Página 1 dos resultados de 156 itens digitais encontrados em 0.015 segundos

Durabilidade da madeira do gênero Pinus tratada com preservantes: avaliação em campo de apodrecimento.; Durability of preservative treated Pinus lumber: evaluation through field stake test.

Barillari, Cristiane Tabarelli
Fonte: Biblioteca Digitais de Teses e Dissertações da USP Publicador: Biblioteca Digitais de Teses e Dissertações da USP
Tipo: Dissertação de Mestrado Formato: application/pdf
Publicado em 13/05/2002 PT
Relevância na Pesquisa
56.41%
A madeira quando usada em contato direto com o solo, é atacada por agentes biológicos, principalmente fungos apodrecedores e cupins subterrâneos. Uma maneira de ampliar as possibilidades de utilização das espécies de baixa durabilidade natural, como as do gênero Pinus, é através do tratamento químico preservante. No entanto, faltam informações disponíveis que indiquem a durabilidade destas madeiras em serviço. A fim de se determinar a durabilidade da madeira do gênero Pinus tratada com preservantes, a Escola Superior de Agricultura "Luiz de Queiroz" e o Instituto Florestal do Estado de São Paulo instalaram, em 1980, campos de apodrecimento segundo método de ensaio sugerido pelo IUFRO (International Union of Forestry Research Organizations). As espécies utilizadas no ensaio foram o Pinus elliottii Engl. var. elliottii, o Pinus caribaea Mor. var. hondurensis, B & G., o Pinus oocarpa Shied e o Pinus kesiya Royle ex Gordon; tratadas com os preservantes CCA tipos A, B e C, CCB e pentaclorofenol, em cinco níveis de retenção. Em continuidade ao projeto, foi inspecionado o campo instalado na Estação Experimental de Mogi-Guaçu, visando avaliar o estado de sanidade do material. A análise dos resultados obtidos até o momento...

Madeira Laminada Colada (MLC): controle de qualidade em combinações espécie-adesivo -tratamento preservativo; GLULAM: quality control in combinations of species-adhesive-preservative treatment

Calil Neto, Carlito
Fonte: Biblioteca Digitais de Teses e Dissertações da USP Publicador: Biblioteca Digitais de Teses e Dissertações da USP
Tipo: Dissertação de Mestrado Formato: application/pdf
Publicado em 03/03/2011 PT
Relevância na Pesquisa
35.99%
A Madeira Laminada Colada (MLC) é um produto engenheirado que requer precisão de fabricação em todos os seus estágios. O produto acabado pode somente ser testado em condições laboratoriais, entretanto é necessário o controle de qualidade na sua produção para assegurar que suas propriedades sejam conformes aos requisitos especificados para o produto de acordo com as normas vigentes. Considerando que no Brasil ainda não existe uma norma específica de qualificação para a MLC e o potencial que esse material tem de ocupar espaço no mercado futuro, este trabalho tem por finalidade propor recomendações metodológicas para os ensaios de controle de qualidade de elementos estruturais de MLC, tendo como pontos de partida as Normas Canadenses CSA 0177-2006, Estadunidenses AITC A190.1-2007, Européia EM 386-2001 e Chilena NCh2148.cR2010, com ênfase principal no sistema de controle de qualidade dos materiais empregados na produção de MLC. Para a avaliação do método proposto foram realizados ensaios com três combinações de espécie-adesivo-tratamento, os mesmos utilizados no projeto de Pesquisa e Desenvolvimento da ANEEL/EESC: "PD220-07 - CABEÇA DE SÉRIE DA CRUZETA VERDE DE MLC". Os resultados mostram que o método proposto é adequado e de suma importância no estudo de MLC estrutural em função da sensibilidade de combinação espécie-adesivo-tratamento.; The Glued Laminated Wood is an engineered product that requires precision manufacturing in all its stages. The finished product can only be tested in laboratory conditions...

