Relevant bibliographies by topics / Microsaur

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  1. Journal articles
  2. Dissertations / Theses
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Academic literature on the topic 'Microsaur'

Author: Grafiati
Published: 4 June 2021
Last updated: 1 February 2022

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Journal articles on the topic "Microsaur"

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Carroll, Robert L., Paul Bybee, and William D. Tidwell. "The oldest microsaur (Amphibia)." Journal of Paleontology 65, no. 2 (1991): 314–22. http://dx.doi.org/10.1017/s0022336000020552.

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Utaherpeton franklini n. gen. and sp., from the Manning Canyon Shale Formation of Utah, is the oldest known microsaur. The horizon is dated as equivalent to the lowermost Namurian B of Europe (transitional from Upper Mississippian into lowermost Pennsylvanian in North American terminology) on the basis of a rich assemblage of fossil plants. The specimen may be tentatively placed within the suborder Microbrachomorpha. It exhibits the primitive character state for many microsaur features, but no synapomorphies are recognized that support a specific sister-group relationship between microsaurs and any other group of Paleozoic tetrapods.
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Mann, Arjan, and Hillary C. Maddin. "Diabloroter bolti, a short-bodied recumbirostran ‘microsaur’ from the Francis Creek Shale, Mazon Creek, Illinois." Zoological Journal of the Linnean Society 187, no. 2 (2019): 494–505. http://dx.doi.org/10.1093/zoolinnean/zlz025.

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AbstractThe Carboniferous (Pennsylvanian; 309–307 Mya) ‘Mazon Creek’ Lagerstätte produces some of the earliest tetrapod fossils of major Palaeozoic lineages. Previously, the Mazon Creek record of ‘microsaurs’ was known from a single specimen. However, the lack of key anatomy, such as the skull, precluded a confident taxonomic assignment, thus only a suggested affinity to the microbrachimorph ‘microsaur’ Hyloplesion was determined. Recently several new tetrapod specimens collected from Mazon Creek have come to light, of which some have recumbirostran ‘microsaur’ affinity. Here we describe a new genus and species of short-bodied recumbirostran, Diabloroter bolti, on the basis of a unique combination of autapomorphies. Both parsimony and Bayesian phylogenetic methods recover the new taxon in the Brachystelechidae clade, as sister to a clade including Carrolla and Batropetes. We determine Diabloroter to be the earliest known member of Brachytelechidae and thus establishing a Carboniferous origin of the family. We also provide an updated diagnosis for Brachystelechidae. Finally, we comment on the evolutionary trends in the clade, including dental adaptations for a proposed algivorous diet in derived clade members.
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Lombard, R. Eric, and John R. Bolt. "A microsaur from the Mississippian of illinois and a standard format for morphological characters." Journal of Paleontology 73, no. 5 (1999): 908–23. http://dx.doi.org/10.1017/s0022336000040749.

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The oldest known microsaur is preserved in a nodule from the Kinkaid Formation (Mississippian; Elvirian) collected near Goreville, Illinois. At least eight individuals are represented: three by partial skulls plus vertebral column segments with associated limb elements, and five by postcrania only. Skulls are crushed, incomplete, and exposed mainly in palatal view. Palatal bones are denticulate and the palatine has in addition a single large tooth. The basipterygoid process is laterally directed and the basipterygoid joint is open. The atlas carries large articulating facets for proatlantes, a pair of which are identifiable in one specimen. These features have not been found previously in a microsaur. All vertebral segments are dominated by a biconcave pleurocentrum; sutures between the pleurocentrum and neural arch are visible in presacral vertebrae. Distinctive microsaurian intercentra occur between all presacral pleurocentra. Their presence reinforces the hypothesis that microsaur intercentra are homologous with those of other early tetrapods. Caudal vertebrae retain separate haemal arches and some have ribs.Observed microsaur synapomorphies include: atlas with large median odontoid; atlas with concave lateral facets for occipital condyle; paired occipital condyles that are broad and concave; and thin, straplike intercentra. No observed features support a sister-group relationship with any other microsaur species, or placement within any higher level microsaur group. Because significant portions of the skeleton are missing or inaccessible, the Goreville microsaur is not formally named. A standardized, hierarchical format for skeletal characters is introduced that facilitates data sharing and comparison and fosters rapid archiving and retrieval.
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Gee, Bryan M., Joseph J. Bevitt, Ulf Garbe, and Robert R. Reisz. "New material of the ‘microsaur’ Llistrofus from the cave deposits of Richards Spur, Oklahoma and the paleoecology of the Hapsidopareiidae." PeerJ 7 (January 25, 2019): e6327. http://dx.doi.org/10.7717/peerj.6327.

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The Hapsidopareiidae is a group of “microsaurs” characterized by a substantial reduction of several elements in the cheek region that results in a prominent, enlarged temporal emargination. The clade comprises two markedly similar taxa from the early Permian of Oklahoma, Hapsidopareion lepton and Llistrofus pricei, which have been suggested to be synonymous by past workers. Llistrofus was previously known solely from the holotype found near Richards Spur, which consists of a dorsoventrally compressed skull in which the internal structures are difficult to characterize. Here, we present data from two new specimens of Llistrofus. This includes data collected through the use of neutron tomography, which revealed important new details of the palate and the neurocranium. Important questions within “Microsauria” related to the evolutionary transformations that likely occurred as part of the acquisition of the highly modified recumbirostran morphology for a fossorial ecology justify detailed reexamination of less well-studied taxa, such as Llistrofus. Although this study eliminates all but one of the previous features that differentiated Llistrofus and Hapsidopareion, the new data and redescription identify new features that justify the maintained separation of the two hapsidopareiids. Llistrofus possesses some of the adaptations for a fossorial lifestyle that have been identified in recumbirostrans but with a lesser degree of modification (e.g., reduced neurocranial ossification and mandibular modification). Incorporating the new data for Llistrofus into an existing phylogenetic matrix maintains the Hapsidopareiidae’s (Llistrofus + Hapsidopareion) position as the sister group to Recumbirostra. Given its phylogenetic position, we contextualize Llistrofus within the broader “microsaur” framework. Specifically, we propose that Llistrofus may have been fossorial but was probably incapable of active burrowing in the fashion of recumbirostrans, which had more consolidated and reinforced skulls. Llistrofus may represent an earlier stage in the step-wise acquisition of the derived recumbirostran morphology and paleoecology, furthering our understanding of the evolutionary history of “microsaurs.”
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Pardo, Jason D., and Arjan Mann. "A basal aïstopod from the earliest Pennsylvanian of Canada, and the antiquity of the first limbless tetrapod lineage." Royal Society Open Science 5, no. 12 (2018): 181056. http://dx.doi.org/10.1098/rsos.181056.

