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Kinetic Modelling of Lovastatin Biosynthesis by Aspergillus Terreus Cultivated on Lactose and Glycerol as Carbon Sources

100%
Pawlak M., Bizukojć M.
Chemical and Process Engineering
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2012
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vol. 33
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issue 4
651-665
EN
A kinetic model to describe lovastatin biosynthesis by Aspergillus terreus ATCC 20542 in a batch culture with the simultaneous use of lactose and glycerol as carbon sources was developed. In order to do this the kinetics of the process was first studied. Then, the model consisting of five ordinary differential equations to balance lactose, glycerol, organic nitrogen, lovastatin and biomass was proposed. A set of batch experiments with a varying lactose to glycerol ratio was used to finally establish the form of this model and find its parameters. The parameters were either directly determined from the experimental data (maximum biomass specific growth rate, yield coefficients) or identified with the use of the optimisation software. In the next step the model was verified with the use of the independent sets of data obtained from the bioreactor cultivations. In the end the parameters of the model were thoroughly discussed with regard to their biological sense. The fit of the model to the experimental data proved to be satisfactory and gave a new insight to develop various strategies of cultivation of A. terreus with the use of two substrates.
2
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Terapia ręki u dzieci z mózgowym porażeniem dziecięcym (MPD) – Grupa Piratów

81%
Pawlak M., Wnuk B., Kowalicka D., Rosłoniec A.
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2018
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vol. 31
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issue 4
57-67
EN
Introduction Children with cerebral palsy (CP) in the form of spastic hemiplegia experience numerous difficulties concerning an affected upper limb such as reaching for objects, gripping or manipulating them. These limitations affect their everyday activity. Conducting an effective and simultaneously an interesting therapy aimed at meeting the child’s individual needs and improving upper limb function is a challenge for a physiotherapist. The aim of the study was to assess the effectiveness of upper limb therapy carried out within the project titled “The Pirate Group” based on Constraint-Induced Movement Therapy (CIMT) and Bimanual Training (BIT) conducted in a specially arranged environment. Material and methods The research included 16 children with CP in the form of spastic hemiplegia. Mean age of the study participants was 4.23 years. The children underwent a two-week Constraint-Induced Movement Therapy (CIMT) combined with Bimanual Training (BIT). In order to evaluate the effects of the therapy, each child underwent the Assisting Hand Assessment (AHA) prior to the therapy and after its completion. Results Statistical analysis revealed a significant difference (p<0.05) between the results of AHA prior to and after the therapy (t(14)=9.12, p<0.0001). An improvement in the affected upper limb function was noted in all the children participating in the research. Conclusions The project titled “The Pirate Group”, based on CIMT and BIT is an effective therapeutic intervention which improves spontaneous activity of the affected upper limb in children with hemiplegia.
3
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Epiretinal membrane and cataract in a 5-year-old boy with the suspicion of neurofibromatosis type 2

81%
Siwiec-Proscinska J., Gotz-Wieckowska A., Pawlak M., Kociecki J.
Open Medicine
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2013
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vol. 8
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issue 1
80-83
EN
Different ocular findings have been described in association with neurofibromatosis 2 (NF2). Detailed ophthalmological examination of asymptomatic subjects with a family history of NF2 could help confirm the diagnosis in young patients. We present a case of unilateral cataract and bilateral epiretinal membranes in a 5-year-old boy with a family history of neurofibromatosis 2. The patient was referred to our department with diminished visual acuity bilaterally and an initial diagnosis of cataract in the right eye. Bestcorrected visual acuity was 3/19 in the right eye and 3/24 in the left eye (LH charts). On fundus examination, bilateral macular epiretinal membranes were found and confirmed by optical coherent tomography. In view of the ophthalmic signs mentioned above and the history of the patient’s father, who suffered from NF2 and died from meningioma and ependymoma, the patient was referred for genetic examination. Seventeen exons of the NF2 gene were tested with negative results. No pathology was found on clinical neurologic examination and magnetic resonance imaging of the brain. Although the patient has not met the criteria for NF2, he is now considered as an asymptomatic subject at risk and observed. Lens opacities with epiretinal membranes in children may be regarded as part of the clinical manifestation of NF2.
4
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Impact of bioreactor scale on lovastatin biosynthesis byAspergillus terreusATCC 20542 in a batch culture

81%
Pawlak M., Bizukojć M., Ledakowicz S.
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EN
Biosynthesis of lovastatin (a polyketide metabolite of Aspergillus terreus) in bioreactors of different working volume was studied to indicate how the change of scale of the process influences the formation of this metabolite. The experiments conducted in shake flasks of 150 ml working volume allowed to obtain lovastatin titres at the level of 87.5 mg LOV l-1, when two carbon sources, namely lactose and glycerol were used. The application of the same components in a large stirred-tank bioreactor of 5.3-litre working volume caused a decrease of lovastatin production by 87% compared to the shake flask culture. The deficiency of nitrogen in this bioreactor did not favour the formation of lovastatin, in contrast to the small bioreactor of 1.95-litre working volume, in which lovastatin titres comparable to those in the shake flasks could be achieved, when organic nitrogen concentration was two-fold decreased. When the control of pH and/or pO2 was used simultaneously, an increase in lovastatin production was observed in the bioreactors. However, these results were still slightly lower than lovastatin titres obtained in the shake flasks.
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