Herniation of an intervertebral disc with cauda compression syndrome in childhood.

1979

A case of a lumbosacral disc herniation of traumatic origin with compression of the cauda equina in a child is reported. The problems of early diagnosis, timely operative procedure, and prognosis of neurological deficit of operated disc herniation in childhood are discussed.

Kollineationen und Schliessungssätze für Ebene Faserungen

1979

Every affine central collineation of a translation plane π induces a special collineation of the projective space π spanned by the spreadF belonging to π. Here the relations between these special collineations of π and certain incidence propositions inF are investigated; so new proofs are given for some characterisations of (A,B)-regular spreads included in [7].

Rapid and direct gas chromatographic determination of oxalic acid in urine

1979

The known methods of oxalic acid determination are not suitable for reliable, rapid and economical routine analysis. A rapid gas chromatographic method has been developed which dispenses with separation operations and measures oxalic acid as a diethylester by means of back-flushing, and using malonic acid as an internal standard. One determination can be conducted within 6 to 8 min. and preparation of the specimen takes about the same amount of time. If the gas chromatographic conditions are changed and more time is permitted for analysis, numerous other extractable acidic metabolites can also be determined.

Singlet ground state magnetism: II. magnetic excitons in paramagnetic TbP

1979

The magneticΓ 1 –Γ 4 exciton of the singlet ground state system TbP has been studied by inelastic neutron scattering above the antiferromagnetic ordering temperature. Considerable dispersion and a pronounced splitting was found in the [100] and [110] directions. Both the band width and the splitting increased rapidly as the transition temperature was approached in accordance with the predictions of the RPA-theory. The dispersion is analysed in terms of a phenomenological model using interactions up to the fourth nearest neighbour.

Half-lives and delayed neutron emission probabilities of short-lived Rb and Cs precursors

1979

Half-lives and delayed-neutron emission probabilities (P n ) of short-lived Rb and Cs precursors in the mass chains 94–98 and 143–147 were measured. Sources of isotope separated nuclides were obtained from the on-line mass-separator OSTIS installed at the Grenoble high-flux reactor.

Synthesis of a bridgehead nitrogen system. Imidazo[1,5-b]pyridazine derivatives

1979

3,4-Dibenzoyl-2-oxobutyrate 4-semicarbazone (6a), ethyl 2,4-dioxo-3-phenacylvalerate 3-semicarbazone (6b) and diethyl phenacyloxalectate 3-semicarbazone (6c) via acid catalysed intramolecular cyclization afforded 2-phenyl-4-R-3H-imidazo[1,5-d]pyridazine-5,7-(6H)diones (8d,e,f). Elemental analyses and spectroscopic data (ir, nmr, ms) were in good agreement with the assigned structures.

Ecdysteroids in snails

1979

�ber ein Verfahren der Ordnung $$1 + \sqrt 2 $$ zur Nullstellenbestimmung

1979

A new iterative method for solving nonlinear equations is presented which is shown to converge locally withR-order of convergence $$1 + \sqrt 2 $$ at least under suitable differentiability assumptions. The method needs as many function evaluations per step as the classical Newton method.

Classification of human placental villi. I. Histology.

1979

The classification of human placental villi was reviewed on the basis of material prepared by means of special methods. The material from in situ normal-term placentae was biopsied by aspiration into glutaraldehyde. The classification was made on the basis of light-microscopic observations of semithin sections, reconstructions from serial sections, and scanning-electron micrographs. The peripheral villous tree is roughly divided into stem (ramuli), intermediate and terminal villi. The intermediate villi may be further subdivided as mature and immature types, which are found between the stem and terminal villi. Some of the terminal villi possess a local specialization described as the neck r…

Dexamethasone in severe head injuries

1979

The results of a double-blind-study on the effects of placebo, a low dose and a high dose of dexamethasone on severe closed head injury are presented. 95 patients were selected and carefully analyzed according to mortality, neurological course and symptoms, midbrain lesions and final outcome. The results demonstrate that dexamethasone, particularly given in high doses, reduces mortality and improves the neurological course. The steroid treatment seems to improve chances as well as quality of survival. Apart from the dose, timing of administration is of great importance.

