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Search Results: 1 - 10 of 402447 matches for " Kaas J.H. "
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The brain decade in debate: VI. Sensory and motor maps: dynamics and plasticity
Das A.,Franca J.G.,Gattass R.,Kaas J.H.
Brazilian Journal of Medical and Biological Research , 2001,
Abstract: This article is an edited transcription of a virtual symposium promoted by the Brazilian Society of Neuroscience and Behavior (SBNeC). Although the dynamics of sensory and motor representations have been one of the most studied features of the central nervous system, the actual mechanisms of brain plasticity that underlie the dynamic nature of sensory and motor maps are not entirely unraveled. Our discussion began with the notion that the processing of sensory information depends on many different cortical areas. Some of them are arranged topographically and others have non-topographic (analytical) properties. Besides a sensory component, every cortical area has an efferent output that can be mapped and can influence motor behavior. Although new behaviors might be related to modifications of the sensory or motor representations in a given cortical area, they can also be the result of the acquired ability to make new associations between specific sensory cues and certain movements, a type of learning known as conditioning motor learning. Many types of learning are directly related to the emotional or cognitive context in which a new behavior is acquired. This has been demonstrated by paradigms in which the receptive field properties of cortical neurons are modified when an animal is engaged in a given discrimination task or when a triggering feature is paired with an aversive stimulus. The role of the cholinergic input from the nucleus basalis to the neocortex was also highlighted as one important component of the circuits responsible for the context-dependent changes that can be induced in cortical maps.
The gastrointestinal tract and HIV pathogenesis
J.H Downs
South African Journal of Clinical Nutrition , 2010,
Abstract: Gastrointestinal dysfunction has been recognised as a major manifestation of the human immunodeficiency virus (HIV) infection usually presenting as diarrhoea which may or may not be due to the presence of an opportunistic infection of the GIT. Contrary to earlier assumptions, there is now substantial evidence to demonstrate that there are significant changes in the gut in the acute phase of HIV infection; the most significant of these being the substantial loss of the CD4+ T-cells in the GIT. Delays in the initiation of HAART (that is, once the CD4+ T-cell count drops below 200 cells/uL), is associated with a greater severity of HIV-associated GIT enteropathy, and poor clinical outcome.
Challenges facing the ATKV to succeed within the context of a global information community
J.H. Basson
South African Journal of Information Management , 2009, DOI: 10.4102/sajim.v4i3.180
Abstract:
Feeding habits of the Cape Mountain Zebra Equus zebra zebra LINN. 1758
J.H Grobler
Koedoe : African Protected Area Conservation and Science , 1983, DOI: 10.4102/koedoe.v26i1.596
Abstract: The feeding habits of the Cape mountain zebra Equus zebra zebra Linn. 1758, were studied in the Mountain Zebra National Park. They were highly selective utilising only seven of 17 available grass species at feeding sites and 26 of plants available. These zebra fed at 40 mm to 80 mm above the ground except when eating seed heads of certain grass species. Protein levels of grasses eaten were above 4 and seasonal movements were associated with mean food quality @ there were thus summer grazing and winter grazing areas. Mean crude protein in the faeces fluctuated seasonally.
An annotated check list of the leeches (Annelida : Hirudinea) of the Kruger National Park with a key to the species
J.H. Oosthuizen
Koedoe : African Protected Area Conservation and Science , 1991, DOI: 10.4102/koedoe.v34i2.421
Abstract: The diagnosis, distribution and bionomics of the ten species of leeches occurring in the Kruger National Park and a key to the identification of the species are presented. Seven species belong to the family Glossiphoniidae, two to the family Hirudinidae and one species to the family Salifidae. The African fish leech Batracobdelloides tricarinatus and the reptilian parasite Placobdelloidesmultistriatus are the most common species in the park. Two of the three snail leeches occurring in the reserve, viz. Alboglossiphoniadisjuncta and Helobdella conifera, the predaceous Salifa perspicax and the sanguivorous Hirudo michaelseni are widespread but not common. The snail leech Alboglossiphonia conjugata occurs only in the small Madzaringwi River and its tributaries located in the most northern part of the park. The amphibian parasite Oosthuizobdella stuhlmanni was found only at two adjacent localities in the most southern reaches of the park with the sanguivorous Asiatic obdella buntonensis limited to the southern half of the reserve. The host-specific parasite of hippopotami, Placobdelloidesjaegerskioeldi, is restricted to habitats inhabited by its host.
Surinaamse aquarellen en tekeningen van A. Borret. (Met 4 platen)
J.H. Maronier
Bijdragen tot de Taal-, Land- en Volkenkunde , 1955,
Abstract:
Tekeningen en aquarellen van J.H.W. Le Clercq (met platen)
J.H. Maronier
Bijdragen tot de Taal-, Land- en Volkenkunde , 1953,
Abstract:
Grieks aan die P.U. vir C.H.O.*
J.H. Grobler
Koers : Bulletin for Christian Scholarship , 1967, DOI: 10.4102/koers.v35i1.1373
Abstract: Met hierdie rede word betoog dat die patroon van die studie van Grieks wat deur die Atheners vier tot vyf eeue v.C. daargestel is en deur die Alexandryne en Pergamon van drie eeue v.C. tot drie eeu n.C. verder gevorm is, deur die eeue nagevolg is, telkens met die oogmerke wat gepas het by die bepaalde tye, tot in die twintigste eeu. Volgens hierdie patroon is Attiese Grieks bestudeer. Die Attiese Grieks is die literêre taal, die skryftaal, van Athene in die vyfde en vierde eeue v.C. Hierdie tradisie is ook aan die P.U. vir C.H.O. nagevolg. Aan hierdie Universiteit is die studente van Grieks hoofsaaklik, indien nie uitsluitlik nie, voornemende teologiese studente.
Die onlangse bewindverandering in Afrika
J.H. Coetzee
Koers : Bulletin for Christian Scholarship , 1966, DOI: 10.4102/koers.v34i1-3.1409
Abstract: Na die Tweede Wêreldoorlog het Afrika die aandag op horn getrek veral ten gevolge van die snelle ontvoogdingsproses ten opsigte van sy vroeere onderhorige gebiede en wel op ’n skaal en teen 'n tempo wat die benaming politieke rewolusie geregverdig het. Daar was baie wat hiervan nie veel goeds verwag het nie, maar hulle waarskuwings is versmoor onder die geklank van optimistiese jubelsange van hoe verwagtings oor die vrye state en nasies van onafhanklike Afrika. Die humanitere en liberale demokrasie is geloof as die verlossende mag en die ligbringende krag in die vroeere donker kontinent.
Die problematiek van volkswording in Afrika
J.H. Coetzee
Koers : Bulletin for Christian Scholarship , 1967, DOI: 10.4102/koers.v35i3.1380
Abstract: Die groeiende proses van ontvoogding van Afrika het plaasgevind met die klem op bepaalde gebiede: Ghana, Nigeri , Kenia e.d.m. Die mense van die gebiede het op die agtergrond van die kenniswêreld en van die bewussyn gebly. Hiervoor moet waarskynlik twee veroorsakende faktore verantwoordelik gehou word. Die een is ’n erfenis uit die koloniale tydperk. Dit was kenmerkend van die stormloop na Afrika dat die belanghebbende koloniseerders kleims” afgepen het. Hulle het letterlik beslag gelê op territoriaal-administratiewe eenhede en het dienooreenkomstig grense bepaal waarby die organiese, histories-geworde etniese eenhede weinig of geensins in ag geneem is nie.
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