Hotspots of biogeochemical activity linked to aridity and plant traits across global drylands.

Perennial plants create productive and biodiverse hotspots, known as fertile islands, beneath their canopies. These hotspots largely determine the structure and functioning of drylands worldwide. Despite their ubiquity, the factors controlling fertile islands under conditions of contrasting grazing by livestock, the most prevalent land use in drylands, remain virtually unknown.

[Pheochromocytoma associated with von Recklinghausen neurofibromatosis].

A pheochromocytoma is an adrenal gland tumor that secretes epinephrine and norepinephrine hormones, and is responsible for regulating heart rate and blood pressure, among other functions. The condition can occur alone or in combination with other disorders, and genetic and environmental factors play a key role. Neurofibromatosis-1 (NF-1) an inherited "autosomal dominant" disorder is one of the most common genetic disorders, characterized by formation of neurofibromas (tumors involving nerve tissue) in the skin, subcutaneous tissue, cranial and spinal root nerves.