ORCID Profile
0000-0003-1053-8827
Current Organisations
USPCAS-E, NUST, H-12, Islamabad.
,
CSIRO Clayton
,
Monash University
,
CSIRO
Does something not look right? The information on this page has been harvested from data sources that may not be up to date. We continue to work with information providers to improve coverage and quality. To report an issue, use the Feedback Form.
Publisher: Cold Spring Harbor Laboratory
Date: 07-10-2022
DOI: 10.1101/2022.10.06.510603
Abstract: Assisted reproductive technologies (ART) may perturb DNA methylation (DNAm) in early embryonic development. Although a handful of epigenome-wide association studies of ART have been published, none have investigated CpGs on the X chromosome. To bridge this knowledge gap, we leveraged one of the largest collections of mother-father-newborn trios of ART and non-ART (natural) conceptions to date to investigate DNAm differences on the X chromosome. The discovery cohort consisted of 982 ART and 963 non-ART trios from the Norwegian Mother, Father, and Child Cohort Study (MoBa). The replication cohort consisted of 149 ART and 58 non-ART neonates from the Australian “Clinical review of the Health of adults conceived following Assisted Reproductive Technologies” (CHART) study. The Illumina EPIC array was used to measure DNA methylation (DNAm) in both datasets. In the MoBa cohort, we performed a set of X-chromosome-wide association studies (“XWASs” hereafter) to search for sex-specific DNAm differences between ART and non-ART newborns. We tested several models to investigate the influence of various confounders, including parental DNAm. We also searched for differentially methylated regions (DMRs) and regions of co-methylation flanking the most significant CpGs. For replication purposes, we ran an analogous model to our main model on the CHART dataset. In the MoBa cohort, we found more differentially methylated CpGs and DMRs in girls than boys. Most of the associations persisted even after controlling for parental DNAm and other confounders. Many of the significant CpGs and DMRs were in gene-promoter regions, and several of the genes linked to these CpGs are expressed in tissues relevant for both ART and sex (testis, placenta, and fallopian tube). We found no support for parental infertility as an explanation for the observed associations in the newborns. The most significant CpG in the boys-only analysis was in UBE2DNL , which is expressed in testes but with unknown function. The most significant CpGs in the girls-only analysis were in EIF2S3 and AMOT . These three loci also displayed differential DNAm in the CHART cohort. Overall, genes that co-localized with the significant CpGs and DMRs are implicated in several key biological processes (e.g., neurodevelopment) and disorders (e.g., intellectual disability and autism. These connections are particularly compelling in light of previous findings indicating that neurodevelopmental outcomes differ in ART-conceived children compared to naturally-conceived.
Publisher: American Chemical Society (ACS)
Date: 28-10-2014
DOI: 10.1021/SC500642C
Publisher: Royal Society of Chemistry (RSC)
Date: 2014
DOI: 10.1039/C4RA04828H
Abstract: Photovoltaic property (an efficiency of 7.92%) of the cabbage-leaf-like TiO 2 mesostructures synthesized from electrospun TiO 2 –SiO 2 composite nanofibers by a modified titanate route.
Publisher: Royal Society of Chemistry (RSC)
Date: 2018
DOI: 10.1039/C8TC01552J
Abstract: A novel optical fibre-based sensor utilising photoluminescence quenching in methylammonium lead halides upon exposure to ammonia is demonstrated.