Oleoresina de capsaicina como preservante natural de madeira de Pinus sp. contra a ação de fungos de podridão branca e de podridão mole; Capsaicin oleoresin as a natural preservative of Pinus sp. wood against the action of white rot and soft rot fungi

Ziglio, Analine Crespo
Fonte: Biblioteca Digitais de Teses e Dissertações da USP Publicador: Biblioteca Digitais de Teses e Dissertações da USP
Tipo: Tese de Doutorado Formato: application/pdf
Publicado em 08/05/2015 PT
Relevância na Pesquisa
36.53%
Neste trabalho, avaliou-se a eficácia do uso da oleoresina de capsaicina, extraído das pimentas Malagueta, Red Savina e Bhut Jolokia, no tratamento da superfície de madeiras do gênero Pinus sp. com teores de umidade de equilíbrio de 12% e 0%. Os corpos de prova foram submetidos ao ataque de fungos Paecilomyces variotti e Pycnoporus sanguineus. Foi utilizado um preservante sintético conhecido comercialmente como stain para se comparar com a eficiência de preservantes naturais à base de oleoresina de capsaicina. A partir de medidas de ângulo de contato das superfícies das madeiras tratadas com o óleo de capsaicina, observou-se que a pimenta Bhut Jolokia e o preservante stain proporcionavam menor molhabilidade para a espécie de madeira estudada em ambos teores de umidade. O tratamento preservante fez com que a energia de superfície diminuísse se comparada aos valores de amostras de madeiras sem o tratamento preservante devido às contribuições polares e dispersivas. A análise estatística dos resultados, pelo método de Tukey, mostrou que não existe um grupo de resultados estatisticamente equivalente aos obtidos com a amostra testemunha (sem tratamento). As amostras de Pinus sp. a um teor de umidade 0% mostrou-se mais protegida superficialmente quando modificada com a oleoresina extraída da pimenta Bhut Jolokia e o mesmo efeito foi observado estatisticamente para o preservante stain. A técnica de Langmuir foi utilizada para melhor compreender as interações capsaicina/ergosterol...

Ensaios não destrutivos para avaliar o desempenho de madeiras amazônicas tratadas quimicamente; Nondestructive tests to evaluate the perfomance of treated amazonian woods

Teles, Ricardo Faustino
Fonte: Universidade de Brasília Publicador: Universidade de Brasília
Tipo: Tese
POR
Relevância na Pesquisa
26.45%
Tese (doutorado)—Universidade de Brasília, Faculdade de Tecnologia, Departamento de Engenharia Florestal, 2014.; O presente estudo teve como objetivo avaliar o uso e viabilidade de quatro diferentes técnicas de ensaio não destrutivo em campo de apodrecimento e em ensaios de intemperismo acelerado em laboratório utilizando as madeiras de marupá (Simarouba amara), tauari (Couratari sp.) e cumaru (Dipteryx odorata) sem tratamento químico e tratadas quimicamente com o preservante arseniato de cobre cromatado (CCA) tipo C. Para tanto, as madeiras foram usinadas em amostras no formato de estacas para a exposição em campo de apodrecimento e em réguas retangulares para o ensaio de intemperismo acelerado. O tratamento preservativo foi realizado em autoclave industrial sob pressão com CCA-C por meio do processo Bethell de célula cheia. Os métodos empregados para a avaliação não destrutiva foram a técnica de ondas de tensão, ondas ultrassônicas, colorimetria e análise da superfície pela rugosidade. Foi observado que somente as madeiras de marupá e tauari apresentaram penetração e retenção da solução de CCA-C na porção permeável do cerne, sendo o cumaru não impregnado através do processo Bethell. Embora o tratamento químico com a solução preservante CCA tipo C tenha diminuído a velocidade de propagação das ondas de tensão e ultrassônicas nas madeiras de marupá...

