Biodegradation of methylxanthines by Coniophora puteana

2021 ◽  
Author(s):  
Klára Kobetičová ◽  
Jana Nábělková ◽  
Michaela Petříková ◽  
Václav Kočí ◽  
Miloš Jerman ◽  
...  
Keyword(s):  
Coniophora Puteana

Study of the properties larch and larch wood construction materials

2016 ◽  
Author(s):  
М.А. Чубинский ◽  
К.В. Чаузов
Keyword(s):  
Weight Loss ◽  
Urea Formaldehyde ◽  
Construction Materials ◽  
Siberian Larch ◽  
Larix Sibirica ◽  
Average Weight ◽  
Biological Stability ◽  
Laminated Beam ◽  
Coniophora Puteana ◽  
Larch Wood

Несмотря на огромные запасы, древесина лиственницы до сего времени в незначительных объемах используется в строительной индустрии, других отраслях экономики, что связано как с технологическими сложностями ее переработки, так и недостаточной изученностью ее свойств. Одним из уникальных свойств древесины лиственницы сибирской (Larix sibirica) является ее повышенная естественная биостойкость, наряду с максимально высокой среди отечественных хвойных пород прочностью. Стойкость древесины лиственницы (Larix sibirica) к воздействию дереворазрушающих грибов Coniofora puteana значительно превышает стойкость сосны. В среднем потеря массы ядровой древесины лиственницы сибирской под воздействием дереворазрушающего гриба Coniophora puteana составляет 14,84%, снижаясь с увеличением возраста дерева, а контрольные образцы из ядровой древесины сосны в возрасте 90 лет имели потерю массы 57,8%. Возраст дерева является одним из наиболее значимых факторов, влияющих на степень биостойкости древесины. По мере его увеличения значительно повышается устойчивость деструктивному воздействию дереворазрушающих грибов Coniophora puteana. Положение образцов также влияет на степень биостойкости древесины, однако эта зависимость слабо выражена по сравнению с влиянием возраста и плотности древесины. Исследования кинетики разложения древесины лиственницы сибирской и роли экстрактивных веществ в развитии дереворазрушающих грибов позволяют утверждать наличие связи биостойкости и содержания в древесине экстрактивных веществ. Для изготовления клееного бруса из древесины лиственницы предложена клеевая композиция, включающая карбамидомеламиноформальдегидный клей и карбамидоформальдегидную смолу, модифицированную шунгитами. Ее применение позволяет получать клеевые соединения, не уступающие по прочности при скалывании массивной древесине, как по сухому образцу, так и после его вымачивания. Таким образом, клееный брус из древесины лиственницы сибирской характеризуется высокими показателями биостойкости, прочности и водостойкости. Despite vast reserves, larch wood so far in small volumes used in the construction industry and other sectors of the economy, which is connected as the technological difficulties of its treatment, as well as insufficient knowledge of its properties. One of the unique properties of the wood of Siberian larch (Larix sibirica) is its increased natural biological stability (decay resistant), along with the highest among the domestic softwood strength. Resistance Larch (Larix sibirica) to the effects of wood-destroying fungi Coniofora puteana is much higher than pine. The average weight loss of Siberian larch heartwood exposed wood-destroying fungi Coniophora puteana is 14.84%, decreasing with increasing age of the tree, and control samples of heartwood pine at age 90 had a weight loss of 57.8%. Age of a tree is one of the most significant factors affecting the degree of biological stability of wood. With the increase it significantly increases the stability of the destructive effects of wood-destroying fungi and Coniophora puteana. The position of the sample in tree also affects the degree of biological stability of wood, but this dependence is poorly developed in comparison with the influence of age and wood density. Studies of the kinetics of decomposition of Siberian larch wood and the role of extractives in the development of wood-destroying fungi suggest a link, and the decay resistant of the content in the wood extractives. For the manufacture of larch glued laminated beam proposed adhesive composition comprising urea and melamine-formaldehyde glue and urea-formaldehyde resins, modified shungites. Its use allows to obtain the bonds are not inferior in strength at shearing solid wood as dry sample, and after soaking. Thus, glued laminated beam from Siberian larch wood is characterized by high decay resistant, strength and water resistance.

scholarly journals Characterization of the decay process of Scots pine caused by Coniophora puteana using NMR and MRI

Holzforschung ◽  
2020 ◽  
Vol 74 (11) ◽  
pp. 1021-1032 ◽  
Author(s):  
Sami Hiltunen ◽  
Arttu Mankinen ◽  
Muhammad Asadullah Javed ◽  
Susanna Ahola ◽  
Martti Venäläinen ◽  
...  
Keyword(s):  
Magnetic Resonance ◽  
Scots Pine ◽  
Structural Changes ◽  
Free Water ◽  
Wood Decay ◽  
Active Regions ◽  
Dry Mass ◽  
Decay Process ◽  
Coniophora Puteana ◽  
Magnetic Resonance Imaging Mri

