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Search Results: 1 - 10 of 36384 matches for " Dirk Van Papendorp "
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Changes in red blood cell membrane structure in type 2 diabetes: a scanning electron and atomic force microscopy study
Antoinette V Buys, Mia-Jean Van Rooy, Prashilla Soma, Dirk Van Papendorp, Boguslaw Lipinski, Etheresia Pretorius
Cardiovascular Diabetology , 2013, DOI: 10.1186/1475-2840-12-25
Migraine-associated vertigo and dizziness as presenting complaint in a private general medical practice
T Jay-du Preez, D Van Papendorp
South African Family Practice , 2011,
Abstract: Background: Migraine-associated vertigo (MV) remains a developing entity because accepted diagnostic criteria are unavailable. Patients present with debilitating dizziness without experiencing headache, and are often misdiagnosed as anxious. The condition is manageable in primary care without the need for neurological referral. The aim of this study was to investigate the prevalence of MV and migraine-associated dizziness (MD) as presenting complaints. Methods: Patients presented with dizziness probably or definitely associated with migraine history based on the criteria of the International Headache Society. Patients with other vestibulopathies and medical conditions were excluded. Patients were evaluated over a period of nine months. Seven hundred and seventeen patients were examined. The numbers of patients were recorded as a percentage of the population visiting a general practitioner. Response to migraine prophylactic medications was regarded as supporting evidence of the diagnosis. Response was regarded as a complete resolution of symptoms. Results: Of the 717 patients seen, 12 were identified as having probable or definite MV. Five patients were treated with migraine prophylactic medications, namely amitriptyline 25 mg nocte and/or sodium valproate CR 300 mg bd, and all showed a response to the treatment. Conclusions: We conclude that the prevalence of MV as presenting complaint may be as high as 1.67%. This figure does however not reflect the total patient population that suffers from the condition – this figure may be much higher. Of those patients treated for MV the response was 100%, further supporting the diagnosis. MV is a relevant complaint that is often misdiagnosed as psychogenic in origin.
The student health services at the University of Pretoria from 2000 to 2005
D H van Papendorp,M Coetzee,A M Koorts
Health SA Gesondheid , 2007, DOI: 10.4102/hsag.v12i1.243
Abstract: The University of Pretoria’s Student Health Services provides free, voluntary, family-medicine-orientated health services with an emphasis on offering preventative medicine and health education to enrolled students. ABSTRAK Die Universiteit van Pretoria se Gesondheidsdienste voorsien gratis, vrywillige gesins-medisyne-geori nteerde gesondheidsdienste met die klem op voorkomende medisyne en gesondheidsopvoeding aan ingeskrewe studente.
The Brody effect induced by premature ventricular complexes in the ovine heart
J. Ker,E.C. Webb,D. van Papendorp
Onderstepoort Journal of Veterinary Research , 2010, DOI: 10.4102/ojvr.v76i4.27
Abstract: The QRS response of the electrocardiogram to bleeding has been a source of interest to the physiologist for more than a century. Studies in the dog, cat and chicken have shown a reduction in QRS amplitude in response to bleeding. This effect has been explained by the so-called Brody effect, in which the intraventricular mass of blood acts as a conducting medium, augmenting radial conduction, thus resulting in the subsequent reduction in QRS amplitude in conditions where the intraventricular mass of blood is reduced. The aim of this study was to evaluate whether the Brody effect will be present in the ovine heart and, furthermore, to evaluate if the right and left ventricles will demonstrate the same QRS change if the Brody effect is indeed present. This study clearly demonstrated that the Brody effect is present in the ovine heart. Furthermore, two unique aspects emanating from this study are firstly the fact that this is the first study to show that premature ventricular complexes are able to induce the Brody effect and, secondly that there is a very clear difference in the response of the right and the left ventricles when the Brody effect is induced in the ovine heart.
