oalib

Publish in OALib Journal

ISSN: 2333-9721

APC: Only $99

Submit

Any time

2020 ( 10 )

2019 ( 615 )

2018 ( 704 )

2017 ( 696 )

Custom range...

Search Results: 1 - 10 of 401319 matches for " Ronja M. Frenzel "
All listed articles are free for downloading (OA Articles)
Page 1 /401319
Display every page Item
Development and Validation of a Smartphone Heart Rate Acquisition Application for Health Promotion and Wellness Telehealth Applications
Mathew J. Gregoski,Martina Mueller,Alexey Vertegel,Aleksey Shaporev,Brenda B. Jackson,Ronja M. Frenzel,Sara M. Sprehn,Frank A. Treiber
International Journal of Telemedicine and Applications , 2012, DOI: 10.1155/2012/696324
Abstract: Objective. Current generation smartphones' video camera technologies enable photoplethysmographic (PPG) acquisition and heart rate (HR) measurement. The study objective was to develop an Android application and compare HRs derived from a Motorola Droid to electrocardiograph (ECG) and Nonin 9560BT pulse oximeter readings during various movement-free tasks. Materials and Methods. HRs were collected simultaneously from 14 subjects, ages 20 to 58, healthy or with clinical conditions, using the 3 devices during 5-minute periods while at rest, reading aloud under observation, and playing a video game. Correlation between the 3 devices was determined, and Bland-Altman plots for all possible pairs of devices across all conditions assessed agreement. Results. Across conditions, all device pairs showed high correlations. Bland-Altman plots further revealed the Droid as a valid measure for HR acquisition. Across all conditions, the Droid compared to ECG, 95% of the data points (differences between devices) fell within the limits of agreement. Conclusion. The Android application provides valid HRs at varying levels of movement free mental/perceptual motor exertion. Lack of electrode patches or wireless sensor telemetric straps make it advantageous for use in mobile-cell-phone-delivered health promotion and wellness programs. Further validation is needed to determine its applicability while engaging in physical movement-related activities. 1. Introduction Many cellular phones now possess high-speed data transmission capabilities (e.g., 3G, 4G) and have embedded microprocessors (e.g., Bluetooth, ANT) with the capability to wirelessly connect to external devices. As a result, cell phones offer several advantages over desktop or laptop computers in telemonitoring-related applications such as higher population penetration, increased privacy, lower cost to purchase, easier ability to transport, and overall increased personal convenience of use [1, 2]. Cell phones are widely used in telemonitoring serving as a conduit for receiving biohealth information from portable medical devices (e.g., blood pressure, glucose and pulse oximeter monitors, weight scales) and mobile sensors (e.g., physical activity; accelerometer counts, heart rate, respiration rate, pulse pressure via chest- or armbands, and wireless electrodes). Once cell phones have received the pertinent information, it is microprocessed, encrypted, and the data packets are transferred to some form of localized or web-based server for secondary processing. At the server level, the data packets are organized into a
Modelling dielectric and magnetic properties of ferroconcrete
T. Frenzel,M. Koch
Advances in Radio Science : Kleinheubacher Berichte , 2008,
Abstract: This contribution discusses the modelling and parameterization of dielectric and magnetic properties of ferroconcrete by using numerical electromagnetic field analysis software. The software is based on the Method of Moments (MoM). The shielding effectiveness (SE) of the ferroconcrete DUT was already measured in a study by order of the government. According to these results, the ferroconcrete DUT is modelled and calculated. Therefore the DUT is subdivided into two parts. The first part represents the reinforcement mesh; the second part represents the lossy concrete with complex permittivity. Afterwards, the reflection and transmission properties of numerical analysed building materials are validated and compared with the measurement results in a frequency range of 30–1000 MHz.
Shielding effectiveness of original and modified building materials
T. Frenzel,J. Stumpf,M. Koch
Advances in Radio Science : Kleinheubacher Berichte , 2007,
Abstract: This contribution deals with the determination of the shielding effectiveness of building materials used for office, factory and government buildings. Besides the examination of standard materials, measurements were also performed on modified materials, e.g. ferro concrete with enhanced shielding effectiveness due to a changed mixture or structure of the reinforcement. The measurements of original and modified materials were carried out in a fully anechoic room (FAR) according to IEEE 299-1997 from 80 MHz up to 10 GHz.