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Earliest Pennsylvanian (Bashkirian) vertebrate fossil assemblages of the Joggins Formation (Cumberland Group) of Nova Scotia, Canada, have long been noted for the unique representation of the earliest known crown amniotes, but the overall vertebrate fauna remains poorly understood. The vast majority of Joggins vertebrates have historically been assigned to the Microsauria, a group originally established by Dawson specifically to accommodate the abundant, diminutive fossils of the Joggins Formation. As the Microsauria concept has evolved, some Joggins taxa (e.g. the eureptile Hylonomus lyelli ) have been removed from the group, but many of the Joggins ‘microsaurs’ remain unrevised, obscuring the true diversity of the earliest Pennsylvanian tetrapod fauna. Here we amend part of this problem by revisiting the morphology of Dawson's ‘microsaur’ Hylerpeton longidentatum . This taxon, represented by the anterior half of a left hemimandible, is here reinterpreted as a plesiomorphic aïstopod and assigned to a new genus, Andersonerpeton . A. longidentatum shows a surprisingly primitive anatomy of the lower jaw, retaining a parasymphyseal fang pair on the dentary, an adsymphyseal bone bearing a denticle field, fangs on all coronoids and parasymphyseal foramina, as well as a prearticular which extends far anterior along the coronoid series. However, several aïstopod characters can also be seen, including a lack of sculpturing on the dentary and a reduced number of recurved, weakly socketed teeth. The anatomy of A. longidentatum corroborates recent phylogenetic work which has placed the origin of aïstopods within the Devonian fin-to-limb transition but preserves a mosaic of characteristics suggesting an even earlier divergence. The presence of an aïstopod in the Joggins fauna expands the taxonomic diversity of the Joggins fauna and suggests that Joggins may preserve a more typical Carboniferous fauna than previously thought.
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Reisz, R. R., and S. P. Modesto. "Archerpeton anthracos from the Joggins Formation of Nova Scotia: a microsaur, not a reptile." Canadian Journal of Earth Sciences 33, no. 5 (1996): 703–9. http://dx.doi.org/10.1139/e96-053.

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New anatomical information, provided by reinterpretation of the pectoral girdle and exposure of previously unprepared portions of the holotype, reveals that the early tetrapod Archerpeton anthracos (Westphalian A of Joggins, Nova Scotia) is a microsaurian lepospondyl, rather than a reptile, as originally described. Archerpeton anthracos is similar to another Joggins microsaur, Asaphestera intermedia, from which it is distinguished by autapomorphies of the appendicular skeleton. The discovery that A. anthracos is a microsaur increases the number of lepospondyls at Joggins to six species and reduces the number of amniotes to two species, Hylonomus lyelli and Protoclepsydrops haplous.
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Zanon, Robert T. "A replacement name for the family Goniorhynchidae Carroll and Gaskill, 1978 (Amphibia: Microsauria)." Journal of Paleontology 62, no. 2 (1988): 317. http://dx.doi.org/10.1017/s0022336000030031.

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Olson (1970) erected the genus Goniorhynchus for a Lower Permian microsaur amphibian from Oklahoma. Carroll and Gaskill (1978) used this genus as the type of a new family, Goniorhynchidae. Schultze and Foreman (1981) noted that the name Goniorhynchus Olson, 1970, was preoccupied by Goniorhynchus Hampson, 1896, and they proposed the replacement name Rhynchonkos; however, they retained the family name as Goniorhynchidae.
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Pardo, Jason D., Matt Szostakiwskyj, and Jason S. Anderson. "Cranial Morphology of the Brachystelechid ‘Microsaur’ Quasicaecilia texana Carroll Provides New Insights into the Diversity and Evolution of Braincase Morphology in Recumbirostran ‘Microsaurs’." PLOS ONE 10, no. 6 (2015): e0130359. http://dx.doi.org/10.1371/journal.pone.0130359.

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Milner, A. R., and S. E. K. Sequeira. "The temnospondyl amphibians from the Viséan of East Kirkton, West Lothian, Scotland." Earth and Environmental Science Transactions of the Royal Society of Edinburgh 84, no. 3-4 (1993): 331–61. http://dx.doi.org/10.1017/s0263593300006155.

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ABSTRACTA new temnospondyl amphibian Balanerpeton woodi gen. et sp. nov. is represented by over 30 complete or partial skeletons from the Viséan limestones, shales and tuffs in East Kirkton Quarry, Bathgate, near Edinburgh, Scotland. It is the commonest tetrapod represented in the East Kirkton assemblage and grew to about half a metre in length. Although superficially like the later Dendrerpeton, it is more advanced in possessing small premaxillaries each bearing a pronounced alary process, large external nares, large rounded interpterygoid vacuities, broadly bordered by the vomers anteriorly, a narrow vomer-pterygoid suture and a rod-like stapes. It is characterised by an unusual dental configuration in which each dentary bears a smaller number of larger teeth than the corresponding upper jaw ramus. A second probable temnospondyl is represented by two straight ribs of a much larger form.The relationships of basal temnospondyls and other amphibian groups are discussed and it is proposed that the sister-group of the temnospondyls is the Microsauria and that neither colosteids nor Caerorhachis can be considered to be temnospondyls, as both fall outside the temnospondyl-microsaur clade. A preliminary study of character distribution across a selection of primitive temnospondyls, including Balanerpeton, suggests that it is more advanced than the long-snouted Edopoidea and the Dendrerpetontidae despite its Viséan age. This implies that by the Viséan, significant diversification of temnospondyls had taken place.
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Carroll, Robert. "Batropetes from the Lower Permian of Europe—a microsaur, not a reptile." Journal of Vertebrate Paleontology 11, no. 2 (1991): 229–42. http://dx.doi.org/10.1080/02724634.1991.10011390.

