Winter cropping often does not realise its full potential in south-western Victoria, where waterlogging is a major problem on the poorly drained soils of conventional cultivation (CC) systems. Consequently, cropping has been undertaken on raised beds (RB) to reduce the risk of waterlogging. Initial reports on the yields of RB were encouraging. It was hypothesized that an improvement in soil properties of RB may account for their better performance compared to CC systems. / The aim of the thesis was to evaluate selected soil physical properties of RB and to make comparisons with other treatments (CC and pasture). The specific objectives were to: 1) evaluate plant growth and crop yield; 2) quantify soil water dynamics; 3) assess changes in the soil water retention characteristic (SWRC), soil strength and soil hydraulic properties; 4) describe pore pathways from solute transport; and 5) quantify soil macropore structure. / Measurements of volumetric water content (θv) were taken at 20, 40, 60 and 80 cm and at the soil surface. These data allowed the determination of the profile soil water deficit (SWD), which was found to be greater under the RB than the CC, although at times the pasture had the largest SWD. The RB mostly remained drier than the CC, but the response to rainfall in the surface θv was similar between treatments. Below average rainfall was received during the whole study period which resulted in drier than normal conditions. / There was no consistent difference in plant growth between crops on the RB and CC; e.g. in 2004 periods of waterlogging resulted in greater dry matter production on the RB; while drier conditions in 2003 saw better crop growth on the CC. Grain yield varied annually according to rainfall, and overall the treatment yields were similar. Analysis of regional yield data showed that there was no yield difference in years with average or below average rainfall, but years with higher rainfall favoured RB. / Little difference was found in the laboratory-derived SWRC, but in the field the RB were consistently drier at all depths and at 60 cm depth the CC had a saturated zone. The RB were found to have a lower soil strength characteristic within the surface 24 cm compared to the CC. The air-filled porosity (AFP) was higher in the RB while for long periods the CC were <10 per cent AFP. There was no significant difference between the treatments in unsaturated hydraulic conductivity (Kus) in the soil surface. Saturated hydraulic conductivity (Ks) in the subsoil was very small, although the RB had significantly greater Ks than the CC. / A solute transport experiment investigated the movement of a solute in large soil cores of the RB and CC treatments. Derived parameters from a transfer function model were used to assess the solute transport characteristics. This showed that under nearly saturated conditions the CC had significantly greater solute spreading than the RB. Furthermore, the transport volume (θst) to θv ratio was smaller in the RB which indicated a greater proportion of preferential flow. These and other data suggested that the RB had a better connected and more stable pore network. / Soil macropore structure was quantified using image analysis of resin-impregnated soil. Samples were taken twice; the first samples showed that the RB had improved pore connectivity, slightly greater porosity and a pore network with smaller sized pore components than the CC. In comparison, at the second sampling time the structural parameters of the two treatments were similar. / Uncertainty exists in the scenario of higher rainfall or of the longer-term changes of soil properties under RB cropping. Nevertheless after three years of measurements, this thesis concludes that most soil physical properties of RB are distinctly better for cropping than under CC systems.

