Pub Date : 2022-08-11DOI: 10.37763/wr.1336-4561/67.4.671685
J. Gigac, M. Fišerová, Radko Tiňo
The effect of surface roughness and water contact angle of commercial paperboard before and after surface modification by calendering, coating and calendering and plasma treatment on the functionality of UHF RFID antennas printed with thermal transfer aluminum ribbon was evaluated. A hydrophilic surface was created by coating or plasma treatment, which improved the wettability of the paperboard surface, the spreading of the thermoplastic tie layer and theadhesion of the conductive aluminum layer. Anew paper product was created with permanent surface wettability by coating, without theneed for plasmatreatment before printing. Theplasma treatment provided time-limited wettability, needed only during printing, and made it possible to restore the original hydrophobic surface of thepaperboard. In addition to themeaning of these surface modifications, the importance and need to reduce the surface roughness was confirmed, as the higher surface roughness of the paperboard limited the effect of the plasma treatment in terms of its printability and the functionality of the printed aluminum antenna. The printability of the paperboard and the functionality of the printed antennas were evaluated using electrical conductivity. The electrical conductivities of the dipole and inductor loop of the UHF RFID antennas printed on modified paperboards varied depending on theantenna design.
{"title":"EFFECT OF PAPERBOARD SURFACE MODIFICATIONS ON ELECTRICAL CONDUCTIVITY OF PRINTED UHF RFID ANTENNAS","authors":"J. Gigac, M. Fišerová, Radko Tiňo","doi":"10.37763/wr.1336-4561/67.4.671685","DOIUrl":"https://doi.org/10.37763/wr.1336-4561/67.4.671685","url":null,"abstract":"The effect of surface roughness and water contact angle of commercial paperboard before and after surface modification by calendering, coating and calendering and plasma treatment on the functionality of UHF RFID antennas printed with thermal transfer aluminum ribbon was evaluated. A hydrophilic surface was created by coating or plasma treatment, which improved the wettability of the paperboard surface, the spreading of the thermoplastic tie layer and theadhesion of the conductive aluminum layer. Anew paper product was created with permanent surface wettability by coating, without theneed for plasmatreatment before printing. Theplasma treatment provided time-limited wettability, needed only during printing, and made it possible to restore the original hydrophobic surface of thepaperboard. In addition to themeaning of these surface modifications, the importance and need to reduce the surface roughness was confirmed, as the higher surface roughness of the paperboard limited the effect of the plasma treatment in terms of its printability and the functionality of the printed aluminum antenna. The printability of the paperboard and the functionality of the printed antennas were evaluated using electrical conductivity. The electrical conductivities of the dipole and inductor loop of the UHF RFID antennas printed on modified paperboards varied depending on theantenna design.","PeriodicalId":329192,"journal":{"name":"WOOD RESEARCH 67(4) 2022","volume":"10 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-08-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133022895","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-08-11DOI: 10.37763/wr.1336-4561/67.4.636647
Sefa Durmaz, Özlem Özgenç
In this study, the wood flour content's effect on the weathering performance of flat pressed WPC was investigated. The high density polyethylene was reinforced with four different wood flour content (10%, 30%, 50%, 70%). The weathering performance of WPC was determinedby the 400 h of artificial weathering test. According to the results, the color change is inevitable aslong as the wood flour is used as filler. Surprisingly, the highest color change was obtained from WPC containing 30% WF, contrary to 70% of wood flour. Similarly, the whiteness of thesurface of WPC increased with exposure time. The photooxidation resulted in the chain scission and shorter molecules, which were observed by ATR-FTIR analysis. The changes in the intensity of characteristic polymer (2914 cm-1and 2846 cm-1) and wood peaks (1510 cm-1and 1027 cm-1) exhibited the photodegradation on WPCs' surface, which resulted in color change. Moreover, the light microscopy investigation showed surface degradation. Theextensive weathering conditions causedsurface cracks and surface roughness. The visual appearance of WPCs also demonstrated how to change the surface character of WPC during the400 h of artificial weathering. In conclusion, the increase inthe wood content increased theintensity of degradation.