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Dissertations / Theses on the topic "Microsaur"

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Glienke, Sabine [Verfasser]. "Die Microsauria des mitteleuropäischen Rotliegend / Sabine Glienke." Mainz : Universitätsbibliothek Mainz, 2014. http://d-nb.info/1056926074/34.

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Jackson, Jennifer C. (Jennifer Claire). "Reproduction in dwarf chameleons (Bradypodion) with particular reference to B. pumilum occurring in fire-prone fynbos habitat." Thesis, Stellenbosch : Stellenbosch University, 2007. http://hdl.handle.net/10019.1/21628.

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Dissertation (PhD)--University of Stellenbosch, 2007.<br>ENGLISH ABSTRACT: South Africa, Lesotho and Swaziland are home to an endemic group of dwarf chameleons (Bradypodion). They are small, viviparous, insectivorous, arboreal lizards, found in a variety of vegetation types and climatic conditions. Previous work on Bradypodion pumilum suggests prolonged breeding and high fecundity which is very unusual for a viviparous lizard inhabiting a Mediterranean environment. It has been suggested that the alleged prolonged reproduction observed in B. pumilum may be a reproductive adaptation to life in a fire-prone habitat. In addition, Chamaesaura anguina a viviparous, arboreal grass lizard also occurs in the fire-frequent fynbos and exhibits an aseasonal female reproductive cycle with high clutch sizes; highly unusual for the Cordylidae. With the observation of two species both inhabiting a fire-driven environment and exhibiting aseasonal reproductive cycles with high fecundity, it was thought that this unpredictable environment may shape the reproductive strategies of animals inhabiting it. However, detailed reproductive data for B. pumilum were unavailable. The first aim was provide baseline reproductive data for B. pumilum and to discuss the reproductive strategy in relation to a fire-prone environment. To establish the significance of fire in the reproductive strategy of B. pumilum, reproductive data of other Bradypodion species, not inhabiting the fire-prone area was required. The second aim was to provide baseline reproductive data for Bradypodion with discussion on possible scenarios facilitating the evolution of dwarf chameleon reproduction. Bradypodion pumilum specimens were collected in monthly samples from Stellenbosch and Somerset West in the Western Cape, South Africa. Specimens of other Bradypodion species were obtained from South African museums. Data were collected for both sexes of Bradypodion, and sperm storage ability was investigated in B. pumilum. Bradypodion females all showed an aseasonal reproductive cycle with relatively high clutch sizes for their body size and the possibility of individual females producing multiple clutches per year. Male Bradypodion have sperm available the entire year round however, there appears to be an increase in sperm production in autumn and again in spring in B. pumilum. Elements of this bimodal pattern are seen in other Bradypodion species. Dwarf chameleons regardless of habitat and associated climatic conditions are thus able to reproduce through out the year. It has also been demonstrated in B. pumilum that both sexes are able to store sperm and it is expected that other Bradypodion species would posses this character. This type of reproductive strategy is highly unusual for viviparous, temperate-zone lizards. It is likely that the cooling of the climate due to the development of the Benguela current facilitated the transition to viviparity in Bradypodion. Bradypodion may be aseasonal reproducers for a number of reasons. They are of tropical ancestry, they relatively recently inhabited tropical forests, or fluctuations in climate may have caused this. Bradypodion most likely have a high reproductive output due to their intense vulnerability to predation as in other chameleon species. The proposed hypothesis that the unusual reproductive characteristics of B. pumilum (and possibly the ancestral Bradypodion) were due to inhabiting a fire-prone environment now appears an unlikely explanation. However, even if this extraordinary reproduction was not in direct response to fire, the strategy appears beneficial in this type of unpredictable environment.<br>AFRIKAANSE OPSOMMING: Suid-Afrika, Lesotho en Swaziland huisves ‘n endemiese groep van dwergverkleurmannetjies (Bradypodion). Hulle is klein, lewendbarende, insekvretende, arboreale akkedisse en word gevind in ‘n verskeidenheid van plantegroeitipes en klimaatsomstandighede. Vorige studies op Bradypodion pumilum dui op ‘n verlengde broeiseisoen en hoë fekunditeit, wat ongewoon is vir ‘n lewendbarende akkedis wat in ‘n Mediterreense omgewing voorkom. Daar is voorheen voorgestel dat die skynbare verlengde voortplanting in B. pumilum ‘n aanpassing tot oorlewing in hoogs brandvatbare habitat kan wees. Chamaesaura anguina is ook ‘n lewenbarende, arboreale akkedis wat in fynbos voorkom wat hoogs vatbaar is vir brande en groot werpsels produseer en ‘n aseisoenale voortplantingsiklus in wyfies toon; hierdie patroon is ongewoon vir lede van die Cordylidae. Met die waarneming dat twee species wat in ‘n brandvatbare omgewing voorkom albei aseisoenale voortplantingsiklusse en hoë fekunditeit toon, het die gedagte ontstaan dat hierdie onvoorspelbare omgewing die voortplantingstrategieë van diere wat daarin voorkom, bepaal. Gedetailleerde voortplantingsdata ontbreek egter vir B. pumilum. Die eerste doelstelling van die studie was dus om basisinligting te voorsien oor voortplanting by B. pumilum en om die voortplantingstrategie aan die hand van die brandvatbare omgewing te bespreek. Om die moontlike rol van brand in die vorming van die voortplantingstrategie van B. pumilum te ondersoek, is voortplantingsdata vir ander Bradypodion species wat nie in brandvatbare habitat voorkom nie, nodig. Die tweede doelstelling was dus om basisinligting oor voortplanting by Bradypodion in die breë in te samel, gevolg deur bespreking van moontlike scenarios in die evolusie van voortplanting by dwergverkleurmannetjies. Bradypodion pumilum eksemplare is maandeliks versamel te Stellenbosch en Somerset-wes in die Weskaap, Suid-Afrika. Eksemplare van ander Bradypodion species is vanaf Suid-Afrikaanse museums verky. Data is vir beide geslagte van Bradypodion versamel, en die vermoë tot spermstoring in B. pumilum bepaal. Bradypodion wyfies het almal ‘n aseisonale voortplantingsiklus getoon met relatief hoë werpselgroottes vir hul liggaamsgrootte en daar bestaan die moontlikheid dat individuele wyfies verskeie werpsels per jaar kan lewer. Bradypodion mannetjies produseer sperms dwarsdeur die hele jaar, maar daar blyk tog ‘n toename in spermstoring te wees in die herfs en weer in die lente in B. pumilum. Spore van hierdie bimodale patroon word in ander Bradypodion species gesien. Dwergverkleurmannetjies is dus instaat om dwardeur die jaar voort te plant, ongeag die habitat en geassosieerde klimaatsomstandighede. Daar is getoon dat beide geslagte van B. pumilum sperms kan stoor en daar word verwag dat ander Bradypodion species ook hierdie vermoë het. Hierdie tipe van voortplantingstrategie is ongewoon vir lewendbarende akkedisse van die gematigde sone. Dit is moontlik dat die ontwikkeling van ‘n koue klimaat weens die onstaan van die Benguela-stroom aanleiding gegee het tot die oorskakeling na lewendbarendheid in Bradypodion. Bradypodion mag aseisonale voortplanting toon vir ‘n aantal moontlike redes. Hulle is van tropiese oorsprong, het redelik onlangs tropiese woude betrek, of fluktuasies in klimaat kon ook die oorsaak wees. Bradypodion het waarskynlik hoë voortplantingsuitset omdat hulle besonder kwesbaar is vir predasie, soos dit die geval is by ander verkleurmannetjies. Die aanvanklike hipotese dat die ongewone voortplantingseienskappe van B. pumilum (en moontlik die voorvaderlike Bradypodion) ‘n gevolg is van lewe in ‘n hoogs brandvatbare omgewing, blyk nou ‘n onwaarskynlik te wees. Selfs as hierdie buitengewone voortplantingstrategie nie ‘n direkte gevolg van brandvatbaarheid is nie, blyk die strategie voordelig te wees vir oorlewing in hierdie onvoorspelbare omgewing.
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McDevit, Ryan. "Numerical Study of Disperse Monopropellant Microslug Formation at a Cross Junction." ScholarWorks @ UVM, 2012. http://scholarworks.uvm.edu/graddis/152.