The Problem: Novel community-acquired, non-multiresistant strains of oxacillin- (methicillin-) resistant Staphylococcus aureus (ORSA) have emerged in many parts of the globe. Little is known of the clinical features, the epidemiology, and the antibiotic treatment of these strains. Materials and Methods: A retrospective chart review was performed on patients presenting to Emergency Departments or Dermatology Clinics with staphylococcal infections. Patients were stratified into three groups, non-multiresistant ORSA (NORSA), multiresistant ORSA (MORSA) and oxacillin-susceptible S. aureus, and clinical comparisons made. Strains of NORSA and MORSA were typed using antibiograms, phage typing and pulsed-field gel electrophoresis. Antimicrobial studies were performed to compare different methods of detecting resistance to oxacillin and to non-beta-lactams. Time-kill studies were performed with one drug to explore killing kinetics. The interaction between drug combinations was examined using disk approximation and time-kill methodologies. A single point pharmacodynamic analysis was performed. Results: There was an increase in infections with NORSA, MORSA and OSSA. NORSA strains appeared to be more virulent than OSSA and MORSA strains. NORSA was strongly associated with skin and soft tissue infections and with Polynesians. Most of the NORSA strains were related to New Zealand ????Western Samoan Phage Pattern???? (WSPP) isolates, and unrelated to community-acquired, non-multiresistant MRSA strains from Western Australia. Two patients were found to have British EMRSA-15 strains. NORSA strains were unrelated to MORSA strains. Resistance to rifampicin, fusidic acid, ciprofloxacin and trimethoprim emerged in the time-kill assays. Combinations of antibiotics, particularly with ciprofloxacin, often showed antagonism. Gentamicin, fusidic acid, clindamycin, teicoplanin, vancomycin, and linezolid were predicted to perform well. Ciprofloxacin, erythromycin, doxycycline, flucloxacillin and quinupristin/dalfopristin were predicted to fail. Conclusions: WSPP strains of New Zealand and EMRSA-15 strains from Britain exist in South Western Sydney. These organisms are virulent, and increasing in incidence in several areas of Australia. Antimicrobial treatment of infections with these strains is problematic and requires further study.

The main purpose of this research is to investigate the scouring effect on the west coast of Taiwan that has been caused by the natural disasters and the human activities since 17 centuries. The studies consist of the depicting of maritime topography, the data collection of sea meteorology, and the data mapping with the use of Google Earth software. The present research employed the satellite image data and the achieve maps from literature for accurately quantifying the coastal changes in south-western Taiwan. The changing process of coastal line around the south-western Taiwan including the influences of natural and artificial factors of long and short period is also investigated. The surveys has divided the coastal changes into three periods, 17th century to 1904 A.D., 1940 A.D. to 1945 A.D., and 1945 A.D. to present. In the first period, the isotope dating and historical data we used to identify the coastal line. The results of this research showed that the main element of coastal line shift in the west coast between 17th ~20th century is caused by the sink-transport of enriched river-based sources. During the second period, the data collection with the use of better precision instruments from colonial government, the sea area of Yunlin produced series of shoal from 1904 to 1945. The coast area expanded outward 26 km. On the contrary, the shoals in the sea area of Tainan were shifted inward due to lacking of sink-transport source, but the coasts remained less deposited in this period because the influence of artificial facilities construction. By artificial development, the coast was seriously corroded frequently since 1945 that leaded to the shoals reduction and disappearance. The coast was no longer to receive the sink transport source because of highly artificial coastal development, such as land reclamation, fishing port construction, and coastal protection measures to prevent from further continuously erosion around the coasts. It is necessary to emphasize that the theorem, practical and research aspect can be applied to integrate the coastal plan and development in the future. It is imperative for government to initiative on the aspects of monitoring the topography, river basin, ecology area, and sea meteorology with the use of GIS system to establish database. Moreover, the government should evaluate the feasibility of coast construction, revise the laws to protect coast and provide the guidelines on the coast plan and development in the marine environment. Finally, this research addresses the need of precautionary approach against the natural disaster.