MALDI-TOF Mass Spectrometric Analysis of Brain Tumor Cyst Fluid Reveals a Protein Peak Corresponding to ApoC1 and LuzP6  [PDF]
Mathias Groll, Jochen Frenzel, Matthias Krause, Anne Sch?nzer, Wolf Müller, Klaus Eschrich, Ulf Nestler
Open Journal of Modern Neurosurgery (OJMN) , 2018, DOI: 10.4236/ojmn.2018.83021
Abstract: Objectives: SELDI-TOF and MALDI-TOF mass spectrometry (MS) are laser desorption technologies that allow for proteomic examination of molecular masses in small amounts of samples. In a precedent study, the feasibility of SELDI-TOF MS assessment of proteins in cerebrospinal fluid and tumor cyst fluid had been shown. In the present study, we analyzed whether MALDI-TOF MS examination of these fluids leads to comparable results. Methods: During neurosurgical intervention, cyst fluids from 24 glioblastomas and 15 metastases were collected. As control, cerebrospinal fluid samples from 23 patients were obtained. The samples were prepared using a protocol optimized for MALDI-TOF MS. Mass spectra were recorded and peaks were extracted, characterized by masses and relative intensities. These peaks were analyzed for statistically significant differences between the diagnosis groups and compared to SELDI-TOF MS data. Results: 41 protein peaks known from the SELDI-TOF MS analysis could be confirmed by MALDI-TOF MS, and the cellular expression of the proteins LuzP6 and ApoC1, corresponding to the protein peaks 6433 and 6632, was shown immunohistochemically in glioblas-toma tissue. The MALDI-TOF spectrometry extends the range of analysis down to 1.4 kDa, whereas the upper detection limit lies below 23 kDa. Discussion: The presented proteomic approach yields an inventory of protein masses, found in the tumor cyst at the time of puncture. It does not reveal pathophysiologic, metabolic or secretory pathways that lead to the presence of proteins in the cyst. These have to be assessed immunohistochemically or on mRNA level in the surrounding tumor cells. Conclusion: MALDI-TOF MS of tumor cyst fluid discloses protein sizes, overexpressed or lost in tumor tissue. A thorough proteomic work-up is needed to identify the underlying proteins and metabolic pathways.
INTAKE AND ACTIVITY BEHAVIOR OF STEERS FINISHED IN FEEDLOT WITH CORN SILAGES OF DIFFERENT PARTICLE SIZES AND CUTTING HEIGHTS COMPORTAMENTO INGESTIVO E DE ATIVIDADES DE NOVILHOS CONFINADOS COM SILAGENS DE MILHO DE DIFERENTES TAMANHOS DE PARTíCULA E ALTURAS DE COLHEITA
Mikael Neumann,Jo?o Restle,Paulo Roberto Frenzel Frenzel Mühlbach,José Laerte N?rnberg
Ciência Animal Brasileira , 2009,
Abstract: The experiment was conducted at the Núcleo de Produ o Animal (Nupran) of the Universidade Estadual do Centro Oeste do Paraná (Unicentro). The trial aimed to evaluate the effect of particle size (small: between 0.2 and 0.6 cm or large: between 1 and 2 cm) and cutting height (low cut: 15.2 cm or high cut: 38.6 cm) of corn plant for silage on the behavior of confined steers. The treatments were: TPB – small particle size with low cut height; TGB – large particle size with low cut height; TPA – small particle size with high cut height; and TGA – large particle size with high cut height. The roughage:concentrate ratio was 62.7%:37.3%. No significant difference was detected among treatments for the time spent by the animals on feed consumption activity (4.19; 4.03; 4.13 and 4.01 h, respectively). Significant interaction between cutting height and particle size was observed for the time spent with rumination. For the silage with high cutting the time spent with rumination was significantly higher for the large particle size (9.47 h) in relation to the small particle size (7.98 h), however, for the low cutting the difference between the large particle size (9.04 h) and the small particle size (8.73 h) was not significant. KEY WORDS: Animal behavior, free time, particle separator, rumination time, selectivity. O experimento foi desenvolvido com o objetivo de avaliar o efeito do tamanho de partícula (pequena: entre 0,2 e 0,6 cm ou grande: entre 1 e 2 cm) e da altura de corte de plantas de milho colhidas para ensilagem (baixo:15,2 cm ou alto: 38,6 cm), sobre o comportamento ingestivo e das atividades de novilhos confinados, constituindo-se os tratamentos: TPB – silagem de partícula pequena com altura de corte baixo; TGB – silagem de partícula grande com altura de corte baixo; TPA – silagem de partícula pequena com