Amor El Abed

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The binding of [3H]-spiperone to partially purified rat anterior pituitary plasma membranes was quantified throughout the estrous cycle in relation with the serum prolactin (PRL) levels. Receptor affinity remained unchanged throughout the cycle (Kd:0.08-0.16 nM). The number of receptors was constantly high from diestrus I 10.30 h to proestrus 10.30 h, as(More)
Serum luteinizing hormone, follicle-stimulating hormone, prolactin, thyroid-stimulating hormone, and growth hormone and hypothalamic luliberin and thyroliberin contents were measured at given times of the estrous cycle in a dimethylbenz(a)anthracene (DMBA)-susceptible strain of rat (Sprague-Daw ley) and in a DMBA-resistant strain of rat (Wistar) for periods(More)
Testosterone, androstenedione, progesterone, 17-hydroxyprogesterone, estrone and estradiol-17 beta serum levels were measured at given times after dimethylbenz (a) anthracene (DMBA) treatment of a sensitive rat strain Sprague-Dawley (S-D) and a resistant strain Wistar (W). Tumors appeared with a 100% incidence around the 14th to 15th estrous cycle after(More)
Seasonal variation in the gonad weight and biochemical composition of the sea urchin Paracentrotus lividus from the Golf of Tunis (Tunisia) were studied between September 2003 and August 2004. The highest gonad indices occurred in March (16.71%). The spawning period occurred between April and July and resulted in a fall in gonad indices to low level (7.12 ±(More)
Spirulina platensis (=Arthrospira platensis) is a tunisian strain which has been isolated for the first time in Oued Essed (Sousse, Sidi Bou Ali). Biomass evolution, proteins, chlorophylls and fatty acids composition of this alga were monitored by varying nitrogen concentrations in the culture medium. Nitrogen stress was provoked by adding sodium nitrate(More)
The aim of this work was to assess the relative importance of natural fluctuations in metallothionein-like protein (MTLP) levels associated with the sexual status of fish versus fluctuations due to metal exposure. In order to see fluctuations due to metal exposure, comparisons were made on the same fish species Scorpaena porcus sampled in polluted and(More)
Previous studies have shown that substance P (SP), an undecapeptide widely distributed in the gastrointestinal tract and in the peripheral and central nervous system, is a putative regulatory peptide involved in the control of reproductive function. Specifically, SP inhibited, at the anterior pituitary (AP) level, the stimulatory action of a physiological(More)
Bovine lutropin and its subunits were submitted to oxidation by sodium periodate or chloramine T. Methionine residues were easily oxidized but partial destruction of fucose was observed. After oxidation treatment most of the lutropin exhibits the same elution volume in gel filtration as the native hormone. Sucrose gradient sedimentation or gel filtration(More)