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  • Mice  (113)
  • superconducting magnets  (46)
  • American Association for the Advancement of Science (AAAS)  (111)
  • Springer  (48)
  • Wiley
  • 1980-1984  (159)
  • 1925-1929
  • 1983  (159)
Collection
Keywords
Publisher
  • American Association for the Advancement of Science (AAAS)  (111)
  • Springer  (48)
  • Wiley
Years
  • 1980-1984  (159)
  • 1925-1929
Year
  • 1
    Electronic Resource
    Electronic Resource
    Genetic interpretation and analysis of diallel crosses with animals (1983)
    Springer
    Theoretical and applied genetics 65 (1983), S. 17-23 
    Details
    ISSN: 1432-2242
    Keywords: Diallel cross ; Maternal effects ; Heterosis ; Mice
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary A genetic framework was developed for the interpretation of statistical parameters estimated from a diallel experiment among a fixed set of lines. These included average direct genetic, average maternal genetic, general combining ability, reciprocal, and line and specific direct and maternal heterotic effects. The genetic model is based on direct and maternal additive and dominance genetic effects as would be expected in animal species. The model assumes that dominance is the underlying basis of heterosis. As an example, litter size at birth was analyzed from a 5 × 5 diallel cross with mice.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00276256
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  • 2
    Electronic Resource
    Electronic Resource
    Alternatives to the SQUID magnetometer for some biomagnetic measurements (1983)
    Springer
    Il nuovo cimento della Società Italiana di Fisica 2 (1983), S. 214-223 
    Details
    ISSN: 0392-6737
    Keywords: Biomagnetism (including magnetocardiography) ; PACS. 85.25 ; Superconducting devices ; superconducting magnets
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Description / Table of Contents: Riassunto Si discutono magnetometri del tipo del flussometro elettronico e di risonanza (precisione libera, pompata otticamente) che possono in qualche caso sostituire il magnetometro SQUID. Si descrivono i princípi di funzionamento, la sensibilità, l’intervallo dinamico e la risposta di frequenza. Si dà un accenno riguardo l’applicazione di questi magnetometri nelle misurazioni biomagnetiche.
    Notes: Summary Flux gate and resonance type of magnetometers (free precession, optically pumped), which can in some cases replace the SQUID magnetometer, are discussed. The principles of operation, sensitivity, dynamical range and frequency response are described. The application of these magnetometers for biomagnetic measurements is mentioned.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02455925
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  • 3
    Electronic Resource
    Electronic Resource
    The magnetic field produced by the conduction system of the human heart (1983)
    Springer
    Il nuovo cimento della Società Italiana di Fisica 2 (1983), S. 255-265 
    Details
    ISSN: 0392-6737
    Keywords: Biomagnetism (including magnetocardiography) ; Superconducting devices ; superconducting magnets
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Description / Table of Contents: Riassunto È stata sfruttata la risoluzione spaziale del sensore magnetico per fornire stime numeriche del contributo atriale ai campi magnetici registrati esattamente prima della depolarizzazione ventricolare. Si trova che il contributo è piccolo, e questo rafforza l’interpretazione originale secondo la quale questi campi derivano principalmente dal sistema di conduzione del cuore.
    Notes: Summary We have exploited the spatial resolution of the magnetic sensor to provide numerical estimates of the atrial contribution to magnetic fields recorded just prior to ventricular depolarization. The contribution is found to be small, strenghening our original interpretation that such fields originate mostly in the conduction system of the heart.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02455929
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  • 4
    Electronic Resource
    Electronic Resource
    High-resolution isofield mapping in magnetocardiography (1983)
    Springer
    Il nuovo cimento della Società Italiana di Fisica 2 (1983), S. 291-300 
    Details
    ISSN: 0392-6737
    Keywords: Biomagnetism (including magnetocardiography) ; Superconducting devices ; superconducting magnets
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Description / Table of Contents: Riassunto Si presentano i risultati preliminari ottenuti costruendo mediante computer mappe di distribuzione di campo magnetico sulla base di registrazioni ad alta risoluzione effettuate con magnetometro superconduttore. La procedura è stata applicata per esaminare i MCG di 16 pazienti affetti da pregresso infarto del miocardio. Sulla base di questa elaborazione è stato possibile dividere i pazienti in due classi, una delle quali contiene tutti i pazienti con depolarizzazioni tardive.
    Notes: Summary A possible clinical application of a high-resolution magnetic isofield contour mapping technique in cardiography is discussed. Preliminary results are presented in applying this technique to patients with recent myocardial infarction. The patients could be divided into two classes; one of them contains patients with electrical late potentials as a subclass.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02455932
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  • 5
    Electronic Resource
    Electronic Resource
    Magnetic measurements of action currents in an isolated lobster axon (1983)
    Springer
    Il nuovo cimento della Società Italiana di Fisica 2 (1983), S. 512-516 
    Details
    ISSN: 0392-6737
    Keywords: Biomagnetism (including magnetocardiography) ; Superconducting devices ; superconducting magnets
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Description / Table of Contents: Riassunto Si presentano le prime misurazioni del campo magnetico prodotto da correnti di azione che si propagano lungo l’assone singolo di un nervo gigante. Questi dati sono stati ottenuti con un trasduttore a bobina toroidale e un amplificatore o semiconduttore a temperatura ambiente.
    Notes: Summary We present the first measurements of the magnetic field produced by action currents propagating along a single giant nerve axon. These data were obtained with a toroidal pick-up coil and a room temperature semiconductor amplifier.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02455950
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  • 6
    Electronic Resource
    Electronic Resource
    Clinical magnetoencephalography (1983)
    Springer
    Il nuovo cimento della Società Italiana di Fisica 2 (1983), S. 517-537 
    Details
    ISSN: 0392-6737
    Keywords: Biomagnetism (including magnetocardiography) ; Superconducting devices ; superconducting magnets
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Description / Table of Contents: Riassunto Finora la magnetoencefalografia spontanea (MEG) in soggetti normali e patologici non è stata investigata a fondo. Si conoscono pochissimi contributi in questo campo. A parte il lavoro del gruppo di biomagnetismo di Roma, il solo contributo clinico finora è stato quello di Hughes e collaboratori che era abbastanza limitato nel numero e nella scelta dei soggetti studiati. La nostra esperienza condotta fin dal 1980 su un gran numero di casi (principalmente epilessie focali) mostra che il MEG può evidenziare attività significative anche se non sono presenti anormalità EEG; esso ha inoltre una risoluzione spaziale maggiore rispetto all’EEG. I foci epilettici mostrano un’area limitata di attività massima. Finora non è stata osservata nessuna evidenza sperimentale di una differente distribuzione delle ampiezze del campo sullo scalpo. La risoluzione spaziale del MEG riguarda anche la possibilità di risolvere la morfologia dei segnali EEG (per esempio onde aguzze EEG risolte in gruppi di spikes dal MEG) o di separare topograficamente le anormalità EEG mescolate e non ben localizzate (per esempio, attività delta ed epilettiche mescolate nell’EEG e discriminate nel MEG). I migliori risultati si osservano quando la localizzazione è nella corteccia esterna. Dopo una descrizione del materiale studiato, si sottolinea l’importanza dei risultati ottenuti per la prima volta in casi di epilessie focali.
    Notes: Summary So far spontaneous magnetoencephalography (MEG) in normal and pathological subjects has not been deeply investigated. Very few contributions in this field are available. Aside from the work of the Rome biomagnetic group in this field, the only clinical contribution up to now has been that of Hughes and co-workers which was rather limited in the number and in the selection of subjects investigated. Our experience, carried out since 1980 on a large number of cases—mainly focal epilepsies— shows that the MEG may evidence significant activities even if EEG abnormalities are not present and has a higher spatial resolution with respect to the EEG. Epileptic foci show a limited area of maximal activity. So far no experimental evidence of a different distribution of field amplitude over the scalp has been observed. The spatial resolution of the MEG also regards the possibility of resolving the morphology of EEG signals (for instance, EEG sharp waves resolved into groups of spikes by MEG) or topographically separate EEG abnormalities mixed up and not well localized (for instance, delta and epileptic activities mixed up in the EEG, but differently in the MEG). The best results are observed when the localization is in the outer cortex. After a description of the material studied, the importance of the results obtained for the first time in cases of focal epilepsies is outlined.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02455951
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  • 7
    Electronic Resource
    Electronic Resource
    Localization of epileptic foci by means of biomagnetic measurements (1983)
    Springer
    Il nuovo cimento della Società Italiana di Fisica 2 (1983), S. 547-557 
    Details
    ISSN: 0392-6737
    Keywords: Biomagnetism (including magnetocardiography) ; Superconducting devices ; superconducting magnets
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Description / Table of Contents: Riassunto Durante l’ultimo anno gli autori hanno condotto una ricerca sistematica su un gran numero di soggetti patologici registrando simultaneamente l’EEG e il MEG. La presente versione del nostro apparato sperimentale permette di effettuare misure MEG con un solo sensore magnetico, impedendo la rilevazione simultanea di attività MEG su punti differenti della testa. Ciò ha condotto gli autori a concentrarsi sulle epilessie focali. Fin dalle prime misure il sensore magnetico ha dimostrato un notevole potere localizzante, rafforzando l’interesse per la localizzazione in casi patologici. In questo lavoro si riportano risultati che sembrano confermare la straordìnaria capacità delle misure MEG nel localizzare sorgenti di attività cerebrali patologiche in casi di epilessie focali.
    Notes: Summary During the last year the authors have been carrying out a systematic investigation on a large number of pathological subjects simultaneously recording the EEG and the MEG. The present version of our experimental apparatus allows MEG measurements with only one magnetic detector, thus preventing the detection of simultaneous MEG activities over different points of the head. This has led the authors to concentrate upon focal epilepsies. Since the first measurements a remarkable localizing power was shown by the magnetic detector, thus strengthening the interest in pathological localization. In this contribution we report results which seem to confirm the extraordinary capability of MEG measurements to localize sources of pathological brain activities in cases of focal epilepsies.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02455953
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  • 8
    Electronic Resource
    Electronic Resource
    Optimizing vector magnetocardiographic lead fields by using a physical torso model (1983)
    Springer
    Il nuovo cimento della Società Italiana di Fisica 2 (1983), S. 356-367 
    Details
    ISSN: 0392-6737
    Keywords: Biomagnetism (including magnetocardiography) ; Superconducting devices ; superconducting magnets
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Description / Table of Contents: Riassunto Sono state esaminate l’idealità e la sensibilità di parecchi conduttori magnetocardiografici vettoriali usando un modello inomogeneo fisico del tronco. Si è trovato che la componente antero-posterioreX vettore magnetico del cuore è la piú facile da scoprire. Si suggeriscono conduttori ideali per le altre due componenti. Comunque questi hanno una sensibilità inferiore. Le differenze rispetto ai risultati di precedenti ricercatori sono state spiegate con le differenze tra i modelli.
