Showing papers by "Jagiellonian University published in 1989"
TL;DR: Two hypotheses can explain the overproduction of zygotes: selective abortion and bet‐hedging, which assumes that optimal brood size varies unpredictably among breeding attempts.
Abstract: Two hypotheses can explain the overproduction of zygotes. Bet-hedging assumes that optimal brood size varies unpredictably among breeding attempts. Excess zygotes are produced so that the number of independent offspring can be flexibly adjusted downward to the optimum number for that attempt. Selective abortion suggests that parents overproduce zygotes, identify those with the highest fitness expectations, then kill or abandon those with lower fitness in order to concentrate investment in those with the best prospects. Both hypotheses for the overproduction of zygotes work in principle, alone or together, and can lead to impressive levels of zygote overproduction. For both hypotheses, high levels of zygote overproduction are only attained when the unit cost of an aborted embryo is low relative to the cost of an independent offspring. Under bet-hedging, it is also important that the variability of environmental conditions important for breeding success be high. The two hypotheses together make clear when a parent could increase its fitness by killing or abandoning its offspring.
165 citations
TL;DR: In this paper, les proprietes spectrales des operateurs sous-normaux en liaison avec celles de leurs extensions normales etudie les operateurs spectrales en liaison.
Abstract: On etudie les proprietes spectrales des operateurs sous-normaux en liaison avec celles de leurs extensions normales
106 citations
TL;DR: A strong correlation between inhibitor degradation and significant release of acid-stable activity could only be found with the V-8 enzyme, and the role of native I alpha I or its degradation products in controlling a specific proteolytic activity is still unknown.
98 citations
TL;DR: The three-dimensional structure of yeast enolase has been determined by the multiple isomorphous replacement method followed by the solvent flattening technique as discussed by the authors, and a polypeptide model, corresponding with the known amino acid sequence, has been fitted to the electron density map.
89 citations
TL;DR: An approach alternative to the conventional regression analysis of two-dismensional distribution of mammalian body sizes and metabolic rates is proposed, hypothetized that the actual species-specific energy budgets fill the space between physiological constraints functionally related to body mass.
Abstract: An approach alternative to the conventional regression analysis of two-dismensional distribution of mammalian body sizes and metabolic rates is proposed. It is hypothetized that the actual species-specific energy budgets fill the space between physiological constraints functionally related to body mass. The allometric correlation between energy budgets and body mass is a side effect of this pattern. An attempt was made to identify and quantify the relevant constraining functions.
84 citations
TL;DR: The number of astrocytes produced at particular days after injury, and their contribution to post-traumatic scar formation could be assessed only in the long-term experiment, after the newly formed cells became GFAP-positive.
64 citations
TL;DR: In this paper, a three-loop-two-gap resonator is described that has properties similar to the widely used X-band rectangular TE102 multipurpose cavity, but with 1 mm flat cells rather than 0.4 mm cells used in the cavity.
47 citations
TL;DR: In this article, the approximate solution of the Stokes equation has been used in order to estimate the magnitude of the hydrodynamic interactions between deposited and flowing particles, which are likely to be responsible for removing weakly-bound particles.
43 citations
TL;DR: Serotonin-like immunoreactive cells, dispersed through the airway epithelium as single cells, were found in all the fish species studied, presumably equivalent to the neuroendocrine cells reported in the lungs of mammalian and submammalian vertebrates.
Abstract: The pulmonary mucosa of three species of ancient fish was studied immunohistochemically to show the distribution of serotonin, regarded as the main monoamine of mammalian bronchopulmonary paraneurons. Serotonin-like immunoreactive cells, dispersed through the airway epithelium as single cells, were found in all the fish species studied. They are presumably equivalent to the neuroendocrine cells reported in the lungs of mammalian and submammalian vertebrates. However, the precise role and the function of these cells remain unknown. Since the species studied belong to the most primitive extant groups of ancient fish, the present investigation suggests that serotonin is widely distributed in the lungs of the vertebrates. Several peptides, known to be specific cytochemical markers for the identification of the pulmonary neuroendocrine cells of mammals, are being investigated in the lungs of the fish species studied. They may help to trace the phylogeny of the pulmonary neuroendocrine cell system and to elucidate its function in lower vertebrates.
41 citations
TL;DR: Using a spectral range of 3.5 G, spectral-spatial ESR imaging has been applied to obtain noninvasively a quantitative spatial description of intracellular oxygen concentrations in vitro as mentioned in this paper.
