Abstract
Cultivation processes involving filamentous fungi have been optimised for decades to obtain high product yields. Several bulk chemicals like citric acid and penicillin are produced this way. A simple adaptation of cultivation parameters for new production processes is not possible though. Models explaining the correlation between process-dependent growth behaviour and productivity are therefore necessary to prevent long-lasting empiric test series. Yet, filamentous growth consists of a complex microscopic differentiation process from conidia to hyphae resulting in various macroscopically visible appearances. Early approaches to model this morphologic development are recapitulated in this review to explain current trends in this area of research. Tailoring morphology by adjusting process parameters is one side of the coin, but an ideal morphology has not even been found. This article reviews several reasons for this fact starting with nutrient supply in a fungal culture and presents recent advances in the investigation of fungal metabolism. It illustrates the challenge to unfold the relationship between morphology and productivity.
Similar content being viewed by others
References
Abarca ML, Accensi F, Cano J, Cabañes FJ (2004) Taxonomy and significance of black aspergilli. Antonie Van Leeuwenhoek 86:33–49
Adams HL, Thomas CR (1988) The use of image analysis for morphological measurements on filamentous microorganisms. Biotechnol Bioeng 32(5):707–712
Allen DG, Robinson CW (1990) Measurement of rheological properties of filamentous fermentation broths. Chem Eng Sci 45:37–48
Alvarez-Vasquez F, Gonzales-Alcon C, Torres NV (2000) Metabolism of citric acid production by Aspergillus niger: model definition, steady state analysis and constrained optimization of citric acid production rate. Biotechnol Bioeng 70:82–108
Amanullah A, Christensen LH, Hansen K, Nienow AW, Thomas CR (2002) Dependence of morphology on agitation intensity in fed-batch cultures of Aspergillus oryzae and its implications for recombinant protein production. Biotechnol Bioeng 77(7):815–826
Amanullah A, Jüsten P, Davies A, Paul GC, Nienow AW, Thomas CR (2000) Agitation induced mycelial fragmentation of Aspergillus oryzae and Penicillium chrysogenum. Biochem Eng J 5:109–114
Amanullah A, Leonildi E, Nienow AW, Thomas CR (2001) Dynamics of mycelia aggregation in cultures of Aspergillus oryzae. Bioprocess Biosyst Eng 24:101–107
Ayazi Shamlou P, Makagiansar HY, Ison AP, Lilliy D, Thomas CR (1994) Turbulent breakage of filamentous microorganisms in submerged culture in mechanically stirred bioreactors. Chem Eng Sci 49(16):2621–2631
Bachewich C, Heath IB (1998) Radial F-actin arrays precede new hypha formation in Saprolegnia: implications for establishing polar growth and regulating tip morphogenesis. J Cell Sci 111:2005–2016
Bergter F (1978) Kinetic model of mycelial growth. Z Allg Mikrobiol 18(2):143–145
Bocking SP, Wiebe MG, Robson GD, Hansen K, Christiansen LH, Trinci APJ (1999) Effect of branch frequency in Aspergillus oryzae on protein secretion and culture viscosity. Biotechnol Bioeng 65(6):638–648
Borchert M, Libra JA (2001) Decolorization of reactive dyes by the white and rot fungus Trametes versicolor in sequencing bath reactors. Biotechnol Bioeng 57:313–321
Bowen AR, Chen-Wu JL, Momany M, Young R, Szaniszlo PJ, Robbins PW (1992) Classification of fungal chitin synthases. Proc Natl Acad Sci USA 89(2):519–523
Brakhage AA (1998) Molecular regulation of β-lactam biosynthesis in filamentous fungi. Microbiol Mol Biol Rev 62(3):547–585
Brakhage AA, Spröte PQ A-A, Gehrke A, Plattner H, Tüncher A (2004) Regulation of penicillin biosynthesis in filamentous fungi. Adv Biochem Eng Biotechnol 88:45–90
