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| Author | Nirma, C.; Rodrigues, A.M.S.; Basset, C.; Chevolot, L.; Girod, R.; Moretti, C.; Stien, D.; Dusfour, I.; Eparvier, V. | ||||
| Title | Larvicidal activity of isoflavonoids from Muellera frutescens extracts against Aedes aegypti | Type | Journal Article | ||
| Year | 2012 | Publication | Natural Product Communications | Abbreviated Journal | |
| Volume | 7 | Issue | 10 | Pages | 1319-1322 |
| Keywords | Aedes aegypti; French Guiana; Insecticides; Isoflavonoids; Muellera frutescens | ||||
Abstract  |
The biological activity of extracts from the leaves, bark and roots of Muellera frutescens, an Amazonian ichtyotoxic plant, were evaluated to find new environmentally safe insecticides. The n-hexane extracts of bark, leaf, and root showed a strong toxic activity against Aedes aegypti mosquito larvae. Bioguided fractionation of the bark extract led to the isolation of seven isoflavonoids (12a-hydroxyelliptone, elliptone, (-)-variabilin, rotenone, rotenolone, tephrosin and deguelin). Rotenone and deguelin are responsible for the larvicidal activity of the plant. M. frutescens leaves contain up to 0.6%, w/w, deguelin. These results justify the traditional ichtyotoxic use of M. frutescens. The leaves contain a relatively high proportion of deguelin and, therefore, can be considered as a renewable source of this environmentally friendly insecticidal isoflavonoid. | ||||
| Address | CNRS, Institut de Chimie des Substances Naturelles, UPR 2301, 1 avenue de la Terrasse, 91198 Gif-sur-Yvette, France | ||||
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| Notes | Export Date: 6 December 2012; Source: Scopus | Approved | no | ||
| Call Number | EcoFoG @ webmaster @ | Serial | 448 | ||
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| Author | Tremolieres, M.; Noel, V.; Herault, B. | ||||
| Title | Phosphorus and nitrogen allocation in Allium ursinum on an alluvial floodplain (Eastern France). Is there an effect of flooding history? | Type | Journal Article | ||
| Year | 2009 | Publication | Plant and Soil | Abbreviated Journal | Plant Soil |
| Volume | 324 | Issue | 1-2 | Pages | 279-289 |
| Keywords | Allium ursinum; Flooding history; Nitrogen; Nutrient bioavailability; Phosphorus; Rhine | ||||
| Abstract |
The change in phosphorus and nitrogen content in a common geophyte spring species, Allium ursinum, is studied in alluvial forests in relation to three flooding histories related to river regulation: (1) annually flooded, (2) unflooded for 30 years, and (3) unflooded for 200 years. Flood suppression leads to a reduction of available P soil content as well as decreasing the biomass and the amount of phosphorus in plants, but has no significant effect on N plant content. Plant N:P ratio increases with the suppression of floods and is primarily driven by soil N:P ratios, in turn markedly linked to the total nitrogen in the soil. We highlighted a lower nutrient accumulation in leaves during plant growth in unflooded forests. Overall, our results suggest that P was the main limiting factor in unflooded forests while nitrogen was the main limiting factor in annually flooded forests. Flood suppression strongly affects the morphology and nutrient uptake by Allium ursinum and thus nutrient cycling in riverine forests. | ||||
| Address | [Tremolieres, Michele; Noel, Valerie] Inst Bot, LHYGES, UMR 7517, F-67083 Strasbourg, France, Email: michele.tremolieres@bota-ulp.u-strasbg.fr | ||||
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| Publisher | SPRINGER | Place of Publication | Editor | ||
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| ISSN | 0032-079X | ISBN | Medium | ||
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| Notes | ISI:000271028800020 | Approved | no | ||
| Call Number | EcoFoG @ eric.marcon @ | Serial | 99 | ||
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| Author | Boisse, P.; Aimene, Y.; Dogui, A.; Dridi, S.; Gatouillat, S.; Hamila, N.; Khan, M.A.; Mabrouki, T.; Morestin, F.; Vidal-Sallé, E. | ||||
| Title | Hypoelastic, hyperelastic, discrete and semi-discrete approaches for textile composite reinforcement forming | Type | Journal Article | ||
| Year | 2010 | Publication | International Journal of Material Forming | Abbreviated Journal | |
| Volume | 3 | Issue | Supplement 2 | Pages | 1229-1240 |
| Keywords | Textile composites Forming simulations Continuous/discrete approaches Hyperelasticity Hypoelasticity Semi-discrete finite element | ||||
| Abstract |
