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| | JOHANNES HOLTFRETER |
 | | The thesis subject was the development of the liver and pancreas of the frog embryo, and Holtfreter commented that this subject was not of great interest to Spemann or himself. | | | During this time, he shared a laboratory bench with Hilde Mangold (nee Pröscholdt), who was in the process of discovering the amphibian gastrula organizer, a discovery later acknowledged in the award of the 1935 Nobel Prize to Spemann. | | | • Analysis of the three kinds of region-specific morphogenetic activities of cells in the amphibian gastrula and the integration of this information into a unified view of gastrulation (1942-43). |
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http://www.nap.edu/readingroom/books/bio73h/holtfreter.html
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| | [No title] |
| | After laborious and careful research (though this stage is not generally admitted in the same sense as the previous one), a fourth common stage was discovered, and given the name of the Coelomula. | | | To give a few examples, we can infer from the fact that the human ovum is a simple cell that the first ancestor of our species was a tiny unicellular being, something like the amoeba. | | | This is the gastrula (stomach) stage, and the process of its formation is called gastrulation. |
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http://www2.cddc.vt.edu/gutenberg/etext04/vlmn110.txt
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| | ZFIN Gastrula Period Description |
| | Hence, the embryonic shield, in terms of its inductive role demonstrated in these experiments, its dorsal marginal position in the embryo, and the fates it eventually generates, is broadly equivalent to the amphibian organizer region of Spemann. | | | The hypoblast gives rise to derivatives classically ascribed to both the mesoderm and endoderm; Thisse et al. | | | Just as there was no blastocoele during the blastula period, there is no archenteron in the gastrula. |
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http://zfin.org/zf_info/zfbook/stages/gast.html
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| | The Organizer Experiment: Transplantation of the Upper Lip of the Blastopore |
| | With a glass needle, make two flat wide groves in the agar bottom, they should be close together, so that both embryos are in the visual field. | | | The organizer experiment represents the classical case of a complex induction. | | | The self differentiating transplant and the induced host structures together formed a well integrated set of secondary axial and paraxial structures, with its own polarity and bilateral symmetry, approaching a complete secondary embryo at the ventral region of the zoo embryo. |
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http://bio.p9.org.uk/4.html
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| | Gallery of Echinoderm Larvae |
| | This means that echinoderms are more related to us humans than you might think. | | | Since all these gastrulas look alike it is not yet possible to determine whether this is becoming a starfish, sea-urchin of other echinoderm. | | | When the eggs develop into a so-called gastrula you can see the anus being formed from the opening. |
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http://www.microscopy-uk.org.uk/mag/artjul00/echino3.html
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| | Animal Development (starfish), Laboratory Notes in BIO 1003 |
| | The larva is a ciliated form in which you can see a mouth, digestive system, and anus. | | | gastrula in which the surface pushes into the interior at a point called the blastopore to form a tube that will become the digestive system. | | | This slide shows the early developmental stages from single cell through early gastrula. |
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http://darwin.baruch.cuny.edu/bio1003/development.html
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| | 27 |
| | Internal organization of tissues and organs results in external changes in form by organogenesis and morphogenesis. | | | Gastrula has the three germinal layers from which all tissues and organs are derived. | | | Gastrula: Further rearrangement of cells converts the blastula into a three-layered structure with a new cavity (archenteron) and is called gastrula. |
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http://www.nos.org/bio12/b4h27.1.htm
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| | fig2 |
| | An internal view of an early gastrula stage S. tropicalis embryo. | | | Variant gastrula stage X. laevis embryos in which the involuting marginal zone (arrowheads) forms more torward the animal and vegetal poles, respectively, than in the normal case. | | | Early gastrula stage (10-) S. tropicalis embryo in which bottle cell formation at the dorsal lip of the blastopore can be observed as a darkly pigmented area (arrowhead). |
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http://faculty.virginia.edu/xtropicalis/data/fig2.html
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| | Optiverse Slide Gallery |
| | These three images show the 2-fold eversion near the time pairs of triple points are created, in a close up, a solid view, and a gapped view highlighting the double-locus. | | | Then we see a stage shortly after the creation of two pairs of triple points (towards the upper right and lower left). | | | These images are from the flythrough scene, showing interior views of the 2-fold eversion around the time the triple points appear. |
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http://new.math.uiuc.edu/optiverse/images.html
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| | Gastrulation: From Cells to Embryo |
| | 49 The Extracellular Matrix of the Deuterostome Gastrula | | | Prospective areas and morphogenetic movements of the deep layer. | | | Prospective areas and morphogenetic movements of the superficial layer. |
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http://www.gastrulation.org
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| | Jotun |