Broekhuijsen MP, Mattern IE, Contreras R, Kinghorn JR, van den Hondel CAMJJ (1993) Secretion of heterologous proteins by Aspergillus niger: production of active human interleukin-6 in a protease-deficient mutant by KEX2-like processing of a glucoamylase-hIL6 fusion protein. J Biotechnol 31:135–145
Brown CM, Hugh JS (1965) Elongation of yeast cells in continuous culture. Nature 206(985):676–678
Caldwell IY, Trinci APJ (1973) The growth unit of the mould Geotrichum candidum. Arch Mikrobiol 88(1):1–10
Carter BLA, Bull AT (1971) The effect of oxygen tension in the medium on the morphology and growth kinetics of Aspergillus nidulans. J Gen Microbiol 65:265–273
Charles M (1978) Technical aspects of the rheological properties of microbial cultures. Adv Biochem Eng Biotechnol 8:1–62
Clark DS, Ito K, Horitsu H (1966) Effect of manganese and other heavy metals on submerged citric acid fermentation of molasses. Biotechnol Bioeng 8:465–471
Conesa A, Punt PJ, Luijk Nv, Hondel CAMJJvd (2001) The secretion pathway in filamentous fungi: a biotechnological view. Fungal Genet Biol 33(3):155–171
Cox PW, Thomas CR (1992) Classification and measurement of fungal pellets by automated image analysis. Biotechnol Bioeng 39:945–952
Cui YQ, Lans RGJMvd, Luyben KCAM (1997) Effect of agitation intensities on fungal morphology of submerged fermentation. Biotechnol Bioeng 55(5):715–726
Cui YQ, Lans RGJMvd, Luyben KCAM (1998) Effects of dissolved oxygen tension and mechanical forces on fungal morphology in submerged fermentation. Biotechnol Bioeng 57(4):409–419
David H, Akesson M, Nielsen J (2003) Reconstruction of the central carbon metabolism of Aspergillus niger. Eur J Biochem 270(21):4243–4253
Dickman MB, Yarden O (1999) Serin/threonine protein kinases and phosphatases in filamentous fungi. Fungal Genet Biol 26(2):99–117
Dunn-Coleman NS, Bloebaum P, Berka RM, Bodie E, Robinson N, Armstrong G, Ward M, Przetak M, Carter GL, LaCost R (1991) Commercial levels of chymosin production by Aspergillus. Nat Biotechnol 9(10):976–981
Edwards JS, Palsson BO (2000) The Escherichia coli MG 1655 in silico metabolic genotype: its definition, characteristics, and capabilities. Proc Natl Acad Sci USA 97:5528–5533
Elander RP (2003) Industrial production of βlactam antibiotics. Appl Microbiol Biotechnol 61:385–392
El-Enshasy HA, Hellmuth K, Rinas U (1999) Fungal morphology in submerged cultures and its relation to glucose oxidase excretion by recombinant Aspergillus niger. Appl Biochem Biotechnol 81(1):1–11
Emerson S (1950) The growth phase in Neurospora corresponding to the logarithmic phase in unicellular organisms. J Bacteriol 60(3):221–223
Escamilla Silva EM, Gutierrez GF, Dendooven L, Jiménez IH, Ochoa-Tapia JA (2001) A method to evaluate the isothermal effectiveness factor for dynamic oxygen into mycelial pellets in submerged cultures. Biotechnol Prog 17:95–103
Evers ME, Trip H, van den Berg MA, Bovenberg RAL, Driessen AJM (2004) Compartmentalization and transport in β-lactam antibiotics biosynthesis. Adv Biochem Eng Biotechnol 88:111–137
Fatile IA (1985) Rheological characteristics of suspensions of Aspergillus niger: correlations of rheological parameters with microbial concentration and shape of the mycelial aggregate. Appl Microbiol Biotechnol 21:60–64
Finkelstein DB (1987) Improvement of enzyme production in Aspergillus. Antonie Van Leeuwenhoek 53(5):349–352
Förster J, Famili I, Fu P, Palsson BO, Nielsen J (2003) Genome-scale reconstruction of the Saccharomyces cerevisiae metabolic network. Genome Res 13:244–253
Fu Y-C, Zhang TC, Bishop PL (1994) Determination of effective oxygen diffusivity in biofilms grown in a completely mixed biodrum reactor. Water Sci Technol 29(10–11):455–462
Fujita M, Iwahori K, S. T, Yamakawa K (1994) Analysis of pellet formation of Aspergillus niger based on shear-stress. J Ferment Bioeng 78(5):368–373
