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Search Results: 1 - 10 of 1310 matches for " brown-rot "
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Anatomical changes in Willow Wood Decayed by the brown rot fungus Coriolellus malicola (Basidiomycota)
Murace,Mónica A.; Luna,María L.; Keil,Gabriel D.; De Cristófano,Natalia N.;
Bolet?-n de la Sociedad Argentina de Bot??nica , 2006,
Abstract: in argentina, salix wood is employed mainly in pulp and paper industry. in this country, the brown rotter c oriolellus malicola was found in association with willow plantations. the purpose of this work was to study the anatomical changes caused by c. malicola in willow wood in order to provide information on the effects of brown rot decay in the yield and quality of pulp. two willow clones were employed: salix nigra 4 and salix babylonica x salix alba cv i 131-25 . two exposure times were used: 75 and 150 days. the percentages of weight loss produced by this fungus in both clones was ca. 30% at 75 days and ca. 60% at 150 days of decay. c. malicola degraded mainly fibre walls. microscopically, the loss of cell shape, the presence of transwall fractures and the loss of birefringence were the main anatomical modifications observed. according to our observations decayed salix wood by c. malicola seems to be inadequate for pulp industry.
BIODEGRADATION OF CELLULOSE BY WOOD DECAYING FUNGI
JAGRATI PARIHAR,C.K.TIWARI,AKHILESH AYACHI,R.K. VERMA
Journal of Applied Sciences in Environmental Sanitation , 2012,
Abstract: In the present study 212 specimens of wood decaying fungi were collected from Chhattisgarh, India, during survey in rainy season, 2009- 2010. These were identified, brought in pure culture by tissue culture method on Potato dextrose agar medium. Out of these, 33 species were screened and tested for cellulose degradation capability using filter paper cellulose. The ability of host fungus to utilize insoluble form of cellulose was measured. It was found that, all the 33 wood decaying fungi were able to decompose cellulose at varying degree. Biodegradation of cellulose and CAI were observed maximum with Navisporus floccosus whereas, Pyrofomes tricolor showing minimum biodegradation of cellulose and Flavodon flavus show minimum CAI. It is concluded that cellulose decomposition pattern was vary not only among the genera but also between the species of same genus.
The pretreatment of corn stover with Gloeophyllum trabeum KU-41 for enzymatic hydrolysis
Ziqing Gao, Toshio Mori, Ryuichiro Kondo
Biotechnology for Biofuels , 2012, DOI: 10.1186/1754-6834-5-28
Abstract: The content of xylan in pretreated corn stover was decreased by 43% in comparison to the untreated corn stover. The initial cellulase adsorption capacity and the specific surface area of corn stover pretreated with G. trabeum were increased by 7.0- and 2.5-fold, respectively. Also there was little increase in the cellulose crystallinity of pretreated corn stover.G. trabeum has an efficient degradation system, and the results indicated that the conversion of cellulose to glucose increases as the accessibility of cellulose increases due to the partial removal of xylan and the structure breakage of the cell wall. This pretreatment method can be further explored as an alternative to the thermochemical pretreatment method.
DEPOLYMERIZATION OF CELLULOSE BY LOW MOLECULAR WEIGHT COMPOUNDS FROM BROWN-ROT FUNGI
褐腐真菌产生的低分子化合物对纤维素的解聚作用研究

Wang wei,
王蔚
,卢雪梅,高培基

菌物学报 , 1997,
Abstract: Eight strains incuding Pleurotus ostreatus, Gloeophyllum trabeum and Lentinus lepideus were selected for degradation of filter paper.In initial incubation,fungal degradation of cellulose was characterized by the rapid decrease of polymerization and little weight loss of cellulose. Besides that, the filter.paper activities were not detected . All the tested strains had Fe3+-chelating ability and produced hydroxyl radical. Extracellular compounds of Gloeophllum trabeum were partially purified on Sephadex LH-20 and a fraction with low molecular weight was obtained. This fiaction could oxidize Cellulose and break it into short fibrils which resulted in the great reduction of cellulose polymerization degree.
