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Dimensionless Numbers to Analyze Expansive Growth Processes.
Plants (Basel)
January 2019
Department of Mechanical Engineering, University of Colorado Denver, Denver, CO 80217-3364, USA.
Cells of algae, fungi, and plants have walls and exhibit expansive growth which can increase their volume by as much as 10,000 times. Expansive growth is central to their morphogenesis, development, and sensory responses to environmental stimuli. Equations describing the biophysical processes of the water uptake rate and the wall deformation rate have been derived, validated, and established.
View Article and Find Full Text PDFInhibitory effects of cysteine and cysteine derivatives on germination of sporangiospores and hyphal growth of different Zygomycetes.
Mycopathologia
September 2009
Department of Microbiology, Faculty of Science and Informatics, University of Szeged, Közép fasor 52, 6726 Szeged, Hungary.
The in vitro antifungal activity of cysteine (D- and L-cysteine) and its four derivatives (L-cysteine-methyl-ester, N-acetyl-cysteine, N-isobutyryl-D-cysteine, and N-isobutyryl-L-cysteine) were investigated on 20 fungal isolates representing 16 genera (Absidia, Actinomucor, Backusella, Gilbertella, Micromucor, Mortierella, Mucor, Mycotypha, Phycomyces, Rhizomucor, Rhizopus, Saksenaea, Syncephalastrum, Thamnostylum, Umbellopsis, and Zygorynchus). The inhibitory potential of different concentrations of these compounds, ranging from 0.625 to 10 mM, were investigated on the germination of sporangiospores as well as on hyphal extension, using broth microdilution method and agar plate test.
View Article and Find Full Text PDFModification of sexual development and carotene production by acetate and other small carboxylic acids in Blakeslea trispora and Phycomyces blakesleeanus.
Appl Environ Microbiol
July 2006
Departamento de Genética, Facultad de Biología, Apartado 1095, E-41080 Sevilla, Spain.
In Phycomyces blakesleeanus and Blakeslea trispora (order Mucorales, class Zygomycetes), sexual interaction on solid substrates leads to zygospore development and to increased carotene production (sexual carotenogenesis). Addition of small quantities of acetate, propionate, lactate, or leucine to mated cultures on minimal medium stimulated zygospore production and inhibited sexual carotenogenesis in both Phycomyces and Blakeslea. In Blakeslea, the threshold acetate concentration was <1 mmol/liter for both effects, and the concentrations that had one-half of the maximal effect were <2 mmol/liter for carotenogenesis and >7 mmol/liter for zygosporogenesis.
View Article and Find Full Text PDFSpecific and reversible inactivation of Phycomyces blakesleeanus isocitrate lyase by ascorbate-iron: role of two redox-active cysteines.
Fungal Genet Biol
April 2002
Departamento de Bioquímica y Biología Molecular, Universidad de León, León, 24007, Spain.
Phycomyces blakesleeanus isocitrate lyase (EC 4.1.3.
View Article and Find Full Text PDFThe pH dependence and modification by diethyl pyrocarbonate of isocitrate lyase from Phycomyces blakesleeanus.
Eur J Biochem
September 1995
Departamento de Bioquímica y Biología Molecular, Universidad de León, Spain.
We determined the variation with pH of the kinetic parameters for the isocitrate cleavage reaction catalyzed by Phycomyces isocitrate lyase, with the aim of elucidating the role played by ionising amino acid residues in binding and catalysis. The log VmaxpH profile shows that the enzyme possesses two ionising groups with pK values of 6.1 and 8.
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