| eucalyptus essential oil toxicity against permethrin-resistant pediculus humanus capitis (phthiraptera: pediculidae). | during the past decades, chemical control against the head louse pediculus humanus capitis de geer has been based in the application of products containing permethrin. the repetitive overuse of pediculicides has resulted in the development of high levels of resistance to one or more of these products worldwide. essential oils obtained from aromatic plants like eucalyptus are good and safe alternatives due to their low toxicity to mammals and easy biodegradability. in the present study, we report ... | 2010 | 19902249 |
| insecticidal and repellency activity of essential oil of eucalyptus sp. against sitophilus zeamais motschulsky (coleoptera, curculionidae). | the objective of this work was to evaluate the insecticidal and repellent effect of essential oils of eucalyptus dunnii, e. saligna, e. benthamii, e. globulus and e. viminalis in the control of sitophilus zeamais in maize grains. | 2011 | 20945512 |
| ethanol production from eucalyptus plantation thinnings. | conditions for optimal pretreatment of eucalypt (eucalyptus dunnii) and spotted gum (corymbia citriodora) forestry thinning residues for bioethanol production were empirically determined using a 3(3) factorial design. up to 161mg/g xylose (93% theoretical) was achieved at moderate combined severity factors (csf) of 1.0-1.6. at csf>2.0, xylose levels declined, owing to degradation. moreover at high csf, depolymerisation of cellulose was evident and corresponded to glucose (155mg/g, ∼33% cellulose ... | 2012 | 22342086 |
| responses of eucalypt species to aluminum: the possible involvement of low molecular weight organic acids in the al tolerance mechanism. | aluminum (al) tolerance mechanisms in crop plants have been extensively researched, but our understanding of the physiological mechanisms underlying al tolerance in trees is still limited. to investigate al tolerance in eucalypts, seedlings of six species (eucalyptus globulus labill., eucalyptus urophylla s.t. blake, eucalyptus dunnii maiden, eucalyptus saligna sm., eucalyptus cloeziana f. j. muell. and eucalyptus grandis w. hill ex maiden) and seedlings of six clones of eucalyptus species were ... | 2004 | 15339736 |
| species richness and seasonal abundance of ectomycorrhizal fungi in plantations of eucalyptus dunnii and pinus taeda in southern brazil. | the abundance and diversity of ectomycorrhizal fungi (emf) was assessed based on the collection of basidiocarps during 12 months comprising the spring of 1995, and the summer, autumn, and winter of 1996, in three stands of young, middle-aged, and rotation age plantations of pinus taeda and eucalyptus dunnii, in the state of santa catarina, southern brazil. a total of 3,085 collections yielded 34 presumed emf taxa in ten genera, including mushroom-like and sequestrate species. fruiting patterns o ... | 2004 | 15007709 |
| automation of solid-phase microextraction-gas chromatography-mass spectrometry extraction of eucalyptus volatiles. | solid-phase microextraction (spme) coupled with gas chromatography (gc)-ion-trap mass spectrometry (itms) is employed to analyze fragrance compounds from different species of eucalyptus trees: eucalyptus dunnii, eucalyptus saligna, eucalyptus grandis, and hybrids of other species. the analyses are performed using an automated system for preincubation, extraction, injection, and analysis of samples. the autosampler used is a combipal and has much flexibility for the development of spme methods an ... | 2002 | 11954651 |
| sampling and monitoring of biogenic emissions by eucalyptus leaves using membrane extraction with sorbent interface (mesi). | membrane extraction with sorbent interface (mesi) has been applied to monitor plant fragrance volatiles emitted into indoor air. the main components of the mesi system are a membrane module and a trap, which can be connected directly to a gc or gc-ms for simultaneous multicomponent extraction and monitoring. a polydimethylsiloxane (pdms) membrane and two different traps, pdms and tenax, as well as a dc current supply for trap desorption have been applied in this research. after the membrane modu ... | 2002 | 12381104 |
| spme applied to the study of volatile organic compounds emitted by three species of eucalyptus in situ. solid-phase micro extraction. | headspace solid-phase microextraction coupled to gas chromatography/ion trap mass spectrometry-65 microm polydimethylsiloxane/divinylbenzene (pdms/dvb) was used to identify and monitor the emission patterns of biogenic volatile organic compounds from leaves of eucalyptus dunnii, eucalyptus saligna, and eucalyptus citriodora in situ. short extractions (1 min) were performed every 30 min for periods of 8-10 h during 24 days taking advantage of the high capacity of this porous polymer coating. fort ... | 2002 | 12452632 |
| on-site monitoring of biogenic emissions from eucalyptus dunnii leaves using membrane extraction with sorbent interface combined with a portable gas chromatograph system. | membrane extraction with sorbent interface, combined with a portable gas chromatograph system (mesi-portable gc) for continuous on-line monitoring of biogenic volatile organic compounds (bvocs) emissions (from leaves of eucalytus dunnii in a greenhouse), is presented herein. a sampling chamber was designed to facilitate the extraction and identification of the bvocs emitted by the eucalytus dunnii leaves. preliminary experiments, including; enrichment times, microtrap temperatures, stripping gas ... | 2004 | 14737584 |
