Structure variation in styrene‐divinylbenzene copolymers and its influence on sorption properties

1981

The effect of a series of solvents on the structure of solvent‐modified styrene‐divinylbenzene copolymers has been investigated. It has been found that by a consecutive treatment of these copolymers with toluene, acetone, methanol, and water marked changes can be brought about in the structure of these copolymers which lead to the formation of, or increase in, their specific surface area. This phenomenon was explained by the disintegration of large aggregates into smaller ones and the parallel formation of a larger number of small pores. Such a treatment enhances the sorption properties of the copolymers.

RNA containing intracellular particles in cytoplasmic male sterile Faba bean.

1981

International audience

On the convergence of the finite element approximation of eigenfrequencies and eigenvectors to Maxwell's boundary value problem

1981

CP violation in decay rates of charged bottom mesons

1981

In the standard theory we discuss a mechanism of interference between two different tree-level charged current amplitudes to induce CP violation. The asymmetry between conjugate Cabibbo disfavoured modes of charged bottom meson decays is considered. Estimates for two-body decays ofB u andB c are presented. We find thatB u − →D −+D 0 * , for instance, can give a big CP asymmetry with values ≈1–50%, depending on the angle and phase parameters.

La formation continue des jeunes : contenu et impact

1981

Massenspektrometrische Untersuchungen an 4-[(2-Amino-ethylmercapto)-methyl]-imidazolen

1981

Es wurden 7 unterschiedlich substituierte 4-[(2-Amino-ethylmercapto)-methyl]-imidazole unter den Bedingungen der Elektronenstosionisation massenspektrometrisch untersucht. Unter Berucksichtigung der charakteristischen Verhaltensweisen dieser Stoffgruppe wird ein Schema der Hauptfragmentierungswege vorgeschlagen. Mass Spectrometry of 4-[(2-Aminoethylthiomethyl]imidazoles 7 substituted 4-[(2-aminoethylthio)methyl]imidazoles were investigated by electron impact mass spectrometry. The main fragmentation paths are described and the characteristic fragments are tabulated.

Complexes of organometallic compounds. L. The correlation between 119Sn mössbauer isomer shifts and calculated partial charges on tin in adducts of t…

1981

Abstract The relationship between Mossbauer isomer shifts, δ, and atomic charges on tin, QSn has been studied for homologous series RnSnhal4−n· L2 [ n = 0−3; L2 = donor atoms of 1, 2-bis(dipheylphosphino)ethane, N, N′-ethylenebes(salicylideneimine) and N, N′-ethylenbes(acetylacetoneimine)] and Snhal4· 2PR3. Semiempirical values of QSn have been calculated by two methods based on the concept of orbital electronegativity equalization upon bond formation. Linear correlations δ/QSn are obtained, which can be function of the coordination number of the metal atom, for terms of the series characterized by different orbital electronegativities of atoms directly bound to tin. Deviations occur for ad…

Correlation between relative sunshine and state of the sky

1981

Abstract It is possible to construct a sunshine map referring to a large zone, lacking in a widespread network of recording stations, correlating the relative sunshine with the “state of the sky”, defined by the monthly mean number of the clear, mixed and overcast days, whose data are more largely available. In the correlation here proposed climatological and meteorological factors are introduced in order to express the helioclimatic characteristics of every location. The application to Italy, using the data of the period 1973–1977 provided by the 31 stations of ITAV, has suggested the classification of these stations in seven “helioclimatic groups” characterized by different values of the …

Mise en évidence et étude des interactions phytochrome - liposomes chez la courge (Cucurbita pepo L.) et le blé (Triticum aestivum L.)

1981

150 ref. *INRA Dijon, Documentation, 17 rue Sully, BP 86510, 21065 Dijon cedex Diffusion du document : INRA Dijon, Documentation, 17 rue Sully, BP 86510, 21065 Dijon cedex Diplôme : Dr. d'Université

The structure of polymeric diaquo-di-μ-hydroxo-bis-μ-(nicotinato-N-oxide)-bis-μ-(nicotinato-N-oxide)tricopper(II)

