Currently two different schools of thought interpret this major unresolved issue in developmental biology: Proponents of mechanical penetration hold that the motile force exerted from the sperm tail is sufficient to push the fertilizing spermatozoon through the ZP [7], [8].
In times of rapidly growing Internet penetration, the web holds the opportunity to deliver health information and support to large numbers of participants on comparatively low cost and at the time, place and learning speed the individual users prefer.
While the generic drug manufacturers were able to establish alternative ecosystems, their penetration of the market has been held to about 30%, with little price cutting by the dominant companies.
Revolutionary Guard commander Mohammad Ali Jafari issued another threat this past week at a press conference held to denounce western "penetration" of Iranian society.
The Daily Telegraph report that they only held a market share penetration of 5.3percentt in Australia — making them half the size of competitor Deliveroo, and a quarter of the size of Menulog and Uber Eats.
Political canonizers also cast aspersions on last year's bipartisan Cox report, which found serious penetrations of America's most closely held atomic secrets.
Ripley attended a series of hush-hush espionage schools near Washington and soon had to do with Intelligence plans for the penetration of the Dutch East Indies, then held by the Japanese.
There's also the Sunday Post, which held the world record for market penetration 40 years ago.
We have previously used the hand held SD-OCT to show the penetration of riboflavin for both epithelium-on and epithelium-off procedures [ 7].