39 citations
TL;DR: In this article, the global and fragment (rigid and relaxed) hardness and softness (Fukui function) parameters of atoms-in-a-molecule (AIM) are discussed and alternative representations of the chemical potential equalization equations are examined.
01 Jul 1989-Graphical Models \/graphical Models and Image Processing \/computer Vision, Graphics, and Image Processing
TL;DR: The characteristics of edNLC-graph grammar for syntactic pattern recognition presented in this paper allows us to construct a deterministic syntax analyzer in a simple way.
Abstract: An edNLC-graph grammar (introduced in Janssens and Rozenberg, Inf. Sci 20 , 1980, 191–216) is a strong formalism for describing the scene. This grammar generates node- and edge-labelled graphs (EDG-graphs). The method of construction of unambigous string EDG-graph representation is briefly described. The characteristics of edNLC-graph grammar for syntactic pattern recognition presented in this paper allows us to construct a deterministic syntax analyzer in a simple way.
TL;DR: It was striking that the rickettsiae and viruses were found in one (or for the mite some) individual only, whereas the majority of the individuals of the same species were seen to be devoid of them.
TL;DR: A simple mathematical model of the ideal free distribution with unequal competitors is developed and a unique equilibrium distribution is predicted that yields the same average gains in every patch.
TL;DR: In this article, two regions in the i.r. spectra of uracils are analyzed: (a) the NH stretching region in crystals, and (b) the CO bending region in matrix-isolated monomers.
TL;DR: Sulphur isotopic compositions of copper and iron sulfides from the Polish part of the Kupferschiefer were determined and compared with data from the literature as mentioned in this paper.
Abstract: Sulphur isotopic compositions of copper and iron sulphides (dispersed and vein mineralization) from the Polish part of the Kupferschiefer were determined and compared with data from the literature. Most of the δ34S values of sulphides range from about -40 to -25%, indicating sulphide precipitation during bacterial sulphate reduction in an open system which gradually chanes into a closed system. Sulphides from veins are usually enriched in 34S compared to finely dispersed mineralization and were probably formed in a more closed system. Copper sulphides are generally a few permil heavier than pyrite. Coupled with detailed microscopical observations the isotope data suggest that the mineralization is either syngenetic or early diagenetic.
TL;DR: Results of an electrophoretic analysis of myosins are discussed in the light of their histochemical and functional properties.
Abstract: 1. 1. Muscle fibre types were identified histochemically by their actomyosin ATPase and SDH activities. 2. 2. Several myosin isoforms and a distict type of myosin heavy chain (MHC) were detected in red and white skeletal muscles as revealed by pyrophosphate and SDS gel electrophoreses. 3. 3 Results of an electrophoretic analysis of myosins are discussed in the light of their histochemical and functional properties.
TL;DR: It is concluded that IL-6 is the principal hepatocyte stimulating factor responsible for typical features of the acute phase response of liver cells.
TL;DR: It is suggested that olfactory signals in bank voles released by males increase aggression in females and the female's signals stimulate male behavior.
Abstract: Male and female bank voles reared in different conditions were investigated for their aggressiveness in order to show how social factors modify intermale and interfemale behavior. Singly reared males or females were paired with a tested animal for 10 min. The number of attacks and the accumulative attack times of singly reared males were higher than for females reared in similar conditions. The differences were not, however, statistically significant due to the variation among tested animals. There were significant differences in aggressiveness of females reared in various conditions before the test. Most attacks were observed in females reared with intact males. In this group, the accumulative attack time was significantly higher than that of singly reared, grouped females, or females kept with castrated or castrated-testosterone-treated males. Also, the aggression of males was affected by breeding. Both the number of attacks and the accumulative attack times were elevated in intact males kept with females. Housing of males in groups and castration significantly decreased the number of attacks of these animals. Injection of testosterone increased aggression in castrated males. It is suggested that olfactory signals in bank voles released by males increase aggression in females and the female's signals stimulate male behavior.
TL;DR: In this article, a theoretical model of population dynamics in discrete time units is investigated with the following assumptions: (1) resource partitioning among individuals is unequal, with different degrees of inequality, and (2) scramble competition without a monopolization of resources by stronger individuals occurs.
TL;DR: A number of sites with fresh faults and fractures have been mapped in detail and their postglacial (and sometimes late glacial) age is confirmed as discussed by the authors, which is consistent with the peak rate of glacial isostasy and increased strain rates by two orders of magnitude.
