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Search Results: 1 - 10 of 46169 matches for " Michael Parker "
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Rearing Velocity Impacts on Landlocked Fall Chinook Salmon (Oncorhynchus tshawytscha) Growth, Condition, and Survival  [PDF]
Timothy M. Parker, Michael E. Barnes
Open Journal of Animal Sciences (OJAS) , 2014, DOI: 10.4236/ojas.2014.45031
Abstract: Juvenile landlocked Chinook salmon (Oncorhynchus tshawytscha) (mean ± SD initial weight 2.6 ± 0.7 g, fork length 6.3 ± 0.5) were reared in three different water velocities [0.5, 1.5 and 3.0 body length/s (BL/s)] for four weeks to determine possible effects of water velocity on growth, condition, and survival. Fish were sampled for weight, fork length, condition factor, hepatosomatic index (HSI), viscerosomatic index (VSI), and fin erosion after four weeks of feeding to satiation. At the end of the feeding trial, the fish were handled and transported to simulate stocking, with survival observed over the following 10 d. Following four weeks of feeding, fish reared in 0.5 and 1.5 BL/s had the same growth and food conversion ratio, but fish reared at 3.0 BL/s had a significant reduction in both metrics. Furthermore, fish reared at 1.5 BL/s had a significantly higher condition factor than fish reared in other treatments. No significant differences were found for HSI, VSI, fin erosion, or survival. The results from this study indicate that a moderate velocity (1.5 BL/s), which is necessary for circular tanks to be self-cleaning, is not detrimental to fish growth or condition, but a faster water velocity (3.0 BL/s) negatively affects fish growth and food utilization.
There is no upper bound for the diameter of the commuting graph of a finite group
Michael Giudici,Chris Parker
Mathematics , 2012,
Abstract: We construct a family of finite special 2-groups which have commuting graph of increasing diameter
A Greener Way to Screen Toothpaste for Diethylene Glycol  [PDF]
Yale Fu, Zhigang Hao, Barry Parker, Michael Knapp
American Journal of Analytical Chemistry (AJAC) , 2011, DOI: 10.4236/ajac.2011.28109
Abstract: A method developed for the screening of diethylene glycol (DEG) in toothpaste was released by the FDA in 2007. This method could not only quantify the DEG but also confirm if any potential interfering peak is pre- sent. However, disadvantages of this method such as intermittent shortages of the key reagent acetonitrile and the shorter than expected column-life issues have prompted a search for alternative solutions. An im- provement with an alternate “greener” extraction solvent is presented, and the method comparison and vali- dation are described in this article. The greener extraction solvent, ethanol with limited water, provided a better efficiency for the toothpaste sampling procedures. The limit of detection (LOD) and limit of quantita- tion (LOQ) are 0.0025% and 0.0084% in (w/w) unit, respectively. The sample recovery is 101.2%.
Non-Consumptive Activities on a Public Hunting and Fishing Area  [PDF]
Greg Simpson, Michael E. Barnes, Timothy M. Parker, Jill Voorhees
Natural Resources (NR) , 2014, DOI: 10.4236/nr.2014.514075
Abstract: The activities of all 1513 individuals who visited a public hunting and fishing area near Spearfish, South Dakota, USA, were recorded from May 16 to August 16, 2006. Over the entire period, slightly less than 60% of the visitors were engaged in fishing, and they accounted for nearly 80% of the total visitation time. Over 40% of the visitors were primarily there for non-consumptive (not hunting or fishing) reasons, including touring (sight-seeing), dog training and exercising, and swimming. Less than 1% of the visitors were there for photography. The percentage of visitors fishing decreased from a high of over 65% in the first 31-day period to less than 50% in the third 31-day period, with nearly all of the non-consumptive activities showing a reverse trend. The percentage of visitors swimming or conducting dog activities doubled from the first to third periods. The percentage of time that visitors spent fishing decreased over time, while the time spent on non-consumptive activities increased. However, the increase in non-consumptive activity time was not necessarily in proportion to the increase in the number of visitors involved with non-consumptive activities. By the final period, more visitors were at the area for touring, dogs, and swimming, than for fishing, but fishing still accounted for most of the visitation time. These results indicate an abundance of non-consumptive activities on a public area purchased and maintained with revenue from consumptive hunting and fishing activities, creating the opportunity for user conflicts and potentially threatening the user-pay model of natural resource conservation.
Pro/con ethics debate: Should mechanical ventilation be continued to allow for progression to brain death so that organs can be donated?
