Showing papers by "University of Zagreb published in 1971"
56 citations
TL;DR: In this article, the region of precipitation of aluminum hydroxide by mixing the aqueous solutions of aluminum chloride (0·03-200 mM) and sodium hydroxides (pH 3·5-11·5) was investigated tyndallometrically at 20°C, 24 hr after mixing at varied ionic strengths.
51 citations
01 Sep 1971
TL;DR: Mouse egg-cylinders of C3H/H strain with two and three germ layers were transplanted under the kidney capsule and developed into well differentiated teratomas and teratocarcinomas, considered as a critical stage when embryonic cells loose their potentiality for uncontrolled growth.
Abstract: Mouse egg-cylinders of C3H/H strain with two and three germ layers were transplanted under the kidney capsule. They developed into well differentiated teratomas and teratocarcinomas. Older embryos developed invariably into teratomas composed of adult tissues only. We consider the period of germ layer inversion as a critical stage when embryonic cells loose their potentiality for uncontrolled growth.
45 citations
TL;DR: In this paper, the solid solubility of nickel in aluminum was extended up to 7.7 at. % Ni by the two-piston cooling technique, and a strengthening was observed in Al-Ni solid solutions and, less pronounced, in flakes which contained the Al 3 Ni phase.
39 citations
TL;DR: Im Pollen vonPinus silvestris L. wurden die androgenen Steroide Testosteron, epi-Testosteron und 4-Androsten-3,7-dion nach vier verschiedenen Methoden bestimmt.
Abstract: Im Pollen vonPinus silvestris L. wurden die androgenen Steroide Testosteron, epi-Testosteron und 4-Androsten-3,7-dion nach vier verschiedenen Methoden bestimmt.
38 citations
TL;DR: Data indicate that embryonal carcinoma cells are cells which did not differentiate, but proliferate, retaining morphologic and probably some functional characteristics of undifferentiated ecto-mesodermal cells from the early postimplantation stages of development.
Abstract: Teratocarcinomas were obtained by transplantation of 7 day old mouse egg-cylinders under the kidney capsule of adult isogeneic animals in order to visualize the histogenesis in the teratocarcinomas. The sequence of histochemical changes roughly corresponds to the events taking place in the developing organism. The origin of differentiated tissues could not be traced histochemically because of the changes which occur in the enzyme pattern during differentiation. No “marker” enzymes were found to enable us to link the differentiated tissues with the undifferentiated embryonal carcinoma cells. The latter cells displayed a low activity of oxydative enzymes and virtually no activity of acid hydrolases, but were rich in alkaline phosphatase. Histochemically they are similar to ecto-mesodermal cells of the egg-cylinder from which the teratocarcinomas were derived. In conjunction with previous ultrastructural findings these data indicate that embryonal carcinoma cells are cells which did not differentiate, but proliferate, retaining morphologic and probably some functional characteristics of undifferentiated ecto-mesodermal cells from the early postimplantation stages of development.
34 citations
TL;DR: 2-Acetamido-2-deoxy- d -mannono-1,4-lactone was isolated and it seems probable that the epimerization involved in the formation of this lactone occurred under the influence of the dicyclohexylamine.
30 citations
TL;DR: The resistivity of AlMn alloys of concentrations up to 5% was found to decrease linearly in temperature above 50 K, while at lower temperatures it follows the same ${T}^{2}$ behavior observed at lower concentrations.
Abstract: The resistivity of AlMn alloys of concentrations up to 5% is found to decrease linearly in temperature above 50 K, while at lower temperatures it follows the same ${T}^{2}$ behavior observed at lower concentrations. The linear behavior of $\ensuremath{\rho}(T)$ rules out the possibility that AlMn is a Kondo system with ${T}_{\mathrm{K}}\ensuremath{\simeq}500$ K. Possible explanations in terms of localized spin fluctuations are suggested.
30 citations
TL;DR: Die innere und die äussere Zellschicht 8 Tage alter Rattenkeimscheiben wurden enzymatisch voneinander getrennt und unter die Nierenkapsel erwachsener Ratten verpflanzt.
Abstract: Die innere und die aussere Zellschicht 8 Tage alter Rattenkeimscheiben wurden enzymatisch voneinander getrennt und unter die Nierenkapsel erwachsener Ratten verpflanzt. Die isolierte innere Zellschicht (primitives Ektoderm) differenzierte sich nicht nur in ektodermale und mesodermale, sondern auch in typisch endodermale Gewebe (Darmepithel). Es wird daraus gefolgert, dass in diesem Entwicklungsstadium die innere bzw. aussere Zellschicht noch nicht als das definitive Ekto- bzw. Endoderm angesehen werden konnen.
