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Search Results: 1 - 10 of 351 matches for " Dixon Plot "
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Parameter Estimation in Different Enzyme Reactions  [PDF]
Sudarshan R. Nelatury, Charles F. Nelatury, Mary C. Vagula
Advances in Enzyme Research (AER) , 2014, DOI: 10.4236/aer.2014.21002
Abstract: Enzyme kinetic parameters have been estimated using MATLAB software via the Wilkinson non-linear regression technique. The MATLAB script file written to implement this technique is short and very straightforward. Several software tools are commercially available for this purpose, with many graphical user interface (GUI) features. A routine use of these packages might offer immediate satisfaction of interactive hands-on experience; but in some cases the researcher might wish to write his/her own code and compare the results for further confirmation. Today MATLAB is in use in almost all the schools and laboratories as a standard software tool. So this paper is aimed at helping enzyme researchers to make use of this powerful software for estimation of parameters. It enables the incorporation of the analytical steps behind parameter estimation in an easy-to-follow manner and furnishes better visualization.
Kinetics of Acetylcholinesterase Inhibition of Quisqualis indica Linn. Flower Extract
Penpan Wetwitayaklung,Chutima Limmatvapirat,Thawatchai Phaechamud,Sindhchai Keokitichai
Silpakorn University Science and Technology Journal , 2007,
Abstract: Rangoon creeper (Quisqualis indica Linn.) is a plant of the family Combretaceae. In Thai traditional medicine, its seeds contain oil and quisqualic acid that act as anthelminthic. Its flowers are used against diarrhea and eaten as vegetable. The flower extract gave high total polyphenol contents and showed strong antioxidant activity. In the search for new acetylcholinesterase inhibitors from plant origin, it was demonstrated that methanolic extract of Q. indica flower exhibited this activity. The extract inhibited electric eel acetylcholinesterase in dose dependent manner with an IC50 value of 0.77 μg/ml. The Michaelis-Menten constant (Km) for the hydrolysis of acetylthiocholine iodide was 0.034 mM. The Km value in the presence of the extracts (Kmapp) at first decreased, and then increased by 60-88.9%. The Vmax was 0.017 μM/min/μg protein. The Vmax value in the presence of the extracts (Vmaxapp) decreased by 2.8-52.3%. The estimated value of KI was 1.41 mM, respectively. The Lineweaver-Burk plot, Dixon plot and their replots showed combination of the mixed and partially noncompetitive inhibition.
CT Output Dose Performance-Conventional Approach versus the Dose Equilibrium Method  [PDF]
Ahmad Albngali, Andy Shearer, Wil van der Putten, Brendan Tuohy, Niall Colgan
International Journal of Medical Physics,Clinical Engineering and Radiation Oncology (IJMPCERO) , 2018, DOI: 10.4236/ijmpcero.2018.71002
Abstract: Current output dose measurement in CT is based on (CTDI). The conventional methodology of CT dosimetric performance characterization is not appropriate to modern CT scanners with helical scanning modes, dose modulation, array detectors and multiple slice planes or cone-beam irradiation geometries. AAPM TG 111 report recognizes the shortfall of the CTDI methods and recommends a new technique that more accurately characterizes the dose profile from modern CT scanners, which utilizes a short conventional ion chamber rather than a pencil chamber. We developed and characterize a in-house phantom design using a three separate anatomical regions of clinical scan sequences (Head, chest and abdomen), and determined the equilibrium dose in our dose equilibrium phantom, measured if the attenuation of the beam is the equal to that of CTDI Perspex phantom and compare CTDI dose estimations using a standard pencil chamber to the dose equilibrium phantom measurements. This methodology allows measurements of the accumulated dose for any clinical scan length and allowing measurement of the equilibrium dose. Using the new methodology, we determined that the CTDI approach can underestimate the dose by 25% to 35% and all of our dose values from the water phantom and farmer chamber were independently verified with TLD measurements.
Robust stability test of polytopic family of polynomials: the dixon 's resultant method
Wang,Z.H.; Hu,H.Y.; Küpper,T.;
Latin American applied research , 2003,
Abstract: this paper deals with the d- stability test of a polytope of polynomials when the boundary δ;;d of a given simple connected domain d in the complex plan is described by a polynomial equation, a problem that covers two special but important cases: hurwitz sta- bility and schur stability of a polytope of polynomials. based on the "edge theorem" and the method of dixon 's resultant elimination, a new test approach is presented. by using the presented method, the stability test can be carried out by computing dixon's resultants and solving linear matrix equations. two examples are given to demonstrate the approach.
Tamanho e forma de parcela experimental para cana-de-a?úcar
Igue, Toshio;Espironelo, Ademar;Cantarella, Heitor;Nelli, Erseni Jo?o;
Bragantia , 1991, DOI: 10.1590/S0006-87051991000100016
Abstract: uniformity trial with sugar cane was carried out in the usina da barra, at len?óis paulista, state of s?o paulo, brazil. based on 1,512 yield data of sugar cane harvested in areas of 3.0m2 (basic unit) or 1.5m by 2.0m, 55 different types of plots were simulated. the smith's soil heterogeneity index, b, was estimated. its values varied from 0.2643 to 0.6000, depending on the method employed or on the way of grouping blocks, plots and subplots. using b = 0.6000 in a formula given by smith, x= (b/(1-b)(k1/k2),an area of 6.0m2 would give more information at lower cost. by the maximum curvature method the greatest reduction in the value of coefficient of variation occurs when the plot size varied from 6.0 to 12.0m2. presently, most plots used in sugar cane experiments range from 26.0 to 60.0m2; they are too large in relation to the best size obtained, that is, around 12m2. there are practical advantages in using smaller plots and larger number of replications of treatments in an experiment, because the mean variance is inverselly proportional to the number of replications. reducing the mean variances implies greater chance of detecting significant differences between treatment means. for homogeneous soils, smaller plots (12 to 36m2) may be used efficiently. in heterogeneous soils the plot size has little effect in the magnitude of the index d. the influence of the plot length, in reducing the coefficient of variation, was 2.6 times greater than the plot width. therefore, in order to separate small differences between treatments, it is recommended the use of plots of one line 12m long with 12 replications per treatment or two lines 8m long with 8 replications. the plots considered in this paper are without guard rows.