Michael Parker, Sam D Shemie
Critical Care , 2002, DOI: 10.1186/cc1542
Abstract: The patient is a previously healthy 17-year-old boy who was transferred by air ambulance from a regional community hospital after nearly drowning. During a boat ride in a lake, the boy fell out of the boat and became entangled and submerged under water for an undetermined period of time. The boy was pulled to shore, where cardiopulmonary resuscitation was begun immediately because of absent vital signs. The boy was brought to the community hospital after cardiorespiratory arrest for approximately 20–30 min. Vital signs were absent when the patient arrived. The patient was given one round of resuscitation medications, after which a heart rate and cardiac output were restored. The patient was transferred to a tertiary care paediatric hospital.On arrival at the referral hospital, the patient had no spontaneous movements, no motor response to pain, fixed and dilated pupils, and absent corneal, gag and cough reflexes. Spontaneous respiratory efforts were detected. There was a delay in the arrival of family members who were out of country at the time. After 24 hours of mechanical support, his neurological condition was unchanged.Given the severity of hypoxic ischaemic brain injury and the patient's dismal prognosis, the family was counselled to withdraw mechanical support. They requested organ donation but were informed that he was not eligible as he did not fulfil brain death criteria in view of the presence of spontaneous respiratory efforts. They agreed to withdrawal of support. The patient died 10 min after withdrawal of mechanical ventilation.The outcome after out-of-hospital cardiac arrest in children and adults is well known. Did the present child justify intensive care unit admission and why?Twenty-four hours after admission to the intensive care unit (ICU), the family of this teenager requested organ donation. When the patient has expressed a prior wish or families are motivated toward organ donation, is there an option to continue mechanical ventilation for 24–4
Magnetic Field Intensity/Melatonin-Molarity Interactions: Experimental Support with Planarian (Dugesia sp.) Activity for a Resonance-Like Process  [PDF]
Bryce P. Mulligan, Noa Gang, Glenn H. Parker, Michael A. Persinger
Open Journal of Biophysics (OJBIPHY) , 2012, DOI: 10.4236/ojbiphy.2012.24017
Abstract: Synergistic interactions between specific magnetic field intensities and chemical concentrations are challenging biophysical phenomena. Planarian were exposed to one of five different concentrations of melatonin and to a “geomagnetic”—patterned 7 Hz amplitude modulated magnetic field for 6 min once per hour for 8 hr during six successive nights. The peak average strengths were within the range (50 nT) or outside the range (200 nT) derived by the equation. As predicted by a resonance equation planarian displayed highly statistically significant decreased relative activity within the 50 nT, 10–7 to 10–6 M melatonin conditions compared to lower or higher concentrations. The effect explained about 30% of the variance in these changes of activity. Activity of planarian exposed to the same melatonin concentrations but to the 200 nT field did not differ significantly from each other or from those exposed to the 50 nT field in concentrations of melatonin <10–7 M or >10–6 M. These results suggest the existence of non-linear, “narrow-band” mechanisms involving the numbers of molecules within a distance determined by the boundary of the organism and the intensity of naturally-patterned magnetic fields derived from energy rather than force-based resonances.
A Dynamic Model of Information and Entropy
Michael C. Parker,Stuart D. Walker
Entropy , 2010, DOI: 10.3390/e12010080
Abstract: We discuss the possibility of a relativistic relationship between information and entropy, closely analogous to the classical Maxwell electro-magnetic wave equations. Inherent to the analysis is the description of information as residing in points of non-analyticity; yet ultimately also exhibiting a distributed characteristic: additionally analogous, therefore, to the wave-particle duality of light. At cosmological scales our vector differential equations predict conservation of information in black holes, whereas regular- and Z-DNA molecules correspond to helical solutions at microscopic levels. We further propose that regular- and Z-DNA are equivalent to the alternative words chosen from an alphabet to maintain the equilibrium of an information transmission system.
A Dynamic Theory of Information and Entropy
Michael C. Parker,Stuart D. Walker
Physics , 2004,
Abstract: We propose a new thermodynamic, relativistic relationship between information and entropy, which is closely analogous to the classic Maxwell electro-magnetic equations. Determination of whether information resides in points of non-analyticity or is more distributed in nature therefore relates directly to the well-known wave-particle duality of light. At cosmological scales our vector differential equations predict conservation of information in black holes, whereas regular and Z-DNA correspond to helical solutions at microscopic levels. We further propose that regular and Z-DNA are equivalent to the alternative words chosen from an alphabet to maintain the equilibrium of an information transmission system.
Method of Power Recycling in Co-Axial Mach Zender Interferometers for Low Noise Measurements
Stephen Parker,Eugene Ivanov,Michael Tobar
Physics , 2009,
Abstract: We present the first experimental study of a new type of power recycling microwave interferometer designed for low noise measurements. This system enhances sensitivity to phase fluctuations in a Device Under Test, independent of input power levels. The single sideband thermal white phase noise floor of the system has been lowered by 8 dB (reaching -185 dBc/Hz at 1 kHz offset frequency) at relatively low power levels (13 dBm).
Information Transfer and Landauer's Principle
Michael C. Parker,Stuart D. Walker
Physics , 2003, DOI: 10.1016/j.optcom.2003.10.019
Abstract: In this paper we present an analysis of information transfer based on Landauer's principle (i.e. erasure of information is associated with an increase in entropy), as well as considerations of analyticity and causality. We demonstrate that holomorphic functions allowing complete analytic continuation cannot propagate any information, such that information transfer only occurs with analytic functions having points of non-analyticity (i.e. meromorphic functions). Such points of non-analyticity (or discontinuities) are incompatible with adiabaticity, so that information transfer must always be accompanied by a change in entropy: a dynamic reformulation of Landauer's Principle. In addition, since Brillouin proved that discontinuities cannot travel faster than the speed of light c, this also implies that information cannot be transferred at superluminal speeds.
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