showing 36 of ~574560 from 574555 documents
Zur Ökologie Abwasserbelasteter Altrheine
1977
The backwaters of the Upper Rhine can be divided into two types, namely the Sondernheim type and the Leimersheim type. The first one obtains its water mainly from small tributaries of the Rhine, the latter one by the Rhine itself. Both of them are polluted to nearly the same extent by organic matter. In the Sondernheim type biological decomposition starts intensively. It leads to mass-production of a few animal species in the upper, to less production of a large number of animal species in the lower part of its flow. In the Leimersheim type neither biological decomposition, nor mass-production nor a high species-diversity are to be observed. The possible causes of this difference are under …
Demografia de los inmigrados
1977
En torno a un Grafito Ibérico de Fuenvich (Requena)
1977
[ES] Se trata de un grafito realizado en caracteres del tipo «levantino» de uso común desde La Contestania a la Galia Narbonense. Consta de un solo letrero que hay que juzgar como ibérico. Ha sido escrito sobre una pátera. El grafito podría ser un nombre personal. Por haber aparecido en un asentamiento ibero-romano, hay que considerarlo dentro del proceso de romanización (siglo I a. C, fecha en que se data el grafito).
Contra el imperialismo cultural
1977
Reseña en español de la ""I Conferencia internacional sobre el Imperialismo Cultural"". Argel, Argelia, 11-15 de octubre de 1977."
Untersuchung einer Methode zur Bestimmung von Blei, Cadmium, Quecksilber, Arsen und Tellur in Lebensmitteln mit Hilfe der Röntgenfluorescenzanalyse
1977
Der Aufschlus von Nahrungsmitteln tierischen Ursprungs mit Salpetersaure-Schwefelsaure in einer Polyathylenflasche bei 60° C und mit Salpetersaure in einem Bombengefas bei 150° C wurde untersucht. Beide Verfahren liefern befriedigende Ergebnisse. Im zweiten Fall besteht wegen kleinerer Reagensmengen jedoch eine geringere Gefahr des Einschleppens von Blindwerten. Blei, Cadmium und Quecksilber konnen aus der Aufschluslosung durch Adsorption an dem Austauscherharz Chelex 100 oder durch Fallung mit Ammonium-pyrrolidindithiocarbamat unter Zusatz von Kupfer als Trager abgetrennt werden. Arsen und Tellur lassen sich anschliesend zusammen mit Kupfertrager durch Schwefelwasserstoff ausfallen. Die Au…
K Cell Activity of Normal and Chronic Lymphocytic Leukaemia Lymphocytes: Association with Lymphocytes bearing Receptors for Human C3b
1977
Surface properties of effector cells in antibody-dependent cell mediated cytotoxicity (ADCC) are at present under intensive investigation. Among these cells a lymphocyte population (K cells) has been described with receptors for the Fc portion of IgG (4), receptors for complement (11) and lacking receptors for sheep red blood cells (SRBC) and surface immunoglobulin (13). The purpose of the present study was to investigate more thoroughly the relationship between K cell activity in ADCC and cells bearing receptors for C3b and C3d.
Vidal-Beneyto y García Trevijano. Un cierto desencanto
1977
Sobre l'avenir de les nostres escoles
1977
El document forma part dels materials docents programats mitjançant l'ajut del Servei de Política Lingüística de la Universitat de València. Traducció del castellà al català del text de F. Nietzsche "Sobre el porvenir de nuestras escuelas", segons l'edició de 1977 de l'editorial Tusquets.
