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  • 1990-1994  (19)
  • 1955-1959
  • 1920-1924
  • 1910-1914
  • Life and Medical Sciences  (12)
  • 14.60.Ef  (4)
  • Aggression  (3)
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  • 1
    Digitale Medien
    Digitale Medien
    Agonistic relationships between female mountain gorillas (Gorilla gorilla beringei) (1994)
    Springer
    Behavioral ecology and sociobiology 34 (1994), S. 347-358 
    Details
    ISSN: 1432-0762
    Schlagwort(e): Gorillas ; Females ; Aggression ; Agonistic hierarchies
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie
    Notizen: Abstract Females in some mountain gorilla groups can be ranked on the basis of decided, non-aggressive approach-retreat interactions. However, data on four gorilla groups show that females do not form clear agonistic dominance hierarchies. Most aggressive interactions between females were undecided, and most dyads had undecided dominance relationships (Fig. 2). Females ignored aggression or responded to it aggressively more often than they responded submissively (Fig. 3). Moreover, directional inconsistency in aggression (including escalated contests) was high, and in some groups females showed significant bidirectionality in initiation of aggression (i.e., the more often they received aggression from partners, the more often they directed aggression at those partners; Fig. 4). Assigning ranks on the basis of aggressive interactions has limited power to explain variation in rates of initiating aggression and in responses and outcomes to aggression. Aggression was most common during feeding, but usually did not interrupt feeding bouts. It was proportionately more common in contexts that seem to involve competition for access to males (Figs 5, 6). This is consistent with the argument that females depend crucially on male services. As predicted by current models of female primate social relationships, agonistic relationships between gorilla females are unlike those typical in cercopithecine primates. They resemble those of some other primates and some equids in which contest competition for food is relatively unimportant and ecological costs of female transfer are low.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01209781
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  • 2
    Digitale Medien
    Digitale Medien
    Agonistic relationships between female mountain gorillas (Gorilla gorilla beringei) (1994)
    Springer
    Behavioral ecology and sociobiology 34 (1994), S. 347-358 
    Details
    ISSN: 1432-0762
    Schlagwort(e): Key words: Gorillas ; Females ; Aggression ; Agonistic hierarchies
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie
    Notizen: Abstract. Females in some mountain gorilla groups can be ranked on the basis of decided, non-aggressive approach-retreat interactions. However, data on four gorilla groups show that females do not form clear agonistic dominance hierarchies. Most aggressive interactions between females were undecided, and most dyads had undecided dominance relationships (Fig. 2). Females ignored aggression or responded to it aggressively more often than they responded submissively (Fig. 3). Moreover, directional inconsistency in aggression (including escalated contests) was high, and in some groups females showed significant bidirectionality in initiation of aggression (i.e., the more often they received aggression from partners, the more often they directed aggression at those partners; Fig. 4). Assigning ranks on the basis of aggressive interactions has limited power to explain variation in rates of initiating aggression and in responses and outcomes to aggression. Aggression was most common during feeding, but usually did not interrupt feeding bouts. It was proportionately more common in contexts that seem to involve competition for access to males (Figs 5, 6). This is consistent with the argument that females depend crucially on male services. As predicted by current models of female primate social relationships, agonistic relationships between gorilla females are unlike those typical in cercopithecine primates. They resemble those of some other primates and some equids in which contest competition for food is relatively unimportant and ecological costs of female transfer are low.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01209781
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  • 3
    Digitale Medien
    Digitale Medien
    Agonistic relationships between female mountain gorillas (Gorilla gorilla beringei) (1994)
    Springer
    Behavioral ecology and sociobiology 34 (1994), S. 347-358 
    Details
    ISSN: 1432-0762
    Schlagwort(e): Gorillas ; Females ; Aggression ; Agonistic hierarchies
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie
    Notizen: Abstract Females in some mountain gorilla groups can be ranked on the basis of decided, non-aggressive approach-retreat interactions. However, data on four gorilla groups show that females do not form clear agonistic dominance hierarchies. Most aggressive interactions between females were undecided, and most dyads had undecided dominance relationships (Fig. 2). Females ignored aggression or responded to it aggressively more often than they responded submissively (Fig. 3). Moreover, directional inconsistency in aggression (including escalated contests) was high, and in some groups females showed significant bidirectionality in initiation of aggression (i.e., the more often they received aggression from partners, the more often they directed aggression at those partners; Fig. 4). Assigning ranks on the basis of aggressive interactions has limited power to explain variation in rates of initiating aggression and in responses and outcomes to aggression. Aggression was most common during feeding, but usually did not interrupt feeding bouts. It was proportionately more common in contexts that seem to involve competition for access to males (Figs 5, 6). This is consistent with the argument that females depend crucially on male services. As predicted by current models of female primate social relationships, agonistic relationships between gorilla females are unlike those typical in cercopithecine primates. They resemble those of some other primates and some equids in which contest competition for food is relatively unimportant and ecological costs of female transfer are low.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00197005
