ALBERT

All Library Books, journals and Electronic Records Telegrafenberg

Your email was sent successfully. Check your inbox.

An error occurred while sending the email. Please try again.

Proceed reservation?

Export
Filter
  • Chromatographie, Dünnschicht  (20)
  • Spektralphotometrie, Atomabsorption  (17)
  • 79.20  (16)
  • liver  (15)
  • Neurosecretion
  • Springer  (73)
  • American Geophysical Union
  • Irkutsk : Ross. Akad. Nauk, Sibirskoe Otd., Inst. Zemnoj Kory
  • Krefeld : Geologischer Dienst Nordhein-Westfalen
  • Wiley
  • 2015-2019
  • 2005-2009
  • 1975-1979  (73)
  • 1970-1974
  • 1977  (73)
Collection
Keywords
Publisher
  • Springer  (73)
  • American Geophysical Union
  • Irkutsk : Ross. Akad. Nauk, Sibirskoe Otd., Inst. Zemnoj Kory
  • Krefeld : Geologischer Dienst Nordhein-Westfalen
  • Wiley
Years
  • 2015-2019
  • 2005-2009
  • 1975-1979  (73)
  • 1970-1974
Year
  • 1
    Electronic Resource
    Electronic Resource
    Springer
    Applied physics 12 (1977), S. 137-148 
    ISSN: 1432-0630
    Keywords: 71.50 ; 72.20 ; 79.20
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract Thermal SiO2-films of MOS-structures have been implanted with Cs-and B-ions so that the distribution maximum was located near the center of the insulating films. The change in conduction mechanism was analysed before and after implantation and annealing at 500°C for 2h. Two major types of effects are observed: 1) Implantation generally changes the conduction mechanism from Fowler-Nordheim tunneling in pure SiO2 to the Frenkel-Poole mechanism in the implanted film for both types of ions. This effect is caused by traps due to radiation damage. 2) The second effect is dependent on the implanted type of ion. A strong increase of the current at high fields is observed after Cs-implantation while B-implantation leads to a decrease of the current at high fields. This effect is caused by field-enhanced emission and trapping of charge carriers, respectively. The local field in the implanted region is dependent on the charge state of the implanted ion. Cesium is positively and Boron is negatively charged in the oxide. After high-field stressing, a forming process occurs in the oxide which leads to high injection from the contacts. This forming process is very little dependent on the implantation.
    Type of Medium: Electronic Resource
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
  • 2
    Electronic Resource
    Electronic Resource
    Springer
    Applied physics 13 (1977), S. 205-207 
    ISSN: 1432-0630
    Keywords: 79.20
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract The dependence of depth resolution on sputter depth due to various parameters is theoretically estimated. Comparison with experimental work of different authors shows the validity of the proposed model.
    Type of Medium: Electronic Resource
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
  • 3
    Electronic Resource
    Electronic Resource
    Springer
    Applied physics 13 (1977), S. 261-266 
    ISSN: 1432-0630
    Keywords: 79.20
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract Ar+ induced Auger electrons from Si and Ar were investigated at bombardment energies between 3–15 keV and target currents of a few μA. The Auger electron yields were compared with secondary ion yields of Si and Ar by simultaneous SIMS-AES measurements. In the ion induced Auger spectra of Si five Auger peaks and in the Ar spectra three Auger peaks were observed. The ion induced Auger electron yield of Si and Ar were found to be strongly dependent upon the primary ion energy. “Bulk like” and “atomic like” Auger transitions of ion induced Auger electrons of Si were observed.
    Type of Medium: Electronic Resource
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
  • 4
    Electronic Resource
    Electronic Resource
    Springer
    Applied physics 13 (1977), S. 391-393 
    ISSN: 1432-0630
    Keywords: 79.20 ; 85.30
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract Rutherford backscattering has been used to measure the lattice positions occupied by Pb following room temperature implantation into silicon. The data provide information on the size and deposition of amorphous zones in relation to the distribution of implanted Pb.
    Type of Medium: Electronic Resource
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
  • 5
    Electronic Resource
    Electronic Resource
    Springer
    Applied physics 13 (1977), S. 47-49 
    ISSN: 1432-0630
    Keywords: 79.20
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract Sputtering or ion impact desorption of adsorbed layers can be directly investigated by low-energy ion scattering. Because of its specific sensitivity to surface atoms, this method provides the possibility of monitoring the decrease of the signal from the adsorbate or the increase of the signal from the substrate. Both signals were studied with He+ backscattering from the system O on Ni (110). The measured desorption cross-sections and the principal implications for both ways of observation are discussed. The use of the substrate signal for the desorption study can be of major advantage, particularly in the case of light adsorbates.
    Type of Medium: Electronic Resource
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
  • 6
    ISSN: 1432-0630
    Keywords: 79.20
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract The application of a retarding-dispersive energy analyzer as the pre-filter of a quadrupole mass analyzer has made it possible to combine a standard high-speed Secondary Ion Mass Spectrometer (SIMS) and a high-resolution secondary-ion energy analyzer into one instrument. Data taken with this instrument indicate the presence of very significant high-energy tails in the energy distribution of all observed secondary ions, even with relatively low (2 keV) primary ion energies. The shape of the energy distribution varies widely from element to element, for atomic compared to molecular species sputtered from a clean metal surface, and depends, for a given species sputtered from a metal surface, on the degree of surface oxidation. The variations established in the present work are large enough to introduce in many cases substantial discrepancies between published values of both relative ion sputtering yields and surface elemental concentrations and values obtained by considering the complete energy distribution. Methods of obtaining accurate secondary ion yields by integrating the energy distribution are discussed.
    Type of Medium: Electronic Resource
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
  • 7
    ISSN: 1432-0630
    Keywords: 82.65 ; 79.20 ; 34
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract Having developed a new method of differential lifetime measurement using atomic ionoluminescence as an excitation process, we applied this method to a monocrystaline silicon sample in an oxygen atmosphere of variable pressure. We found decreased values of the experimental lifetimes concerning levels 4s 3 P 0 and 4s 1 P 0, which are more marked when the oxygen pressure increases. This tends then towards a saturation of the observed phenomenon. We propose, in agreement with other authors, an explanation which is based on the existence of non-radiative deexcitations. We present also a mathematical model for calculating this transition effect on the lifetime measurements. We consider that it is possible to take advantage of this experimental lifetime variation to determine a parameter of the model which characterises the non-radiative deexcitations. This measuring method appears to be a simple and original procedure for the study of certain nonradiative transitions.
    Type of Medium: Electronic Resource
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
  • 8
    Electronic Resource
    Electronic Resource
    Springer
    Applied physics 14 (1977), S. 351-354 
    ISSN: 1432-0630
    Keywords: 68.20 ; 79.20
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract A definition of edge resolution is proposed, which is adapted to the pecularities of scanning Auger microscopy. Based on recent monte-Carlo computer simulations for scanning electron microscopy, the influence of backscattered electrons on the edge resolution is estimated for low-Z (Al) and high-Z materials (Au). The resolution is found to be of the order of 100nm and to be nearly independent of the atomic number of the sample.
    Type of Medium: Electronic Resource
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
  • 9
    Electronic Resource
    Electronic Resource
    Springer
    Applied physics 14 (1977), S. 43-47 
    ISSN: 1432-0630
    Keywords: 79.20 ; 82.65
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract An experimental system for mass spectrometry of supttered neutral particles involving a hf plasma operated in Ar at several 10−4 Torr is described. The potentialities of the method for quantitative surface analysis are reasoned. Depth profiling by sputtered neutral mass spectrometry is demonstrated for anodic oxide layers on Nb and Ta.
    Type of Medium: Electronic Resource
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
  • 10
    Electronic Resource
    Electronic Resource
    Springer
    Applied physics 12 (1977), S. 101-112 
    ISSN: 1432-0630
    Keywords: 79.20 ; 61.80
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract The influence of ion bombardment on the composition of surfaces was investigated by means of ESCA. The bombardment of metal oxides with inert gas ions results, not only in sputtering of the surface, but also in reduction of the oxides. The rate of reduction is particularly high when the oxide/metal interface is within the range of the bombarding ions. Ion induced reduction was found in oxide layers, thinner than the escape depth of the photoelectrons, on Mo, W, Nb, Ta, Ti, Zr, Si, and Bi. The relationship between reduction phenomena, on the one hand, and the ion energy, angle of incidence, mass of the gas used for bombardment, and ion current density, on the other hand, was investigated in the case of the Mo/Mo-oxide system. Ion bombardment of surfaces may also result in the formation of new compounds. Two examples of this are the formation of carbides through the bombardment of contaminated surfaces and the ion induced formation of C-F compounds from a mixture of K2SiF6 and carbon.