Archivo de arte valenciano, 1977, año 48
1977
Revista editada por Real Academia de Bellas Artes de San Carlos
Metabolic epoxidation of trans-4-acetylaminostilbene: A protective mechanism against its activation to a mutagen
1976
Abstract Trans -4-acetylaminostilbene is activated by liver preparations to mutagens for Salmonella typhimurium . Since this compound is metabolized to the trans -α,β-epoxide and since many epoxides are ultimate mutagens, this epoxide was tested for direct mutagenicity. It was, however, found to be non-mutagenic, and, in contrast to the parent compound, the epoxide was no longer activated by liver preparations to mutagens. The same was found for the β-ketone and for the threo -α,β-dihydrodiol, which are formed metabolically from trans -4-acetylaminostilbene and from its α,β-epoxide. 4-Acetylaminobibenzyl showed a very weak mutagenic activity in the presence of the liver preparation. Thus, i…
Presence of muscarinic inhibitory and absence of nicotinic excitatory receptors at the terminal sympathetic nerves of chicken hearts.
1976
Nicotine (2 X 10(-4) M) or acetylcholine (5.5 X 10(-4) M) in the presence of 3 X 10(-6) M atropine did not increase the rate or amplitude of contraction in isolated atria or ventricular strips of the chicken heart; both drugs also did not cause an output of noradrenaline or adrenaline and did not evoke antidromic discharges in the right sympathetic nerves of isolated perfused chicken hearts. In contrast, "high K+-solutions" evoked an output of noradrenaline and adrenaline and caused a burst of antidromic discharges. Dimethylphenylpiperazine (DMPP; 3.1 X 10(-4) M), by a tyramine-like action, elicited a small output of noradrenaline and increased rate and amplitude of contraction" but did not…
Über den thermischen Abbau von alternierenden Copolyamiden im Massenspektrometer
1976
Primary perireticulin amyloidosis in a 14-year-old girl.
1976
A primary perireticulin amyloidosis is reported in a 14-year-old girl, which showed the symptoms of a steroid-resistant nephrotic syndrome. The diagnosis was established by biopsies of kidney and rectum. Occurrence of amyloidosis in childhood and the clinical picture are discussed and references to clinical trials carried out are given.
Evolution of a Quantum System: Lifetime of a Determinant
1976
A measure of the ''dependency'' of a many-particle system is defined and its time dependence is evaluated for systems initially described by a single Slater determinant. An uncertainty product between the energy spread of the initial determinant and the lifetime of a system's independence is established. Numerical estimates of some lifetimes are given. They are not so long as to be reassuring for nuclear time-dependent Hartree--Fock calculations. Each separate case ought to be checked. 1 table.
Coulomb Corrections in Proton-Deuteron Scattering
1976
We present the first calculations of differential cross sections for elastic proton-deuteron scattering using a three-body formalism which correctly takes into account the Coulomb repulsion between the two protons.
Eine Kennzeichnung der endlichen desarguesschen Hjelmslev-Ebenen
1976
Zur Gleichartigkeit der reduktiven Spaltung einiger Substrate durch elektrochemisch und mit Natrium erzeugte Radikal-Anionen
1976
X-ray topographic study of solid-state polymerized poly-[1,2-bis-(p tolylsulphonyloxymethylene)-1-butene-3-inylene]
1976
Local extinction contrast effects have been observed in macroscopic polymer crystals, using Berg-Barrett X-ray topography. Results from as-polymerized crystals indicate that the crystals are perfect enough for defect regions to be imaged. As-polymerized crystals exhibited apparent defects lying along [021]. [010] slip traces in the (100) surface of a crystal were imaged; the slip system here appears to be consistent with (h01) [¯10h], forh, l ≠ 0 and [010] the chain direction.
Blood Pressure Response to Physical Activity in Hypertensive Subjects at Different Times of the Day
1976
1. Active orthostasis causes a fall of systolic blood pressure in the morning; this fall was more extensive in severe arterial hypertension. 2. Everyday physical activity produces a marked rise of systolic blood pressure, which is higher at noon and in the evening than in the morning; the hypertensive response is somewhat greater in WHO II and III, than in WHO I, grades of hypertension. 3. In studies on blood pressure behaviour in hypertensive subjects the circadian variability not only of the blood pressure at rest but also of the blood pressure response to various stimuli has to be considered.
