Measuring Heart Rate Variability Using Facial Video.

Heart Rate Variability (HRV) has become an important risk assessment tool when diagnosing illnesses related to heart health. HRV is typically measured with an electrocardiogram; however, there are multiple studies that use Photoplethysmography (PPG) instead. Measuring HRV with video is beneficial as a non-invasive, hands-free alternative and represents a more accessible approach. We developed a methodology to extract HRV from video based on face detection algorithms and color augmentation. We applied this methodology to 45 samples. Signals obtained from PPG and video recorded an average mean error of less than 1 bpm when measuring the heart rate of all subjects. Furthermore, utilizing PPG and video, we computed 61 variables related to HRV. We compared each of them with three correlation metrics (i.e., Kendall, Pearson, and Spearman), adjusting them for multiple comparisons with the Benjamini-Hochberg method to control the false discovery rate and to retrieve the q-value when considering statistical significance lower than 0.5. Using these methods, we found significant correlations for 38 variables (e.g., Heart Rate, 0.991; Mean NN Interval, 0.990; and NN Interval Count, 0.955) using time-domain, frequency-domain, and non-linear methods.

Printing Porous Carbon Aerogels for Low Temperature Supercapacitors.

Maintaining fast charging capability at low temperatures represents a significant challenge for supercapacitors. The performance of conventional porous carbon electrodes often deteriorates quickly with the decrease of temperature due to sluggish ion and charge transport. Here we fabricate a 3D-printed multiscale porous carbon aerogel (3D-MCA) via a unique combination of chemical methods and the direct ink writing technique. 3D-MCA has an open porous structure with a large surface area of ∼1750 m2 g-1. At -70 °C, the symmetric device achieves outstanding capacitance of 148.6 F g-1 at 5 mV s-1. Significantly, it retains a capacitance of 71.4 F g-1 at a high scan rate of 200 mV s-1, which is 6.5 times higher than the non-3D printed MCA. These values rank among the best results reported for low temperature supercapacitors. These impressive results highlight the essential role of open porous structures for preserving capacitive performance at ultralow temperatures.

Efficient Agrobacterium-mediated Transformation of The Elite-Indica Rice Variety Komboka.

Genetic transformation is crucial for both investigating gene functions and for engineering of crops to introduce new traits. Rice (Oryza sativa L.) is an important model in plant research, since it is the staple food for more than half of the world's population. As a result, numerous transformation methods have been developed for both indica and japonica rice. Since breeders continuously develop new rice varieties, transformation protocols have to be adapted for each new variety. Here we provide an optimized transformation protocol with detailed tips and tricks for a new African variety Komboka using immature embryos. In Komboka, we obtained an apparent transformation rate of up to 48% for GUS/GFP reporter gene constructs using this optimized protocol. This protocol is also applicable for use with other elite indica rice varieties.

Características clínicas y patológicas de un coriocarcinoma gástrico primario / Pathologic and clinical characteristic of primary gastric choriocarcinoma

Reportamos un caso de Coriocarcinoma gástrico en un paciente masculino de 74 años quien se presentó con un cuadro clínico de sangramiento gastrointestinal, pérdida de peso y anemia. Los estudios radiológicos y endoscópicos demostraron la presencia de una lesión neoplásica en antro distal. El estudio histológico reveló una lesión neoplásica con un patrón coriocarcinomatoso, lo cual se comprobó mediante la determinación inmunohistoquímica de anticuerpos contra la Sub-unidad B de hormona gonadotrofina corionica (HGC)

Enfermedad de Crohn en un indígena venezolano: reporte de un caso / Crohn's disease in a venezuelan Amazon indian: a case report

Diversos estudios epidemiológicos de la Enfermedad de Crohn revelan un incremento mundial tanto en la incidencia como en la prevalencia en los últimos 50 años. En Latinoamérica la incidencia de casos es mucho menor que en Europa o los Estados Unidos. Se presenta un paciente masculino de 71 años de edad perteneciente a la etnia indígena Baré, del Amazonas Venezolano, el cual fue intervenido quirúrgicamente de emergencia por presentar un cuadro de obstrucción intestinal como primera manifestación de una enfermedad de Crohn

Adenocarcinoma de corteza adrenal. Diagnóstico de autopsia / Adenocarcinoma of adrenal cortex: autopsy diagnosis

El cáncer adreno-cortical, es un tumor de mal pronóstico, altamente agresivo y de baja incidencia. Se requiere de un equipo multidisciplinario para el diagnóstico y manejo de dicha entidad. Reportamos un caso de Adenocarcinoma de la corteza suprarrenal cuyo diagnóstico se hizo a través de autopsia