30 citations
TL;DR: An attempt to immunize calves against bovine cysticercosis (Cestoda) by intramuscular injection of artificially hatched homologous or heterologous oncospheres of Taenia saginata is made.
29 citations
TL;DR: It was concluded that 2 reacts with dimethylamine to give 2-acetamido-3,4,6-tri- O -benzyl-2-deoxy-di- N -methyl- d -gluconamide, and that this, in turn, is partially epimerized into its d - manno analog.
01 Feb 1971
TL;DR: In this paper, the authors discussed the operation of the two-piston quenching apparatus and concluded that the sample thickness cannot serve as a sufficient criterion for quench effectiveness, and showed that the phase is replaced by Al3Fe after annealing for 10 min at 550°C or for 16 hr at 400°C.
Abstract: The extension of the solid-solubility limit obtained in Al-Fe alloys up to 4.4 at. pct Fe by rapid quenching from the melt and the appearance of metastable Al6Fe phase for 4 to 20 wt pct Fe have been reported in the past. Present experiments with isochronal and isothermal annealing of Al-Fe solid solutions containing 3.6 at. pct Fe have shown that the solutions are very stable at room temperature, and less stable at 200°C, while at 300°C they decompose very rapidly and a metastable Al6Fe phase appears. This phase is replaced by Al3Fe after annealing for 10 min at 550°C or for 16 hr at 400°C. The Al6Fe phase remains stable for 76 hr at 300°C, while taking more than 670 hr to be replaced by Al3Fe. The author discusses the operation of the “two-piston” quenching apparatus and concludes that the sample thickness cannot serve as a sufficient criterion for quenching effectiveness.
TL;DR: In this paper, the formation of cadmium-ethylencdiaminetetraacetic acid (Cd-EDTA) in seawater and in sodium chloride solution has been studied by square-wave polarography.
Abstract: Complex formation of cadmium-ethylencdiaminetetraacetic acid (Cd-EDTA) in seawater and in sodium chloride solution has been studied by square-wave polarography. The rate of Cd-EDTA complex folmation in scawatcr is lower than that of the same reaction in the corresponding solution of sodium chloride or calcium and sodium chloride. The influence of chloride and calcium ions on complex formation of Cd-EDTA in sodium chloride solutions has been investigated and the results indicate that the degree of complex formation of cadmium with EDTA is diminished by the formation of cadmium monochloro complex and by the competition between calcium and cadmium.
TL;DR: Comparison of lung function values measured before work with values obtained in the control group indicates a chronic effect of hemp dust on ventilatory function, and reversibility of acute lung function changes during work.
Abstract: Symptoms of byssinosis were found in 39% of 102 female hemp workers who were nonsmokers. A higher prevalence of chronic bronchitis (P < 0.01) was found in workers with symptoms of byssinosis than in those without such symptoms. In hemp workers, either with or without symptoms of byssinosis, FEV1.0 and FVC significantly decreased during work on the study days, Mondays and Thursdays; significantly lower reductions were registered on Thursdays. Inhalation of metaproterenol sulfate (Alupent) before work significantly diminished FEV1.0 reduction, although not completely preventing it. Metaproterenol inhalation after work significantly increased FEV1.0, indicating the reversibility of acute lung function changes during work. Comparison of lung function values measured before work with values obtained in the control group indicates a chronic effect of hemp dust on ventilatory function.
TL;DR: Data collected from 1960-1975 on a representative sample of the population of the study area, including the Istrian Peninsula and the northern Adriatic littoral, and the control area, the rest of Croatia, indicate that functional psychotic illnesses are more frequent in theStudy area, with the highest rates in older population groups.
Abstract: This is the fourth paper in a series on the epidemiology of psychoses in Croatia, Yugoslavia. Data collected from 1960-1975 on a representative sample of the population of the study area, including the Istrian Peninsula and the northern Adriatic littoral, and the control area, the rest of Croatia, indicate that functional psychotic illnesses are more frequent in the study area, with the highest rates in older population groups. The finding is not associated with coastal or inland residence, with educational level, or with occupational group. Other diseases in excess in the study area are diabetes mellitus, psoriasis, and alcoholism. Nutritional disorders are about equally distributed between study and control areas. Data on extent of cigarette smoking was more prevalent in the study area, cases of functional psychoses smoked no more than the general population.
TL;DR: Yugoslav isolates resemble the type strain in host range, symptoms, physical properties, particle morphology and flea-beetle transmission and are serologically closely related to thetype strain, but did not infect radish and are designated as the European strain.