Verschiedenartige Additionsreaktionen von 2-Cyano-2-propylradikalen an p-Tolylmethacrylat und 4-Cyclohexylphenylmethacrylat
1976
Durch Umsetzung von p-Tolylmethacrylat oder 4-Cyclohexylphenylmethacrylat in stark verdunnter, siedender Benzollosung mit einem sehr grosen Uberschus an 2,2′-Azoisobutyronitril wurden die erwarteten Additionsprodukte mit 2-Cyano-2-propylradikalen (1) erhalten, namlich p-Tolyl- bzw. 4-Cyclohexylphenyl-[4-cyano-2-(2-cyano-2-propyl)-2,4-dimethyl]valerianat (3a bzw. 3b) mit rund 50% Ausbeute. Daneben wurden p-Tolyl- bzw. 4-Cyclohexylphenyl-(4-cyano-4-methyl-2-methylen)valerianat (4a bzw. 4b), p-Tolyl- bzw. 4-Cyclohexylphenyl-[4-cyano-2(2-cyano-2-methyl-1-propyl)-4-methyl]valerianat (5a bzw. 5b), p-Tolyl- bzw. 4-Cyclohexylphenyl-(4-cyano-2,4-dimethyl)valerianat (6a bzw. 6b) und p-Tolyl- bzw. 4-C…
Constant-potential electrolysis: determination of diffusion coefficients of thallium by using a hanging mercury drop electrode.
1976
The technique of constant-potential electrolysis at a stationary spherical electrode (hanging mercury drop) was investigated for the determination of the diffusion coefficient of Tl(I) in sodium citrate-sodium hydroxide medium and of Tl in mercury. Current-time curves, at controlled potential, were obtained, covering periods from 1 to 25 sec after the start of the electrolysis. The influence of applied potential, time of electrolysis, convection and shielding of the electrode was studied.
Trismus resulting from central nervous system lesion.
1976
Three cases of unusual trismus are reported, occurring in patients with lesions of the central nervous system. On the basis of the clinical and electromyographical findings and observation of the course of the trismus this is interpreted as a symptom of a lesion of the brain stem, causing a dis-synergism of the masticatory muscles.
ANOMALOUS SPIN STATES OF IRON (II) IN MÖSSBAUER EMISSION SPECTRA OF [57 Co(2-CH3-phen),] (ClO4)2.2 H2O AND [57Co(2-CH3O-phen)3] (ClO4)2.H2O
1976
�ber Charaktere mehrfach transitiver Gruppen
1976
Pharmakologisch aktive Polymere, 14. Modellsysteme zur Untersuchung der Abspaltung niedermolekularer Komponenten von polymeren Pharmaka
1976
false
1976
Operator mixing and scaling deviations in asymptotically free field theories
1976
Predictions of asymptotically free field theories for scaling deviations of the structure functions are compared with recent SLAC and Fermilab data on deep-inelastic lepton-hadron scattering. Contributions of nonsinglet as well as singlet Wilson operators are taken into account. The latter contributions are found to be non-negligible; specifically it is observed, in agreement with neutrino data, that about 60% of the proton's momentum is due to gluons. The expected quantitative pattern of scaling violations is given for a large range of ..omega.. and Q/sup 2/. (AIP)
false
1976
EXTENDED HÜCKEL MOLECULAR ORBITAL CALCULATION OF THE TEMPERATURE DEPENDENCE OF THE QUADRUPOLE SPLITTING OF [Fe(H2O)6] SiF6 AND KFeCl3
1976
A number of papers have appeared in which the temperature dependence of the quadrupole splitting has been treated, whereby covalency effects have been considered by introducing the orbital reduction factor k, with k ranging from 1.-0.7. There are, however, two problems : (1) k is unisotropic if the symmetry is lower than cubic, (2) the spin orbit coupling of the ligand electrons are usually neglected. These two problems have been treated here by using SCCEHMO [1] calculations on two examples, [Fe(H2O)6]SiF6 and KFeCl3, which have been previously delt with by other authors using ligand field theory [2, 3]. For both compounds the differences between the measured and the calculated quadrupole …
Sedimentation und Tektonik im mittleren Abschnitt des Rio Toro in der Ostkordillere NW-Argentiniens
