scholarly journals Differential Acclimation of Juvenile Sea Urchins Transplanted Across a Metallic Trace Element Gradient within the Bay of Toulon (France)

2020 ◽  
Vol 39 (1) ◽  
pp. 143
Author(s):  
Stéphane Coupé ◽  
Fanny Clergeaud ◽  
Sylvain Couvray ◽  
Gaël Durrieu ◽  
Simone Richard ◽  
...  
Keyword(s):  
Trace Element ◽  
Sea Urchins ◽  
Metallic Trace Element ◽  
Bay Of Toulon

scholarly journals EVALUATION OF THE METALLIC TRACE ELEMENT CONTAMINATION OF COMMON SOLE (SOLEA SOLEA, L. 1758) BY THE WESTERN ALGERIAN COAST

2021 ◽  
Vol 19 (6) ◽  
pp. 4641-4664
Author(s):  
A. TABECHE ◽  
F. BELHOUCINE ◽  
S. BOUHADIBA ◽  
A. ALIOUA ◽  
L. BELHABIB ◽  
...  
Keyword(s):  
Trace Element ◽  
Solea Solea ◽  
Algerian Coast ◽  
Metallic Trace Element ◽  
Trace Element Contamination ◽  
Common Sole

A Practical Trace Element Monitoring System for Intermediate Gas Turbine Fuels

1970 ◽  
Author(s):  
E. S. Obidinski ◽  
K. W. Johnson
Keyword(s):  
Trace Element ◽  
Atomic Absorption ◽  
Gas Turbine ◽  
Monitoring System ◽  
Monitoring Systems ◽  
Interference Effects ◽  
Site Monitoring ◽  
Flame Emission ◽  
The Subject ◽  
Metallic Trace Element

Intermediate fuels (GT-3) are less expensive than distillates and do not cause difficulties in a gas turbine provided the contaminant level of the GT-3 oil is consistently kept below accurately set limits. The key to trouble-free operation is a reliable, relatively inexpensive and fairly fast on-site monitoring system. Experience with such a system was previously reported. The present paper discusses the on-site monitoring systems in some detail. The method provides results for metallic trace element analyses in the order of 10 ppm, within ±0.2 ppm, using the oil ash as the subject of investigation with a flame emission spectrophotometer, a colorimeter and an atomic absorption spectrophotometer. Elimination of interference effects is described and procedures for the appropriate solutions are shown. Investment costs and man-hour requirements are described.

Metallic trace element body burdens and gene expression analysis of biomarker candidates in Eisenia fetida, using an “exposure/depuration” experimental scheme with field soils

2010 ◽  
Vol 73 (5) ◽  
pp. 1034-1045 ◽  
Author(s):  
Fabien Bernard ◽  
Franck Brulle ◽  
Francis Douay ◽  
Sébastien Lemière ◽  
Sylvain Demuynck ◽  
...  
Keyword(s):  
Gene Expression ◽  
Trace Element ◽  
Expression Analysis ◽  
Eisenia Fetida ◽  
Gene Expression Analysis ◽  
Experimental Scheme ◽  
Field Soils ◽  
Metallic Trace Element

Skeletal elements of crinoid echinoderms: High-resolution structural and microanalytical results

1983 ◽  
Vol 41 ◽  
pp. 194-195
Author(s):  
D. F. Blake ◽  
L. F. Allard ◽  
D. R. Peacor
Keyword(s):  
High Resolution ◽  
Marine Invertebrates ◽  
Sea Urchins ◽  
Structural Features ◽  
Sea Stars ◽  
High Resolution Tem ◽  
Relationship Of ◽  
The Relationship ◽  
Insight Into

Echinodermata is a phylum of marine invertebrates which has been extant since Cambrian time (c.a. 500 m.y. before the present). Modern examples of echinoderms include sea urchins, sea stars, and sea lilies (crinoids). The endoskeletons of echinoderms are composed of plates or ossicles (Fig. 1) which are with few exceptions, porous, single crystals of high-magnesian calcite. Despite their single crystal nature, fracture surfaces do not exhibit the near-perfect {10.4} cleavage characteristic of inorganic calcite. This paradoxical mix of biogenic and inorganic features has prompted much recent work on echinoderm skeletal crystallography. Furthermore, fossil echinoderm hard parts comprise a volumetrically significant portion of some marine limestones sequences. The ultrastructural and microchemical characterization of modern skeletal material should lend insight into: 1). The nature of the biogenic processes involved, for example, the relationship of Mg heterogeneity to morphological and structural features in modern echinoderm material, and 2). The nature of the diagenetic changes undergone by their ancient, fossilized counterparts. In this study, high resolution TEM (HRTEM), high voltage TEM (HVTEM), and STEM microanalysis are used to characterize tha ultrastructural and microchemical composition of skeletal elements of the modern crinoid Neocrinus blakei.

Fate of sperm membrane in fertilized ova

1993 ◽  
Vol 51 ◽  
pp. 40-41
Author(s):  
Frank J. Longo
Keyword(s):  
Electron Microscopy ◽  
Electrical Activity ◽  
Sea Urchins ◽  
Morphological Changes ◽  
Integrated System ◽  
Electrophysiological Recording ◽  
Experimental Conditions ◽  
The Status ◽  
Sperm Membrane ◽  
Temporal And Spatial

Measurement of the egg's electrical activity, the fertilization potential or the activation current (in voltage clamped eggs), provides a means of detecting the earliest perceivable response of the egg to the fertilizing sperm. By using the electrical physiological record as a “real time” indicator of the instant of electrical continuity between the gametes, eggs can be inseminated with sperm at lower, more physiological densities, thereby assuring that only one sperm interacts with the egg. Integrating techniques of intracellular electrophysiological recording, video-imaging, and electron microscopy, we are able to identify the fertilizing sperm precisely and correlate the status of gamete organelles with the first indication (fertilization potential/activation current) of the egg's response to the attached sperm. Hence, this integrated system provides improved temporal and spatial resolution of morphological changes at the site of gamete interaction, under a variety of experimental conditions. Using these integrated techniques, we have investigated when sperm-egg plasma membrane fusion occurs in sea urchins with respect to the onset of the egg's change in electrical activity.

Trace element contamination of intravenous solutions

1976 ◽  
Vol 136 (7) ◽  
pp. 782-784 ◽  
Author(s):  
M. M. Jetton
Keyword(s):  
Trace Element ◽  
Trace Element Contamination

Trace element accumulation in short-tailed albatrosses (Diomedea albatrus) and black-footed albatrosses (Diomedea nigripes) from Torishima Island, Japan

2003 ◽  
Vol 107 ◽  
pp. 1231-1234 ◽  
Author(s):  
T. Shinsuke ◽  
I. Tokutaka ◽  
K. Takashi ◽  
T. Miyako ◽  
S. Fumio ◽  
...  
Keyword(s):  
Trace Element ◽  
Element Accumulation ◽  
Trace Element Accumulation
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