The Problem: Novel community-acquired, non-multiresistant strains of oxacillin- (methicillin-) resistant Staphylococcus aureus (ORSA) have emerged in many parts of the globe. Little is known of the clinical features, the epidemiology, and the antibiotic treatment of these strains. Materials and Methods: A retrospective chart review was performed on patients presenting to Emergency Departments or Dermatology Clinics with staphylococcal infections. Patients were stratified into three groups, non-multiresistant ORSA (NORSA), multiresistant ORSA (MORSA) and oxacillin-susceptible S. aureus, and clinical comparisons made. Strains of NORSA and MORSA were typed using antibiograms, phage typing and pulsed-field gel electrophoresis. Antimicrobial studies were performed to compare different methods of detecting resistance to oxacillin and to non-beta-lactams. Time-kill studies were performed with one drug to explore killing kinetics. The interaction between drug combinations was examined using disk approximation and time-kill methodologies. A single point pharmacodynamic analysis was performed. Results: There was an increase in infections with NORSA, MORSA and OSSA. NORSA strains appeared to be more virulent than OSSA and MORSA strains. NORSA was strongly associated with skin and soft tissue infections and with Polynesians. Most of the NORSA strains were related to New Zealand ????Western Samoan Phage Pattern???? (WSPP) isolates, and unrelated to community-acquired, non-multiresistant MRSA strains from Western Australia. Two patients were found to have British EMRSA-15 strains. NORSA strains were unrelated to MORSA strains. Resistance to rifampicin, fusidic acid, ciprofloxacin and trimethoprim emerged in the time-kill assays. Combinations of antibiotics, particularly with ciprofloxacin, often showed antagonism. Gentamicin, fusidic acid, clindamycin, teicoplanin, vancomycin, and linezolid were predicted to perform well. Ciprofloxacin, erythromycin, doxycycline, flucloxacillin and quinupristin/dalfopristin were predicted to fail. Conclusions: WSPP strains of New Zealand and EMRSA-15 strains from Britain exist in South Western Sydney. These organisms are virulent, and increasing in incidence in several areas of Australia. Antimicrobial treatment of infections with these strains is problematic and requires further study.

Freshwater ecosystems in south-western Australia have been extensively altered over the last two centuries as a result of human activities. The effect this has had on aquatic fauna, particularly invertebrates, is largely unknown because of inadequate knowledge of the pre-existing fauna. Future changes in the composition of aquatic fauna will also go undetected unless current distributions of existing species are well documented. This thesis addresses the problem by investigating the current distributions and conservation status of aquatic insects in south-western Australia from three orders: Odonata, Plecoptera and Trichoptera. Extensive distributional data was collected by identifying larval specimens from a large number of samples collected throughout the south-west as part of an Australia-wide macroinvertebrate bioassessment project. In addition, a database created from a species-level biological study of the wheatbelt region of Western Australia was utilised, and previously published records of occurrence for species within the south-west were compiled. These results were then used to assess the conservation status of each species using the IUCN red list criteria. Environmental parameters measured at time of sampling were also examined using logistic regression to determine which factors are important in influencing the distributions of aquatic insects in south-western Australia. The conservation value of sites based on Odonata, Plecoptera and Trichoptera compositions was also determined and the degree of protection provided for sites of high conservation value investigated.The high rainfall forested region of the south-west was found to be important for a large number of species, including the majority of those found to be rare and/or restricted. Overall, 37% of species were found to be threatened, with the Trichoptera containing both the greatest number and highest proportion of threatened species. Logistic regression results generally agreed with the distributions obtained for each species, with rainfall and other parameters indicative of streams in the headwaters of forested catchments being positively associated with species found to be restricted to the high rainfall region. Two parameters known to be affected by human disturbance in the south-west, conductivity and nutrient concentrations, were found to be important in determining the occurrence of many species and this could have important consequences for aquatic insect conservation. Widespread species occurring within the low rainfall region of the south-west did not show as many significant relationships to measured environmental parameters, possibly due to their greater ecological tolerances and adaptations which allow them to persist in a low rainfall environment. The implications of results are discussed, and recommendations for the conservation and management of aquatic insects in south-western Australia are given.

Thesis (Ph. D.)--University of New South Wales, 2004. / Also available online.

