Showing papers by "University of Zagreb published in 1986"
TL;DR: The prenatal development of histochemical reactivity in the nucleus basalis complex, a magnocellular complex known to contain a high concentration of cholinergic perikarya, is analyzed to provide parameters for study of the "cholinergic" innervation of a human fetal cerebrum.
145 citations
TL;DR: This paper presents an empirical study of the relations between scientific output and collaboration performed on two scales: an individual scale, for members of a study model, and a group Scale, for three samples varying in the level of productivity.
Abstract: This paper presents an empirical study of the relations between scientific output and collaboration performed on two scales: (1) an individual scale, for members of a study model, and (2) a group scale, for three samples varying in the level of productivity. The rank approach was applied in the preparation of the study model resulting in the selection of a set of the most prolific authors. In the course of that process, multiple authorship problem was solved by a dual approach, consisting of “normal count” and “modified straight count” procedures. As shown by the analysis of collaborative patterns, either on individual or on group scales, scientific output is highly dependent on the frequency of collaboration among the same authors. Expressed as “the collaboration measure”, it might serve as an indicator in comparative analyses of scientific productivity in a given field of science.
87 citations
TL;DR: In this paper, the physicochemical characterization of uranium(VI) in seawater is described on the basis of species distribution calculations and experiments using polarography and spectrophotometry.
Abstract: The physicochemical characterization of uranium(VI) in seawater is described on the basis of species distribution calculations and experiments using polarography and spectrophotometry in artificial seawater at elevated uranium concentrations. Various dissolved uranium(VI) species are identified under different conditions of pH and carbonate concentration. Below pH 4, the hydrated uranyl ion is present in the free state (forming labile complexes). Above pH 4, a stepwise coordination of uranyl by the carbonate ion occurs. The monocarbonate complex is formed in the pH range 4-5, the bicarbonate uranyl complex between 5 and 6. Above pH 8, uranium is present predominately as the tricarbonate and to a smaller extent as a trihydroxide complex. There is satisfactory agreement between our experiments and the theoretically computed distribution of uranium(VI) in seawater based on published stability constants. The experiments done at higher concentrations are justified by theoretical distributions showing that there is no great difference in species distribution between the uranium at concentrations of 10/sup -4/ and /sup -8/ mol dm/sup -3/.
86 citations
TL;DR: In this article, young cats were subjected to a temperature of -30 degrees C for two periods of 1 hr per day for two weeks. Animals were sacrificed on the 7th day and adipose tissue from the perirenal, pericardial, axillary, interscapular, and subcutaneous-inguinal depots was examined by electron microscopy and analyzed stereologically.
74 citations
TL;DR: In this paper, it was shown that the one-dimensional model of elastic beam is an approximation to the three-dimensional linear theory of elasticity, and that the model can be seen as an extension of the model of the elastic beam.
Abstract: In this paper we prove that the one-dimensional model of elastic beam is an approximation to the three-dimensional linear theory of elasticity.
63 citations
TL;DR: The function of LC is markedly and progressively impaired in acute GVHD; LC function is also decreased, but to a lesser extent, following x-irradiation alone; and Ia+ keratinocytes from lethally irradiated mice undergoing GV HD do not exhibit antigen-presenting capacity.
50 citations
TL;DR: In this article, it was shown conclusively that the violet bands of sodium ( ≈ 425-460 nm) arise from the superposition of two distinct continuum emission bands - one singlet (2 1 Σ + u → X 1 ξ + g ) and one triplet (primarily 2 3 Π g → 1 3 ξ u + ).
50 citations
TL;DR: The fetal lateral amygdaloid nucleus contains a number of cytoarchitectonic “moduli” which could serve as a new parameter for an estimation of histogenetic maturity of the human amygdala.
Abstract: The cytoarchitectonic development of the lateral amygdaloid nucleus has been studied on Nissl-stained sections through brains of human fetuses ranging between 11 to 24 weeks of gestation. The first sign of cytoarchitectonic inhomogeneity of the lateral amygdaloid nucleus is the appearance of 2-3 ovoid cell clusters around 12 weeks of gestation. Between 12.5-16 weeks of gestation, the ventral part of the lateral amygdaloid nucleus contains 7-11 columnar cell clusters separated by "septa" of lower cell-packing density. These columnar clusters, stretching in the rostrocaudal direction, appear on cross-section as ovoid structures elongated in the ventrodorsal direction. In subsequent development (16-24 weeks of gestation) this distinct columnar appearance becomes less obvious, owing to the disappearance of "septa" along the dorsal edges of cellular clusters. This process begins first in the medial part of the columnar field. As a result, the cytoarchitectonic units gradually fuse into a homogeneous grey mass. However, the ventral part of the columnar field retains an undulated appearance throughout late gestation, showing multiple indentations as a sign of former cytoarchitectonic inhomogeneities. In conclusion, the fetal lateral amygdaloid nucleus contains a number of cytoarchitectonic "moduli" which could serve as a new parameter for an estimation of histogenetic maturity of the human amygdala. This transient cytoarchitectonic inhomogeneity could be a sign of the temporary predominance of one characteristic afferent-efferent system during a given developmental stage. Alternatively, it could reflect a clustered type of neurogenesis.
