Isotropic rotation in amphidynamic crystals of stacked carbazole-based rotors featuring halogen-bonded stators.

Liquid-like dynamics of a covalent 1,4-phenylene rotator have been unveiled in 1 with a brominated stator showing type-II halogen bonds. This singular rotation is favored by synergistic molecular changes in stacked molecules, according to VT solid state NMR, 1H T1 relaxometry and VT X-ray experiments of this highly crystalline compound.

Influencia del color de fondo y el tipo de lente en la toma de fotografía extraoral / Influencia del color de fondo y el tipo de lente en la toma de fotografía extraoral

Disponer de evidencias médicas basadas en fotografías clínicas extraorales de alta calidad, esuna labor que necesita destreza, conocimiento de la técnica y un entorno adecuado. Hoy endía muchos odontólogos capturan imágenes de forma no estandarizada, y con gran desconocimientosobre el tema.

Ejecución de un sistema piloto de tele-radiología en Medellín, Colombia / Implementing a teleradiology pilot system in Medellín, Colombia

Objetivo: Aplicar un sistema piloto de tele-radiología en la ciudad de Medellín con software de acceso remoto que permita la comunicación e interpretación a distancia de imágenes biomédicas. Materiales y métodos: Se utilizaron imágenes de estudios de resonancia magnética y tomografía computadorizada almacenados en formato DICOM. Los datos se transmitieron en una red punto a punto mediante líneas de red digital de servicios integrados (RDSI) entre dos centros de diagnóstico radiológico. El sistema se llevó a cabo bajo arquitectura PC basada en Intel x86 con sistema operativo Windows® 2000. Resultados: Para la lectura y visualización local de imágenes almacenadas en formato DICOM, se desarrolló una aplicación en Java con funciones que permiten su manipulación y la opción de exportar a otros formatos como JPEG, TIFF y BMP. Conclusiones: El sistema permitió en modalidades como tomografía computadorizada (TC) e imagen por resonancia magnética (RM) un diagnóstico e interpretación remota clínicamente confiables, con tiempos de respuesta aceptables para las necesidades y modo de actuar reales de los centros radiológicos participantes.

Objective: To implement a teleradiology pilot system in Medellín city using software for remote access, this allows the communication and interpretation of biomedical images at distance. Materials and methods: Images from different magnetic resonance and computed tomography studies stored in DICOM format were used. Data were transmitted in a point-to-point network using an integrated services digital network (ISDN) line between two radiological diagnostic centers. The system was developed under PC Intel’s x86 architecture, with Windows® 2000 as the operating system. Results: In order to read and visualize images stored in DICOM format, a Java application with functions that allow their manipulation and the option to export them to other formats such as JPEG, TIFF and BMP was developed. Conclusion: The system allows a clinically reliable diagnostic and remote interpretation for modalities such as computed tomography (CT) and magnetic resonance (MR) images, with acceptable response times.

Prevalence and risk factors of hypercholesterolemia among Thai men and women receiving health examinations.

The purpose of our study was to evaluate risk factors for hypercholesterolemia and correlates of serum lipid concentrations in Thai men and women. A cross-sectional study was conducted in 1392 patients (380 men and 1012 women) who received health examinations during July 1999 - February 2000 at King Chulalongkorn Memorial Hospital, Bangkok, Thailand. Serum total cholesterol (TC), triglyceride (TG) and high density lipoprotein- cholesterol (HDL-C) concentrations were determined using standard procedures. Logistic and linear regression procedures were used to assess the association of several covariates with risk for hypercholesterolemia. The results reveal that the prevalences of hypercholesterolemia (TC > or =200 mg/dl) among men and women were 66.8% and 66.0%, respectively. Among men, hypercholesterolemia was associated with older adults (OR = 3.26), and previous alcohol consumption (OR = 2.05). Risk factors for women included advanced age (OR = 3.19), and a family history of dyslipidemia (OR = 1.59). Serum TC and TG were positively associated with age and previous alcohol consumption among men. Among women, TC and TG were strongly associated with age, body mass index (BMI) and family history of dyslipidemia. In men and women, HDL-C was inversely associated with BMI. More emphasis should be placed on understanding the epidemiology of hypercholesterolemia and other dyslipidemias in Thai men and women. More information regarding risk factors will aid in the development of effective health promotion and disease prevention efforts.