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Two immiscible uids converging at microchannel cross-junction results in the for- mation of periodic, dispersed microslugs. This microslug formation phenomenon has been proposed as the basis for a fuel injection system in a novel, discrete mono- propellant microthruster design for use in next-generation nanosatellites. Previous experimental work has demonstrated the ability to repeatably generate fuel slugs with characteristics commensurate with the intended application. In this work, numerical modeling and simulation are used to further study this problem, and identify the sensitivity of the slug characteristics to key material properties including surface ten- sion, contact angle and fuel viscosity. These concerns are of practical concern for this application due to the potential for thermal variations and/or uid contamination during typical operation. For each of these properties, regions exist where the slug characteristics are essentially insensitive to property variations. Future microthruster system designs should target and incorporate these stable ow regions in their baseline operating conditions to maximize robustness of operation.
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Kumar, Y. Ashok, T. J. Aprem, and M. Nadar. "MULTI FUNCTION RF MODULE." International Foundation for Telemetering, 1996. http://hdl.handle.net/10150/608380.

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International Telemetering Conference Proceedings / October 28-31, 1996 / Town and Country Hotel and Convention Center, San Diego, California<br>Generally, to meet the Telemetry and Tracking functions in space probes, RF packages are realised using dedicated circuit configurations and different building blocks. While this approach is warranted for certain Space missions, for some Space programmes, which are basically Technology demonstrators and where the main emphasis is on higher flexibility with minimal complexity - usage of multifunction RF modules (MFRM), would be highly avantageous. The MFRM, which can be considered as a RF package, has a flexible configuration and is built around Common basic building blocks like broadband MMIC, wide band amplifiers, switches, Dielectric Resonant Oscillators (DRO), Numerically Controlled Oscillators (NCO), etc. It also has a Microcontroller, whose function is to select the required configuration and make necessary interconnections between the building blocks, so as to achieve a specific end function, based on the pre set commands from system designer. The commands can either be preprogrammed or they can be through uplink Telecommand signals from the ground stations. A brief outline of the results of the proto unit of a MFRM which can be configured for different end RF functions, through a microcontroller is presented in the paper. It is expected that in Space missions like LEO programmes, Microsats, Reentry, Microgravity experiments etc, the MFRM approach would offer greater flexibility to the system designer at reduced-cost, complexity and production turn around time.
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Smith, Sheryl Dianna. "The Influence of Water Quality on Arsenic Sorption and Treatment Process Performance." Thesis, Virginia Tech, 2001. http://hdl.handle.net/10919/33581.

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A new regulation has been proposed that would lower the acceptable level of arsenic in drinking water from the current standard of 50 ppb. Therefore, research into effective arsenic removal treatment is important, especially for hard to treat waters with high concentrations of silica. The first phase of research was designed to determine if sand ballasted coagulation is a viable means of removing arsenic from drinking water, and if so, to identify the water qualities in which the technology performs best. A jar test protocol was developed and tested on a wide range of waters to compare microsand ballasted coagulation and other coagulation based treatment processes in terms of arsenic removal. Secondary impacts of the microsand process such as residual turbidity, iron, post-treatment membrane filter run length, and TOC removal were also considered as part of this evaluation. Microsand ballasted coagulation provided promising results for many of the simulated groundwater test conditions in which more than 80% of the arsenic regulation costs will be incurred. However, like conventional coagulation/sedimentation, microsand ballasted coagulation performed poorly in waters with high silica and high pH. Thereafter, a second phase of research more closely examined the kinetic behavior of arsenic sorption to amorphous and granular oxides in the presence of silica and calcium. At pH 8.5, calcium dramatically improved arsenic sorption to amorphous iron hydroxide in the presence of silica over short reaction times, but had no long-term advantage. This result could have considerable applications for treatment in that it suggests water quality controls the required reaction times. Additionally, batch tests indicated that activated alumina granular media was more sensitive to water quality than granular ferric hydroxide; however, calcium eliminated silica interference to arsenic sorption onto activated alumina.<br>Master of Science
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SUH, JUNWOO. "THE DYNAMIC CHARACTERISTICS OF A LIQUID-GAS INTERFACE IN MICROSCALE PORES." University of Cincinnati / OhioLINK, 2002. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1037384143.

