英语词汇“blastula”造句的方法、技巧、例句及翻译-英语例句辞典

But before you can say blastula, his wife — he begins by calling her Clo, then just goes with her real name, Jen — is crying all the time and sending all-caps texts about pretzels. Review: Mike Birbiglia Has a ‘New One.’ It’s Funny Until It Isn’t. 2018-08-03T04:00:00Z

After fertilization, the zygote develops into a blastula, which develops into a planula larva. Fundamentals of Biology 2015-01-01T00:00:00Z

The blastula, which in some species is a hollow ball of cells, undergoes a process called gastrulation, during which the three germ layers form. Concepts of Biology 2013-04-25T00:00:00Z

After the cleavage has produced over 100 cells, the embryo is called a blastula. Biology for AP Courses 2022-06-09T00:00:00Z

Just after this—at the mid-late blastula stage—the cells synthesize large RNA molecules, which are believed not to include ribosomal RNA but which are likely to include "messenger" RNA. Transplanted Nuclei and Cell Differentiation, by Sir John B. Gurdon 2012-10-09T23:45:00.177Z

In removing a blastula, you are indeed destroying something, but what exactly — a potential life? After the Mississippi Vote, the 'Personhood' Fight Is Not Going Away 2011-11-10T10:05:35Z

Further cleavage results in a hollow ball of cells called a blastula. Fundamentals of Biology 2015-01-01T00:00:00Z

The cells in the blastula then rearrange themselves spatially to form three layers of cells. Concepts of Biology 2013-04-25T00:00:00Z

Each cell within the blastula is called a blastomere. Biology for AP Courses 2022-06-09T00:00:00Z

Toward the end of the blastula stage "transfer" RNA synthesis is first detected; this is followed a few hours later, during the formation of the gastrula, by the synthesis of ribosomal RNA. Transplanted Nuclei and Cell Differentiation, by Sir John B. Gurdon 2012-10-09T23:45:00.177Z

Consider its mode of division, and the formation of the blastula, gastrula, and germinal layers. The Biological Problem of To-day Preformation Or Epigenesis? The Basis of a Theory of Organic Development 2011-08-29T02:01:04.170Z

After further cell division and rearrangement of existing cells, a 6–32-celled hollow structure called a blastula is formed. Fundamentals of Biology 2015-01-01T00:00:00Z

Our next question concerns the distribution of potentiality, when the embryo is developed further than the blastula stage. Encyclopaedia Britannica, 11th Edition, Volume 9, Slice 3 "Electrostatics" to "Engis" 2011-02-06T03:00:53.093Z

In mammals, the blastula forms the blastocyst in the next stage of development. Biology for AP Courses 2022-06-09T00:00:00Z

The round cluster becomes filled with fluid, and we have a hollow sphere of cells, which I call the blastula. The World's Greatest Books — Volume 15 — Science

The blastula, or hollow sphere of segmentation cells, usually ciliated, was reminiscent of the planæa, an ancestral free-swimming form whose nearest living relation is the spherical Magosphæra. Form and Function A Contribution to the History of Animal Morphology

In other words, the starting point in the development of the frog is a single biological unit; this divides and its products redivide to constitute the many-celled blastula and the double-walled gastrula. The Doctrine of Evolution Its Basis and Its Scope

It has already been shown that in many cases the embryo after cleavage, i.e. the blastula, is an “aequipotential system.” Encyclopaedia Britannica, 11th Edition, Volume 9, Slice 3 "Electrostatics" to "Engis" 2011-02-06T03:00:53.093Z

Here the cells in the blastula arrange themselves in two layers: the inner cell mass, and an outer layer called the trophoblast. Biology for AP Courses 2022-06-09T00:00:00Z

We call this layer the blastoderm, and the sphere itself the blastula, or embryonic vesicle. The Evolution of Man — Volume 2

The common ancestor alike of unsegmented worms and of all segmented types is probably the trochosphere larva, which in the Vertebrates is represented by the simple Keimblase or blastula. Form and Function A Contribution to the History of Animal Morphology