{"title":"THE CHANGES IN THE SURFACE OF FLAT PRESSED WOOD-PLASTIC COMPOSITES EXPOSED TO ARTIFICIAL WEATHERING","authors":"Sefa Durmaz, Özlem Özgenç","doi":"10.37763/wr.1336-4561/67.4.636647","DOIUrl":"https://doi.org/10.37763/wr.1336-4561/67.4.636647","url":null,"abstract":"In this study, the wood flour content's effect on the weathering performance of flat pressed WPC was investigated. The high density polyethylene was reinforced with four different wood flour content (10%, 30%, 50%, 70%). The weathering performance of WPC was determinedby the 400 h of artificial weathering test. According to the results, the color change is inevitable aslong as the wood flour is used as filler. Surprisingly, the highest color change was obtained from WPC containing 30% WF, contrary to 70% of wood flour. Similarly, the whiteness of thesurface of WPC increased with exposure time. The photooxidation resulted in the chain scission and shorter molecules, which were observed by ATR-FTIR analysis. The changes in the intensity of characteristic polymer (2914 cm-1and 2846 cm-1) and wood peaks (1510 cm-1and 1027 cm-1) exhibited the photodegradation on WPCs' surface, which resulted in color change. Moreover, the light microscopy investigation showed surface degradation. Theextensive weathering conditions causedsurface cracks and surface roughness. The visual appearance of WPCs also demonstrated how to change the surface character of WPC during the400 h of artificial weathering. In conclusion, the increase inthe wood content increased theintensity of degradation.","PeriodicalId":329192,"journal":{"name":"WOOD RESEARCH 67(4) 2022","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-08-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125776993","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-08-11DOI: 10.37763/wr.1336-4561/67.4.598611
Mario Núñez-Decap, Gustavo PÉREZ-SOTO, A. Opazo-Vega, Boris Moya-Rojas, Marcela Vidal-Vega
The aim of this research was study of polyurethane (PUR), isocyanate polymer emulsions (EPI) and melamine-urea-formaldehyde (MUF) adhesives, on the bonding properties of solid and hollow glulam beams of Pinus radiata. The thermomechanical analysis (DMA) of theadhesives was carried out to evaluate their stiffness and reactivity. Glulam beams were evaluated by a bending test. The quality of the bonding was evaluated by resistance to shear anddelamination. The morphology of the bonding was studied by microscopy. The DMA study showed that the MUF adhesive had the highest level of stiffness and reactivity. The results of the bending test showed that the highest modulus of rupture results were obtained in solid and hollow laminated beams with MUF adhesive, achieving increases of 30% over the PUR adhesive. The lowest delamination results were obtained in solid glulam beams with MUF and EPI adhesives, while the highest results were 32% and 47% for the PUR adhesive. Finally, glulam beams manufactured with MUF adhesive presented the best performance and results.
{"title":"STUDY OF WOOD ADHESIVES ON THE BONDING PROPERTIES IN SOLID AND HOLLOW GLULAM BEAMS OF PINUS RADIATA","authors":"Mario Núñez-Decap, Gustavo PÉREZ-SOTO, A. Opazo-Vega, Boris Moya-Rojas, Marcela Vidal-Vega","doi":"10.37763/wr.1336-4561/67.4.598611","DOIUrl":"https://doi.org/10.37763/wr.1336-4561/67.4.598611","url":null,"abstract":"The aim of this research was study of polyurethane (PUR), isocyanate polymer emulsions (EPI) and melamine-urea-formaldehyde (MUF) adhesives, on the bonding properties of solid and hollow glulam beams of Pinus radiata. The thermomechanical analysis (DMA) of theadhesives was carried out to evaluate their stiffness and reactivity. Glulam beams were evaluated by a bending test. The quality of the bonding was evaluated by resistance to shear anddelamination. The morphology of the bonding was studied by microscopy. The DMA study showed that the MUF adhesive had the highest level of stiffness and reactivity. The results of the bending test showed that the highest modulus of rupture results were obtained in solid and hollow laminated beams with MUF adhesive, achieving increases of 30% over the PUR adhesive. The lowest delamination results were obtained in solid glulam beams with MUF and EPI adhesives, while the highest results were 32% and 47% for the PUR adhesive. Finally, glulam beams manufactured with MUF adhesive presented the best performance and results.","PeriodicalId":329192,"journal":{"name":"WOOD RESEARCH 67(4) 2022","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-08-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129074758","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-08-11DOI: 10.37763/wr.1336-4561/67.4.582597
Saiyin Fang, Ming Li, Tingting Deng, Kund Du
To study the propagation law of acoustic emission (AE) longitudinal waves in wood, therelationship among wave velocity, standing wave fundamental frequency and Young's modulus of elasticity was studied, and the energy decay model of AE longitudinal waves along the grain direction was established. Firstly, the propagation velocity of the longitudinal wave was calculated using the time-difference method. Then, the relationship between the wave velocity and Young's modulus of elasticity was analyzed and the method of calculating thelongitudinal wave velocity using the fundamental frequency was proposed. Finally, using different levels' pulse strings as AE sources, the attenuation law of AE signal energy with distance was studied. The results show that the longitudinal wave velocity can be estimated more accurately by using the standing wave fundamental frequency. The influence of Poisson's ratio needs to be considered when calculating the Young's modulus of elasticity by using thelongitudinal wave velocity.
