Deviations from equilibrium at the interface of a charged membrane

1989

The local equilibrium assumption commonly employed for the transport through the interface of a charged membrane has been analysed from a simplified electric double layer model. This layer is characterized on the basis of a surface potential arising from a non-zero surface charge density placed on the membrane surface. The dependence of deviations from local equilibrium on the characteristic parameters of the problem is shown. Connection with the classical treatment by Donnan is discussed. Although the complexity of the problem calls for a number of simplifications, the results obtained appears to be significative. Thus, the analysis carried out displays not only that deviations from equili…

Polymer support synthesis

1989

Non-porous silica gel microbeads of diameter 1.5 microns have been investigated as supports for oligonucleotide synthesis. In the preparation of oligothymidylates of chain length up to 150 bases, with 5'-di-p-anisylphenylmethyl-3'-phosphoramidite as an intermediate, the average yields per chain elongation were up to 99%. Lower overall yields were observed in the case of a support which developed a strong tendency towards aggregation after the build up of an oligonucleotide coating.

Immunotherapy of Malignant Melanomas

1989

A large number of antigens on human melanoma cells have been identified by means of monoclonal antibody technology [18, 21]. The availability of monoclonal antibodies has rapidly led to clinical investigations. Experience with monoclonal antibodies in the treatment of patients with melanoma is limited [4, 9, 10, 12, 13, 17, 19] because only small groups of patients have been treated so far. According to these studies, treatment with ganglioside antibodies appears most promising.

A parallel FE-splitting up method to parabolic problems

1989

Prótesis Rotatoria de Rodilla

1989

Los autores revisan 60 gonartrosis operadas mediante prótesis intracondilar con posibilidad de rotación, describiendo la técnica quirúrgica y exponiendo sus resultados y las conclusiones obtenidas. Estos pacientes han sido intervenidos en el Hospital Insular de Las Palmas de Gran Canaria, en el período comprendido entre 1978 a 1985.

Supercritical fluid extraction of pesticides

1989

The extraction behaviour of 10 μg samples of five pesticides and some related compounds from glass wool with supercritical CO2 has been investigated under several conditions (10 MPa, 20 MPa extraction pressure, 313 K, dry and water saturated CO2). The extraction fluid was decompressed over a line of little columns, filled with 3μ Si60 or RP18, and the amount of deposited material was analyzed by HPLC for each of these columns. Due to the progressive pressure/density reduction along the line, the solubility diminishes and hence the compounds are deposited according to their polarity/vapor pressure earlier or later on the line. Thus extraction and prefractionation of compounds of different po…

Succession des faunes d'Ammonites du Sinémurien supérieurdans le Chablais méridional et les Klippes de Savoie (Préalpes Médianes, Haute-Savoie, Franc…

1989

Resume L'etude biostratigraphique et paleontologique des faunesd'ammonites du Sinemurien superieur et du Carixien basal dans le Chablais meridional (series reduites) et les Klippes de Savoie (series dilatees) permet de reconnaitre 9 horizons biostratigraphiques aisement correlables avec la zonation standard de l'Europe moyenne. Par leur contenu faunique les coupes etudiees sont tres proches de celles de la partie septentrionale des Prealpes medianes (Langenegggrat, region de Thoune, Suisse). En outre, les sequences reduites du Chablais presentent de remarquables analogies lithologiques avec celle du Langenegggrat. En termes paleobiogeographiques les faunes subbrianconnaises des Prealpes med…

The Boson Fermion Correspondence

1989

In 1932 Louis de Broglie suggested that photons could be constructed from pairs of neutrinos [de Broglie, 1932]. Both are massless particles (except for some recent unconfirmed experiments according to which the neutrino could have a very small mass) and are electrically neutral. The main difference between free photons and free neutrinos is that the former obeys Bose statistics and the second Fermi statistics. The spin of a photon is 1 and the spin of a neutrino is 1/2 and therefore kinematically it should be possible to think of a photon as a neutrino pair. However, this old formulation of boson fermion equivalence has not been very fruitful in particle physics. Instead, there has been a …

Matter Effects in Neutrino Propagation

1989

After briefly reviewing the Mikheyev-Smirnov-Wolfenstein effect, I present a particle physics model where the required small neutrino mass arises from spontaneous R parity violation in supergravity theories. It is related to measurable processes associated with the existence of the Majoron and of supersymmetric (SUSY) particles. Astrophysical and laboratory limits tend to exclude regions of oscillation parameters where the high energy neutrinos are adiabatically converted. This suggests the possibility of a large reduction in the pp and 7 Be neutrino flux even for a mildly reduced 8 B neutrino flux, thus stressing the importance of the gallium experiments. Finally I consider other types of …

Estudio estadístico-epidemiológico de las fracturas diafisarias de fémur a lo largo de 10 años