    Type of Medium: Electronic Resource
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
  • 11
    Electronic Resource
    Electronic Resource
    Springer
    Applied physics 12 (1977), S. 45-53 
    ISSN: 1432-0630
    Keywords: 06 ; 79.20 ; 73
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract A very sensitive technique is presented which can be applied to determine deep level profiles in space-charge layers of Schottky barriers orpn-junctions. The method uses an extended transient capacitance technique with correlation similar to Lang's DLTS technique. The extension of DLTS to double correlation DDLTS is necessary to resolve the deep level profile and to exclude the field dependence of the capture cross-section and contact effects. By using a double-pulse capacitance transient and correlation, these undesired effects can be subtracted. Profiles can be determined for deep levels at concentrations 104 times lower than the background doping. Results are reported for epitaxial GaAs which showed one major deep level at 0.18 eV below the conduction band. Near the interface to the substrate, a slight shift in energy from 0.18 to 0.19 eV is observed. A second level at 0.43 eV decays into the epi-layer in the form of a diffusion tail.
    Type of Medium: Electronic Resource
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
  • 12
    Electronic Resource
    Electronic Resource
    Springer
    Applied physics 14 (1977), S. 189-191 
    ISSN: 1432-0630
    Keywords: 79.20
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract Reflection high energy electron diffraction has been used to investigate the amorphous to polycrystalline structure transition in silicon induced by laser pulse. The power density of the ruby laser pulse, in the free generation mode, has been maintained below the threshold to induce surface damage. Depth analysis has been carried out in 〈100〉 silicon crystal using the channeling effect technique.
    Type of Medium: Electronic Resource
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
  • 13
    Electronic Resource
    Electronic Resource
    Springer
    Applied physics 14 (1977), S. 283-287 
    ISSN: 1432-0630
    Keywords: 79.20
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract TheL 2,3 VV Auger transitions of Si, SiO2, and SiC have been measured and compared with the self-fold electron density of states. The data indicate that Auger matrix effects must be included to explain the structure of the Auger lines. A comparison with soft X-ray measurements of Wiech shows, that the measured Auger line shape is nearly identical with the self-foldK β emission band. The selection rules for X-ray emission lead then to the conclusion that mostlyp-like valence electrons are involved in the Auger transition. This result indicates the relative importance ofs andp states in Auger transitions which is in accordance with theoretical calculations of Feibelman et al.
    Type of Medium: Electronic Resource
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
  • 14
    Electronic Resource
    Electronic Resource
    Springer
    Applied physics 12 (1977), S. 311-315 
    ISSN: 1432-0630
    Keywords: 79.20
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract The reaction of a clean Ti (0001) surface with oxygen gas at low pressure and room temperature has been studied with low-energy electron diffraction (LEED) and Auger electron spectroscopy (AES). At low exposures (about 1 Langmuir) ap(2×2) superstructure is observed which gradually converts to 1×1 at high exposures (about 100 Langmuirs). The LEED spectra confirm that the final 1×1 structure is different from that of clean Ti (0001), while the AES spectra indicate that the final oxide is probably TiO, not TiO2. The plausibility of this indication is discussed.
    Type of Medium: Electronic Resource
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
  • 15
    Electronic Resource
    Electronic Resource
    Springer
    Applied physics 13 (1977), S. 43-46 
    ISSN: 1432-0630
    Keywords: 79.20 ; 82.65
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract Auger electron spectra of the transition metals Cr, Mn, Fe, Co and Ni as well as their oxides have been investigated in the energy range between 0–100 eV. In each case of the clean metal surface the observed spectrum consists essentially of one Auger line identified asM 2,3 VV transition. After oxidation a line doublet is observed revealing two transitions instead of one. Additional new Auger peaks appear in the low energy range between 0–30 eV. The “splitting” of the Auger line can be explained as resulting from aM 2,3 V dVd and aM 2,3 V pVp transition. The latter is characteristic for the compound and can in a simple way be interpreted as a cross transition.
    Type of Medium: Electronic Resource
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
  • 16
    Electronic Resource
    Electronic Resource
    Springer
    Applied physics 12 (1977), S. 149-156 
    ISSN: 1432-0630
    Keywords: 79.20
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract Implications in the use of the electronic gating scheme in depth profiling studies of layer structures by means of raster scanning secondary ion mass spectrometry are investigated. The profile of the sputtering crater and the intensity variation after break-through are calculated with the scan width and the gate width as parameters. Thick (5.6 μm) magnetic garnet layers grown an a non-magnetic garnet substrate were used for depth profiling measurements. A relative depth resolution of 1% could be obtained. Comparison of experimental results with calculated data shows excellent agreement.
    Type of Medium: Electronic Resource
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
  • 17
    ISSN: 1573-4927
    Keywords: aryl hydrocarbon hydroxylase, gene loci controlling ; cigarette smoke ; mice ; lung ; liver ; 3-methylcholanthrene
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology
    Notes: Abstract When mice from different inbred strains are injected intraperitoneally with 3-methylcholanthrene (MC), the activity of aryl hydrocarbon hydroxylase (AHH) rapidly increases in livers of some strains but not others. AHH plays a role in the metabolism of polycyclic hydrocarbons. Alleles at a small number of loci account for most of the variation in inducibility of hepatic AHH among mice, when MC is used as the inducing agent. Cigarette smoke is a common source of carcinogenic polycyclic hydrocarbons in the environment. Since some of the hydrocarbons in cigarette smoke are metabolized by AHH, the activity of AHH in tissues may affect the carcinogenicity of smoke in those tissues. The purpose of these experiments was to see whether induction of AHH in lung in response to cigarette smoke is regulated by the same genes that regulate induction of AHH in liver in response to MC. Mouse strains AKR/J and C57L/J and six recombinant inbred (RI) lines derived from them were tested for the response of AHH in lung and liver to parenteral MC or inhalation of cigarette smoke. Inducibility (the ratio of MC-induced AHH activities to basal AHH activities) in liver from MC-treated RI lines is bimodal and compatible with Mendelian segregation of genes at a small number of loci. Increased activities of AHH in MC-treated liver are associated with increased ability to metabolize BP and whole smoke condensates to mutagens detected by Salmonella typhimurium TA1538. Inducibility of AHH in lung in response to MC is not bimodal, and no definite conclusion about the number of loci can be made. When actual levels of AHH activity are considered, following the administration of MC as inducing agent, there is a correlation (r=0.89, p〈0.01) between AHH levels in liver and lung, suggesting that some genes affecting liver also affect lung. Basal and MC-induced AHH levels in lung are also correlated (r=0.86, p〈0.01). Mice with high basal activities have two to threefold higher levels of AHH after MC treatment than do mice with low basal activities. Induction of AHH in pulmonary tissues occurs in all mice after either parenteral MC or smoke inhalation. In contrast to MC treatment, AHH activities in lungs following smoke inhalation are not correlated with AHH levels in liver after MC (r=0.49) and are only weakly correlated with basal (r=0.66, 0.05〈p〈0.10) pulmonary levels. The correlation between MC-induced and smoke-induced AHH activities in lung is weak (r=0.63, 0.05〈p〈0.10). We conclude that the genetic regulation of AHH activity in lung is not as simple as the genetic regulation of AHH activity in liver, especially when complex inducing agents such as cigarette smoke are used.
    Type of Medium: Electronic Resource
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
  • 18
    Electronic Resource
    Electronic Resource
    Springer
    Cell & tissue research 182 (1977), S. 557-564 
    ISSN: 1432-0878
    Keywords: Sinus gland ; Gammarus ; Neurosecretion ; Ultrastructure
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary The sinus gland of Gammarus oceanicus, like that of other crustaceans, is composed of three elements: neurosecretory axons, glial cells and stromal sheath. Five neurosecretory axon types are identified on the basis of granule diameter, shape, and electron density, and axon matrix density. Exocytosis appears to be the major release mechanism of neurosecretory material. The preterminal regions of neurosecretory axons contain axoplasmic reticulum and neurotubules. Their arrangement in the axon and relationship with one another suggest a transport function. Multilamellar bodies are found in the terminal regions of neurosecretory axons. They arise from mitochondria and may be involved in granulolysis.
    Type of Medium: Electronic Resource
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
  • 19
    ISSN: 1432-0878
    Keywords: Neurosecretion ; Alcian blue ; Alcian yellow staining ; Ultrastructure ; Bulinus truncatus
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary The neurosecretory system of the freshwater snail Bulinus truncatus was investigated. With the Alcian blue-Alcian yellow (AB/AY) staining method at least 10 different types of neurosecretory cells (NSC) were distinguished in the ganglia of the central nervous system. The differences in staining properties of the NSC — with AB/AY the cells take on different shades of green and yellow — are borne out at the ultrastructural level: the NSC types contain different types of neurosecretory elementary granules. The neurosecretory system of B. truncatus is compared to that of Lymnaea stagnalis, the species which has received the most attention among the pulmonates. It appears from the comparison that the systems of both species show many similarities, although some differences are also apparent.
