Showing papers by "Jagiellonian University published in 1977"
TL;DR: It is shown here that summer food is a major factor limiting roe deer population size.
Abstract: THE sizes of unexploited populations of roe deer (Capreolus capreolus) are regulated by spring migration. Individuals which have been able to establish a territory (bucks) or home range (does) force all other animals to move out of the habitat. This phenomenon is specific to age class, and if there is no mortality amongst adult animals, most yearlings emigrate to find new forest area13. Thus, in order to develop an intensive harvest policy for roe deer population, knowledge of the number of animals which can be supported by the habitat (that is, social carrying capacity) is essential to avoid undesirable population losses through emigration. During 1970–75, an intensive team research study was carried out in various regions throughout Poland6. Deer food resources were estimated by the harvest plot method3, and winter population densities were precisely determined by drive census techniques11. Based on these data, several study areas were selected in which hunting and natural mortality were very low, and where it was known that most juvenile animals emigrated each spring. We show here that summer food is a major factor limiting roe deer population size.
58 citations
TL;DR: The results suggest that male mice produce only one pheromone which can evoke different effects depending on a physiological state of the female.
Abstract: Pregnant mice exposed to male urinary proteins isolated by salting out of excreted urine, bladder urine, or urine from castrated and testosterone-treated males blocked pregnancy in 3-4 days after treatment. Also homogenates of preputial glands evoked the Bruce effect. Females exposed to urinary proteins had shortened oestrous cycle. The results suggest that male mice produce only one pheromone which can evoke different effects depending on a physiological state of the female.
56 citations
01 Dec 1977
TL;DR: In this article, a general convective diffusion of spherical particles to a rotating disk surface has been formulated considering London-van der Waals, gravity, and real hydrodynamic forces, and the flux of the particles to the rotating disk was determined as the function of four dimensionless parameters: Ad, λ/a, Pe, and Gr.
Abstract: A general equation describing convective diffusion of spherical particles to a rotating disk surface has been formulated considering London-van der Waals, gravity, and real hydrodynamic forces. This linear differential equation of the second order was numerically solved by the use of a CYBER-72 computer. The flux of the particles to the rotating disk was determined as the function of four dimensionless parameters: Ad, λ/a, Pe, and Gr, with respect to the above-mentioned interactions. The dependence of the flux on particle radius, density, the Hamaker constant, and disk angular velocity is graphically presented. The flux predicted approaches the value obtained by using Levich's formula as the radius of the particle becomes small, i.e., for a < 0.15 μm.
42 citations
TL;DR: In this article, stable 57 Fe implanted into Al at energies of 20 to 70 keV and doses of 1014 to 2·1017 ions/cm2 was studied with conversion electron Mossbauer spectroscopy at room and liquid nitrogen temperatures.
Abstract: Stable57Fe implanted into Al at energies of 20 to 70 keV and doses of 1014 to 2·1017 ions/cm2 was studied with conversion electron Mossbauer spectroscopy at room and liquid nitrogen temperatures. Spectra composed of a single line and a doublet were observed. Similarly as in the splat-quenched FeAl alloys iron monomers and iron associations, mostly dimers, are observed. The isomer shifts of both components differ considerably and do not change with iron concentration. The splitting of the doublet increases with iron concentration, the increase being reproduced by computer simulations of electric field gradients in lattices with a random distribution of charge defects. The observed probability of formation of iron associates is higher than in random systems, especially at high iron doses.
34 citations
01 May 1977
TL;DR: A theoretical interpretation of the IR spectra of the hydrogen bonds in three different crystalline forms of oxalic acid (α, β and dihydrate) is presented in this article.
Abstract: A theoretical interpretation is presented of the IR spectra of the hydrogen bonds in three different crystalline forms of oxalic acid (α, β and dihydrate). The calculated spectra are in quantitative agreement with the experimental one for both the frequency and intensity distribution of the vibrational fine structure of the hydrogen bond absorption spectrum. The drastic changes in the IR spectra introduced by the deuterium substitution in the hydrogen bonds are quantitatively predicted by the theory.
