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Nitric Oxide Is Involved In Growth Regulation And Re-Orientation Of Pollen Tubes, Ana Margarida Prado, D. M. Porterfield, José A. Feijó
Nitric Oxide Is Involved In Growth Regulation And Re-Orientation Of Pollen Tubes, Ana Margarida Prado, D. M. Porterfield, José A. Feijó
Biological Sciences Faculty Research & Creative Works
Nitric oxide (NO) controls diverse functions in many cells and organs of animals. It is also produced in plants and has a variety of effects, but little is known about their underlying mechanisms. in the present study, we have discovered a role for NO in the regulation of pollen tube growth, a fast tip-growing cellular system. Pollen tubes must be precisely oriented inside the anatomically complex female ovary in order to deliver sperm. We hypothesized that NO could play a role in this guidance and tested this hypothesis by challenging the growth of pollen tubes with an external NO point …
Allometry Of Kinematics And Energetics In Carpenter Bees (Xylocopa Varipuncta) Hovering In Variable-Density Gases, Stephen P. Roberts, Jon F. Harrison, Robert Dudley
Allometry Of Kinematics And Energetics In Carpenter Bees (Xylocopa Varipuncta) Hovering In Variable-Density Gases, Stephen P. Roberts, Jon F. Harrison, Robert Dudley
Biological Sciences Faculty Research & Creative Works
We Assessed the Energetic and Aerodynamic Limits of Hovering Flight in the Carpenter Bee Xylocopa Varipuncta. using Normoxic, Variable-Density Mixtures of O2, N2 and He, We Were Able to Elicit Maximal Hovering Performance and Aerodynamic Failure in the Majority of Bees Sampled. Bees Were Not Isometric Regarding Thorax Mass and Wing Area, Both of Which Were Disproportionately Lower in Heavier Individuals. the Minimal Gas Density Necessary for Hovering (MGD) Increased with Body Mass and Decreased with Relative Thoracic Muscle Mass. Only the Four Bees in Our Sample with the Highest Body Mass-Specific Thorax Masses Were Able to Hover in Pure …