1989

Se realiza un estudio epidemiológico de 306 pacientes con fractura diafisaria de fémur que hemos atendido entre 1977 y 1986, refiriendo en los resultados finales únicamente los 228 casos en que se hizo un seguimiento completo. Los accidentes de tráfico han sido la principal causa de lesión, 76'8%, siendo la mayor incidencia en los varones de 15-25 años. Las fracturas abiertas supusieron el 14 '7% y únicamente hubo un 3 '7% de afectaciones vasculonerviosas. Se efectuó tratamiento quirúrgico en el 70% de los casos, tratamiento incruento en 20'5% y en el 9'5% restante no se realizó ningún tratamiento definiúvo por trasladarse a otro centro. En los enclavados endomedulares se permite el apoyo a…

Enunciats disposicionals i explicacions nomològiues en les ciències socials

1989

En aquest article, discutesc el model de Hempel a 'The Function of General Laws in History', on defensa que, en contra del que es pretenia des de certes postures més o menys idealistes, les lleis generals complien el mateix paper en l'explicació dels fenòmens històrics que en l'explicació dels fenòmens naturals.

Endoluminal ultrasonic examination of sessile polyps and early carcinomas of the rectum

1989

The results of conventional endosonographic techniques in the assessment of early carcinomas and sessile polyps of the rectum have been unsatisfactory. We therefore developed a new technique in which the rectal cavity is filled directly with water. Using this technique, the anatomy of small rectal tumors is preserved and the layers of the rectal wall are easier to differentiate, especially with a 10-MHz scanner. The clinical results in 66 patients demonstrate that this new technique is very accurate in the preoperative staging of adenomas and T1-carcinomas of the rectum.

k-epsilon Predictions of Heat Transfer in Turbulent Recirculating Flows Using an Improved Wall Treatment

1989

Odour profiling of the components of apricot flavour description by correspondence analysis

1989

HEURISTIC PROCEDURES FOR GROUP SCHEDULING

1989

ABSTRACT The group scheduling problem is investigated, solving numerous small and large sized examples with eight sequencing algorithms. A new approach, basically consisting in the definition of real machines' idles for each group, utilizing allowed shifting of non critical activities, is proposed. Moreover the CDS multi-shot algorithm is extended to group scheduling.

Hacia una definición del término humanismo

1989

Selection and classification of volatile compounds of apricot using RV coefficient

1989

International audience

Hyperoxic Intubation Apnoea: An In Vivo Model for the Proof of the Christiansen-Douglas-Haldane Effect

1989

The Christiansen-Douglas-Haldane effect (HALDANE effect) describes the different CO2 binding capacity of haemoglobin on its degree of oxygenation and was first demonstrated in vitro in 1914 (Christiansen, Douglas and Haldane, 1914).

Growth-related changes of oxygen consumption rates of tumor cells grown in vitro and in vivo

1989

Growth-related changes of oxygen consumption rates of tumor cells, grown in vitro or in vivo, were investigated. For in vitro investigations, L929 and DS-carcinosarcoma cells were cultured in artificial media. For in vivo studies, DS-carcinosarcoma cells were implanted into the abdominal cavity of Sprague-Dawley rats (ascites tumor, containing malignant cells, leukocytes, lymphocytes, and macrophages). Oxygen uptake was measured photometrically. Parameters of the extracellular medium judged to possibly influence the respiratory activity of tumor cells were monitored at different growth stages (glucose, lactate, and amino acid levels, oxygen and carbon dioxide partial pressures, and pH value…

Latvijas Valsts universitātes profesori jubilejas gadā: biobibliogrāfiskais rādītājs

1989

Biobibliogrāfiskajā rādītājā ietvertas LVU profesoru biogrāfijas un doti profesoru zinātnisko darbu publikāciju saraksti. Darbs veltīts universitātes septiņdesmit gadu atcerei.

Pseudoboethiana

1989

Necrosis Cefálica femoral: abuso de alcohol

1989

El alcoholismo es la primera causa de morbilidad en el mundo, siendo un problema importante para la salud pública. Así pues, el abuso del alcohol aparece relacionado con un gran número de patologías, llevando a los enfermos que las padecen a sufrir una mala evolución de su enfermedad y a complicaciones inesperadas. Dentro de estas patologías se encuentra la Necrosis Cefálica Femoral (NCF) y con el fin de valorar esta mala evolución y sus consecuencias, hemos estudiado 25 pacientes afectos de dicha enfermedad analizando en ellos su hábito alcohólico, días de estancia hospitalaria y complicaciones, realizándoseles exploraciones analíticas tales como aspartato amínotransferasa, volumen corpusc…

Rapid Plasmid Isolation. A Laboratory Experiment for Intermediate and Advanced Students

1989

Genes of Secondary Metabolism: Differential Expression in Plants and In Vitro Cultures and Functional Expression in Genetically Transformed Microorga…

1989

Plants had to develop strategies for defence against microorganisms and herbivores during evolution. The evolution of chemical defence, i.e. the production of the so-called secondary products can be regarded as one of the most important means in this context (Swain 1977, Rosenthal and Janzen 1979, Wink 1988). Since secondary metabolites evolved as biologically active compounds, it is not surprising that man has found a use for many of them, e.g. as medicinal agents, flavours, spices, colours, stimulants, hallucinogens, or pesticides. As a consequence, quite a number of secondary plant products are of economical importance.

