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Sequence dependent structure and thermodynamics of DNA oligonucleotides and polynucleotides: uv melting and NMR (nuclear magnetic resonance) studies
Thermodynamic parameters for double strand formation have been measured for the twenty-five DNA double helices made by mixing deoxyoligonucleotides of the sequence dCA/sub 3/XA/sub 3/G with the complement dCT/sub 3/YT/sub 3/G. Each of the bases A, C, G, T, and I (I = hypoxanthine) have been substituted at the positions labeled X and Y. The results are analyzed in terms of nearest neighbors. At higher temperatures the sequences containing a G)centerreverse arrowdot)C base pair become more stable than those containing only A)centerreverse arrowdot)T. All molecules containing mismatcher are destabilized with respect to those with only Watson-Crick pairing, but there is a wide range of destabilization. Large neighboring base effects upon stability were observed. For example, when (X, Y) = (I, A), the duplex is eightfold more stable than when (X, Y) = (A, I). Independent of sequence effects the order of stabilities is: I)centerreverse arrowdot)C )succ) I)centerreverse arrowdot) A)succ) I)centerreverse arrowdot)T approx. I)centerreverse arrowdot)G. All of these results are discussed within the context of models for sequence dependent DNA secondary structure, replication fidelity and mechanisms of mismatch repair, and implications for probe design. The duplex deoxyoligonucleotide d(GGATGGGAG))centerreverse arrowdot)d(CTCCCATCC) is a portion of the gene recognition sequence of the protein transcription …
Date:
December 1, 1987
Creator:
Aboul-ela, F. M.
Object Type:
Report
System:
The UNT Digital Library
The development of a selective ruthenium catalyst. Technical progress report, October 1, 1987--December 31, 1987
A micelle technique was developed for preparing supported catalysts with different size ruthenium particles. Ruthenium was stabilized on the support, light ends make was minimized and activity was maximized by adjusting the ruthenium particle size and the metal-support interaction. The most promising catalysts consisted of 10--15 nm ruthenium particles on an alumina-titania support and 4--6 nm ruthenium particles on an alumina support. Stability improvement was determined to be the major catalyst developmental need. Work during the next quarter will focus on the development of a stable ruthenium catalyst.
Date:
December 31, 1987
Creator:
Abrevaya, H.
Object Type:
Report
System:
The UNT Digital Library
"Fools for Christ": An Examination of the Ministerial Call in Three Novels by William Golding
This thesis examines the ministerial call in three novels by William Golding, specifically The Spire, Darkness Visible, and Rites of Passage. The central character of each novel, a Christian minister, has a vision, or series of visions, which dominates his life. The call and vision(s) of Golding's ministers are examined in light of Jacques Ellul's The Humiliation of the Word, a work examining the differences between the word and the image. The ministerial call, in this thesis, is linked to Ellul's ideas about the word; the vision, in this thesis, is linked to Ellul's ideas of the image. As a result of following their vision(s) rather than their call, the ministers fail, and their lives end in despair and ruin.
Date:
December 1987
Creator:
Adcox, John Roland
Object Type:
Thesis or Dissertation
System:
The UNT Digital Library
Interview with Dr. Jabr Al-Atrash, December 8, 1987
Interview with Dr. Jabr Al-Atrash, former Syrian ambassador. In the interview, Dr. Al-Atrash discusses current issues in the middle east.
Date:
December 8, 1987
Creator:
Al-Atrash, Jabr & McCaleb, Gary
Object Type:
Video
System:
The Portal to Texas History
Safeguards Effectiveness Evaluations in Safeguards Planning
This paper describes analytic tools we developed to quantify the effectiveness of safeguards against theft of special nuclear material by insiders. These tools help identify vulnerabilities in existing safeguards, suggest potential improvements, and help assess the benefits of these upgrades prior to implementation. Alone, these tools are not sufficient for safeguards planning, since the cost of implementing all suggested upgrades almost always exceeds the available resources. This paper describes another tool we developed to allow comparsion of benefits of various upgrades to identify those upgrade packages that achieve the greatest improvement in protection for a given cost and to provide a priority ranking among cost-effective packages, thereby helping decision-makers select the upgrades to implement and highlight the mount of residual risk. 5 refs., 3 figs.