49 citations
TL;DR: In this article, a sample of colloidal anatase (TiO 2 ) consisting of spherical particles of narrow size distribution, dispersed in aqueous solutions of varying pH at constant concentrations of NaNO 3, was found to be at pH 4.4 and the point of zero charge at pH 6.5.
48 citations
TL;DR: In this paper, the effect of neutral electrolytes on particle detachment was analyzed theoretically and experimentally, and it was shown that the removal of spherical colloidal hematite particles from glass surface in basic media is enhanced with increasing concentration of NaNO3 under these conditions both surfaces (of particles and of glass) are negatively charged.
46 citations
TL;DR: The existence of sex related differences in the response of mice, rats and cats to administration of picrotoxin might have its origin in the dimorphisms of the GABA system in these animal species.
TL;DR: In this paper, the structure and regiochemistry of dehydro-allantoins were established by chemical, spectroscopic, and 14C-labelling methods, in combination with other data, generate a new mechanistic scheme for the uricolytic pathway to allantoin, ruling out the intervention of a symmetrical transition state prior to decarboxylation step.
TL;DR: It is concluded that the model of gastric lesions induced by dopamine antagonists could be successfully applied in further investigations of the role of dopamine in the pathogenesis of ulcer disease.
TL;DR: In this article, the Newton diagram is used to get information about the first terms of the Puiseux expansions of the eigenvalues λ(e) of the perturbed matrix pencil.
Abstract: As in [N], [LN] the Newton diagram is used in order to get information about the first terms of the Puiseux expansions of the eigenvalues λ(e) of the perturbed matrix pencilT(λ, e)=A(λ)+B(λ, e) in the neighbourhood of an unperturbed eigenvalue λ(∈) ofA(λ). In fact sufficient conditions are given which assure that the orders of these first terms correspond to the partial multiplicities of the eigenvalue λ0 ofA(λ).
TL;DR: The addition of BA to the medium for E callus induction significantly enhanced embryogenic callus formation as well as necrosis, and the best shoot and plant development from embryoids was achieved on MS medium supplemented with 3 µM TIBA.
TL;DR: The World Health Organization provides guidance on the training of general practitioner and expert sonographer that is necessary for proper implementations of this technology.
Abstract: In many developing countries ultrasound services are either nonexistent or inadequate, although the diagnostic problems for which ultrasound is particularly suited are common in such countries. In view of this, the World Health Organization (WHO) has outlined the indications for diagnostic ultrasound together with the technical specifications for equipment. Where there are larger hospitals the basic ultrasound services should be complemented with the proposed general-purpose ultrasound scanner while at the level of major medical centres there will be need for a variety of special purpose ultrasonic units, e.g. for cardiac, intraluminal and interventional investigations. The usefulness of any ultrasound appliance depends to a great extent on the skill and experience of the operator. Therefore, WHO provides guidance on the training of general practitioner and expert sonographer that is necessary for proper implementations of this technology. In this review the authors discuss the various problems affecting the use of ultrasound in developing countries.
TL;DR: In this paper, the elastic electron reflectivity of clean and hydrogen-covered Pd(100) and the primary energy dependence of the hydrogen vibrational cross sections are reported, and compared to earlier results for Pd (100) H.
TL;DR: A restriction of developmental capacities is suggested in groups of embryonic cells at this developmental stage of the pregastrulation or preprimitive streak embryo (primitive or primary ectoderm).
Abstract: Experimental results obtained many years ago revealed that during gastrulation (with the primitive streak and the mesoderm formation as distinct features) the early rodent embryo undergoes essential changes in its response to extrinsic teratogens (Russell & Russell, 1954; Wilson, 1954; Skreb, 1961; Skreb & Bijelic, 1962; Skreb & Frank, 1963). It has also been shown that the ultrastructural, histochemical and biosynthetic features of the embryo are subject to substantial changes during this period (Solter, Damjanov & Skreb, 1970, 1973; Dziadek & Adamson, 1978; Bode & Dziadek, 1979; Wartiovaara, Leivo & Vaheri, 1979; Jackson et al. 1981; Franke et al. 1982 a, b ). This suggests a restriction of developmental capacities (i.e. the loss of the capacity of regulation) in groups of embryonic cells at this developmental stage. According to the current concept, the initial cell population from which this restriction starts, resides within the embryonic ectoderm of the pregastrulation or preprimitive streak embryo (primitive or primary ectoderm).
TL;DR: Na+-H+ exchange and Na+-dependent D-glucose transport in the mouse kidney are under control of androgen hormones, which could be in close connection with the wellknown renotropic action of androgens in themouse.
TL;DR: In this paper, it is shown that a worker-managed firm must solve a specific dynamic program in order to maximize per worker income, and a model with equally absurd consequences is constructed for the capitalist firm.
TL;DR: In this paper, the Raman spectrum of the 1-methyl-uracil single crystal was recorded in order to determine the symmetry of the different vibrational modes, and the internal (molecular) spectrum was assigned in accordance with the in-plane and out-of-plane character of the vibrations served, and at the same time, the previously calculated vibrational frequencies were assigned.
