• Title/Summary/Keyword: pinewood

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Pb(II) Removal from Aqueous Solutions Using Pinewood and Oakwood (소나무와 참나무를 이용한 Pb(II) 제거)

  • Um, Byung-Hwan;Jo, Sung-Wook;Park, Seong-Jik
    • Journal of the Korean Wood Science and Technology
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    • v.42 no.4
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    • pp.450-459
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    • 2014
  • Crushed pinewood and oakwood were studied as an adsorbent for Pb(II) removal from aqueous solution. Batch adsorption experiments were carried out to describe the effects of contact time, initial Pb(II) concentration, pH, competing cations, and adsorbent dosage on the Pb(II) adsorption process. Kinetic studies revealed that the Pb(II) adsorption process for pinewood and oakwood followed both pseudo first and pseudo second order model. The Fruendlich model best described equilibrium adsorption data with correlation coefficients ($R^2$) of 0.956 and 0.950 for pinewood and oakwood. The maximum adsorption capacity of Pb(II) onto pinewood and oakwood was found to be 16.853 and 27.989 mg/g, respectively. The Pb(II) adsorption onto both pinewood and oakwood was increased as pH increased in the pH range 3-9. The presence of cations such as $Na^+$, $Ca^{2+}$, and $Al^{3+}$ decreased Pb(II) adsorption. The Pb(II) removal was greater in seawater than deionized water, resulting from the presence of $CO{_3}^{2-}$ and $OH^-$ ions in seawater. This study showed that pinewood and oakwood have a potential application in the remediation of Pb(II) contaminated water.

Elemental Chlorine Free Bleaching of Kraft Pulps with Enzymes(II) -Pinewood Kraft Pulp- (효소를 이용한 크라프트펄프의 무감소표백(제2보) -소나무 크라프트펄프-)

  • 강진하;박성종;정인수
    • Journal of Korea Technical Association of The Pulp and Paper Industry
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    • v.30 no.3
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    • pp.84-96
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    • 1998
  • This study was carried out to bleach the Pinewood kraft pulp without the elemental chlorine using the xylanase or wastewater(We:wastewater enzymes) effluented from the submerged biofilter reactor containing the fungi, Phanerochaete sordida YK-624. So in this research, the proper treatment conditions(pH, temperature, dosage and time) were investigated respectively. And after the various kinds of multistage bleaching of pulps, the properties of pulps were tested. From the experimental results, we can conclude as follows. In the treatments of Pinewood kraft pulps with xylanase, the proper pH, temperature, enzyme dosage and time were 8.0, $35^{\circ}C, 400EXU/kg and 3 hr. respectively. And in the case of treatment with a wastewater(We) effluented from the submerged biofilter reactor, the proper pH, temperature and time were 5.0, $37^{\circ}C and 3 hr. respectively. On the other hand, Pinewood kraft pulps were bleached by the method of a multistage bleaching using xylanase or We instead of elemental chlorine. Consequently, the strengthes and brightnesses of pulps bleached by the method mentioned above were lower than those of pulp bleached by the conventional method using the elemental chlorine. But it is possible to improve the brightnesses through the increase of chlorine dioxide dosage or use of hydrogen peroxide in the final bleaching stage.

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Ophiostoma ips from Pinewood Nematode Vector, Japanese Pine Sawyer Beetle (Monochamus alternatus), in Korea

  • Suh, Dong Yeon;Hyun, Min Woo;Kim, Jae Jin;Son, Seung Yeol;Kim, Seong Hwan
    • Mycobiology
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    • v.41 no.1
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    • pp.59-62
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    • 2013
  • Japanese pine sawyer beetle (Monochamus alternatus) is an economically important pest in coniferous trees. Ophiostoma ips was isolated from the beetle and identified based on analysis of morphological properties and the ${\beta}$-tubulin gene sequence. The fungus easily produced perithecia with a long neck on malt extract agar and its ascospores were rectangular shaped. This is first report of Ophiostoma species associated with the pinewood nematode vector beetle in Korea.

Physicochemical Properties and Copper(II) Ion Adsorption Ability of Wood Charcoals (소나무 및 참나무 백탄의 물성과 구리(II) 이온 흡착 효과)

  • Lee, Oh-Kyu;Jo, Tae-Su
    • Journal of Korea Foresty Energy
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    • v.25 no.2
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    • pp.55-63
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    • 2006
  • Physicochemical properties and copper (II) adsorption ability of two oakwood and two pinewood charcoals, which were manufactured in traditional mode and commercialized in Korea, were examined pHs of these four wood charcoals were between 9.5 and 9.8. In the elemental contents of the wood charcoal, the contents of carbon atom (C) in the four samples were between 85-90%, while the content of hydrogen atom (H) in pinewood charcoal of the company 'S' was 1.62% and this value was three time higher than those of other samples. For iodine adsorption and specific surface area, the pinewood charcoal sample showed higher values than those of the oakwood charcoals. In the copper (II) ion adsorption in aqueous solution, the adsorption rate was increased by the increase of treated amounts of charcoal, treatment time, and pH.

