ORCID Profile
0000-0002-7378-8084
Current Organisations
HRH Princess Chulabhorn College of Medical Science
,
CSIRO Queensland Bioscience Precinct
,
CSIRO
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Publisher: Elsevier BV
Date: 11-1990
Publisher: CSIRO Publishing
Date: 1994
DOI: 10.1071/MF9940035
Abstract: Seasonal, diel and tidal cycles of beam-trawl catches of juvenile tiger prawns, Penaeus semisulcatus, from an intertidal seagrass bed in the Embley River, Gulf of Carpentaria, were studied at three-week intervals between August 1981 and August 1982. Two seasonal peaks in catches of P. semisulcatus were recorded around November and April. Split-plot analysis of variance showed that after seasonal variation was removed, catches were influenced by day-night and tidal cycles. Few P. semisulcatus juveniles were caught during the day, and more were caught around low tide than around high tide. Results from drop-trap s ling at low tide showed that juvenile P. semisulcatus remained in the seagrass bed even when it became exposed and the water temperature exceeded 35°C. These findings, and practical considerations, suggest that to study long-term changes in relative abundance of juvenile P. semisulcatus with beam trawls, s ling should be completed at night and during the early part of the flood tide.
Publisher: Springer Science and Business Media LLC
Date: 08-2001
Publisher: CSIRO Publishing
Date: 1987
DOI: 10.1071/MF9870029
Abstract: Recruitment patterns of postlarvae immigrating into mangrove nursery areas of five major estuaries around the south-eastern Gulf of Carpentaria, as well as juveniles emigrating offshore into coastal waters, were compared for the banana prawn, Penaeus merguiensis, from September 1978 to March 1979.. Although considerable variability was observed among rivers, some basic recruitment patterns were discernible. Recruitment of postlarvae tended to follow a 28-day cycle with increased immigration on alternate spring tides. Variability between rivers in the number of resident juvenile prawns at any one s ling time resulted mainly from differences in the relative magnitude of postlarval settlement from these monthly cohorts. After the first heavy rainfall of the monsoon season, the lower reaches of rivers with !xger catchment areas a!! ran fresh, setthg up a physica! barrier to further past larval immigration. In contrast, post larval immigration continued throughout the study period in the river with the smallest catchment. There was a trend for more successful immigration earlier in the more northern rivers. Offshore emigration was influenced by rainfall, tide height and number of resident juvenile prawns at the time of emigration. The relative importance of these three factors differed among rivers, depending on the timing of rainfall in relation to the timing of juvenile population changes and the degree of flooding. These local differences in the timing of emigration of juveniles could be detected in the abundance and size of adolescent prawns in the offshore coastal area of the south-eastern Gulf which in turn influenced the size composition of prawns available to the commercial fishery.
Publisher: Elsevier BV
Date: 09-2004
Publisher: Hobart, Tas., CSIRO Div. of Marine Research
Date: 2001
Publisher: Inter-Research Science Center
Date: 1998
DOI: 10.3354/MEPS162201
Publisher: Inter-Research Science Center
Date: 1995
DOI: 10.3354/MEPS118139
Publisher: Inter-Research Science Center
Date: 1998
DOI: 10.3354/MEPS163021
Publisher: Wiley
Date: 11-09-2023
DOI: 10.1002/JMRS.617
Abstract: In this study, we aimed to investigate the feasibility of gadoxetate low‐temporal resolution (LTR) DCE‐MRI for voxel‐based hepatic extraction fraction (HEF) quantification for liver sparing radiotherapy using a deconvolution analysis (DA) method. The accuracy and consistency of the deconvolution implementation in estimating liver function was first assessed using simulation data. Then, the method was applied to DCE‐MRI data collected retrospectively from 64 patients (25 normal liver function and 39 cirrhotic patients) to generate HEF maps. The normal liver function patient data were used to measure the variability of liver function quantification. Next, a correlation between HEF and ALBI score (a new model for assessing the severity of liver dysfunction) was assessed using Pearson's correlation. Differences in HEF between Child‐Pugh score classifications were assessed for significance using the Kruskal–Wallis test for all patient groups and Mann–Whitney U ‐test for inter‐groups. A statistical significance was considered at a P ‐value .05 in all tests. The results showed that the implemented method accurately reproduced simulated liver function root‐mean‐square error between estimated and simulated liver response functions was 0.003, and the coefficient‐of‐variance of HEF was %. HEF correlation with ALBI score was r = −0.517, P 0.0001, and HEF was significantly decreased in the cirrhotic patients compared to normal patients ( P 0.0001). Also, HEF in Child‐Pugh B/C was significantly lower than in Child‐Pugh A ( P = 0.024). The study demonstrated the feasibility of gadoxetate LTR‐DCE MRI for voxel‐based liver function quantification using DA. HEF could distinguish between different grades of liver function impairment and could potentially be used for functional guidance in radiotherapy.