    Notes: Summary The ideality and sensitivity of several vector magnetocardiographic leads were tested by using an inhomogeneous, physical torso model. The postero-anterior component of the heart’s magnetic vector was found easiest to detect. New, more ideal leads for the other two components are suggested. However, these have lower sensitivity. The differences from the results of former investigators can be explained by the differences of the models.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02455938
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  • 9
    Electronic Resource
    Electronic Resource
    Adaptive noise cancellation in neuromagnetic measurement systems (1983)
    Springer
    Il nuovo cimento della Società Italiana di Fisica 2 (1983), S. 203-213 
    Details
    ISSN: 0392-6737
    Keywords: Biomagnetism (including magnetocardiography) ; Superconducting devices ; superconducting magnets
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Description / Table of Contents: Riassunto Si è studiato lo spettro del rumore di un gradiometro superconduttore a derivata secon da in un agglomerato urbano. I dati sono stati ottenuti dal gradiometro con tre accelerometri ortogonali e un magnetometro a flussometro elettronico triassiale attaccato al dewar. Questi dati sono stati analizzati usando tecniche di elaborazione dei segnali, soprattutto un cancellatore adattativo di rumori, per ridurre i rumori nei dati del gradiometro. I risultati mostrano qui che il rumore dell’esterno e/o il rumore del movimento del dewar possono essere ridotti di 40 dB in potenza di rumore. Si è anche mostrato che, nel caso di basso rapporto segnale-rumore (S/N∼1), può essere estratta un’onda sunusoidale di 10 Hz. Questa tecnica non solo promette riduzione dei rumori, ma ha anche lo scopo d’identificare i segnali di rumore che potrebbero essere veramente considerati parte del responso evocato. L’analisi dei dati che contengono i responsi evocati è ora in corso.
    Notes: Summary The noise spectrum of a superconducting second-derivative gradiometer has been investigated in an urban environment. Data have been acquired from the gradiometer with three orthogonal accelerometers and a triaxial fluxgate magnetometer attached to the dewar. These data have been analyzed by using signal processing techniques, primarily an adaptive noise canceller, to reduce noise in the gradiometer data. Results shown here indicate that the environmental noise and/or the dewar motion noise can be reduced as much as 40 dB in noise power. It is also shown, in the case of poor signal-to-noise ratio (S/N∼1), that a 10 Hz sine wave can be extracted. This technique not only shows promise for noise reduction, but also aids in the identification of noise signals which might be misconstrued as part of the evoked response. Analysis of data containing evoked response is now underway.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02455924
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  • 10
    Electronic Resource
    Electronic Resource
    First-gradient balancing of higher-order gradiometers (1983)
    Springer
    Il nuovo cimento della Società Italiana di Fisica 2 (1983), S. 142-152 
    Details
    ISSN: 0392-6737
    Keywords: Biomagnetism (including magnetocardiography) ; Superconducting devices ; superconducting magnets
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Description / Table of Contents: Riassunto Si sviluppa un formalismo per la descrizione vettoriale e tensoriale di una procedura di bilanciamento e si sottolinea un metodo di bilanciamento di campo e di primo gradiente. Si discutono l’apparecchiatura sperimentale e le misurazioni del vettore di modo comune del primo gradienteC G 1.
    Notes: Summary A formalism for the vector and tensor description of a balancing procedure is developed and a first-gradient and field-balancing method is outlined. The experimental apparatus and measurements of the first-gradient common-mode vector,C G 1, are discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02455918
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  • 11
    Electronic Resource
    Electronic Resource
    Neuromagnetic measurements at hospital: Instrumentation and preliminary tests (1983)
    Springer
    Il nuovo cimento della Società Italiana di Fisica 2 (1983), S. 184-194 
    Details
    ISSN: 0392-6737
    Keywords: Biomagnetism (including magnetocardiography) ; Superconducting devices ; superconducting magnets
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Description / Table of Contents: Riassunto Si è costruito espressamente un sistema SQUID in un ospedale di Parigi, che permette indagini neuromagnetiche attinenti con applicazioni cliniche. Un gradiometro simmetrico di second’ordine lavora entro uno schermo per corrente parassite. Ciò è designato ad ottimizzare il costo e l’efficienza del sistema. Le sue prestazioni sono state sperimentate con dati da pazienti e da soggetti normali.
    Notes: Summary A SQUID system was specially built in a Parisian hospital, allowing neuromagnetic investigations dealing with clinical applications. A second-order symmetrical gradiometer works inside an eddy current shield. This was designed for optimizing the cost and the efficiency of the system. Its performances were tested with data from patients and normal subjects.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02455922
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  • 12
    Electronic Resource
    Electronic Resource
    A portable biomagnetic measuring system (1983)
    Springer
    Il nuovo cimento della Società Italiana di Fisica 2 (1983), S. 224-230 
    Details
    ISSN: 0392-6737
    Keywords: Biomagnetism (including magnetocardiography) ; Superconducting devices ; superconducting magnets
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Description / Table of Contents: Riassunto Si descrive la strumentazione per le applicazioni biomagnetiche. Le piccole dimensioni e la leggerezza del gradiometro SQUID permettono il facile trasporto e posizionamento dello strumento, rendendo cosí possibile le misurazioni biomagnetiche in una qualsiasi locazione in cui non ci siano rumori. L’apparecchio è provvisto di un alimentatore a batteria e, se riempito con 60 cm3 di elio liquido, funzionerà initerrottamente per 6 ore. L’apparecchio è adatto per la magnetocardiografia.
    Notes: Summary The instrumentation for biomagnetic applications is described. The small size and weight of the SQUID gradiometer permit easy transport and positioning of the instrument, thus making biomagnetic measurements possible in any noise-free location. The equipment is provided with a battery power supply, and, when filled with 60 cm3 of liquid helium, will operate continuously for 6 h. The device is suitable for magnetocardiography.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02455926
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  • 13
    Electronic Resource
    Electronic Resource
    Comparison between measured and simulated magnetocardiograms in a case of anterolateral myocardial infarction (1983)
    Springer
    Il nuovo cimento della Società Italiana di Fisica 2 (1983), S. 301-310 
    Details
    ISSN: 0392-6737
    Keywords: Biomagnetism (including magnetocardiography) ; Superconducting devices ; superconducting magnets
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Description / Table of Contents: Riassunto Si confrontano i magnetocardiogrammi misurati in un caso di infarto miocardico anterolaterale con i corrispondenti magnetocardiogrammi simulati. I cambiamenti piú notevoli nell’MCG misurato si sono osservati nelle parti superiori e inferiori del torace come previsto dalla simulazione.
    Notes: Summary The MCGs measured in a case of an anterolateral myocardial infarction were compared with the corresponding simulated MCGs. The most distinctive changes in the measured MCGs were observed in the upper and lower parts of the thorax as predicted by the simulation.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02455933
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  • 14
    Electronic Resource
    Electronic Resource
    Determination of the spatial distribution of abnormal EEG and MEG from current dipole in inhomogeneous volume conductor (1983)
    Springer
    Il nuovo cimento della Società Italiana di Fisica 2 (1983), S. 558-566 
    Details
    ISSN: 0392-6737
    Keywords: Biomagnetism (including magnetocardiography) ; Superconducting devices ; superconducting magnets
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Description / Table of Contents: Riassunto La conduttività elettrica delle lesioni cerebrali varia con situazioni patologiche come l’edema e la calcificazione. È stato studiato mediante una simulazione con il computer l’effetto delle disomogeneità dei tessuti delle lesioni cerebrali sulle distribuzioni spaziali dei potenziali elettrici e dei campi magnetici sulla superficie del capo.
    Notes: Summary The electrical conductivity of brain lesions varies with pathological situations such as edema and calcification. The effect of the tissue inhomogeneities of brain lesions on spatial distributions of electrical potentials and magnetic fields over the surface of the head was studied by means of a computer simulation.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02455954
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  • 15
    Electronic Resource
    Electronic Resource
    Diagnostic assessment of human iron stores by measurement of hepatic magnetic susceptibility (1983)
    Springer
    Il nuovo cimento della Società Italiana di Fisica 2 (1983), S. 567-581 
    Details
    ISSN: 0392-6737
    Keywords: Biomagnetism (including magnetocardiography) ; Superconducting devices ; superconducting magnets
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Description / Table of Contents: Riassunto Si è sviluppato un metodo magnetico per misurazioni dirette non invasive del ferro di immagazzinamento epatico umano con uno suscettometro SQUID. Le determinazioni magneticain vivo e chimicain vitro del ferro epatico non eme sono strettamente correlate. Le misurazioni magnetiche dei depositi di ferro sono utili, dal punto di vista clinico, nella diagnosi dei disordini nel metabolismo del ferro.
    Notes: Summary A magnetic method for direct noninvasive measurements of human hepatic storage iron with a SQUID susceptometer has been developed.In vivo magnetic andin vitro chemical determinations of liver nonheme iron are closely correlated. Magnetic measurements of iron stores are clinically useful in the diagnosis of disorders of iron metabolism.
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    URL: http://dx.doi.org/10.1007/BF02455955
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  • 16
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    The inverse problem in magnetopneumography (1983)
    Springer
    Il nuovo cimento della Società Italiana di Fisica 2 (1983), S. 594-607 
    Details
    ISSN: 0392-6737
    Keywords: Biomagnetism (including magnetocardiography) ; Superconducting devices ; superconducting magnets
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Description / Table of Contents: Riassunto Il problema inverso nella misurazione magnetical del polmone è stato studiato con un metodo che usa le ipotetiche distribuzioni del pulviscolo magnetico. Si sono fatte le minimizzazioni non vincolate e vincolate di una funzione obiettiva. Le simulazioni e l’analisi hanno mostrato l’efficacia del metodo.
    Notes: Summary The inverse problem in the magnetic measurement of the lung was studied with a method using hypothetical distributions of magnetic dust. Both unconstrained and constrained minimizations of an objective function were performed. Simulations and analysis showed the efficacy of the method.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02455957
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  • 17
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    A clinical system for accurate assessment of tissue iron concentration (1983)
    Springer
    Il nuovo cimento della Società Italiana di Fisica 2 (1983), S. 582-593 
    Details
    ISSN: 0392-6737
    Keywords: Biomagnetism (including magnetocardiography) ; superconducting devices ; superconducting magnets
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Description / Table of Contents: Riassunto Questo lavoro descrive un nuovo suscettometro SQUID a doppio canale coadiuvato da computer destinato a raggiungere stime accuratein vivo delle concentrazioni di accumulo di ferro nei tessuti. Si discutono le considerazioni pratiche dello schema, la funzionalità sperimentale al rumore e la risoluzione clinica anticipata del nuovo sistema.
