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Only Leaves (only + leaf)
Selected AbstractsManus-only titanosaurid trackway from Fumanya (Maastrichtian, Pyrenees): further evidence for an underprint originLETHAIA, Issue 3 2005BERNAT VILA The origin of manus-only and manus dominated sauropod trackways has been a matter of intense debate since two hyphothesis exist: (a) manus-only and manus-dominated trackways result from a ,swimming' sauropod, and (b) they result from a selective underprint phenomenon that only leaves the manus recorded. Several new sauropod trackways are reported in the Fumanya tracksite area (Maastrichtian), in SE Pyrenees, where both tracks and undertracks are found on the same stratigraphic bedding surface. In one of the trackways, footprint morphology together with the trackway pattern displays a clear succession of manus-only impressions attributed to a sauropod dinosaur in a walking gait. The ichnological comparison between the manus-only trackway with the other complete trackway (manus-pes) display an identical distribution of the manus pattern. This fact clearly points towards an underprint phenomenon as the origin for manus-only trackways, since it is rather unlikely that the same pattern would completely match different locomotion behaviours such as walking and swimming. Therefore, we suggest an interpretation based on the differential loading between the hindfoot and the forefoot on an upper stratigraphic track-level, for the studied manus-only trackway. , Fumanya tracksite, manus-only trackways, titanosaurs, trackway pattern, underprint, Upper Cretaceous. [source] Emerging Christian Scholars among the Intellectual Virtues or Why They All Should Be ThomistsNEW BLACKFRIARS, Issue 1020 2008Todd C. Ream Abstract The reason why all of our students should be Thomists is that excellence among the intellectual virtues is what should come to define our aspirations for them as emerging Christian scholars. Such aspirations are formed by the design and implementation of practices of study. Such aspirations denounce any distinction between subject and object or finite and infinite. However, such aspirations are also guided by the narrative of excellence as defined by the beatific vision of God. Thomas Aquinas reminds us that this narrative is not one the academy generates on its own but is the story of Christianity as embodied by the Church. Failure to recognize such a narrative and design practices of study accordingly not only leaves our students beyond the formative influence of the intellectual virtues but also leaves them susceptible to the influences wielded by other narratives such as the narrative of the market economy. [source] Genetic modification of the fatty acid unsaturation of phosphatidylglycerol in chloroplasts alters the sensitivity of tobacco plants to cold stressPLANT CELL & ENVIRONMENT, Issue 1 2004A. SAKAMOTO ABSTRACT The cis -unsaturated molecular species of phosphatidylglycerol (PG) in chloroplasts have been implicated in the chilling sensitivity of plants. Homozygous lines of transgenic tobacco (Nicotiana tabacum) that overexpressed the cDNA for glycerol-3-phosphate acyltransferase, a key enzyme in the determination of the extent of cis -unsaturation of PG, were established from a chilling-sensitive squash (Cucurbita moschata). In transgenic plants, the proportion of saturated plus trans -monounsaturated molecular species of PG increased from 24 to 65%. However, this change did not affect the architecture of the chloroplasts. Chilling stress decreased the growth and biomass production of young seedlings of transgenic plants more severely than those of wild-type plants, and this observation suggests that the changes in the proportion of cis -unsaturated PG affected not only leaves but also developing plants. Chilling stress also damaged inflorescences. In particular, the abscission of flower buds and inflorescence meristems from transgenic plants occurred more frequently than that from wild-type plants. Thus, it is likely that decreases in the proportion of cis -unsaturated PG enhanced the sensitivity to chilling of reproductive organs. [source] Brief communication: Minimally invasive bone sampling method for DNA analysisAMERICAN JOURNAL OF PHYSICAL ANTHROPOLOGY, Issue 4 2009Victoria E. Gibbon Abstract Obtaining a bone sample for DNA analysis has traditionally been a destructive practice, which has resulted in reluctance on behalf of curators for skeletal collections to allow invasive testing. A novel minimally invasive bone sampling method for DNA analysis is presented here. This method uses a conventional hand drill wherein the bone sample is extracted from the intercondylar fossa of the femur; it does not interfere with any known anthropometric landmarks and only leaves a small hole on the surface of the bone. The temperature of the drill is documented and it was established due to the minor increase in temperature, that this should not affect the molecular integrity of the sample. This method is easily replicated and is suitable for both human and other animal skeletal material and can be applied to rare specimens with little risk. Am J Phys Anthropol, 2009. © 2009 Wiley-Liss, Inc. [source] | ||||||||||