Search results for "fluid"

Neutral volatile compounds in the raw milks from different species

1993

SummaryA comparative study was carried out on the flavour constituents of bovine, ovine, caprine and water buffalo fresh raw milks. The volatiles were isolated from milks by means of vacuum distillation and liquid–liquid extraction. Eighty neutral volatile compounds were identified using high resolution gas chromatography (HRGC) and HRGC-mass spectrometry. About 30 of these components have not been detected previously in milk. The volatiles in milk were similar for the four species, although several quantitative differences might explain the different odours. The volatiles consisted mainly of ethyl esters, especially those derived from butyric and hexanoic acids. Dimethylsulphone alone comp…

La membrane plasmique des plantes : une clé dans la détection des agresseurs et le processus de défensefra

2014

SPE IPM; Le développement d’une méthode d’imagerie innovante a permis de montrer que la membrane plasmique des cellules végétales est une mosaïque de territoires présentant des propriétés biophysiques variées. Cette organisation est modifiée de façon très rapide en réponse à certaines molécules provenant de microorganismes, établissant un lien fonctionnel entre cette organisation et la mise en place des mécanismes de défense.

Utilisation de la technique du FRAP pour évaluer la fluidité de la membrane plasmique de cellules végétales en suspension

2014

Cerebrospinal fluid pharmacokinetics of ceftaroline in neurosurgical patients with external ventricular drain

2018

International audience; Background: Due to its antibacterial properties ceftaroline could be attractive for the treatment of bacterial postneurosurgicalmeningitis. However only few data are available concerning its meningeal concentrations. The aim of this studywas to investigate ceftaroline cerebrospinal fluid (CSF) pharmacokinetics (PK) in intensive care unit (ICU) patients with anexternal ventricular drain (EVD).Materials/methods: Patients received a single 600 mg dose of ceftaroline as a one-hour intravenous infusion . Blood and CSFsamples were collected before and 0.5, 1, 3, 6, 12 and 24 hours after the end of the infusion. Concentrations were assayed inplasma and CSF by LC-MS/MS. A tw…

Immobilization of murine noroviruses in a cultivated phaeozem soil and its reversibility

2017

Immobilization of murine noroviruses in a cultivated phaeozem soil and its reversibility. Environmental Microbiology & Microbial Ecology

Pushing the limits of STEC molecular risk assessment: identification of genes specifically induced in vivo as potential new genetic biomarkers

2017

National audience; Epidemiologic studies reveal that only few virulence factors are frequently associated with Shiga toxin-producing Escherichia coli (STEC) strains that cause severe disease in humans. Among them, Shiga toxins (Stx) is required for the development of the most severe symptoms in STEC infected patients but is not strictly sufficient to make an E. coli strain pathogenic to human. Indeed, many STEC strains isolated from rearing animals have never been implicated in human disease. It therefore appears crucial to increase our knowledge on STEC pathogenesis at the molecular level. We developed a RIVET (Recombination-based in vivo expression technology) strategy in order to identif…

Melting of sediments in the deep mantle produces saline fluid inclusions in diamonds.

2019

We demonstrate the formation of highly saline mantle fluids by the reaction of subducted sediment with peridotite.

Guiding and confinement of interface acoustic waves in solid-fluid pillar-based phononic crystals

2016

International audience; Pillar-based phononic crystals exhibit some unique wave phenomena due to the interaction between surface acoustic modes of the substrate and local resonances supported by pillars. In this paper, we extend the investigations by taking into account the presence of a liquid medium. We particularly demonstrate that local resonances dramatically decrease the phase velocity of Scholte-Stoneley wave, which leads to a slow wave at the solid/fluid interface. Moreover, we show that increasing the height of pillars introduces a new set of branches of interface modes and drastically affects the acoustic energy localization. Indeed, while some modes display a highly confined pres…

The mKdV equation and multi-parameters rational solutions

2021

Abstract N -order solutions to the modified Korteweg–de Vries (mKdV) equation are given in terms of a quotient of two wronskians of order N depending on 2 N real parameters. When one of these parameters goes to 0, we succeed to get for each positive integer N , rational solutions as a quotient of polynomials in x and t depending on 2 N real parameters. We construct explicit expressions of these rational solutions for orders N = 1 until N = 6 .

Acoustic properties of plates with unevenly distributed macro perforations backed by woven meshes

2012

A hybrid model describing the acoustic properties of plates with macro-perforations that can be unevenly distributed on the plate surface and backed by woven or precision woven meshes with microscopic perforations is proposed. The plate perforations may be of circular or rectangular shapes. Since the perforated plate may not necessarily be considered as an equivalent fluid, its surface impedance is calculated by the Maa model [Noise Control Eng. J. 29, 77-84 (1987)], whereas the Johnson-Champoux-Allard model [J. Appl. Phys. 70, 1975-1979 (1991)] is used for the mesh. It is observed that the absorption of the carrying plate seems to depend on the hydraulic diameter of the perforations and no…