    Notes: Summary This paper describes a new computer-enhanced dual-channel SQUID susceptometer designed to achieve accuratein vivo estimates of tissue storage iron concentrations. We discuss the practical design considerations, instrumental noise performance and anticipated clinical resolution of the new system.
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    URL: http://dx.doi.org/10.1007/BF02455956
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  • 18
    Electronic Resource
    Electronic Resource
    Magnetopneumography in welders: Observations on relaxation and clearance (1983)
    Springer
    Il nuovo cimento della Società Italiana di Fisica 2 (1983), S. 608-616 
    Details
    ISSN: 0392-6737
    Keywords: Biomagnetism (including magnetocardiography) ; Superconducting devices ; superconducting magnets
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Description / Table of Contents: Riassunto Si è trovato che la velocità di decadimento del campo residuo ottenuto tramite magnetizzazione delle particelle ferromagnetiche trattenute nei polmoni dei saldatori è associato a fattori come la quantità di polvere trattenuta, il curriculum lavorativo e la consuetudine di fumare. Una velocità di decadimento piú rapida appare correlata con un piú rapido smaltimento delle particelle di fumo di saldatura nei fumatori.
    Notes: Summary It was found that the rate of decay of the remanent field obtained through magnetization of ferrimagnetic particles retained in the lungs of are welders is associated with factors such as amount of dust retained, occupational history and smoking habits. A faster decay rate was found to correlate with a faster clearance of welding fume particles in smokers
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    URL: http://dx.doi.org/10.1007/BF02455958
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  • 19
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    Magnetic particles in the lung: A probe for alveolar macrophage function (1983)
    Springer
    Il nuovo cimento della Società Italiana di Fisica 2 (1983), S. 617-623 
    Details
    ISSN: 0392-6737
    Keywords: Biomagnetism (including magnetocardiography) ; Superconducting devices ; superconducting magnets
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Description / Table of Contents: Riassunto Particelle ferromagnetiche immesse per via intratracheale nei polmoni sono fagocitate da macrofagi alveolari. Dopo che queste particelle sono state magnetizzate dal campo esterno, esse producono un campo residuo che decade rapidamente a causa del disallineamento delle particelle dovuto al movimento citoplasmatico (rilassamento). I cambiamenti nel valore di rilassamento nel tempo successivo all’immissione potrebbero essere connessi alla mobilità citoplasmatica.
    Notes: Summary Ferrimagnetic particles instilled intratracheally into the lungs are phagocytized by alveolar macrophages. After these particles are magnetized by an external field, they produce a remanent field which decays rapidly due to particle misalignment from cytoplasmic motion (relaxation). Changes in relaxation rate with time following instillation might be related to cytoplasmic motility.
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    URL: http://dx.doi.org/10.1007/BF02455959
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    Magnetic-susceptibility plethysmography (1983)
    Springer
    Il nuovo cimento della Società Italiana di Fisica 2 (1983), S. 624-641 
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    ISSN: 0392-6737
    Keywords: Biomagnetism (including magnetocardiography) ; Superconducting devices ; superconducting magnets
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Description / Table of Contents: Riassunto La pletismografia a suscettività magnetica (MSPG) è un nuovo metodo proposto per controllare i cambiamenti del volume cardiaco. Si riesaminano il principio di misurazione e i lavori recenti di altri ricercatori. Si studia l’effetto del movimento legato al cuore della cassa toracica anteriore sul segnale MSPG.I risultati suggeriscono che il movimento del confine cassa toracica-aria può contribuire in modo significativo (∼75%) al segnale MSPG quando è registrato vicino al cuore.
    Notes: Summary Magnetic-susceptibility plethysmography (MSPG) is a new method proposed for monitoring cardiac-volume changes. The measurement principle and recent work by other investigators are reviewed. The effect of the cardiac-related motion of the anterior chest wall on the MSPG signal is studied. The results suggest that the motion of the chest-wall-air boundary may contribute significantly (∼75%) to the MSPG signal when recorded near the heart.
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    URL: http://dx.doi.org/10.1007/BF02455960
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    Magnetic signals from human skeletal muscles (1983)
    Springer
    Il nuovo cimento della Società Italiana di Fisica 2 (1983), S. 642-649 
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    ISSN: 0392-6737
    Keywords: Biomagnetism (including magnetocardiography) ; Superconducting devices ; superconducting magnets
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Description / Table of Contents: Riassunto È stata esaminata la forma d’onda d’impulso per il magnetomiogramma (MMG) dell’arto inferiore destro umano. Le durate tipiche degl’impulsi sono di circa (10÷20) ms. La variazione spaziale del MMG suggerisce un’origine nei muscoli anteriori della tibia.
    Notes: Summary The pulse wave form for the magnetomyogram (MMG) of the human right leg was examined. The typical pulse durations are about (10÷20) ms. The spatial variation of the MMG suggests a source in the anterior muscles.
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    URL: http://dx.doi.org/10.1007/BF02455961
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    d.c. Magnetic fields of the human leg as a function of position and relaxation (1983)
    Springer
    Il nuovo cimento della Società Italiana di Fisica 2 (1983), S. 650-659 
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    ISSN: 0392-6737
    Keywords: Biomagnetism (including magnetocardiography) ; Superconducting devices ; superconducting magnets
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Description / Table of Contents: Riassunto Le ricerche sul campo magnetico intorno alla gamba umana con l’uso di un magnetometro SQUID producono risultati consistenti e riproducibili che possono essere rappresentati mediamente due linee di corrente, orientate inversamente, parallele all’asse della gamba. I campi sono condizionati dall’attività muscolare, che decade col tempo di rilassamento della gamba.
    Notes: Summary Investigations of the magnetic field around the human leg using a SQUID magnetometer yield consistent, reproducible results which can be modelled by 2 oppositely oriented line currents parallel to the leg axis. The fields are affected by muscle activity, decaying with the time of relaxation of the leg.
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    URL: http://dx.doi.org/10.1007/BF02455962
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    Optimization of the second-order gradiometer base length that has been designed for the measurement of weak inhomogeneous magnetic fields (1983)
    Springer
    Il nuovo cimento della Società Italiana di Fisica 2 (1983), S. 175-183 
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    ISSN: 0392-6737
    Keywords: Biomagnetism (including magnetocardiography) ; Superconducting devices ; superconducting magnets
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Description / Table of Contents: Riassunto In questo lavoro si tratta il problema dell’ottimizzazione di sistemi di sensori gradiometrici metrici superconduttori di secondo ordine che sono stati progettati per la misurazione di campi magnetici deboli disomogenei in un ambiente disturbato magneticamente. Si considerano le condizioni di massimo rapporto segnale-rumore dell’uscita del quantomagnetometro superconduttote (SQM). Si analizza l’influenza dei parametri misurati della sorgente del segnale, del rumore di una sorgente di disturbo esterna e di quello proprio del magnetometro sulla selezione della lunghezza di base del gradiometro.
    Notes: Summary In this paper we deal with an optimization problem of the second-order superconducting gradiometric sensor systems that have been designed for measurement of the weak inhomogeneous magnetic fields in a magnetically disturbed environment. The conditions of maximum signalto-noise ratio of the output of superconducting quantum magnetometers (SQM) are considered. The influence of measured signal source parameters, of an outside disturbing source and of the own noise of the magnetometer on the gradiometer base length selection is analysed.
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    URL: http://dx.doi.org/10.1007/BF02455921
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    An eddy-current-shielded room with a partially closed entrance (1983)
    Springer
    Il nuovo cimento della Società Italiana di Fisica 2 (1983), S. 195-202 
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    ISSN: 0392-6737
    Keywords: Biomagnetism (including magnetocardiography) ; Superconducting devices ; superconducting magnets
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Description / Table of Contents: Riassunto Si mostra che miglioramenti sostanziali possono essere ottenuti nelle proprietà di schermatura di una stanza schermata da corrente parassite coprendo l’accesso con lamine conduttrici. I risultati suggeriscono che non è necessario installare una porta conduttrice e mostrano che è il caso di coprire una piccola parte della porta in modo permanente.
    Notes: Summary We show that substantial improvements can be obtained in the shielding properties of an eddy-current-shielded room by covering the doorway with conductive plates. Results suggest that it is unnecessary to install a conductive door and show that it is worthwhile covering a small part of the doorway permanently.
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    URL: http://dx.doi.org/10.1007/BF02455923
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    High-resolution recordings of thePR segment in magnetocardiography (1983)
    Springer
    Il nuovo cimento della Società Italiana di Fisica 2 (1983), S. 248-254 
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    ISSN: 0392-6737
    Keywords: Biomagnetism (including magnetocardiography) ; Superconducting devices ; superconducting magnets
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Description / Table of Contents: Riassunto Il magnetocardiogramma ad alta risoluzione è stato registrato mediante magnetometri superconduttori in 12 volontari sani utilizzando la camera schermata di Berlino per ridurre il livello di rumore elettromagnetico. La morfologia del trattoPR magnetico è caratterizzata dalle «rampe» in precedenza osservate, sulle quali s’inseriscono segnali. A volte la forma d’onda appare complessa.
    Notes: Summary ThePR interval of magnetocardiograms has been measured with a SQUID sensor in the Berlin magnetically shielded room. In addition to previously reported ramps with isolated superimposed signals in several cases a structured morphology has been found.
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    URL: http://dx.doi.org/10.1007/BF02455928
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    Atrial activity during thePR segment of the MCG (1983)
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    Il nuovo cimento della Società Italiana di Fisica 2 (1983), S. 266-279 
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    ISSN: 0392-6737
    Keywords: Biomagnetism (including magnetocardiography) ; Superconducting devices ; superconducting magnets
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Description / Table of Contents: Riassunto Sono stati osservati segnali degradanti nel segmentoPR dei magnetocardiogrammi normali registrati da 5 cani. Sono state osservate rampe maggiori dopo aver indotto con farmaci il blocco del nodo atrioventricolare di primo grado, ed è stata osservata una completa ripolarizzazione atriale a seguito d’isolate contrazioni atriali in due animali con blocco di secondo grado. Queste rampe, che variano fino a 6.7 pT in ampiezza e provengono dagli atri, possono complicare l’individuazione magnetica dell’attività di His-Purkinje.
    Notes: Summary Sloping signals were observed in thePR segment of normal magnetocardiograms recorded from five dogs. Larger ramps were observed after first-degree AV nodal blockade was induced pharmacologically, and complete atrial repolarization was observed following isolated atrial contractions in two animals with second-degree block. These ramps, ranging up to 6.7 pT in size and arising from the atria, may complicate magnetic detection of His-Purkinje activity.
