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| | “The Length of Mesoderm Induction in Xenopus is Controlled by Phosphorylation of Smad2” |
 | | Future studies may focus on the process of mesoderm induction under conditions that are true to those found in the actual embryo. | | | This research focuses on discovering the mechanism by which cells of the Xenopus blastulae turn off their responsiveness to the TGF-b family member activin. | | | · The specification map of the early Xenopus blastula shows that no mesoderm is present. |
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http://www.unr.nevada.edu/~matthewg
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| | Analysis of mRNA expression patterns in sea urchin primary mesenchyme cells Anna Dechtiaruk |
| | MTA1 is expressed in the unfertilized egg, disappears during cleavage, is strongly expressed at blastula and gastrula stages, and is downregulated in later development. | | | Frizzled-1 is expressed strongly only at the blastula stage. | | | As part of efforts to determine the function of these sequences in PMCs, we have been utilizing Northern blot analysis to characterize the expression pattern of some of these genes during embryonic development. |
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http://www.susqu.edu/biology/Research/Dechtiaruk.htm
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| | Pharyngula: Differences in the morphology of the blastula |
| | Here, for instance, is what the blastulae of various chordate embryos look like: | | | Biologists have never denied the interesting differences that we see in very early development. | | | This is not a problem for evolutionary biology, which does not consider any stage in development exempt from variation and change. |
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http://www.pharyngula.org/comments/269_0_1_0_C
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| | [No title] |
| | Read through the Mapping of Morphogenetic Movements experiment to get some idea of how fate maps are generated; a lot of work has gone toward their making (be happy we don’t have to repeat that work!). | | | One can therefore postulate that one of the functions of the blastocoel may be to restrict the interaction between future endodermal and future ectodermal cells (although they are "allowed" to interact at the ring surrounding the edges of the blastocoel). | | | In primitive vertebrates and amphibians (little to moderate amounts of yolk) the blastula begins as essentially a single-layer hollow sphere which inpockets to form a double-layered cup. |
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http://www.csc.edu/mathsci/akrejci/BIOL432-532/frog2.htm
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| | ZFIN Blastula Stages |
| | The overall shape then changes little the next several hours, well into the period of gastrulation, but cell rearrangements that begin now seem to occur more rapidly than at any other time in development. | | | During their interphases the YSL nuclei form several rows, some nuclei invariably in the I-YSL. | | | Eventually the blastula acquires a smoothly outlined ellipsoidal shape, as viewed from the side, and the stage is named for this oblong shape. |
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http://zfish.uoregon.edu/zf_info/zfbook/stages/blast_stgs.html
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| | Developmental Biology |
| | Following the neurula stage, the sea urchin form other organs through a process called organogenesis. | | | This produces a triangle-shaped embryo which is motile (driven by ciliary movement). | | | The early gastrula stage may be distinguished from the blastula because of formation of the vegetal plate. |
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http://www.uic.edu/classes/bios/bios100/labs/develop.htm
(1399 words)
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| | Definition of blastula |
| | 1:...indentation that forms early on in a developing [[blastula]]. | | | 24:...stocyst]]''', which must not be confused with the blastula, even though being similar in structure their cel... | | | 4:...embryonal development of animals, discovering the blastula stage of development and the [[notochord]], with... |
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http://www.wordiq.com/search/blastula.html
(408 words)
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| | ZFIN Blastula Period Description |
| | "Stereoblastula" would be more a appropriate term than blastula to describe the period, for it means no blastocoele is present, which is the case (Fig. | | | More accurately, the cleavages during the early blastula period are "metasynchronous" because the mitoses do not all occur at quite the same time. | | | Important processes occur during this blastula period; the embryo enters midblastula transition (MBT), the yolk syncytial layer (YSL) forms, and epiboly begins. |
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http://zfin.org/zf_info/zfbook/stages/blast.html
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| | Embryogenesis - Wikipedia, the free encyclopedia |
| | In mammals blastulation leads to the formation of the blastocyst, which must not be confused with the blastula, even though being similar in structure their cells have different fates. | | | During gastrulation cells migrate to the interior of the blastula, consequently forming two (in diploblastic animals) or three (triploblastic) germ layers, the embryo during this process is called a gastrula. | | | The different cells derived from cleavage (up to the blastula stage) are called blastomeres. |
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http://www.wikipedia.org/wiki/Embryogenesis
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| | ECM 18 |