Radiative muon capture on 12C and 16O

1979

Abstract We study exclusive radiative muon capture on 12 C(g.s.) leading to 12 B(g.s.), and on 16 O(g.s.) leading to 16 N(0 − , 120 keV). Our investigation, which is based on impulse approximation, puts special emphasis on elementary particle aspects of radiative capture, such as tests of magnitude and momentum transfer dependence of the induced pseudoscalar, and possible contributions of axial currents of second kind (weak electricity). We calculate several correlation observables which are sensitive to the nucleonic currents but depend very little on the structure of the nuclear initial and final states. In particular, it is shown that in capture on 12 C the polarization and alignment of …

H-Y antigen in the teleost.

1979

H-Y antigen, presumably the product of mammalian testis-determining genes, has been detected in three species of teleost fish, Xiphophorus maculatus, Haplochromis burtoni, and Oryzias latipes, and in hybrids of the genus Tilapia. In X. maculatus H-Y was most readily detected in YY males, suggesting that a genetic determinant of H-Y antigen expression may exist on the teleost Y-chromosome. Although H-Y was detected in males and not in females in each of the species that we studied, male heterogamety has not been firmly established for H. burtoni. Thus despite the extreme phlyogenetic conservation of H-Y genes and their association with the Y-chromosome, it remains open to question whether H-…

Studien zum Vorgang der Wasserstoffübertragung, 58. Möglichkeiten und Grenzen photochemisch induzierter asymmetrischer Synthesen

1979

T-cell-derived helper factor allows Lyt 123 thymocytes to differentiate into cytotoxic T lymphocytes.

1979

IT is generally accepted that the diversity of T-cell responsiveness is generated in the thymus1. It is also known that except for a few Lyt 1 cells all thymocytes express the Lyt 123 phenotype2,3. Surprisingly, thymocytes are poorly responsive in vitro4, and only the medullary thymocytes, comprising 5–10% of the total thymic cell population, show an in vitro responsiveness comparable with that of peripheral T cells5. Cortical thymocytes, comprising 90–95% of all thymocytes, have previously been considered to be immature and immunologically incompetent4. The result reported here show that thymocytes are able to generate alloantigen-, virus- and hapten-specific cytotoxic T lymphocytes (CTL),…

Potentiation of the mechanical behavior of the human skeletal muscle through prestretching

1979

Force-velocity and power-velocity curves in a vertical jump involving movements around several joints were derived from vertical ground reaction forces and knee angular velocities. The jumps were performed with weights from 10 to 160 kg added on the shoulders. The obtained curves from a semi-squatting static starting position resembled those reported for isolated muscles or single muscle groups. Vertical jumps were also performed in the conditions where the shortening of the leg extensors was preceded by prestretching of the active muscles either through a preparatory counter-movement or dropping down on the force-platform from the various heights ranging from 20 to 100 cm. Prestretching mo…

Mechanical power and segmental contribution to force impulses in long jump take-off

1979

Changes in total mechanical work, its partitioning into different energy states, mechanical power, force-time characteristics, force impulses of body segments and mass center's pathway characteristics during long jump take-off were investigated on four national and six ordinary level athletes. Both cinematographic and force-platform techniques were used. The data showed that the national level jumpers had higher run-up and higher take-off (release) velocities in horizontal and vertical directions. In addition, they were able to utilize efficiently the elastic energy stored in the leg extensor muscles at take-off impact. This was seen in high support leg eccentric and concentric forces, whic…

Mechanical characteristics and fiber composition of human leg extensor muscles.

1979

To investigate the influence of skeletal muscle fiber composition on the mechanical performance of human skeletal muscle under dynamic conditions, 34 physical education students with differing muscle fiber composition (M. vastus lateralis) were used as subjects to perform maximal vertical jumps on the force-platform. Two kinds of jumps were performed: one from a static starting position (SJ), the other with a preliminary counter-movement (CMJ). The calculated mechanical parameters included height of rise of center of gravity (h), average force (F), net impulse (NI) and average mechanical power (W). It was observed that the percentage of fast twitch fibers was significantly related (p less t…

Complement Receptor Analogous Factors in Human Serum: I. Isolation of a Molecule Inhibitory for Complement Dependent Rosette Formation, its Identific…

1979

Abstract A glycoprotein was isolated from human plasma which partially inhibited C3 carrying erythrocytes from binding to complement receptor cells (CR + C). Based on its physicochemical characteristics and its antigenicity this glycoprotein was identified as aI-antitrypsin (α 1 -AT). The activity of α 1 -AT towards-C3 and its fragments was unaffected by heating but it was destroyed by periodic acid. The isolated carbohydrate moiety of α 1 -AT showed the same effect as the intact molecule. Using F(ab) 2 of IgG-anti-α 1 -AT, α 1 -AT could be demonstrated on Raji cells and human erythrocytes. Treatment of these CR + C with IgG-anti-α 1 -AT resulted in a blockade of their C3 receptor activity.…

false

1979

Influence of molecular weight on the creep behavior of undiluted polyisobutylenes

1979

The elongational behavior in constant force experiments has been considered for three samples of commercial polyisobutylene. The results compare favorably with the predictions of two existing non-linear theories as long as the samples deform homogeneously. Some qualitative observations have been made with reference to the “failure point”, i.e., the point where a non-homogeneous deformation begins.