Date:
December 3, 1987
Creator:
Al-Ayat, R. A.
Object Type:
Article
System:
The UNT Digital Library
Region, Volume 14, Number 12, December 1987/January 1988
Monthly newsletter of the Alamo Area Council of Governments describing news and events of relevance to the agencies.
Date:
December 1987
Creator:
Alamo Area Council of Governments
Object Type:
Journal/Magazine/Newsletter
System:
The Portal to Texas History
[Photograph 2012.201.B0229.0386]
Photograph used for a story in the Daily Oklahoman newspaper. Caption: "Robert Gregory is president of the Putnam City North student council."
Date:
December 1, 1987
Creator:
Albright, Bob
Object Type:
Photograph
System:
The Gateway to Oklahoma History
A Study of Style and Influence in the Early Schools of Violin Making Circa 1540 to Circa 1800
Chapter I of this thesis details contemporary historical views on the origins of the violin and its terminology. Chapters II through VI study the methodologies of makers from Italy, the Germanic Countries, the Low Countries, France, and England, and highlights the aspects of these methodologies that show influence from one maker to another. Chapter VII deals with matters of imitation, copying, violin forgery and the differences between these categories. Chapter VIII presents a discussion of the manner in which various violin experts identify the maker of a violin. It briefly discusses a new movement that questions the current methods of authentication, proposing that the dual role of "expert/dealer" does not lend itself to sufficient objectivity. The conclusion suggests that dealers, experts, curators, and musicologists alike must return to placing the first emphasis on the tradition of the craft rather than on the individual maker.
Date:
December 1987
Creator:
Alcorn-Oppedahl, Allison A. (Allison Ann)
Object Type:
Thesis or Dissertation
System:
The UNT Digital Library
A Comparison of the Performance of the Radical and Conservative Models of Economic Development in the Carribean Basin
The present study is an attempt to compare the performance of two competing models of economic development-- the conservative and radical models. The conservative model is represented by the Central American countries of El Salvador, Guatemala, and Honduras; the radical model is represented by Cuba. The following chapters focus on a comparison of these models as they have manifested themselves in the Carribean basin. The analysis of the performance of the models is conducted by comparing socioeconomic variables of the countries representing the models. The study looks at the time period 1960 - 1980 which coincides with the adoption of the two models in the respective countries.
Date:
December 1987
Creator:
Alfaro, Alban Salazar
Object Type:
Thesis or Dissertation
System:
The UNT Digital Library
An ion beam simulation of the swelling of U/sub 3/Si
Uranium intermetallics are under consideration as possible low-enrichment reactor fuels. These materials divide into two classes with regard to dimensional stability during their service lifetime: those which suffer extreme dimensional growth and those which do not. It has been suggested that the rapid-swelling materials are those that become glassy under irradiation while the low-swelling materials are those that remain crystalline. The structural and dimensional stabilities of U/sub 3/Si (depleted uranium) have been investigated as a function of temperature during Kr irradiation by in situ HVEM observations. Below 550/sup 0/K, this material becomes glassy during 1.0 MeV Kr irradiation. Prolonged irradiation at 475/sup 0/K also leads to rapid darkening of the TEM bright field image of the specimen, growth of the initial perforation at rates which far exceed those due to sputtering, and formation of additional thin areas and holes. Irradiation at 615/sup 0/K does not result in observable image darkening or rapid growth of the initial perforation. After 2 x 10/sup 20/ Kr m/sup -2/, the crystalline material irradiated at 615/sup 0/K is stabilized against subsequent ion-irradiation-induced amorphization and growth at 475/sup 0/K. Similarly, after 2 x 10/sup 20/ Kr m/sup -2/ at 475/sup 0/K, the glassy phase persists at …
Date:
December 1, 1987
Creator:
Allen, C. W.; Birtcher, R. C.; Rehn, L. E. & Hofman, G. L.
Object Type:
Article
System:
The UNT Digital Library
Southwest Retort, Volume 40, Number 9, December 1987
This publication of the Dallas-Fort Worth Section of the American Chemical Society includes information about research, prominent scientist, organizational business, and various other stories of interest to the community.
Date:
December 1987
Creator:
American Chemical Society. Dallas/Fort Worth Section.