The clear multi-scale structure of composite textile reinforcements leads to develop continuous and discrete approaches for their forming simulations. In this paper two continuous modelling respectively based on a hypoelastic and hyperelastic constitutive model are presented. A discrete approach is also considered in which each yarn is modelled by shell finite elements and where the contact with friction and possible sliding between the yarns are taken into account. Finally the semi-discrete approach is presented in which the shell finite element interpolation involves continuity of the displacement field but where the internal virtual work is obtained as the sum of tension, in-plane shear and bending ones of all the woven unit cells within the element. The advantages and drawbacks of the different approaches are discussed. | ||||
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| Notes | Hypoelastic, hyperelastic, discrete and semi-discrete approaches for textile composite reinforcement forming | Approved | no | ||
| Call Number | EcoFoG @ eric.marcon @ 8 | Serial | 90 | ||
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| Author | Staudt, K.; Serafimovich, A.; Siebicke, L.; Pyles, R.D.; Falge, E. | ||||
| Title | Vertical structure of evapotranspiration at a forest site (a case study) | Type | Journal Article | ||
| Year | 2011 | Publication | Agricultural and Forest Meteorology | Abbreviated Journal | Agric. For. Meterol. |
| Volume | 151 | Issue | 6 | Pages | 709-729 |
| Keywords | Eddy-covariance; Evapotranspiration; In-canopy profiles; Model; Picea abies L.; Sap flux; coniferous forest; ecosystem modeling; eddy covariance; evapotranspiration; forest canopy; sap flow; Fichtelgebirge; Germany; Picea abies | ||||
| Abstract |
The components of ecosystem evapotranspiration of a Norway spruce forest (Picea abies L.) as well as the vertical structure of canopy evapotranspiration were analyzed with a combination of measurements and models for a case study of 5 days in September 2007. Eddy-covariance and sap flux measurements were performed at several heights within the canopy at the FLUXNET site Waldstein-Weidenbrunnen (DE-Bay) in the Fichtelgebirge mountains in Germany. Within and above canopy fluxes were simulated with two stand-scale models, the 1D multilayer model ACASA that includes a third-order turbulence closure and the 3D model STANDFLUX. The soil and understory evapotranspiration captured with the eddy-covariance system in the trunk space constituted 10% of ecosystem evapotranspiration measured with the eddy-covariance system above the canopy. A comparison of transpiration measured with the sap flux technique and inferred from below and above canopy eddy-covariance systems revealed higher estimates from eddy-covariance measurements than for sap flux measurements. The relative influences of possible sources of this mismatch, such as the assumption of negligible contribution of evaporation from intercepted water, and differences between the eddy-covariance flux footprint and the area used for scaling sap flux measurements, were discussed. Ecosystem evapotranspiration as well as canopy transpiration simulated with the two models captured the dynamics of the measurements well, but slightly underestimated eddy-covariance values. Profile measurements and models also gave us the chance to assess in-canopy profiles of canopy evapotranspiration and the contributions of in-canopy layers. For daytime and a coupled or partly coupled canopy, mean simulated profiles of both models agreed well with eddy-covariance measurements, with a similar performance of the ACASA and the STANDFLUX model. Both models underestimated profiles for nighttime and decoupled conditions. During daytime, the upper half of the canopy contributed approximately 80% to canopy evapotranspiration, whereas during nighttime the contribution shifted to lower parts of the canopy. © 2010 Elsevier B.V. | ||||
| Address | Max Planck Institute for Chemistry, Biogeochemistry Department, Joh.-J.-Becherweg 27, 55128 Mainz, Germany | ||||
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| ISSN | 01681923 (Issn) | ISBN | Medium | ||
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| Notes | Cited By (since 1996): 3; Export Date: 21 October 2011; Source: Scopus; Coden: Afmee; doi: 10.1016/j.agrformet.2010.10.009; Language of Original Document: English; Correspondence Address: Staudt, K.; University of Bayreuth, Department of Micrometeorology, 95440 Bayreuth, Germany; email: katharina.staudt@uni-bayreuth.de | Approved | no | ||
| Call Number | EcoFoG @ webmaster @ | Serial | 349 | ||
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| Author | Fortunel, C.; Paine, C.E.T.; Fine, P.V.A.; Kraft, N.J.B.; Baraloto, C. | ||||
| Title | Environmental factors predict community functional composition in Amazonian forests | Type | Journal Article | ||
| Year | 2014 | Publication | Journal of Ecology | Abbreviated Journal | J. Ecol. |