Germination-Induced Bioluminescence, a Route To Determine the Inhibitory Effect of a Combination Preservation Treatment on Bacterial Spores

Ciarciaglini, Gianni; Hill, Philip J.; Davies, Ken; McClure, Peter J.; Kilsby, Derrick; Brown, Martyn H.; Coote, Peter J.
Fonte: American Society for Microbiology Publicador: American Society for Microbiology
Tipo: Artigo de Revista Científica
Publicado em /09/2000 EN
Relevância na Pesquisa
26.41%
In this work, we have used spores of Bacillus subtilis that specifically induce bioluminescence upon initiation of germination as a rapid, real-time monitor of the effects of preservative treatments on germination. Using this tool, we have demonstrated that the combination of mild acidity (pH 5.5 to 5.0), lactic acid (0.5%), and a pasteurization step (90°C for 5 min) results in enhanced inhibition of spore germination compared with the effects of the individual treatments alone. Inhibition by the combination treatment occurred as a result of both direct but reversible inhibition, entirely dependent on the physical presence of the preservative factors, and permanent, nonreversible damage to the l-alanine germination apparatus of the spore. However, we were able to restore germination of the preservative-damaged spores unable to germinate on l-alanine by supplementing the medium with the nonnutrient germinant calcium dipicolinic acid. The demonstration that simple combinations of preservative factors inhibit spore germination indicates that food preservation systems providing ambient stability could be designed which do not adhere to the strict limits set by commonly accepted processes and which are based on precise understanding of their inhibitory action.

Perioperative Interstitial Therapy Followed by External Radiation Therapy in the Preservative Management of Early Breast Cancer

Reddy, Eashwer K.; Mansfield, Carl M.; Krishman, Leela; Jewell, William R.
Fonte: PubMed Publicador: PubMed
Tipo: Artigo de Revista Científica
Publicado em /11/1985 EN
Relevância na Pesquisa
36.2%
Treatment of early breast cancer by lumpectomy and irradiation is well accepted. The five- and ten-year results of preservative treatment are comparable to more radical procedures. The technique of perioperative interstitial radiation has several advantages: (1) more accurate placement of the tubes in the tumor bed at the time of surgery; (2) implant volume is kept to a minimum, which improves cosmetic results; and (3) elimination of second general anesthesia for patients considered for implant boost therapy.

Differential pharmacology and clinical utility of preservative-free tafluprost in the treatment of ocular hypertension and glaucoma

Ermiş, Sıtkı Samet
Fonte: Dove Medical Press Publicador: Dove Medical Press
Tipo: Artigo de Revista Científica
EN
Relevância na Pesquisa
26.26%
Glaucoma is a chronic disease requiring lifelong treatment. Discomfort due to medications may affect patients’ quality of life and may cause poor compliance, which leads to poor intraocular pressure control. To minimize the side effects of long-term treatment, preparations with lower benzalkonium chloride concentrations, preservative-free preparations and alternative preservatives have been developed and reported to have a lower rate of side effects. Tafluprost, launched on the ophthalmic market in 2008, is a new 16-phenoxy analogue of prostaglandin F2α, clinically used as an ocular hypotensive agent for the treatment of glaucoma and ocular hypertension. The safety and intraocular pressure-lowering efficacy of tafluprost has been demonstrated in various preclinical and clinical studies.

Latanoprost in the treatment of glaucoma

Alm, Albert
Fonte: Dove Medical Press Publicador: Dove Medical Press
Tipo: Artigo de Revista Científica
Publicado em 26/09/2014 EN
Relevância na Pesquisa
26.24%
Prostaglandins are approved by the European Glaucoma Society guidelines as first-line treatment for glaucoma. This review focuses on latanoprost, an ester prodrug of prostaglandin (PG) F2α, which was the first of the currently available topical PGF2α analogs to be launched for glaucoma or ocular hypertension and which still accounts for the majority of prescriptions. It is better absorbed than the parent compound through the cornea, and peak concentration of the active drug is in the aqueous humor 1–2 hours after topical dosing (15–30 ng/mL). Metabolism occurs mainly in the liver. Latanoprost (0.005%) has been very well studied in clinical trials and meta-analyses that show it to be generally as effective as the other PG analogs (bimatoprost, travoprost, and tafluprost) and more effective than timolol, dorzolamide, and brimonidine. Latanoprost has good short- and long-term safety and tolerability profiles. In common with other prostaglandins, it lacks systemic effects, but can cause ocular adverse events such as conjunctival hyperemia, pigmentation of the iris, periocular skin or eyelashes, hypertrichosis, and ocular surface effects or irritation. Latanoprost is significantly better tolerated than either bimatoprost or travoprost. Patients treated with latanoprost have better compliance and persist with therapy longer than those that are given other drugs. An improved formulation of latanoprost without the preservative benzalkonium chloride has recently been developed. It is as effective as conventional latanoprost...

