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Structural diversity of axonemes across mammalian motile cilia.
Nature
January 2025
Department of Biochemistry and Molecular Biophysics, Washington University in St. Louis, School of Medicine, St. Louis, MO, USA.
Reproduction, development and homeostasis depend on motile cilia, whose rhythmic beating is powered by a microtubule-based molecular machine called the axoneme. Although an atomic model of the axoneme is available for the alga Chlamydomonas reinhardtii, structures of mammalian axonemes are incomplete. Furthermore, we do not fully understand how molecular structures of axonemes vary across motile-ciliated cell types in the body.
View Article and Find Full Text PDFAir Storage Impact on Surface Evolution of Stoichiometric and Li-Rich NMC811.
ACS Omega
December 2024
Faculty of Chemistry, University of Warsaw, Pasteura 1, 02-093 Warsaw, Poland.
In recent years, a type of layered oxide, LiNi Mn Co O (NMC) where ++ = 1, has become the preferred cathode material for electric vehicle (EV) batteries. Despite some disorder in the crystal structure due to Li/Ni cation mixing, the composition offers a high specific capacity of up to 200 mAh g at 4.3 V vs Li|Li.
View Article and Find Full Text PDFThe Ground State of Multispin Systems Based on Verdazyl and Nitrene Radicals: An EPR and Quantum-Chemical Study.
J Phys Chem A
December 2024
N. D. Zelinsky Institute of Organic Chemistry, Russian Academy of Sciences, Leninsky Ave. 47, Moscow 119991, Russian Federation.
In this study, low-temperature EPR spectroscopy and quantum-chemical techniques were employed to investigate multispin systems─1,5-diphenyl-3-(3-nitrenophenyl)-6-oxoverdazyl and 1,5-diphenyl-3-(4-nitrenophenyl)-6-oxoverdazyl─that contain a nitrene center at either a - or -position, respectively. Ground states and magnetic zero-field splitting (ZFS) parameters of these multispin systems were determined by experimental and computational methods. The results indicated that the high-spin quartet state is a ground state, and the quartet-doublet energy gap is close to 10 kcal/mol for the -position of the nitrene group, with ZFS parameters = 0.
View Article and Find Full Text PDFOogenesis involves a novel nuclear envelop remodeling mechanism in Schmidtea mediterranea.
Dev Biol
December 2024
Stowers Institute for Medical Research, Kansas City, MO, 64110, USA; Howard Hughes Medical Institute, Stowers Institute for Medical Research, Kansas City, MO, 64110, USA. Electronic address:
The cell nuclei of Ophisthokonts, the eukaryotic supergroup defined by fungi and metazoans, is remarkable in the constancy of their double-membraned structure in both somatic and germ cells. Such remarkable structural conservation underscores common and ancient evolutionary origins. Yet, the dynamics of disassembly and reassembly displayed by Ophisthokont nuclei vary extensively.
View Article and Find Full Text PDFDifferential effects of stimulation waveform and intensity on the neural structures activated by lumbar transcutaneous spinal cord stimulation.
J Neurophysiol
December 2024
Spinal Cord Injury Research Centre, Neuroscience Research Australia, Randwick, 2031 NSW, Australia.
Introduction: Lumbar transcutaneous spinal cord stimulation (TSS) evokes synchronized muscle responses, termed spinally evoked motor response (sEMR). Whether the structures TSS activates to evoke sEMRs differ when TSS intensity and waveform are varied is unknown.
Methods: In 15 participants (9F:6M), sEMRs were evoked by TSS over L1-L3 (at sEMR threshold and suprathreshold intensities) using conventional (one 400-µs biphasic pulse) or high-frequency burst (ten 40-µs biphasic pulses at 10 kHz) stimulus waveforms in vastus medialis (VM), tibialis anterior (TA) and medial gastrocnemius (MG) muscles.
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