Background: The South Western Sydney Area Health Service (SWSAHS) contains many areas of socio-economic disadvantage and ethnic diversity. It has a high incidence of lung cancer, which is the leading cause of cancer deaths. The aims of this study were to document lung cancer patterns of care (POC) for SWSAHS residents, compare POC before and after the opening of an oncology centre in SWSAHS and compare POC with other areas in NSW. Methods: The study population consisted of SWSAHS residents diagnosed with lung cancer in 1993 and 1996. A clinical audit of medical records was performed to extract details on patient demographics, management of lung cancer and outcomes. Collaborating investigators performed identical studies in the Northern Sydney Area Health Service (NSAHS) and the Hunter Area Health Service (HAHS) for lung cancers diagnosed in 1996. Results: The SWSAHS study population comprised 527 patients. Nine percent did not have a pathological diagnosis. Twelve percent did not see a lung cancer specialist. Twenty-eight percent did not receive any treatment throughout the course of their illness. The median survival was 6.7 months and five-year actuarial survival was 8% (95% CI 6%-10%). Increasing age and poorer performance status were associated with a lower likelihood of obtaining a pathological diagnosis, specialist referral and treatment. Socio-economic factors did not influence POC. The establishment of an oncology center resulted in more referrals to medical oncologists and palliative care services. Other aspects of POC and survival were similar. Variability in POC was noted between SWSAHS, NSAHS and HAHS. HAHS residents were almost twice as likely not to have pathological confirmation of diagnosis or treatment. Despite this survival was not significantly different. Conclusions: This study has identified deficiencies in the management of lung cancer. To improve outcomes, referral to specialists and utilisation of treatment, particularly radiotherapy and chemotherapy, needs to be increased. Ageist and nihilistic attitudes need to be overcome. Prospective data collection is necessary to ensure quality of patient care. The formation of national guidelines for the management of lung cancer will play an important role in achieving better outcomes.

The purpose of this thesis is to examine the educational outcomes of Lebanese-background students in high schools in South-western Sydney, and to investigate some of the factors contributing to their pattern of achievement. The main thrust of this study is to empirically examine in detail two factors which are strong contributors to school achievement. The first is the motivational goals of these students. The second is the Language proficiency of Lebanese-background students in their first language (Arabic) and their second lanaguage (English). The study involves quantitative analyses of two sets of questionnaires administered to all the Year 9 students in three South-western metropolitan Sydney high schools. The Year 10 School Certificate results of this same group of students was then used to measure their level of achievement. Four groups were established for comparison: the non-Lebanese-, English-, Chinese- and Vietnamese- background groups. This study is contextualized within a discussion of some of the family factors which contribute to the achievement of migrant children in schools. Of particular relevance to Lebanese-background students are the socio-economic and educational background of parents, and the historical and social context of the Lebanese in Australia. The thesis concludes by putting forth some recommendations which involve the collaborative efforts of the home, the school and the community, suggesting that part of the solution lies in this collaborative effort. Boundaries can be crossed and stereotypes changed only through a concerted effort by the three sides / Doctor of Philosophy (PhD)