Excipients of preservative-free latanoprost induced inflammatory response and cytotoxicity in immortalized human HCE-2 corneal epithelial cells

Smedowski, Adrian; Paterno, Jussi J.; Toropainen, Elisa; Sinha, Debasish; Wylegala, Edward; Kaarniranta, Kai
Fonte: PubMed Publicador: PubMed
Tipo: Artigo de Revista Científica
EN
Relevância na Pesquisa
26.5%
Various preservative-free eye drop formulations for glaucoma treatment have been marketed intending to decrease ocular surface side effects and improve tolerability. However, preservative-free eye drops including different solubilizers to dissolve the antiglaucoma drugs may induce detrimental effects in the eye. In this study, we exposed human corneal epithelial cells (HCE-2) for 1, 6, 12, 24 and 48 hours to the first preservative-free (PF) tafluprost (Taflotan®), the recently-launched preservative-free (PF) latanoprost (Monoprost®), preservative benzalkonium chloride (BAK) and the excipient macrogolglycerol hydroxystearate 40 (MGHS40) using dilutions 0.1%, 0.3%, 1.0%, 3.0% and 10.0% of the original products. The cells also were exposed to undiluted PF tafluprost and PF latanoprost once a day for 9 days. Cellular morphology was examined by light microscopy and cell proliferation by Ki-67 fluorescent staining with cell viability being determined by erythrosine staining and the release of lactate dehydrogenase (LDH). Mitochondrial metabolic activity was evaluated with the colorimetric MTT assay. The secretion of interleukin 6 (IL-6) was measured with ELISA. HCE-2 cells displayed no significant morphological changes after PF tafluprost treatment...

Tratamento preservativo da madeira juvenil de Eucalyptus camaldulensis Dehnh: pelo método de substituição de seiva; Preservative treatment of Eucalyptus camaldulensis Dehnh. Juvenile wood by sap displacement method

Fonte: UFLA - Universidade Federal de Lavras Publicador: UFLA - Universidade Federal de Lavras
Tipo: Artigo de Revista Científica Formato: text/html
PT
Relevância na Pesquisa
56.53%
The research analyzed the quality of the preservative treatment of Eucalyptus camaldulensis Dehnh juvenile wood and verified the influence of the inversion of the pieces, in preservative solution, in the distribution, penetration and retention of CCB in treated pieces. Trees of Eucalyptus camaldulensis were collected in the rural area of the municipality of Rio Tinto, Paraíba, Brazil, in a stand aged four years. In the stand were randomly chosen five trees, being three of them with the larger diameter. For the wood treatment it was used the sap displacement method by radial transpiration using a 2% solution of ingredients copper chrome borate (CCB) and compared the effect of the inversion of pieces on the preservative solution. The distribution, penetration and retention were better in reversed pieces when compared with the ones non-reversed in the preservative solution.; Objetivou-se, com esta pesquisa, analisar a qualidade do tratamento preservativo da madeira juvenil de Eucalyptus camaldulensis Dehnh. e verificar a influência da inversão das peças na solução preservativa, na distribuição, na penetração e na retenção do CCB, ao longo das peças tratadas pelo método de substituição de seiva. Árvores de Eucalyptus camaldulensis foram coletadas na Zona Rural do Município de Rio Tinto - PB...

