24,663 research outputs found
Raman Chemical Imaging of Chromate Reduction Sites in a Single Bacterium Using Intracellularly Grown Gold Nanoislands
No full textImaging live molecular events within micro-organisms at single-cell resolution would deliver valuable mechanistic information much needed in understanding key biological processes. We present a surface-enhanced Raman (SERS) chemical imaging strategy as a first step toward exploring the intracellular bioreduction pockets of toxic chromate in Shewanella. In order to achieve this, we take advantage of an innate reductive mechanism in bacteria of reducing gold ions Into intracellular gold nanoislands, which provide the necessary enhancement for SERS imaging. We show that SERS has the sensitivity and selectivity not only to identify but also to differentiate between the two stable valence forms of chromate in cells. The imaging platform was used to understand intracellular metal reduction activities In a ubiquitous metal-reducing organism, Shewanella oneidensis MR-1, by mapping chromate reduction
Michael N. Gold
No full textMike Gold is Bigelow Aerospace’s Director of D.C. Operations & Business Growth. Mr. Gold is responsible for a broad array of activities at Bigelow Aerospace including international business development, legal issues, Congressional affairs, and strategic planning.
In 2008, Mr. Gold was appointed by the U.S. Secretary of Transportation to serve on the Commercial Space Transportation Advisory Committee (“COMSTAC”), and was appointed to serve as Chair of the organization in 2012. The COMSTAC is a federal advisory committee comprised of leading commercial space industry executives that provides advice to the FAA Office of Commercial Space Transportation. Additionally, Mr. Gold was appointed by the National Research Council to serve on the Space Technology Industry-Government-University roundtable which provides direction and advice to NASA’s Space Technology Mission Directorate.
Mr. Gold has written three law review articles describing the intersection between the commercial space industry and export controls, has had two editorials entered into the Congressional Record, and testified before the U.S. Senate Commerce Committee to address issues related to commercial space development.https://commons.erau.edu/stm-images/1056/thumbnail.jp
_In vivo_ photoacoustic molecular imaging with simultaneous multiple selective targeting using antibody-conjugated gold nanorods
No full textThe use of gold nanorods for photoacoustic molecular imaging in vivo with simultaneous multiple selective targeting is reported. The extravasation of multiple molecular probes is demonstrated, and used to probe molecular information of cancer cells. This technique allows molecular profiles representing tumor characteristics to be obtained and a heterogeneous population of cancer cells in a lesion to be determined. The results also show that the image contrast can be enhanced by using a mixture of different molecular probes. In this study, HER2, EGFR, and CXCR4 were chosen as the primary target molecules for examining two types of cancer cells, OECM1 and Cal27. OECM1 cells overexpressed HER2 but exhibited a low expression of EGFR, while Cal27 cells showed the opposite expression profile. Single and double targeting resulted in signal enhancements of up to 3 dB and up to 5 dB, respectively, and hence has potential in improving cancer diagnoses
Cannibals were most interested in the gramaphone and said that there must be a "master stop along bokis", Bulolo, Papua New Guinea, ca. 1933 [picture] /
No full text"Cannibals were most interested in the gramaphone and said that there must be a "master stop along bokis"."--Handwritten on verso.; Condition: Some fading.; Also available in an electronic version via the Internet at: http://nla.gov.au/nla.pic-an24523818. Photograph taken by Mr. Sturkey, civil engineeer, when involved with the building of a gold dredge at Bulolo, Papua New Guinea, ca. 1933
Kanakas watching and listening to the gramaphone, Bulolo, Papua New Guinea, ca. 1933 [picture] /
No full text"Kanakas watching and listening to the gramaphone."--Handwritten on verso.; Condition: Some fading.; Also available in an electronic version via the Internet at: http://nla.gov.au/nla.pic-an24412584. Photograph taken by Mr. Sturkey, civil engineeer, when involved with the building of a gold dredge at Bulolo, Papua New Guinea, ca. 1933
Mr. Melvin J. Collier, RWWL AUC, June 2011
No full textThis video is a conversation with Mr. Melvin J. Collier. Mr. Collier talks about his book, "From Mississippi to Africa: A Journey of Discovery". Daniel Le, AUC Woodruff Library, is the interviewer
A Cross-Sectional Survey on Knowledge and Perceptions of Health Risks Associated with Arsenic and Mercury Contamination from Artisanal Gold mining in Tanzania.
