Determined to be a mother and with no man yet on the horizon, she did some research on sperm banks and then ordered eight vials of sperm from an anonymous donor.
Protamine confers a higher order of DNA packaging in sperm than that found in somatic cells; thus the condensed and insoluble nature of the highly condensed sperm chromatin protects the genetic integrity of the paternal genome during its transport through the male and female reproductive tracts.
All the individuals were separated by their sex for at least seven days before the experiments in order to maintain similar levels of sperm storage in males and similar sexual receptivity of females.
At low viscosity, μ ∼ 1 mPa·s, sperm realign rapidly against the new flow direction with a typical response time of τ ∼ 5 s to 10 s, and the curvature radius is of the order of one or two sperm lengths ℓ ∼ 60 μm (Video 5).
For at least 7 days prior to the test, we separated the water striders according to their sex (30 individuals per 30 × 40 cm container filled with water) in order to maintain a similar level of sperm storage in males before the experiment and in order to avoid variation among females in the amount of sperm already received through recent copulations.
In order to assess whether the process of sperm induction corresponds to changes in the testes, we assessed male pedipalps for the presence of sperm.
In order to elucidate the molecular mechanism of sperm chemotaxis mediated by P, we combine the application of different strategies: pharmacological inhibition of signaling molecules, measurements of the concentrations of second messengers and activation of the chemotactic signaling.
Vaginal smears were collected on a daily basis in order to assess for the presence of sperm.
In order to quantify the absolute loss of sperm production, daily sperm production can be calculated (Robb et al., 1978; Cotton et al., 2006).
In this paper we present a new system and novel approaches to classify different kinds of sperm images in order to assess their health.