A polysaccharide extracted from sphagnum moss as antifungal agent in archaeological conservation

ZAITSEVA, NINA
Fonte: Quens University Publicador: Quens University
Tipo: Tese de Doutorado Formato: 3804959 bytes; application/pdf
EN; EN
Relevância na Pesquisa
26.25%
On the basis of the well-known preservative properties of Sphagnum moss, a potential opportunity to use moss polysaccharides (Sphagnan) in art conservation was tested. Polysaccharides were extracted from the moss (S. palustre spp.) in the amount of 4.1% of the Sphagnum plant dry weight. All lignocelluloses were removed from this extract as a result of the treatment of the moss cellulose with sodium chlorite. The extracted polysaccharide possessed a strong acidic reaction (pH 2.8) and was soluble in water and organic solvents. The extract was tested on laboratory bacterial cultures by the disk-diffusion method. The antibacterial effect was demonstrated for E. coli and P. aeruginosa (both gram-negative) while Staphylococcus aurelus (gram-positive) was shown to be insensitive to Sphagnum polysaccharides. The antifungal effect of Sphagnum extract was tested by the disk-diffusion method on the spores of seventeen fungal species. These fungi were isolated from ethnographic museum objects and from archaeological objects excavated in the Arctic. Twelve of these isolates appeared susceptible to the extract. The inhibiting effect of the extract was also tested by the modified broth-dilution method on the most typical isolate (Aspergillus spp.). In this experiment...

Avaliação da eficiência do ácido pirolenhoso no tratamento preservativo de taliscas de bambu gigante contra a deterioração por fungos; Evaluation of pyroligneous acid efficiency on preservative treatment of giant bamboo strips against fungi

Jéssica Harue Matsuoka
Fonte: Biblioteca Digital da Unicamp Publicador: Biblioteca Digital da Unicamp
Tipo: Dissertação de Mestrado Formato: application/pdf
Publicado em 27/05/2011 PT
Relevância na Pesquisa
46.5%
O bambu apresenta inúmeras características que o qualificam como um material versátil e que há milhares de anos vem servindo como matéria-prima para diversos fins, fazendo parte da história e da cultura de muitos povos. Muitas pesquisas vêm sendo realizadas acerca da utilização do bambu em setores diversos como da construção civil, movelaria e produção de celulose, visando à promoção de um desenvolvimento mais sustentável. Por se tratar de um recurso renovável, o uso do bambu tem o potencial de minimizar os impactos negativos ao meio ambiente e reduzir os custos da produção, além de apresentar excelentes propriedades físico-mecânicas. Dentre as espécies cultivadas no Brasil, o bambu gigante (Dendrocalamus giganteus Munro), de origem asiática, destaca-se na utilização para construção civil, em aplicações estruturais, arquitetônicas e em movelaria. No entanto, a baixa resistência natural da maioria das espécies ao ataque de organismos xilófagos é ainda uma das principais limitações ao seu uso, implicando em graves prejuízos econômicos. Por este motivo, muitos tratamentos preservativos vêm sendo desenvolvidos, com o intuito de prolongar a vida útil do bambu e aumentar sua resistência contra os agentes deterioradores. Este trabalho teve como objetivo identificar os principais gêneros de fungos deterioradores de bambu e desenvolver um método de tratamento preservativo que fosse eficiente no controle da deterioração do bambu por fungos e que minimizasse as características negativas inerentes aos tratamentos químicos ora existentes e ao impacto ambiental por eles causado. Desta forma...

Short term comparative study of topical 2% carteolol with and without benzalkonium chloride in healthy volunteers

Baudouin, C.; de Lunardo, C.
Fonte: PubMed Publicador: PubMed
Tipo: Artigo de Revista Científica
Publicado em /01/1998 EN
Relevância na Pesquisa
26.5%
AIM—A crossover, randomised double blind study was undertaken in 30 healthy volunteers, in order to compare the tolerance of 2% carteolol with and without preservative in short term use.
METHODS—Complete ophthalmic examinations were performed before and 30, 60, and 180 minutes after instillation of one drop of the solution, and after 3 days of preservative treatment. After a 5 day washout, the same examinations were done with the second drug.
RESULTS—Results showed good general tolerance for both formulations. No significant difference in subjective tolerance, corneal aesthesiometry, punctuate keratitis, Schirmer's test, intraocular pressure (IOP) decrease (about 25% in the two groups at 3 hours, 10% after 3 days of treatment), resting cardiac frequency, or blood pressure was observed. However, break up time was significantly reduced from baseline by preserved carteolol both at 3 hours (10.40 (5.9) seconds to 6.15 (3.9) seconds, p=0.001) and after 3 days (7.72 (5.5) seconds, p=0.04). Preservative free carteolol did not significantly change the break up time (baseline 9.08 (5.7) seconds; 3 hours = 7.88 (5.5) seconds, not significant; day 3 = 8.35 (5.8), non-significant).
CONCLUSIONS—These results confirm that carteolol is well tolerated...