    Type of Medium: Electronic Resource
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
  • 20
    Electronic Resource
    Electronic Resource
    Springer
    Cell & tissue research 176 (1977), S. 109-120 
    ISSN: 1432-0878
    Keywords: Achatina fulica ; Aplysia californica ; Neurosecretion ; Homology
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary The right parietal ganglion of the African snail Achatina fulica contains an identifiable cluster of 20–40 white cells with somatic diameters of 80–110 μ. Cobalt chloride injection into these cells revealed an axon projection in the right parietal nerve as well as apparent terminations in the capsule. The cells contain an abundance of electron dense granules 1000–2000 Å in diameter which are formed in the Golgi apparatus. The granules stain with Gomori's chrome hematoxylin and paraldehyde fuchsin methods. While most cluster cells showed no “spontaneous” electrical activity, there was a correlation for the active cells between rate of activity and intensity of cell whiteness. These and other data suggest that the cluster cells are neurosecretory. A claim of homology with the “rostral white cells”, R3–R13, in the parieto-visceral ganglion of Aplysia is based on a similarity of morphological and electrophysiological features, together with analogous locations in the respective ganglia. It is concluded that the right parietal ganglion of Achatina is homologous with the right half of the parieto-visceral ganglion of Aplysia.
    Type of Medium: Electronic Resource
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
  • 21
    Electronic Resource
    Electronic Resource
    Springer
    Bulletin of experimental biology and medicine 84 (1977), S. 1331-1334 
    ISSN: 1573-8221
    Keywords: benzo(a)pyrene ; liver ; hepatoma ; tissue culture
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Abstract Cells of a monolayer culture of embryonic mouse liver, like cells of a culture of highly malignant hepatoma 22A, maintained by transplantation for 20 years, actively metabolized the carcinogenic hydrocarbon benzo(a)pyrene and are highly sensitive to its toxic action. Considering that liver tissue in vivo is resistant to carcinogenic hydrocarbons, the authors suggest that this resistance is due to factors acting at the organ or organism level but not at the cell level. The problem of the mechanism of preservation of the sensitivity of hepatoma 22A to the toxic action of benzo(a)pyrene also is discussed.
    Type of Medium: Electronic Resource
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
  • 22
    Electronic Resource
    Electronic Resource
    Springer
    Bulletin of experimental biology and medicine 84 (1977), S. 1413-1415 
    ISSN: 1573-8221
    Keywords: carbon tetrachloride ; oxygen ; liver ; bile acids
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Abstract The effect of enteral oxygen therapy was studied in rats with acute degeneration of the liver caused by CCl4. Intragastric injection of oxygen foam reduced the severity of poisoning and led to more rapid and complete recovery of the intensity of bile secretion, synthesis of primary bile acids, and their conjugation with amino acids, and improved the stabilizing properties of the bile.
    Type of Medium: Electronic Resource
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
  • 23
    Electronic Resource
    Electronic Resource
    Springer
    Bulletin of experimental biology and medicine 84 (1977), S. 1783-1784 
    ISSN: 1573-8221
    Keywords: mitochondria ; liver ; alcohol
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Abstract Ultrastructural changes in the hepatocytes under the influence of alcohol were studied. The greatest changes were found in the mitochondria. Physical exertion and a low protein diet have a marked effect on the degree of alcohol poisoning. The first factor reduces whereas the second aggravates the harmful action of alcohol.
    Type of Medium: Electronic Resource
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
  • 24
    Electronic Resource
    Electronic Resource
    Springer
    Bulletin of experimental biology and medicine 83 (1977), S. 487-490 
    ISSN: 1573-8221
    Keywords: mitochondrion ; liver ; vagotomy
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Abstract Changes in the liver mitochondria of rats after bilateral subdiaphragmatic vagotomy were studied. Two stages were distinguished in the dynamics of the response of the mitochondrial system to denervation. During the first stage (0.5–3 days after vagotomy) reversible functional disturbances due to postoperative stress took place in the mitochondria. The second stage (7–60 days after denervation) is characterized by more marked structural and functional changes with some common features with those observed in hypoxia and resulting from vagotomy itself.
    Type of Medium: Electronic Resource
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
  • 25
    Electronic Resource
    Electronic Resource
    Springer
    Bulletin of experimental biology and medicine 84 (1977), S. 1183-1186 
    ISSN: 1573-8221
    Keywords: liver ; polyploidy ; mitotic index ; index of labeled nuclei ; guinea pig
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Abstract An autoradiographic study with [3H]thymidine showed that the hepatocytes of young sexually mature guinea pigs commence the phase of DNA synthesis 25 h after partial hepatectomy. Peaks of the number of labeled nuclei were found 30, 45, and 60 h after the operation. Two waves of mitoses were found by counting mitotic figures in squash preparations: 40 and 55 h after hepatectomy. A cytophotometric study of the DNA content showed that practically all the mononuclear and binuclear hepatocytes contained diploid nuclei 3 and 5 days after the operation. By the end of the 7th day of regeneration there were 6% of mononuclear tetraploid cells. The number of binuclear cells fell during the period of regeneration studied from 16 to 8%. It is concluded that the principal cytological mechanism of liver regeneration in guinea pigs is normal mitosis terminating in separation of the cells.
    Type of Medium: Electronic Resource
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
  • 26
    Electronic Resource
    Electronic Resource
    Springer
    Bulletin of experimental biology and medicine 83 (1977), S. 490-494 
    ISSN: 1573-8221
    Keywords: carbon tetrachloride ; liver ; RNA metabolism
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Abstract Changes in the content and incorporation of 5-3H-uridine after brief exposure to its labeled precursor were studied in the individual liver RNA fractions of rats during administration of carbon tetrachloride for 24 weeks. These fractions were obtained by preparative electrophoresis in 2.5% polyacrylamide gel from previously isolated nuclear and cytoplasmic RNA. Administration of CCl4 to rats was shown to reduce the quantity of transfer and ribosomal RNA in the liver tissue. Chronic CCl4 poisoning also disturbs the synchronization of the turnover of the individual components of fast-labeled RNA.
    Type of Medium: Electronic Resource
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
  • 27
    Electronic Resource
    Electronic Resource
    Springer
    Cell & tissue research 180 (1977), S. 253-261 
    ISSN: 1432-0878
    Keywords: Microtubules ; Neurohypophysis ; Neurosecretion ; Axoplasmic transport
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary The microtubules in the neurosecretory neurones of the posterior pituitary were studied using different electron microscopical techniques. Tannic acid staining indicated that the microtubules had a 13 protofilament substructure similar to that described for microtubules from other tissues and organisms; the dimensions of the microtubules were also similar to that previously reported. Albumen pretreatment clearly showed the microtubules running across axonal swellings, but not continuing across the nerve endings. The only organelles showing possible association with the microtubules were small vesicles and smooth endoplasmic reticulum, no association between hormone granules and microtubules could be seen.
    Type of Medium: Electronic Resource
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
  • 28
    Electronic Resource
    Electronic Resource
    Springer
    Cell & tissue research 178 (1977), S. 129-141 
    ISSN: 1432-0878
    Keywords: Choroid plexus ; Vasopressin ; Neurosecretion ; Rat ; Electron microscopy
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary Light and electron microscopic examination of choroid plexuses from lateral ventricles of water-deprived and subcutaneously or intravenously vasopressin administered rats reveal morphologic changes typical for vasopressin responsive fluid transporting epithelia during hormonal stimulation. Ultrastructural changes noted in both dehydrated and vasopressin treated animals included: the frequent occurrence of choroidal “dark” cells, dilatation of the lateral and basal intercellular spaces, increased vacuolization of the apical cytoplasm, and a change in microvillar conformation from the normal clavate type to those with a filiform shape. On the basis of the ultrastructural changes observed it is proposed that the choroid plexus be regarded as a target tissue for vasopressin. These findings indicated that a vasopressinmediated transchoroidal cerebrospinal fluid absorption capability exists.
    Type of Medium: Electronic Resource
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
  • 29
    Electronic Resource
    Electronic Resource
    Springer
    Bulletin of experimental biology and medicine 83 (1977), S. 143-145 
    ISSN: 1573-8221
    Keywords: liver ; cholesterol biosynthesis ; age
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Abstract After intraperitoneal injection of radioactive sodium acetate into rats of two age groups (6–8 and 28–32 months) the dynamics of cholesterol biosynthesis in the liver was observed to be slower in the older animals. The specific liver cholesterol activity of the older rats was lower at the maximum of uptake of the label than in the younger rats. An atherogenic diet for 20 days (0.25 g cholesterol/100 g body weight) led to an increase in the total cholesterol content but to inhibition of its biosynthesis in the liver, and this effect was most marked in the younger rats. Continued administration of cholesterol depressed its biosynthesis still more, especially in the older animals.