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Grubbs, Garry Smith II. "Investigating Molecular Structures: Rapidly Examining Molecular Fingerprints Through Fast Passage Broadband Fourier Transform Microwave Spectroscopy." Thesis, University of North Texas, 2011. https://digital.library.unt.edu/ark:/67531/metadc67988/.

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Microwave spectroscopy is a gas phase technique typically geared toward measuring the rotational transitions of Molecules. The information contained in this type of spectroscopy pertains to a molecules structure, both geometric and electronic, which give insight into a molecule's chemistry. Typically this type of spectroscopy is high resolution, but narrowband ≤1 MHz in frequency. This is achieved by tuning a cavity, exciting a molecule with electromagnetic radiation in the microwave region, turning the electromagnetic radiation o, and measuring a signal from the molecular relaxation in the form of a free induction decay (FID). The FID is then Fourier transformed to give a frequency of the transition. "Fast passage" is defined as a sweeping of frequencies through a transition at a time much shorter (≤10 s) than the molecular relaxation (≈100 s). Recent advancements in technology have allowed for the creation of these fast frequency sweeps, known as "chirps", which allow for broadband capabilities. This work presents the design, construction, and implementation of one such novel, high-resolution microwave spectrometer with broadband capabilities. The manuscript also provides the theory, technique, and motivations behind building of such an instrument. In this manuscript it is demonstrated that, although a gas phase technique, solids, liquids, and transient species may be studied with the spectrometer with high sensitivity, making it a viable option for many molecules wanting to be rotationally studied. The spectrometer has a relative correct intensity feature that, when coupled with theory, may ease the difficulty in transition assignment and facilitate dynamic chemical studies of the experiment. Molecules studied on this spectrometer have, in turn, been analyzed and assigned using common rotational spectroscopic analysis. Detailed theory on the analysis of these molecules has been provided. Structural parameters such as rotational constants and centrifugal distortion constants have been determined and reported for most molecules in the document. Where possible, comparisons have been made amongst groups of similar molecules to try and get insight into the nature of the bonds those molecules are forming. This has been achieved the the comparisons of nuclear electric quadrupole and nuclear magnetic coupling constants, and the results therein have been determined and reported.
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Fonseca, Aline Simoneti. "Diversidade genética em agregações de Nannotrigona testaceicornis Cockerell, 1922 (Hymenoptera, Apidae, Meliponini) através de marcadores microssatélites." Universidade de São Paulo, 2010. http://www.teses.usp.br/teses/disponiveis/17/17135/tde-25052011-165551/.

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As abelhas são insetos da ordem Hymenoptera e taxonomicamente estão reunidas na superfamília Apoidea. Os Meliponini, da subfamília Apinae, são popularmente chamados abelhas indígenas sem ferrão e algumas espécies são essenciais para a polinização de plantas selvagens e lavouras. As abelhas Nannotrigona testaceicornis, utilizadas neste trabalho, são pequenas, possuem o tórax marrom escuro e opaco e não são agressivas. No Brasil, elas são encontradas na Bahia, Espírito Santo, Goiás, Minas Gerais, Rio de Janeiro e São Paulo. Assim como muitas espécies de Hymenoptera, elas também podem nidificar em agregações e analisar a variabilidade genética dentro e entre os agregados foi um dos objetivos deste trabalho, além de avaliar os prováveis múltiplos acasalamentos que parecem ocorrer dentro dessa espécie de meliponíneos. Para tanto, foram coletados indivíduos de ninhos de N. testaceicornis no Campus da USP de Ribeirão Preto (SP), Campinas (SP), Bonfim Paulista (SP), Uberlândia (MG) e Caratinga (MG). 302 indivíduos (operárias) de um total de 32 ninhos foram macerados e tiveram seu DNA extraído. Foram utilizados oito loci microssatélites específicos para o estudo da variabilidade genética e múltiplos acasalamentos. Um total de 38 alelos foi observado. A diversidade genética média entre as agregações foi de 35,4%, a heterozigose média esperada foi de 41,4% e a observada foi de 28,3%. O coeficiente de endogamia (Fis) foi estatisticamente significativo para todas as agregações. Também foram observados desvios no equilíbrio de Hardy-Weinberg para todos os loci analisados. A análise do Fst mostrou diferenciação entre as agregações, porém, apesar da indicação pelo AMOVA de uma discreta estruturação entre as agregações, não foi possível agrupá-las. A partir dos dados obtidos foi possível observar que a diversidade genética nestas agregações está baixa, além disso, os desvios do equilíbrio, o valor significativo do Fis, e a heterozigose observada menor do que a esperada em todos os loci demonstrou a ocorrência de cruzamentos endogâmicos resultando em alto nível de homozigose nesta população. Com relação aos múltiplos acasalamentos, dos 32 ninhos estudados, somente 11 (34,4%) apresentaram uma patrilínea. A presença de alelos nulos, a inclusão acidental de machos na amostra, mudanças recentes de rainhas, operárias de outros ninhos e a contínua conexão entre ninho mãe-filho podem ser possibilidades para estes resultados, entretanto, a frequência de mais de uma patrilínea é muito alta para que a poliandria não seja considerada.<br>Bees are insects belonging to the Hymenoptera order and to the Apoidea superfamily. The Meliponini, from the subfamily Apinae, are popularly known as stingless bees and some species are essential to the pollination of wild and farming plants. Nannotrigona testaceicornis, studied in this work, are small bees presenting a dark brown and opaque thorax, and non-aggressive behavior. In Brazil, they are found at Bahia, Espírito Santo, Goiás, Minas Gerais, Rio de Janeiro and São Paulo states. As well as many other Hymenoptera species, they can nest on aggregations. To analyze the genetic variability within and among the aggregates was one of the objectives of this work, besides to evaluate the possibility of multiple matings which seem to occur in this species. For this purpose, samples of N. testaceicornis were collected from nests found at University of São Paulo Campus at Ribeirão Preto (SP), Campinas (SP), Bonfim Paulista (SP), Uberlândia (MG) and Caratinga (MG). Three hundred and two individuals (workers) from thirty-two sampled nests had their DNA extracted. Eight specific microsatellite loci were used to study the genetic variability and multiple matings. A total of thirty-eight alleles were observed. The mean genetic diversity among the aggregations was 35.4%, the mean expected heterozygosity was 41.4% and the observed was 28.3%. The inbreeding coefficient (Fis) was statistically significant for all the aggregations. Deviations from Hardy-Weinberg Equilibrium were observed in all studied loci. The Fst analysis showed differentiation among the aggregations but, despite the AMOVA indication of structuring among them, it was not possible to group them. From the obtained data we observed that the genetic diversity of the aggregations is low. The significant Fis value and the observed heterozygosity lower than the expected one in all the studied loci, demonstrated inbreeding events resulting in a high level of homozygosis in this population. In relation to the possibility of multiple mating, from the 32 studied nests, only 11 (34.4%) presented one patriline. The presence of null alleles, the accidental inclusion of males in the sample, recent queen changes, workers drifting among nests, continuing connections between mother and daughter nests or multiple matings might be possibilities for these results. However, the frequency of more than one patriline is very high to not consider the polyandry.
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Techer, Maéva Angélique. "Diversité génétique et phylogéographie de l'abeille Apis mellifera dans les îles du sud-ouest de l'océan Indien." Thesis, La Réunion, 2015. http://www.theses.fr/2015LARE0033/document.

