Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 80 for “"species differences"”.
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The genetics of species differences within the genus Nasonia ASHMEAD 1904 (Hymenoptera: Pteromalidae)
The genetics of species differences is an outstanding question in evolutionary biology. How do species evolve to become phenotypically distinct and how is the genetic architecture organized that underlie species differences? Phenotypic diverged traits are supposed to be frequently involved in …
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Are Large Dogs Smarter Than Small Dogs? Investigating Within Species Differences in Large and Small Dogs: Spatial Memory
… and behaviorally. Breed based cognitive differences have not been found but some studies suggest there may be differences in broader categories such as working disposition and sex. The influence of size on canine cognition has not been thoroughly addressed despite the fact that large dogs …
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Effect of cell- and species-differences in the expression of drug metabolism enzymes on chemical-induced injury to the rat and human kidney
Differences in the expression of drug metabolizing enzymes between cells of the rat and human kidney on chemical-induced nephrotoxicity were studied. Rat renal proximal tubular (rPT) and distal tubular (rDT) cells differed in their susceptibility to trichloroethylene (Tri) and thiophene-containing …
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A unified population model of Calanus finmarchicus and C. helgolandicus in the North Atlantic
… This forces us to consider not simply individual species, but the species that may replace them and play similar roles in an ecosystem. Here we consider the important zooplankton species Calanus finmarchicus and C. helgolandicus. Recent climate change has resulted in the gradual replacement of C. …
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Use of a Two-Action Paradigm Apparatus with Captive Lemurs: Insights into Social Learning
… to test social learning abilities in seven lemur species at the Duke Lemur Center. There were three groups: push (had model previously taught to push), pull (had model previously taught to pull), and control (no model). I conducted experimental trials to determine if lemurs in push/pull groups …
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The Adaptive Value of Complex Socio-Communicative Behavior
… current study investigated the similarities and differences in sociality and communicative production between bonobos and chimpanzees in captive settings, using 9, 10-minute focal follows for each individual. Analyses revealed a significant positive correlation between social proximity score and …
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Comparative Studies of Numerical Cognition in Nonhuman Primates: From Numerical Comparison to Arithmetic
… in wide-ranging taxa or using individual species as models for comparisons with humans. Recent findings in numerical cognition have suggested that evidence for approximate numerical abilities in nonhuman species may indicate that humans and animals share a cognitive system for representing …
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Defending the Multiple Realization Argument against the Identity Theory
… Finally I offer empirical evidence from inter-species differences in humans and monkeys, and also from a case of extensive neural plasticity, which shows that mental state types are multiply realized in brain state types.</p>
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Quantitative characterization of the microstructure of selected Brazilian hardwood species using stereological methods
… sections of 22 Brazilian tropical hardwood species. A minimum of 4 different trees, one slide per tree and 20 or 30 sampling fields per slide for each species were studied. Simple point fractions (P<sub>p</sub>), intersection counts (P<sub>L</sub>), and number of anatomical elements per unit …
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Evolutionary analysis of mammalian genomes and associations to human disease
… indicative of functional adaptations that drive species differences. Genes that underwent positive selection during the evolution of humans and four mammals used to model human diseases (mouse, rat, chimpanzee and dog) were identified, using maximum likelihood methods. I show that genes under …
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GDF9 and BMP15: species difference and synergistic interactions.
… factors which impact their efficiency, including species difference of the proteins, GDF9/BMP15 interactions and the presence of post-translational modifications. However, factors such as species difference and post-translational modifications have yet to be investigated in terms of their effects …
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Field Behavior Comparison of 8 Species of California Desert Ants
… patrolling, and convening, also differed among species in hour and/or in relative proportion of such activity. Finally, interesting species differences were seen in climbing ability, running time between stops, and response to air blasts (Messor oergandei and Pheidole barbata were the least …
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The hormonal regulation of PIN protein localisation and its relevance to shoot architecture
… growth dynamics. Finally, I demonstrate cross-species differences in PIN hormone responses. As a whole, this work advances our understanding of hormonal control of auxin transport in the shoot and the way in which this affects shoot architecture.
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Using human metabolic enzyme profiling as an innovative technology in the drug development process
… from animal data has been unsuccessful due to species differences in the enzymes involved in drug metabolism. Recent progress in molecular biology made it possible to develop in vitro drug metabolism systems using human metabolic enzymes, such as purified microsomes or expressed cytochrome …
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The physiological effects of elevated carbon dioxide, in the context of non-physical fish barriers, on unionid mussels
… taxa worldwide, with more than half (71%) of the species in North America listed as threatened, endangered, or already extinct. This, coupled with the fact that there have been many studies documenting a negative impact of elevated CO2 on marine invertebrates, demonstrates a critical knowledge gap …
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Some factors influencing serum triglyceride in man
… out in experimental animals which show marked species differences from man with regards kinetic behaviour of serum and liver triglycerides(l). Where relevant, of course, reference has been made to these studies. The significance of each of the three studies has been discussed separately, but …
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Comparing simple and complex native forage mixtures for grazing cattle in southwestern Saskatchewan
… matter digestibility of native and tame forage species common to or having potential in Southwestern Saskatchewan. In study one, plots were seeded in 2006 on Chernozemic Orthic Brown Swinton Loam soils and consisted of 11 native and three tame monoculture species common to southwestern …
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Advanced Bioelectronic and Microphysiological Systems for Functional Studies of Stem Cell-Derived Neural Models
… • Neuroweb enabled the detection of cross-species differences in signalling using air-liquid interface cerebral organoids and changes in oscillatory activity possibly linked to metabolic recycling. • The development of a full GUI framework for electrophysiological analysis, providing …
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