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- Adaptation (Biology) (1)
- Aerobic metabolism (1)
- Aminopeptidase (1)
- Cancer borealis (1)
- Comparative studies (1)
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- Compartmentalization (1)
- Dehydration (1)
- Environment (1)
- Ghost crab (1)
- Inactivation (1)
- Locomotion (1)
- Meaning (1)
- Neuromodulation (1)
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- Pleistocene finger flutings (1)
- Proctolin (1)
- Pyloric rhythm (1)
- Relationship with the environment (1)
- Stomatogastric ganglion (1)
- Stomatogastric nerve axon (1)
- Synaptic inputs (1)
Articles 1 - 5 of 5
Full-Text Articles in Life Sciences
Functional Consequences Of Compartmentalization Of Synaptic Input, Melissa J. Coleman, Michael P. Nusbaum
Functional Consequences Of Compartmentalization Of Synaptic Input, Melissa J. Coleman, Michael P. Nusbaum
WM Keck Science Faculty Papers
Intra-axonal recordings of stomatogastric nerve axon 1 (SNAX1) indicate that there are synaptic inputs onto the SNAX1 terminals in the stomatogastric ganglion (STG) of the crab Cancer borealis (Nusbaum et al., 1992b). To determine whether this synaptic input only influenced SNAX1 activity within the STG, we identified the SNAX1 soma in the commissural ganglion (CoG). We found that this neuron has a neuropilar arborization in the CoG and also receives synaptic inputs in this ganglion. Based on its soma location, we have renamed this neuron modulatory commissural neuron 1 (MCN1). While intracellular stimulation of MCN1soma and MCN1SNAX has the same …
Neuropeptide Degradation Produces Functional Inactivation In The Crustacean Nervous System, Melissa J. Coleman, P. H. Konstant, B. S. Rothman, Michael P. Nusbaum
Neuropeptide Degradation Produces Functional Inactivation In The Crustacean Nervous System, Melissa J. Coleman, P. H. Konstant, B. S. Rothman, Michael P. Nusbaum
WM Keck Science Faculty Papers
The pentapeptide proctolin (Proct.; Arg-Tyr-Leu-Pro-Thr) is a modulatory transmitter found throughout the crustacean nervous system. No information is available in this system, however, as to how the actions of this peptide are terminated. To study this issue in the crab Cancer borealis, we incubated exogenous proctolin (10(-5) M) with either the thoracic ganglion (TG) or with conditioned saline (CS) that had been preincubated with the TG. We removed aliquots at standard time points for analysis by reverse-phase high-performance liquid chromatography (HPLC). We found that over time the proctolin peak became progressively smaller, while three novel peaks appeared and increased in …
Predicting The Past, Recounting The Future: Human Ecology And A Prehistory Of Consciousness, Paul Faulstich
Predicting The Past, Recounting The Future: Human Ecology And A Prehistory Of Consciousness, Paul Faulstich
Pitzer Faculty Publications and Research
This paper is concerned with the organic derivation and primary meaning of Pleistocene finger flutings; I propose that in order to gain insight into the significance of the flutings, we must attempt an understanding of the physical and mental contexts in which they emerged. I suggest that finger flutings provided a cultural record in the Pleistocene which documented thought and action, and made it ready for reflection. Through the process of finger fluting, the human 'self' was objected and reality was modified in the experience of self-consciuosness. I argue that finger flutings, like language, were employed to discover and convey …
Moderate Dehydration Decreases Locomotor Performance Of The Ghost Crab, Ocypode Quadrata, Randi B. Weinstein, Robert J. Full, Anna N. Ahn
Moderate Dehydration Decreases Locomotor Performance Of The Ghost Crab, Ocypode Quadrata, Randi B. Weinstein, Robert J. Full, Anna N. Ahn
All HMC Faculty Publications and Research
The effect of dehydration on the aerobic metabolism and endurance of sustained, terrestrial locomotion was determined for the ghost crab, Ocypode quadrata, The rate of evaporative water loss, measured as the percentage of decrease in body mass per hour, was influenced by ambient temperature (Tₐ), Increasing Tₐ from 24° C to 30° C (40%-50% relative humidity) increased the rate of water loss from 2.3% hˉ¹ ± 0.2% hˉ¹ to 3.6% hˉ¹ ± 0.6% hˉ¹. Crabs were divided into three treatment groups to determine the effect of dehydration on aerobic metabolism: hydrated control crabs, slowly dehydrated crabs, and rapidly dehydrated …
Why Not To Do Two-Species Comparative Studies: Limitations On Inferring Adaptation, Theodore Garland Jr., Stephen C. Adolph
Why Not To Do Two-Species Comparative Studies: Limitations On Inferring Adaptation, Theodore Garland Jr., Stephen C. Adolph
All HMC Faculty Publications and Research
Claims about adaptation are commonly made from comparative studies involving only two species (or only two populations of a single species). Our main purpose here is to alert practitioners to several logical and statistical problems associated with using two-species comparisons for studying adaptation and to outline some alternative approaches. Multispecies comparisons are one such alternative. However, data from multiple species may not be independent or identically distributed in the statistical sense, which violates assumptions of ordinary statistical methods (Harvey and Pagel 1991). We therefore also discuss one phylogenetically based statistical method that can be employed for valid hypothesis testing with …