منابع مشابه
Sperm Biology: Size Indeed Matters
Although sperm are typically thought to be small, tadpole-like cells produced in vast quantities, sperm size, form and number all vary tremendously across species. Sperm form ranges from amoeboid or discoid to multiflagellate elongated structures [1]. Even within the more familiar uniflagellate spermatozoa, length varies by several orders of magnitude, from the tiny 28μm long porcupine sperm to...
متن کاملSperm Viability Matters in Insect Sperm Competition
Experimental studies in insects have shown how sperm competition can be a potent selective force acting on an array of male reproductive traits . However, the role of sperm quality in determining paternity in insects has been neglected, despite the fact that sperm quality has been shown to influence the outcome of sperm competition in vertebrates . A recent comparative analysis found that males...
متن کاملSize matters
Charles Darwin when developing his theory of evolution. And a new study of work on the islands' marine iguanas may help throw some more light on the evolution of body size within these populations. Body size is one of the most important traits of organisms and allows predictions of an individual's morphology, physiology, behaviour and life history. However, explaining the evolution of such comp...
متن کاملMatters of Size
Size does matter. At least that’s what the tagline of the movie Godzilla claims (one of the many renditions of the franchise). A quick glance at the great beasts of our past—dinosaurs, marine animals, snakes, why even disturbingly massive dragonflies, scorpions and camels—would make it appear as if increased body size conferred some sort of advantage then. Yet biologists concur that overall, th...
متن کامل(Genome) size matters.
The quotation above has led to the commonly held view that all bacteria will eventually become resistant to any antibiotic given enough time and exposure. However not all bacteria develop resistance to antibiotics at the same rate (and perhaps some species of bacteria may never develop resistance to certain antibiotics). And some bacteria that have been labeled “resistant” are not, in any clini...
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ژورنال
عنوان ژورنال: Current Biology
سال: 2003
ISSN: 0960-9822
DOI: 10.1016/s0960-9822(03)00275-6