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  • Time Factors  (191)
  • *Ecosystem
  • Mutation
  • Protein Structure, Tertiary
  • American Association for the Advancement of Science (AAAS)  (263)
  • Nature Publishing Group (NPG)
  • 1980-1984  (178)
  • 1975-1979  (85)
Collection
Keywords
Publisher
  • American Association for the Advancement of Science (AAAS)  (263)
  • Nature Publishing Group (NPG)
  • Springer  (14)
Years
Year
  • 1
    Publication Date: 1978-12-22
    Description: Long-term habituation training in Aplysia californica produces a profound depression in the efficacy of synaptic transmission between mechanoreceptor neurons and gill motor neurons. This depression persists for more than 3 weeks. Thus a critical synaptic site for plasticity underlying long-term habituation is the same as that for short-term habituation. For this simple form of learning, short- and long-term memory share a common locus and aspects of a common mechanism: synaptic depression.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Castellucci, V F -- Carew, T J -- Kandel, E R -- New York, N.Y. -- Science. 1978 Dec 22;202(4374):1306-8.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/214854" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Aplysia ; Gills/physiology ; Habituation, Psychophysiologic/*physiology ; Mechanoreceptors/physiology ; Memory/*physiology ; Memory, Short-Term/physiology ; Motor Neurons/physiology ; *Reflex, Monosynaptic ; Retention (Psychology)/physiology ; Synaptic Membranes/physiology ; Synaptic Transmission ; Time Factors
    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
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    American Association for the Advancement of Science (AAAS)
    Publication Date: 1978-02-17
    Description: Intravenous injection of a sublethal dose of lead acetate into a domestic pig resulted in a 4.5-fold increase of guanine in the urine, indicating an impairment in the conversion of guanine to xanthine. This impairment is probably due to the inhibition of guanine aminohydrolase (guanase), since the activity of this enzyme is inhibited by Pb2+ (the inhibition constant being 3.0 X 10(-6)M). Postmortem histological examination revealed concretions of crystalline material in the epiphyseal plate of the femoral head. Extraction of the section containing the concretions showed that they were guanine. The relation of these findings to saturnine gout is discussed.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Farkas, W R -- Stanawitz, T -- Schneider, M -- New York, N.Y. -- Science. 1978 Feb 17;199(4330):786-7.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/622568" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Female ; Femur Head/pathology ; Gout/chemically induced/*metabolism/pathology ; Guanine/*biosynthesis/urine ; Lead/*adverse effects ; Swine ; Time Factors
    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
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    American Association for the Advancement of Science (AAAS)
    Publication Date: 1978-02-17
    Description: Squirrel monkeys synchronized to a 24-hour light-dark cycle show a prominent circadian rhythm in body temperature which is regulated against mild environmental cold exposures throughout the 24-hour day. However, cold exposures produce significant decreases in core body temperature when the circadian rhythms of the animal are free-running in the absence of environmental time cues. Effective thermoregulation appears to require the precise internal synchronization of the circadian timekeeping system.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Fuller, C A -- Sulzman, F M -- Moore-Ede, M C -- New York, N.Y. -- Science. 1978 Feb 17;199(4330):794-6.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/414356" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; *Body Temperature Regulation ; *Circadian Rhythm ; Cold Temperature ; Cues ; *Environment ; Environmental Exposure ; Haplorhini ; Homeostasis ; Male ; Saimiri ; Time Factors
    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
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    American Association for the Advancement of Science (AAAS)
    Publication Date: 1978-06-30
    Description: Malignant neoplasms that develop in 12 recessive-lethal, larval mutants of Drosophila melanogaster are discussed. These mutations affect the adult optic neuroblasts and ganglion-mother cells in the larval brain, the imaginal discs, and the hematopoietic organs. The malignant neoplasms exhibit fast, autonomous growth, loss of the capacity for differentiation, increased mobility and invasiveness, lethality in situ and after transplantation, and histological, fine structural, and karyotypic abnormalities. Intermediate neoplasms are also found. These combine both benign and malignant qualities. They grow in a noninvasive, compact fashion, typical of benign tumors, yet they also exhibit malignant qualities such as fast, autonomous, and lethal growth, loss of differentiation capacity, changes in cellular morphology, and lethal growth after transplantation into wild-type hosts. Thus Drosophila and vertebrate neoplasms show striking similarities.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Gateff, E -- New York, N.Y. -- Science. 1978 Jun 30;200(4349):1448-59.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/96525" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Blood Cells/pathology ; *Cell Transformation, Neoplastic ; Drosophila melanogaster/*genetics/growth & development ; Ecdysone/pharmacology ; Hematopoiesis ; Mutation ; Neoplasm Transplantation ; Neoplasms, Experimental/*genetics/pathology ; Neuroblastoma/genetics/pathology
    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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  • 5
    Publication Date: 1978-09-29
    Description: The Z variant of alpha1-antitrypsin was isolated by a new technique from the liver of a patient homozygous for the Z allele of the protease inhibitor locus. The material was homogenous and antigenically competent but had no protease inhibiting capacity. An interesting correlation was found between the subcellular localization and the carbohydrate composition of the Z variant from liver. Carbohydate analysis of this glycoprotein showed an absence of galactose and sialic acid, an appreciable decrease in N-acetylglucosamine, and an almost twofold increase in mannose residues. These data indicate a considerable slowdown in the processing of the oligosaccharides of liver Z variant. In spite of the absence of sialyl residues, the liver Z varant was microheterogeneous by analytical isoelectric focusing. The isoproteins of liver Z variant coincided with those of asialo M variant in the focusing field.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Hercz, A -- Katona, E -- Cutz, E -- Wilson, J R -- Barton, M -- New York, N.Y. -- Science. 1978 Sep 29;201(4362):1229-32.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/308696" target="_blank"〉PubMed〈/a〉
