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https://www.readbyqxmd.com/read/28970174/antimicrobial-and-antibiofilm-activities-of-nanoemulsions-containing-eucalyptus-globulus-oil-against-pseudomonas-aeruginosa-and-candida-spp
#1
Priscilla Maciel Quatrin, Camila Marina Verdi, Márcia Ebling de Souza, Samantha Nunes de Godoi, Bruna Klein, Andre Gundel, Roger Wagner, Rodrigo de Almeida Vaucher, Aline Ferreira Ourique, Roberto Christ Vianna Santos
Candida species are the main responsible microorganisms for causing fungal infections worldwide, and Candida albicans is most frequently associated with infectious processes. Pseudomonas aeruginosa is a gram-negative bacterium commonly found in immunocompromised patients. The infection persistence caused by these microorganisms is often related to antimicrobial resistance and biofilm formation. In this context, the objective of the present study was to prepare and characterize nanoemulsions containing Eucalyptus globulus oil and to verify its antimicrobial and antibiofilm activities against P...
September 29, 2017: Microbial Pathogenesis
https://www.readbyqxmd.com/read/28917870/ultra-high-pressure-modified-cellulosic-fibres-with-antimicrobial-properties
#2
Ana M Salgueiro, Mauro D Santos, Jorge A Saraiva, Filipe Almeida, Isabel Sousa, João Tedim, Helena I S Nogueira, Dmitry V Evtuguin
In this work bleached E. globulus kraft pulp was doped with polyhexamethylene biguanide (PHMB) from an aqueous solution or from a suspension of silica capsules (PHMB@silica) by impregnation under atmospheric or ultra-high pressure (UHP) conditions (500MPa). The antimicrobial properties of pulps were evaluated towards gram-negative E. coli and gram-positive L. innocua bacteria. PHMB loads below 500mg per kg of pulp revealed negligible bacteriostatic properties, whereas PHMB loads of ca 3000-4000mg per kg demonstrated bactericidal properties of pulp without significant deterioration of its mechanical strength...
November 1, 2017: Carbohydrate Polymers
https://www.readbyqxmd.com/read/28916319/inhibition-of-growth-and-biofilm-formation-of-clinical-bacterial-isolates-by-nio-nanoparticles-synthesized-from-eucalyptus-globulus-plants
#3
Samia Saleem, Bilal Ahmed, Mohammad Saghir Khan, Majed Al-Shaeri, Javed Musarrat
Nanotechnology based therapeutics has emerged as a promising approach for augmenting the activity of existing antimicrobials due to the unique physical and chemical properties of nanoparticles (NPs). Nickel oxide nanoparticles (NiO-NPs) have been suggested as prospective antibacterial and antitumor agent. In this study, NiO-NPs have been synthesized by a green approach using Eucalyptus globulus leaf extract and assessed for their bactericidal activity. The morphology and purity of synthesized NiO-NPs determined through various spectroscopic techniques like UV-Visible, FT-IR, XRD, EDX and electron microscopy differed considerably...
October 2017: Microbial Pathogenesis
https://www.readbyqxmd.com/read/28898992/amphistomatic-leaf-surfaces-independently-regulate-gas-exchange-in-response-to-variations-in-evaporative-demand
#4
Freya Richardson, Timothy J Brodribb, Gregory J Jordan
The occurrence of amphistomatic leaves (stomata on both surfaces) versus hypostomatic leaves (stomata limited to the lower or abaxial surface) has strong associations with environment. Amphistomy provides the advantage of higher conductance of CO2 for photosynthesis, however, unless the stomata on both leaf surfaces can be independently controlled in response to environmental cues, amphistomy may lead to inefficient gas exchange. While previous studies have found evidence that stomata can operate independently across and between surfaces of dorsiventral leaves, we investigate whether an independent stomatal response can be induced for isobilateral leaves by largely natural conditions...
July 1, 2017: Tree Physiology
https://www.readbyqxmd.com/read/28800692/does-the-developmental-stage-and-composition-of-riparian-forest-stand-affect-ecosystem-functioning-in-streams
#5
Sahadevan Seena, Francisco Carvalho, Fernanda Cássio, Cláudia Pascoal
A common watershed restoration practice to improve water quality and stream ecosystem functions and services is replanting riparian corridors with plant species that may differ from those of natural communities. This restoration practice may have consequences on the aquatic ecosystem processes because organisms obtain energy from leaf litter inputs of the riparian zones. Leaf litter decomposition in streams is a vital ecosystem-level process, which depends on the activity of microorganisms and invertebrates...