| | The increased association of ECM 18 mRNA with polysomes from cleavage to mesenchyme blastula is approximately fivefold. | | | The pattern of ECM 18 expression is unique among the extracellular matrix molecules known in this embryo. | | | Immunolocalization experiments detected no ECM 18 protein in eggs and early blastula. |
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http://www.bio.davidson.edu/Courses/genomics/mirror/urchin/u1ecmv.htm
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| | STEM CELL RESEARCH - PearlSoup.com |
| | This tiny sphere is called a blastula, and each one of its cells is still ‘totipotential,’ it has the potential to form a complete human being, just like the original one-celled zygote. | | | The reason there is all this controversy about stem cell research is that a small minority of religious believers contend that the blastula and all its totipotential cells are human beings--- preformed, of course, but still basically human beings, and we should not be allowing, let alone be funding research which destroys human beings. | | | This is basic animal husbandry, employed to breed cattle and varieties of show dogs and work dogs, for example. |
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http://www.pearlsoup.com/index.cfm?fuseaction=pearls.view&pearlID=9630
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| | Cleavage in Amphibians: Cadherins and the Blastula |
| | The organization of the blastula requires the propoer functioning the cadherin-based cell adhesion system. | | | Janet Heasman, Chris Wylie and colleagues have used anti-sense depletion to remove various comonents of this system from the oocyte, resulting in lack of these proteins in the embryo. |
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http://worms.zoology.wisc.edu/frogs/cleavage/cadherin.html
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| | Sea Star Embryology |
| | This ball-like stage is called the blastula (5). | | | During the late blastula stage a few cells on one side of the developing embryo begin to push into the blastocoel (8). | | | Compare the size of the blastula to the original zygote. |
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http://www.jburroughs.org/science/resources/SeaStarembryology/starfishembryology.html
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| | LvNotch |
| | LiCl treatment caused an expansion in the number of presumptive SMCs that lacked LvNotch and in the number of presumptive endoderm cells that express apical LvNotch in mesenchyme blastula embryos. | | | To test the possibility that the specific pattern of the expression of apical LvNotch along the presumptive SMC-endoderm boundary is tied to animal/vegetal axis of the embryo, embryos were treated with LiCl, which increases the amount of vegetally derived tissues (Hostradius, 1973). | | | treatment did not affect the number of cells lacking LvNotch expression in the center of the mesenchyme blastula vegetal plate. |
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http://www.bio.davidson.edu/courses/genomics/mirror/Urchin/u1notc.htm
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| | Overexpression of S-adenosylmethionine decarboxylase (SAMDC) in early Xenopus embryos induces cell dissociation and ... |
| | We suggest that the SAM-deficient embryos obtained in the present study provide a unique system for studying the cellular control mechanism underlying the blastula-gastrula transition. | | | We concluded that in SAMDC-overexpressed embryos a SAM-deficient state was induced, and this caused cell dissociation and inhibition of transition from the blastula to gastrula stage. | | | The SAMDC-over-expressed embryos developed normally until the blastula stage, but at the early gastrula stage cells which received the mRNA dissociated autonomously and stopped synthesizing protein. |
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http://www.ijdb.ehu.es/abstract.julio98/42_5_5.htm
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| | Developmental Mechanisms Problem Set |
| | The sheet of cells in the blastula of a developing animal embryo is called the: |
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http://www.biology.arizona.edu/developmental_bio/problem_sets/Developmental_Mechanisms/09Q.html
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| | Neural induction: toward a unifying mechanism - Nature Neuroscience |
| | At the blastula stage, medial epiblast cells express FGFs but not Wnts. | | | The first clue came from experiments aimed at studying the mechanism of mesoderm formation. | | | and both Wnt and FGF signaling seem to be ongoing in the blastula ectoderm |
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http://www.nature.com/cgi-taf/DynaPage.taf?file=/neuro/journal/v4/n11s/full/nn747.html
(6966 words)
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| | Developmental Mechanisms Problem Set |
| | After the cleavage stage of development, the embryo is a hollow structure called the blastula. | | | In contrast, frog blastulas are very thick near the vegetal pole, and bird blastulas are lens-shaped. | | | Sea urchin blastulas, for example, are simple hollow balls (see illustration to the right). |
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http://www.biology.arizona.edu/developmental_bio/problem_sets/Developmental_Mechanisms/09t.html
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| | Chapter 28 Reading Guide |
| | Match the tissue layer to the part of the body it becomes | | | The cells of animals are organized into functional units called [ blastula / tissues ] | | | In all animals except [ humans / sponges ] a zygote undergoes divisions to become a blastula. |