The frog-embryo now represents a modified embryonic vesicle or blastula, with hollow animal half and solid vegetal half. The Evolution of Man — Volume 1

The trophoblast in the blastula contains embryonic stem cells, which arrange themselves into three germ layers. Biology for AP Courses 2022-06-09T00:00:00Z

Figure 34.22 The rearrangement of the cells in the mammalian blastula to two layers—the inner cell mass and the trophoblast—results in the formation of the blastocyst. Biology for AP Courses 2022-06-09T00:00:00Z

In many of the lower animals the blastula is not developed within the foetal membranes, but in the open water. The Evolution of Man — Volume 2

The gastrula, finally, is the two-layered sac formed from the blastula, typically by invagination of its wall. Form and Function A Contribution to the History of Animal Morphology

It is only by this phylogenetic explanation that we can understand the formation and development of the peculiar, and hitherto totally misunderstood, blastula of the mammal. The Evolution of Man — Volume 1

The embryonic stem cells and germ layers originate from the blastocoel present inside the blastula. Biology for AP Courses 2022-06-09T00:00:00Z

The cells in the blastula rearrange themselves spatially to form three layers of cells. Biology for AP Courses 2022-06-09T00:00:00Z

Moreover, in the animals in which we do not find a real palingenetic blastula the defect is clearly due to cenogenetic causes, such as the formation of food-yelk and other embryonic adaptations. The Evolution of Man — Volume 2

Background: A prepared microscope slide of blastula cross-sections will show cells arrested in various stages of the cell cycle. Biology for AP Courses 2022-06-09T00:00:00Z

A nutritive fluid that was secreted from its wall, and passed through the wall of the blastula, now served to feed the embryo, and took the place of the food-yelk. The Evolution of Man — Volume 1

Once you are confident about your identification, begin to record the stage of each cell you encounter as you scan left to right, and top to bottom across the blastula section. Biology for AP Courses 2022-06-09T00:00:00Z

During gastrulation, the blastula folds upon itself to form the three layers of cells. Biology for AP Courses 2022-06-09T00:00:00Z

These important early embryonic processes take place so quickly in the Amphioxus that four or five hours after fecundation, or about midnight, the spherical blastula is completed. The Evolution of Man — Volume 2

Cells in the growing tip of the root rapidly undergo mitosis, just as the whitefish blastula described in Figure 10.10. Biology for AP Courses 2022-06-09T00:00:00Z

The round cavity, filled with fluid, inside the real blastula is the segmentation-cavity. The Evolution of Man — Volume 1

However, opinions still differ considerably as to the real nature of this "provisional gastrula" of the placental and its relation to the blastula into which it is converted. The Evolution of Man — Volume 1

The blastula, which in some species is a hollow ball of cells, undergoes a process called gastrulation, in which the three germ layers form. Biology for AP Courses 2022-06-09T00:00:00Z

The actual ontogenetic development of the gastrula from the blastula furnishes sound evidence as to the phylogenetic origin of the Gastraea from the Blastaea. The Evolution of Man — Volume 2

Thus the gastrulation of the placentals, which diverges most from that of the amphioxus, the primitive form, is reduced to the original type, the invagination of a modified blastula. The Evolution of Man — Volume 1

Also, in every case, the gastrula develops from the blastula by curving or invagination. The Evolution of Man — Volume 1

This is made up of several strata of cells, but it spreads over the yelk-ball, and thus becomes a one-layered blastula. The Evolution of Man — Volume 1

The blastula is often a hollow ball of cells. Biology for AP Courses 2022-06-09T00:00:00Z

In the Amphioxus the earliest and most important embryonic processes take place so rapidly that the blastula is formed in four hours, the gastrula in six, and the typical vertebrate form in twenty-four. The Evolution of Man — Volume 2

As this quantity of food-yelk fills the centre of the ovum before cleavage begins, there is no difference in this respect between the morula and the blastula. The Evolution of Man — Volume 1