Differential function of the phosphoglucomutase isozymes PGM1 and PGM2

1979

A total of 13 metabolites thought to be possibly inhibitory were tested for their influence on PGM isozyme activities, each at several different concentrations. The analysis of statistical significance was based on enzyme activities obtained by densitometric measurements of starch gels. Five of the substances were found to inhibit PGM activity, three of which definitely and a further one probably led to a significantly stronger inhibition of the isozymes of the PGM2 locus than of PGM1 isozymes. They are (1) fructose-1,6-diphosphate, (2) adenosine triphosphate, (3) citrate, and (4) possibly 2,3-diphosphoglycerate. Thus, PGM1 isozymes proved to function better in hard or perhaps marginal meta…

Superheavy-element research

1979

The existence of an island of relatively stable elements beyond the present Periodic Table has been predicted by theoretical extrapolations of nuclear properties. During the past 12 years vigorous efforts have been made to discover these superheavy elements in nature and to produce them by nuclear reactions.

Measurement of the velocity and attenuation of fourth sound in helium II

1979

The velocity and the attenuation of fourth sound have been measured in liquid helium at temperatures between 0.8 K and the λ point, along the vapor pressure curve. The measurements were made using the resonance technique and the helium was contained between small pores in packed powder specimens. From the velocity, it could be determined that the sound propagates under “adiabatic” conditions. According to theory, the attenuation of fourth sound consists of two contributions: surface losses due to heat exchange with the resonator body and volume losses due to dissipative processes associated with the viscosity coefficients η and ζ3. The results of our attenuation measurements are in agreemen…

Eine oligomeranaloge friessche umlagerung oligomerer 2-acetoxy-1,3-phenylenmethylene

1979

α-Hydro-ω-hydroxypoly(5-chloro-2-hydroxy-1,3-phenylenemethylene)s (1a, b), the oligomeric condensation products from 4-chloro-2,6-bis(hydroxymethyl)phenol and 4-chlorophenol with hydrochloric acid in 1,4-dioxane, could be completely dehalogenated at room temperature and atmospheric pressure with hydrogene/Raney-Ni. The resulting oligomers 2a, b were esterified with acetic anhydride, and the esters 3a, b were subjected to a oligomer analogous Fries rearrangement to form the linear α-hydro-ω-hydroxypoly(5-acetyl-2-hydroxy-1,3-phenylenemethylene)s 4a and 4b. The characterization of the products was mainly done by spectroscopic methods.

Effects of hydrocortisone on binding of IgG or C3b-coated erythrocytes to human monocytes and polymorphonuclear leucocytes.

1979

Aktuelle Pathologie der Glomerulonephritis

1979

Ausgehend von der Glomerulonephritis-Lehre von Volhard und Fahr (1914) und den grundlegenden pathologisch-anatomischen Untersuchungen zu diesem Thema von Theodor Fahr (1925, 1934) wird der aktuelle Stand der Glomerulonephritis-Problematik dargestellt. Die — z.T. methodisch bedingten — Fortschritte besonders der Nephropathologie und der Immunnephrologie haben dazu gefuhrt, das die sachgerechte Charakterisierung eines glomerulonephritischen Krankheitsbildes heute nur durch die Synopse der drei Kategorien — Immunpathogennese, Pathomorphologie und Klinik — moglich ist. Jede dieser Kategorien hat ihre eigene Systematik. Die Nosologie der verschiedenen GN-Formen ergibt sich aus der (konstanten od…

Lorcainide; II. Plasma concentration-effect relationship

1979

Ester-Ester Exchange Reactions of Aliphatic Polyesters

1979

Abstract The kinetics of ester-ester exchange reactions of poly(ethylene adipate) and poly(trimethylene adipate) at 312°C and in the absence of a solvent and catalysts has been reported previously. Independent investigations of the thermal degradation reactions of these polyesters under high vacuum have shown that pyrolysis already starts above 270°C. An ester-ester exchange mechanism via a reversible thermal degradation reaction is proposed.

