Browsing Faculty of Natural Sciences by Title

Now showing items 1319-1338 of 2571

    • Isolation and characterization of strain exiguobacterium sp. Krl4, a producer of bioactive secondary metabolites from a Tibetan glacier 

      Tedesco, Pietro; Esposito, Fortunato Palma; van Zyl, Leonardo Joaquim (MPDI, 2021)
      Extremophilic microorganisms represent a unique source of novel natural products. Among them, cold adapted bacteria and particularly alpine microorganisms are still underexplored. Here, we describe the isolation and ...

    • Isoscalar giant monopole strength in 58Ni, 90Zr, 120Sn and 208Pb 

      Bahini, Armand; Neveling, Retief; Rebeiro, Bernadette (American Physical Society, 2023)
      Inelastic α-particle scattering at energies of a few hundred MeV and very-forward scattering angles including 0° has been established as a tool for the study of the isoscalar giant monopole (IS0) strength distributions ...

    • Isothermal dust models of Herschel-ATLAS galaxies 

      Smith, Daniel J.B.; Hardcastle, M.J.; Jarvis, Matt (Oxford University Press, 2013)
      We use galaxies from the Herschel-ATLAS survey, and a suite of ancillary simulations based on an isothermal dust model, to study our ability to determine the effective dust temperature, luminosity and emissivity index of ...

    • Iterative mapping of marine ecosystems for spatial status assessment, prioritization, and decision support 

      Sink, Kerry J.; Adams, Luther A.; Makwela, Mapula (Frontiers Media, 2023)
      South Africa has taken an iterative approach to marine ecosystem mapping over 18 years that has provided a valuable foundation for ecosystem assessment, planning and decision-making, supporting improved ecosystem-based ...

    • Iterative prophylactic treatment by hematin in two cases of recurrent disabling acute intern1ittent porphyria (AIP) 

      Mugabo, Pierre; Coche, Lefebvre E.; Hassoun, A. (Elsevier, 1989)
      Summary: Hematin is known as a useful drug in the treatment of acute intermittent porphyria (Al P) attacks. We have used it with success as an iterative prophylactic treatment in two cases of AIP with recurrent disabling ...

    • J1615+5452: a remnant radio galaxy in the ELAIS-N1 field 

      Taylor, A. R.; Randriamanakoto, Z.; Ishwara-Chandra, C. H. (Oxford University Press, 2020)
      We report the discovery of a remnant radio active galactic nucleus (AGN) J1615+5452 in the field of ELAIS-N1. GMRT continuum observations at 150, 325, and 610 MHz combined with archival data from the 1.4 GHz NVSS survey ...

    • Jellyfication of marine ecosystems as a likely consequence of overfishing small pelagic fishes: Lessons from the Benguela 

      Roux, Jean-Paul; van der Lingen, Carl D.; Gibbons, Mark J.; Moroff, Nadine E.; Shannon, Lynne J.; Smith, Anthony D.M.; Cury, Philippe M. (University of Miami, Rosenstiel School of Marine and Atmospheric Science, 2013)
      Changes in two contrasting ecosystems of the Benguela upwelling region, one dominated at mid-trophic level by jellyfishes (Namibia, northern Benguela ecosystem, where small pelagic fish abundance has been severely depleted) ...

    • Jet feedback and the photon underproduction crisis in SIMBA 

      Dave, Romeel; Christiansen, Jacob; Sorini, Daniele; Angles-Alc ´ azar, Daniel (Oxford University Press, 2020-10-01)
      We examine the impact of black hole jet feedback on the properties of the low-redshift intergalactic medium (IGM) in the SIMBA simulation, with a focus on the Lyα forest mean flux decrement DA. Without jet feedback, we ...

    • JHKs time-series observations of a few ultracool dwarfs 

      Koen, Chris; Tanabe, T.; Tamura, M.; Kusakabe, N. (Oxford University Press, 2005)
      The M8.5 object SSSPM J0109−5101 has recently been shown to be both a periodic and a flaring variable, based on optical observations in the extreme red. More than 16 h of monitoring in the near-infrared (NIR) reported ...

