A. Boudou

Université de Bordeaux

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Francis Ribeyre

Maison des Sciences de l'Homme

J.-C. Marchetaux

Hôpital Jean Jaurès

Agnès Feurtet‐Mazel

Environnements et Paléoenvironnements Océaniques et Continentaux

B.S. Doyle

Intel (United States)

Marc Bourcerie

Laboratoire d'Informatique et d'Automatique pour les Systèmes

Michel Coste

Centre d'Études Scientifiques et Techniques d'Aquitaine

Régine Maury‐Brachet

Environnements et Paléoenvironnements Océaniques et Continentaux

M. Odin

Université de Bordeaux

Alexandre Gélabert

Université Paris Cité

Oleg S. Pokrovsky

Géosciences Environnement Toulouse

Cooperative Institutions

Centre National de la Recherche Scientifique

123

Université de Bordeaux

Environnements et Paléoenvironnements Océaniques et Continentaux

Inserm

Université Toulouse III - Paul Sabatier

Institut Polytechnique de Bordeaux

Centre d'Études Scientifiques et Techniques d'Aquitaine

Écologie Fonctionnelle et Écotoxicologie des Agroécosystèmes

Laboratoire de Physique des deux infinis Bordeaux

Laboratoire de Chimie

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Fundamental Concepts in Aquatic Ecotoxicology

CRC Press eBooks (2018)

A. Boudou Francis Ribeyre

Species to be used in toxicity tests are obtained from two principal sources. Toxicity may be affected by the action of such factors upon the chemical speciation of the toxicant and hence its availability and also by their action upon the test organism and so its response to the toxicant. Through-flow systems greatly improve the constancy of toxicant concentrations and other conditions within test vessels and, where desirable, facilitate a higher concentration of test organisms. Traditionally, fish have been the principal group used in aquatic toxicology. Several freshwater triclads can be maintained without difficulty in the laboratory and although toxicity tests with triclads were carried out as long ago as 1937 by Jones, the group does not play a major role in aquatic toxicology. Tests may be of very simple design and, therefore, cheap and easily replicated or on the other hand, very complex, allowing precise control of experimental factors and simulation of environmental conditions.

Toxicant

Aquatic toxicology

10.1201/9781351069854-4

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Citations (7)

Raman-scattering investigations in tetragonal tungsten bronze compounds. I.Ba2NaNb5

Physical review. B, Condensed matter (1980)

A. Boudou J. Sapriel

Raman-scattering experiments have been performed on ${\mathrm{Ba}}_{2}$Na${\mathrm{Nb}}_{5}$${\mathrm{O}}_{15}$ crystals between 600 and 1.5 K. All the optical modes at $k=0$ which are Raman active have been systematically investigated. No soft mode has been observed concerning the paraelastic-ferroelastic transition at ${T}_{0}\ensuremath{\simeq}575$ K. The most obvious effect of this transition is the splitting of the $E$ modes of the quadratic phase into the ${B}_{1}(x)$ and ${B}_{2}(y)$ modes of the orthorhombic phase. The lowest-frequency ${B}_{2}(y)$ line gives rise to a Raman-inactive mode above ${T}_{0}$. Besides, this line is a feature characteristic of the orthorhombic structure. The evolution of its frequency (which softens markedly on cooling) as well as its intensity (which gives an estimate of the magnitude of the crystal orthorhombicity) is given versus temperature from ${T}_{0}$ to 1.5 K. The investigations are extended to ${\mathrm{Ba}}_{2+x}{\mathrm{Na}}_{1\ensuremath{-}2x}{\mathrm{Nb}}_{5}{\mathrm{O}}_{15}$ with respect to the variable $x$, these solid solutions being studied as single crystals or as polycrystalline ceramics. Substitutions of the cations (Ba by Sr and Na by K) and the Nb atoms by Ta, Ti, and W are also examined in ceramic samples by means of Raman scattering, the study being principally focused on the low-frequency vibrational spectra.

Orthorhombic crystal system

Tetragonal crystal system

Intensity

10.1103/physrevb.21.61

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Citations (56)

Temperature and pH Effects on Cadmium and Methylmercury Bioaccumulation by Nymphs of the Burrowing Mayfly Hexagenia rigida, from Water Column or Sediment Source

Archives of Environmental Contamination and Toxicology (1996)

M. Odin Francis Ribeyre A. Boudou

Methylmercury

Microcosm

10.1007/s002449900117

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Citations (2)

Mercury in the food web: accumulation and transfer mechanisms.

