2.7 Lincoln University Senior Class of 1935

After graduation, Lloyd Gaines filed papers with placement office at Lincoln but he could not find an immediate position. Although he minored in education, Gaines was not primarily searching for a teaching position. However, he had a backup plan. Lloyd's background in history led him to an interest in the law and unbeknownst to anyone, save his mentor, Lorenzo Greene, he was preparing to what no American-American had done before. Lloyd Gaines was going to enroll in the University Missouri School of Law.

Stepwise Photoinhibition of Photosystem II1 : Studies with Synechocystis Species PCC 6803 Mutants with a Modified D-E Loop of the Reaction Center Polypeptide D1

Several mutant strains of Synechocystis sp. PCC 6803 with large deletions in the D-E loop of the photosystem II (PSII) reaction center polypeptide D1 were subjected to high light to investigate the role of this hydrophilic loop in the photoinhibition cascade of PSII. The tolerance of PSII to photoinhibition in the autotrophic mutant ΔR225-F239 (PD), when oxygen evolution was monitored with 2,6-dichloro-p-benzoquinone and the equal susceptibility compared with control when monitored with bicarbonate, suggested an inactivation of the QB-binding niche as the first event in the photoinhibition cascade in vivo. This step in PD was largely reversible at low light without the need for protein synthesis. Only the next event, inactivation of QA reduction, was irreversible and gave a signal for D1 polypeptide degradation. The heterotrophic deletion mutants ΔG240-V249 and ΔR225-V249 had severely modified QB pockets, yet exhibited high rates of 2,6-dichloro-p-benzoquinone-mediated oxygen evolution and less tolerance to photoinhibition than PD. Moreover, the protein-synthesis-dependent recovery of PSII from photoinhibition was impaired in the ΔG240-V249 and ΔR225-V249 mutants because of the effects of the mutations on the expression of the psbA-2 gene. No specific sequences in the D-E loop were found to be essential for high rates of D1 polypeptide degradation.

Coffee / by B. E. Dahlgren, Chief Curator, Dept. of Botany.

no.22(1938)

Bibliographic index of North American archaeocyathids / [by] Matthew H. Nitecki --

v.17:no.2(1967)

A forest of the coal age / by B. E. Dahlgren, Acting Curator, Dept. of Botany.

no.14(1933)

Traditions of the Arapaho, collected under the auspices of the Field Columbian museum and of the American museum of natural history, by George A. Dorsey -- and Alfred L. Kroeber --

v.5(1903)

Crocodile hunting in Central America / by Karl P. Schmidt, Chief Curator, Dept. of Zoology.

no.15(1952)

Aleutian islanders; Eskimos of the north Pacific / by George I. Quimby, Curator of Exhibits, Dept. of Anthropology. Drawings by Helen Z. Quimby.

no.35(1944)

Economic, social, and demographic characteristics of Spanish-American wage workers on U.S. farms /

Cover title.