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21
result(s) for
"Patel, P.D."
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A Study of Raman Spectra and Photo Response Parameters of (InxSn1–x)Se2 Crystals
2025
Layered chalcogenide materials (LCMs) are emerging materials in recent years for its much more potential for application in photonics. As a member of the LCM family, SnSe2 is explored with a band gap of nearer to 1.2 eV semiconducting material. In this research work, direct vapour transport method has been used to synthesize pristine SnSe2 and Indium doped SnSe2. Raman spectra analysis were conducted on SnSe2 and (InxSn1–x)Se2 crystals. The photo switches on/off ratio under LED illumination intensities 50 mW/cm2 and 75 mW/cm2to obtain photo response parameters for high-performance photo conducting devices.
Journal Article
Temporal variability of glucocorticoid receptor activity is functionally important for the therapeutic action of fluoxetine in the hippocampus
Previous studies have shown inconsistent results regarding the actions of antidepressants on glucocorticoid receptor (GR) signalling. To resolve these inconsistencies, we used a lentiviral-based reporter system to directly monitor rat hippocampal GR activity during stress adaptation. Temporal GR activation was induced significantly by acute stress, as demonstrated by an increase in the intra-individual variability of the acute stress group compared with the variability of the non-stress group. However, the increased intra-individual variability was dampened by exposure to chronic stress, which was partly restored by fluoxetine treatment without affecting glucocorticoid secretion. Immobility in the forced-swim test was negatively correlated with the intra-individual variability, but was not correlated with the quantitative GR activity during fluoxetine therapy; this highlights the temporal variability in the neurobiological links between GR signalling and the therapeutic action of fluoxetine. Furthermore, we demonstrated sequential phosphorylation between GR (S224) and (S232) following fluoxetine treatment, showing a molecular basis for hormone-independent nuclear translocation and transcriptional enhancement. Collectively, these results suggest a neurobiological mechanism by which fluoxetine treatment confers resilience to the chronic stress-mediated attenuation of hypothalamic–pituitary–adrenal axis activity.
Journal Article
Stress-induced changes in primate prefrontal profiles of gene expression
by
Patel, P D
,
Li, J Z
,
Akil, H
in
Animals
,
Behavioral Sciences
,
Biological and medical sciences
2007
Stressful experiences that consistently increase cortisol levels appear to alter the expression of hundreds of genes in prefrontal limbic brain regions. Here, we investigate this hypothesis in monkeys exposed to intermittent social stress-induced episodes of hypercortisolism or a no-stress control condition. Prefrontal profiles of gene expression compiled from Affymetrix microarray data for monkeys randomized to the no-stress condition were consistent with microarray results published for healthy humans. In monkeys exposed to intermittent social stress, more genes than expected by chance appeared to be differentially expressed in ventromedial prefrontal cortex compared to monkeys not exposed to adult social stress. Most of these stress responsive candidate genes were modestly downregulated, including ubiquitin conjugation enzymes and ligases involved in synaptic plasticity, cell cycle progression and nuclear receptor signaling. Social stress did not affect gene expression beyond that expected by chance in dorsolateral prefrontal cortex or prefrontal white matter. Thirty four of 48 comparisons chosen for verification by quantitative real-time polymerase chain reaction (qPCR) were consistent with the microarray-predicted result. Furthermore, qPCR and microarray data were highly correlated. These results provide new insights on the regulation of gene expression in a prefrontal corticolimbic region involved in the pathophysiology of stress and major depression. Comparisons between these data from monkeys and those for ventromedial prefrontal cortex in humans with a history of major depression may help to distinguish the molecular signature of stress from other confounding factors in human postmortem brain research.