Fujiwara M, Horiuchi H, Ohta A, Takagi M (1997) A novel fungal gene encoding chitin synthase with a myosin motor-like domain. Biochem Biophys Res Comm. 236(1):75–78
Ganzlin M (2000) Untersuchungen der induzierten proteinproduktion unter kontrolle des glucoamylasepromotors in Aspergillus niger. Doctoral thesis, Braunschweig: Technische Universität Carolo-Wilhelmina
Gerngross TU (2004) Advances in the production of human therapeutic proteins in yeast and filamentous fungi. Nat Biotechnol 22(11):1409–1414
Gooday GW (1994) Cell Walls. In: Gow NAR, Gadd GM (eds) The growing fungus. Chapman & Hall, London, p 43–62
Grimm LH, Kelly S, Hengstler J, Göbel A, Krull R, Hempel DC (2004) Kinetic studies on the aggregation of Aspergillus niger conidia. Biotechnol Bioeng 87(2):213–218
Grimm LH, Kelly S, Völkerding II, Krull R, Hempel DC (in press) Influence of mechanical stress and surface interaction on the aggregation of Aspergillus niger conidia. Biotechnol Bioeng
Guebel DV, Darias NVT (2001) Optimization of the citric acid production by Aspergillus niger through a metabolic flux balance model. Electron J Biotechnol 4:1–17
Gupta JK, Helding LD, Jorgensen OB (1976) Effect of sugars, hydrogen ion concentration and ammonium nitrate on the formation of citric acid by Aspergillus niger. Acta Microbiol 23:63–67
Habison A, Kubicek CP, Röhr M (1979) Phosphofructokinase as a regulatory enzyme in citric acid producing Aspergillus niger. FEMS Microbiol Lett 5:39–42
Hamanaka T, Higashiyama K, Fujikawa S, Park EY (2001) Mycelial pellet intrastructure and visualization of mycelia and intracellular lipid in a culture of Mortierella alpina. Appl Microbiol Biotechnol 56:233–238
Han JR, An CH, Yuan JM (2005) Solid-state fermentation of cornmeal with the basidiomycete Ganoderma lucidum for degrading starch and upgrading nutritional value. J Appl Microbiol 99:910–915
Haq IU, Ali S, Qadeer MA, Iqbal J (2002) Effect of copper ions on mould morphology and citric acid productivity by Aspergillus niger using molasses based media. Process Biochem 37:1085–1090
Harris SD, Hamer L, Sharpless KE, Hamer JE (1997) The Aspergillus nidulanssepA gene encodes an FH 1/2 protein involved in cytokinesis and the maintenance of cellular polarity. EMBO J 16(12):3474–3483
Harris SD, Hofman AF, Tedford HW, Lee MP (1999) Identification and characterization of genes required for hyphal morphogenesis in filamentous fungus Aspergillus nidulans. Genetics 151:1015–1025
Hellendoorn L, Mulder H, Heuvel JCvd, Ottengraf SPP (1998) Intrinsic kinetic parameters of the pellet forming fungus Aspergillus awamori. Biotechnol Bioeng 58(5):478–485
Hille A, Neu TR, Hempel DC, Horn H (in press) Oxygen profiles and biomass distribution in biopellets of Aspergillus niger. Biotechnol Bioeng
Honecker S, Bisping B, Yang Z, Rehm HJ (1989) Influence of sucrose concentration and phosphate limitation on citric acid production by immobilized cells of Aspergillus niger. Appl Microbiol Biotechnol 31:17–24
Howard RJ, Aist JR (1980) Cytoplasmic microtubules and fungal morphogenesis: ultrastructural effects of methyl benzimidazole-2-ylcarbamate determined by freeze-substitution of hyphal tip cells. J Cell Biol 87(1):55–64
Huang MY, Bungay HR (1973) Microprobe measurements of oxygen concentrations in mycelial pellets. Biotechnol Bioeng 24:1193–1197
Jackson SL, Heath IB (1993) Roles of calcium ions in hyphal tip growth. Microbiol Rev 57(2):367–382
Johansen CL, Coolen L, Hunik JH (1998) Influence of morphology on product formation in Aspergillus awamori during submerged fermentations. Biotechnol Prog 14:233–240
Josten V, Lokman C, van den Hondel CAMJJ, Punt PJ (2003) The production of antibody fragments and antibody fusion proteins by yeast and filamentous fungi. Microbial Cell Factories 2(1):1–15
Jungebloud A, Bohle K, Goecke Y, Haesner M, Cordes C, Horn H, Hempel DC. (2005) Quantification of product- specific gene expression in biopellets of A niger with real-time PCR. Anal. Chem: submitted
