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  • 1
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    American Association for the Advancement of Science (AAAS)
    Publication Date: 2002-10-19
    Description: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Keimer, B -- Sackmann, E -- Withers, P J -- New York, N.Y. -- Science. 2002 Oct 18;298(5593):543.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Max-Planck-Institute for SolidState Research, 70569 Stuttgart, Germany. b.keimer@fkf.mpg.de〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/12386318" target="_blank"〉PubMed〈/a〉
    Keywords: Biophysical Phenomena ; *Biophysics ; *Engineering ; *Neutrons ; Physical Phenomena ; *Physics ; Proteins/chemistry ; *Research
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
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  • 2
    Publication Date: 2008-05-24
    Description: Taguchi et al. (Reports, 20 July 2007, p. 369) reported that mice heterozygous for a null mutation in insulin receptor substrate-2 (Irs2) display a 17% increase in median life span. However, using the same mouse model, we find no evidence for life-span extension and suggest that the findings of Taguchi et al. were due to atypical life-span profiles in their study animals.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Selman, Colin -- Lingard, Steven -- Gems, David -- Partridge, Linda -- Withers, Dominic J -- New York, N.Y. -- Science. 2008 May 23;320(5879):1012; author reply 1012. doi: 10.1126/science.1152366.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Centre for Diabetes and Endocrinology, Department of Medicine, University College London, Rayne Institute, 5 University Street, London WC1E 6JJ, UK.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/18497277" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Brain/*metabolism ; Crosses, Genetic ; Diet ; Female ; Homeostasis ; Insulin Receptor Substrate Proteins ; Intracellular Signaling Peptides and Proteins/genetics/*metabolism ; Kaplan-Meier Estimate ; *Longevity ; Male ; Mice ; Mice, Inbred C57BL ; Mutation ; Phosphoproteins/genetics/*metabolism ; Research Design ; Signal Transduction
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
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  • 3
    Publication Date: 2009-10-03
    Description: Caloric restriction (CR) protects against aging and disease, but the mechanisms by which this affects mammalian life span are unclear. We show in mice that deletion of ribosomal S6 protein kinase 1 (S6K1), a component of the nutrient-responsive mTOR (mammalian target of rapamycin) signaling pathway, led to increased life span and resistance to age-related pathologies, such as bone, immune, and motor dysfunction and loss of insulin sensitivity. Deletion of S6K1 induced gene expression patterns similar to those seen in CR or with pharmacological activation of adenosine monophosphate (AMP)-activated protein kinase (AMPK), a conserved regulator of the metabolic response to CR. Our results demonstrate that S6K1 influences healthy mammalian life-span and suggest that therapeutic manipulation of S6K1 and AMPK might mimic CR and could provide broad protection against diseases of aging.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Selman, Colin -- Tullet, Jennifer M A -- Wieser, Daniela -- Irvine, Elaine -- Lingard, Steven J -- Choudhury, Agharul I -- Claret, Marc -- Al-Qassab, Hind -- Carmignac, Danielle -- Ramadani, Faruk -- Woods, Angela -- Robinson, Iain C A -- Schuster, Eugene -- Batterham, Rachel L -- Kozma, Sara C -- Thomas, George -- Carling, David -- Okkenhaug, Klaus -- Thornton, Janet M -- Partridge, Linda -- Gems, David -- Withers, Dominic J -- BBS/E/B/0000C236/Biotechnology and Biological Sciences Research Council/United Kingdom -- BBS/E/B/0000M979/Biotechnology and Biological Sciences Research Council/United Kingdom -- G0800339/Medical Research Council/United Kingdom -- G108/551/Medical Research Council/United Kingdom -- MC_U117531708/Medical Research Council/United Kingdom -- MC_U120027537/Medical Research Council/United Kingdom -- MC_U120097114/Medical Research Council/United Kingdom -- Biotechnology and Biological Sciences Research Council/United Kingdom -- Medical Research Council/United Kingdom -- Wellcome Trust/United Kingdom -- New York, N.Y. -- Science. 2009 Oct 2;326(5949):140-4. doi: 10.1126/science.1177221.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Institute of Healthy Ageing, Centre for Diabetes and Endocrinology, Department of Medicine, University College London, London WC1E 6JJ, UK.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/19797661" target="_blank"〉PubMed〈/a〉
    Keywords: AMP-Activated Protein Kinases/metabolism ; Adipose Tissue, White/metabolism ; Aging/*physiology ; Animals ; Bone Density ; Caloric Restriction ; Female ; Gene Deletion ; Gene Expression ; Gene Expression Regulation ; Insulin/metabolism ; Liver/metabolism ; Longevity/*physiology ; Male ; Mice ; Mice, Inbred C57BL ; Motor Activity ; Muscle, Skeletal/metabolism ; Protein Kinases/metabolism ; Ribosomal Protein S6 Kinases, 90-kDa/genetics/*metabolism ; *Signal Transduction ; T-Lymphocyte Subsets/immunology ; TOR Serine-Threonine Kinases ; Transcription, Genetic
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
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  • 4
    Publication Date: 2016-11-03
    Description: A wide spectrum of tomographic techniques now exists for studying palaeontological specimens, but the suitability of these methods for assessing Earth's oldest prokaryotic life has not been comprehensively investigated. We evaluated the ability of X-ray computed tomography – specifically X-ray microtomography – to reveal the morphology and petrological context of Precambrian microfossils, pseudofossils and biosedimentary structures, all of which are important in the origin and early evolution of life of Earth. The materials tested came from the Pilbara Craton of Western Australia (the 3.49 Ga Dresser Formation, the 3.46 Ga Apex chert and the 3.43 Ga Strelley Pool Formation) and the 1.88 Ga Gunflint Formation of Ontario, Canada. These units chart key developments in palaeobiology. The oldest formations contain profoundly controversial microfossil-like objects and microbially-induced sedimentary structures, whereas definitive prokaryotes are found in the youngest formations. We demonstrate that the imaging of individual microfossils and pseudofossils currently lies at the limits of the capabilities of laboratory-based X-ray microtomography and requires beneficial taphonomy. However, microtomography does provide a good overview of their petrological context at flexible spatial scales, although the quality of the data obtained from mesoscopic microbially-induced sedimentary structures and stromatolites depends largely on their style of preservation. Supplementary material: A zipped Drishti volume for all CT scans, a 0.7z split zip file of one Drishti volume and a HDMI supplementary movie showing digital visualizations for all of the scans are available at http://doi.org/10.5281/zenodo.58161
    Print ISSN: 0305-8719
    Electronic ISSN: 2041-4927
    Topics: Geosciences
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