    Type of Medium: Electronic Resource
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
  • 30
    Electronic Resource
    Electronic Resource
    Springer
    Bulletin of experimental biology and medicine 83 (1977), S. 647-650 
    ISSN: 1573-8221
    Keywords: estrogens ; estradiol-binding proteins ; liver ; sex steroids
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Abstract The marked sex differences in the ratio between the hormonal capacity of estradiol-binding components with Stokes' radii (a) of 7.0 and 2.5 nm observed in sexually mature animals are somewhat reduced but do not disappear completely after gonadectomy. Prolonged administration of estradiol (50 μg, 8days) to gonadectomized rats leads to depression of the estradiol-binding activity of all components of liver cytosol of females and males. Injection of testosterone propionate (2 mg, 8 days) into gonadectomized animals leads to selective stimulation of a special estrogen-binding protein with a=2.5 nm, normally characteristic of males alone, in both males and females. It is postulated that sex differences in the system of estradiol-binding proteins of the rat liver cytosol are due to sexual differentiation of the system in the early stages of development, on the one hand, and to the active regulatory influence of androgens and estrogens in the late stages of development, on the other hand.
    Type of Medium: Electronic Resource
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
  • 31
    Electronic Resource
    Electronic Resource
    Springer
    Bulletin of experimental biology and medicine 84 (1977), S. 925-928 
    ISSN: 1573-8221
    Keywords: magnesium ; reflex ; liver ; receptors ; kidney
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Abstract Local stimulation of the liver by MgCl2 solution in unanesthetized dogs caused reflex excretion of magnesium through a change in tubular processes. The presence of receptors selectively sensitive to Mg in the liver is postulated. Information from these receptors was shown to spread among the vagus nerves.
    Type of Medium: Electronic Resource
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
  • 32
    Electronic Resource
    Electronic Resource
    Springer
    Bulletin of experimental biology and medicine 84 (1977), S. 1249-1251 
    ISSN: 1573-8221
    Keywords: antithrombins ; reticuloendothelial system ; liver ; spleen
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Abstract After destruction or removal of part of the liver in rats the levels of antithrombins II, III, and IV fell proportionally to the extent of the interference. Destruction of the spleen led to depression, but splenectomy led to activation of antithrombin IV. Blockade of the reticuloendothelial system caused a smaller decrease in the antithrombin level than partial hepatectomy. It is suggested that the spleen produces an inhibitor of antithrombin IV.
    Type of Medium: Electronic Resource
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
  • 33
    ISSN: 1573-8221
    Keywords: liver ; regeneration ; immune system ; splenic colonies
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Abstract During reparative regeneration in the liver functional activity of the immune system is increased. Resection of the liver is accompanied by sharp changes in the structure of the thymus and spleen. The thymus-dependent parts of the spleen are particularly reactive. Resection of the liver in rats is accompanied by an increase in the number of stem cells in the bone marrow, as determined by the splenic colonies method. The number of colony-forming cells in the spleen of recipients of lymphocytes taken from the hepatectomized animals is significantly greater than in the spleen of recipients of lymphocytes from intact rats. If the limb is screened, ability to form endogenous colonies also is increased in partially hepatectomized rats compared with intact animals. Resection of the liver in rabbits is accompanied by a significant increase in immunological reactivity on the first to third days after the operation. The reactions of leukergia and leukocytolysis are sharply intensified during this period.
    Type of Medium: Electronic Resource
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
  • 34
    ISSN: 1573-8221
    Keywords: thyroid hormones ; liver ; hormone receptors ; mechanism of action of hormones
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Abstract The role of specific iodothyronine-binding proteins of hepatocytes in the nucleo-cytoplasmic relations of thyroid hormones in rats was investigated under normal conditions, after thyroidectomy, and in experimental thyrotoxicosis. The concentration of hormone-binding sites in the cell was shown to depend on the extracellular level of thyroid hormones. The important role of cytosol hormone-binding proteins in the accumulation and intracellular distribution of thyroid hormones is emphasized. Cytosol tri-iodothyronine-binding proteins were shown to play no part in penetration of the hormone into the nucleus. The tri-iodothyronine level in the nuclei was directly dependent on the concentration of receptor proteins in them and the degree of occupancy of the acceptor sites in the receptors themselves.
    Type of Medium: Electronic Resource
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
  • 35
    ISSN: 1573-8221
    Keywords: carbonic anhydrase activity ; dichloroethane ; liver ; myocardium
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Abstract Histochemical changes in the distribution of carbonic anhydrase activity in the myocardium and liver of rats were studied after acute oral poisoning with dichloroethane. Kurate's method in Hausler's modification was used. For a semiquantitative assessment of the changes in enzyme activity a histophotometric method was used. A definite increase in carbonic anhydrase activity in the myocardium and liver was observed in most of the experimental animals and the index of correlation between these changes remained the same as in the intact rats.
    Type of Medium: Electronic Resource
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
  • 36
    Electronic Resource
    Electronic Resource
    Springer
    Bulletin of experimental biology and medicine 83 (1977), S. 146-148 
    ISSN: 1573-8221
    Keywords: glucocorticoids ; α-fetoprotein ; liver ; carbon tetrachloride
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Abstract Experiments on male C57BL mice showed that inhalation of CCl4 for 15 min in a concentration of 0.05 ml/4 liters air causes severe degenerative changes in the liver with features of necrobiosis. However, phenomena of regeneration and cell infiltration arise as early as after 24 h and are accompanied by the secretion of α-fetoprotein into the blood stream. After 4 days the foci of necrobiosis disappear and are totally replaced by lymphocytes with large hepatocytes at the periphery. Processes of regeneration in animals receiving hydrocortisone (20 mg/kg) or dexamethasone (2 mg/kg) therapeutically or prophylactically were less marked and the number of animals producing α-fetoprotein was reduced from 92 to 60–65%.
    Type of Medium: Electronic Resource
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
  • 37
    ISSN: 1618-2650
    Keywords: Spektralphotometrie, Atomabsorption ; Methanpyrolyse zur Behandlung des Graphitrohr-Atomisators
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
  • 38
    Electronic Resource
    Electronic Resource
    Springer
    Fresenius' Zeitschrift für analytische Chemie 283 (1977), S. 9-14 
    ISSN: 1618-2650
    Keywords: Spektralphotometrie, Atomabsorption ; flammenlos, Störungen
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Summary In the first part different methods for studying interferences of the time dependent signal in flameless AAS are presented with emphasis on factorial designs in experimentation as opposed to the one-factor-at-a-time approach. An example of the statistical computations necessary for interpretation of a multifactor experiment is worked out and discussed in detail with special consideration of the explanation of first-order interactions. The influence of instrumentation upon determinations in the graphite furnace is dealt with in the second part: The temperature in the graphite furnace was measured with a pyrometer, a thermocouple and a Hg-thermometer. The results obtained with the pyrometer were in good agreement with the values given by the manufacturer. The stability of the AAS system was checked and found to be sufficient for the investigation of interferences.
    Notes: Zusammenfassung Im ersten Abschnitt werden die verschiedenen Möglichkeiten zur Untersuchung von Störungen des zeitabhängigen Signals bei der flammenlosen AAS aufgezeigt, wobei besondere Bedeutung den faktoriellen Versuchsplänen im Gegensatz zu einparametrigen Untersuchungen beigemessen wird. Ein Beispiel der statistischen Auswertung zur Interpretation eines Experiments mit mehreren Faktoren wird gebracht, und dabei besonderes Gewicht auf die Erklärung von Wechselwirkungen zwischen zwei Faktoren gelegt. Im zweiten Abschnitt werden die apparativen Einflüsse auf Messungen in der Graphitrohrküvette behandelt. Dazu wurde die Temperatur im Graphitrohr mit einem Pyrometer, einem Thermoelement und einem Quecksilberthermometer gemessen. Die Temperaturen, die mit der pyrometrischen Methode gefunden wurden, stimmen gut mit den vom Hersteller angegebenen Werten überein. Die Stabilität des AAS-Gerätes wurde überprüft: sie reicht für die Durchführung von Interferenzstudien aus.
    Type of Medium: Electronic Resource
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
  • 39
    Electronic Resource
    Electronic Resource
    Springer
    Fresenius' Zeitschrift für analytische Chemie 283 (1977), S. 32-32 
    ISSN: 1618-2650
    Keywords: Nachw. von LSD, Ergot-Alkaloiden ; Chromatographie, Dünnschicht
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
  • 40
    Electronic Resource
    Electronic Resource
    Springer
    Fresenius' Zeitschrift für analytische Chemie 283 (1977), S. 97-103 
    ISSN: 1618-2650
    Keywords: Best. von Cadmium ; Spektralphotometrie, Atomabsorption ; flammenlos, Störungen
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Summary Interferences in the flameless determination of cadmium using the HGA 72 were studied for HCl, HNO3, H2SO4, HClO4 and HF and found to be depending on different thermal pretreatment. The interferences of cations were much smaller than for anions. The results are discussed with respect to thermal stability as well as atomization rate of the compositions under investigation. Special emphasis is put upon the presence of interactions between interferents, which in some cases can be used to eliminate interferences.
