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Dr. Ratih Damayanti
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Research Center for Biomaterials,Indonesian Institute of Sciences Jl. Raya Bogor Km 46, Cibinong, Bogor 16911, Indonesia
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INDONESIA
Wood Research Journal : Journal of Indonesian Wood Research Society
Published by Masyarakat Peneliti Kayu Indonesia
ISSN : 20873840     EISSN : 27749320     DOI : 10.51850/wrj
Core Subject : Agriculture,
Agriculture, Biological Sciences & Forestry
Wood Research Journal is the official journal of the Indonesian Wood Research Society. This journal is an international medium in exchanging, sharing and discussing the science and technology of wood. The journal publishes original manuscripts of basic and applied research of wood science and technology related to Anatomy, Properties, Quality Enhancement, Machining, Engineering and Constructions, Panel and Composites, Entomology and Preservation, Chemistry, Non Wood Forest Products, Pulp and Papers, Biomass Energy, and Biotechnology. Besides that, this journal also publishes review manuscripts which topics are decided by the Editors.
Arjuna Subject : Ilmu Pertanian dan Biologi (Semua) - Kehutanan
Articles 137 Documents
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Molecular Identification of Decay Fungi in Xylem of Yellow Meranti (Shorea gibbosa) Canker Erwin Erwin; Shuhei Takemoto; Yuji Imamura
Wood Research Journal Vol 1, No 2 (2010): Wood Research Journal
Publisher : Masyarakat Peneliti Kayu Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.51850/wrj.2010.1.2.78-82

Abstract

By molecular technique, identification of decay fungi isolated from decayed xylem of the tree canker of yellow meranti (Shorea gibbosa) have been carried out.  In this molecular identification, the ITS (Internal Transcribed Spacers) region of rDNA of fungal isolates were amplified and sequenced. The DNA sequence for each fungus was aligned with that of known species in the ITS region of rDNA database for fungi. By phylogenetic analysis based on the sequences of the ITS region of rDNA, a basidiomycete fungi isolated from decayed xylem of yellow meranti was identified as Phlebia  brevispora. The presence of ascomycete fungi on the decayed xylem samples was also detected and identified as Aspergillus nomius, Phlogicylindrium sp., Hypocrea rufa, Hypocrea lixii, Talaromyces sp., and Trichoderma virens.
Beam-Column Timber Joint Connection Behavior Due to Nail and Modified-Washer Reinforcement Tests Yosafat Aji Pranata; Anang Kristianto; Olga Pattipawaej
Wood Research Journal Vol 10, No 1 (2019): Wood Research Journal
Publisher : Masyarakat Peneliti Kayu Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.51850/wrj.2019.10.1.6-10

Abstract

Timber connection capacity, in case of beam-column joint connection provides significant impact on the wooden building structures. Strength and stiffness of timber connections using reinforcement technique of wooden building structures have not been studied intensively. This paper studies the use of nails and modified-washer to improve wood connection’s performance. The experimental tests were conducted in the laboratory by comparing the partial connection between test specimen timber without reinforcement (standard type) and the reinforcement (PRP type). The testing was conducted based on partial connection beam-column joint test using Universal Testing Machine’s with a modified holder. Wood studied includes Meranti (Shorea spp.) and Mersawa (Anisoptera spp.). PRP type connection was using nails and modified-washer strengthening, and standard type connection was using a classic washer. Parameters studied were strength and stiffness of the connection, reviewed both: proportional limit load and ultimate limit load conditions. Result obtained from this research indicates that the use of nails and modified-washer make a positive contribution to improving the performance of the beam- column timber joint connections, in terms of strength capacity (both of proportional limit and ultimate limit loads) and stiffness capacity (displacement ductility ratio). Meranti beam-column timber joint is more brittle than Mersawa beam column timber joint, it has an impact on the results. PRP-type of Mersawa timber connection produces a higher ductility than the standard type, while the PRP-type of Meranti timber connection produces a similar ductility to the standard type.
Effects of Shelling Ratio and Particle Characteristic on Physical Properties of Three-Layered Particleboard Made from Different Wood Species Muhammad Navis Rofii; Satomi Yumigeta; Shigehiko Suzuki; Tibertius Agus Prayitno
Wood Research Journal Vol 4, No 1 (2013): Wood Research Journal
Publisher : Masyarakat Peneliti Kayu Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.51850/wrj.2013.4.1.25-30

