Results 211 to 220 of about 48,619 (254)

Simultaneous swim-up/swim-down of sperm in assisted reproduction procedures

Journal of Assisted Reproduction and Genetics, 1993
High-quality motile human spermatozoa were obtained following treatment of semen by simultaneous swim-up into medium and swim-down into an isotonic 40% Percoll solution.This procedure was significantly better than the swim-up method and comparable to discontinuous Percoll gradient centrifugation. Recovery rates of motile sperm were 35% for swim-up, 65%
M Almagor, Haim Yaffe, H Yaffe
exaly   +3 more sources

A comparison of swim-down and swim-up methods for the extraction of high motility sperm

Fertility and Sterility, 1991
High quality motile sperm are essential for the success of the in vitro fertilization-embryo transfer program and related procedures, for the performance of sperm antibody assays, and other in vitro tests of sperm function. Two methods for the extraction of high motility sperm, swim-down and swim-up, were compared on 30 ejaculates, and sperm motility ...
R M, Ing, D Q, Li, A M, Harding, W R, Jones   +3 more
openaire   +2 more sources

???Pumped-up propulsion??? during front crawl swimming

Medicine and Science in Sports and Exercise, 2002
It is currently held that propulsion in human front crawl swimming is achieved by lift and drag forces predominantly generated by the hands. Calculation of these propulsive forces relies on the quasi-steady assumption that the fluid dynamic behavior of a hand model in a flow channel (constant velocity and orientation) is similar to that of a hand of a ...
Toussaint, H.M., van den Berg, C., Beek, W.J.   +2 more
openaire   +3 more sources

Factors affecting sperm yield during swim-up

Journal of Assisted Reproduction and Genetics, 1993
The migration of sperm (expressed as the percentage of the total motile cells in the ejaculate aliquot) from seminal plasma into overlying medium (swim-up) was increased with time, temperature, and increasing the surface area of contact between the two phases by increasing the angle of tube inclination.The proportion of sperm migrating into the medium ...
K, Purvis, I, Egdetveit
openaire   +2 more sources

Failure of multitube sperm swim-up for sex preselection

Fertility and Sterility, 1997
To use double-label fluorescence in situ hybridization to evaluate a modified swim-up procedure that is purported to be effective for preconceptual sex selection.Controlled, blinded study.University hospital laboratories.Donor males reporting for routine semen analysis.Percentages of X- and Y-bearing spermatozoa in neat semen and in two swim-up ...
De Jonge, Christopher J., Flaherty, Sean P., Barnes, Annette M., Swann, Nicholas J., Matthews, Colin D.   +4 more
openaire   +3 more sources

A follow-up study of sperm preparation for IVF by swim-up in a solution of hyaluronate

Human Reproduction, 1991
Spermatozoa prepared for in-vitro fertilization (IVF) by swim-up in a balanced salt solution containing hyaluronate gave rates of fertilization, cleavage and pregnancy which were not significantly different from those obtained with sperm prepared by swim-up in standard IVF medium followed by centrifugation. However, the content of prostaglandin F2alpha
P, Sjöblom, M, Wikland
openaire   +2 more sources

Relationship Between Dryland Strength and Swimming Performance: Pull-Up Mechanics as a Predictor of Swimming Speed

Journal of Strength and Conditioning Research, 2018
Abstract Pérez-Olea, JI, Valenzuela, PL, Aponte, C, and Izquierdo, M. Relationship between dryland strength and swimming performance: pull-up mechanics as a predictor of swimming speed. J Strength Cond Res 32(6): 1637–1642, 2018—This study aimed to examine the validity of the countermovement jump (CMJ) and the pull-up exercise as predictors ...
José I, Pérez-Olea, Pedro L, Valenzuela, Concepción, Aponte, Mikel, Izquierdo   +3 more
openaire   +2 more sources

Increased recovery of swim-up spermatozoa by application of “antigravitational” centrifugation

Fertility and Sterility, 1999
To compare the quantity and quality of sperm recovered following the 10-minute application of an antigravitational force during the swim-up procedure with the standard 60-minute swim-up (SSU) procedure.Prospectively controlled in vitro study.Private andrology laboratory and hospital-based infertility practice.Equal aliquots of semen were evaluated ...
C J, Babbo, B R, Hecht, R S, Jeyendran
openaire   +2 more sources

Swim-up procedure selects spermatozoa with longer telomere length

Mutation Research - Fundamental and Molecular Mechanisms of Mutagenesis, 2010
Telomere length and sperm DNA fragmentation were determined in sperm samples from 27 patients, using a quantitative PCR (Q-PCR) assay and the Sperm Chromatin Dispersion (SCD) test, respectively. Comparisons of the samples before and after swim-up processing demonstrated that this procedure selects a sperm population with longer average telomere size ...
Rebeca, Santiso, María, Tamayo, Jaime, Gosálvez, Marcos, Meseguer, Nicolás, Garrido, José Luis, Fernández   +5 more
openaire   +2 more sources

A Controlled Study for Gender Selection Using Swim-Up Separation

Gynecologic and Obstetric Investigation, 1999
<i>Objective:</i> To evaluate the success for gender selection using a sample of semen separated by a modified swim-up technique. <i>Design:</i> We retrospectively compared the gender outcome of two treatments (A and B) for either a male or female offspring with those who conceived spontaneously.
M A, Khatamee, S R, Horn, A, Weseley, T, Farooq, S B, Jaffe, R, Jewelewicz   +5 more
openaire   +2 more sources