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Les îles du Sud-Ouest de l'océan Indien (SOOI) abritent une faune et une flore exceptionnelle et constituent l'un des cinq hotspot de biodiversité les plus importants au monde. L'abeille domestique Apis mellifera occupe divers habitats dans la majorité de ces îles et interagit avec une flore indigène et endémique. Elle est également exploitée par l'Homme pour l'apiculture. A. mellifera a divergé en plusieurs lignées évolutives et sous-espèces dans son aire d'origine. Parmi-elles, A. m. unicolor a été décrite comme endémique de Madagascar et appartient à la lignée africaine A. Les objectifs de cette thèse étaient de caractériser l'abeille dans les archipels des Mascareignes, Comores et Seychelles en identifiant les lignées évolutives et sous-espèces présentes avec des marqueurs mitochondriaux (région intergénique COI-COII, gène ND2). Dans un second temps, une étude de la diversité et de la structure génétique a été réalisée sur ces mêmes populations insulaires (15 microsatellites). Un total de 4095 colonies ont été échantillonnées dans le SOOI et 238 dans l'aire naturelle continentale. Trois des quatre lignées évolutives (A, C et M) ont été détectées dans les 10 îles étudiées et ce en différentes proportions. La lignée africaine A et A. m. unicolor sont prépondérantes dans le SOOI excepté à Rodrigues (100% lignée européenne C). Dans toutes les îles de l'archipel des Comores et des Seychelles, 100% des colonies échantillonnées appartiennent à la lignée A, 95,2% à La Réunion et seulement 54,2% à Maurice. Les îles de l'archipel des Comores constitueraient une zone de contact entre la lignée africaine continentale et les populations d'A. m. unicolor. La diversité génétique nucléaire est forte dans les archipels du SOOI et est structurée par îles et archipels. En outre, les populations du SOOI se différencient fortement des populations continentales africaines et européennes. La combinaison des différents marqueurs privilégie l'hypothèse d'une colonisation ancienne et naturelle d'A. m. unicolor depuis Madagascar à La Réunion, Maurice et aux Seychelles<br>The South West Indian Ocean (SWIO) islands are home to an exceptional flora and fauna and are considered as one the five most important biodiversity hotspots in the world. In most islands of this region, the honeybee Apis mellifera occupies diverse habitats. Regarding its ability as a generalist pollinator, honeybee interacts with native and highly endemic flora. Furthermore, this species is used by human for beekeeping as it is able to produce honey, pollen and other hive products. Within the large group of bees (Apidae), A. mellifera is a model of diversity that has diverged into several lineages and subspecies in its native range. Among the 28 recognized subspecies, A. m. unicolor has been described as endemic to Madagascar and belongs to the African A lineage. The Mascarenes, Comoros and Seychelles archipelagos surround this continental island but the A. mellifera populations present have been little or never studied. The aims of this thesis were to characterize the honeybee from the Mascarenes (La Réunion, Mauritius, Rodrigues), Comoros (Anjouan, Mohéli, Grande Comore, Mayotte) and Seychelles (Mahé, Praslin, La Digue) archipelagos by determining the evolutionary lineages and subspecies present. Secondly, a study of genetic diversity and structure were conducted on these same insular populations. For that, a large sampling was carried (n = 4095 colonies from the SWIO, and 238 from native continental areas) and was combined to molecular analyzes using mitochondrial markers (sequencing of the COI-COII intergenic region and ND2 gene) and nuclear markers (15 microsatellite loci). Three of the four evolutionary lineages (A, C and M) were detected in different proportions in the 10 studied islands. The African A lineage and A. m. unicolor subspecies were predominant in the SWIO excepted for Rodrigues exclusively from the European C lineage. All sampled colonies from the Seychelles and Comoros archipelagos belong to the African lineage while in La Réunion the proportion reach 95.2% and only 54.2% in Mauritius. The presence of the Z African sub-lineage has been described for the first time out of Africa in two Seychelles islands. Moreover, Comoros islands may constitute a contact area between the continental African lineage and A. m. unicolor populations (insular African lineage). The SWIO populations show high levels of nuclear genetic diversity and a structuration by island and archipelago. In addition, SWIO populations strongly differentiated from African and European continental populations. The combined results from different molecular markers favor the hypothesis of an ancient and natural colonization from Madagascar to La Réunion, Mauritius and Seychelles islands. Therefore, the previous referenced interactions between the honeybee and the endemic fauna and flora in the SWIO might be explained by a long cohabitation in addition to its generalist pollinator ability
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Olori, Jennifer Catherine. "The evolution of skeletal development in early tetrapods : anatomy and ontogeny of microsaurs (Lepospondyli)." Thesis, 2011. http://hdl.handle.net/2152/ETD-UT-2011-05-3535.

