Results 41 to 50 of about 65,346 (303)

Sperm competition games: optimal sperm allocation in response to the size of competing ejaculates

, 2007
Engqvist L, Reinhold K. Sperm competition games: optimal sperm allocation in response to the size of competing ejaculates. Proceedings of the Royal Society B.
Reinhold, Klaus, Engqvist, Leif ; https://orcid.org/   +1 more
core   +1 more source

Modeling diffusive search by non-adaptive sperm: Empirical and computational insights.

PLoS Computational Biology
During fertilization, mammalian sperm undergo a winnowing selection process that reduces the candidate pool of potential fertilizers from ~106-1011 cells to 101-102 cells (depending on the species).
Benjamin M Brisard, Kylie D Cashwell, Stephanie M Stewart, Logan M Harrison, Aidan C Charles, Chelsea V Dennis, Ivie R Henslee, Ethan L Carrow, Heather A Belcher, Debajit Bhowmick, Paul W Vos, Maciej Majka, Martin Bier, David M Hart, Cameron A Schmidt   +14 more
doaj   +1 more source

Male scorpionflies assess the amount of rival sperm transferred by females' previous mates

, 2007
Engqvist L. Male scorpionflies assess the amount of rival sperm transferred by females' previous mates. Evolution. 2007;61(6):1489-1494.Theory predicts that when sperm compete numerically, selection will favor males who vary the number of sperm they ...
Engqvist, Leif ; https://orcid.org/
core   +1 more source

Identifying transcription factors controlling the basal expression of human MRP4 highlights a substantial role for Sp1

FEBS Open Bio, EarlyView.
The MRP4 transporter exports several drugs and signaling molecules. Here, we identified key promoter elements regulating basal MRP4 expression. Using reporter assays, we defined a conserved region with essential Sp1 and contributory Ets sites, which controlled basal MRP4 expression.
Debora Singer, Angelique Kragl, Katrin Ziems, Juliane Glaubitz, Sophie Grammbauer, Susanne Hildebrandt, Mladen V. Tzvetkov, Gabriele Jedlitschky   +7 more
wiley   +1 more source

A PMMA-Based Microfluidic Device for Human Sperm Evaluation and Screening on Swimming Capability and Swimming Persistence

Micromachines, 2020
The selection of high-quality sperm is essential to the success of in vitro fertilization (IVF). As human cervical mucus has a high viscosity, without enough swimming persistence, human sperm clouds cannot arrive at the ampulla to fertilize the egg.
Yimo Yan, Haoran Liu, Boxuan Zhang, Ran Liu   +3 more
doaj   +1 more source

Rapid Fabrication of Self‐Propelled and Steerable Magnetic Microcatheters for Precision Medicine

Advanced Materials, EarlyView.
A rapid Joule heating fabrication method for the production of self‐propelling, adaptive microcatheters, with tunable stiffness and integrated microfluidic channels is presented. Demonstrated through three microrobotic designs, including a steerable guiding catheter, an untethered wave‐crawling TubeBot, and a distal‐end propelled microcatheter, it was ...
Zhi Chen, Boris Rivkin, David Castellanos‐Robles, Ivan Soldatov, Lukas Beyer, Mariana Medina‐Sánchez   +5 more
wiley   +1 more source

Live Births Following Zona Pellucida–Binding Sperm Selection in Recurrent Implantation Failure: Two Case Reports

Fertility & Reproduction
Recurrent implantation failure (RIF) poses a significant challenge in assisted reproductive technologies (ART). Intracytoplasmic sperm injection (ICSI), while effective for male factor infertility, bypasses natural sperm selection, potentially reducing ...
Mahin Izadi, Serajoddin Vahidi Mehrjardi, Mohammad Ali Khalili, Mohammad Ebrahim Rezvani, Behrouz Aflatoonian   +4 more
doaj   +1 more source

Microneedles Mediated Delivery of Nanodiamonds for Quantum Sensing of Free Radicals in Skin Tissue

Advanced Materials Technologies, EarlyView.
Fluorescent nanodiamonds are nanoscale sensors capable of monitoring cellular stress responses. However, to function effectively, they must be delivered into cells or tissues. Here, we demonstrate their application in the skin by developing a dissolvable microneedle platform that dissolves after skin insertion, enabling the delivery of nanodiamonds ...
Siyu Fan, Maria Carmona Lobita, Thea Vedelaar, Yue Zhang, Claudia Reyes‐San‐Martin, Tomás Bauleth‐Ramos, Gésinda Geertsema‐Doornbusch, Han Gao, Mohammad‐Ali Shahbazi, Hélder A. Santos, Romana Schirhagl   +10 more
wiley   +1 more source

Is sperm morphology functionally related to sperm swimming ability? A case study in a wild passerine bird with male hierarchies

BMC Evolutionary Biology, 2018
Background Sexual selection continues after copulation via either sperm competition or cryptic female choice, and favors sperm traits that maximize sperm competitiveness.
Alfonso Rojas Mora, Magali Meniri, Sabrina Ciprietti, Fabrice Helfenstein   +3 more
doaj   +1 more source

A general description of additive and non-additive elements of sperm competitiveness and their relation to male fertilization success

, 2013
Engqvist L. A general description of additive and non-additive elements of sperm competitiveness and their relation to male fertilization success. Evolution.
Engqvist, Leif, Engqvist, Leif ; https://orcid.org/   +1 more
core   +1 more source