AbstractWood decay is an economically significant process, as it is one of the major causes of wood deterioration in buildings. In this study, the decay process of Scots pine (Pinus sylvestris) samples caused by cellar fungus (Coniophora puteana) was followed by nuclear magnetic resonance (NMR) spectroscopy and magnetic resonance imaging (MRI) methods. Altogether, 30 wood sample pieces were exposed to fungus for 10 weeks. Based on the decrease of the dry mass, the samples were categorized into three classes: decomposed (mass decrease 50–70%), slightly decomposed (10–50%), and nondecomposed (<10%). MRI made it possible to identify the active regions of fungus inside the wood samples based on the signal of free water brought by the fungus and arisen from the decomposition of wood carbohydrates. MRI implies that free water is not only created by the decay process, but fungal hyphae also transports a significant amount of water into the sample. Two-dimensional 1H T1-T2 relaxation correlation NMR measurements provided detailed information about the changes in the microstructure of wood due to fungal decomposition. Overall, this study paves the way for noninvasive NMR and MRI detection of fungal decay at early stages as well as the related structural changes.

Biodiversity of Fungi, Causing Wood Biodeterioration In Buildings In Poland Against The Background Of Research Conducted In Other European Countries.

2021 ◽  
Author(s):  
Bogusław Adam Andres ◽  
Krzysztof J. Krajewski ◽  
Izabela Betlej
Keyword(s):  
Species Diversity ◽  
Western Europe ◽  
Residential Buildings ◽  
European Countries ◽  
Engineering Structures ◽  
Coniophora Puteana ◽  
Serpula Lacrymans

Abstract The paper presents the results of surveys on the diversity of wood-destroying fungi in buildings and wooden engineering structures outdoors in Poland. The respondents reported a total of 48 species and genus of wood-degrading Basidiomycetes. The greatest species diversity of wood-degrading fungi was found on open-air engineering structures (33 species), the second location in terms of biodiversity was unused residential buildings (30 species), the lowest biodiversity was found in the used residential buildings (21 species).The most common fungi in the buildings were Serpula lacrymans (24.8%), Coniophora puteana (14.1%) and Fibroporia vaillantii (13.8%). The prevalence of S. lacrymans and C. puteana in buildings in Poland is similar to the European average. The occurrence of indoor polypores group (Amyloporia sinuosa, Fibroporia vaillantii, Neoantrodia serialis) in Poland is twice as high as the European average. Donkioporia expansa, which is numerous in buildings in Western Europe, is sporadically recorded in Poland (0.1%).

A study of natural durability of selected coniferous wood species from north Asia affected by the fungus Coniophora puteana (Schumach.) P. Karst.

2020 ◽  
Vol 112 ◽  
pp. 32-35
Author(s):  
Boguslaw Andres ◽  
Agnieszka Jankowska ◽  
Grzegorz Duchnik
Keyword(s):  
Wood Species ◽  
Brown Rot ◽  
Larix Sibirica ◽  
Natural Durability ◽  
Pinus Sibirica ◽  
European Larch ◽  
Coniophora Puteana ◽  
North Asia ◽  
Coniferous Wood ◽  
Pinus Sibirica Du Tour

The aim of prestened study was to determine the natural durability of selected coniferous wood species from Asia to the effect of Coniophora puteana (Schumach.) P. Karst., which causes brown rot. The species tested were: Larix gmellini (Rupr.) Kuzen., Larix sibirica Ledeb. and Pinus sibirica Du Tour.. The test was conducted on the basis of PN-EN 350:2016-10 and PN-EN 113:2000. As a result of the research durability classes were determined. Wood durability of tested Asian species was compared with the domestic wood species such as Pinus sylvestris L. and Larix decidua Mill.. The most durable of the tested wood species was Larix sibirica Ledeb., while the European larch showed comparable durability. The wood of Larix gmellini (Rupr.) Kuzen. showed the lowest persistence among the tested species.

Micromorphological characteristics of decayed wood and laccase produced by the brown-rot fungus Coniophora puteana

2004 ◽  
Vol 50 (3) ◽  
pp. 281-284 ◽  
Author(s):  
Kwang Ho Lee ◽  
Seung Gon Wi ◽  
Adya P. Singh ◽  
Yoon Soo Kim
Keyword(s):  
Brown Rot ◽  
Decayed Wood ◽  
Coniophora Puteana ◽  
Brown Rot Fungus

Hybridization among cryptic species of the cellar fungus Coniophora puteana (Basidiomycota)

2006 ◽  
Vol 16 (2) ◽  
pp. 389-399 ◽  
Author(s):  
HÅVARD KAUSERUD ◽  
INGEBORG BJORVAND SVEGÅRDEN ◽  
CONY DECOCK ◽  
NILS HALLENBERG
Keyword(s):  
Cryptic Species ◽  
Coniophora Puteana
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