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Because the ancestry of extant amphibians remains highly controversial, under traditional perspectives, amphibians and amniotes often are distinguished by differences in developmental mode rather than their evolutionary relationships. Resolution of relationships is important, however, because phylogeny affects interpretations of biology, including the evolution of development. To address those issues, I documented the growth and development of two extinct lepospondyls, Microbrachis pelikani and Hyloplesion longicostatum, and compared the patterns in those taxa to data from other tetrapods. I quantified allometry in the skeleton using both measurement-based and geometric morphometric analyses. I applied Ontogenetic Sequence Analysis (OSA), a size-independent method, to the reconstruction of ossification sequences based on fossils. I also documented skeletal morphogenesis and used Parsimov Analysis and Parsimov-based Genetic Inference of ossification sequence data to evaluate the three hypotheses of extant amphibian ancestry, the Lepospondyl (LH), Temnospondyl (TH), and Polyphyletic (PH) hypotheses. Skeletal growth in Microbrachis pelikani and Hyloplesion longicostatum is primarily isometric. Comparisons with data from other Paleozoic taxa suggest that isometry was the ancestral pattern of growth in tetrapods. All regression analyses had a linear fit indicating lack of an abrupt metamorphosis. Absence of metamorphosis is also supported by the possession of lateral lines in both taxa throughout ontogeny, and Microbrachis pelikani additionally retained gills. However, ossification of the skeleton was completed at small body size. The greatest resolution in ossification sequence reconstruction was achieved with OSA, but results from all reconstruction methods indicated advanced ossification of the pubis and delayed ossification of the scapula in the lepospondyls. In terms of total number of sequence shifts optimized across each hypothesis of amphibian relationships, the TH had the shortest tree length. However, the values for the three hypotheses did not differ significantly, demonstrating that none was supported strongly. Based on my synthesis of new developmental data, I propose that Microbrachis pelikani and Hyloplesion longicostatum expressed a mosaic pattern of skeletal development. That pattern included a gradual transition to an adult morphology, and a lack of an amphibian-like metamorphosis. A similar pattern is common to most early tetrapods and Eusthenopteron, supporting the hypothesis that metamorphosis is not ancestral for Tetrapoda.<br>text
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Books on the topic "Microsaur"

1

Kenya, FSD, ed. Microsave: Project completion report. FSD Kenya, 2008.

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Hitchins, Rob. Microsave: Project completion report. FSD Kenya, 2008.

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Rubin, Charles. Microsafe works on the Apple Macintosh. Microsofe, 1986.

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Levine, David M. Statistics for managers using Microsofr Excel. 2nd ed. Prentice-Hall, 1999.

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Valdes, James R. Status report on MicroSat data telemtery. Woods Hole Oceanographic Institution, 1992.

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Hughes, Geoffrey V. The Orbital Express project of Bristol Aerospace and MicroSat Launch Systems, Inc. AIAA, 1996.

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ESA International Conference on Spacecraft Guidance, Navigation, and Control Systems (3rd 1996 Noordwijk, Netherlands). 3rd ESA International Conference on Spacecraft Guidance, Navigation, and Control Systems: And tutorial on microsats, design, development and execution of minimum missions, 26-29 November 1996, ESTEC, Noordwijk, The Netherlands. European Space Agency Publications Division, 1997.

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Microsaurs: Tiny-Tricera Troubles. Feiwel & Friends, 2019.

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Hansen, Dustin. Microsaurs: Beware the Tiny-Spino. Feiwel & Friends, 2019.

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Hansen, Dustin. Microsaurs: That's MY Tiny-Saurus Rex. Square Fish, 2019.

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Book chapters on the topic "Microsaur"

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Winship, Guy. "Conclusion; About Microsave." In Conversations with Practitioners. Practical Action Publishing, 2007. http://dx.doi.org/10.3362/9781780440743.011.

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Guibelin, E., F. Delsalle, and P. Binot. "High Speed Settling of Stormwater with Microsand." In Chemical Water and Wastewater Treatment III. Springer Berlin Heidelberg, 1994. http://dx.doi.org/10.1007/978-3-642-79110-9_23.

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Sucheta, K. H., B. R. Uma, and R. NukaRaju. "Microsat: Solar Array Exposed Materials Protection from Atomic Oxygen." In Lecture Notes in Mechanical Engineering. Springer Singapore, 2020. http://dx.doi.org/10.1007/978-981-15-1724-2_31.

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Veldman, S. M., and K. Lundahl. "Atmospheric Climate Experiment ACE a Constellation of Microsats for Atmospheric Sounding." In Smaller Satellites: Bigger Business? Springer Netherlands, 2002. http://dx.doi.org/10.1007/978-94-017-3008-2_63.

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Eriksson, H., R. Salmonsson, G. Liljeqvist, and E. Heilbronn. "Studies on a cAMP-Dependent Protein Kinase Obtained from Nicotinic Receptor-Bearing Microsacs." In Advances in Behavioral Biology. Springer US, 1986. http://dx.doi.org/10.1007/978-1-4684-5194-8_90.

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Zhang, Cui, Rob Shaw, Ronald A. Olsson, et al. "Mechanizing a programming logic for the concurrent programming language microSR in HOL." In Higher Order Logic Theorem Proving and Its Applications. Springer Berlin Heidelberg, 1994. http://dx.doi.org/10.1007/3-540-57826-9_123.

