The circulating levels of of radioimmunoassayable LH and FSH in three postmenopausal women were measured in samples drawn at one minute intervals for a period of 150 or 300 min in order to ascertain the existance of short term oscillation on the plasma content of pituitary gonadotropins. Radioimmunoassay methods and sampling procedures fulfilled all the requirements of quality control. Rapid and non-coincident oscillation in the plasma levels of both LH and FSH at the interval studied were observed in all cases. Statistical analysis disclosed that in addition to short-term gonadotropin fluctuation, the data successfully fit in a 120 min periodic function and the graph resembled a sine wave that was also compatible with an ultradian oscillatory pattern.
We report the occurrence of the invasive amphipod Monocorophium acherusicum in Mar del Plata port, Argentina, using morphological and molecular analysis and estimated mean abundance to detect monthly variations of this population. We compared M. acherusicum morphology with that of M. insidiosum and Crassicorophium bonelli, the two most similar locally occurring species, to establish the diagnostic characteristics for the correct identification of them; moreover, we provide some taxonomic notes about others corophiids regionally distributed. M. acherusicum were collected in a subtidal biofouling community and its mean abundance was maximum in summer. In the molecular analysis, the maximumlikelihood tree showed that specimens from Mar del Plata were clustered with M. acherusicum specimens from GenBank and Boldsystems. We support and confirm the species identity in Mar del Plata port using DNA barcoding and with taxonomic methods.
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