Results 31 to 40 of about 273,320 (297)

Cell proliferation and differentiation kinetics during spermatogenesis in Hydra carnea [PDF]

, 1985
Spermatogenesis inHydra carnea was investigated. The cell proliferation and differentiation kinetics of intermediates in the spermatogenesis pathway were determined, using quantitative determinations of cell abundance, pulse and continuous labelling ...
A Brauer, A Weismann, B Romeis, CN David, CN David, CN David, CN David, E Downing, HR Bode, J Zihler, L Hyman, P Brien, P Brien, P Brien, P Tardent, P Tardent, RR Cowden, WF Loomis   +17 more
core   +1 more source

TRPV4 is the temperature-sensitive ion channel of human sperm

eLife, 2018
Ion channels control the ability of human sperm to fertilize the egg by triggering hyperactivated motility, which is regulated by membrane potential, intracellular pH, and cytosolic calcium.
Nadine Mundt, Marc Spehr, Polina V Lishko   +2 more
doaj   +1 more source

DNA demethylation by ROS1a in rice vegetative cells promotes methylation in sperm. [PDF]

, 2019
Epigenetic reprogramming is required for proper regulation of gene expression in eukaryotic organisms. In Arabidopsis, active DNA demethylation is crucial for seed viability, pollen function, and successful reproduction. The DEMETER (DME) DNA glycosylase
Fischer, Robert L, Kim, M Yvonne, Kinoshita, Tetsu, Okamoto, Takashi, Ono, Akemi, Scholten, Stefan, Zilberman, Daniel   +6 more
core   +2 more sources

Hydrodynamics of Sperm Cells near Surfaces [PDF]

Biophysical Journal, 2010
Sperm are propelled by an actively beating tail, and display a wide variety of swimming patterns. When confined between two parallel walls, sperm swim either in circles or on curvilinear trajectories close to the walls. We employ mesoscale hydrodynamics simulations in combination with a mechanical sperm model to study the swimming behavior near walls ...
Elgeti, J., Kaupp, U., Gompper, G.
openaire   +3 more sources

Can we Make SpermFAST? Improving Sperm Function to Increase Fertilisation Rates after in vitro Fertilisation

Fertility & Reproduction, 2022
Background: Intracytoplasmic sperm injection (ICSI) usage ([Formula: see text]64% of autologous cycles) has increased in Australia as an attempt to avoid low fertilisation and total fertilisation failure after standard in vitro fertilization (IVF).
Nicole O. MCPHERSON, Hamish HAMILTON, Deirdre ZANDER-FOX, Emily ARCHER, Hassan W. BAKOS   +4 more
doaj   +1 more source

Hydrogen peroxide has adverse effects on human sperm quality parameters, induces apoptosis, and reduces survival

Journal of Human Reproductive Sciences, 2021
Background: One of the causes of male fertility disorders is the exposure of oxidative stress on the human sperm. Understanding the mechanism of disturbance is important to develop a better treatment for infertile or subfertile patients. Aims: The aim of
Dwi Ari Pujianto, Mona Oktarina, Ida Ayu Sharma Sharaswati, Yulhasri   +3 more
doaj   +1 more source

Sperm Inspection for In Vitro Fertilization via Self-Assembled Microdroplet Formation and Quantitative Phase Microscopy

Cells, 2021
We present a new method for the selection of individual sperm cells using a microfluidic device that automatically traps each cell in a separate microdroplet that then individually self-assembles with other microdroplets, permitting the controlled ...
Yuval Atzitz, Matan Dudaie, Itay Barnea, Natan T. Shaked   +3 more
doaj   +1 more source

Rheotaxis facilitates upstream navigation of mammalian sperm cells [PDF]

, 2014
A major puzzle in biology is how mammalian sperm determine and maintain the correct swimming direction during the various phases of the sexual reproduction process.
Adolphi, Bahat, Brenker, Chengala, Denissenko, Eisenbach, Elgeti, Eschenbach, Fauci, Fauci, Friedrich, Gaffney, Gibbons, Han, Ishijima, Kantsler, Katz, Kaupp, Kunz, Marcos, Marcos, Merviel, Miki, Montenegro-Johnson, Owen, Riffell, Roberts, Rothschild, Smith, Smith, Spehr, Su, Suarez, Talkner, Wilson, Winet, Woolley, Zimmer   +37 more
core   +3 more sources

Generation of Haploid Spermatids with Fertilization and Development Capacity from Human Spermatogonial Stem Cells of Cryptorchid Patients

Stem Cell Reports, 2014
Generation of functional spermatids from azoospermia patients is of unusual significance in the treatment of male infertility. Here, we report an efficient approach to obtain human functional spermatids from cryptorchid patients.
Shi Yang, Ping Ping, Meng Ma, Peng Li, Ruhui Tian, Hao Yang, Yang Liu, Yuehua Gong, Zhenzhen Zhang, Zheng Li, Zuping He   +10 more
doaj   +1 more source

Inhibition of extracellular ice crystals growth for testing the cryodamaging effect of intracellular ice in a model of ram sperm ultra-rapid freezing

Journal of Applied Animal Research, 2023
We aimed to test the common belief, that as the sperm cell is the smallest cell in an organism and, therefore, it contains a small amount of intracellular water, the intracellular ice should not strongly affect the sperm cell during the cryopreservation.
Filipp Georgijevic Savvulidi, Martin Ptacek, Anezka Malkova, Irena Kratochvilova, Daniel Simek, Felipe Martinez-Pastor, Ludek Stadnik   +6 more
doaj   +1 more source