Ultraviolet Excitation of M-O (M = Phenalenone, Fluorenone, Pyridine, & Acridine) Complexes Resulting in O.

In our experiment, a trace amount of an organic molecule (M = 1-phenalen-1-one, 9-fluorenone, pyridine, or acridine) was seeded into a gas mix consisting of 3% O with a rare gas buffer (He or Ar) and then supersonically expanded. We excited the resulting molecular beam with ultraviolet light at either 355 nm (1-phenalen-1-one, 9-fluorenone, or acridine) or 266 nm (pyridine) and used resonance enhanced multiphoton ionization (REMPI) spectroscopy to probe for the formation of O in the a-Δ state, O. For all systems, the REMPI spectra demonstrate that ultraviolet excitation results in the formation of O and the oxygen product is confirmed to be in the ground vibrational state and with an effective rotational temperature below 80 K.

Feasibility and Challenges of Transcatheter Edge-to-Edge Repair for Very Large Tricuspid Valve Gaps.

Massive and torrential tricuspid regurgitation may be accompanied by very large gaps, posing a challenge for transcatheter edge-to-edge repair (TEER). These 2 cases involve patients who underwent successful TEER despite very large gaps. Both patients experienced significant improvement after TEER.

Cerebellar Inputs in the American Alligator (Alligator mississippiensis).

Crocodilians (alligators, crocodiles, and gharials) are the closet living relatives to birds and, as such, represent a key clade to understand the evolution of the avian brain. However, many aspects of crocodilian neurobiology remain unknown. In this paper, we address an important knowledge gap as there are no published studies of cerebellar connections in any crocodilian species.

Two Types of Auditory Spatial Receptive Fields in Different Parts of the Chicken's Midbrain.

The optic tectum (OT) is an avian midbrain structure involved in the integration of visual and auditory stimuli. Studies in the barn owl, an auditory specialist, have shown that spatial auditory information is topographically represented in the OT. Little is known about how auditory space is represented in the midbrain of birds with generalist hearing, i.