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Narumol Matan - One of the best experts on this subject based on the ideXlab platform.
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effect of cold atmospheric plasma on antifungal activities of clove oil and eugenol against molds on areca palm areca catechu Leaf Sheath
International Biodeterioration & Biodegradation, 2014Co-Authors: Narumol Matan, Mudtorlep Nisoa, Tanong AewsiriAbstract:Abstract An attempt to control the growth of Aspergillus niger, Penicillium sp., and Rhizopus sp., commonly found on the surface of the areca palm (Areca catechu) Leaf Sheath, by using clove oil and its main components (eugenol, linalool, and caryophyllene) at concentrations of 5–100 μl ml−1 both in vitro (agar dilution method) and in vivo (dip method) was enhanced by discharging cold atmospheric plasma at 40 W for 10 min. The results showed that the minimum inhibitory concentration (MIC) of clove oil and eugenol was reduced tenfold against all molds at concentrations of 10 μl ml−1 and 5 μl ml−1, respectively, after cold atmospheric plasma treatment. For the in-vivo assays, clove oil at 30 μl ml−1 and eugenol at 10 μl ml−1with cold atmospheric plasma could extend the protection against the growth of all molds on the surface of an areca palm Leaf Sheath from 14 days (control) to at least 12 wk at 25 °C. In addition, it was observed that eugenol was the main agent responsible for the antifungal activity of clove oil after plasma treatment. This study has demonstrated the good potential of using atmospheric plasma treatment to enhance antifungal activity of clove oil and to control molds on an areca palm Leaf Sheath.
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antifungal activities of essential oils applied by dip treatment on areca palm areca catechu Leaf Sheath and persistence of their potency upon storage
International Biodeterioration & Biodegradation, 2011Co-Authors: Warasri Saengkrajang, Narumol MatanAbstract:Abstract The antifungal activities of cinnamon oil, clove oil, anise oil, and peppermint oil, and their main components (cinnamaldehyde, eugenol, trans -anethole, and menthol, respectively) against molds identified from areca palm Leaf Sheath ( Mucor dimorphosporus , Penicillium sp., Aspergillus niger , and Rhizopus sp.) were investigated. An agar dilution method was employed to determine the minimum inhibitory concentration (MIC) of essential oils and their main components. Zone inhibition tests and the inhibitory effect of the Leaf Sheath dip-treated with essential oils against those molds were examined. Major components of essential oils on the Leaf Sheath during storage were quantified by gas chromatography analysis. The MIC values of essential oils on agar and on the Leaf Sheath were identical. With an MIC of 50 μg ml −1 , cinnamon oil had the strongest inhibitory effect. At their MICs the oils were capable of providing protection against mold growth on the Leaf Sheath for at least 12 weeks during storage at 25 °C and 100% RH. Scanning electron microscope examination showed that essential oils prevented spore germination. Except for menthol in peppermint oil, the main components of the essential oils, which were fairly stable over the storage period, largely contributed to the antifungal activity.
Lan Cheng - One of the best experts on this subject based on the ideXlab platform.
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investigations on the structure and properties of palm Leaf Sheath fiber
Cellulose, 2015Co-Authors: Tonghua Zhang, Min Guo, Lan ChengAbstract:As a natural cellulosic fiber, palm Leaf Sheath fiber (palm fiber) is widely-distributed and abundant cellulose and engineering fiber resource. To obtain essential information about palm fiber, its morphology, composition, chemical and crystal structure, tensile characteristic and adsorption property were investigated. Test results of palm fiber were compared with those of other natural cellulosic fibers. Palm fiber presents aligned Si-dots on the surface and abundant fiber cells with spiral vessel tissues at the cross section. The chemical composition reveals that palm fiber contains abundant lignin but smaller amount of cellulose (the content of 28.16 %). In addition, investigation illustrates that cellulose in palm fiber is Iβ-dominant type, which is also confirmed by FTIR analysis. X-ray diffraction study shows that the crystallinity (30.52 %), crystallinity index (36.5 %) and crystal size (2.5 nm) are all apparently lower than those of ramie, flax and bamboo fibers. Given the low crystallinity and cellulose content of palm fiber, its tensile strength and Young’s modulus are also lower than those of other fibers. Moreover, palm fiber exhibits excellent breaking elongation, high moisture regain, distinct yield characteristic, and variability in strength. The modified Weibull model was used to study the tensile behavior of palm fiber. This model accurately predicted fiber strength. The absorption volume in isotherm of carbonized palm fiber increases with rising pressure, thus indicating good porous structure of the fiber.