Thesis (MSc)--Stellenbosch University, 2008. / ENGLISH ABSTRACT: The Greater Cederberg Biodiversity Corridor (GCBC) is a large-scale conservation corridor situated in the south-western region of South Africa. Delineation of the GCBC was largely based on by vegetation data. The relevance of the GCBC for the conservation of the reptilian fauna in the area south of 31°S and west of 21°E is assessed in the present study. This entailed determining the GCBC’s coverage of regional reptile diversity patterns and assessing its potential conservation significance during possible climate induced changes in reptile distributions. Reptile species point distribution data from the preliminary (2007) SARCA (South African Reptile Conservation Assessment) database was used. Under-representation of the Tankwa Karoo in the dataset required a field survey of this region. Additionally, the biogeographical influence of the arid Tankwa Karoo Basin on the distribution of reptiles in the south-western districts of South Africa was investigated. Turnover across the Basin is high, species richness is lower than in surrounding mountainous areas and there are no species endemic to the area. The Tankwa Karoo Basin acts as a dispersal barrier for many reptile species occurring in the surrounding more mesic areas. At the same time, the ranges of a number of typical northern, arid adapted species extend southward along the Tankwa Plains. A number of species range extensions in the region are reported. Patterns of endemism, species richness and turnover were plotted from the point distribution data at quarter and eighth degree square resolution. Extensive sampling bias towards reserves and populated areas is apparent from the reptile species richness plots. This pattern is more pronounced for snakes than lizards. Reptile richness is particularly high along the north-south section of the Cape Fold Mountains and also relatively high along the south-western coast, peaking in the Lambert’s Bay area. The majority of the 20 reptile species endemic to the study area are associated with one of two identified centres of endemism: the Greater Cederberg area, or the narrow coastal zone stretching from the Lambert’s Bay area to the Cape Peninsula. An additional third set of endemics comprised of melanistic forms restricted to a number of different refugia, notably, Landroskop, the Cape Peninsula, Sladanha-Langebaan region, Piketberg Mountains and a confined area along the western section of the Cape Fold Mountains. Species richness and endemism patterns co-vary within the study area. Biotic regions were identified through hierarchical clustering of grid cells according to shared species occurrences. A Northern, Southern, Central and Western biotic region was identified. Classification tree methodology (CART) and Canonical Correspondence Analysis (CCA) were used to characterise defined biotic regions in terms of selected environmental variables. Four sets of species assemblages are described on the basis of these biotic regions – two major and two minor ones. Of the major assemblages the Northern assemblage can be described as an arid zone one and the Southern assemblage as a mesic zone one. The minor Central assemblage, comprising mainly rock-dwelling forms, represent evolutionary leftovers as a result of climate change induces cycles of contraction and expansion of arid and mesic faunas. The other minor one, the West Coast assemblage could be considered a sub-assemblage of the Northern one, with particular adaptation to the coastal climate. Environmental characterisation of the biotic regions reveals that these groupings are supported by an environmental signal. The contiguity of four distinct sets of reptiles, each with its own set of environmental requirements, in this relatively small geographic area clearly indicates that the southwestern region of South Africa is biogeographically complex. The GCBC incorporates the largely coinciding centres of endemism and richness along the West Coast and the greater Cederberg area. Although the centre of endemism for melanistic reptile forms, in the Saldanha-Langebaan area, falls just south of the GCBC boundary, the Corridor fulfils the requirements for effective conservation of reptiles in the area to a large degree. The north-south dispersal pathways provided by the Corridor along the Cape Fold Mountains is believed to be adequate to buffer climate change effects, however there is concern about its ability to contribute to the persistence of the assemblage associated with the narrow coastal zone in the west. / AFRIKAANSE OPSOMMING: Die Groter Cederberg Biodiversiteit Korridor (GCBK) is ‘n grootskaalse bewaringskorridor wat in die suid-westelike deel van Suid-Afrika geleë is. Die grense van GCBK is gebasseer op plantegroei data. In die huidige studie word die betekenis van die GCBK vir die bewaring van die reptiel fauna in die gebied suid van 31°S en wes van 21°O assesseer. Die mate waartoe die GCBK die patrone van reptieldiversiteit in die streek inkorporeer, asook die korridor se potensiaal