altura de corte alto; e TGA – silagem de partícula grande com altura de corte alto. A rela o volumoso:concentrado foi de 62,7%:37,3%. N o se detectou diferen a significativa entre os tratamentos no tempo gasto pelos animais na atividade de consumo alimentar (4,19; 4,03; 4,13 e 4,01 h, respectivamente). Houve intera o significativa entre altura de colheita e tamanho de partículas para a atividade de rumina o. Nas silagens de corte alto o tempo gasto com rumina o foi significativamente maior para partículas grandes (9,47 h) em rela o às partículas pequenas (7,98 h), porém, no corte baixo, a diferen a entre partículas grandes (9,04 h) e pequenas (8,73 h) n o foi significativa. PALAVRAS-CHAVES: Capacidade de sele o, comportamento animal, separador de
Desempenho de bezerros da ra?a holandesa com desaleitamento aos 28 ou 56 dias de idade, com ou sem aditivo à base de oligossacarídeo de manana
Sandi, Décio;Mühlbach, Paulo Roberto Frenzel;
Ciência Rural , 2001, DOI: 10.1590/S0103-84782001000300021
Abstract: twenty four holstein bull calves were the subject of a commpletely randomized experimental design with a 2x2 factorial arrangement (weaning at the age of 28 or 56 days, with or without mannanoligosaccharide additive) and six replicates per treatment. there was no interaction between weaning periods and additive use. weaning at 28 days of age, as compared to 56 days, resulted in lower final body weight, lower daily weight gain, higher concentrate intake, lower total dry matter intake and lower feed efficiency. initial and final body measurements of withers heights, thoracic and abdominal girth presented no differeces, in spite of a lower average daily growth rate of thoracic girth in calves weaned at 28 days. total individual and per kg costs of feeding, medication and veterinary care were lovwer for28 days weaned calves. additive use did not affect body measurements but increased final and daily body weight gains, improved feed conversion and reduced average cost per kg body weight gain.
Wetland restoration and methanogenesis: the activity of microbial populations and competition for substrates at different temperatures
V. Jerman, M. Metje, I. Mandi -Mulec,P. Frenzel
Biogeosciences (BG) & Discussions (BGD) , 2009,
Abstract: Ljubljana marsh in Slovenia is a 16 000 ha area of partly drained fen, intended to be flooded to restore its ecological functions. The resultant water-logging may create anoxic conditions, eventually stimulating production and emission of methane, the most important greenhouse gas next to carbon dioxide. We examined the upper layer (~30 cm) of Ljubljana marsh soil for microbial processes that would predominate in water-saturated conditions, focusing on the potential for iron reduction, carbon mineralization (CO2 and CH4 production), and methane emission. Methane emission from water-saturated microcosms was near minimum detectable levels even after extended periods of flooding (>5 months). Methane production in anoxic soil slurries started only after a lag period of 84 d at 15°C and a minimum of 7 d at 37°C, the optimum temperature for methanogenesis. This lag was inversely related to iron reduction, which suggested that iron reduction out-competed methanogenesis for electron donors, such as H2 and acetate. Methane production was observed only in samples incubated at 14–38°C. At the beginning of methanogenesis, acetoclastic methanogenesis dominated. In accordance with the preferred substrate, most (91%) mcrA (encoding the methyl coenzyme-M reductase, a key gene in methanogenesis) clone sequences could be affiliated to the acetoclastic genus Methanosarcina. No methanogens were detected in the original soil. However, a diverse community of iron-reducing Geobacteraceae was found. Our results suggest that methane emission can remain transient and low if water-table fluctuations allow re-oxidation of ferrous iron, sustaining iron reduction as the most important process in terminal carbon mineralization.
Wetland restoration and methanogenesis: the activity of microbial populations and competition for substrates at different temperatures
V. Jerman,M. Metje,I. Mandi?-Mulec,P. Frenzel
Biogeosciences Discussions , 2009,
