| Records |
| Author |
Bardet, S.; Beauchene, J.; Thibaut, B. |
| Title |
Influence of basic density and temperature on mechanical properties perpendicular to grain of ten wood tropical species |
Type |
Journal Article |
| Year |
2003 |
Publication |
Annals of Forest Science |
Abbreviated Journal |
Ann. For. Sci. |
| Volume |
60 |
Issue |
1 |
Pages |
49-59 |
| Keywords |
green wood; tropical wood; transverse mechanical properties; basic density; softening temperature |
| Abstract |
The influence of temperature on transverse mechanical properties of 10 tropical species in green condition was studied in radial compression (0 to 99 degreesC), transverse shear with longitudinal-radial shearing plane and rupture of the longitudinal-tangential plane (20 to 80 degreesC). Basic density ranged from 0.21 to 0.91 g cm(-3). Load-displacement curves were characterised by initial rigidity, yield stress, yield strain and strain energy at 20% strain level. The relation between each criterion and basic density was expressed by a power law. The dependency on temperature evidenced a sharp glassy transition, except for the fracture energy only slightly influenced by temperature. An empirical model allowed evaluating a transition temperature between 51 and 69 degreesC, depending on the species and the criterion, which was attributed to lignin. Detailed analysis of the apparent modulus in radial compression suggested that complex relaxation phenomena occur around 10 degreesC and that the rubbery state is not fully reached at 80 degreesC. |
| Address |
Univ Montpellier 2, Lab Mecan & Genie Civil, Equipe Bois, F-34095 Montpellier 5, France |
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Thesis |
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| Publisher |
E D P SCIENCES |
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Edition |
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| ISSN |
1286-4560 |
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| Notes |
ISI:000181322100006 |
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no |
| Call Number |
EcoFoG @ eric.marcon @ |
Serial  |
275 |
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| Author |
Konig, A.O.; Ziegenhagen, B.; van Dam, B.C.; Csaikl, U.M.; Coart, E.; Degen, B.; Burg, K.; de Vries, S.M.G.; Petit, R.J. |
| Title |
Chloroplast DNA variation of oaks in western Central Europe and genetic consequences of human influences |
Type |
Journal Article |
| Year |
2002 |
Publication |
Forest Ecology and Management |
Abbreviated Journal |
For. Ecol. Manage. |
| Volume |
156 |
Issue |
1-3 |
Pages |
147-166 |
| Keywords |
Q. robur; Q. petraea; PCR-RFLPs; haplotypes; spatial genetic patterns; genetic differentiation; deforestation; seed transfer |
| Abstract |
Oak chloroplast DNA (cpDNA) variation was studied in a grid-based inventory in western Central Europe, including Belgium, The Netherlands, Luxembourg, Germany, the Czech Republic, and the northern parts of Upper and Lower Austria. A total of 2155 trees representing 426 populations of Quercus robur L. and Q. petraea (Matt.) Liebl. were screened for polymorphism in up to four PCR-amplified cpDNA fragments. Eleven haplotypes belonging to four lineages were detected; these lineages were formerly restricted to glacial refugia in the Iberian Peninsula, the Apennine Peninsula and the Balkan Peninsula. The haplotypes originating from the Apennines are particularly well represented in the study region, but there is also a significant contribution from the other refugia, which explain the high overall level of cpDNA diversity. The strong human impact in western Central Europe during the past centuries, which has resulted in the clearance of most forests, was followed by reforestation, sometimes involving seed transfers. Despite this strong human impact, broad geographic patterns of lineages and haplotypes could still be detected. To evaluate further the consequences of the former human activities on the present day oak cpDNA genetic structure, four regions where increasingly strong human impact was anticipated (ranging from hilly regions in southern Germany to roadsides plantations in The Netherlands) were selected. There, a comparison of the levels of intrapopulation cpDNA diversity and spatial structuring was made. Over the whole area, within stand diversity was significantly higher in Q. robur than in Q. petraea (h(S) = 0.24 vs. 0.16). Since total diversity is identical for both species, this results in a significantly lower level of fixation for Q. robur than for Q. petraea (G(ST) = 0.68 vs. 0.79). The analyses also reveal a decrease of fixation with increasing human impact on oak populations. The Dutch roadside plantations (Q. robur) exhibit a very low level of fixation (G(ST) = 0.28) as compared to Q. petraea in southern Germany (G(ST) = 0.91). The significance of the spatial genetic structure was tested using geostatistical methods. For the complete data set, a strong spatial genetic structure is confirmed, with higher than average genetic similarities between populations distant from up to 270 km, whereas there is no spatial structure in the roadside plantations in The Netherlands or in the northern German lowlands. These results should help to differentiate introduced from autochthonous populations, and provide a framework for the identification of the geographic origin of seed lots. (C) 2002 Elsevier Science B.V. All rights reserved. |
| Address |
Inst FOrstgenet & Forstpflanzenzuchtung, BFH, D-22927 Grosshansdorf, Germany |
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| Publisher |
ELSEVIER SCIENCE BV |
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Series Issue |
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Edition |
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| ISSN |
0378-1127 |
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| Notes |
ISI:000174149400010 |
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no |
| Call Number |
EcoFoG @ eric.marcon @ |
Serial |
276 |
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| Author |
Vedel, V.; Apostolou, Z.; Arthur, W.; Akam, M.; Brena, C. |
| Title |
An early temperature-sensitive period for the plasticity of segment number in the centipede Strigamia maritima |
Type |
Journal Article |
| Year |
2010 |
Publication |
Evolution & Development |
Abbreviated Journal |
Evol Dev |
| Volume |
12 |
Issue |
4 |
Pages |
347-352 |
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Series Issue |
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Edition |
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| ISSN |
1520-541X |
ISBN |
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Expedition |
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Conference |
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| Notes |
WOS:000279440800002 |
Approved |
no |
| Call Number |
EcoFoG @ eric.marcon @ |
Serial |
278 |
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| Author |
Guerrero, R.J.; Delabie, J.H.C.; Dejean, A. |
| Title |
Taxonomic Contribution to the aurita Group of the Ant Genus Azteca (Formicidae: Dolichoderinae) |
Type |
Journal Article |
| Year |
2010 |
Publication |
Journal of Hymenoptera Research |
Abbreviated Journal |
J. Hymenopt. Res. |
| Volume |
19 |
Issue |
1 |
Pages |
51-65 |
| Keywords |
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| Abstract |
We describe five new species in the aurita group of the genus Azteca: Azteca andreae sp. n. (French Guiana), Azteca diabolica sp. n. (Panama), Azteca laurae sp. n. (Brazil), Azteca linamariae sp. n. (Brazil and Colombia) and Azteca snellingi sp. n. (Panama). Four of these new species are based on gynes, while the last is based only on the worker caste. All of them bear the aurita group characteristics. The second taxon is remarkable, as it differs from all of the other members of the group in the exaggerated, horn-like extensions of the posterolateral vertex margins. Azteca snellingi sp. n. is named in honor of our colleague, Roy Snelling, in tribute to his life-long contribution to knowledge of the world of Hymenoptera. A key to all known species of the aurita group, based on gynes, is provided. We report also for the first time an intercast case for the genus Azteca, based on an Azteca schimperi specimen. |
| Address |
[Guerrero, Roberto J.] Univ Magdalena, INTROPIC, Grp Invest Insectos Neotrop, Santa Marta, Magdalena, Colombia, Email: robertojoseguerreroflorez@gmail.com |
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Thesis |
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| Publisher |
INT SOC HYMENOPTERISTS |
Place of Publication |
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Series Issue |
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Edition |
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| ISSN |
1070-9428 |
ISBN |
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Medium |
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Expedition |
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Conference |
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| Notes |
