Simulation of the Raman spectra of CO2: bridging the gap between algebraic models and experimental spectra.

The carbon dioxide Raman spectrum is simulated within an algebraic approach based on curvilinear coordinates in a local representation. The two main advantages of the present algebraic approach are a possible connection with configuration space and the correct description of systems with either local or normal mode character. The system Hamiltonian and polarizability tensor are expanded in terms of curvilinear coordinates. The curvilinear coordinates are in turn expanded into normal coordinates, obtaining an algebraic representation in terms of normal bosonic operators. A canonical transformation maps the operators into a local algebraic representation. The final step is an anharmonization procedure to local operators. The Raman spectrum of CO2 has been simulated, obtaining results close to experimental accuracy, and polarizability transition moments for the Raman spectral lines between 1150 cm(-1) and 1500 cm(-1) are reported. The comparison between experimental and simulated spectra has provided six new CO2 experimental vibrational terms.

La biopsia mediante sutura en bolsa de tabaco presuturada en el diagnóstico y tratamiento de los pólipos umbilicales. Réplica / Biopsy by presutured purse-string suture in the diagnosis and treatment of umbilical polyps. Reply

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[Persistence of the omphalomesenteric duct. Childhood differential diagnosis of umbilical granuloma]. / Persistencia del conducto onfalomesentérico. Diagnóstico diferencial de granuloma umbilical en la infancia.

The omphalomesenteric duct is an embryonic structure which communicates the vitelline duct with the midgut. It normally disappears between the fifth and ninth weeks of intrauterine life. Anomalies related with the total or partial absence of this involution are show in 2 % of the population. We report a case of persistence of the omphalomesenteric duct and review the bibliography to establish the differences between this anomaly and umbilical granuloma, which is the main differential diagnosis.

Persistencia del conducto onfalomesentérico. Diagnóstico diferencial de granuloma umbilical en la infancia / Persistence of the omphalomesenteric duct. Childhood differential diagnosis of umbilical granuloma

El conducto onfalomesentérico es una estructura embrionaria que comunica al saco vitelino con el intestino medio que generalmente desaparece entre la quinta y la novena semanas de vida intrauterina. Las anomalías relacionadas con la ausencia total o parcial de dicha involución se presentan en un 2 % de la población. Presentamos un caso de persistencia del conducto onfalomesentérico y realizamos una revisión bibliográfica para establecer las diferencias que existen entre esta anomalía y el granuloma umbilical que es su principal diagnóstico diferencial

The omphalomesenteric duct is an embryonic structure which communicates the vitelline duct with the midgut. It normally disappears between the fifth and ninth weeks of intrauterine life. Anomalies related with the total or partial absence of this involution are show in 2 % of the population. We report a case of persistence of the omphalomesenteric duct and review the bibliography to establish the differences between this anomaly and umbilical granuloma, which is the main differential diagnosis