Comparison of Ocular Pulse Amplitude Lowering Effects of Preservative-Free Tafluprost and Preservative-Free Dorzolamide-Timolol Fixed Combination Eyedrops

Seo, Du Ri; Ha, Seung Joo
Fonte: Hindawi Publishing Corporation Publicador: Hindawi Publishing Corporation
Tipo: Artigo de Revista Científica
EN
Relevância na Pesquisa
26.53%
Purpose. To compare the ocular pulse amplitude (OPA) lowering effects of preservative-free tafluprost and dorzolamide-timolol fixed combination (DTFC) using dynamic contour tonometry. Methods. In total, 66 eyes of 66 patients with normal tension glaucoma (NTG) (n = 34) or primary open angle glaucoma (POAG) (n = 32) were included. Patients were divided into two groups: the preservative-free tafluprost-treated group (n = 33) and the preservative-free DTFC-treated group (n = 33). Intraocular pressure (IOP) was measured using Goldmann applanation tonometry (GAT). OPA was measured using dynamic contour tonometry; corrected OPA (cOPA) was calculated at baseline and at 1 week and 1, 3, and 6 months after treatment. Results. After 6 months of treatment, tafluprost significantly reduced IOP (P < 0.001). The OPA lowering effects differed significantly between the two treatment groups (P = 0.003). The cOPA-lowering effect of tafluprost (1.09 mmHg) was significantly greater than that of DTFC (0.36 mmHg) after 6 months of treatment (P = 0.01). Conclusions. Tafluprost and DTFC glaucoma treatments provided marked OPA and IOP lowering effects. Tafluprost had a greater effect than DTFC; thus, this drug is recommended for patients at risk of glaucoma progression...

How Ocular Surface Disease Impacts the Glaucoma Treatment Outcome

Kaštelan, Snježana; Tomić, Martina; Metež Soldo, Kata; Salopek-Rabatić, Jasminka
Fonte: Hindawi Publishing Corporation Publicador: Hindawi Publishing Corporation
Tipo: Artigo de Revista Científica
EN
Relevância na Pesquisa
26.26%
The treatment goals for glaucoma are lowering the intraocular pressure and preservation of vision. Topical hypotensive drops are the standard form of therapy which is often associated with some symptoms of toxicity, ocular inflammation, allergy, or ocular surface disease (OSD). OSD is a common comorbidity in glaucoma patients, and its prevalence with glaucoma increases with age. Use of topical treatment could additionally increase symptoms of OSD mostly due to preservatives added to multidose medication bottles used to reduce the risk of microbial contamination. This toxicity has been particularly associated with BAK, the most commonly used preservative which damages conjunctival and corneal epithelial cells and significantly aggravates OSD symptoms. OSD adversely affects patients' quality of life causing discomfort and problems with vision which in turn may result in noncompliance, lack of adherence, and eventually visual impairment. In the management of glaucoma patients OSD symptoms should not be overlooked. If they are present, topical glaucoma treatment should be adapted by decreasing the amount of drops instilled daily, using BAK-free or preservative-free medication and lubricants if necessary. Awareness of the presence and importance of OSD will in turn improve patients' adherence and compliance and thus ultimately the preservation of long-term vision.

