showing 36 of ~574560 from 574555 documents
Yeast Cell Wall Glycoproteins
1991
In higher cells, glycoproteins play a variety of functions as surface receptors, cell-cell mediators, carriers of enzyme activities, components of the extracellular matrix, etc. In most glycoproteins, the protein moiety will be the functional part whereas the carbohydrate moiety would contribute to the attainment of an adequate tertiary structure, modify the glycoprotein molecule making it more resistant to degradation, and facilitate its secretion.
Knowledge-Based Systems and F.E. Simulations in Metal-Forming Processes Design An integrated Approach
1991
Summary The automatic computer aided planning and design of cold forming processes includes several phases, among which the most important are the optimal choice of the forming operations sequence and, for each operation, the determination of the more suitable operating parameters. With this aim the Authors propose an integrated approach based on the preliminary choice of some feasible forming sequences, carried out by means of a knowledge-based system, and on the subsequent determination of the optimal one employing a finite element simulation of the process.
Formation et compétitivité des régions européennes
1991
Parc technologique, industrie pilote,... dans la logique de l'aménagement du territoire, l'accent semble de plus en plus mis sur la dotation en ressources humaines d'une zone géographique. Comme, d'autre part, la capacité à exporter conditionne l'essentiel des possibilités de croissance économique, on peut s'interroger sur l'impact d'une forte dotation en capital humain comme avantage absolu des produits sur les marchés extérieurs. Dans une recherche par l'entreprise de source de compétitivité, la localisation dans une région à haut niveau de formation de la main d'oeuvre peut être une stratégie a priori pertinente. Dans ce texte, on tente de donner une explication des performances d'une ré…
Un formulari de juristes.
1991
El Formulari de juristes és un recull manuscrit de fórmules judicials confeccionat i usat al segle XVII per a la redacció dels documents que havien de presentar-se davant la cort del justícia (civil i criminal) i de la reial Audiència de València. És un conjunt heterogeni de models d’actes jurídics que servia de manual per a l’ús dels pràctics del dret: jutges, advocats, notaris...
El Hospital General de Valencia en el siglo XVII (1600-1700)
1991
Exequias de Felipe IV en Nápoles: la exaltación dinástica a través de un programa astrológico
1991
LA BELLEZA DE LOS LIBROS DE EXEQUIAS ITALIANOS DEL PERIODO BARROCO ES BIEN CONOCIDA. BUEN EXPONENTE DE ELLO ES LA CRONICA ILUSTRADA DE LAS HONRAS FUNEBRES NAPOLITANAS DE FELIPE IV. TEXTO E IMAGENES REVELAN UNO DE LOS MAS IMPRESIONANTES PROYECTOS EFIMEROS DEL SIGLO XVII, EN EL QUE SE DESARROLLA UN PROGRAMA ASTROLOGICO CUYA BASE IDEOLOGICA ES LA EXALTACION DE LA CASA DE AUSTRIA, A TRAVES DE EMBLEMAS Y ALEGORIAS. (A. B.C./ L.A.G.)
AES and CEMS analysis of the formation of layers on Si steel under thermal treatment in a flux of H2/water vapour
1991
The near surface diffusion and reaction processes in iron-silicon steel (3.1 wt.%Si) during 10 min decarburization in water vapour/hydrogen have been studied. The decarburization temperature has been varied between 506 and 714°C for the fixed partial pressure ratio pH2O/pH2=0.017. An outer layer of SiO2 forms on the surface with its thickness increasing with temperature. From 600°C upwards, the decarburization process is hindered and a cementite layer is formed below the SiO2 layer. The formation of fayalite at the surface has been studied at a fixed decarburization temperature with pH2O/pH2 ranging from 0.017 to 0.49. The scale thickness reduces abruptly just before the ratio pH2O/pH2 nece…
The fischer indole synthesis of 8-methyl-5-substituted-1-oxo-β-carbolines: A remarkable high yield of a [1,2]-methyl migration.
1991
Abstract A very unusual high yield of rearranged products (via methyl migration) has been obtained in the Fischer indole cyclization of the 3-(2,5-dimethyl phenylhydrazone) of 2,3-piperidine dione (6b). When a less activated aromatic ring is present in the phenylhydrazone 6, such a behaviour is not observed and cyclization occurs essentially without rearrangement.
