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The absorption of the important fission products by plants is quantitatively presented as a concentration factor which is defined as the ratio of the fission product concentration found in the leaves to the fission product concentration found in the nutrient substrate. Of the fission products, the isotopes of strontium were found to be the most important by virtue of their high concentration factor, long half-life, and low maximum permissible amounts for animals. Iodine and barium follow in importance, with cesium moderately important in some soils. All other fission products have concentration factors less than strontium by 100 or more. The effect on the concentration factor of different agricultural plants, as well as different organs of the same plant, causes variations of about a factor of ten or less for each isotope. The concentration factor tends to increase as the pH of the nutrient substrate is decreased. Addition of stable carrier to the substrate does not decrease the amount of the radioactive isotope that is absorbed into the plant. The presence of iodine and yttrium carrier actually causes a significant increase in the concentration of the respective radioactive isotopes in the plant tissue.
Date:
May 17, 1955
Creator:
Rediske, J. H.; Cline, J. F. & Selders, A. A.
Object Type:
Report
System:
The UNT Digital Library
Maize-Header.
Patent for simple and efficient maize header which is easy to operate by positioning it in a way that it needs minimum effort to operate.
Date:
May 17, 1921
Creator:
Jordan, Andrew P.
Object Type:
Patent
System:
The Portal to Texas History
Cotton-Cultivator.
Patent for an improved cultivator used for tillage when the plows are not in the ground. The cultivator can also lighten the heaviness felt by the operator while the plow is being used.
Date:
May 17, 1921
Creator:
Barnett, James Samuel
Object Type:
Patent
System:
The Portal to Texas History
Combination Steeper and Dripper.
Patent for improvements of steeper and drippers combinations, specifically for tea or coffee, where a container the same depth of the pot will be provided in order to steep grounds easily and quicker.
Date:
May 17, 1920
Creator:
Nicholls, George Habberton
Object Type:
Patent
System:
The Portal to Texas History
Holder for Dental X-Ray Films.
Patent for dental X-Ray holders that securely hold the film in place and categorize the X-Rays into series that comprise views of the whole mouth.
Date:
May 17, 1921
Creator:
Martin, James Madison
Object Type:
Patent
System:
The Portal to Texas History
Plastic Base for Poles.
Patent for a plastic base for poles which aims to lengthen the life of the average pole and enable the use of poles of shorter lengths.
Date:
May 17, 1921
Creator:
Hoyle, Millard F.
Object Type:
Patent
System:
The Portal to Texas History
Gradometer.
Patent for a gradometer "which will accurately indicate under the most varying and unstable conditions the inclination and declination at which any moving body is traveling" (lines 10-13). The gradometer is "particularly adapted for use on motor vehicles" (lines 15-16).
Date:
May 17, 1921
Creator:
Hall, Sidney Wilson
Object Type:
Patent
System:
The Portal to Texas History
Wheel-Operated Lift Mechanism
Patent for a wheel operated lift mechanism designed for agricultural implements with wheels which can raise the frame of the agricultural implement for easy access to the wheel. This tool is adjustable to raise or lower the frame for easy access to the wheel to disconnect it.
Date:
May 17, 1921
Creator:
Altgelt, Herman E.
Object Type:
Patent
System:
The Portal to Texas History
Guide for Drive-Chains.
Patent for a mechanism designed to prevent a guide chain from being displaced from the wheel(s) of its parent machine.
Date:
May 17, 1921
Creator:
Johnston, Horace G.
Object Type:
Patent
System:
The Portal to Texas History
Draft Attachment for Motor-Vehicles.
Patent for a draft attachment by which a motor vehicle may "pull itself free when its traction wheels have become embedded in a soft or muddy road" (lines 14-16).
Date:
May 17, 1921
Creator:
Worsham, Louis W.
Object Type:
Patent
System:
The Portal to Texas History
Steering Attachment.
Patent for a steering attachment that keeps the steering wheels of a motor driven vehicle straight. This device is simple and relatively inexpensive, among other advantages.
Date:
May 17, 1921
Creator:
Huffman, Orla L.
Object Type:
Patent
System:
The Portal to Texas History
Toupee and Wig Retainer
A patent for a single-sided adhesive that holds a toupee or wig in place on the scalp without causing built-up residue to adhere to the wig.
