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.
Check Fraud Prevention & Counterfeit Detector Pens. In busy retail environments where large amounts of money are being constantly exchanged, a counterfeit detector pen is a must-have item. Use a counterfeit money detector pen to quickly find out whether large-denomination bills are genuinely printed or are suspect. Make sure handwritten checks are also secure by using check fraud prevention pens, which help prevent criminal check washing and other document alterations.