Jüsten P, Paul GC, Nienow AW, Thomas CR (1996) Dependence of mycelial morphology on impeller type and agitation intensity. Biotechnol Bioeng 52(6):672–684
Kaminskyj SGW, Hamer JE (1998) hyp loci control cell pattern formation in the vegetative mycelium of Aspergillus nidulans. Genetics 148:669–680
Kanaly RA, Kim IS, Hur H-G (2005) Biotransformation of 3-methyl-4-nitrophenol, a main product of the insecticide fenitrothion, by Aspergillus niger. J Agric Food Chem 53:6426–6431
Kelly S, Grimm LH, Hengstler J, Schultheis E, Krull R, Hempel DC (2004) Agitation effects on submerged growth and product formation of Aspergillus niger. Bioprocess Biosyst Eng 26(5):315–323
Kossen NWF (2000) The morphology of filamentous Fungi. Adv Biochem Eng Biotechnol 70:1–34
Kristiansen B, Sinclair CG (1979) Production of citric acid in continuous culture. Biotechnol Bioeng 21:297–315
Kubicek CP, Röhr M (1977) Influence of manganese on enzyme synthesis and citric acid accumulation by Aspergillus niger. Eur J Appl Microbiol 4:167–173
Li ZJ, Shukla V, Wenger KS, Fordyce AP, Pedersen AG, Marten MR (2002) Effects of increased impeller power in a production-scale Aspergillus oryzae fermentation. Biotechnol Prog 18(3):437–444
Madhani HD, Fink GR (1998) The control of filamentous differentiation and virulence in fungi. Trends Cell Biol 8(9):348–353
Maeda H, Yamagata Y, Abe K, Hasegawa F, Machida M, Ishioka R, Gomi K, Nakajima T (2005) Purification and characterization of a biodegradable plastic-degrading enzyme from Aspergillus oryzae. Appl Microbiol Biotechnol 67:778–788
Magnuson JK, Lasure LL (2004) Organic acid production by filamentous fungi. In: Tkacz JS, Lange L (eds) Advances in fungal bio/technology for industry, agriculture and medicine. Springer, Berlin Heidelberg New York, p 307–340
Makagiansar HY, Ayazi Shamlou P, Thomas CR, Lilliy MD (1993) The influence of mechanical forces on the morphology and penicillin production of Penicillium chrysogenum. Bioprocess Eng 9(2–3):83–90
Maras M, Die Iv, Contreras R, Hondel CAMJJvd (1999) Filamentous fungi as production organisms for glycoproteins of bio-medical interest. Glycoconj J 16(2):99–107
McIntyre M, Müller C, Dynesen J, Nielsen J (2001) Metabolic engineering of the morphology of Aspergillus. Adv Biochem Eng Biotechnol 73:103–128
Metz B, Bruijn EWd, Suijdam JCv (1981) Method for quantitative representation of the morphology of molds. Biotechnol Bioeng 23:149–162
Metz B, Kossen NWF (1977) The growth of molds in the form of pellets—a literature review. Biotechnol Bioeng 14:781–799
Metz B, Kossen NWF, Suijdam JCv (1979) The rheology of mould suspensions. Adv Biochem Eng Biotechnol 11:104–56
Meyerhoff J, Bellgardt K-H (1995) Two mathematical models for the development of a single microbial pellet, part II. Bioprocess Eng 12:315–322
Meyerhoff J, Tiller V, Bellgardt K-H (1995) Two mathematical models for the development of a single microbial pellet. Part I: detailed morphological model based on the description of individual hyphae. Bioprocess Eng 12:305–313
Momamy M, Taylor I (2000) Landmarks in the early duplication cycles of Aspergillus fumigatus and Aspergillus nidulans: polarity, germ tube emergence and septation. Microbiology 146:3279–3284
Morita S, Kuriyama M, Nakatsu M, Kitano K (1994) High level expression of Fusarium alkaline protease gene in Acremonium chrysogenum. Biosci Biotechnol Biochem 58(4):627–630
Müller C, McIntyre M, Hansen K, Nielsen J (2002) Metabolic engineering of the morphology of Aspergillus oryzae by altering chitin synthesis. Appl Environ Microbiol 68(4):1827–1836
Müller C, Spohr A, Nielsen J (2000) Role of substrate concentration in mitosis and hyphal extension of Aspergillus. Biotechnol Bioeng 67:390–397
