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  • Springer  (30,120)
  • Molecular Diversity Preservation International (MDPI)
  • 1965-1969  (30,120)
  • 1969  (30,120)
  • 1
    Electronic Resource
    Electronic Resource
    Springer
    Bulletin of mathematical biology 31 (1969), S. 529-540 
    ISSN: 1522-9602
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Mathematics
    Notes: Abstract It is assumed that waves of configurational change of cell surface proteins can pass over the length of columnar cells in a multicellular membrane, thus passing across the membrane. It is expected that waves of change in fluidity of surface water and of Na+ vs K+ complexing preference by cell surface proteins will result from the waves of change in surface protein configuration. The entire wave process is called a chemiperistaltic wave, and is a natural extension of the concepts embodied in the association-induction hypothesis of Ling. It is shown that chemiperistaltic waves may transport Na+ across multicellular membranes through extracellular space between cells in a manner which is consistent with the experiments of Cereijidoet al. (1968) on frog skin. Equations for transport of Na+ by chemiperistaltic waves are derived for an idealized membrane. It seems possible that Na+−K+ activated ATPase may represent the isolated form of the cell surface protein in which chemiperistaltic waves are propagated or that an actomyosin-like protein may be involved.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
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    Springer
    Bulletin of mathematical biology 31 (1969), S. 541-562 
    ISSN: 1522-9602
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Mathematics
    Notes: Abstract Much of recent work to determine primary structures of nucleic acids and proteins employs the “fragmentation” or “overlap” stratagem. Typically, a preparation of a given polymer with unknown sequence is purified and then subjected to an enzyme known to cut the polymer at certain specific sites. The quantities and sequences of the resulting fragments are determined. For RNA primary sequences, pancreatic ribonuclease and T1 ribonuclease are ordinarily used as fragmenting enzymes. A technique is described for evaluating such fragment data. It has the following properties: It is easily determined whether or not the fragment data is inconsistent. It is always possible to determine the first and last nucleotides of the unknown sequence from the data of two limit digests. Consistent data from two limit digests can always be fitted into a convenient conceptual framework developed within the theory of graphs. In most cases, partial digest information can be used to modify the framework constructed from two limit digests, as such information is obtained. An efficient analysis of all fragment data in this conceptual framework can always be made. One can detect inconsistencies and can generate the entire list of polymer sequences consistent with the fragment data.
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  • 3
    Electronic Resource
    Electronic Resource
    Springer
    Bulletin of mathematical biology 31 (1969), S. 569-574 
    ISSN: 1522-9602
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Mathematics
    Notes: Abstract The effect of convective flow on the distribution of a diffusing substance that is being consumed is analyzed. For the mammalian cornea, one of the few tissues where convection, diffusion and consumption simultaneously exist, the effect of convection on the distribution of oxygen is shown to be small.
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  • 4
    Electronic Resource
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    Springer
    Bulletin of mathematical biology 31 (1969), S. 605-617 
    ISSN: 1522-9602
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Mathematics
    Notes: Abstract A previous study (Bull. Math. Biophysics,31, 417–427, 1969) on the definitions of stability of equilibria in organismic sets determined byQ relations is continued. An attempt is made to bring this definition into a form as similar as possible to that used in physical systems determined byF-relations. With examples taken from physics, biology and sociology, it is shown that a definition of equilibria forQ-relational systems similar to the definitions used in physics can be obtained, provided the concept of stable or unstable structures of a system determined byQ-relations is considered in a probabilistic manner. This offers an illustration of “fuzzy categories,” a notion introduced by I. Bąianu and M. Marinescu (Bull. Math. Biophysics,30, 625–635, 1968), in their paper on organismic supercategories, which is designed to provide a mathematical formalism for Rashevsky's theory of Organismic Sets (Bull. Math. Biophysics,29, 389–393, 1967;30, 163–174, 1968;31, 159–198, 1969). A suggestion is made for a method of mapping the abstract discrete space ofQ-relations on a continuum of variables ofF-relations. Problems of polymorphism and metamorphosis, both in biological and social organisms, are discussed in the light of the theory.