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    URL: http://dx.doi.org/10.1007/BF02455930
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    High-resolution magnetic measurements of human cardiac electrophysiological events (1983)
    Springer
    Il nuovo cimento della Società Italiana di Fisica 2 (1983), S. 231-247 
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    ISSN: 0392-6737
    Keywords: Biomagnetism (including magnetocardiography) ; PACS. 85.25 ; Superconducting devices ; superconducting magnets
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Description / Table of Contents: Riassunto La motivazione fondamentale per lo studio dei fenomeni elettrofisiologici cardiaci tramite il metodo biomagnetico è dovuta al fatto che questa tecnica offre un’alta risoluzione spaziale e sembra fornire informazioni complementari rispetto alle sole registrazioni elettriche. Fino ad oggi l’interesse degli studiosi si è concentrato su due differenti fenomeni cardiaci: 1) lo studio dell’attività del sistema di conduzione atrioventricolare e 2) lo studio della depolarizzazione ventricolare anormalmente ritardata (late potentials). L’interesse clinico per lo studio non invasivo del sistema di His-Purkinje (HPS) è ben noto. Registrazioni cliniche non invasive di late potentials sono particolarmente desiderabili in quanto possono essere preziosi indicatori di rischio di morte improvvisa. In questo lavoro si presenta una rassegna sullo stato delle ricerche in entrambi i campi d’indagine.
    Notes: Summary The fundamental motivation for investigating cardiac electrophysiological phenomena by means of the biomagnetic method has been that this technique should have added spatial resolution and provided complementary information as opposed to electric recordings only. So far the interest of experimentalists has been concentrated on two different kinds of cardiac phenomena: 1) the study of the activity of the cardiac conduction system and 2) of abnormally delayed ventricular depolarization (late potentials). The clinical interest for the noninvasive investigation of the His-Purkinje system (HPS) is well known. Noninvasive clinical recording of late potentials is particularly desirable as they seem to be precious markers for risk of sudden death. A review of the state of research in both fields is presented in this paper.
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    URL: http://dx.doi.org/10.1007/BF02455927
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    Magnetic measurements and modelling for the investigation of the human-heart conduction system (1983)
    Springer
    Il nuovo cimento della Società Italiana di Fisica 2 (1983), S. 280-290 
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    ISSN: 0392-6737
    Keywords: Biomagnetism (including magnetocardiography) ; Superconducting devices ; superconducting magnets
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Description / Table of Contents: Riassunto Ein dal 1980 è iniziato uno studio sistematico dell’attività del sistema di His-Purkjnje (HPS) su soggetti normali e patologici con il metodo biomagnetico. Allo scopo di risolvere il problema di quanta parte dei segnali misurati sia attribuibile al sistema di His-Purkinje e quanta piuttosto alla ripolarizzazione atriale, è stata recentemente sviluppata una strumentazione appositamente disegnata per misure sul HPS e con una sensibilità di $$20fT/\sqrt {Hz}$$ nella banda di frequenze interessanti ((0.5÷300) Hz). Al contempo si è altresí sviluppato un nuovo modello teorico in stretta corrispondenza con le caratteristiche anatomiche del HPS che fornisce una distribuzione di campo magnetico sul torace in buon accordo qualitativo con i risultati sperimentali.
    Notes: Summary Since 1980, systematic investigations of the activity of the His-Purkinje system (HPS) by the biomagnetic method have been reported on both normal subjects and patients affected by different kinds of conduction disturbances. A first attempt to interpret the experimental results by means of a theoretical model satisfactorily accounted for the measured «ramp» patterns. Moreover, a good temporal coincidence was observed between magnetic signals and invasively recorded His bundle electrograms (HBE). An alternative explanation of the «ramp» pattern, in terms of atrial repolarization, has been recently proposed on the basis of animal experimental investigation. In order to try to solve this problem, we have carried out a twofold approach: a new second-order gradiometer, specifically designed for HPS activity investigation has been successfully set up and tested; it provides a sensitivity of $$20fT/\sqrt {Hz}$$ in the band width of interest ((0.5÷300) Hz). Second, a new model based on a closer correspondence to anatomical features of the HPS has been developed. This model provides well-defined patterns which are in quite good agreement with experimental results.
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    URL: http://dx.doi.org/10.1007/BF02455931
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    The mapping of the measured cardiac electric potential and magnetic-field distribution (1983)
    Springer
    Il nuovo cimento della Società Italiana di Fisica 2 (1983), S. 311-323 
    Details
    ISSN: 0392-6737
    Keywords: Biomagnetism (including magnetocardiography) ; Superconducting devices ; superconducting magnets
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Description / Table of Contents: Riassunto Si registra la distribuzione sia del potenziale elettrico cardiaco sulla superficie del corpo che del campo magnetico cardiaco vicino al torace e alla schiena in momenti fissi del ciclo cardiaco. Le caratteristiche generali di entrambi i tipi di mappa sono semplici e riproducibili, inoltre ciascuno di essi fornisce informazioni differenti.
    Notes: Summary The distribution of both the cardiac electric potential on the body surface and the cardiac magnetic field near the chest and back is recorded at fixed time instants of the heart cycle. The general features of both types of maps are simple and reproducible, moreover they both reveal different information.
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    The influence of inhomogeneities on the cardiac-magnetic-field distribution (1983)
    Springer
    Il nuovo cimento della Società Italiana di Fisica 2 (1983), S. 324-339 
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    ISSN: 0392-6737
    Keywords: Biomagnetism (including magnetocardiography) ; Superconducting devices ; superconducting magnets
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Description / Table of Contents: Riassunto Sono stati eseguiti calcoli numerici sul campo magnetico generato dal cuore durante la depolarizzazione ventricolare. Lo scopo di questo lavoro è studiare il contributo d’inomogeneità nel conduttore di volume al campo totale e stabilire l’influenza dei gradiometri usati nelle registrazioni sperimentali.
    Notes: Summary Numerical computations were performed on the magnetic field generated by the heart during ventricular depolarization. The purpose of this study was to investigate the contribution of inhomogeneities in the volume conductor to the total field and to establish the influence of gradiometers as used in experimental recordings.
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    URL: http://dx.doi.org/10.1007/BF02455935
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    High-resolution magnetocardiographic recordings of theST segment in patients with electrical late potentials (1983)
    Springer
    Il nuovo cimento della Società Italiana di Fisica 2 (1983), S. 340-345 
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    ISSN: 0392-6737
    Keywords: Biomagnetism (including magnetocardiography) ; Superconducting devices ; superconducting magnets
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Description / Table of Contents: Riassunto Il magnetocardiogramma ad alta risoluzione, registrato in 22 pazienti affetti da pregresso infarto del miocardio, ha permesso di rilevare in 3 casi la presenza di segnali di ampiezza tra 0.4 e 3 pT temporalmente correlati a depolarizzazioni tardive elettriche. Si discutono de differenze tra segnali magnetici ed elettrici e il loro possibile significato fisiopatologico.
    Notes: Summary High-resolution magnetocardiograms of patients with recent myocardial infarction have been recorded. In three cases, signals have been found in theST segment that are time correlated with simultaneously recorded late electric potentials.
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    On the influence of the volume conductor in magnetocardiography: an experimental approach (1983)
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    Il nuovo cimento della Società Italiana di Fisica 2 (1983), S. 346-355 
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    ISSN: 0392-6737
    Keywords: Biomagnetism (including magnetocardiography) ; Superconducting devices ; superconducting magnets
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Description / Table of Contents: Riassunto Per studiare l’effetto della geometria del conduttore di volume, sono stati compiuti esperimenti usando cuori di coniglio isolati. È stato osservato un aumento del segnale magnetico con l’aumentare della dimensione del conduttore di volume. Si discutono i risultati usando un dipolo di corrente a origine fissa e un modello di sorgente di tensione per il cuore.
    Notes: Summary To study the effect of the volume conductor geometry on the MCG, experiments using isolated rabbit hearts were done. An increase of the magnetic signal when increasing the volume conductor’s size was observed. The results are discussed by using a fixed-origin current dipole and a voltage source model for the heart.
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    First magnetic measurements of action currents in isolated cardiac Purkinje fibers (1983)
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    Il nuovo cimento della Società Italiana di Fisica 2 (1983), S. 368-378 
    Details
    ISSN: 0392-6737
    Keywords: Biomagnetism (including magnetocardiography) ; Superconducting devices ; superconducting magnets
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Description / Table of Contents: Riassunto Si presentano le prime misurazioni del campo magnetico associato col potenziale d’azione in un fascio di fibre cardiache di Purkinje isolate. Le nostre scoperte dimonstrano la fattibilità dell’uso di tecniche magnetiche per misurare le correnti assiali in un gruppo di cellule cardiache ad attività spontanea.
    Notes: Summary We present the first measurements of the magnetic field associated with the action potential in a bundle of isolated cardiac Purkinje fibers. Our findings demonstrate the feasibility of using magnetic techniques to measure the axial current in a bundle of spontaneously active cardiac cells.
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    URL: http://dx.doi.org/10.1007/BF02455939
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    Inferences concerning anatomy and physiology of the human brain based on its magnetic field (1983)
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    Il nuovo cimento della Società Italiana di Fisica 2 (1983), S. 379-409 
    Details
    ISSN: 0392-6737
    Keywords: Biomagnetic (including magnetocardiography) ; Superconducting devices ; superconducting magnets
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Description / Table of Contents: Riassunto Si riesaminano le ricerche sul campo magnetico indotto compiute negli ultimi due anni. Questi studi hanno mostrato che la tecnica magnetica si puó usare 1) per rivelare aspetti complementari delle fonti di corrente comuni al potenziale indotto, 2) per identificare l’organizzazione della corteccia cerebrale e delle arce subcorticali e 3) per misurare le proprietà funzionali delle aree neurali attive le cui posizioni sono identificate.
    Notes: Summary Research in the evoked magnetic field reported in the last two years is reviewed. The studies have shown that the magnetic technique may be used 1) to reveal complementary aspects of the current sources common to evoked potential, 2) to identify the organization of the cerebral cortex and subcortical areas of the brain and 3) to measure functional properties of the active neural areas whose locations are identified.
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    Retinotopic map on the visual cortex for eccentrically placed patterns: First noninvasive measurement (1983)
    Springer
    Il nuovo cimento della Società Italiana di Fisica 2 (1983), S. 410-419 
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    ISSN: 0392-6737
    Keywords: Biomagnetism (including magnetocardiography) ; Superconducting devices ; superconducting magnets
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Description / Table of Contents: Riassunto Il campo magnetico corticale osservato, suscitato da uno stimolo presentato a varie eccentricità nel campo visivo, è stato interpretato come derivante da dipoli di corrente lungo la scissura longitudinale. La profondità della sorgente aumenta con l’aumento dell’eccentricità, in accordo con la classica mappatura retinotopica.
    Notes: Summary The observed cortical magnetic field evoked by a stimulus presented at various eccentricities in the visual field was interpreted as arising from current dipoles along the longitudinal fissure. The depth of the source increased as the eccentricity was increased, in agreement with the classical retinotopic map.
