ORCID Profile
0000-0001-7316-125X
Current Organisations
University College London
,
Universidade de São Paulo Escola Superior de Agricultura Luiz de Queiroz
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Publisher: Springer Science and Business Media LLC
Date: 12-12-2017
Publisher: Springer Science and Business Media LLC
Date: 30-08-2017
Publisher: Wiley
Date: 20-09-2013
DOI: 10.1111/AAB.12066
Publisher: Daedalus Enterprises
Date: 12-2011
Abstract: Intubation and mechanical ventilation can impair mucociliary clearance and cause secretion retention, airway occlusion, atelectasis, and pneumonia. Animal and laboratory work has demonstrated that mechanical ventilator settings can generate a flow bias (inspiratory or expiratory) that may result in mucus movement either away from the ventilator (deeper into the lungs) or toward the ventilator (toward the mouth), respectively. An absolute difference of 17 L/min, and a relative difference of ≥ 10%, between the expiratory and inspiratory flow have been reported as thresholds for mucus movement. We measured baseline peak inspiratory and expiratory flows during quiet mechanical ventilation in a convenience s le of 20 intubated and ventilated adult patients. Nineteen patients had an inspiratory flow bias of ≥ 10%. Eight patients had an absolute mean inspiratory flow bias of ≥ 17 L/min. Commonly used mechanical ventilator settings generate an inspiratory flow bias that may promote secretion retention.
Publisher: Springer Science and Business Media LLC
Date: 06-2015
Publisher: FapUNIFESP (SciELO)
Date: 08-2013
Publisher: Wiley
Date: 28-01-2011
DOI: 10.1111/J.1438-8677.2010.00438.X
Abstract: Tomato high pigment (hp) mutants represent an interesting horticultural resource due to their enhanced accumulation of carotenoids, flavonoids and vitamin C. Since hp mutants are known for their exaggerated light responses, the molecules accumulated are likely to be antioxidants, recruited to deal with light and others stresses. Further phenotypes displayed by hp mutations are reduced growth and an apparent disturbance in water loss. Here, we examined the impact of the hp1 mutation and its near isogenic line cv Micro-Tom (MT) on stomatal conductance (gs), transpiration (E), CO(2) assimilation (A) and water use efficiency (WUE). Detached hp1 leaves lost water more rapidly than control leaves, but this behaviour was reversed by exogenous abscisic acid (ABA), indicating the ability of hp1 to respond to this hormone. Although attached hp1 leaves had enhanced gs, E and A compared to control leaves, genotypic differences were lost when water was withheld. Both instantaneous leaf-level WUE and long-term whole plant WUE did not differ between hp1 and MT. Our results indicate a link between exaggerated light response and water loss in hp1, which has important implications for the use of this mutant in both basic and horticultural research.
Publisher: Springer Science and Business Media LLC
Date: 21-08-2015
DOI: 10.1007/S11356-015-5204-1
Abstract: Increased agriculture production associated with intense application of herbicides, pesticides, and fungicides leads to soil contamination worldwide. Nickel (Ni), due to its high mobility in soils and groundwater, constitutes one of the greatest problems in terms of environmental pollution. Metals, including Ni, in high concentrations are toxic to cells by imposing a condition of oxidative stress due to the induction of reactive oxygen species (ROS), which damage lipids, proteins, and DNA. This study aimed to characterize the Ni antioxidant response of two tolerant Burkholderia strains (one isolated from noncontaminated soil, SNMS32, and the other from contaminated soil, SCMS54), by measuring superoxide dismutase (SOD), catalase (CAT), glutathione reductase (GR), and glutathione S-transferase (GST) activities. Ni accumulation and bacterial growth in the presence of the metal were also analyzed. The results showed that both strains exhibited different trends of Ni accumulation and distinct antioxidant enzymes responses. The strain from contaminated soil (SCMS54) exhibited a higher Ni biosorption and exhibited an increase in SOD and GST activities after 5 and 12 h of Ni exposure. The analysis of SOD, CAT, and GR by nondenaturing PAGE revealed the appearance of an extra isoenzyme in strain SCMS54 for each enzyme. The results suggest that the strain SCMS54 isolated from contaminated soil present more plasticity with potential to be used in soil and water bioremediation.
Publisher: Springer Science and Business Media LLC
Date: 25-09-2014
Publisher: Springer Science and Business Media LLC
Date: 27-07-2018
DOI: 10.1007/S11356-018-2778-4
Abstract: This work aimed to develop a reliable and fast approach to estimate the plant tolerance degree to heavy metal (HM) phytotoxicity. Two independent experiments were carried out using tomato accessions, with contrasting morphological features, that were grown in a hydroponic solution containing different CdCl
Publisher: Springer Science and Business Media LLC
Date: 11-10-2021
DOI: 10.1038/S41598-021-99710-1
Abstract: This work aimed to investigate the partial K-replacement by Na supply to alleviate drought-induced stress in Eucalyptus species . Plant growth, leaf gas exchange parameters, water relations, oxidative stress (H 2 O 2 and MDA content), chlorophyll concentration, carbon (C) and nitrogen (N) isotopic leaf composition (δ 13 C and δ 15 N) were analyzed. Drought tolerant E. urophylla and E. camaldulensis showed positive responses to the partial K substitution by Na, with similar dry mass yields, stomatal density and total stomatal pore area relative to the well K-supplied plants under both water conditions, suggesting that 50% of the K requirements is pressing for physiological functions that is poorly substituted by Na. Furthermore, E. urophylla and E. camaldulensis up-regulated leaf gas exchanges, leading to enhanced long-term water use efficiency (WUE L ). Moreover, the partial K substitution by Na had no effects on plants H 2 O 2 , MDA, δ 13 C and δ 15 N, confirming that Na, to a certain extent, can effectively replace K in plants metabolism. Otherwise, the drought-sensitive E. saligna species was negatively affected by partial K replacement by Na, decreasing plants dry mass, even with up-regulated leaf gas exchange parameters. The exclusive Na-supplied plants showed K-deficient symptoms and lower growth, WUE L , and δ 13 C, besides higher Na accumulation, δ 15 N, H 2 O 2 and MDA content.
Location: United Kingdom of Great Britain and Northern Ireland
Location: Brazil
Location: Brazil
Location: United Kingdom of Great Britain and Northern Ireland
No related grants have been discovered for Ricardo Antunes Azevedo.