Nielsen J (1993) A simple morphologically structured model describing the growth of filamentous microorganisms. Biotechnol Bioeng 41(7):715–727
Nielsen J, Krabben P (1995) Hyphal growth and fragmentation of Penicillium chrysogenum in submerged cultures. Biotech Bioeng 46(6):588–598
Northrop FD, Ljubojevic S, Davies JM (1997) Influence of Na and anions on the dimorphic transition of Candida albicans. Microbiology 143:3757–3765
Olsvisk ES, Kristiansen B (1994) Rheology of filamentous fermentations. Biotechnol Adv 12:1–39
Papagianni M (2004) Fungal morphology and metabolite production in submerged mycelial processes. Biotechnol Adv 22:189–259
Papagianni M, Mattey M, Kristiansen B (1998) Citric acid production and morphology of Aspergillus niger as functions of the mixing intensity in a stirred tank and a tubular loop bioreactor. Biochem Eng J 2(3):197–205
Papagianni M, Mattey M, Kristiansen B (1999) The influence of glucose concentration on citric acid production and morphology of Aspergillus niger in batch and glucostat culture. Enzyme Microb Technol 25:710–717
Papagianni M, Moo-Young M (2002) Protease secretion in glucoamylase producer Aspergillus niger cultures: fungal morphology and inoculum effects. Process Biochem 37:1271–1278
Parton RM, Fischer S, Malhó R, Papasouliotis O, Jelitto TC, Leonard T, Read ND (1997) Pronounced cytoplasmic pH gradients are not required for tip growth in plant and fungal cells. J Cell Sci 110:1187–1198
Paul GC, Kent A, Thomas CR (1993) Viability testing and characterization of germination of fungal spores by automatic image analysis. Biotechnol Bioeng 42(1):11–23
Paul GC, Thomas CR (1998) Characterisation of mycelial morphology using image analysis. In: Scheper T (ed) Advances in biochemical engineering biotechnology. Springer, Berlin Heidelberg New York, p 2–59
Peksel A, Torres NV, Liu J, Juneau G, Kubicek CP (2002) 13C-NMR analysis of glucose metabolism during citric acid production by Aspergillus niger. Appl Microbiol Biotechnol 58:157–163
Pons MN, Vivier H (1998) Beyond filamentous species. In: Scheper T (ed) Advances in biochemical engineering biotechnology. Springer, Berlin Heidelberg New York, p 61–93
Prosser JI, Trinci APJ (1979) A model of hyphal growth and branching. J Gen Microbiol 111(1):153–164
Punt PJ, Biezen vN, Conesa A, Albers A, J. M, Hondel CAvd (2002) Filamentous fungi as cell factories for heterologous protein production. Trends Biotechnol 20:200–206
Radzio R, Kück U (1997) Synthesis of biotechnologically relevant heterologous proteins in filamentous fungi. Process Biochem 32(6):529–539
Reissig JL, Kinney SG (1983) Calcium as a branching signal in Neurosporacrassa. J Bacteriol 154(3):1397–1402
Riley GL, Tucker KG, Paul GC, Thomas CR (2000) Effect of biomass concentration and mycelial morphology on fermentation broth rheology. Biotechnol Bioeng 68(2):160–172
Rinas U, El-Enshasy HA, Emmler M, Hille A, Hempel DC, Horn H (2005) Model-based prediction of substrate conversion and protein synthesis and excretion in recombinant Aspergillus niger biopellets. Chem Eng Sci 60:2729–2739
Robson GD, Wiebe MG, Trinci APJ (1991) Exogenous cAMP and cGMP modulate branching in Fusarium graminearum. J Gen Microbiol 137(4):963–969
Schmidt FR (2004) Recombinant expression systems in the pharmaceutical industry. Appl Microbiol Biotechnol 65:363–372
Shu P, Johnson MG (1984) Citric acid production by submerged fermentation with Aspergillus niger. Ind Eng Chem 40(7):1202–1205
Smedsgaard J, Nielsen J (2005) Metabolite profiling of fungi and yeast: from phenotype to metabolome by MS and informatics. J Exp Bot 56(410):273–286
Sonneborn A, Bockmühl DP, Gerads M, Kurpanek K, Sanglard D, Ernst JF (2000) Protein kinase A encoded by TPK2 regulates dimorphism of Candida albicans. Mol Microbiol 35(2):386–396