| | Hence we may derive the discoid gastrula from the gastrula. | | | This takes no direct part in the building of the gastrula, even protruding at the mouth-opening. | | | It has arisen through the accumulation of a store of in contrast to the "formative yelk." Nevertheless, the gastrula is of the blastula. |
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http://www.freetemplate.ws/jo/jotun.html
(569 words)
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| | CMRI Website - Research Units - Embryology |
| | The gastrula organizer is therefore composed of a constantly changing population of cells that are allocated to different parts of the axial mesoderm. | | | The movement of cells derived from the gastrula organizer relative to the morphogenetic movement of the mesoderm during gastrulation from the ES (early-streak) to the EB (early-bud) stage. | | | The profile of genetic activity and the tissue contribution by cells in the organizer change during gastrulation, suggesting that the organizer may be populated by a succession of cell populations with different fates. |
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http://www.cmri.com.au/research/embryology_ego.php
(666 words)
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| | [No title] |
| | GROUP REPORTS Durston (NIDB) Signalling studies We have investigated signalling pathways required for constructing the posterior part of the vertebrate central nervous system (CNS). | | | Investigations of vertebrate axial patterning have emphasised the importance of signals from dorsal mesoderm in the gastrula. | | | The dorsal mesodermal patch of Hox gene expression then comes to be overlain by a matching patch of neurectodermal Hox expression (same gene) This suggests that Hox genes expressed in dorsal mesoderm may induce their own expression in neurectoderm.They may regulate, or even mediate, transformation signals. |
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http://www.biologie.ens.fr/desndn/ce/RTN-CT-2001-00242-Year1.doc
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| | NDI Terminology - gastrula |
| | In human embryos the gastrula stage occurs during the third week, as the embryonic disc becomes trilaminar. | | | The simplest type consists of two layers, the ectoderm and the mesentoderm, and of two cavities, one lying between the ectoderm and the endoderm; the other (the archenteron) formed by invagination so as to lie within the entoderm and having an opening (the blastopore). |
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http://www.ndif.org/Terms/gastrula.html
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| | Evolution of Man, vol 1, The |
| | Nevertheless, it is not difficult to reduce the whole cenogenetic or disturbed development of this amphigastrula to the true palingenetic formation of the archigastrula of the amphioxus. | | | With the formation of the primitive gut our frog-embryo has reached the gastrula stage, though it is clear that this cenogenetic amphibian gastrula is very different from the real palingenetic gastrula we have considered (Figures 1.30 to 1.36). | | | In the growth of this hooded gastrula we cannot sharply mark off the various stages which we distinguish successively in the bell-gastrula as morula and gastrula. |
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http://manybooks.net/pages/haeckeleetext04vlmn110/159.html
(299 words)
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| | Sea Star Embryology |
| | When this process (gastrulation) becomes visible as an indentation, the developing embryo is termed a gastrula (9). | | | This change includes the formation of a digestive system with two openings (mouth (17) and anus (16)). | | | During the late blastula stage a few cells on one side of the developing embryo begin to push into the blastocoel (8). |
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http://www.jburroughs.org/science/resources/SeaStarembryology/starfishembryology.html
(382 words)
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| | Search Results for gastrula - Encyclopædia Britannica |
| | The structures and the relationships among the various parts of a mature plant or animal are usually better understood if the successive developmental stages are studied. | | | During maturation of some animals it evolves into the anus or the mouth; in... | | | After an egg is fertilized, the development of the resulting embryo into a juvenile echinoderm may proceed in a variety of ways. |
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http://www.britannica.com/search?query=gastrula&ct=&fuzzy=N
(313 words)
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| | [No title] |
| | Gastrulation is the process by which the cells of one side of the gastrula begin to move inward. | | | As the gastrula develops, the number of cells continue to increase. | | | The inner most layer of cells of the gastrula is called the endoderm. |
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http://users.rcn.com/aspease/notes/chxxii.doc
(1335 words)
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| | eFGF; marginal zone, blastopore |
| | B is a vegetal view of a cleared early gastrula stage 10.5 embryo (dorsal to the top). | | | A is a vegetal view of an early gastrula stage 10.5 embryo (dorsal to the top). | | | D is a vegetal view of a gastrula stage 11 embryo (dorsal to the top). |
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http://www.xenbase.org/WWW/Marker_pages/earlymeso/eFGF.html
(336 words)
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| | Serial Transplantation of Embryonic Nuclei. |
| | Furthermore, within any given clone the development in the second and later generations were generally of the same type as that observed in the first generation. | | | Chromosome studies on donor embryos in the clonal experiments showed that chromosome number generally remained unchanged at the diploid value (26). | | | In order to determine if the nuclear changes responsible for the deficient development are stable, serial transfers of endoderm nuclei were carried out. |
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http://www.euchromatin.org/King01.htm
(506 words)
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| | ZFIN Gastrula Period Stages |
