Showing papers by "University of Zagreb published in 1975"
TL;DR: In this paper, a tridentate coordination of two 4-(2-pyridylazo) resorcinol dibasic anions, bonded to cobalt(III) in a symmetric arrangement with both azo groups coordinated to the cobalt atom through a single nitrogen lone pair, was shown.
37 citations
TL;DR: The shorter stature of the rain forest populations seems to be largely genetic in origin; it probably results from selective pressure exerted by the thermal stres in this hot and wet biome where sweating is of low thermolytic efficiency.
Abstract: 25 populations of the rain forest and 44 of the open country, all descended from the West-Central African stock which lived in the latter biome, are compared for body weight and height. On a log weight/height diagram, the 69 populations cluster along a straight line which intersects the lines of equal body weight/surface ratio: the shorter the body size, the lower the ratio tends to be. The rain forest populations are concentrated in the lower part of the bivariate distribution. The shortest one, the Mbuti Pygmies, has a very low ratio despite a relatively heavy weight. The shorter stature of the rain forest populations seems to be largely genetic in origin; it probably results from selective pressure exerted by the thermal stres in this hot and wet biome where sweating is of low thermolytic efficiency. The amount of reduction of adult stature depends for a large part on the number of generations spent in the forest by the population. Line A (in figure 1) is similar to a growth trend. The 69 populations differ genetically by the target that growth has to reach on a common log weight/height trend line. They achieve this differentiation through different speeds of growth.
34 citations
TL;DR: In this paper, the exact conditions under which the critical behavior of the electron density of states involves the dynamical critical indices of the soft phonon, as well as the corresponding expressions for the electron densities of states are derived for a model phonon structure factor.
Abstract: The exact conditions under which the critical behavior of the electron density of states involves the dynamical critical indices of the soft phonon, as well as the corresponding expressions for the electron density of states are derived for a model phonon structure factor. The application of these results to real materials is discussed. A good understanding of the anomalous conductivity behavior in the qua~i-one-dimensional systems requires a knowledge of simpler quantities, such as the density of states of the electron system. Beside this, the electron density of states is interesting in . itself, since it is directly related to the magnetic susceptibility and other derived quantities [1-4]. These data show that the phonon softening produces progressively a dip in the density of states at the Fermi level. This dip merges into the Peierls gap at the lattice instability temperature. An interesting problem which arises in this connection is the question of the phonon properties relevant to the electron density of states. Since the soft phonon modes become static at the transition temperature it is tempting to think [5-7] that only the static properties determine the forementioned dip in the density of states. While this is obviously true at the very transition temperature, we show that the behavior of the dip in the critical region can involve the dynamic phonon properties, i.e. the dynamical critical behavior. Among three limiting situations, which appear to be interesting in the model examined below, there is only one in which the static structure factor alone determines the electron spectrum. In this limit we recover the previously derived results [5-7]. At temperatures at which the thermal distribution of soft phonons becomes anomalous, the leading term in the first order (Migdal) approximation for electron self energy is Here g2 is the electron-phonon coupling constant, S(co~ is the phonon dynamic structure factor and G the (retarded) Green’s function of one-dimensional electrons. In references [6, 7] this latter was replaced by its value at w’ = 0. Then, after the use of KramersKronig relation, eq. (1) reduces to the starting point of reference [5], in which only the static phonon structure factor was involved from the outset. However this step is justified only if some general criteria on the functions S(c~) and G are satisfied [8]. In order to illustrate this point we choose here the simple form of the dynamic structure factor
31 citations
TL;DR: A short-term trial has been performed under double-blind conditions in 50 adult patients with rheumatoid arthritis to compare diclofenac sodium with both indomethacin and placebo for efficacy and tolerability.
Abstract: A short-term trial has been performed under double-blind conditions in 50 adult patients with rheumatoid arthritis to compare diclofenac sodium (Voltaren) with both indomethacin and placebo for efficacy and tolerability. The duration of the trial was two weeks and was a between-patient comparison of 25 mg t.i.d. diclofenac sodium, 25 mg t.i.d. indomethacin or placebo using a double-dummy technique. Forty-eight patients completed the trial. In the majority of parameters examined, diclofenac sodium was superior to placebo and indomethacin in therapeutic effect. One patient was withdrawn from the trial because of intolerance to indomethacin and one other because of severe joint pain under indomethacin therapy. Neither active compound caused clinically significant changes in blood picture or urine analysis.
27 citations
TL;DR: In this paper, a simple graphical method is presented for determining the non-bonding molecular orbitals in conjugated hydrocarbons, and graph transformations which leave the number of nonbonding MO's unchanged are also shown.
