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  • 1
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    Quantitation of transcription and clonal selection of single living cells with beta-lactamase as reporter (1998)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1998-01-24
    Description: Gene expression was visualized in single living mammalian cells with beta-lactamase as a reporter that hydrolyzes a substrate loaded intracellularly as a membrane-permeant ester. Each enzyme molecule changed the fluorescence of many substrate molecules from green to blue by disrupting resonance energy transfer. This wavelength shift was detectable by eye or color film in individual cells containing less than 100 beta-lactamase molecules. The robust change in emission ratio reveals quantitative heterogeneity in real-time gene expression, enables clonal selection by flow cytometry, and forms a basis for high-throughput screening of pharmaceutical candidate drugs in living mammalian cells.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Zlokarnik, G -- Negulescu, P A -- Knapp, T E -- Mere, L -- Burres, N -- Feng, L -- Whitney, M -- Roemer, K -- Tsien, R Y -- NS27177/NS/NINDS NIH HHS/ -- New York, N.Y. -- Science. 1998 Jan 2;279(5347):84-8.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Aurora Biosciences, 11010 Torreyana Road, San Diego, CA 92121, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/9417030" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Cell Line ; Cell Separation/methods ; Clone Cells/*metabolism ; DNA-Binding Proteins/genetics/metabolism ; Drug Evaluation, Preclinical ; Energy Transfer ; Flow Cytometry ; Fluoresceins/metabolism ; Fluorescent Dyes/metabolism ; *Gene Expression ; *Genes, Reporter ; Half-Life ; Humans ; *Lactams ; Muscarinic Agonists/pharmacology ; Muscarinic Antagonists/pharmacology ; NFATC Transcription Factors ; *Nuclear Proteins ; Sensitivity and Specificity ; Spectrometry, Fluorescence ; Transcription Factors/genetics/metabolism ; *Transcription, Genetic ; Transfection ; Tumor Cells, Cultured ; Umbelliferones/metabolism ; beta-Lactamases/*genetics/metabolism ; beta-Lactams/metabolism
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
    Published by American Association for the Advancement of Science (AAAS)
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  • 2
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    Floral iridescence, produced by diffractive optics, acts as a cue for animal pollinators (2009)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 2009-01-03
    Description: Iridescence, the change in hue of a surface with varying observation angles, is used by insects, birds, fish, and reptiles for species recognition and mate selection. We identified iridescence in flowers of Hibiscus trionum and Tulipa species and demonstrated that iridescence is generated through diffraction gratings that might be widespread among flowering plants. Although iridescence might be expected to increase attractiveness, it might also compromise target identification because the object's appearance will vary depending on the viewer's perspective. We found that bumblebees (Bombus terrestris) learn to disentangle flower iridescence from color and correctly identify iridescent flowers despite their continuously changing appearance. This ability is retained in the absence of cues from polarized light or ultraviolet reflectance associated with diffraction gratings.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Whitney, Heather M -- Kolle, Mathias -- Andrew, Piers -- Chittka, Lars -- Steiner, Ullrich -- Glover, Beverley J -- New York, N.Y. -- Science. 2009 Jan 2;323(5910):130-3. doi: 10.1126/science.1166256.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Plant Sciences, University of Cambridge, Downing Street, Cambridge CB2 3EA, UK.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/19119235" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Bees/*physiology ; Color ; Color Perception ; Cues ; *Flowers/cytology ; *Hibiscus/cytology ; *Optical Phenomena ; *Pigmentation ; Pigments, Biological ; Plant Epidermis/cytology ; Pollination ; Spectrum Analysis ; *Tulipa/cytology
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
    Published by American Association for the Advancement of Science (AAAS)
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  • 3
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    Precocity in a tiny titanosaur from the Cretaceous of Madagascar (2016)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 2016-04-23
    Description: Sauropod dinosaurs exhibit the largest ontogenetic size range among terrestrial vertebrates, but a dearth of very young individuals has hindered understanding of the beginning of their growth trajectory. A new specimen of Rapetosaurus krausei sheds light on early life in the smallest stage of one of the largest dinosaurs. Bones record rapid growth rates and hatching lines, indicating that this individual weighed ~3.4 kilograms at hatching. Just several weeks later, when it likely succumbed to starvation in a drought-stressed ecosystem, it had reached a mass of ~40 kilograms and was ~35 centimeters tall at the hip. Unexpectedly, Rapetosaurus limb bones grew isometrically throughout their development. Cortical remodeling, limb isometry, and thin calcified hypertrophic metaphyseal cartilages indicate an active, precocial growth strategy.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Curry Rogers, Kristina -- Whitney, Megan -- D'Emic, Michael -- Bagley, Brian -- New York, N.Y. -- Science. 2016 Apr 22;352(6284):450-3. doi: 10.1126/science.aaf1509. Epub 2016 Apr 21.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Biology and Geology Departments, Macalester College, St. Paul, MN 55105, USA. rogersk@macalester.edu. ; Department of Biology, University of Washington, Seattle, WA 98185-1800, USA. ; Biology Department, Adelphi University, Garden City, NY 11530-0701, USA. ; Department of Earth Sciences, University of Minnesota, Minneapolis, MN 55455-1333, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/27102482" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Body Weight ; *Bone Development ; Bone and Bones/*anatomy & histology ; Calcification, Physiologic ; Cartilage/anatomy & histology/growth & development ; Dinosaurs/*anatomy & histology/*growth & development ; Droughts ; Ecosystem ; Extremities/anatomy & histology/growth & development ; Madagascar ; Starvation/veterinary
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
    Published by American Association for the Advancement of Science (AAAS)
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  • 4
    Electronic Resource
    Electronic Resource
    Surface exposure of phosphatidylserine is associated with the swelling and osmotically-induced fusion of human erythrocytes in the presence of Ca^2^+
    Amsterdam : Elsevier
    Biochimica et Biophysica Acta (BBA)/Biomembranes 1028 (1990), S. 14-20 
    Details
    ISSN: 0005-2736
    Keywords: (Human erythrocyte) ; Calcium ion ; Cell fusion ; Osmotic swelling ; Phosphatidylserine ; Phospholipid asymmetry
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Biology , Chemistry and Pharmacology , Medicine , Physics
    Type of Medium: Electronic Resource
    URL: http://linkinghub.elsevier.com/retrieve/pii/0005-2736(90)90259-Q
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    Paper (German National Licenses)
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