December 31, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/28770050/resource-allocation-tradeoffs-in-caddisflies-facing-multiple-stressors
#6
Francisco Correa-Araneda, Ana Basaguren, Roberto T Abdala-Díaz, Alan Mosele Tonin, Luz Boyero
The replacement of native forests by exotic tree monocultures, such as those of Eucalyptus, decreases the quality of leaf litter inputs to streams and often reduces riparian cover, which can elevate water temperature. The combined effects of these stressors on the survival and performance of detritivores may be important, as detritivore species loss leads to reduced litter breakdown, a key ecosystem process. Potential loss of cased caddisfly larvae is of particular concern because they are the predominant detritivores in many streams, they are sensitive to warming, and they expend energy on building and carrying their cases, which may be an added burden under times of stress...
July 2017: Ecology and Evolution
https://www.readbyqxmd.com/read/28709043/improvement-effects-of-cytokinin-on-edta-assisted-phytoremediation-and-the-associated-environmental-risks
#7
Jie Luo, Limei Cai, Shihua Qi, Jian Wu, X W Sophie Gu
Soil samples containing excess Cd (0.82 mg kg(-1)), Pb (92.7 mg kg(-1)) and Cu (72.7 mg kg(-1)) relative to their corresponding safe thresholds (0.3, 80 and 50 mg kg(-1), respectively) from a notorious e-waste disposing and recycling place in southern China were phytoremediated with EDTA addition to evaluate the promotion effects of cytokinin on the remediation efficiency of Eucalyptus globulus. Biomass production of the plant, evapotranspiration amount of the soil, metals accumulation in plant organs and the volume of leachate under various treatments were compared...
October 2017: Chemosphere
https://www.readbyqxmd.com/read/28691021/evaluation-of-stability-and-in-vitro-security-of-nanoemulsions-containing-eucalyptus-globulus-oil
#8
Samantha Nunes de Godoi, Priscilla Maciel Quatrin, Michele Rorato Sagrillo, Kátia Nascimento, Roger Wagner, Bruna Klein, Roberto Christ Vianna Santos, Aline Ferreira Ourique
Essential oil of Eucalyptus globulus presents several pharmacological properties. However, their therapeutic efficacy may be affected by limitations due to several conditions, rendering it difficult to obtain stable and effective pharmaceutical formulations. The use of nanotechnology is an alternative to improve their characteristics aiming to ensure their stability and effectiveness. Furthermore, studies about the possible toxic effects of nanostructures are necessary to evaluate safety when the formulation comes into contact with human cells...
2017: BioMed Research International
https://www.readbyqxmd.com/read/28679070/microsatellite-analysis-of-population-structure-in-eucalyptus-globulus
#9
Joana Costa, René E Vaillancourt, Dorothy A Steane, Rebecca C Jones, Cristina Marques
Eucalyptus globulus subsp. globulus Labill. (Tasmanian Blue Gum), native to southeast Australia, is a benchmark species for the pulp and paper industry. We genotyped 397 trees from 16 populations of E. globulus representing the native diversity in Australia using 24 microsatellite loci. Eight genetically distinct groups were detected, consistent with genetic groupings detected in previous quantitative and molecular studies. A sample of 29 Portuguese individuals was added to help clarify the origin of the Portuguese landrace...
July 5, 2017: Genome Génome / Conseil National de Recherches Canada
https://www.readbyqxmd.com/read/28637361/antioxidant-activity-of-phenolic-compounds-from-extracts-of-eucalyptus-globulus-and-melaleuca-styphelioides-and-their-protective-role-on-d-glucose-induced-hyperglycemic-stress-and-oxalate-stress-in-nrk-49fcells
#10
Divya Ganesan, Eman Al-Sayed, Abhishek Albert, Eldho Paul, Abdel Nasser B Singab, Selvam Govindan Sadasivam, Luciano Saso
Phytochemicals serve as potential therapeutic agents for the prevention and treatment of diseases. In this study, we elucidate the renoprotective activity of compounds isolated from Eucalyptus globulus and Melaleuca styphelioides extracts in glucose- and oxalate-challenged NRK-49F cell model. The antioxidant potential of isolated compounds was evaluated based on their effect on antioxidant enzyme activities and lipid peroxidation levels. The results demonstrated that exposure of NRK-49F cells to glucose and oxalate stress augmented cell damage and attenuated antioxidant enzyme activities...
