Showing papers by "University of Zagreb published in 1969"
TL;DR: Les feuillets du cylindre-Æuf du rat ainsi détachés retiennent leur pouvoir de croissance and de différenciation comme homogreffes, sous the capsule rénale.
Abstract: Les feuillets du cylindre-AEuf du rat ont ete disjoints par une solution composee de deux enzymes: 0,5% de trypsine et 2,5% de pancreatine. La separation a ete achevee par une aiguille de tungstene. Les feuillets ainsi detaches retiennent leur pouvoir de croissance et de differenciation comme homogreffes, sous la capsule renale.
70 citations
TL;DR: In this article, the application of birefringent coatings to plane-stress problems associated with orthotropic-glass-reinforced plastic materials is treated, and an example of a nonsymmetric stress distribution associated with a symmetric fringe pattern is covered.
Abstract: The application of birefringent coatings to plane-stress problems associated with orthotropic-glassreinforced plastic materials is treated. The improvement in the sensitivity of the birefringent-coating method due to the high strength and low modulus of the glassfiber-reinforced plastic materials is noted. Next, the effect of a mismatch in Poisson's ratio between the specimen material and coating is examined and a correction factor is developed which permits determination of boundary stresses even when the mismatch is large. Finally, the stress-strain relations for an orthotropic material are reviewed and an example of a nonsymmetric stress distribution associated with a symmetric fringe pattern is covered.
39 citations
22 citations
21 citations
TL;DR: A spectrophotometric method was elaborated for the determination of copper in serum and urine, using a very sensitive organic reagent: 1,5-diphenylcarbohydrazide, which is strongly specific for copper in the conditions described.
18 citations
TL;DR: In this article, the mechanism of dissolution and deposition of bismuth was studied by the galvanostatic method on the stationary drop of Bi amalgam in a Bi 3+ ion solution in HClO 4 and HCl, in mixed electrolytes (HClO4 + HCl), with addition of surface-active substances (phenol and gelatin).
16 citations
TL;DR: In this paper, a method for determination of zinc in serum or plasma, red cells or urine is proposed, where only 0.5 ml of serum or 2 ml of urine is necessary.
16 citations
15 citations
TL;DR: In this article, cyclopropylcarbinyl (I) and cyclobutyl (II) mesylates were solvolysed in aqueous diglyme with or without added NaBH 4 under a variety of conditions.
14 citations
01 Jan 1969
14 citations
TL;DR: A new method for the determination of serum iron and iron-binding capacity with haematoxylin as a specific reagent is proposed and is more sensitive than other reagents previously used for iron.
TL;DR: The morphological picture, the time-course and the interrelationship of the three types of reaction suggest that in addition to a presumed cytopathic effect of the virus, an important role in the pathogenesis of this process may be played by immunobiological mechanisms.
TL;DR: The investigations of the cell inclusions showed that this virus represented a strain of the HRV, and Electron micrographs of ultrathin sectioned material demonstrated that these plates were formed by virus particles lying perpendicularly to the layers of the plates.
Abstract: A virus having 300 nm long rod-shaped particles was isolated fromPlantago media L. in Yugoslavia. The virus was transmitted to 15 species of host plants the symptoms of which are described in detail. The symptoms corresponded to those that appeared after infection by the original Holmes' ribgrass virus (HRV). The investigated virus was compared both with the common strain of tobacco mosaic and the original Holmes' ribgrass viruses by means of serological tests. The agar double-diffusion tests showed that it is closely related to HRV and remotely related to the common strain of TMV. On the basis of these results we concluded that this virus represented a strain of the HRV. The investigations of the cell inclusions showed that our virus produced rounded plates instead of hexagonal prisms. Electron micrographs of ultrathin sectioned material demonstrated that these plates were formed by virus particles lying perpendicularly to the layers of the plates. The presence of plates also points to the fact that the investigated virus belongs to the HRV.
TL;DR: A kinetic method for the assay of urease and urea is reported in this article, where the change in absorbance is due to a pH shift from neutral to alkaline caused by the enzyme hydrolysis of urea.
