the ovum gets implanted in uterus after roughly the fifth day post fertilization with sperm.
the ovum gets implanted in uterus after roughly the fifth day post fertilization with sperm.
the ovum gets implanted in uterus after how many days post fertilization with sperm?
roughly the fifth day
Na
Na
small undulatory swimmers experience both inertial and viscous forces, the relative importance of which is indicated by reynolds number (re). reynolds number is proportional to body size and swimming speed. the swimming performance of a larva increases between 2-5 days post fertilization (d.p.f.). compared with adults, the larval fish experience relatively high viscous force. to enhance thrust to an equal level with the adults, it increases its tail beat frequency and thus amplitude. tail beat frequency increases over larval age to 95 hz in 3 days post fertilization (d.p.f.) from 80 hz in 2 days post fertilization (d.p.f.). this higher frequency leads to higher swimming speed, thus reducing predation and increasing prey catching ability when they start feeding at around 5 days post fertilization (d.p.f.). the vortex shedding mechanics changes with the flow regime in an inverse non-linear way. reynolds number (st) is considered as a design parameter for vortex shedding mechanism and can be defined as a ratio of product of tail beat frequency with amplitude with the mean swimming speed . reynolds number (re) is the main deciding criteria of a flow regime. it has been observed over different type of larval experiments that, slow larvae swims at higher reynolds number (st) but lower reynolds number (re). however, the faster larvae swims distinctively at opposite conditions, that is, at lower reynolds number (st) but higher reynolds number (re). reynolds number (st) is constant over similar speed ranged adult fishes. reynolds number (st) does not only depend on the small size of the swimmers, but also dependent to the flow regime. as in fishes which swim in viscous or high-friction flow regime, would create high body drag which will lead to higher reynolds number (st). whereas, in high viscous regime, the adults swim at lower stride length which leads to lower tail beat frequency and lower amplitude. this leads to higher thrust for same displacement or higher propulsive force, which unanimously reduces the reynolds number (re)..
fish locomotion