Search Results

Obligately Thermophilic Nitrogen-Fixation in Some Soil Bacteria

Description: In the work presented here, it is claimed that bacteria have been isolated which are capable of growth at high temperatures utilizing molecular nitrogen as their sole nitrogen source. Soil bacteria were isolated which grew at 55 C in nitrogen-free media. They were found to be obligatory thermophiles in nitrogen-free media and facultative thermophiles in media containing organically bound nitrogen.
Date: August 1971
Creator: Milam, Mary
Partner: UNT Libraries

Kinetic Investigation of the Gas Phase Atomic Sulfur and Nitrogen Dioxide Reaction

Description: The kinetics of the reaction of atomic sulfur and nitrogen dioxide have been investigated over the temperature range 298 to 650 K and pressures from 14 - 405 mbar using the laser flash photolysis - resonance fluorescence technique. The overall bimolecular rate expression k (T) = (1.88 ± 0.49) x10-11 exp-(4.14 ± 0.10 kJ mol-1)/RT cm3 molecule-1 s-1 is derived. Ab initio calculations were performed at the CCSD(T)/CBS level of theory and a potential energy surface has been derived. RRKM theory calculations were performed on the system. It is found that an initially formed SNO2 is vibrationally excited and the rate of collisional stabilization is slower than the rate of dissociation to SO + NO products by a factor of 100 - 1000, under the experimental conditions.
Date: May 2011
Creator: Thompson, Kristopher Michael
Partner: UNT Libraries

Composting technologies, costs, programs, and markets

Description: This report provides an overview of the technology of composting which involves three major steps: 1) the preparation of the raw material, 2) the compost process itself, and 3) the grading of the final product.
Date: January 1989
Creator: CAL Recovery Systems, Inc.
Item Type: Report
Partner: UNT Libraries Government Documents Department

Cobalt-Dinitrogen Complexes with Weakened N-N Bonds

Description: Article discussing research on cobalt-dinitrogen complexes with weakened N-N bonds.
Date: June 19, 2009
Creator: Ding, Keying; Pierpont, Aaron W.; Brennessel, William W.; Lukat-Rodgers, Gudrun; Rodgers, Kenton R.; Cundari, Thomas R., 1964- et al.
Item Type: Article
Partner: UNT College of Arts and Sciences

Integrated Assessment of Hypoxia in the Northern Gulf of Mexico

Description: This document details the ecological and economic effects of low oxygen (hypoxic) conditions in the Gulf of Mexico. This condition is caused by deforestation, river channelization, and the overuse of nitrogen in agricultural fertilizer. This document summarizes scientific evidence for the causes of hypoxia, the negative impact on Gulf of Mexico fisheries, and long-term national strategies for managing and mitigating the problem.
Date: May 2000
Creator: National Science and Technology Council (U.S.). Committee on Environment and Natural Resources.
Item Type: Text
Partner: UNT Libraries

An Assessment of Coastal Hypoxia and Eutrophication in U.S. Waters

Description: This document is about hypoxia in aquatic ecosystems. Hypoxia is a depletion of oxygen caused by runoff, land cover change, and other factors associated with population growth and agriculture. The report discusses mitigation strategies and trends in managing this problem.
Date: November 2003
Creator: National Science and Technology Council (U.S.). Air Quality Research Subcommittee.
Item Type: Text
Partner: UNT Libraries

Clearing the Waters: A focus on water quality solutions

Description: This report discusses global water issues and offers a variety of proposals for countering the degradation of freshwater ecosystems for the benefit of public health and the environment.
Date: March 2010
Creator: Palanaippan, Meena; Gleick, Peter H.; Allen, Lucy; Cohen, Michael J.; Christian-Smith, Juliet; Smith, Courtney et al.
Item Type: Text
Partner: UNT Libraries

A Review of the Utilization of Fission Fragment Energy for the Fixation of Nitrogen