    Notes: Zusammenfassung Interferenzen, die bei der flammenlosen Bestimmung von Cadmium in der HGA 72 auftreten, wurden bei HCl, HNO3, H2SO4, H3PO4, HClO4 und HF studiert; die AbhÄngigkeit ihres Auftretens von der thermischen Vorbehandlung wird gezeigt. Interferenzen von Kationen sind kleiner. Die Ergebnisse werden im Hinblick auf die thermische StabilitÄt und die Atomisierungsgeschwindigkeit der Proben diskutiert. Besonders betont wird die Gegenwart von Wechselwirkungen zwischen Störungen, die manchmal auch benützt werden können, um Interferenzen auszuschalten.
    Type of Medium: Electronic Resource
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
  • 41
    Electronic Resource
    Electronic Resource
    Springer
    Fresenius' Zeitschrift für analytische Chemie 283 (1977), S. 183-190 
    ISSN: 1618-2650
    Keywords: Best. von Blei ; Spektralphotometrie, Atomabsorption ; flammenlos, Störungen
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Summary Interferences in the flameless determination of lead using the HGA 72 were studied for HCl, HNO3, H2SO4, H3PO4, HClO4, HF and for a number of cations. In certain instances interferents in just 1000-fold concentration over lead are shown to cause deviations in the lead signal. Many of the interferences are matrix-dependent themselves and can be reduced by matrix variations. Optimization of the thermal pretreatment can be used effectively to reduce random error and/or systematic errors. The thermal stability of lead compounds in the graphite furnace was sufficient for charring procedures up to 900° C for 20 s.
    Notes: Zusammenfassung Interferenzen, die bei der flammenlosen Bestimmung von Blei in der HGA 72 auftreten, wurden bei HCl, HNO3, H2SO4, H3PO4, HClO4, HF und einigen Kationen studiert. In gewissen Fällen reicht ein nur 1000 facher Überschuß des Störions, um Abweichungen vom Signal des Bleistandards hervorzurufen. Da das Auftreten von Interferenzen auch oft matrixabhängig ist, können Matrixvariationen zur Unterdrückung von Interferenzen eingesetzt werden. Die Optimierung des Temperaturprogrammes wird erfolgreich zur Beeinflussung des Zufallsfehlers und/ oder systematischer Fehler herangezogen. In der Graphitrohrküvette reichte die Stabilität der Bleiverbindung aus, um beim Veraschungsschritt die Temperatur bis auf 900° C (20 s) zu steigern.
    Type of Medium: Electronic Resource
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
  • 42
    Electronic Resource
    Electronic Resource
    Springer
    Fresenius' Zeitschrift für analytische Chemie 283 (1977), S. 337-341 
    ISSN: 1618-2650
    Keywords: Best. von Quecksilber in Luft, Gasen ; Spektralphotometrie, Atomabsorption ; flammenlos
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Summary Mercury is adsorbed on cellulose powder and activated charcoal. The contents of the adsorber are burnt in the oxy-hydrogen flame, and the mercury determined by the flameless atomic absorption procedure. The method is applicable to mercury present as metallic vapour, organo mercurical compounds and particulate matter containing adsorbed mercury compounds. The combustion step eliminates all possible non-atomic absorption interferences in the measuring procedure and ensures quantitative recovery of the mercury from the adsorption material. Quantitative adsorption recovery over a wide range of flow rate from 2–200 l/h allows the use of small battery operated pumps for personal monitoring, or vacuum pumps for high speed and large volume sampling. The range of flow rate makes isokinetic sampling conditions possible.
    Notes: Zusammenfassung Quecksilber wird an Cellulosepulver und Aktivkohle adsorbiert. Der Inhalt des Adsorbers wird in der Wasserstoff-Sauerstoff-Flamme verbrannt und das Quecksilber durch flammenlose Atomabsorption bestimmt. Die Methode erfa\t Quecksilber als Metalldampf, in Form von Organo-Quecksilberverbindungen sowie Quecksilberverbindungen, die an Staubpartikel adsorbiert sind. Die Verbrennung in der Wasserstoff-Sauerstoff-Flamme eliminiert Störungen durch nicht-atomare Absorption bei der AAS-Messung und garantiert die quantitative Erfassung des adsorbierten Quecksilbers. Die quantitative Adsorption über einen gro\en Bereich der Durchflu\geschwindigkeit von 2–200 l/h erlaubt batteriebetriebene Pumpen für die Quecksilbermessung „am Mann“, oder den Einsatz von Vakuumpumpen für die Probenahme bei hoher Durchflu\rate und gro\em Probenvolumen. Der gro\e Bereich der Durchflu\rate gestattet isokinetische Bedingungen für die Probenahme.
    Type of Medium: Electronic Resource
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
  • 43
    Electronic Resource
    Electronic Resource
    Springer
    Fresenius' Zeitschrift für analytische Chemie 284 (1977), S. 47-48 
    ISSN: 1618-2650
    Keywords: Analyse von Ergotalkaloiden ; Chromatographie, Dünnschicht
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
  • 44
    Electronic Resource
    Electronic Resource
    Springer
    Fresenius' Zeitschrift für analytische Chemie 285 (1977), S. 48-48 
    ISSN: 1618-2650
    Keywords: Nachw., Best. von Dichlorvos in Biolog. Material ; Chromatographie, Dünnschicht
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
  • 45
    Electronic Resource
    Electronic Resource
    Springer
    Fresenius' Zeitschrift für analytische Chemie 285 (1977), S. 255-255 
    ISSN: 1618-2650
    Keywords: Trenn. von Thiazolylbenzothiazolen ; Chromatographie, Dünnschicht ; isomere
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
  • 46
    Electronic Resource
    Electronic Resource
    Springer
    Fresenius' Zeitschrift für analytische Chemie 286 (1977), S. 50-53 
    ISSN: 1618-2650
    Keywords: Trenn, von Seltenen Erden ; Chromatographie, Dünnschicht ; Verteilungsverfahren ; Tetrahydrofuran, Triphenylphosphinoxid, Paraldehyd, Di-iso-propyläther-Tetrahydrofuran
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Zusammenfassung Die Verteilungskonstanten von Selten-Erd-Nitraten im System Tributylphosphat-wäßrige Nitrat-Lösung werden berechnet. Dünnschicht-chromatographisch können mit Tributylphosphat in Isooctan als Laufmittel die Selten-Erd-Nitrate von La bis Gd vom Gd bis Lu getrennt werden. Eine Trennung von 13 Seltenen Erden auf einem Chromatogramm gelingt mit den Laufmitteln a) Tetrahydrofuran/Paraldehyd/Salpetersäure (20∶70∶10), b) dem Laufmittel Triphenylphosphinoxid (0,3 M in Paraldehyd) und konz. Salpetersäure im Verhältnis 90∶10, c) Di-iso-propyläther/Tetrahydrofuran/Salpetersäure (100 ∶ 60 ∶ 10). Der Trennmechanismus wird diskutiert.
    Notes: Abstract The distribution constants of the rare earth nitrates in the system tri-n-butylphosphate/aqueous nitrate solution are calculated. With thin-layer chromatography it is possible to separate the rare earth nitrates from La to Gd and from Gd to Lu in the solvent system tri-n-butylphosphate in i-octane. A separation of 13 rare earths in only one chromatogram is possible in the solvent systems a) tetrahydrofuran/paraldehyde/nitric acid (20∶70∶10), b) tri-phenylphosphinoxide (0.3 M in paraldehyde)/conc. nitric acid in the ratio 90∶10, c) di-iso-propylether/tetrahydrofuran/nitric acid (100∶60∶10). The mechanism of the separation is discussed.
