Now showing items 387-406 of 919

  • High temperature (HT) polymer electrolyte membrande fuel cells (PEMFC) - A review 

    Chandan A, Hattenberger M,Pollet BG and 6 other; Chandan, Amrit; Hattenberger, Mariska; El-kharouf, Ahmad; Du, Shangfeng; Dhir, Aman; Self, Valerie; Pollet, Bruno G.; Ingram, Andrew; Bujalski, Waldemar (Elsevier, 2013)
    One possible solution of combating issues posed by climate change is the use of the High Temperature (HT) Polymer Electrolyte Membrane (PEM) Fuel Cell (FC) in some applications. The typical HT-PEMFC operating temperatures ...
  • The high-ion content and kinematics of low-redshift lyman limit systems 

    Fox, Andrew J.; Lehner, Nicholas; Dave, Romeel; Tumlinson, Jason; Howk, J. Christopher; Tripp, Todd M.; Prochaska, J. Xavier; O'Meara, John M.; Werk, Jessica K.; Bordoloi, Rongmon; Katz, Neal; Oppenheimer, Benjamin D. (The American Astronomical Society, 2013)
    We study the high-ion content and kinematics of the circumgalactic medium around low-redshift galaxies using a sample of 23 Lyman limit systems (LLSs) at 0.08 < z < 0.93 observed with the Cosmic Origins Spectrograph on ...
  • High-level diversity of tailed phages, eukaryote-associated viruses, and virophage-like elements in the metaviromes of Antarctic soils 

    Zablocki, Olivier; van Zyl, Lonnie; Adriaenssens, Evelien M.; Rubagotti, Enrico; Tuffin, Marla; Cary, Stephen Craig; Cowan, Donald A. (American Society for Microbiology, 2014)
    The metaviromes of two distinct Antarctic hyperarid desert soil communities have been characterized. Hypolithic communities, cyanobacterium-dominated assemblages situated on the ventral surfaces of quartz pebbles embedded ...
  • High-Precision Branching Ratio Measurement for the Superallowed + Emitter 74Rb 

    Dunlop, R.; Ball, G.C.; Leslie, J.R.; Svensson, C.E.; Towner, I.S.; Andreoiu, C.; Chagnon-Lessard, S.; Chester, A.; Cross, D.S.; Finlay, P.; Garnsworthy, A.B.; Garrett, P.E.; Glister, J.; Hackman, G.; Hadinia, B.; Leach, K. G.; Rand, E.T.; Starosta, K.; Tardiff, E.R.; Triambak, S.; Williams, S. J.; Wong, J.; Yates, S.W.; Zganjar, E.F. (American Physical Society, 2013)
    A high-precision branching-ratio measurement for the superallowed β + decay of 74Rb was performed at the TRIUMF Isotope Separator and Accelerator (ISAC) radioactive ion-beam facility. The scintillating electronpositron tagging ...
  • Hitting the right target: taxonomic challenges for, and of, plant invasions 

    Pysek, Petr; Hulme, Philip E.; Meyerson, Laura A.; Smith, Gideon F.; Boatwright, James S.; Crouch, Neil R.; Figueiredo, Estrela; Foxcroft, Llewellyn C.; Jarosık, Vojtech; Richardson, David M.; Suda, Jan; Wilson, John R.U. (Oxford University Press, 2013)
    This paper explores how a lack of taxonomic expertise, and by implication a dearth of taxonomic products such as identification tools, has hindered progress in understanding andmanaging biological invasions. It also ...
  • HIV/Candida co-infection in Sub-Saharan African women on ART 

    Abrantes, Pedro Miguel dos Santos; Africa, Charlene W.J. (Infectious Diseases Society of Southern Africa, the Sexually Transmitted Diseases Society of Southern and the Public Health Association of South Africa., 2013)
    INTRODUCTION: Sub-Saharan Africa has 23.5 million cases of HIV and is home to 92% of the world’s HIV-positive pregnant women of whom 24% die of pregnancy related complications. Oral candidiasis is a common condition in ...
  • The host haloes of O I absorbers in the reionization epoch 

    Finlator, Kristian; Muñoz, Joseph A.; Dave, Romeel; Oppenheimer, B. D.; Peng Oh, S.; Özel, Feryal (Oxford University Press, 2013)
    We use a radiation hydrodynamic simulation of the hydrogen reionization epoch to study OI absorbers at z ∼ 6. The intergalactic medium (IGM) is reionized before it is enriched; hence, OI absorption originates within dark ...
  • Hot subdwarf stars in close-up view IV. Helium abundances and the 3He isotopic anomaly of subdwarf B stars 

    Geier, S.; Edelmann, H.; Kilkenny, David; O'Donoghue, D.; Marsh, T.R.; Copperwheat, C. (EDP Sciences, 2013)
    Atmospheric parameters and helium abundances of 44 bright subdwarf B stars have been determined. More than half of our sample consists of newly discovered stars from the Edinburgh Cape survey. We showed that effective ...
  • Housing ownership among female migrants in South Africa: The case of metropolitan and non-metropolitan areas 

    Nsengiyumva, Philomene; Tati, Gabriel (SUN Journals, 2017)
    In the study of female migration and housing acquisition, little has been elaborated about the magnitude and the direction of female migrants in South African context. Furthermore, housing tenure status is still under ...
  • How to write a popular article 

