Trajectory-dependent energy loss for swift He atoms axially scattered off a silver surface

Angle- and energy-loss- resolved distributions of helium atoms grazingly scattered from a Ag(110) surface along low indexed crystallographic directions are investigated considering impact energies in the few keV range. Final projectile distributions are evaluated within a semi-classical formalism that includes dissipative effects due to electron-hole excitations through a friction force. For mono-energetic beams impinging along the $[1\bar{1}0]$, $[1\bar{1}2]$ and $[1\bar{1}0]$ directions, the model predicts the presence of multiple peak structures in energy-loss spectra. Such structures provide detailed information about the trajectory-dependent energy loss. However, when the experimental dispersion of the incident beam is taken into account, these energy-loss peaks are completely washed out, giving rise to a smooth energy-loss distribution, in fairly good agreement with available experimental data

Fluid therapy in neurotrauma: basic and clinical concepts

The patient with head trauma is a challenge for the emergency physician and for the neurosurgeon. Currently traumatic brain injury constitutes a public health problem. Knowledge of the various therapeutic strategies to provide support in the prehospital and perioperative are essential for optimal care. Rapid infusion of large volumes of crystalloids to restore blood volume and blood pressure quickly is now the standard treatment for patients with combined TBI and HS The fluid in patients with brain and especially in the carrier of brain injury is a critical topic; we present a review of the literature about the history, physiology of current fluid preparations, and a discussion regard the use of fluid therapy in traumatic brain injury and decompressive craniectomy

Activation of the Plasmodium egress effector subtilisin-like protease 1 is mediated by plasmepsin X destruction of the prodomain

Following each round of replication, daughter merozoites of the malaria parasite Plasmodium falciparum escape (egress) from the infected host red blood cell (RBC) by rupturing the parasitophorous vacuole membrane (PVM) and the RBC membrane (RBCM). A proteolytic cascade orchestrated by a parasite serine protease, subtilisin-like protease 1 (SUB1), regulates the membrane breakdown. SUB1 activation involves primary autoprocessing of the 82-kDa zymogen to a 54-kDa (p54) intermediate that remains bound to its inhibitory propiece (p31) postcleavage. A second processing step converts p54 to the terminal 47-kDa (p47) form of SUB1. Although the aspartic protease plasmepsin X (PM X) has been implicated in the activation of SUB1, the mechanism remains unknown. Here, we show that upon knockdown of PM X, the inhibitory p31-p54 complex of SUB1 accumulates in the parasites. Using recombinant PM X and SUB1, we show that PM X can directly cleave both p31 and p54. We have mapped the cleavage sites on recombinant p31. Furthermore, we demonstrate that the conversion of p54 to p47 can be effected by cleavage at either SUB1 or PM X cleavage sites that are adjacent to one another. Importantly, once the p31 is removed, p54 is fully functional inside the parasites, suggesting that the conversion to p47 is dispensable for SUB1 activity. Relief of propiece inhibition via a heterologous protease is a novel mechanism for subtilisin activation

Kesici-delici alet yaralanmalarında penetran kardiyak travma: Kardiyak bölgenin doğru tanısına ilişkin bir çalışma

BACKGROUND: Stab wounds (SW) to the thorax raises suspicion for cardiac injuries; however, the topographic description is variable. The present study aims to evaluate different topographical descriptions within the thorax and establish their diagnostic value in penetrating cardiac trauma by SW. METHODS: Medical records of all patients admitted to our center with thoracic SW from January 2013 to June 2016 were included in this study. Diagnostic value potential was measured using different areas of the thorax described in the literature. RESULTS: In this study, we analyzed 306 cases. Thirty-eight (12.4%) patients had a cardiac injury managed surgically. Death by cardiac injury occurred in seven (18.4%) patients. The cardiac area defined between the right mid-clavicle line until the left anterior axillary line, and between 2nd and 6th intercostal spaces was the more accurate. It has sensitivity of 97.3%, specificity 72%, positive predictive value 33%, negative predictive value 99.4% and accuracy 75.1% for penetrating cardiac trauma. ROC was 0.894 IC 95% (0.760–0.901). CONCLUSION: Among the thoracic areas, topographical limits between the right mid-clavicle line and the left anterior axillary line, and between 2nd and 6th intercostal spaces are the more accurate and are highly indicative of cardiac injury in patients with SW to the thorax

Evaluación de un Articulador Virtual para la identificación de interferencias en movimientos mandibulares excéntricos

El objetivo del estudio fue determinar la concordancia del articulador virtual Whip-Mix Denar Mark 330 soportado por 3 Shape Dental System™, para la identificación de interferencias oclusales en los movimientos excéntricos. Se utilizó una muestra probabilística de 50 pacientes adultos, mayores de 20 años, Clase-Angle-I o II, con soporte dental anterior y posterior, sin patologías articulares. Como método estándar se utilizó el análisis oclusal (presencia y ubicación de interferencias oclusales durante los diferentes movimientos mandibulares) realizado por dos examinadores cualificados -tanto en los pacientes como en los montajes en el articulador semiajustable Whip Mix serie 2240. Para determinar la exactitud se compararon las mediciones realizados por el método estándar y por el articulador virtual sobre 50 montajes de los 50 pacientes, y para evaluar la precisión se compararon tres mediciones realizadas a intervalos de 7 días por el articulador virtual sobre 35 montajes codificados a ciego para cada medición. En el análisis estadístico se calculó el coeficiente correlación intraclase. La exactitud del articulador virtual reportó fuerza de concordancia moderada para la localización de interferencias en lateralidad izquierda/balanza y protrusión derecha. Y la fuerza de concordancia regular en lateralidad derecha/trabajo, lateralidad izquierda trabajo y balanza, y protrusión izquierda. Se obtuvo una precisión muy buena en todos los casos. Concluyendo que el articulador virtual evaluado no es una prueba confiable para identificar interferencias oclusales en movimientos excéntricos.Los autores agradecen la financiación del estudio a la Vicerrectoría de Investigaciones de la Universidad El Bosque (PCI: 2013-395) y la cooperación prestada por las Clínica Odontológicas de la Universidad El Bosque