Lipids, Lipoproteins and Apolipoproteins A<sub>I</sub> A<sub>II</sub>, B, C<sub>II</sub>, C<sub>III</sub…
1991
In this study lipid and apolipoprotein patterns were investigated at birth and compared with those of adults. In cord sera, cholesterol, triglycerides, low-density lipoprotein (LDL) cholesterol and high-density lipoprotein (HDL) cholesterol were 38.2, 46.2, 50.5, and 31.9%, respectively, of adult values. Apolipoprotein A<sub>II</sub>, B and C<sub>III</sub> were 48.6, 30.6 and 44.5% of adult values, while apo A<sub>I</sub>, apo C<sub>II</sub> and apo E showed values approaching those of adults (63.4, 73.3 and 89.7%, respectively). Also cholesterol/HDL cholesterol and LDL cholesterol/HDL cholesterol ratios were lower in newborns. In cord sera, l…
Mechanisms of resistance to autoimmune disease induced by T-cell vaccination.
1991
Many human autoimmune diseases tend to progress slowly. Phases of rapid progression may come to a halt and may be followed by transient or even permanent remissions. Autoimmune diseases in animals either arise spontaneously or are induced. The former tend to be slowly progressive, the latter mostly acute to subacute, and usually followed by spontaneous remissions. The mechanisms at work that prevent rapid disease progression and can effect remissions are poorly understood, but they may provide us with a clue both to natural self-tolerance and to the therapeutic induction of self-tolerance.
Un Quincunx trobat a L'Alcúdia (València)
1991
Gibberellic acid stimulates lipid metabolism in barley aleurone protoplasts
1991
Abstract Changes in the lipid composition of barley aleurone protoplasts following incubation in the presence or absence of gibberellic acid (GA) were studied and correlated with cell development. Analysis of neutral lipids in protoplast extracts and purified lipid bodies provide evidence for the strong effect of GA on the mobilization of storage lipids. In vivo protoplast staining with the membrane marker N -phenyl-l-naphthylamine (NPN) and phospholipid determinations of protoplast extracts show an increase in membrane lipids during protoplast incubation. GA stimulates phospholipid metabolism by increasing the synthesis of phosphatidyl ethanolamine and phosphatidyl choline, the major phosp…
Order and Chaos in the Statistical Mechanics of the Integrable Models in 1+1 Dimensions
1991
This paper was presented at the meeting under this title. But, originally, the more cumbersome ‘Quantum chaos — classical chaos in k-space: thermodynamic limits for the sine-Gordon models’ was proposed. Certainly this covers more technically the content of this paper.
Simultaneous enzymatic determination of l(−) malic acid and l(+) lactic acid in wine by flow injection analysis
1991
Abstract A simultaneous determination of two organic acid species in wine by a flow injection analysis method using enzyme-immobilized open tubular reactors is described. The design of the optimal geometry of the FIA system is especially important to avoid the matrix fluorescence. Reproducible results were obtained in the determination of l (−) malic acid and l (+) lactic acid using l -MDH and l -LDH, respectively. The assay reactions utilize the fluorimetric determination of a common product, NADH. The sample was dialyzed on line and injected into the FIA-system. The system responds linearly (log-log calibration graphs) to the injected sample (80 μl) in concentrations ranging from 0·1 m m …
Thermostability of polymeric langmuir-blodgett films
1991
Antiasthmatic Effects of <i>Picrorhiza kurroa</i>: Androsin Prevents Allergen- and PAF-induced Bronchial Obstruction in Guinea Pigs
1991
In the Ayurvedic medicine, <i>Picrorhiza kurroa </i>Royle ex Benth. is used for the treatment of liver and lung diseases. Using different chemical and pharmacological methods, we could identify the phenol glycoside androsin as active compound preventing allergen and platelet-activating factor induced bronchial obstruction in guinea pigs in vivo (10 mg/kg p.o.; 1 h prior to the inhalation challenge). Histamine release from human polymorphonuclear leukocytes in vitro was inhibited by other compounds yet to be identified.
The electrophysiology of adenosine in the mammalian central nervous system
1991
Sympozja w pięćdziesięciolecie śmierci ks. Emila Szramka : Opole 9 grudnia 1991 roku
1991
Mistretta. Itinerario storico-artistico
1991
Un capitel corintio del Museo de Játiva
1991
Troballa d'una inscripció al santuari de la Muntanya de Santa Bàrbara. Notes sobre l'arqueologia urbana de la Vilavella
1991
Inscripció trobada per J. A. Vicent al desembre de 1990, en un ribàs situat a uns 100 m. del santuari de la Muntanya de Santa Bàrbara. Actualment dipositada al Museu Històrie de Nules.