{"title":"STUDY ON THE TIME-FREQUENCY CHARACTERISTICS AND PROPAGATION LAW OF ACOUSTIC EMISSION LONGITUDINAL WAVES IN WOOD GRAIN DIRECTION","authors":"Saiyin Fang, Ming Li, Tingting Deng, Kund Du","doi":"10.37763/wr.1336-4561/67.4.582597","DOIUrl":"https://doi.org/10.37763/wr.1336-4561/67.4.582597","url":null,"abstract":"To study the propagation law of acoustic emission (AE) longitudinal waves in wood, therelationship among wave velocity, standing wave fundamental frequency and Young's modulus of elasticity was studied, and the energy decay model of AE longitudinal waves along the grain direction was established. Firstly, the propagation velocity of the longitudinal wave was calculated using the time-difference method. Then, the relationship between the wave velocity and Young's modulus of elasticity was analyzed and the method of calculating thelongitudinal wave velocity using the fundamental frequency was proposed. Finally, using different levels' pulse strings as AE sources, the attenuation law of AE signal energy with distance was studied. The results show that the longitudinal wave velocity can be estimated more accurately by using the standing wave fundamental frequency. The influence of Poisson's ratio needs to be considered when calculating the Young's modulus of elasticity by using thelongitudinal wave velocity.","PeriodicalId":329192,"journal":{"name":"WOOD RESEARCH 67(4) 2022","volume":"2 4","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-08-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133971160","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-08-11DOI: 10.37763/wr.1336-4561/67.4.545557
Yan Yang, Xiaoqiang Zhang, Qian Xu, Peiyang Wang, Shilong Jiang, Yan Min, Wen Sun, Bin Li, Yulong Fan, Shuang Yang
In order to classify the decay levels of Chinese fir (Cunninghamia lanceolata) wood components in arcade buildings in the ancient town Chikan and to provide basic data for future protection measures, the extent of decay of the samples was determined via polarized light, fluorescence, and Fourier-transform infrared spectroscopy. The results were as follows: (1)Thetotal birefringence brightness of crystalline cellulose and the green fluorescence brightness of the lignins were reducedto different degreesin almost all samples. (2)Theabsorption peaks at 1731 cm-1representing hemicellulose and at 891 cm-1representing cellulose in all samples disappeared. The absorption peak heights at 1370 cm-1, 1159 cm-1and 1058 cm-1which represents holocellulose,and at 1508 cm-1, 1424 cm-1, and 1262 cm-1which represents lignin decreased to varying degrees. (3)From the analysis, the decay level of wooden components in arcade buildings was divided into three classes, i.e., Level I (severe decay), Level II (moderate decay), and Level III (mild decay).
