Showing papers by "University of Ljubljana published in 1977"
TL;DR: Using the reduced CO difference spectra, the enzyme cytochrome P-450 is located in the membrane fraction sedimenting at 105.000 g and the hydroxylating system in Rhizopus nigricans was found in post-mitochondrial supernatant.
65 citations
TL;DR: Trickle-bed as mentioned in this paper is a type of the second classification in which both gas and liquid flow downward through the catalyst bed and avoid the disadvantage of separating small catalyst particles from the fluid product streams associated with slurry reactors, and also avoid the limitation of flow rates uncountered with upflow or countercurrent flow through fixed beds.
Abstract: For reactions necesitating a solid catalyst and which invoive both reisuvely volatile and nonvclarile reactants, three-phase reactirs are required. Equipment used to achieve intimate contacting of the three phases has been procominantly in the form of slurry reactors, analogous to the stirred-tank homogenous system, or fixed-bed reactors in which the two fluid phases flow through a stationary bed of catalyst particles. Trickle-bed reactors are a type ofthe second classification in which both gas and liquid flow downward through the catalyst bed. Such systems avoid the disadvantage of separating small catalyst particles from the fluid product streams associated with slurry reactors, and also avoid the limitation of flow rates uncountered with upflow or countercurrent flow through fixed beds.
51 citations
TL;DR: In this article, the mass transfer data measured in the liquid fluidized beds of ion exchange resins in the Reynolds number range 0.22-6.4 are presented, and a comparison was made between the experimental results and the values predicted by the recent theory of Nelson and Galloway and by the modified theory proposed by Rowe.
38 citations
TL;DR: In this article, the application of pulse NMR to the study of hydration of cement and its constituents is discussed, where the quantity of adsorbed water in hydrated samples can be most easily determined by measuring the proton free induction decay signal, whereas the rates of hardening and hydration can be best followed by measuring proton spin-lattice and spin-spin relaxation times.
36 citations
TL;DR: A detailed account of present work with single- and multi-channel stimulation of paralysed legs is given, as well as some research data on upper extremity stimulation.
Abstract: Functional electrical stimulation of the extremities (FES) is a new method for the rehabilitation of paralysed paretic patients. Small, electronic stimulators are worn by the patient, who can voluntarily control the electrical currents applied to his paralysed muscle. These currents activate the disabled extremities and make them at least partially functional once more. This paper presents a short history of FES and discusses recent advances and problems in the field. A detailed account of present work with single- and multi-channel stimulation of paralysed legs is given, as well as some research data on upper extremity stimulation.
33 citations
TL;DR: In this paper, the cutting process of aluminium alloy, on a turner's lathe, was characterized by spectral analysis of the sound emitted by the process and the influence of the relevant cutting parameters on the spectral distribution were presented and a qualitative explanation of the corresponding effects was given.
31 citations
TL;DR: Results from 5 years of follow-up observations are summarized with respect to incidence risk factors, finding that survival rates tended to increase, although inconsistently, with increasing socioeconomic status as measured by duration of schooling.
28 citations
25 citations
TL;DR: Arm cyclometry was found to be very suitable for wheelchair users with normal upper limbs and oxygen consumption during exercise was studied and analysed by computer.
Abstract: A report is given on studies to determine the best methodological approach in exercise testing of paraplegics. Arm cyclometry was found to be very suitable for wheelchair users with normal upper limbs. Oxygen consumption during exercise was studied and analysed by computer.
22 citations
TL;DR: In this paper, a novel synthetic approach for 1,2,4-thiadiazolo[2,3-a]pyrimidines, 1, 2,4thiadrithmiamino-5-carbethoxyamino-1,2.4ththiadiadiazole and indazoles is described.
22 citations
TL;DR: A thermodynamic study of the isothermal interaction of beta-lactoglobulin with guanidinium chloride and urea has been performed and the free energy of interaction calculated from previously determined preferential binding of denaturants is calculated.
TL;DR: The existence of 2 ternary compounds, BaTiGe309 and BazTiGeZ08, was confirmed and their X-ray crystallographic data were presented in this article, where a subsolidus phase diagram was presented.