    Type of Medium: Electronic Resource
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
  • 47
    ISSN: 1618-2650
    Keywords: Best. von Kupfer in Legierungen, Stahl ; Spektralphotometrie, Atomabsorption ; Graphitrohrküvette, Spuren
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Zusammenfassung Die Bestimmung kleiner und kleinster Kupfergehalte in Stahl und anderen Metallegierungen durch Atomabsorptions-Spektralphotometrie wurde untersucht. Dabei konnte festgestellt werden, daß die bei Untersuchungen an wäßrigen Lösungen mit der Flamme auftretenden merklichen Interferenzen durch Begleitelemente völlig ausgeschaltet werden können, wenn das Kupfer mit Pb-DDTC in Chloroform extrahiert und der Extrakt mit der Graphitrohrküvette untersucht wird. Ferner wurde festgestellt, daß die Graphitrohrküvette der Flamme bei den Arbeiten mit organischen Lösungsmitteln erheblich überlegen ist, da von der Art der Lösungsmittel keine Einschränkung des Einsatzbereiches erfolgt. — Die Methoden der kontinuierlichen Veränderungen nach Job und des molaren Verhältnisses nach Yoe u. Jones zur Bestimmung der Komplexzusammensetzung konnten für das System Cu-DDTC auf das Arbeiten mit der Graphitrohrküvette übertragen werden.
    Notes: Abstract The determination of small and smallest amounts of copper in steel and other metal alloys by atomic absorption spectroscopy was investigated. It has been found, that the interferences caused by accompanying elements in the determination in aqueous solution with the flame can be completely removed by extracting the copper with Pb-DDTC in chloroform and determining this extract with the heated graphite atomizer. Moreover, it was recognised, that working with the heated graphite atomizer in organic solutions shows great advantages compared with the flame, because any solvent may be used. The methods of continuous variation by Job and the molar ratio by Yoe and Jones for the determination of the complex stoichiometry were transferred to the system Cu-DDTC by working with the heated graphite atomizer.
    Type of Medium: Electronic Resource
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
  • 48
    Electronic Resource
    Electronic Resource
    Springer
    Fresenius' Zeitschrift für analytische Chemie 283 (1977), S. 15-21 
    ISSN: 1618-2650
    Keywords: Spurenanalyse ; Silberhalogenide als Spurenfänger für Chelatkomplexe ; Analyse von Mangan, Manganverbindungen ; Spektralphotometrie, Atomabsorption ; Komplexierung von Spuren mit Phenanthrolin, AgJ als Spurenfänger
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Zusammenfassung Das Nachweisvermögen der Flammen-AAS für Elementspuren wird in Gegenwart der Matrix Mangan erheblich herabgesetzt, so daß eine Abtrennung der Spuren bei der Reinheitskontrolle von Mangan und Manganverbindungen erforderlich ist. Dazu werden die Spuren mit 1,10-Phenanthrolin komplexiert und mit Silberjodid als Spurenfänger angereichert. Durch Erhitzen des abfiltrierten Silberjodids mit HNO3 gelangt man zu nahezu matrixfreien Spurenlösungen von 10 ml, in denen 9 Elemente (Fe, Co, Ni, Cu, Zn, Cd, Pb, Bi und Tl) durch Flammen-AAS bestimmt wurden. Bei Einwaagen von 5–10 g Mangan bzw. Manganverbindungen unterschiedlicher Oxidationsstufen werden — je nach Element — Nachweisgrenzen zwischen 0,01 und 1 ppm erreicht. Durch Aufkonzentrieren der Spurenlösung auf 1 ml und anschließende Bestimmung mit der „Injektionsmethode“ der Flammen-AAS gelangt man zu Nachweisgrenzen von 0,007–0,1 ppm.
    Notes: Abstract The power of detection of flame AAS for trace elements decreases considerably in presence of manganese. For the purity control of manganese and manganese compounds, therefore, it is necessary to separate the traces from the main component of the samples. For that purpose the traces were complexed by 1,10-phenanthroline and coprecipitated by silver iodide as trace collector. To receive a trace solution of 10 ml being free of manganese the filtered AgI was boiled with HNO3. The enriched elements (Fe, Co, Ni, Cu, Zn, Cd, Pb, Bi and Tl) were determined by flame AAS. Using samples of 5 to 10 g of manganese or manganese compounds of different stages of oxidation the limits of detection of the various elements were found to be in a range between 0.01 and 1 ppm. By evaporation of the trace solution down to 1 ml and determination of the traces by the “injection method” of flame AAS limits of detection are obtained between 0.007 and 0.1 ppm.
    Type of Medium: Electronic Resource
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
  • 49
    Electronic Resource
    Electronic Resource
    Springer
    Fresenius' Zeitschrift für analytische Chemie 283 (1977), S. 303-303 
    ISSN: 1618-2650
    Keywords: Best. von Blei in Boden ; Spektralphotometrie, Atomabsorption ; Matrixeinfluß
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
  • 50
    Electronic Resource
    Electronic Resource
    Springer
    Fresenius' Zeitschrift für analytische Chemie 284 (1977), S. 19-21 
    ISSN: 1618-2650
    Keywords: Best. von Verunreinigungen in Phosphor ; Spektralphotometrie, Atomabsorption ; Trennungen
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Zusammenfassung Nach Oxydation der Probe zu H3PO4 mit HNO3/HCl werden die Kationen an einem stark sauren Kationenaustauscher gebunden, mit HCl eluiert und durch AAS bestimmt. Von den häufigsten Verunreinigungen des reinen roten Phosphors werden die Alkali- und Erdalkalielemente sowie die meisten Schwermetalle erfaßt. Fe und As werden nicht abgetrennt, Al nur teilweise. Fe und Al werden durch Extraktion ihrer Oxinate isoliert. As wird aus HBr mit Benzol extrahiert und über die AsH3-Reaktion bestimmt.
    Notes: Abstract After oxidizing the sample to H3PO4 with HNO3/HCl, the cations are absorbed on a strong acid cation exchange resin. They are eluted with HCl and are determined by AAS. Under the most commonly found impurities of high-purity red phosphorus, the alkali and alkaline earth elements and most of the heavy metals can be separated. Fe and As are not separated, Al is partially separated. Fe and Al are isolated by extraction of their 8-quinolinol compounds. As is extracted from HBr with benzene and is determined by means of the AsH3-method.
    Type of Medium: Electronic Resource
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
  • 51
    ISSN: 1618-2650
    Keywords: Spektralphotometrie, Atomabsorption ; flammenlos, systemat. Fehlerquellen
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Zusammenfassung Es wird versucht, an Hand ausgewählter Elemente (Fe, Co, Ni, Ag und Cd) schwerwiegende systematische Fehler bei der Bestimmung durch flammenlose Atomabsorptionsspektrometrie aufzuzeigen und deren Ursache zu diskutieren. Neben den Parametern des Temperaturprogramms und des Schutzgasstroms ist die Art und Struktur des Graphits, sowie dessen Reaktivität von entscheidendem Einfluß auf Empfindlichkeit und Nachweisvermögen des Verfahrens. „Depressionen“ bei der Verwendung stark saurer Analysenlösungen werden bestätigt und es wird versucht, diese im Zusammenhang mit der Reaktivität von Graphit zu erklären. An einem vereinfachten Modell wird der Einfluß organischer Lösungsmittel bzw. organischer Lösungen von Komplexbildnern wie Dithizon, NH4-DDTC und APDC auf die Atomisierung untersucht. Es wird diskutiert, ob die dabei registrierten „Depressionen“ Verluste sind, die durch die Bildung flüchtiger metallorganischer Verbindungen bereits bei Temperaturen ab 500° C entstehen. Besonders schwerwiegend sind diese Verlustreaktionen bei Anwesenheit halogenierter Kohlenwasserstoffe, wie an Hand der Reaktionen von Fe, Cd, Co, Ni und Ag mit Chloroform gezeigt werden kann.
    Notes: Abstract With selected elements (Fe, Co, Ni, Ag and Cd), the serious systematic errors inherent in flameless atomic absorption spectrometry are demonstrated and their origins are discussed. Besides the parameters of the temperature program and the inert gas stream, the type and structure of the graphite, as well as its reactivity have a decisive influence on the sensitivities and limits of detection of the technique. Depression of the signal is observed with the use of strongly acid solutions and it has been attempted to explain this in connection with the reactivity of the graphite. The influence of organic solvents and organic solutions of complexes with dithizone, NH4-DDTC and APDC on the atomization have been investigated with simplified examples. It can be presumed that the resulting depression of the signal is due to losses by the formation of volatile metal-organic compounds at temperatures above 500° C. Particularly large are the losses in the presence of hydrocarbon halides as can be demonstrated by the reaction of Fe, Cd, Co, Ni, and Ag with chloroform.