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  • 5
    Electronic Resource
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    Springer
    European journal of wildlife research 15 (1969), S. 41-62 
    ISSN: 1439-0574
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Description / Table of Contents: Résumé Dans le massif forestier des Fichtelgebirge (32.000 ha), le cheptel cerfs s'était accru, spécialement entre 1937 et 1962, pour atteindre 3 fois la densité considérée aujourd'hui comme normale (10 têtes/1.000 ha). Les causes de cet accroissement furent, par ordre d'importance décroissante, les suivantes: sous-estimation de l'effectif, sous-estimation du croît annuel moyen, relâchement de la pression cynégétique pendant et aussitôt après la guerre. Cet effectif important entraîna des dégâts de gibier préoccupants. Au cours de la dernière décennie, l'on procéda à différentes interventions (réduction sélective de l'effectif, affouragement hivernal, etc. ...) qui eurent pour effet de diminuer les dégâts d'une manière sensible tandis que la production annuelle de cerfs mâles de pleine maturité était désormais assurée. Le poids de la venaison des cerfs (mâles et femelles) augmenta de 15 à 40% au cours des dernières années. Les bois des cerfs de pleine maturité (1ère classe)-qui occuperont environ dix pourcent dans la future récolte annuelle de cerfs boisés-enregistrèrent un gain de poids analogue. Le secteur de “Veldensteiner Forst” (6.000 ha), cité occasionnellement dans cet article, ne doit pas être assimilé au massif des Fichtelgebirge considéré ici: en effet, en raison de son étendue réduite et de la proximité de la plaine de manoeuvres militaires de Grafenwöhr, ce territoire échappe à une gestion cynégétique rationnelle.
    Notes: Summary The red deer range of the Fichtelgebirge, with an extension of about 32 000 hectares, experienced an increase of deer density in the years 1937–1962 to about threefold the desired density of one deer per 100 hectares. This is due in part to the decreased culling during the war and postwar period, but primarily to the fact that population size and annual increase had been severely underestimated. The first decade following the reestablishment of hunting authorities after the war, calculations of the desirable harvest of female deer were too low. Wildlife damage increased accordingly. Over the last ten year period, efforts have been made to uncover the original mistakes. After the harvest level was raised, the population decreased noticeably and forest wildlife damage decreased. At the same time habitat management and proper winter feeding has been started. The reduction of the herd to one of desirable age and quality composition resulted in a number of prime deer heads that appear at the annual exhibition af antlers in Bayreuth. The increase in body weight of female and male deer is about 15–40%, and about as much weight increase was recorded for the best (class I) deer antlers. This class can be expected to represent 10% of the annual future harvest of male deer. The red deer range of Veldensteiner Forst (mostly the state forest district Pegnitz) cannot be subject to similar considerations since it is not large enough (6000 hectares) to be an independant management unit. Migrations of deer from surrounding areas also cannot be calculated.
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  • 6
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    Springer
    European journal of wildlife research 15 (1969), S. 83-84 
    ISSN: 1439-0574
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
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  • 7
    Electronic Resource
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    Springer
    Bulletin of mathematical biology 31 (1969), S. 433-439 
    ISSN: 1522-9602
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Mathematics
    Notes: Abstract A model of left ventricle is described which takes into account the physiologic variations of thickness, a function of time and distance prior to and during ejection, by assuming that the prolate spheroids are confocal at a given instant. The hyperbolic segment of arc between innermost and outermost spheroids, confocal with the latter, defines a so-called functional thickness, for which a derivation is given. Results show that this model operates in a range of eccentricity wherein thickness change per unit internal volume change are greatest.
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  • 8
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    Springer
    Computing 4 (1969), S. 24-29 
    ISSN: 1436-5057
    Source: Springer Online Journal Archives 1860-2000
    Topics: Computer Science
    Description / Table of Contents: Zusammenfassung Die vorliegende Arbeit bringt einige ergänzende Resultate über ein in [4] betrachtetes Wartesystem. Die in [4] entwickelten numerischen Methoden zur Berechnung von Gleichgewichtswahrscheinlichkeiten werden diskutiert.
    Notes: Summary In an earlier paper [4] a certain service system has been investigated. The present paper adds some further results and discusses the numerical methods developed in [4] for the calculation of equilibrium probabilities.
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  • 9
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    Springer
    Computing 4 (1969), S. 75-75 
    ISSN: 1436-5057
    Source: Springer Online Journal Archives 1860-2000
    Topics: Computer Science
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  • 10
    ISSN: 1436-5057
    Source: Springer Online Journal Archives 1860-2000
    Topics: Computer Science
    Type of Medium: Electronic Resource
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