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  • Articles  (31)
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  • American Association for the Advancement of Science (AAAS)  (30)
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  • Articles  (31)
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  • American Association for the Advancement of Science (AAAS)  (30)
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  • 1
    Electronic Resource
    Electronic Resource
    Effect of fractionation on the enzymatic state and behaviour of enzyme activities in different structural soil units (1987)
    Springer
    Biology and fertility of soils 4 (1987), S. 151-154 
    Details
    ISSN: 1432-0789
    Keywords: Kinetics ; pH activity curves ; Soil enzymes ; Structural soil units ; Thermal stability
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Geosciences , Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Summary The behaviour and state of soil catalase, dehydrogenases, urease and proteases associated with different soil structural fractions were studied. Assays of the enzymatic sensitivity to pH variation, thermal stability and the calculation of kinetics constants of Michaelis were performed. The results indicated that catalase and urease activity in these soils seem to be of the same type, because the activities presented a similar behaviour in the soil fractions studied. However, their state appeared different in each group of soil units. Dehydrogenases showed a similar state and behaviour while proteases were in a different state and behaviour in each soil fraction.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00256989
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  • 2
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    Sodium-calcium exchange in heart: membrane currents and changes in [Ca2+]i (1987)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1987-12-18
    Description: Recordings have been made of changes in intracellular calcium ion concentration ([Ca2+]i) that can be attributed to the operation of an electrogenic, voltage-dependent sodium-calcium (Na-Ca) exchanger in mammalian heart cells. Guinea pig ventricular myocytes under voltage clamp were perfused internally with fura-2, a fluorescent Ca2+-indicator, and changes in [Ca2+]i and membrane current that resulted from Na-Ca exchange were identified through the use of various organic channel blockers and impermeant ions. Depolarization of cells elicited slow increases in [Ca2+]i, with the maximum increase depending on internal [Na+], external [Ca2+], and membrane voltage. Repolarization was associated with net Ca2+ efflux and a decline in the inward current that developed instantaneously upon repolarization. The relation between [Ca2+]i and current was linear, and the slope was made steeper by hyperpolarization.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Barcenas-Ruiz, L -- Beuckelmann, D J -- Wier, W G -- HL29473/HL/NHLBI NIH HHS/ -- New York, N.Y. -- Science. 1987 Dec 18;238(4834):1720-2.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Physiology, University of Maryland School of Medicine, Baltimore.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/3686010" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Calcium/*metabolism ; Carrier Proteins/*physiology ; Cell Membrane/physiology ; Guinea Pigs ; Heart/*physiology ; In Vitro Techniques ; Kinetics ; Membrane Potentials ; Sodium-Calcium Exchanger ; Ventricular Function
    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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    Transformation of rat fibroblasts by FSV rapidly increases glucose transporter gene transcription (1987)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1987-03-20
    Description: Elevation of glucose transport is an alteration common to most virally induced tumors. Rat fibroblasts transformed with wild-type or a temperature-sensitive Fujinami sarcoma virus (FSV) were studied in order to determine the mechanisms underlying the increased transport. Five- to tenfold increases in total cellular glucose transporter protein in response to transformation were accompanied by similar increases in transporter messenger RNA levels. This, in turn, was preceded by an absolute increase in the rate of glucose transporter gene transcription within 30 minutes after shift of the temperature-sensitive FSV-transformed cells to the permissive temperature. The transporter messenger RNA levels in transformed fibroblasts were higher than those found in proliferating cells maintained at the nonpermissive temperature. The activation of transporter gene transcription by transformation represents one of the earliest known effects of oncogenesis on the expression of a gene encoding a protein of well-defined function.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Birnbaum, M J -- Haspel, H C -- Rosen, O M -- AM35430-01/AM/NIADDK NIH HHS/ -- DK 35158/DK/NIDDK NIH HHS/ -- New York, N.Y. -- Science. 1987 Mar 20;235(4795):1495-8.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/3029870" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Avian Sarcoma Viruses ; Cell Division ; Cell Line ; *Cell Transformation, Viral ; Fibroblasts ; Gene Expression Regulation ; Kinetics ; Monosaccharide Transport Proteins/*genetics ; RNA, Messenger/genetics ; Rats ; 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
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    A novel thyroid hormone receptor encoded by a cDNA clone from a human testis library (1987)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1987-11-06