    Type of Medium: Electronic Resource
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
  • 52
    Electronic Resource
    Electronic Resource
    Springer
    Fresenius' Zeitschrift für analytische Chemie 284 (1977), S. 41-41 
    ISSN: 1618-2650
    Keywords: Best, von Kupfer, Nickel, Kobalt in Geolog. Material ; Spektralphotometrie, Atomabsorption ; Extraktion
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
  • 53
    Electronic Resource
    Electronic Resource
    Springer
    Fresenius' Zeitschrift für analytische Chemie 285 (1977), S. 111-120 
    ISSN: 1618-2650
    Keywords: Chromatographie, Dünnschicht ; Steuergerät zur automatischen Registrierung
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Zusammenfassung Ein Gerät zur vollautomatischen Steuerung eines DC-Spektralphotometers wurde entwickelt. Zusätzlich zur automatischen Registrierung aller Spuren eines Dünnschicht-Chromatogramms werden Remissionsminima erkannt und ihre Remissionsgrade und Ortskoordinaten ausgedruckt. Eine zweite Betriebsart ermöglicht ein manuelles Abrastern und Ausmessen eines Fleckes an jeder beliebigen Stelle der DC-Platte. Ein Rechneranschluß zur Auswertung der Meßergebnisse ist vorhanden. An Hand von Beispielen wird gezeigt, daß Reproduzierbarkeits- und Konzentrationsfehler bei der automatischen Registrierung strichförmiger Flecke wesentlich kleiner sind als bei Handpositionierung kreisförmiger Flecke. Die Linearität verschiedener Analysenfunktionen wird über 2 Zehnerpotenzen der Strichbelegung untersucht. Dabei erweist sich die Kubelka-Munk-Funktion in bezug auf Linearität allen anderen untersuchten Funktionen überlegen. Eine Kosten-Nutzen-Rechnung zeigt, daß in einem Routinelabor durch Einsatz eines Auftragegerätes und eines Steuergerätes für die automatische Registrierung trotz höherer Investitionskosten die Gesamtkosten einer Analyse um 70% gesenkt werden können.
    Notes: Abstract An instrument has been constructed for the automatic control of a TLC spectrophotometer. In addition to the automatic scanning of all tracks of a thin-layer chromatogram the positions and values of diffuse reflectance minima are recognized and printed. A second mode allows the manual scanning and measurement of a spot at any position on the TLC plate. A digital output is provided for the evaluation of the results with a computer. The errors of reproducibility and of concentration are much smaller using the automatic scanning of bands than using the manual positioning of circular spots as the examples show. The linearity of several analytical functions is analysed within two decades of concentration. The Kubelka-Munk function was found to be superior in linearity to all other functions studied. Calculations of costs show, that the total costs of an analysis in a routine laboratory can be lowered to an extend of about 70% by the use of an application instrument and a controlling instrument for automatic scanning inspite of the higher costs of investments.
    Type of Medium: Electronic Resource
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
  • 54
    Electronic Resource
    Electronic Resource
    Springer
    Fresenius' Zeitschrift für analytische Chemie 285 (1977), S. 270-270 
    ISSN: 1618-2650
    Keywords: Trenn. von Aryl-p-methoxybenzoylbenzofuranyl-thiosemicarbazonen, Contraceptiva ; Chromatographie, Dünnschicht
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
  • 55
    Electronic Resource
    Electronic Resource
    Springer
    Fresenius' Zeitschrift für analytische Chemie 286 (1977), S. 95-99 
    ISSN: 1618-2650
    Keywords: Nachw. von Herbiciden ; Chromatographie, Dünnschicht ; Dansylierung
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Zusammenfassung Die Reaktion von Dansylchlorid mit verschiedenen Herbiciden und Derivaten, die Aminogruppen enthalten oder zu Anilinen hydrolysierbar sind, wird beschrieben. Auf der Dünnschichtplatte lassen sich die fluorescierenden Stoffe gut trennen und identifizieren, was anhand von schematischen Darstellungen der Dünnschicht-Chromatogramme gezeigt wird.
    Notes: Abstract The reaction of dansyl chloride with various herbicides and derivatives containing amino groups or hydrolyzable to anilines is described. On TLC plates the fluorescent substances can be readily separated and identified as shown by diagrammatic representation of the thin-layer chromatograms.
    Type of Medium: Electronic Resource
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
  • 56
    Electronic Resource
    Electronic Resource
    Springer
    Fresenius' Zeitschrift für analytische Chemie 286 (1977), S. 247-247 
    ISSN: 1618-2650
    Keywords: Trenn. von Diolen ; Chromatographie, Dünnschicht
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
  • 57
    Electronic Resource
    Electronic Resource
    Springer
    Fresenius' Zeitschrift für analytische Chemie 286 (1977), S. 248-248 
    ISSN: 1618-2650
    Keywords: Trenn. von Ketoester-Kupplungsprodukten ; Chromatographie, Dünnschicht ; Aryldiazoniumchloride
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
  • 58
    Electronic Resource
    Electronic Resource
    Springer
    Fresenius' Zeitschrift für analytische Chemie 286 (1977), S. 249-249 
    ISSN: 1618-2650
    Keywords: Trenn. von Thiosemicarbaziden ; Chromatographie, Dünnschicht ; 4-phenyl-substituiert
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
  • 59
    Electronic Resource
    Electronic Resource
    Springer
    Fresenius' Zeitschrift für analytische Chemie 286 (1977), S. 250-250 
    ISSN: 1618-2650
    Keywords: Trenn. von 5,5-Dimethylcyclohexan-2-arylhydrazon-1,2,3-trionen ; Chromatographie, Dünnschicht
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
  • 60
    Electronic Resource
    Electronic Resource
    Springer
    Fresenius' Zeitschrift für analytische Chemie 286 (1977), S. 255-255 
    ISSN: 1618-2650
    Keywords: Trenn. von Kationen ; Chromatographie, Dünnschicht ; ÄDTA-imprägn. Platten
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
  • 61
    Electronic Resource
    Electronic Resource
    Springer
    Fresenius' Zeitschrift für analytische Chemie 286 (1977), S. 254-254 
    ISSN: 1618-2650
    Keywords: Trenn. von Arylbenzimidazolyl-thiocarbamiden, Antithyroide Mittel ; Chromatographie, Dünnschicht
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
  • 62
    Electronic Resource
    Electronic Resource
    Springer
    Fresenius' Zeitschrift für analytische Chemie 287 (1977), S. 23-27 
    ISSN: 1618-2650
    Keywords: Best. von Cadmium in Wasser ; Spektralphotometrie, Atomabsorption ; flammenlos, Kulturwasser-Meeresorganismen
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Summary For the determination of cadmium in culture water from toxicological experiments with marine organisms direct flameless atomic absorption spectrophotometry seems to be an appropriate method, because it is less complicated than any combination with an extraction method. Unfortunately, it cannot be applied in the μg·l−1-range without modifications, because matrix effects lead to unacceptable variations in the results. It was found that these difficulties can be overcome by the addition of ammonium peroxodisulphate and sulphuric acid. A routine method basing on this effect has been developed.
    Notes: Zusammenfassung Zur Cadmiumbestimmung in Kulturwasser von toxikologischen Versuchen mit marinen Organismen scheint die direkte flammenlose Atomabsorptions-Spektralphotometrie besonders geeignet zu sein, denn sie ist weniger umständlich als jede Kombination mit einer Extraktionsmethode. Ohne Modifikationen kann die Direktbestimmung jedoch im μg/l-Bereich nicht eingesetzt werden, denn Matrixeffekte bewirken allzu starke Streuungen der Meßergebnisse. Es wird gezeigt, daß ein Zusatz von Ammoniumperoxodisulfat und Schwefelsäure zur Probenlösung eine deutliche Verbesserung bewirkt. Eine Routinemethode wurde entwickelt, bei der von diesem Effekt Gebrauch gemacht wird.
    Type of Medium: Electronic Resource
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
  • 63
    Electronic Resource
    Electronic Resource
    Springer
    Fresenius' Zeitschrift für analytische Chemie 287 (1977), S. 264-270 
    ISSN: 1618-2650
    Keywords: Best. von Benzpyren in Schwebstaub ; Chromatographie, Dünnschicht ; Routinemethode
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Zusammenfassung Es wird ein Verfahren zur dünnschicht-chromatographischen Bestimmung von Benz(a)pyren im Schwebstaub beschrieben, bei dem nach Extraktion mit Cyclohexan im Ultraschallbad die Trennung eindimensional auf Celluloseacetat-Folien nacheinander mit den Laufmitteln 95%ig. Äthanol/Dichlormethan (8∶2) und Pyridin/Methanol/Wasser (3∶5∶2) durchgeführt wird. Die Auswertung erfolgt fluorimetrisch direkt auf der Platte. Das Verfahren, das eine sichere Abtrennung des Benz(a)pyrens von Benz(k)fluoranthen und Anthanthren erlaubt, ist für die Bestimmung von 0,4–20 ng Benz(a)pyren/m3 Luft bei 24stündiger Probenahme mit einem „High Volume Air Sampler“ geeignet. Eine Erweiterung des Arbeitsbereiches nach oben und unten ist möglich. Der Gesamtzeitbedarf für die Analyse von drei Filterproben beträgt rund 5 h, von denen etwa 3 h auf die chromatographische Entwicklung entfallen.