ISI:000285775800005 |
Approved |
no |
| Call Number |
EcoFoG @ eric.marcon @ |
Serial |
279 |
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| Author |
Gond, V.; Guitet, S. |
| Title |
Remote Sensing in Post-Logging Diagnoses for Forest Management in French Guiana |
Type |
Journal Article |
| Year |
2009 |
Publication |
Bois et Forets des Tropiques |
Abbreviated Journal |
Bois For. Trop. |
| Volume |
63 |
Issue |
299 |
Pages |
5-13 |
| Keywords |
selective logging; logging impact inspections; French Guiana; remote sensing; forest management |
| Abstract |
This study is part of the activities carried out to monitor tow-impact logging operations in humid tropical forests. The sustainability of these activities is highly dependent on the scale of logging damage, and managers therefore need to carry out effective checks on the quality of forestry work. In this study, remote sensing was used to track the extension of logging operations and to assess damage, through images acquired during and after logging in each parcel. Analysis of the high-resolution images (10 m) clearly identifies logged-over clearings and some skidding tracks, allowing assessments of gaps opening up in the canopy. Several parcels were monitored in this French Guiana study. A simple diagnostic procedure was established for each parcel to assess logging intensity and identify new logging tracks and timber losses. The remote sensing toot thus helps to make more accurate assessments of logging quality and to draw relevant conclusions for the logging company. The study has demonstrated the usefulness of remote sensing to identify damage after logging. The quality of restitution of the damage was validated by means of a database on the logging terrain and through field missions. This post-logging inspection tool can now be automated for fully operational use by forest managers. |
| Address |
[Gond, Valery] Univ Laval, Fac Foresterie, Umr Ecofog Guyane francaise, Cirad,UR 36, Quebec City, PQ G1V OA6, Canada |
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| Publisher |
CIRAD-CENTRE COOPERATION INT RECHERCHE AGRONOMIQUE POUR |
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Edition |
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| ISSN |
0006-579X |
ISBN |
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Conference |
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| Notes |
ISI:000266156700001 |
Approved |
no |
| Call Number |
EcoFoG @ webmaster @ |
Serial |
280 |
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| Author |
Cochard, H.; Coste, S.; Chanson, B.; Guehl, J.M.; Nicolini, E. |
| Title |
Hydraulic architecture correlates with bud organogenesis and primary shoot growth in beech (Fagus sylvatica) |
Type |
Journal Article |
| Year |
2005 |
Publication |
Tree Physiology |
Abbreviated Journal |
Tree Physiol. |
| Volume |
25 |
Issue |
12 |
Pages |
1545-1552 |
| Keywords |
development; hydraulic conductance; leaf primordia; meristem; xylem |
| Abstract |
In beech (Fagus sylvatica L.), the number of leaf primordia preformed in the buds determines the length and the type (long versus short) of annual growth units, and thus, branch growth and architecture. We analyzed the correlation between the number of leaf primordia and the hydraulic conductance of the vascular system connected to the buds. Terminal buds of short growth units and axillary buds of long growth units on lower branches of mature trees were examined. Buds with less than four and more than five leaf primordia formed short and long growth units, respectively. Irrespective of the type of growth unit the bud was formed on, the occurrence of a large number of leaf primordia was associated with high xylem hydraulic conductance. Xylem conductance was correlated to the area of the outermost annual ring. These results suggest that organogenesis and primary growth in buds correlates with secondary growth of the growth units and thus with their hydraulic architecture. Possible causal relationships between the variables are discussed. |
| Address |
INRA UBP, UMR PIAF, F-63039 Clermont Ferrand, France, Email: cochard@clermont.inra.fr |
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| Publisher |
HERON PUBLISHING |
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Edition |
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| ISSN |
0829-318X |
ISBN |
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Conference |
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| Notes |
ISI:000234019900008 |