    • JL 82: a slowly pulsating hot subdwarf star in a close binary system 

      Koen, Chris (Oxford University Press, 2009)
      JL 82 is a known binary, consisting of an sdB star and a companion which is not directly observable in the optical. Photometric measurements reported in this paper show it to variable with both the binary period (∼0.75 ...

    • K-CLASH: spatially resolving star-forming galaxies in field and cluster environments at z ≈ 0.2–0.6 

      Jarvis, Matt; Tiley, Alfred L.; Vaughan, Sam P. (Oxford University Press, 2020)
      We present the KMOS-CLASH (K-CLASH) survey, a K-band Multi-Object Spectrograph (KMOS) survey, of the spatially resolved gas properties and kinematics of 191 (pre-dominantly blue) H α-detected galaxies at 0.2 ≲ z ≲ 0.6 in ...

    • K-CLASH: Strangulation and ram pressure stripping in galaxy cluster members at 0.3 < z < 0.6 

      Jarvis, Matt; Vaughan, Sam; Tiley, Alfred (Oxford University Press, 2020-06-26)
      Galaxy clusters have long been theorized to quench the star formation of their members. This study uses integral-field unit observations from the K-band MultiObject Spectrograph (KMOS) – Cluster Lensing And Supernova ...

    • K21 compound, a potent antifungal agent: Implications for the treatment of fluconazole-resistant HIV-associated Candida species 

      John, Cathy Nisha; Abrantes, Pedro Miguel dos Santos; Prusty, Bhupesh; Ablashi, Dharam; Africa, Charlene Wilma Joyce (Frontiers, 2019-05-24)
      Background/objectives: With mucocutaneous candidiasis being highly prevalent in HIV patients, the emergence of fluconazole-resistant Candida species forms a major challenge in treating and eradicating these infections. The ...

    • The Karl G. Jansky Very Large Array Sky Survey (VLASS). Science Case and Survey Design 

      M. Lacy; S. A. Baum; C. J. Chandler; S. Chatterjee; T. E. Clarke; S. Deustua; J. English; J. Farnes; R. L. White; (The Astronomical Society of the Pacific, 2020)
      The Very Large Array Sky Survey (VLASS) is a synoptic, all-sky radio sky survey with a unique combination of high angular resolution (≈2 5), sensitivity (a 1σ goal of 70 μJy/beam in the coadded data), full linear ...

    • Keep the flow: Citizen science as agonistic learning 

      Goldin, Jacqueline; Suransky, Carolina; Kanyerere, Thokozani (Ubiquity Press, 2023)
      This paper addresses the transformative and emancipatory potential of citizen science not only concerning its role in groundwater management, but also regarding its contribution to enhanced and sustainable well-being. ...

    • Kelp forests: forests of a different kind 

      Maneveldt, Gavin (Botanical Society of South Africa, 2011)
      The United Nations (UN) Food and Agriculture Organization (FAO) defines a forest as being 'more than 0.5 ha with trees higher than 5 m and a canopy cover of more than 10%, or trees able to reach these thresholds in situ', ...

    • KernTune: Self-tuning Linux kernel performance using support vector machines 

      Yi, Long; Connan, James (Association for Computing Machinery, 2007)
      Self-tuning has been an elusive goal for operating systems and is becoming a pressing issue for modern operating systems. Well-trained system administrators are able to tune an operating system to achieve better system ...

    • Kiara: an open source SIP system to support Deaf telephony 

      Yi, Long; Tucker, William David (Telkom, 2008)
      This paper describes Kiara, an open source SIPbased communication system that provides the building blocks to enable Deaf relay services. We have implemented a prototype that provides real-time text, voice and video to a ...

    • The kinematic dipole in galaxy redshift surveys 

      Maartens, Roy; Clarkson, Chris; Chen, Song (IOP Publishing, 2018)
      In the concordance model of the Universe, the matter distribution { as observed in galaxy number counts or the intensity of line emission (such as the 21cm line of neutral hydrogen) - should have a kinematic dipole due ...

    • KPD 0629–0016, a slowly pulsating hot subdwarf star 

      Koen, Chris; Green, E.M. (Oxford University Press, 2007)
      The results of nine CCD photometric observing runs on KPD 0629–0016 are presented. During six of the runs measurements were obtained alternately through B and V filters. Four periodicities, for which there is good agreement ...