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14C/C measurements support Andreev's internode method to determine lichen growth rates in Cladina stygia (Fr.) Ahti
Growth rates and the ability to date an organism can greatly contribute to understanding its population biology and community dynamics. 1n 1954, Andreev proposed a method to date Cladina, a fruticose lichen, using total thallus length and number of internodes. No research, however, has demonstrated the reliability of this technique or compared its estimates to those derived by other means. In this study, we demonstrate the utility of {sup 14}C/C ratios to determine lichen age and growth rate in Cladina stygia (Fr.) Ahti collected from northwestern Alaska, USA. The average growth rate using {sup 14}C/C ratios was 6.5 mm {center_dot} yr{sup -1}, which was not significantly different from growth rates derived by Andreev's internode method (average = 6.2 mm {center_dot} yr{sup -1}); thus, suggesting the reliability of Andreev's simple field method for dating lichens. In addition, we found lichen growth rates appeared to differ with geographic location, yet did not seem related to ambient temperature and total precipitation.
Date:
December 5, 2007
Creator:
Holt, E. & Bench, G.
Object Type:
Article
System:
The UNT Digital Library
15th Street News (Midwest City, Okla.), Vol. 37, No. 6, Ed. 1 Friday, October 5, 2007
Newspaper from Rose State College in Midwest City, Oklahoma that includes national, local, and campus news along with advertising.
Date:
October 5, 2007
Creator:
Pace, Joshua
Object Type:
Newspaper
System:
The Gateway to Oklahoma History
2003 Pantex Plant Annual Illness and Injury Surveillance Report, Revised September 2007
Annual Illness and Injury Surveillance Program report for 2003 for the Pantex Plant. DOE is commited to assuring the health and safety of its workers. This includes the conduct of epidemiologic surveillance activities that provide an early warning system for health problems among workers. The IISP monitors illnesses and health conditions that result in an absence of workdays, occupational injuries and illnesses, and disabilities and deaths among current workers.
Date:
October 5, 2007
Creator:
United States. Department of Energy. Office of Illness and Injury Prevention Programs.
Object Type:
Report
System:
The UNT Digital Library
2003 Savannah River Site Annual Illness and Injury Surveillance Report, Revised September 2007
Annual Illness and Injury Surveillance Program report for 2003 for the Savannah River Site. DOE is commitment to assuring the health and safety of its workers includes the conduct of epidemiologic surveillance activities that provide an early warning system for health problems among workers. The report monitors illnesses and health conditions that result in an absence of workdays, occupational injuries and illnesses, and disabilities and deaths among current workers.
Date:
October 5, 2007
Creator:
United States. Department of Energy. Office of Illness and Injury Prevention Programs.
Object Type:
Report
System:
The UNT Digital Library
[2007 Elections for 2008 Board of Directors]
The document requests that TDNA members re-elect one member currently serving on the board of directors and elect either three of four new members depending on who is elected treasurer and who need to fill the spots if the position becomes available.
Date:
October 5, 2007
Creator:
Texas Daily Newspaper Association
Object Type:
Text
System:
The UNT Digital Library
2007 Inventory of Radiochemistry Detector Elements and Compounds
Since the last report, there have been no material changes in the detector element inventories in buildings 151 and 332 at LLNL. Stable element inventories in building 151 have remained stable since the inventory in September 2005. For the first time in many years, Stockpile Radiochemistry personnel viewed radioactive tracer materials that reside in building 332. A list of LLNL tracers and locations are available under separate cover. Despite the recent NNSA agreement to retain 2.8 kg of {sup 233}U for programmatic purposes, we have yet to identify a location that is appropriate and will accept the material. A recent visit to the Oak Ridge National Laboratory (ORNL) in September 2006 revealed nearly 190 kg of material with very high {sup 233}U content scheduled for down-blending in various chemical and isotopic forms. The chemical form, isotopic and chemical purities of this material were such that roughly 150 kg of the material was of comparable composition to the desired tracer package material and would be acceptable for use in an underground test, should the US even conduct such a test. Efforts continue to remove 2.8 kg of material from the down-blend cue and reserve it for the Test Readiness mission.
Date:
April 5, 2007
Creator:
Kenneally, J & Roberts, K
Object Type:
Report
System:
The UNT Digital Library
21st Century Locomotive Technology: Quarterly Technical Status Report 19 DOE/AL68284-TSR19
Nozzle geomtry, pilot injection and post injection effects were studied.