Abstract: Ljubljana marsh in Slovenia is a 16 000 ha area of partly drained fen, intended to be flooded to restore its ecological functions. The resultant water-logging may create anoxic conditions, eventually stimulating production and emission of methane, the most important greenhouse gas next to carbon dioxide. We examined the upper layer (~30 cm) of Ljubljana marsh soil for microbial processes that would predominate in water-saturated conditions, focusing on the potential for iron reduction, carbon mineralization (CO2 and CH4 production), and methane emission. Methane emission from water-saturated microcosms was near minimum detectable levels even after extended periods of flooding (>5 months). Methane production in anoxic soil slurries started only after a lag period and was inversely related to iron reduction, which suggested that iron reduction out-competed methanogenesis for electron donors, such as H2 and acetate. Methane production was observed only in samples incubated at 14–38°C. At the beginning of methanogenesis, acetoclastic methanogenesis dominated. In accordance with the preferred substrate, most (91%) mcrA (encoding the methyl coenzyme-M reductase, a key gene in methanogenesis) clone sequences could be affiliated to the acetoclastic genus Methanosarcina. No methanogens were detected in the original soil. However, a diverse community of iron-reducing Geobacteraceae was found. Our results suggest that methane emission can remain transient and low if water-table fluctuations allow re-oxidation of ferrous iron, sustaining iron reduction as the most important process in terminal carbon mineralization.
Wetland restoration and methanogenesis: the activity of microbial populations and competition for substrates at different temperatures
V. Jerman,M. Metje,I. Mandi?-Mulec,P. Frenzel
Biogeosciences (BG) & Discussions (BGD) , 2009,
Abstract: Ljubljana marsh in Slovenia is a 16 000 ha area of partly drained fen, intended to be flooded to restore its ecological functions. The resultant water-logging may create anoxic conditions, eventually stimulating production and emission of methane, the most important greenhouse gas next to carbon dioxide. We examined the upper layer (~30 cm) of Ljubljana marsh soil for microbial processes that would predominate in water-saturated conditions, focusing on the potential for iron reduction, carbon mineralization (CO2 and CH4 production), and methane emission. Methane emission from water-saturated microcosms was near minimum detectable levels even after extended periods of flooding (>5 months). Methane production in anoxic soil slurries started only after a lag period of 84 d at 15°C and a minimum of 7 d at 37°C, the optimum temperature for methanogenesis. This lag was inversely related to iron reduction, which suggested that iron reduction out-competed methanogenesis for electron donors, such as H2 and acetate. Methane production was observed only in samples incubated at 14–38°C. At the beginning of methanogenesis, acetoclastic methanogenesis dominated. In accordance with the preferred substrate, most (91%) mcrA (encoding the methyl coenzyme-M reductase, a key gene in methanogenesis) clone sequences could be affiliated to the acetoclastic genus Methanosarcina. No methanogens were detected in the original soil. However, a diverse community of iron-reducing Geobacteraceae was found. Our results suggest that methane emission can remain transient and low if water-table fluctuations allow re-oxidation of ferrous iron, sustaining iron reduction as the most important process in terminal carbon mineralization.
Desempenho de bezerros da ra a holandesa com desaleitamento aos 28 ou 56 dias de idade, com ou sem aditivo à base de oligossacarídeo de manana
Sandi Décio,Mühlbach Paulo Roberto Frenzel
Ciência Rural , 2001,
Abstract: Vinte e quatro bezerros da ra a Holandesa foram utilizados num experimento com delineamento completamente casualizado, em arranjo fatorial 2x2 (desaleitamento aos 28 ou 56 dias, com ou sem a adi o de oligossacarídio de manana à dieta), e seis repeti es por tratamento. N o houve intera o entre os fatores período de aleitamento e uso ou n o de aditivo. O desaleitamento aos 28 dias, em compara o com 56 dias, resultou, aos 56 dias de idade, em menor peso final, menor ganho médio diário de peso, maior consumo de concentrado, menor consumo total de matéria seca e pior convers o alimentar. N o houve diferen as em rela o às medidas corporais iniciais e finais de altura de cernelha, perímetro torácico e abdominal, embora o desaleitamento aos 28 dias tenha diminuído o ganho médio diário de perímetro torácico. Em um levantamento dos custos de alimenta o, medicamentos e m o-de-obra veterinária, os animais desaleitados aos 28 dias apresentaram menor custo total individual e menor custo por kg de ganho de peso. O emprego do aditivo n o afetou as dimens es corporais, porém resultou em maior ganho de peso, final e diário, e melhor convers o alimentar, reduzindo o custo médio por kg de ganho de peso.
Page 1 /401319
Display every page Item


Home
Copyright © 2008-2017 Open Access Library. All rights reserved.