Change search
Link to record
Permanent link

Direct link
BETA
Publications (10 of 65) Show all publications
Myronycheva, O., Poohphajai, F., Sehlstedt-Persson, M., Vikberg, T., Karlsson, O., Junge, H. & Sandberg, D. (2019). Application of GRAS Compounds for the Control of Mould Growth on Scots Pine Sapwood Surfaces: Multivariate Modelling of Mould Grade. Forests, 10(9), Article ID 714.
Open this publication in new window or tab >>Application of GRAS Compounds for the Control of Mould Growth on Scots Pine Sapwood Surfaces: Multivariate Modelling of Mould Grade
Show others...
2019 (English)In: Forests, ISSN 1999-4907, E-ISSN 1999-4907, Vol. 10, no 9, article id 714Article in journal (Refereed) Published
Abstract [en]

Research Highlights: In this study, the Generally Recognised as Safe (GRAS) compounds were applied in order to study mould-fungi growth on dried Scots pine sapwood. Background and Objectives: The transition to the use of more sustainable wood-material may be possible by applying GRAS compounds that can control and prevent contamination by primary colonising mould fungi. Materials and Methods: Kiln-dried sawn timber was treated with three different GRAS compounds, and different fungal inoculation methods applied in order to investigate differences in the development of fungal communities. Results: Substances based on potassium silicate significantly reduced fungal growth and mould contamination on the studied wood surfaces. By combining wood-surface treatments with GRAS compounds, fungal-area size as predictors and mould grade as response, a partial least squares (PLS) model that makes it possible to predict mould grade on wood surfaces was developed. The PLS model is a key component in the development of a smart grading-systems equipped by e.g. high-speed digital cameras for the early detection of fungal attack on wood surfaces in different applications. However, the measurements based on chemical characterisation should be the next step to take in order significantly to enhance the model and increase the range of robust applications. In the current study, a multivariate model describing the influence of each fungal-covering area on mould grade was presented for the first time.

Place, publisher, year, edition, pages
MDPI, 2019
Keywords
bacteria, potassium silicate, N-Alkylbensyldimethylammonium chloride, wood, fungi, mould area, PLS modeling
National Category
Wood Science Other Mechanical Engineering
Research subject
Wood Science and Engineering
Identifiers
urn:nbn:se:ltu:diva-75696 (URN)10.3390/f10090714 (DOI)2-s2.0-85072556439 (Scopus ID)
Note

Validerad;2019;Nivå 2;2019-08-27 (johcin)

Available from: 2019-08-26 Created: 2019-08-26 Last updated: 2019-10-02Bibliographically approved
Sekan, A. S., Myronycheva, O., Karlsson, O., Gryganskyi, A. P. & Blume, Y. (2019). Green potential of Pleurotus spp. in biotechnology. PeerJ, 7, Article ID e6664.
Open this publication in new window or tab >>Green potential of Pleurotus spp. in biotechnology
Show others...
2019 (English)In: PeerJ, ISSN 2167-8359, E-ISSN 2167-8359, Vol. 7, article id e6664Article in journal (Refereed) Published
Abstract [en]

Background

The genus Pleurotus is most exploitable xylotrophic fungi, with valuable biotechnological, medical, and nutritional properties. The relevant features of the representatives of this genus to provide attractive low-cost industrial tools have been reported in numerous studies to resolve the pressure of ecological issues. Additionally, a number of Pleurotus species are highly adaptive, do not require any special conditions for growth, and possess specific resistance to contaminating diseases and pests. The unique properties of Pleurotus species widely used in many environmental technologies, such as organic solid waste recycling, chemical pollutant degradation, and bioethanol production.

Methodology

The literature study encompasses peer-reviewed journals identified by systematic searches of electronic databases such as Google Scholar, NCBI, Springer, ResearchGate, ScienceDirect, and ISI Web of Knowledge. The search scheme was divided into several steps, as described below.

