Sentences with phrase «in animal reproduction»

Schal says the findings broke some new ground in describing previously unseen satellite strategies in animal reproduction.

Not exact matches

It stimulates growth cell reproduction and regeneration in humans and other animals.

Thus, at the lowest level, electrons tend to unite and converge in the atom; atoms converge by molecularization, crystallization; molecules unite by polymerization; cells unite by conjugation, reproduction, association; nerve ganglions concentrate and localize to form a brain by what might be called a process of cephalization; the higher animal groups form colonies, hives, herds, societies, etc.; man socializes and forms civilizations as foci of attraction and organization.

In the animal realm, as a simple biological fact, the sexual drive, desire, and equipment are directed toward the reproduction of the race, with a high degree of excitation to promote this — and perhaps also with some trace of affection on the part of those who engage in sexual activitIn the animal realm, as a simple biological fact, the sexual drive, desire, and equipment are directed toward the reproduction of the race, with a high degree of excitation to promote this — and perhaps also with some trace of affection on the part of those who engage in sexual activitin sexual activity.

«The phenotypic and genomic data collected as part of the MDC project will improve the accuracy of estimated breeding values (EBVs) describing economically important reproduction traits in animals, related to the Kaiuroo herd, throughout the Brahman breed.»

Overseen by Animal Genetics and Breeding Unit (AGBU) researcher Matt Wolcott, the project is intensively genotyping and collecting accurate records for male and female reproduction, growth and tropical adaptation traits in Kaiuroo stud bulls and females during the next three years.

Asexual whiptails have a special trick for making spermless reproduction work: The egg cells in other animals first double their choromosomes once and then divide twice, leaving them as haploid cells, with half the normal number of genetic material.

Sexual reproduction in the animal kingdom is often a tenuous alliance between male and female.

«As phenology is advancing around the globe, there are concerns that plant - pollinator interactions may be disrupted through phenological mismatches, or mismatches in the timing of when flowers bloom and their pollinators emerge, leading to reduced plant reproduction,» says lead author Zak Gezon, who conducted the research as a doctoral student at Dartmouth and who is now a conservation biologist with Disney's Animal Programs.

In humans, as in most animal species, the state of the female body is very important for the success of reproductioIn humans, as in most animal species, the state of the female body is very important for the success of reproductioin most animal species, the state of the female body is very important for the success of reproduction.

Contributors discuss theoretical and empirical perspectives on the fate of animal and plant groups in which sexual reproduction has been lost.

The hypothesis aims to explain how the process of becoming close to people produces comparable changes in the appearance, reproduction and physiology of a whole range of domesticated animals.

Activity in the insulin / IGF signaling pathway is reduced, and the animal shifts into a maintenance mode that favors long - term survival over immediate reproduction.

That in itself raises fundamental biological questions: If asexual females grow faster and bear children much more quickly than sexual females, what's the purpose of sex, and why is it the dominant method of reproduction in the animal world?

Since the sexual reproduction stage of malaria only occurs in insects, Poinar said in the new study that they must be considered the primary hosts of the disease, not the vertebrate animals that they infect with disease - causing protozoa.

«In contrast, with this food - sensing system in place, the animal builds up reserves and suspends reproduction until food is restoreIn contrast, with this food - sensing system in place, the animal builds up reserves and suspends reproduction until food is restorein place, the animal builds up reserves and suspends reproduction until food is restored.

The first of these will focus on the potential use of genome editing in human reproduction to avoid the transmission of heritable genetic conditions, and the second on livestock to improve systems of animal husbandry and food production.

Microbes assist in digestion, reproduction and even accelerate the pace of animal evolution, he demonstrated.

Life history traits are the things in an animal's life that affect life expectancy — critical issues like reproduction, growth, and survival.

Growth hormone is a polypeptide hormone synthesised and secreted by the anterior pituitary gland which stimulates growth and cell reproduction in humans and other vertebrate animals.

Yukio Tsunoda, a professor of animal reproduction at Kinki, refers modestly to «beginner's luck,» but most analysts point instead to Japan's extensive support for the latest biotech tools in livestock research.

Because high stress levels can cut into life - span and reproduction, at least in laboratory animals, Wasser says the results — which he emphasizes are preliminary — raise some questions about the efficacy of federal regulations designed to protect the owl.

