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Challenges of Pathogen Control in Beef Cattle Production and Processing in South TexasHaneklaus, Ashley N 02 October 2013 (has links)
This multi-phase project was designed (1) to evaluate existing post-harvest process controls and intervention strategies used to reduce Escherichia coli O157:H7, (2) to evaluate the impacts of cattle source and environmental factors on Salmonella prevalence in bovine lymph nodes, and (3) to evaluate sanitary conditions of feedyards in South Texas. The ultimate goal of this project was to identify and implement measures that reduce E. coli O157:H7 in beef harvest facilities, and Salmonella prevalence in feedyards. To evaluate process control of E. coli O157:H7 throughout the beef harvest process, samples were collected from harvest floor processing areas at two commercial beef slaughter establishments, and enumerated for aerobic plate counts, E. coli/coliform, and Enterobacteriaceae. To survey existing Salmonella prevalence, bovine lymph nodes (n = 307) were collected from beef carcasses at a commercial beef processing plant. Lymph nodes were extracted from cattle sourced from seven feedyards. Salmonella prevalence in lymph nodes was found to be 0% in cattle sourced from only one of the seven yards. Lymph nodes from cattle sourced from the other feedyards yielded positive samples, with varying prevalence. Of the remaining six feedyards, one feedyard yielded 88.2% prevalence of Salmonella in bovine lymph nodes, which was significantly higher than all other feedyards (42.9, 40.0, 40.0, 24.0, and 4.0%). The prevalence of Salmonella in the feedlot environment was compared among three feedyards; one yard had 65.0% environmental prevalence of Salmonella, which was statistically higher than the other feedyards surveyed. Of the two remaining yards, one had 0% prevalence of Salmonella in fecal and soil samples, which was also the feedyard with 0% prevalence of Salmonella in lymph nodes. Findings include (1) the significance of effective sanitary dressing procedures and intervention strategies in a beef harvest environment, (2) that there is clear feedyard-to-feedyard variation with relation to Salmonella prevalence in bovine lymph nodes, and (3) that differences in environmental factors existed among feedyards although the reasons remain unclear.
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Studies on prediction of axillary lymph node status in invasive breast cancer /Ahlgren, Johan, January 2002 (has links)
Diss. (sammanfattning) Uppsala : Univ., 2002. / Härtill 5 uppsatser.
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Predictors of axillary lymph node involvement in screen-detected breast cancer /Chen, Wanqing. January 2004 (has links)
Thesis (M.I.P.H.)--School of Public Health, University of Sydney, 2004. / "This treatise is submitted in partial satisfaction of the requirements for the Degree of Master of International Public Health (Hons), University of Sydney". Bibliography: leaves 10-15.
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Predictors of axillary lymph node involvement in screen-detected breast cancerChen, Wanqing. January 2004 (has links)
Thesis (M.I.P.H.)--University of Sydney, 2004. / Title from title screen (viewed 14 May 2008). Submitted in fulfilment of the requirements for the degree of Master of International Public Health (Hons) to the School of Public Health. Includes bibliographical references. Also available in print form.
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Experience using a small field of view gamma camera for intraoperative sentinel lymph node proceduresGreene, Carmen M. January 2006 (has links)
Thesis (M. S.)--Mechanical Engineering, Georgia Institute of Technology, 2006. / Nolan Hertel, Committee Chair ; John Aarsvold, Committee Co-Chair ; Rebecca Howell, Committee Member.
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Protease activity in lymphoid organs of BALB/C and C57BL/6 mice following murine leukemia virus /Nardiello, Tricia Lynn. January 2007 (has links) (PDF)
Undergraduate honors paper--Mount Holyoke College, 2007. Dept. of Biological Sciences. / Includes bibliographical references (leaves 69-70).