N-trifluoracetyl-nylon 66 als polymeres reagenz

1979

N-Trifluoroacetyl-Nylon 66 (2) obtained by the reaction of Nylon 66 (1) with trifluoroacetic anhydride is very suitable as a polymeric reagent for the trifluoroacetylation of amines and alcohols. The advantages of 2 compared with low molecular trifluoroacetylating reagents are discussed. The selectivity against different substituted anilines and against structurally isomeric secondary amines was studied intensively by kinetic measurements.

Separation studies of amino acids, proteins and enzymes on bonded 1,2-dihydroxy-, 1,2-hydroxylamino-and amino silica packings

1979

1,2-dihydroxy-3-propoxypropyl (HPPS), 1-amino-2-hydroxy-3-propoxypropyl (AHPS) and 1-aminoethyl-3-aminopropyl (AEAPS) silica were synthesized by means of both a surface modification procedure (I) and a bulk modification procedure (II). Method (I) gave a surface concentration, α, of functional groups of 2–3 μmole/m2, whereas method (II) gave values up to 5 μmole/m2. Retention times, peak asymmetries and plate heights of thiamine and ascorbic acid eluted with aqueous buffer solutions ranging from pH 5.3 to 9.2 gave only a±5% variation over periods of 12 hours and more. The recoveries of selected enzymes and proteines examined under static and dynamic conditions were between 60% and 100% depen…

Lorcainide. I. Saturable presystemic elimination.

1979

Associations between atopic diseases and the polymorphic systems ABO, Kidd, Inv and red cell acid phosphatase.

1979

In 239 German patients with atopic conditions (atopic dermatitis, hay fever, allergic rhinitis, bronchial asthma, and acute urticaria) the phenotype and gene distribution of 15 genetic blood polymorphisms (ABO, MNSs, rhesus, P, Kell, Duffy, Kidd, Hp, Gc, Gm, Inv, aP, PGM1, EsD, and 6-PGD) were analyzed and compared with those in 151 selected controls (individuals clinically free of allergic conditions and without allergy in the family history). The incidence of blood group antigens A and B was somewhat higher in patients than in controls. These observations are in accordance with the results of previous studies in other populations. In addition, our observations favor the hypothesis that th…

Dracocephalum ruyschiana L. (Ļaudona)

1979

Ruiša pūķgalve, atradne: Madonas rajona Ļaudona, 2 km uz dienvidiem priežu mētrājā, stāvas nogāzes augšējā daļā. /// Northern Dragon-head, deposit: Laudon in Madona district, 2 km south in the pine moorland, in the upper part of the steep slope. /// [Attēls no LU Muzeja kolekcijas Herbarium Latvicum (RIG II); (BOT1029_8)]

Pfropfung von vinylverbindungen auf polyamide

1979

Darstellung von phenolischen verbindungen und phenol/formaldehyd-polykondensaten mit ketoxim-, aldoxim- oder 1-methyl-4-hydroxyiminomethylpyridinium-…

1979

Thirteen low molecular weight oximes were prepared: one derivative of acetophenone (1), two derivatives of benzophenone (2 and 3), two derivatives of salicylaldehyde containing two phenolic nuclei (4c and 5c), and eight compounds in which a phenol unit is substituted by a 4-hydroxyiminomethylpyridiniummethyl group (8a–f, 10c, and 11c). Besides these compounds polymeric phenol formaldehyde condensates were synthesized which contain units deriving from benzophenoneoxime (15b) or from salicylaldehyde (22b) and condensates containing 4-hydroxyiminomethylpyridiniummethyl groups (23c). A series of low molecular weight and water soluble compounds (8a–f) were proved as antidotes on mice which were …

Studies on the synthesis of heterocyclic compounds. III. Preparation of some pyrazolo[3,4-C] [1,5]benzodiazocin-10(11H)one derivatives

1979

Starting from the readly available N-melhyl-N-(1-phenyl-3-R-pyrazol-5-yl)-2-nitrobenzamides (1a,b), the pyrazoles, 4-aeetyl substituted 2a,b, were prepared in high yield. Reduction of 2a gave the amino derivative 4a, which was eyclized to the desired pyrazolo[3,4-c][1,5]benzodiazo-cin-10(11H)one (5a). Compound 2b afforded 5b directly. Compound 5b was also prepared by the action of phosphorus oxychloride on N-methyl-N-(1,3-diphenylpyrazol-5-yl)-2-acetamido-benzamide (6b).