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    Neuromagnetic localization of two components of the transient visual evoked response to patterned stimulation (1983)
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    Il nuovo cimento della Società Italiana di Fisica 2 (1983), S. 420-428 
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    ISSN: 0392-6737
    Keywords: Biomagnetism (including magnetocardiography) ; Superconducting devices ; superconducting magnets
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Description / Table of Contents: Riassunto Si esamiano i componenti elettrici e magnetici della risposta stimolata visiva del cervello, con picchi a 120 e 180 ms dopo lo stimolo. I risultati mostrano che entrambi i componenti magnetici sono localizzati nella corteccia occipitale superficiale tangenziale al cuoio capelluto. La distribuzione diM120 suggerisce che i generatori dei componenti elettrici e magnetici sono correlati, ma il campo magnetico elettrico registrato è una modificazione elaborata di quello prodotto dalla sorgente.
    Notes: Summary Corresponding electrical and magnetic components of the brain’s visual evoked response peaking at 120 and 180 ms poststimulus are examined. Results show that both magnetic components are localized in the superficial occipital cortex tangential to the scalp. The distribution ofM120 suggests that the generators for the electrical and magnetic components are related, but the electrical field recorded is an elaborate modification of that produced by the source.
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    Somatosensory evoked magnetic fields: Mappings and the influence of the stimulus repetition rate (1983)
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    Il nuovo cimento della Società Italiana di Fisica 2 (1983), S. 429-437 
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    ISSN: 0392-6737
    Keywords: Biomagnetism (including magnetocardiography) ; Superconducting devices ; superconducting magnets
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Description / Table of Contents: Riassunto Campi magnetici indotti dalla sensibilità somatica sono stati confrontati con i corrispondenti potenziali elettrici sul cuoio capelluto allo scopo di studiare le loro sorgenti neurali. Le mappature delle risposte magnetiche hanno mostrato attività a livello delle cortecce di sensibilità somatica primarie e secondarie. Ulteriori sorgenti oltre a queste aree sembrano essere coinvolte nella generazione dei potenziali del cuoio capelluto a vertice somatosensoriali.
    Notes: Summary Somatosensory evoked magnetic fields were compared with corresponding electric scalp potentials in order to study their neural sources. Mappings of the magnetic responses showed activity at the primary and secondary somatosensory cortices. Additional sources besides these areas seem to be involved in the generation of the somatosensory vertex scalp potentials.
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    URL: http://dx.doi.org/10.1007/BF02455943
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    Some tentative model considerations based on experimental neuromagnetic data (1983)
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    Il nuovo cimento della Società Italiana di Fisica 2 (1983), S. 438-459 
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    ISSN: 0392-6737
    Keywords: Biomagnetism (including magnetocardiography) ; Superconducting devices ; superconducting magnets
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Description / Table of Contents: Riassunto In questo lavoro si presentano alcuni tentativi di considerazioni modello, basati sul concetto di dipolo di corrente equivalente per tener conto delle risposte sonore stimolate osservate, con lo scopo di tentare un confronto delle variazioni in ampiezza e latenza con calcoli basati sul modello di nervo altamente semplificato di Rall. Si presenta un’analisi fenomenologica dei dati sperimentali sul campo magnetico sonoro tardo evocato dalla corteccia uditiva umana. Qui si pone l’accento sulle relazioni tra le proprietà del segnale (per esempio, ampiezza e latenza) e tra le proprietà del segnale e le proprietà dello stimolo (per esempio, ampiezza/latenza e frequenza in discesa relativa Δf/f per uno stimolo con frequenza in discesa) piuttosto che su problemi correlati con la posizione del dipolo di corrente equivalente, per esempio l’organizzazione tonotopica discussa da Elberlinget al. e Romaniet al. Si presentano alcuni risultati di un calcolo numerico basato su un modello a cavo lineare e li si confronta con i risultati sperimentali.
    Notes: Summary In this paper we present some tentative model considerations, based on the concept of an equivalent current dipole to account for observed auditory evoked responses, with the aim of attempting a comparison of variations in amplitude and latency with calculations based on Rall’s greatly simplified nerve model. A phenomenological analysis of experimental data on the late, auditory evoked magnetic field from the human auditory cortex is presented. The emphasis is here placed on relations between signal properties (e.g. amplitude and latency) and between signal properties and stimulus properties (e.g. amplitude/latency and relative frequency glide Δf/f for a frequency glide stimulus) rather than on questions related to the location of the equivalent current dipole,e.g. the tonotopic organization discussed by Elberlinget al. and by Romaniet al.. Some results of a numerical calculation based on a linear-cable model are presented and compared with experimental results.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02455944
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    Studies of auditory evoked magnetic and electric responses: Modality specificity and modelling (1983)
    Springer
    Il nuovo cimento della Società Italiana di Fisica 2 (1983), S. 471-483 
    Details
    ISSN: 0392-6737
    Keywords: Biomagnetism (including magnetocardiography) ; Superconducting devices ; superconducting magnets
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Description / Table of Contents: Riassunto Le sorgenti di risposte uditive magnetiche ed electtriche stimolate sono state formate con dipoli a corrente multipli. L’attività a livello delle cortecce uditive, 2.6 cm al di sotto della calotta cranica, spiega la distribuzione di campo osservata $$\overline {N100m}$$ . Un’ulteriore sorgente di corrente vicino al vertice è necessaria per spiegare le corrispondenti distribuzioni di potenziale. La posizione delle sorgenti di corrente di $$\overline {N100m}$$ non ha mostrato alcuna dipendenza sistematica dalla frequenza tonale.
    Notes: Summary The sources of auditory evoked electric and magnetic responses were modelled with multiple current dipoles. The activity at the auditory cortices, 2.6 cm beneath the skull, explains the observed $$\overline {N100m}$$ field distribution. An additional current source near the vertex is needed to explain the corresponding potential distributions. The locations of the current sources of $$\overline {N100m}$$ did not show any systematic dependence on the tonal frequency.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02455946
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    Auditory evoked magnetic fields: a replication, with comments on the magneticP50 analog (1983)
    Springer
    Il nuovo cimento della Società Italiana di Fisica 2 (1983), S. 460-470 
    Details
    ISSN: 0392-6737
    Keywords: Biomagnetism (including magnetocardiography) ; Superconducting devices ; superconducting magnets
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Description / Table of Contents: Riassunto Sono stati registrati campi magnetici uditivi indotti (AEF) e potenziali uditivi indotti EEG (AEP) dalle regioni corticali uditive destra e sinistra di 12 soggetti normali adulti. Il sensore magnetico era un gradiometro SQUID a forma di otto con una linea di base di 4 cm orientato in modo da essere massimamente sensibile a un dipolo di corrente orientato perpendicolarmente alla fissure di Sylvio. Gli stimoli erano impulsi sonori di 1 kHz, lunghi 100 ms con un intervallo modale tra stimoli di 700 ms emessi a livelli di pressione sonora di 40, 60, 80 e 100 dB. Si è trovato che l’ampiezza AEF è correlata all’intensità dello stimolo in modo quadratico, l’ampiezza AEP in modo, lineare. Gli AEF erano di ampiezza maggiore in risposta alla stimolazione contralaterale che in risposta alla stimolazione ipsilaterale. Gli AEP non presentano questa relazione. In un secondo esperimento gli AEF e AEP dell’emisfero destro in risposta al tono di stimolazione nell’orecchio controlaterale in questi 12 soggetti sono stati combinati con dati simili precedenti su 24 soggetti, ottenendo cosí un totale di 36 soggetti, per esaminare la comparabilità della forma dell’onadaP50 di AEP e dell’analogaP50 di AEF. Si è trovato che la latenza dellaP50 decrese in funzione dell’intensità crescente dello stimolo sia per AEF che per AEP, e che la latenza diP50 è decisamente inferiore nelle registrazioni magnetiche rispetto alle registrazioni del potenziale.
    Notes: Summary Auditory evoked magnetic fields (AEFs) and EEG auditory evoked potentials (AEPs) were recorded from left and right auditory cortical regions of 12 normal adult subjects. The magnetic sensor was a figure-eight SQUID gradiometer with a 4 cm baseline oriented so as to be maximally sensitive to a current dipole oriented normal to the Sylvian fissure. Stimuli were 100 ms long 1 kHz tone pips with a modal interstimulus interval of 700 ms delivered at sound pressure levels of 40, 60, 80 and 100 dB. AEF amplitude was found to be related to stimulus intensity in a quadratic fashion, AEP amplitude in a linear fashion. AEFs were of larger amplitude in response to contralateral as compared to ipsilateral stimulation. AEPs did not exhibit such a relationship. In a second experiment right-hemisphere AEFs and AEPs in response to contralateral ear tone stimulation in these 12 subjects were combined with similar previous data from 24 subjects, providing a total of 36 subjects, to examine the comparability of the AEPP50 wave form and the AEFP50 analog. The latency of theP50 was found to decrease as a function of increasing stimulus intensity for both AEFs and AEPs, and theP50 latency was consistently shorter in magnetic compared to potential recordings.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02455945
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    Cerebral magnetic fields associated with voluntary limb movements in man (1983)
    Springer
    Il nuovo cimento della Società Italiana di Fisica 2 (1983), S. 484-494 
    Details
    ISSN: 0392-6737
    Keywords: Biomagnetism (including magnetocardiography) ; Superconducting devices ; superconducting magnets
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Description / Table of Contents: Riassunto I movimenti volontari degli arti sono preceduti da spostamenti MEG che cominciano già 1.2s prima del movimento. Questi spostamenti invertono la polarità sull’area di rappresentazione della corteccia motoria dell’arto in questione.
    Notes: Summary Voluntary limb movements are preceded by MEG shifts beginning even as early as 1.2 s before the movement. These shifts reverse polarity above the cortical motor representation area of the limb concerned.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02455947
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    Slow magnetic fields of the brain preceding movement and speech (1983)
    Springer
    Il nuovo cimento della Società Italiana di Fisica 2 (1983), S. 495-504 
    Details
    ISSN: 0392-6737
    Keywords: Biomagnetism (including magnetocardiography) ; Superconducting devices ; superconducting magnets
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Description / Table of Contents: Riassunto Sono stati registrati i campi magnetici del cervello che precedono i movimenti autonomi delle dita della mano, del piede e della dita del piede stesso, i movimenti delle dita della mano e del piede causati da uno stimolo e la parola. Sono stati trovati lenti spostamenti dei campi magnetici con morfologia simile ai coincidenti potenziali elettrici, ma con distribuzioni molto diverse. Si discutono le deduzioni ottenute dai dati sulla localizzazione dei generatori cerebrali.
