Resource Type

Two Component Signal Transduction in Desulfovibrio Species

The environmentally relevant Desulfovibrio species are sulfate-reducing bacteria that are of interest in the bioremediation of heavy metal contaminated water. Among these, the genome of D. vulgaris Hildenborough encodes a large number of two component systems consisting of 72 putative response regulators (RR) and 64 putative histidinekinases (HK), the majority of which are uncharacterized. We classified the D. vulgaris Hildenborough RRs based on their output domains and compared the distribution of RRs in other sequenced Desulfovibrio species. We have successfully purified most RRs and several HKs as His-tagged proteins. We performed phospho-transfer experiments to verify relationships between cognate pairs of HK and RR, and we have also mapped a few non-cognate HK-RR pairs. Presented here are our discoveries from the Desulfovibrio RR categorization and results from the in vitro studies using purified His tagged D. vulgaris HKs and RRs.
Date: May 17, 2010
Creator: Luning, Eric; Rajeev, Lara; Ray, Jayashree & Mukhopadhyay, Aindrila
System: The UNT Digital Library

Comparison of Predictive Models for PV Module Performance (Presentation)

This paper examines three models used to estimate the maximum power (P{sub m}) of PV modules when the irradiance and PV cell temperature are known: (1) the power temperature coefficient model, (2) the PVFORM model, and (3) the bilinear interpolation model. A variation of the power temperature coefficient model is also presented that improved model accuracy. For modeling values of P{sub m}, an 'effective' plane-of-array (POA) irradiance (E{sub e}) and the PV cell temperature (T) are used as model inputs. Using E{sub e} essentially removes the effects of variations in solar spectrum and reflectance losses, and permits the influence of irradiance and temperature on model performance for P{sub m} to be more easily studied. Eq. 1 is used to determine E{sub e} from T and the PV module's measured short-circuit current (I{sub sc}). Zero subscripts denote performance at Standard Reporting Conditions (SRC).
Date: May 1, 2008
Creator: Marion, B.
System: The UNT Digital Library

Biogeochemical Mechanisms Controlling Reduced Radionuclide Particle Properties and Stability

None
Date: April 19, 2007
Creator: Marshall, M.J.; Beliaev, A.S.; Fredrickson, J.K. & Zachara, J.M
System: The UNT Digital Library

Promoting Uranium Immobilization by the Activities of Microbial Phosphatases

The overall objective of this project is to examine the activity of nonspecific phosphohydrolases present in naturally occurring subsurface microorganisms for the purpose of promoting the immobilization of radionuclides through the production of uranium [U(VI)] phosphate precipitates. Specifically, we hypothesize that the precipitation of U(VI) phosphate minerals may be promoted through the microbial release and/or accumulation of PO4 3- as a means to detoxify radionuclides and heavy metals. An experimental approach was designed to determine the extent of phosphatase activity in bacteria previously isolated from contaminated subsurface soils collected at the ERSP Field Research Center (FRC) in Oak Ridge, TN. Screening of 135 metal resistant isolates for phosphatase activity indicated the majority (75 of 135) exhibited a phosphatase-positive phenotype. During this phase of the project, a PCR based approach has also been designed to assay FRC isolates for the presence of one or more classes of the characterized non-specific acid phophastase (NSAP) genes likely to be involved in promoting U(VI) precipitation. Testing of a subset of Pb resistant (Pbr) Arthrobacter, Bacillus and Rahnella strains indicated 4 of the 9 Pbr isolates exhibited phosphatase phenotypes suggestive of the ability to bioprecipitate U(VI). Two FRC strains, a Rahnella sp. strain Y9602 and …
Date: April 19, 2007
Creator: Martinez, Robert J.; Beazley, Melanie J.; Webb, Samuel M.; Taillefert, Martial & Sobecky, Patricia A.
System: The UNT Digital Library

Keeping their spirits up helps keep their weight down

None
Date: July 2015
Creator: Massachusetts WIC Nutrition Program
System: The Portal to Texas History

America calling : take your place in civilian defense.

Red and white text, with a civil defense insignia in the middle of the poster. Civil Defense insignia is a red "CD" in white triangle on a blue circle.
Date: 1941
Creator: Matter, Herbert, 1907-1984.
System: The UNT Digital Library

Coupled Processes Influencing the Transport of Uranium over Multiple Scales

None
Date: April 19, 2007
Creator: Mayes, Melanie A.; Tang, Guoping; Parker, Jack C.; Perfect, Ed & van den Berg, Elmer
System: The UNT Digital Library

The knockout blow starts here : fellow soldiers.

A series of black & white photographs showing the manufacture of war supplies, their use in the battlefield, and the appreciation of the armed forces for the factory workers. Includes a graphic image of a bomb hitting a swastika.
Date: 1942
Creator: McL, W.
System: The UNT Digital Library

"We'll lick 'em-- just give us the metal!"

A smiling soldier, with a bloody bandage on his right arm, holds a rifle with bayonet in one hand and a tattered Japanese flag in the other.
Date: 1943
Creator: McLeod, Ronald, 1897-1977.
System: The UNT Digital Library

"We'll lick 'em-- just give us the stuff!"

A smiling soldier, with a bloody bandage on his right arm, holds a rifle with bayonet in one hand and a tattered Japanese flag in the other.
Date: 1943
Creator: McLeod, Ronald, 1897-1977.
System: The UNT Digital Library

Millions of troops are on the move-- : is your trip necessary?

