USDA, Forest Service, PO Box 2750, Asheville, NC 28802

66 -- PORTABLE PHOTOSYNTHESIS SYSTEMS SOL RFQ SE-96-73. Due 080696. Contact Nancy H Meadows, 704/257-4297, FAX 704/257-4876; Contracting Officer, Byron B Brown, 704/257-4288. Forestry Sciences Laboratory, Athens, Georgia. Two Li-Cor LI-6400 Portable Photosynthesis Systems or approved equal, as follows: Two complete dual path non-dispersive infrared analyzers that measure both CO2 and H2O conc. One analyzer measures CO2 and H2O conc in the sample chamber while the second analyzer simultaneously measures CO2 and H2O in the reference airstream. Both analyzers must be located in the sensor head so that the gas conc are measured within the leaf cuvette mixing volume. Gas samples cannot be pumped from the leaf cuvette to the analyzers through hoses, as this will result in time delays that confound correlations between gas exchange and changes in environmental drivers. The system software must be able to automatically and independently set and hold the leaf chamber CO2 mole fraction between 0 and 2000 ppm, and the H2O mole fraction to a user-specified value using a fast null-balance procedure. All responsible parties may submit an offer which will be considered. Submit requests for solicitation, in writing or by fax, to Nancy H Meadows at the address shown in block 7. See Note 22. (187)

Loren Data Corp. http://www.ld.com (SYN# 0450 19960710\66-0008.SOL)