Abstract: A kinetic method for the assay of urease and urea is reported. The method measures the change of absorbance with time of the indicator phenol red. The change in absorbance is due to a pH shift from neutral to alkaline caused by the enzyme hydrolysis of urea. The method is also suitable for kinetic studies of deaminase enzyme systems.
01 Jan 1969
TL;DR: In this paper, Presbycusis and retrocochlear structures are discussed and the authors propose a method to detect the presence of retro-Cochlear cochlear implant.
Abstract: (1969). Presbycusis and Retrocochlear Structures. International Audiology: Vol. 8, No. 2-3, pp. 210-220.
TL;DR: In this article, an Al-rich Al-Fe alloy, obtained by rapid quenching from the liquid, containing 0.68 at.% (1.4 wt%) Fe in metastable solid solution was investigated by means of electron microscopy and electron microprobe analysis.
TL;DR: The San Isidro district of northern Guayana is one of the richest iron-bearing regions of the world as discussed by the authors, with estimated reserves of 2,000 million tons.
Abstract: The iron ore deposits of Cuadrilatero Ferrifero de San Isidro represent the largest iron ore reserves in Venezuela. The district is a part of the iron metallogenic province of northern Guayana, one of the richest iron-bearing regions of the world. All presently known iron ore deposits of Venezuela are situated within this province: Cerro Bolivar, Altamira, Rondon, San Isidro, Maria Luisa, El Pao and others. Their total ore reserves amount to 2,000 million tons (disregarding the unenriched or slightly enriched iron-formation). The Imataca belt to which the iron ore deposits are confined consists of metamorphosed sedimentary and igneous rocks of Early Precambrian age, the oldest rocks presently known in South America. This belt extends some 450 km from the Orinoco delta southwesterly to the Cauro River. Iron ore is formed from banded iron-formation, a member of the Imataca complex, by removal of silica. The process of supergene enrichment is controlled to a certain degree by structural elements. There are five ore bodies in the San Isidro district, extremely varied in shape and size. Single bodies extend up to 3–4 km in length, approximately parallel to the regional structure pattern, and a few hundred meters in width. The morphology of the bottom of the ore bodies is rather irregular, particularly in transversal sections. Contacts between ore and the unaltered iron-formation beneath are gradational. Maximum vertical section through ore is 260 m; the average is 60 m approximately. The stratigraphic thickness of iron formation has been magnified by structural deformations. The primary stratigraphic thickness is estimated to be some 50–150 m. The iron ore is classified into two main types: a) hard, crustal ore, b) soft, friable ore. Hematite grains which remained after the leaching of silica, and goethite (as cement) are the two main constituents of crustal ore. Hematite and magnetite and a minor amount of quartz are almost the only constituents of friable ore. The crustal ore forms a 15–60 m thick mantle covering friable ore. The overall volume ratio between the friable and the crustal ore is about 2:1. However, it varies in different zones. The mean composition of iron ore on the basis of 10,800 chemical analyses is 64.41% Fe, 2.62% SiO2, 0.6% Al2O3. The ore contains a minor amount of Mn, P, Ti (no S, As, Ba). The ore reserves amount to 750 million tons; in addition, 180–300 million tons of possible ore reserves are estimated.
TL;DR: Human haptoglobin complex and protein-hemoglobin complexes in plasma from 115 normal persons and patients with hypo-, hyper-, and ahaptoglobinemia were investigated by two-dimensional electrochromatography on alter paper sheets at pH 7.0, and hemoglobin was found to be bound also to γ-globulins (γ-GHb).
TL;DR: For standardized epidemiological comparisons, blood sugar measurements after glucose loading should be adapted and so arranged that the validity of the screening phase may be assessed, and a quantitative approach to the analysis of relationship between the continuously varying blood sugar level and other epidemiological characteristics of the population has been neglected.
