31 results for Conference poster, 2008

  • Cell proliferative and radioprotective properties of bioactive Salvia sclareoides extracts

    Ruivo, D; Oliveira, Maria; Rauter, AP; Justino, J; Goulart, M (2008-11)

    Conference poster
    The University of Auckland Library

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  • Purine Nucleosides as Cholinesterase Inhibitors

    Marcelo, F; Rauter, AP; Blériot, Y; Sinaÿ, P; Oliveira, Maria; Goulart, M; Justino, J (2008-09)

    Conference poster
    The University of Auckland Library

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  • Metabolomics as a novel approach to study mixed species biofilms of stream bacteria exhibiting mutualistic and antagonistic responses

    Washington, Vidya; Villas-Boas, Silas; Lewis, Gillian (2008-08-17)

    Conference poster
    The University of Auckland Library

    Experimental objective / Purpose 1. To investigate the metabolic interactions of bacterial species using metabolic footprint profiling. 2. As proof of concept, microbes exhibiting mutualistic and antagonistic associations were chosen for this study.

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  • Effects of Storm water metal contaminats on microbial communities in stream biofilm revealed by Automated Ribosomal Intergenic Spacer Analysis (ARISA)

    Ancion, Pierre; Lear, Gavin; Lewis, Gillian (2008-08-17)

    Conference poster
    The University of Auckland Library

    Stormwater metal contaminants are known to be a threat to our freshwater environments but little is known about their effects on stream micro-organisms. This project investigates accumulation and release of the most common stormwater metal contaminants (zinc, copper and lead) in stream biofilms and their effects on bacterial populations.

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  • Afferent axonal pathfinding in developing chicken rhomboencephalon

    Kubke, Maria; Wild, JM (2008)

    Conference poster
    The University of Auckland Library

    The developing hindbrain of vertebrates i organized in a series of rhombomeres, each giving rise to specifi c nuclei. The role of this segmentation has been extensively studied with respect to the origin of motor nuclei. The development of afferent innervation, however, has received little attention. Afferent axons enter the brainstem prior to the migration of their central targets and must therefore navigate in the absence of target derived information. Since the target nuclei for each afferent component originates within discrete rhombomeric boundaries, it is possible that the same positional information that is used by neuronal progenitors to defi ne their fi nal fate, may be available to afferent axons to direct them through their initial growth. This study was aimed at determining the normal sequence that characterises the growth of afferent axons in the hindbrain within the context of the site of origin and of the organisation of second order sensory neurons within specifi c rhombomere boundaries. Afferent axons were labelled at different embryonic ages using fl uorescent lipophilic dyes. Crystals of DiI and/or DiO were placed on specifi c exposed nerves or nerve branches of fi xed embryos. Embryos were incubated at 30 C for 18 hrs, after which the hindbrains were dissected, cleared in glycerol and analysed as whole-mount preparations with confocal microscopy. Afferent axons formed a series of fascicles that extended longitudinally along the alar plate, beyond the rhombomeric boundaries that give rise to their target nuclei. At early stages, the degree of organization and segregation of afferent axons did not appear to refl ect the adult patterns. Thus, it appears that the appropriate pathfi nding and fi nal segregation of the afferent components involves an initial profuse growth into the hindbrain, and that proper afferent patterning involves axon retraction and may require the initiation of migration if the central targets towards their fi nal position.

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  • A synthetic study towards aryl 6,6-spiroacetal analogues of rubromycin

    Choi, Peter; Rathwell, DC; Brimble, Margaret (2008)

    Conference poster
    The University of Auckland Library

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  • What drives bacterial community structure in stream biofilms?

    Roberts, Kelly; Lear, Gavin; Turner, Susan; Lewis, Gillian (2008-08-17)

    Conference poster
    The University of Auckland Library

    BACKGROUND The microorganisms within biofilms are the key basal trophic level within most freshwater systems. However, microbial structure, function and succession in natural stream systems remain poorly understood. This research characterises the biofilm community structure of stream biofilms experiencing different anthropogenic impacts and how they change over time. Our aim is describe the changes in bacterial biofilm communities over time and to investigate what drives these changes.

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  • Can tree weta detect terrestrial bats

    Lomas, Kathryn; Field, LH; Wild, John; Kubke, Maria; Parsons, Stuart (2008-10)

    Conference poster
    The University of Auckland Library

    Interactions between insects and bats are well-known examples of predator-prey co-evolution. For example, moths have evolved hearing abilities that allow them to respond to sounds in the ultrasound range, thus enabling them to detect the echolocation calls of hunting bats and perform evasive manoeuvres (Roeder 1998). Although New Zealand insects are preyed upon by endemic bats, no studies have examined whether they possess similar strategies for predator avoidance. If auditory information is used to detect and avoid predation, then the frequencies of greatest sensitivity of the auditory organ are predicted to correspond to the echolocation frequency (or other hunting-related sounds) produced by predatory bats. New Zealand has two endemic bats, the long tailed bat (Chalinolobus tuberculatus) and lesser short tailed bat (Mystacina tuberculata). Long tailed bats are typical aerial insectivores and are not known to prey on weta.

