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  • Springer  (14)
  • American Geophysical Union (AGU)
  • Oxford University Press
  • 1995-1999  (14)
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  • 1995  (14)
  • 1
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    Micromechanics of a model heterogeneous material system under compressive loading (1995)
    Springer
    Details
    Publication Date: 1995-12-01
    Print ISSN: 0014-4851
    Electronic ISSN: 1741-2765
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Published by Springer
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  • 2
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    The set of maps $$F_{a,b} :x mapsto x + a + frac{b}{{2pi }}$$ sin(2πx) with any given rotation interval is contractiblewith any given rotation interval is contractible (1995)
    Springer
    Details
    Publication Date: 1995-10-01
    Print ISSN: 0010-3616
    Electronic ISSN: 1432-0916
    Topics: Mathematics , Physics
    Published by Springer
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  • 3
    Electronic Resource
    Electronic Resource
    A partially ordered extention of the integers (1995)
    Springer
    Studia logica 54 (1995), S. 303-332 
    Details
    ISSN: 1572-8730
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics , Philosophy
    Notes: Abstract This paper presents a monotonic system of Post algebras of order ω+ω* whose chain of Post constans is isomorphic with 0≤1≤2≤ ... ≤-3≤-2≤-1. Besides monotonic operations, other unary operations are considered; namely, disjoint operations, the quasi-complement, succesor, and predecessor operations. The successor and predecessor operations are basic for number theory.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01053003
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  • 4
    Electronic Resource
    Electronic Resource
    Comments on “Cyclosporin does not affect the absolute rate of cortical bone resportion at the organ level in the growing rat” (1995)
    Springer
    Calcified tissue international 56 (1995), S. 588-592 
    Details
    ISSN: 1432-0827
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00298596
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  • 5
    Electronic Resource
    Electronic Resource
    A new rapid and reproducible homologous immunoradiometric assay for amino-terminal parathyroid hormone in the rat (1995)
    Springer
    Calcified tissue international 56 (1995), S. 83-87 
    Details
    ISSN: 1432-0827
    Keywords: Immunoradiometric assay ; Parathyroid hormone ; Rat
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine , Physics
    Notes: Abstract Measurement of parathyroid hormone (PTH) in the rat is most often performed with competitive ligand radioimmunoassays (RIA) utilizing heterologous antibodies. We report here the validation of a newly developed homologous immunoradiometric assay (IRMA) for rat PTH. Two different goat antibodies to the amino-terminal sequence of rat PTH are utilized; one is immobilized onto plastic beads to capture the PTH molecules and the other is radiolabeled for detection. To test this new IRMA, 30 Sprague-Dawley rats were randomized into three treatment groups to receive by intraperitoneal injection: (1) saline 1 ml/kg (control); (2) calcium chloride 40 mg/kg (hypercalcemic); and (3) EDTA 300 mg/kg (hypocalcemic). Blood samples were taken at 0, 30, 60, 180, and 300 minutes after administration of the assigned treatment for measurement of ionized calcium (Ca2+) and serum PTH. Most of the variance in PTH levels was found to be due to changes in Ca2+ (r2=0.780, P〈0.0001). There was also a close temporal relationship between the two, with the highest levels of PTH occurring at the same measured time points as the lowest Ca2+, and vice versa. The measured detection limit of the IRMA was 3 pg/ml with intra-and interassay coefficients of variation of 1.74% and 3.07%, respectively. Serial dilutions with pooled rat serum, synthetic rat PTH-(1–34), and synthetic human PTH-(1–34) showed good parallelism with increased specificity for the pooled and synthetic PTH, despite a degree of crossreactivity with hPTH. The assay is able to quantitate rapid changes in PTH, providing all the advantages of IRMA methodology including technical simplicity and speed of performance, and is likely to become a useful tool in investigations of bone, mineral, and renal homeostasis using the rat.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00298749
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  • 6
    Electronic Resource
    Electronic Resource
    Amylin increases bone volume but cannot ameliorate diabetic osteopenia (1995)
    Springer
    Calcified tissue international 56 (1995), S. 54-61 
    Details
    ISSN: 1432-0827
    Keywords: Diabetes mellitus ; Amylin ; Osteoporosis ; Bone mineral metabolism
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine , Physics
    Notes: Abstract Amylin is normally secreted in a regulated fashion by the pancreatic β-cells in parallel with insulin and has been reported to have bone-conserving properties. Type I diabetes mellitus results in a low-turnover osteopenia in the presence of decreased amylin, which is in contrast to type II diabetes where less bone loss, in the presence of high amylin levels, occurs. We investigated the effects of amylin on bone mineral metabolism in normal and dibetic (streptozotocin-induced) rats, in order to ascertain whether amylin would modify the streptozotocin-induced diabetic osteopenia. Tenweek-old male Sprague-Dawley rats were randomized as follows: group A (n=18) received normal saline; group B (n=18) received amylin; group C, diabetic rats (n=23), received normal saline; and group D, diabetic rats (n=23), received amylin. Amylin (100 pmol/100 g b. w.) was administered by a daily subcutaneus injection. Double calceinlabeled tibiae were removed for histomorphometric analysis followed sacrifice on day 19. Results showed no difference in blood ionized calcium between groups. Blood glucose remained above 600 mg/dl in the diabetic animals and was not affected by the administration of amylin. Serum osteocalcin, insulin-like growth factor-1 (IGF-1), parathyroid hormone (PTH), and 1,25 