Date:
November 5, 2007
Creator:
Salasoo, Lembit & Topinka, Jennifer
Object Type:
Report
System:
The UNT Digital Library
80th Texas Legislature, Regular Session, House Bill 1, Chapter 1428
Bill introduced by the Texas House of Representatives relating to appropriating money for the support of the Judicial, Executive, and Legislative Branches of the State government, for the construction of State buildings, and for State aid to public junior colleges, for the period beginning September 1, 2007 and ending August 31, 2009; authorizing and prescribing conditions, limitations, rules, and procedures for allocating and expending the appropriated funds; and declaring an emergency. Includes a proclamation issued by the Governor of the State of Texas, issuing a line-item veto of the General Appropriations Bill.
Date:
2007-06-05/2007-06-15
Creator:
Texas. Legislature. House of Representatives.
Object Type:
Legislative Document
System:
The Portal to Texas History
80th Texas Legislature, Regular Session, House Concurrent Resolution 58
Concurrent resolution introduced by the Texas House of Representatives and Senate relating to honoring the Texas Police Chiefs Association for 50 years of service.
Date:
March 5, 2007
Creator:
Texas. Legislature. House of Representatives.
Object Type:
Legislative Document
System:
The Portal to Texas History
80th Texas Legislature, Regular Session, House Concurrent Resolution 68
Concurrent resolution introduced by the Texas House of Representatives and Senate relating to honoring Chris Kyker of Abilene for her many years of service in behalf of the citizens of Texas.
Date:
March 5, 2007
Creator:
Texas. Legislature. House of Representatives.
Object Type:
Legislative Document
System:
The Portal to Texas History
80th Texas Legislature, Regular Session, House Concurrent Resolution 71
Concurrent resolution introduced by the Texas House of Representatives and Senate relating to recognizing the 100th anniversary of First State Bank of Uvalde.
Date:
March 5, 2007
Creator:
Texas. Legislature. House of Representatives.
Object Type:
Legislative Document
System:
The Portal to Texas History
80th Texas Legislature, Regular Session, House Concurrent Resolution 76
Concurrent resolution introduced by the Texas House of Representatives and Senate relating to recognizing Monsignor Larry J. Droll on his 60th birthday.
Date:
March 5, 2007
Creator:
Texas. Legislature. House of Representatives.
Object Type:
Legislative Document
System:
The Portal to Texas History
80th Texas Legislature, Regular Session, House Concurrent Resolution 84
Concurrent resolution introduced by the Texas House of Representatives and Senate relating to welcoming Leadership Kerr County to the State Capitol.
Date:
March 5, 2007
Creator:
Texas. Legislature. House of Representatives.
Object Type:
Legislative Document
System:
The Portal to Texas History
80th Texas Legislature, Regular Session, House Concurrent Resolution 86
Concurrent resolution introduced by the Texas House of Representatives and Senate relating to recognizing February 13, 2007, as Red and Black Day at the State Capitol.
Date:
March 5, 2007
Creator:
Texas. Legislature. House of Representatives.
Object Type:
Legislative Document
System:
The Portal to Texas History
80th Texas Legislature, Regular Session, House Concurrent Resolution 88
Concurrent resolution introduced by the Texas House of Representatives and Senate relating to recognizing the Commemorative Air Force on the occasion of its 50th anniversary.
Date:
March 5, 2007
Creator:
Texas. Legislature. House of Representatives.
Object Type:
Legislative Document
System:
The Portal to Texas History
80th Texas Legislature, Regular Session, House Concurrent Resolution 89
Concurrent resolution introduced by the Texas House of Representatives and Senate relating to designating February 13, 2007, as Midland-Odessa Day at the State Capitol.
Date:
March 5, 2007
Creator:
Texas. Legislature. House of Representatives.
Object Type:
Legislative Document
System:
The Portal to Texas History
80th Texas Legislature, Regular Session, Senate Bill 190, Chapter 4
Bill introduced by the Texas Senate relating to sales and use tax information provided by the comptroller of public accounts to certain municipalities.
Date:
April 5, 2007
Creator:
Texas. Legislature. Senate.
Object Type:
Legislative Document
System:
The Portal to Texas History
80th Texas Legislature, Regular Session, Senate Bill 272, Chapter 5
Bill introduced by the Texas Senate relating to the appointment of bailiffs for the 97th Judicial District.
Date:
April 5, 2007
Creator:
Texas. Legislature. Senate.
Object Type:
Legislative Document
System:
The Portal to Texas History
80th Texas Legislature, Regular Session, Senate Concurrent Resolution 35
Concurrent resolution introduced by the Texas Senate and House of Representatives honoring the Chicano/Hispanic Law Students' Association for enhancing the educational experience of its membership.