June 21, 2017: Natural Product Research
https://www.readbyqxmd.com/read/28611658/neuroprotective-and-anti-aging-potentials-of-essential-oils-from-aromatic-and-medicinal-plants
#11
REVIEW
Muhammad Ayaz, Abdul Sadiq, Muhammad Junaid, Farhat Ullah, Fazal Subhan, Jawad Ahmed
The use of essential oils (EOs) and their components is known since long in traditional medicine and aromatherapy for the management of various diseases, and is further increased in the recent times. The neuroprotective and anti-aging potentials of EOs and their possible mechanism of actions were evaluated by numerous researchers around the globe. Several clinically important EOs and their components from Nigella sativa, Acorus gramineus, Lavandula angustifolia, Eucalyptus globulus, Mentha piperita, Rosmarinus officinalis, Jasminum sambac, Piper nigrum and so many other plants are reported for neuroprotective effects...
2017: Frontiers in Aging Neuroscience
https://www.readbyqxmd.com/read/28561806/genetic-based-interactions-among-tree-neighbors-identification-of-the-most-influential-neighbors-and-estimation-of-correlations-among-direct-and-indirect-genetic-effects-for-leaf-disease-and-growth-in-eucalyptus-globulus
#12
J Costa E Silva, B M Potts, A R Gilmour, R J Kerr
An individual's genes may influence the phenotype of neighboring conspecifics. Such indirect genetic effects (IGEs) are important as they can affect the apparent total heritable variance in a population, and thus the response to selection. We studied these effects in a large, pedigreed population of Eucalyptus globulus using variance component analyses of Mycosphearella leaf disease, diameter growth at age 2 years, and post-infection diameter growth at ages 4 and 8 years. In a novel approach, we initially modeled IGEs using a factor analytic (FA) structure to identify the most influential neighbor positions, with the FA loadings being position-specific regressions on the IGEs...
September 2017: Heredity
https://www.readbyqxmd.com/read/28541536/acclimation-of-light-and-dark-respiration-to-experimental-and-seasonal-warming-are-mediated-by-changes-in-leaf-nitrogen-in-eucalyptus-globulus
#13
K Y Crous, G Wallin, O K Atkin, J Uddling, A Af Ekenstam
Quantifying the adjustments of leaf respiration in response to seasonal temperature variation and climate warming is crucial because carbon loss from vegetation is a large but uncertain part of the global carbon cycle. We grew fast-growing Eucalyptus globulus Labill. trees exposed to +3 °C warming and elevated CO2 in 10-m tall whole-tree chambers and measured the temperature responses of leaf mitochondrial respiration, both in light (RLight) and in darkness (RDark), over a 20-40 °C temperature range and during two different seasons...
August 1, 2017: Tree Physiology
https://www.readbyqxmd.com/read/28514868/phytochemical-composition-and-in-vitro-screening-of-the-antimicrobial-activity-of-essential-oils-on-oral-pathogenic-bacteria
#14
Roberta Tardugno, Federica Pellati, Ramona Iseppi, Moreno Bondi, Giacomo Bruzzesi, Stefania Benvenuti
In this study, the activity of essential oils (EOs) against microorganisms involved in oral diseases was evaluated. Fourteen EOs were selected and subjected to gas chromatographic analysis, including Illicium verum, Eucaliptus globulus, Eugenia caryophyllata, Leptospermum scoparium, Mentha arvensis, Mentha piperita, Myrtus communis, Salvia officinalis, Melaleuca alternifolia, Rosmarinus officinalis, Lavandula x intermedia, Thymus capitatus and Thymus vulgaris. These EOs were tested for their antimicrobial activity on Streptococcus mutans and Lactobacillus species clinically isolated from dental surgery patients...
May 17, 2017: Natural Product Research
https://www.readbyqxmd.com/read/28500552/adsorption-of-terpenic-compounds-onto-organo-palygorskite
#15
Sana Ghrab, Mabrouk Eloussaief, Stéphanie Lambert, Samir Bouaziz, Mourad Benzina
Essential oils from aromatic plants are currently mentioned as suitable tools for excellent protection of stored grains from insect pest attacks. The present work aimed to study the processes of the synthesis insecticidal formulation with clay. The active terpenic compounds of essential oil of Eucalyptus globulus (Eg) were fixed in the palygorskite by adsorption process. Two sample types of palygorskites were used: raw and organo-palygorskite. The palygorskite clays were characterized by different physicochemical techniques including X-ray diffraction (XRD), Fourier transform infrared (FTIR) analyses, thermogravimetric analysis (TG), differential thermal analysis (DTA), Brunauer-Emmet-Teller (BET), and scanning electron microscope (SEM)...
