Hyperactivacion of sperm entails increases in the flagellar wave amplitude and the asymmetry of flagellar movement. In simple media on glass slides, hyperactivated sperm are not highly progressive. Nevertheless, we have evidence that hyperactivated sperm within the oviduct possess greater ability to reach the oocyte plasmalemma than normal activated sperm. First, hyperactivated rabbit sperm, fl...

BACKGROUND It is estimated that about 50% of causes of recurrent pregnancy loss (RPL) cases remain unknown. Sperm factors are suggested to have probable role in cases with RPL. OBJECTIVE The goal was to determine the possible relationship between semen bacterial contaminations with unexplained RPL. Also, the correlation between number of bacterial colony and sperm chromatin condensation was e...

Leptospirosis caused by Leptospira interrogans is the most widespread zoonosis and a major public health problem worldwide. Based on light-scattering and absorption, quantification of leptospires using UV-VIS spectroscopy was used as an indirect counting technique by measuring the optical density and comparing this to automated direct counting using a counting chamber in combination with imagin...

Background: The purpose of this study was to determine whether 50 days of forced swimming stress applied to adult male rats affects count, motility and fertilization capacity of sperm Materials and Methods: A total 30 adult male wistar rats were used in this study. All rats were divided into two equal groups (n = 15): (1) control group and (2) experimental group. Animals of the experimental gro...

background: one of the main laboratory tests for evaluation of infertility is semen analysis (sa). however additional tests may be suggested for further diagnosis of male fertility potentials. the seminal fluid contains sperms non-sperm cells and various types of lipids and glucose. objective: the objective of this cross-sectional study was to correlate the sperm parameters with concentrations ...

We study double Hurwitz numbers in genus zero counting the number of covers CP → CP with two branching points with a given branching behavior. By the recent result due to Goulden, Jackson and Vakil, these numbers are piecewise polynomials in the multiplicities of the preimages of the branching points. We describe the partition of the parameter space into polynomiality domains, called chambers, ...

The effects of miticides on the reproductive physiology of queens and drones were examined. The first study examined the effects of Apistan (fluvalinate), Check Mite+ (coumaphos), and Apilife VAR (74% thymol) on sperm production and viability in drones. Drones from colonies treated with each miticide were collected at sexual maturity. Sperm production was determined by counting the number of sp...

Ejaculated, density purified, human spermatozoa were exposed to pulsed 900 MHz GSM mobile phone radiation at two specific absorption rate levels (SAR 2.0 and 5.7 W/kg) and compared with controls over time. Change in sperm mitochondrial membrane potential was analysed using flow cytometry. Sperm motility was determined by computer assisted sperm analysis (CASA). There was no effect of pulsed 900...

Let $X$ be a Calabi-Yau 4-fold and $D$ smooth divisor on it. We consider tautological complex associated with $L=\mathcal{O}_X(D)$ the moduli space of Le Potier stable pairs define its counting invariant by integrating Euler class against virtual class. conjecture formula for their generating series expressed using genus zero Gopakumar-Vafa invariants one type $X$, which we verify in several ex...