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    7027 research outputs found

    The impact of the internet on the doctor-patient relationship

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    This thesis explored the impact of the use of online health information on the doctor-patient relationship. In the existing literature, some aspects of online health information have been studies extensively, such as who is searching for information, what searching strategies are being utilized, and what topics are being looked up. Even the advantages and disadvantages have been examined in various articles. However, there is little to no literature that analyzes the effect of online health information on the doctor-patient relationship. In an attempt to investigate this, patients and physicians were interviewed on the doctor-patient relationship. This thesis found that both of the interviewed patients seemed to turn to the Internet after the relationship with their doctor began to deteriorate. However, it was also found that online health information seems to make appointment times more inefficient because of the additional time required to clarify the misleading inaccurate information that patients are reading on the Internet. Thus, in order to most effectively harness the power of this new tool in the United States, various changes, such as medical school curriculums and expansion of government programs, need to be implemented

    Effects of gravidity on jump performance in the American Locust (Schistocerca americana)

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    Life history changes can alter energetic demands associated with locomotion. In American locusts (Schistocerca americana), oviposition causes body mass fluctuations of approximately 20% in female locusts that may occur as often as every five days. In this study, I examine how gravidity affects jump performance in American locusts (Schistocerca americana). Endurance tests compared the repeated jump performance of 17 locusts over a ten minute trial when “non-gravid” (body mass decrease of greater than 15% from the previous day) and “gravid” (body mass increase of 15% from the non-gravid day). Average jump frequency, average jump distance, and average jump energy were generally similar at each minute for gravid and non-gravid locusts. Average jump frequency gradually decreased over the ten minutes, while average jump distance and average jump energy remained relatively constant. Maximal jump distances were significantly different between gravid and non-gravid, indicating that as body mass increased, maximal jump distance decreased. Maximal jump energy remained the same between gravid and non-gravid values. These findings indicate no negative effects of gravidity on endurance, but may suggest a trade-off between maximal jump performance and fecundity

    Photoproduction of neutral mesons from hydrogen and helium targets in CLAS

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    The photoproduction of p0 and h mesons from hydrogen and 3He targets over an incident photon energy range of 0.5 - 1.5 GeV was studied using data from the CEBAF Large Acceptance Spectrometer (CLAS) at Jefferson Lab. This was part of a systematic study of meson photoproduction from the proton and light nuclear targets to investigate possible nuclear medium modifications of nucleon resonances and meson-nucleon interactions. A preliminary analysis of h cross sections was done using missing mass analysis and the results were compared to known data. Several corrections were then done to account for momentum loss of charged particles, as well as to determine fiducial volumes for charged particles and photons. The final analysis involved reconstructing the neutral mesons from their two-photon decay. Two-photon invariant mass spectra binned in incident photon energy and production angle were fitted to extract yields for p0 and h meson photoproduction. Monte Carlo simulations were also performed to determine the acceptance of the CLAS detector for these reactions. The analysis will be described and the procedures used to extract the yields and determine the acceptance will be discussed. Finally, preliminary cross section results will be presented. We saw an unexpected bump in the cross sections for the p0 at around 50 to 60 degrees. Further study is needed in order to determine whether this bump is due to an unknown phenomenon or an error in our analysis

    Cloning and expression of Scp1 : a yeast metacaspase homolog, from Schizophyllym Commune

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    Microfluidic shear stress measurement : liquid crystal technique

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    Preliminary work towards developing a liquid crystal based technique for direct shear stress measurements over fluid / solid surfaces in microfluidic systems is presented. The particular previous work in microfluidics which motivated the development of this technique is presented, as is general background on microfluidics. The theory of shear sensitive liquid crystals is reviewed and then expanded upon in regards to the specific type of flow considered in this study; slug flow. Slug flow is a regime of two phase flow which can occur when two immiscible fluids are pushed through the same microchannel. Under the correct conditions the two fluids will separate into well defined alternating slugs which span the entire channel. The shear stress field near the interface between the fluids is not currently well understood, which is the problem that provides the motivation for this study. A prototype apparatus is described which is capable of generating slugs, and has appropriate optical access to test the liquid crystal shear stress measurement technique. The microchannel (150um x 250um laser etched glass), auxiliary flow (Cole-Parmer Infusion 100 Syringe Pump), and optical data collection (Olympus BX51 microscope) subsystems are all described in detail. Procedures for applying the cholesteric liquid crystal mixtures obtained through Pressure Chemicals Ltd. to the microchannel and for collecting liquid crystal data are described as well. Finally, preliminary results are presented, the current status of the technique is stated along with proposed directions for future research work

    Calibrating recent sedimentary sequences from the proximal basin of a large glacially fed lake with hydroclimate data, Kenai Peninsula, Alaska.