Anatomical changes in Willow Wood Decayed by the brown rot fungus Coriolellus malicola (Basidiomycota) Modificaciones anatómicas en madera de sauce por acción Coriolellus malicola (Aphyllophorales) agente de pudrición casta a
Mónica A. Murace,María L. Luna,Gabriel D. Keil,Natalia N. De Cristófano
Boletín de la Sociedad Argentina de Botánica , 2006,
Abstract: In Argentina, Salix wood is employed mainly in pulp and paper industry. In this country, the brown rotter C oriolellus malicola was found in association with willow plantations. The purpose of this work was to study the anatomical changes caused by C. malicola in willow wood in order to provide information on the effects of brown rot decay in the yield and quality of pulp. Two willow clones were employed: Salix nigra 4 and Salix babylonica x Salix alba cv I 131-25 . Two exposure times were used: 75 and 150 days. The percentages of weight loss produced by this fungus in both clones was ca. 30% at 75 days and ca. 60% at 150 days of decay. C. malicola degraded mainly fibre walls. Microscopically, the loss of cell shape, the presence of transwall fractures and the loss of birefringence were the main anatomical modifications observed. According to our observations decayed Salix wood by C. malicola seems to be inadequate for pulp industry. En la República Argentina la madera de Salix es empleada principalmente en la industria papelera. En este país el hongo de pudrición casta a C oriolellus malicola se encontró asociado a plantaciones comerciales de sauce. El objetivo de este trabajo fue estudiar las modificaciones anatómicas causada por C. malicola en la madera de sauce con el fin de aportar información sobre los efectos de la pudrición casta a en los rendimientos y calidad de la pulpa para papel. Se emplearon dos clones: Salix nigra 4 y Salix babylonica x Salix alba cv I. 131-25 . Se trabajó con dos tiempos de exposición: 75 y 150 días. Las pérdidas de peso producidas por esta cepa en ambos clones fueron de ca. del 30% a los 75 días y de ca. del 60% a los 150 días de incubación. C. malicola degradó principalmente las paredes de las fibras. Microscópicamente, las principales modificaciones anatómicas observadas fueron: deformación del tejido, presencia de fracturas transversales en las paredes celulares y pérdida de birrefringencia. De acuerdo con nuestras observaciones la madera de Salix degradada por C. malicola sería inadecuada para la industria del pulpado.
CULTURAL CHARACTERS OF WOOD-ROTTING FUNGI
木材腐朽菌培养特性的研究综述

CHI,Yu-Jie,
池玉杰

菌物学报 , 2004,
Abstract: The significance to study on cultural characters of wood-rotting fungi was discussed. Literatures related to cultural characters of wood-rotting fungi since 1889 were reviewed. The conclusions in general about cultural characters of wood-rotting fungi were gained according to the literaturers on abroad and home.
Metodologia para detec??o de infec??es latentes de Monilinia fructicola em frutas de caro?o
Moreira, Luciene Martins;Mio, Louise Larissa May-De;
Ciência Rural , 2007, DOI: 10.1590/S0103-84782007000300005
Abstract: the brown rot fungus monilinia fructicola is economically the most important pathogen for stone fruit trees. the fungus infects since blossoming and may remain latent in the fruits and manifest symptoms during harvest and postharvest. the present study aimed at evaluating methodologies to detect latent infections in developing fruits for different cultivars of stone fruit trees. eight cultivars of stone fruit trees were chosen in order to evaluate latent infections of m. fructicola. for that purpose, 30 fruits of each cultivar were collected and separated into two batches of 15 fruits. one of them was subject to immersion for two minutes in a sequence of ethanol solution 70%, later, sodium hypochlorite 2%, and finally washed in sterilized water. the treatment for the second batch of fruits was similar to the first one, adding paraquat solution 2% (paraquat - 200g l-1, gramocil-sc) after the hypochlorite. after the treatments, the fruits were laid in humid chamber in plastic packages containing humid filter paper at room temperature. the evaluation of the incidence of the disease was carried out every 48 hours for 10 days. the latent infections were detected in the majority of the cultivars evaluated with the two methods, mainly in the fruits closer to maturation. the treatment in which herbicide was used increased the detection of brown rot in the plum cultivars reubennel and harry pickstone. for the peaches in cultivar br-3, the two methods favored the detection; however, in the cultivars chimarrita and vila nova there was higher detection of latent infection when paraquat was not utilized.