The Kp Hierarchy

1989

As an application of the theory of infinite-dimensional Grassmannians and the representation theory of gl1 we shall study in this chapter certain nonlinear “exactly solvable” systems of differential equations. Exactly solvable means here that the nonlinear system can be transformed to an (infinite-dimensional) linear problem. A prototype of the equations is the Korteweg-de Vries equation $$\frac{{\partial u}}{{\partial t}} = \frac{3}{3}u\frac{{\partial u}}{{\partial x}} + \frac{1}{4}\frac{{{\partial ^3}u}}{{\partial {x^3}}}$$ . It turns out that it is more natural to consider an infinite system of equations like that above, for obtaining explicit solutions. The set of equations is called th…

Age- and training-related changes in the collagen metabolism of rat skeletal muscle

1989

The effects of ageing and life-long endurance training on the collagen metabolism of skeletal muscle were evaluated in a longitudinal study. Wistar rats performed treadmill running 5 days a week for 2 years. The activities of collagen biosynthesis enzymes, prolyl-4-hydroxylase and galactosylhydroxylysyl glucosyltransferase, were highest in the muscles of the youngest animals, decreased up to the age of 2 months and from then on remained virtually unchanged. The enzyme activity in young animals was higher in the slow collagenous soleus muscle than in the rectus femoris muscle. The enzyme activity in the soleus muscle was higher for older trained rats than older untrained rats. The relative p…

Les inégalités sociales à l'école : tout n'est pas "joué" à l'école primaire

1989

International audience

Anestesia Epidural en la Espondiloartritis Anquilosante

1989

The authors present two cases of anquilosating spondyloarthritis subjected to total bilateral hip arthroplasty involving the epidural anesthesic technique. This method, shown to be of use in orthopedic surgery, was also found to be appicable in Bechterew's disease.

Decompositions of meromorphic Fredholm resolvents and ?*

1989

Síndrome de la Arcada de Froshe Espontáneo : (aportación de un caso)

1989

Se presenta un caso de síndrome de la arcada de Froshe espontáneo (atrapamiento interóseo del nervio radial), resaltando su poca frecuencia, clínica específicamente motora, su relación con movimientos repetidos de pronosupinción y arcada fibrosa, la necesidad del diagnóstico electromicrográfico y proponiendo un tratamiento quirúrgico ampliamente descompresivo.

Weak Mixing, CP Violation and Rare Decays

1989

This review summarizes experimental information on weak couplings of quark flavours from weak decays and weak production of heavy flavours and the relation of the observed direct CP violation to a non-trivial phase in the quark mixing matrix. The interest in this field is twofold: on the one side, we can measure precisely the parameters of the standard model in its own framework; on the other side, any inconsistency amongst these measurements or evidence for any process forbidden in the standard model will lead beyond that model.

Prótesis total de cadera de charnley de más de 10 años de evolución

1989

En el presente trabajo se estudian los resultados de los implantes de Prótesis totales de Cadera tipo Charnlcy (PTCCh) realizados en el Hospital "San Agustín" de Avilés (Asturias) durante los años 1976 y 1977. Tiene por lo tanto un seguimiento de más de 10 años. Todas ellas son del mismo modelo y se valoran sus resultados bajo los mismos parámetros de Merle D' Aubigne y Postel (la impresión del paciente se evalua según IIuggler) Los resultados son generalmente satisfactorios, aunque se han presentado complicaciones y alguna de ellas precisó revisión. Se discuten las complicaciones acaecidas y la experiencia comparativa con otros autores. In the prescnt work it is studied the hnplantation of…

Efectos cerebrovasculares de los fármacos bloqueadores de la entrada de Ca2+

1989

Extensions of Groups of Gauge Transformations

1989

In this chapter we shall discuss the structure of the infinite-dimensional Lie groups associated to the affine Kac-Moody algebras. We shall also construct the group of the current algebra of a gauge field theory in 3+1 space-time dimensions and we shall study the implications of the commutation relations for the spin-statistics relation in 3+1 dimensions.

Un vigneron "moyen" vu par lui-même au 18e siècle

1989

Learning and remembering the environment in the blind cave fishAnoptichthys jordani

1989

1. The swimming behavior of blind cave fish (Anoptichthys jordani) differs in familiar and unfamiliar surroundings. Following release in unfamiliar surroundings, or after alterations of a familiar environment, the fish increase swimming velocity in order to optimize lateral line organ stimulation. Furthermore, they glide along boundary features more often than they do in familiar surroundings. These characteristics of swimming behavior were used to measure the occurrence and duration of exploratory behavior. 2. Fish removed from a familiar environment for as long as 2 days spend less time exploring when returned than when they were initially placed in the environment. After a longer absence…