Search Results 1-20 of 73

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  • Bacterial spinning top

    Ishimoto Kenta

    … These results highlight the rich diversity of bacterial surface motility emerging from mechanical boundary interactions coupled with the cell swimming and hook flexibility. …

    Journal of Fluid Mechanics (880), 620-652, 2019-12-10

    IR 

  • Spiral Trajectory Modulation of Rheotaxic Motile Human Sperm in Cylindrical Microfluidic Channels of Different Inner Diameters

    Nishina Saori , Matsuura Koji , Naruse Keiji

    … Our findings suggest that the oviduct structure affects the swimming properties of sperm cells, guiding them from the uterus to the ampulla for egg fertilization. …

    Acta Medica Okayama 73(3), 213-221, 2019-06

    IR  DOI 

  • Study of bovine sperm motility in shear-thinning viscoelastic fluids

    Hyakutake Toru , Sato Koichi , Sugita Kenta

    … To elucidate the process whereby sperm arrive at an egg in the female reproductive organs, it is essential to investigate how rheological properties of the fluid around mammalian spermatozoa affect their motility. … We examined the motility and flagellar waveform of bovine sperm swimming in a fluid with similar rheological properties as mammalian cervical mucus. … in particular, shear-thinning viscoelastic fluid increased the progressive motility of the sperm. …

    Journal of Biomechanics (88), 130-137, 2019-05-09

    IR 

  • Mechanism of bacterial motility  [in Japanese]

    NAKAMURA Shuichi

    … However, the ability of directional movement, such as swimming by rotating flagella, gliding over surfaces via mobile cell-surface adhesins, and actin-dependent movement, could be useful for thriving through searching more favorable environments, and such motility is known to be related to pathogenicity. … Among diverse migration mechanisms, perhaps flagella-dependent motility would be used by most species. …

    Nippon Saikingaku Zasshi 74(2), 157-165, 2019

    J-STAGE 

  • Enhanced synergistic effects of xylitol and isothiazolones for inhibition of initial biofilm formation by <i>Pseudomonas aeruginosa</i> ATCC 9027 and <i>Staphylococcus aureus</i> ATCC 6538

    Zhou Gang , Peng Hong , Wang Ying-si , Huang Xiao-mo , Xie Xiao-bao , Shi Qing-shan

    … In addition, xylitol and isothiazolones inhibited and restored the swimming motility of <i>P. …

    Journal of Oral Science 61(2), 255-263, 2019

    J-STAGE 

  • Human sperm swimming in a high viscosity mucus analogue

    Ishimoto Kenta , Gadêlha Hermes , Gaffney Eamonn A. , Smith David J. , Kirkman-Brown Jackson

    … Remarkably, mammalian sperm maintain a substantive proportion of their progressive swimming speed within highly viscous fluids, including those of the female reproductive tract. … Here, we analyse the digital microscopy of a human sperm swimming in a highly viscous, weakly elastic mucus analogue. …

    Journal of Theoretical Biology (446), 1-10, 2018-06-07

    IR 

  • Simple mechanosense and response of cilia motion reveal the intrinsic habits of ciliates

    Ohmura Takuya , Nishigami Yukinori , Taniguchi Atsushi , Nonaka Shigenori , Manabe Junichi , Ishikawa Takuji , Ichikawa Masatoshi

    … In other words, ciliates can skillfully use both the sliding motion to feed on a surface and the traveling motion in bulk water to locate new surfaces according to the single "swimming" mission. …

    Proceedings of the National Academy of Sciences of the United States of America 115(13), 3231-3236, 2018-03-27

    IR 

  • Swimming Mechanism of Helical Shaped Bacteria Possessing Intracellular Flagella  [in Japanese]

    TAKABE Kyosuke , KAWAMOTO Akihiro , NAKAMURA Shuichi

    … <p>Motility greatly benefits bacteria, e.g., nutrition, infection, and dissemination. … A distinct manner of spirochete motility attributed to the unique cell structure have intrigued many researchers, but detailed mechanism of how the intracellular flagella rotate the helical cell body and thereby generate thrust remains unknown. … In this review, we outline the cell structure and motility of the spirochete <i>Leptospira</i> …

    Seibutsu Butsuri 58(4), 191-195, 2018

    J-STAGE  Ichushi Web 

  • Cross-kymography analysis to simultaneously quantify the function and morphology of the archaellum

    Kinosita Yoshiaki , Nishizaka Takayuki

    … <p>In many microorganisms helical structures are important for motility, e.g., bacterial flagella and kink propagation in <i>Spiroplasma eriocheiris</i>. … However, the shape and rotational rate of the archaellum during swimming remained unclear, due to the low signal and lack of temporal resolution. …

    Biophysics and Physicobiology 15(0), 121-128, 2018

    J-STAGE 

  • Motility of Mollicutes overviewed through infection and survival  [in Japanese]

    宮田 真人

    日本マイコプラズマ学会雑誌 = Japanese journal of mycoplasmology (44), 27-30, 2017-05-27

  • Chloroform extract of turmeric inhibits biofilm formation, EPS production and motility in antibiotic resistant bacteria

    Hayat Sumreen , Sabri Anjum N. , McHugh Timothy D.