25 citations
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20 citations
01 Sep 1975
TL;DR: The changes of the haem-pocket structure found for both methaemoproteins support the idea that proteins change their conformation by their binding to the solid surface, although in opposite ways.
Abstract: The influence of the binding of methaemoproteins to latex particles with respect to protein conformation was examined using the longitudinal magnetic relaxation rates of solvent protons. The temperature dependences of the paramagnetically induced molar relaxation rates in bound metmyoglobin samples as well as their absolute values suggest an opening of the haem-pocket. The decrease of the same parameter for the immobilized methaemoglobin points to a smaller haem-pocket accessibility with respect to that in the solution. The changes of the haem-pocket structure found for both methaemoproteins support the idea that proteins change their conformation by their binding to the solid surface, although in opposite ways.
20 citations
TL;DR: Substrate competition studies showed that only a non-specific acid phosphatase is responsible for the hydrolysis of ATP, and suggests the existence of two enzymes with different affinities for the substrates, or one enzyme with at least two active sites.
18 citations
TL;DR: It is energy metabolism which explains the physiological function of liver fluke arginase and the nature of the production and excretion of urea and proline noticed in Fasciola hepatica.
Abstract: 1. 1. Fasciola hepatica possesses a very active arginine catabolic path. Cytosolial arginase hydrolyses exogenous arginine to ornithine and urea. 2. 2. Very active mitochondrial ornithine-alanine transaminase and Δ 1 -pyrroline-5-carboxylate reductase convert ornithine into proline. 3. 3. Urea and proline are true metabolic end products of arginine metabolism. 4. 4. The only benefit for the parasite from these reactions could be the regeneration of NAD during the conversion of Δ 1 -pyrroline-5-carboxylate into proline. 5. 5. It is energy metabolism which explains the physiological function of liver fluke arginase. 6. 6. The great activity of the arginine catabolic path explains the nature of the production and excretion of urea and proline noticed in Fasciola hepatica .
TL;DR: The patients with cancer of the larynx at the Ear, Nose and Throat Department in Zagreb during the period from 1945 to 1972, and the cases of laryngeal cancer at the Institute of Public Health of Croatia, were examined epidemiologically.
Abstract: The patients with cancer of the larynx at the Ear, Nose and Throat Department in Zagreb during the period from 1945 to 1972, and the cases of laryngeal cancer at the Institute of Public Health of Croatia, were examined epidemiologically. The patients were from all parts of Croatia (west and south part of Yugoslavia) with the characteristics of Mediterranean and Continental climate.
The following factors were discussed: age and sex distribution, localization of the tumor in three compartments of the larynx, relationship between the villages and cities, occupation (peasants, workers and intellectual people), histologic types and the etiological factors (smoking and alcohol).
TL;DR: The quasi-one-dimensional conductor K 2 Pt/CN/Br 0.3 ·3H 2 (KCP) exhibits a specific heat anomaly in the temperature range around 123 K as discussed by the authors.
01 Jan 1975
TL;DR: A group of 35 carbon-black workers were examined twice within a period of 6 years, with both FVC and FEV1 values deteriorated significantly, the average annual decline of FVC being four and ofFEV1 more than three times higher than those expected for the normal male population.
Abstract: A group of 35 carbon-black workers were examined twice within a period of 6 years. Gravimetric determination of total and respirable particles and particle size analysis of thermal precipitator samples were used to assess the exposure level. The forced vital capacity (FVC) and forced expiratory volume in the first second (FEV1) were measured and X-rays were taken of each subject. Within the period of 6 years both FVC and FEV1 values deteriorated significantly, the average annual decline of FVC being four and of FEV1 more than three times higher than those expected for the normal male population. Radiological lung changes found in 17.1% of the workers progressed during the observation period.
01 Jan 1975
TL;DR: In this paper, the authors present some recent work on two of such theorems, the Hurewicz and the Whitehead, which is an improvement of the ANR-system approach.
Abstract: Publisher Summary At the present state of development of shape theory, it is natural to look for the shape theoretic analogs of classical theorems of homotopy theory This chapter presents some recent work on two of such theorems—the Hurewicz and the Whitehead theorems It is well known that shape theory was first introduced by K Borsuk for compact metric spaces Since then shape theories for various other classes of spaces have been developed If one has in mind establishing theorems of the Hurewicz and Whitehead type, then the most suitable approach to shape theory appears to be the one based on pro-homotopy This approach is an improvement of the ANR-system approach
01 Dec 1975
TL;DR: A microsurgical technique for the separation of germ layers in two- and three-layered rat embryonic shields is described.
