Results 91 to 100 of about 76,591 (300)
The Periplasmic Flagellum of Spirochetes
Microbial Physiology, 2004 Although spirochete periplasmic flagella have many features similar to typical bacterial flagella, they are unique in their structure and internal periplasmic location. This location provides advantages for pathogenic spirochetes to enter and to adapt in the appropriate host, and to penetrate through matrices that inhibit the motility of most other ...
openaire +3 more sources
Direction of flagellum beat propagation is controlled by proximal/distal outer dynein arm asymmetry
Proceedings of the National Academy of Sciences of the United States of America, 2018 Significance The motile flagellum/cilium is found across eukaryotic life, and it performs critical functions in many organisms including humans. A fundamental requirement for a motile flagellum is that it must undergo the appropriate waveform for its ...
Beatrice Freya Lucy Edwards +5 more
semanticscholar +1 more source
TULP2 deletion mice exhibit abnormal outer dense fiber structure and male infertility
Reproductive Medicine and Biology, 2022 Purpose Tulp2 (tubby‐like protein 2) is a member of the tubby protein family and expressed predominantly in mouse testis. Recently, it was reported that Tulp2 knockout (KO) mice exhibited disrupted sperm tail morphology; however, it remains to be ...
Yuki Oyama +5 more
doaj +1 more source
Scanning Electron Microscopy of the Rainbow Trout (Salmo gairdneri Richardson) Spermatozoon [PDF]
, 1976 The scanning electron microscope was used to determine the morphology of the rainbow trout (Salmo gairdneri Richardson) spermatozoon. The spermatozoon is approximately 32 μm long and consists of a head, mitochondrial collar, and flagellum.
Fribourgh, James H., Soloff, Bernard L.
core +2 more sources
Frontiers in Microbiology, 2016 Bacterial cells can display different types of motility, due to the presence of external appendages such as flagella and type IV pili. To date, little information on the mechanisms involved in the motility of the Lysobacter species has been available ...
Selena Tomada +5 more
doaj +1 more source
Modelling Motility: The Mathematics of Spermatozoa
Frontiers in Cell and Developmental Biology, 2021 In one of the first examples of how mechanics can inform axonemal mechanism, Machin's study in the 1950s highlighted that observations of sperm motility cannot be explained by molecular motors in the cell membrane, but would instead require motors ...
Eamonn A. Gaffney +2 more
doaj +1 more source
Comparative hydrodynamics of bacterial polymorphism [PDF]
Phys. Rev. Lett. (2011) 106, 058103, 2011 Most bacteria swim through fluids by rotating helical flagella which can take one of twelve distinct polymorphic shapes. The most common helical waveform is the "normal" form, used during forward swimming runs. To shed light on the prevalence of the normal form in locomotion, we gather all available experimental measurements of the various polymorphic ...
arxiv +1 more source
Flagellum couples cell shape to motility in Trypanosoma brucei
Proceedings of the National Academy of Sciences of the United States of America, 2018 Significance Trypanosoma brucei is a highly invasive pathogen capable of penetrating deeply into host tissues. To understand how flagellar motility facilitates cell penetration, we used cryo-electron tomography (cryo-ET) to visualize two genetically ...
Stella Y. Sun +10 more
semanticscholar +1 more source
Sperm competition and sperm midpiece size: no consistent pattern in passerine birds [PDF]
, 2007 Sperm competition is thought to be a major force driving the evolution of sperm shape and function. However, previous studies investigating the relationship between the risk of sperm competition and sperm morphometry revealed inconclusive results and ...
Birkhead T.R +3 more
core +2 more sources
The Vibrio H-Ring Facilitates the Outer Membrane Penetration of the Polar Sheathed Flagellum
bioRxiv, 2018 Flagellum is the major organelle for motility in many bacterial species. While most bacteria possess external flagella, such as the multiple peritrichous flagella found in Escherichia coli and Salmonella enterica or the single polar sheathed flagellum in
Shiwei Zhu +4 more
semanticscholar +1 more source