Publisher: Wiley
Date: 23-05-2017
Publisher: Wiley
Date: 17-07-2022
Abstract: The search for lead‐free alternatives to lead‐halide perovskite photovoltaic materials resulted in the discovery of copper(I)‐silver(I)‐bismuth(III) halides exhibiting promising properties for optoelectronic applications. The present work demonstrates a solution‐based synthesis of uniform Cu x AgBiI 4+ x thin films and scrutinizes the effects of x on the phase composition, dimensionality, optoelectronic properties, and photovoltaic performance. Formation of pure 3D CuAgBiI 5 at x = 1, 2D Cu 2 AgBiI 6 at x = 2, and a mix of the two at 1 x 2 is demonstrated. Despite lower structural dimensionality, Cu 2 AgBiI 6 has broader optical absorption with a direct bandgap of 1.89 ± 0.05 eV, a valence band level at ‐5.25 eV, improved carrier lifetime, and higher recombination resistance as compared to CuAgBiI 5 . These differences are mirrored in the power conversion efficiencies of the CuAgBiI 5 and Cu 2 AgBiI 6 solar cells under 1 sun of 1.01 ± 0.06% and 2.39 ± 0.05%, respectively. The latter value is the highest reported for this class of materials owing to the favorable film morphology provided by the hot‐casting method. Future performance improvements might emerge from the optimization of the Cu 2 AgBiI 6 layer thickness to match the carrier diffusion length of ≈40–50 nm. Nonencapsulated Cu 2 AgBiI 6 solar cells display storage stability over 240 days.
Publisher: Royal Society of Chemistry (RSC)
Date: 2014
DOI: 10.1039/C4RA04226C
Abstract: Titanium dioxide (TiO 2 ) synthesized by freeze drying of a TiO 2 precursor–polyester composite followed by sintering and its performance when employed in dye-sensitized solar cells.
Publisher: Royal Society of Chemistry (RSC)
Date: 2019
DOI: 10.1039/C9CC05753F
Abstract: The phase transition temperature of formamidinium-based perovskites can be dramatically reduced through the incorporation of γ-butyrolactone (GBL).
Publisher: Royal Society of Chemistry (RSC)
Date: 2020
DOI: 10.1039/C9TA10422D
Abstract: Light harvesting capacity of caesium silver bismuth bromide double perovskite need to be enhanced to render this non-toxic and thermodynamically stable material suitable for photovoltaic applications, for ex le as a top layer in tandem solar cells.
Publisher: Wiley
Date: 19-06-2018
Abstract: Invited for this month's cover are the groups of Prof. Dr. Udo Bach, Prof. Dr. Yi-Bing Cheng, and Prof. Dr. Leone Spiccia (Monash University, Australia), and Dr. Mingkui Wang (Huazhong University of Science and Technology, China). The cover picture shows the charge-transfer processes between a novel porphyrin dye adsorbed on nickel oxide and tris(acetylacetonato) iron(III/II) redox mediator after excitation by sunlight. Read the full text of the article at 10.1002/cplu.201800104.
Publisher: Royal Society of Chemistry (RSC)
Date: 2018
DOI: 10.1039/C8EE00754C
Abstract: A facile method to produce metal halide perovskite solar cells with improved stability and efficiency.
Publisher: Royal Society of Chemistry (RSC)
Date: 2014
DOI: 10.1039/C4RA03701D
Abstract: An innovative one-dimensional nanoarchitecture having TiO 2 nanoparticles decorating a TiO 2 nanofiber surface fabricated by simultaneous electrospinning–electrospraying technique as a photoanode for dye-sensitized solar cells.
Publisher: Royal Society of Chemistry (RSC)
Date: 2014
DOI: 10.1039/C4RA01883D
Abstract: The photovoltaic performance of a dye-sensitized solar cell module (12 cm × 12 cm) fabricated by spray pyrolysis deposition (SPD) of a TiO 2 colloid.
