Sunken wood habitat for thiotrophic symbiosis in mangrove swamps     

Mélina C.Z. Laurent  Olivier Gros  Jean-Pierre Brulport  Françoise Gaill  Nadine Le Bris 《Marine environmental research》2009,67(2):83-88

Large organic falls to the benthic environment, such as dead wood or whale bones, harbour organisms relying on sulfide-oxidizing symbionts. Nothing is known however, concerning sulfide enrichment at the wood surface and its relation to wood colonization by sulfide-oxidizing symbiotic organisms.In this study we combined in situ hydrogen sulfide and pH measurements on sunken wood, with associated fauna microscopy analyses in a tropical mangrove swamp. This shallow environment is known to harbour thiotrophic symbioses and is also abundantly supplied with sunken wood. A significant sulfide enrichment at the wood surface was revealed. A 72 h sequence of measurements emphasized the wide fluctuation of sulfide levels (0.1–>100 μM) over time with both a tidal influence and rapid fluctuations. Protozoans observed on the wood surface were similar to Zoothamnium niveum and to vorticellids. Our SEM observations revealed their association with ectosymbiotic bacteria, which are likely to be sulfide-oxidizers. These results support the idea that sunken wood surfaces constitute an environment suitable for sulfide-oxidizing symbioses.  相似文献   

Cosmic structures, parameters & temperature anisotropies: Status and perspectives     

François R. Bouchet 《Astrophysics and Space Science》2004,290(1-2):69-85

After recalling the current understanding of the formation of the large scale structures of the Universe which the distribution of galaxies revealed, I review what the imprint on the Cosmic Microwave Background (CMB) of the seeds of these structures can tell us, has already told us, and what it should tell us within the next five years.  相似文献   

Star formation in starburst galaxies from near-IR spectroscopy and evolutionary population synthesis     

A. Lançon  B. Rocca-Volmerange 《Astrophysics and Space Science》1994,217(1-2):271-272

We show that the combined study of the near-IR Stellar Energy Distribution (SED) and emission lines in IR luminous starburst galaxies, using evolutionary population synthesis, gives constraints both on the star formation (SF) parameters and on the relative spatial distribution of the components (burst stars, evolved stars, H II regions, dust). We also note that the He I λ 2.06/Br _γ ratio, used to constrain the stellar upper mass limit, is sensitive to a variety of other factors that should be accounted for.  相似文献   

Cosmological Models with Variable G and Λ     

Can Battal Kılınç 《Astrophysics and Space Science》2004,289(1-2):103-109

Einstein's equations with variable gravitational and cosmological constants are considered in the presence of a perfect fluid for the anizotropic Bianchi I universe in a way which conserving the energy-momentum tensor. Two solutions are found, one of which the cosmological term varies inversely with power law of time. The other of which cosmological term is constant.  相似文献   

A rational method for determining the swelling pressure of expansive soils: Paired swell test (PS-test)     

Selçuk  Levent 《Acta Geotechnica》2022,17(8):3161-3180

Acta Geotechnica - Experimental investigations on the expansion behavior of clayey soils are of great importance to correctly understand the response of the soil–foundation. In this context,...  相似文献   

Properties and Comparison of Some Kriging Sub-model Aggregation Methods     

Bachoc  François  Durrande  Nicolas  Rullière  Didier  Chevalier  Clément 《Mathematical Geosciences》2022,54(5):941-977

Mathematical Geosciences - Kriging is a widely employed technique across computer experiments, machine learning and geostatistics. An important challenge for kriging is its high costs when dealing...  相似文献   

Accelerated weathering of hydrophobized sands     

Lin  Hongjie  Lourenço  Sérgio D. N. 《Acta Geotechnica》2022,17(2):377-390

Acta Geotechnica - Hydrophobized sands have been suggested as materials for hydraulic barriers in infrastructure. When placed at the interface ground–atmosphere, environmental factors such as...  相似文献   

A uranium bioremediation reactive transport benchmark     

Steven B. Yabusaki  Sevinç S. Şengör  Yilin Fang 《Computational Geosciences》2015,19(3):551-567

  相似文献   

Can shallow open-loop hydrothermal well-doublets help remediate seawater intrusion?     

François De Keuleneer  Philippe Renard 《Hydrogeology Journal》2015,23(4):619-629

  相似文献   

Multiple advances of Alpine glaciers into the Jura Mountains in the Northwestern Switzerland     

Angela Graf  Naki Akçar  Susan Ivy-Ochs  Stefan Strasky  Peter W. Kubik  Marcus Christl  Martin Burkhard  Rainer Wieler  Christian Schlüchter 《Swiss Journal of Geoscience》2015,108(2-3):225-238

  相似文献