Tratamento preservativo do bambu pelo processo do banho frio

Galvão, Antonio Paulo M.
Fonte: Universidade de São Paulo. Escola Superior de Agricultura Luiz de Queiroz Publicador: Universidade de São Paulo. Escola Superior de Agricultura Luiz de Queiroz
Tipo: info:eu-repo/semantics/article; info:eu-repo/semantics/publishedVersion; ; ; ; Formato: application/pdf
Publicado em 31/12/1966 POR
Relevância na Pesquisa
26.33%
This paper deals with the preservative treatment of Bambusa tuldoides. The stakes 2 meters long were treated by the cold-soaking method in a 5% pentaclorofenol solution for 7 to 8 days. Results on volume, moisture content and air seasoning of stakes are presented. Retentions of preservative solution ranged from 9,3 to 35,8 kilogram per cubic meter (0,58 to 2,24 pounds per cubic foot). The cost year of service of a treated stake was Cr$ 5,58 and Cr$ 14,28 for the untreated. So, the preservative treatment of Bambusa tuldoides stakes is recommended.; O presente trabalho relata resultados obtidos no tratamento preservativo de estacas rachadas e roliças de Bambusa tuldoides. Fornece dados sobre o período de tempo necessário à secagem das estacas, volume, absorções alcançadas nos tratamentos e custos por ano de serviço prestado. Conclui pela conveniência do tratamento preservativo.

Automated measurement of checks at wood surfaces

Christy, Andrew; Senden, Timothy; Evans, Philip David
Fonte: Elsevier Publicador: Elsevier
Tipo: Artigo de Revista Científica
Relevância na Pesquisa
36.33%
Surface checking often disfigures the appearance of wood, but methods of accurately and rapidly measuring checking in wood are not well developed. This paper describes the principal features of a software package that measures the dimensions and numbers of checks in scanned images of weathered wood surfaces. Procedures within the program analyze images searching for brightness minima that satisfy criteria that are characteristic of checks. A black-and-white image is then produced in which checks are shown black on a white background. Further procedures reduce noise in the black-and-white image eliminating artifacts and small checks invisible to the naked eye. The final stage of the analysis identifies and labels checks and quantifies their positions, sizes and shape. Using this software it has been possible to successfully quantify checking in a range of preservative treated wood specimens that have been subjected to natural weathering. The advantages of the system for quantifying checking in wood as well as its limitations are discussed.

ABSORPTION OF NEEM (Azadirachta indica) SEED OIL BY SPLITBAMBOO (Bambusa vulgaris) AT DIFFERENT TEMPERATURE REGIMES AND TREATMENT DURATIONS; ABSORPTION OF NEEM (Azadirachta indica) SEED OIL BY SPLIT-BAMBOO (Bambusa vulgaris) AT DIFFERENT TEMPERATURE REGIMES AND TREATMENT DURATIONS

Erakhrumen, Andrew Agbontalor; Department of Forest Resources Management, Faculty of Agriculture and Forestry, University of Ibadan, Ibadan, Nigeria.
Fonte: FUPEF DO PARANÁ Publicador: FUPEF DO PARANÁ
Tipo: info:eu-repo/semantics/article; info:eu-repo/semantics/publishedVersion; Artigo Avaliado pelos Pares Formato: application/pdf
Publicado em 14/05/2012 POR
Relevância na Pesquisa
36.31%
This study was carried out to evaluate absorption of neem (Azadirachta indica A. Juss) seed oil by split-bamboo (Bambusa vulgaris Schrad. ex J.C. Wendl.) samples at two different treatment temperature (TT) regimes and durations of treatment (DOT). A multivariate linear regression model was also developed for predicting oil absorption (OA) from TT and DOT. Split-bamboo specimens from the same source with same dimension were oven-dried at 103 ± 2 oC, conditioned to 11.76% mean moisture content, and treated by completely soaking a set in oil at an ambient room temperature of 25 ± 2 oC for 24 hours (A) and by soaking the other in hot oil at 60 oC for 4 hours (B). Results obtained showed that test specimens for A and B had mean OA values of 57.02 ± 3.23 and 124.30 ± 7.26 kgm-3 respectively. Regression model developed for predicting OA from TT and DOT had a coefficient of determination of 0.93 with a significant ANOVA result (p < 0.05). Implications of the results obtained were; This study was carried out to evaluate absorption of neem (Azadirachta indica A. Juss) seed oil by split-bamboo (Bambusa vulgaris Schrad. ex J.C. Wendl.) samples at two different treatment temperature (TT) regimes and durations of treatment (DOT). A multivariate linear regression model was also developed for predicting oil absorption (OA) from TT and DOT. Split-bamboo specimens from the same source with same dimension were oven-dried at 103 ± 2 oC...