Results

In this review, we describe studies examining the biotechnological feasibility of Pleurotus spp. to elucidate the importance of this genus for use in green technology. Here, we review areas of application of the genus Pleurotus as a prospective biotechnological tool.

Conclusion

The incomplete description of some fungal biochemical pathways emphasises the future research goals for this fungal culture.

Place, publisher, year, edition, pages
PeerJ, Inc, 2019
Keywords
Waste bioremediation, Mushroom cultivation, Pleurotus, Degradation, Polycyclic aromatic hydrocarbons, Enzyme, Lignin, Gene, Identification
National Category
Engineering and Technology Industrial Biotechnology Other Mechanical Engineering
Research subject
Wood Science and Engineering
Identifiers
urn:nbn:se:ltu:diva-73354 (URN)10.7717/peerj.6664 (DOI)000462697000007 ()30967974 (PubMedID)
Note

Validerad;2019;Nivå 2;2019-04-10 (inah)

Available from: 2019-03-29 Created: 2019-03-29 Last updated: 2019-04-12Bibliographically approved
Garskaite, E., Karlsson, O., Stankeviciute, Z., Aivaras, K., Jones, D. & Sandberg, D. (2019). Surface hardness and flammability of Na2SiO3 and nano-TiO2 reinforced wood composites. RSC Advances, 9(48), 27973-27986
Open this publication in new window or tab >>Surface hardness and flammability of Na2SiO3 and nano-TiO2 reinforced wood composites
Show others...
2019 (English)In: RSC Advances, ISSN 2046-2069, E-ISSN 2046-2069, Vol. 9, no 48, p. 27973-27986Article in journal (Refereed) Published
Abstract [en]

The objective of this study was to explore an effect of the combined inorganic materials on the wood hardness and flame-retardancy properties in a concept of sustainable material management. Herein, the reinforcement of Scots pine (Pinus sylvestris L.) sapwood with sodium silicate and TiO2 nanoparticles via vacuum-pressure technique is reported. Pyrolysis of modified wood was studied by TG-FTIR analysis; the results showed that maximum weight loss for the modified wood was obtained at 40–50 °C lower temperatures compared to the reference untreated wood. The Gram–Schmidt profiles and spectra extracted at maxima absorption from Gram–Schmidt plots indicated chemical changes in wood–inorganic composites. SEM/EDS analysis revealed the presence of Na–O–Si solid gel within the wood-cell lumen and showed that TiO2 was homogeneously distributed within the amorphous Na–O–Si glass-forming phase to form a thin surface coating. EDS mapping further revealed the higher diffusivity of sodium into the cell wall compared to the silicon compound. The presence of amorphous sodium silicate and nano-TiO2 was additionally confirmed by XRD analysis. FTIR spectra confirmed the chemical changes in Scots pine sapwood induced by alkalization. Brinell hardness test showed that the hardness of the modified wood increased with the highest value (44% increase in hardness) obtained for 10% Na2SiO3–nTiO2 modified wood. The results showed good correlation between TG and flammability test; limiting oxygen index (LOI) values for the wood–inorganic composites increased by 9–14% compared to the untreated wood.

Place, publisher, year, edition, pages
Royal Society of Chemistry, 2019
National Category
Wood Science Other Mechanical Engineering
Research subject
Wood Science and Engineering
Identifiers
urn:nbn:se:ltu:diva-76014 (URN)10.1039/c9ra05200c (DOI)
Funder
Swedish Research Council Formas, 2018-01198
Note

Validerad;2019;Nivå 2;2019-09-18 (johcin)

Available from: 2019-09-16 Created: 2019-09-16 Last updated: 2019-10-08Bibliographically approved
Raudoniene, J., Skaudzius, R., Zarkov, A., Selskis, A., Karlsson, O., Kareiva, A. & Garskaite, E. (2019). Wet-chemistry synthesis of shape-controlled Ag3PO4 crystals and their 3D surface reconstruction from SEM imagery. Powder Technology, 345, 26-34
Open this publication in new window or tab >>Wet-chemistry synthesis of shape-controlled Ag3PO4 crystals and their 3D surface reconstruction from SEM imagery
Show others...
2019 (English)In: Powder Technology, ISSN 0032-5910, E-ISSN 1873-328X, Vol. 345, p. 26-34Article in journal (Refereed) Published
Abstract [en]

