A5007725593- Glioma Diagnosis and Treatment
- Brain Metastases and Treatment
- Plant responses to elevated CO2
- Plant Water Relations and Carbon Dynamics
- Atmospheric chemistry and aerosols
- Meningioma and schwannoma management
- Advanced Radiotherapy Techniques
- Photosynthetic Processes and Mechanisms
- Marine and coastal ecosystems
- Vascular Malformations Diagnosis and Treatment
- Light effects on plants
- Plant Stress Responses and Tolerance
- Lung Cancer Research Studies
- Intracranial Aneurysms: Treatment and Complications
- Esophageal Cancer Research and Treatment
- Lung Cancer Treatments and Mutations
- Coral and Marine Ecosystems Studies
- Medical Imaging Techniques and Applications
- Plant Molecular Biology Research
- Ocean Acidification Effects and Responses
- Paleontology and Stratigraphy of Fossils
- Bioenergy crop production and management
- Colorectal and Anal Carcinomas
- Colorectal Cancer Treatments and Studies
- Atmospheric Ozone and Climate
University of Essex
2006-2024
University of Toronto
1992-2015
Sunnybrook Health Science Centre
1991-2015
Health Sciences Centre
2004-2015
Princess Margaret Cancer Centre
2008-2015
Canadian Wildlife Federation
2010-2012
Sports Concussion Institute
2012
Montreal Neurological Institute and Hospital
2010-2012
Toronto Metropolitan University
2012
Lahey Hospital and Medical Center
2010
Abstract The effects of elevated [CO 2 ] on 25 variables describing soybean physiology, growth and yield are reviewed using meta‐analytic techniques. This is the first meta‐analysis to our knowledge performed a single crop species summarizes 111 studies. These primary studies include numerous forms, various stress experimental treatments, range levels (from 450 1250 p.p.m.), with mean 689 p.p.m. across all Stimulation leaf CO assimilation rate at was 39%, despite 40% decrease in stomatal...
<h2>Abstract</h2> Purpose: To determine the maximum acutely tolerable dose of single fraction radiosurgery in patients with recurrent previously irradiated primary brain tumors or metastases. Methods and Materials: Between August 1990 September 1993, 102 analyzable were entered on Radiation Therapy Oncology Group (RTOG) protocol 90-05, 38 whom had (median prior 60 Gy), 64 metastases 30 Gy) ≤ 40 mm diameter. Unacceptable toxicity was defined as irreversible Grade 3, any 4, 5 central nervous...
Abstract A lower than theoretically expected increase in leaf photosynthesis with long‐term elevation of carbon dioxide concentration ([CO 2 ]) is often attributed to limitations the capacity plant utilize additional photosynthate, possibly resulting from restrictions rooting volume, nitrogen supply or genetic constraints. Field‐grown, nitrogen‐fixing soybean indeterminate flowering might therefore be escape these limitations. Soybean was grown emergence grain maturity ambient air (372 µ mol...
ABSTRACT Photosynthesis is commonly stimulated in grasslands with experimental increases atmospheric CO 2 concentration ([CO ]), a physiological response that could significantly alter the future carbon cycle if it persists long term. Yet an acclimation of photosynthetic capacity suggested by theoretical models and short‐term experiments completely remove this effect . Perennial ryegrass ( Lolium perenne L. cv. Bastion) was grown under elevated [CO ] 600 µ mol −1 for 10 years using F ree A...
Occurrences whereby cnidaria lose their symbiotic dinoflagellate microalgae (Symbiodinium spp.) are increasing in frequency and intensity. These so-called bleaching events most often related to an increase water temperature, which is thought limit certain Symbiodinium phylotypes from effectively dissipating absorbed excitation energy that otherwise used for photochemistry. Here, we examined photosynthetic characteristics hydrogen peroxide (H2 O2 ) production, a possible signal involved...
We investigated the effect of elevated partial pressure CO 2 (pCO ) on photosynthesis and growth four phylotypes (ITS2 types A1, A13, A2, B1) from genus Symbiodinium , a diverse dinoflagellate group that is important, both free‐living in symbiosis, for viability cnidarians thus potentially important model group. The response to an pCO was phylotype‐specific. Phylotypes A1 B1 were largely unaffected by doubling ; contrast, rate A13 photosynthetic capacity A2 increased ~ 60%. In no case there...
Summary Although stomata are typically found in greater numbers on the abaxial surface, wheat flag leaves have densities adaxial surface. We determine impact of this less common stomatal patterning gaseous fluxes using a novel chamber that simultaneously measures both leaf surfaces. Using combination differential illuminations and CO 2 concentrations at each we mesophyll cells associated with surface higher photosynthetic capacity than those which is supported by an increased conductance...
Purpose: Pseudoprogression (psPD) is now recognised following radiotherapy with concurrent temozolomide (RT/TMZ) for glioblastoma multiforme (GBM). The aim of this study was to determine the incidence psPD RT/TMZ and effect on prognosis. Materials/Methods: All patients receiving newly diagnosed GBM were identified from a prospective database. Clinical radiographic data retrospectively reviewed. Early progression defined as radiological (RECIST criteria) during or within eight weeks...