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http://www.biologycorner.com/worksheets/chapter28.html
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| | Cleavage 1 |
| | Cleavage continues, forming a mass of cells which organizes itself into the blastula. | | | After the 16 cell stage, the cleavages become more difficult to follow, due to the increasing number of cells and to the division of blastomeres becoming asynchronous. | | | Like the early blastula, it is characterized by a single layer of cells surrounding the central hollow area - the blastocoel (B). |
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http://www.uoguelph.ca/zoology/devobio/210labs/cleavage1.html
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| | MORPHOLOGY AND CLEAVAGE DURING EARLY DEVELOPMENT OF SEA URCHINS |
| | The embryo surface is smooth, and at this point the embryo is called an early blastula. | | | Identify at least 5 clearly distinguishable phases (for example: 2 cell, 8 cell, blastula, early gastrulation, late gastrulation). | | | Embryology and imagining of the sea urchin stages of early embryology: Using the microscopes in the lab, examine the slides of early sea urchin development. |
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http://www.rhodes.edu/biology/stinemetz/seaurchin.htm
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| | Sea Urchin Embryo 1-Cell to Blastula |
| | Below is a series of pictures showing early sea urchin embryo development from the 1-cell stage through to the late blastula stage. |
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http://www.luc.edu/depts/biology/dev/urchindv.htm
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| | High proliferation rate characterizes the site of axis formation in the avian blastula-stage embryo |
| | However, our observations have shown a striking difference in the stage XIII blastoderm, in which a relatively high amount of labeled cells were detected all around the posterior region of the area opaca, the marginal zone, Koller's sickle and the epiblast. | | | Directional axis formation, therefore, may be attributed to a region of proliferation in the posterior side of a stage XIII blastoderm. | | | The relatively high proportion of cell divisions observed at the posterior end of a stage XIII blastoderm, the blastula stage of the avian embryo, may be associated with the major developmental ability of this region to initiate an embryonic axis. |
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http://www.ijdb.ehu.es/abstract.enero/42_1_11.htm
(271 words)
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| | The Anatomy of the Embryonic Disc |
| | At this stage, the embryonic disc could also be called the blastula. | | | The embryonic disc is also called the blastoderm, the blastodisc, the disc of blastomeres or, at later stages, the blastula. | | | From this enlarged cross-sectional view of the chick blastula, some important anatomical details are visible and labelled: |
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http://www.uoguelph.ca/zoology/devobio/210labs/embryodisc1.html
(493 words)
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| | Cleavage - The Blastula |
| | Both are attached to the apices of the cells in the wall of the blastula, which extend microvilli into these extracellular matrix layers. | | | The blastula is a hollow ball of cells organized into an epithelial monolayer. | | | Fate mapping studies by Hörstadius, Cameron and Davidson; Wray and McClay; and Logan and McClay allow a fairly detailed map of regions of the blastula that will generate the tissue of the gastrula and larva. |
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http://worms.zoology.wisc.edu/urchins/SUcleavage_blastula.html
(170 words)
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| | blastula - definition of blastula by the Free Online Dictionary, Thesaurus and Encyclopedia. |
| | This information should not be considered complete, up to date, and is not intended to be used in place of a visit, consultation, or advice of a legal, medical, or any other professional. | | | blastula - early stage of an embryo produced by cleavage of an ovum; a liquid-filled sphere whose wall is composed of a single layer of cells; during this stage (about eight days after fertilization) implantation in the wall of the uterus occurs | | | An early embryonic form produced by cleavage of a fertilized ovum and consisting of a spherical layer of cells surrounding a fluid-filled cavity. |
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http://www.thefreedictionary.com/blastula
(178 words)
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| | Sea Urchin Development Basic to Understand Genomic Circuits Chapter |
| | variegatus mesenchyme blastula, viewed from the side, showing ingressing primary, or skeletogenic, mesenchyme cells (PMCs). | | | Regions where specifications have still not yet occurred are shown in white. | | | variegatus mesenchyme blastula processed for scanning electron microscopy and fractured through the vegetal plate to show the process of ingression (from worms.zoology.wisc.edu/urchins/SUgast_ingression.html) |
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http://www.bio.davidson.edu/courses/genomics/method/UrchDev.html
(475 words)
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| | MSN Encarta - Search Results - blastula |
| | Tissue, group of associated, similarly structured cells that perform specialized functions for the survival of the organism (Physiology). | | | How well did we match your search term? | | | Cell (biology) : kinds of cells: blastula cell |
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http://encarta.msn.com/blastula.html
(63 words)
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| | New Page 1 |