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  • 4
    Digitale Medien
    Digitale Medien
    The study of prompt and delayed muon induced fission (1993)
    Springer
    The European physical journal 345 (1993), S. 89-95 
    Details
    ISSN: 1434-601X
    Schlagwort(e): 13.10.+q ; 14.60.Ef ; 25.85.Ge ; 27.90.+b ; 36.10.Dr
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Abstract The ratios of prompt to delayed fission yields for the isotopes233U,234U,235U,236U,238U,237Np,242Pu, and244Pu and the fission probabilities relative to each other have been investigated experimentally. Using the value of the total fission probability for237Np the absolute probabilities for prompt and delayed fission have been determined. The fission probabilities per muon captureP fc have been derived for all the isotopes and compared with an evaluation based on excitation functions from theory.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01290344
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  • 5
    Digitale Medien
    Digitale Medien
    Muon attachment in prompt fission of237Np (1991)
    Springer
    The European physical journal 339 (1991), S. 427-433 
    Details
    ISSN: 1434-601X
    Schlagwort(e): 13.10.+9 ; 14.60.Ef ; 25.30.−C ; 25.85.−W ; 27.90.+b ; 36.10
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Abstract The probabilities of muon attachment to fission fragments in the prompt fission of237Np have been determined as a function of fragment mass and total kinetic energy release in a (μ −,f 1 f 2 e −)-coincidence measurement. A strong dependence of the attachment probability on the fragment mass is observed. The experimental results are compared with theoretical predictions.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01288426
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  • 6
    Digitale Medien
    Digitale Medien
    Nuclear excitation and prompt fission in muonic238U (1992)
    Springer
    The European physical journal 342 (1992), S. 111-120 
    Details
    ISSN: 1434-601X
    Schlagwort(e): 13.10.+q ; 14.60.Ef ; 23.20.−g ; 25.30.−c ; 25.85.−w ; 27.90.+b ; 36.10.−k
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Abstract A study of muonic238U has been performed in a combined (μ −,γ f) and (μ −,γγ) coincidence experiment to investigate the role of non-radiative transitions and their fission probabilities. An augmentation of the outer fission barrier ofΔE b =(0.6±0.1) MeV due to the presence of the muon is deduced. A significant contribution to the prompt fission yield not only results from the (2p→1s) and (3d→1s) non-radiative transitions, but also from other radiationless transitions. Specifically, the measured fission probabilities of the transitions (2p→1s), (3d→1s), and (3p→1s) are (1.5±0.4)%, (5.7±1.7)%, and (5.3±1.9)%, respectively.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01294496
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  • 7
    Digitale Medien
    Digitale Medien
    Muon capture rates in233U,234U,235U,236U,238U, and237Np (1990)
    Springer
    The European physical journal 335 (1990), S. 1-8 
    Details
    ISSN: 1434-601X
    Schlagwort(e): 13.10. + q ; 13.35. + s ; 14.60.Ef ; 25.85.-w ; 27.90. + b ; 36.10.Dr
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Abstract The time spectra for muon induced fission of233U,234U,235U,236U,238U, and237Np were measured simultaneously, detecting both fragments in coincidence in a fast multi parallel plate avalanche detector. The observed mean lifetimes τ are 68.9 ± 0.3 ns, 70.6 ± 0.2 ns, 72.2 ±0.2 ns, 74.3 ± 0.3 ns, 77.0 ±0.4 ns, and 69.8 ±0.2 ns for the above isotopes, respectively. No second time component, tentatively ascribed to a possible fission isomer, was observed. The deduced total capture rates are compared with theoretical predictions.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01289340
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  • 8
    Digitale Medien
    Digitale Medien
    A multiplanar anatomic study of the cervical proximal nerve roots and spinal nerves (1992)
    New York, NY [u.a.] : Wiley-Blackwell
    Clinical Anatomy 5 (1992), S. 433-440 
    Details
    ISSN: 0897-3806
    Schlagwort(e): anatomy ; spine ; sheath ; Life and Medical Sciences ; Miscellaneous Medical
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Medizin
    Notizen: An anatomic study focused on the proximal cervical spinal nerves has not been reported. Therefore, we dissected the cervical spinal nerves of three cadavers and examined stained sections in parasagittal and axial planes through the proximal cervical spinal nerves and root sheaths. These studies documented distinct segments of the spinal nerve which had not been completely described in the previous anatomic studies. The sheath originates from the dural sac as a common sleeve, divides into two sleeves, one containing the ventral root and one the dorsal root, and then distal to the dorsal root ganglion fuses again into one sleeve. A space, the interradicular cleft, separates the dorsal and ventral portions of the sleeve. The proximal segment of the spinal nerve proper distal to the dorsal root ganglion is composed of multiple small fascicles surrounded by a dense epineurium. The presence of an interradicular cleft in the cervical nerve root sheath and of fascicles in the cervical spinal nerve has significance for imaging of the cervical spinal nerves and for the pathogenesis of symptoms in cases of partial compression. © 1992 Wiley-Liss, Inc.
