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Hourglass-like constriction is a hallmark of neuralgic amyotrophy (Parsonage-Turner syndrome).
Hand Surg Rehabil
January 2025
Neurology Department, CHU de Bicêtre, AP-HP, Le-Kremlin-Bicêtre, France; French National Reference Center for Rare Neuropathies, Le-Kremlin-Bicêtre, France.
Hourglass Constriction of a Single Fascicle of the Anterior Interosseous Nerve: A Case Report.
Ann Plast Surg
February 2025
From the Department of Plastic, Hand and Faciomaxillary Surgery, The Alfred, Melbourne, Australia.
Hourglass fascicular constrictions have been reported in fewer than 100 cases globally and only in the upper limb. The etiology remains unknown. Patients often present with self-limiting pain in the affected limb followed by flaccid paralysis.
View Article and Find Full Text PDFMultiplexed transcriptomic analyzes of the plant embryonic hourglass.
Nat Commun
January 2025
School of Integrative Plant Science, Plant Biology Section, Cornell University, Ithaca, NY, USA.
Zoologists have adduced morphological convergence among embryonic stages of closely related taxa, which has been called the phylotypic stage of embryogenesis. Transcriptomic analyzes reveal an hourglass pattern of gene expression during plant and animal embryogenesis, characterized by the accumulation of evolutionarily older and conserved transcripts during mid-embryogenesis, whereas younger less-conserved transcripts predominate at earlier and later embryonic stages. In contrast, comparisons of embryonic gene expression among different animal phyla describe an inverse hourglass pattern, where expression is correlated during early and late stages but not during mid-embryo development.
View Article and Find Full Text PDFManuscript Writing for Dummies: Like Sands Through the Hourglass.
J Appl Physiol (1985)
January 2025
Senior Consulting Editor, Journal of Applied Physiology.
Geometrically modulated contact forces enable hula hoop levitation.
Proc Natl Acad Sci U S A
January 2025
Applied Mathematics Laboratory, Courant Institute of Mathematical Sciences, Department of Mathematics, New York University, New York, NY 10012.
Mechanical systems with moving points of contact-including rolling, sliding, and impacts-are common in engineering applications and everyday experiences. The challenges in analyzing such systems are compounded when an object dynamically explores the complex surface shape of a moving structure, as arises in familiar but poorly understood contexts such as hula hooping. We study this activity as a unique form of mechanical levitation against gravity and identify the conditions required for the stable suspension of an object rolling around a gyrating body.
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