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Matsumura, Yusuke, and T. Iwata. "Advanced Microsat Technology." In COSPAR Colloquia Series. Elsevier, 1999. http://dx.doi.org/10.1016/s0964-2749(99)80017-1.

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Conference papers on the topic "Microsaur"

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Wheeler, Robert, Robert Saunders, Kelli Pickett, et al. "Design of a Reconfigurable SMA-Based Solar Array Deployment Mechanism." In ASME 2015 Conference on Smart Materials, Adaptive Structures and Intelligent Systems. American Society of Mechanical Engineers, 2015. http://dx.doi.org/10.1115/smasis2015-9040.

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Shape memory alloys (SMAs), are a class of metals that possess the capability to recover substantial deformations resulting from applied mechanical loads through a solid-solid phase transformation. Typical deployment systems for solar arrays on microsats only allow for one-way deployment. However, by using an SMA actuator in place of a conventional deployment system, repeatable deployment and retraction can be achieved. Relative to conventional actuators, SMA-based solid state actuators offer a reduction in the weight, volume, and overall complexity of the system. In this study, a design of an SMA-based solar panel deployment mechanism for a typical microsat is presented. In this design, a conventional actuation system is replaced with a system of SMA torsional actuators, which allows for a deployed and stowed phase to be reached independent of environmental conditions. This design study illustrates that an SMA-based solar array deployment system can provide a viable replacement for a conventional deployment system while significantly reducing the deployment system weight, volume, and complexity.
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McDevitt, M. Ryan, Darren L. Hitt, and Justin W. McCabe. "Numerical Study of Disperse, Multiphase Microslug Formation at a Microchannel Junction." In ASME 2010 8th International Conference on Nanochannels, Microchannels, and Minichannels collocated with 3rd Joint US-European Fluids Engineering Summer Meeting. ASMEDC, 2010. http://dx.doi.org/10.1115/fedsm-icnmm2010-30999.

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In this study, we use numerical methods to examine microslug formation via converging flows of a liquid propellant and inert gas at a 4-way 90° microchannel junction. The primary goal of this study is to characterize microslug formation in a microchannel using the level set method to model the multiphase flow. The significance of this work lies in the utilization of the microslug formation phenomena as the basis for a fuel injection system in a novel, discrete monopropellant microthruster design for use in next-generation nano-satellites.
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Raffaelle, R., P. Jenkins, D. Scheiman, et al. "Microsat power supplies." In 40th AIAA Aerospace Sciences Meeting & Exhibit. American Institute of Aeronautics and Astronautics, 2002. http://dx.doi.org/10.2514/6.2002-719.

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Jambusaria, M. H., A. A. Burkic, M. J. Ellis, J. Dominguez, and C. S. Kirkconnell. "Microsat cryocooler system." In SPIE Defense + Security, edited by Bjørn F. Andresen, Gabor F. Fulop, Charles M. Hanson, and Paul R. Norton. SPIE, 2015. http://dx.doi.org/10.1117/12.2179321.

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Murugan, G. S., S. Bakhtiari-Gorajoobi, C. A. Codemard, et al. "Optical microstub resonator lasers." In SPIE LASE, edited by Alexis V. Kudryashov, Alan H. Paxton, Vladimir S. Ilchenko, Lutz Aschke, and Kunihiko Washio. SPIE, 2014. http://dx.doi.org/10.1117/12.2039672.

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Smith, Jay L., and Randall Liefer. "Exploring space with a microsat: where no microsat has gone before." In Optical Engineering and Photonics in Aerospace Sensing, edited by Brian J. Horais. SPIE, 1993. http://dx.doi.org/10.1117/12.156634.

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James, P. "A wideband microstrip patch array for a MicroSAR." In Twelfth International Conference on Antennas and Propagation (ICAP 2003). IEE, 2003. http://dx.doi.org/10.1049/cp:20030174.

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Ruf, Christofer S., Clara Chew, Darren McKague, Shakeel Asharaf, and Mahta Moghaddam. "The NASA CYGNSS microsat constellation." In CubeSats and SmallSats for Remote Sensing IV, edited by Charles D. Norton, Thomas S. Pagano, and Sachidananda R. Babu. SPIE, 2020. http://dx.doi.org/10.1117/12.2570153.

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Cunningham, Andrew, and Robert Legge. "Overview of the Agile Microsat." In 2021 IEEE Aerospace Conference. IEEE, 2021. http://dx.doi.org/10.1109/aero50100.2021.9438209.

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Kare, Jordin T. "Interstellar precursor missions using microsail beams." In SPACE TECHNOLOGY AND APPLICATIONS INTERNATIONAL FORUM- STAIF 2002. AIP, 2002. http://dx.doi.org/10.1063/1.1449740.

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Reports on the topic "Microsaur"

1

Chapman, R. J., and Joseph A. Hauser. Ocean Data Telemetry Microsat Link (ODTML). Defense Technical Information Center, 2008. http://dx.doi.org/10.21236/ada533972.

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Valdes, James R. Status Report on MicroSat Data Telemetry. Defense Technical Information Center, 1992. http://dx.doi.org/10.21236/ada257468.

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Chapman, R. J., and Joseph A. Hauser. Ocean Data Telemetry Microsat Link (ODTML). Defense Technical Information Center, 2007. http://dx.doi.org/10.21236/ada573093.

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Chapman, R. J., and Joseph A. Hauser. Ocean Data Telemetry Microsat Link (ODTML). Defense Technical Information Center, 2006. http://dx.doi.org/10.21236/ada630982.

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Burton, Rodney L. Pulsed Electric Microthrusters With Solid Propellant for Microsats and Nanosats. Defense Technical Information Center, 2002. http://dx.doi.org/10.21236/ada401337.

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Hitt, Darren L., and Walter J. Varhue. DEPSCOR06: A Dispersed Monopropellant Microslug Approach for Discrete Satellite Micropropulsion. Defense Technical Information Center, 2010. http://dx.doi.org/10.21236/ada564650.

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Rathbun, W. From chaos to order: The MicroStar data acquisition and analysis system. Office of Scientific and Technical Information (OSTI), 1991. http://dx.doi.org/10.2172/5147502.

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