1
|
Lapeña D, Olsen PM, Arntzen MØ, Kosa G, Passoth V, Eijsink VGH, Horn SJ. Spruce sugars and poultry hydrolysate as growth medium in repeated fed-batch fermentation processes for production of yeast biomass. Bioprocess Biosyst Eng 2019; 43:723-736. [PMID: 31883034 PMCID: PMC7064453 DOI: 10.1007/s00449-019-02271-x] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/17/2019] [Accepted: 12/13/2019] [Indexed: 02/07/2023]
Abstract
The production of microbial protein in the form of yeast grown on lignocellulosic sugars and nitrogen-rich industrial residues is an attractive approach for reducing dependency on animal and plant protein. Growth media composed of enzymatically saccharified sulfite-pulped spruce wood, enzymatic hydrolysates of poultry by-products and urea were used for the production of single-cell protein. Strains of three different yeast species, Cyberlindnera jadinii, Wickerhamomyces anomalus and Blastobotrys adeninivorans, were cultivated aerobically using repeated fed-batch fermentation up to 25 L scale. Wickerhamomyces anomalus was the most efficient yeast with yields of 0.6 g of cell dry weight and 0.3 g of protein per gram of glucose, with cell and protein productivities of 3.92 g/L/h and 1.87 g/L/h, respectively. Using the conditions developed here for producing W. anomalus, it would take 25 industrial (200 m3) continuously operated fermenters to replace 10% of the fish feed protein used in Norway.
Collapse
Affiliation(s)
- David Lapeña
- Faculty of Chemistry, Biotechnology and Food Science, Norwegian University of Life Sciences, P.O. Box 5003, N-1432, Ås, Norway
| | - Pernille M Olsen
- Faculty of Chemistry, Biotechnology and Food Science, Norwegian University of Life Sciences, P.O. Box 5003, N-1432, Ås, Norway
| | - Magnus Ø Arntzen
- Faculty of Chemistry, Biotechnology and Food Science, Norwegian University of Life Sciences, P.O. Box 5003, N-1432, Ås, Norway
| | - Gergely Kosa
- Faculty of Chemistry, Biotechnology and Food Science, Norwegian University of Life Sciences, P.O. Box 5003, N-1432, Ås, Norway
| | - Volkmar Passoth
- Department of Molecular Sciences, Swedish University of Agricultural Sciences, P.O. Box 7015, S-75007, Uppsala, Sweden
| | - Vincent G H Eijsink
- Faculty of Chemistry, Biotechnology and Food Science, Norwegian University of Life Sciences, P.O. Box 5003, N-1432, Ås, Norway
| | - Svein J Horn
- Faculty of Chemistry, Biotechnology and Food Science, Norwegian University of Life Sciences, P.O. Box 5003, N-1432, Ås, Norway.
| |
Collapse
|
2
|
Bacher C, Olsen PM, Bertelsen P, Sonnergaard JM. Granule fraction inhomogeneity of calcium carbonate/sorbitol in roller compacted granules. Int J Pharm 2008; 349:19-23. [PMID: 17765416 DOI: 10.1016/j.ijpharm.2007.07.016] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/13/2007] [Revised: 07/09/2007] [Accepted: 07/13/2007] [Indexed: 11/27/2022]
Abstract
The granule fraction inhomogeneity of roller compacted granules was examined on mixtures of three different morphologic forms of calcium carbonate and three particle sizes of sorbitol. The granule fraction inhomogeneity was determined by the distribution of the calcium carbonate in each of the 10 size fractions between 0 and 2000 microm and by calculating the demixing potential. Significant inhomogeneous occurrence of calcium carbonate in the size fractions was demonstrated, depending mostly on the particles sizes of sorbitol but also on the morphological forms of calcium carbonate. The heterogeneous distribution of calcium carbonate was related to the decrease in compactibility of roller compacted granules in comparison to the ungranulated materials. This phenomenon was explained by a mechanism where fracturing of the ribbon during granulation occurred at the weakest interparticulate bonds (the calcium carbonate: calcium carbonate bonds) and consequently exposed the weakest areas of bond formation on the surface of the granules. Accordingly, the non-uniform allocation of the interparticulate attractive forces in a tablet would cause a lowering of the compactibility. Furthermore, the ability of the powder to agglomerate in the roller compactor was demonstrated to be related to the ability of the powder to be compacted into a tablet, thus the most compactable calcium carbonate and the smallest sized sorbitol improved the homogeneity by decreasing the demixing potential.