om voorsiening te maak vir reptiel verspreidingsgebiede wat moontlik as gevolg van potensiële omgewingsverandering kan verskuif. Die beskikbare puntverspreidingsdata van die voorlopige (2007) SARCA (South African Reptile Conservation Assessment) databasis is gebruik. Swak verteenwoordiging van die Tankwa Karoo in die datastel het ‘n veldopname van die gebied genoodsaak. Verder is die biogeografiese invloed van die ariede Tankwa Karoo Kom op die verspreidingspatrone van reptiele in die suid-westelike deel van Suid-Afrika ook ondersoek. Die spesie omset van beide Noord na Suid en Wes na Oos oor die Tankwa is hoog, die spesierykheid is aansienlik laer as in die omringende bergagtige gebiede en daar is geen spesies wat endemies is tot die Tankwa Karoo nie. Die Tankwa Karoo Kom dien as ‘n barieêre teen spreiding vir sommige reptielspesies wat in die omringende gematigde gebiede voorkom. Terselfdertyd reik die verspreidings van ‘n aantal tipiese droogte aangepasde spesies vanuit die noorde suidwaarts langs die Tankwa Vlaktes. Nuwe verspredingsrekords wat ‘n paar spesies se gebiede uitbrei word ook raporteer. Die puntverspreidingsdata is geruik om die patrone van endemisme, spesierykheid en omset op kwart- en agtstegraad resolusie te plot. Spesierykheid kaarte toon ‘n duidelike neiging tot deegliker opnames in reservate en bewoonde gebiede. Hierdie patroon is meer opmerklik vir slange as akkedisse. Reptielrykheid is besonders hoog langs die noord-suid as van die Kaapse Plooiberge en ook relatief hoog langs die suid-wes kus met ‘n maksimum in die Lambertsbaai omgewing. Die meerderheid van die 20 reptielspesies wat endemies is aan die studie area is met een van twee geïdentifiseerde sentrums van endemisme geassosieer: die Groter Cederberg area óf die nou kussone wat vanaf Lambertsbaai tot Kaappunt strek. ‘n Derde stel endemiese spesies wat uit melanistiese vorme bestaan, is beperk tot ‘n aantal refugia, naamlik, Landroskop, Kaappunt, Saldanha- Langebaan omgewing, Piketberg berge en ‘n beperkte area langs die westelike dele van die Kaapse Plooiberge. Spesierykheid en endemisme patrone stem grootliks ooreen binne die studie area. Roosterselle is op grond van gedeelde spesiesamestellings met behulp van ‘n hieragiese groeperingsmetode (Incremental Sum of Squares) gegroepeer. Vier bio-areas, nl. ‘n Noordelike-, Suidelike-, Sentrale en Westelike bio-area is identifiseer. Klassifikasieboom metodologie (Classification and Regression Trees, CART) asook Kanoniese Annalises (Cannonical Correspondence Annalysis, CCA) is gebruik om hierdie geografiese areas in terme van ‘n aantal omgewingsveranderlikes te karakteriseer. Vier spesieversamelings, twee groter en twee kleiner versamelings, is in ooreenstemming met hierdie vier areas geïdentifiseer. Die Noordelike en Suidelike spesieversamelings is die groteres en kan beskryf word as die faunas van onderskeidelik ‘n ariede en gematigde sone. Die kleiner Sentrale versameling bestaan hoofsaaklik uit rots-lewende spesies en mag die evolusionêre oorblyfsels verteenwoordig van ariede en gematigde faunas waarvan die verspreidings herhaaldelik as gevolg van klimaatsveranderingsiklusse uitgebrei en gekrimp het. Die Weskus versameling is ook ‘n kleiner een en kan as ‘n sub-versameling van die Noordelike een beskou word, maar spesifiek tot die kus klimaat aangepas. Die klassifikasie van hierdie bio-areas word ondersteun deur die analiese van die omgewingsveranderlikes. Die feit dat vier kenmerkende versamelings reptiele, elk met sy besondere omgewingsvereistes, in hierdie relatief klein geografiese area ontmoet, dui daarop dat die suid-westelike deel van Suid-Afrika biogeografies kompleks is. Die GCBK inkorporeer die grootliks ooreenstemmende sentrums van endemisme en rykheid wat langs die Weskus en in die groter Cederberg area voorkom. Alhoewel die sentrum van melanistiese endemiese spesies, in die Saldanha-Langebaan omgewing, net buite die grense van die Korridor val, voldoen die GCBK grootliks aan die vereistes vir die effektiewe bewaring van reptiele in die gebied. Die voorsiening van noord-suid verspreidingsweë langs die Kaapse Plooiberge binne die Korridor word beskou as voldoende om die gevolge van klimaatsverandering te buffer. Daarinteen is daar kommer oor die vermoeë van die GCKB om ‘n doeltreffende bydrae te maak tot die voortbestaan van die spesieversameling wat met die nou kussone langs die Weskus geassosieer is.

Mémoire numérisé par la Direction des bibliothèques de l'Université de Montréal.