A simple chemical solution-based synthesis route has been developed to prepare uniform and shape-controllable Ag3PO4 crystals. Tetrapod- and cube-shaped crystals having a size of about 9–10 μm were prepared from AgNO3 and NH4H2PO4 precursors, and pseudo-octahedral (equiaxial) crystals were prepared from AgNO3 and (NH4)2HPO4. TEM analysis revealed Ag3PO4 crystals to be electron beam sensitive materials, which under a voltage of 200 kV decompose to the metallic Ag, thereby demonstrating the difficulty in determining crystal facets and structural defects using conventional electron diffraction studies. UV–Vis diffuse reflectance spectroscopy was used to study the correlation between structural and optical properties of surfaces of Ag3PO4 crystals. Furthermore, a spatial 3-dimentional (3D) reconstruction of Ag3PO4 surface structures was performed from SEM images. The reconstruction produced realistic 3D mesh models, insomuch that the 3D reconstructed structures provided extra information about the examined crystals. Results suggested that the proposed synthesis route and performed spatial reconstruction of Ag3PO4 had the potential for simulating processing conditions to produce various microcrystals and explore material surface structures and reconstruction of microstructures.

Place, publisher, year, edition, pages
Elsevier, 2019
Keywords
Silver orthophosphate, Crystals, Precipitation, SEM, 3D view reconstruction, (structure-from-motion) SfM
National Category
Other Materials Engineering Materials Chemistry
Research subject
Wood Science and Engineering
Identifiers
urn:nbn:se:ltu:diva-72418 (URN)10.1016/j.powtec.2018.12.091 (DOI)000463122300003 ()2-s2.0-85059340981 (Scopus ID)
Note

Validerad;2019;Nivå 2;2019-01-11 (svasva)

Available from: 2018-12-30 Created: 2018-12-30 Last updated: 2019-04-17Bibliographically approved
Myronycheva, O., Karlsson, O., Sehlstedt-Persson, M., Öhman, M. & Sandberg, D. (2018). Distribution of low-molecular lipophilic extractives beneath the surface of air- and kiln-dried Scots pine sapwood boards. PLoS ONE, 13(10), Article ID e0204212.
Open this publication in new window or tab >>Distribution of low-molecular lipophilic extractives beneath the surface of air- and kiln-dried Scots pine sapwood boards
Show others...
2018 (English)In: PLoS ONE, ISSN 1932-6203, E-ISSN 1932-6203, Vol. 13, no 10, article id e0204212Article in journal (Refereed) Published
Abstract [en]

During industrial wood drying, extractives migrate towards the wood surfaces and make the material more susceptible to photo/biodegradation. The present work provides information about the distribution, quantity and nature of lipophilic substances beneath the surface in air- and kiln-dried Scots pine (Pinus sylvestris L.) sapwood boards. Samples were taken from knot-free sapwood surfaces and the composition of lipophilic extractives, phenols and low-molecular fatty/resin acids layers at different nominal depths below the surface was studied gravimetrically, by UV-spectrometry and by gas chromatography-mass spectrometry (GC-MS). The concentration of total extractives was significantly higher in kiln-dried than in air-dried samples and was higher close to the surface than in the layers beneath. The scatter in the values for the lipophilic extractives was high in both drying types, being highest for linoleic acid and slightly lower for palmitic, oleic and stearic acids. The amount of fatty acids was low in kiln-dried boards, probably due to a stronger degradation due to the high temperature employed. The most abundant resin acid was dehydroabietic acid followed by pimaric, isopimaric, and abietic acids in both drying types. It is concluded that during kiln-drying a migration front is created at a depth of 0.25 mm with a thickness of about 0.5 mm.