Study of the interaction between [Cu(bipy)]2+ and oxalate in dimethyl sulfoxide. Crystal structure of [Cu2(bipy)2(H2O)2ox]SO4·[Cu(bipy)ox]
1991
Abstract A study of complex formation between [Cu(bipy)]2+ and ox2− (bipy and ox2− being 2,2′-bipyridyl and the dianion of oxalic acid), has been carried out by potentiometry in dimethyl sulfoxide solution. The constants of the equilibria and are log β110 = 11.165(1) and log β210 = 13.185(5) at 25 °C and 0.1 mol dm−3 tetra-n- butylammonium perchlorate. The high values of these constants are consistent with the symmetrical bidentate and bis-bidentate modes of oxalate in [Cu(bipy)ox] and [Cu2(bipy)2ox]2+ units, respectively, as shown by X-ray diffraction studies. Well-formed single crystals of [Cu2(bipy)2(H2O)2ox]SO4· [Cu(bipy)ox] were grown from aqueous solutions and characterized by X-ray d…
Droloxifene-Induced Spikes of Tumor Markers Predict Benefit of Therapy
1991
In the clinical monitoring of cancer, tumor marker proteins may reflect the status of the disease. In cases with radio- and chemotherapy, spikes of tumor markers were found shortly after starting the therapy. These spikes were interpreted as a sign of tumor lysis. Recently during therapy of breast cancer with the new antiestrogen droloxifene, spikes of CA 125 and CA 15-3 were also found in about one-third of patients responding to therapy. The peaks of these initial increases were recorded between 14 and 60 days after the onset of treatment, with maximum concentrations up to 1,890% of the initial value. Marker concentrations decreased thereafter, to new baselines at or below the initial val…
Cleckleyn psykopaatin muotokuva haastatteluvastausten valossa
1991
The core characteristics of the Cleckley psychopath are superficial charm, good intelligence, absence of neurotic and psychotic symptoms, unreliability, pathological lying, inadequately motivated antisocial behavior, affective poverty and failure to follow any life plan. This study aimed at introducing both Cleckley's description of psychopathy and the Psychopathy Checklist developed by Hare for the assessment of psychopathy. A sample of 92 inmates, convicted mainly of property, narcotics· and traffic offenses, was assessed using the Psychopathy Checklist that was completed on the basis of an interview and file data. In addition, the inmates filled in personality questionnaires. Hereafter, …
Girolamo Arrigo: Intervista, Saggio bibliografico, Catalogo delle opere e Bibliografia generale
1991
Il testo si costituisce di verie sezioni, che compongono una sorta di ritratto di Girolamo Arrigo, con particolare riguardo al catalogo delle opere e al repertorio bibliografico.
Programme de recherche sur le mont Beuvray, rapport annuel 1991
1991
Ce rapport rend compte des travaux effectués au cours de l'année 1991 dans le cadre du programme de recherche sur le mont Beuvray sous la direction scientifique de Bibracte (Jean-Loup Flouest, coordonnateur scientifique).
La biblioteca depositaria de las Naciones Unidas en la Facultad de Derecho de Valencia
1991
LA BIBLIOTECA DEPOSITARIA DE LAS NACIONES UNIDAS DE LA FACULTAD DE DERECHO ES UNA DE LAS CUATRO EXISTENTES EN ESPAÑA, ES DE "DEPOSITO GENERAL", SEGUN TERMINOLOGIA DE LAS NACIONES UNIDAS, Y TANTO LA DOCUMENTACION PROPIA DEL ORGANISMO COMO LAS DIFERENTES PUBLICACIONES SE RECIBEN EN ESPAÑOL, INGLES Y FRANCES. EN ESTE TRABAJO SE PRESENTA ESTA BIBLIOTECA CON UNA PEQUEÑA DESCRIPCION DE LA DOCUMENTACION, DIVERSAS COMISIONES, LAS CATEGORIAS EXISTENTE EN PUBLICACIONES Y UN LISTADO DE REVISTAS, DE LAS QUE SE SEÑALA TITULO, PERIODICIDAD, ISSN Y FONDOS
Report of a european collaborative exercise comparing DNA typing results using a single locus VNTR probe
1991
A collaborative exercise was carried out in 1989 among 12 European forensic laboratories using the single locus VNTR probe pYNH24, the restriction enzyme HinfI, the same set of human genomic DNA samples, and a standardized DNA size marker. The objectives of the exercise were: (1) to study the degree of variation within and between laboratories, (2) to obtain information on requirements for technical standardization allowing the exchange of typing results and (3) to compare different approaches for the identification of allelic DNA fragments of unknown size. Each laboratory carried out up to 10 independent typing experiments using the same DNA samples. The results were analysed independently…
Backfiring of the isolated rat phrenic nerve does not collide with impulse propagation following repetitive nerve stimulation at 1-50 Hz.
