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  • 1
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    American Association for the Advancement of Science (AAAS)
    Publikationsdatum: 1999-01-08
    Beschreibung: Humans show considerable interindividual variation in susceptibility to weight gain in response to overeating. The physiological basis of this variation was investigated by measuring changes in energy storage and expenditure in 16 nonobese volunteers who were fed 1000 kilocalories per day in excess of weight-maintenance requirements for 8 weeks. Two-thirds of the increases in total daily energy expenditure was due to increased nonexercise activity thermogenesis (NEAT), which is associated with fidgeting, maintenance of posture, and other physical activities of daily life. Changes in NEAT accounted for the 10-fold differences in fat storage that occurred and directly predicted resistance to fat gain with overfeeding (correlation coefficient = 0.77, probability 〈 0.001). These results suggest that as humans overeat, activation of NEAT dissipates excess energy to preserve leanness and that failure to activate NEAT may result in ready fat gain.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Levine, J A -- Eberhardt, N L -- Jensen, M D -- DK45343/DK/NIDDK NIH HHS/ -- DK50456/DK/NIDDK NIH HHS/ -- M01 RR00535/RR/NCRR NIH HHS/ -- New York, N.Y. -- Science. 1999 Jan 8;283(5399):212-4.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Medicine, Endocrine Research Unit, Mayo Clinic and Mayo Foundation, 200 First Street Southwest, Rochester, MN 55905, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/9880251" target="_blank"〉PubMed〈/a〉
    Schlagwort(e): Activities of Daily Living ; *Adipose Tissue ; Adult ; Basal Metabolism ; Body Composition ; Calorimetry, Indirect ; *Energy Intake ; *Energy Metabolism ; Exercise ; Female ; Humans ; Hyperphagia/*physiopathology ; Male ; *Movement ; Posture ; *Weight Gain
    Print ISSN: 0036-8075
    Digitale ISSN: 1095-9203
    Thema: Biologie , Chemie und Pharmazie , Informatik , Medizin , Allgemeine Naturwissenschaft , Physik
    Standort Signatur Erwartet Verfügbarkeit
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  • 2
    Publikationsdatum: 1999-06-26
    Beschreibung: Regulation of circadian period in humans was thought to differ from that of other species, with the period of the activity rhythm reported to range from 13 to 65 hours (median 25.2 hours) and the period of the body temperature rhythm reported to average 25 hours in adulthood, and to shorten with age. However, those observations were based on studies of humans exposed to light levels sufficient to confound circadian period estimation. Precise estimation of the periods of the endogenous circadian rhythms of melatonin, core body temperature, and cortisol in healthy young and older individuals living in carefully controlled lighting conditions has now revealed that the intrinsic period of the human circadian pacemaker averages 24.18 hours in both age groups, with a tight distribution consistent with other species. These findings have important implications for understanding the pathophysiology of disrupted sleep in older people.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Czeisler, C A -- Duffy, J F -- Shanahan, T L -- Brown, E N -- Mitchell, J F -- Rimmer, D W -- Ronda, J M -- Silva, E J -- Allan, J S -- Emens, J S -- Dijk, D J -- Kronauer, R E -- MO1-RR02635/RR/NCRR NIH HHS/ -- P01-AG09975/AG/NIA NIH HHS/ -- R01-GM53559/GM/NIGMS NIH HHS/ -- New York, N.Y. -- Science. 1999 Jun 25;284(5423):2177-81.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Circadian, Neuroendocrine, and Sleep Disorders Section, Division of Endocrinology, Department of Medicine, Harvard Medical School, Brigham and Women's Hospital, 221 Longwood Avenue, Boston, MA 02115, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/10381883" target="_blank"〉PubMed〈/a〉
    Schlagwort(e): Adult ; Aged ; Aging/*physiology ; Biological Clocks/genetics/*physiology ; Body Temperature ; Circadian Rhythm/genetics/*physiology ; Darkness ; Female ; Humans ; Hydrocortisone/blood ; Light ; Male ; Melatonin/blood ; Middle Aged ; Sleep
    Print ISSN: 0036-8075
    Digitale ISSN: 1095-9203
    Thema: Biologie , Chemie und Pharmazie , Informatik , Medizin , Allgemeine Naturwissenschaft , Physik
    Standort Signatur Erwartet Verfügbarkeit
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  • 3
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    American Association for the Advancement of Science (AAAS)
    Publikationsdatum: 1999-01-23
