Arthrodermataceae/genética , Código de Barras de DNA Taxonômico/métodos , Dermatomicoses/microbiologia , Arthrodermataceae/isolamento & purificação , Análise por Conglomerados , DNA Fúngico/química , DNA Fúngico/genética , DNA Espaçador Ribossômico/química , DNA Espaçador Ribossômico/genética , Dermatomicoses/diagnóstico , Humanos , Filogenia , Estudos Prospectivos , Análise de Sequência de DNA
7.
J Clin Microbiol ; 55(9): 2661-2670, 2017 09.
Artigo em Inglês | MEDLINE | ID: mdl-28637907

RESUMO

Matrix-assisted laser desorption ionization-time of flight (MALDI-TOF) mass spectrometry has emerged as a reliable technique to identify molds involved in human diseases, including dermatophytes, provided that exhaustive reference databases are available. This study assessed an online identification application based on original algorithms and an extensive in-house reference database comprising 11,851 spectra (938 fungal species and 246 fungal genera). Validation criteria were established using an initial panel of 422 molds, including dermatophytes, previously identified via DNA sequencing (126 species). The application was further assessed using a separate panel of 501 cultured clinical isolates (88 mold taxa including dermatophytes) derived from five hospital laboratories. A total of 438 (87.35%) isolates were correctly identified at the species level, while 26 (5.22%) were assigned to the correct genus but the wrong species and 37 (7.43%) were not identified, since the defined threshold of 20 was not reached. The use of the Bruker Daltonics database included in the MALDI Biotyper software resulted in a much higher rate of unidentified isolates (39.76 and 74.30% using the score thresholds 1.7 and 2.0, respectively). Moreover, the identification delay of the online application remained compatible with real-time online queries (0.15 s per spectrum), and the application was faster than identifications using the MALDI Biotyper software. This is the first study to assess an online identification system based on MALDI-TOF spectrum analysis. We have successfully applied this approach to identify molds, including dermatophytes, for which diversity is insufficiently represented in commercial databases. This free-access application is available to medical mycologists to improve fungal identification.


Assuntos
Arthrodermataceae/classificação , Bases de Dados Factuais , Dermatomicoses/diagnóstico , Técnicas de Tipagem Micológica/métodos , Sistemas On-Line , Espectrometria de Massas por Ionização e Dessorção a Laser Assistida por Matriz/métodos , Algoritmos , Dermatomicoses/microbiologia , Humanos , Técnicas de Tipagem Micológica/instrumentação , Software
8.
Aerobiologia (Bologna) ; 33(2): 181-189, 2017.
Artigo em Inglês | MEDLINE | ID: mdl-28579673

RESUMO

The European Commission Cooperation in Science and Technology (COST) Action FA1203 "SMARTER" aims to make recommendations for the sustainable management of Ambrosia across Europe and for monitoring its efficiency and cost-effectiveness. The goal of the present study is to provide a baseline for spatial and temporal variations in airborne Ambrosia pollen in Europe that can be used for the management and evaluation of this noxious plant. The study covers the full range of Ambrosia artemisiifolia L. distribution over Europe (39°N-60°N; 2°W-45°E). Airborne Ambrosia pollen data for the principal flowering period of Ambrosia (August-September) recorded during a 10-year period (2004-2013) were obtained from 242 monitoring sites. The mean sum of daily average airborne Ambrosia pollen and the number of days that Ambrosia pollen was recorded in the air were analysed. The mean and standard deviation (SD) were calculated regardless of the number of years included in the study period, while trends are based on those time series with 8 or more years of data. Trends were considered significant at p < 0.05. There were few significant trends in the magnitude and frequency of atmospheric Ambrosia pollen (only 8% for the mean sum of daily average Ambrosia pollen concentrations and 14% for the mean number of days Ambrosia pollen were recorded in the air). The direction of any trends varied locally and reflected changes in sources of the pollen, either in size or in distance from the monitoring station. Pollen monitoring is important for providing an early warning of the expansion of this invasive and noxious plant.