1981

Abstract The new unusual polymeric copper(II) complex with nicotinate N-oxide (N-nicO), [Cu3(N-nicO)4(OH)2(H2O)2]n was prepared and its crystal and molecular structure was determined from three-dimensional X-ray diffraction data. The crystals belong to the triclinic space group P 1 (No. 2). The cell parameters are a = 7.881(9), b = 9.658(11), c = 10.368(12) A, α = 97.32(9), β = 110.38(9), γ = 109.53(9)°, V = 670(1) A3, dobs = 1.94 (dcalc = 2.02) and Z = 1. The structure was refined to a final R-value of 4.13%. The complex is a polymeric, linear chain along the c-axis, and its structure units are connected with each other through two N-oxide oxygen atoms. There are three copper atoms (Cu1, C…

La otra transición

1981

TISSUE OXYGENATION AND NORMAL AND HYPERTHERMIC CONDITIONS

1981

Publisher Summary This chapter describes the tissue oxygenation and normal and hyperthermic conditions. The knowledge of the effect of hyperthermia on tumor and normal tissue blood flow is important not only for the effect of hyperthermia on hypoxic cells at the time of radiation, but also for differential tumor heating. There is considerable evidence from plethsmography that an elevation of normal tissue temperature to 41°C is accompanied by a considerable increase in blood flow. The chapter discusses studies that were conducted to examine changes in the microenvironment of normal and tumor tissue as measured directly with ultramicroelectrodes. In situ studies were carried out in fourth ge…

Dígalo con luz

1981

Tumorhemmende Wirkstoffe, 12. Mitt. 2-Ureido-4(3H)-pyrimidinone

1981

Aus der Kondensation von Guanidincarbonsaureamid (1) mit den β-Ketocarbonsaureestern 2a–h resultieren die 2-Ureido-4(3H)-pyrimidinone 3a–h. Die Ubertragbarkeit dieser Reaktionsweise auf cyclische Ketocarbonsaureester geht aus der zu 2-Ureido-5,6,7,8-tetrahydro-4(3 H)-chinazolon (3i) fuhrenden Kondensation von 1 mit 2-Oxocyclohexancarbonsaureethylester (2i) hervor. Besonders 3h vermag turmorhemmende Effekte auszulosen. Tumor Inhibitory Agents, XII: 2-Ureido-4(3H)-pyrimidinones The condensation of guanidinecarboxylic amide (1) with the β-ketocarboxylates 2a-h leads to the 2-ureido-4(3H)-pyrimidinones 3a–h. The applicability of this reactin to cyclic ketocarboxylates is demonstrated by the con…

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1981

Album Fratrum Rigensium

1981

On the Problem of Well-Posedness for the Radon Transform

1981

In this note, we first discuss some continuity and discontinuity properties of the inverse Radon transform (R.t.). Any such property gives a positive (or negative) answer to the question, whether under certain contitions the problem of inverting the R.t. is well-posed.

La cueva de las Balsillas (Vall de Almonacid, Castelló): un yacimiento del Bronce Valenciano

1981

13C NMR, 1H NMR and IR spectra of a series of monochloroesters of aliphatic short chain carboxylic acids

1981

Abstract 13 C chemical shifts for 14 isomeric monochloroesters of aliphatic carboxylic acids from propanoic acid to hexanoic acid have been determined. Comparisons are made with the literature values for methyl monochloro-octanoate isomers. Substituent effects for all positions are given. Characteristic IR absorption bands are presented and comparisons are made with regard to the isomeric structure. Connections are suggested between observed trends in IR absorption frequencies and some “abnormal” chlorine substituent effects on 13 C chemical shifts. 1 H NMR spectra of these compounds are considered.

On the finite element approximation for maxwell’s problem in polynomial domains of the plane

1981

The time-harmonic Maxwell boundary value problem in polygonal domains of R2 is considered. The behaviour of the solution in the neighbourhood of nonregular boundary points is given and asymptotic error estimates in L2- and in curl-div-norm for a finite element approximation of the solution are derived

Klassifikation der Hirngeschwülste

1981

Im Rahmen der von Fedor Krause redigierten „Allgemeinen Chirurgie der Gehirnkrankheiten“ formulierte L. Bruns 1914, man rechne zu den Hirngeschwulsten alle innerhalb des Schadels sich ausdehnenden Neubildungen und konne sie in drei Gruppen teilen: 1. die echten Geschwulste, 2. die infektiosen Granulome, 3. die Parasiten. Der heutige Sprachgebrauch ist praziser und auf die erste der von Bruns aufgezahlten Gruppen eingeengt. Auch so ist ihr Bereich noch umfanglich genug und durchaus inhomogen. Erst eine taxonomische Ordnung der Bestandteile dieser Gruppe gibt einer zunachst regellosen Ansammlung von Beobachtungen eine Struktur, macht Befunde verschiedener Beobachter vergleichbar und eroffnet …

