Rapid metabolism fosters microbial survival in the deep, hot subseafloor biosphere.

A fourth of the global seabed sediment volume is buried at depths where temperatures exceed 80 °C, a previously proposed thermal barrier for life in the subsurface. Here, we demonstrate, utilizing an extensive suite of radiotracer experiments, the prevalence of active methanogenic and sulfate-reducing populations in deeply buried marine sediment from the Nankai Trough subduction zone, heated to extreme temperature (up to ~120 °C). The small microbial community subsisted with high potential cell-specific rates of energy metabolism, which approach the rates of active surface sediments and laboratory cultures. Our discovery is in stark contrast to the extremely low metabolic rates otherwise observed in the deep subseafloor. As cells appear to invest most of their energy to repair thermal cell damage in the hot sediment, they are forced to balance delicately between subsistence near the upper temperature limit for life and a rich supply of substrates and energy from thermally driven reactions of the sedimentary organic matter.

Delayed presentation of acute coronary syndrome: a challenge in its early management.

INTRODUCTION: The time of presentation of acute coronary syndrome from the onset of chest pain determines the treatment modality and prognosis. Delayed presentation is associated with a poor outcome. In the present study, we tried to find out the causes of late presentation of ACS in a tertiary care center in the eastern part of Nepal. METHODS: It was a cross-sectional descriptive study that included 100 consecutive patients with ACS presenting to our institute over a period of 8 months. They were studied for their demographic profile, delay in presentation, the management done at the local centers and their final diagnosis. RESULTS: We found that patients living within Dharan City reached BPKIHS within 20 hours of the onset of chest pain while those from outside the city who came directly reached within 63 hours. Other patients reached their respective local centers (health posts, district hospitals and private clinics) within 39 hours. The commonest cause of delay was vehicular problem followed by unnecessary delay at the local centers. The work up for chest pain was inadequate in these centers. Late presentation to our institute significantly affected the optimal management. CONCLUSIONS: We found that significant number of patients with ACS from eastern Nepal presented late in our tertiary care center. In order to improve ACS outcome in this region, we advise equipping the local centers with electrocardiogram machines, improvement in ambulance services and a greater emphasis on coronary artery disease awareness programs as well as initiating preventive measures.