9.
Med Mycol ; 53(5): 462-9, 2015 Jun.
Artigo em Inglês | MEDLINE | ID: mdl-25841053

RESUMO

Utilizing matrix-assisted laser desorption/ionization time-of-flight (MALDI-TOF) mass spectra for Candida glabrata typing would be a cost-effective and easy-to-use alternative to classical DNA-based typing methods. This study aimed to use MALDI-TOF for the typing of C. glabrata clinical isolates from various geographical origins and test its capacity to differentiate between fluconazole-sensitive and -resistant strains.Both microsatellite length polymorphism (MLP) and MALDI-TOF mass spectra of 58 C. glabrata isolates originating from Marseilles (France) and Tunis (Tunisia) as well as collection strains from diverse geographic origins were analyzed. The same analysis was conducted on a subset of C. glabrata isolates that were either susceptible (MIC ≤ 8 mg/l) or resistant (MIC ≥ 64 mg/l) to fluconazole.According to the seminal results, both MALDI-TOF and MLP classifications could highlight C. glabrata population structures associated with either geographical dispersal barriers (p < 10(-5)) or the selection of antifungal drug resistance traits (<10(-5)).In conclusion, MALDI-TOF geographical clustering was congruent with MPL genotyping and highlighted a significant population genetic structure according to fluconazole susceptibility in C. glabrata. Furthermore, although MALDI-TOF and MLP resulted in distinct classifications, MALDI-TOF also classified the isolates with respect to their fluconazole susceptibility profile. Further prospective studies are required to evaluate the capacity of MALDI-TOF typing to investigate C. glabrata infection outbreaks and predict the antifungal susceptibility profile of clinical laboratory isolates.


Assuntos
Antifúngicos/farmacologia , Candida glabrata/isolamento & purificação , Candidíase/epidemiologia , Farmacorresistência Fúngica , Fluconazol/farmacologia , Técnicas de Tipagem Micológica , Espectrometria de Massas por Ionização e Dessorção a Laser Assistida por Matriz , Candida glabrata/química , Candida glabrata/classificação , Candida glabrata/efeitos dos fármacos , Candidíase/microbiologia , Análise por Conglomerados , França/epidemiologia , Genótipo , Humanos , Testes de Sensibilidade Microbiana , Repetições de Microssatélites , Tipagem Molecular , Fenótipo , Topografia Médica , Tunísia/epidemiologia
10.
J Clin Microbiol ; 52(9): 3440-3, 2014 Sep.
Artigo em Inglês | MEDLINE | ID: mdl-25031434

RESUMO

The performance of a matrix-assisted laser desorption ionization-time of flight mass spectrometry (MALDI-TOF MS) workflow using an extensive reference database for dermatophyte identification was evaluated on 176 clinical strains. Using a direct-deposit procedure after 3 incubation days yielded 40% correct identification. Both increasing incubation time and using an extraction procedure resulted in 100% correct identification.


Assuntos
Arthrodermataceae/classificação , Arthrodermataceae/isolamento & purificação , Técnicas de Laboratório Clínico/métodos , Dermatomicoses/diagnóstico , Dermatomicoses/microbiologia , Espectrometria de Massas por Ionização e Dessorção a Laser Assistida por Matriz/métodos , Arthrodermataceae/química , Humanos , Manejo de Espécimes/métodos , Fatores de Tempo
11.
Zootaxa ; 5418(5): 501-527, 2024 Mar 04.
Artigo em Inglês | MEDLINE | ID: mdl-38480343

RESUMO

Two species of the genus Boreomysis, B. arctica (Kryer, 1861) and B. californica Ortmann, 1894, were collected in western Mexico. In the eastern Pacific, Boreomysis arctica had previously been recorded from the Bering Sea to southern California. New records in Mexico extend its southernmost distribution limit to 172533 N, off SW Mexico, including samples collected off the west coast of the Baja California Peninsula and the Gulf of California (25 specimens in 12 samples). In the eastern Pacific, B. californica has been reported from Alaska to Peru, with its type locality in the Central Gulf of California. During this study, it was by far the most frequently species collected (343 specimens in 58 samples) off the west coast of the Baja California Peninsula in the Gulf of California, and off SW Mexico (south to 165800 N).