Object Type:
Journal/Magazine/Newsletter
System:
The UNT Digital Library
Heavy leptons at the SSC
It is argued that detection of heavy leptons at the Superconducting Super Collider seems to be very difficult but perhaps not impossible. The feasibility is shown to depend critically upon the ability to identify events with W's decaying hadronically and missing transverse momentum. (LEW)
Date:
December 15, 1987
Creator:
Anderson, G. & Hinchliffe, I.
Object Type:
Article
System:
The UNT Digital Library
[Photograph 2012.201.B0072.0162]
Photograph used for a story in the Daily Oklahoman newspaper. Caption: "Hugh Baser has joined Professional Appraisal Service Inc., 10327 N May Ave."
Date:
December 4, 1987
Creator:
Argo, Jim
Object Type:
Photograph
System:
The Gateway to Oklahoma History
[Photograph 2012.201.B0104.0384]
Photograph used for a story in the Daily Oklahoman newspaper. Caption: "Walk into the Famous Amos store and you just might leave with more than cookies."
Date:
December 4, 1987
Creator:
Argo, Jim
Object Type:
Photograph
System:
The Gateway to Oklahoma History
[Photograph 2012.201.B0114.0302]
Photograph used for a story in the Daily Oklahoman newspaper.
Date:
December 9, 1987
Creator:
Argo, Jim
Object Type:
Photograph
System:
The Gateway to Oklahoma History
[Photograph 2012.201.B0140.0246]
Photograph used for a newspaper owned by the Oklahoma Publishing Company.
Date:
December 9, 1987
Creator:
Argo, Jim
Object Type:
Photograph
System:
The Gateway to Oklahoma History
[Photograph 2012.201.B0140.0247]
Photograph used for a newspaper owned by the Oklahoma Publishing Company. Caption: "Traffic is light in Collinsville on another quit day in the northeastern Oklahoma town."
Date:
December 9, 1987
Creator:
Argo, Jim
Object Type:
Photograph
System:
The Gateway to Oklahoma History
[Photograph 2012.201.B0144.0475]
Photograph used for a newspaper owned by the Oklahoma Publishing Company. Caption: "CARTOONS CHAIN SAW ASSIST ...."
Date:
December 9, 1987
Creator:
Argo, Jim
Object Type:
Photograph
System:
The Gateway to Oklahoma History
[Photograph 2012.201.B0145.0236]
Photograph used for a newspaper owned by the Oklahoma Publishing Company.
Date:
December 2, 1987
Creator:
Argo, Jim
Object Type:
Photograph
System:
The Gateway to Oklahoma History
[Photograph 2012.201.B0253.0211]
Photograph used for a story in the Daily Oklahoman newspaper. Caption: "Adrill Hayes framed her own baby dress and shoes along with a picture of herself wearing the dress."
Date:
December 13, 1987
Creator:
Argo, Jim
Object Type:
Photograph
System:
The Gateway to Oklahoma History
[Photograph 2012.201.B0253.0212]
Photograph used for a story in the Daily Oklahoman newspaper. Caption: "A fan decorated with peacock feathers called for a simple frame."
Date:
December 13, 1987
Creator:
Argo, Jim
Object Type:
Photograph
System:
The Gateway to Oklahoma History
[Photograph 2012.201.B0260B.0428]
Photograph used for a story in the Daily Oklahoman newspaper. Caption: "Stan Hoig with his book about Edmond."
Date:
December 8, 1987
Creator:
Argo, Jim
Object Type:
Photograph
System:
The Gateway to Oklahoma History
[Photograph 2012.201.B0271.0201]
Photograph used for a newspaper owned by the Oklahoma Publishing Company. Caption: "Glen Hutchins ( S. W. Bell) - Manager - Network Surveillance & Control"
Date:
December 23, 1987
Creator:
Argo, Jim
Object Type:
Photograph
System:
The Gateway to Oklahoma History
[Photograph 2012.201.B0272.0708]
Photograph used for a story in the Daily Oklahoman newspaper. Caption: "Department of Human Services workers Donna Witty and Jim Igo check the contents of one of scores of toy and food packages donated by DHS employees at their own expense."
Date:
December 23, 1987
Creator:
Argo, Jim
Object Type:
Photograph
System:
The Gateway to Oklahoma History