No full textAn estimated 0.5 to 1.5 million informal miners, of whom 30-50% are women, rely on artisanal mining for their livelihood in Tanzania. Mercury, used in the processing gold ore, and arsenic, which is a constituent of some ores, are common occupational exposures that frequently result in widespread environmental contamination. Frequently, the mining activities are conducted haphazardly without regard for environmental, occupational, or community exposure. The primary objective of this study was to assess community risk knowledge and perception of potential mercury and arsenic toxicity and/or exposure from artisanal gold mining in Rwamagasa in northwestern Tanzania. A cross-sectional survey of respondents in five sub-villages in the Rwamagasa Village located in Geita District in northwestern Tanzania near Lake Victoria was conducted. This area has a history of artisanal gold mining and many of the population continue to work as miners. Using a clustered random selection approach for recruitment, a total of 160 individuals over 18 years of age completed a structured interview. The interviews revealed wide variations in knowledge and risk perceptions concerning mercury and arsenic exposure, with 40.6% (n=65) and 89.4% (n=143) not aware of the health effects of mercury and arsenic exposure respectively. Males were significantly more knowledgeable (n=59, 36.9%) than females (n=36, 22.5%) with regard to mercury (x²=3.99, p<0.05). An individual's occupation category was associated with level of knowledge (x²=22.82, p=<0.001). Individuals involved in mining (n=63, 73.2%) were more knowledgeable about the negative health effects of mercury than individuals in other occupations. Of the few individuals (n=17, 10.6%) who knew about arsenic toxicity, the majority (n=10, 58.8%) were miners. The knowledge of individuals living in Rwamagasa, Tanzania, an area with a history of artisanal gold mining, varied widely with regard to the health hazards of mercury and arsenic. In these communities there was limited awareness of the threats to health associated with exposure to mercury and arsenic. This lack of knowledge, combined with minimal environmental monitoring and controlled waste management practices, highlights the need for health education, surveillance, and policy changes
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[Mike Rutherford and Mr. Gold Bar]
No full textPhotograph of a horse named, Mr. Gold Bar, being led by Mike Rutherford
Interview Excerpt of Mr. Donald M. Crawford, Sr.
No full text(1948-2018) Donald Mitchell Crawford, Sr. (“DC”), musician, author, and educator, was born on May 24, 1948, and was a lifelong resident of Birmingham, AL. His father and mother owned and operated “C & S Charter Tours Bus Company,” the first black-owned bus company in the state of Alabama. Crawford was a 1966 graduate of Western Olin High School in Birmingham, AL. Crawford was an outstanding drum major, playing first chair alto saxophone under the tutelage of the late Amos F. Gordon, Sr. After high school, he received a music scholarship to Alabama State University (ASU) where he earned both his Bachelor’s and Master’s Degrees in Music Education and was later inducted into the “School of Music Hall of Fame” at ASU. He was the youngest ever inducted into the Alabama Jazz Hall of Fame. He was a veteran of the U.S. Army and performed with the 291 st and 283rd Army Band in Fort Bennett, GA. DC was Band Director at Jackson Olin High School and taught in the Birmingham School System for over thirty-five years. His love for music and performing lead him after his retirement to serve as Band Director for Miles College.
Crawford is the author of “The Wheels of the Birmingham Civil Rights Movement.” This book chronicles the lives of his late father and mother, Worcy and Christine Pride Crawford, and the role he and the company played in the Birmingham Civil Rights Movement
The Impact of Safety Climate on Safety Performance in a Gold Mining Company in Ghana
No full textThe study investigated the influence of safety climate on safety performance among employees in a multi-national gold mining company in Ghana. Safety climate was conceptualized and measured in terms of employee perceptions of management value for safety, supervisor safety practices, safety communication, safety training and safety system. Safety performance was conceptualized and measured in terms of employee safety compliance and safety participation, that is, how they make suggestions to improve safety in the mining environment. Using a cross-sectional survey design, 235 workers in the mines completed questionnaires on safety climate and safety performance. Pearson correlations and multiple regression analysis of the data indicated positive relationship between safety climate and safety performance as predicted. Safety systems predicted both safety compliance and participation. Safety communication and supervisory practices predicted safety compliance and safety participation respectively. The results are discussed in the framework of the theories of reasoned action and planned behaviour
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