{"title":"EVALUATION OF THE DECAY LEVELS OF WOODEN COMPONENTS IN ARCADE BUILDINGS IN THE ANCIENT TOWN CHIKAN VIA POLARIZED LIGHT, FLUORESCENCE AND FTIR SPECTRA","authors":"Yan Yang, Xiaoqiang Zhang, Qian Xu, Peiyang Wang, Shilong Jiang, Yan Min, Wen Sun, Bin Li, Yulong Fan, Shuang Yang","doi":"10.37763/wr.1336-4561/67.4.545557","DOIUrl":"https://doi.org/10.37763/wr.1336-4561/67.4.545557","url":null,"abstract":"In order to classify the decay levels of Chinese fir (Cunninghamia lanceolata) wood components in arcade buildings in the ancient town Chikan and to provide basic data for future protection measures, the extent of decay of the samples was determined via polarized light, fluorescence, and Fourier-transform infrared spectroscopy. The results were as follows: (1)Thetotal birefringence brightness of crystalline cellulose and the green fluorescence brightness of the lignins were reducedto different degreesin almost all samples. (2)Theabsorption peaks at 1731 cm-1representing hemicellulose and at 891 cm-1representing cellulose in all samples disappeared. The absorption peak heights at 1370 cm-1, 1159 cm-1and 1058 cm-1which represents holocellulose,and at 1508 cm-1, 1424 cm-1, and 1262 cm-1which represents lignin decreased to varying degrees. (3)From the analysis, the decay level of wooden components in arcade buildings was divided into three classes, i.e., Level I (severe decay), Level II (moderate decay), and Level III (mild decay).","PeriodicalId":329192,"journal":{"name":"WOOD RESEARCH 67(4) 2022","volume":"6 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-08-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123320065","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-08-11DOI: 10.37763/wr.1336-4561/67.4.686699
Zihao Liu, Sulan Zhang, Xiaojun Jia, Jun Yang
Traditionally, HLAC (Higher-order Local Auto-Correlation) algorithm was used to extract texture features of wood images. However, heavy memory consumption and complexity of high-order mask pattern were common in HLAC. A novel feature extraction strategy based on improved blocked higher-order local auto-correlation (IBHLAC) is proposed to circumvent these problems. Initially, sequences of the whole wood image frames, which are the grayscale treatment, were being divided into series of subdivisions vertically and horizontally. Additionally,to enhance auto-correlation ability of the proposed method, different high-order patterns of masks were rebuilt based on zero-order mask by introducing the morphology and affine transformation. Finally, time-consumption and memory occupation of related four methods were compared. Experiment results indicated IBHLAC costs less time and fewer memory consumption on the wood texture database compared with other methods, which reveal that IBHLAC is efficient.
传统的木材图像纹理特征提取方法是采用HLAC (high -order Local Auto-Correlation)算法。然而，高阶掩模模式的复杂性和内存消耗大是HLAC中常见的问题。为了克服这些问题，提出了一种基于改进阻塞高阶局部自相关(IBHLAC)的特征提取策略。最初，整个木材图像帧的序列，即灰度处理，被垂直和水平划分为一系列细分。此外，为了增强该方法的自相关能力，通过引入形态学和仿射变换，在零阶掩模的基础上重建了不同的高阶掩模模式。最后比较了相关四种方法的耗时和内存占用情况。实验结果表明，与其他方法相比，IBHLAC在木材纹理数据库上花费的时间和内存消耗更少，表明IBHLAC是有效的。
{"title":"A NOVEL WOOD FEATURE EXTRACTION METHOD BASED ON IMPROVED BLOCKED HIGHER-ORDER LOCAL AUTO-CORRELATION","authors":"Zihao Liu, Sulan Zhang, Xiaojun Jia, Jun Yang","doi":"10.37763/wr.1336-4561/67.4.686699","DOIUrl":"https://doi.org/10.37763/wr.1336-4561/67.4.686699","url":null,"abstract":"Traditionally, HLAC (Higher-order Local Auto-Correlation) algorithm was used to extract texture features of wood images. However, heavy memory consumption and complexity of high-order mask pattern were common in HLAC. A novel feature extraction strategy based on improved blocked higher-order local auto-correlation (IBHLAC) is proposed to circumvent these problems. Initially, sequences of the whole wood image frames, which are the grayscale treatment, were being divided into series of subdivisions vertically and horizontally. Additionally,to enhance auto-correlation ability of the proposed method, different high-order patterns of masks were rebuilt based on zero-order mask by introducing the morphology and affine transformation. Finally, time-consumption and memory occupation of related four methods were compared. Experiment results indicated IBHLAC costs less time and fewer memory consumption on the wood texture database compared with other methods, which reveal that IBHLAC is efficient.","PeriodicalId":329192,"journal":{"name":"WOOD RESEARCH 67(4) 2022","volume":"32 12 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-08-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124539148","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-08-11DOI: 10.37763/wr.1336-4561/67.4.700707
Oussama Chauiyakh, Samar Aarabi, Oumaima Ninich, E. El Fahime, F. Bentata, A. Et-tahir
Our study is interested in isolating fungi from the wood parts of cedar trunks withered and identifying these lignivorous fungi. A sample was isolated from the cedar grove of Tazekka National Park located south of the city of Taza in Morocco. The culture and purification of theisolated fungus were done on a water agar medium and then on a PDA medium. Afterthepurification of the fungus, a morphological study by electron microscope allowed us to identify the pathogen Pleurostoma richardsiae. A molecular characterization confirmed these results with a coverage percentage of 97% and an identity of 99%. To our knowledge, this is thefirst report of P. richardsiaein decayed cedar wood.
