Wallace, Lance

Product and services of interest include genomics, proteomics, custom research and services, and instruments, accessories, consumables and software. PerkinElmer proprietary technologies include time-resolved fluorescence which is employed in the sensitive Wallac DELFIA system and Wallac LANCE homogeneous assay system, and fluorescence polarization, [FP]2 , a robust fluorescence-based technique for receptor binding assays that is both fast and easy-to-use. 

Wallace, Lance. 1993. A Decade of Studies of Human Exposure What Have We Learned Risk Analysis 13 (April) 135-39. 

A similar terpyridine based chelate is marketed (Perkin-Elmer) as Eu-W8044 DTA chelate 4 and has a dichlorotriazinyl group as a reactive arm [39]. Again the nonadentate complexation increases the stability, the fluorescence is stable at pH 5 and decreases by 20% within 2 h incubation in 50 mM succinate pH 4, but 90% of the fluorescence is lost at pH 3 (the difference of behavior with the Eu-TMT vide supra could be due to the difference in buffer composition). The Eu-W8044 is also more stable in the presence of EOT A and can withstand 2 h in 250 mM EDTA pH 7.8, but manganese effect is still detrimental since 80% of the fluorescence is lost within 30 min in the presence of 100 pM Mn " as described above for the heptadentate Eu-W 1024 chelate, a calculated amount of EDTA cancels the manganese effect (www.perkinelmer.com/lifesciences, Stability of the Wallac LANCE Eu-chelates ). 

Wallace, Lance. The Total Exposure Assessment Methodology (team) Study Summary and Analysis, vol. i. Washington, D.C. Environmental Protection Agency, 1987. 

Lance, A., Wallace, Ph.D., Volatile organic compounds. In Samet, J.M., and Spengler, J.D. (eds.) Indoor air pollution a health perspective. The Johns Hopkins University Press, 1991. 

The authors are grateful to Robert G. Lewis, Thomas M. Spittler, and Lance A. Wallace of the U.S. Environmental Protection Agency Michael G. Ruby of Envirometrics Paul V. Williams of the Northwest Asthma and... 

---