Date:
May 17, 1921
Creator:
Tapscott, John Christoper
Object Type:
Patent
System:
The Portal to Texas History
Washing-Machine.
Patent for a mechanized dolly to improve washing machine functionality and efficiency.
Date:
May 17, 1921
Creator:
Huffman, Orla L.
Object Type:
Patent
System:
The Portal to Texas History
Photogeologic map of the Kaiparowits Peak-1 quadrangle, Garfield County, Utah
Photogeologic map of the Kaiparowits Peak-1 quadrangle, Garfield County, Utah
Date:
May 17, 1955
Creator:
Detterman, Janis S.
Object Type:
Map
System:
The UNT Digital Library
86th Texas Legislature, Regular Session, House Bill 2263, Chapter 53
Bill introduced by the Texas House of Representatives relating to the sale of electric power to certain public customers.
Date:
May 17, 2019
Creator:
Texas. Legislature. House of Representatives.
Object Type:
Legislative Document
System:
The Portal to Texas History
86th Texas Legislature, Regular Session, House Bill 81, Chapter 45
Bill introduced by the Texas House of Representatives relating to the disclosure under the public information law of certain information related to parades, concerts, or other entertainment events open to the general public that are paid for with public funds.
Date:
May 17, 2019
Creator:
Texas. Legislature. House of Representatives.
Object Type:
Legislative Document
System:
The Portal to Texas History
86th Texas Legislature, Regular Session, House Concurrent Resolution 152
Concurrent resolution introduced by the Texas House of Representatives and Senate honoring the Bluebonnet Girls State Program for its more than 75 years of service.
Date:
May 17, 2019
Creator:
Texas. Legislature. House of Representatives.
Object Type:
Legislative Document
System:
The Portal to Texas History
86th Texas Legislature, Regular Session, House Concurrent Resolution 165
Concurrent resolution introduced by the Texas House of Representatives and Senate congratulating Ramona Aytes Thomas of Midland on her retirement as CEO of PermiaCare.
Date:
May 17, 2019
Creator:
Texas. Legislature. House of Representatives.
Object Type:
Legislative Document
System:
The Portal to Texas History
86th Texas Legislature, Regular Session, House Concurrent Resolution 163
Concurrent resolution introduced by the Texas House of Representatives and Senate commemorating the 30th anniversary of the Allergan company's Waco Manufacturing Facility.
Date:
May 17, 2019
Creator:
Texas. Legislature. House of Representatives.
Object Type:
Legislative Document
System:
The Portal to Texas History
86th Texas Legislature, Regular Session, House Bill 2714, Chapter 56
Bill introduced by the Texas House of Representatives relating to the registration of liquefied petroleum gas container manufacturers and the regulation of liquefied petroleum gas licensees; authorizing fees.
Date:
May 17, 2019
Creator:
Texas. Legislature. House of Representatives.
Object Type:
Legislative Document
System:
The Portal to Texas History
86th Texas Legislature, Regular Session, House Bill 2223, Chapter 52
Bill introduced by the Texas House of Representatives relating to the exemption of certain commercial weighing or measuring devices from registration and inspection requirements.
Date:
May 17, 2019
Creator:
Texas. Legislature. House of Representatives.
Object Type:
Legislative Document
System:
The Portal to Texas History
86th Texas Legislature, Regular Session, House Bill 2675, Chapter 55
Bill introduced by the Texas House of Representatives relating to the repeal of the provisions providing for the suspension of the collection of certain fees when the balance in the oil and gas regulation and cleanup fund exceeds a specified amount.
Date:
May 17, 2019
Creator:
Texas. Legislature. House of Representatives.
Object Type:
Legislative Document
System:
The Portal to Texas History
86th Texas Legislature, Regular Session, House Bill 1995, Chapter 49
Bill introduced by the Texas House of Representatives relating to the distribution to the Texas Racing Commission of certain money deducted from simulcast pari-mutuel pools.
Date:
May 17, 2019
Creator:
Texas. Legislature. House of Representatives.
Object Type:
Legislative Document
System:
The Portal to Texas History
86th Texas Legislature, Regular Session, House Bill 1802, Chapter 47
Bill introduced by the Texas House of Representatives relating to a request for binding arbitration of certain appraisal review board orders.
Date:
May 17, 2019
Creator:
Texas. Legislature. House of Representatives.
Object Type:
Legislative Document
System:
The Portal to Texas History