    Maneveldt, Gavin; Moore, R.; Day, J.; Reid, J. (SANCOR, 2008)
    This newsletter has criteria for the development of a popular article.
  • HPLC determination of selected flavonoid glycosides and their corresponding aglycones in Sutherlandia frutescens materials 

    Mbamalu, Oluchi; Antunes, E.; Silosini, N.; Samsodien, Halima; Syce, James (OMICS, 2016)
    Sutherlandia frutescens is a popular South African plant commercially available in a range of formulations. However, reference standards for quality and stability assessment are lacking. This work reports the development and ...
  • Human African trypanosomiasis research gets booost: unravelling the tsetse Genome 

    Aksoy, Serap; Attardo, Geoffrey; Berriman, Matthew; Christoffels, Alan; Lehane, Mike; Masiga, Daniel K.; Toure', Yeya (PLOS, 2014)
    Human African trypanosomiasis (HAT), also known as sleeping sickness, is a neglected disease that impacts 70 million people distributed over 1.55 million km2 in sub-Saharan Africa. Trypanosoma brucei gambiense accounts for ...
  • Human coronavirus NL63 open reading frame 3 encodes a virion-incorporated N-glycosylated membrane protein 

    Müller, Marcel A.; van der Hoek, Lia; Voss, Daniel; Bader, Oliver; Lehmann, Dörte; Schulz, Axel R.; Kallies, Stephan; Suliman, Tasnim; Fielding, Burtram C.; Drosten, Christian; Niedrig, Matthias (BioMed Central, 2010)
    Background: Human pathogenic coronavirus NL63 (hCoV-NL63) is a group 1 (alpha) coronavirus commonly associated with respiratory tract infections. In addition to known non-structural and structural proteins all coronaviruses ...
  • Human sperm handling in intracytoplasmic sperm injection processes: In vitro studies on mouse oocyte activation, embryo development competence and sperm oxidation–reduction potential 

    Roychoudhury, S.; Maldonado-Rosas, I.; Agarwal, A.; Esteves, S.C.; Henkel, Ralf; Sharma, Rajan (Wiley, 2018)
    Polyvinylpyrrolidone (PVP) and hyaluronic acid (HA) are routinely used in handling spermatozoa for intracytoplasmic sperm injection (ICSI). As there are still concerns about possible adverse effects on the embryo, this ...
  • Hunting down horizon-scale effects with multi-wavelength surveys 

    Fonseca, Jose; Camera, Stefano; Santos, Mario G.; Maartens, Roy (American Astronomical Society, 2015)
    Next-generation cosmological surveys will probe ever larger volumes of the universe, including the largest scales, near and beyond the horizon. On these scales, the galaxy power spectrum carries signatures of local primordial ...
  • Hydrogen absorption study of high-energy reactive ball milled Mg composites with palladium additives 

    Williams, M.; Sibanyoni, J.M.; Lototskyy, Mykhaylo; Pollet, Bruno G. (Elsevier, 2013)
    Hydrogenation behaviour, structure, morphology and dehydrogenation/re-hydrogenation performances of Mg–Pd nanocomposites prepared by high-energy reactive ball milling in H2 (HRBM) of Mg in the presence of amorphous and ...
  • A hydrogeomorphological approach to quantification of groundwater discharge to streams in South Africa 

    Xu, Yongxin; Holness, S.D.; Zhang, J.; van Tonder, Gerrit J. (Water Research Commission, 2002)
    In South Africa, the flow requirements for maintaining the normal functioning of aquatic ecosystems is termed the “ecological reserve”, and these should be determined when a licence application for water allocation is ...
  • Hydromedusae off the Orange River Mouth, Southern Africa 

    Sparks, Conrad A.J.; Gibbons, Mark J. (NISC (Pty) Ltd and Taylor& Francis, 2003)
    A total of 242 zooplankton samples from the upper 100 m of the water column was collected discontinuously from March 1997 to January 1999 off the Orange River mouth on the west coast of southern Africa. Six species of ...
  • Hyphenated LC-ICP-MS/ESI-MS identification of halogenated metabolites in South African marine ascidian extracts 

    Bromley, Candice L.; Raab, Andrea; Parker-Nance, Shirley; Beukes, Denzil R.; Jaspars, Marcel; Davies-Coleman, Michael T. (The South African Chemical Institute, 2018)
    Extracts of 13 species of marine ascidian collected in Algoa Bay were analyzed by LC-ICP-MS/ESI-MS. This technique allows parallel analysis of the molecular species and the presence of certain elements. The LC-ICP-MS/ESI-MS ...
  • Hypolithic and soil microbial community assembly along an aridity gradient in the Namib Desert 

    Stomeo, Francesca; Valverde, Angel; Pointing, Stephen B.; McKay, Christopher P.; Warren-Rhodes, Kimberley A.; Tuffin, Marla I.; Seely, Mary; Cowan, Donald A. (Springer, 2013)
    The Namib Dessert is considered the oldest desert in the world and hyperarid for the last 5 million years. However, the environmental buffering provided by quartz and other translucent rocks supports extensive hypolithic ...