David L. Lentz

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Eastern North America is one of at least six regions of the world where agriculture is thought to have arisen wholly independently. The primary evidence for this hypothesis derives from morphological changes in the archaeobotanical record of three important crops--squash, goosefoot and sunflower--as well as an extinct minor cultigen, sumpweed. However, the(More)
Phylogenetic analyses of genes with demonstrated involvement in evolutionary transitions can be an important means of resolving conflicting hypotheses about evolutionary history or process. In sunflower, two genes have previously been shown to have experienced selective sweeps during its early domestication. In the present study, we identified a third(More)
Mexico has long been recognized as one of the world's cradles of domestication with evidence for squash (Cucurbita pepo) cultivation appearing as early as 8,000 cal B.C. followed by many other plants, such as maize (Zea mays), peppers (Capsicum annuum), common beans (Phaseolus vulgaris), and cotton (Gossypium hirsutum). We present archaeological,(More)
Five dichlorinated 8-quinolinols (2,5- 5,6-, 3,5-, 3,7-, and 4,5-dichloro-8-quinolinol) were tested against Candida albicans and C. Tropicalis in Sabouraud dextrosebroth with and without bovine serum. The 5,6-, 3,5-, and 3,7-dichloro-8-quinolinols proved to be more effective than the control, 5-fluorocytosine. In cytotoxicity tests employing baby hamster(More)
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 New York Botanical Garden initiated its Graduate Studies Program through a cooperative agreement with Columbia University in 1896. This arrangement continued until the late 1960s, when the Biology Department at Columbia chose to emphasize laboratory-related research and discontinued its organismal programs. At the time a new partnership was formed with(More)
This study focuses on the use of botanical pesticides in Cajamarca, Peru. Fieldwork was conducted in four Quechua communities located in different ecological zones. Interviews and collection of specimens yielded 64 poisonous species and 22 species considered useful because of their toxic properties. The yellow fever mosquito bioassay was applied to(More)
An ethnobotanical study was conducted among the Jicaque Indians of the Montana de la Flor reservation in central Honduras to collect information regarding their plant-use practices. The data, including vernacular names, ecological settings, and uses, were recorded during collecting forays with Jicaque informants. Scientific and Jicaque names have been(More)
Early remains of Helianthus annuus L. unearthed at the San Andrés site in the Gulf Coast region of Tabasco, Mexico, constitute the earliest record of domesticated sunflower. Accelerator mass spectrometry (AMS) age determinations of a large domesticated seed and achene produced dates of 4130 ± 40 years before the present (B.P.) and 4085 ± 50 B.P.,(More)