Approved |
no |
| Call Number |
EcoFoG @ webmaster @ |
Serial |
281 |
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| Author |
Marti, G.; Eparvier, V.; Litaudon, M.; Grellier, P.; Gueritte, F. |
| Title |
A New Xanthone from the Bark Extract of Rheedia acuminata and Antiplasmodial Activity of Its Major Compounds |
Type |
Journal Article |
| Year |
2010 |
Publication |
Molecules |
Abbreviated Journal |
Molecules |
| Volume |
15 |
Issue |
10 |
Pages |
7106-7114 |
| Keywords |
Rheedia acuminata, Clusiaceae; xanthones; antiplasmodial activity; cytotoxicity |
| Abstract |
Bioassay-guided fractionation of the ethyl acetate bark extract of Rheedia acuminata led to the isolation of the new compound 1,5,6-trihydroxy-3-methoxy-7-geranyl-xanthone (1), together with four known compounds 2-5. These compounds were tested in vitro for their antiplasmodial activity on a chloroquine-resistant strain of Plasmodium falciparum (FcB1) and for their cytotoxicity against the human diploid embryonic lung cell line MRC-5. |
| Address |
[Eparvier, Veronique] CNRS, UPS2561, F-97300 Cayenne, France, Email: guillaume.marti@icsn.cnrs-gif.fr |
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| Publisher |
MDPI AG |
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Series Issue |
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Edition |
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| ISSN |
1420-3049 |
ISBN |
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| Notes |
ISI:000283587400030 |
Approved |
no |
| Call Number |
EcoFoG @ webmaster @ |
Serial |
282 |
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| Author |
Millet, J.; Pascal, J.P.; Kiet, L.C. |
| Title |
Effects of Disturbance Over 60 Years on a Lowland Forest in Southern Vietnam |
Type |
Journal Article |
| Year |
2010 |
Publication |
Journal of Tropical Forest Science |
Abbreviated Journal |
J. Trop. For. Sci. |
| Volume |
22 |
Issue |
3 |
Pages |
237-246 |
| Keywords |
Lowland tropical forest; disturbance impact; floristic composition; forest structure; Tan Phu forest |
| Abstract |
MILLET J, PASCAL JP & MET LC. 2010. Effects of disturbance over 60 years on a lowland forest in southern Vietnam. Tropical lowland forests are some of the most threatened in the world and this is particularly the case in Vietnam. This study aimed to identify changes in species composition and forest structure in the Tan Phu lowland forest resulting from disturbance over a 60 year period. Analysis of forest composition and structure rely on data from 25 plots of 0.5-ha size established in a lowland secondary forest. The five forest stands described differed greatly from the three forest stand types described in 1943. Some long-lived shade-tolerant species had been replaced by pioneer species, such as Cratoxylon formosum and Shorea roxburghii. In addition to altering composition, forest disturbances had resulted in large changes in forest structure. While in the past, forest stands had a large number of exploitable trees, current forest stands have few trees in the diameter class > 50 cm and sometimes no trees in the diameter class > 80 cm. This paper provides notable results on forest tree ecology, forest dynamics and on the state of secondary forests in Vietnam. This is particularly important as future goods and services will increasingly have to come from such forests. |
| Address |
[Millet, J.] Univ Lyon 1, F-69622 Villeurbanne, France, Email: jerome.millet@ird.if |
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| Publisher |
FOREST RESEARCH INST MALAYSIA |
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Summary Language |
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Original Title |
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Abbreviated Series Title |
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| Series Volume |
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Series Issue |
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Edition |
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| ISSN |
0128-1283 |
ISBN |
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Medium |
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Conference |
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| Notes |
ISI:000280653200003 |
Approved |
no |
| Call Number |
EcoFoG @ webmaster @ |
Serial |
283 |
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| Author |
Marti, G.; Eparvier, V.; Moretti, C.; Prado, S.; Grellier, P.; Hue, N.; Thoison, O.; Delpech, B.; Gueritte, F.; Litaudon, M. |
| Title |