dihydroxyvitamin D [1,25(OH)2D] were significantly lower in the diabetic rats compared with control group A by day 19. Amylin produced higher levels of serum osteocalcin in group B on day 9 (P〈0.05) compared with controls but returned to control values (group A) by day 19; no such change occurred in the diabetic group. Amylin administration did not influence IGF-1, 1,25(OH)2D or PTH levels compared with the untreated animals. Analysis of the bone histomorphometry showed a low-turnover osteopenia in the diabetic animals. Amylin administration resulted in a significant increase in bone volume in the normal rats, group B (P〈0.05), but was unable to significantly alter this parameter in the diabetic animals. In conclusion, amylin has a beneficial effect on the bone metabolism of the rat in vivo by increasing bone volume. It is, however, unable to overcome the osteopenia caused by streptozotocin-induced diabetes mellitus at the doses used in this study.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00298745
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  • 7
    Electronic Resource
    Electronic Resource
    The set of maps $$F_{a,b} :x \mapsto x + a + \tfrac{b}{{2\pi }}$$ sin(2πx) with any given rotation interval is contractiblewith any given rotation interval is contractible (1995)
    Springer
    Communications in mathematical physics 173 (1995), S. 313-333 
    Details
    ISSN: 1432-0916
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics , Physics
    Notes: Abstract Consider the two-parameter family of real analytic maps $$F_{a,b} :x \mapsto x + a + \tfrac{b}{{2\pi }}$$ sin(2πx) which are lifts of degree one endomorphisms of the circle. The purpose of this paper is to provide a proof that for any closed intervalI, the set of mapsF a,b whose rotation interval isI, form a contractible set.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02101236
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  • 8
    Electronic Resource
    Electronic Resource
    Evidence that apoB-100 of low-density lipoproteins is a novelsrc-related protein kinase (1995)
    Springer
    The protein journal 14 (1995), S. 627-631 
    Details
    ISSN: 1573-4943
    Keywords: ApoB-100 ; lipoproteins ; kinase ; domain ; phosphorylation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract Protein-tyrosine kinases of signal transduction pathways occur and function intracellularly. In contrast, the low-density lipoprotein (LDL) particle circulates in plasma, where its function is to solubilize and transport lipid. Recently, several reports showed that LDL may have a role in signal transduction. We have identified a region in the apoB-100 primary structure which shows similarity to Src-homology-1 (SH1) domains, the kinase region of protein-tyrosine kinases. Results obtained in protein kinase assays of highly purified LDL showed that only the apoB-100 was phosphorylated, suggesting that apoB-100 has the capacity to undergo autophosphorylation like known protein-tyrosine kinases. Phosphorylation was not observed for any other apolipoprotein in LDL or for any component of high-density lipoprotein and lipoprotein [a]. Our results suggest that apoB-100 may be a novel and functional member of thesrc protein kinase family.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01886889
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  • 9
    Electronic Resource
    Electronic Resource
    Preparation and properties of stable protonation products of permethylmetallocenecarbaldehydes (M = Fe, Ru, Os) (1995)
    Springer
    Russian chemical bulletin 44 (1995), S. 2382-2389 
    Details
    ISSN: 1573-9171
    Keywords: nonamethylmetallocenecarbaldehydes ; iron ; ruthenium ; osmium ; molecular structure ; intramolecular hydrogen bond ; interionic hydrogen bond ; O-protonation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract The products ofO-protonation of metallocenecarbaldehydes C5Me5MC5Me4CHO (M = Fe, Ru, Os) with HBF4 and CF3COOH were obtained for the first time, the adducts [C5Me5MC5Me4CH(OH)]+BF− being isolated in a pure state. The structures of the adducts depend on the nature of the metal and the anion and are governed by the correlation between their basicities. For example, the Fe-containing adducts have an open fulvenoid structure with an interionic hydrogen bond irrespective of the nature of the anion X (X = BF4 −, CF3COO−). In the case of the Ru- and Os-containing adducts in which the metal atoms are more basic than iron, the competition between the metal atom and the anion for the formation of a hydrogen bond with the OH group is clearly manifested in the IR and1H NMR spectra. In the presence of the weakly basic BF4 − anion, a cyclic structure with an intramolecular M...HO hydrogen bond is formed, while in the presence of a more basic F− or CF3COO− anion. it transforms to the open fulvenoid structure with an interionic hydrogen bond. The structures of the compounds obtained were determined by IR and1H NMR spectra, and the structure of the (C5Me5RuC5Me4CHOH)+...F− salt was proved by X-ray diffraction analysis.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00713612
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  • 10
    Electronic Resource
    Electronic Resource
    Photosynthesis, inorganic plant nutrition, solutions, and problems (1995)
    Springer
    Photosynthesis research 46 (1995), S. 37-39 
    Details
    ISSN: 1573-5079
    Keywords: D.I. Arnon ; plant nutrition ; solution culture ; essentiality ; silicon
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract A brief account is given of the research that D.I. Arnon did before he ventured into the field of photosynthesis, viz. his work on inorganic plant nutrition in the laboratory of D.R. Hoagland. The connection between the two areas is indicated. In his work on plant nutrition Dr Arnon emphasized the role of specific nutrients and, with P.R. Stout, formulated a definition of essentiality that is used to this day. It is now necessary, however, to take into account elements not meeting their criteria of essentiality, as shown by a consideration of the element silicon.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00020413
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