D L Acuña

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a r t i c l e i n f o Keywords: Cordillera Blanca Glacier change Climate change Equilibrium-line altitude (ELA) Precipitation Air temperature The total glacial area of the Cordillera Blanca, Peru, has shrunk by more than 30% in the period of 1930 to the present with a marked glacier retreat also in the recent decades. The aim of this paper is to assess(More)
The role of the pituitary-adrenal axis on receptor binding and diurnal rhythmicity of benzodiazepines (BNZ) was assessed in the rat cerebral cortex. Groups of intact, adrenalectomized (ADx) and/or hypophysectomized (HPx) rats were killed at six different time intervals during the 24-hour cycle. BNZ binding was estimated by Scatchard analysis of(More)
As part of a project aimed at elucidating mechanisms of vestibulocollic control in the red-eared turtle Pseudemys scripta, we have calculated the planar relations of its semicircular canals using principal-components analysis. This information is prerequisite to understanding the pattern of canal activation that is set up by head movement of any spatial(More)
The functional development of semicircular canals and some brainstem structures of the auditory system was followed in parallel with time in control and propylthiouracyl-induced hypothyroid pigmented rats by respective recording of postrotatory nystagmus response and auditory evoked brainstem potentials, with the aim of discovering the timing of permanent(More)
Previous studies indicate that the pineal gland alters prolactin secretion, and it was suggested that at least part of the effect of the pineal hormone melatonin on prolactin release may be mediated by the hypothalamic structures. In this study, pinealectomy and lesions of the suprachiasmatic nuclei were found to alter serum levels of prolactin in the same(More)
Glutamate decarboxylase and choline acetyltransferase were measured in homogenated ampullar cristae of rats during development from postnatal day 13 to 60 to determine changes in levels of these enzymes during early postnatal development. Afferent and efferent innervation of the hair cells of the developing cristae were studied using electron microscopy. In(More)
The vestibular cell type affected by congenital hypothyroidism (CH) was investigated by measuring the activity of glutamate decarboxylase (GAD) and choline acetyltransferase (ChAT), synthesizing enzymes of putative afferent (GABA) and efferent (acetylcholine, ACh) neurotransmitters and thus, respectively, hair cell I and II (HC-I, HC-II), and efferent(More)
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