| Volume | 102 | Issue | 1 | Pages | 145-155 |
| Keywords | Amazonian landscape; Climatic and soil gradients; Determinants of plant community diversity and structure; Environmental filtering; Functional traits; Tree communities; Tropical forests | ||||
| Abstract |
The consequences of biodiversity loss for ecosystem services largely depend on the functional identities of extirpated species. However, poor descriptions of spatial patterns of community functional composition across landscapes hamper accurate predictions, particularly in highly diverse tropical regions. Therefore, understanding how community functional composition varies across environmental gradients remains an important challenge. We sampled 15 functional traits in 800 Neotropical tree species across 13 forest plots representative of the broad climatic and soil gradients encompassed by three widespread lowland forest habitats (terra firme forests on clay-rich soils, seasonally flooded forests and white-sand forests) at opposite ends of Amazonia (Peru and French Guiana). We combined univariate and multivariate approaches to test the magnitude and predictability of environmental filtering on community leaf and wood functional composition. Directional shifts in community functional composition correlated with environmental changes across the 13 plots, with denser leaves, stems and roots in forests occurring in environments with limited water and soil-nutrient availability. Critically, these relationships allowed us to accurately predict the functional composition of 61 additional forest plots from environmental data alone. Synthesis. Environmental filtering consistently shapes the functional composition of highly diverse tropical forests at large scales across the terra firme, seasonally flooded and white-sand forests of lowland Amazonia. Environmental factors drive and allow the prediction of variation in community functional composition among habitat types in Amazonian forests. © 2013 British Ecological Society. | ||||
| Address | Department of Biology, University of Florida, Gainesville, FL, 32611, United States | ||||
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| ISSN | 00220477 (Issn) | ISBN | Medium | ||
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| Call Number | EcoFoG @ webmaster @ | Serial | 520 | ||
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| Author | Mayer, V.E.; Lauth, J.; Orivel, J. | ||||
| Title | Convergent structure and function of mycelial galleries in two unrelated Neotropical plant-ants | Type | Journal Article | ||
| Year | 2017 | Publication | Insectes Sociaux | Abbreviated Journal | |
| Volume | 64 | Issue | 3 | Pages | 365-371 |
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| Abstract |
The construction process and use of galleries by Azteca brevis (Myrmicinae: Dolichoderinae) inhabiting Tetrathylacium macrophyllum (Salicaceae) were compared with Allomerus decemarticulatus (Myrmicinae: Solenopsidini) galleries on Hirtella physophora (Chrysobalanaceae). Though the two ant species are phylogenetically distant, the gallery structure seems to be surprisingly similar and structurally convergent: both are pierced with numerous holes and both ant species use Chaetothyrialean fungi to strengthen the gallery walls. Al. decemarticulatus is known to use the galleries for prey capture and whether this is also the case for Az. brevis was tested in field experiments. We placed Atta workers as potential prey/threat on the galleries and recorded the behaviour of both ant species. We found considerable behavioural differences between them: Al. decemarticulatus was quicker and more efficient at capture than was Az. brevis. While most Atta workers were captured after the first 5 min by Al. decemarticulatus, significantly fewer were captured by Az. brevis even after 20 min. Moreover, the captured Atta were sometimes simply discarded and not taken to the nest by Az. brevis. As a consequence, the major function of the galleries built by Az. brevis may, therefore, be defense against intruders in contrast to Al. decemarticulatus which uses them mainly for prey capture. This may be due to a higher need for protein in Al. decemarticulatus compared to coccid-raising Az. brevis. | ||||
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| Series Volume | Series Issue | Edition | |||
| ISSN | 1420-9098 | ISBN | Medium | ||
| Area | Expedition | Conference | |||
| Notes | Approved | no | |||
| Call Number | EcoFoG @ webmaster @ Mayer2017 | Serial | 784 | ||
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| Author | Lehours, A.-C.; Jeune, A.-H.L.; Aguer, J.-P.; Céréghino, R.; Corbara, B.; Kéraval, B.; Leroy, C.; Perrière, F.; Jeanthon, C.; Carrias, J.-F. | ||||
