Results 71 to 80 of about 2,944,740 (334)
Sperm morphology, swimming velocity, and longevity in the house sparrow Passer domesticus [PDF]
, 2018 Sperm competition exerts strong selection on males to produce spermatozoa with an optimal morphology that maximizes their fertilization success. Long sperm were first suggested to be favored because they should swim faster.
Helfenstein, Fabrice +2 more
core
Duplicated female receptacle organs for traumatic insemination in the tropical bed bug Cimex hemipterus: adaptive variation or malformation? [PDF]
, 2014 During mating, male bed bugs (Cimicidae) pierce the female abdomen to inject sperm using their needle-like genitalia. Females evolved specialized paragenital organs (the spermalege and associated structures) to receive traumatically injected ejaculates ...
Kamimura, Yoshitaka +2 more
core +3 more sources
Proceedings of the Royal Society B: Biological Sciences, 2016 The relationship between sperm energetics and sperm function is poorly known, but is central to our understanding of the evolution of sperm traits. The aim of this study was to examine how sperm morphology and ATP content affect sperm swimming velocity ...
C. Bennison +4 more
semanticscholar +1 more source
Strong‐Magnetic Flexible Composites for Magnetically Responsive Soft Robots
Advanced Robotics Research, EarlyView.This perspective provides an overview of the performance mechanisms, preparation methods, and applications of strong magnetic flexible composite materials in soft actuators (such as gripping, movement, and sensing), and further explores current opportunities and challenges.
Wenwen Li +4 more
wiley +1 more source
A study of sperm quality assessment: Morphological defect in patients with normal sperm count
National Journal of Physiology, Pharmacy and Pharmacology, 2023 Background: Sperm morphology is the major benchmark in assessment of male infertility. There are limited studies available on frequency of qualitative defects of sperm in patients with normal sperm count.
Alpeshkumar M Maru +4 more
doaj +1 more source
Exceptional sperm cooperation in the wood mouse [PDF]
, 2002 Spermatozoa from a single male will compete for fertilization of ova with spermatozoa from another male when present in the female reproductive tract at the same time.
AH Harcourt +32 more
core +1 more source
Paternal Circadian Disruption Impairs Offspring Cognition via Sperm microRNAs
Advanced Science, EarlyView.Paternal circadian disruption remodels the sperm small RNA payload, elevating miR‐92a‐3p/miR‐25‐3p levels and perturbing early embryonic gene regulatory programs. Microinjection experiments and single‐embryo transcriptomics reveal sex‐specific developmental vulnerabilities, ultimately impairing offspring hippocampal synaptic plasticity and cognition ...
Kexin Zou +22 more
wiley +1 more source
Cells, 2021 Mammals exhibit a tremendous amount of variation in sperm morphology and despite the acknowledgement of sperm structural diversity across taxa, its functional significance remains poorly understood. Of particular interest is the sperm of rodents.
Kristin A. Hook +2 more
doaj +1 more source
Reproductive traits in Ethiopian male goats [PDF]
, 2007 This thesis characterizes reproductive traits of Ethiopian male goats raised under extensive husbandry and subjected to differential nutritional management.
Mekasha Gebre, Yoseph
core
Is there a relationship between sperm chromosome abnormalities and sperm morphology? [PDF]
, 2006 This review explores the relationship between sperm chromosomal constitution and morphology. With the advent of techniques for obtaining information on the chromosome complements of spermatozoa, this relationship has been studied in fertile men and in ...
Ko Evelyn, Sun Fei, Martin Renée H
core +2 more sources