Durability of Pinus elliottii Wood Impregnated with Quebracho Colorado (Schinopsis balansae) Bio-Protectives Extracts and CCA
Bernardi,Aldo C; Popoff,Orlando;
Maderas. Ciencia y tecnología , 2009, DOI: 10.4067/S0718-221X2009000200002
Abstract: some wood preservatives have a warning due to environmental restrictions and risks to man health. the aim of this study is to determine the performance of non impregnated and impregnated wood with a cca salt and a bio-protective made from "quebracho colorado", when facing the action of fungi responsible for white rot decay by pycnoporus sanguineus and brown rot attack by gloeophyllum sepiarium. wood samples were impregnated with different solutions by vacuum-pressure method. the design was in complete blocks at random with five repetitions. the treatments were t0: non impregnated blank sample; impregnated t1: cca; t2 colatan ipg-f, t3: colatan ipg-c, t4: colatan ipg-c, with retentions of: 6, 18, 9 and 25 kg m-3 respectively. the variable was wood weight loss. preservative cca and bio-protective colatan ipg-c increased the resistance to fungal degradation in lab assay, changing from non-resistance to very resistant (findlay criterion), guaranteeing the biodegradation process inhibition.
Durability of Pinus elliottii Wood Impregnated with Quebracho Colorado (Schinopsis balansae) Bio-Protectives Extracts and CCA
Aldo C Bernardi,Orlando Popoff
MADERAS : Ciencia y Tecnología , 2009,
Abstract: Some wood preservatives have a warning due to environmental restrictions and risks to man health. The aim of this study is to determine the performance of non impregnated and impregnated wood with a CCA salt and a bio-protective made from "quebracho colorado", when facing the action of fungi responsible for white rot decay by Pycnoporus sanguineus and brown rot attack by Gloeophyllum sepiarium. Wood samples were impregnated with different solutions by vacuum-pressure method. The design was in complete blocks at random with five repetitions. The treatments were T0: non impregnated blank sample; impregnated T1: CCA; T2 Colatan IPG-F, T3: Colatan IPG-C, T4: Colatan IPG-C, with retentions of: 6, 18, 9 and 25 kg m-3 respectively. The variable was wood weight loss. Preservative CCA and bio-protective Colatan IPG-C increased the resistance to fungal degradation in lab assay, changing from non-resistance to very resistant (Findlay criterion), guaranteeing the biodegradation process inhibition.
Natural Protection of Wood with Antagonism Fungi
Alba ZAREMSKI
Pro Ligno , 2011,
Abstract: Biological environments contain a certain number of microbial populations which, within a givenecological niche, display various relations ranging from symbiosis to parasitism. Researchers have beeninterested in these types of relations for around fifty years, especially in one very particular type ofrelationship: the antagonism exerted between individuals of the same microbial population.Today, the role played by biological agents, bringing into play inhibitive or destructive antibioticsubstances, reveals a certain potential for their use in controlling microorganisms associated with suchdegradation processes.The work undertaken by HydroQuébec and CIRAD involved two types of experiment: 1) in Petri dishes toassess and characterize the antagonistic capacity of Trichoderma against white rot and brown rot fungi; 2)on pieces taken from untreated poles in order to study confrontation between the basidiomycete and theantagonistic strain in wood.This study investigated the antagonism of three ascomycetes of the genus Trichoderma against two whiterot basidiomycetes, Pycnoporus sanguineus and Coriolus versicolor, and two brown rot basidiomycetes,Antrodia sp. and Coniophora puteana, through direct confrontation in Petri dishes and in the wood ofHydroQuébec poles.The results obtained seemed to complete each other coherently. They revealed that the Trichodermagroup of fungi was not aggressive to wood and the results obtained after direct confrontation in Petri disheswere confirmed in wood.By directly exposing the different basidiomycetes and antagonists to each other in Petri dishes, two bytwo, we effectively revealed an antagonism effect for a large majority of the pairs. However, there wassubstantial variability in reactions from one pair to the next.
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