Mikroskopische Untersuchungen zur Wachstumskinetik von <i>Streptomyces hygroscopicus</i>

Schuhmann, Edith; Bergter, F.

doi:10.1002/jobm.19760160305

Cited by 27 publications

(9 citation statements)

References 27 publications

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“…The initial exponential phase of growth predicted by Pirt has been confirmed experimentally for unicellular (Wimpenny & Lewis, 1977;Wimpenny, 1979) and filamentous (Schuhmann & Bergter, 1976) bacteria, and for moulds (Trinci, 1974). Also, Yanagita & Kogane (1963) showed that the specific rate of [32P]orthophosphate uptake (= growth rate) at the centre of a colony of Aspergillus niger occurred at only 3% of the rate in the peripheral growth zone.…”

Section: Introductionmentioning

confidence: 74%

Glucose and Penicillin Concentrations in Agar Medium Below Fungal Colonies

et al. 1987

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The growth of colonies of Rhizoctonia cerealis and Penicillium chrysogenum on solid media in plate cultures was studied. When grown on defined media containing 10-50 mM-glucose, R. cerealis did not cause a significant reduction in the glucose concentration of the medium in advance of colonization, but did cause the formation of a steep glucose concentration gradient in the substrate below the colony; the medium directly below the centre of a 7 cm diameter colony of R. cerealis was exhausted of glucose even when the fungus was grown on medium containing 50 mM-glucose. Penicillin produced by colonies of P. chrysogenum accumulated in the medium in advance of fungal colonization. For a period up to about 18 d after inoculation, the concentration of penicillin in the medium throughout the plate increased with colony development and thereafter, except at the margins of the plate, decreased.

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Section: Introductionmentioning

confidence: 74%

Glucose and Penicillin Concentrations in Agar Medium Below Fungal Colonies

et al. 1987

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“…Mathematical models for growth and branching of ®l-amentous fungi or bacteria have been postulated by several investigators [41,135]. Some of the properties predicted by these models, such as exponential increase in total length and number of branches, have been well or approximately con®rmed by experimental results.…”

Section: Methods Of Measuring the Morphologymentioning

confidence: 86%

Understanding the morphology of fungi

Pazouki

Panda

2000

Bioprocess Engineering

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Filamentous fungi comprise an industrially very important collection of microorganisms, since they are used for the production of a wide variety of products ranging from primary metabolites to secondary metabolites and further on to industrial enzymes (such as proteases, lipases and antibiotics). It is known that fungal morphology is often considered as one of the key parameters in industrial production. For the production of fungal metabolite products, the desired morphology varies from one product to another. Many parameters affect the morphology of fungi during the process of fermentation, among them speed of agitation, speci®c growth rate, dissolved oxygen, number of spores or conidia per liter of fermentation broth are important and should be considered when higher yield is desired in the process. It is, therefore, of considerable importance to understand the mechanism underlying the morphology of the cell, its growth and product formation by ®lamentous fungi. Such knowledge may be used in the optimization of the microbial process. Several literatures with various fungi to study their morphology, relating enzyme or product production to the character of the fungi in the study is reviewed. It is also considered that how the process parameters affects the morphology. The aim of this communication is to review the relevant literature to understand the morphology of ®lamentous fungi. List of symbols bhyphal density, lm/tip D i impeller diameter, m D pellet diameter (in Eqs. 4 and 5), mm D r dilution rate, h )1 k constant, number of section used for branching (in Eq. 7) K c constant K r constant (in Eq. 5) K r linear colony radial growth rate (in Eq. 1), lm/h L e mean length of main hyphae, lm L e *mean dimensionless length, lm L t mean total length of hyphae, lm L hgu mean length of hyphal growth unit, lm M 0 dry weight of mycelia at time t 0 , g M 1 dry weight of mycelia at time t 1 , g n number of disrupted pellets N impeller speed, h )

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“…Although mycelial growth of Streptomyces hygroscopicus (Schuhmann & Bergter 1976) and S. coelicolor (Allan & Prosser 1983) is biphasic, their growth kinetics resemble those ofG. candidum, namely, the total hyphal length of the mycelium and its num ber of branches increase exponentially at approximately the same specific rate.…”

Section: G Rowth Of Mycelia Formed By Fungi and Streptomycetesmentioning

confidence: 99%

Growth and form in lower plants and the occurrence of meristems

Trinci

Cutter

1986

Phil. Trans. R. Soc. Lond. B

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Fungi and streptomycetes have a similar morphology and in both groups branching appears to be regulated in a similar manner. Both types of hyphae grow by tip extension but streptomycete hyphae never attain the extension rates commonly observed for fungi. Fungal hyphae are able to attain high rates of extension because a very large volume of protoplasm contributes to tip growth and because a vesicular growth system facilitates the rapid assembly of the tip wall. Growth of fungal and streptomycete mycelia involves the duplication of a physiological unit of growth which consists of a tip and a portion of hypha whose average length remains constant. However, it is not clear that growth of such mycelia is truly modular. Although hyphal fusions within a mycelium are common in higher fungi their significance in the organism’s life style is not known. Growth in lower green plants, especially algae, is considered and the question of whether coenocytic algae are modular or not is discussed.

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Mikroskopische Untersuchungen zur Wachstumskinetik von Streptomyces hygroscopicus

Cited by 27 publications

References 27 publications

Glucose and Penicillin Concentrations in Agar Medium Below Fungal Colonies

Glucose and Penicillin Concentrations in Agar Medium Below Fungal Colonies

Understanding the morphology of fungi

Growth and form in lower plants and the occurrence of meristems

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