In this study we report on magnetic orientation of human sperms. Samples were taken from 17 donors. Normal human
sperms became oriented with their long axis perpendicular to the magnetic field ( 1 Tesla maximum). Total orientation
was achieved with magnetic field at about one Tesla, while for abnormal sperms the magnetic behavior was different.
The dependence of the measured degree of orientation on the intensity of the magnetic field was in good agreement with
the theoretical equation for the magnetic orientation of diamagnetic substances. As a result for a numerical analysis
based on the equation, the anisotropic diamagnetic susceptibility of normal sperm was found to be ▵χ= 8×10-20 J/T2. The
degree of orientation was influenced by the alterations in the shape of the head, body or the tail. It has been suggested
that the DNA in the sperm head retain the strong magnetic anisotropy to counter balance the magnetic anisotropy
retained by flagellum microtubules. Recent studies demonstrated a well-defined nuclear architecture in human sperm
nucleus, where the head morphology has significant correlation with sperm chromatin structure assay SCSA. Then as the
methods to evaluate SCSA can be difficult and expensive our simple magnetic orientation technique can be an
alternative to diagnose alteration in DNA.
An experimental technique to evaluate the elastic limit for rabbit skin is developed and described. The experimental technique is designed to measure small changes in the normalized reflectivity as a function of applied stretch, with a laser wavelength of 632.8 nm and power of 1 mW. When the samples of rabbit skin are stretched, the reflectivity increases until a critical point (elastic limit) is reached. After this point, the curve drops off very quickly. The elastic limit for the male dorsal samples is less than that for the female samples, with an average strain of 14.4 and 34.6% in males and females, respectively. Moreover, our results show that the average slope of the regression lines is greater for the male dorsal samples than the dorsal female samples. This indicates that the male dorsal skin is rougher than that of the female.