Articles avec #organismes de laboratoire
Nice illustrated explanation (it's funny how is censored the flies mating. Why?)
The Copernicus Atmosphere Monitoring Service (CAMS) provides continuous data and information on atmospheric composition. The service describes the current situation, forecasts the situation a few days ahead, and analyses consistently retrospective data records for recent years.
Insights into spawning behavior and development of the European amphioxus (Branchiostoma lanceolatum).
Fuentes M1, Benito E, Bertrand S, Paris M, Mignardot A, Godoy L, Jimenez-Delgado S, Oliveri D, Candiani S, Hirsinger E, D'Aniello S, Pascual-Anaya J, Maeso I, Pestarino M, Vernier P, Nicolas JF, Schubert M, Laudet V, Geneviere AM, Albalat R, Garcia Fernandez J, Holland ND, Escriva H.
1Laboratoire Arago, UMR7628 CNRS, University Pierre and Marie Curie-Paris6 Banyuls sur Mer, F-66650, France.
The cephalochordate amphioxus (Branchiostoma sp.) is an important animal model for studying the evolution of chordate developmental mechanisms. Obtaining amphioxus embryos is a key step for these studies. It has been shown that an increase of 3-4 degrees C in water temperature triggers spawning of the European amphioxus (Branchiostoma lanceolatum) in captivity, however, very little is known about the natural spawning behavior of this species in the field. In this work, we have followed the spawning behavior of the European amphioxus during two spawning seasons (2004 and 2005), both in the field and in captivity. We show that animals in the field spawn approximately from mid-May through early July, but depending on the year, they show different patterns of spawning. Thus, even if temperature has a critical role in the induction of the spawning in captivity, it is not the major factor in the field. Moreover, we report some improvements on the methodology for inducing spawning in captivity (e.g. in maintenance, light cycle control and induction of spawning in a laboratory without running sea water system). These studies have important implications for amphioxus animal husbandry and for improving laboratory techniques to develop amphioxus as an experimental animal model.
Download the publication here
The Global Soil Biodiversity Initiative was launched in September 2011 and is open to all those interested in developing a coherent platform for promoting the translation of expert knowledge on soil biodiversity into environmental policy and sustainable land management for the protection and enhancement of ecosystem services.
This unique Science Education collection features three model organisms commonly used in life sciences research: S. cerevisiae (Baker’s Yeast), D. melanogaster (the fruit fly), and C. elegans (nematode roundworm). In addition to discussing the current and historical significance of these organisms, the collection includes concepts and methodology relating to how they are maintained and reproduce in the laboratory.
The CAS Diatom Collection Web Site is an ongoing project to present taxonomic
information, images, records of collections, and references pertaining to diatoms. This work has been supported in part by grants BSR-9017609 and DEB-9505269 from the National Science
Types Catalogue provides information on types in the CAS collection.
Hanna Database provides information on the Specimen, Samples, and Publication tables. The Specimen table contains 75,000 records of specimens that have been identified on slides. The Sample table contains detailed information on 29,000 samples accessioned in the Diatom Collection. The Publication table contains 12,000 bibliographic references.
Diatom identification resources
Currently, the project focuses on recent freshwater diatoms of the United States. In the future, it will include marine and fossil taxa with an expanded geographic range.
Freshwater Diatom Identification and Information Resource includes images, keys, and a variety of collection, literature and distribution information to facilitate our understanding of freshwater diatom biodiversity, systematics, and evolution.
Catalogue of diatoms
The Catalogue of Diatom Names is a compilation of names of diatom genera, species and taxa at infraspecific ranks (64,000 names). It has been assembled during the past 12 years by staff at the California Academy of Sciences. It includes all scientific names of diatom genera, species, and taxa at infraspecific ranks, with authorship, date, place of publication, page of description, basionym or replaced name (if applicable), status (valid or invalid), and occasionally type information.
North American Diatom Symposium
Great Lakes Diatoms - Useful for images and information on freshwater diatoms.
Center for Algal Microscopy & Image Digitization - Bowling Green State University
Seaweed - Covers all aspects of seaweed and marine biology.
Paleolimnology and Diatom Home Pages - Indiana University. Links of interest to diatomists and paleolimnologists concerning professional announcements, journals, societies, and listservers.
The Loras College Freshwater Diatom Culture Collection - Diatom culture collection containing over 1,200 cultures at reasonable cost.
Index Nominum Algarum (INA). Bibiographia Phycologica Universalis (BPU) - The INA is a card file maintained by Paul Silva at the Herbarium of the University of California . It contains nearly 200,000 names of algae (in the broad sense). The BPU is a card file containing bibliographic references pertaining to algal taxonomy.
Index Nominum Genericorum (Plantarum) - A compilation of generic names published for all organisms covered by the International Code of Botanical Nomenclature.
Peter Bostock's Home Page - A site for translation of botanical Latin.
International Society of Diatom Research - A site for information about the society and its events.
The Farlow diatom Collection at
Other links from Botany Dept, Univ Hawai'i at Manoa:
|Diatoms, UC Berkeley||Phytoplankton overview|
|The Diatom homepage (University of Indiana)||Pictures of temperate diatoms|
|Experiments in phytoplankton growth: in the field and in the lab||Phytoplankton ecology in Florida|
|Domoic acid as a toxin||Red tides in Texas|
|What are red tides?||Manatees linked to red tides|
|Dinoflagellates, UC Berkeley||Global change and your health|
|Tropical dinoflagellates (University of Tsukuba)||Coral bleaching; Belizean reefs bleach|
Dans un précédent article, je présentais le programme américain Tox21 qui a pour objectif d’évaluer rapidement la toxicité de milliers de substances chimiques. Une des approches de ce programme est l’utilisation du vers Caenorhabditis elegans comme modèle animal pour mesurer la toxicité de ces substances. Cet organisme, qui adulte mesure 1 mm, est un modèle très intéressant car plusieurs travaux laissent penser que les réponses observés chez ce vers (e.g. expression de gènes,…) pourraient être similaires chez les organismes supérieurs. Ce projet, appelé WormTox, est dirigé par le chercheur Jonathan Freedman.
Pour plus d'informations (en anglais) :
* Boyd WA, McBride SJ, Rice JR, Snyder DW, Freedman JH (2010) A high-throughput method for assessing chemical toxicity using a Caenorhabditis elegans reproduction assay. Toxicol Appl Pharmacol, 245(2):153-9.
Caenorhabditis elegans (nematod) is a good laboratory model to behavioral studies. In this publication, basic considerations for behavioral assays are very briefly examined. Both general considerations and admonitions relevant to C. elegans behavioral assays are included. Specific protocols for behavioral assays contributed by individual researchers follow this more general introduction.
Author: Hart, Anne C., ed. Behavior (July 3, 2006), WormBook, ed. The C. elegans Research Community, WormBook, doi/10.1895/wormbook.1.87.1, http://www.wormbook.org/
Caenorhabditis elegans is one of the principle models used to study aging because of its excellent genetics and short lifespan of three weeks. More recently, C.elegans has emerged as a model organism for phenotype based drug screens because of its small size and its ability to grow in microtiter plates.
This publication and video presented an assay to measure C.elegans lifespan in 96 well microtiter plates. The assay was developed and successfully used to screen large libraries for molecules that extend C.elegans lifespan.