Description: Report issued by the Brookhaven National Laboratory discussing methods of nitrogen fixation, and their economic impacts. As stated in the introduction, "studies are described on circulating dust fuels, as well as fixed plated, porous bed, and other types of fuels as the basis for chemo-nuclear reactor designs, and the various fuel systems are compared on a technical and economic basis" (p. 3). This report includes tables, and illustrations.
Date: January 17, 1961
Creator: Steinberg, Meyer; Powell, J. R. & Green, Leon
Item Type: Report
Partner: UNT Libraries Government Documents Department

Plasmids of Azotobacter vinelandii

Description: Article on the plasmids of Azotobacter vinelandii.
Date: April 1988
Creator: Maia, Mauricio; Sanchez, Juan M. & Vela, G. Roland, 1927-
Item Type: Article
Partner: UNT College of Arts and Sciences

The Reactivity Patterns of Low-Coordinate Iron-Hydride Complexes

Description: This article discusses the reactivity patterns of low-coordinate iron-hydride complexes. The authors report a survey of the reactivity of the first isolable iron-hydride complexes with a coordiination number less than 5.
Date: April 30, 2008
Creator: Yu, Ying; Sadique, Azwana R.; Smith, Jeremy M.; Dugan, Thomas R.; Cowley, Ryan E.; Brennessel, William W. et al.
Item Type: Article
Partner: UNT College of Arts and Sciences

Making a Difference

Description: Lesson plan containing a collection of activities and resources regarding making a difference and that meet state education standards and national sustainability standards for the 4th grade level.
Date: August 29, 2014
Creator: Parsons, John
Item Type: Text
Partner: UNT Office of Sustainability

Mechanisms of Cyanide Assimilation in Pseudomonas fluorescens NCIMB 11764

Description: Pseudomonas fluorescens NCIMB 11764 was capable of utilizing cyanide as a sole nitrogen source for growth. Cyanate (OCN") and S-cyanoalanine could also serve as nitrogenous substrates, but do not appear to play a role as intermediates in cyanide metabolism. Growth of this strain on cyanate as the sole nitrogen source led to the induction of an enzyme characterized as a cyanase (EC 3.5.5.3) based on its stoichiometric conversion of cyanate to ammonia, and dependence on bicarbonate for maximal activity. However, since cyanase activity was not elevated in cyanide-grown cells it was concluded that it serves no role in cyanide metabolism. Related studies aimed at examining a possible role for S-cyanoalanine as a cyanide-assimilation intermediate showed that while this compound also serves as a nitrogen source, it also is not important in cyanide metabolism. Studies focused on the utilization of free cyanide as a growth substrate led to the development of a fed-batch cultivation procedure greatly facilitating further experimentation aimed at the identification of cyanide metabolites. In addition to CO_2 and NH_3 as described earlier, two additional metabolites including formamide and formate were detected by using nC-NMR, HPLC, radioisotrapping methods and other analytical means. The formation of metabolites was shown to be induced after growth on cyanide with the relative product yields dependent on the availability of oxygen. These findings support earlier work in which an oxygen-dependent mechanism was proposed for the formation of C02 and NH3. However, at least two additional oxygen-independent pathways of cyanide conversion can be elaborated by this organism. One of these involves conversion to formate and ammonia while the other leads to the formation of formamide, which is not further degraded. Thus, growth on cyanide appears to occur by several mechanisms of chemical transformation presumably serving both detoxification and nutritional roles. Since two of these mechanisms ...
Date: August 1992
Creator: Nagappan, Olagappan
Partner: UNT Libraries

Barnyard manure.

Description: Describes the benefits of more economical management of organic farm resources, namely barnyard manure. Discusses the management and application of methods for using fertilizers on the farm.
Date: May 10, 1906
Creator: United States. Dept. of Agriculture.
Item Type: Book
Partner: UNT Libraries Government Documents Department

Nitrogen-fixing bacteria and legumes.

Description: Describes the importance of nitrogen-fixing bacteria on crops of legumes.
Date: December 1937
Creator: Leonard, Lewis T. (Lewis Thompson), 1885-
Item Type: Book
Partner: UNT Libraries Government Documents Department