32 citations
TL;DR: In this article, the authors have constructed diagrams of metastable electrochemical equilibria of the system copper-potassium ethylxanthate-water, at 25°C, for the total activity of [EtX−] + [HEtX] + 2 [(EtEt)2] (equalling 10−1, 10−4 and 10−7 mol/dm3).
31 citations
TL;DR: In this paper, the magnon excitations and instability conditions of the paramagnetic state against the ferromagnetic state are derived in the weak and strong interaction theories, and virtual hopping is included in the effective Hamiltonian.
Abstract: The Hubbard model with inclusion of the intersite interactions is considered. The magnon excitations and instability conditions of the paramagnetic state against the ferromagnetic state are derived in the weak- and strong-interaction theories. In the latter case a virtual hopping is included in the effective Hamiltonian.
31 citations
TL;DR: The conversion electron Mossbauer spectra of 57 Fe implants in silicon were measured in an applied strong magnetic field as discussed by the authors, and the existence of axial, positive quadrupole coupling at iron nuclei was established.
25 citations
TL;DR: In this article, the results of calorimetric investigations of p-methoxybenzylidene-p-n-butylaniline (MBBA) and 4.4′-di-nheptyloxyazoxybenzinene (HAB) have been found to exist.
Abstract: Part I of this paper presents the results of calorimetric investigations of p-methoxybenzylidene-p-n-butylaniline (MBBA) and 4.4′-di-n-heptyloxyazoxybenzene (HAB). In both these substances two modifications of the solid phase, a metastable and a stable one, have been found to exist. Part II presents the results of measurements of the complex dielectric permittivity e∗ = e' - je for the solid and liquid phases of both substances. The metastable modification of MBBA was found to feature a dielectric relaxation process in the kilohertz range associated with the rotational motions of the tail groups about the long axes of the molecules. No such process was revealed in the case of HAB. In the liquid phases of these two compounds relaxation processes were observed in the microwave-frequency range; these are interpreted as being due to the rotation of entire molecules about their own long axes. The existence of such motion in the smectic phase C of HAB seems to be not in agreement with the predictions o...
24 citations
TL;DR: In this paper, a X-ray powder diffraction study is made in [Ni(NH3)6](ClO4)2 in a temperature range 273 to 80 K, and it is found that the compound undergoes an enantiomorphic transition at 173 K: the cubic form, space group Fm3m, changes into a monoclinic one, space groups P21/n.
Abstract: A X-ray powder diffraction study is made in [Ni(NH3)6](ClO4)2 in a temperature range 273 to 80 K. It is found that the compound undergoes an enantiomorphic transition at 173 K: the cubic form, space group Fm3m, changes into a monoclinic one, space group P21/n. At 143 K a further ordering of the monoclinic structure seems to take place.
Eine Rontgenpulverbeugungsuntersuchung wird fur [Ni(NH3)6](ClO4)2 im Temperaturbereich zwischen 273 bis 80 K durchgefuhrt. Es wird gefunden, das die Verbindung einen enantiomorphischen Ubergang bei 173 K durchgeht; die kubische Form, Raumgruppe Fm3m, andert sich in eine monokline Form, Raumgruppe P21/n. Bei 143 K scheint eine weitere Ordnung der monoklinen Struktur stattzufinden.
23 citations
TL;DR: In this article, the authors show that the equilibrium pressure of oxygen over the V 2 O 5−x system performed by mass spectrometry has been ascribed to thermodynamic equilibrium in the V 6 O 13 −O 2 system.
TL;DR: In this article, the crystal and magnetic properties of nickel ferrite-aluminates are investigated with X-ray, neutron diffraction, magnetometric, and Mossbauer effect methods.
