21s
National Institutes of Health
Papers overview
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Ecotourism is increasing throughout the world and in particular in less developed countries where it is often promoted in…
In March 1996, representatives from several Peruvian cities, grassroots organizations and NGOs, together with scientists and…
The biochemical properties of 21S dynein derived from sea urchin sperm flagella and of its components dissociated by low salt…
The two elementary effectors, cilia and muscles, are found throughout almost the whole range of the animal kingdom. In such…
Psilophyton princeps , though still incompletely known, is one of the most important Early Devonian plants, both on account of…