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  • 1
    ISSN: 1432-0800
    Source: Springer Online Journal Archives 1860-2000
    Topics: Energy, Environment Protection, Nuclear Power Engineering , Medicine
    Notes: Summary In the so-called BIMAS PROJECT area of East Java investigations concerning Thiodan residues were made in the waters of the main waterway Brantas. The samples were taken from the water system towards the end of the main campaign of treatment with the insecticide Thiodan. Rivers, canals, fish ponds in the coastal area and sea water were analysed. It was found that on the average a low Thiodan content resulting from quick degradation of Thiodan existed in the flowing water system. In the fish ponds filled with water from the canal system, the residue values were almost below the detection limit (0.00003 ppm). The water of the Madura Sea contained insignificant residues in the top layer of fresh water near the river deltas. The sea water was free from Thiodan.
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  • 2
    ISSN: 1432-0800
    Source: Springer Online Journal Archives 1860-2000
    Topics: Energy, Environment Protection, Nuclear Power Engineering , Medicine
    Notes: Summary Endosulfan residues declined rapidly — within three to five days — in the water of THIODAN treated test rice fields near Pandaan (East Java). Terminal residues in the water amounted to 0.0005–0.0008 ppm. These residues were due to the constant large scale application in this area. It was noted, that fish are able to tolerate short time exposure of endosulfan concentrations 4 times the LC100. In the mud of submerged as well as dried rice fields, only very low residues (1.9 ppm maximum) were found. The increasing sulfate equivalent in the total residue points to decomposition of the chemical. The biocoenosis, which was impaired at the beginning of the test, reappeared after completion of the test.
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  • 3
    ISSN: 1433-2965
    Keywords: Key words:Cortical shell – Fractal methods – High-resolution computed tomography (HR-CT) – Lumbar vertebrae – Spongiosa structure
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract: Different noninvasive techniques for the assessment of the individual fracture risk in osteoporosis are introduced, and the relation between structural properties of high-resolution computed tomography (HR-CT) images of vertebral bodies, their bone mineral density (BMD) and the fracture load is analyzed. In 24 unfractured lumbar vertebrae with different degrees of demineralization from six specimens, the trabecular and cortical BMD was determined using quantitative CT. A lateral X-ray image revealed the number of fractures in the entire spine. A structural analysis of spongy and cortical bone was performed based on the HR-CT images. In the spongiosa, the fractal dimension was calculated as a function of the threshold value. In the cortical shell, the maximum number of clusters of low BMD was determined at varying threshold values. After the CT measurements the vertebrae were excised and compressed until fractured. On the basis of the spongiosa BMD and the number of fractures, 3 cases were found to be severely osteoporotic; the other 3 cases showed osteopenia. The average fracture loads were determined as 3533 N for the non-osteoporotic cases (range 2602–5802 N) and 1725 N for the osteoporotic cases (range 1311–2490 N). The parameters were determined as follows: average spongiosa BMD 115.2 mg/ml (101.8–135.3 mg/ml) for the non-osteoporotic cases, 46.2 mg/ml (34.8–57.6 mg/ml) for the osteoporotic cases; average cortical BMD 285.1 mg/ml (216.4–361.9 mg/ml) for the non-osteoporotic cases, 136.1 mg/ml (142.5–215.2 mg/ml) for the osteoporotic cases; spongiosa structure: average 0.5 (range 0.32–0.75) for the non-osteoporotic cases, average 1.05 (range 0.87–1.24) for the osteoporotic cases; cortical structure: average 81 (range 55–104) for the non-osteoporotic cases), average 136 (range 102–159) for the osteoporotic cases. Single parameters (BMD and structure) and weighted sums of these parameters were correlated with the fracture load, resulting in correlation coefficients of r sBMD= 0.82 (spongiosa BMD), r cBMD= 0.82 (cortical BMD), r sStr=–0.75 (spongiosa structure) and r cStr=–0.86 (cortical structure). The weighted sum of cortical and spongiosa BMD resulted in r BMD= 0.86, of cortical and spongiosa structure in r Str=–0.86. A weighted combination of all four parameters correlates with the fracture load at r 4= 0.89, all correlations being statistically significant (p〈0.0001). The four individual parameters show only a slight overlap between non-osteoporotic and osteoporotic subjects. The high correlation of the cortical BMD and the structural parameter in cortical bone indicates the important contribution of the cortical shell to vertebral stability. A weighted sum of multiple parameters results in a higher correlation with the fracture load and does not show an overlap between the two groups. It is best suited to estimate the individual fracture risk. The presented methods are generally applicable in vivo; and allow an improvement of the diagnosis of osteoporosis compared with the measurement of the BMD alone.