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Amplified fragment length polymorphism analysis and genetic variation of the pinewood nematode Bursaphelenchus xylophilus in South Korea

  • Jung, Jong-Woo;Han, Hye-Rim;Ryu, Sung-Hee;Kim, Won
    • Animal cells and systems
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    • v.14 no.1
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    • pp.31-36
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    • 2010
  • The pinewood nematode Bursaphelenchus xylophilus causes pine wilt disease and is a serious economic concern for the forest industry of South Korea. To achieve effective control with limited resources, it is necessary to clarify the transmission routes and mechanisms of dispersal of this organism. Highly polymorphic and easy-to-use molecular markers can be used for investigating this aspect. In this study, we evaluated the usefulness of amplified fragment length polymorphisms (AFLPs) for investigating the genetic variations of B. xylophilus and related individuals from China, Japan, and South Korea. The AFLP patterns obtained in our study were similar to the microsatellite patterns reported in a previous study; our AFLP patterns indicated high genetic variability and cryptic genetic structure, but did not indicate any peculiar geographic structure. Moreover, the genetic distances between individuals suggested that the Korean population was affected to a greater extent by the Chinese population than the Japanese population. Further, the gene flow among the related species appeared to be limited; however, there may be also the possibility of genetic introgression among species. These results confirm the usefulness of AFLPs for understanding the epidemiology of pine wilt disease, thereby contributing to the effective control of this disease.

Influence of Pinewood Nematode, Bursaphelenchus xylophilus, on the Growth of Endoparasitic Fungus Esteya vermicola (Endoparasitic fungus Esteya vermic의 성장에 미치는 소나무 선충 Bursaphelenchus xylophilus의 영향)

  • Wang, Chun-Yan;Lee, Chung-Ha;Lee, Mi-Ra;Yun, Beom-Sik;Liu, Lei;Wang, Zhen;Fang, Zhe-Ming;Zhang, Dong-Liang;Li, Zheng;Sung, Chang-Keun
    • Journal of Life Science
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    • v.20 no.5
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    • pp.644-648
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    • 2010
  • The influence of nematodes on nematophagous fungi has seldom been investigated. In the present study, the influence of pinewood nematode on its endoparasitic fungus, Esteya vermicola, was investigated systemically. Although both nematodal metabolite and nematodal homogenate could stimulate and speed up the growth of E. vermicola, the impact of nematodal metabolite was slightly higher than that of nematodal homogenate. In addition, a method was developed to investigate the influence of volatiles, discharged by pinewood nematodes in their metabolic process, on the growth of E. vermicola. Reproductive results were given and confirmed that nematodal volatiles have no influence on the cell growth of E. vermicola. This study may provide information for the application of E. vermicola as biological control agent of pinewood nematode.

Effect of pinewood nematode on the water content and early disease development of seedlings of susceptible Pinus densiflora and resistant Pinus × rigitaeda for breeding for resistance to pinewood nematode

  • Woo, Kwan-Soo;Yoon, Jun-Hyuck;Fins, Lauren;Lee, Do-Hyung;Koo, Yeong-Bon;Yeo, Jin-Kie
    • Korean Journal of Breeding Science
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    • v.41 no.4
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    • pp.377-384
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    • 2009
  • Three-year-old seedlings of susceptible Pinus densiflora and resistant Pinus x rigitaeda were each inoculated with the pinewood nematode, Bursaphelenchus xylophilus, to compare disease development. Needle dehydration was evident on seedlings of P. densiflora by 20 days after inoculation, 10 days earlier than this symptom was observed on P. ${\times}$ rigitaeda. Xylem drying was more frequent in seedlings of P. densiflora than in that of P. ${\times}$ rigitaeda between 20 and 60 days after inoculation. No significant differences were found between P. densiflora and P. ${\times}$ rigitaeda for stem water content or for stem and leaf relative water content in current-year branches after nematode inoculation, but the average number of B. xylophilus recovered from stems differed significantly between the two groups. The number of B. xylophilus recovered from stems was negatively correlated with the stem water content and with stem and leaf relative water content. By the time the experiment was terminated at 60 days after inoculation, all 3 of the last group of P. densiflora seedlings had died, but 2 of the 3 remaining P. ${\times}$ rigitaeda hybrid seedlings were still alive. Additional studies are needed to further explore the specific mechanisms preventing nematode multiplication in the seedlings of resistant P. ${\times}$ rigitaeda.

