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Complementary Peptide Interactions Support the Ultra-Rigidity of Polymers of De Novo Designed Click-Functionalized Bundlemers.
J Phys Chem B
January 2025
Department of Chemistry, University of Pennsylvania, Philadelphia, Pennsylvania 19104, United States.
Computationally designed 29-residue peptides yield tetra-α-helical bundles with symmetry. The "bundlemers" can be bifunctionally linked via thiol-maleimide cross-links at their N-termini, yielding supramolecular polymers with unusually large, micrometer-scale persistence lengths. To provide a molecularly resolved understanding of these systems, all-atom molecular modeling and simulations of linked bundlemers in explicit solvent are presented.
View Article and Find Full Text PDFUnusual cholesterol crystal formation in a rare clinical case report of splenic echinococcal cyst in a patient from Sardinia, Italy.
Front Parasitol
January 2025
World Organisation for Animal Health (WOAH) and National Reference Laboratory for Echinococcosis, Istituto Zooprofilattico della Sardegna, Sassari, Italy.
Cystic echinococcosis (CE) is a zoonotic disease caused by sensu lato, the metacestode of a tapeworm parasite of high medical importance. Infection of the parasite leads to the development of echinococcal cysts, and the spleen is a rarely infected organ. A 46-year-old woman who was born and who resides in Sardinia, Italy, was referred to the Echinococcosis outpatient clinic at the University Hospital of Sassari (Sardinia, Italy) for a pain in the left flank.
View Article and Find Full Text PDFNegative linear compressibility and structural stability of the energetic material -hexanitrostilbene under pressure.
Phys Chem Chem Phys
January 2025
School of Materials and Energy, University of Electronic Science and Technology of China, Chengdu 611731, Sichuan, China.
The structural stability of the energetic material 2,2',4,4',6,6'-hexanitrostilbene (-HNS) under high pressure is critical for optimizing its detonation performance and low sensitivity. However, its structural response to external pressure has not been sufficiently investigated. In this study, high-pressure single-crystal X-ray diffraction data of -HNS demonstrate that the sample exhibits pronounced anisotropic strain, demonstrating an unusual negative linear compressibility (NLC) along the axis, with a coefficient of -4.
View Article and Find Full Text PDFAerial urination suggests undescribed sensory modality and social function in river dolphins.
Behav Processes
January 2025
CetAsia Research Group Ltd., Baysville, Ontario, Canada; Department of Biology, Trent University, Peterborough, Ontario, Canada.
Scent marking through urine spraying is known to aid mate selection, territory marking and chemical communication in terrestrial, but not in aquatic mammals. We quantify an unusual aerial urination behaviour in botos (Inia geoffrensis) and discuss its potential functions. Between 2014 and 2018, we conducted land-based behavioural surveys on wild botos in central Brazil, recording the sequence, duration and social context of aerial urination.
View Article and Find Full Text PDFFlipons and the origin of the genetic code.
Biol Lett
January 2025
Discovery, InsideOutBio , Charlestown, MA, USA.
This paper is focused on the origins of the contemporary genetic code. A novel explanation is proposed for how the mapping of nucleotides in DNA to amino acids in proteins arose that derives from repeat nucleotide sequences able to form alternative nucleic acid structures (ANS), such as the unusual left-handed Z-DNA, triplex, G-quadruplex and I-motif conformations. The scheme identifies sequence-specific contacts that map ANS repeats to dipeptide polymers (DPS).
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