Results 91 to 100 of about 1,124,248 (284)
A cost for high levels of sperm competition in rodents: Increased sperm DNA fragmentation [PDF]
, 2016 Spermcompetition, a prevalent evolutionary process inwhich the spermatozoa of two or more males compete for the fertilization of the same ovum, leads to morphological and physiological adaptations, including increases in energetic metabolism that may ...
Soler, Ana J. +7 more
core +1 more source
Journal of Applied Toxicology, EarlyView.ABSTRACT Glyphosate has long been considered to pose negligible direct risk to mammals on the grounds that its molecular target, 5‐enolpyruvylshikimate‐3‐phosphate synthase (EPSPS), of the shikimate pathway, is absent from animal cells. This rationale is inaccurate as a complete toxicological argument, because the shikimate pathway is present in some ...
Robin Mesnage
wiley +1 more source
La compétition spermatique chez les insectes: les stratégies d'assurance de la paternité et la préséance du sperme [PDF]
Biotechnologie, Agronomie, Société et Environnement, 1999 Sperm competition in insects: paternity assurance and sperm precedence. The prediction that insects, as a result of polyandry, extreme sperm longevity within the female and high efficiency of sperm utilisation at fertilisation, are preadapted to sustain ...
Arnaud L.
doaj
Journal of the Science of Food and Agriculture, EarlyView.Abstract BACKGROUND The present study investigated the potential health risks of heavy metals (HMs) in the fruits and leaves of mulberry and sour cherry trees exposed to water from Sivas geothermal basin (Turkey). RESULTS The target HMs were ranked according to their hazard index as: Cd < Pb < Zn < Cu < Ni < Mn < Cr. The total hazard index for mulberry
E Işıl Arslan Topal +3 more
wiley +1 more source
Sperm competition in grey whales
Nature, 1988 SIR-Your legend for the drawing of grey whales taken from Cyall Watson's book Whales of the World, perpetuates the myth that a 'helper' male is necessary for successful mating in this species. The legend states that: "Only one male is involved in the actual mating; the other takes an upright position on the far side of the female, acting as a prop or ...
Ralls, Katherine +1 more
openaire +3 more sources
Understanding the Concept of Self‐Performed Ultrasound: A Scoping Review
Journal of Ultrasound in Medicine, EarlyView.Self‐performed ultrasound is an emerging technology that facilitates adept self‐scans in untrained hands. Inspired by self‐performed imaging in space for more prompt diagnosis and therapy, it has the potential to accurately monitor chronic conditions remotely. However, the lack of supervision and physical restraints can hinder its usability.
Vy Do +3 more
wiley +1 more source
Mass Spectrometry Reviews, EarlyView.ABSTRACT The use of MALDI mass spectrometry for the analysis of carbohydrates and glycoconjugates is a well‐established technique and this comprehensive review is the twelfth update of the original article published in 1999 and brings coverage of the literature to the end of 2024.
David J. Harvey
wiley +1 more source
Accessory gland size increases with sperm competition intensity in Cataglyphis desert ants
Frontiers in Ecology and EvolutionIn many species, females have multiple mates, whose sperm compete for paternity. Males may subsequently invest in the increased production of sperm and/or seminal fluid. The latter is a complex mixture of proteins, peptides, and other compounds generated
Félicien Degueldre, Serge Aron
doaj +1 more source
PLoS ONE, 2008 When females are sexually promiscuous, the intensity of sperm competition for males depends on how many partners females mate with. To maximize fitness, males should adjust their copulatory investment in relation to this intensity. However, fitness costs
Melissa L Thomas, Leigh W Simmons
doaj +1 more source
Role of the epididymis in sperm competition
Asian Journal of Andrology, 2007 Although it is generally understood that the testes recruited kidney ducts for reproductive function during the evolution of vertebrates, little is understood of the biological significance of the adaptation. In the context of the evolution of the mammalian epididymis, this report provides evidence that a major role of the epididymis is to enhance a ...
Jones, Russell C +3 more
openaire +3 more sources