Abstract: The results are presented of a diabetic survey in Zagreb where, in a typical population sample from five General Practice Units, 88.9% of the total number of inhabitants aged over 15 (9176) were examined. The examination in the screening phase comprised the determination of blood sugar 1–2 h after the largest daily meal. — The results are analysed from technical, sociomedical, and epidemiological aspects. 1. For standardized epidemiological comparisons, blood sugar measurements after glucose loading should be adapted and so arranged that the validity of the screening phase may be assessed. 2. All blood sugar distributions proved unimodal, continuous, and positively skewed. Consequently, all critical diagnostic values are necessarily arbitrary and of greater importance to group than individual diagnosis. The OGTT results in so-called borderline cases proved unreliable in the course of time. Classifications based upon single determinations are inadequate. 3. In the epidemiological studies of diabetes, a quantitative approach to the analysis of relationship between the continuously varying blood sugar level and other epidemiological characteristics of the population, has been neglected. The use of this approach in the Zagreb Diabetes Survey promises further refinements in the understanding of the importance of glucose tolerance in complete populations.
TL;DR: In this article, the authors applied X-ray contact microradiography to flakes of Al-Fe alloys of different iron concentrations obtained by rapid quenching from the melt.
01 Dec 1969
TL;DR: These observations support the hypothesis that in normal hydra the interstitial cells formed by the dedifferentiation of gland cells pass into the ectoderm of the tentacles through endodermal cells and the coelenteric fluid.
Abstract: Asexual, non-budding hydras were treated in the 1∶75000 solution of E 39 solubile (Bayer). They were feeding, growing and budding for six days. The interstitial cells found in the ectoderm at the moment of treatment differentiated into cnidoblasts during that period. The cells that happened to be in the gastroderm at that time, differentiated into interstitial cells which were not able to cross the mesoglea due to the E 39 activity. In the gastroderm a great number of cnids appeared.
01 Jan 1969
TL;DR: The authors show that economic development does not follow a single line of an elegant "take off" but that there are several turning-points in the main trends of development, many pitfalls of structural changes, and those of policy changes to match.
Abstract: The purpose of this paper is threefold: To show that economic development does not follow a single line of an elegant ‘take off’, but that there are several turning-points in the main trends of development, many pitfalls of structural changes, and those of policy changes to match.
01 Jan 1969
TL;DR: Four women lacking secondary sexual characters with infantile genital organs, a eunuchoid build and absent or very low urinary pituitary gonadotrophins are suffering from primary hypogonadotrophic hypogOnadism.
TL;DR: In a group of samples with normal and elevated concentrations of bilirubin, good agreement was obtained only between the methods of Huang and of Abell, and in a group with individual discrepancies between results, no correlation was observed between these discrepancies and the level of bilIRubin.
TL;DR: In 1906 in America Crile published his work “Excision of Cancer of the Head and Neck”, in which he published the enormous total of 4500 cases of the cancer of the head and neck, deceased because of the uncured primary tumour or the metastases of the neck, and only 1 % because of distant metastases.
Abstract: It is a fact that only one per cent of patients with the cancer of the head and neck die from the distant metastases. For that reason great hope has been laid on neck dissection. The results so far show that after neck dissection 30-35 per cent of the patients remain alive. According to their personal observation the authors tried to explain this problem.In 1906 in America Crile published his work “Excision of Cancer of the Head and Neck”, in which he published the enormous total of 4500 cases of the cancer of the head and neck, deceased because of the uncured primary tumour or the metastases of the neck, and only 1 % because of distant metastases. In his series, although small, he proved that the patient with cancer of the head or neck in addition to excision of the primary lesion, had a 25 per cent better chance of living for three years without disease than one treated surgically for the primary lesion only.
TL;DR: In this paper, the potential/time curves of single crystals of p-and n-type, and with different crystal faces contacting alkaline solution, were investigated galvanostatically.
01 Jan 1969
TL;DR: The question "Is Marx a philosopher at all?" still arouses controversy as discussed by the authors, and not all possible answers to it are equally good. But this does not mean that every possible answer to it is equally good either.
Abstract: Discussion on Marx as philosopher is not reduced to the question: ‘What are the main themes and theses of Marx’s philosophy?’, ‘What is the essential meaning of his philosophical thought?’, ‘What is the historical value and importance of his philosophical work?’. The question ‘Is Marx a philosopher at all?’ still arouses controversy. There is nothing wrong with the question. But this does not mean that every possible answer to it is equally good.