| Title | Unexpectedly high bacteriochlorophyll a concentrations in neotropical tank bromeliads | Type | Journal Article | ||
| Year | 2016 | Publication | Environmental Microbiology Reports | Abbreviated Journal | Environmental Microbiology Reports |
| Volume | 8 | Issue | 5 | Pages | 689-698 |
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| Abstract |
The contribution of bacteriochlorophyll a (BChl a) to photosynthetically driven electron transport is generally low in aquatic and terrestrial systems. Here, we provide evidence that anoxygenic bacterial phototrophy is widespread and substantial in water retained by tank bromeliads of a primary rainforest in French Guiana. An analysis of the water extracted from 104 randomly selected tank bromeliads using infrared fluorimetry suggested the overall presence of abundant anoxygenic phototrophic bacterial populations. We found that purple bacteria dominated these populations responsible for unusually high BChl a/chlorophyll a ratios (>50%). Our data suggest that BChl a-based phototrophy in tank bromeliads can have significant effects on the ecology of tank-bromeliad ecosystems and on the carbon and energy fluxes in Neotropical forests. | ||||
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| Language | Summary Language | Original Title | |||
| Series Editor | Series Title | Abbreviated Series Title | |||
| Series Volume | Series Issue | Edition | |||
| ISSN | 1758-2229 | ISBN | Medium | ||
| Area | Expedition | Conference | |||
| Notes | Approved | no | |||
| Call Number | EcoFoG @ webmaster @ | Serial | 709 | ||
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| Author | Lebrini, M.; Robert, F.; Roos, C. | ||||
| Title | Adsorption properties and inhibition of C38 steel corrosion in hydrochloric solution by some indole derivates: Temperature effect, activation energies, and thermodynamics of adsorption | Type | Journal Article | ||
| Year | 2013 | Publication | International Journal of Corrosion | Abbreviated Journal | Int. J. Corros. |
| Volume | 2013 | Issue | Article ID 139798 | Pages | 13 |
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| Abstract |
The corrosion rates in the presence of some indole derivates, namely, 9H-pyrido[3,4-b]indole (norharmane) and 1-methyl-9H-pyrido[3,4-b]indole (harmane), as inhibitors of C38 steel corrosion inhibitor in 1 M HCl solution, were measured by potentiodynamic polarization and electrochemical impedance spectroscopy (EIS) techniques, in the range of temperatures from 25 to 55 °C. Results obtained revealed that the organic compounds investigated have inhibiting properties for all temperatures. The inhibition was assumed to occur via adsorption of the indole molecules on the metal surface. Adsorption of indole derivates was found to follow the Langmuir isotherm. The apparent activation energies, enthalpies, and entropies of the dissolution process and the free energies and enthalpies for the adsorption process were determined by potentiodynamic polarization and electrochemical impedance. The fundamental thermodynamic functions were used to collect important information about indole inhibitory behaviour. © 2013 M. Lebrini et al. | ||||
| Address | Laboratoire Matériaux et Molécules en Milieu Amazonien, UAG-UMR ECOFOG, Campus Trou Biran, 97337 Cayenne, French Guiana | ||||
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| Notes | Export Date: 4 July 2013; Source: Scopus; Art. No.: 139798 | Approved | no | ||
| Call Number | EcoFoG @ webmaster @ | Serial | 495 | ||
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| Author | Sayer, E.J.; Rodtassana, C.; Sheldrake, M.; Bréchet, L.M.; Ashford, O.S.; Lopez-Sangil, L.; Kerdraon-Byrne, D.; Castro, B.; Turner, B.L.; Wright, S.J.; Tanner, E.V.J. | ||||
| Title | Revisiting nutrient cycling by litterfall—Insights from 15 years of litter manipulation in old-growth lowland tropical forest | Type | Journal Article | ||
| Year | 2020 | Publication | Advances in Ecological Researc | Abbreviated Journal | Adv. Ecol. Res. |
| Volume | 62 | Issue | Pages | 173-223 | |
| Keywords | Forest floor; Litter addition; Litter removal; Litterfall; Nutrient cycling; Nutrient use efficiency; Soil fertility; Trace elements; Tropical lowland forest | ||||
| Abstract |
