Síndrome de Hamman como complicación inusual de COVID-19 / Hamman syndrome as an unusual complication of covid-19

La enfermedad por SARS-CoV-2 ha sido bien conocida por su capacidad de infección y afectación multiórgano con cierta preferencia y gravedad a los pulmones incluyendo lesiones parenquimatosas, alveolares e intersticiales. En esta oportunidad se presenta un caso infrecuente como lo es el síndrome de Hamman en un paciente masculino de 35 años con neumonía viral por COVID-19, Entidad que podría ser un indicador potencial de progresión y agravante de la enfermedad como de los síntomas asociados al patrón usual de la infección. Su tratamiento lo definirá la estabilidad clínica y el tamaño del neumomediastino (AU)

SARS-CoV-2 disease has been well known for its capacity for infection and multi-organ involvement with some preference and severity to the lungs including parenchymal, alveolar and interstitial lesions. On this occasion, an infrequent case such as Hamman syndrome is presented in a 35-year-old male patient with viral pneumonia due to COVID-19. Entity that could be a potential indicator of progression and aggravation of the disease as well as the symptoms associated with the pattern usual infection. His treatment will define the clinical stability and size of the pneumomediastinum (AU)

The role and implications of bassanite as a stable precursor phase to gypsum precipitation.

Calcium sulfate minerals such as gypsum play important roles in natural and industrial processes, but their precipitation mechanisms remain largely unexplored. We used time-resolved sample quenching and high-resolution microscopy to demonstrate that gypsum forms via a three-stage process: (i) homogeneous precipitation of nanocrystalline hemihydrate bassanite below its predicted solubility, (ii) self-assembly of bassanite into elongated aggregates co-oriented along their c axis, and (iii) transformation into dihydrate gypsum. These findings indicate that a stable nanocrystalline precursor phase can form below its bulk solubility and that in the CaSO(4) system, the self-assembly of nanoparticles plays a crucial role. Understanding why bassanite forms prior to gypsum can lead to more efficient anti-scaling strategies for water desalination and may help to explain the persistence of CaSO(4) phases in regions of low water activity on Mars.