ABSTRACT
We present a study on the excitation of individual vibrational modes with ballistic charge carriers propagating along the Cu(110) surface. By means of the molecular nanoprobe technique, where the reversible switching of a molecule-in this case tautomerization of porphycene-is utilized to detect excitation events, we reveal anisotropic coupling of two distinct vibrational modes to the substrate. The N-H bending mode, excited below |E| ≈ 376 meV, exhibits maxima perpendicular to the rows of the Cu(110) substrate and minima along the rows. In contrast, the N-H stretching mode, excited above |E| ≈ 376 meV, displays maxima along the rows and is constant otherwise. This inversion of the anisotropy reflects the orthogonality between the N-H bending and stretching mode. Additionally, we observe an energy-dependent asymmetry in the propagation direction of charge carriers injected into the Cu(110) surface state. Hereby, the anisotropic band structure results in a correlation between the group velocity and the tunneling probability into electronic states of the substrate.
ABSTRACT
Inspired by the modelization of 2D materials systems, we characterize arrangements of identical nonflat squares in 3D. We prove that the fine geometry of such arrangements is completely characterized in terms of patterns of mutual orientations of the squares and that these patterns are periodic and one-dimensional. In contrast to the flat case, the nonflatness of the tiles gives rise to nontrivial geometries, with configurations bending, wrinkling, or even rolling up in one direction.
ABSTRACT
Paciente de sexo femenino, de 35 años de edad, conocida etilista de 150 g/día de alcohol de larga data, acude por cuadro de 3 días aproximadamente de dolor abdominal difuso al que se agrega anorexia, náuseas y hematemesis en varias oportunidades. Refiere además crecimiento abdominal progresivo de 1 mes de evolución. Ingresa al servicio séptica, se inicia tratamiento antibiótico con ceftriaxona 2 g/día cubriendo foco abdominal (PBE) previa toma de hemocultivo y cultivo de líquido ascítico. A pesar de soporte hemodinámico (inotrópicos) suministrado a la paciente fallece en su segundo día de internación. En los hemocultivos realizados se observaron colonias de bacilos Gram positivos, beta hemolíticas en agar sangre y determinó la presencia de L. monocytogenes. siendo sensible a la penicilina con una CIM de 1 ug/ml.
This was a female patient of 35 years old, long-term known alcoholic consuming 150 g/day of alcohol. She attends the service because of a clinical profile of approximately three days of evolution with diffuse abdominal pain plus anorexia, nauseas and hematemesis in many occasions. She also refers progressive abdominal enlargement of one month of evolution. She is admitted to the service with sepsis. Antibiotics treatment with ceftriaxone 2 g/day is started, covering abdominal focus (SBP) and previous hemoculture collection and ascitic fluid culture. Although hemodynamic support (inotropes) is provided, the patient dies on the second day of hospitalization. In the hemocultures, colonies of Gram positive bacilli were observed, beta hemolytic bacteria in blood agar and presence of L. monocytogenes was determined, being sensitive to penicillin with a MIC of 1 ug/ml.