Ritual de salvación centrado en la Crónica de la Jornada de Omagua y Dorado
Leal Ladrón de Guevara,Alejandra;
Atenea (Concepción) , 2010, DOI: 10.4067/S0718-04622010000100003
Abstract: this comparative study describes the sacred character of the salvation ritual that ap-pears in a corpus conformed by the discourses of the chronicle of the journey of omagua and dorado by francisco vásquez and pedrarías de almesto (1561), with three novels from the xxth century and four readings of pre-columbian texts. in this context, we will apply the genetic model of the myth represented in the bundles of relations in the syntagmatic units of the ritual components (lévi-strauss, 1976) of natural language and its underlying meaning, only comprehensible in the context of an exemplary model present in one of the most important human activities: the ceremony of expiation of guilt mediated through the salvation ritual.
Técnicas experimentais para tomateiro tipo salada sob estufas plásticas
Lopes, Sidinei José;Storck, Lindolfo;Heldwein, Arno Bernardo;Feijó, Sandra;Ros, César Augusto da;
Ciência Rural , 1998, DOI: 10.1590/S0103-84781998000200002
Abstract: an uniformity trial was carried out with tomate plants grown in a plastic greenhouse with an area of 24m x 12m. the total fruit yield of salad tomato cv. monte carlo was evaluated during 11 separat harvest. the basic plot was planted with three plants in the same row. the plants were grown in distances of 0.3m in the same row and by 1,0m between rows. all 24 plots were allocated in ten different rows. the results demonstrate that the completely randomized were more adequate with plots smaller than 18 plants in the same row. the yield evaluation in experiments with different traits using a same cultivar in plastic greenhouse should be conducted up to 30% of total yield. this is importam for more experimental precision and budged economy and time. results showed that the minimal significance difference varies after 30% of the total yield, was harvested for three, nine and eighteen plants in each plot.
CARACTERíSTICAS FLORíSTICAS DE UN BOSQUE DE ROBLE (Quercus humboldtii) EN LA MESETA DE POPAYáN (CAUCA)
OSPINA M,ROMáN; PAZ C,JUAN PABLO;
Biotecnología en el Sector Agropecuario y Agroindustrial , 2012,
Abstract: to study the floristic characteristics of a oak forest (quercus humboldtii) established a plot of 9600 m2 divided into 24 subplots of 20x20 meters, where there was scientific name, diameter at breast height dbh, total height and branching height, light condition 10 cm in each > and quality for individuals with stem diameter at breast height subplot were enrolled 10x10 meter plots to record information about individuals with 1.5 meters in height and dbh > 10 cm and 5x5 plots to record established regeneration tree species < 0,40 meters, palms and large herbaceous. in 0.96 were reported a total of 51 species, grouped 44 genera and 33 botanical families for the three size categories, the most abundant and well distributed in the category > 0.4 m < 1.5 m in height, were palicourea angustifolia and quercus humboldtii, the species with heavier ecological an importance value index ivi were quercus humboldtii 153 and clethra revoluta with 37, while all other species reported low levels of abundance, frequency and basal area. the average density of trees >10 cm in diameter at breast height was 455 ha-1, representing a basal area of 15.8 m2ha-1 indicating that it is a young forest.
Utopía y arcadia en los relatos de Alice Dixon Le Plongeon
Espa?a, Romina;Depetris, Carolina;
Estudios de cultura maya , 2011,
Abstract: the purpose of this paper is to present two possible epistemic models understood as models of interpretation and representation of a reality that accompanied alice dixon le plongeon on her trip around the yucatán peninsula in the second half of the 19th century. to do so, we focused on the articles which, she herself, compiled in here and there in yucatán (1886). in them we analyzed the reconstruction of the mayan past in utopian terms, and the consideration of contemporary yucatán in arcadian terms; the writer finds both models useful, not only to appraise mayan reality but also to criticize the degradation of occidental modern socities of which she was part.
Mason & Dixon: narrazione, storia e verità
Carlo Avolio
Impossibilia : Revista Internacional de Estudios Literarios , 2012,
Abstract: This paper highlights the relationship between history and fiction in Thomas Pynchon'sMason & Dixon and their concern for truth, which appears to be “too innocent, to be left within thereach of anyone in Power”. From this point of view, fiction is a counter-narrative which – opposing thepower structures' version of history – can open new spaces for critical, political and creativeconsciousness. Furthermore, the opposition to the official discourse (to its single version of events) isanalogous in the novel to the critique of mapping and bounding the still unmapped and unboundedAmerican territories: in fact, the straight boundary line (symbolized by the Mason-Dixon Line) revealsitself as an ideological act of violence towards the primordial, complex wholeness of those sameterritories.
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