    … The extract exhibited its antibiofilm effect by altering adherence, motility, extracellular polymeric substance (EPS) production and cell surface hydrophobicity; … The chloroform extract inhibited flagella-directed swarming and swimming motility and pilus-directed twitching motility in a dose-dependent manner. … In addition to repression of motility, a chloroform extract also significantly (<i>p</i> …

    The Journal of General and Applied Microbiology 63(6), 325-338, 2017

    J-STAGE 

  • Flagellin FliC Phosphorylation Affects Type 2 Protease Secretion and Biofilm Dispersal in Pseudomonas aeruginosa PAO1

    Suriyanarayanan Tanujaa , Periasamy Saravanan , Lin Miao-Hsia , Ishihama Yasushi , Swarup Sanjay

    … In this study, we show the role of S/T phosphorylation of one motility protein, FliC, in regulating multiple surface-associated phenomena of P. … The absence of phosphorylation in the conserved T27 and S28 residues of FliC, interestingly, did not affect swimming motility, but affected the secretome of type 2 secretion system (T2SS) and biofilm formation of PAO1. …

    PLOS ONE 11(10), 2016-10-04

    IR 

  • Virulence characteristics of extraintestinal pathogenic <i>Escherichia coli</i> deletion of gene encoding the outer membrane protein X

    MENG Xianrong , LIU Xueling , ZHANG Liyuan , HOU Bo , LI Binyou , TAN Chen , LI Zili , ZHOU Rui , LI Shaowen

    … deletion mutant exhibited increased swimming motility and decreased adhesion to, and invasion of pulmonary epithelial A549 cell, compared to the wild-type strain. …

    Journal of Veterinary Medical Science 78(8), 1261-1267, 2016

    J-STAGE  Ichushi Web 

  • The Role of <i>cheA</i> Genes in Swarming and Swimming Motility of <i>Pseudomonas pseudoalcaligenes</i> KF707

    Fedi Stefano , Barberi Tania Triscari , Nappi Maria Rosaria , Sandri Federica , Booth Sean , Turner Raymond J. , Attimonelli Marcella , Cappelletti Martina , Zannoni Davide

    … and <i>cheA3</i>, have no role in swimming or chemotaxis in <i>P. …

    Microbes and Environments 31(2), 169-172, 2016

    J-STAGE 

  • Kinetic Analysis on the Motility of Liverwort Sperms Using a Microscopic Computer-Assisted Sperm Analyzing System

    FURUICHI Takuya , MATSUURA Koji

    … Because sperm motility is one of the most important features for the fertility in human and animals, percentage of motility and the kinetic parameters for swimming and the guidance to eggs (taxis) are well focused in the field of reproductive biology to evaluate and improve the male infertility. … In the present study, we performed high throughput analysis on the sperm motility in the most common liverwort, <i>Marchantia polymorpha</i> …

    Environment Control in Biology 54(1), 45-49, 2016

    J-STAGE 

  • 1C45 A Numerical Simulation of Sperm Cell Locomotion in Shear Flow  [in Japanese]

    OMORI Toshihiro , ISHIKAWA Takuji

    … Fluid mechanics then becomes a subject of growing importance in sperm motility. … In this study, we numerically investigate sperm cell behavior in shear flow near a plane wall to quantitatively understand how fluid mechanics affects on swimming of sperm cell. … As a result, the sperm cell shows reorient to upstream and keeps on swimming against the fluid flow. …

    The Proceedings of the Bioengineering Conference Annual Meeting of BED/JSME 2016.28(0), _1C45-1_-_1C45-3_, 2016

    J-STAGE 

  • 1C44 Effect of viscoelasticity on motion characteristics of bovine sperm  [in Japanese]

    YAMAMOTO Satoru , MORI Kotaro , SATO Koichi , HYAKUTAKE Toru

    … The swimming process by which mammal spermatozoa progress towards an egg within the reproductive organs is important in achieving successful internal fertilization. … In this study, we experimentally observed sperm motion in Newtonian and non-Newtonian fluids using the semen of Japanese cattle in order to investigate the effect of viscoelasticity on bovine sperm motility. … The difference in the way of swimming may lead to the change in linearity of sperm motion. …

    The Proceedings of the Bioengineering Conference Annual Meeting of BED/JSME 2016.28(0), _1C44-1_-_1C44-5_, 2016

    J-STAGE 

  • 高圧力顕微鏡法による細菌運動観察  [in Japanese]

    西山 雅祥

    … The developed system allowed us to monitor the motility of swimming Escherichia coli cells. … The fraction and speed of swimming cells decreased with increased pressure. … At 80 MPa, all cells stopped swimming and simply diffused in solution. … Direct observation of the motility of single flagellar motors revealed that the motors function even at 80 MPa. …

    高圧バイオサイエンスとバイオテクノロジー, 75-81, 2015-11-01

    IR 

  • Fluid flow and sperm guidance: a simulation study of hydrodynamic sperm rheotaxis.

    Ishimoto Kenta , Gaffney Eamonn A

    … The study of guidance cues has fascinated sperm biologists and in particular the prospect of rheotaxis, that is a fluid flow orienting the direction of sperm swimming, has been the subject of extensive recent study, as readily motivated by the prospect that such guidance may be active in the mammalian female reproductive tract. …

    Interface 12(106), 2015-04-15

    IR 

  • On the Motility and Locomotive Organs of Beach Flea

    Sudo Seiichi , Amano Takuya , Shirai Atsushi , Hayase Toshiyuki

    … Some semiterrestrial beach fleas are capable of swimming movement using their pleopods in water. … Movements of swimming organ in beach flea were examined by high-speed video camera system. … The swimming legs of the beach flea were examined with a color 3D laser scanning microscope. … The relation between morphology of pleopod and motility of the beach flea was considered. …

    Journal of Aero Aqua Bio-mechanisms 4(1), 37-43, 2015

    J-STAGE 

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