    Beschreibung: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Baker, M -- New York, N.Y. -- Science. 1999 Jan 1;283(5398):16-7.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/9917255" target="_blank"〉PubMed〈/a〉
    Schlagwort(e): Adult ; Bioethics ; *Cloning, Organism ; Embryo Research ; Female ; Government Regulation ; Humans ; Korea ; Nuclear Transfer Techniques ; Research
    Print ISSN: 0036-8075
    Digitale ISSN: 1095-9203
    Thema: Biologie , Chemie und Pharmazie , Informatik , Medizin , Allgemeine Naturwissenschaft , Physik
    Standort Signatur Erwartet Verfügbarkeit
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  • 4
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    American Association for the Advancement of Science (AAAS)
    Publikationsdatum: 1999-11-30
    Beschreibung: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Balter, M -- New York, N.Y. -- Science. 1999 Oct 29;286(5441):890-1.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/10577237" target="_blank"〉PubMed〈/a〉
    Schlagwort(e): Adult ; Child ; Female ; *Fossils ; History, Ancient ; Humans ; Male ; Paleopathology ; Skull/*pathology ; Turkey
    Print ISSN: 0036-8075
    Digitale ISSN: 1095-9203
    Thema: Biologie , Chemie und Pharmazie , Informatik , Medizin , Allgemeine Naturwissenschaft , Physik
    Standort Signatur Erwartet Verfügbarkeit
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  • 5
    Publikationsdatum: 1999-08-24
    Beschreibung: Pig organs may offer a solution to the shortage of human donor organs for transplantation, but concerns remain about possible cross-species transmission of porcine endogenous retrovirus (PERV). Samples were collected from 160 patients who had been treated with various living pig tissues up to 12 years earlier. Reverse transcription-polymerase chain reaction (RT-PCR) and protein immunoblot analyses were performed on serum from all 160 patients. No viremia was detected in any patient. Peripheral blood mononuclear cells from 159 of the patients were analyzed by PCR using PERV-specific primers. No PERV infection was detected in any of the patients from whom sufficient DNA was extracted to allow complete PCR analysis (97 percent of the patients). Persistent microchimerism (presence of donor cells in the recipient) was observed in 23 patients for up to 8.5 years.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Paradis, K -- Langford, G -- Long, Z -- Heneine, W -- Sandstrom, P -- Switzer, W M -- Chapman, L E -- Lockey, C -- Onions, D -- Otto, E -- New York, N.Y. -- Science. 1999 Aug 20;285(5431):1236-41.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Imutran Ltd. (a Novartis Pharma AG company), Post Office Box 399, Cambridge CB2 2YP, UK. khazal.paradis@pharma.novartis.com〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/10455044" target="_blank"〉PubMed〈/a〉
    Schlagwort(e): Adolescent ; Adult ; Aged ; Animals ; Antibodies, Viral/blood ; Child ; Child, Preschool ; Chimera ; DNA, Viral/analysis ; Extracorporeal Circulation ; Female ; *Gammaretrovirus/genetics/immunology/isolation & purification ; Humans ; Immunoblotting ; Islets of Langerhans Transplantation ; Male ; Middle Aged ; RNA, Viral/analysis ; Retrospective Studies ; Retroviridae Infections/diagnosis/*transmission ; Reverse Transcriptase Polymerase Chain Reaction ; Skin Transplantation ; Swine ; *Transplantation, Heterologous/adverse effects ; Tumor Virus Infections/diagnosis/*transmission ; Viremia/diagnosis ; *Zoonoses
    Print ISSN: 0036-8075
    Digitale ISSN: 1095-9203
    Thema: Biologie , Chemie und Pharmazie , Informatik , Medizin , Allgemeine Naturwissenschaft , Physik
    Standort Signatur Erwartet Verfügbarkeit
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  • 6
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    American Association for the Advancement of Science (AAAS)
    Publikationsdatum: 1999-05-13
    Beschreibung: Does the human capacity for mathematical intuition depend on linguistic competence or on visuo-spatial representations? A series of behavioral and brain-imaging experiments provides evidence for both sources. Exact arithmetic is acquired in a language-specific format, transfers poorly to a different language or to novel facts, and recruits networks involved in word-association processes. In contrast, approximate arithmetic shows language independence, relies on a sense of numerical magnitudes, and recruits bilateral areas of the parietal lobes involved in visuo-spatial processing. Mathematical intuition may emerge from the interplay of these brain systems.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Dehaene, S -- Spelke, E -- Pinel, P -- Stanescu, R -- Tsivkin, S -- HD23103/HD/NICHD NIH HHS/ -- New York, N.Y. -- Science. 1999 May 7;284(5416):970-4.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Unite INSERM 334, Service Hospitalier Frederic Joliot, CEA/DSV, 91401 Orsay Cedex, France. dehaene@shfj.cea.fr〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/10320379" target="_blank"〉PubMed〈/a〉
