Search results for "square"

Fast-multivariate optimization of chiral separations in capillary electrophoresis: Anticipative strategies

2014

Abstract The design of experiments (DOE) is a good option for rationally limiting the number of experiments required to achieve the enantioresolution (Rs) of a chiral compound in capillary electrophoresis. In some cases, the modeled Rs after DOE analysis can be unsatisfactory, maybe because the range of the explored factors (DOE domain) was not the adequate. In these cases, anticipative strategies can be an alternative to the repetition of the process (e.g. a new DOE), to save time and money. In this work, multiple linear regression (MLR)-steepest ascent and a new anticipative strategy based on a multiple response-partial least squares model (called PLS2-prediction) are examined as post-DOE…

Volatile Organic Compounds (VOCs) for Noninvasive Plant Diagnostics

2013

Borrelia burgdorferi sensu lato in Ixodes ricinus ticks collected from migratory birds in Southern Norway

2010

Abstract Background Borrelia burgdorferi sensu lato (s.l.) are the causative agent for Lyme borreliosis (LB), the most common tick-borne disease in the northern hemisphere. Birds are considered important in the global dispersal of ticks and tick-borne pathogens through their migration. The present study is the first description of B. burgdorferi prevalence and genotypes in Ixodes ricinus ticks feeding on birds during spring and autumn migration in Norway. Methods 6538 migratory birds were captured and examined for ticks at Lista Bird Observatory during the spring and the autumn migration in 2008. 822 immature I. ricinus ticks were collected from 215 infested birds. Ticks were investigated f…

Infection with cagA -Positive and cagA -Negative Types of Helicobacter pylori Among Children and Adolescents with Gastrointestinal Symptoms in Latvia

2003

In order to determine the prevalence of concomitant cagA-positive and cagA-negative Helicobacter pylori genotypes in individual subjects, a group of 56 symptomatic patients (aged 8-18 years) was studied. Among 31 patients culture-positive for Helicobacter pylori, only cagA-positive colonies were isolated from 18 patients, both cagA-positive and cagA-negative genotypes were isolated from 4 patients, and in 9 patients all of the individual colonies isolated were cagA-negative, but in seven of them a pool of colonies was positive for cagA. Thus, the presence of both cagA-positive and cagA-negative genotypes in the same individual was identified in 11 of the 31 culture-positive patients tested,…

Peri-implant parameters in head and neck reconstruction: influence of extraoral skin or intraoral mucosa.

2009

Objective: This study is designed to assess dental implants supporting overdentures in edentulous patients with operated head and neck malignancies using parameters to detect peri-implant disease. Material and methods: Thirty-four implants supporting overdentures in 34 oral cancer patients were examined. Clinical parameters [plaque index, probing depth, bleeding on probing (BOP), origin of peri-implant soft tissue, and amount of irradiation] were recorded, and microbiological identification of periodontal pathogens was carried out by DNA–DNA hybridization. To identify yeast species, the samples were cultivated on Sabouraud agar plates and subsequently identified by API 20C AUX plates. An im…

Assessment of Salmonella spp. in feces, cloacal swabs, and eggs (eggshell and content separately) from a laying hen farm.

2011

Microbial pathogens of the genus Salmonella are among the leading causes of foodborne illness in the world. The present study was done on a laying hen farm with a Salmonella enterica serovar Enteritidis-positive result according to the testing specified by European regulation 2160/2003. The aim of this study was to compare the Salmonella contamination on a laying hen farm with the Salmonella presence in the hen eggs. The strains were isolated by ISO method 6579:2002 (standard method for the detection of Salmonella spp. in the European regulation for food and animal feeding stuffs, animal feces, and environmental samples from the primary production stage, including poultry farms) and were co…

Participation Profiles and Socialisation into Dance Among Non‐Professional Dancers

1997

Abstract The study was designed to determine how individuals become socialised into folk, competitive ballroom, ballet and modern dance through an investigation of background variables, the influence of significant others and the participation profiles of dancers, and the identification of those socialization and involvement variables that best discriminate among different groups of dancers. The subjects were 308 adolescent and adult dancers of at least 16 years of age who had pursued their main dance form for a minimum of three years. The data were collected by questionnaire, supplemented with some additional data gathered through personal interviews. Differences between the four dance gro…

What is the best fitting function? Evaluation of lactate curves with common methods from the literature

2015

Using the lactate threshold for training prescription is the gold-standard, although there are several open questions. One open question is: What is the best fitting method for the load-lactate data points? This investigation re-analyses over 3500 lactate diagnostic datasets in swimming. Our evaluation software examines six different fitting methods with two different minimization criteria (RMSE and SE). Optimization of parameters of the functions is put in excecution with gradient descent. From a mathematical point of view, the double phase model, which consists of two linear regression lines, shows the least errors (RMSE min 0.254 ± 0.172; SE min 0.311 ± 0.210). However, this method canno…

Single imputation method of missing values in environmental pollution data sets

2006

Abstract Missing data represent a general problem in many scientific fields above all in environmental research. Several methods have been proposed in literature for handling missing data and the choice of an appropriate method depends, among others, on the missing data pattern and on the missing-data mechanism. One approach to the problem is to impute them to yield a complete data set. The goal of this paper is to propose a new single imputation method and to compare its performance to other single and multiple imputation methods known in literature. Considering a data set of PM 10 concentration measured every 2 h by eight monitoring stations distributed over the metropolitan area of Paler…

Lietotāja vadīts reljefa ģenerēšanas algoritms

2020

Līdzās datorgrafikas attīstībai arī kino un datorspēļu industrija attīstījušas tālu uz priekšu. Tehnoloģijas mainās un atjaunojas tik strauji, ka pieprasījums pēc kvalitatīvākiem un plašākiem ainavu reljefiem nekad nezūd. Manuāla zīmēšana būtu milzīga laiks un naudas patēriņš. Jau 20.gs. 80. gados, speciālisti izveidojuši reljefa ģenerēšanas algoritmus, kuru uzdevums ir apvidus atveidošana pēc iespējas tuvāk dabā esošajiem reljefa paraugiem. Mūsdienās pastāv jau vairākas reljefa ģenerēšanas programmas, tomēr tās ir dārgas un izvirza augstas prasības datora veiktspējai. Tas nozīmē, ka šādu programmatūru nespēj izmantot ikviens datorgrafikā ieinteresētais. Šo problēmu varētu atrisināt vienkār…