Journal Article
Gene expression profiling to predict the risk of locoregional recurrence in breast cancer: a pooled analysis
2014
The 70-gene signature (MammaPrint™) has been developed to predict the risk of distant metastases in breast cancer and select those patients who may benefit from adjuvant treatment. Given the strong association between locoregional and distant recurrence, we hypothesize that the 70-gene signature will also be able to predict the risk of locoregional recurrence (LRR). 1,053 breast cancer patients primarily treated with breast-conserving treatment or mastectomy at the Netherlands Cancer Institute between 1984 and 2006 were included. Adjuvant treatment consisted of radiotherapy, chemotherapy, and/or endocrine therapy as indicated by guidelines used at the time. All patients were included in various 70-gene signature validation studies. After a median follow-up of 8.96 years with 87 LRRs, patients with a high-risk 70-gene signature (
n
= 492) had an LRR risk of 12.6 % (95 % CI 9.7–15.8) at 10 years, compared to 6.1 % (95 % CI 4.1–8.5) for low-risk patients (
n
= 561;
P
< 0.001). Adjusting the 70-gene signature in a competing risk model for the clinicopathological factors such as age, tumour size, grade, hormone receptor status, LVI, axillary lymph node involvement, surgical treatment, endocrine treatment, and chemotherapy resulted in a multivariable HR of 1.73 (95 % CI 1.02–2.93;
P
= 0.042). Adding the signature to the model based on clinicopathological factors improved the discrimination, albeit non-significantly [
C
-index through 10 years changed from 0.731 (95 % CI 0.682–0.782) to 0.741 (95 % CI 0.693–0.790)]. Calibration of the prognostic models was excellent. The 70-gene signature is an independent prognostic factor for LRR. A significantly lower local recurrence risk was seen in patients with a low-risk 70-gene signature compared to those with high-risk 70-gene signature.
Journal Article
Assessing Impact of Climate Change on Rainfall Patterns of Vadodara District, Gujarat, India
2021
Due to climate change, variable rainfall pattern and rapid urbanization during last two decades, Vadodara district is frequently facing problems related to flooding. In present research paper frequency Analysis is carried from the available hydrometeorologicalhistorical rainfall data series of past four decades for Vadodara District, Gujarat. Rainbow software is used to carry out the analysis. Homogeneity of data is checked and Goodness-of-fit is tested. A logarithm transformation is selected to plot magnitude of event and corresponding probabilities of exceedance. The mixed Global probability distribution is used to explore the re-occurrence of rainfall events with certain return period. Analysis revealed that the rainfall events causing extreme flooding conditions in Vadodara District has frequency of re-occurrence as 25 years.
Journal Article
Combination and QCD analysis of charm and beauty production cross-section measurements in deep inelastic ep scattering at HERA
by
Jung, H
,
Libov, V
,
Picuric, I
in
Charm (particle physics)
,
Inelastic scattering
,
Momentum transfer
2018
Measurements of open charm and beauty production cross sections in deep inelastic ep scattering at HERA from the H1 and ZEUS Collaborations are combined. Reduced cross sections are obtained in the kinematic range of negative four-momentum transfer squared of the photon 2.5GeV2≤Q2≤2000GeV2 and Bjorken scaling variable 3·10-5≤xBj≤5·10-2. The combination method accounts for the correlations of the statistical and systematic uncertainties among the different datasets. Perturbative QCD calculations are compared to the combined data. A next-to-leading order QCD analysis is performed using these data together with the combined inclusive deep inelastic scattering cross sections from HERA. The running charm- and beauty-quark masses are determined as mc(mc)=1.290-0.041+0.046(exp/fit)-0.014+0.062(model)-0.031+0.003(parameterisation) GeV and mb(mb)=4.049-0.109+0.104(exp/fit)-0.032+0.090(model)-0.031+0.001(parameterisation)GeV.
Journal Article
Elastic and proton-dissociative photoproduction of J/ψ mesons at HERA
by
Contreras, J. G.
,
Ferencei, J.