    Schlagwort(e): Adult ; Brain Mapping ; Evoked Potentials ; Female ; Frontal Lobe/*physiology ; Humans ; Intuition ; *Language ; Magnetic Resonance Imaging ; Male ; *Mathematics ; Parietal Lobe/*physiology ; *Thinking
    Print ISSN: 0036-8075
    Digitale ISSN: 1095-9203
    Thema: Biologie , Chemie und Pharmazie , Informatik , Medizin , Allgemeine Naturwissenschaft , Physik
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  • 7
    Publikationsdatum: 1999-09-08
    Beschreibung: A fundamental question about human memory is which brain structures are involved, and when, in transforming experiences into memories. This experiment sought to identify neural correlates of memory formation with the use of intracerebral electrodes implanted in the brains of patients with temporal lobe epilepsy. Event-related potentials (ERPs) were recorded directly from the medial temporal lobe (MTL) as the patients studied single words. ERPs elicited by words subsequently recalled in a memory test were contrasted with ERPs elicited by unrecalled words. Memory formation was associated with distinct but interrelated ERP differences within the rhinal cortex and the hippocampus, which arose after about 300 and 500 milliseconds, respectively. These findings suggest that declarative memory formation is dissociable into subprocesses and sequentially organized within the MTL.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Fernandez, G -- Effern, A -- Grunwald, T -- Pezer, N -- Lehnertz, K -- Dumpelmann, M -- Van Roost, D -- Elger, C E -- New York, N.Y. -- Science. 1999 Sep 3;285(5433):1582-5.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Epileptology, University of Bonn, 53105 Bonn, Germany. gf@mailer.meb.uni-bonn.de〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/10477525" target="_blank"〉PubMed〈/a〉
    Schlagwort(e): Adult ; Analysis of Variance ; Brain Mapping ; Electrodes, Implanted ; Epilepsy, Temporal Lobe/physiopathology ; Evoked Potentials ; Female ; Hippocampus/*physiology ; Humans ; Magnetic Resonance Imaging ; Male ; Memory/*physiology ; Mental Recall/*physiology ; Middle Aged ; Neurons/physiology ; Temporal Lobe/*physiology ; Time Factors
    Print ISSN: 0036-8075
    Digitale ISSN: 1095-9203
    Thema: Biologie , Chemie und Pharmazie , Informatik , Medizin , Allgemeine Naturwissenschaft , Physik
    Standort Signatur Erwartet Verfügbarkeit
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  • 8
    Publikationsdatum: 1999-07-20
    Beschreibung: Intervertebral disc disease is one of the most common musculoskeletal disorders. A number of environmental and anthropometric risk factors may contribute to it, and recent reports have suggested the importance of genetic factors as well. The COL9A2 gene, which codes for one of the polypeptide chains of collagen IX that is expressed in the intervertebral disc, was screened for sequence variations in individuals with intervertebral disc disease. The analysis identified a putative disease-causing sequence variation that converted a codon for glutamine to one for tryptophan in six out of the 157 individuals but in none of 174 controls. The tryptophan allele cosegregated with the disease phenotype in the four families studied, giving a lod score (logarithm of odds ratio) for linkage of 4.5, and subsequent linkage disequilibrium analysis conditional on linkage gave an additional lod score of 7.1.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Annunen, S -- Paassilta, P -- Lohiniva, J -- Perala, M -- Pihlajamaa, T -- Karppinen, J -- Tervonen, O -- Kroger, H -- Lahde, S -- Vanharanta, H -- Ryhanen, L -- Goring, H H -- Ott, J -- Prockop, D J -- Ala-Kokko, L -- AR39740/AR/NIAMS NIH HHS/ -- HG00008/HG/NHGRI NIH HHS/ -- New York, N.Y. -- Science. 1999 Jul 16;285(5426):409-12.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Collagen Research Unit, Biocenter and Department of Medical Biochemistry, University of Oulu, 90220 Oulu, Finland.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/10411504" target="_blank"〉PubMed〈/a〉
