Browsing by Author "Cloete, Karen Jacqueline"
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- ItemOutcomes of adult heroin users v. abstinent users four years after presenting for heroin detoxification treatment(AOSIS Publishing, 2014-08) Khan, Zureida; Cloete, Karen Jacqueline; Harvey, Justin; Weich, LizeBackground. There are no studies in South Africa (SA) on the outcomes following detoxification and psychosocial rehabilitation of heroindependent patients. Objective. To compare the demographic, clinical, forensic and treatment data of active heroin users v. users who were abstinent at the time of interview 4 years after attending the Opioid Detoxification Unit at Stikland Hospital in the Western Cape Province, SA. Method. Participants included patients above the age of 16 years who had been admitted to the Opioid Detoxification Unit at Stikland Hospital for heroin detoxification between July 2006 and June 2007. Participants were individually interviewed (either in person or telephonically) using a structured self-report questionnaire to collect demographic, clinical, forensic and treatment data 4 years following heroin detoxification treatment at this unit. Results. Of the participants, 60% were abstinent and a large portion (34%) attributed this to social support. Furthermore, there was a significant (p=0.04) difference in the longest period of abstinence between the past user group and active users, with more participants in the past user group being abstinent for 18 months or longer (n=24, 57%) than in the active users group (n=8, 29%). Active users (n=18, 64%) had significantly (p=0.03) more legal problems than abstinent users (n=14, 33%). Most participants (n=38, 54%) relapsed within 3 months after index detoxification and rehabilitation. Conclusion. Active users had more legal problems than abstinent users, with social support structures playing a pivotal role in abstinence. Future research should assess the impact of interventions such as post-discharge social support programmes on criminality and heroin use in those that relapse following treatment.
- ItemPhysiological effects of indigenous arbuscular mycorrhizal associations on the sclerophyll Agathosma betulina (Berg.) Pillans(Stellenbosch : University of Stellenbosch, 2011-10) Cloete, Karen Jacqueline; Botha, Alfred; Valentine, A. J.; University of Stellenbosch. Faculty of Science. Dept. of Microbiology.ENGLISH ABSTRACT: The Mountain Fynbos biome, a division of the Cape Floristic Region (CFR), is home to round-leafed Buchu [Agathosma betulina (Berg.) Pillans], one of South Africa’s best-known endangered herbal medicinal plants. Agathosma betulina is renowned as a traditional additive to brandy or tea, which is used for the treatment of a myriad of ailments. In its natural habitat, A. betulina thrives on mountain slopes in acid and highly leached gravelly soils, with a low base saturation and low concentrations of organic matter. To adapt to such adverse conditions, these plants have formed mutualistic symbioses with arbuscular mycorrhizal (AM) fungi. In this study, the effect of indigenous AM taxa on the physiology of A. betulina is investigated. In addition, the AM taxa responsible for these physiological responses in the plant were identified using morphological and molecular techniques. Agathosma betulina was grown under glasshouse conditions in its native rhizosphere soil containing a mixed population of AM fungi. Control plants, grown in the absence of AM fungi, were included in the experimentation. In a time-course study, relative growth rate (RGR), phosphorus (P)-uptake, P utilization cost, and carbon (C)-economy of the AM symbiosis were calculated. The data showed that the initial stages of growth were characterized by a progressive increase in AM colonization. This resulted in an enhanced P-uptake in relation to non-AM plants once the symbiosis was established. Consequently, the lower P utilization cost in AM plants indicated that these plants were more efficient in acquiring P than non-AM plants. When colonization levels peaked, AM plants had consistently higher growth respiration. This indicated that the symbiosis was resulting in a C-cost to the host plant, characterized by a lower RGR in AM plants compared to non-AM plants. Arbuscular mycorrhizal colonization decreased with increasing plant age that coincided with a decline in P-uptake and growth respiration, along with increases in RGR to a level equal to non-AM plants. Consequently, the AM benefit was only observed during the initial stages of growth. In order to identify the AM fungi in planta, morphological and molecular techniques were employed, which indicated colonization by AM fungi belonging to the genera Acaulospora and Glomus. Phylogenetic analyses of a dataset containing aligned 5.8S ribosomal RNA gene sequences from all families within the Glomeromycota, including sequences obtained during the study, supported the above mentioned identification.