1976
Die bis 5000 m machtigen jungkanozoischen Sedimente im Hangenden der Grupo Salta wurden im Mittelabschnitt der Quebrada del Toro auskartiert und gegliedert, wobei ein vorwiegend aus Vulkanitkomponenten bestehendes Konglomerat als Leithorizont diente. Auf diese Sedimente sind von West und Ost altere Gesteine aufgeschoben, so das sie heute nur noch in dem Rio Toro-Keilgraben erhalten sind. Anhand der wechselnden Gerollfuhrung und lokaler Diskordanzen last sich nachweisen, das durch die Hebung der westlichen und ostlichen Randschollen der kontinentale Sedimentationsraum zunehmend eingeengt wurde. Die terrestrischen Sedimente im Rio ToroKeilgraben wurden erst zu einem relativ spaten Zeitpunkt d…
The decay of 31 sec98Zr, 2.9 sec98Nb and 51 min98Nb
1976
TheΒ- andγ-radiations of98Zr and98m, g Nb have been investigated employing scintillation and semiconductor spectrometers and coincidence techniques. Sources of98Nb were produced by the98Mo(n, p)98Nb reaction, sources of98Zr by fission of235U with thermal neutrons applying chemical separations. For98Zr, a half-life of 30.7±0.4 sec and aQ β-value of 2.3±0.2 MeV were obtained, for the98Nb isomers, half-lives of 2.86±0.06 sec and 51.3±0.4 min, andQ β-values of 4.8±0.2 MeV and 4.5±0.2 MeV, respectively. Noγ-rays were observed in the decay of98Zr. The decay of 2.9 sec98Nb was found to involve 11γ-ray transitions. In the decay of 51 min98Nb, 54γ-transitions were detected. Spin and parity of 1+ and…
Rapid small-angle and wide-angle x-ray studies of crystallization behavior in polymers
1976
Small-angle and wide-angle x-ray scattering measurements, using a position-sensitive detector, were made during melt-crystallization of linear polyethylenes and PEO–PS–PEO triblock copolymer. The scattering measurements indicated that the triblock copolymer grew by the enlargement of regions in which lamellae are regularly stacked. During primary crystallization at higher temperatures similar behavior is observed in two linear polyethylenes. At lower temperatures, changes in the shape of small-angle scattering curves during the primary stage of crystallization indicate that amorphous gaps within the lamellar stacking become filled in. During secondary crystallization at higher temperatures …
Testosterone metabolism in benign prostatic hypertrophy: in vivo studies of gestonorone caproate and cyproterone acetate.
1976
Summary 18 patients with obstructive benign prostatic hypertrophy were studied. A 5-day treatment with gestonorone caproate (200 mg daily and 200 mg on alternate days) and cyproterone acetate (300 mg daily) suppressed the plasma LH and serum LH levels. Subsequently, H3-testosterone was injected intravenously and its elimination from plasma and uptake and metabolism in the BPH tissue studied. The elimination of total radioactivity and H3-testosterone from plasma was not altered after the 3 treatment regimens as compared to the control group. The uptake of total radioactivity into BPH tissue and its intraprostatic metabolism particularly to dihydrotestosterone was significantly suppressed in …
HALOGEN AS A READILY CLEAVABLE PROTECTIVE GROUP FOR REACTIVE POSITIONS IN PHENOLS AND PHENOLIC COMPOUNDS
1976
Efficiency of an on-line isotope separator system employing cooled and NaCl-loaded He-jet methods
1976
Abstract A pure helium-jet at liquid nitrogen temperature coupled to a Nielsen type ion source, and a NaCl-loaded helium-jet coupled to a hollow-cathode ion source have been investigated as means to connect a cyclotron target chamber on-line to a mass separator. Technical details and performances of some critical parts of the system are described. Total separation efficiencies measured under various experimental conditions for several nuclides vary between 0.01 and 1.0%.