Learn More
  • Dr. Madeleine Olivereau, Christian Aimar, Jean-Michel Olivereau
  • 1980
The cytological responses of the pituitary gland during adaptation to deionized water (DW) were investigated in the goldfish and the eel. In both teleost species, a stimulation of the prolactin (PRL) cells could not be detected, although the levels of blood electrolytes (Na+,Ca2+,Cl−) are reduced in the eel. PRL cells appear less active in DW-adapted eels.(More)
Effects of microgravity (microG) on fertilization were studied in the urodele amphibian Pleurodeles waltl on board the MIR space station. Genetic and cytomorphologic analyses ruled out parthenogenesis or gynogenesis and proved that fertilization did occur in microG. Actual fertilization was demonstrated by the analysis of the distribution of peptidase-1(More)
  • Dr. Madeleine Olivereau, Christian Aimar, Jean-Michel Olivereau
  • 1980
Cytological changes in the pars intermedia of the goldfish were investigated after adding calcium to deionized water (DW). In fish maintained in DW, the PAS-positive cells are highly stimulated in comparison to cells of fish kept in fresh water (FW). In DW supplemented with calcium at the same concentration as in FW (2 mM/l), the hyperactivity of the(More)
  • Dr. Madeleine Olivereau, Jean-Michel Olivereau, Christian Aimar
  • 1981
Cytological changes in the calcium-sensitive (Ca-s) cells (formerly termed PAS-positive cells) of the pars intermedia were investigated in the goldfish after adaptation to deionized water (DW), with or without addition of sodium, potassium and magnesium. These ions were added as chloride salts at concentrations similar to those present in fresh water (FW).(More)
  • Dr. Madeleine Olivereau, Jean-Michel Olivereau, Christian Aimar
  • 1980
Injection of 5-hydroxytryptophan (5-HTP), a precursor of serotonin, induces dispersion of melanin in the amphibians, Pleurodeles waltlii (Urodela) and Xenopus laevis (Anura), in the goldfish, Carassius auratus, and in the carp, Cyprinus carpio. It is accompanied by a dispersion of erythrophore pigments. In the pituitaries of Pleurodeles and goldfish, a(More)
The activity of prolactin (PRL) cells was investigated in goldfish gradually adapted to diluted (30%) artificial seawater (ASW) or directly immersed in 23% ASW and in similar saline solutions free of calcium. When Ca2+ is omitted, PRL cells appear slightly more active than those in saline solutions with calcium, nuclear areas having intermediate values(More)
  • C Aimar
  • 1997
Polyclonal antibodies (IS1) reacting specifically with plasma membrane proteins of the Xenopus oocyte were used to study the formation of new plasma membrane in cleavage furrows. Membrane precursors were detected in the inner cytoplasm, then under the plasma membrane of the animal hemisphere and finally on the furrow's edges. Cycloheximide and colchicine(More)
  • Dr. Madeleine Olivereau, Jean-Michel Olivereau, Christian Aimar
  • 1982
Goldfish kept in diluted Ca-free sea water (SW) (23 or 30 %) or in Ca-Mg-deficient SW (23 %) have a limited survival, release large amounts of mucus, and show spasmodic seizures. Plasma calcium decreases. The PAS-positive calcium-sensitive (Ca-s) cells of the pars intermedia show a low activity in diluted SW and in 23 % Mg-free SW. In diluted Ca-free SW,(More)
Most hybrids betweenBufo bufo andB. calamita obtained by nuclear transplantation become arrested at the early gastrula stage. In both parental controls and the hybrid embryos, the presence and distribution of extracellular matrix was analysed with fluorescent wheat germ agglutinin and by immunolabelling with antibodies directed against fibronectin. InB.(More)