Place, publisher, year, edition, pages
PLOS, 2018
National Category
Wood Science Other Mechanical Engineering
Research subject
Wood Science and Engineering
Identifiers
urn:nbn:se:ltu:diva-71200 (URN)10.1371/journal.pone.0204212 (DOI)000446921100033 ()30303988 (PubMedID)2-s2.0-85054716404 (Scopus ID)
Projects
Experimental studies of capillary phenomena in bio-based materialsFungal growth on modified wood-based products under subarctic conditionsModWoodLifeUnderstanding wood modification through an integrated scientific and environmental impact approach
Funder
Swedish Research Council
Note

Validerad;2018;Nivå 2;2018-10-29 (svasva)

Available from: 2018-10-13 Created: 2018-10-13 Last updated: 2019-06-14Bibliographically approved
Myronycheva, O., Sehlstedt-Persson, M., Karlsson, O. & Sandberg, D. (2018). Growth of mold and rot fungi on copper-impregnated Scots pine sapwood: Influence of planing depth and inoculation pattern.. BioResources, 13(4), 8787-8801
Open this publication in new window or tab >>Growth of mold and rot fungi on copper-impregnated Scots pine sapwood: Influence of planing depth and inoculation pattern.
2018 (English)In: BioResources, ISSN 1930-2126, E-ISSN 1930-2126, Vol. 13, no 4, p. 8787-8801Article in journal (Refereed) Published
Abstract [en]

The biocidal properties of an industrially used copper-based preservative were evaluated at different planing depths on exposure of pine wood to mold fungi in direct and indirect contamination methods, with simultaneous verification of white rot fungi virulence on wood. The preservative was an aqueous solution of copper carbonate, 2-aminoethanol, and quaternary ammonium compounds. Full cell preservative impregnation efficiency against visual mold fungi growth was tested on sapwood surfaces planed to different depths before impregnation. The virulence of two white rot fungal strains of Trametes versicolor (441 and JPEI) against the dried non-impregnated and impregnated wood samples was also tested. The unplaned surface of impregnated timber was occupied by air-borne contaminants, such as Paecilomyces variottiand Aspergillus niger up to 30%, and, even after impregnation it was necessary to process the surface to avoid micro-fungi settlement. The virulence of the tested rot fungi strains was confirmed by the aggressive degradation of non-impregnated wood with a mass loss of over 40%. Both Trametes sp. strains degraded the preservative-impregnated wood with a mass loss of 3.1% to 4.8%, but degradation by the JPEI strain was more intensive and more dependent on planing depth than the other strain (441).

Place, publisher, year, edition, pages
North Carolina State University, 2018
National Category
Wood Science Other Mechanical Engineering
Research subject
Wood Science and Engineering
Identifiers
urn:nbn:se:ltu:diva-71285 (URN)10.15376/biores.13.4.8787-8801 (DOI)000454215100118 ()2-s2.0-85056570471 (Scopus ID)
Note

Validerad;2018;Nivå 2;2018-10-30 (svasva)

Available from: 2018-10-19 Created: 2018-10-19 Last updated: 2019-01-29Bibliographically approved
Myronycheva, O., Karlsson, O., Sehlstedt-Persson, M., Hagman, O., Sidorova, E. & Sandberg, D. (2018). Hyperspectral Imaging Surface Analysis for Dried and Thermally Modified Wood: An Exploratory Study. Journal of Spectroscopy, Article ID 7423501.
Open this publication in new window or tab >>Hyperspectral Imaging Surface Analysis for Dried and Thermally Modified Wood: An Exploratory Study
Show others...
2018 (English)In: Journal of Spectroscopy, ISSN 2314-4920, E-ISSN 2314-4939, article id 7423501Article in journal (Refereed) Published
Abstract [en]

