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Search Results: 1 - 10 of 324946 matches for " Cantliffe Daniel J. "
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Germina??o de sementes de alface sob altas temperaturas
Nascimento, Warley Marcos;Cantliffe, Daniel J.;
Horticultura Brasileira , 2002, DOI: 10.1590/S0102-05362002000100020
Abstract: high temperature during imbibition of lettuce seeds can inhibit germination. several methods to circumvent thermoinhibition and, or thermodormancy have been proposed including resistant germplasm, adjusting the seed production environment, the use of growth hormones and seed priming. the mechanism of action for each of these methodologies appears to be related specifically to endosperm loosening which allows the embryo to grow under high temperature. endosperm loosening has been associated with the induction of endo-b-mannanase at the micropylar end. ethylene may also play an important role in controlling this process.
Germina o de sementes de alface sob altas temperaturas
Nascimento Warley Marcos,Cantliffe Daniel J.
Horticultura Brasileira , 2002,
Abstract: Altas temperaturas durante a embebi o das sementes de alface podem inibir a germina o. Vários métodos para reduzir o problema da termoinibi o e, ou termodormência têm sido propostos, incluindo a utiliza o de germoplasmas tolerantes, o ajuste do ambiente de produ o de sementes, a utiliza o de reguladores de crescimento e o condicionamento osmótico das sementes. Nestas metodologias, o mecanismo de a o parece estar relacionado com o "enfraquecimento" ("amolecimento") do endosperma, que possibilitará o crescimento do embri o sob altas temperaturas. O enfraquecimento do endosperma, tem sido associado com a indu o da enzima endo-b-mananase na regi o da micrópila. O etileno, também pode estar envolvido no controle desse processo.
Ethylene evolution and endo-beta-mannanase activity during lettuce seed germination at high temperature
Nascimento, Warley Marcos;Cantliffe, Daniel James;Huber, Donald John;
Scientia Agricola , 2004, DOI: 10.1590/S0103-90162004000200006
Abstract: high temperatures during lettuce seed imbibition can delay or completely inhibit germination and the endosperm layer appears to restrict the radicle protrusion. the role of endo-b-mannanase during lettuce seed germination at 35°c and the influence of ethylene in endo-b-mannanase regulation were investigated. seeds of 'dark green boston' (dgb) and 'everglades' (eve) were germinated in water, or 10 mmol l-1 of 1-aminocyclopropane-1-carboxylic acid (acc), or 10 mmol l-1 of aminoethoxyvinylglycine (avg), or 20 mmol l-1 of silver thiosulphate (sts). seeds were also primed in polyethylene glycol (peg), or peg + acc, peg + avg, or peg + sts. untreated seeds germinated 100% at 20°c. at 35°c, eve seeds germinated 100%, whereas dgb seeds germinated only 33%. seed priming or adding acc during incubation increased germination at 35°c. higher ethylene evolution was detected in eve than in dgb during germination at 35°c. avg did not inhibit seed germination of dgb at 35°c, but sts did. higher endo-b-mannanase activity was observed in eve compared with dgb seeds. providing acc either during priming or during germination increased endo-b-mannanase activity, whereas avg and sts led to decreased or no activity. ethylene may overcome the inhibitory effect of high temperature in thermosensitive lettuce seeds due to increased endo-b-mannanase, possibly leading to weakening of the endosperm.
Ethylene evolution and endo-b-mannanase activity during lettuce seed germination at high temperature
Nascimento Warley Marcos,Cantliffe Daniel James,Huber Donald John
Scientia Agricola , 2004,
Abstract: High temperatures during lettuce seed imbibition can delay or completely inhibit germination and the endosperm layer appears to restrict the radicle protrusion. The role of endo-beta-mannanase during lettuce seed germination at 35°C and the influence of ethylene in endo-beta-mannanase regulation were investigated. Seeds of 'Dark Green Boston' (DGB) and 'Everglades' (EVE) were germinated in water, or 10 mmol L-1 of 1-aminocyclopropane-1-carboxylic acid (ACC), or 10 mmol L-1 of aminoethoxyvinylglycine (AVG), or 20 mmol L-1 of silver thiosulphate (STS). Seeds were also primed in polyethylene glycol (PEG), or PEG + ACC, PEG + AVG, or PEG + STS. Untreated seeds germinated 100% at 20°C. At 35°C, EVE seeds germinated 100%, whereas DGB seeds germinated only 33%. Seed priming or adding ACC during incubation increased germination at 35°C. Higher ethylene evolution was detected in EVE than in DGB during germination at 35°C. AVG did not inhibit seed germination of DGB at 35°C, but STS did. Higher endo-beta-mannanase activity was observed in EVE compared with DGB seeds. Providing ACC either during priming or during germination increased endo-beta-mannanase activity, whereas AVG and STS led to decreased or no activity. Ethylene may overcome the inhibitory effect of high temperature in thermosensitive lettuce seeds due to increased endo-beta-mannanase, possibly leading to weakening of the endosperm.
A Brief Overview of Amblyaudia  [PDF]
RaeLynn J. Lamminen, Daniel Houlihan
Health (Health) , 2015, DOI: 10.4236/health.2015.78110
Abstract: Amblyaudia, a recent subcategory of auditory processing disorder, is characterized by asymmetrical auditory processing of an individual’s ears. Amblyaudia can result in speech comprehension difficulties, reading difficulties, information processing deficits, and inattention. These difficulties can be mistakenly attributed to Attention Deficit Hyperactivity Disorder (ADHD), Specific Learning Disorders (SLD), depression, anxiety disorders, and communication disorders. Unfortunately, traditional hearing tests do not place the two ears in competition and cannot detect asymmetry. Therefore, students who exhibit these difficulties and have normal performance on traditional hearing tests should be also evaluated for amblyaudia with dichotic listening tests. Amblyaudia can be addressed through dichotic listening tasks that strengthen the non-dominant ear, as well as minor adjustments to the classroom environment. This paper will examine the current literature on amblyaudia and provide a brief overview of the causes, diagnosis, treatments, and prognosis.
Seasonal ARIMA Modeling and Forecasting of Rainfall in Warri Town, Nigeria  [PDF]
Daniel Eni, Fola J. Adeyeye
Journal of Geoscience and Environment Protection (GEP) , 2015, DOI: 10.4236/gep.2015.36015
Abstract:

We obtained historical data of rainfall in Warri Town for the period 2003-2012 for the purpose of model identification and those of 2013 for forecast validation of the identified model. Model identification was by visual inspection of both the sample ACF and sample PACF to postulate many possible models and then use the model selection criterion of Residual Sum of Square (RSS), Akaike’s Information Criterion (AIC) complemented by the Schwartz’s Bayesian Criterion (SBC), to choose the best model. The chosen model was the Seasonal ARIMA (1, 1, 1) (0, 1, 1) process which met the criterion of model parsimony with RSS value of 81.098,773, AIC value of 281.312,35 and SBC value of 289.330,84. Model adequacy checks showed that the model was appropriate. We used the model to forecast rainfall for 2013 and the result compared very well with the observed empirical data for 2013.

Analytical Calculation of the Compton Single Scatter Component of Pencil Beam Scatter Kernel for Scatter Correction in kV Cone Beam CT (kV-CBCT)  [PDF]
Jie Liu, J. Daniel Bourland
International Journal of Medical Physics,Clinical Engineering and Radiation Oncology (IJMPCERO) , 2018, DOI: 10.4236/ijmpcero.2018.72019
Abstract:

The accuracy of conventional superposition or convolution methods for scatter correction in kV-CBCT is usually compromised by the spatial variation of pencil-beam scatter kernel (PBSK) due to finite size, irregular external contour and heterogeneity of the imaged object. This study aims to propose an analytical method to quantify the Compton single scatter (CSS) component of the PBSK, which dominates the spatial distribution of total scatter assuming that multiple scatter can be estimated as a constant background and Rayleigh scatter is the secondary source of scatter. The CSS component of PBSK is the line integration of scatter production by incident primary photons along the beam line followed by the post-scattering attenuation as the scattered photons traverse the object. We propose to separate the object-specific attenuation term from the line integration and equivalently replace it with an average value such that the line integration of scatter production is object independent but only beam specific. We derived a quartic function formula as an approximate solution to the spatial distribution of the unattenuated CSS component of PBSK. The “effective scattering center” is introduced to calculate the average attenuation. The proposed analytical framework to calculate the CSS was evaluated using parameter settings of the On-Board Imager kV-CBCT system and was found to be in high agreement with the reference results. The proposed method shows highly increased computational efficiency compared to conventional analytical calculation methods based on point scattering model. It is also potentially useful for correcting the spatial variant PBSK in adaptive superposition method.