As the gastrulation proceeds a large spherical blastula is formed from this peculiar solid amphigastrula of the placental, as we saw in the case of the marsupial. The Evolution of Man — Volume 1

When the blastula is fully formed, we have again in this case the important folding or invagination that determines gastrulation. The Evolution of Man — Volume 1

Gastrulation is the process in which the cells in the blastula rearrange themselves and form three layers of cells. Biology for AP Courses 2022-06-09T00:00:00Z

From it is developed in the same manner in all the Placentals, by repeated cleavage, a multicellular blastula. The Evolution of Man — Volume 2

Nevertheless, the gastrula is formed here, as in the previous cases, by the folding or invagination of the blastula. The Evolution of Man — Volume 1

From this the blastula is developed; the regular bi-convex lens being converted into a disk, like a watch-glass, with thick borders. The Evolution of Man — Volume 1

If we then imagine the yelk it contains to be dissolved and replaced by a clear liquid, we have the characteristic blastula of the higher mammals. The Evolution of Man — Volume 1

Body symmetry is determined at the blastula stage. Biology for AP Courses 2022-06-09T00:00:00Z

By repeated cleavage of it a morula is formed, and from this a blastula, which changes in a very characteristic way into the greatly modified gastrula. The Evolution of Man — Volume 1

The combined force of all these vibrating lashes causes the whole blastula to move about in a rotatory fashion. The Evolution of Man — Volume 1

This real blastula only differs from that of the primitive ova in its chemical composition. The Evolution of Man — Volume 1

I have in my Natural History of Creation given the name of depula to the remarkable intermediate form which appears at the passage of the blastula into the gastrula. The Evolution of Man — Volume 1

After the blastula is formed, where do the embryonic stem cells and germ layers originate? Biology for AP Courses 2022-06-09T00:00:00Z

Formerly this real blastula was generally believed to be equivalent to the embryonic vesicle of the mammal. The Evolution of Man — Volume 1

What is called the "blastula" of the mammal and the real blastula of the amphioxus and many of the invertebrates are totally different embryonic structures. The Evolution of Man — Volume 1