    Schlagwort(e): Adult ; Aged ; Alleles ; Amino Acid Substitution ; Case-Control Studies ; Codon ; Collagen/chemistry/*genetics ; *Collagen Type IX ; Female ; Genetic Linkage ; *Genetic Predisposition to Disease ; Humans ; Intervertebral Disc Displacement/*genetics ; Linkage Disequilibrium ; Male ; Middle Aged ; Mutation ; Penetrance ; Polymorphism, Genetic ; Sciatica/*genetics ; Tryptophan/genetics
    Print ISSN: 0036-8075
    Digitale ISSN: 1095-9203
    Thema: Biologie , Chemie und Pharmazie , Informatik , Medizin , Allgemeine Naturwissenschaft , Physik
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  • 9
    Publikationsdatum: 1999-10-26
    Beschreibung: Progressive damage to mitochondrial DNA (mtDNA) during life is thought to contribute to aging processes. However, this idea has been difficult to reconcile with the small fraction of mtDNA so far found to be altered. Here, examination of mtDNA revealed high copy point mutations at specific positions in the control region for replication of human fibroblast mtDNA from normal old, but not young, individuals. Furthermore, in longitudinal studies, one or more mutations appeared in an individual only at an advanced age. Some mutations appeared in more than one individual. Most strikingly, a T414G transversion was found, in a generally high proportion (up to 50 percent) of mtDNA molecules, in 8 of 14 individuals above 65 years of age (57 percent) but was absent in 13 younger individuals.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Michikawa, Y -- Mazzucchelli, F -- Bresolin, N -- Scarlato, G -- Attardi, G -- AG-12117-03/AG/NIA NIH HHS/ -- New York, N.Y. -- Science. 1999 Oct 22;286(5440):774-9.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Division of Biology, California Institute of Technology, Pasadena, CA 91125, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/10531063" target="_blank"〉PubMed〈/a〉
    Schlagwort(e): Adolescent ; Adult ; Aged ; Aged, 80 and over ; Aging/*genetics ; Cell Line ; Child ; Child, Preschool ; DNA Damage ; DNA Repair ; DNA Replication/*genetics ; DNA, Mitochondrial/biosynthesis/chemistry/*genetics ; Fetus ; Fibroblasts ; Humans ; Infant ; Infant, Newborn ; Longitudinal Studies ; Middle Aged ; Mitochondria/*genetics ; Nucleic Acid Conformation ; Nucleic Acid Heteroduplexes ; *Point Mutation ; Polymerase Chain Reaction ; Pseudogenes
    Print ISSN: 0036-8075
    Digitale ISSN: 1095-9203
    Thema: Biologie , Chemie und Pharmazie , Informatik , Medizin , Allgemeine Naturwissenschaft , Physik
    Standort Signatur Erwartet Verfügbarkeit
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  • 10
    Publikationsdatum: 1999-04-02
    Beschreibung: Visual imagery is used in a wide range of mental activities, ranging from memory to reasoning, and also plays a role in perception proper. The contribution of early visual cortex, specifically Area 17, to visual mental imagery was examined by the use of two convergent techniques. In one, subjects closed their eyes during positron emission tomography (PET) while they visualized and compared properties (for example, relative length) of sets of stripes. The results showed that when people perform this task, Area 17 is activated. In the other, repetitive transcranial magnetic stimulation (rTMS) was applied to medial occipital cortex before presentation of the same task. Performance was impaired after rTMS compared with a sham control condition; similar results were obtained when the subjects performed the task by actually looking at the stimuli. In sum, the PET results showed that when patterns of stripes are visualized, Area 17 is activated, and the rTMS results showed that such activation underlies information processing.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Kosslyn, S M -- Pascual-Leone, A -- Felician, O -- Camposano, S -- Keenan, J P -- Thompson, W L -- Ganis, G -- Sukel, K E -- Alpert, N M -- R01 EY12091/EY/NEI NIH HHS/ -- R01 MH57980/MH/NIMH NIH HHS/ -- New York, N.Y. -- Science. 1999 Apr 2;284(5411):167-70.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Psychology, Harvard University, Cambridge, MA 02138, USA. smk@wjh.harvard.edu〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/10102821" target="_blank"〉PubMed〈/a〉
    Schlagwort(e): Adult ; *Brain Mapping ; Humans ; Imagination/*physiology ; Magnetics ; Male ; Memory/physiology ; Tomography, Emission-Computed ; Visual Cortex/*physiology/radionuclide imaging ; Visual Perception/physiology
    Print ISSN: 0036-8075
    Digitale ISSN: 1095-9203
    Thema: Biologie , Chemie und Pharmazie , Informatik , Medizin , Allgemeine Naturwissenschaft , Physik
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