Browsing Faculty of Natural Sciences by Title
Now showing items 895-914 of 2567
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The frequency of very young galaxies in the local Universe – II. The view from SDSS spectra
(Oxford University Press, 2019)Only a handful of galaxies in the local Universe appear to be very young. We estimate the fraction of very young galaxies (VYGs), defined as those with more than half their stellar masses formed within the last Gyr. We fit ... -
Frequency, kinetics and determinants of viable SARS-cov-2 in bioaerosols from ambulatory COVID-19 patients infected with the beta, delta or omicron variants
(Nature Research, 2024)Airborne transmission of SARS-CoV-2 aerosol remains contentious. Importantly, whether cough or breath-generated bioaerosols can harbor viable and replicating virus remains largely unclarified. We performed size-fractionated ... -
From benthic to floating: phytoplankton dynamics in African freshwater lakes and reservoirs
(Elsevier, 2023)This chapter reviewed phytoplankton communities in African freshwater lakes and reservoirs and further assessed the latitudinal diversity gradient (LDG) which has been used to explain species variations in other taxonomic ... -
From conflict to collaboration: Atewa forest governance
(Taylor and Francis Group, 2023)The problem of forest degradation and loss has become theconcern of many countries. To address this challenge, somecollaborate in sustainable forest management. The mostsuccessful outcomes, however, are observed where ... -
From vagueness to precision: raising the volume on social issues for the water sector
(IWA Publishing, 2013)The paper raises the volume on complex social issues that affect water management. The paper proposes Amartya Sen's capability approach (CA) as a suitable framework against which to consider these complex ideals. This ... -
Fuel cell-battery hybrid powered light electric vehicle (golf cart): Influence of fuel cell on the driving performance
(Elsevier, 2013)A light electric vehicle (golf cart, 5 kW nominal motor power) was integrated with a commercial 1.2 kW PEM fuel cell system, and fuelled by compressed hydrogen (two composite cylinders, 6.8 L/300 bar each). Comparative ... -
A full treatment of peculiar velocities on the reionization light cone
(Oxford Academic, 2019)Accurate simulations of the 21-cm signal from the Epoch of Reionization require the generation of maps at specific frequencies given the values of astrophysical and cosmological parameters. The peculiar velocities of the ... -
Full-sky bispectrum in redshift space for 21cm intensity maps
(IOP Publishing, 2020)We compute the tree-level bispectrum of 21cm intensity mapping after reionisation. We work in directly observable angular and redshift space, focusing on equal-redshift correlations and thin redshift bins, for which the ... -
A fumonisins immunosensor based on polyanilino-carbon nanotubes doped with palladium telluride quantum dots
(MDPI, 2015)An impedimetric immunosensor for fumonisins was developed based on poly(2,5-dimethoxyaniline)-multi-wall carbon nanotubes doped with palladium telluride quantum dots onto a glassy carbon surface. The composite was assembled ... -
Functional and structural analysis of predicted proteins obtained from homo sapiens' minisatellite 33.15-tagged transcript pAKT-45 variants
(Hindawi, 2020)The spermatozoa are transcriptionally dormant entities which have been recognized to be an archive of mRNA, coding for a variety of functionally crucial cellular proteins. This significant repository of mRNA is predicted ... -
Functional landscape of SARS-CoV-2 cellular restriction
(Cell Press, 2021)A deficient interferon (IFN) response to severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) infection has been implicated as a determinant of severe coronavirus disease 2019 (COVID-19). To identify the molecular ... -
Functional metal oxides synthesized using natural extracts from waste maize materials
(Elsevier, 2021)We show in this article the possibilities of employing an environmentally friendly, uncomplicated, economical and sustainable green synthesis technique effected by natural extracts from waste maize (zea mays lea) materials to ... -
Functional prediction of candidate micrornas for CRC management using in silico approach
(MDPI, 2019)Approximately 30–50% of malignant growths can be prevented by avoiding risk factors and implementing evidence-based strategies. Colorectal cancer (CRC) accounted for the second most common cancer and the third most common ... -
Fundamental physics with the square kilometre array
(Cambridge University Press, 2020)The Square Kilometre Array (SKA) is a planned large radio interferometer designed to operate over a wide range of frequencies, and with an order of magnitude greater sensitivity and survey speed than any current radio ... -
Fungal‑derived compounds and mycogenic nanoparticles with antimycobacterial activity: a review
(Springer, 2022)Tuberculosis (TB) is a persistent lung infection caused by Mycobacterium tuberculosis. The disease is characterized by high mortality rates of over 1 million per year. Unfortunately, the potency and efectiveness of currently ... -
Further evidence for periodontal disease as a risk indicator for adverse pregnancy outcomes
(Elsevier, 2017)Although there is increasing evidence to suggest an association between periodontal disease and adverse pregnancy outcomes, the issue remains controversial. Study objective: This study tested the hypothesis that ... -
Further observations of Hipparcos red stars and standards for UBV(RI)C photometry
(Oxford University Press, 2007)We present homogeneous and standardized UBV(RI)C JHK photometry for over 100 M stars selected from an earlier paper on the basis of apparent photometric constancy. L photometry has been obtained for stars brighter than ... -
Fusion-assisted hydrothermal synthesis and post-synthesis modification of mesoporous hydroxy sodalite zeolite prepared from waste coal fly ash for biodiesel production
(MDPI, 2022)Increases in biodiesel prices remains a challenge, mainly due to the high cost of conventional oil feedstocks used during biodiesel production and the challenges associated with using homogeneous catalysts in the process. ... -
Gaia Data Release 1. Open cluster astrometry: performance, limitations, and future prospects
(EDP Sciences, 2017)CONTEXT: The first Gaia Data Release contains the Tycho-Gaia Astrometric Solution (TGAS). This is a subset of about 2 million stars for which, besides the position and photometry, the proper motion and parallax are ... -
Gaia21bty: An exor light curve exhibiting a fuor spectrum
(Oxford University Press, 2023)Gaia21bty, a pre-main-sequence star that previously had shown aperiodic dips in its light curve, underwent a considerable ∆G ≈ 2.9 mag brightening that occurred over a few months between 2020 October and 2021 February. The ...