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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
#1
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...
May 24, 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
#2
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
#3
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
#4
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
#5
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...
April 11, 2017: Bioresource Technology
https://www.readbyqxmd.com/read/28431297/nano-zirconia-evaluation-of-its-antioxidant-and-anticancer-activity
#6
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...
April 8, 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
#7
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
#8
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...
March 14, 2017: MicrobiologyOpen
https://www.readbyqxmd.com/read/28281322/chemical-composition-antibacterial-antibiofilm-and-synergistic-properties-of-essential-oils-from-eucalyptus-globulus-labill-and-seven-mediterranean-aromatic-plants
#9
Maria Vieira, Lucinda J Bessa, M Rosário Martins, Sílvia Arantes, António P S Teixeira, Ângelo Mendes, Paulo Martins da Costa, Anabela D F Belo
Essential oils (EOs) from Eucalyptus globulus Labill. ssp. globulus and from Mediterranean autochthonous aromatic plants - Thymus mastichina L., Mentha pulegium L., Rosmarinus officinalis L., Calamintha nepeta (L.) Savi ssp. nepeta, Cistus ladanifer L., Foeniculum vulgare L., Dittrichia viscosa (L.) Greuter ssp. viscosa - were extracted by hydrodistillation and characterized by GC-FID and NMR spectroscopy. EOs were evaluated for antimicrobial properties against several bacterial strains, using diverse methods, namely, the agar disc-diffusion method, the microdilution method, the crystal violet assay and the Live/Dead staining for assessment of biofilm formation...
March 9, 2017: Chemistry & Biodiversity
https://www.readbyqxmd.com/read/28278036/emission-factors-of-particulate-matter-polycyclic-aromatic-hydrocarbons-and-levoglucosan-from-wood-combustion-in-south-central-chile
#10
Jorge Jimenez, Oscar Farias, Roberto Quiroz, Jorge Yañez
In south-central Chile, wood stoves have been identified as an important source of air pollution in populated areas. Eucalyptus (Eucalyptus globulus), Chilean oak (Nothofagus oblique), and mimosa (Acacia dealbata) were burned in a single-chamber slow-combustion wood stove at a controlled testing facility located at the University of Concepción, Chile. In each experiment, 2.7-3.1 kg of firewood were combusted while continuously monitoring temperature, exhaust gases, burn rate, and collecting particulate matter samples in Teflon filters under isokinetic conditions for polycyclic aromatic hydrocarbon and levoglucosan analyses...
February 22, 2017: Journal of the Air & Waste Management Association
https://www.readbyqxmd.com/read/28190676/insights-into-temperature-modulation-of-the-eucalyptus-globulus-and-eucalyptus-grandis-antioxidant-and-lignification-subproteomes
#11
Marília Gabriela de Santana Costa, Paulo Mazzafera, Tiago Santana Balbuena
Eucalyptus grandis and Eucalyptus globulus are among the most widely cultivated trees, differing in lignin composition and plantation areas, as E. grandis is mostly cultivated in tropical regions while E. globulus is preferred in temperate areas. As temperature is a key modulator in plant metabolism, a large-scale proteome analysis was carried out to investigate changes in the antioxidant system and the lignification metabolism in plantlets grown at different temperatures. Our strategy allowed the identification of 3111 stem proteins...
May 2017: Phytochemistry
https://www.readbyqxmd.com/read/28173560/application-of-near-infrared-spectroscopy-for-estimation-of-non-structural-carbohydrates-in-foliar-samples-of-eucalyptus-globulus-labilladi%C3%A3-re
#12
A G Quentin, T Rodemann, M-F Doutreleau, M Moreau, N W Davies, Peter Millard
No abstract text is available yet for this article.
January 31, 2017: Tree Physiology
https://www.readbyqxmd.com/read/28073772/a-water-availability-gradient-reveals-the-deficit-level-required-to-affect-traits-in-potted-juvenile-eucalyptus-globulus
#13
Adam B McKiernan, Brad M Potts, Mark J Hovenden, Timothy J Brodribb, Noel W Davies, Thomas Rodemann, Scott A M McAdam, Julianne M O'Reilly-Wapstra
Background and aims: Drought leading to soil water deficit can have severe impacts on plants. Water deficit may lead to plant water stress and affect growth and chemical traits. Plant secondary metabolite (PSM) responses to water deficit vary between compounds and studies, with inconsistent reports of changes to PSM concentrations even within a single species. This disparity may result from experimental water deficit variation among studies, and so multiple water deficit treatments are used to fully assess PSM responses in a single species...
April 1, 2017: Annals of Botany
https://www.readbyqxmd.com/read/28064178/linking-photosynthesis-and-leaf-n-allocation-under-future-elevated-co2-and-climate-warming-in-eucalyptus-globulus
#14
Robert E Sharwood, Kristine Y Crous, Spencer M Whitney, David S Ellsworth, Oula Ghannoum
Leaf-level photosynthetic processes and their environmental dependencies are critical for estimating CO2 uptake from the atmosphere. These estimates use biochemical-based models of photosynthesis that require accurate Rubisco kinetics. We investigated the effects of canopy position, elevated atmospheric CO2 [eC; ambient CO2 (aC)+240 ppm] and elevated air temperature (eT; ambient temperature (aT)+3 °C) on Rubisco content and activity together with the relationship between leaf N and Vcmax (maximal Rubisco carboxylation rate) of 7 m tall, soil-grown Eucalyptus globulus trees...
