RESUMO
The aerial parts of Centaurea calcitrapa L. afforded a new aromatic dimer, alpha-[4-hydroxy-3-methoxyphenyl]-beta-[1'-[5'-[gamma'- hydroxypropyl]]-2'-hydroxy-3'-methoxyphenyl] propanol [1], and the elemanolide [II] obtained for the first time from Egyptian Centaurea species. The structures of the isolated compounds were assessed by spectral analysis
Assuntos
Extratos Vegetais/isolamento & purificaçãoRESUMO
Serum and seminal levels of thyroxine [T[4]] and triiodothyronine [T[3]] were evaluated and correlated with the semen quality of two groups of Friesian bulls. The first group [I] was of high semen quality while the second [II] represented bulls of moderate quality. Obtained data clarified that serum T[4] and T[3] levels were significantly higher in bulls of group I than those of group II. Serum T[4]/T[3] ratio was nearly similar in both groups. Seminal plasma T[3] contents of group I were higher than their corresponding values of group II, while T[4] concentrations of the second group were sharply greater than those of the first group. It was concluded that a reverse relationship is found between seminal T[4]/T[3] ratio and semen quality. T[3] has the upper hand in regulating semen activity. Decreased conversion of T[4] into T[3] in semen leads to an imbalance among both hormones which could be considered as a factor responsible for inhibited sperm activity
Assuntos
AnimaisRESUMO
Both serum FSH and LH levels as well as their specific protein binding activity were determined during different phases of follicular development in she camels using the ELISA technique. Gonadotropins and their specific binding capacities in the serum showed certain fluctuation which match with the requirements of the functional activity of the ovaries. It was concluded that ovarian activity in she camel depends not only on the level of serum gonadotropins but also on the variations of their specific binding potencies