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  • Stream Restoration: Getting the microbial ecology right.

    Lewis, Gillian; Lear, Gavin; Turner, Susan; Boothroyd, Ian; Stott, Rebecca; Roberts, Kelly; Ancion, Pierre; Dopheide, Andrew; Washington, Vidya; Knight, Duane; Smith, Joanna (2008-08-17)

    Conference poster
    The University of Auckland Library

    A comprehensive program to re-establish the structure and function of an ecosystem, including its natural diversity and aquatic habitats.

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  • A novel implantable blood pressure telemetry device: Comparison between Data Sciences and Telemetry Research systems

    Malpas, Simon; Lim, M; McCormick, John; Kirton, RS; Van Vliet, B; Easteal, Allan; Barrett, Carolyn; Guild, Sarah-Jane; Budgett, David (2008-04-05)

    Conference poster
    The University of Auckland Library

    The pending expiry (May 2008) of a Data Sciences (DSI) patent in the area of blood pressure telemetry permits the development of alternative technologies. A key aspect in providing new telemetry systems is a comparison to existing technology. Important aspects include stability of the calibration over time and the ability to capture the pulsitile blood pressure waveform. In a group of 6 rats and 5 rabbits DSI blood pressure transmitters (C40 or D70 models) were implanted in conjunction with Telemetry Research (TR) transmitters. Both systems incorporate a fluid filled catheter of similar dimensions with a biocompatible gel in the tip. The blood pressure waveform was collected via telemetry for up to 2 months after implantation. The signal was sampled at 500 Hz and digitally transmitted to a receiver up to 5 m away The battery of TR transmitter was recharged within the rat using inductive power transfer technology. The pulsitile waveform associated with each heart beat was reflected similarly in all cases although the frequency response of DSI telemeters was limited to ~40 Hz (–3 dB rolloff point). The calibrated offset level between the two transmitters was not more than 5 mmHg at all times over a 2 month period. We conclude that the Telemetry Research blood pressure transmitters offer comparable performance to existing technology but with extra design advantages (rechargeable, co-housing of animals, greater range).

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  • Benefits of speech & language therapy for hearing impaired children

    Fairgray, Liz; Purdy, Suzanne (2008)

    Conference poster
    The University of Auckland Library

    Conference details: Reflecting Connections 2008, the second conference jointly hosted by the New Zealand Speech-Language Therapists Association and Speech Pathology Australia. Held at the SKYCITY Convention Centre in Auckland, New Zealand, from the 25th to the 29th of May, 2008. http://www.reflectingconnections.co.nz/ Although the need for speech and language therapy is widely recognized for children who are hearing impaired, there is little research evidence for improved outcomes after specific speech and language therapy interventions. With improvements in hearing aid and cochlear implant technology, and consequently improved access to the speech signal, there has been greater emphasis on listening-based therapies. The most widely used therapy is referred to as “auditory-verbal therapy” (AVT). This approach is endorsed by the Alexander Graham Bell Association, but there is paucity of research evidence for AVT effectiveness (Rhoades, 1982; Goldberg & Flexer, 1993; Wray et al., 1997; Rhoades & Chisholm, 2000). Previous studies have focused on psychosocial and educational outcomes of AVT, rather than measuring specific speech and language outcomes. The current study investigates speech and language, speech perception in noise and reading abilities before and after a 6-month period of weekly AVT with an experienced Certified Auditory-Verbal and Speech-language Therapist. Participants are eight children aged 5 to 17 years with moderate-profound sensorineural hearing loss using cochlear implants (CI) and/or hearing aids.

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  • Safety and efficacy of a superantigen based vaccine carrier in human MHC II-CD4 transgenic mice

    Radcliff, FJ; Munro, GH; Fraser, JD (2008-12-08)

    Conference poster
    The University of Auckland Library

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  • A new implantable transmitter for simultaneous recording of sympathetic nerve activity and blood pressure

    Lim, M; McCormick, John; Kirton, RS; Budgett, David; Kondo, Masahiro; Pallas, Wayne; Guild, Sarah-Jane; Barrett, Carolyn; Malpas, Simon (2008-04-05)

    Conference poster
    The University of Auckland Library

    •Over activity of the sympathetic nervous system has been implicated in a number of cardiovascular diseases. •The direct recordings of sympathetic nerve activity (SNA) in conscious animals in combination with blood pressure provides ideal platform for exploring the role of SNA in the disease process. •While a telemetry system has been developed to enable recording of SNA it has required the implantation of a separate transmitter to record blood pressure. •We have now developed wireless implantable transmitters capable of simultaneously recording arterial blood pressure and sympathetic nerve activity.