Abstract

Wood waste materials such as flakes, particles, sawdust, planer shaving, which are residues from furniture industry can be utilized to manufacture many composites such as particleboard. The most commonly used particleboard has three layers: two face layers and one core layer. The face layers consist of fine particles and the core layer is made of coarse particles.This study aimed to show the effect of shelling ratio and particle characteristic on physical properties of three-layer particleboard with high density core and different particles on surface layers. The materials used in this study were hinoki (Chamaecyparis obtusa) strand and knife-milled Douglas-fir (Pseudotsuga manziesii) as surface layers and hammer-milled matoa (Pometia sp.) as core layer. The wood particles were collected from a wood company. Adhesive used was MDI resin (methylene diphenyl diisocyanate) with 6 % content in mat preparation. The pressing conditions were: temperature 180°C, pressure  3 MPa and pressing time  5 min. The target density was 0.72 g/cm3 with board size of 340 mm x 320 mm  x 10 mm. Factors used in this study were layer structure according to board shelling ratio and particle characteristic. The parameters of this study were density, moisture content, thickness swelling, water absorption, linear expansion and vertical density profile.The results of this study indicate that all boards meet the requirements of JIS A 5908-2003. Higher shelling ratio of surface layers resulted in higher physical performance of three-layer particleboard. In terms of particle type, hinoki strands showed the best performance in board density and linear expansion, while Douglas-fir particle showed the best performance in moisture content, thickness swelling and water absorption. Improvement of physical properties of particleboard with high density wood particles in core layer can be conducted by adding surface layer with higher quality wood particles such as hinoki strands or Douglas-fir particles. Compared to Douglas-fir particles, hinoki strands as surface layers contribute to higher enhancement of three-layer particleboard with matoa as the core layer.
Particle Oxidation Time for the Manufacture of Binderless Particleboard Suhasman Suhasman; Muh. Yusram Massijaya; Yusuf Sudo Hadi; Adi Santoso
Wood Research Journal Vol 2, No 1 (2011): Wood Research Journal
Publisher : Masyarakat Peneliti Kayu Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.51850/wrj.2011.2.1.27-33

Abstract

The oxidation treatment using hydrogen peroxide and ferrous sulphate of wood particles can form free radicals of the wood chemical components essentially required in manufacturing binderless particleboard. The oxidation process is expected to have a certain optimal time. Therefore, the purpose of this study was to analyze relationship between the oxidation time and the characteristic of produced binderless particleboard. Three wood species from community forest, namely, sengon (Paraserianthes falcataria), gmelina (Gmelina arborea), and mindi (Melia azedarach) were used for treatment. The air-dried wood particles of 10~20 mesh in size were oxidized using 20% hydrogen peroxide based on particle dry-weight and 5% ferrous sulphate based on hydrogen peroxide weight. The oxidized particles were conditioned in room at different periods of time (15, 30, 45, 60, 75, and 90 min) prior to the board production. The oxidized and conditioned particles were then hot-pressed at 180°C for 15 min with a specific pressure of 25 kgf cm-2.Results showed that oxidation treatment for 15 min was sufficient to produce a binderless particleboard with good physical and mechanical properties. The characteristics of the particleboard, such as dimensional stability, modulus of rupture, modulus of elasticity, and internal bond were equivalent to that of particleboard made of particles with a longer oxidation time. The particle board made of sengon showed excellent thickness swelling (only 5.04%) and modulus of elasticity (37.184 kgf cm-2). This research result indicated that sengon was the most suitable raw material for binderless particleboard production compared to other observed wood species. 
Heat Deflection Temperature (HDT) Properties of Polypropylene Composite Reinforced Cellulose Microfibrils of Oil Palm Empty Fruit Bunch and Frond Wida Banar Kusumaningrum; Sasa Sofyan Munawar
Wood Research Journal Vol 9, No 1 (2018): Wood Research Journal
Publisher : Masyarakat Peneliti Kayu Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.51850/wrj.2018.9.1.8-14