Abstract: The crystal and magnetic properties of nickel ferrite-aluminates are investigated with X-ray, neutron diffraction, magnetometric, and Mossbauer effect methods. Variation of the saturation magnetic moment per molecule measured at 78 K with chemical composition is satisfactorily explained on the basis of the collinear spin ordering model and the elaborated and experimentally verified cation distributions model.
Es werden die Kristalleigenschaften und die magnetischen Eigenschaften von Aluminium-Nickel-Ferriten mit Hilfe von Rontgenstrahluntersuchungen, Neutronenbeugung, magnetometrischen Methoden und dem Mosbauereffekt untersucht. Die Anderung des magnetischen Sattigungs-momentes eines Molekuls mit der Anderung der chemischen Zusammensetzung, gemessen bei 78 K, wird auf der Grundlage des Modells der kollinearen Anordnung der Spines sowie des erarbeiteten und experimentell uberpruften Modells befriedigend erklart.
TL;DR: In this article, it was shown that the low stability of high molecular poly(ethylene oxide) is due to a statistical degradation following a radical mechanism which leads to the formation of aldehyde groups at the end positions of the fragments.
Abstract: With thermogravimetric analysis, IR and ESR measurements it could be shown that the low stability of high molecular poly(ethylene oxide) is due to a statistical degradation following a radical mechanism which leads to the formation of aldehyde groups at the end positions of the fragments. Mass spectroscopical investigations of degraded (aged) as well as of freshly prepared poly(ethylene oxide) revealed a consistent and easily comprehensible picture. Always 3 series of peaks could be found and the difference between two successive peaks amounts to 44 mass units in each series, corresponding to the oxyethylene unit. The mass spectra of degraded poly(ethylene oxide) were found to be always more rich in fragmentations than those of non degraded ones. The mechanism of poly(ethylene oxide) degradation caused by the action of electrons could be explained with the help of the obtained mass spectra. The degradation of high molecular poly(ethylene oxide), which even takes place at room temperature in the dark and in the absence of air, could be restricted considerably by adding a suitable stabilizer to the polymerization mixture.
TL;DR: The results obtained show the similarity of this inhibitor isolated from horseBlood leucocyte cytosol to other inhibitors isolated from human or pig blood leucocytes.
Abstract: Cytosol of horse blood polymorphonuclear leucocytes contains an inhibitor active against neutral proteinases from the granules of these cells and against chymotrypsin, elastases I and II from pig pancreas, but not against trypsin. A method has been elaborated to isolate and purify this inhibitor by means of salting out with ammonium sulphate (45–70% saturation), followed by chromatography and rechromatography on a column of DEAE-Sephadex A-50. The preparation obtained is homogeneous during polyacrylamide gel electrophoresis in the presence of 0.1% sodium dodecylsulphate after reduction with 2-mercaptoethanol. It is a thermolabile protein soluble at its isoelectric point (pH 5.38) and having a molecular weight of 35200 but aggregating in solutions of low ionic strength and irreversibly precipitating during dialysis at pH 4.0. The results obtained show the similarity of this inhibitor isolated from horse blood leucocyte cytosol to other inhibitors isolated from human or pig blood leucocytes.
TL;DR: In this article, a quantitative theory of hydrogen bonding has been applied to the temperature dependence of the IR spectra of a simple hydrogen bond in the hydrochloride/dimethyl ether complex.
TL;DR: In this paper, the solubility of solids in cryogenic liquids was calculated using the Preston-Prausnitz method, using Fortran for a CYBER-72 computer.
TL;DR: In this article, a Dexter-type relation was described for the dependence of the AM phosphorescence rate parameter k PT on its distance from a heavy-atom (HA) iodide ion is described.
TL;DR: In this article, the absorption spectra of some spirans and their half-compounds have been obtained and their comparison has allowed the dominating conformation to be defined for respective spirans.