单词	blastula
例句	blastula But before you can say blastula, his wife — he begins by calling her Clo, then just goes with her real name, Jen — is crying all the time and sending all-caps texts about pretzels. Review: Mike Birbiglia Has a ‘New One.’ It’s Funny Until It Isn’t. 2018-08-03T04:00:00Z After fertilization, the zygote develops into a blastula, which develops into a planula larva. Fundamentals of Biology 2015-01-01T00:00:00Z The blastula, which in some species is a hollow ball of cells, undergoes a process called gastrulation, during which the three germ layers form. Concepts of Biology 2013-04-25T00:00:00Z After the cleavage has produced over 100 cells, the embryo is called a blastula. Biology for AP Courses 2022-06-09T00:00:00Z Just after this—at the mid-late blastula stage—the cells synthesize large RNA molecules, which are believed not to include ribosomal RNA but which are likely to include "messenger" RNA. Transplanted Nuclei and Cell Differentiation, by Sir John B. Gurdon 2012-10-09T23:45:00.177Z In removing a blastula, you are indeed destroying something, but what exactly — a potential life? After the Mississippi Vote, the 'Personhood' Fight Is Not Going Away 2011-11-10T10:05:35Z Further cleavage results in a hollow ball of cells called a blastula. Fundamentals of Biology 2015-01-01T00:00:00Z The cells in the blastula then rearrange themselves spatially to form three layers of cells. Concepts of Biology 2013-04-25T00:00:00Z Each cell within the blastula is called a blastomere. Biology for AP Courses 2022-06-09T00:00:00Z Toward the end of the blastula stage "transfer" RNA synthesis is first detected; this is followed a few hours later, during the formation of the gastrula, by the synthesis of ribosomal RNA. Transplanted Nuclei and Cell Differentiation, by Sir John B. Gurdon 2012-10-09T23:45:00.177Z Consider its mode of division, and the formation of the blastula, gastrula, and germinal layers. The Biological Problem of To-day Preformation Or Epigenesis? The Basis of a Theory of Organic Development 2011-08-29T02:01:04.170Z After further cell division and rearrangement of existing cells, a 6–32-celled hollow structure called a blastula is formed. Fundamentals of Biology 2015-01-01T00:00:00Z Our next question concerns the distribution of potentiality, when the embryo is developed further than the blastula stage. Encyclopaedia Britannica, 11th Edition, Volume 9, Slice 3 "Electrostatics" to "Engis" 2011-02-06T03:00:53.093Z In mammals, the blastula forms the blastocyst in the next stage of development. Biology for AP Courses 2022-06-09T00:00:00Z The round cluster becomes filled with fluid, and we have a hollow sphere of cells, which I call the blastula. The World's Greatest Books — Volume 15 — Science The blastula, or hollow sphere of segmentation cells, usually ciliated, was reminiscent of the planæa, an ancestral free-swimming form whose nearest living relation is the spherical Magosphæra. Form and Function A Contribution to the History of Animal Morphology In other words, the starting point in the development of the frog is a single biological unit; this divides and its products redivide to constitute the many-celled blastula and the double-walled gastrula. The Doctrine of Evolution Its Basis and Its Scope It has already been shown that in many cases the embryo after cleavage, i.e. the blastula, is an “aequipotential system.” Encyclopaedia Britannica, 11th Edition, Volume 9, Slice 3 "Electrostatics" to "Engis" 2011-02-06T03:00:53.093Z Here the cells in the blastula arrange themselves in two layers: the inner cell mass, and an outer layer called the trophoblast. Biology for AP Courses 2022-06-09T00:00:00Z We call this layer the blastoderm, and the sphere itself the blastula, or embryonic vesicle. The Evolution of Man — Volume 2 The common ancestor alike of unsegmented worms and of all segmented types is probably the trochosphere larva, which in the Vertebrates is represented by the simple Keimblase or blastula. Form and Function A Contribution to the History of Animal Morphology The frog-embryo now represents a modified embryonic vesicle or blastula, with hollow animal half and solid vegetal half. The Evolution of Man — Volume 1 The trophoblast in the blastula contains embryonic stem cells, which arrange themselves into three germ layers. Biology for AP Courses 2022-06-09T00:00:00Z Figure 34.22 The rearrangement of the cells in the mammalian blastula to two layers—the inner cell mass and the trophoblast—results in the formation of the blastocyst. Biology for AP Courses 2022-06-09T00:00:00Z In many of the lower animals the blastula is not developed within the foetal membranes, but in the open water. The Evolution of Man — Volume 2 The gastrula, finally, is the two-layered sac formed from the blastula, typically by invagination of its wall. Form and Function A Contribution to the History of Animal Morphology It is only by this phylogenetic explanation that we can understand the formation and development of the peculiar, and hitherto totally misunderstood, blastula of the mammal. The Evolution of Man — Volume 1 The embryonic stem cells and germ layers originate from the blastocoel present inside the blastula. Biology for AP Courses 2022-06-09T00:00:00Z The cells in the blastula rearrange themselves spatially to form three layers of cells. Biology for AP Courses 2022-06-09T00:00:00Z Moreover, in the animals in