26 research outputs found
High-resolution error detection in the capture process of a single-electron pump
The dynamic capture of electrons in a semiconductor quantum dot (QD) by raising a potential
barrier is a crucial stage in metrological quantized charge pumping. In this work, we use a quantum
point contact (QPC) charge sensor to study errors in the electron capture process of a QD formed in
a GaAs heterostructure. Using a two-step measurement protocol to compensate for 1/f noise in the
QPC current, and repeating the protocol more than 106 times, we are able to resolve errors with
probabilities of order 106. For the studied sample, one-electron capture is affected by errors in
30 out of every million cycles, while two-electron capture was performed more than 106 times
with only one error. For errors in one-electron capture, we detect both failure to capture an electron
and capture of two electrons. Electron counting measurements are a valuable tool for investigating
non-equilibrium charge capture dynamics, and necessary for validating the metrological accuracy
of semiconductor electron pumps
International Lower Limb Collaborative (INTELLECT) study : a multicentre, international retrospective audit of lower extremity open fractures
Strong detection of the CMB lensing and galaxy weak lensing cross-correlation from ACT-DR4, Planck Legacy, and KiDS-1000
Large scale structure and cosmolog
Strong detection of the CMB lensing and galaxy weak lensing cross-correlation from ACT-DR4, Planck Legacy, and KiDS-1000
Large scale structure and cosmolog
Solos sob vegetação de restinga na Ilha do Cardoso (SP): I - Caracterização e classificação
Nutritional intervention during gestation alters growth, body composition and gene expression patterns in skeletal muscle of pig offspring
peer-reviewedVariations in maternal nutrition during gestation can influence foetal growth, foetal development and permanently ‘programme’
offspring for postnatal life. The objective of this study was to analyse the effect of increased maternal nutrition during different
gestation time windows on offspring growth, carcass quality, meat quality and gene expression in skeletal muscle. A total of 64
sows were assigned to the following feeding treatments: a standard control diet at a feed allocation of 2.3 kg/day throughout
gestation, increased feed allowance of 4.6 kg/day from 25 to 50 days of gestation (dg), from 50 to 80 dg and from 25 to 80 dg.
At weaning, Light, Medium and Heavy pigs of the same gender, within litter, were selected based on birth weight, individually
penned and monitored until slaughter at 130 days post weaning. Carcass and meat quality traits of the semimembranosus (SM) muscle were recorded post mortem. A cross section of the semitendinosus (ST) muscle encompassing the deep and superficial
regions were harvested from pigs (n518 per treatment) for RNA extraction and quantification of gene expression by real-time PCR. The results showed that doubling the feed intake from 25 to 50 dg reduced offspring growth, carcass weight, intramuscular fat content and increased drip loss of the SM muscle. Interestingly, protein phosphatase 3 catalytic subunit – a-isoform, which codes for the transcription factor calcineurin, was upregulated in the ST muscle of offspring whose mothers received increased feed allowance from 25 to 50 dg. This may provide an explanation for the previous observed increases in Type IIa muscle fibres of these offspring. Increasing the maternal feed intake from 50 to 80 dg negatively impacted pig growth and carcass weight, but produced leaner male pigs. Extending the increased maternal feed intake from 25 to 80 dg had no effect on offspring over the standard control gestation diet. Although intra-litter variation in pig weight is a problem for pig producers, increased maternal feeding offered no improvement throughout life to the lighter birth weight littermates in our study. Indeed, increased maternal nutrition at the three-gestation time windows selected provided no major benefits to the offspring.Teagasc, under the National Development Plan;
Teagasc Walsh Fellowship; Short Term Scientific Mission (STSM) fund, COST925