,
Gayler, J.
in
Astronomy
,
Astrophysics and Cosmology
,
Collisions
2013
Cross sections for elastic and proton-dissociative photoproduction of
J
/
ψ
mesons are measured with the H1 detector in positron-proton collisions at HERA. The data were collected at
ep
centre-of-mass energies
and
, corresponding to integrated luminosities of
and
, respectively. The cross sections are measured as a function of the photon-proton centre-of-mass energy in the range 25<
W
γp
<110 GeV. Differential cross sections d
σ
/d
t
, where
t
is the squared four-momentum transfer at the proton vertex, are measured in the range |
t
|<1.2 GeV
2
for the elastic process and |
t
|<8 GeV
2
for proton dissociation. The results are compared to other measurements. The
W
γp
and
t
-dependences are parametrised using phenomenological fits.
Journal Article
Impact of jet-production data on the next-to-next-to-leading-order determination of HERAPDF2.0 parton distributions
2022
The HERAPDF2.0 ensemble of parton distribution functions (PDFs) was introduced in 2015. The final stage is presented, a next-to-next-to-leading-order (NNLO) analysis of the HERA data on inclusive deep inelastic ep scattering together with jet data as published by the H1 and ZEUS collaborations. A perturbative QCD fit, simultaneously of αs(MZ2) and the PDFs, was performed with the result αs(MZ2)=0.1156±0.0011(exp)-0.0002+0.0001(model+parameterisation)±0.0029(scale). The PDF sets of HERAPDF2.0Jets NNLO were determined with separate fits using two fixed values of αs(MZ2), αs(MZ2)=0.1155 and 0.118, since the latter value was already chosen for the published HERAPDF2.0 NNLO analysis based on HERA inclusive DIS data only. The different sets of PDFs are presented, evaluated and compared. The consistency of the PDFs determined with and without the jet data demonstrates the consistency of HERA inclusive and jet-production cross-section data. The inclusion of the jet data reduced the uncertainty on the gluon PDF. Predictions based on the PDFs of HERAPDF2.0Jets NNLO give an excellent description of the jet-production data used as input.
Journal Article
Measurement of the inclusive e±p scattering cross section at high inelasticity y and of the structure function FL
by
Contreras, J. G.
,
Gayler, J.
,
Loktionova, N.
in
Astronomy
,
Astrophysics and Cosmology
,
Elementary Particles
2011
A measurement is presented of the inclusive neutral current
e
±
p
scattering cross section using data collected by the H1 experiment at HERA during the years 2003 to 2007 with proton beam energies
E
p
of 920, 575, and 460 GeV. The kinematic range of the measurement covers low absolute four-momentum transfers squared, 1.5 GeV
2
<
Q
2
<120 GeV
2
, small values of Bjorken
x
, 2.9⋅10
−5
<
x
<0.01, and extends to high inelasticity up to
y
=0.85. The structure function
F
L
is measured by combining the new results with previously published H1 data at
E
p
=920 GeV and
E
p
=820 GeV. The new measurements are used to test several phenomenological and QCD models applicable in this low
Q
2
and low
x
kinematic domain.
Journal Article
Measurement of leading neutron production in deep-inelastic scattering at HERA
by
Contreras, J. G.
,
Gayler, J.
,
Loktionova, N.
in
Astronomy
,
Astrophysics and Cosmology
,
Cross sections
2010
The production of leading neutrons, where the neutron carries a large fraction
x
L
of the incoming proton’s longitudinal momentum, is studied in deep-inelastic positron-proton scattering at HERA. The data were taken with the H1 detector in the years 2006 and 2007 and correspond to an integrated luminosity of 122 pb
−1
. The semi-inclusive cross section is measured in the phase space defined by the photon virtuality 6<
Q
2
<100 GeV
2
, Bjorken scaling variable 1.5⋅10
−4
<
x
<3⋅10
−2
, longitudinal momentum fraction 0.32<
x
L
<0.95 and neutron transverse momentum
p
T
<0.2 GeV. The leading neutron structure function,
, and the fraction of deep-inelastic scattering events containing a leading neutron are studied as a function of
Q
2
,
x
and
x
L
. Assuming that the pion exchange mechanism dominates leading neutron production, the data provide constraints on the shape of the pion structure function.
Journal Article