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Chemotaxis in Escherichia coli analysed by Three-dimensional Tracking
Chemotaxis toward amino-acids results from the suppression of directional changes which occur spontaneously in isotropic solutions.
Movement of microorganisms in viscous environments
SOME microorganisms swim well in solutions containing viscous agents (molecules with long unbranched chains, such as methylcellulose)1–7. Leptospira, a slender helical bacterium, swims more rapidly… Expand
Bacteria Swim by Rotating their Flagellar Filaments
IT is widely agreed that bacteria swim by moving their flagella, but how this motion is generated remains obscure1,2. A flagellum has a helical filament, a proximal hook, and components at its base… Expand
Dynamic properties of bacterial flagellar motors
- H. Berg
- Physics, Medicine
- 3 May 1974
TETHERED bacteria1 rotate at the angular velocity at which the torque generated by the flagellar motor2 is balanced by the torque due to the viscous drag. In general, M = bηΩ, where M is the torque,… Expand
Specification of Gradients used for Studies of Chemotaxis
THE responses of motile bacteria to various chemicals were studied in the 1880s by Pfeffer1, who inserted a capillary tube containing a solution of an attractant into a suspension of bacteria and… Expand
Elastic anomalies at the second-order phase transition in MnAs
The elastic modulus combinations s11, 2s13 + s44, and s44 — 2s12 of MnAs are measured for temperatures between 290 and 420 K. At Tt = 400 K divergent behaviour of s11 and s13 is found, indicating… Expand
Double exchange in CrxMn1−xas compounds1)
The magnetic moment M and the specific resistivity ϱ of CrxMn1−xAs polycrystals are measured for temperatures between 5 and 300 K and for eight different compositions. Structures in the ϱ(T) and M(T)… Expand
[A low-risk substance for the lowering of reused levels of blood lipids].
- HOWARD C. Berg
- Fortschritte der Medizin
- 19 February 1981
Low temperature resistivity minimum in MnAs1−xPx compounds
Abstract The conductivity and the magnetic moment of MnAs 1− x P x single crystals have been measured in the temperature range from 5 to 300 K and for compositions between x = 0.03 and x = 0.12.… Expand