Periodic Bedrock Ridges at the ExoMars 2022 Landing Site: Evidence for a Changing Wind Regime

Wind-formed features are abundant in Oxia Planum (Mars), the landing site of the 2022 ExoMars mission, which shows geological evidence for a past wet environment. Studies of aeolian bedforms at the landing site were focused on assessing the risk for rover trafficability, however their potential in recording climatic fluctuations has not been explored. Here we show that the landing site experienced multiple climatic changes in the Amazonian, which are recorded by an intriguing set of ridges that we interpret as Periodic Bedrock Ridges (PBRs). Clues for a PBR origin result from ridge regularity, defect terminations, and the presence of preserved megaripples detaching from the PBRs. PBR orientation differs from superimposed transverse aeolian ridges pointing toward a major change in wind regime. Our results provide constrains on PBR formation mechanisms and offer indications on paleo winds that will be crucial for understanding the landing site geology.

Osteocondromatose em gato: relato de caso

RESUMO A osteocondromatose é caracterizada por nódulos únicos ou múltiplos decorrentes de um crescimento ósseo excessivo benigno. É encontrada em cães, gatos, equinos e humanos. Em felinos, tem maior incidência dos dois aos quatro anos de idade. A etiologia em gatos está relacionada ao vírus da leucemia felina, e também já foi encontrada relação com o fibrossarcoma. A manifestação clínica depende do local acometido e do tamanho da lesão. O diagnóstico definitivo é por meio de histopatologia e o prognóstico é desfavorável, pois ocorrem muitas recidivas. Este relato de caso objetiva descrever a apresentação dessa enfermidade em um felino jovem.

Torção de cólon em um felino doméstico: relato de caso

RESUMO A torção de cólon em felinos é uma patologia rara. Os principais sinais apresentados são de abdome agudo e podem levar o animal rapidamente a óbito. O presente trabalho tem o objetivo de relatar um caso de torção de cólon em um felino. Este é o primeiro relato dessa enfermidade no Brasil. O diagnóstico foi realizado por meio do histórico e de exames de imagem. O animal foi encaminhado para a cirurgia, mas, devido à gravidade e extensão das lesões intestinais, foi realizada a eutanásia.

Antimicrobial activity of extractives of Solidago microglossa

The antimicrobial activity of the methanol extract from Solidago microglossa roots, essential oil from its aerial part and some isolated compounds was investigated. The oil exhibited concentration-dependent activity against all the tested bacteria and yeasts.

Study on the antimicrobial activity of Hymatanthus sucuba

The antimicrobial activity of Hyamatantus sucuba roots methanol extract, fractions prepared from this extract (n-hexane, CHCl(3), EtOAc, and n-butanol) and some isolated compounds were evaluated against some Gram(+) and Gram(-) bacteria and yeasts.

Spectral analysis of visual potentials evoked by pattern-reversal checkerboard in juvenile patients with headache

Changes in visual evoked potentials, mainly affecting the amplitude of the major positive wave, are referred to by many authors and are related to the pathophysiological basis of primary headache. We performed both transient pattern-reversal visual evoked potentials and spectral analysis by means of fast Fourier transform of 8-Hz steady-state pattern-reversal visual evoked potentials in 34 children affected with migraine (14 with aura, 20 without aura), and compared them with 14 patients with tension-type headache and 10 healthy subjects. The amplitude of the response to the transient stimulation (P100) was higher and the latency shorter in the patients with headache compared with the controls, but the difference was not statistically significant. The absolute power of the first harmonic (1F) obtained by the spectral analysis of the steady-state stimulation was increased in all the patients with headache compared with the controls, and the increase was significant in patients with migraine. These data seem to confirm the hypothesis of abnormal processing of visual input in migraineurs and could be interpreted as neurophysiological support for the theory that different headache types are related conditions. Furthermore, the spectral analysis of steady-state pattern-reversal visual evoked potentials could be proposed as a test to diagnose migraine.

Visual evoked potentials and serum magnesium levels in juvenile migraine patients

Changes in visual evoked potentials and decreased intracellular magnesium levels have been separately described in patients affected by migraine both during the attacks and in the interictal periods. An inverse correlation between increased P100 amplitude and lowered serum magnesium levels was found in children suffering from migraine with and without aura in a headache-free period. A 20-day treatment with oral magnesium pidolate seemed to normalize the magnesium balance in 90% of patients. After treatment, the reduced P100 amplitude confirmed the inverse correlation with the serum magnesium level. These data seem to suggest the hypothesis that higher visual evoked potential amplitude and low brain magnesium level can both be an expression of neuronal hyperexcitability of the visual pathways related to a lowered threshold for migraine attacks.

[Radiculopathy and the organization of health services: applicability verification of a technic for analyzing time factors in diagnostic procedures]

The PERT is a SPR (Reticular Programation System) based on statistic-mathematic models. Since some years they are applied to productive processes to increase the efficiency and effectiveness. They all have a same base structure which is the net that is composed by the logical succession of the event and the activity which has the part of the project. Determining the minimum time (to), the maximum one (tp) and the more frequent time (tm) of each activity and applying the statistic method PERT, one gets the probable duration (te) of every activity and the critical path of the net is placed in evidence. This is formed by the chain of those activities whose duration determines the total duration of the project. The Authors have desired to verify the applicability of SPR even to the "medical industry" and, more precisely, to the diagnostic process for the verification of radiculoneuropathy. Such pathology affects a large part of the active population. The diagnostic process in this case comprises besides an accurate neurological and clinical examination of the patient, also the x-ray exam, the electromyography, the Computed Tomography (CT) and the Magnetic Resonance Imaging (MR) exam. These last two investigations gives an increase of diagnostic accuracy. With the collaboration of the physicians of the diagnostic Service, the Authors have measured in every step of the diagnostic procedure the waiting time of 48 patients with low back pain. Applying the PERT method, it has been possible to put in evidence in the net the critical activities. They are such that their duration time determines the probable duration of the whole diagnostic process. Such duration in this case it corresponds to 91 days with a standard deviation of 33 days. The delay of any critical activity causes a lealy of the whole route. This delay influences negatively on the patient's health. Besides it determines an economic damage to the system because a relation cost/time exists. The systems of reticular programmation have as objective not only the one of improving the programmation and the control of the processes, but also the attainment of an optimum cost/time ratio, varying in a way that the total cost of the realization of the process is minimum. They represent a useful criterion to direct Quality Assurance (Q.A) in the local political sanitary context, within the bounds of organization of technical - scientific quality. An accurate application of the Q.A. should modify besides the duration of the critical activities.