| | Hence, it is important to distinguish these early gastrula stages by examining the thickness at and along the marginal region of the blastoderm. | | | At this 50%-epiboly stage radial intercalations have produced a blastoderm that is very uniform in thickness (Fig. |
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http://zfin.org/zf_info/zfbook/stages/gast_stgs.html
(963 words)
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| | 257 |
| | We shall easily see that the gastraea theory is thus able to throw a of the chief features of embryonic development, if we take up first psychic apparatus or sensorium and its evolution. | | | This Gastraea; in this long-extinct stem-form the whole body.html">body consisted temporarily in the gastrula; in the Gastraea the simple cutaneous and the simple visceral (gut) layer all the vegetal organs and and it is also the case potentially with the gastrula. | | | The solid foundation of this important thesis is the gastrula.html">gastrula.html">gastrula, the find in the same shape in the most diverse classes of animals. |
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http://www.termsdefined.net/25/257.html
(255 words)
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| | Gastrulation I |
| | On this page, a series of photographs can be seen which follow a microlecithal (oligolecithal) embryo from the early gastrula stage through gastrulation to the early bipinnaria larval stage. | | | When this occurs, the internal layer of cells formed (called the hypoblast or mesendoderm) are the cells which gives rise to the endoderm and mesoderm germ layers. | | | The cells who remain on the outer surface of the gastrula become the epiblast (ectoderm). |
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http://www.uoguelph.ca/zoology/devobio/210labs/gastrulation1.html
(516 words)
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| | Xenopus cDNA Library Information |
| | TISSUE: gastrula (stage 10-13) and neurula (stage 15-18) | | | NAME: X. laevis gastrula stages 10.5, 11.5 mixed |
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http://image.llnl.gov/image/html/xenopuslib_info.shtml
(4213 words)
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| | Kingdom Animalia |
| | The formation of a gastrula, by infolding of the blastocyst in a blastopore, is also common to most animals. | | | A gastrula consists of an inner and outer cell layer. | | | The blastocyst (blastula structure) consists of a single cell layer around a fluid-filled cavity. |
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http://www.sidwell.edu/us/science/vlb5/Labs/Classification_Lab/Eukarya/Animalia
(1196 words)
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| | Glencoe Online Science Quiz Chapter |
| | Animals such as earthworms digest food in a ________. | | | A type of skeleton that can help to prevent water loss and provide protection is called a(n) ___________. | | | The layer of cells on the outer surface of the gastrula is called the __________. |
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http://www.glencoe.com/qe/science.php?qi=2515
(247 words)
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| | Sea Urchin Development Basic to Understand Genomic Circuits Chapter |
| | variegatus late gastrula, viewed from the ventral (oral) side. | | | variegatus late gastrula processed for scanning electron microscopy. | | | Most introductory biology textbooks will cover aspects of sea urchin development and you might want to read that portion of your old textbook. |
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http://www.bio.davidson.edu/courses/genomics/method/UrchDev.html
(475 words)
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| | Gastrula |
| | Teaching Materials; Gastrula; Fertilization; Embryology; Embryo Implantation; Developmental Biology; |
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http://omni.ac.uk/browse/mesh/D005775.html
(112 words)
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| | MSN Encarta - Search Results - gastrula |
| | Exclusively for MSN Encarta Premium Subscribers--quickly search thousands of articles from magazines such as Time, Newsweek, The Atlantic Monthly, and Smithsonian. | | | How well did we match your search term? | | | description of the gastrula, comparative embryology (illustration), diagram of late blastula/early gastrula |
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http://encarta.msn.com/gastrula.html
(41 words)
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| | stagegif |
| | Stage 15 (17 hrs 30 min) Mid gastrula stage | | | Stage 12 (10 hrs 20 min) Pre-early gastrula stage |
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http://biol1.bio.nagoya-u.ac.jp:8000/stage-map.html
(386 words)
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| | Definition of gastrula - Merriam-Webster Online Dictionary |
| | For More Information on "gastrula" go to Britannica.com | | | Get the Top 10 Search Results for "gastrula" | | | Now you can take the Eleventh Edition with you anywhere as Franklin's new Speaking Electronic Handheld! |
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http://www.m-w.com/cgi-bin/dictionary?book=Dictionary&va=gastrula
(71 words)
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| | Roster Etymology Medical Arts Humanities Words and Medwords Word Roots Etymology |
| | Gast Gastr Gaster Gasterophilus Gastralgia Gastrectomy Gastres Gastric Gastrin Gastrinoma Gastritis Gastro Gastroacephalus Gastroamorphus Gastrocele Gastrocnemius Gastrone Gastronome Gastronomy Gastropexy Gastropod Gastroschisis Gastrula | | | Gast Gastr Gaster Gasterophilus Gastralgia Gastrectomy Gastres Gastric Gastricus Gastrin Gastrinoma Gastritis Gastro Gastroacephalus Gastrocele Gastrocnemius Gastrone Gastronome Gastronomy Gastropexy Gastropod Gastroschisis Gastrula | | | Gast Gastr Gaster Gasterophilus Gastralgia Gastrectomy Gastres Gastric Gastricus Gastrin Gastrinoma Gastritis Gastroacephalus Gastroamorphus Gastrocele Gastrocnemius Gastrone Gastronome Gastronomy Gastropexy Gastropod Gastroschisis Gastrula |
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http://www.consultsos.com/pandora/samplebg.htm
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