    Description: The c-erbA gene belongs to a multigene family that encodes transcriptional regulatory proteins including the v-erbA oncogene product, steroid hormone receptors, and the vitamin D3 receptor. A v-erbA DNA probe encoding the DNA-binding region of the v-erbA protein was used to screen a human complementary DNA testis library. One of the clones isolated, erbA-T-1, was found to encode a 490-amino acid protein (erbA-T). The erbA-T polypeptide shows high homology with the proteins encoded by both the chicken c-erbA and the human c-erbA-beta genes but is most closely related to the chicken gene. The chicken c-erbA and the human c-erbA-beta genes encode high-affinity receptors for thyroid hormone, and here it is shown that the erbA-T protein binds specifically to 3,5,3'-triiodo-L-thyronine with a dissociation constant of 3.8 +/- 0.2 x 10(-10) M. These data imply that more than one thyroid hormone receptor exists in humans and that these receptors might have different tissue- and gene-activating specificities.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Benbrook, D -- Pfahl, M -- DK-35083/DK/NIDDK NIH HHS/ -- New York, N.Y. -- Science. 1987 Nov 6;238(4828):788-91.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Cancer Research Center, La Jolla Cancer Research Foundation, CA 92037.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/3672126" target="_blank"〉PubMed〈/a〉
    Keywords: Amino Acid Sequence ; *Cloning, Molecular ; DNA/*metabolism ; *Genes ; Humans ; Kinetics ; Male ; Protein Biosynthesis ; *Proto-Oncogenes ; Receptors, Thyroid Hormone/*genetics/metabolism ; Testis/*metabolism ; 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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  • 5
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    Antiarthritic gold compounds effectively quench electronically excited singlet oxygen (1987)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1987-04-03
    Description: Although certain gold [Au(I)] compounds have been used effectively in the treatment of rheumatoid arthritis for some years, the molecular basis for such therapeutic action has been unclear. One possible mechanism of the action of Au(I) compounds is that they protect unsaturated membrane lipids and proteins against oxidative degradation caused by activated phagocytes that are not properly regulated. In this study it has been shown that superoxide ion (O-2.), a product of activated phagocytes, can be oxidized to electronically excited singlet oxygen (O1(2)delta g), an agent that is capable of peroxidation of unsaturated fatty acid derivatives. It has also been shown that antiarthritic Au(I) compounds are effective deactivators of O1(2)delta g with quenching constants on the order of 10(7) M-1 sec-1.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Corey, E J -- Mehrotra, M M -- Khan, A U -- New York, N.Y. -- Science. 1987 Apr 3;236(4797):68-9.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/3563489" target="_blank"〉PubMed〈/a〉
    Keywords: Arthritis, Rheumatoid/drug therapy ; *Auranofin ; Chemistry, Physical ; Humans ; Kinetics ; Lipid Peroxides ; *Oxygen ; Physicochemical Phenomena
    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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  • 6
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    Protein kinase C contains a pseudosubstrate prototope in its regulatory domain (1987)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1987-12-18
    Description: The regulatory domain of protein kinase C contains an amino acid sequence between residues 19 and 36 that resembles a substrate phosphorylation site in its distribution of basic residue recognition determinants. The corresponding synthetic peptide (Arg19-Phe-Ala-Arg-Lys-Gly-Ala25-Leu-Arg-Gln-Lys-Asn-Val-His -Glu-Val-Lys-Asn36) acts as a potent substrate antagonist with an inhibitory constant of 147 +/- 9 nM. It is a specific inhibitor of protein kinase C and inhibits both autophosphorylation and protein substrate phosphorylation. Substitution of Ala25 with serine transforms the pseudosubstrate into a potent substrate. These results demonstrate that the conserved region of the regulatory domain (residues 19 to 36) of protein kinase C has the secondary structural features of a pseudosubstrate and may be responsible for maintaining the enzyme in the inactive form in the absence of allosteric activators such as phospholipids.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉House, C -- Kemp, B E -- New York, N.Y. -- Science. 1987 Dec 18;238(4834):1726-8.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Medicine, University of Melbourne, Repatriation General Hospital, West Heidelberg, Victoria, Australia.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/3686012" target="_blank"〉PubMed〈/a〉
    Keywords: Amino Acid Sequence ; Animals ; Homeostasis ; Kinetics ; Myosin-Light-Chain Kinase/metabolism ; Protein Kinase C/*metabolism ; Substrate Specificity
    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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  • 7
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    Identification of nuclear receptors for VIP on a human colonic adenocarcinoma cell line (1987)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1987-12-11
    Description: Vasoactive intestinal peptide (VIP) is a neuropeptide with broad tissue distribution. Although its precise function is unknown, it is thought to exert its effect, at least in part, by interacting with cell surface receptors. Nuclear receptors for VIP have now been identified by specific binding of 125I-labeled VIP to nuclei of a human colonic adenocarcinoma cell line (HT29) and by cross-linking of 125I-labeled VIP to its receptor on intact nuclei. In contrast, 125I-labeled transferrin shows only background binding to nuclei but significant binding to intact cells. Purity of the isolated nuclei was further substantiated by electron microscopy. The apparent molecular sizes of the VIP--cross-linked nuclear and cell surface receptors are similar but not identical.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Omary, M B -- Kagnoff, M F -- DK07202/DK/NIDDK NIH HHS/ -- DK35108/DK/NIDDK NIH HHS/ -- New York, N.Y. -- Science. 1987 Dec 11;238(4833):1578-81.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Medicine, University of California, San Diego, La Jolla 92093.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/2825352" target="_blank"〉PubMed〈/a〉
