Dynamics of canal response to head-shaking test in benign paroxysmal positional vertigo.

Conclusions: Time constant and maximum slow phase velocity (SPV) of head-shaking nystagmus (HSN) demonstrated a differential canal response to head shaking in 24% of patients with posterior canal benign paroxysmal positional vertigo (BPPV). We suggest that vestibular lithiasis has a limited contribution to the mechanism that generates HSN.

Objective: To determine the canal response to head shaking in BPPV.

Monitoring of caloric response and outcome in patients with benign paroxysmal positional vertigo.

Objective: To analyze the time course of caloric response in patients with Benign Paroxysmal Positional Vertigo (BPPV).

Patients: Seventy-four individuals with diagnosis of BPPV during Dix-Hallpike (DH) test.

Study Design: A prospective, longitudinal study.

Mature Amaranthus hypochondriacus seeds contain non-processed 11S precursors.

Amaranth is a dicotyledonous plant whose major seed storage proteins are globulins and glutelins. An unique feature of amaranth seeds is the presence of a fraction named albumin-2, that is extractable with water only after an exhaustive extraction of globulins and albumin-1. In this work, we tested the hypothesis that albumin-2 fraction could be constituted by a non-processed 11S globulin (proglobulin).

Two short sequences from amaranth 11S globulin are sufficient to target green fluorescent protein and beta-glucuronidase to vacuoles in Arabidopsis cells.

Vacuolar sorting of seed storage proteins is a very complex process since several sorting pathways and interactions among proteins of different classes have been reported. In addition, although the C-terminus of several 7S proteins is important for vacuolar delivery, other signals seem also to be involved in this process. In this work, the ability of two sequences of the Amaranthus hypochondriacus 11S globulin (amaranthin) to target reporter proteins to vacuoles was studied.

Anterior semicircular canal benign paroxysmal positional vertigo and positional downbeating nystagmus.

Purpose: The aim of this study was to describe the clinical features and video-oculographic findings in patients with anterior semicircular canal benign paroxysmal positional vertigo (BPPV).

Study Design: This is a prospective case series.

Setting: The study was set at an outpatient clinic in a general hospital.

Multiple positional nystagmus suggests multiple canal involvement in benign paroxysmal vertigo.

Conclusion: Video-oculography demonstrates a higher occurrence of atypical positional nystagmus in patients with benign paroxysmal positional vertigo (BPPV). This includes anterior and horizontal canal variants and multiple positional nystagmus, suggesting combined lesions affecting several canals.

Objective: To analyse the video-oculographic findings of positional tests in patients with BPPV.

Effect of pH and ionic strength modifications on thermal denaturation of the 11S globulin of sunflower (Helianthus annuus).

Helianthinin, the main storage protein of sunflowers, has low water solubility and does not form a gel when heated; this behavior is different from other 11S globulins and limits its food applications. To understand this particular behavior, changes on helianthinin association-dissociation state induced by modifications in pH and ionic strength were analyzed. The influence of these different medium conditions on its thermal stability and tendency to form aggregates was also studied.