{"title":"SHORT NOTES: FIRST REPORT OF THE LIGNIVOROUS FUNGUS PLEUROSTOMA RICHARDSIAE IN CEDRUS ATLANTICA M. IN MOROCCO","authors":"Oussama Chauiyakh, Samar Aarabi, Oumaima Ninich, E. El Fahime, F. Bentata, A. Et-tahir","doi":"10.37763/wr.1336-4561/67.4.700707","DOIUrl":"https://doi.org/10.37763/wr.1336-4561/67.4.700707","url":null,"abstract":"Our study is interested in isolating fungi from the wood parts of cedar trunks withered and identifying these lignivorous fungi. A sample was isolated from the cedar grove of Tazekka National Park located south of the city of Taza in Morocco. The culture and purification of theisolated fungus were done on a water agar medium and then on a PDA medium. Afterthepurification of the fungus, a morphological study by electron microscope allowed us to identify the pathogen Pleurostoma richardsiae. A molecular characterization confirmed these results with a coverage percentage of 97% and an identity of 99%. To our knowledge, this is thefirst report of P. richardsiaein decayed cedar wood.","PeriodicalId":329192,"journal":{"name":"WOOD RESEARCH 67(4) 2022","volume":"33 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-08-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115496985","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-08-11DOI: 10.37763/wr.1336-4561/67.4.625635
Isabella Silva Menezes, I. F. Fraga, Matheus Henrique MORATO DE MORAES, A. Christoforo, Fernando Júnior RESENDE MASCARENHAS, Raquel SCHMITT CAVALHEIRO, F. A. Rocco Lahr, E. Chahud, Luiz Antônio Melgaço Nunes Branco, Herisson Ferreira dos Santos
In Brazil, some tile manufacturers have proposed a 10% (5.5°) slope between chords to minimize timber consumption. However, after simulating 21 slopes from 7% (4°) to 27% (15°), it was discovered that the axial strengths are inversely proportional to the slope, creating overly large dimensions for the bars competing for support. The results were obtained using software developed following the guidelines specified in the revised version of the ABNT NBR 7190 (2022) standard. Finally, it was found that the minimum slope until no reinforcement is needed for the string bars is 16% (9°).
{"title":"EMPIRICAL ANALYSIS OF ROOF SLOPE INFLUENCE ON MATERIAL CONSUMPTION IN TIMBER HOWE-TYPE TRUSSES","authors":"Isabella Silva Menezes, I. F. Fraga, Matheus Henrique MORATO DE MORAES, A. Christoforo, Fernando Júnior RESENDE MASCARENHAS, Raquel SCHMITT CAVALHEIRO, F. A. Rocco Lahr, E. Chahud, Luiz Antônio Melgaço Nunes Branco, Herisson Ferreira dos Santos","doi":"10.37763/wr.1336-4561/67.4.625635","DOIUrl":"https://doi.org/10.37763/wr.1336-4561/67.4.625635","url":null,"abstract":"In Brazil, some tile manufacturers have proposed a 10% (5.5°) slope between chords to minimize timber consumption. However, after simulating 21 slopes from 7% (4°) to 27% (15°), it was discovered that the axial strengths are inversely proportional to the slope, creating overly large dimensions for the bars competing for support. The results were obtained using software developed following the guidelines specified in the revised version of the ABNT NBR 7190 (2022) standard. Finally, it was found that the minimum slope until no reinforcement is needed for the string bars is 16% (9°).","PeriodicalId":329192,"journal":{"name":"WOOD RESEARCH 67(4) 2022","volume":"20 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-08-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125307710","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-08-11DOI: 10.37763/wr.1336-4561/67.4.533544
D. Jokanović, T. Ćirković-Mitrović, Vesna Nikolić Jokanović, R. Lozjanin
The paper deals with anatomical characteristics of wood fibres of Quercus robur L. Fiber length, double-cell wall thickness and fiber lumen diameter were analysed from samples in flooded and non-flooded area along Sava river in Serbia. All anatomical elements were measured from pith to bark in order to establish variation with cambial age, not only between researched sites, but also between individuals within each locality. In this study, there was no statistically significant difference only for mean values of fiber length between individual trees at non-flooded area, and in fiber lumen diameter at flooded area. Increasing of mean values of observed anatomical parameters with cambial age is valid for flooded area (MU „Grabovako-vitojevačko ostrvo 20e“), while for another locality (MU “Blata-Malovanci”) it is the case just for double-cell wall thickness. Mean values of all analysed anatomical elements are bigger in flooded area and this could be a consequence of more suitable ecological conditions for Quercus roburL. development present in this locality. Obtained variations show nonhomogeneous wood fibre features at both localities.
