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 59 for “"Isthmus"”.
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Spatial language and cognition in Isthmus Zapotec
How are linguistic and cognitive practices shared among individuals (and more broadly) populations and cultures? Further, how are cognitive strategies shared at the local level? Li and colleagues (Li & Gleitman 2002; Li et al 2011; inter alia) suggest that the variation observed in reference frame …
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Losers in the isthmus: Central America in American literature
… narratives. Nonetheless, their vision of the isthmus and the kind of Americans that go there, and ultimately of the US itself, has remained remarkably similar--almost immutable--for all this time. This vision and its renewal has had its stimulus in the US' aggressive management of its …
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Simulation modeling of a container landbridge system across the Isthmus of Tehauntepec, Mexico
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Ocean Engineering, 1990.
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The Genomics of Divergence and Adaptation in Sister Reef Fishes Separated by the Isthmus of Panamá
… difficult to reconstruct. The emergence of the Isthmus of Panamá provides a unique, natural experiment where multiple populations of marine species have been divided and exposed to radically different environmental conditions. This event provides the ideal setting to explore adaptive divergence …
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Characteristics of sperm binding to the mouse oviduct
… of sperm binding was determined using the isthmus, ampulla, and trachea (n = 4). The results showed no difference in binding between isthmus and trachea (P > 0.05) but binding to the ampulla was less than the isthmus (P < 0.05). Capacitation status also affected sperm binding (n = 3). The …
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The Acacia Berlandieri Species Group: Armed New World Members of Subgenus Aculeiferum (Fabaceae) With Distributions Restricted North of the Isthmus of Tehuantepec, Mexico
Data from all 15 non-hybrid ingroup and seven outgroup species for 24 discrete morphological characters were analysed by unconstrained simultaneous parsimony analysis using PAUP* 4.0, both with and without hybrids. For these analyses with the branch-and-bound algorithm, the character states were …
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Temporal and spatial controls of cell fate specification in the cerebellum
… centres, the midbrain-hindbrain boundary (isthmus) and the roof plate of the fourth ventricle. Two major precursor pools give rise to all the cells of the cerebellum: the ventricular zone and the cerebellar rhombic lip. The rhombic lip comprises a dorsal progenitor population, defined by …
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Regulation of boar sperm function by the oviduct – formation of a sperm reservoir, modulation of Ca 2+ influx, and release from storage
… tract is transported to the lower oviduct (isthmus) to form a functional sperm reservoir. The sperm reservoir extends sperm lifespan, prevents polyspermic fertilization, and is implicated in the regulation of capacitation. Once capacitated, a small number of sperm is released from the …
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The Ecology and Demography of the Invasive Ascidian Botrylloides violaceus in the Coos Estuary
… and observed B. violaceus at all sites except Isthmus Slough in the upper bay. In laboratory experiments B. violaceus survived temperatures up to 27°C and salinities down to 25 psu, conditions which would permit survival at the uninvaded Isthmus Slough. Furthermore, the species survived …
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Corpus callosum morphology in children on mid-sagittal MR imaging
… the CC was less likely to have an identifiable isthmus and was more likely to be convex, thin and have separation of the fornix insertion (all p<0.01). In young children (< 5 years) the CC was also less likely to have an identifiable isthmus (p=0.01) and was more likely to be convex (p=0.04) but …
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Familiar Food-Induced Feeding Activation in C. Elegans
… two muscle motions, pharyngeal pumping and isthmus peristalsis, and the frequencies of the two feeding motions dramatically increase in response to food as in other organisms. I attempted to understand the mechanism underlying food-induced feeding activation by studying the mechanism and the …
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New Caledonia´s Wake: Expanding the Story of Company of Scotland Expeditions to Darien, 1698-1700
… Scotland initiative to establish a colony on the Isthmus of Panama have emphasized its impact on the political future of Great Britain, the endeavor also intruded into a broader spectrum of geography, commercial enterprise and sociopolitics. The thesis examines the wider reverberations of the …
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Hiding in plain sight: unveiling cryptic diversity and patterns in bumble bees
… range, with major barriers to gene flow at the Isthmus of Tehuantepec in southern Mexico and the Nicaraguan Depression in southern Nicaragua. Wing morphometric data support these genetic divisions within the species complex. The differences in wing shape are not sufficiently divergent to be …
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Finite element reconstruction of real world aortic injury in near-side lateral automotive crashes with conceptual countermeasures
… strain (AMPS) in the root, ascending, and the isthmus regions of the aorta were calculated and model predicted high strain areas were compared with real world injury reports. In seven of the eight cases aortic failure occurred in the isthmus region and, the average peak tensile isthmic strain, …
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Retrospektive Analyse von ventrikulären Makroreentrytachykardien bei Patienten nach Korrekturoperation einer Fallot
… Untersuchung als kritischer Isthmus der Tachykardie identifiziert worden, so dass dort die Hochfrequenzstromapplikation erfolgt war. Bei einer Patientin war während der elektrophysiologischen Untersuchung durch das Isopotentialmapping ein kritischer Isthmus in der Nähe des …
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Rock matters: a geological basis for understanding the Rock at the Ness of Brodgar, Orkney
… Discovered in 2003, the site is located on an isthmus of land between two lochs and is equidistant between the Ring of Brodgar and the Stones of Stenness stone circles. The site consists of more than two dozen drystone buildings encircled by a massive wall. To date, ten per cent of the site has …
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Morphological imaging of the canine thyroid gland with an application towards hypothyroid dogs
… Bijschildklieren werden niet gezien en een isthmus werd slechts bij 1 op de 25 honden aangetroffen. Gezien de uitstekende zichtbaarheid en kenmerkende eigenschappen van de normale schildklier bij de hond besloten we dat het gebruik van CT voordelig zou kunnen zijn om het onderscheid te maken …
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Ecology of the Tropical Freshwater Turtle Rhinoclemmy's Funerea in Caribbean Costa Rica
… strictly neotropical distribution from the Isthmus of Panama northward along the Caribbean drainage to southern Honduras. Ecological studies of this species were conducted at Tortuguero, Costa Rica from 1990 to 1992. Adult R. funerea were the dominant aquatic turtle and occupied lotic …
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The Mechanism of the Gastric Epithelial Stem Cell Response to Metaplastic Injury
… within the normal stem cell niche in the isthmus of the gastric unit. Here we show that CD44 labels the membranes of such undifferentiated isthmal cells, both in the normal gastric epithelium and when those cells expand fourfold upon injury with tamoxifen. Loss of CD44, either in knockout …
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The influence of vicariance and dispersal on the diversification and evolution of springtails (collembola)
… multiple geminate species pairs spanning the Isthmus and molecular analyses revealed examples of pre-Pliocene vicariance, post-closure dispersal, and cryptic diversification across the Isthmus of Panama. This study not only demonstrates that ecological specialization can (but not always) …
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