PubMed (1997)

A. Boudou Francis Ribeyre

Mercury

Source

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Citations (146)

Inorganic mercury and methylmercury bioaccumulation by nymphs of the burrowing mayfly hexagenia rigida from the water column as the initial contamination source ‐ quantification of the actions and interactions with temperature, Ph and photoperiod

Toxicological & Environmental Chemistry Reviews (1995)

M. Odin Agnès Feurtet‐Mazel Francis Ribeyre A. Boudou

The actions and interactions of temperature, photoperiod and water column pH on inorganic mercury (Hgll‐HgCl2) and methylmercury (MeHg‐CH3HgCl) bioaccumulation by a burrowing mayfly were studied. Mercury was added twice daily to the water column (8 μgHg/3L/day) for 15 days. Highest Hg bioaccumulation in the nymphs was observed after addition of MeHg. Significant interactions between Hg chemical form and the two abiotic factors “temperature”; and “water column pH”; were observed. Increasing the temperature from 10 to 18°C led to an increase in Hg bioaccumulation, followed by a significant decrease between 18 and 26°C. Effects of acidification of the water column were dependent on the chemical form of the metal. For Hgll, an increase in Hg accumulation by H. rigida nymphs was observed at pH 5.0; the opposite pH effect occured after contamination with MeHg.

Methylmercury

Mercury

Bioconcentration

10.1080/02772249509358167

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Citations (7)

Suppression of the lateral diffusion under the gate of an MOS transistor by argon implantation

IEEE Transactions on Electron Devices (1985)

J.-C. Marchetaux B.S. Doyle A. Boudou P. Merenda

A new technique for eliminating the overlap diffusion of the source and drain in MOS devices is reported. This technique involves the implantation of argon in the source and drain regions following the arsenic implant, using the same auto-aligned gate. The results show that, compared to the conventional process, a reduction in the lateral diffusion of arsenic is observed, which results in negligible gate-junction overlap encroachment and a consequent gain in device speed. Furthermore, improvements in source-drain breakdown voltages, punchthrough voltages, and substrate currents are also seen.

10.1109/t-ed.1985.22304

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Citations (6)

Mantle and gill fine structure in the freshwater Asiatic clam,Corbicula fluminea(Müller)

Annales de Limnologie - International Journal of Limnology (1997)

S. Lemaire-Gony A. Boudou

The epithelia of the main organs likely to be involved in contaminant uptake, viz. mantle and gill were studied in the Asiatic clam Corbicula fluminea as a base for future ecotoxicological studies. On its margin, the mantle epithelium displays three folds separated by two grooves. The outer epithelium made of cubic cells, and the periostracal groove are involved in the formation is composed of the shell, secreting crystals and the periostracal lamella respectively. In the median area, the inner epithelium is composed of three cell types: ordinary epithelial cells, ciliated cells and mucocytes. The gill epithelium displays two structurally and functionally different areas: a respiratory area in the interlamellar chamber and, on the opposite side, a ciliated epithelium. The respiratory epithelium is composed of thin pavement epithelial cells. The ciliated epithelium is made of different cell types: lateral ciliated epithelial cells, secretory cells, latero-frontal ciliated cells and ciliated frontal cells. The role of the secretory cells is particularly discussed in relation to their structural similarity with lower vertebrate chloride cells (ionocytes) involved in iono- and osmoregulation processes.

Lamella (surface anatomy)

10.1051/limn/1997016

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Citations (12)

Impact of Cadmium and Zinc Prior Exposure on 110m Silver, 58+60 Cobalt and 137 Cesium Uptake by Two Freshwater Bivalves During a Brief Field Experiment

Bulletin of Environmental Contamination and Toxicology (2002)

Christelle Adam‐Guillermin B. Fraysse J. Garnier-Laplace J. P. Baudin A. Boudou

Caesium

10.1007/s001280272

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Citations (1)

Hexagenia rigida (ephemeroptera) as a biological model in aquatic ecotoxicology: Experimental studies on mercury transfers from sediment