    Notes: Summary Magnetic fields of the brain were recorded preceding selfinitiated finger, foot, toe movements, stimulus-triggered finger and toe movements, and speech. Slow magnetic-field shifts were found with morphology similar to coincident electrical potentials, but with very different distributions. Inferences from the data about localization of cerebral generators were discussed.
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    URL: http://dx.doi.org/10.1007/BF02455948
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    Magnetic fields associated with the brain’s response to infrequent events (1983)
    Springer
    Il nuovo cimento della Società Italiana di Fisica 2 (1983), S. 505-511 
    Details
    ISSN: 0392-6737
    Keywords: Biomagnetism (including magnetocardiography) ; Superconducting devices ; superconducting magnets
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Description / Table of Contents: Riassunto Si è studiato il campo magnetico prodotto dal cervello prendendo in considerazione una varietà di eventi rari. Si riporta il carattere temporale della risposta a un raro stimolo uditivo. Il campo magnetico appare offrire un’utile nuova sonda dell’attività endogena nel cervello umano.
    Notes: Summary We have studied the magnetic field produced by the brain when attending to a variety of rare events. The temporal character of the response to a rare auditory stimulus is reported. The magnetic field appears to offer a useful new probe of endogeneous activity in the human brain.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02455949
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    Magnetic study of the spontaneous brain activity of normal subjects (1983)
    Springer
    Il nuovo cimento della Società Italiana di Fisica 2 (1983), S. 538-546 
    Details
    ISSN: 0392-6737
    Keywords: Biomagnetism (including magnetocardiography) ; PACS. 85.25 ; Superconducting devices ; superconducting magnets
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Description / Table of Contents: Riassunto Uno studio sull’attività spontanea del cervello in soggetti normali è stato eseguito con il metodo neuromagnetico. Sono stati usate 2 diverse strumentazioni per le misure magnetiche. Ambedue usavano gradiometri di second’ordine disegnati specificatamente per gli studi sul cervello: 2.9 cm di diametro, 5 cm di baseline. Uno SQUID r.f. e uno SQUID d.c. erano accoppiati ai gradiometri. I livelli di rumore misurati sono stati rispettivamente di $$40fT/\sqrt {Hz}$$ e $$25fT/\sqrt {Hz}$$ . In alcuni soggetti sono state effettuate mappe di campi magnetici generati dall’attività spontanea del cervello. Le mappe dell’ampiezza media dei segnali del ritmo α hanno mostrato 2 massimi dell’attività su 2 regioni simmetriche dello scalpo. Comunque, malgrado una generale simmetria fra gli emisferi, la complessità delle mappe misurate suggerisce una corrispondente complessità dei generatori responsabili dell’attività α.
    Notes: Summary An investigation of the spontaneous brain activity from normal subjects has been carried out by means of the neuromagnetic method. Two different systems were used for magnetic measurements. Both used 2nd-order gradiometers specifically designed for brain studies: 2.9 cm diameter, 5 cm baseline. A r.f. SQUID and a d.c. SQUID were coupled to the gradiometers. The measured noise levels are $$40fT/\sqrt {Hz}$$ and $$25fT/\sqrt {Hz}$$ , respectively. Thorough magnetic mapping of the spontaneous activity was performed on a few subjects. By mapping the average amplitude of the α-rhythm signals two maxima of activity over two symmetric regions of the scalp were clearly observed. Despite a general symmetry between hemispheres, however, the complexity of the measured maps suggests a corresponding complexity of the generators responsible for α-activity.
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    URL: http://dx.doi.org/10.1007/BF02455952
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    Magnetic sensors with good signal-to-interference discrimination (1983)
    Springer
    Il nuovo cimento della Società Italiana di Fisica 2 (1983), S. 153-165 
    Details
    ISSN: 0392-6737
    Keywords: Biomagnetism (including magnetocardiography) ; Superconducting devices ; superconducting magnets
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Description / Table of Contents: Riassunto Si stabiliscono princípi per il progetto di sistemi di spire che generano campi magnetici distanti che diminuiscono secondo una potenza inversa alta della distanza. Secondo un principio di reciprocità queste disposizioni, quando usate come sensori in magnetometri ad induzione e SQUID, hanno una sensibilità intrinsecamento bassa per sorgenti distanti del campo magnetico.
    Notes: Summary Principles are established for the design of coil arrays which generate distant magnetic fields diminishing as a high inverse power of the distance. By a principle of reciprocity these arrays, when used as sensors in induction and SQUID magnetometers, have an inherently low sensitivity to distant sources of magnetic field.
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    URL: http://dx.doi.org/10.1007/BF02455919
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    Measurement of biomagnetic fields using multichannel superconducting-magnetometer techniques (1983)
    Springer
    Il nuovo cimento della Società Italiana di Fisica 2 (1983), S. 166-174 
    Details
    ISSN: 0392-6737
    Keywords: Biomagnetism (including magnetocardiography) ; Superconducting devices ; superconducting magnets
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Description / Table of Contents: Riassunto Si è costruito un magnetometro SQUID differenziale a 3 canali per la misurazione simultanea delle 3 componenti ortogonali del campo magnetico nella stessa posizione. Si descrive la struttura dell’apparecchio e si mostrano i dati MCG misurati. Si discutono gli effetti d’interferenza tra i canali.
    Notes: Summary We have constructed a three-channel differential SQUID magnetometer for the simultaneous measurement of the three orthogonal components of the magnetic field in the same location. The structure of the device is described and MCG data measured are shown. Interference effects between the channels are discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02455920
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    Instrumentation for biomagnetism (1983)
    Springer
    Il nuovo cimento della Società Italiana di Fisica 2 (1983), S. 123-141 
    Details
    ISSN: 0392-6737
    Keywords: Biomagnetism (including magnetocardiography) ; Superconducting devices ; superconducting magnets
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Description / Table of Contents: Riassunto Si riesamina la strumentalizzazione adatta all’acquisizione di segnali biomagnetici. Si studiano separatamente i componenti di base del magnetometro, cioè gli SQUID, i trasformatori di flusso e i dewar. Si discutono i possibili miglioramenti alla strumentazione attuale e alle apparecchiature complete comprendenti scudi ferromagnetici o di correnti a vortice e si valuta la loro efficenza.
    Notes: Summary The instrumentation suitable for the acquisition of biomagnetic signals is reviewed. The basic magnetometer components,i.e. SQUIDs, flux transformers and dewars, are studied separately. Possible improvements to the present instrumentation as well as complete set-ups including ferromagnetic or eddy current shields are discussed and their efficiency evaluated.
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    URL: http://dx.doi.org/10.1007/BF02455917
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    Effect of hydrocortisone on the phenotypic expression and inheritance of the Fused gene in mice (1983)
    Springer
    Theoretical and applied genetics 64 (1983), S. 275-281 
    Details
    ISSN: 1432-2242
    Keywords: Fused gene ; Mice ; Hydrocortisone ; Gene inactivation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary This study was undertaken to examine the effects of hydrocortisone injected into male mice on the phenotypic expression and inheritance of the Fused (Fu) gene in their offspring. Data were obtained indicating that there is a hydrocortisone-susceptible period during spermatogenesis. Hydrocortisone injections of males during this period resulted in a statistically significant decrease in the proportion of phenotypically Fu offspring. Genetic analysis with the use of the closely linked recessive marker tufted (tf) demonstrated that the deficit of phenotypically Fu individuals among offspring is not caused by the differential death of gametes, zygotes or embryos. According to genetic data, this deficit is due to a decrease in the penetrance of the Fu gene and partly to its inherited inactivation. The possible mechanisms of the observed phenomenon are discussed.
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    URL: http://dx.doi.org/10.1007/BF00274161
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    Homeostasis of the antibody response: immunoregulation by NK cells (1983)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1983-11-11
    Description: When injected into mice, the synthetic double-stranded polynucleotide poly(inosinic) X poly(cytidylic) acid induces high natural killer (NK) cell activity within 4 to 12 hours. Induction of NK activity in mice immunized 2 or 3 days previously, or the addition of NK cells to cultures immunized in vitro 2 or 3 days previously, promotes early termination of the ongoing primary immunoglobulin M antibody response. A target for NK cells is a population of accessory cells that has interacted with antigen and is necessary for sustaining the antibody response. The inference is strong that NK cells induced normally by immunization also terminate the usual antibody response in vivo by elimination of antigen-exposed accessory cells.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Abruzzo, L V -- Rowley, D A -- 5-T32-CA-09267/CA/NCI NIH HHS/ -- R01-10242/PHS HHS/ -- New York, N.Y. -- Science. 1983 Nov 11;222(4624):581-5.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/6685343" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; *Antibody Formation ; Antibody-Producing Cells/immunology ; Cells, Cultured ; Homeostasis ; Killer Cells, Natural/*immunology/radiation effects ; Lymphocyte Cooperation ; Lymphocytes/*immunology ; Mice ; Poly I-C/immunology ; Spleen/immunology
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
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    Primary murine bone marrow cultures support continuous growth of infectious human trypanosomes (1983)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1983-04-22
    Description: The human parasite Trypanosoma brucei gambiense grew continuously at 37 degrees C in primary cultures of murine bone marrow. Cultured parasites remained virulent for mice. Rapid parasite growth coincided with the appearance of adherent adipocyte-epitheloid cell aggregates that also promoted hematopoiesis. This culture system should permit studies of host cell control of trypanosome proliferation, pathogenic effects of trypanosomes on blood cell development, and the relative trypanocidal and marrow suppressive activities of drugs.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Balber, A E -- CA 14049/CA/NCI NIH HHS/ -- New York, N.Y. -- Science. 1983 Apr 22;220(4595):421-3.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/6836284" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; *Bone Marrow ; Cells, Cultured ; Culture Media ; Humans ; Mice ; Mice, Inbred BALB C ; Trypanosoma brucei brucei/growth & development ; Trypanosoma brucei gambiense/*growth & development ; Trypanosomiasis, African/parasitology
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
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    Independent pathways for secretion of cholesterol and apolipoprotein E by macrophages (1983)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1983-02-18
    Description: Cholesterol-loaded macrophages secrete cholesterol and apolipoprotein E. The current studies show that this secretion occurs by two independent pathways. In the absence of serum, the cells secrete apolipoprotein E, but not cholesterol. In the presence of monensin (an inhibitor of protein secretion), the cells secrete cholesterol, but little apolipoprotein E. After secretion, apolipoprotein E and cholesterol associate with high-density lipoprotein to form a particle that can deliver cholesterol to the liver by receptor-mediated endocytosis. We conclude that apolipoprotein E does not function to remove cholesterol from macrophages but rather to participate in "reverse cholesterol transport."〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Basu, S K -- Goldstein, J L -- Brown, M S -- HL 20948/HL/NHLBI NIH HHS/ -- New York, N.Y. -- Science. 1983 Feb 18;219(4586):871-3.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/6823554" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Apolipoproteins/*secretion ; Cholesterol/*secretion ; Lipoproteins, HDL/metabolism ; Macrophages/*metabolism ; Mice ; Monensin/pharmacology