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  • Ciliate Diversity in Stream Biofilms revealed by group-specific PCR primers.

    Dopheide, Andrew; Lear, Gavin; Stott, R; Lewis, Gillian (2008-08-17)

    Conference poster
    The University of Auckland Library

    The ciliates are a diverse protozoan phylum, thought to be of considerable ecological importance in stream ecosystems, including organisms which are abundant and important consumers of bacteria, algae and other protozoa. Understanding of ciliate diversity and ecology is limited, however, particularly in benthic habitats such as stream biofilms. In this study, phylum-specific PCR primers were used in combination with cloning, sequencing and terminal restriction fragment length polymorphism (T-RFLP) analysis to investigate ciliate communities in stream biofilms.

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  • Human Adenovirus ecology in environmental waters in New Zealand

    Dong, Yimin; Lewis, Gillian (2008-08-17)

    Conference poster
    The University of Auckland Library

    A major New Zealand study of pathogen occurrence in surface freshwaters identified occurrence of human adenovirus in 30% of sites and samples by qualitative PCR based methods. The source or nature of these viruses was not clear from the study and raises important questions in both viral ecology and human health protection. The aim of this study was to begin to unravel these questions by (i) development of specific quantitative analysis methods for adenoviruses in water and (ii) to target identifiable groups of adenovirus associated with human respiratory or gastrointestinal infections. These quantitative group specific real time PCR methods were tested in drinking water, recreational water, river water and wastewater. Adenovirus was detected in all primary wastewater samples tested (n=10) at high genome copy number (1.87 x104 to 4.6 x106 per litre) and in 33% (n=15) of the river water and 11% (n=27) of the treated drinking water samples. In addition, adenovirus was detected in 5 of the 6 estuarine recreational water samples (17 to 1190 virus genome copies per litre). DNA sequence analysis suggested that human adenovirus group C (respiratory infection associated) were most commonly associated with river, recreational and drinking water. Group F adenovirus (gastroenteritis associated viruses) were found to dominate in most wastewater (5 - 100 % total adenovirus) but were not detected in surface waters. This study suggests that the ecology of specific groups or types of adenovirus is sufficiently different, external to the host, to have important implications for human health risk assessment.

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  • An examination of the extent of adult neurogenesis in the carpet shark (Cephaloscyllium isabellum)

    Finger, JSH; Kubke, Maria; Wild, JM; Montgomery, JC (2008)

    Conference poster
    The University of Auckland Library

    Following Altman’s and Kirsche’s challenge to the dogma that no new neurons could be produced during adulthood in the 1960’s, adult neurogenesis was shown in most vertebrate lineages. From a phylogenetic point of view, adult neurogenesis is not an uncommon event, having been demonstrated in reptiles and birds, amphibians, bony fi shes and mammals. At present, however, adult neurogenesis has not been examined in cartilagineous fi shes, the stem line of vertebrates. Sharks are an ideal group in which to study the extent of adult neurogenesis for several reasons: (i) they exhibit continuous body growth throughout life; (ii) in the stingray the number of peripheral axons and neurons continues to increase into adult life; and (iii) in adult gray reef sharks the number of inner ear hair cells also continues to increase. We have begun to evaluate the extent of adult neurogenesis in the carpet shark (Cephaloscyllium isabellum). A specimen of C isabellum was injected i.p. with 230 mg/kg of BrdU, anaesthetised and perfused after 2 hrs. The brain was cryoprotected and cut at 40 μm, and processed following standard immunocytochemical techniques. BrdU was found in a small number of nuclei in close proximity to the ventricular surface, in a similar position than occasional cells labelled with an antibody aginst β-tubuline (III). Some BrdU labelled nuclei were also found throughout the brain that were not stained with our neuronal marker. These preliminary data suggest that adult neurogenesis occurs in sharks and that like in bony fi shes, but unlike birds and mammals, it may also occur in non-telencephalic areas. If widespread adult neurogenesis can be unequivocally demonstrated in sharks, it would indicate that it represents the primitive condition. This therefore raises the question of what modifi cations in brain evolution of modern vertebrate lineages led to the restriction of this ability to specifi c forebrain areas.