May 13, 2017: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/28490520/carbon-allocation-to-growth-and-storage-in-two-evergreen-species-of-contrasting-successional-status
#16
Frida I Piper, Paulina Sepúlveda, Angela Bustos-Salazar, Alejandra Zúñiga-Feest
PREMISE OF THE STUDY: A prevailing hypothesis in forest succession is that shade-tolerant species grow more slowly than shade-intolerant species, across light conditions, because they prioritize carbon (C) allocation to storage. We examined this hypothesis in a confamilial pair of species, including one of the fastest-growing tree species in the world (Eucalyptus globulus) and a shade-tolerant, slow-growing species (Luma apiculata). METHODS: Seedlings were subjected to one out of four combinations of light (high vs...
May 10, 2017: American Journal of Botany
https://www.readbyqxmd.com/read/28433908/steam-torrefaction-of-eucalyptus-globulus-for-producing-black-pellets-a-pilot-scale-experience
#17
Luis E Arteaga-Pérez, Héctor Grandón, Mauricio Flores, Cristina Segura, Stephen S Kelley
Steam torrefaction of Eucalyptus globulus was performed at temperatures between 245°C and 265°C in a 100kg/h pilot plant. Torrefied biomass was then pelletized in a 300kg/h unit and the pellets were subject to durability, density and combustion tests. The structural changes measured with FTIR were studied along with the combustion behavior of the materials. Compositional analysis showed that increasing the torrefaction temperature reduced both hemicellulose fraction and overall mass yield (MY). Furthermore, there was a linear relationship between the energy yield (EY) and mass yield (EY=[1...
August 2017: Bioresource Technology
https://www.readbyqxmd.com/read/28431297/nano-zirconia-evaluation-of-its-antioxidant-and-anticancer-activity
#18
Siripireddy Balaji, Badal Kumar Mandal, Shivendu Ranjan, Nandita Dasgupta, Ramalingam Chidambaram
Bioactivity of nanomaterials largely depends on its size, shape and crystalline nature. In this work, the smaller sized spherical shaped nano-zirconia (ZrO2 NPs) (of ~9 to 11nm) was fabricated and studied its biological activity especially antioxidant and cytotoxicity against human colon carcinoma (HCT-116) and human lung carcinoma (A-549) cell lines. To have its real applications in biological aspects readily available Eucalyptus globulus (E. globulus) leaf extract was used as an effective capping and reducing agent for its synthesis...
May 2017: Journal of Photochemistry and Photobiology. B, Biology
https://www.readbyqxmd.com/read/28388878/medium-term-water-deficit-elicits-distinct-transcriptome-responses-in-eucalyptus-species-of-contrasting-environmental-origin
#19
Antanas V Spokevicius, Josquin Tibbits, Philippe Rigault, Marc-Alexandre Nolin, Caroline Müller, Andrew Merchant
BACKGROUND: Climatic and edaphic conditions over geological timescales have generated enormous diversity of adaptive traits and high speciation within the genus Eucalyptus (L. Hér.). Eucalypt species occur from high rainfall to semi-arid zones and from the tropics to latitudes as high as 43°S. Despite several morphological and metabolomic characterizations, little is known regarding gene expression differences that underpin differences in tolerance to environmental change. Using species of contrasting taxonomy, morphology and physiology (E...
April 7, 2017: BMC Genomics
https://www.readbyqxmd.com/read/28296357/antibacterial-antifungal-and-antiviral-effects-of-three-essential-oil-blends
#20
Amandine Brochot, Angèle Guilbot, Laïla Haddioui, Christine Roques
New agents that are effective against common pathogens are needed particularly for those resistant to conventional antimicrobial agents. Essential oils (EOs) are known for their antimicrobial activity. Using the broth microdilution method, we showed that (1) two unique blends of Cinnamomum zeylanicum, Daucus carota, Eucalyptus globulus and Rosmarinus officinalis EOs (AB1 and AB2; cinnamon EOs from two different suppliers) were active against the fourteen Gram-positive and -negative bacteria strains tested, including some antibiotic-resistant strains...
August 2017: MicrobiologyOpen
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