Spohr A, Dam- Mikkelsen C, Carlsen M, Nielsen J, Villadsen J (1998) On-line study of fungal morphology during submerged growth in a small flow-through cell. Biotechnol Bioeng 58(5):541–543
Suijdam JCv, Metz B (1981) Influence of engineering variables upon the morphology of filamentous molds. Biotechnol Bioeng 23(1):111–148
Sumathi S, Manju BS (2000) Uptake of reactive textile dyes by Aspergillus foetidus. Enzyme Microb Technol 27:347–355
Taylor JW (1995) Making the Deuteromycota redundant: a practical integration of mitosporic and meiosporic fungi. Can J Bot 73:754–759
Torralba S, Raudaskoski M, Pedregosa AM, Laborda F (1998) Effect of cytochalasin A on apical growth, action cytoskeleton organization and enzyme secretion in Aspergillus nidulans. Microbiology 144(Pt1):45–53
Trinci APJ (1974) A study of the kinetics of hyphal extension and branch initiation of fungal mycelia. J Gen Microbiol 81(1):225–236
Tucker KG, Thomas CR (1993) Effect of biomass concentration and morphology on the rheological parameters of Penicillum chrysogenum fermentation broths. Trans Inst Chem Eng 71:111–117
Valkonen M, Ward M, Wang H, Pentttila M, Salonheimo M (2003) Improvenment of foreign-protein production in Aspergillus niger var. awamori by constitutive induction of the unfolded-protein response. Appl Environ Microbiol 69(12):6979–6986
Vanhoutte B, Pons MN, Thomas CR, Louvel L, Vivier H (1995) Characterization of Penicillium chrysogenum physiology in submerged cultures by color and monochrome image analysis. Biotechnol Bioeng 48(1):1–11
Ward M, Lin C, Victoria DC, Fox BP, Fox JA, Wong DL, Meerman HJ, Pucci JP, Fong RB, Heng MH et al (2004) Characterization of humanized antibodies secreted by Aspergillus niger. Appl Environ Microbiol 70(5):2567–2576
Wiebe MG, Karandikar A, Robson GD, Trinci APJ, Candia JF, Trapp S, Wallis G, Rinas U, Derkx PMF, Madrid SM et al (2001) Production of tissue plasminogen activator (t-PA) in Aspergillus niger. Biotechnol Bioeng 76(2):164–174
Wittler R, Baumgartl H, Lübbers DW, Schügerl K (1986) Investigations of oxygen transfer into Penicillium chrysogenum pellets by microprobe measurements. Biotechnol Bioeng 28:1024–1036
Wongwicharn A, McNeil B, Harvey LM (1999) Effect of oxygen enrichment on morphology, growth, and heterologous protein production in chemostat cultures of Aspergillus niger B1-D. Biotechnol Bioeng 65(4):416–424
Wösten HAB, Moukha SM, Sietsma JH, Wessels JGH (1991) Localization of growth and secretion of proteins in Aspergillus niger. J Gen Microbiol 137(1):2017–2023
Xiang X, Morris NR (1999) Hyphal tip growth and nuclear migration. Curr Opin Microbiol 2(6):636–640
Xu DB, Madrid CP, Röhr M, Kubicek CP (1989) The influence of type and concentration of the carbon source on production of citric acid by Aspergillus niger. Appl Microbiol Biotechnol 30:553–558
Yang H, King R, Reichl U, Gilles ED (1992a) Mathematical model for apical growth, septation, and branching of mycelial microorganisms. Biotechnol Bioeng 39(1):49–58
Yang H, Reichel U, King R, Gilles ED (1992b) Measurement and simulation of the morphological development of filamentous microorganisms. Biotechnol Bioeng 39(1):44–48
Zhang TC, Bishop PL (1994) Evaluation of tortuosity factors and effective diffusivities in biofilms. Water Res 28(11):2279–2287
Acknowledgement
Financial support was provided by the German Research Foundation (DFG) through the collaborative research centre SFB 578 - “From gene to product” at the TU Braunschweig.
Author information
Authors and Affiliations
Corresponding author
Rights and permissions
About this article
Cite this article
Grimm, L.H., Kelly, S., Krull, R. et al. Morphology and productivity of filamentous fungi. Appl Microbiol Biotechnol 69, 375–384 (2005). https://doi.org/10.1007/s00253-005-0213-5
Received:
Revised:
Accepted:
Published:
Issue Date:
DOI: https://doi.org/10.1007/s00253-005-0213-5