TL;DR: In this article, a group of twelve low-molecular-weight compounds was chosen to model the most likely carbonyl products of polystyrene photo-oxidation.
TL;DR: In this article, a model for the mechanism of anodic oxidation of the semiconductor mineral chalcocite in an ammoniacal environment is proposed, and the kinetic parameters of the process αa, ks, j00, the formal potential and the electrochemical order of the reaction in relation to ammonia are given.
TL;DR: In this paper, semi-empirical calculations of the electron distribution and energy have been carried out for complexes of Co2+ and Co3+ ions in which acrolein as sixth ligand was coordinated in different ways.
TL;DR: In this article, a spiral magnetic structure was established on the basis of neutron diffraction and the phase transition at T t is connected with the reorientation of the spiral axis.
Abstract: NiMnGe is antiferromagnet with a Neel temperature T N = 346 K. Additional magnetic phase transition is observed at T t = 185 K. On the basis of neutron diffraction a spiral magnetic structure was established. The phase transition at T t is connected with the reorientation of the spiral axis.
TL;DR: In this paper, a simple model of the coupling between the Frenkel exciton and charge transfer states is proposed and discussed, and the model is shown to be stable in the presence of noise.
TL;DR: In this paper, temperature dependence of Raman spectra was measured for polycrystalline [Ni(NH3)6](ClO4)2 and [Ni[ND3]6] (ClO 4)2.
Abstract: Temperature dependence of Raman spectra was measured for polycrystalline [Ni(NH3)6](ClO4)2 and [Ni(ND3)6](ClO4)2. Spectroscopic evidence for the phase transition at 173 K was obtained. The phase transition is evident in the splitting of some bands corresponding to the internal ClOion vibrations and in charactreistic intensity dependences of the bands. Some bands also showed a characteristic broadening with increasing temperature, which we interpret as being connected with stochastic reorientations of NH3 groups and ClOions. Two bands which were not resolved from the others at the room temperature study1 were now evidenced at low temperatures.
TL;DR: In this paper, a phase separation model of the micelles was proposed to account for the abrupt change of slope of the isotherms at cmc, and an expression was derived relating the effective degree of ionization ( z ′) of the micelle with the analytical equilibrium partition concentrations of the long-chain electrolyte.
TL;DR: In this article, the ratio Fe2+/Fe3+ was found to be strongly reduced near the surface of air-heated pellets, and reestablishes to the value about 0.4 after heat treatment of the smaples in vacuum.
Abstract: Mossbauer spectra of 57Fe in iron-phosphate glass are both in transmission (powder samples) and conversion electron reemission mode (pellets). Octahedrally coordinated ferrous and ferric ions are determined. The ratio Fe2+/Fe3+ is found to be strongly reduced near the surface of air-heated pellets, and reestablishes to the value about 0.4 after heat treatment of the smaples in vacuum.
Es werden Mosbauerspektren von 57Fe in Eisenphosphatglasern sowhol in Transmission (Pluverproben) als auch mit der Konversionselektronen-Reemissionsmode (Pellets) untersucht. Oktaedrisch koordiniterte Ferro- und Ferriionen werden bestmitt. Es wir gefunden, das sich das Verhaltnis Fe2+/Fe2+ in der Nahe der Oberflache der an Luft erhitzten Pellets stark verringert, wobei nach Temperung im Vakuunm die Proben wieder den Wert von etwz 0,4 annehmen.
TL;DR: The influence of acidification on crystallization and kinetics of growth of sodium trimolybdate has been interpreted in this article, where the process of nucleation at the surface layer of the solution has been described.
Abstract: The influence of acidification on crystallization and kinetics of growth of sodium trimolybdate has been interpreted. Furthermore the process of nucleation at the surface layer of the solution has been described.
Der Einflus des Saureinhalts und die Kinetik des Kristallisationsvorganges wurde diskutiert. Es wurde auch der Keimbildungsprozes an der Losungsoberflache beschrieben.