本文研究了塞尔维亚萨瓦河沿岸淹水和非淹水地区栎木纤维的解剖特征，分析了其纤维长度、双细胞壁厚度和纤维腔直径。为了确定形成层年龄的变化，不仅在研究地点之间，而且在每个地方的个体之间，从髓到树皮的所有解剖元素都进行了测量。在本研究中，只有非淹水区单株间纤维长度平均值和淹水区单株间纤维管径平均值差异无统计学意义。观察到的解剖参数的平均值随形成层年龄的增加对淹水区域(MU“grabovako - vitojeva”ko ostrvo 20e)有效，而对另一个区域(MU“Blata-Malovanci”)仅对双细胞壁厚度有效。各解剖单元的平均值在洪涝地区较大，这可能是更适合栓皮栎生长的生态条件的结果。这个地区目前的发展情况。所获得的变化表明，在两个地方的木材纤维特征不均匀。
{"title":"VARIABILITY OF WOOD FIBRES OF MATURE PEDUNCULATE OAK IN FLOODED AND NON-FLOODED AREA","authors":"D. Jokanović, T. Ćirković-Mitrović, Vesna Nikolić Jokanović, R. Lozjanin","doi":"10.37763/wr.1336-4561/67.4.533544","DOIUrl":"https://doi.org/10.37763/wr.1336-4561/67.4.533544","url":null,"abstract":"The paper deals with anatomical characteristics of wood fibres of Quercus robur L. Fiber length, double-cell wall thickness and fiber lumen diameter were analysed from samples in flooded and non-flooded area along Sava river in Serbia. All anatomical elements were measured from pith to bark in order to establish variation with cambial age, not only between researched sites, but also between individuals within each locality. In this study, there was no statistically significant difference only for mean values of fiber length between individual trees at non-flooded area, and in fiber lumen diameter at flooded area. Increasing of mean values of observed anatomical parameters with cambial age is valid for flooded area (MU „Grabovako-vitojevačko ostrvo 20e“), while for another locality (MU “Blata-Malovanci”) it is the case just for double-cell wall thickness. Mean values of all analysed anatomical elements are bigger in flooded area and this could be a consequence of more suitable ecological conditions for Quercus roburL. development present in this locality. Obtained variations show nonhomogeneous wood fibre features at both localities.","PeriodicalId":329192,"journal":{"name":"WOOD RESEARCH 67(4) 2022","volume":"517 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-08-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116541123","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-08-11DOI: 10.37763/wr.1336-4561/67.4.519532
Song Chen, Xiyang Zhao, Suting Chen
This study aims to provide information on Betula pendulacell wall synthesis genes regarding their potential physiological roles and the molecular mechanism associated. Here we identified 46 gene models in 7 gene families that encode cellulose synthase and related enzymes of B. pendula, and the transcript abundance of these genes in xylem, root, leaf, and flower tissues also be determined. Based on these RNA-seq data, we have identified 8 genes that most likely participate in cell wall synthesis, which include 3 cellulose synthase genes and 5cellulose synthase-like genes. In parallel, a gene co-expression network was also constructed based on transcriptome sequencing. These analyses will help decipher the genetic information of B.pendulacell wall synthesis genes and alter its wood structureon the cellular level.
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