Now showing items 1-20 of 41

    • Adaptation at the output of the chemotaxis signalling pathway 

      Yuan, Junhua; Branch, Richard William; Hosu, Basarab Gabriel; Berg, Howard Curtis (2012)
      In the bacterial chemotaxis network, receptor clusters process input1–3, and flagellar motors generate output4. Receptor and motor complexes are coupled by the diffusible protein CheY-P. Receptor output (the steady-state ...
    • Adaptation Kinetics in Bacterial Chemotaxis 

      Block, Steven M.; Segall, Jeffrey E.; Berg, Howard Curtis (American Society for Microbiology, 1983)
      Cells of Escherichia coli, tethered to glass by a single flagellum, were subjected to constant flow of a medium containing the attractant alpha-methyl-DL-aspartate. The concentration of this chemical was varied with a ...
    • Adaptive Remodelling by FliN in the Bacterial Rotary Motor 

      Branch, Richard; Sayegh, Michael; Shen, Chong; Nathan, Vedavalli S.J.; Berg, Howard Curtis (Elsevier BV, 2014)
      Sensory adaptation in the Escherichia coli chemosensory pathway has been the subject of interest for decades, with investigation focusing on the receptors that process extracellular inputs. Recent studies demonstrate that ...
    • Amplitude and Decay Rate Analysis of Low Level Exponentially Decaying Radio-Frequency Signals 

      Berg, Howard (American Institute of Physics, 1965)
      A method is described which allows routine measurements of the relative amplitudes and absolute decay rates of low level exponentially decaying radio-frequency signals to be made to within an accuracy of 1%. The signals ...
    • Asymmetry in the Clockwise and Counter-Clockwise Rotation of the Bacterial Flagellar Motor 

      Yuan, Junhua; Fahrner, Karen Alicia; Turner, Linda; Berg, Howard (National Academy of Sciences, 2010)
      Cells of Escherichia coli are able to swim up gradients of chemical attractants by modulating the direction of rotation of their flagellar motors, which spin alternately clockwise (CW) and counterclockwise (CCW). Rotation ...
    • Cell motility: Turning failure into function 

      Berg, Howard Curtis (Springer Nature, 2013)
      In their search for more favourable environments bacteria choose new directions to explore, usually at random. In a marine bacterium with a single polar flagellum it is now shown that this quest is enhanced by a buckling ...
    • Coordination of Flagella on Filamentous Cells of Escherichia Coli 

      Ishihara, Akira; Segall, Jeffrey E.; Block, Steven M.; Berg, Howard Curtis (American Society for Microbiology, 1983)
      Video techniques were used to study the coordination of different flagella on single filamentous cells of Escherichia coli. Filamentous, nonseptate cells were produced by introducing a cell division mutation into a strain ...
    • Determination of the Quadrupole Coupling Constant in the N^{14} Atomic Ground State 

      Crampton, S. B.; Berg, Howard Curtis; Robinson, H. G.; Ramsey, Norman F. (American Physical Society, 1970)
      The zero-field hyperfine frequencies in the ground state of atomic N14 have been measured in a hydrogen maser with sufficient accuracy to resolve the quadrupole coupling constant B. The result is B=+1.32±0.20 Hz.
    • Dynamics of Bacterial Swarming 

      Darnton, Nicholas C.; Turner, Linda; Rojevsky, Svetlana; Berg, Howard Curtis (Biophysical Society, 2010)
      When vegetative bacteria that can swim are grown in a rich medium on an agar surface, they become multinucleate, elongate, synthesize large numbers of flagella, produce wetting agents, and move across the surface in ...
    • Dynamics of Mechanosensing in the Bacterial Flagellar Motor 

      Lele, Pushkar Prakash; Hosu, Basarab Gabriel; Berg, Howard Curtis (Proceedings of the National Academy of Sciences, 2013)
      Mechanosensing by flagella is thought to trigger bacterial swarmer-cell differentiation, an important step in pathogenesis. How flagellar motors sense mechanical stimuli is not known. To study this problem, we suddenly ...
    • The flagellar motor of Caulobacter crescentus generates more torque when a cell swims backward 

      Lele, Pushkar P.; Roland, Thibault; Shrivastava, Abhishek; Chen, Yihao; Berg, Howard C. (2016)
      Caulobacter crescentus, a monotrichous bacterium, swims by rotating a single right-handed helical filament. CW motor rotation thrusts the cell forward 1, a mode of motility known as the pusher mode; CCW motor rotation pulls ...
    • Following the Behavior of the Flagellar Rotary Motor Near Zero Load 

      Yuan, Junying; Berg, Howard (Springer Verlag, 2009)
      At room temperature at stall, the flagellar motor of the bacterium Escherichia coli exerts a torque of ~1300 pN nm. At zero external load, it spins ~330 Hz. Techniques for studying the motor near zero load are novel and ...
    • Forced Axial Flow Between Rotating Concentric Cylinders 

      Barcilon, Victor; Berg, Howard Curtis (Cambridge University Press (CUP), 1971)
      Forced axial flow in an annular gap of a cylindrical rotor is investigated analytically and experimentally. At small rotation rates and narrow gap widths, the axial flow is a simple Poiseuille flow over most of the rotor. ...
    • The Gain Paradox 

      Berg, Howard (Elsevier, 2009)
      Chemoreceptors in Escherichia coli control the activity of a kinase that phosphorylates a response regulator that, in turn, biases the direction of rotation of flagellar motors, affecting the manner in which cells swim. A ...
    • Gliding Motility of Cytophaga Sp. Strain U67 

      Lapidus, I. Richard; Berg, Howard Curtis (American Society for Microbiology, 1982)
      Video techniques were used to analyze the motion of the gliding bacterium Cytophaga sp. strain U67. Cells moved singly on glass along the long axis at a speed of about 2 micrometers/s, advancing, retreating, stopping, ...
    • Growth of Flagellar Filaments of Escherichia coli is Independent of Filament Length 

      Turner, Linda; Stern, Alan S.; Berg, Howard Curtis (American Society for Microbiology, 2012)
      Bacterial flagellar filaments grow at their distal ends, from flagellin that travels through a central channel \(\sim 2 nm\) in diameter. The flagellin is extruded from the cytoplasm by a pump powered by a proton motive force ...
    • How to Track Bacteria 

      Berg, Howard Curtis (AIP Publishing, 1971)
      A microscope is described which automatically remains focused on individual motile bacteria. The container in which the bacteria are suspended is moved in such a way that the position of a given organism remains fixed; x, ...
    • Hydrogen-Maser Principles and Techniques 

      Kleppner, Daniel; Berg, Howard; Crampton, S. B.; Ramsey, Norman; Vessot, Robert F. C.; Peters, H. E.; Vanier, Jacques (American Physical Society, 1965)
      Techniques and design principles relevant to the construction and operation of a hydrogen maser are presented in detail. These include methods for the generation of atomic hydrogen, state selection, design of the microwave ...
    • Marvels of Bacterial Behavior 

      Berg, Howard (American Philosophical Society, 2006)
    • Membrane Dipole Potentials 

      Berg, Howard Curtis (Elsevier BV, 1968)