A large crowd of soldiers exit a train and crowd the train platform.
Date: 1943
Creator: Melbourne, Montgomery.
System: The UNT Digital Library

Syntrophic Degradation of Lactate in Methanogenic Co-cultures

In environments where the amount of the inorganic electron acceptors (oxygen, nitrate, sulfate, sulfur oroxidized metal ions (Fe3+;Mn4+) is insufficient for complete breakdown of organic matter, methane is formed as the major reduced end product. In such methanogenic environments organic acids are degraded by syntrophic associations of fermenting, acetogenic bacteria (e.g., sulfate-reducing bacteria (SRB) as"secondary fermenters") and methanogenic archaea. In these consortia, the conversion of lactate to acetate, CO2 and methane depends on the cooperating activities of both metabolically distinct microbial groups that are tightly linked by the need to maintain the exchanged metabolites (hydrogenandformate) at very low concentrations.
Date: May 17, 2010
Creator: Meyer, Birte & Stahl, David
System: The UNT Digital Library

I need you on the job full time-- don't get hurt.

Color poster shows a close-up view of a soldier in a combat helmet, pointing a military gun or rifle toward the viewer. An explosion can be seen in the background.
Date: 1943
Creator: Meyers, Harry Morse
System: The UNT Digital Library

Durability of Polymeric Encapsulation Materials for Concentrating Photovoltaic Systems [Poster]

Polymeric encapsulation materials are typically used in concentrating photovoltaic (CPV) modules to protect the cell from the field environment. Because it is physically located adjacent to the cell, the encapsulation is exposed to a high optical flux, often including light in the ultraviolet (UV) and infrared (IR) wavelengths. The durability of encapsulants used in CPV modules is critical to the technology, but is presently not well understood. This work seeks to identify the appropriate material types, field-induced failure mechanisms, and factors of influence (if possible) of polymeric encapsulation. These results will ultimately be weighed against those of future qualification and accelerated life test procedures.
Date: February 1, 2011
Creator: Miller, D. C.; Kempe, M. D.; Araki, K.; Kennedy, C. E. & Kurtz, S. R.
System: The UNT Digital Library

Feed a fighter : eat only what you need-- waste nothing-- that he and his family may have enough.

Charcoal drawing of a soldier sitting in a trench, drinking out of a cup. Other soldiers can be seen in the background. At the top right corner of the poster is the round seal of the U.S. Food Administration (shield with flag motif surrounded by wheat stalks).
Date: 1918
Creator: Morgan, Wallace.
System: The UNT Digital Library

Your victory garden counts more than ever!

In the background is a view of a garden with a man and woman cultivating and weeding; foreground is an arrangement of various vegetables, including peas in the shell, cabbage, and carrots.
Date: 1945
Creator: Morley, Hubert.
System: The UNT Digital Library

For their future-- : buy war bonds.

Painting of a blonde woman in a blue shirt and red and white striped skirt, holding a blonde baby. There is a blue sky behind them with some clouds. They are both looking down at a black toy lamb, with a flower wreath around its head. The poster is bordered by a painted picture frame. "BUY WAR BONDS" is in what would be a metal plate fastened to the "frame"
Date: 1943
Creator: Munsell
System: The UNT Digital Library

Take the wheel : --steer a course for future success while serving your country in the United States Navy or the U.S. Naval Reserve.

The upper half of the poster shows a painting of a large U.S. battleship, with additional ships seen in the background. In the lower half of the poster, to the left of the poster caption, is a small image of a naval officer looking through a porthole with binoculars and a sailor in a white uniform steering the ship.
Date: 1941
Creator: Murphey, Matt.
System: The UNT Digital Library

"Deliver us from evil" : buy war bonds.

Black & white photo of the head and shoulders of a sad-looking young girl surrounded by smoke or clouds. The photo is centered on a white swastika. Text on poster is in white and blue.
Date: 1943
Creator: Nadeau, Harriet
System: The UNT Digital Library

Making America strong : competitive companies co-operate to produce important instruments for military aircraft.

Black & white poster features comic-book style drawings of an industrial worker, managers, and buildings, and a large outline map of the U.S. containing additional text.
Date: 1942?
Creator: National Association of Manufacturers (U.S.)
System: The UNT Digital Library

Making America strong : how American shipyards are winning the race against time to build our Navy.

Black & white chart describes how shipbuilding has become quicker during wartime. It features comic-book style drawings of a shipyard, a large ship at sea, and Uncle Sam changing from his decorated top hat to a worker's cap.
Date: 1942?
Creator: National Association of Manufacturers (U.S.)
System: The UNT Digital Library

Making America strong : how subcontracting accelerates defense production--.

Black & white poster features comic-book style drawings. In the center of a large outline map of United States is a large tank, with numerous lines pointing outward to small drawings of industrial buildings throughout the U.S. In the upper left corner is a more detailed drawing of a factory with smokestacks.
Date: 1942?
Creator: National Association of Manufacturers (U.S.)
System: The UNT Digital Library

Making America strong : industry's ever improving mass production methods step up output of latest type war planes.

Black & white poster features comic-book style drawings of machinery used to produce airplanes. In the upper right corner is an image of Uncle Sam pointing out to some people a flying military airplane which is seen through a large "hole" drawn in the poster.
Date: 1942?
Creator: National Association of Manufacturers (U.S.)
System: The UNT Digital Library