Date:
April 5, 2007
Creator:
Texas. Legislature. Senate.
Object Type:
Legislative Document
System:
The Portal to Texas History
Access to Government Information In the United States
The Constitution of the United States makes no specific allowance for any one of the co-equal branches to have access to information held by the others and contains no provision expressly establishing a procedure for, or a right of, public access to government information. Nonetheless, Congress has legislated various public access laws. These include two records access statutes — the Freedom of Information Act and the Privacy Act — and two meetings access statutes — the Federal Advisory Committee Act and the Government in the Sunshine Act. This report provides background on the issue of government transparency and examines relevant litigation.
Date:
December 5, 2007
Creator:
Relyea, Harold C. & Kolakowski, Michael W.
Object Type:
Report
System:
The UNT Digital Library
Accomplishments Achieved Under DOE Grant Number DE-FG03-92ER40693: The Physics of Gain Mechanisms in Self-Amplified Spontaneous Emission in Free Electron Lasers
None
Date:
February 5, 2007
Creator:
Rosenzweig, James
Object Type:
Report
System:
The UNT Digital Library
Adherence and the Medical Management of HIV/AIDS: Stress and Coping
This poster investigates the association of medical adherence to perceived stress, maladaptive coping behaviors, and medical variables in a sample of HIV+ adults.
Date:
November 5, 2007
Creator:
Hua, William Q.; Vosvick, Mark A. & Chng, Chwee-Lye
Object Type:
Poster
System:
The UNT Digital Library
The age of the martian meteorite Northwest Africa 1195 and the differentiation history of the shergottites
Samarium-neodymium isotopic analyses of unleached and acid-leached mineral fractions from the recently identified olivine-bearing shergottite Northwest Africa 1195 yield a crystallization age of 348 {+-} 19 Ma and an {var_epsilon}{sub Nd}{sup 143} value of +40.1 {+-} 1.3. Maskelynite fractions do not lie on the Sm-Nd isochron and appear to contain a martian surface component with low {sup 147}Sm/{sup 144}Nd and {sup 143}Nd/{sup 144}Nd ratios that was added during shock. The Rb-Sr system is disturbed and does not yield an isochron. Terrestrial Sr appears to have affected all of the mineral fractions, although a maximum initial {sup 87}Sr/{sup 86}Sr ratio of 0.701614 {+-} 16 is estimated by passing a 348 Ma reference isochron through the maskelynite fraction that is least affected by contamination. The high initial {var_epsilon}{sub Nd}{sup 143} value and the low initial {sup 87}Sr/{sup 86}Sr ratio, combined with the geologically young crystallization age, indicate that Northwest Africa 1195 is derived from a source region characterized by a long-term incompatible element depletion. The age and initial Sr and Nd isotopic compositions of Northwest Africa 1195 are very similar to those of Queen Alexandra Range 94201, indicating these samples were derived from source regions with nearly identical Sr-Nd isotopic systematics. These …
Date:
April 5, 2007
Creator:
Symes, S; Borg, L; Shearer, C & Irving, A
Object Type:
Article
System:
The UNT Digital Library
AIR PERMIT COMPLIANCE FOR WASTE RETRIEVAL OEPRATIONS INVOLVING MULTI-UNIT OPERATIONS
Since 1970, approximately 38,000 suspect-transuranic and transuranic waste containers have been placed in retrievable storage on the Hanford Site in the 200 Areas burial grounds. Hanford's Waste Retrieval Project is retrieving these buried containers and processing them for safe storage and disposition. Container retrieval activities require an air emissions permit to account for potential emissions of radionuclides. The air permit covers the excavation activities as well as activities associated with assaying containers and installing filters in the retrieved transuranic containers lacking proper venting devices. Fluor Hanford, Inc. is required to track radioactive emissions resulting from the retrieval activities. Air, soil, and debris media contribute to the emissions and enabling assumptions allow for calculation of emissions. Each of these activities is limited to an allowed annual emission (per calendar year) and .contributes to the overall total emissions allowed for waste retrieval operations. Tracking these emissions is required to ensure a permit exceedance does not occur. A tracking tool was developed to calculate potential emissions in real time sense. Logic evaluations are established within the tracking system to compare real time data against license limits to ensure values are not exceeded for either an individual activity or the total limit. Data input …
Date:
November 5, 2007
Creator:
FM, SIMMONS
Object Type:
Article
System:
The UNT Digital Library