Some focused on the growth, reproduction and other properties of microbes, plants and animals in space.

«Estrogens perform important biological functions not only in sexual development and reproduction, but also in modulating many other processes impacting health and diseases in human and animals,» Beinhauer said.

Having two copies of a form of the TSHR gene is thought to lead to a loss of seasonal reproduction in many domestic animals.

The new research indicates that bioluminescence — a phenomenon in which animals generate visible light through a chemical reaction — could promote communication and mating in the open ocean, an environment with few barriers to reproduction.

In addition, the treatment process appeared to convert a less harmful form of estrogen into one with greater potential for disrupting the function of animals» endocrine systems, which produce hormones that regulate growth, reproduction and other biological functions.

The first clues that assisted reproduction was causing changes in methylation and gene expression came from animal cloning studies back in 2001, Sapienza says.

«When you use animal models and do the things that are commonly done in assisted reproduction, the answer is yes — it affects DNA methylation.»

This extreme all - or - nothing mode of reproduction demonstrates a general principle: Animals need to decide if they invest their available energy stores either in growth or in reproduction.

Such stereotypes, the paper's authors argue, could leave scientists in the dark about certain aspects of animal reproduction.

«Through this study, the pandas at the San Diego Zoo have made a significant contribution to our understanding of what may be affecting panda reproduction in habitats in China,» said Ron Swaisgood, director of applied animal ecology, San Diego Zoo Global.

In the 1750s John Hunter, the Scottish «father of surgery,» did extensive studies on animal dentition, reproduction, and circulation by dissecting the bodies of tigers, lions, and rhinoceroses procured from the Tower's collection.

Now a group in Japan has shown for the first time that clones die younger than animals created by old - fashioned sexual reproduction.

Yet while some animal and plant species can reproduce without sex, such as komodo dragons, starfish and bananas, sex is still the dominant mode of reproduction in the natural world.

Unlike many other cellular and physiological processes, human reproduction varies in significant ways from that of common laboratory animals like mice or fruit flies.

Even smaller oxygen declines can stunt growth in animals, hinder reproduction and lead to disease or even death.

My research investigates why costly sexual reproduction is so common in the animal kingdom.

Humans have been altering animals and plants through selective breeding for millennia; but, because these changes typically reduce the capacity for survival and reproduction in the wild, they do not spread to wild populations.

Since nematodes are the only known organisms to use ascarosides, «we don't have to be afraid of interfering with similar biochemistry in animals, plants or humans,» Schroeder said, as researchers seek to identify species - specific ascaroside molecules that may enable novel approaches to deter or disrupt the survival or reproduction of parasitic worms.

The lack of a universal male reproductive factor among all animal lineages, while consistent with rapid evolution of male reproductive genes, is in contrast to the prevalence of sexual reproduction and in particular to the similarity in male gametogenesis among metazoan animals [34], [69].

Given that sexual reproduction is widespread among animals and sperm production appears to be present in all major phyla of metazoan animals, it raised a question whether any male - biased reproductive gene could be exempt from such selective pressure and remain conserved through extended evolutionary distances.

The presence of Boule in various animals provided the rare opportunity to examine how selective forces shaped the molecular evolution of a reproduction - specific gene in distant lineages.

Horse breeding is reproduction in horses, and particularly the human - directed process of selective breeding of animals, particularly purebred horses of a given breed.

While sexual reproduction is widespread among animals, it remains enigmatic to what extent sexual reproduction is conserved and when sex - specific gametogenesis (spermatogenesis and oogenesis) originated in animals.

Sexual reproduction in which male animals produce motile sperm often with flagellum is found in all major phyla of metazoan animals [84].

However, sexual reproduction in higher eukaryotes is more complex than meiosis alone, and has evolved independently in plants and animals.

Sex - specific traits that lead to the production of dimorphic gametes, sperm in males and eggs in females, are fundamental for sexual reproduction and accordingly widespread among animals.

While meiosis is fundamental to sexual reproduction and key components of meiotic machinery for chromosomal synapses and recombination are conserved from yeast to mammals [2], [76], the absence of Boule homologs in fungi together with the requirement of Boule homologs in only one sex of animals suggest that conservation of Boule is unlikely due to the same functional constraint that keeps components of meiotic machinery conserved.

The vitamins and fatty acids carried uniquely in saturated animal fats are necessary for normal reproduction.