| | You will need to identify each stage of mitosis on your slide (if you cannot find all phases on your slide move to another slide). | | | (Explanation of what a blastula is: a hollow ball of cells that occurs in early stages of development of a fertilized egg; consists of undifferentiated cells). | | | Once finished the students will return to the classroom. |
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http://www.gettysburg.edu/~lineje01/education/lessonplan2.htm
(625 words)
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| | The Cloning of Tadpoles |
| | The blastula nuclear genome was directing the development of the new embryo up to the tadpole stage. | | | The blastula stage donor nucleus was removed from the embryo blastomere using a micropipet and then microinjected into the enucleated egg cytoplasm. | | | Briggs and King (1952) used nuclei from Blastula stage embryos. |
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http://www.luc.edu/depts/biology/dev/frclone.htm
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| | Revisiting Blastula : Exploring Essential Information, Data and Explanation. |
| | Revisiting Blastula : Exploring Essential Information, Data and Explanation. | | | Does the Blastula modulo Saul_Kripke play here at all? | | | Yet another Einstein saying: "Nothing will benefit human health and increase chances for survival of life on Earth as much as the evolution to a vegetarian diet." |
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http://www.llpoh.org/Biology_Update/Blastula.html
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| | Allwords.com Definition of blastula |
| | A hollow sphere of cells, one cell thick, formed during the division process early in the development of a multicellular embryo. | | | Your Query of 'blastula' Resulted in 1 Matches |
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http://www.allwords.com/word-blastula.html
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| | Chapter 47 - Animal Development |
| | Name some organs or tissues that develop from each of the embryonic germ layers. | | | How does the blastula differ from the gastrula? | | | How is this demonstrated during the formation of the embryo? |
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http://www.cofc.edu/~petersj/(47)_Animal_Development.htm
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| | Gastrulation in Amphibians: Late Blastula Structure |
| | The late blastula Xenopus embryo has morphologically distinct regions that are important for understanding gastrulation. | | | These include the marginal zone (shown in red), the veghetal base (big yolky cells shown in yellow) and the animal cap (blue). |
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http://worms.zoology.wisc.edu/frogs/cleavage/late_blast.html
(74 words)
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| | Embryology - Quiz |
| | Question 3: The image is that of : | | | Question 2: Which of the following has stages arranged in the sequence in which they occur ? | | | ] (a) bipinnaria - -> blastula - - > fetus |
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http://samson.kean.edu/~breid/demo17.htm
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| | LabBench |
| | Select each dividing cell in the micrograph of the whitefish blastula below to see an enlarged drawing of that stage. |
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http://www.phschool.com/science/biology_place/labbench/lab3/field.html
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| | Energy Citations Database (ECD) - Energy and Energy-Related Bibliographic Citations |
| | Availability information may be found in the Availability, Publisher, Research Organization, Resource Relation and/or Author (affiliation information) fields and/or via the "Full-text Availability" link. | | | Energy Citations Database (ECD) Document #7354991 - Sea urchin blastula: extent of cellular determination |
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http://www.osti.gov/energycitations/product.biblio.jsp?osti_id=7354991
(83 words)
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| | Xenbase: Fate Maps |
| | tissue maps - select a tissue and its origins in a 32-cell blastula will be graphically displayed | | | dynamic display - pass your mouse cursor over a cell and its blastula and gastrula decendants will be graphically displayed |
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http://www.xenbase.org/atlas/fate.html
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| | Danny Gatton, Leo Kottke, and Blastula |
| | Our culture's at a point where the description American roots guitar music can apply to so much, from the blazing neo-rockabilly of the late Danny Gatton to the blues-inspired acoustic picking of Leo Kottke to the industrial modernist roar and drone of John Myers's all-guitar quartet Blastula. | | | Not all roots music runs to an ancient heritage, though the argument could be made for composers from Stravinsky to John Cage as inspiring spirits. | | | Finally, there's Blastula (Atavistic), from Glenn Branca Ensemble veteran John Myers and three fellow guitarists. |
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http://www.bostonphoenix.com/alt1/archive/music/reviews/09-26-96/REX/REAL_ROOTS.html
(451 words)
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| | blastula : Definition |
| | Search for blastula in these other databases too | | | An early developmental stage of vertebrate embryos formed by cleavage of the fertilized egg, in which the embryo consists of a single layer of cells surrounding a cavity (the blastocoel). |
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http://www.biology-text.com/definition.php?word=blastula
(49 words)
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