Publisher: Inter-Research Science Center
Date: 1992
DOI: 10.3354/MEPS087215
Publisher: Elsevier
Date: 2020
Publisher: Inter-Research Science Center
Date: 2002
DOI: 10.3354/MEPS228165
Publisher: Inter-Research Science Center
Date: 1996
DOI: 10.3354/MEPS131115
Publisher: Elsevier BV
Date: 07-2003
Publisher: Elsevier BV
Date: 10-2003
Publisher: CSIRO Publishing
Date: 2008
DOI: 10.1071/MF07234
Abstract: Knowledge of the vertical migration behaviour of postlarval penaeid prawns is important in understanding postlarval migration from offshore spawning grounds to estuarine nursery areas. We s led throughout several 24-h periods in two estuaries in Australia to assess the distribution of postlarvae in the water column. We used four trawl nets: one net in the top 0.5 m of the water column and three nets one above the other, from the seabed to 0.72 m above the seabed. Penaeus plebejus was abundant in catches in the Nerang River, southern Queensland, while Penaeus semisulcatus, Penaeus esculentus and Penaeus merguiensis were caught in the Embley River, northern Queensland. For all species, the highest catches at the surface were on night flood tides. Many postlarvae in the Embley River were caught in nets above the seabed on ebb tides, suggesting that net migration patterns cannot be determined simply by s ling surface waters. The vertical distribution of penaeid postlarvae is determined primarily by tide and day/night however, water turbidity and cloud cover, factors that reduce light at the seabed, are also likely to be important. All these aspects of postlarval behaviour should be included in hydrodynamic models of larval advection from spawning grounds to inshore nursery areas.
Publisher: Elsevier BV
Date: 1999
Publisher: Elsevier BV
Date: 03-2009
Publisher: Ovid Technologies (Wolters Kluwer Health)
Date: 2006
DOI: 10.1519/R-15304.1
Publisher: Inter-Research Science Center
Date: 1996
DOI: 10.3354/MEPS145043
Publisher: CSIRO Publishing
Date: 2008
DOI: 10.1071/MF07090
Abstract: Abundance and catchability are crucial quantities in fisheries management, yet they are very difficult to estimate, particularly for short-lived invertebrates. Using two distinct approaches – a standard non-hierarchical model (NH) and a hierarchical Bayesian model (HB) – abundance and catchability coefficients from a fishery depletion process for banana prawns (Penaeus merguiensis) in northern Australia were estimated. Non-hierarchical models treated each stock and year separately and in idually, whereas the hierarchical models assumed some form of common underlying population from which the parameters for the in idual cases generated by the combination of stock and year were drawn. Two HBs were considered. In HB1 it was assumed that annual abundance and catchability parameters came from separate populations, or distributions, for each stock. In HB2 it was assumed that these stock region distributions were not separate, but had their parameters drawn from a common distribution. Thus in HB2 all stocks shared information at the regional level. The results for both NH and HB methods were similar in most cases, indicating a fair degree of stability irrespective of the particular form of model chosen. However, the NH method suffered because the data were analysed in generally small sections and in many cases these sections were too small to allow precise estimation of both parameters and confidence intervals. The deviations of point estimates between the HB1, HB2 and NH models were more marked in catchability coefficient estimates than in abundance estimates, and large relative deviations typically occurred in stock regions and years with low fishing efforts, low catch or poor depletion trends over time. We conclude that the combined analysis using HB was superior because it could handle limited data, yielded credible interval estimates for all parameters and was computationally more efficient.
Publisher: Wiley
Date: 10-02-2023
DOI: 10.1002/ACM2.13928
Abstract: Intratumoral heterogeneity is associated with poor outcomes in head and neck cancer (HNC) patients owing to chemoradiotherapy resistance. [ 18 F]‐FDG positron emission tomography (PET) / Magnetic Resonance Imaging (MRI) provides spatial information about tumor mass, allowing intratumor heterogeneity assessment through histogram analysis. However, variability in quantitative PET/MRI parameter measurements could influence their reliability in assessing patient prognosis. Therefore, to use standardized uptake value (SUV) and apparent diffusion coefficient (ADC) parameters for assessing tumor response, this study aimed to measure SUV and ADC's variability and assess their relationship in HNC. First, ADC variability was measured in an in‐house diffusion phantom and in five healthy volunteers. The SUV variability was only measured with the NEMA phantom using a clinical imaging protocol. Furthermore, simultaneous PET/MRI data of 11 HNC patients were retrospectively collected from the National Cyclotron and PET center in Chulabhorn Hospital. Tumor contours were manually drawn from PET images by an experienced nuclear medicine radiologist before tumor volume segmentation. Next, SUV and ADC's histogram were used to extract statistic variables of ADC and SUV: mean, median, min, max, skewness, kurtosis, and 5 th , 10 th , 25 th , 50 th , 75 th , 90 th , and 95 th percentiles. Finally, the correlation between the statistic variables of ADC and SUV, as well as Metabolic Tumor volume and Total Lesion Glycolysis parameters was assessed using Pearson's correlation. This pilot study showed that both parameters’ maximum coefficient of variation was 13.9% and 9.8% in the phantom and in vivo, respectively. Furthermore, we found a strong and negative correlation between SUV max and ADV med ( r = −0.75, P = 0.01). The SUV and ADC obtained by simultaneous PET/MRI can be potentially used as an imaging biomarker for assessing intratumoral heterogeneity in patients with HNC. The low variability and relationship between SUV and ADC could allow multimodal prediction of tumor response in future studies.
Publisher: Oxford University Press (OUP)
Date: 06-1985
Publisher: Inter-Research Science Center
Date: 1992
DOI: 10.3354/MEPS087201
Publisher: Inter-Research Science Center
Date: 1986
DOI: 10.3354/MEPS027239
Publisher: Elsevier BV
Date: 11-2005
Publisher: Inter-Research Science Center
Date: 1996
DOI: 10.3354/MEPS135043
Publisher: CSIRO Publishing
Date: 1999
DOI: 10.1071/MF99038
Abstract: The juveniles of red-legged banana prawns Penaeus indicus and white banana prawns P. merguiensis are difficult to distinguish. Gel electrophoresis, with the enzyme malate dehydrogenase, clearly separated into species both large and small prawns. Four morphological characters were measured from juvenile prawns (identified using electrophoresis): three of these provided reliable separation into species. The mean ratio of the distance from the anterior-most dorsal rostral tooth (first tooth) to the tip of the rostrum (L 1 ): to the distance between this tooth and the second tooth (L 1,2 ) was higher for P. indicus (3.16) than P. merguiensis (1.56). All juvenile P. indicus had the first tooth posterior to the antennular peduncle, while it was anterior for all P. merguiensis. More than 90% of P. indicus had six rostral teeth behind the eye, while over 90% of P. merguiensis had five teeth behind the eye. Damage to the rostrum prevented measurements of the position of the first tooth in 20 to 30% of juvenile prawns. Combining the measurements of the ratio of L 1 : L 1,2 and the count of the number of rostral teeth behind the eye meant that all prawns could be unambiguously identified.
Publisher: Inter-Research Science Center
Date: 1985
DOI: 10.3354/MEPS023015
Publisher: Elsevier BV
Date: 06-2007
Publisher: Elsevier BV
Date: 07-2023
Location: Thailand
Location: Australia
No related grants have been discovered for David Vance.