February 1, 2017: Journal of Experimental Botany
https://www.readbyqxmd.com/read/28013374/mosquito-repellent-activity-of-volatile-oils-from-selected-aromatic-plants
#15
Lalthazuali, Nisha Mathew
Essential oils from fresh leaves of four aromatic plants viz., Ocimum sanctum, Mentha piperita, Eucalyptus globulus and Plectranthus amboinicus were extracted by hydrodistillation. The test solutions were prepared as 20% essential oil in ethanol and positive control as 20% DEET in ethanol. Essential oil blend was prepared as 5% concentration. Nulliparous, 3-5-day-old female adult Aedes aegypti mosquitoes were used for repellency screening as per ICMR protocol. The study showed that the repellency of 20% essential oil of O...
February 2017: Parasitology Research
https://www.readbyqxmd.com/read/27988649/the-australian-ciidae-coleoptera-tenebrionoidea-a-preliminary-revision
#16
John F Lawrence
The Australian ciid fauna is revised based on 75 described species (56 of them new) and three undescribed species, placed in 22 genera (nine of them new and nine newly recorded from Australia). The revision is considered preliminary, since about 50 other undescribed Australian species have been seen (usually as uniques or in short series), and it is likely that more will be found with increased intensive collecting. One additional New Caledonian species is also described, and one Cis species is considered to be based on a mislabelled Hawaiian specimen...
November 25, 2016: Zootaxa
https://www.readbyqxmd.com/read/27965057/visible-light-enhances-the-antimicrobial-effect-of-some-essential-oils
#17
María Soledad Marqués-Calvo, Francesc Codony, Gemma Agustí, Carlos Lahera
The photodisinfection is a topical, broad spectrum antimicrobial technology, targeting bacteria, virus, fungi, and protozoa effective for single cells as for biofilms. Natural molecules have been studied less than synthetic agents in the process but they are currently receiving great interest. Therefore, the aim of this study is to evaluate for the first time if non-coherent blue and red light enhances the antimicrobial activity of some essential oils when standard strains for antibiotic or fungicide tests are enlightened in vitro...
December 10, 2016: Photodiagnosis and Photodynamic Therapy
https://www.readbyqxmd.com/read/27905627/-pediculicide-effect-of-a-eucaliptus-globulus-l-formulation
#18
Marcia Avello, Pola Fernández, Marcos Fernández, Berta Schulz, Marta De Diego, Sigrid Mennickent, Pedro Novoa, Edgar Pastene
INTRODUCTION: Pediculosis capitis is a public health problem with a high prevalence. The emergence of parasite resistance to conventional pediculicide is of great concern worldwide. OBJECTIVE: To develop alternatives pediculicide, effective and safe, based on the essential oil of Eucaliptus globulus. METHOD: Through bioassays active concentrations ranges of the essential oil were established, and proceeded to develop a standardized, stable, pharmaceutical form, evaluating its effects on our population...
August 2016: Revista Chilena de Infectología: órgano Oficial de la Sociedad Chilena de Infectología
https://www.readbyqxmd.com/read/27889888/characteristics-of-ash-and-particle-emissions-during-bubbling-fluidised-bed-combustion-of-three-types-of-residual-forest-biomass
#19
João Peres Ribeiro, Estela Domingos Vicente, Célia Alves, Xavier Querol, Fulvio Amato, Luís A C Tarelho
Combustion of residual forest biomass (RFB) derived from eucalypt (Eucalyptus globulus), pine (Pinus pinaster) and golden wattle (Acacia longifolia) was evaluated in a pilot-scale bubbling fluidised bed reactor (BFBR). During the combustion experiments, monitoring of temperature, pressure and exhaust gas composition has been made. Ash samples were collected at several locations along the furnace and flue gas treatment devices (cyclone and bag filter) after each combustion experiment and were analysed for their unburnt carbon content and chemical composition...
November 26, 2016: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/27881800/genetic-stability-of-physiological-responses-to-defoliation-in-a-eucalypt-and-altered-chemical-defence-in-regrowth-foliage
#20
Christina L Borzak, Brad M Potts, Karen M Barry, Elizabeth A Pinkard, Julianne M O'Reilly-Wapstra
Defoliation may initiate physiological recovery and chemical defence mechanisms that allow a plant to improve fitness after damage. Such responses may result in changes in plant resource allocation that influence growth and foliar chemistry. In this study, we investigated the nature and stability of the defoliation response of juvenile plants from three divergent populations of Eucalyptus globulus Labill. A partial defoliation treatment that removed all upper crown leaves and the apical buds was applied to plants sourced from eight families from each of three populations representing contrasting chemical resistance to mammalian herbivory...
February 1, 2017: Tree Physiology
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