Naturally seasoned, kiln-dried, and thermally modified wood has been studied by hyperspectral near-infrared imaging between 980 and 2500 nm in order to obtain spatial chemical information. Evince software was used to explore, preprocess, and analyse spectral data from image pixels and link these data to chemical information via spectral wavelength assignment. A PCA model showed that regions with high absorbance were related to extractives with phenolic groups and aliphatic hydrocarbons. The sharp wavelength band at 2135 nm was found by multivariate analysis to be useful for multivariate calibration. This peak represents the largest variation that characterizes the knot area and can be related to areas in wood rich in hydrocarbons and phenol, and it can perhaps be used for future calibration of other wood surfaces. The discriminant analysis of thermally treated wood showed the strongest differentiation between the planed and rip-cut wood surfaces and a fairly clear discrimination between the two thermal processes. The wavelength band at 2100 nm showed the greatest difference and may correspond to stretching of C=O-O of polymeric acetyl groups, but this requires confirmation by chemical analysis.

Place, publisher, year, edition, pages
Hindawi Publishing Corporation, 2018
National Category
Wood Science
Research subject
Wood Science and Engineering
Identifiers
urn:nbn:se:ltu:diva-71584 (URN)10.1155/2018/7423501 (DOI)2-s2.0-85057402277 (Scopus ID)
Note

Validerad;2018;Nivå 2;2018-11-20 (svasva)

Available from: 2018-11-14 Created: 2018-11-14 Last updated: 2019-06-14Bibliographically approved
Myronycheva, O., Bandura, I., Bisko, N., Grygansky, A. . & Karlsson, O. (2017). Assessment of the Growth and Fruiting of 19 Oyster Mushroom Strains for Indoor Cultivation on Lignocellulosic Wastes. BioResources, 12(3), 4606-4626
Open this publication in new window or tab >>Assessment of the Growth and Fruiting of 19 Oyster Mushroom Strains for Indoor Cultivation on Lignocellulosic Wastes
Show others...
2017 (English)In: BioResources, ISSN 1930-2126, E-ISSN 1930-2126, Vol. 12, no 3, p. 4606-4626Article in journal (Refereed) Published
Abstract [en]

AbstractTwelve Pleurotus ostreatus (Jacq. ex Fr.) P. Kumm and six Pleurotus pulmonarius (Fr.) Quél. strains were characterized from the National Culture Collection of Mushrooms, Institute of Botany Kholodny, National Academy of Science, Kyiv, Ukraine (IBK). The strains were grown under commercial conditions on a mixture of wheat straw and sunflower shells under both winter and summer temperatures typical for those climatic conditions. The strains were divided into three groups according to their growing patterns. Important characteristics were compared with a commercial analogue, HK-35, such as vegetative growth, generative growth, and biological efficiency (1.9- to 3.1-fold), and were recorded for strains 2251, 2292, 2316, 2319, and 2320 of P. ostreatus and 2314 of P. pulmonarius. Strains 2251, 2292, 2301, 2321 and 2323 were the most suitable for commercial production, while strains 2319 and 2320 could satisfy processing industry requirements with their high biological efficiency. Strains 2287 and 2317 produced high-quality fruit bodies but probably required a higher temperature for cultivation. Strain 2318 might be attractive for some consumers due to its unique and unusual fruit body shape. Strain 2314 was the most promising for summer cultivation, while strain 537 produced the highest quality fruit bodies.KeywordsOyster mushroom; Strain; Vegetative growth; Fruit body; Biological efficiency; Conversion Factor (CF); Asymmetry of the Fruit Body Cap (Cas)

Place, publisher, year, edition, pages
North Carolina State University, 2017
National Category
Agricultural and Veterinary sciences Other Mechanical Engineering
Research subject
Wood Science and Engineering
Identifiers
urn:nbn:se:ltu:diva-63345 (URN)10.15376/biores.12.3.4606-4626 (DOI)000408497700008 ()2-s2.0-85026736554 (Scopus ID)
Note

Validerad; 2017; Nivå 2; 2017-05-17 (andbra)

