How To Use Blastula In A Sentence
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Note the blastula in reptiles is called a blastoderm or blastodisk because the divisions have been concentrated into a thin disk of cells at the animal pole.
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the invagination of the blastula
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At blastula stage 8, cells forming the blastocoelic roof were cultured in isolation as explants.
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Apparently, one of the master Scientists was trying to cark Scutari blastulas into a shape more to his liking.
THE BROKEN GOD
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The whole performance does indeed remind me of the foldings and invaginations that the membranes of an embryo undergo as it morphs itself from blastula to gastrula to neurula.
The God Delusion
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The globular wall of the blastula is a real blastoderm, and consists of homogeneous (blastodermic) cells; it is not yet differentiated into the two primary germinal layers.
The Evolution of Man — Volume 1
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Thus a portion of the upper marginal zone of the blastula or early gastrula, or else a piece of the roof of the archenteron of the mature gastrula was planted in the blastocoele of a young gastrula and so brought beneath the ectoderm from the beginning; it was demonstrated that these portions were able to induce neural plate.
Hans Spemann - Nobel Lecture
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That is to say, those parts of the embryo which are being examined for their inductive capacity can be made to bypass the activte invagination and can be made effective by inserting them in the blastocoele through a small slit in the roof of the blastula or young gastrula which quickly heals over.
Hans Spemann - Nobel Lecture
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By the formation of an inner cavity or blastocoele, the blastocyst or blastula comes into being.
Hans Spemann - Nobel Lecture
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Inside this spherical mass of cells, a fluid-filled cavity - the blastocoel - develops in the animal region and the embryo is now called a blastula.
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During gastrulation, cells on the outside of the embryo move inwards and, in animals such as the sea urchin, gastrulation even transforms a hollow spherical blastula into a gastrula with a hole through the middle - the gut.
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The blastula deforms as if a finger were pushing into a balloon.
THE BROKEN GOD
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The development of most animals is characterized by distinctive stages, including a zygote, formed by the product of the first few division of cells following fertilization; a blastula, which is a hollow ball of cells formed by the developing zygote; and a gastrula, which is formed when the blastula folds in on itself to form a double-walled structure with an opening to the outside, the
Conservapedia - Recent changes [en]
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Although the mass of the food-yelk may be very large in the ova of the discoblastic vertebrates, nevertheless in every case a blastula is developed from the morula, as in the holoblastic ova.
The Evolution of Man — Volume 1
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You can see the early scrambling of cells in the blastula, migration during epiboly and blastopore closure, and convergence in the formation of the body axis fairly easily.
Planet Atheism
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It was also shown that what is called delamination -- the rise of the two primary germinal layers by the folding of the surface of the blastoderm (for instance, in the Geryonidae and other medusae) -- was a secondary formation, due to cenogenetic variations from the original invagination of the blastula.
The Evolution of Man — Volume 1
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Gastrulation in its broadest sense is the reorganization of the cells of the blastula to form a multilayered embryo, the gastrula.
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What it illustrates is that we have great diversity in the earliest stages of development, in the blastula and gastrula and neurula, but that they all converge on a more similar form, the pharyngula, at what’s called the phylotypic stage…and then they diverge once again to achieve the diversity of adult forms.
The Politically Incorrect Guide to Darwinism and Intelligent Design Review: Simply Incorrect Embryology (Chapter 3) - The Panda's Thumb
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They migrate along the inner face of the blastula wall to form a ring in the vegetal region and lay down calcareous skeletal rods.
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The series of mitotic cell divisions that produces a blastula from a fertilized ovum. It is the basis of the multicellularity of complex organisms.
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How is it possible that in the past six months, this microscopic blastula has transformed into a being with its own organs, spinal cord and brain?
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Apparently, one of the master Scientists was trying to cark Scutari blastulas into a shape more to his liking.
THE BROKEN GOD
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The only people politicizing the use of embryonic stem cells are those who claim that a blastula, which is an invisible to the naked eye group of cells an embryo is not the same thing as a fetus, is a human.
Think Progress » Michael J. Fox: ‘I Could Give a Damn About Rush Limbaugh’s Pity…I’m Not A Victim’
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After the egg is fertilized it becomes a blastula, which is free swimming.
CreationWiki - Recent changes [en]
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With time, cells gradually become determined, so that similar cells taken from later-stage blastulas and early gastrulas develop according to their fate at the time of transplantation.
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Apparently, one of the master Scientists was trying to cark Scutari blastulas into a shape more to his liking.
THE BROKEN GOD
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Embryos treated at lower concentrations showed delayed gastrulation and those treated at higher concentrations developed to blastulae having abnormal blastocoels with excess cells.
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In the former, cleavage gives rise to a hollow blastula, which is filled in to a greater or lesser extent by the unipolar immigration of cells, much as occurs in hydrozoan cnidarians.
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At this stage, the blastula is in the form of a hollow sphere with radial symmetry.
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Thus a portion of the upper marginal zone of the blastula or early gastrula, or else a piece of the roof of the archenteron of the mature gastrula was planted in the blastocoele of a young gastrula and so brought beneath the ectoderm from the beginning; it was demonstrated that these portions were able to induce neural plate.
Hans Spemann - Nobel Lecture
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The nucleus must be taken from the blastula and gastrula stages of frog embryos (at this point no semblance or form of the creature is distinguishable).
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A blastula, with wide embryonic cavity (blastocoel, bl), g incipient invagination.
The Evolution of Man — Volume 1
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It’s not a solid ball but a hollow one, and it is called the blastula.
THE GREATEST SHOW ON EARTH
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Gastrulation in its broadest sense is the reorganization of the cells of the blastula to form a multilayered embryo, the gastrula.
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Thus a portion of the upper marginal zone of the blastula or early gastrula, or else a piece of the roof of the archenteron of the mature gastrula was planted in the blastocoele of a young gastrula and so brought beneath the ectoderm from the beginning; it was demonstrated that these portions were able to induce neural plate.
Hans Spemann - Nobel Lecture
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There are still to-day some organisms that remain throughout life at the structural stage of the blastula -- hollow vesicles that swim about by a ciliary movement in the water, the wall of which is composed of a single layer of cells, such as the volvox, the magosphaera, synura, etc.
The Evolution of Man — Volume 1
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Thus, if the bisection is not made as early as between the two cells after the first segmentation but later, even at the blastula stage, or at that of the very young gastrula, you can still get twins.
Hans Spemann - Nobel Lecture
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You might think of it as the equivalent of a blastula in embryology.
PREY
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In the sea-urchin embryo, for instance, the primary mesenchyme originates from epithelial cells of the blastula by their losing cadherins and producing enzymes that allow them to invade the basal lamina.
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A lot of research has gone into answering that, and determining the earliest stage at which the blastula breaks symmetry.