Abstract: Subsolidus phase relations in the system Ba0-Ti02-Ge02 were investigated using conventional solid-state reaction techniques and X-ray powder diffraction. The existence of 2 ternary compounds, BaTiGe309 and BazTiGeZ08, was confirmed and their X-ray crystallographic data are presented. The compound BaTiGe309 has a lower limit of stability at 1135°C and melts incongruently at 1232°C; Ba2TiGe2O2 melts congruently at 1228°C. Subsolidus compatibility relations in the ternary system were established and tie lines between the various phases which constitute a total of 12 compatibility triangles at 1000°C are shown in a subsolidus phase diagram.
TL;DR: In this paper, it was shown that the relative quantity of unsaturated fatty acids as well as the content of linoleic acid determining the quality of oil can be determined in individual sunflower seeds, peanuts, soybeans, and bulk samples of oil rape by Fourier transform 13C NMR.
TL;DR: In innervated muscle both enzymes recovered to the activities seen in denervated control muscle and the possibility of transsynaptic transport of acetylcholinesterase from the nerve terminal to the postsynaptic membrane is discussed.
TL;DR: A feasibility study to show that movement plasticity can be improved using a gradually modulated stimulation sequence and suggests that a more important correction of hemiplegic gait using multichannel continuously modulated sequences can be achieved.
Abstract: The paper presents a feasibility study to show that movement plasticity can be improved using a gradually modulated stimulation sequence. The stimulation amplitude can be adjusted to eight above-threshold levels for 16 equal intervals within the walking cycle. The efficiency of such stimulation was demonstrated on the drop-foot correction with two hemiparetic patients. The pretibial muscle group was stimulated and a significant improvement of the ankle-joint goniograms was shown. This fact suggests that a more important correction of hemiplegic gait using multichannel continuously modulated sequences can be achieved.
TL;DR: In this article, the degenerate deformation vibrational of the PO and as-O bonds in the far infrared spectra of the free oxo-bases is located and the 1050-1150 cm −1 region in triphenylphosphine oxide in reassigned.
TL;DR: The model accounts satisfactorily for the generation time distribution function and for the shortening of the G1 phase of binucleate cells and a possible relationship is proposed between the chemical parameters within the cell and the parameters of the cell population kinetics.
Abstract: The transition probability model of variability of cell generation times is extended so that the rate constant for the transition from the A-state to the B-phase of the cell cycle depends on on time which a particular all has already spent in the A-state. A specific time dependence of this rate constant is introduced. It is determined by the value of one constant which is then an additional parameter of the model. The corresponding cell population kinetics are calculated and compared to existing experimental evidence. The model accounts satisfactorily for the generation time distribution function and for the shortening of the G1 phase of binucleate cells. The time dependence of the transition probability is related to the cell kinetics of an hypothetical cell constituent. A possible relationship is proposed between the chemical parameters with the cell and the parameters of the cell population kinetics.
TL;DR: In this article, the deuteron quadrupole coupling constant e2qQ/h equals 58 ± 10 kHz and the asymmetry parameter is η = 0.4 ± 0.1.
TL;DR: In this article, the osmotic coefficients of polystyrenesulfonic acid (poly[1-(sulfophenyl)ethylene]) and its sodium, thallium, calcium and cadmium salt solutions were measured by a membrane osmometer for counterion molalities MC = 10−2 to 5·10−4mol/kg, at 25°C.
Abstract: Eight sodium salts of polystyrenesulfonic acid (poly[1-(sulfophenyl)ethylene]) of different molecular weights were prepared similarly and purified in the same way. Their aqueous solutions were thus chemically equivalent, and differed only in their molecular weights, which were determined viscosimetrically.
The osmotic coefficients (Φ) of the acid and its sodium, thallium, calcium and cadmium salt solutions were measured by a membrane osmometer for counterion molalities mc = 10−2 to 5·10−4mol/kg, at 25°C. In the same concentration range, the activity coefficients of hydrogen counterions (γH) of acid solutions were calculated from electromotive force measurements and the osmotic coefficients of the acid solutions were determined by the cryoscopic method for two different molecular weights. The values obtained are presented graphically as functions of the measured average molecular weight for mc = 10−3 and 10−2 mol/kg and are in good mutual agreement within experimental error.
This agreement of results could be assumed to verify experimentally that the colligative properties of polystyrene-sulfonate polyelectrolytes at low concentrations are dependent on the molecular weight of the polyion.