Available from: 2017-05-13 Created: 2017-05-13 Last updated: 2018-07-10Bibliographically approved
Hemmilä, V., Adamopoulos, S., Karlsson, O. & Kumar, A. (2017). Development of sustainable bio-adhesives for engineered wood panels: A Review. RSC Advances, 7(61), 38604-38630
Open this publication in new window or tab >>Development of sustainable bio-adhesives for engineered wood panels: A Review
2017 (English)In: RSC Advances, ISSN 2046-2069, E-ISSN 2046-2069, Vol. 7, no 61, p. 38604-38630Article in journal (Refereed) Published
Abstract [en]

Changes in both formaldehyde legislations and voluntary requirements (e.g. Germany RAL) are currently the driving factors behind research on alternatives to amino-based adhesives; moreover, consumer interest in healthy and sustainable products is increasing in bio-based adhesives. Sources of formaldehyde emissions in wood-based panels as well as different emission test methods have been discussed, and the main focus of this review is on the research conducted on sustainable bio-based adhesive systems for wood panels. Lignin, tannin, protein, and starch have been evaluated as both raw materials and adhesive alternatives to existing amino-based thermosetting adhesives. Adhesion improving modifications of these bio-based raw materials as well as the available and experimental crosslinkers have also been taken into account.

Place, publisher, year, edition, pages
Royal Society of Chemistry, 2017
National Category
Other Mechanical Engineering
Research subject
Wood Science and Engineering
Identifiers
urn:nbn:se:ltu:diva-65017 (URN)10.1039/C7RA06598A (DOI)000407442000059 ()2-s2.0-85027223659 (Scopus ID)
Note

Validerad;2017;Nivå 2;2017-08-14 (rokbeg)

Available from: 2017-08-11 Created: 2017-08-11 Last updated: 2018-07-10Bibliographically approved
Cristescu, C., Sandberg, D. & Karlsson, O. (2017). Markers of quality in self-bonded beech boards. In: : . Paper presented at IRG48 Scientific Conference on Wood Protection, Ghent, Belgium, June 4-8. Stockholm: IRG Secretariat
Open this publication in new window or tab >>Markers of quality in self-bonded beech boards
2017 (English)Conference paper, Published paper (Refereed)
Abstract [en]

A self-bonding phenomenon takes place when five layers of beech (Fagus SylvaticaL.) veneers are pressed at temperatures higher than 200ºC. If the pressing temperature between veneer surfaces reaches at least 225ºC during pressing and if the pressure applied is optimal, water-resistant bonds are formed between veneers. This study investigates the relation of thickness reduction (marker of compression) and mass loss (marker of heat treatment intensity) to boards quality. The effect of water and water vapour on the bondings between veneer in boards pressed at 200, 225 and 250ºC is studied. The conclusion is that pressing 5 layers of 2 mm rotary-cut beech veneer parallel-fibered at 225ºC, 5 MPa and 300 s leads to a thickness reduction of 33.4 % and mass loss of 1.23 %; in such boards bondings are not resistant to liquid water but are resistant to vapour after one adsorption-desorption cycle. When pressing at 250ºC, 5 MPa and 300 seconds, the thickness reduction is 50% and the mass loss 4%; in such boards no delamination was observed when soaked in water. Boards pressed athigher temperature show lower hygroscopicity. Their equilibrium moisture content (EMC) rangedbetween 3.6 and 7%. Based on the results of this study it ishypothesised that the decay resistance of self-bonded boards will increase when increasing the severity of the hot-pressing.

Place, publisher, year, edition, pages
Stockholm: IRG Secretariat, 2017
Series
Proceedings IRG Annua l Meeting, ISSN 2000-8953
National Category
Wood Science Other Mechanical Engineering
Research subject
Wood Science and Engineering
Identifiers
urn:nbn:se:ltu:diva-64883 (URN)
Conference
IRG48 Scientific Conference on Wood Protection, Ghent, Belgium, June 4-8
Available from: 2017-07-16 Created: 2017-07-16 Last updated: 2017-11-24Bibliographically approved
Organisations
Identifiers
ORCID iD: ORCID iD iconorcid.org/0000-0002-7711-9267

Search in DiVA

Show all publications