Spin crossover in ferropericlase at high pressure: a seismologically transparent transition?     

Antonangeli D  Siebert J  Aracne CM  Farber DL  Bosak A  Hoesch M  Krisch M  Ryerson FJ  Fiquet G  Badro J 《Science (New York, N.Y.)》2011,331(6013):64-67

Seismic discontinuities in Earth typically arise from structural, chemical, or temperature variations with increasing depth. The pressure-induced iron spin state transition in the lower mantle may influence seismic wave velocities by changing the elasticity of iron-bearing minerals, but no seismological evidence of an anomaly exists. Inelastic x-ray scattering measurements on (Mg(0.83)Fe(0.17))O-ferropericlase at pressures across the spin transition show effects limited to the only shear moduli of the elastic tensor. This explains the absence of deviation in the aggregate seismic velocities and, thus, the lack of a one-dimensional seismic signature of the spin crossover. The spin state transition does, however, influence shear anisotropy of ferropericlase and should contribute to the seismic shear wave anisotropy of the lower mantle.  相似文献   

How do veterinarians influence sales of antimicrobials? A spatial‐temporal analysis of the French prescribing‐delivery complex in cattle     

Guillaume Lhermie  Yrj Tapio Grhn  Thomas Serrand  Pierre Sans  Didier Raboisson 《Zoonoses and public health》2020,67(3):231-242

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The Chlamydomonas genome reveals the evolution of key animal and plant functions   总被引：1，自引：0，他引：1  

Merchant SS  Prochnik SE  Vallon O  Harris EH  Karpowicz SJ  Witman GB  Terry A  Salamov A  Fritz-Laylin LK  Maréchal-Drouard L  Marshall WF  Qu LH  Nelson DR  Sanderfoot AA  Spalding MH  Kapitonov VV  Ren Q  Ferris P  Lindquist E  Shapiro H  Lucas SM  Grimwood J  Schmutz J  Cardol P  Cerutti H  Chanfreau G  Chen CL  Cognat V  Croft MT  Dent R  Dutcher S  Fernández E  Fukuzawa H  González-Ballester D  González-Halphen D  Hallmann A  Hanikenne M  Hippler M  Inwood W  Jabbari K  Kalanon M  Kuras R  Lefebvre PA  Lemaire SD  Lobanov AV 《Science (New York, N.Y.)》2007,318(5848):245-250

Chlamydomonas reinhardtii is a unicellular green alga whose lineage diverged from land plants over 1 billion years ago. It is a model system for studying chloroplast-based photosynthesis, as well as the structure, assembly, and function of eukaryotic flagella (cilia), which were inherited from the common ancestor of plants and animals, but lost in land plants. We sequenced the approximately 120-megabase nuclear genome of Chlamydomonas and performed comparative phylogenomic analyses, identifying genes encoding uncharacterized proteins that are likely associated with the function and biogenesis of chloroplasts or eukaryotic flagella. Analyses of the Chlamydomonas genome advance our understanding of the ancestral eukaryotic cell, reveal previously unknown genes associated with photosynthetic and flagellar functions, and establish links between ciliopathy and the composition and function of flagella.  相似文献   

Asymmetric tethering of flat and curved lipid membranes by a golgin     

Drin G  Morello V  Casella JF  Gounon P  Antonny B 《Science (New York, N.Y.)》2008,320(5876):670-673

Golgins, long stringlike proteins, tether cisternae and transport vesicles at the Golgi apparatus. We examined the attachment of golgin GMAP-210 to lipid membranes. GMAP-210 connected highly curved liposomes to flatter ones. This asymmetric tethering relied on motifs that sensed membrane curvature both in the N terminus of GMAP-210 and in ArfGAP1, which controlled the interaction of the C terminus of GMAP-210 with the small guanine nucleotide-binding protein Arf1. Because membrane curvature constantly changes during vesicular trafficking, this mode of tethering suggests a way to maintain the Golgi architecture without compromising membrane flow.  相似文献   

Lung lobe torsion in 15 dogs: Peripheral band sign on ultrasound     

Audrey Belmudes  Guillaume Gory  Eddy Cauvin  Anaïs Combes  Hlne Gallois‐Bride  Laurent Couturier  Delphine N. Rault 《Veterinary radiology & ultrasound》2021,62(1):116-125

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Sensitivity to habitat fragmentation across European landscapes in three temperate forest herbs     

