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Controlled release studies of 5-Fluorouracil through poly (vinyl caprolactum-co-vinyl acetate) microspheres
Yerriswamy B,Reddy C,Prasad C,Subha M.C.S
Asian Journal of Pharmaceutics , 2010,
Abstract: Novel poly (vinyl caprolactam-co-vinyl acetate) microspheres were crosslinked with N′, N′ methylene bisacrylamide (NNMBA) prepared by free radical emulsion polymerization. This was done by using vinyl caprolactam, vinyl acetate, and NNMBA with varying amounts. 5-Fluorouracil (5-FU) is an anticancer drug which was mixed into these microspheres during in situ polymerization. These microspheres were characterized by using differential scanning calorimetry (DSC), X-ray diffraction (XRD), and scanning electron microscopy (SEM) techniques. XRD and DSC results indicated that there was uniform distribution of 5-FU drug particles in microspheres, and SEM pictures suggest that the microspheres are in spherical shape. Both encapsulation efficiency and release patterns are found to be dependent on the amount of crosslinking agent and amount of drug loaded. From the results of drug release kinetic studies, an anomalous and nonFickian behavior was observed in the present studies. Furthermore, in vitro release studies indicated the release of 5-FU up to 10 hours.
A new electroless gold plating technique
M.C.S.
Gold Bulletin , 1981, DOI: 10.1007/BF03216553
Abstract:
Tuberiza??o de dois cultivares de batata sob aplica??o de sulfoniluréias
Novo, M.C.S.S.;Miranda Filho, H.S.;
Planta Daninha , 2006, DOI: 10.1590/S0100-83582006000100015
Abstract: potato response to simulated tank contamination of three sulfonylurea herbicides was evaluated in a pot study in águas da prata, s?o paulo, brazil. the purpose of the trial was to study the effect of subdoses of the herbicides metsulfuron-methyl, nicosulfuron and sulfometuron-methyl on yield and tuber quality of two potato cultivars. metsulfuron-methyl, nicosulfuron and sulfometuron-methyl were applied in post-emergence on 'atlantic' and 'lady rosetta' cultivars at rates corresponding to 0, 0.00001, 0.0001, 0.001, 0.01, 0.1 and 1 times the recommended rate. at harvest, root fresh weight, number and fresh weight of normal and malformed tubers and total yield of tubers were determined. none of the rates applied killed the potato plants.sulfonylurea application affected tuber development causing anomalies but these also varied with products and rates. 'atlantic' yield losses were greater than 'lady rosetta's yield losses when metsulfuron-methyl was applied. 'lady rosetta' tuber yield was more sensitive than that of'atlantic to nicosulfuron and sulfometuron-methyl.
Efeitos de misturas de napropamide e simazine no controle de mono e dicotiledoneas em cafeeiros novos Effects of napropamide and simazine mixtures on the control of mono and dicotyledon on new coffee trees
L.S.P. Cruz,M.C.S.S. Novo
Planta Daninha , 1980, DOI: 10.1590/s0100-83581980000200009
Abstract: Com a finalidade de se conhecer a a o de misturas de napropamide e simazine no controle de plantas daninhas mono e dicotiled neas em cafee iros com dois anos de idade, foi conduzido um experimento de campo em Araras, SP, em 1979/80. 0 delineamento foi o de blocos ao acaso com nove tratamentos e quatro repeti es. Os tratamentos foram os seguintes: napropamide a 2,00 kg e 3,00 kg/ha; simazine a 0,50 kg e 0,75 kg/ha; e, misturas de 2,00 kg/ha de napropamide com 0,50 kg e 0,75 kg/ha de simazine, e de 3,00 kg/ha de napropamide também com 0,50 kg e 0,75 kg/ha de simaz ine . Constou do experimento ainda, uma testemunha sem herbicida. Aos 45 dias após a aplica o dos herbicidas foi feita uma contagem das plantas daninhas, e a cada 15 dias, até aos 90 dias da aplica o, foram realizadas observa es visuais de porcentagem de infesta o do mato. Nestas mesmas épocas também foram realizadas observa es sobre sintomas de fi totoxicidade causados pelos herbicidas aos cafeeiros. As plantas daninhas presentes em maior número no ensaio foram as monocotiled neas capim - de-colch o - Digitaria horizontalis Willd e capimpé -de-galinha Eleusine indica (L.1 Gaertn, e as dicotiled neas carurú-de-mancha - Amaranthus viridis L. e pic o-preto - Bidens pilosa L. Como era esperado, as misturas foram superiores aos tratamentos com herbicidas isolados. sendo bastante eficientes no controle das mono e dicotiled neas que incidiram no experimento. Todos os tratamentos com 0.75 k ' ha de simazine apresentaram leves sintomas de fitotoxicidade, limitados a algumas folhas dos cafeeiros. até