F. Wallace Harrison

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The taxonomically problematic spongillid genus Corvomeyenia Weltner is analyzed. A north-south evolutionary series composed of Corvomeyenia everetti (Mills), Corvomeyenia carolinensis sp. nov., and Corvomeyenia australis Bonetto & Ezcurra de Drago can be demonstrated. C. carolinensis sp. nov. possesses spicular characteristics that indicate genetic(More)
The 2007 National Research Council (NRC) Decadal Survey on Earth Science and Applications from Space recommended Active Sensing of CO(2) Emissions over Nights, Days, and Seasons (ASCENDS) as a midterm, Tier II, NASA space mission. ITT Exelis, formerly ITT Corp., and NASA Langley Research Center have been working together since 2004 to develop and(More)
A new method for the fluorescent staining of sialic acid—containing glycoconjugates in fixed tissues is described. The procedure uses mild periodate oxidation, followed by condensation with dansylhydrazine and reduction of the hydrazones to hydrazines. The specificity of the reaction for sialic acid is tested on model glycoconjugates. The procedure gives(More)
A control architecture is presented for real-time, sensor-based, shared control of remote, multiplemanipulator telerobotic systems. The system allows teleoperation, autonomy, or a combination (shared, telerobotic control). The rate-based system accepts control inputs from a variety of sources (joystick position or velocity, automated path planner position(More)
A novel controller, the Naturally-Transitioning Rate-toForce Controller (NTRFC), is presented for remote telerobotic systems. The controller involves shared control with a resolved-rate algorithm running concomitantly with a force accommodation algorithm, for all Cartesian axes. When the manipulator motion is unconstrained, it performs like a rate(More)
The taxonomic validity, present distribution, and specific threats to the existence of the freshwater sponge,Spongilla sponginosa Penney were investigated. This species, reported only from the type locality, Week's Pond, Sumter County, South Carolina, has apparently been extirpated due to highly acidic pH levels in the pond water. Examination of holotype(More)
The combination of phase contrast photomicrography with a method for phase contrast observation of living sponges facilitated the initial photographic record of spongillid porocyte cellular behavior. Porocytes ofCorvomeyenia carolinensis Harrison (Spongillidae) exhibit true intracellular pores and are components of the incurrent system. The number of(More)
Fluorescent cytochemical techniques, chiefly end-group methods, have been employed in the characterization of cells in calid and algid normal and LUCKE tumor-bearing kidneys of the leopard frog, Rana pipiens. Cytoplasmic RNA and glycogen distribution reflect the known patterns of general metabolic activity of the respective cells in question. Protein(More)
The taxonomic status of Ephydatia subtilis (Weltner) remains undetermined. Despite extensive collecting in the type locality, Lake Kissimmee, Florida, the species was not found. Stratospongilla penneyi sp. nov. is described utilizing spicular diagnosis, cytochemistry, and scanning electron microscopy. Physicochemical data from the type locality are(More)