Abstract: A microsurgical technique for the separation of germ layers in two- and three-layered rat embryonic shields is described.
TL;DR: In this paper, the influence of head-to-head defects on the vibrational properties and vibrational spectra of planar zig-zag poly(vinyl chloride) has been studied.
01 Feb 1975
TL;DR: The angular dependence of the light scattered by monodisperse barium sulfate particles was determined at wavelengths of light 546 and 436 nm in this paper, and the results were discussed on the basis of the Rayleigh-Debye theory, and experimental and theoretical values of P (ϑ) factors for ellipsoidal particles are compared.
Abstract: The angular dependence of the light scattered by monodisperse barium sulfate particles was determined at wavelengths of light 546 and 436 nm. The particles had the shape of prolate ellipsoids of revolution with different axial ratios. The results are discussed on the basis of the Rayleigh—Debye theory, and experimental and theoretical values of P (ϑ) factors for ellipsoidal particles are compared
TL;DR: Im Ohrknorpel der Ratte werden feine, intracytoplasmatische, 60–70 Å dicke Filamente beobachtet, welche, parallel zueinander angeordnet, die Oberfläche der in den Knorpelzellen enthaltenen Fetttropfen überziehen.
Abstract: Im Ohrknorpel der Ratte werden feine, intracytoplasmatische, 60–70 A dicke Filamente beobachtet, welche, parallel zueinander angeordnet, die Oberflache der in den Knorpelzellen enthaltenen Fetttropfen uberziehen.
TL;DR: In this paper, the behavior of some aromatic tri-and tetraoxo compounds and their derivatives under electron-impact has been investigated by means of high and low resolution mass spectrometry, metastable refocusing and deuterium labelling.
Abstract: The behaviour of some aromatic tri- and tetraoxo compounds and of their p-substituted derivatives under electron-impact has been investigated by means of high and low resolution mass spectrometry, metastable refocusing and deuterium labelling. Some characteristic fragmentation processes observed with these compounds indicate that their molecular ions exist in the enol form. The formation of principal fragment ions is discussed.
TL;DR: It is shown that alloxan inhibits binding of SITS to liver cells, which indicates the cell membrane as a site of alloxans action.
Abstract: It is shown that alloxan inhibits binding of SITS to liver cells. This indicates the cell membrane as a site of alloxan action. Alloxan is found to react with tissues to form complexes that are detectable up to 3 hrs after alloxan treatment. On the basis of the present findings, an assumption is made that alloxan inhibits a cell membrane processes by blockade of functionally important groups.
TL;DR: The d → d' crossover in the anisotropic free Bose gas is considered in this article, and the results agree with the renormalization group solution in the range of d' ≽ 2, where this solution exists.
Abstract: The d → d' crossover in the anisotropic free Bose gas is considered. The results agree with the renormalization group solution in the range of d' ≽ 2, where this solution exists and extend its validity to values of d' < 2. It is conjectured that for d' = 1, n = 2 the crossover critical index equals two.
TL;DR: In this paper, the anionic [Cu(HR)R] − species was predominantly extracted, forming associated ion-pairs with tetraphenylarsonium or the phosphonium cation.
TL;DR: In this article, the extraction of titanium(IV) thiocyanate complexes by monooctyl-α-anilinobenzylphosphonate (MOABP) dissolved in chloroform has been investigated as a function of hydrochloric and sulfuric acid concentration.
TL;DR: In this paper, a study was made of the intensity of scattering of monochromatic X-rays at small angles from Al-3.6 at. % Ni and Al-0.26 at.
Abstract: A study was made of the intensity of scattering of monochromatic X-rays at small angles from Al-3.6 at. % Ni and Al-0.26 at. % Sn solid solutions, in order to determine if the solutes are really dispersed. Electron-microscopic examinations were also carried out. Both alloys were obtained by rapid quenching from the melt in order to obtain the optimum dissolution. However, perfectly homogeneous solid solutions were not obtained, but agglomerations of solute atoms were detected. The evolution of clusters during annealing was examined. Their influence on microhardness and microstrain properties is discussed.
TL;DR: Von bei Mäusen erzeugten Teratomen und Teratocarcinomen entstehen in der Hälfte der Fälle ungefähr gleich häufig bösartige wie gutartige Mischtumoren.
Abstract: Von bei Mausen erzeugten Teratomen und Teratocarcinomen entstehen in der Halfte der Falle ungefahr gleich haufig bosartige wie gutartige Mischtumoren. Bei der Punktion und der nachfolgenden cytologischen Untersuchung war es jedoch nicht moglich, aus den Abstrichen maligne und benigne Tumoren zu trennen.