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  • Age  (1)
  • Körpergröße  (1)
  • PACS: 25.30.Fj Nuclear Reactions: Inelastic electron scattering to continuum – 14.20.Dh Properties of Specific Particles: Protons and neutrons – 13.40.Gp Electromagnetic form factors – 25.10.+s Nuclear reactions involving few–nucleon systems  (1)
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  • 1
    ISSN: 1432-1963
    Keywords: Schlüsselwörter Normales Hirngewicht ; Erwachsene ; Alter ; Geschlecht ; Körpergröße ; Gewicht ; Key words Normal brain weight ; Adults ; Age ; Sex ; Height ; Weight
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Summary Based on more than 8000 autopsies of male and female patients without brain diseases the normal brain weight of adult males and females in relation to sex, age, body-weight, and body-height as well as Body Mass Index were calculated. The average brain weight of the adult male was 1336 gr; for the adult female 1198 gr. With increasing age, brain weight decreases by 2.7 gr in males, and by 2.2 gr in females per year. Per centimeter body height brain weight increases independent of sex by an average of about 3.7 gr. Body Mass Index is of minor importance and only relevant in males. Based on these data the independent variables, age and height, were for the first time combined in a nomogram for the calculation of brain weight. The mathematical functions were integrated in a computer program which facilitates the calculation of normal brain weights in individual cases.
    Notes: Zusammenfassung Anhand von über 8000 Autopsien von Patienten ohne Hirnkrankheiten wurden die Normgewichte der Gehirne für Männer und Frauen in Abhängigkeit von Alter, Körpergröße, Gewicht und Body Mass Index berechnet. Das Hirngewicht des erwachsenen Mannes beträgt im Durchschnitt 1336 g, das der erwachsenen Frau 1198 g. Pro Altersjahr nimmt das Hirngewicht beim Mann um ca. 2,7 g, bei der Frau um ca. 2,2 g ab. Pro cm Körpergröße nimmt das Hirngewicht bei beiden Geschlechtern um ca. 3,7 g zu. Den geringsten Einfluß auf das Hirngewicht hat der Body Mass Index, der praktisch nur bei Männern bedeutsam ist. Aus den unabhängigen Variablen, Alter und Körpergröße, wurde erstmals ein Nomogramm für das zu erwartende Hirngewicht konstruiert. Gleichzeitig wurden die Funktionen unter Berücksichtigung der wichtigsten Einflußgrößen in ein Computerprogramm integriert, das die Normgewichte errechnet und quantitative Aussagen über die Abweichung des Hirngewichts von der Norm im Einzelfall erlaubt.
    Type of Medium: Electronic Resource
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  • 2
    ISSN: 1434-601X
    Keywords: PACS: 25.30.Fj Nuclear Reactions: Inelastic electron scattering to continuum – 14.20.Dh Properties of Specific Particles: Protons and neutrons – 13.40.Gp Electromagnetic form factors – 25.10.+s Nuclear reactions involving few–nucleon systems
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract: The electric form factor of the neutron G E,n has been determined at the Mainz Microtron MAMI at the low momentum transfer Q 2= 0.15 (GeV/c)2 in a measurement of the recoil polarisation ratio P x/Pz in the quasifree reaction D(e,e′n)p. At this Q 2 the influence of the nuclear binding is strong. A purely kinematical model is used to get some insight into the effect of the initial Fermi momentum distribution of the neutron. The influence of the final state interaction is determined quantitatively by a model of Arenhövel et al.. After the corresponding corrections a value of G E,n(0.15 (GeV/c)2) = 0.0481±0.0065stat±0.0053syst is obtained.
    Type of Medium: Electronic Resource
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