Publisher: Springer Science and Business Media LLC
Date: 13-05-2019
Publisher: Wiley
Date: 14-06-2018
Publisher: American Chemical Society (ACS)
Date: 13-07-2022
Publisher: Wiley
Date: 02-05-2017
Abstract: Design of novel efficient light-harvesters for p-type dye-sensitised solar cells (DSSCs) is indispensable for further advances in this photovoltaic technology. Herein, a novel D-π-A (D=donor, π=π-conjugated linker, A=acceptor) sensitiser, ZnP1, featuring an electron acceptor, perylenemonoimide (PMI), connected to an electron donor, di(p-carboxyphenyl)amine (DCPA), through fluorene and a zinc(II) porphyrin with alkyl chains as a π-conjugated bridge is introduced. Spectroscopic and electrochemical characterisation of this dye along with a newly synthesised PMI-free reference dye ZnP0 has been undertaken to demonstrate strong electron coupling between the DCPA donor and PMI acceptor subunits through the porphyrin ring in ZnP1, which redshifts the light absorption onset to the near-IR region. When integrated into p-DSSCs based on a mesoporous nickel(II) oxide semiconductor electrode and a tris(acetylacetonato) iron(III/II) redox mediator, ZnP1 exhibits an onset of the incident photon-to-current conversion efficiency at 800 nm and a power conversion efficiency of up to 0.92 % under simulated 100 mW cm
Publisher: Wiley
Date: 05-05-2021
DOI: 10.1002/ESE3.901
Abstract: The efficiency of DC microgrid needs investigation from a smart grid perspective, since their spread has expected to prevail in comparison with AC counterparts. Furthermore, there is a need to address the limitations (majorly to cater the intermittency of distributed energy resources (DERs) as well as the time dependency of systematic parameters etc.) in previous model and propose a new mathematical model to evaluate system efficiency for given parameters and scenarios. The core focus of current study aims at formulation of an improved (composite) mathematical model, that is capable of bridging issues and serve as a tool to address requirements of future DC systems including microgrids (MGs) and multi‐microgrids (MMGs). This research work offers such a mathematical model that consists of 3D matrices based on newly derived set of discrete time dependent equations, which evaluates the system efficiency of residential DC‐MMGs. Each DC‐MG is embedded with intermittent DERs, storage, components (with efficiency variations), and multi‐class load (with discrete time dependency), for evaluation across worst, normal, and best scenarios. A comprehensive sensitivity analysis across various cases and respective scenarios are also presented to evaluate overall system performance. Also, the impacts of system parameters on various system variables, states, and overall system efficiency have presented in this paper.
Publisher: American Chemical Society (ACS)
Date: 23-03-2022
DOI: 10.1021/ACS.JPCLETT.2C00278
Abstract: Spontaneous enhancement of the photovoltaic performance of perovskite solar cells (PSCs) after aging has been reported, but the underlying reasons for such behavior are still under debate. Herein, we demonstrate that this spontaneous improvement effect accompanied by self-attenuation of hysteresis in the current-voltage characteristics is time- and temperature-dependent. Moreover, it is universal to PSCs based on a range of mixed-ion perovskites and coupled to different hole- and electron-transporting materials. Time-resolved confocal fluorescence microscopy and other characterization techniques suggest that the "self-healing" phenomenon is accompanied by the homogenization and enhancement of the charge extraction efficiency as well as suppressed recombination throughout cm
Publisher: American Chemical Society (ACS)
Date: 21-07-2019
DOI: 10.1021/ACS.JPCLETT.9B01783
Abstract: Chemical doping is a ubiquitously applied strategy to improve the charge-transfer and conductivity characteristics of spiro-OMeTAD, a hole-transporting material (HTM) used widely in solution-processed perovskite solar cells (PSCs). Cobalt(III) complexes are commonly employed HTM dopants, whose major role is to oxidize spiro-OMeTAD to provide
Publisher: Royal Society of Chemistry (RSC)
Date: 2018
DOI: 10.1039/C7TC05711C
Abstract: Spray-deposited AgBiS 2 films are introduced as light-harvesters in planar solar cells that demonstrate up to 18 mA cm −2 short-circuit current density under 1 sun irradiation.
Publisher: Wiley
Date: 22-05-2017
Abstract: The formation of mixed-metal sulfides with the general structure AgBiS
Publisher: Wiley
Date: 14-12-2018
Location: Australia
No related grants have been discovered for Narendra Pai.