Open-Source Hardware Is a Low-Cost Alternative for Scientific Instrumentation and Research  [PDF]
Daniel K. Fisher, Peter J. Gould
Modern Instrumentation (MI) , 2012, DOI: 10.4236/mi.2012.12002
Abstract: Scientific research requires the collection of data in order to study, monitor, analyze, describe, or understand a particular process or event. Data collection efforts are often a compromise: manual measurements can be time-consuming and labor-intensive, resulting in data being collected at a low frequency, while automating the data-collection process can reduce labor requirements and increase the frequency of measurements, but at the cost of added expense of electronic data-collecting instrumentation. Rapid advances in electronic technologies have resulted in a variety of new and inexpensive sensing, monitoring, and control capabilities which offer opportunities for implementation in agricultural and natural-resource research applications. An Open Source Hardware project called Arduino consists of a programmable microcontroller development platform, expansion capability through add-on boards, and a programming development environment for creating custom microcontroller software. All circuit-board and electronic component specifications, as well as the programming software, are open-source and freely available for anyone to use or modify. Inexpensive sensors and the Arduino development platform were used to develop several inexpensive, automated sensing and datalogging systems for use in agricultural and natural-resources related research projects. Systems were developed and implemented to monitor soil-moisture status of field crops for irrigation scheduling and crop-water use studies, to measure daily evaporation-pan water levels for quantifying evaporative demand, and to monitor environmental parameters under forested conditions. These studies demonstrate the usefulness of automated measurements, and offer guidance for other researchers in developing inexpensive sensing and monitoring systems to further their research.
Happily Ever after: The Use of Stories to Promote Positive Interventions  [PDF]
Daniel J. Tomasulo, James O. Pawelski
Psychology (PSYCH) , 2012, DOI: 10.4236/psych.2012.312A176
Abstract:

People turn to myriad ways to achieve happiness, such as physical pleasures, relationships, or the achievement of goals. Success in these endeavors varies, however, and may not be sustainable. Recent advances in scientific research may be able to help, with a number of studies suggesting that people have the power to increase happiness through intentional activities. Narrative is one of the most pervasive and promising elements of positive interventions, and stories play a significant role both in psychological research and in application. A proposal is made that stories should be used more frequently as a vehicle to demonstrate and encourage the use of positive interventions, and a suggestion is made on how to collect and disseminate them.

Design of an Evacuation Demand Forecasting Module for Hurricane Planning Applications  [PDF]
Gary P. Moynihan, Daniel J. Fonseca
Journal of Transportation Technologies (JTTs) , 2016, DOI: 10.4236/jtts.2016.65024
Abstract: This paper discusses the development and implementation of an evacuation demand forecasting module that was incorporated into a comprehensive decision support system for the planning and management of contraflow operations in the Gulf of Mexico. Contraflow implies the reversing of one direction of a highway in order to permit a substantially increased travel demand exiting away from an area impacted by a natural disaster or any other type of catastrophic event. Correctly estimating the evacuation demand originated from such a catastrophic event is critical to a successful contraflow implementation. One problem faced by transportation officials is the arranging of the different stages of this complex traffic procedure. Both the prompt deployment of resources and personnel as well as the duration of the actual contraflow affect the overall effectiveness, safety and cost of the evacuation event. During this project, researchers from the University of Alabama developed an integral decision support system for contraflow evacuation planning to assist the Alabama Department of Transportation Maintenance Bureau in the evaluation and planning of contraflow operations oriented to mitigate the evacuation burdens of a hurricane event. This paper focuses on the design of the demand forecasting module of such a decision support system.
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