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  • 4
    ISSN: 1432-1831
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract Staining of lymphocytes from scrapie-infected STU mice with FITC-labelled anti-mouse Ig revealed disturbances in the capping process when compared with lymphocytes from mock-infected animals. Quantitative evaluation indicates that 10–15% of cells from scrapie-infected animals show an altered capping behaviour. These phenomena are discussed with special reference to the role of the lymphoreticular system in early scrapie agent replication.
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  • 5
    ISSN: 1420-9071
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Zusammenfassung Der Effekt von Clomifenhydrogencitrat und von Cyclofenil auf den LH-Gehalt der Hypophyse und den LH-RF-Gehalt des Hypothalamus wurde an kastrierten, weiblichen Ratten untersucht, die mit Östradiol und Progesteron blockiert worden waren. Während die Injektion von Cyclofenil im Dosisbereich von 100 bis 600 μg/Tier zu einem Abfall von sowohl LH als auch LH-RF führte, konnte bei Verabreichung von Clomifen nur bei der Gabe von 25 μg/Tier eine signifikante Herabsetzung von LH und LH-RF beobachtet werden.
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  • 6
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: The potential energy curves of the two lowest 2Σ+ (X,B) and the two lowest 2Π (A,C) electronic states of the AlF+ and AlCl+ molecular ions have been calculated using highly correlated multireference configuration interaction (MR-CI) wave functions. It is found that both 2Σ+ states and the C 2Πr state are bound, whereas the A 2Πi state is repulsive. Electronic transition moment functions for all six pairs of states of both ions have also been calculated and used for evaluation of the radiative transition probabilities between bound vibrational states. The calculated charge distributions show that the X and C states are dominated by Coulombic attraction between a doubly charged positive aluminum and the singly charged negative halogen ion. The results provide a new assignment of the photoelectron spectra of the neutral AlF. They are also in good agreement with the recently observed optical B–X emission spectra of both molecular ions and C–X bands of AlCl+. The absence of C–X emission of AlF+ is most likely due to predissociation of the C 2Πr state by the repulsive A 2Πi state.
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  • 7
    Electronic Resource
    Electronic Resource
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 87 (1987), S. 2847-2853 
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: This note reports ab initio potential curves of A 1Πu and X 1Σ+g states of C2, and the A–X radiative lifetimes. The calculations are based upon configuration interaction wave functions formed from single and double electron excitations from state-averaged MC-SCF reference functions expanded in a Gaussian basis. The lifetimes for (J′=1,v′) A 1Πu are calculated to be about 25% longer than those found in previous ab initio works, but about 25% shorter than the most recent LIF measurements of Bauer, Becker, Bielefeld, and Meuser. Also reported are the quadrupole moments of the A 1Πu and X 1Σ+g states as a function of internuclear distance and the quadrupole lifetimes of several (v′=0,J′) levels in the X state.
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  • 8
    Electronic Resource
    Electronic Resource
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 86 (1987), S. 6677-6692 
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: Potential energy, electric dipole moment, and electronic transition moment surfaces have been calculated for the A and X states of NH3 from CASSCF and CEPA electronic wave functions. Anharmonic vibrational term values, Franck–Condon factors, and A–X radiative transition probabilities for the symmetric stretching and bending modes of NH3 and ND3 have been evaluated. The theoretical absorption spectra at room and low temperatures agree well with experimental data. The symmetric stretching mode in the A state has only small intensities in the A–X absorption spectrum. Emission rates from various initial vibronic levels of the A state are given. The ab initio electric dipole moment surfaces for the ground state of NH3 have been used to compute transition moments, which are in good agreement with experimental data.
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  • 9
    Electronic Resource
    Electronic Resource
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 84 (1986), S. 3788-3797 
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: A quantum mechanical study of vibrational relaxation in the collision of N2 with 3He and 4He is reported. An ab initio potential energy surface has been computed using the coupled electron pair approximation with an extended basis set. Cross sections for v=1 → 0 vibrational relaxation have been calculated on this surface by using the centrifugal sudden approximation (CSA). The calculated vibrational relaxation rate coefficients show a very encouraging agreement with those measured in laser fluorescence experiments for the temperature range 82–291 K. Over this temperature range the rate coefficients increase by a factor close to 100. The CSA computations are also used to test the accuracy of the vibrational close coupling, rotational infinite order sudden, and the breathing sphere approximations.
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  • 10
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: In this letter we report quantum mechanical integral and differential cross sections for the title reactions as calculated on a new ab initio potential energy surface. The calculations, all carried out in the reagents arrangement channel employing negative imaginary potentials, were done within the coupled-states approximation. The final vibrational state-to-state differential and integral cross sections were compared with experiment. Altogether, a very encouraging agreement was obtained. © 1996 American Institute of Physics.
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