TL;DR: In this article, the attenuation of hadrons produced in leptonnucleus collisions is calculated in the string model of hadronization, where the end points of the coloured string are assumed to interact in nuclear matter via colour exchange without changing their energy and momentum.
TL;DR: In this paper, self-consistent electronic band structures and densities of states for two different ferromagnetic states of fcc iron are presented for the lattice constant a = 3.628 A and two different spin-polarized states with magnetic moments 1.35μ B and 2.50μ B, respectively.
28 Aug 1989
TL;DR: A new optimal on-line coloring algorithm for interval graphs is devised and how it can be used to the construction of a polynomial time approximation strategy for the NP-hard dynamic storage allocation problem is exhibited.
Abstract: We devise a new optimal on-line coloring algorithm for interval graphs. Then we exhibit how it can be used to the construction of a polynomial time approximation strategy for the NP-hard dynamic storage allocation problem. Previously Chrobak, Slusarek, and Woodall applied the suboptimal greedy coloring (first fit) to the analysis of a certain allocation strategy. Due to that analysis (only partially carried out) the performance ratio of their allocation algorithm lies within [4.45, 40]. The new strategy decribed here achieves the performance ratio of 3.
Journal Article•
TL;DR: In this article, the micro-and grand-canonical partition functions for a system of spins on a dynamical two-dimensional random spherical surface with a coordination number 3 restricted to the set of lattices without the tadpole' and self-energy insertions are calculated.
Abstract: The micro- and grand-canonical partition functions for a system of spins on a dynamical two-dimensional random spherical surface with a coordination number 3 restricted to the set of lattices without the tadpole' and «self-energy» insertions is calculated. The critical properties are shown to be the same as in the case of the unrestricted set of the O 3 lattices
TL;DR: The results substantiate the opinion that the near-edge x-ray absorption for semiconductors can be satisfactorily described within the one-electron approximation, although for Cd and Te in CdTe the pre-edge region seems to be influenced by excitonic many-body effects.
Abstract: X-ray near-edge absorption structure for ZnTe, CdTe, and HgTe has been studied with the use of synchrotron radiation. The ${L}_{1}$, ${L}_{2}$, and ${L}_{3}$ edges have been analyzed for Cd and Te in CdTe, as well as the ${L}_{1}$ and ${L}_{3}$ edges for Te in ZnTe and HgTe and the K edge of Zn in ZnTe. The experimental results are compared with absorption spectra which have been calculated on the basis of conduction-band state densities obtained from self-consistent linear muffin-tin-orbital calculations. A comparison of the experimental and theoretical results yields in most cases a good quantitative agreement, in particular for all ${L}_{1}$ and K edges analyzed. Due to deficiencies of the theoretical model, not quite so satisfactory results have been obtained for Cd ${L}_{2}$ and ${L}_{3}$ edges. In general, the results substantiate the opinion that the near-edge x-ray absorption for semiconductors can be satisfactorily described within the one-electron approximation, although for ${L}_{2}$ and ${L}_{3}$ edges the pre-edge region seems to be influenced by excitonic many-body effects, and that the combination of x-ray-absorption spectroscopy (XAS) and band-structure calculations constitutes a powerful tool for investigations of the empty states of these materials.
TL;DR: In this paper, the authors present a formulation for rapid simulations of polycrystalline ENDOR patterns for systems whose EPR spectra exhibit axial-resolved magnetic interactions (g tensor and central nucleus hyperfine couplings).
TL;DR: Puberty of female bank voles, (Clethrionomys glareolus) was estimated by uterine weight, and the number of Graafian follicles, while sexual maturation of males was inhabited by the presence of intact or castrated-testosterone treated males.
Abstract: Puberty of female bank voles, (Clethrionomys glareolus) (Schreber, 1780) was estimated by uterine weight, and the number of Graafian follicles. In male bank vole puberty was assessed by testes weight, accessory gland weight, and index of spermatogenesis. Sexual maturation of males was inhabited by the presence of intact or castrated-testosterone treated males.
TL;DR: Yellow-necked mice were collected at Bialowieza Primeval Forest in spring and autumn of each year beginning from autumn 1981 to 1985 to determine body weight and hematological parameters of both red and white blood cells.
Abstract: Yellow-necked mice were collected at Bialowieza Primeval Forest in spring and autumn of each year beginning from autumn 1981 to 1985. Body weight and hematological parameters of both red and white blood cells were determined.