1991
Acetylcholinesterase inhibition with neostigmine in the isolated rat phrenic nerve-hemidiaphragm preparation induced axonal backfiring and repetitive compound muscle action potentials following single nerve stimulation. The duration of backfiring and the repetitive compound muscle action potentials did not exceed 55 ms. With repetitive nerve stimulation at frequencies ranging from 1 to 50 Hz, backfiring was present only with the first stimulus and the amplitude of the second compound muscle action potential was maximally reduced, while the subsequent responses recovered gradually. However, the amplitudes of the concommitant antidromic nerve action potentials remained unchanged during the en…
Pablo Serrano ou l’espace essentiel
1991
Se trata del texto mecanografiado por el propio autor, aunque se correponde con la versión publicada en: Conseil de l'Europe. Exposition anthologique. Pablo Serrano (1908-1985). Conseil de l'Europe. Strasbourg. Zaragoza: Fundación Pablo Serrano.
Modes of Structure Formation in Doped Discotic Polymers and Low Molar Mass Model Systems
1991
By doping low molar mass or polymeric liquid crystals containing flat disc-like units with electron acceptors one achieves a stabilization of columnar phases, the induction of a columnar phases in otherwise discotic nematic or even in amorphous systems. Theoretical models based on the assumption of strong electron donator-acceptor (EDA) complex formation are able to account for the structure formation on a molecular level and the thermodynamic properties of the mixtures and the model of diffusion limited aggregation (DLA) for the structure formation on a supermolecular structure.
Analysis of singular bilinear systems using Walsh functions
1991
The use of Walsh functions to analyse singular bilinear systems is investigated. It is shown that the nonlinear implicit differential system equation may be converted to a set of linear algebraic Lyapunov equations to be solved iteratively for the coefficients of the semistate x(t) in terms of the Walsh basis functions. Solution of the iterative algorithm is uniformly convergent to the exact solution of the algebraic generalised Lyapunov equation of the singular bilinear system. The present method is slightly more complicated than a similar one arising from the analysis of linear singular systems. In fact, it is a hybrid between the analyses of usual linear singular and bilinear regular sys…
Avaluació del procés de formació, gestió i funcionament dels primers consells escolars dels centrs publics de la Comunitat Valenciana
1991
Resumen de los resultados cuantitativos y cualitativos del primer informe sobre el funcionamiento de los consejos escolares en la Comunidad Valenciana
Therapieergebnisse der radikalen Zystektomie mit und ohne adjuvante oder induktive M-VAC-Behandlung
1991
Die Entfernung der Harnblase mit gleichzeitiger Anlage einer Harnableitung galt bis vor wenigen Jahren als eine der riskantesten Operationen. Die operative und postoperative Mortalitat des Eingriffs lag auch in groseren Zentren vor 20 Jahren noch bei etwa 20 %. Das hohe Operationsrisiko fuhrte dazu, das die Indikation zur Zystektomie in der Regel erst bei weit fortgeschrittenen Tumorstadien gestellt wurde. Dadurch wurden die Operationen technisch noch schwieriger und die Langzeitergebnisse in der Regel schlecht. Zudem fuhrten die Spatkomplikationen der Harnableitung sowie die technischen Versorgungsprobleme haufig zu einer erheblichen Einschrankung der Lebensqualitat bei den betroffenen Pat…
Wpływ tlenku glinu jako nośnika katalizatora tytanowo-glinowego, na aktywność tego katalizatora w polimeryzacji etylenu
1991
The chemical and physical character of A120 3 surface was modified with halogen-containing compounds and by subsequent calcination at 773–1373 K. An increase of the acidic character of the carrier (modification with HC1) has an activating effect on the catalytic properties of the surface complex of Ti in ethylene polymerization. On the other side, the interaction of basic centres (modification with NaCl or NaF), by inductive effects on the titanium active centres, reduces their ability to coordinate olefin; this results in a reduction of the catalytic activity. It was found that both a modification with HC1 and heating of the carrier at temperatures above 773 К results in a change of the ph…