Assuntos
Crustáceos , Animais , México
12.
Food Chem ; 454: 139762, 2024 Oct 01.
Artigo em Inglês | MEDLINE | ID: mdl-38805919

RESUMO

Different quantification methods for in vitro amylolysis were compared for individual chickpea and lentil cotyledon cells (ICC) as a relevant case study. For the first time, much-applied spectrophotometric methods relying on the quantification of certain functional groups (i.e., DNS, GOPOD) were compared to chromatographic quantification of starch metabolites (HPLC-ELSD). The estimated rate constant and linked initial rates of amylolysis were highly correlated for DNS, GOPOD, and HPLC-ELSD. However, absolute amylolysis levels depended on the applied method and sample-specific metabolite formation patterns. Multiresponse modelling was employed to further investigate HPLC-ELSD metabolite formation patterns. This delivered insight into the relative importance of different amylolysis reactions during in vitro digestion of pulse ICC, proving that maltotriose and maltose formation determined the overall amylolysis rate in this case. Multiresponse reaction rate constants of maltotriose and maltose formation were highly correlated to single response amylolysis rate constants (and initial rates) obtained for all three quantification methods.


Assuntos
Cicer , Cotilédone , Digestão , Lens (Planta) , Amido , Amido/metabolismo , Amido/química , Cotilédone/química , Cotilédone/metabolismo , Lens (Planta)/química , Lens (Planta)/metabolismo , Cicer/química , Cicer/metabolismo , Cromatografia Líquida de Alta Pressão , Cinética , Modelos Biológicos , Trissacarídeos
13.
Food Chem ; 423: 136303, 2023 Oct 15.
Artigo em Inglês | MEDLINE | ID: mdl-37182489

RESUMO

Recently, pulse ingredients with (partial) cellular intactness are put forward as promising innovative food ingredients with slowed macronutrient digestibility. This study compared cooking quality and nutrient (starch, protein, and mineral) digestibility/bioaccessibility of lentil-based pasta prepared from 100% raw-milled flour, and by substituting 30% of the formulation by isolated cotyledon cell powder or whole precooked powder. Formulation had little effect on cooking properties. Both amylolysis and proteolysis were significantly slowed by incorporating cellular ingredients: towards the end of simulated digestion, amylolysis was lowered by 16-25%, while differences in proteolysis became small. Cellular ingredient incorporation slightly decreased Zn and Mg but did not affect Ca and Fe bioaccessibility, overall yielding a low mineral bioaccessibility comparable to cooked whole pulses. To conclude, lentil-based pasta substituted with cellular ingredients showed improved nutritional properties (i.e., high in digestible protein and slowed amylolysis), with perspectives for the development of different innovative foods with targeted nutritional properties.


Assuntos
Lens (Planta) , Pós , Nutrientes , Culinária , Farinha/análise , Minerais , Amido , Digestão
14.
J Clin Microbiol ; 50(10): 3371-3, 2012 Oct.
Artigo em Inglês | MEDLINE | ID: mdl-22837317

RESUMO

We report a reactive Aspergillus galactomannan enzymatic immunoassay against the serum of a patient with invasive Prototheca zopfii infection. Analysis of the supernatants of suspensions of P. zopfii and other Prototheca isolates revealed positive results as well. These data suggest cross-reactivity with the serum Aspergillus galactomannan assay in invasive protothecosis.


Assuntos
Aspergillus/imunologia , Técnicas de Laboratório Clínico/métodos , Reações Cruzadas , Mananas/sangue , Micoses/diagnóstico , Prototheca/imunologia , DNA Fúngico/química , DNA Fúngico/genética , Galactose/análogos & derivados , Humanos , Técnicas Imunoenzimáticas/métodos , Masculino , Pessoa de Meia-Idade , Dados de Sequência Molecular , Micoses/microbiologia , Micoses/patologia , Sensibilidade e Especificidade , Análise de Sequência de DNA
15.
Mycoses ; 55(2): 148-55, 2012 Mar.
Artigo em Inglês | MEDLINE | ID: mdl-21929560

RESUMO

Black Aspergilli are widely distributed in the environment and are frequently reported as causative agents of different types of mycoses. Many taxonomical revisions have been made, and presently 19 different species are accepted. In this study we (re-) identified 123 strains of the Aspergillus niger group of the BCCM/IHEM collection to check for the presence of species other than A. niger in both environmental and clinical samples. The susceptibility for antifungal drugs was compared between A. niger and Aspergillus tubingensis. Strains were identified based on morphological and molecular data and neighbour joining analysis. We revealed the presence of eight different species of this group in our collection. Our results suggest that Aspergillus foetidus, previously shown to be a species closely related to A. niger should not be considered as a separate species, but rather as a variety of A. niger. Furthermore, we found A. tubingensis at the same prevalence than A. niger in clinical samples. Interestingly, A. niger was shown to have a twofold higher sensitivity to treatment with voriconazole and itraconazole than A. tubingensis. These findings underline once more the importance of correct identification up to the species level in clinical isolates.


