A Rent in the Left Ventricle: A Sea-Saw Between Life and Death.

Penetrating injuries to the precordium are life-threatening and require early detection and immediate intervention. We present a case of penetrating cardiac injury who presented with a definitive airway and hemodynamically unstable. During the primary survey, the patient had a cardiac arrest with pulseless ventricular tachycardia.

No evidence of canopy-scale leaf thermoregulation to cool leaves below air temperature across a range of forest ecosystems.

Understanding and predicting the relationship between leaf temperature () and air temperature () is essential for projecting responses to a warming climate, as studies suggest that many forests are near thermal thresholds for carbon uptake. Based on leaf measurements, the limited leaf homeothermy hypothesis argues that daytime is maintained near photosynthetic temperature optima and below damaging temperature thresholds. Specifically, leaves should cool below at higher temperatures (i.

Imaging canopy temperature: shedding (thermal) light on ecosystem processes.

Canopy temperature T is a key driver of plant function that emerges as a result of interacting biotic and abiotic processes and properties. However, understanding controls on T and forecasting canopy responses to weather extremes and climate change are difficult due to sparse measurements of T at appropriate spatial and temporal scales. Burgeoning observations of T from thermal cameras enable evaluation of energy budget theory and better understanding of how environmental controls, leaf traits and canopy structure influence temperature patterns.