TL;DR: The second moments and diamagnetic susceptibilities of some linear van der Waals compounds may be calculated by the simple promolecule model utilizing an atomic monopole approximation for the electronic charge distribution.
TL;DR: This is the first report on Parietaria officinalis‐induced allergy on the east Adriatic coast and patients showed positive cutaneous reactions and had specific IgE antibodies to the respective isolated allergen.
Abstract: Pollen of Parietaria officinalis causes season-associated respiratory symptoms. In Southern Croatia (Yugoslavia) we found 65% patients with rhinitis and/or asthma to be allergic to this pollen. They showed positive cutaneous reactions and had specific IgE antibodies to the respective isolated allergen. The finding represents the first report on Parietaria officinalis-induced allergy on the east Adriatic coast.
TL;DR: In this article, the effects of UV irradiation on the photooxidative degradation of prepared linear polyurethane (PUR) prepolymers were studied. And the difference in behaviour of the two different types of polyester diols used in PUR synthesis were discussed.
TL;DR: In this article, a review of the applications of symmetry arguments in interpreting the electronic and geometric structures of molecules is given, and an analogy between the hybridization model and crystal field theory is found.
Abstract: Brief historical review of the applications of symmetry arguments in interpreting the electronic and geometric structures of molecules is given. The hybridization of atomic orbitals is thoroughly discussed. It was shown that hybridization model describes directional features of covalent bonding and a number of other properties which are not directly related otherwise. This versatility in rationalizing a large number of experimental data of different kinds and a high interpretative power give to the model some semblance of truth. The model's apparently good reflection of molecular properties could be traced to the fact that hybrids conform with the local symmetry of an atom in a molecular environment. An analogy between the hybridization model and crystal field theory is found. The epistemological role of the hybridization is stressed. It provides a bridge between the most elementary first principles of quantum mechanics and the concept of a chemical bond, which is a basic tenet of the phenomenological theory of molecules.
TL;DR: In this paper, a complex, column-and row-cyclic Jacobi-like process of the form A(k+1 ) = U ∗ k A( k )V k + F( k ), k⩾1, where U k, V k are unitary plane matrices, (F ( k )) is a sequence converging to diagonal form, and A ( 1 ) is an arbitrary n × n matrix.
TL;DR: In this article, the parabolic rule for the proton-neutron multiplets is realized when an algebraic distinction is made between the particle-like and the hole-like unpaired nucleons in constructing Bose-Fermi symmetry schemes.
TL;DR: The presence of the five‐membered ring of uric acid (or an opened form thereof) did not abolish and in some compounds enhanced diabetogenic activity and the presence of a quinonoid pyrimidine system or its hydrated equivalent was found.
Abstract: The diabetogenic activity of a range of alloxan-like compounds derived from uric acid has been investigated. The classes of derivatives were: 5-substituted-isouric acids; 4,5-disubstituted-4, 5-dihydrouric acids; 5-substituted-pseudouric acids; salts of dehydro-uramil hydrate; salts of dehydro-isouramil hydrate; alloxan derivatives. Compounds were tested by intravenous injection into rats and diabetogenic activity assessed by production of persistent hyperglycaemia and glycosuria. The only essential structural feature common to all active compounds was the presence of a quinonoid pyrimidine system or its hydrated equivalent. The presence of the five-membered ring of uric acid (or an opened form thereof) did not abolish and in some compounds enhanced diabetogenic activity.
TL;DR: In this article, the IBFFM model was extended to odd-odd nuclei, referred to as OTQM, and a few dynamical symmetries and supersymmetries have been introduced.
Abstract: The levels of198Au have been calculated in IBFFM as a first application of the new model for odd-odd nuclei. The study of the Au (n, γ) spectrum has led to a large amount of data on the odd-odd nucleus198Au, with spin/parity assignments of numerous low-lying states /l/. In particular, fifteen 1−, 2− levels have been found below 500 keV. However, at that time a detailed comparison with nuclear structure theory was not possible. In last decade, the interacting boson model was extensively applied to description of even-even and odd-even nuclei /2,3/. Only recently, this approach was extended to odd-odd nuclei /4–8/. A new model /4,5/ for odd-odd nuclei was introduced, referred to as IBFFM or OTQM. In related development, a few dynamical symmetries and supersymmetries have been introduced, which encompass odd-odd nuclei. These supersymmetries are associated with Uν (6/4)×Uπ (6/4) /6/, Uν(6/12)×Uπ (6/4) /7/ and with a symplectic chain /8/.
TL;DR: In this article, changes in physico-chemical, mechanical and electrical properties of poly(ethylene terephthalate) (PET) films have been exposed to ultraviolet radiation, and the results showed that specific viscosity, tensile strength, elongation at break, relative dielectric constant and dielectoric strength decrease, while the dielectrics loss factor, density, optical density of the ir spectrum band which refers to the trans form of the PET molecule, as well as the quantity of carboxylic end groups, increase.