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tensile strength analysis of palm Leaf Sheath fiber with weibull distribution
Composites Part A-applied Science and Manufacturing, 2014Co-Authors: Min Guo, Tonghua Zhang, B W Chen, Lan ChengAbstract:Abstract Palm Leaf Sheath fiber (palm fiber) was subjected to monotonic tensile load at four different gauge lengths, and its tensile behavior was investigated. The strength of palm fiber was studied by traditional Weibull models, compared with jute fiber. Modified Weibull model was also studied by considering the fiber diameter effect. The SEM graphics of breaking surfaces were obtained to study the fracture mechanism of palm fiber. Results show that palm fiber had a large diameter and excellent elongation properties. Weibull distribution was very suitable for strength analysis. Strength and Weibull modulus decreased, whereas Young’s modulus increased with the increase in gauge length and strength dispersion. The diameter had negative effect on palm fiber strength and modified Weibull model could predict strength accurately. Three main states of breaking surfaces were found and discussed. In addition, the strength of palm fiber was found more sensitive to gauge length than sisal fiber.
Mari Iwayainoue - One of the best experts on this subject based on the ideXlab platform.
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expression of rice sucrose transporter gene ossut1 in sink and source organs shaded during grain filling may affect grain yield and quality
Environmental and Experimental Botany, 2014Co-Authors: Yushi Ishibashi, Kenta Okamura, Masayuki Miyazaki, Thuy Phan, Takashi Yuasa, Mari IwayainoueAbstract:Abstract Low irradiance (shading) during the early phase of grain filling in rice ( Oryza sativa L.) results in low grain yield and quality. The effects of shading on partitioning of assimilated carbon within the panicle and the whole plant have been reported, but its effect on the ability to transport assimilated carbon has not been examined in detail. The objective of this study was to investigate the effects of shading on the transport of assimilated carbon and on the expression of the sucrose transporter gene OsSUT1 during the early phase of grain filling. Shading of the whole plant for 14 days after flowering reduced grain dry weight and OsSUT1 expression in grains, flag Leaf, flag Leaf Sheath, first Leaf blade, first Leaf Sheath, second Leaf blade, and stem (but not in second Leaf Sheath), although initially (after 1 week) the expression in grains and second Leaf Sheath increased. We also shaded sink (panicle), source (Leaf and Leaf Sheath), or whole plant from 7 to 14 days after flowering and examined the expression of OsSUT1 in grains and panicle branches. In grains, OsSUT1 expression increased in all shading treatments. In branches, OsSUT1 expression decreased upon shading of the whole plant or sink, but increased upon source shading. Additionally, 1000-grains dry weight and ratio of perfect grain significantly decreased upon shading of the whole plant, but not sink or source. These results suggest that the decrease in grain yield and quality by shading during the early phase of grain filling is caused not only by shortage of Leaf-derived photoassimilates, but also by suppression of OsSUT1 in sink and source.
