Effect of changed cultivation conditions on the morphology ofAspergillus niger and on citric acid biosynthesis in laboratory cultivation

Musílková, M.; Ujcová, E.; Seichert, L.; Fencl, Z.

doi:10.1007/bf02883134

Cited by 14 publications

(3 citation statements)

References 8 publications

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“…Changes in the chitin content of fungal cell walls as a result of altered growth conditions have been reported, e . g., Saccharomyces cerevisiae gmwn at nonpermissive temperatures accumulated more chitin than at permissive temperatures (Robert et al 1983); the apical tips of Aspsrgillus niger contained more chitin when grown in the presence of high oxygen than of low oxygen (Musilikova et al 1982); and the chitin content of Aspergillus giganteus was 9.6% in the dark and 18% in the light (Fiema 1983~).…”

Section: Discussionmentioning

confidence: 97%

Copper and cobalt alter the cell wall composition of Cunninghamella blakesleeana

Venkateswerlu¹,

Stotzky²

1986

Can. J. Microbiol.

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Cunninghamella blakesleeana was highly sensitive to Cu and Co on a medium containing NaNO3 as the sole nitrogen source. The nitrate reductive pathway was altered by Cu and Co, and NO-2 accumulated in the medium. Under conditions of Cu toxicity, the mycelium and the cell walls acquired a blue color, and most of the Cu was located in the cell walls, which differed in several aspects from cell walls derived from Co-containing or control cultures. At half-maximal growth inhibition by Cu (2.5 micrograms/mL or 39.3 microM) or Co (3.5 micrograms/mL or 59.4 microM), the mycelia contained 1.5 micrograms Cu or 1.0 microgram Co/mg dry tissue, respectively, but the isolated cell walls contained 33.5 micrograms Cu or 1.8 micrograms Co/mg dry cell wall. The phosphorous content of mycelia from Co-containing cultures was the same as that from control cultures, whereas that of mycelia from Cu-containing cultures contained 36% less. However, the phosphorous content of the cell walls from mycelia cultured in the presence of Cu or Co was two- and three-fold higher, respectively, than that of cell walls from control cultures. The cell walls of Cu-containing cultures contained significantly less hexosamine than the control cell walls, and chitin and chitosan were present in equal quantities. The cell walls of Co-containing cultures had the same amount of hexosamine as the control cell walls, but 88% of the hexosamine was present as chitosan and bound very little Co. The control cell walls contained approximately 60% chitosan.(ABSTRACT TRUNCATED AT 250 WORDS)

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Section: Discussionmentioning

confidence: 97%

Copper and cobalt alter the cell wall composition of Cunninghamella blakesleeana

Venkateswerlu¹,

Stotzky²

1986

Can. J. Microbiol.

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“…Among physical mutagens, the most common mutagens used are gamma and ultraviolet (UV) radiations (Pelechova et al, 1990). Among chemical mutagens, diethyl sulfonate, N-methyl-N-nitroso-guanidine, ethidium bromide aziridine, N-nitroso-N-methyl urea, and ethyl methane-sulfonate are very common (Musilkova et al 1983). Strain improvement through the parasexual cycle was first described by Pontecorvo et al (1953).…”

Section: Improvement Of Strains For Ca Productionmentioning

confidence: 99%

“…Among chemical mutagens, diethyl sulfonate, N ‐methyl‐ N ‐nitroso‐guanidine, ethidium bromide aziridine, N ‐nitroso‐ N ‐methyl urea, and ethyl methane‐sulfonate are very common (Musilkova et al. 1983). Strain improvement through the parasexual cycle was first described by Pontecorvo et al.…”

Section: Microorganisms Known To Produce Camentioning

confidence: 99%

Microbial citric acid: Production, properties, application, and future perspectives

Behera

Mishra²,

Mohapatra³

2021

Food Frontiers

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Microbial citric acid is an important organic acid widely used in pharmaceutical food, beverage, detergents, and cosmetics industries. Although citric acid is produced by different types of microorganism, the filamentous fungus Aspergillus niger is a workhorse for the production of citric acid. In the present review, special attention has been paid to address the advanced literature of citric acid production such as microorganism, substrates, screening methods, different fermentation techniques, different factors affecting citric acid production, and product recovery as well as numerous biotechnological applications of citric acid are also discussed for simple understanding of the subject.

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Gewinnung von pektinolytischen Enzymen aus Aspergillus niger in Submerskultur

Hermersdörfer¹,

Jelke²,

Leuchtenberger³

et al. 1984

J of Basic Microbiology

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Our present knowledge of the production of pectolytie enzymes and thc regulation of thcir synthcsis is reviewed. Emphasis is laid on thc submerged production of polygnlacturonase by Aspergillus niger, with sperial attention being paid to the correlation between mycelial morphology and crizynie synthesis. A . niger is singled out as the main industrial organism of large scale production of pectinases. Discrepancies in the literature regarding essential parameters for submerged cultivation of A . niger are regnrded as being due to strain-specific properties of the different producer organisms.

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Effect of changed cultivation conditions on the morphology ofAspergillus niger and on citric acid biosynthesis in laboratory cultivation

Cited by 14 publications

References 8 publications

Copper and cobalt alter the cell wall composition of Cunninghamella blakesleeana

Copper and cobalt alter the cell wall composition of Cunninghamella blakesleeana

Microbial citric acid: Production, properties, application, and future perspectives

Gewinnung von pektinolytischen Enzymen aus Aspergillus niger in Submerskultur

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