Collapse
Affiliation(s)
- C Bacher
- Department of Pharmaceutics and Analytical Chemistry, Faculty of Pharmaceutical Sciences, University of Copenhagen, DK-2100 Universitetsparken 2, Copenhagen, Denmark
| | | | | | | |
Collapse
|
3
|
Bacher C, Olsen PM, Bertelsen P, Kristensen J, Sonnergaard JM. Improving the compaction properties of roller compacted calcium carbonate. Int J Pharm 2007; 342:115-23. [PMID: 17582712 DOI: 10.1016/j.ijpharm.2007.05.007] [Citation(s) in RCA: 30] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/10/2007] [Revised: 03/15/2007] [Accepted: 05/04/2007] [Indexed: 11/22/2022]
Abstract
The effects of roller compaction process parameters, morphological forms of calcium carbonate and particle size of sorbitol on flow, compaction and compression properties were investigated. The morphology of the calcium carbonate and the sorbitol particle size were more influential on the compaction properties than the settings of the roller compactor. The roller compaction process was demonstrated to be robust and stable in regard to flowability and compactibility. The flowability of the granules was improved adequately to facilitate compression in a production scale rotary tablet press. By adding sorbitol to the calcium carbonate, the compressibility - characterized by the Walker coefficient W(ID) - and the compactibility C(P) were improved considerably. A correlation between the consolidation characteristics was demonstrated. Compactibility data from the compaction simulator correlated with the tablet press for two of the calcium carbonates, the cubic form and the ground quality.
Collapse
Affiliation(s)
- C Bacher
- Department of Pharmaceutics and Analytical Chemistry, Faculty of Pharmaceutical Sciences, University of Copenhagen, DK-2100 Universitetsparken 2, Copenhagen, Denmark
| | | | | | | | | |
Collapse
|
4
|
Olsen PM, Uldall PV, Alving J, Pedersen H. [Congenital bilateral perisylvian syndrome]. Ugeskr Laeger 1998; 160:4307-4309. [PMID: 9679434] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/22/2023]
Abstract
The congenital bilateral perisylvian syndrome is characterized by pseudobulbar palsy, moderate delay in mental and motor development and epilepsy. Three characteristic case stories are presented. Epileptic seizures are most frequently generalized: tonic, astatic, atypical absences and tonic-clonic seizures. Partial seizures are less frequent. Seizure control is often unsatisfactory. Neuroimaging demonstrates thickening of the cerebral cortex in the perisylvian area bilaterally; these changes together with the clinical picture establish the diagnosis. The etiology is unknown.
Collapse
|
5
|
Olsen PM, Lorentzen H, Thomsen K, Fogtmann A. [Medication errors in a pediatric department]. Ugeskr Laeger 1997; 159:2392-5. [PMID: 9163117] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/04/2023]
Abstract
In a prospective study, iatrogenic medication errors were registered among paediatric admissions. The two most common causes of incidents were neglecting to give a medication on schedule and administration of an incorrect dose-but extra dose errors, errors of omission, wrong rate errors and administration of unauthorized drugs also occurred. After implementation of a satellite pharmacy, medication error rates were compared, and a reduction of the more serious and potentially harmful incidents was shown.
Collapse
|
6
|
Olsen PM, Hornsleth A, Krasilnikoff PA. [Varying clinical pictures among young children with influenza virus type A infections]. Ugeskr Laeger 1992; 154:560-3. [PMID: 1539390] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
Abstract
The clinical course of Influenza type A virus infections in 47 hospitalized children aged 0-9 years was assessed retrospectively. The infection was diagnosed by demonstration of the virus in the nasopharyngeal secretion during the acute phase of the illness. Out of 21 Influenza A strains in which the subtype was determined, one was found to be H1- and 20 were H3-subtype. Lower respiratory tract disease was the main diagnosis in 21 children, 16 of whom had pneumonia; 14 of these patients were under three years of age. Gastro-intestinal symptoms occurred in 40% of the children over three years of age. Eight patients had febrile convulsions, a girl aged nine years had double vision and vertigo and a female infant aged two months had periodic apnoea and bradycardia. The reasons for hospitalization were febrile convulsions, abdominal pain, lower respiratory tract symptoms and high pyrexia.
Collapse
Affiliation(s)
- P M Olsen
- Hvidovre Hospital, København, børneafdelingen
| | | | | |
Collapse
|
7
|
Burgaard P, Blyme PJ, Olsen PM, Kristensen G. Rupture of the knee capsule from articular hyperpressure. Experiments in cadaver knees. Acta Orthop Scand 1988; 59:692-4. [PMID: 3213458 DOI: 10.3109/17453678809149427] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/04/2023]
Abstract
We used 10 cadaver knees to estimate the safe pressure during arthroscopy by measuring the volumes and pressures of irrigation fluid at different flexion angles. Maximum volumes could be contained at 35 degrees of flexion. Pressures of 200 to 450 mmHg were measured, and all the knees ruptured by extension or flexion after they were filled to 100 mmHg at 35 degrees of flexion. Fifty milliliters of irrigation fluid had to be removed if the pressure remained constant when extending from 35 degrees and 70 ml when flexing to 90 degrees. Totally, 100 ml irrigation fluid had to be removed when flexing from 35 degrees to 120 degrees. Our investigation indicates that a pressure of 150 mmHg can be tolerated by all knees. Both flexion and extension from the 35 degrees position must be done gently and slowly using a large bore, wide-open inflow and outflow tubes allowing egress of irrigation fluid to prevent capsular rupture, extravasation of irrigation fluid, vascular compromise, or compartment syndrome.
Collapse
Affiliation(s)
- P Burgaard
- Department of Orthopedics T, Gentofte Hospital, University of Copenhagen, Denmark
| | | | | | | |
Collapse
|