Immune ablation and stem-cell therapy in autoimmune disease: Experimental basis for autologous stem-cell transplantation
Dirk W van Bekkum
Arthritis Research & Therapy , 2000, DOI: 10.1186/ar103
Abstract: The pivotal role of the haematopoietic system was revealed by investigations in haematopoietic chimeras between rodent strains that are susceptible or resistant to various autoimmune diseases (for review [1]). Whether these chimeric animals develop autoimmune disease is generally dictated by the genotype of the bone marrow, which led to the hypothesis that the underlying defect resides in the haematopoietic stem cell [2]. These experiments were performed with many different models of autoimmune disease, but there is no consensus regarding which models are representative of the corresponding human disease.The animal models of autoimmune disease are of two distinct types: the hereditary or spontaneous forms and the induced forms. In diseases of the first category, the symptoms develop with age in most or all of the members of a particular inbred strain of rodents. These models include systemic lupus erythematosus-like syndromes in mice, insulin-dependent diabetes mellitus in mice and rats, and a complex syndrome of arthritis/colitis/dermatitis in human leucocyte antigen-B27 transgenic rats. Genetic factors dominate in the pathogenesis of these diseases. The autoimmune diseases of the second category do not develop spontaneously, but require induction by immunization with specific tissues (eg brain in the case of experimental allergic encephalomyelitis [EAE], which serves as model of multiple sclerosis), with tissue components like collagen (ie collagen-induced arthritis), or with bacterial antigens like Mycobacteria tuberculosis (adjuvant arthritis [AA]). These diseases can only be induced in specific strains of rodents. Susceptibility and resistance to induction are largely genetically determined, as demonstrated by cross-breeding, but environmental influences are also involved.The aetiology of human autoimmune diseases is multifactorial, the dominant contributors being genetic as well as environmental. Thus, it is likely that the inducible autoimmune diseases repres
‘Een dienblad met bonbons’: de restauratie van de Leidse Sterrewacht
Dirk van Delft
Studium : Tijdschrift voor Wetenschaps- en Universiteits-Geschiedenis , 2011,
Abstract: -
The identification and examination of the elements that caused a schism in the Johannine community at the end of the first century CE
Dirk van der Merwe
HTS Theological Studies/Teologiese Studies , 2009, DOI: 10.4102/hts.v63i3.234
Abstract: A group of people within the Johannine community (2:18) contributed towards destroying the fellowship of this community. Because 1 and 2 John do not provide direct evidence of the identities of the community’s heretically inclined members, they are defined in different ways by different scholars. A search for socio-religious circumstances which contribute towards determin-ing the opponents and adherents of the author which created the agenda for the reconstruction of the phenomena that caused this schism. The nature of the schism comprises “Pneumatological,” “Christological” and “ethical” issues encoded in the polemical language of slogans, dialectic discourse, confessions and denials. The schism in 1 John proves to be a matter of different interpretations of a shared tradition.
Editorial Comments/ Redaksionele Kommentaar
Dirk van der Wal
Health SA Gesondheid , 2004, DOI: 10.4102/hsag.v9i2.158
Abstract: Quality, both as an indicator of excellence and as an attribute/ characteristic of phenomena, implies certain norms, criteria and judgements. Opsomming Kwaliteit, beide as 'n indikator van uitnemendheid en as 'n kenmerk van 'n verskynsel impliseer norme, criteria en beoordeling. *Please note: This is a reduced version of the abstract. Please refer to PDF for full text.
Beware of the pseudogap
Dirk van der Marel
Physics , 2011, DOI: 10.1038/nphys1890
Abstract: In the pseudogap phase of a high-temperature cuprate superconductor, conflicting evidence from different experiments points to a competing state or a precursor-to-superconductivity state. One single experiment now determines that both states exist.
A Preliminary Ray Tracing Approach to Computational Electromagnetics for Reverberation Chambers  [PDF]
Filip Nauwelaerts, Dirk Van Troyen, Guy A. E. Vandenbosch
Journal of Electromagnetic Analysis and Applications (JEMAA) , 2010, DOI: 10.4236/jemaa.2010.28061
Abstract: This paper summarizes a theoretical design analysis for the implementation of an electromagnetic modeling tool, focusing on the simulation of electromagnetic field propagation inside reverberation chambers. The simulation algorithms which have been developed rely on a ray tracing technique, adapted in such a way as to maximize compatibility with the specific requirements and parameters, as applicable for reverberation chambers. The most significant example of a typical parameter is the high rate of wave reflections inside the chambers’ cavity. An implementation of the algorithms was used for simulation of several theoretically predictable cases. Study of the results of these test cases showed that some of the design decisions and algorithms used need to be reviewed in order to optimize the computational aspects of the application, such as resource management (memory, CPU time). Results of typical sample cases are re- viewed in this paper as well, in order to identify possible pitfalls and objectives for future research.
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