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  • Baby, Baby: Pregnant Again After Postnatal Depression

    Cowie, Susan (2008-09-10)

    Conference poster
    The University of Auckland Library

    Depression following birth has wide ranging impacts on the woman, her new baby and her family. Studies indicate that treatment has been effective in shortening the duration of depression but does not prevent the increased risk of experiencing depression following another birth. This study explores in detail women’s and practitioners understandings of first time mother’s experiences of and recovery from depression and then focus on how the women prepare for and make sense of the experience of second time pregnancy and motherhood. It is hoped to develop strategies to reduce recurrence and impact of depression in women with young children. Results are presented of interviews with 25 women who had previously experienced post natal depression. Interviews were conducted 3-6 months before birth, focusing firstly on how the women make sense of their transition to first time motherhood and coping with/recovery from depression and secondly, on their expectations of second time birth and motherhood. The second interview, completed 3 months after birth, focused on their experience of the pregnancy, birth, and life with another child. Qualitative methodologies were employed. Of particular interest were the things that women described as helpful and unhelpful, their understanding of the help/treatment (e.g. Home help, CBT, support group, Arapax) they had gained and how this influenced their decisions and coping second time round. Preliminary analyses, particularly of time one data (collection complete), are reported and issues related to the study design and implementation are discussed.

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  • Use of whole-community bacterial indicators to monitor ecological health, function and variability within freshwater stream biofilms.

    Lear, Gavin; Smith, Joanna; Roberts, Kelly; Boothroyd, Ian; Lewis, Gillian (2008-08-17)

    Conference poster
    The University of Auckland Library

    This study describes the extent of variability in biofilm bacterial community structure across a broad range of spatial and temporal scales and assesses whether this may be used as an indicator of stream ecological health and function. A community DNA fingerprinting technique (Automated Ribosomal Intergenic Spacer Analysis - ARISA) was used to examine the structure of bacterial communities within freshwater stream biofilms. When compared with macrobenthic invertebrate community assemblages using multi-dimensional scaling techniques, similar broad-scale trends in population structure were revealed between organisms at these different trophic levels. For both communities, spatial variability in community structure was greater between streams than within each site, or compared to temporal variability measured over 1 year. Distance-based redundancy analysis of both bacterial ARISA and macroinvertebrate data estimated that the largest cause of variation in community structure was due to differences in catchment land-use, rather than any single water quality parameter (e.g. ph or ammoniacal nitrogen). Multidimensional scaling of ARISA data also revealed significant differences in community structure between urban, and less impacted stream sites, providing evidence that whole-bacterial communities could be used as an indicator of freshwater ecological health, analogous to the way that macroinvertebrate communities have been used for many years. In conclusion, we propose the analysis of whole bacterial communities as a cost-effective, high throughput alternative indicator of freshwater ecological health.

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  • An Approach for Evaluating Robustness of Edge Operators using Real-World Driving Scenes

    Al-Sarraf, Ali; Vaudrey, Tobi; Klette, Reinhard; Woo, Young Woon (2008)

    Conference poster
    The University of Auckland Library

    Conference Details: 2008 23rd International Conference Image and Vision Computing New Zealand Lincoln University, Christchurch, 26-28 November 2008. http://www.lvl.co.nz/ivcnz2008/ Over the past 20 years there have been many papers that compare and evaluate di erent edge operators. Most of them focus on accuracy and also do comparisons against synthetic data. This paper focuses on real-world driver assistance scenes and does a comparison based on robustness. The three edge operators compared are Sobel, Canny and the under-publicized phase-based Kovesi-Owens operator. The Kovesi- Owens operator has the distinct advantage that it uses one pre-selected set of parameters and can work across almost any type of scene, where as other operators require parameter tuning. The results from our comparison show that the Kovesi-Owens operator is the most robust of the three, and can get decent results, even under weak illumination and varying gradients in the images. Keywords: edge operators, edge robustness evaluation, Kovesi-Owens, phase operators

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  • A Variant of Adaptive Mean Shift-Based Clustering

    Li, Fajie; Klette, Reinhard (2008)

    Conference poster
    The University of Auckland Library

    Conference Details: ICONIP 2008 - 15th International Conference on Neural Information. Processing of the Asia-Pacific Neural Network Assembly November 25-28, 2008, Auckland, New Zealand We are interested in clustering sets of highly overlapping clusters. For example, given is an observed set of stars (considered to be a set of points); how to find (recover) clusters which are the contributing galaxies of the observed union of those clusters? Below we propose a modification of an adaptive mean shift-based clustering algorithm (called Algorithm 1) proposed in 2003 by B. Geogescu, I. Shimsoni and P. Meer

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