a última observa o realizada. A field experiment was conducted in Araras in 1979/80 with the purpose to study the effects of mixture of napropamide and simazine on the control of mono and dicotyledons weeds in two years old coffee trees. The experiment was in randomised blocks with nine treatments and four repplications. The treatments were the following: napropamide at 2.00 and 3.00 kg/ha; simazine at 0.50 and 0.75 kg/ha; and tank mixtures of 2.00 kg/ha of napropamide with 0.50 and 0.75 kg/ha of simazine; and 3.00 kg/ha of napropamide also with 0.50 and 0.75 kg/ha of simazine. A treatment without herbicide was also included in the experiment. A weed count was done 45 days after the aplication of the herbicides, and every 15 days until the 90th day, visual observations were done to detect the percentage of weed infestations. At that time it was also done on the fitotoxicity symptoms caused by herbicides on the coffee trees. The most frequent weeds present in the trial were, Digitaria horizontalis Wil
Influência da velocidade de avan?o do rebolo nos danos de a?os endurecidos retificados
Alves, M.C.S.;Bianchi, E.C.;Aguiar, P.R.;
Matéria (Rio de Janeiro) , 2008, DOI: 10.1590/S1517-70762008000400009
Abstract: the world tendency is the increase of the productivity and the production of pieces more and more sophisticated, with high degree of geometric and dimensional tolerances, with good surface finish and low cost. rectification is responsible for the final finish in the machining process of a material. however, damages generated in this production phase affect all the resources used in the previous processes. great part of the problems happenning in the rectification process is due to the enormous temperature generated in this activity because of the machining conditions. the dive speed, which is directly related to the productivity, is considered responsible for the damages that occur during rectification, limiting its values to those that do not cause such damages. in this work, through the variation of the dive speed in the process of cylindrical grinding of type abnt d6 steel, rationalizing the application of two cutting fluids and using a cbn (cubic boron nitrate) abrasive wheel with vitrified blond, the influence of the dive speed on the surface damages of hardened steels was evaluated. the results allowed to say that the dive speed, associated to an efficient cooling and lubrication, didn't provoke thermal damages (including heated zones, cracks and tension stresses) to the material. residual stresses and the roughness of rectified materials presented a correlation with the machining conditions. the work concluded that it is possible to increase the productivity without provoking damages in the rectified components.
Construction and growth properties of bovine herpesvirus type 5 recombinants defective in the glycoprotein E or thymidine kinase gene or both
Brum, M.C.S.;Weiblen, R.;Flores, E.F.;Chowdhury, S.I.;
Brazilian Journal of Medical and Biological Research , 2010, DOI: 10.1590/S0100-879X2009007500008
Abstract: bovine herpesvirus type 5 (bohv-5) is an important pathogen of cattle in south america. we describe here the construction and characterization of deletion mutants defective in the glycoprotein e (ge) or thymidine kinase (tk) gene or both (ge/tk) from a highly neurovirulent and well-characterized brazilian bohv-5 strain (sv507/99). a ge-deleted recombinant virus (bohv-5 ge?) was first generated in which the entire ge open reading frame was replaced with a chimeric green fluorescent protein gene. a tk-deleted recombinant virus (bohv-5 tk?) was then generated in which most of the tk open reading frame sequences were deleted and replaced with a chimeric β-galactosidase gene. subsequently, using the bohv-5 ge? virus as backbone, a double gene-deleted (tk plus ge) bohv-5 recombinant (bohv-5 ge/tk?) was generated. the deletion of the ge and tk genes was confirmed by immunoblotting and pcr, respectively. in madin darby bovine kidney (mdbk) cells, the mutants lacking ge (bohv-5 ge?) and tk + ge (bohv-5 ge/tk?) produced small plaques while the tk-deleted bohv-5 produced wild-type-sized plaques. the growth kinetics and virus yields in mdbk cells for all three recombinants (bohv-5 ge?, bohv-5 tk? and bohv-5 ge/tk?) were similar to those of the parental virus. it is our belief that the dual gene-deleted recombinant (bohv-5 ge/tk?) produced on the background of a highly neurovirulent brazilian bohv-5 strain may have potential application in a vaccine against bohv-5.
