David L. Lentz

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Archaeological research in the Gulf Coast of Tabasco reveals the earliest record of maize cultivation in Mexico. The first farmers settled along beach ridges and lagoons of the Grijalva River delta. Pollen from cultivated Zea appears with evidence of forest clearing about 5100 calendar years B.C. (yr B.C.) [6200 (14)C years before the present (yr B.P.)].(More)
The reasons for the development and collapse of Maya civilization remain controversial and historical events carved on stone monuments throughout this region provide a remarkable source of data about the rise and fall of these complex polities. Use of these records depends on correlating the Maya and European calendars so that they can be compared with(More)
Archaeological investigations at Cerén, a well–preserved Classic period Maya site in El Salvador, have recovered an abundance of carbonized bean remains, both Phaseolus vulgaris and P. lunatus. Surprisingly, the Cerén P. vulgaris bean remains were derived from both wild and domesticated populations. This find reveals that the Late Classic inhabitants(More)
Manilkara zapota is a tropical tree species that was used by the ancient Maya in construction of their temples and as a source for fruit. Although this has been supported by ethnographic and paleoethnobotanical data, we used genetic approaches to estimate variation and structure in modern populations of this neotropical tree species to discern if genetic(More)
The results from three separate examinations using SEM photomicrographs and shape factor (SF) measurements show that Oral-B P-35 brushes have a highly significant difference in bristle end-rounding when compared to Colgate Precision and Crest Complete toothbrushes. The proportion of Oral-B P-35 bristles with highly rounded ends was substantially greater(More)
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