Faculty of Natural Sciences: Recent submissions
Now showing items 2181-2200 of 2662
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Application on gold nanoparticles-dotted 4-nitrophenylazo graphene in a label-free impedimetric deoxynivalenol immunosensor
(MDPI, 2015)In this paper, we report a new concept to construct a label-free electrochemical inhibition-based immunosensor for the detection of the mycotoxin deoxynivalenol (DON) in cereal samples. The electrochemical impedance ... -
Acylphloroglucinol derivatives from the South African helichrysum niveum and their biological activities
(MDPI, 2015)Abstract: Phytochemical investigation of aerial parts of Helichrysum niveum (H. niveum) using different chromatographic methods including semi-preparative HPLC afforded three new (1–3) and six known (4–10) acylphloroglucinols ... -
Inhibition of oxidative stress and skin aging-related enzymes by prenylated chalcones and other flavonoids from helichrysum teretifolium
(MDPI, 2015)Ten flavonoid-related structures viz. heliteretifolin (1), isoxanthohumol (2), 2',4',6'-trihydroxy-3'-prenylchalcone (3), isoglabranin (4), glabranin (5), 7-methoxyisoglabranin (6), quercetin (7), 4'-methoxyquercetin ... -
Marrubiin
(MDPI, 2013)The ethno-medicinal approach to drug discovery represents one of the most important sources of new and safe therapeutic agents to the challenges confronting modern medicine and daily life. Many of the traditionally ... -
Metallo-graphene nanocomposite electrocatalytic platform for the determination of toxic metal ions
(MDPI, 2011)A Nafion-Graphene (Nafion-G) nanocomposite solution in combination with an in situ plated mercury film electrode was used as a highly sensitive electrochemical platform for the determination of Zn2+, Cd2+, Pb2+ and Cu2+ ... -
Potential broad spectrum inhibitors of the coronavirus 3CLpro: a virtual screening and structure-based drug design study
(MDPI, 2015)Human coronaviruses represent a significant disease burden; however, there is currently no antiviral strategy to combat infection. The outbreak of severe acute respiratory syndrome (SARS) in 2003 and Middle East respiratory ... -
Identification of new respiratory viruses in the new millennium
(MDPI, 2015)The rapid advancement of molecular tools in the past 15 years has allowed for the retrospective discovery of several new respiratory viruses as well as the characterization of novel emergent strains. The inability to ... -
Electrochemical Aptatoxisensor Responses on Nanocomposites containing electro-deposited silver nanoparticles on poly(propyleneimine) dendrimer for the detection of microcystin-lr in freshwater
(MDPI, 2016)A sensitive and reagentless electrochemical aptatoxisensor was developed on cobalt (II) salicylaldiimine metallodendrimer (SDD-Co(II)) doped with electro-synthesized silver nanoparticles (AgNPs) for microcystin-LR (L, ... -
Service-aware clustering: an energy-efficient model for the internet-of-things
(MDPI, 2016)Current generation wireless sensor routing algorithms and protocols have been designed based on a myopic routing approach, where the motes are assumed to have the same sensing and communication capabilities. Myopic routing ... -
On the design of smart parking networks in the smart cities: an optimal sensor placement model
(MDPI, 2015)Smart parking is a typical IoT application that can benefit from advances in sensor, actuator and RFID technologies to provide many services to its users and parking owners of a smart city. This paper considers a smart ... -
Metaviromics of namib desert salt pans: a novel lineage of haloarchaeal salterproviruses and a rich source of ssDNA viruses
(MDPI, 2016)Viral communities of two different salt pans located in the Namib Desert, Hosabes and Eisfeld, were investigated using a combination of multiple displacement amplification of metaviromic DNA and deep sequencing, and provided ... -
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 ... -
A calibration report for wireless sensor-based weatherboards
(MDPI, 2015)Sub-Saharan Africa contains the highest number of people affected by droughts. Although this can easily be mitigated through the provision of timely, reliable and relevant weather forecasts, the sparse network of weather ... -
An unusual 2,3-secotaraxerene and other cytotoxic triterpenoids from pleiocarpa pycnantha (apocynaceae) leaves collected from Nigeria
(MDPI, 2014)Three known triterpenoids, namely ursolic acid (1), and the 27-E- and 27-Z-pcoumaric esters of ursolic acid (compounds 2, 3), were isolated together with a new triterpene 2,3-seco-taraxer-14-en-2,3-lactone [pycanocarpine ... -
Carbapenem resistance expressed by Gram-negative bacilli isolated from a cohort of Libyan patients
(BioMed Central, 2016)Background and objectives: Carbapenem-resistant Enterobacteriaceae (CRE) and other Gram-negative bacteria are among the most common pathogens responsible for both community and hospital acquired infection. The global spread ... -
Life-long programming implications of exposure to tobacco smoking and nicotine before and soon after birth: Evidence for altered lung development
(MDPI, 2011)Tobacco smoking during pregnancy remains common, especially in indigenous communities, and likely contributes to respiratory illness in exposed offspring. It is now well established that components of tobacco smoke, notably ... -
Correction: Baker, P. et al. electrochemical aptasensor for endocrine disrupting 17β-estradiol based on a poly(3,4-ethylenedioxylthiopene)-gold nanocomposite platform. Sensors 2010, 10, 9872-9890
(MDPI, 2011)Herewith please find corrected structures for Figure 8 in our paper published in Sensors in 2010. -
Electrochemical aptasensor for endocrine disrupting 17β-estradiol based on a poly(3,4-ethylenedioxylthiopene)-gold nanocomposite platform
(MDPI, 2010)A simple and highly sensitive electrochemical DNA aptasensor with high affinity for endocrine disrupting 17β-estradiol, was developed. Poly(3,4-ethylenedioxylthiophene) (PEDOT) doped with gold nanoparticles (AuNPs) was ... -
Determination of anthracene on Ag-Au alloy nanoparticles/overoxidized-polypyrrole composite modified glassy carbon electrodes
(MDPI, 2010)A novel electrochemical sensor for the detection of anthracene was prepared by modifying a glassy carbon electrode (GCE) with over-oxidized polypyrrole (PPyox) and Ag-Au (1:3) bimetallic nanoparticles (Ag-AuNPs). The ... -
Polyester sulphonic acid interstitial nanocomposite platform for peroxide biosensor
(MDPI, 2009)A novel enzyme immobilization platform was prepared on a platinum disk working electrode by polymerizing aniline inside the interstitial pores of polyester sulphonic acid sodium salt (PESA). Scanning electron microscopy ...