| selection strategy for a seedling seed orchard design based on trait selection index and genomic analysis by molecular markers: a case study for eucalyptus dunnii. | molecular genetic analysis was applied to 162 individuals of 37 half-sib selected families belonging to six provenances of eucalyptus dunnii maiden in a provenance/family trial. the individuals were selected by a trait selection index and genetic diversity criteria were later applied for designing seedling seed orchards. genetic diversity and its distribution, as well as relationships among individuals, were assessed on the basis of nine microsatellite loci and 243 amplified fragment length poly ... | 2005 | 16105813 |
| utilization of rocks and ectomycorrhizal fungi to promote growth of eucalypt. | the utilization of rocks as fertilizers is limited by their low solubility. however, solubilization may be achieved by some micro-organisms, such as ectomycorrhizal fungi (ecmf). the aim of this study was to evaluate the potential of seven isolates of ecmf to solubilize two rocks, alkaline breccia and granite, and to liberate potassium and phosphorus for eucalyptus dunnii seedlings under greenhouse conditions. fungal inoculants were produced in a peat-vermiculite-liquid medium mixture and added ... | 2010 | 24031543 |
| comparative transcriptomic analysis of the response to cold acclimation in eucalyptus dunnii. | eucalyptus dunnii is an important macrophanerophyte with high economic value. however, low temperature stress limits its productivity and distribution. to study the cold response mechanisms of e. dunnii, 5 cdna libraries were constructed from mrna extracted from leaves exposed to cold stress for varying lengths of time and were evaluated by rna-seq analysis. the assembly of the illumina datasets was optimized using various assembly programs and parameters. the final optimized assembly generated ... | 2014 | 25412179 |
| structural and chemical characterization of hardwood from tree species with applications as bioenergy feedstocks. | eucalypt species are a group of flowering trees widely used in pulp production for paper manufacture. for several decades, the wood pulp industry has focused research and development efforts on improving yields, growth rates and pulp quality through breeding and the genetic improvement of key tree species. recently, this focus has shifted from the production of high quality pulps to the investigation of the use of eucalypts as feedstocks for biofuel production. here the structure and chemical co ... | 2012 | 23300786 |
| insecticidal activity of essential oils from eleven eucalyptus spp. and two hybrids: lethal and sublethal effects of their major components on blattella germanica. | the aim of the current study was to evaluate the fumigant activity of the essential oils from 11 species of the genus eucalyptus and two of their hybrids on first instar of blattella germanica l. the fumigant activity and repellence of the four major monoterpene components of these essential oils also were tested. fumigant activity was evaluated by exposing nymphs to the vapors emitted by 50 microl of essential oil or monoterpene in a closed container. the lowest knockdown time 50% (kt50) values ... | 2011 | 21510210 |
| selection of a seed orchard of eucalyptus dunnii based on genetic diversity criteria calculated using molecular markers. | a eucalyptus dunnii maiden breeding population of 46 accessions originated in australia and selected for fitness to subtropical and cold environments was screened by amplified fragment length polymorphism (aflp) and microsatellite markers to obtain quantitative estimates of genetic diversity. a randomly chosen group of aflp primers generated 205 aflp bands that were used to fingerprint the genotypes and to evaluate genetic relationships among accessions. sixty-eight percent (140) of the bands we ... | 2003 | 12750055 |
| correlations between pulp properties of eucalyptus clones and leaf volatiles using automated solid-phase microextraction. | analysis of biogenic volatile organic compounds (bvoc) of 14 eucalyptus clones has been performed using an automated headspace solid-phase microextraction (hs-spme) coupled to gas chromatography (gc)/ion trap mass spectrometry (itms) method. correlations between pulp properties of eucalyptus clones and the bvoc of their leaf headspaces were studied. the compounds alpha-terpineol and the sesquiterpene beta-eudesmol were positively correlated with s5, a property related to the hemicelluose content ... | 2003 | 14690363 |
| two new phytophthora species from south african eucalyptus plantations. | a recent study to determine the cause of collar and root rot disease outbreaks of cold tolerant eucalyptus species in south africa resulted in the isolation of two putative new phytophthora species. based on phylogenetic comparisons using the its and beta-tubulin gene regions, these species were shown to be distinct from known species. these differences were also supported by robust morphological characteristics. the names, phytophthora frigida sp. nov. and phytophthora alticola sp. nov. are thu ... | 2007 | 18032009 |
| comparative study of eucalyptus dunnii volatile oil composition using retention indices and comprehensive two-dimensional gas chromatography coupled to time-of-flight and quadrupole mass spectrometry. | in the present work, the composition of volatile oil from leaves of eucalyptus dunnii was studied using comprehensive two-dimensional gas chromatography (gcxgc) techniques. structurally related compounds were found to elute mainly in specific regions of the two-dimensional space, showing orderly distribution with chemical class. mass spectra of essential oil components were obtained from two different mass spectrometry detection methods: quadrupole (qms) and time-of-flight (tofms), using the sam ... | 2008 | 18541252 |