Results 11 to 20 of about 76,591 (300)

Shape of optimal active flagella [PDF]

Journal of Fluid Mechanics, 730, R1, 2013
Many eukaryotic cells use the active waving motion of flexible flagella to self-propel in viscous fluids. However, the criteria governing the selection of particular flagellar waveforms among all possible shapes has proved elusive so far. To address this question, we derive computationally the optimal shape of an internally-forced periodic planar ...
Eloy, Christophe, Lauga, Eric
arxiv   +5 more sources

Giant FAZ10 is required for flagellum attachment zone stabilization and furrow positioning in Trypanosoma brucei [PDF]

Journal of Cell Science, 2017
The flagellum and flagellum attachment zone (FAZ) are important cytoskeletal structures in trypanosomatids, being required for motility, cell division and cell morphogenesis.
Bernardo P. Moreira, C. K. Fonseca, T. Hammarton, M. Baqui   +3 more
semanticscholar   +3 more sources

Dynamics of a bacterial flagellum under reverse rotation [PDF]

arXiv, 2016
To initiate tumbling of an E. coli, one of the helical flagella reverses its sense of rotation. It then transforms from its normal form first to the transient semicoiled state and subsequently to the curly-I state. The dynamics of polymorphism is effectively modeled by describing flagellar elasticity through an extended Kirchhoff free energy.
Adhyapak, Tapan Chandra, Stark, Holger
arxiv   +5 more sources

Flagellum-deficient Pseudomonas aeruginosa is more virulent than non-motile but flagellated mutants in a cystic fibrosis mouse model [PDF]

Microbiology Spectrum
Loss of the flagellum marks the pathoadaptation of Pseudomonas aeruginosa to the cystic fibrosis (CF) airway environment during lung disease. Losing the flagellum is advantageous to the bacterium as the flagellum can be recognized by immune cells.
Dina A. Moustafa, Kayla M. Fantone, Samantha L. Tucker, Nael A. McCarty, Arlene A. Stecenko, Joanna B. Goldberg, Balázs Rada   +6 more
doaj   +2 more sources

Force-extension curves of bacterial flagella [PDF]

, 2010
Bacterial flagella assume different helical shapes during the tumbling phase of a bacterium but also in response to varying environmental conditions. Force-extension measurements by Darnton and Berg explicitly demonstrate a transformation from the coiled to the normal helical state [N.C. Darnton and H.C. Berg, Biophys. J. {92}, 2230 (2007)].
Stark, Holger, Vogel, Reinhard
arxiv   +3 more sources

CCDC113 stabilizes sperm axoneme and head-tail coupling apparatus to ensure male fertility [PDF]

eLife
The structural integrity of the sperm is crucial for male fertility, defects in sperm head-tail linkage and flagellar axoneme are associated with acephalic spermatozoa syndrome (ASS) and the multiple morphological abnormalities of the sperm flagella ...
Bingbing Wu, Chenghong Long, Yuzhuo Yang, Zhe Zhang, Shuang Ma, Yanjie Ma, Huafang Wei, Jinghe Li, Hui Jiang, Wei Li, Chao Liu   +10 more
doaj   +2 more sources

Basal body positioning is controlled by flagellum formation in Trypanosoma brucei. [PDF]

PLoS ONE, 2007
To perform their multiple functions, cilia and flagella are precisely positioned at the cell surface by mechanisms that remain poorly understood. The protist Trypanosoma brucei possesses a single flagellum that adheres to the cell body where a specific ...
Sabrina Absalon, Linda Kohl, Carole Branche, Thierry Blisnick, Géraldine Toutirais, Filippo Rusconi, Jacky Cosson, Mélanie Bonhivers, Derrick Robinson, Philippe Bastin   +9 more
doaj   +1 more source

Eversion and withdrawal of an intromittent organ before sexual maturation prepares male beetles for copulation [PDF]

Royal Society Open Science, 2017
Some species of criocerine beetles have a hyper-elongated part of the intromittent organ called a flagellum. In resting position, the flagellum is stored in a specialized internal sac in the intromittent organ. This specialized state of the flagellum and
Yoko Matsumura, Takuya Kubo
doaj   +1 more source

The trypanosome flagellum [PDF]

Journal of Cell Science, 2003
African Trypanosomes are flagellated protozoan parasites that cause sleeping sickness in humans and Nagana in cattle. During its life cycle, Trypanosoma brucei alternates between an insect vector (tsetse fly) and a mammalian host.
Vaughan, S, Gull, K
openaire   +3 more sources

Dynamic Hybrid Flagellar Motors—Fuel Switch and More

Frontiers in Microbiology, 2022
Flagellar motors are intricate rotating nanomachines that are powered by transmembrane ion gradients. The stator complexes are the powerhouses of the flagellar motor: They convert a transmembrane ion gradient, mainly of H+ or Na+, into rotation of the ...
Kai M. Thormann
doaj   +1 more source