Portable and Airborne Small Footprint LiDAR: Forest Canopy Structure Estimation of Fire Managed Plots
Claudia M.C.S. Listopad,Jason B. Drake,Ron. E. Masters,John F. Weishampel
Remote Sensing , 2011, DOI: 10.3390/rs3071284
Abstract: This study used an affordable ground-based portable LiDAR system to provide an understanding of the structural differences between old-growth and secondary-growth Southeastern pine. It provided insight into the strengths and weaknesses in the structural determination of portable systems in contrast to airborne LiDAR systems. Portable LiDAR height profiles and derived metrics and indices (e.g., canopy cover, canopy height) were compared among plots with different fire frequency and fire season treatments within secondary forest and old growth plots. The treatments consisted of transitional season fire with four different return intervals: 1-yr, 2-yr, 3-yr fire return intervals, and fire suppressed plots. The remaining secondary plots were treated using a 2-yr late dormant season fire cycle. The old growth plots were treated using a 2-yr growing season fire cycle. Airborne and portable LiDAR derived canopy cover were consistent throughout the plots, with significantly higher canopy cover values found in 3-yr and fire suppressed plots. Portable LiDAR height profile and metrics presented a higher sensitivity in capturing subcanopy elements than the airborne system, particularly in dense canopy plots. The 3-dimensional structures of the secondary plots with varying fire return intervals were dramatically different to old-growth plots, where a symmetrical distribution with clear recruitment was visible. Portable LiDAR, even though limited to finer spatial scales and specific biases, is a low-cost investment with clear value for the management of forest canopy structure.
EXPERIMENTOS EM PARCELAS SUBDIVIDIDAS COM TRATAMENTOS PRIMáRIOS EM BLOCOS INCOMPLETOS PARCIALMENTE BALANCEADOS: II. ANáLISE INTRABLOCOS
MORAIS, A.R. de;NOGUEIRA, M.C.S;
Scientia Agricola , 1996, DOI: 10.1590/S0103-90161996000100020
Abstract: the objective of this study was to develop a suitable methodology for the intrablock analysis of experiments in split-plot involving a two-way treatment structure when the design structure for whole plot experimental units is a partially balanced incomplete block design. using the least square procedure expressions were developed to determine the sums of squares of the variance analysis and the justification of the f test.
EXPERIMENTOS EM PARCELAS SUBDIVIDIDAS COM TRATAMENTOS PRIMáRIOS EM BLOCOS INCOMPLETOS PARCIALMENTE BALANCEADOS: II. ANáLISE INTRABLOCOS
MORAIS A.R. de,NOGUEIRA M.C.S
Scientia Agricola , 1996,
Abstract: O objetivo do presente trabalho foi desenvolver uma metodologia adequada para análise intrablocos de experimentos em parcelas subdivididas quando os tratamentos primários est o dispostos em uma estrutura de delineamento em blocos incompletos parcialmente balanceados. Usando o método dos mínimos quadrados foram determinadas as express es para as várias somas de quadrados que comp em a análise de variancia e a composi o do teste F.
CONSERVA O E GERMINA O DE SEMENTES E DESENVOLVIMENTO DE PL NTULAS DA PEREIRA PORTA-ENXERTO TAIWAN NASHI-C
BARBOSA W.,DALL'ORTO F.A.C.,OJIMA M.,NOVO M.C.S.S.
Scientia Agricola , 1997,
Abstract: Pesquisaram-se, por trinta meses, a conserva o e a germina o de sementes, a emergência e o desenvolvimento de plantulas da pereira porta-enxerto Taiwan Nashi-C (Pyrus calleryana Decaisne). Sementes com 12% de umidade armazenadas sob ambiente frio (5-10oC), em frascos de vidro com tampa plástica, mostraram alto poder de conserva o. Germina es de 100% ocorreram até o 9o mês, diminuindo para 97, 94, 83 e 76% no final do 12o, 18o, 24o e 30o mês de armazenamento, com uma emergência, em condi es de ripado, de 88, 89, 81, 76 e 70% respectivamente. Posteriormente ao 12o mês de armazenamento das sementes, a germina o que ocorria próximo aos 35 dias de estratifica o, passou a necessitar mais de 50 dias para emiss o da radícula. As plantulas, com rápido e vigoroso desenvolvimento vegetativo, atingiram 141,5cm de altura e 11,9mm de diametro, em média, após um ano da emergência. O ponto de enxertia foi atingido por 65% dos porta-enxertos aos oito meses de desenvolvimento, com diametro médio de 10,4mm. Cerca de 20% dos indivíduos se apresentaram anormais, com segrega o genética indesejável para fins de forma o de mudas vigorosas de pereira.
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