Evaluation of preservative treatment of bamboo strips with pyroligneous acid; AVALIAÇÃO DO TRATAMENTO PRESERVATIVO DE TALISCAS DE BAMBU COM ÁCIDO PIROLENHOSO

Beraldo, Antonio Ludovico; UNICAMP; Matsuoka, Jessica Harue
Fonte: FUPEF DO PARANÁ Publicador: FUPEF DO PARANÁ
Tipo: info:eu-repo/semantics/article; info:eu-repo/semantics/publishedVersion; Artigo Avaliado pelos Pares Formato: application/pdf
Publicado em 04/10/2013 POR
Relevância na Pesquisa
46.26%
AbstractBamboo presents a low natural resistance to decay, which constitutes one of the major limitations to its use. This study aims to evaluate pyroligneous acid effect against fungal bamboo deterioration through an accelerated laboratory decay with testing reference (without treatment) and treated specimens with the product diluted in boiling water at (0%, 5%, 10%, 20% and 30%) in different immersion times (15, 45, 90, and 180 minutes). Bamboo splits were evaluated after 6 and 16 weeks of exposure. Visual inspections and non-destructive tests (mass loss and ultrasound at 6 and 16 weeks) and bending (after 16 weeks) were applied to the bamboo strips. Results of the non-destructive tests did not allow to detect the effect of the factors (soil type, immersion time and solution concentration) on these properties. Only a superficial attack was observed by visual inspection, which did not denote mass loss. Immersion time shows a positive effect on modulus of elasticity (Em0) and on modulus of rupture (MOR). Moduli of elasticity and rupture were not influenced by soil type (sterile or natural), or by the concentration of the solution, respectively.Keywords: Giant bamboo; biodeterioration; fungi decay.; A baixa resistência natural do bambu ao ataque de organismos xilófagos constitui uma das principais limitações ao seu pleno uso. O objetivo do presente estudo foi avaliar o efeito do ácido pirolenhoso no tratamento preservativo de taliscas de bambu-gigante contra fungos deterioradores. Para tal...

Triclosan: Destino no Meio Ambiente e Perspectivas no Tratamento de Águas de Abastecimento Público; Triclosan: Fate in the Environment and Perspectives in the Treatment of Public Water Supply

Elaine Regina L. Tiburtius; Universidade Estadual de Ponta Grossa; Elizabeth W. O. Scheffer; Universidade Estadual de Ponta Grossa
Fonte: Revista Virtual de Química Publicador: Revista Virtual de Química
Tipo: ; Formato: binary/octet-stream
Publicado em 01/11/2014 PT
Relevância na Pesquisa
35.99%
Nos últimos anos há uma grande preocupação com os poluentes do grupo de compostos emergentes que são encontrados no meio ambiente em concentrações de ng L-1 a µg L-1. Dentre estes, podemos destacar o composto triclosan, 5-cloro-2-(2,4-diclorofenoxi)fenol, que, devido a sua ação antimicrobiana, é utilizado cada vez mais em produtos de higiene pessoal com ação bactericida e em cosméticos como conservante. A redução da qualidade de água de abastecimento como consequência da remoção incompleta de fármacos e produtos de higiene pessoal tem gerado grande preocupação, uma vez que a exposição a esses produtos pode afetar organismos biológicos. Este trabalho aborda o aporte de triclosan em águas superficiais, seu destino e toxicidade no meio ambiente, os tratamentos convencionais e as novas alternativas para a remediação de águas de abastecimento. DOI: 10.5935/1984-6835.20140075;   In recent years there has been a great concern with the pollutants emerging from the group of compounds that are found in the environment at concentrations ng L-1 to mg L-1. Among these, we highlight the compound triclosan, 5-chloro-2-(2,4-dichlorophenoxy)phenol, which, due to its antimicrobial action, is used in personal care products with bactericidal action  and as preservative in cosmetics. The reduction in the quality of drinking water as a consequence of incomplete removal of pharmaceuticals and personal care products is of great concern since exposure to these products may affect biological organisms. This paper focuses on the discharge of triclosan into water bodies...