Comparison of slug and pumping tests for hydraulic tomography experiments: a practical perspective     

Daniel Paradis  René Lefebvre  Erwan Gloaguen  Bernard Giroux 《Environmental Earth Sciences》2016,75(16):1159

  相似文献   

Can light intensity cause shifts in natural product and bacterial profiles of the sponge Aplysina aerophoba?          下载免费PDF全文

Oriol Sacristán‐Soriano  Bernard Banaigs  Mikel A. Becerro 《Marine Ecology》2016,37(1):88-105

The potential role of microbial consortia on sponge chemistry is well known. However, how environmental factors affect microbial and chemical profiles and how these shifts affect the sponge holobiont are far from being understood. This study experimentally investigated the effect of light on both the concentration of secondary metabolites and the bacterial assemblages of the sponge Aplysina aerophoba. We quantified major brominated alkaloids (BAs) using a high‐performance liquid chromatography system coupled with a UV‐detector and analysed sponge‐associated bacteria using denaturing gradient gel electrophoresis of 16S rRNA gene amplicons. We identified distinct chemical and bacterial profiles between the ectosome and the choanosome of A. aerophoba. The abundance of most secondary metabolites increased regardless of the illumination regime. We found that the probability of occurrence of three microbial phylotypes (operational taxonomic units 84, 86 and 87) was strongly associated with increasing concentrations of three brominated compounds (aerophobin‐1, aplysinamisin‐1 and isofistularin‐3). Although the role of these bacteria remains uninvestigated, these associations between natural products and specific microbial phylotypes outline further hypotheses that will improve our understanding of the organization and functioning of these complex host–symbiont interactions.  相似文献   

Fluid-mediated alteration of (Y,REE,U,Th)–(Nb,Ta,Ti) oxide minerals in granitic pegmatite from the Evje-Iveland district,southern Norway     

Charley J. Duran  Anne-Magali Seydoux-Guillaume  Bernard Bingen  Sophie Gouy  Philippe de Parseval  Jannick Ingrin  Damien Guillaume 《Mineralogy and Petrology》2016,110(5):581-599

  相似文献   

Characterization of mean transit time at large springs in the Upper Colorado River Basin,USA: a tool for assessing groundwater discharge vulnerability   总被引：1，自引：0，他引：1  

John E. Solder  Bernard J. Stolp  Victor M. Heilweil  David D. Susong 《Hydrogeology Journal》2016,24(8):2017-2033

Environmental tracers (noble gases, tritium, industrial gases, stable isotopes, and radio-carbon) and hydrogeology were interpreted to determine groundwater transit-time distribution and calculate mean transit time (MTT) with lumped parameter modeling at 19 large springs distributed throughout the Upper Colorado River Basin (UCRB), USA. The predictive value of the MTT to evaluate the pattern and timing of groundwater response to hydraulic stress (i.e., vulnerability) is examined by a statistical analysis of MTT, historical spring discharge records, and the Palmer Hydrological Drought Index. MTTs of the springs range from 10 to 15,000 years and 90 % of the cumulative discharge-weighted travel-time distribution falls within the range of 2?10,000 years. Historical variability in discharge was assessed as the ratio of 10–90 % flow-exceedance (R _10/90%) and ranged from 2.8 to 1.1 for select springs with available discharge data. The lag-time (i.e., delay in discharge response to drought conditions) was determined by cross-correlation analysis and ranged from 0.5 to 6 years for the same select springs. Springs with shorter MTTs (<80 years) statistically correlate with larger discharge variations and faster responses to drought, indicating MTT can be used for estimating the relative magnitude and timing of groundwater response. Results indicate that groundwater discharge to streams in the UCRB will likely respond on the order of years to climate variation and increasing groundwater withdrawals.  相似文献   

Society news     

A. Bernard 《Mineralium Deposita》1971,6(2):161-165

  相似文献   

A comparison of type III metric radio bursts and global solar potential field models     

Bernard V. Jackson  Randolph H. Levine 《Solar physics》1981,73(1):183-190

We compare evidence of coronal magnetic fields from polarized metric type III radio bursts with (a) global potential field models, (b) direct averages of the observed photospheric magnetic field, and (c) H synoptic charts. The comparison clearly indicates both that the principal aspects of type III burst radiation are understood and that global potential field models are a significantly more accurate representation of coronal magnetic field structure than either the large-scale photospheric field or H synoptic charts.  相似文献   

A sketch of the geology of the whitehaven district     

Bernard Smith  E.E.L. Dixon  T. Eastwood  C. Edmonds  S.E. Hollingworth 《Proceedings of the Geologists' Association. Geologists' Association》1925,36(1):37-IN9

  相似文献   

Excursion to the Whitehaven District: Saturday,July 26th,to Friday,Aug. 1st, 1924     

Bernard Smith  E.E.L. Dixon  T. Eastwood  C. Edmonds  S.E. Hollingworth 《Proceedings of the Geologists' Association. Geologists' Association》1925,36(1):62-IN10

  相似文献   

    

Ch. Charlier et L. Jones 《Journal of Geodesy》1952,26(1):111-115

  相似文献   

Strike-slip tectonic processes in the northern Caribbean between Cuba and Hispaniola (Windward Passage)     

Eric Calais  Bernard Mercier De Lépinay 《Marine Geophysical Researches》1995,17(1):63-95

Marine geophysical data including Seabeam, seismic reflection, magnetics, gravimetry and side-scan sonar have been recently collected along the northern Caribbean strike-slip plate boundary between Cuba and Hispaniola, in the Windward Passage area. The analysis of this comprehensive data set allows us to illustrate active strike-slip tectonic processes in relation to the kinematics of the Caribbean Plate. We show that the transcurrent plate boundary trace runs straight across the Windward Passage, from the southern Cuban Margin in the west (Oriente Fault) to the Tortue Channel in the east. The Windward Passage Deep is thus not an active pull-apart basin, as previously suggested. The plate boundary geometry implies that the motion of the Caribbean Plate relative to the North American Plate is partitioned between a strike-slip component, accommodated by the Windward Passage active fault zone, and a convergence component, accommodated by compression at the bottom of the Northern Hispaniola Margin. On the basis of a correlation with onland geological data, an age is given to the stratigraphic sequences identified on seismic profiles. A kinematic reconstruction is proposed that follows the tectonic unconformities recognized at sea and on land (Late Eocene, Early Miocene, Middle Miocene and Late Pliocene). Each one of these tectonic events corresponds to a drastic reorganization of the plate boundary geometry. We propose to correlate these events with successive collisions of the northern Caribbean mobile terranes against the Bahamas Bank. During each event, the plate boundary trace is shifted to the south and a part of the Caribbean Plate is accreted to North America.  相似文献