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
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    A polypeptide secreted by transformed cells that modulates human plasminogen activator production (1983)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1983-07-08
    Description: A diffusible factor produced and secreted by malignant murine cells was capable of inducing plasminogen activator production by normal diploid human fibroblasts. The factor's ability to induce plasminogen activator was insensitive to treatment with nucleases, but its activity was destroyed by digestion with proteases. It is proposed that such a factor would play a role in malignancy if it would recruit normal cells that were adjacent to transformed cells to produce plasminogen activator which could result in tumor-promoted proteolysis.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Davies, R L -- Rifkin, D B -- Tepper, R -- Miller, A -- Kucherlapati, R -- CA-16239/CA/NCI NIH HHS/ -- CA-35171/CA/NCI NIH HHS/ -- New York, N.Y. -- Science. 1983 Jul 8;221(4606):171-3.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/6682999" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Cricetinae ; Fibroblasts/drug effects/metabolism ; Humans ; Hybrid Cells/metabolism ; Melanoma/metabolism ; Mice ; Neoplasms, Experimental/*metabolism/secretion ; Peptides/pharmacology/*secretion ; Plasminogen Activators/*biosynthesis ; Rats
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
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    Scientist sues over genetically impure mice (1983)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1983-08-12
    Description: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Fox, J L -- New York, N.Y. -- Science. 1983 Aug 12;221(4611):625-8.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/6603019" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; *Animals, Laboratory ; Jurisprudence ; Mice ; *Mice, Inbred BALB C ; Rats ; Rats, Inbred Lew ; Rats, Inbred Strains ; Research ; United States ; Wisconsin
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
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    Adenosine receptors: autoradiographic evidence for their location on axon terminals of excitatory neurons (1983)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1983-05-27
    Description: Adenosine receptors were made visible on light microscopy by autoradiography with tritiated cyclohexyladenosine. In the cerebellum, adenosine receptors were absent in Weaver mice, which lack granule cells, and were displaced in Reeler mice, which have displacements of granule cells. Thus, adenosine receptors appear to be located on the axon terminals of excitatory granule cells in the cerebellum. Removal of one eye of a rat depleted adenosine receptors in the contralateral superior colliculus, suggesting that the receptors occur on axon terminals of excitatory projections from retinal ganglion cells. The presence of adenosine receptors on excitatory axon terminals may explain synaptic inhibition by adenosine and the behavioral effects of xanthines.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Goodman, R R -- Kuhar, M J -- Hester, L -- Snyder, S H -- DA-00266/DA/NIDA NIH HHS/ -- MH-18501/MH/NIMH NIH HHS/ -- NS-16375/NS/NINDS NIH HHS/ -- etc. -- New York, N.Y. -- Science. 1983 May 27;220(4600):967-9.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/6302841" target="_blank"〉PubMed〈/a〉
    Keywords: Adenosine/*physiology ; Animals ; Autoradiography ; Axons/*physiology ; Cerebellum/physiology ; Corpus Striatum/physiology ; Hippocampus/physiology ; Mice ; Mice, Neurologic Mutants ; Rats ; Rats, Inbred Strains ; Receptors, Cell Surface/*physiology ; Receptors, Purinergic ; Retinal Ganglion Cells/physiology ; Synaptic Membranes/physiology ; Thalamus/physiology
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
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    High efficiency DNA-mediated transformation of primate cells (1983)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1983-08-05
    Description: Tissue culture cells from several mammalian species, including three primate lines, were transfected with recombinant vectors carrying Escherichia coli xanthine-guanine phosphoribosyltransferase or Tn5 aminoglycoside phosphotransferase dominant selectable markers. Human HeLa and SV40-transformed xeroderma pigmentosum cells exhibited stable transformation frequencies of at least 10(-3) (0.1 percent). CV-1, an African green monkey kidney cell line, could be stably transformed with the exceptionally high frequency of 6 X 10(-2) (6 percent).〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Gorman, C -- Padmanabhan, R -- Howard, B H -- New York, N.Y. -- Science. 1983 Aug 5;221(4610):551-3.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/6306768" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Avian Sarcoma Viruses/genetics ; Cell Line ; Cercopithecus aethiops ; Cricetinae ; Cricetulus ; DNA, Recombinant/*metabolism ; Genetic Vectors ; HeLa Cells/metabolism ; Humans ; Mice ; Plasmids ; *Transfection
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    Somatic mutations of immunoglobulin variable genes are restricted to the rearranged V gene (1983)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1983-06-10
    Description: An important question concerning the mechanism of somatic mutation of immunoglobulin variable (V) genes is whether it involves all of the numerous V genes in a differentiated B cell, independent of location, or if it is restricted to a particular chromosomal site. Comparison of the sequence of two alleles of a given V gene shows that the mutations are limited to the rearranged V gene, while the same V gene on the other chromosome has not undergone mutation. This indicates that a V gene sequence alone is not sufficient for somatic mutation to take place. The mutation is therefore restricted to the rearranged V gene and consequently does not occur before rearrangement.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Gorski, J -- Rollini, P -- Mach, B -- New York, N.Y. -- Science. 1983 Jun 10;220(4602):1179-81.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/6857243" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Base Sequence ; Binding Sites, Antibody/*genetics ; Chromosomes/physiology ; DNA/genetics ; *Genes ; Immunoglobulin Constant Regions/genetics ; Immunoglobulin Variable Region/*genetics ; Immunoglobulins/genetics ; Lymphocytes/metabolism ; Mice ; *Mutation
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    Isolation of lamellar bodies from neonatal mouse epidermis by selective sequential filtration (1983)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1983-09-02
    Description: Isolation of epidermal lamellar bodies has presented a challenge because pressures required to homogenize keratinocytes can destroy these organelles and because the lamellar body readily releases its contents during prolonged isolation procedures. In an attempt to isolate lamellar bodies, sheets of intact stratum corneum and stratum granulosum were obtained from neonatal mice with highly purified staphylococcal epidermolytic toxin, disrupted, and passed through a series of filters. The final filtrate was rich in intact lamellar bodies and contained variable amounts of ribosomes and other vesicular structures. Availability of a highly purified lamellar body preparation from postnatal epidermis should help to clarify the role of this organelle in epidermal function. The technique of selective, sequential filtration represents a new approach to cell fractionation that may have wide applications in cell biology and biochemistry.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Grayson, S -- Johnson-Winegar, A D -- Elias, P M -- AM 19098/AM/NIADDK NIH HHS/ -- New York, N.Y. -- Science. 1983 Sep 2;221(4614):962-4.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/6879194" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Cell Fractionation/methods ; Epidermis/*ultrastructure ; Filtration ; Mice ; Microscopy, Electron
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    Virus-induced autoimmunity: monoclonal antibodies that react with endocrine tissues (1983)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1983-04-15
    Description: Mice infected with reovirus type 1 develop an autoimmune polyendocrine disease. Spleen cells from these mice were fused with myeloma cells and the culture fluids were screened by indirect immunofluorescence for autoantibodies reactive with normal mouse tissues. A large panel of cloned, stable antibody-producing hybridomas has been obtained. Fourteen of the hybridomas make autoantibodies that react with cells in the islets of Langerhans, 24 with cells in the anterior pituitary, 11 with cells in gastric mucosa, and 5 with nuclei. Except for the antibodies to nuclei, the monoclonal autoantibodies are organ-specific. Some, however, show broad cross-species reactivity, recognizing similar antigenic determinants in mouse, rat, pig, and human organs, whereas other recognize determinants only in rodent tissues. Several of the antigens recognized by these monoclonal autoantibodies have been identified as hormones (for example, glucagon, growth hormone, and insulin).〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Haspel, M V -- Onodera, T -- Prabhakar, B S -- Horita, M -- Suzuki, H -- Notkins, A L -- New York, N.Y. -- Science. 1983 Apr 15;220(4594):304-6.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/6301002" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Antibodies, Monoclonal/*immunology ; Autoantibodies/immunology ; Autoimmune Diseases/immunology/*microbiology ; Endocrine Glands/*immunology ; Enzyme-Linked Immunosorbent Assay ; Growth Hormone/immunology ; Humans ; Hybridomas/immunology ; Mice ; Pituitary Gland, Anterior/immunology ; Rats ; Reoviridae Infections/*immunology
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    Contiguity to males in utero affects avoidance responding in adult female mice (1983)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1983-04-22
    Description: Female mice that had been situated in utero between two female fetuses displayed higher levels of active avoidance responding in adult life than females that had been located between two male fetuses and males for whom uterine position was without effect. Uterine position, therefore, influences acquired as well as species-typical behaviors.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Hauser, H -- Gandelman, R -- New York, N.Y. -- Science. 1983 Apr 22;220(4595):437-8.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/6836288" target="_blank"〉PubMed〈/a〉
    Keywords: Androgens/physiology ; Animals ; Avoidance Learning/*physiology ; Female ; Fetus/*physiology ; Male ; Mice ; Pregnancy ; Rats ; Sex Factors ; Uterus
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    Simple repeat array in Epstein-Barr virus DNA encodes part of the Epstein-Barr nuclear antigen (1983)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1983-06-24
    Description: The size of the Epstein-Barr virus (EBV) nuclear antigen (EBNA) in cells infected with different EBV isolates varies directly with the size of the EBV triplet repeat array, IR3. The isolate with the largest IR3 fragment has approximately 170 more codons than the isolates with the smallest IR3 fragment; it encodes an EBNA which is approximately 17,000 daltons larger than the smallest EBNA. The EBV IR3 encodes part of a 2-kilobase exon of a latently infected cell messenger RNA which must be translated into a repetitive amino acid domain of EBNA.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Hennessy, K -- Heller, M -- van Santen, V -- Kieff, E -- CA 17281/CA/NCI NIH HHS/ -- CA 19264/CA/NCI NIH HHS/ -- GM 07183/GM/NIGMS NIH HHS/ -- etc. -- New York, N.Y. -- Science. 1983 Jun 24;220(4604):1396-8.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/6304878" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Antigens, Viral/*genetics ; Base Sequence ; Cell Nucleus/immunology ; DNA, Viral/*genetics ; Epstein-Barr Virus Nuclear Antigens ; Herpesvirus 4, Human/*genetics/immunology ; Humans ; Mice ; RNA, Viral/genetics
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    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