The crucial role of tropical forests in the global carbon balance is underpinned by their extraordinarily high biomass and productivity, even though the majority of tropical forests grow on nutrient-poor soils. Nutrient cycling by litterfall has long been considered essential for maintaining high primary productivity in lowland tropical forests but few studies have tested this assumption experimentally. We review and synthesise findings from the Gigante Litter Manipulation Project (GLiMP), a long-term experiment in lowland tropical forest in Panama, Central America, in which litter has been removed from or added to large-scale plots for 15 years. We assessed changes in soil and litter nutrient concentrations in response to the experimental treatments and estimated nutrient return and nutrient use efficiency to indicate changes in nutrient cycling. The soil concentrations of most nutrients increased with litter addition and declined with litter removal. Litter removal altered nitrogen, potassium, manganese and zinc cycling, demonstrating the importance of litter inputs for maintaining the availability of these elements to plants. By contrast, litter addition only altered nitrogen cycling and, despite low concentrations of available soil phosphorus, the effects of litter manipulation on phosphorus cycling were inconsistent. We discuss potential mechanisms underlying the observed changes, and we emphasise the importance of decomposition processes in the forest floor for retaining nutrient elements, which partially decouples nutrient cycling from the mineral soil. Finally, by synthesising GLiMP studies conducted during 15 years of litter manipulation, we highlight key knowledge gaps and avenues for future research into tropical forest nutrient cycling. © 2020 Elsevier Ltd | ||||
| Address | Teagasc, Johnstown Castle, Wexford, Ireland | ||||
| Corporate Author | Thesis | ||||
| Publisher | Academic Press Inc. | Place of Publication | Editor | Dumbrell A.J.; Turner E.C.; Fayle T.M. | |
| Language | Summary Language | Original Title | |||
| Series Editor | Series Title | Abbreviated Series Title | Advances in Ecological Research | ||
| Series Volume | 62 | Series Issue | Edition | ||
| ISSN | 00652504 (Issn); 9780128211342 (Isbn) | ISBN | Medium | ||
| Area | Expedition | Conference | |||
| Notes | Approved | no | |||
| Call Number | EcoFoG @ webmaster @ | Serial | 1001 | ||
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| Author | Marchal, R.; Mothe, F.; Denaud, L.E.; Thibaut, B.; Bleron, L. | ||||
| Title | Cutting forces in wood machining – Basics and applications in industrial processes. A review COST Action E35 2004-2008: Wood machining – micromechanics and fracture | Type | Journal Article | ||
| Year | 2009 | Publication | Holzforschung | Abbreviated Journal | Holzforschung |
| Volume | 63 | Issue | 2 | Pages | 157-167 |
| Keywords | cutting forces; online control; peeling process; physico-mechanical model; sound; vibrations; wood industry; wood machining | ||||
| Abstract |
The data available in the literature concerning wood cutting forces permits to build models or to simulate the main wood machining processes ( milling, sawing, peeling, etc.). This approach contributes to a better understanding of formation of wood surfaces and chips and the data may be helpful to optimise cutting geometry, reduce tool wear, improve tool material, and to size tool-machines. The models may also be useful for industrial application in two ways: ( 1) providing data to optimise the settings for a given operation ( batch approach), and ( 2) building predictive models that could be the basis of an online control system for the machining processes ( interactive approach). A prerequisite for this is that numerous machining tests on different wood materials are performed based on experiences with different kind of tools and experimental devices. With a focus on potential industrial applications, the emphasis of this review was on the wood peeling process, which is a very demanding special case of wood cutting. Although not so many industrial machines are equipped with expensive force sensors, there is a lot of high quality information available about cutting forces which may be useful to improve the scientific or technological knowledge in wood machining. Alternative parameters, such as vibration or sound measurements, appear to be promising substitutes in the praxis, particularly to feed online control systems of any wood cutting process. | ||||
| Address | [Marchal, Remy; Bleron, Laurent] Arts & Metiers ParisTech, LABOMAP, F-71250 Cluny, France, Email: remy.marchal@cluny.ensam.fr | ||||
| Corporate Author | Thesis | ||||
| Publisher | WALTER DE GRUYTER & CO | Place of Publication | Editor | ||
| Language | Summary Language | Original Title | |||
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| Series Volume | Series Issue | Edition | |||
| ISSN | 0018-3830 | ISBN | Medium | ||
| Area | Expedition | Conference | |||
| Notes | ISI:000263932200006 | Approved | no | ||
| Call Number | EcoFoG @ eric.marcon @ | Serial | 205 | ||
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