Bacterial Flagella and Motility

Pijper, Adrianus

doi:10.1038/161200b0

Cited by 15 publications

(12 citation statements)

References 2 publications

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“…The results were confirmed by measuring wavelengths on Salmonella typhi 901 suspended in phosphate buffer solutions of pH 6.05 and Because of these findings our further measurements were undertaken in media adjusted to pH 7.0. Efect of colloid substances Colloid substances such as gelatin, gums, agar and methylcellulose when present in bacterial suspensions precipitate on the bacteria and thus coat bodies, tails and helices, making them more readily visible in dark-ground microscopy (Pijper, 1947). We found that the wavelengths of helices, whilst not markedly affected by methylcellulose, were affected by other colloids.…”

Section: Effect Of Ph Valuementioning

confidence: 65%

“…When a sufficient number of tails had stiffened into helices as watched under the microscope, they were photographed with the sunlight dark-ground technique described before (Pijper, 1946). Electric lamps were inadequate, at any rate for the finer helices.…”

Section: Methodsmentioning

confidence: 99%

“…Flagella staining is preceded by drying which distorts, dislocates and redistributes the helical structures on the slide (Pijper, 1946). The flagella of P1.…”

Section: Effect Of Dryingmentioning

confidence: 99%

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The Wavelengths of Helical Bacterial Flagella

Pijper

Neser

Abraham³

1956

Journal of General Microbiology

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SUMMARY : During normal movement most motile bacteria carry a straight tail, which, when the movement slows, stiffens into helical structures commonly called flagella. The helices of many kinds of bacteria were photographed with a sunlight darkground microscope, and their wavelengths measured. Mean values and standard deviations were calculated for eacli strain and then for the species. 'Biplicity' (two wavelengths per bacterium, one twice the other) was observed frequently. Each strain appears to have its own constant wavelengths. The wavelength differs in different kinds of bacteria from 0.60 to 5058p., the distribution over the various species not revealing a distinct pattern nor any obvious correlation with other characteristics. The wavelength is affected by temperature, pH value, and colloid content of medium. These features, and the effects of drying, make stained preparations useless for measuring.

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Section: Effect Of Ph Valuementioning

confidence: 65%

Section: Methodsmentioning

confidence: 99%

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The Wavelengths of Helical Bacterial Flagella

Pijper

Neser

Abraham³

1956

Journal of General Microbiology

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“…At times the fascicles rotated at such high speed that they became merely a blur to the eye. Pijper (1957) has described the appearance and activity of flagellar fascicles in a variety of other bacterial species by sunlight darkfield microscopy and cinematography. He observed faint, smooth tails which often stiffened into helices; this may have represented either a slowing down of rapidly rotating fascicles (Stocker Received January 7, 1971 ferent configuration (Pijper 1957).…”

Section: Introductionmentioning

confidence: 99%

“…Pijper (1957) has described the appearance and activity of flagellar fascicles in a variety of other bacterial species by sunlight darkfield microscopy and cinematography. He observed faint, smooth tails which often stiffened into helices; this may have represented either a slowing down of rapidly rotating fascicles (Stocker Received January 7, 1971 ferent configuration (Pijper 1957). The helices formed by a given cell were often of two different wavelengths (biplicity), and different wavelengths were even observed in vivo on the same fascicle (Pijper 1957).…”

Section: Introductionmentioning

confidence: 99%

Flagellar activity in an aquatic bacterium

Strength¹,

Krieg²

1971

Can. J. Microbiol.

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The bipolar flagellar fascicles of a gram-negative, floc-forming, aquatic rod were studied. Each fascicle consisted of up to 11 individual flagella of 19-nm diameter with separate insertion sites in the cell wall. Fascicles exhibited three modes of behavior as illustrated by darkfield cinematography, (a) Extended helical fascicles exhibited wave propagation from base to tip at varying speeds with temporary stopping. (b) A fascicle could be retracted into the form of a polar coil as if it were a spring, the process beginning at the distal end and proceeding proximally. Fascicles could be reextended by reversal of this process. (c) An extended fascicle could bend at its base until it lay adjacent to the cell wall. This was preceded by an increase in wavelength and amplitude at the distal end which progressively affected the entire fascicle. After bending, a fascicle could swing back out again into the extended configuration. Despite the intense activity of the flagellar fascicles, the cells were found to be unable to swim about. Several possible explanations for this lack of motility are discussed. The unusual features of the flagellar activity are related to current concepts of the mechanisms of flagellar motion.

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Rototrichous: a new type of bacterial flagellation

Minasyan¹

2019

Arch Microbiol

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Bacterial Flagella and Motility

Cited by 15 publications

References 2 publications

The Wavelengths of Helical Bacterial Flagella

The Wavelengths of Helical Bacterial Flagella

Flagellar activity in an aquatic bacterium

Rototrichous: a new type of bacterial flagellation

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