Disruption of an ant-plant mutualism shapes interactions between lions and their primary prey.

Mutualisms often define ecosystems, but they are susceptible to human activities. Combining experiments, animal tracking, and mortality investigations, we show that the invasive big-headed ant () makes lions () less effective at killing their primary prey, plains zebra (). Big-headed ants disrupted the mutualism between native ants ( spp.

Demographic consequences of mutualism disruption: Browsing and big-headed ant invasion drive acacia population declines.

Across the globe, biological invasions have disrupted mutualisms, producing reverberating consequences for ecosystems. Although invasive species frequently trigger mutualism disruptions, few studies have quantified the demographic mechanisms by which mutualism breakdown may generate population effects. In a Kenyan savanna, the invasive big-headed ant (Pheidole megacephala) has disrupted a foundational mutualism between the monodominant whistling-thorn tree (Acacia drepanolobium) and native ants (Crematogaster spp.

Virtual multispecialty point-of-care ultrasound rotation for fourth-year medical students during COVID-19: Innovative teaching techniques improve ultrasound knowledge and image interpretation.

Objectives: Point-of-care ultrasound (PoCUS) has been integrated into undergraduate medical education. The COVID-19 pandemic forced medical schools to evolve clinical rotations to minimize interruption through implementation of novel remote learning courses. To address the students' need for remote clinical education, we created a virtual PoCUS course for our fourth-year class.

Critical COVID-19 Complicating Recovery From Surgical Repair of Congenital Heart Disease.

This case highlights the need for accurate and rapid testing for severe acute respiratory syndrome coronavirus 2 and also underscores the need for caregivers to remain vigilant for coronavirus disease 2019 in the postoperative setting despite negative preoperative testing.

Frenemy at the gate: Invasion by Pheidole megacephala facilitates a competitively subordinate plant ant in Kenya.

Biological invasions can lead to the reassembly of communities and understanding and predicting the impacts of exotic species on community structure and functioning are a key challenge in ecology. We investigated the impact of a predatory species of invasive ant, Pheidole megacephala, on the structure and function of a foundational mutualism between Acacia drepanolobium and its associated acacia-ant community in an East African savanna. Invasion by P.

Thoracic duct embolization in kaposiform lymphangiomatosis.

An 11-year-old girl with kaposiform lymphangiomatosis presented with recurrent chylous pericardial effusions that were refractory to pericardial drainage and medical therapy. Magnetic resonance imaging demonstrated a prominent lymphatic duct with anterior mediastinal extension into the left clavicular region and a region of high signal that was favored to represent a low-flow lymphatic malformation. The patient underwent direct access thoracic duct lymphangiography with thoracic duct embolization and sclerotherapy of the large left-sided neck and pericardial lymphatic malformation.

Histopathological abnormalities in the central arteries and veins of Fontan subjects.

Objective: Fontan circulations have obligatory venous hypertension, depressed cardiac output and abnormal arterial elastance. Ventriculovascular coupling is known to be abnormal, but the underlying mechanisms are poorly defined. We aim to describe the histopathological features of vascular remodelling encountered in the central arteries and veins in the Fontan circulation as a possible underlying pathological representation of abnormal ventriculovascular coupling.

Natural history of aortic root dilation through young adulthood in a hypermobile Ehlers-Danlos syndrome cohort.

Hypermobile Ehlers-Danlos syndrome (hEDS) is a common inherited connective tissue disorder characterized by joint hypermobility. The natural history of aortic root dilation (AoD), a potential complication of EDS, has not been well characterized in this population. We describe the natural history of aortic root size in a large cohort of patients with hEDS.

Impact of barcode medication administration technology on how nurses spend their time on clinical care.

In a time-motion study conducted in a hospital that recently implemented barcode medication administration (BCMA) technology, we found that the BCMA system did not increase the amount of time nurses spend on medication administration activities, and did not compromise the amount of time nurses spent on direct care of patients. Our results should allay concerns regarding the impact of BCMA on nursing workflow.