Browsing Faculty of Natural Sciences by Title

Now showing items 122-141 of 294

IC and RC band time-series observations of some bright ultracool dwarfs

Koen, Chris (Oxford University Press, 2005)

The results of more than 100 h of CCD photometric monitoring of 10 L dwarfs and two T dwarfs are presented. Reasonable evidence is shown for IC band variability in DENIS 0255−4700, DENIS 1705−0516 and 2M 2104−1037. ...
ICT and information security perspectives in E-Health Systems

Agbele, Kehinde K.; Nyongesa, Henry O.; Adesina, Ademola Olusola (Medwell Journals, 2010)

This study examines issues pertinent to the rapidly evolving use of information as a currency of modern economies. Access to information has important benefits that can be achieved in many areas including, social-economic ...
Identification and characterization of the Trichoplusia ni Single Capsid Nuclear Polyhedrosis Virus p10 gene

Fielding, Burtram C.; Davison, Sean (Springer Verlag, 2000)

The p10 gene was identified and characterized from the Trichoplusia ni single capsid nuclear polyhedrosis virus (TniSNPV). The p10 open reading frame (ORF) sequence was identified following sequencing of the ends of the ...
Identification and profiling of salinity stress-responsive proteins in Sorghum bicolor seedlings

Ngara, Rudo; Ndimba, Roya; Borch-Jensen, Jonas; Jensen, Ole Nørregaard; Ndimba, Bongani (Elsevier, 2012)

Sorghum bicolor, a drought tolerant cereal crop, is not only an important food source in the semi arid/arid regions but also a potential model for studying and gaining a better understanding of the molecular mechanisms ...
Identification, sequence analysis, and phylogeny of the immediate early gene 1 of the trichoplusia ni single nucleocapsid polyhedrosis virus

Wang, Weizhou; Leat, Neil; Fielding, Burtram C.; Davison, Sean (Springer Verlag, 2001)

Substantial research has been conducted on the immediate early 1 (ie-1) genes from the prototype baculovirus Autographa californica multicapsid nuclear polyhedrosis virus (AcMNPV) and the Orgyia pseudotsugata multicapsid ...
Imino-quinolyl palladium(II) and platinum(II) complexes: synthesis, characterization, molecular structures and cytotoxic effect

Motswainyana, William M.; Onani, Martin O.; Madiehe, Abram M.; Saibu, Morounke; Jacobs, Jeroen; van Meervelt, Luc (Elsevier, 2013)

Imino-quinolyl ligands L1-L5 were synthesized by condensation reactions and obtained in good yields. Reactions of the ligands with either PdCl2(cod) or K2[PtCl4] gave the corresponding palladium(II) and platinum(II) complexes ...
Improved SAAO–2MASS photometry transformations

Koen, Chris; Marang, F.; Kilkenny, David; Jacobs, C. (Oxford University Press, 2007)

Near-infrared photometry of 599 stars is used to calculate transformations from the South African Astronomical Observatory (SAAO) JHK system to the Two-Micron All-Sky Survey (2MASS) JHKS system. Both several-term formal ...
In-situ ultrasonic monitoring of zeolite A crystallization from coal fly ash

Musyoka, Nicholas; Petrik, Leslie; Hums, Eric; Baser, Hasan; Schwieger, Wilhelm (Elsevier, 2012)

In this study, high phase purity of zeolite A was prepared from coal fly ash precursors. The molar regime of both the clear solution extract and unseparated fly ash slurry was adjusted to achieve the right composition for ...
Instant Messaging on handhelds: affective feedback

Adesemowo, A. Kayode; Tucker, William D. (Telkom, 2004)

A text only Instant Messaging (IM) built on the IETF open standard SIP/SIMPLE has been developed in line with our proposed introduction of a user-defined text Hotkey feature. These act as an on-click Affective Gesture (AG): ...
Instant messaging on handhelds: an affective gesture approach

Adesemowo, A. Kayode; Tucker, William D. (SAICSIT in association with ACM, 2005)

Text communication can be perceived as lacking in chat spontaneity, or plastic, due to medium limitations during interaction. A form of text messaging, Instant Messaging (IM), is now on the uptake, even on mobile handhelds. ...
The Institute for Microbial Biotechnology and Metagenomics 2009

Cowan, Donald A. (UWC, 2010-01)

The IMBM Brochure (2009) provides a summary of the staffing, activities and outputs of the Institute for the 2009 academic year
An Internet paradigm approach to policy-based network management of legacy kit for VoIP services in Next Generation Networks

Naidoo, Vaughn; Tucker, William D. (Telkom, 2000)

With QoS available on IP-dominant NGNs, Policy-based Network Management (PBNM) is an effective mechanism for managing services as opposed to actual devices. IP is ubiquitous, and any NGN must contend with legacy devices ...
Internet protocol-based push to talk

Kobo, Hlabishi Isaac; Tucker, William D.; Norman, Michael (Telkom, 2010)

This paper discusses a way of offering voice instant messaging based on Internet Protocol using Session Initiation Protocol. The purpose of this investigation is to enhance the modern social communication amongst the people ...
An interoperable signaling solution between SIP and H.323

Jeffries, Michael; Tucker, William D. (Telkom, 2001)

The Session Initiation Protocol and H.323 dominate the Voice over IP world. These signaling protocols are responsible for call setup and call tear down by IP telephony solutions. This project analyses and discusses the ...
An Interoperable signaling solution for IP-based Next Generation Networks

Jeffries, Michael; Tucker, William D. (Telkom, 2000)

Current VoIP signaling protocols are interoperable with the PSTN SS7 via H.323-to-SS7 or SIP-to-SS7 gateways. As we move toward the Next Generation Network, the PSTN falls away and we work toward carrier-grade VoIP ...
An in-vitro analysis of the antimicrobial efficacy of herbal toothpastes on selected primary plaque colonizers

Peck, Mogammad T.; Africa, Charlene W.J.; Stephens, Lawrence X.G.; Marnewick, Johan; Majeed, Abdul (iMD Publishers, 2011)

Plaque associated oral disease affects a considerable portion of the population and is considered one of the major causes of tooth loss. In most cases toothbrushing only removes a limited amount of dental plaque and other ...
An IP based multimodal semi-synchronous rural telehealth service: Adding video messaging and conferencing to MuTI

Vuza, Xolisa; Tucker, William D. (Telkom, 2004)

We intend adding video messaging and conferencing to Multimodal Telemedicine Intecommunicator (MuTI), a previous system that has already been in place in the target environment. This is to allow a semi-synchronous communication ...
Is human Immunodeficiency Virus (HIV) stage an independent risk factor for altering the periodontal status of HIV-positive patients? A South African study

John, Cathy N.; Stephen, Lawrence X.S.; Africa, Charlene W.J. (BioMed Central, 2013)

Background: The immunosuppresion in HIV patients makes them highly susceptible to microbial infections. The aim of the study was to establish whether HIV stage (as depicted by CD4+ T lymphocyte counts) could independently ...
Is millennium development goal 4 achievable in Tanzania?

Appunni, Sathiya Susuman; Hamisi, Hamisi F. (WB Saunders, 2013)

Introduction: This paper will focus on MDG4, which is concerned with reducing child mortality. Childhood mortality rates are the leading indicator of the level of child health and overall development of a country; and ...
Is there evolution in the infrared Tully–Fisher relation? Comparing two linear regressions

Koen, Chris; Lombard, Fred (Oxford University Press, 2009)

In a recent paper, Puech and co-workers compared K-band Tully–Fisher relations derived for nearby and distant galaxies, respectively. They concluded that the two relations differ, and deduced that there is evolution in ...

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