    Notes: Summary A method is described for the thin-layer chromatographic determination of benzo(a)pyrene in suspended particulate matter, including the ultrasonic extraction with cyclohexane and the separation on cellulose acetate thin-layer foils by subsequent development in one direction with 95% ethanol-dichloromethane (8∶2) and pyridine-methanol-water (3∶5∶2). The quantitative evaluation is carried out by fluorimetric scanning of the plate. The method permits a reliable separation of benzo(a)pyrene from benzo(k)fluoranthene and anthanthrene and is suited for the determination of 0.4–20 ng of benzo(a)pyrene/m3 of air, if sampling is done with a High Volume Air Sampler during 24 h. The total time necessary to analyze three filters is about 5 h, wherein the chromatographic development takes 3 h.
    Type of Medium: Electronic Resource
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
  • 64
    Electronic Resource
    Electronic Resource
    Springer
    Fresenius' Zeitschrift für analytische Chemie 287 (1977), S. 312-313 
    ISSN: 1618-2650
    Keywords: Trenn. von Bixanthenen ; Chromatographie, Dünnschicht ; Mikrobestimmung
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
  • 65
    Electronic Resource
    Electronic Resource
    Springer
    Fresenius' Zeitschrift für analytische Chemie 287 (1977), S. 317-319 
    ISSN: 1618-2650
    Keywords: Best. von Eisen in Biolog. Material ; Spektralphotometrie, Atomabsorption ; Druckaufschluß
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
  • 66
    Electronic Resource
    Electronic Resource
    Springer
    Fresenius' Zeitschrift für analytische Chemie 287 (1977), S. 319-319 
    ISSN: 1618-2650
    Keywords: Trenn. von Carbamyldimethylarylazopyrazolen ; Chromatographie, Dünnschicht
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
  • 67
    Electronic Resource
    Electronic Resource
    Springer
    Fresenius' Zeitschrift für analytische Chemie 288 (1977), S. 28-31 
    ISSN: 1618-2650
    Keywords: Nachw. und Trenn, von Seltenen Erden in Erzen, Monazit, Techn. Produkten ; Chromatographie, Dünnschicht ; Di-isopropyläther/Tetrahydrofuran/HNO3
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Zusammenfassung In Monaziten, technischen Produkten und Reinelementen (Verbindungen) wurden die Seltenen Erden dünnschicht-chromatographisch mit dem Laufmittel Di-isopropyläther-Tetrahydrofuran-Salpetersäure (65%) (100∶70∶6) getrennt und nachgewiesen. Mengenverhältnisse von 400∶1 sind zu trennen und eindeutig zu identifizieren. Bei größeren Unterschieden in den Rf-Werten kann das Verhältnis bis zu 1000∶1 betragen. Die absolut nachweisbare Menge auf einem Chromatogramm beträgt 0,05–0,1 μg. Die Größe der Flecken ermöglicht eine halbquantitative Abschätzung der Gehalte. Die Analysendauer beträgt mit Aufschluß 2 h, ohne Aufschluß 70 min.
    Notes: Summary In monazites, technical products and pure elements, rare earth elements were separated and identified by thin-layer chromatography using a 100∶70∶6 mixture of diisopropyl ether, tetrahydrofuran and HNO3 (65%) as an eluent. It is possible to separate and characterize them in concentrations of 400∶1 unambiguously. If the Rf-values differ remarkably a ratio of 1000∶1 is acceptable. The amount absolutely detectable on a chromatogram is 0.05–0.1 μg. The area of the spots allows a semiquantitative estimation. The time required for one analyses is without decomposition 70 min and including decomposition 2 h.
    Type of Medium: Electronic Resource
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
  • 68
    Electronic Resource
    Electronic Resource
    Springer
    Fresenius' Zeitschrift für analytische Chemie 288 (1977), S. 62-62 
    ISSN: 1618-2650
    Keywords: Best. von Kupfer, Zink, Nickel, Kobalt, Mangan und Eisen ; Spektralphotometrie, Atomabsorption ; Extraktion mit Phenylmethylbenzoylpyrazolon
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
  • 69
    Electronic Resource
    Electronic Resource
    Springer
    Fresenius' Zeitschrift für analytische Chemie 288 (1977), S. 191-192 
    ISSN: 1618-2650
    Keywords: Best, von Blei in Pflanzen ; Spektralphotometrie, Atomabsorption ; Reduktion zu metall. Blei
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Summary A new method for determining the lead content of plants has been developed. The dried, ground sample of a plant is first heated in oxygen to decompose the organic material. The lead is then reduced in hydrogen to elemental lead which sublimes and condenses in a capillary. The sublimed lead is dissolved in nitric acid and the lead concentration is determined by atomic absorption spectroscopy.
    Notes: Zusammenfassung Das getrocknete und zerkleinerte Pflanzenmaterial wird im Sauerstoffstrom bei höherer Temperatur verascht. Nach Erhitzen im Wasserstoffstrom wird das Blei verdampft und im Kondensat durch Atomabsorptionsspektroskopie bestimmt.
    Type of Medium: Electronic Resource
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
  • 70
    Electronic Resource
    Electronic Resource
    Springer
    Fresenius' Zeitschrift für analytische Chemie 288 (1977), S. 273-276 
    ISSN: 1618-2650
    Keywords: Best. von Vanadium, Elementen in Schmierölen ; Spektralphotometrie, Atomabsorption ; flammenlos, Anpassung der Wickbold-Apparatur
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Zusammenfassung Die Verbrennungsapparatur nach Wickbold wurde durch Veränderungen am Saugbrenner, am vorderen Flammenrohr, am Kühlsystem und durch Verwendung von Wirbelrohren und eines Überdruckventils der Verbrennung von Erdölprodukten, speziell von gebrauchten Schmierölen, angepaßt. Zur Überprüfung der Apparatur wurde Vanadium in einer synthetischen Testlösung bestimmt. Die Endbestimmung nach der Verbrennung erfolgte durch flammenlose Atomabsorptionsspektrometrie in einer Graphitrohrküvette nach Massmann.
    Notes: Summary The Wickbold combustion apparatus has been modified for decomposition of petroleum products, especially of used lubricating oils. Modifications were made concerning the suction burner, the front of the combustion chamber and the cooling system in conjunction with adding a mixing tube and a pressure limiting valve. The improved apparatus was tested by the vanadium determination in a synthetic sample. After combustion the measurement was performed by flameless atomic absorption spectroscopy using a Massmann graphite tube.
    Type of Medium: Electronic Resource
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
  • 71
    Electronic Resource
    Electronic Resource
    Springer
    Fresenius' Zeitschrift für analytische Chemie 288 (1977), S. 285-285 
    ISSN: 1618-2650
    Keywords: Trenn. von Aminothiazolyl-benzothiazolen ; Chromatographie, Dünnschicht
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
  • 72
    Electronic Resource
    Electronic Resource
    Springer
    Fresenius' Zeitschrift für analytische Chemie 288 (1977), S. 288-288 
    ISSN: 1618-2650
    Keywords: Trenn. von Seltenen Erden aus Uran ; Chromatographie, Dünnschicht
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
  • 73
    Electronic Resource
    Electronic Resource
    Springer
    Fresenius' Zeitschrift für analytische Chemie 288 (1977), S. 344-347 
    ISSN: 1618-2650
    Keywords: Best. von KieselsÄure ; Spektralphotometrie, Atomabsorption ; Auflösung mit Flu\sÄure, Einflu\ von Begleitstoffen
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Zusammenfassung Zur analytischen Bestimmung der KieselsÄure bzw. des Siliciums durch AAS wird die Möglichkeit der praktisch verlustfreien Auflösung in Flu\sÄure-SalzsÄure in offenen PlastikgefÄ\en über Versuchsergebnisse bestÄtigt. Versuche zur überprüfung von Störungen der KieselsÄurebestimmung in solchen Lösungen durch die Gegenwart von Begleitstoffen zeigten keine Beeinflussungen der Me\ergebnisse. Nach der Anwendung der Analysenmethode zur Siliciumbestimmung in ausgewÄhlten Proben, deren KieselsÄuregehalte in Flu\sÄure löslich sind und ebenso in resistenteren Materialien, wurden die Ergebnisse denen durch klassische Bestimmungen ermittelten gegenübergestellt.
    Notes: Summary Silicic acid resp. silicon can be quantitatively dissolved in a mixture of hydrofluoric acid and hydrochloric acid in open plastic containers. The solution is suitable for quantitative analyses of the silicon content by atomic absorption spectrometry. It can be shown experimentally that the results are not influenced by the presence of other elements in the solution. A comparison has been made between the classical method of silicon analysis and atomic absorption spectrometry using samples containing readily soluble silicic acid and also natural ores which are rather difficult to dissolve.
    Type of Medium: Electronic Resource
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
Close ⊗
This website uses cookies and the analysis tool Matomo. More information can be found here...