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    Radioactive labeling of antibody: a simple and efficient method (1983)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1983-05-06
    Description: A simple and efficient method of covalently coupling the strong chelator diethylenetriaminepentaacetic acid to proteins was developed for radiolabeling immunoglobulin G antibodies. After being coupled and labeled with indium-111, a monoclonal antibody to carcinoembryonic antigen retained its ability to bind to its antigen in vitro and in vivo. In nude mice with a human colorectal xenograft, 41 percent of the injected radioactivity became localized in each gram of xenograft at 24 hours compared with 9 percent for control antibody and 19 percent for radioiodinated antibody to carcinoembryonic antigen.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Hnatowich, D J -- Layne, W W -- Childs, R L -- Lanteigne, D -- Davis, M A -- Griffin, T W -- Doherty, P W -- 1 RO1 CA26968/CA/NCI NIH HHS/ -- 1 RO1 GM26780/GM/NIGMS NIH HHS/ -- New York, N.Y. -- Science. 1983 May 6;220(4597):613-5.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/6836304" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; *Antibodies ; Antibodies, Monoclonal/immunology ; Carcinoembryonic Antigen/immunology ; Chromatography, High Pressure Liquid ; Humans ; Immunoglobulin G/immunology ; Isotope Labeling/*methods ; Mice ; Mice, Inbred BALB C ; Mice, Nude ; Neoplasm Transplantation ; Pentetic Acid
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    Synthesizing the opioid peptides (1983)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1983-04-22
    Description: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Marx, J L -- New York, N.Y. -- Science. 1983 Apr 22;220(4595):395-7.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/6836282" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Aplysia/physiology ; Endorphins/*biosynthesis/genetics ; Humans ; Mice ; Nervous System Physiological Phenomena ; Pituitary Hormones, Anterior/biosynthesis/genetics ; Pro-Opiomelanocortin ; Protein Precursors/biosynthesis/genetics ; RNA, Messenger/metabolism ; Rats
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    Suppressing autoimmunity in mice (1983)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1983-08-26
    Description: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Marx, J L -- New York, N.Y. -- Science. 1983 Aug 26;221(4613):843-5.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/6576470" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Antibodies, Monoclonal ; Autoimmune Diseases/*therapy ; Histocompatibility Antigens Class II/immunology ; Immune Tolerance ; Isoantibodies ; Mice ; Myasthenia Gravis/therapy
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    Selective modification of glutathione metabolism (1983)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1983-04-29
    Description: Glutathione, a tripeptide thiol found in virtually all cells, functions in metabolism, transport, and cellular protection. It participates in the reduction of disulfides and other molecules, and conjugates with compounds of exogenous and endogenous origin. It protects cells against the destructive effects of reactive oxygen intermediates and free radicals. Modifications of glutathione metabolism may be achieved by administration of selective enzyme inhibitors, and also by giving compounds that increase glutathione synthesis. Such effects are useful in chemotherapy and radiation therapy and in protecting cells against the toxic effects of drugs, other foreign compounds, and oxygen.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Meister, A -- New York, N.Y. -- Science. 1983 Apr 29;220(4596):472-7.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/6836290" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Biological Transport ; Free Radicals ; Glutathione/analogs & derivatives/biosynthesis/*metabolism/physiology ; Glutathione Disulfide ; Glutathione Synthase/deficiency/metabolism ; Humans ; Leukemia L1210/metabolism ; Mice ; Oxidation-Reduction ; Peroxides/metabolism ; Pyroglutamate Hydrolase/metabolism ; Trypanosoma brucei brucei/metabolism
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    Drug-induced alterations of cytokeratin organization in cultured epithelial cells (1983)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1983-02-04
    Description: The distribution of keratin intermediate filaments, previously considered static in organization and imperturbable by conventional drugs used to alter the structure and organization of the cytoskeleton, can be altered significantly by treatment with colchicine and cytochalasin D. The loss of microfilaments and microtubules converts the keratin cytoskeleton from a branching, even distribution to a series of starlike structures whose filaments are maintained by multiple membrane attachment sites. These findings provide a means for manipulating cytokeratin organization to investigate the role of keratins in cytoskeletal structure and function.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Knapp, L W -- O'Guin, W M -- Sawyer, R H -- New York, N.Y. -- Science. 1983 Feb 4;219(4584):501-3.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/6186022" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Cells, Cultured ; Colchicine/*pharmacology ; Cytochalasin D ; Cytochalasins/*pharmacology ; Cytoskeleton/*drug effects ; Epithelium ; *Keratins ; Mice ; Microtubules/drug effects
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    Passive transfer of diabetes in the BB/W rat (1983)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1983-05-13
    Description: Severe diabetes with insulitis was produced in young diabetes-prone BB/W rats by passive transfer of concanavalin A-treated spleen cells from BB/W animals with acute diabetes. Spleen cells alone or in combination with lymph node cells were active in transferring disease.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Koevary, S -- Rossini, A -- Stoller, W -- Chick, W -- Williams, R M -- AM-25306/AM/NIADDK NIH HHS/ -- AM-30846/AM/NIADDK NIH HHS/ -- New York, N.Y. -- Science. 1983 May 13;220(4598):727-8.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/6836309" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Concanavalin A/pharmacology ; Diabetes Mellitus/etiology/*immunology ; Hyperglycemia/etiology/immunology ; Immunity, Cellular ; Mice ; Mice, Nude ; Rats ; Spleen/cytology/drug effects/transplantation ; Transplantation, Heterologous ; Transplantation, Homologous
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    Genetically obese mice: resistance to metastasis of B16 melanoma and enhanced T-lymphocyte mitogenic responses (1983)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1983-06-10
    Description: The metastasis of B16 melanoma cells differed significantly in obese (ob/ob) and lean (+/?) female mice of strain C57BL/6J. When the mice were inoculated subcutaneously with melanoma cells at 10 to 11 months of age, the primary tumor grew more slowly in obese than in lean littermates and the frequency of lung metastasis was greatly reduced. When the mice were injected with the cells at 4 to 7 months, the primary tumor grew at the same rate in obese and lean mice, but the obese mice again showed a significantly reduced frequency of lung metastasis. That this effect was related to an enhanced immunocompetence in obese mice was supported by the finding that splenic lymphocytes of ob/ob mice showed three times the proliferative response to the T-cell mitogen concanavalin A compared with the proliferative response of lean control mice. The ob/ob mouse may provide a model for the study of enhanced immunocompetence in obese individuals.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Thompson, C I -- Kreider, J W -- Black, P L -- Schmidt, T J -- Margules, D L -- New York, N.Y. -- Science. 1983 Jun 10;220(4602):1183-5.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/6602379" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Female ; Immunity, Innate ; Lung Neoplasms/immunology ; Male ; Melanoma/*immunology ; Mice ; Mice, Inbred C57BL ; *Mice, Obese ; Neoplasm Metastasis ; Neoplasm Transplantation ; Neoplasms, Experimental/immunology ; Rats ; Receptors, Glucocorticoid/physiology ; T-Lymphocytes/*physiology
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    Monoclonal antibodies reveal the structural basis of antibody diversity (1983)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1983-11-18
    Description: Hybridoma technology has made it possible to introduce into continuous culture normal antibody-forming cells and to obtain large amounts of the immunoglobulin produced by each of these cells. Examination of the structure of a number of monoclonal antibodies that react with a single antigen has provided new information on the structural basis of the specificity and affinity of antibodies. Comparisons of families of monoclonal antibodies derived from a single germ line gene revealed the importance of somatic mutation in generating antibody diversity. Monoclonal antibodies that react with variable regions of other monoclonals allow the further dissection and modulation of the immune response. Finally, the continued somatic instability of immunoglobulin genes in cultured antibody-forming cells makes it possible to determine the rate of somatic mutation and to generate mutant monoclonal antibodies that may be more effective serological reagents.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Teillaud, J L -- Desaymard, C -- Giusti, A M -- Haseltine, B -- Pollock, R R -- Yelton, D E -- Zack, D J -- Scharff, M D -- 5T32GM7288/GM/NIGMS NIH HHS/ -- AI05231/AI/NIAID NIH HHS/ -- AI10702/AI/NIAID NIH HHS/ -- New York, N.Y. -- Science. 1983 Nov 18;222(4625):721-6.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/6356353" target="_blank"〉PubMed〈/a〉
    Keywords: Amino Acid Sequence ; Animals ; Antibodies, Monoclonal/genetics/*immunology ; *Antibody Diversity ; Antibody Specificity ; Genes ; Hybridomas/immunology ; Immunoglobulin Idiotypes/immunology ; Immunoglobulin Variable Region/genetics ; Mice ; Mutation ; Protein Conformation ; Structure-Activity Relationship
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    Bone cell differentiation and growth factors (1983)
    American Association for the Advancement of Science (AAAS)
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    Publication Date: 1983-05-13
    Description: Bone morphogenetic protein and bone-derived growth factors are biochemical tools for research on induced cell differentiation and local mechanisms controlling cell proliferation. Bone morphogenetic protein irreversibly induces differentiation of perivascular mesenchymal-type cells into osteoprogenitor cells. Bone-derived growth factors are secreted by and for osteoprogenitor cells and stimulate DNA synthesis. Bone generation and regeneration are attributable to the co-efficiency of bone morphogenetic protein and bone-derived growth factors.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Urist, M R -- DeLange, R J -- Finerman, G A -- DEO2103-17/DE/NIDCR NIH HHS/ -- New York, N.Y. -- Science. 1983 May 13;220(4598):680-6.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/6403986" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; *Bone Development ; Bone Matrix/drug effects/physiology ; Bone Morphogenetic Proteins ; Bone Neoplasms/physiopathology ; Cattle ; Cell Differentiation ; DNA, Neoplasm/metabolism ; Dogs ; Growth Substances/*physiology ; Guinea Pigs ; Haplorhini ; Humans ; Insulin-Like Growth Factor II ; Mice ; *Osteogenesis ; Osteosarcoma/physiopathology ; Proteins/pharmacology/physiology ; Rabbits ; Rats
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    DNA methylation decreases in aging but not in immortal cells (1983)
    American Association for the Advancement of Science (AAAS)
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    Publication Date: 1983-06-03
    Description: When normal diploid fibroblasts from mice, hamsters, and humans were grown in culture, the 5-methylcytosine content of their DNA's markedly decreased. The greatest rate of loss of 5-methylcytosine residues was observed in mouse cells, which survived the least number of division. Immortal mouse cell lines had more stable rates of methylation.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Wilson, V L -- Jones, P A -- 1-T32-CA09320/CA/NCI NIH HHS/ -- R01-GM30892/GM/NIGMS NIH HHS/ -- New York, N.Y. -- Science. 1983 Jun 3;220(4601):1055-7.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/6844925" target="_blank"〉PubMed〈/a〉
    Keywords: 5-Methylcytosine ; *Aging ; Animals ; Cell Division ; Cell Line ; Cricetinae ; Cytosine/analogs & derivatives/metabolism ; DNA/metabolism/*physiology ; Fibroblasts/metabolism ; Humans ; Mesocricetus ; Methylation ; