ORCID Profile
0000-0001-8569-7668
Current Organisation
Peter MacCallum Cancer Centre
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Publisher: BMJ
Date: 06-02-2019
DOI: 10.1136/BMJ.L239
Publisher: Elsevier BV
Date: 2022
Publisher: Wiley
Date: 10-2016
DOI: 10.1111/IMJ.13207
Publisher: Wiley
Date: 17-06-2022
DOI: 10.1111/JAC.12613
Abstract: Investigating the combined effects of elevated CO 2 concentration and water‐deficit on weed plants is crucial to gaining a thorough understanding of plant performance and modifying agricultural processes under changing climate conditions. This study examined the effect of elevated CO 2 concentration and water‐deficit conditions on leaf gas exchange, water use efficiency, carboxylation efficiency and the photosystem II (PSII) activity of two Salvia verbenaca L., varieties. These varieties were grown under two CO 2 concentrations (ambient conditions of 400 ppm and elevated conditions of 700 ppm) and two water regimes (well‐watered [100% field capacity] and water‐deficit conditions [60% field capacity]) in laboratory growth chambers. For 12 days, at 2‐day intervals, (i) leaf gas exchange parameters (photosynthesis rate, stomatal conductance, transpiration rate (E) and intercellular CO 2 concentration (Ci)), (ii) water use efficiency (WUE), (iii) intrinsic water use efficiency (IWUE), (iv) instantaneous carboxylation efficiency and (v) PSII activity (fluorescence, quantum yield of PSII, photochemical efficiency of PSII, photochemical quenching and photosynthetic electron transport) were measured. Water‐deficit conditions had negative effects on studied parameters of both varieties, whereas elevated CO 2 concentration had positive effects on the gas exchange, water use efficiency and PSII activity of both. Salvia verbenaca varieties grown under water‐deficit conditions from Day 0 to Day 5 showed a partial recovery in most of the parameters when the resumption of the well‐watered regime was reinstituted on Day 6. Salvia verbenaca varieties grown under water‐deficit conditions were re‐watered on day 6 and indicated a partial recovery in all the parameters. A comparison of the two varieties showed that var. vernalis recorded higher values of gas exchange, quantum yield of PSII and photochemical efficiency of PSII than var. verbenaca, but the water use efficiency of var. verbenaca was higher than that of var. vernalis. These differences serve to illustrate the complexity of such studies and suggest that a detailed understanding of the nature of weed infestations is essential if optimum management control is to be practiced. Elevated CO2 concentration mitigated the adverse effects of water‐deficit conditions and thereby enhanced the adaptive mechanism of this weed by improving its water use efficiency. It is thus likely that S. verbenaca has the potential to take advantage of climate change by increasing its relative competitiveness with other plants in drought‐prone areas, suggesting that it could significantly expand its invasive range under such conditions.
Publisher: Wiley
Date: 2019
DOI: 10.1111/IMJ.13800
Abstract: Epidemic thunderstorm asthma (ETSA) refers to large-scale acute bronchospasm events associated with thunderstorm. The most serious episode ever recorded occurred in Melbourne, Australia, in November 2016, where more than 3500 patients were treated in hospitals and 10 died. Previous work has been focused primarily on patient presentations to emergency departments. The prevalence of in iduals with milder, non-emergent symptoms and who may be at risk of more serious episodes in the future has not previously been explored. To characterise the nature and extent of respiratory symptoms in healthcare workers during the Melbourne ETSA event. A survey was conducted among staff and volunteers across Eastern Health, distributed on the intranet homepage, by email and by word of mouth. Anonymous survey questions were constructed to assess prior and current diagnoses of relevance, symptoms, and demography. There were 515 participants (80% female, n = 411) of approximately 9000 potential respondents (~6% response rate) who completed the survey 132 (25.6%) had symptoms suggestive of asthma during the Melbourne ETSA event, the majority of whom did not seek professional medical help. Notably, of those with ETSA-like symptoms, only 58 (43.9%) had a history of asthma, while 97 (73.5%) had a history of allergic rhinitis. Specifically, a history of allergic rhinitis (OR 2.77, P < 0.001), a history of asthma (OR 1.67, P = 0.037) and being of self-identified Asian ethnicity (OR 3.24, P < 0.001) were all strong predictors of ETSA-like symptoms. Being predominantly indoors was not protective. Our study provides evidence of the presence of a large cohort of sufferers during the Melbourne ETSA event of 2016 that did not come to the attention of medical services, implying a potentially hidden and significant susceptible population. Further research should help clarify the true prevalence of vulnerability in the general population, with important public health implications.
Publisher: Wiley
Date: 05-2020
DOI: 10.1111/IMJ.17_14849
Publisher: BMJ
Date: 22-01-2018
DOI: 10.1136/BMJ.K241
Publisher: Wiley
Date: 02-2019
DOI: 10.1111/IMJ.14198
Publisher: Wiley
Date: 04-2021
DOI: 10.1111/IMJ.15145
Publisher: Wiley
Date: 12-2018
DOI: 10.1111/IMJ.14044
Publisher: AMPCo
Date: 10-1996
Publisher: Wiley
Date: 05-2020
DOI: 10.1111/IMJ.9_14849
Publisher: BMJ
Date: 26-06-2018
DOI: 10.1136/BMJ.K2699
Publisher: BMJ
Date: 16-07-2018
DOI: 10.1136/BMJ.K3105
Publisher: Elsevier BV
Date: 09-2020
Publisher: Wiley
Date: 07-2018
DOI: 10.1111/IMJ.13946
No related grants have been discovered for Vikas Wadhwa.