increase in pollen aperture number, suggesting that pollen apertures are under strong selection pressure. This trend can be observed by comparing the aperture patterns in basal angiosperms (including monocots) with those of eudicots. Different developmental strate-gies operate for pollen apertures in basal angiosperms
Reuse your fountain pen by refilling the ink. Use the method that is suitable for your type of pen. 1  Fill ink in a piston converter pen by removing the cap and barrel and then dipping the nib inside the ink bottle. 2  Lower the piston to remove the air inside. 3  When you pull up the piston, the ink will be sucked in.
Gel Pen Guide. Gel Pens use water-based ink with a viscosity or thickness that can fluctuate (not the thickness of the line, necessarily, but the thickness of the liquid ink itself). When a gel pen is not being used, the ink tends to have a higher viscosity, or thicker ink. When the ball starts to rotate, the ink thins down and is dragged in a similar manner as roller ball ink. Gel pens provide the best of both worldsâthe smoother write of a roller ball, with the performance of a ballpoint.