    Zusätzliches Material: 4 Ill.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/ca.980050603
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  • 9
    Digitale Medien
    Digitale Medien
    Dihydropyridine calcium antagonist modulates cholesterol metabolism and eicosanoid biosynthesis in vascular cells (1992)
    New York, N.Y. : Wiley-Blackwell
    Journal of Cellular Biochemistry 48 (1992), S. 393-400 
    Details
    ISSN: 0730-2312
    Schlagwort(e): calcium channel blocker ; atherosclerosis ; LDL ; LDL-receptor ; vascular smooth muscle ; PGI2 ; cyclic AMP ; cyclooxygenase ; Life and Medical Sciences ; Cell & Developmental Biology
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Biologie , Chemie und Pharmazie , Medizin
    Notizen: Recent clinical studies have shown that calcium channel blockers can retard and possibly reduce the angiographic progression of coronary artery disease. Calcium channel blockers also inhibit dietary-induced atherosclerosis in animal models of this disease. In this study, we delineate potential cellular and molecular mechanisms by which nicardipine, a dihydropyridine calcium antagonist, may alter lipoprotein and cholesterol trafficking, affect the regulatory signal transduction pathways involved in accelerating cholesteryl ester (CE) catabolism in vascular smooth muscle cells, and modulate cell-cell interactions of vascular and inflammatory cells. We demonstrate in arterial smooth muscle cells that nicardipine increases (1) LDL binding, uptake, and degradation, (2) RNA transcript levels for the LDL receptor, (3) CE catabolic activity, (4) PGI2 release, and (5) RNA transcript levels for cyclooxygenase. Furthermore, nicardipine blocked cytokine-induced monocyte adhesion to endothelial cells and smooth muscle cells. Taken together, these findings support the hypothesis that nicardipine may function as an anti-atherosclerotic agent by promoting CE catabolism and cholesterol clearance and by reducing monocyte adhesion to the activated endothelium.
    Zusätzliches Material: 6 Ill.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/jcb.240480408
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  • 10
    Digitale Medien
    Digitale Medien
    The p53 protein detected by immunohistochemical staining is not always mutant (1993)
    New York, N.Y. : Wiley-Blackwell
    Journal of Cellular Biochemistry 53 (1993), S. 248-248 
    Details
    ISSN: 0730-2312
    Schlagwort(e): Life and Medical Sciences ; Cell & Developmental Biology
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Biologie , Chemie und Pharmazie , Medizin
    Notizen: In human mammary carcinoma, positive immunohistochemical staining for p53 protein is not always indicative of mutation in the p53 gene. Although positive staining is seen in excess of 50% of tumours, mutations have been found in only some 20% of cases. In this presentation, positive p53 staining in mammary carcinomas will be related to the presence and absence of mutation and other possible underlying mechanisms.In some positively stained tumours a mutation has been found. In others, no mutation has been demonstrated and apart from possible stabilisation by a protein such as MDM2, there are alternative underlying mechanisms for this discrepancy. Wild type p53 is elevated in response to DNA damage. This effect can be seen in patients given pre-operative chemotherapy and in cell lines irradiated with UV light and with x-rays. Strong positive staining in scattered nuclei has been found in cell lines with activated ras and myc genes. We postulate that this may also be the reason for similar patterns observed in human tumours.Comparable mechanisms may be active in inherited cancers. Although positive p53 staining in some Li-Fraumeni syndrome patients is associated with mutation, in other Li-Fraumeni-like families, no mutation has been found despite positive staining in tumour and normal tissues.Whatever the mechanism underlying the stabilisation of the protein, increased expression of p53 protein in the majority of tumour cells appears to be associated with poor prognosis in breast carcinoma.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/jcb.240531147
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