Abstract: SUMMARY
Fields of turnip (Brassica rapa L. var. rapa) in Yugoslavia often contained plants infected with radish mosaic virus (RaMV). Yugoslav isolates resemble the type strain in host range, symptoms, physical properties, particle morphology and flea-beetle transmission and are serologically closely related to the type strain, but did not infect radish and are designated as the European strain. Light microscopy of infected turnip and some other cruciferous species revealed the characteristic inclusion bodies in the cytoplasm.
TL;DR: In this article, the synthesis of CuSe and the examination of prepared samples by means of density measurements, Debye-Scherrer analysis and measurement of its electrical properties are described.
Abstract: This paper describes the synthesis of CuSe and the examination of prepared samples by means of density measurements, Debye-Scherrer analysis and measurement of its electrical properties. Considering the temperature-dependence of electrical conductivity and the values of thermoelectric power and the Hall constant, one may conclude that synthetic klockmannite behaves as a metal.
TL;DR: Einmalige i.p. Gabe von Tetrazyclin in sublethaler Dose führt zur Verfettung der Rattenleber und die Dilatation and Vesikulation des Endoplasmatischen Retikulums und the Quellung der Mitochondrien sind die auffälligsten, Veränderungen die der Verfittung der Leberzellen vorausgehen.
Abstract: Einmalige ip Gabe von Tetrazyclin in sublethaler Dose fuhrt zur Verfettung der Rattenleber Die Dilatation und Vesikulation des Endoplasmatischen Retikulums und die Quellung der Mitochondrien sind die auffalligsten, Veranderungen die der Verfettung der Leberzellen vorausgehen Diese Veranderungen sind unspezifisch und reversible
TL;DR: Appreciable amounts of free and bound hydroxyproline were found in the tissue fluid obtained by centrifugation from calf costal cartilage, and the presence of an enzyme capable of splitting synthetic collagenase substrate at pH 7.4 and 37° was demonstrated.
TL;DR: In this paper, the sum rules emerging from the conventional dispersion relations, phase dispersion and dispersion relation for the inverse amplitudes are studied in terms of kaon-nucleon forward scattering parameters.
Abstract: Sum rules emerging from the conventional dispersion relations, phase dispersion relations and dispersion relations for the inverse amplitudes are studied in terms of kaon-nucleon forward scattering parameters. Solutions for ΛK N and ΣK N coupling constants and zeros in the complex ω-plane of bothT+ andT− kaon-nucleon amplitudes are obtained. The consistency of these solutions is then tested by predictions for other both low- and high-energy scattering parameters.
TL;DR: F Fasciola hepatica is unable to convert benzoic acid to either ornithuric acid or hippurics acid and Moniezia benedeni synthesizes hippuric Acid only to a limited extent.
TL;DR: This unusual tumour caused precocious puberty coupled with virilization and high choriogonadotrophic activity in a girl 7½ years old and was termed a terato‐chorio‐gonadoblastoma.
TL;DR: The first measurements on the superconducting transition temperature in ultrarapidly quenched samples of Al-Fe supersaturated alloy as a function of residual resistivity ratio are presented in this paper.
Abstract: The first measurements on the superconducting transition temperature in ultrarapidly quenched samples of Al-Fe supersaturated alloy as a function of residual resistivity ratio are presented. Their comparison with earlier results for dilute alloys and possible explanations of their behaviour are given.
TL;DR: In this paper, the two-body parity-nonconserving potential deduced on the basis of several weak interaction Hamiltonians was calculated using the Feynman-diagram analysis and the relative contributions from various nuclear single-particle states have been analyzed in detail.
Abstract: Circular $\ensuremath{\gamma}$ polarization in heavy nuclei (${\mathrm{Ta}}^{181}$, ${\mathrm{Lu}}^{175}$) has been calculated using the two-body parity-nonconserving potential deduced on the basis of several weak-interaction Hamiltonians. Gauge invariance was elucidated by the Feynman-diagram analysis. The relative contributions from various nuclear single-particle states have been analyzed in detail. Short-range correlations have been approximately taken into account. Our calculation is compared with earlier calculations. According to our calculations, the Cabibbo conventional weak-Hamiltonian model seems to disagree with the ${\mathrm{Ta}}^{181}$ experiment. Other models allowing for extra neutral curents, such as d'Espagnat and the Lee model, might agree with experimental results. This conclusion depends on the sign of the theoretical result, which cannot be fixed with absolute certainty. The Oakes model seems to give absolute values which are too large.
TL;DR: It was found that castration in mice resulted in a decrease of urine output, an increase of sodium concentration in urine without a change in potassium concentration, and a significant increase of the specific activity of (Na + −K + )-ATpase.
TL;DR: Phytosphingosine, D(+)-ribo-2-amino-1, 3, 4-trihydroxyeicosane, is synthesized through the following intermediates: 2-Methoxyoctadecanoic acid chloride, DL-ribo, and DL-xylo.