Abstract

Polypropylene composites reinforcing with natural fiber is potentially applied for automotive particularly on interior part design. Those kind of composites were contributed on renewable material, rapid rate biodegradation, and low cost of production compared to synthetic fiber. Furthermore, the mechanical properties including strenghtness, young modulus, and thermal stability have revealed good performance than glass fiber. Fiber which were fibrillated and have high aspect ratio that coresspond to diameter and lenght ratio of the fiber were noticed as enhancement factor for mechanical properties. Fiber fibrillation processing into microfibrillated cellulose (MFC) attempts for widening surface area of the fiber that improve polymer matrices compatibility. MFC from empty fruit bunches (EFB) and oil palm frond (FB) fibers were performed as pulp by mechanically and chemically treatments. Chemically treatment was conducted with bleach and unbleach procedure. Polypropylene with fiber was mixed using kneader, and injection for molding process. Manufacturing uses needs appropriate size presition, moderate lead time, and low defect. Heat deflection temperature (HDT) provide information for plastic material on indicating temperature condition effect to material deformation during normal loading. Material of origin, additive or filler size, and molding temperature were directly corelated to the HDT performance. Initial temperature of HDT exhibits different value for different kind of fillers and fiber treatments. PP/EFB composite by mechanical treatment gives high value of HDT compared to the fiber processing by chemical treatment both with bleach and unbleach process. Similar result have been performed in PP/FB composites related to initial temperature. PP/ EFB composite with 30% of fiber loading represent HDT in 149.4°C, and for PP/ FB composite with 30% fiber loading gives 150.7°C. By the addition of fiber loading could improve the HDT value of the composites.
Distribution of Oil Palm Starch for Different Levels and Portions of Oil Palm Trunk Nur Syuhada Omar; Edi Suhaimi Bakar; Nurulasikin Md. Jalil; Paridah Md. Tahir; Wan Md. Zin Wan Yunus
Wood Research Journal Vol 2, No 2 (2011): Wood Research Journal
Publisher : Masyarakat Peneliti Kayu Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.51850/wrj.2011.2.2.73-77

Abstract

It is widely known that starch can be heated to have adhesive characteristic. The properties of starch rich, low density oil palm wood from the inner part of oil palm trunk (OPT) have been seen to be possible improved through steam-densification process by using in situ starch as binding agent. For that, the distribution and characteristic of the extracted starch at different height and portions of OPT are first need to be investigated. Starch extraction of OPT was made by traditional grating-dissolving method in water. Starch distributions were found more concentrated in core portion and it increased as the heights increasing. At the first 2 m height above the ground, mean extracted starch content was 2.9%, 4.3% and 5.6% for the outer, middle and core respectively. Regardless of portion, mean extracted starch content was 4.3%, 7.4%, 7.7% and 8.5% for the first, second, third, and fourth 2 m trunk height respectively. Regardless of level, mean extracted starch content was 4.9%, 7.2% and 8.8% for the outer, middle and core portion respectively. Other study using Na2S2O5 as solvent gave 7.15% mean starch content for the oil palm slabs (the outer portion). Further study on the extracted starch characterization, it was found that the starch from core portion turned into darker blue color than the outer, and the starch from upper level turned into darker blue color than the lower level when they were subjected to iodine test. The blue color is usually used to indicate the purity of starch, the darker the color, the purer the starch. The results suggest that both the extracted starch content and the starch purity were showing the same trend, increased from outer inside and from bottom upside, in the OPT.
Characterization of Poplar Overexpressing Xylanase Yong Woo Park; Kei’ichi Baba; Yuzo Furuta; Keisuke Kojiro; Masato Yoshida; Takahisa Hayashi
Wood Research Journal Vol 1, No 1 (2010): Wood Research Journal
Publisher : Masyarakat Peneliti Kayu Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.51850/wrj.2010.1.1.50-55

Abstract

We expressed Hordeum vulgare (barley) xylanase constitutively in Populus tremula x alba (poplar). The expression of xylanase reduced not only the amount of hemicellulose but also the amount of lignin in the secondary xylem. Stem and leaf growth rates were accelerated in transgenic plants. The stems also developed increased flexibility, especially in their younger parts, specifically, the regions above the 10th internode from the top. The secondary walls in the xylem would be slower to mature in xylanase-expressing poplar than in the wild type.
Antifungal Activity of Triterpenoids and Steroids Isolated from Pinus merkusii Bark Against Phanerochaete chrysosporium Masendra Masendra; Brandon Arsito Verick Purba; Ganis Lukmandaru
Wood Research Journal Vol 11, No 2 (2020): Wood Research Journal
Publisher : Masyarakat Peneliti Kayu Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.51850/wrj.2020.11.2.65-71