Compte-rendu : Stéphane Gruber-Magitot, Les conflits de coutumes en matière de contrats dans la jurisprudence des Parlements, de Dumoulin au Code civ…

1981

Compte-rendu : Stéphane Gruber-Magitot, Les conflits de coutumes en matière de contrats dans la jurisprudence des Parlements, de Dumoulin au Code civil

Classification of Intracranial Tumors

1981

L. Bruns (1914) stated in Krause’s “General Neurosurgery” that brain tumors included all neoplasms growing within the cranial cavity and that these might be divided into three groups: (1) genuine tumors, (2) granulomatous lesions, and (3) parasites. Current use of the term “brain tumor” is more precise and limited to the first of L. Bruns’ categories. Even so, brain tumors represent a large and inhomoge-neous group. The comparison and evaluation of such a diverse set of observations is only possible after making a systematic classification of pertinent data.

The Effects of Microelectrophoretically Applied Melatonin, Putative Transmitters, Thyroxine and Sex Hormones on the Electrical Activity of Pineal Cel…

1981

ABSTRACT The effects of microelectrophoretic application of melatonin, noradrenaline, acetylcholine, thyroxine, testosterone and oestrone on pineal cell electrical activity were evaluated. With the exception of acetylcholine and oestrone pineal cells showed a circadian rhythm in sensitivity to the application of the substances. It is apparent from these studies, that (1) transmitters and hormones can bring about direct changes in the firing frequency of pineal cells, (2) all pineal cells do not respond to these substances in the same way and (3) that melatonin either produced in the pineal organ or reaching the gland via the general circulation may be capable of directly influencing the cel…

Seasonal Variations on the Cortisol Concentration of the Subretinal Fluid in Rhegmatogenous Retinal Detachment

1981

Probes of the subretinal fluid were obtained from 115 nonselected retinal detachments, operated on during the period from November 19, 1973 to December 20, 1974. All patients had no known endocrine abnormalities and had not ever received topical or systemic corticosteroid therapy. Subretinal fluid Cortisol was determined by competitive protein binding analysis. A statistically significant increase in mean subretinal fluid Cortisol concentration was found for the winter season (3.3 µg/100 ml), as compared with the summer months (1.5 µg/100 ml). This finding sharply contrasts with the seasonal incidence of the idiopathic retinal detachments which reaches its maximum in the months June to Augu…

Central dislocation of the jaw-joint into the middle cranial fossa

1981

Summary The authors' case of central dislocation of the jaw-joint is used to discuss the incidence, mechanism of causation and the problems of clinical diagnosis, and the possible lines of treatment are listed. The management of the central dislocation in our case consisted of surgical reduction of the articular process by means of traction with hooked retractors over a fulcrum in the molar region.

El sector sur del AMV: Inmigración y desarrollo económico

1981

A synchronization property of pure subsemigroups of a free semigroup

1981

Datos para el estudio del endeudamiento del campesinado en Ayora (1786-1805)

1981

Les déterminants de la scolarisation en Afrique

1981

Référence interne : 81020

Amela

1981

Notions of a Finnish national identity during the period of Swedish rule

1981

‘Gli Ænigmata Laureshamensia’

1981

Délits et châtiments en Anjou au 18e siècle

1981

National audience

Carcinoma lobulillar de mama: Alteraciones microscopicas asociadas en los ductos extralobulillares. Un analisis retrospectivo de 72 casos

1981

In mammary lobular carcinoma three forms of ductular tumor extension have been described that are not strictly confined to the proper glandular lobule. These are the clear pagetoid cells adherent to the basement membrane of small ducts and by some authors seen in relation with microcalcifications. Then there are clover-shaped or saccular changes of the ducts and finally solid or papillary intraductal tumor extensions not always neatly distinguishable from mammary dysplasia. Both for theur diagnostic significance of the main lesion as for the estimation of their prognostic value, the incidence of these findings was reviewed in 72 own cases, 29 of which wewre lobular carcinomas in situ an 43 …

Las marcas de terra sigillata de Valentia

1981