    Keywords: Adenocarcinoma/*metabolism/ultrastructure ; Cell Line ; Cell Nucleus/*metabolism/ultrastructure ; Colonic Neoplasms/*metabolism/ultrastructure ; Humans ; Kinetics ; Microscopy, Electron ; Receptors, Gastrointestinal Hormone/*metabolism ; Receptors, Vasoactive Intestinal Peptide ; Vasoactive Intestinal Peptide/*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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  • 8
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    Regulation of bcl-2 proto-oncogene expression during normal human lymphocyte proliferation (1987)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1987-06-05
    Description: The bcl-2 and c-myc proto-oncogenes are brought into juxtaposition with the immunoglobulin heavy chain locus in particular B-cell lymphomas, resulting in high levels of constitutive accumulation of their messenger RNAs. Precisely how the products of the bcl-2 and c-myc genes contribute to tumorigenesis is unknown, but observations that c-myc expression is rapidly induced in nonneoplastic lymphocytes upon stimulation of proliferation raise the possibility that this proto-oncogene is involved in the control of normal cellular growth. In addition to c-myc, the bcl-2 proto-oncogene also was expressed in normal human B and T lymphocytes after stimulation with appropriate mitogens. Comparison of the regulation of the expression of these proto-oncogenes demonstrated marked differences and provided evidence that, in contrast to c-myc, levels of bcl-2 messenger RNA are regulated primarily through transcriptional mechanisms.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Reed, J C -- Tsujimoto, Y -- Alpers, J D -- Croce, C M -- Nowell, P C -- CA-42232/CA/NCI NIH HHS/ -- New York, N.Y. -- Science. 1987 Jun 5;236(4806):1295-9.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/3495884" target="_blank"〉PubMed〈/a〉
    Keywords: Blood Proteins/biosynthesis/drug effects ; Cycloheximide/pharmacology ; Gene Expression Regulation/*drug effects ; Humans ; Interleukin-2/pharmacology ; Kinetics ; Lymphocyte Activation/*drug effects ; Phytohemagglutinins/pharmacology ; Proto-Oncogenes/*drug effects ; RNA, Messenger/blood/drug effects ; Transcription, Genetic/drug effects
    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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    Regional changes in calcium underlying contraction of single smooth muscle cells (1987)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1987-03-27
    Description: The role of calcium in regulating the contractile state of smooth muscle has been investigated by measuring calcium and contraction in single smooth muscle cells with the calcium-sensitive dye fura-2 and the digital imaging microscope. The concentration of free calcium in the cytoplasm increased after stimulation of the cells by depolarization with high potassium or by application of carbachol. Changes in calcium always preceded contraction. The increase in calcium induced by these stimuli was limited to less than 1 microM. Calcium within the nucleus was also subject to a limitation of its rise during contraction. Intranuclear calcium rose from 200 nM at rest to no more than 300 nM while cytoplasmic calcium rose to over 700 nM. These apparent ceilings for both cytoplasmic and intranuclear calcium may result either from negative feedback of calcium on cytoplasmic and nuclear calcium channel gating mechanisms, respectively, or from the presence of calcium pumps that are strongly activated at the calcium ceilings.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Williams, D A -- Becker, P L -- Fay, F S -- AM07807/AM/NIADDK NIH HHS/ -- HL-14523/HL/NHLBI NIH HHS/ -- New York, N.Y. -- Science. 1987 Mar 27;235(4796):1644-8.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/3103219" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Benzofurans ; Bufo marinus ; Calcium/*metabolism ; Carbachol/pharmacology ; Electric Stimulation ; Fura-2 ; Kinetics ; *Muscle Contraction ; Muscle, Smooth/*metabolism ; Potassium/pharmacology ; Software ; Spectrometry, Fluorescence
    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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  • 10
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    Direct demonstration of macula densa-mediated renin secretion (1987)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1987-09-25
    Description: An in vitro method has been used to examine whether secretion of renin from the juxtaglomerular apparatus is affected by changes in the sodium chloride concentration of the tubular fluid at the macula densa. Single juxtaglomerular apparatuses were microdissected from rabbits and the tubule segment containing the macula densa was perfused, while simultaneously the entire juxtaglomerular apparatus was superfused, and the fluid was collected for renin measurement. In this preparation, in which influences from renal nerves and local hemodynamic effects are eliminated, a decrease in the tubular sodium chloride concentration at the macula densa results in a prompt stimulation of the renin release rate.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Skott, O -- Briggs, J P -- DK37448/DK/NIDDK NIH HHS/ -- New York, N.Y. -- Science. 1987 Sep 25;237(4822):1618-20.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/3306925" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Extracellular Space/physiology ; In Vitro Techniques ; Juxtaglomerular Apparatus/cytology/*secretion/ultrastructure ; Kinetics ; Rabbits ; Renin/*secretion ; Sodium Chloride/physiology
    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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