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    Understanding how today’s climate affects certain processes on Earth allows scientists to construct paleoclimate conditions in an ongoing attempt to comprehend how our Earth is changing. By examining climate proxies, or indirect indicators of climate, and calibrating them to instrument data, it is possible to gain a better understanding of how climatic conditions control the climate proxy. With this knowledge, longer records, which continue back into the past further than instrument data, can be examined and climatic conditions determined. Glaciolacustrine sediments hold excellent proxy climate records. The thickness and pattern of these records can be calibrated to instrument data to provide a reliable, high resolution climate record. For this project, sediment from a lake in south-central Alaska, Skilak Lake, were taken and analyzed. An attempt was made to calibrate these laminated sediments to instrument data. The sediment was laminated. The sediment records from LI3 and LI4 were fairly consistent with each other in terms of the patterns of lamina thickness as did the records from Prox 8 and Prox 12. When compared to the climate data obtained from Kenai Municipal Airport, the sediment layer thickness correlated poorly with both the mean July and August and the mean July temperature. This either suggests that the mean temperature is not the main control on the thickness of the lamina or that the lamina are not annual varves, but contain sub-annual events. While a reliable climate proxy was not created in this project, one surely exists in the sediment. Taking a closer look at the potential causes of sub-annual layers or other factors that could control lamina thickness, like summer and winter precipitation, would certainly provide a more clear interpretation of the laminations present at Skilak

    The changing concept of the Roman Imperium from Late Antiquity to the Middle Ages

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    The paper examines the changing concept of the Roman Imperium from the time of the emperor Theodosius in the late fourth century to the German writer Alexander von Roes in the thirteenth century. The purpose is to determine at what point the concept of the Imperium no longer resembled that of the Roman world. Some especially important periods are addressed: Justinian’s reconquests, the rise of the Frankish monarch to the imperial title under Charlemagne, the division of the Carolingian Empire under Louis the Pious, the ascension of Otto I and the German kings to imperial office, the decline of Imperial influence following the death of Otto III, and the Interregnum of the thirteenth century. Some general sources establish the basic progression of the Imperium, including Ostrogorsky’s History of the Byzantine State, Folz’s The Coronation of Charlemagne, and Barraclough’s The Origins of Modern Germany. For primary sources I used Justinian’s Digesta, Justinian’s Institutes, the Chronicon of Theitmar of Marseburg, and the Memoriale de Prerogativa Imperii Romani of Alexander von Roes. The sources justify the identification of possession of both temporal and religious power as the defining concept of the Imperium. The first chapter establishes the characteristics of the Roman Imperium in the context of Late Antiquity beginning with Theodosius, the last emperor to rule over a completely unified Roman Empire, and ending with the attempts by Justinian to reestablish this rule over the Western provinces. Chapter two addresses the revival of the Western imperial throne under Charlemagne in 800 and under the German kings in 963. Chapter three outlines the decline of German imperial power from the death of Otto III in 1002 to the Interregnum between 1250 and 1272. Chapter four examines the Memoriale de Perogativa Imperii Romani of Alexander von Roes in detail to understand the differences between his concept of Imperium and that of Late Antiquity. Challenges to the temporal and religious influence of the Imperium resulted in limitations on imperial power. These limitations were then followed by the removal of the theoretical powers which had defined the Roman Imperium as a universal power in Antiquity. The most significant challenges came with the division of the Carolingian Empire, the death of Otto III in 1002, and the Investiture Contest in the late eleventh and early twelfth centuries. The territorial divisions severely limited the political influence of the imperial crown and the Investiture Contest stripped away the last vestiges of the Imperium’s power over the clergy

    Terraforming Mars

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    Determination of loading on bird feather shafts

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