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high temperature induced repression of the rice sucrose transporter ossut1 and starch synthesis related genes in sink and source organs at milky ripening stage causes chalky grains
Journal of Agronomy and Crop Science, 2013Co-Authors: Thuy Phan, Yushi Ishibashi, Kenta Okamura, Masayuki Miyazaki, Takashi Yuasa, Huong Thi Tran, Seiya Tanaka, Junya Nakamura, Mari IwayainoueAbstract:High temperatures during rice grain ripening reduced yield and grain quality. The proportion of milky white grains was 43.6 % at 30 °C but only 6.5 % at 25 °C. Grain filling was initially faster at 30 °C and finished earlier, and the final dry matter content was less, than at 25 °C. High temperature strongly suppressed the expression of the sucrose transporter gene OsSUT1 and starch synthesis-related genes SuSy2, AGPS2b, BEIIb and Granule-bound starch synthase in grains during early grain filling; the transcription levels of OsSUT1 at 14 days after flowering (DAF) were about 60 % lower in grains, flag Leaf blade, flag Leaf Sheath and first Leaf Sheath. These facts are possibly involved in the earlier termination of grain filling at 21 DAF, following the rapid rise of grain dry weight from 0 to 7 DAF, due to possible reduction in assimilate supply via OsSUT1 under the high temperature. When panicles were partly clipped, the resultant increase in assimilate supply to the remaining grains significantly upregulated the expression of OsSUT1 and the starch synthesis-related genes at 14 DAF, which consequently accelerated starch accumulation in the grains and ultimately increased the grain weight of remaining grains at 30 °C. These results indicate that high temperature during grain filling reduces grain yield and quality by changing the expression of OsSUT1 and starch synthase-related genes, resulting in earlier ripening due to hastened or premature assimilate supply to grains.
Tanong Aewsiri - One of the best experts on this subject based on the ideXlab platform.
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effect of cold atmospheric plasma on antifungal activities of clove oil and eugenol against molds on areca palm areca catechu Leaf Sheath
International Biodeterioration & Biodegradation, 2014Co-Authors: Narumol Matan, Mudtorlep Nisoa, Tanong AewsiriAbstract:Abstract An attempt to control the growth of Aspergillus niger, Penicillium sp., and Rhizopus sp., commonly found on the surface of the areca palm (Areca catechu) Leaf Sheath, by using clove oil and its main components (eugenol, linalool, and caryophyllene) at concentrations of 5–100 μl ml−1 both in vitro (agar dilution method) and in vivo (dip method) was enhanced by discharging cold atmospheric plasma at 40 W for 10 min. The results showed that the minimum inhibitory concentration (MIC) of clove oil and eugenol was reduced tenfold against all molds at concentrations of 10 μl ml−1 and 5 μl ml−1, respectively, after cold atmospheric plasma treatment. For the in-vivo assays, clove oil at 30 μl ml−1 and eugenol at 10 μl ml−1with cold atmospheric plasma could extend the protection against the growth of all molds on the surface of an areca palm Leaf Sheath from 14 days (control) to at least 12 wk at 25 °C. In addition, it was observed that eugenol was the main agent responsible for the antifungal activity of clove oil after plasma treatment. This study has demonstrated the good potential of using atmospheric plasma treatment to enhance antifungal activity of clove oil and to control molds on an areca palm Leaf Sheath.
Jongmin Lee - One of the best experts on this subject based on the ideXlab platform.
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mof derived nickel and cobalt metal nanoparticles in a n doped coral shaped carbon matrix of coconut Leaf Sheath origin for high performance supercapacitors and oer catalysis
Electrochimica Acta, 2018Co-Authors: Anjali Jayakumar, Rajini P Antony, Jun Zhao, Jongmin LeeAbstract:Abstract Coconut Leaf Sheath-derived nitrogen doped carbon framework is developed and incorporated with nickel and cobalt metal nanoparticles in the carbon matrix by a facile process of growing ZIF-67 metal organic framework particles on the graphitised carbon, followed by annealing it in inert atmosphere. Various parameters are modified to obtain three different samples. These samples are tested for high performance supercapacitors and oxygen evolution reaction (OER) catalysts. The optimised sample NiCo C-1 gave a high specific capacity of 308 mAh g−1 at a current density of 1 A g−1 in a 2 M KOH electrolyte. An asymmetric supercapacitor assembly prepared from NiCo C-1 as the positive electrode and the nitrogen-doped carbon as the negative electrode, exhibited an energy density of up to 31.8 Wh Kg−1 for a high power density of 6.2 kW kg−1 over a potential window of 0–1.55 V. Two of our best samples were also tested for OER, giving good water oxidation kinetics, revealed by their lower Tafel slopes of around 107 mV and a low over potential (η) of around 420 mV at a current density of 10 mA cm−2. Hence, this work opens great avenues for biomass-derived materials for high performance supercapacitors and catalysis.