Summary Mechanistic understanding of the costs and benefits photoacclimation requires knowledge how photophysiology is affected by changes in molecular structure chloroplast. We tested hypothesis that light dependencies photosynthesis, nonphotochemical quenching PSII photoinactivation arises from abundances chloroplast proteins Emiliania huxleyi strain CCMP 1516 grown at 30 (Low Light; LL ) 1000 (High HL μmol photons m −2 s −1 photon flux densities. Carbon‐specific light‐saturated gross...
• Using the Poplar Free Air CO2 Enrichement (PopFACE) facility we investigated effects of elevated [CO2] on diurnal and growth cycle responses photosynthesis conductance in three poplar species. In situ measurements were made Populus alba, P. nigra ×euramericana and, parallel, vivo maximum capacity for carboxylation (Vc,max) rates electron transport (Jmax) determined by gas exchange measurement. Light saturated (Asat) daily integrated (A′) increased at all Elevated decreased Vc,max Jmax...
Abstract Averaged across many previous investigations, doubling the CO2 concentration ([CO2]) has frequently been reported to cause an instantaneous reduction of leaf dark respiration measured as efflux. No known mechanism accounts for this effect, and four recent studies have shown that measurement respiratory efflux is prone experimental artifacts could account response. Here, these are avoided by use a high-resolution dual channel oxygen analyzer within open gas exchange system measure O2...
ABSTRACT Poplar trees sustain close to the predicted increase in leaf photosynthesis when grown under long‐term elevated CO 2 concentration ([CO ]). To investigate mechanisms underlying this response, carbohydrate accumulation and protein expression were determined over four seasons of growth. No levels soluble carbohydrates was observed young expanding or mature sun leaves three poplar genotypes during period. However, substantial increases starch all [CO ]. Despite very high levels, no...
Instrumentation and methods for rapid screening selection of plants with improved water use efficiency are essential to address current issues global food fuel security. A new imaging system that combines chlorophyll fluorescence thermal has been developed generate images assimilation rate (A), stomatal conductance (gs), intrinsic (WUEi) from whole or leaves under controlled environmental conditions. This is the first demonstration production WUEi determine gs themography at whole-plant...
A high-density plantation of three genotypes Populus was exposed to an elevated concentration carbon dioxide ([CO2]; 550 μmol mol−1) from planting through canopy closure using a free-air CO2 enrichment (FACE) technique. The FACE treatment stimulated gross primary productivity by 22 and 11% in the second third years, respectively. Partitioning extra (C) among C pools different turnover rates is critical interest; thus, we calculated net ecosystem (NEP) determine whether atmospheric [CO2] will...
One of the major drawbacks to doing stereotactic radiosurgery with a linear accelerator is long time required deliver target dose. Single fractions 25 Gy delivered at isocenter and depth in skull may require beam times excess 15 min for typical maximum dose rate 250 cGy/min tissue. In an effort decrease treatment this technique, flattening filter has been removed from AECL Therac‐6 characteristics resulting have measured. Flatness acceptable field sizes used technique increased by factor 2.75.
Summary The C 3 plant Rhazya stricta is native to arid desert environment zones, where it experiences daily extremes of heat, light intensity (PAR) and high vapour pressure deficit ( VPD ). We measured the photosynthetic parameters in R. its assess mechanisms that permit survive these extreme conditions. Infrared gas exchange analysis examined diel changes assimilation A ), stomatal conductance g s ) transpiration E on mature leaves stricta. / c i was used determine effect temperature...
The rapid induction of the bundle sheath cell (BSC)-specific expression ASCORBATE PEROXIDASE2 ( APX2 ) in high light (HL)-exposed leaves Arabidopsis thaliana is, part, regulated by hormone abscisic acid (ABA) produced vascular parenchyma cells. In this study, we provide more details ABA signalling that regulates and consider its importance photosynthetic responses BSCs whole leaves. This was done using a combination analyses gene chlorophyll fluorescence both individual mesophyll regulation...
1. The photosynthetic response to elevated CO 2 and nutrient stress was investigated in Agrostis capillaris, Lolium perenne Trifolium repens grown an open‐top chamber facility for years under two regimes. Acclimation evaluated by measuring the of light‐saturated photosynthesis changes substomatal concentration. 2. Growth at resulted reductions apparent Rubisco activity vivo all three species, which were associated with total leaf nitrogen content on a unit area basis A. capillaris L. ....
SUMMARY The photosynthetic capacity of mature leaves increases after several days’ exposure to constant or intermittent episodes high light (HL) and is manifested primarily as changes in chloroplast physiology. How this chloroplast‐level acclimation HL initiated controlled unknown. From expanded Arabidopsis leaves, we determined HL‐dependent transcript abundance 3844 genes a 0–6 h time‐series transcriptomics experiment. It was hypothesized that among such were those contribute the initiation...
Radiosurgery has been advocated as a salvage treatment for relapsed patients with brain metastases. This report describes phase I/II study of radiosurgery previously treated whole irradiation. The was opened in March 1989 and the last patient July 1992. All have followed to recurrence at radiosurgically site or death. Twenty progressing metastases 12 were using 14 radiosurgical procedures. radiation dose always 25 Gy 90% isodose volume encompassing all enhancing tumour. Nineteen evaluable +4...