Evaluation of Energy Consumption in Heat Treatment of Pine Log (소나무 원목의 열처리 소요 에너지 평가)

  • Eom, Chang-Deuk;Park, Jun-Ho;Han, Yeon Jung;Shin, Sang-Chul;Chung, YoungJin;Jung, Chan-Sik;Yeo, Hwanmyeong
    • Journal of the Korean Wood Science and Technology
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    • v.36 no.6
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    • pp.41-48
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    • 2008
  • The required energy for the heat treatment of pine log was evaluated in this study. A proper heat treatment of pine log infected by pinewood nematode (Bursaphelenchus xylophilus) can prevent spreading of the infection by pinewood nematode and make the infected pinewood valuable again. The FAO (Food and Agriculture Organization of the United Nations) heat treatment standard for various types of infected wood for which a heat treatment of the core part of the wood is necessary is 30 minutes at $56^{\circ}C$, taking into account the international standards for phytosanitary measures (ISPM No. 15). In this study, the energy consumption during the heat treatment was separated into two kinds of energy, initial energy for heating kiln drier and to reach set point temperature and relative humidity and the required energy supplementing heat loss. The initial required energy per unit time is greater than that during the treatment. The energy consumption per unit time varied little during the heat treatment. As a result, the set point relative humidity with set dry bulb temperature and density of wood dependent on moisture content are very important factors to change energy consumption in the experiment. The heat treatment at higher temperature and higher humidity levels requires more energy consumption but less treatment time. It is expected that a more effective energy program could be planed for the heat treatment of pine log through this study.

Low-pathogenic Pinewood Nematode Found in Dead Trees and Resistance of Pines Induced by Its Pre-inoculation (고사목에서 발견되는 저병원성 소나무재선충 및 이의 인공접종에 의하여 유도되는 소나무의 저항성)

  • Park, Seung-Chan;Moon, Yil-Sung;Kim, Dong-Soo
    • Korean journal of applied entomology
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    • v.53 no.2
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    • pp.141-147
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    • 2014
  • Pinewood nematode (PWN: Bursaphelenchus xylophilus) is known to kill pine tree species that are indigenous to countries where the pest was inadvertently imported, but some cultures from the extraction of dead pines do not damage trees. Experiments were conducted to examine the effect of pre-inoculation of these low-pathogenic pinewood nematode on resistance of pine trees against the pest species. The pre-inoculated pine saplings showed induced resistance which lasted for a year, and repeated inoculation of these low-pathogenic nematodes enhanced tree resistance. All nematode samples extracted from dying or dead pines that had been killed not more than three months before the extraction were pathogenic, and most of those extracted from pines that had been killed 2-3 years before were low-pathogenic. When inoculated in pine saplings, number of low-pathogenic nematodes settled, as studied two days after inoculation, was not different from that of pathogenic ones. However, as studied after 30 days of inoculation, rate of reproduction in low-pathogenic nematodes was far lower than that of pathogenic nematodes. The rate of reproduction of several nematode isolates growing on fungal mat media of Botrytis cinerea varied, but three of four low-pathogenic isolates showed same level of reproduction rates as pathogenic ones.

Distribution of Bursaphelenchus xylophilus in Naturally Infected Pinus densiflora and P. koraiensis and Migration of B. xylophilus in Artificially Inoculated P. densiflora Seedlings (자연감염된 소나무와 잣나무 내 소나무재선충 분포 및 인공접종한 소나무 묘목 내에서의 소나무재선충 이동)

  • Kim, Jae-Geun;Kim, Byung-Kwan;Lee, Seung-Kyu;Kim, Jin-Cheol;Han, Sang-Sub;Cha, Byeong-Jin
    • Research in Plant Disease
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    • v.18 no.2
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    • pp.101-108
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    • 2012
  • In 2006, pinewood nematode, Bursaphelenchus xylophilus, was isolated from about 50 years old trees of Pinus densiflora and P. koraiensis showing leaf-wilt and -drying symptoms in Gwangju, Gyeonggi-do and Chuncheon, Gangwon-do. Isolation of pinewood nematodes from sapwood of infected pine trees showed no difference in population density between tree species and among the sampling heights on the main stem. Migration of pinewood nematodes in the host tree were investigated by inoculation of red pine (P. densiflora, 3 years old) seedlings with B. xylophilus. The nematodes seemed to move in red pine seedlings prior to multiplication and it might have taken about 20 days to start multiplication and expression of symptoms including wilt and dieback. In initial time after inoculation, nematodes started migration through the cortical resin canal from inoculated site and further showed upward and downward movements. More nematodes were observed in cortical resin canal during early period of inoculation and later in resin canal of xylem and tracheid also while, the pith still remained free from nematode. The density of B. xylophilus was higher in seedlings of low-vigor with poor root growth than in seedlings of normal root growth. Seedlings showing high density of B. xylophilus exhibited stem discoloration and secondary infection by fungus at the inoculation site.