Antiplasmodial benzophenone derivatives from the root barks of Symphonia globulifera (Clusiaceae) |
Type |
Journal Article |
| Year |
2010 |
Publication |
Phytochemistry |
Abbreviated Journal |
Phytochemistry |
| Volume |
71 |
Issue |
8-9 |
Pages |
964-974 |
| Keywords |
Symphonia globulifera; Clusiaceae; Benzophenone; Symphonone; Antiplasmodial; LC/ESI-MS |
| Abstract |
In an effort to find antimalarial drugs, a systematic in vitro evaluation on a chloroquine-resistant strain of Plasmodium falciparum (FcB1) was undertaken on sixty plant extracts collected in French Guiana. The ethyl acetate extract obtained from the root barks of Symphonia globulifera exhibited a strong antiplasmodial activity (97% at 10 μg/ml). The phytochemical investigation of this extract led to the isolation of nine polycyclic polyprenylated acylphloroglucinol (PPAPs) compounds and two oxidized derivatives. All compounds showed antiplasmodial activity with IC(50)s ranged from 2.1 to 10.1 μM. A LC/ESI-MSn study performed on polyprenylated benzophenones previously isolated from Moronobea coccinea provided a reliable method for their detection in the extract and structural elucidation. (C) 2010 Elsevier Ltd. All rights reserved. |
| Address |
[Marti, Guillaume; Hue, Nathalie; Thoison, Odile; Delpech, Bernard; Gueritte, Francoise; Litaudon, Marc] CNRS, Inst Chim Subst Nat, Ctr Rech Gif, F-91198 Gif Sur Yvette, France, Email: marc.litaudon@icsn.cnrs-gif.fr |
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| Publisher |
PERGAMON-ELSEVIER SCIENCE LTD |
Place of Publication |
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Summary Language |
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Abbreviated Series Title |
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Series Issue |
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Edition |
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| ISSN |
0031-9422 |
ISBN |
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Conference |
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| Notes |
ISI:000279077400016 |
Approved |
no |
| Call Number |
EcoFoG @ webmaster @ |
Serial |
284 |
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| Author |
Sobotnik, J.; Sillam-Dusses, D.; Weyda, F.; Dejean, A.; Roisin, Y.; Hanus, R.; Bourguignon, T. |
| Title |
The frontal gland in workers of Neotropical soldierless termites |
Type |
Journal Article |
| Year |
2010 |
Publication |
Naturwissenschaften |
Abbreviated Journal |
Naturwissenschaften |
| Volume |
97 |
Issue |
5 |
Pages |
495-503 |
| Keywords |
Frontal gland; Workers; Soldierless termites; Apicotermitinae; Anoplotermes; Aparatermes |
| Abstract |
The presence of the frontal gland is well established in termite soldiers of Rhinotermitidae, Serritermitidae, and Termitidae. It is one of their main defensive adaptations or even an exclusive weapon. The gland was also occasionally reported in alate imagoes, but never in the worker caste. Here, we report the first observation of a frontal gland in workers of several Neotropical and one African species of Apicotermitinae. The ultrastructure of Aparatermes cingulatus and Anoplotermes nr. subterraneus is described in detail. In these two species, the gland is well-developed, functional and consists of class 1 secretory cells. The presence of envelope cells, wrapping the gland, is an unusual feature, as well as the presence of several zonulae adherens, connecting neighbouring glandular cells. The frontal gland of workers is homologous to this organ in soldiers and imagoes, as evidenced by the same position in the head and its connection to the same muscle. However, the defensive role of the frontal gland in workers remains to be confirmed. |
| Address |
[Sobotnik, Jan; Sillam-Dusses, David; Hanus, Robert] Acad Sci Czech Republic, Inst Organ Chem & Biochem, Res Team Infochem, CR-16610 Prague 6, Czech Republic, Email: robert@uochb.cas.cz |
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| Publisher |
SPRINGER |
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Abbreviated Series Title |
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Series Issue |
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Edition |
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| ISSN |
0028-1042 |
ISBN |
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Conference |
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| Notes |
ISI:000277318800007 |
Approved |
no |
| Call Number |
EcoFoG @ webmaster @ |
Serial |
285 |
| Permanent link to this record |