Assuntos
Antifúngicos/farmacologia , Aspergilose/microbiologia , Aspergillus/genética , DNA Fúngico/análise , Aspergillus/classificação , Aspergillus/efeitos dos fármacos , Aspergillus/isolamento & purificação , Bancos de Espécimes Biológicos , Humanos , Itraconazol/farmacologia , Testes de Sensibilidade Microbiana , Técnicas de Tipagem Micológica , Filogenia , Reação em Cadeia da Polimerase , Pirimidinas/farmacologia , Triazóis/farmacologia , Voriconazol
16.
Food Res Int ; 158: 111546, 2022 08.
Artigo em Inglês | MEDLINE | ID: mdl-35840240

RESUMO

(Cellular) pulse powders are being proposed as ingredients for different foods. However, the effect of manufacturing conditions on the properties of those powders remained unknown. Therefore, this study investigated the effect of specific manufacturing conditions (cooking time, application of cell isolation, and drying method) on the composition, microstructure, and in vitro starch and protein digestibility of lentil powders. Next to powders consisting of isolated cotyledon cells (ICC), this study proposes the production of precooked whole lentil powders (WL), without a cellular isolation step. In a model food system (heat-treated suspension), starch and protein digestion were significantly attenuated for both WL and ICC compared to raw-milled lentil flour. The applied cooking time determined macronutrient digestibility in the powders by (i) affecting the susceptibility of ICC to in vitro digestion, and (ii) determining the microstructural properties of WL. Freeze-dried ICC powder showed a stronger attenuation of amylolysis compared air-dried ICC. This study showed that WL powders have an important potential as innovative food ingredients higher in fiber but lower in starch compared to ICC.


Assuntos
Lens (Planta) , Amido , Culinária , Fibras na Dieta , Farinha/análise , Lens (Planta)/química , Pós , Amido/química
17.
J Sch Psychol ; 90: 1-18, 2022 02.
Artigo em Inglês | MEDLINE | ID: mdl-34969482

RESUMO

The goal of this study was to investigate the transactional link between the affective quality of teacher-student relations and students' externalizing behavior in upper elementary education. We studied teacher support and conflict separately and examined whether associations differed for boys and girls. Data were collected from 1452 Dutch fifth graders (Mage = 10.60 years) at three time points within one school year, including peer nominations of teacher-student relationships and external observations of teacher-student interactions. We used random-intercept cross-lagged panel models to examine the associations within the school year. Student behavior and teacher conflict and support were clearly interrelated within measurement moments. That is, within each time point, deviations from students' typical level of externalizing behavior were associated with deviations in teacher conflict and support in teacher-student relations. In contrast to earlier work, we found no transactional link between students' externalizing behavior and their relationships and interactions with their teacher over time, neither for teacher conflict nor for support. However, for boys, an association was found between externalizing behavior and later increased teacher conflict. We concluded that it remains important to invest in supportive teacher-student relations to prevent increasing conflict and that transactionality may occur within shorter time intervals.


Assuntos
Relações Interpessoais , Instituições Acadêmicas , Criança , Feminino , Humanos , Masculino , Grupo Associado , Professores Escolares/psicologia , Estudantes/psicologia
18.
Food Chem ; 382: 132306, 2022 Jul 15.
Artigo em Inglês | MEDLINE | ID: mdl-35134718

RESUMO

In this work, plant-based shakes were prepared (5% oil, 6% protein, 1% lecithin, 88% water) (w/w) using two processing techniques (i) only mixing versus (ii) mixing followed by high pressure homogenisation, as well as two processing sequences (i) adding all ingredients together versus (ii) stepwise addition of ingredients. Shakes only mixed consisted of large, irregular particles (1-100 µm). Eventually, this resulted in a relatively low lipid and protein digestion extent after 2 h of gastric pre-digestion (9% and < 1%, respectively). In contrast, shakes that were subjected to high pressure homogenisation displayed small, homogeneous particles (<10 µm). Besides, lipids and proteins were digested to a high extent in the stomach (40% and 10%, respectively). The small intestinal digestion kinetics indicated a significant impact of proteins on lipid digestion kineticsbutno significant effect of lipids on protein digestion kinetics. The results highlighted the relevance of food processing on macronutrient (micro)structure and further gastrointestinal functionality.