Naaf  Tobias  Feigs  Jannis Till  Huang  Siyu  Brunet  Jörg  Cousins  Sara A. O.  Decocq  Guillaume  De Frenne  Pieter  Diekmann  Martin  Govaert  Sanne  Hedwall  Per-Ola  Helsen  Kenny  Lenoir  Jonathan  Liira  Jaan  Meeussen  Camille  Plue  Jan  Poli  Pedro  Spicher  Fabien  Vangansbeke  Pieter  Vanneste  Thomas  Verheyen  Kris  Holzhauer  Stephanie I. J.  Kramp  Katja 《Landscape Ecology》2021,36(10):2831-2848

Landscape Ecology - Evidence for effects of habitat loss and fragmentation on the viability of temperate forest herb populations in agricultural landscapes is so far based on population genetic...  相似文献   

Outcomes of dogs treated for extrahepatic congenital portosystemic shunts with thin film banding or ameroid ring constrictor     

Matt Matiasovic DVM  PGCert  Guillaume P. A. Chanoit DEDV  PhD  DECVS  DACVS  FHEA  Lee B. Meakin MA  Mres  PhD  VetMB  DECVS  Mickey S. Tivers BVSc  PhD  CertSAS  DECVS 《Veterinary surgery : VS》2020,49(1):160-171

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Catch me if you can: novel foraging behavior of an egg parasitoid,Gryon gonikopalense,against the stinkbug pest,Bagrada hilaris     

Martel  Guillaume  Sforza  René F. H. 《Journal of pest science》2021,94(4):1161-1169

Journal of Pest Science - Host detection and parasitism by egg parasitoids involve host chemical recognition, spatial overlapping, and the ability to overcome physical barriers. Within the context...  相似文献   

Stabilization and plant uptake of N from N-labelled pea residue 16.5 years after incorporation in soil     

Guillaume Laberge  Per Ambus  Henrik Hauggaard-Nielsen  Erik Steen Jensen 《Soil biology & biochemistry》2006,38(7):1998-2000

The decline of N from ¹⁵N-labelled mature pea residues was followed in unplanted soil over 16.5 yr. Eight years after residue incorporation, 24% of the residue ¹⁵N input was still present in the soil and, after 16.5 yr, 16% of the residue ¹⁵N input remained. A double exponential model successfully described the decay of N from ¹⁵N-labelled pea residues. The total residual ¹⁵N declined with average decay constants of 1.45 yr⁻¹ for the 30 d to 1 yr period and of 0.07 yr⁻¹ for the 1-16 yr period. Sixteen years following incorporation of the residues, indicator plants growing in residues-amended soils were obtaining 1.7% of their N from residue N. This is, to our knowledge, the longest study on decay of N in soils from ¹⁵N-labelled crop residues. The current study thus provides a unique data set for our empirical understanding of N-dynamics in agricultural systems, which is a prerequisite to parameterize and validate N-simulation models.  相似文献   

Skin mucus of Cyprinus carpio inhibits cyprinid herpesvirus 3 binding to epidermal cells     

Raj VS  Fournier G  Rakus K  Ronsmans M  Ouyang P  Michel B  Delforges C  Costes B  Farnir F  Leroy B  Wattiez R  Melard C  Mast J  Lieffrig F  Vanderplasschen A 《Veterinary research》2011,42(1):92

ABSTRACT: Cyprinid herpesvirus 3 (CyHV-3) is the aetiological agent of a mortal and highly contagious disease in common and koi carp. The skin is the major portal of entry of CyHV-3 in carp after immersion in water containing the virus. In the present study, we used in vivo bioluminescence imaging to investigate the effect of skin mucus removal and skin epidermis lesion on CyHV-3 entry. Physical treatments inducing removal of the mucus up to complete erosion of the epidermis were applied on a defined area of carp skin just before inoculation by immersion in infectious water. CyHV-3 entry in carp was drastically enhanced on the area of the skin where the mucus was removed with or without associated epidermal lesion. To investigate whether skin mucus inhibits CyHV-3 binding to epidermal cells, tail fins with an intact mucus layer or without mucus were inoculated ex vivo. While electron microscopy examination revealed numerous viral particles bound on the fins inoculated after mucus removal, no particle could be detected after infection of mucus-covered fins. Finally, anti-CyHV-3 neutralising activity of mucus extract was tested in vitro. Incubation of CyHV-3 with mucus extract reduced its infectivity in a dose dependent manner. The present study demonstrates that skin mucus removal and epidermal lesions enhance CyHV-3 entry in carp. It highlights the role of fish skin mucus as an innate immune protection against viral epidermal entry.  相似文献