Search results for "BD"

Large- and Fine-Scale Geochemical Variations Along the Andean Arc of Northern Chile (17.5°– 22°S)

1994

Geochemical data from 37 volcanic centres from the active volcanic front in the Central Andes between 17.5° and 22°S of northern Chile provide constraints on crustal contributions to arc magma genesis in that region. Crustal thickness, distance from the trench, height above the seismically active subduction zone, and sediment supply to the trench are all constant along this segment of the arc. The only significant variable along the current arc segment is in mean crustal age (Palaeozoic in the south to Proterozoic in the north). In addition, the crustal thickness has varied through time from around 40 km in the Lower Miocene to about 70 km today. Variations along the N-S chain of the volcan…

Zircon dating of Neoproterozoic and Cambrian ophiolites in West Mongolia and implications for the timing of orogenic processes in the central part of…

2014

Abstract We present new isotopic and trace element data to review the geochronological/geochemical/geological evolution of the central part of the Central Asian Orogenic Belt (CAOB), and find a fundamental geological problem in West Mongolia, which has traditionally been subdivided into northwestern early Paleozoic (formerly Caledonian) and southerly late Paleozoic (formerly Hercynian) belts by the Main Mongolian Lineament (MML). We resolve this problem with SHRIMP zircon dating of ophiolites and re-evaluation of much published literature. In Northwest Mongolia the Dariv–Khantaishir ophiolite marks the boundary between the Lake arc in the west and the Dzabkhan–Baydrag microcontinent in the …

Bdnf and Chronic Cerebral Hypoperfusion in Rats. Effects of Exercise

2015

International audience

Impact des modalités d'un exercice physique sur la neuroplasticité. Focus sur les sources de BDNF

2019

Physical exercise (EX) is recognized as the most potent non-pharmacological strategy to positively enhance brain health. From Human and animal studies there is a consensus to involve brain-derived neurotrophic factor (BDNF), a neurotrophin strongly expressed in response to EX and implicated in neuroplasticity mechanisms. Mainly expressed by neurons, BDNF is also expressed by endothelial and muscle cells. Largely sought during a physical effort, endothelium and skeletal muscle could be involved in positive effects induced by EX. Although there is a real consensus about BDNF and cerebral effect of EX, the typology of the better regimen of EX to enhance cerebral plasticity is not known. In thi…

Pētera Šmita sarakste ar Jāni Misiņu sakarā ar lūgumu atsūtīt lugas Vladivostokas Latviešu biedrības teātrim

1916

P. Šmits lūdz J. Misiņu atsūtīt Vladisvotokas Latviešu biedrības teātrim dažādu autoru - gan latviesu, gan cittautu autoru kopumā 40 lugas, Dziesmu lugām vēlētos arī notis. Ja nu gadījuma pats nevarot, tad lai lūgumu nododot citam grāmatu veikalam.

Cosmic Dark Radiation and Neutrinos

2013

New measurements of the cosmic microwave background (CMB) by the Planck mission have greatly increased our knowledge about the universe. Dark radiation, a weakly interacting component of radiation, is one of the important ingredients in our cosmological model which is testable by Planck and other observational probes. At the moment, the possible existence of dark radiation is an unsolved question. For instance, the discrepancy between the value of the Hubble constant, H-0, inferred from the Planck data and local measurements of H-0 can to some extent be alleviated by enlarging the minimal ACDM model to include additional relativistic degrees of freedom. From a fundamental physics point of v…

Uncertainty on w from large-scale structure

2012

We find that if we live at the center of an inhomogeneity with total density contrast of roughly 0.1, dark energy is not a cosmological constant at 95% confidence level. Observational constraints on the equation of state of dark energy, w, depend strongly on the local matter density around the observer. We model the local inhomogeneity with an exact spherically symmetric solution which features a pressureless matter component and a dark-energy fluid with constant equation of state and negligible sound speed, that reaches a homogeneous solution at finite radius. We fit this model to observations of the local expansion rate, distant supernovae and the cosmic microwave background. We conclude …

Schmerz im rechten Oberbauch

2008

The Biocontrol Agent and Insect Pathogen Photorhabdus luminescens Interacts with Plant Roots

2020

ABSTRACT The number of sustainable agriculture techniques to improve pest management and environmental safety is rising, as biological control agents are used to enhance disease resistance and abiotic stress tolerance in crops. Here, we investigated the capacity of the Photorhabdus luminescens secondary variant to react to plant root exudates and their behavior toward microorganisms in the rhizosphere. P. luminescens is known to live in symbiosis with entomopathogenic nematodes (EPNs) and to be highly pathogenic toward insects. The P. luminescens-EPN relationship has been widely studied, and this combination has been used as a biological control agent; however, not much attention has been p…

Microbial acidification and pH effects on trace element release from sewage sludge.

2003

Leaching of sludge-borne trace elements has been observed in experimental and field studies. The role of microbial processes in the mobilization of trace elements from wastewater sludge is poorly defined. Our objectives were to determine trace element mobilization from sludge subjected to treatments representing microbial acidification, direct chemical acidification and no acidification, and to determine the readsorption potential of mobilized elements using calcareous sand. Triplicate columns (10-cm diameter) for incubation and leaching of sludge had a top layer of digested dewatered sludge (either untreated, acidified with H2SO4, or limed with CaCO3; all mixed with glass beads to prevent …