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Effectiveness of prophylactic retropharyngeal lymph node irradiation in patients with locally advanced head and neck cancerNguyen, Nam, Vock, Jacqueline, Vinh-Hung, Vincent, Almeida, Fabio, Ewell, Lars, Betz, Michael, Jang, Siyoung, Vo, Richard, Dutta, Suresh, Godinez, Juan, Karlsson, Ulf, Chi, Alexander January 2012 (has links)
BACKGROUND:The aim of the study is to assess the effectiveness of intensity-modulated radiotherapy (IMRT) or image-guided radiotherapy (IGRT) for the prevention of retropharyngeal nodal recurrences in locally advanced head and neck cancer.METHODS:A retrospective review of 76 patients with head and neck cancer undergoing concurrent chemoradiation or postoperative radiotherapy with IMRT or IGRT who were at risk for retropharyngeal nodal recurrences because of anatomic site (hypopharynx, nasopharynx, oropharynx) and/or the presence of nodal metastases was undertaken.The prevalence of retropharyngeal nodal recurrences was assessed on follow-up positron emission tomography (PET)-CT scans.RESULTS:At a median follow-up of 22months (4-53months), no patient developed retropharyngeal nodal recurrences.CONCLUSION:Prophylactic irradiation of retropharyngeal lymph nodes with IMRT or IGRT provides effective regional control for individuals at risk for recurrence in these nodes.
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Graph-based segmentation of lymph nodes in CT dataWang, Yao 01 December 2010 (has links)
The quantitative assessment of lymph node size plays an important role in treatment of diseases like cancer. In current clinical practice, lymph nodes are analyzed manually based on very rough measures of long and/or short axis length, which is error prone. In this paper we present a graph-based lymph node segmentation method to enable the computer-aided three-dimensional (3D) assessment of lymph node size. Our method has been validated on 111 cases of enlarged lymph nodes imaged with X-ray computed tomography (CT). For unsigned surface positioning error, Hausdorff distance and Dice coefficient, the mean was around 0.5 mm, under 3.26 mm and above 0.77 respectively. On average, 5.3 seconds were required by our algorithm for the segmentation of a lymph node.
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New Hypothesis on the Origin of MetastasesSCHISCHMANOV, NICOLA 02 1900 (has links)
No description available.
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Experience using a small field of view gamma camera for intraoperative sentinel lymph node proceduresGreene, Carmen M. 18 January 2006 (has links)
Staging is critical in the management of cancer. Sentinel lymph node (SLN) biopsy is one method used in the assessment of cancer spread. SLN procedures are standard practice in the management of some cancers although; these procedures have only recently been developed and refined. SLN procedures are commonly used in the management of melanomas and breast cancers in patients with no evidence of metastatic disease on clinical exam.
SLN procedures include detection, localization, and assessment of SLNs. The detection/localization components vary in technique and rates of success. The procedures with the least number of detection/localization techniques generally include the use of blue dye or the use of a radiotracer with intraoperative gamma counting. The most complex procedures involve the use of blue dye, the use of a radiotracer with preoperative gamma imaging and preoperative gamma counting, intraoperative gamma counting, or some combination of these techniques.
The ideal procedure for SLN would include all the listed techniques however; all facilities do not incorporate the most complete procedure, for different reasons. An investigation using a small FOV (5 in x 5 in) gamma camera intraoperatively for SLN procedures in melanoma and breast cancer patients was performed. A smaller FOV camera is capable of obtaining some of the same information as a conventional gamma camera. It is possible that centers, which do not or are not able to take advantage of preoperative imaging, may find the use of a smaller FOV gamma camera in the operating room useful.
The investigation consisted of a total of 41 patients; it was split into two studies, Study 1: melanoma and study 2: breast cancer. The melanoma study found the added use of a smaller FOV camera under the parameters of this study to be minimal. Study 2 was broken into two branches; branch 1: camera/probe/dye and branch 2: probe/dye, for a comparison study. Comparing the two branches did not show the smaller FOV camera to reduce the time spent in the operating room versus using the probe and blue dye.
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