Search results for "Bioengineering"

Protection of living yeast cells by micro-organized shells of natural polyelectrolytes

2015

International audience; Saccharomyces cerevisiae, a eukaryotic model organism, plays a key role in the oxidative stability of fermented products. In order to protect cells against environmental stresses, we report a method of modifying the cell surface architecture while maintaining the internal working properties of the system. The objective was to encapsulate living yeast cells in micro-organized polyelectrolyte shells using layer-by-layer (LbL) assembly. For the first time, the natural polyelectrolytes, β-lactoglobulin and sodium alginate, were alternately deposited on the surface of S. cerevisiae. Transmission electron microscopy coupled with immune-cytochemistry and scanning electron m…

Quorum Sensing effects on Pseudomonas corrugata plant interaction and antagonistic activity

2010

Thermotolerance in Saccharomyces cerevisiae is linked to resistance to anhydrobiosis

2014

Abstract We have demonstrated that a thermotolerant yeast strain ( Saccharomyces cerevisiae TS1) is much more resistant to dehydration–rehydration treatments than a mesophilic strain of S. cerevisiae . Yeast resistance to dehydration–rehydration was found to be similar in cells from exponential and stationary growth phases. Under controlled rehydration conditions involving gradual rehydration in water vapour, yeast cell viability was maintained at 90–95%. When S. cerevisiae TS1 cells were pre-grown at 37 °C and then dried, controlled rehydration lead to restoration of plasma membrane integrity, indicating important differences in cell envelope architechture of mesophilic and thermotolerant …

The effect of nickel on seed germination and plant sprouting in the case of some Alyssum species

2015

The aim of the researches was to establish the upper limit of nickel concentration in soils that the Alyssum maritimum and Alyssum murale species could tolerate without significantly affecting the germination and the plant sprouting process. The experiment was conducted in 4 variants of 3 repetitions, each repetition including 50 seeds. The watering process of the substrate was performed using distilled water for the control variant (M) and NiSO4 solutions that represented the intervention threshold (V1 – 150 mg/kg) and doses that exceeded the intervention threshold (V2 – 350 mg/kg; V3 – 550 mg/kg and V4 – 750 mg/kg). The Ni influence on seed germination was assessed based on sprouting perc…

Sunflower Residues-Based Biorefinery: Circular Economy Indicators

2023

Fossil fuel price increases, their uneven distribution, environmental issues from their incineration, and lack of guarantees of their energy security are the main drivers for the development of green energy. Agricultural waste is an abundant resource for energy bioprocessing, which improves the functioning of the circular economy. In this study, the following were used as the main indicators: the share of renewable energy and the benefit from it, the coefficient of cyclical use of biomass, and the reduction in carbon dioxide emissions. The ways in which sunflower waste is applied for energy purposes are emphasized. The highest comprehensive ecological and economic effects are shown to be ac…

Tailoring Third-Harmonic Diffraction Efficiency by Hybrid Modes in High-Q Metasurfaces

2021

Metasurfaces are versatile tools for manipulating light; however, they have received little attention as devices for the efficient control of nonlinearly diffracted light. Here, we demonstrate nonlinear wavefront control through third-harmonic generation (THG) beaming into diffraction orders with efficiency tuned by excitation of hybrid Mie-quasi-bound states in the continuum (BIC) modes in a silicon metasurface. Simultaneous excitation of the high-Q collective Mie-type modes and quasi-BIC modes leads to their hybridization and results in a local electric field redistribution. We probe the hybrid mode by measuring far-field patterns of THG and observe the strong switching between (0,-1) and…

Haematopoietic stem cell transplantation in the treatment of autoimmune diseases: current experience from an international data base.

2000

Prolonged Response of Chronic Immune Thrombocytopenic Purpura (ITP) to Extracorporeal Immunoadsorption

2000

Quo vadis nanomedicine?

2015

The interdisciplinary workshop ‘Quo Vadis Nanomedicine?’ was held on 10–11 April 2014 at the University of Exeter (Exeter, UK), coorganized by the Schumpeter-Research Group ‘Innovations in Nanomedicine’, funded by the VolkswagenStiftung at Exeter University, and the Sonderforschungsbereich (STB; collaborative research centre) 1066 ‘Nanodimensional Polymer Therapeutics for Tumor Therapy’, funded by the German Research Council (DFG) at the Johannes Gutenberg-University (Mainz, Germany). This international workshop brought together scientists, philosophers and social scientists in order to reflect, discuss and rethink the practices, concepts, methods, models and metaphors, as well as the medi…

Immediate non-submerged implants with laser-microtextured collar placed in the inter-radicular septum of mandibular molar extraction sockets associat…

2019

Background The aim of the present study was to radiographically evaluate the vertical socket walls changes, and the peri-implant marginal bone remodelling, and clinicallly the soft tissues conditions around the non-submerged single implants placed into the inter radicular septum of mandibular molar sockets, associated with a collagen membrane, after 3 years of loading. Material and Methods Thirty patients underwent to placement of a non-submerged implants with a laser-microtextured collar into the inter radicular septum of mandibular molar fresh extraction sockets. A collagen membrane and the mucoperiosteal flap were adapted around the neck of the implants, leaving the laser-microtextured c…