The obtained results together with some literature data, allow us to evaluate very approximately the activity coefficients of monovalent counterions (γc) for mc = 10−2 mol/kg as a function of the degree of polymerization (n) of linear oligoions or polyions, for values of n up to 104.
TL;DR: For the reaction CO + 1 2 O 2 → CO 2 over NiO catalyst, 13 C and 14 C kinetic isotope effects were determined in the temperature range from 250 to 500 °C as mentioned in this paper.
TL;DR: In this article, the Meerwein-Wagner rearrangement occurred only in the case of chlorine or fluorine halosubstituents of β-carbonium ions formed by exo attack of the electrophile.
TL;DR: In this article, a review of the recent progress in the use of nqr, nmr and epr for the study of soft modes in order-disorder and displacivc type solid ferroelectrics is given.
Abstract: A review is given of the recent progress in the use of nqr, nmr and epr for the study of soft modes in order-disorder and displacivc type solid ferroelectrics. The study of the soft modes and symmetry recovering Goldstone modes in liquid crystalline ferroelectrics where-in contrast to solid ferroelectrics-a discrete symmetry group is broken at the phase transition temperature is as well reviewed. The evidence for central modes obtained from the dispersion of T 1 between O and 60 K Gauss in KD2FO4 NaH3(SeO3)2 and several liquid crystalline systems is discussed.
TL;DR: In this paper, 2-Azidothiazolo[5,4-b]pyridine and 2-azidothia[4,5-c] pyridine were synthesized and equilibria at different temperatures were determined.
TL;DR: The angular distribution of γ-rays from the radiative capture of fast nucleons has been calculated according to the direct-semidirect capture model and compared with the available experimental data.
TL;DR: The use of benzene, in place of methylene chloride as solvent, allows the synthesis of amides of indole-3-carboxylic acid via the photolysis of 3-diazo-4-oxo-3,4-dihydroquinoline to occur in significantly higher yield and requiring shorter reaction times as mentioned in this paper.
TL;DR: Aza-transfer reactions between heterocyclic hydrazines and diazonium salts have been investigated in this article, where the reaction proceeds via intermediate tetrazenes and labelled compounds have been used to elucidate the reaction mechanism.
TL;DR: The real incident neutron-target nucleus vibration coupling within the direct-semidirect theory of fast nucleon capture does not lead to a satisfactory reproduction of experimental data on fast neutron capture in heavier nuclei as discussed by the authors.
TL;DR: In this article, the authors discussed the nature of broad and strong absorption culminating near 950 m−1 and of the bands in the 1600-1700 cm−1 region with respect to polarized transmission, ATR, and Raman data obtained with single crystals of potassium hydrogen (and deuterium) succinate.
TL;DR: The average thickness of the thyroid epithelial cells may be determined by the direct or caliper method, and the thickness is overestimated as a result of which its empirical value must be divided by a correction factor Kd.
Abstract: SUMMARY
The average thickness of the thyroid epithelial cells may be determined either directly or indirectly. By the direct or caliper method, this thickness is overestimated as a result of which its empirical value must be divided by a correction factor Kd. By the indirect method, on the other hand, the thickness of the thyroid gland epithelium is calculated as the ratio of the double volume density of the epithelium to the sum of the inner and the outer surface density of the epithelium; in this case the sought for thickness value is underestimated and must consequently be multiplied by a factor Ki.
Both correction factors are algebraically defined. Their values are calculated and graphically represented as a function of the thyroid activation index (the ratio between the volume density of the epithelium and the colloid) for the range from 0·1 to 100.
The validity of the theoretical interpretation of the discrepancy between the values obtained for the average thickness of the thyroid epithelium by the direct and the corresponding values obtained by the indirect method, is empirically tested. It is shown that by the introduction of appropriate correction factors the difference between the results obtained by each method can be reduced. These improved direct and indirect methods for determining the wall thickness of a hollow sphere seem to lend themselves to being used in the stereological analysis of other biological, perhaps even non-biological materials of similar structure.
TL;DR: In this paper, a preprocessing method for the use of infrared data files in structural elucidation is discussed and different hierarchical trees, as well as multi-category predictions based on average infrared spectra of the appropriate classes are prepared and inspected for predictive ability.