Assuntos
Digestão , Estômago , Emulsões/química , Cinética , Lipídeos/química
19.
J Appl Microbiol ; 110(5): 1252-61, 2011 May.
Artigo em Inglês | MEDLINE | ID: mdl-21332899

RESUMO

AIMS: To assess the survival of Mycobacterium avium ssp. paratuberculosis (MAP) in yoghurt and commercial fermented milk products containing probiotic strains. METHODS AND RESULTS: Whole and skimmed UHT milk artificially inoculated with MAP were used to manufacture yoghurt, using two different yoghurt starter cultures. Five commercial fermented milk products were inoculated with MAP. Two different MAP strains were studied. The survival of MAP in all products was monitored by culture over a 6-week storage period at 6°C. In yoghurt, MAP counts did not change appreciably during the storage period. Fat content and type of yoghurt starter culture had no consistent effect on the survival of MAP. In the fermented milk products, survival patterns varied but resulted in a 1·5 to ≥3·8 log reduction for the Niebüll strain and a 1·2-2·2 log reduction for the NIZO strain after 6 weeks, depending on the probiotic starters present in the product. CONCLUSIONS: MAP easily survived in yoghurt but MAP numbers decreased in fermented milk products containing probiotic cultures. SIGNIFICANCE AND IMPACT OF THE STUDY: The results contribute to the lack of knowledge on the behaviour of MAP in yoghurt and fermented milk products containing probiotic cultures. This knowledge is valuable in the context of the risk of MAP transmission to humans via yoghurt and the possible contribution of probiotic fermented milk products to the elimination of MAP.


Assuntos
Produtos Fermentados do Leite/microbiologia , Microbiologia de Alimentos , Mycobacterium avium subsp. paratuberculosis/crescimento & desenvolvimento , Probióticos , Iogurte/microbiologia , Animais , Bifidobacterium/crescimento & desenvolvimento , Contagem de Colônia Microbiana , Fermentação , Manipulação de Alimentos , Lactobacillus/crescimento & desenvolvimento , Viabilidade Microbiana , Refrigeração
20.
Food Res Int ; 141: 110087, 2021 03.
Artigo em Inglês | MEDLINE | ID: mdl-33641966

RESUMO

The presented research studied the emulsifying and emulsion stabilizing capacity of pectin samples isolated from different plant origin: apple, carrot, onion and tomato. The acid extracted pectin samples showed distinct structural properties. Specifically, apple pectin showed a high degree of methylesterification (78.41 ± 0.83%), carrot pectin had the lowest concentration of other co-eluted cell wall polymers, onion pectin displayed a bimodal molar mass distribution suggesting two polymer fractions with different molar mass and tomato pectin was characterized by a high protein content (16.48 ± 0.05%). The evaluation of the emulsifying and emulsion stabilizing potential of the pectin samples included investigating their ability to lower the interfacial tension next to a storage stability study of pectin stabilized o/w emulsions. Creaming behavior as well as the evolution of the oil droplet size were thoroughly examined during storage using multiple analytical techniques. Overall, smaller oil droplet sizes were obtained at pH 2.5 compared to pH 6.0 indicating better emulsifying capacity at lower pH. The lowest emulsion stability was observed in emulsions formulated with tomato pectin in which weak flocculation and relatively fast creaming affected emulsion stability. Onion pectin clearly showed the most promising emulsifying and emulsion stabilizing potential. At both pH conditions, emulsions stabilized by the onion pectin sample displayed highly stable oil droplet sizes during the whole storage period. The presence of the two polymer fractions in this sample can play an important role in the observed stability. In future work, it could be evaluated if both fractions contribute to emulsion stability in a synergistic way. In conclusion, this work showed that pectin samples extracted from different plant origin display diverse structural properties resulting in varying emulsifying and emulsion stabilizing potential. Polymer molar mass potentially plays a major role in the structure-function relation.


Assuntos
Pectinas , Emulsões , Peso Molecular , Tensão Superficial
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