which we do not find a real palingenetic blastula the defect is clearly due to cenogenetic causes, such as the formation of food-yelk and other embryonic adaptations. The Evolution of Man — Volume 2 Background: A prepared microscope slide of blastula cross-sections will show cells arrested in various stages of the cell cycle. Biology for AP Courses 2022-06-09T00:00:00Z A nutritive fluid that was secreted from its wall, and passed through the wall of the blastula, now served to feed the embryo, and took the place of the food-yelk. The Evolution of Man — Volume 1 Once you are confident about your identification, begin to record the stage of each cell you encounter as you scan left to right, and top to bottom across the blastula section. Biology for AP Courses 2022-06-09T00:00:00Z During gastrulation, the blastula folds upon itself to form the three layers of cells. Biology for AP Courses 2022-06-09T00:00:00Z These important early embryonic processes take place so quickly in the Amphioxus that four or five hours after fecundation, or about midnight, the spherical blastula is completed. The Evolution of Man — Volume 2 Cells in the growing tip of the root rapidly undergo mitosis, just as the whitefish blastula described in Figure 10.10. Biology for AP Courses 2022-06-09T00:00:00Z The round cavity, filled with fluid, inside the real blastula is the segmentation-cavity. The Evolution of Man — Volume 1 However, opinions still differ considerably as to the real nature of this "provisional gastrula" of the placental and its relation to the blastula into which it is converted. The Evolution of Man — Volume 1 The blastula, which in some species is a hollow ball of cells, undergoes a process called gastrulation, in which the three germ layers form. Biology for AP Courses 2022-06-09T00:00:00Z The actual ontogenetic development of the gastrula from the blastula furnishes sound evidence as to the phylogenetic origin of the Gastraea from the Blastaea. The Evolution of Man — Volume 2 Thus the gastrulation of the placentals, which diverges most from that of the amphioxus, the primitive form, is reduced to the original type, the invagination of a modified blastula. The Evolution of Man — Volume 1 Also, in every case, the gastrula develops from the blastula by curving or invagination. The Evolution of Man — Volume 1 This is made up of several strata of cells, but it spreads over the yelk-ball, and thus becomes a one-layered blastula. The Evolution of Man — Volume 1 The blastula is often a hollow ball of cells. Biology for AP Courses 2022-06-09T00:00:00Z In the Amphioxus the earliest and most important embryonic processes take place so rapidly that the blastula is formed in four hours, the gastrula in six, and the typical vertebrate form in twenty-four. The Evolution of Man — Volume 2 As this quantity of food-yelk fills the centre of the ovum before cleavage begins, there is no difference in this respect between the morula and the blastula. The Evolution of Man — Volume 1 As the gastrulation proceeds a large spherical blastula is formed from this peculiar solid amphigastrula of the placental, as we saw in the case of the marsupial. The Evolution of Man — Volume 1 When the blastula is fully formed, we have again in this case the important folding or invagination that determines gastrulation. The Evolution of Man — Volume 1 Gastrulation is the process in which the cells in the blastula rearrange themselves and form three layers of cells. Biology for AP Courses 2022-06-09T00:00:00Z From it is developed in the same manner in all the Placentals, by repeated cleavage, a multicellular blastula. The Evolution of Man — Volume 2 Nevertheless, the gastrula is formed here, as in the previous cases, by the folding or invagination of the blastula. The Evolution of Man — Volume 1 From this the blastula is developed; the regular bi-convex lens being converted into a disk, like a watch-glass, with thick borders. The Evolution of Man — Volume 1 If we then imagine the yelk it contains to be dissolved and replaced by a clear liquid, we have the characteristic blastula of the higher mammals. The Evolution of Man — Volume 1 Body symmetry is determined at the blastula stage. Biology for AP Courses 2022-06-09T00:00:00Z By repeated cleavage of it a morula is formed, and from this a blastula, which changes in a very characteristic way into the greatly modified gastrula. The Evolution of Man — Volume 1 The combined force of all these vibrating lashes causes the whole blastula to move about in a rotatory fashion. The Evolution of Man — Volume 1 This real blastula only differs from that of the primitive ova in its chemical composition. The Evolution of Man — Volume 1 I have in my Natural History of Creation given the name of depula to the remarkable intermediate form which appears at the passage of the blastula into the gastrula. The Evolution of Man — Volume 1 After the blastula is formed, where do the embryonic stem cells and germ layers originate? Biology for AP Courses 2022-06-09T00:00:00Z Formerly this real blastula was generally believed to be equivalent to the embryonic vesicle of the mammal. The Evolution of Man — Volume 1 What is called the "blastula" of the mammal and the real blastula of the amphioxus and many of the invertebrates are totally different embryonic structures. The Evolution of Man — Volume 1
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