Search results for "response"
showing 10 items of 4136 documents
Human neonatal responses to androstenone
2010
Poster P327 session VII: Olfactory Psychophysics & Clinical Studies; Central Olfaction; Aims. Human newborns show equal attraction to the odors of amniotic. fluid (AF) and mothers’ colostrum [1]. As 5-a-androst-16-en-3-. one (An) has been found in both fluids [2, 3], we studied it as a. potential vector of this perinatal odor continuity and of neonatal. attraction to the smell of breast and milk [4]. Methods. Two studies. were run. 1) We recorded the behavior of 16 newborns (3 days) and. 26 adults exposed to a saturating water solution of An and to 3. reference odorants [butyric acid, B; vanilla, V; water, W]. 2) We videotaped. 26 newborns (3 days) being administered 7 stimuli: 4 dilution. …
The role of maternal effects in host-parasite interactions: examination of the development of the immune defense in a colonial seabird, the black-leg…
2004
One of the main aims of evolutionary biology is to understand the mechanisms responsible for the phenotypic variation on which natural selection can act. Maternal effects occur when a mother's phenotype or her environment influence her offspring's phenotype. Despite the importance of such effects for the ecology of host-parasite interactions, their role has been relatively neglected to date. In this thesis, we examined how mothers influence the immune defense of their young in an environment that varies in space and time. This work has primarily focused on a colonial seabird, the black-legged kittiwake (Rissa tridactyla). Using this model, we have first shown that specific maternal antibodi…
Focusing on Ciona intestinalis (Tunicata) innate immune system. Evolutionary implications
2009
Phylogenetic analyses based on molecular data provide compelling evidence that ascidians are of critical importance for studying chordate immune system evolution. The Ciona intestinalis draft genome sequence allows searches for phylogenetic relationships, gene cloning and expression of immunorelevant molecules. Acidians lack of the pivotal components of the vertebrate recombinatory adaptive immunity, i.e., MHC, TCRs and dimeric immunoglobulins. However, bioinformatic sequence analyses recognized genic elements indicating the essential features of the Ig superfamily and ancestor proto-MHC genes, suggesting a primitive pre-duplication and pre-recombination status. C. intestinalis genes for in…
Negative responses to strategic innovation, a case study of record labels facing streaming
2021
Record labels are organizations in charge of phonographic production at the interface between musicians and the audience. Since the arrival of digital technologies such as the mp3 and the Internet, record labels have had to adapt to several changes: wider distribution channels, dematerialized competitors, customers’ demands for free music, more ephemeral cooperation. Specifically, streaming platforms like Spotify brought a major change known as a strategic innovation. A strategic innovation is a strong change that overturns all previously established values in the sector (renewal of values attached to the product, values attached to the customer relationship and power relations). However, f…
Tumour oxygenation during fractionated radiotherapy--comparison with size-matched controls.
1999
The effect of fractionated irradiation on the oxygenation status of experimental tumours was investigated using polarographic assessment of the pO2 distribution. Since an improvement in tumour oxygenation could simply be the result of tumour shrinkage, a comparison of pO2 readings of untreated size-matched control tumours was performed. Irradiation was carried out using 6 fractions of 6 Gy applied within 11 days. A comparison of polarographic pO2 data with size-matched untreated tumours revealed a significant improvement in oxygenation after the irradiation. The median pO2 was 0.9+/-0.1 mm Hg for unirradiated tumours at a volume of 180 mm3, while the corresponding data for irradiated tumour…
Accelerated Light-Induced Defect Transformation Study of Elkem Solar Grade Silicon
2012
AbstractSolar cells made of silicon feedstock from a metallurgical route must qualify not only the initial efficiency, but must also be comparable to the solar cells made from reference polysilicon on the spectral response after light induced degradation. A detailed comparative study of light induced defects and its impact on cell performance is necessary for both materials. We have studied accelerated light induced degradation (ALID) defect transformation for Elkem Solar Silicon and polysilicon solar cells by selecting wafers from different positions from respective silicon bricks. Active boron-oxygen complexes and iron ions in multicrystalline silicon solar cells have been analyzed, and t…
Effective Recovery Process of Copper from Waste Printed Circuit Boards Utilizing Recycling of Leachate
2020
AbstractThis study presents an optimized leaching and electrowinning process for the recovery of copper from waste printed circuit boards including studies of chemical consumption and recirculation of leachate. Optimization of leaching was performed using response surface methodology in diluted sulfuric acid and hydrogen peroxide media. Optimum leaching conditions for copper were found by using 3.6 mol L−1 sulfuric acid, 6 vol.% hydrogen peroxide, pulp density of 75 g L−1 with 186 min leaching time at 20°C resulting in complete leaching of copper followed by over 92% recovery and purity of 99.9% in the electrowinning. Study of chemical consumption showed total decomposition of hydrogen pero…
Inositol supplementation and IVF outcome: preliminary data
2012
Myo-Inositol (MI) is involved in several aspects of human reproduction. Elevated concentrations of myo-inositol in human follicular fluids, in fact, seem to play a positive role in follicular maturity, since to represent a possible marker of good oocyte quality. Nevertheless its positive role in PCOS patients is a consequence of a defect in the insulin signaling (inositol- containing phosphoglycan mediators) pathway that seems to be implicated in the pathogenesis of insulin resistance. The aim of this study was to analyze the effect of myo-inositol supplementation to “standard” therapy in PCOS women and in “poor responders”, submitted to In Vitro Fecundation (IVF) cycles. In particular, we …
Structural and functional diversity of Bacillus thuringiensis toxins on animal, plant and microbial cells
2018
Debido a los efectos nocivos de los insecticidas químicos en los ecosistemas y sobre los organismos beneficiosos, la implementación de agentes de control biológico ha recibido considerable atención. Entre los agentes de control biológico, se ha dedicado gran interés a los entomopatógenos, debido a su potencial para controlar plagas agrícolas y domésticas, vectores de enfermedades humanas y animales, sin introducir material no degradable en el medio ambiente. Bacillus thuringiensis (Bt) es el agente de control microbiano comercial más utilizado en la actualidad, con efectividad contra diferentes especies de insectos plaga. Las cepas de Bt producen cristales paraesporales proteináceos durante…
Interface model for the nonlinear analysis of blocky structures of ancient Greek temples
2010
The presence of singularity surfaces with reference to the displacement field is a characteristic of a number of structural systems. Strong discontinuities are present in old masonry structures where dry joints connect the blocks or the mortar ageing suggests to neglect the adhesion properties. These structures cannot be considered a continuum but rather an assembly of blocks. These discontinuous structures could be modelled as an assembly of blocks interacting trough frictional joints whose mechanical behaviour is described by appropriate interface laws. In the present work an interface model present in literature is adopted, the double asperity model, which has been implemented in a stand…