    Keywords: Amino Acid Sequence ; Carbohydrate Metabolism ; Female ; Galactose/metabolism ; Glycoproteins/genetics ; Homozygote ; Humans ; Liver/metabolism ; Mannose/metabolism ; Middle Aged ; Mutation ; Phenotype ; Sialic Acids/metabolism ; alpha 1-Antitrypsin/*genetics/metabolism
    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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  • 6
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    American Association for the Advancement of Science (AAAS)
    Publication Date: 1978-06-09
    Description: The average length of postpartum amenorrhea reported by breast-feeding women in rural Bangladesh in 1975 was 18 to 20 months. Its duration was found to be only slightly related to maternal nutritional status. There was no evidence of a threshold of weight for height necessary for the resumption of menses postpartum. Factors related to the duration of postpartum amenorrhea were maternal age, socioeconomic status, and supplemental feeding of the infant.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Huffman, S L -- Chowdhury, A K -- Mosley, W H -- New York, N.Y. -- Science. 1978 Jun 9;200(4346):1155-7.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/653359" target="_blank"〉PubMed〈/a〉
    Keywords: Amenorrhea/*etiology ; Body Water/metabolism ; Body Weight ; Female ; Humans ; Infant Nutritional Physiological Phenomena ; *Lactation ; Maternal Age ; Menstruation ; Nutrition Disorders/metabolism ; *Nutritional Physiological Phenomena ; *Postpartum Period ; Pregnancy ; Socioeconomic Factors ; Time Factors
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    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
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  • 7
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    American Association for the Advancement of Science (AAAS)
    Publication Date: 1978-09-15
    Description: Rebound insomnia followed the withdrawal of three benzodiazepine hypnotic drugs, each of which had been administered in a single nightly dose for only short-term periods. The intense worsening of sleep is attributed to the short duration of the action of these drugs. A hypothesis involving benzodiazepine receptors in the brain is proposed in which there is a delay or lag in replacement of endogenous benzodiazepine-like molecules after the abrupt withdrawal of exogenous drugs.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Kales, A -- Scharf, M B -- Kales, J D -- New York, N.Y. -- Science. 1978 Sep 15;201(4360):1039-41.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/684426" target="_blank"〉PubMed〈/a〉
    Keywords: Benzodiazepines/*adverse effects/metabolism ; Brain/metabolism ; Flunitrazepam/adverse effects/metabolism ; Humans ; Hypnotics and Sedatives/*adverse effects/metabolism ; Nitrazepam/adverse effects/metabolism ; Receptors, Drug/drug effects/metabolism ; Sleep Initiation and Maintenance Disorders/*etiology/metabolism ; *Substance Withdrawal Syndrome/metabolism ; Syndrome ; Time Factors ; Triazolam/adverse effects/metabolism
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    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
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  • 8
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    American Association for the Advancement of Science (AAAS)
    Publication Date: 1978-09-22
    Description: Parameters of bone formation and resorption were measured in rats orbited for 19.5 days aboard the Soviet Cosmos 782 biological satellite. The most striking effects were on bone formation. During flight, rats formed significantly less periosteal bone than did control rats on the ground. An arrest line at both the periosteum and the endosteum of flight animals suggest that a complete cessation of bone growth occurred. During a 26-day postflight period, the defect in bone formation was corrected. No significant changes in bone resorption were observed.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Morey, E R -- Baylink, D J -- New York, N.Y. -- Science. 1978 Sep 22;201(4361):1138-41.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/150643" target="_blank"〉PubMed〈/a〉
    Keywords: *Aerospace Medicine ; Animals ; *Bone Development ; Bone Matrix/physiology ; Bone Resorption ; Male ; Periosteum/physiology ; Rats ; *Space Flight ; Specific Pathogen-Free Organisms ; Tetracycline ; Tibia/cytology/growth & development/physiology ; Time Factors ; Weightlessness
    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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  • 9
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    American Association for the Advancement of Science (AAAS)
    Publication Date: 1978-04-21
    Description: The muscle activity of normal ambulatory individuals was recorded continuously for 8-hour (working day) periods. Parameters of activity patterns were defined and numerical outcomes for these parameters were compared across a diverse population of muscles. Several pattern parameters, such as the average percentage of time active, were highly correlated with the percentage of type I fibers of a muscle.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Monster, A W -- Chan, H -- O'Connor, D -- New York, N.Y. -- Science. 1978 Apr 21;200(4339):314-7.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/635587" target="_blank"〉PubMed〈/a〉
    Keywords: Adult ; Electromyography ; Humans ; Male ; *Muscle Contraction ; Muscles/anatomy & histology/*physiology ; Time Factors
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    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
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  • 10
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    American Association for the Advancement of Science (AAAS)
    Publication Date: 1978-01-27
    Description: Near-adult cats, fasted overnight, and given a single meal of a complete amino acid diet without arginine, developed hyperammonemia and showed clinical symptoms of ammonia toxicity within 2 hours. One cat (2.7 kilograms) died 4.5 hours after ingesting only 8 grams of the diet. Since ornithine also prevented hyperammonemia, it appears that the domestic cat cannot synthesize ornithine.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Morris, J G -- Rogers, Q R -- New York, N.Y. -- Science. 1978 Jan 27;199(4327):431-2.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/619464" target="_blank"〉PubMed〈/a〉
    Keywords: Amino Acids/metabolism ; Ammonia/*blood/toxicity ; *Animal Nutritional Physiological Phenomena ; Animals ; Arginine/*deficiency/metabolism ; Cats/*metabolism ; Female ; Male ; Ornithine/metabolism ; Time Factors
    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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