Abstract

The outer part of a tree, known as the bark, protects the internal tissues from external conditions and attacks from microorganisms. Its antifungal activities are due to the presence of chemicals in this bark. This study aimed at evaluating the toxicity of triterpenoids and steroids from the bark of Pinus merkusii against Phanerochaete chrysosporium (white-rot). The triterpenoids and steroids were isolated from n-hexane extract of the bark through column chromatography. Then, the antifungal activity was evaluated by measuring the growth rate of the fungus on potato dextrose agar (PDA) medium in a Petri dish. The isolation resulted in three triterpenoids (3β- methoxyserratt-14-en-21-one, serrate-14-en-3β,21β –diol, 3α,21β- dimethoxy-D14-serratene) and two steroids (β-sitosterol, Stigmast-4-en-3-one). There was more of antifungal activity with β-sitosterol and serrate-14-en-3β,21β –diol, due to presence of hydroxyl bond and their hydrophobicity.
Near Infrared (NIR) Spectroscopy to Predict Physical Properties of Acacia mangium at Three Different Age Classes Lina Karlinasari; Merry Sabed
Wood Research Journal Vol 4, No 1 (2013): Wood Research Journal
Publisher : Masyarakat Peneliti Kayu Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.51850/wrj.2013.4.1.7-12

Abstract

Near Infrared (NIR) spectroscopy has been used to predict several properties of wood. This is one of the nondestructive testing (NDT) methods providing fast and reliable wood characterization analysis which can be applied in various manufacture industry, included forest sector, in control and process monitoring task. Moisture content and wood density are important properties related to strength properties. The aim of this study was to evaluate NIR technique in obtaining calibration models for determining moisture content and wood density of Acacia mangium in the age of 5, 6, 7 years-old. Spectra were measured in both solid and ground wood samples. Laboratory testing of physical properties were determined by volumetric and gravimetric methods. The laboratory values were correlated with the NIR spectra using multivariate analysis statistic of Partial Least Square (PLS). The calibration-validation model of this relationship was evaluated by using the coefficient of determination (R2), root means square error of calibration (RMSEC) and cross-validation (RMSECV) values. Generally, a better accuracy was obtained by using calibration model of ground wood compared to that of solid wood samples. At age of 7 years-old, the R2 allowed the use of NIR spectra of solid samples to develop calibration and validation model, especially for wood density. Based on ratio of performance to deviation (RPD) and RMSE, ground samples demonstrated a higher value of RPD, RMSEC, and RMSECV compared to solid wood for all properties.
Relationship between Growth and Wood properties in Agathis sp. Planted in Indonesia Futoshi Ishiguri; Kazuko Makino; Imam Wahyudi; Jun Tanabe; Yuya Takashima; Kazuya Iizuka; Shinso Yokota; Nobuo Yoshizawa
Wood Research Journal Vol 3, No 1 (2012): Wood Research Journal
Publisher : Masyarakat Peneliti Kayu Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.51850/wrj.2012.3.1.1-5

Abstract

The present study clarified the relationship between the growth and wood properties of 54-year-old Agathis sp. trees planted in Indonesia. Stem diameter, pilodyn penetration, and stress-wave velocity (SWV) were measured for all trees (35 trees) in a plot (30  30 m) located almost at the center of a stand. Based on the mean stem diameter, 10 standard trees in a plot were selected for measuring the basic density (BD) and compressive strength parallel to grain (CS). Core samples (5 mm in diameter) were collected from the 10 selected trees to determine BD and CS. The mean stem diameter, pilodyn penetration and SWV in the plot were 40.2  11.3 cm, 23.4  2.1 cm, and 3.85  0.43 km/s, respectively. No  significant correlation coefficeint (r = -0.327, no significance at 5% level) was obtained between stem diameter and SWV. The mean BD and CS in the 10 trees were 0.42  0.03 g/cm3  and 28.1  2.7 MPa, respectively. A significant positive  correlation was observed between BD and CS. Analysis of variance (ANOVA) revealed a significant difference between BD and CS values of the 10 trees, indicating that wood properties may differ among trees with the same standard growth in a stand. From these results, we concluded that wood quality improvement in this species could be achieved by selecting  trees with high density and strength in tree breeding programs.

Page 5 of 14 | Total Record : 137

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