Results 41 to 50 of about 76,591 (300)

Lag, lock, sync, slip: the many "phases" of coupled flagella [PDF]

J. R. Soc. Interface. 2014 11 20131160, 2013
In a multitude of life's processes, cilia and flagella are found indispensable. Recently, the biflagellated chlorophyte alga Chlamydomonas has become a model organism for the study of ciliary coordination and synchronization. Here, we use high-speed imaging of single pipette-held cells to quantify the rich dynamics exhibited by their flagella ...
arxiv   +1 more source

Isolation of the Buchnera aphidicola flagellum basal body complexes from the Buchnera membrane.

PLoS ONE, 2021
Buchnera aphidicola is an intracellular bacterial symbiont of aphids and maintains a small genome of only 600 kbps. Buchnera is thought to maintain only genes relevant to the symbiosis with its aphid host.
Matthew J Schepers, James N Yelland, Nancy A Moran, David W Taylor   +3 more
doaj   +1 more source

Mutations in CFAP43 and CFAP44 cause male infertility and flagellum defects in Trypanosoma and human

Nature Communications, 2018
Spermatogenesis defects concern millions of men worldwide, yet the vast majority remains undiagnosed. Here we report men with primary infertility due to multiple morphological abnormalities of the sperm flagella with severe disorganization of the sperm ...
C. Coutton, Alexandra S. Vargas, Amir Amiri-Yekta, Z. Kherraf, Selima Fourati Ben Mustapha, Pauline Le Tanno, Clémentine Wambergue-Legrand, Thomas Karaouzene, G. Martinez, S. Crouzy, Abbas Daneshipour, S. Hosseini, V. Mitchell, L. Halouani, Ouafi Marrakchi, Mounir Makni, H. Latrous, M. Kharouf, J. Deleuze, A. Boland, S. Hennebicq, V. Satre, P. Jouk, Nicolas Thierry-Mieg, B. Conne, D. Dacheux, N. Landrein, A. Schmitt, L. Stouvenel, P. Lorès, Elma El Khouri, S. Bottari, J. Fauré, J. Wolf, K. Pernet-Gallay, J. Escoffier, H. Gourabi, D. Robinson, S. Nef, E. Dulioust, R. Zouari, M. Bonhivers, A. Touré, C. Arnoult, P. Ray   +44 more
semanticscholar   +1 more source

The Drosophila orthologue of the primary ciliary dyskinesia-associated gene, DNAAF3, is required for axonemal dynein assembly

Biology Open, 2021
Ciliary motility is powered by a suite of highly conserved axoneme-specific dynein motor complexes. In humans, the impairment of these motors through mutation results in the disease primary ciliary dyskinesia (PCD).
Petra zur Lage, Zhiyan Xi, Jennifer Lennon, Iain Hunter, Wai Kit Chan, Alfonso Bolado Carrancio, Alex von Kriegsheim, Andrew P. Jarman   +7 more
doaj   +1 more source

Emergent three-dimensional sperm motility: Coupling calcium dynamics and preferred curvature in a Kirchhoff rod model [PDF]

Mathematical Medicine and Biology: A Journal of the IMA, dqy015, 16 October 2018, 2018
Changes in calcium concentration along the sperm flagellum regulate sperm motility and hyperactivation, characterized by an increased flagellar bend amplitude and beat asymmetry, enabling the sperm to reach and penetrate the ovum (egg). The signaling pathways by which calcium increases within the flagellum are well established.
arxiv   +1 more source

Propulsion of microorganisms by a helical flagellum [PDF]

Proceedings of the National Academy of Sciences, 2013
The swimming of a bacterium or a biomimetic nanobot driven by a rotating helical flagellum is often interpreted using the resistive force theory developed by Gray and Hancock and by Lighthill, but this theory has not been tested for a range of physically relevant parameters.
Bin Liu, Hepeng Zhang, Chih-Hung Chen, Bruce Rodenborn, Harry L. Swinney   +4 more
openaire   +3 more sources

The GTPase IFT27 is involved in both anterograde and retrograde intraflagellar transport

eLife, 2014
The construction of cilia and flagella depends on intraflagellar transport (IFT), the bidirectional movement of two protein complexes (IFT-A and IFT-B) driven by specific kinesin and dynein motors.
Diego Huet, Thierry Blisnick, Sylvie Perrot, Philippe Bastin   +3 more
doaj   +1 more source

Propulsion Mechanism of Flexible Microbead Swimmers in the Low Reynolds Number Regime

Micromachines, 2020
A propulsion mechanism for a flexible microswimmer constructed from superparamagnetic microbeads with different diameters and subjected to an oscillating field was studied experimentally and theoretically herein. Various types of artificial swimmers with
Yan-Hom Li, Shao-Chun Chen
doaj   +1 more source

Genetic causes of male infertility: snapshot on morphological abnormalities of the sperm flagellum

Basic and Clinical Andrology, 2019
Male infertility due to Multiple Morphological Abnormalities of the sperm Flagella (MMAF), is characterized by nearly total asthenozoospermia due to the presence of a mosaic of sperm flagellar anomalies, which corresponds to short, angulated, absent ...
Jean-Fabrice Nsota Mbango, C. Coutton, C. Arnoult, P. Ray, A. Touré   +4 more
semanticscholar   +1 more source

Computational Study of Micropropulsion Mechanism in Water Modeled on Flagellum with Projecting Mastigonemes

Journal of Biomechanical Science and Engineering, 2009
The application of dynamics in organisms to the field of engineering is very instructive. From this point of view, we aimed at examining the micropropulsion mechanism modeled on aquatic microorganisms, and proposed a micropropulsion mechanism modeled on ...
Shunichi KOBAYASHI, Ryosuke WATANABE, Tetsuya OIWA, Hirohisa MORIKAWA   +3 more
doaj   +1 more source