This web site is devoted to the study of polyclad flatworms (Phylum: Platyhelminthes, Class: Turbellaria, Order: Polycladida), a group of large, free-living marine flatworms which are mainly found in tropical coral reefs. Collecting images and data about their occurrence, taxonomy and biology these pages may contribute to our knowledge about biology and distribution of these colourful marine invertebrates. ... [Information of the supplier]
Organelle DB compiles protein localization data from organisms spanning the eukaryotic kingdom and presents an organized catalog of the known protein constituents of more than 50 organelles, subcellular structures, and protein complexes. The data sets in Organelle DB encompass 138 organisms with emphasis on the major model systems: S. cerevisiae, A. thaliana, D. melanogaster, C. elegans, M. musculus, and human proteins as well. In particular, Organelle DB is a central repository of yeast protein localization data, incorporating results from both previous and current (ongoing) large-scale studies of protein localization in Saccharomyces cerevisiae. In addition, we have manually curated several recent subcellular proteomic studies for incorporation in Organelle DB. In total, Organelle DB is a singular resource consolidating our knowledge of the protein composition of eukaryotic organelles and subcellular structures. ... [Information of the supplier]
An understanding of the principles of osmosis, diffusion and concentration gradients can help in gaining an understanding of how fluid moves across the capillary wall. The term ‘Starling’s Forces’ refers to this movement, after the scientist who first described it. Movement of fluid across capillary walls is essential for maintaining a continuous exchange of oxygen and carbon dioxide between the body’s cells and the blood supply. ... [Information of the supplier]
Traditional, pre-cladistic systems placed the flatworms in a single phylum, the Platyhelminthes, subdivided into the classes Turbellaria, Monogenea, Trematoda, and Cestoda. Turbellarians are the largely free-living flatworms---those that don't parasitize other animals---while the other classes encompass the obligate parasites, most of which live in or on the bodies of vertebrates. Turbellaria is, in particular, considered an invalid class because it is not monophyletic. (It is either paraphyletic--that is, having descendants, namely the parasitic classes, that are not classified within it [Ehlers, 1985]; or it could be polyphyletic--that is, having arisen from more than one ancestor, one for the acoels and another for catenulidans and rhabditophorans [Baguñà and Riutort, 2004; Phillipé et al., 2011]). The term "turbellarian" can still be applied to those worms that were formerly classified in the Turbellaria, but the term "Turbellaria" (specifically, the capitalized taxon name) would have to be written in quotation marks to indicate its paraphyletic status. Not all turbellarians are free-living. In recognition of recent proposals based on molecular sequences (particularly of 18s rDNA, some Hox genes, and, most recently, fuller genomic data) the system displayed here treats the Acoelomorpha as separate from the phylum Platyhelminthes. The position and status of Acoelomorpha have been volatile in molecular systematics, some claiming that it itself is paraphyletic, many claiming that it (possibly as separate taxa Acoela and Nemertodermatida) belongs near the base of the animal tree of life, as the most basal bilaterians---that is, the most primitive of any animal phylum outside of the sponges and cnidarians. The most recent genomic study (Phillipé et al., 2011), placed the Acoelomorpha within the Deuterostomia, in a phylum Xenacoelomorpha that includes also the enigmatic sack-like animal Xenoturbella); Xenacoelomorpha is placed as sister group to the Ambulacraria (Ehinoderms + Hemichordata). Significantly, the earlier proposals that Acoelomorpha was the most primitive bilaterian---a controversial claim that did not make sense in terms of the morphology of acoels---are now seen to be a result of a statistical error known as long-branch attraction. The Platyhelminthes, as defined in these molecular systems, would be only distantly related to the Acoelomorpha and classified as a lophotrochozoan phylum. This taxonomic database covers all turbellarian flatworms, including parasitic turbellarians. The position of the major parasitic taxa (the other classes in the traditional system), encompassed now in the taxon Neodermata, is shown as proposed by cladistic systems based on morphological characters (see Baguñà and Riutort, 2004, for summary of other proposed positions of the Neodermata). ... [Information of the supplier]
FlyMove is an internet resource to study the development of the fruit fly Drosophila melanogaster, aimed at university students and teachers of developmental biology classes. It will provide you with a variety of images, movies and interactive Shockwaves, which will facilitate the understanding of complex developmental processes. Each of these media types is marked with a symbol. Images and Movies contain in vivo data as well as graphics and animation, allowing abstraction while keeping closely connected to the organism. Interactive Shockwaves allow to explore developmental processes at your own pace and level. Some virtual experiments are presented, too. ... [Information of the supplier]
This collection of sections through zebrafish embryos at four different stages of development is thought to provide some help to understand how the zebrafish embryo looks inside. Thin section in Araldite were stained with methylene blue. Images were taken and digitized. You will find an overview image for each stage, with links (click at numbers on image) to images of the sections. You can also download high resolution images (JPEG, about 1 MB), which in most cases are good enough to zoom in down to the level of individual cell nuclei. ... [Information of the supplier]
The Ambystoma Genetic Stock Center is a self-sustaining, breeding colony of the Mexican axolotl (Ambystoma mexicanum) supported by the National Science Foundation as a Living Stock Collection under the Division of Biological Infrastructure (DBI) and located in the Department of Biology at the University of Kentucky. The AGSC is a genetic stock center dedicated to the supply of genetically well-characterized axolotl embryos, larvae, and adults to laboratories and classrooms throughout the United States and abroad. ... [Information of the supplier]
The internet Primate Aging Database (iPAD) is a multi-centered, relational database of biological variables in aging, captive nonhuman primates. Through joint initiative of the National Institute on Aging (intramural and extramural programs), National Center for Research Resources (NCRR), and the National Primate Research Center at the University of Wisconsin-Madison (WNPRC), we have organized a database to study biomarkers of aging in nonhuman primates. iPAD also provides an invaluable veterinary and clinical resource, and can generate normative data for numbers of animals across research settings. iPAD now contains over 400,000 data points for body weight, blood chemistry and hematology, for healthy, non-experimental subjects across time. ... [Information of the supplier]
LarvalBase is a comprehensive information system on fish larvae that are relevant in the field of fisheries research and finfish aquaculture, combining traditional sources such as primary and “grey” literature. In addition, data from various sources as Internet and e.g. from practising aquaculturists, even in developing countries, are considered to be valuable for the database. (...) The LarvalBase-Project was started in the beginning of 1998 in close conjunction with FishBase, the largest data base on finfish worldwide (FishBase). However, FishBase holds little information on ichthyoplankton and lacks detailled data on fish larvae identification and rearing. The LarvalBase-Project aimed close these gaps. ... [Information of the supplier, modified]
The Interactive Fly - a cyberspace guide to Drosophila development and metazoan evolution - was first released July/August 1996, with updates provided at approximately one month intervals, through September 1997 (edition 13). Updating quarterly started with edition 14. With edition 40, the Interactive Fly began to schedule updates three times a year: fall, winter and spring. ... [Information of the supplier, modified]
