Eastern South America, or what is today Brazilian territory, poses interesting questions about the early human occupation of the Americas. Three totally distinct and contemporaneous lithic technologies, dated between 11,000 and 10,000 14C BP, are present in different portions of the country: the Umbu tradition in the south, with its formal bifacial industry, with well-retouched scrapers and bif...

In the unusual aquatic Podostemaceae, the root is the leading organ of the plant body and is variously compressed and submerged as it adheres to rock surfaces in rapid water. In an anatomical comparison of the root apical meristems and root caps of 33 species that represent the major lineages of the family, the dorsiventrality of root meristems varied and was classified into four patterns: (1) ...

Reducing wafer thickness provides the most effective potential to lower the production cost of c-Si PV modules. Two thin n-type solar cell concepts are compared in terms of their optical and electrical properties: a monofacial device with a full-area metal surface at the rear which is beneficial in particular to such thin solar cells and a very similar but even better industrially applicable bi...

Reproductive boll weevil populations are typically identified by the presence of a frass seal and protuberance at the oviposition site in cotton squares. However, despite the occurrence of other oviposition puncture seal types and their use in previous fecundity studies, the relationship of these respective puncture seal types and oviposition has not been clearly examined. In this study, newly ...

In this paper, we present a new technic based on t transient diffusion capacitance of the bifacial solar cell back surface recombination velocity (Sb) and the grain boundary recombination velocity (Sgb), we resolved the continuity equation in the base of the solar cell under monochro diffusion capacitance profile which decreases with the dynamic junction velocity (Sf), the back surface recombin...

Background.The paraesophageal hiatus hernias (PHH) are relatively uncommon, but an increased incidence has been reported and they now account for 5-10% of all hiatus hernias. The surgical treatment is recommended for all the patients with this pathology because of high risk of complications: obstruction, incarceration, strangulation or perforation. The use of prostheses is recommended in the pr...

Many types of noise can be present in an image. Registration becomes difficult when the concerned pattern contains a “seal noise.” In this paper, the seal noise appearing inherently in a seal image is introduced. The registration of seal images used widely in many commercial applications in Chinese society is presented. An effective approach using contour analysis for finding the principal orie...

background: main objective of this study was to investigate the invasive activity of the liver fluke, pseudamphistomom truncatum against the caspian seal ( pusa caspica ) and was exemplified at the gross, light microscopy (lm) and electron microscopy (em) levels. methods: the study was done on a freshly dead caspian seal in the southern coast of caspian sea. the checked caspian seal probably be...

introdouction: it is important for the clinician to be aware regarding the necessary thickness of materials used as intra-orifice coronal barriers to prevent microleakage. the purpose of this in vitro study was to compare coronal microleakage of three different thicknesses of white and gray angelus mineral trioxide aggregate (wamta, gamta). materials and methods: a total of 66 canals of extract...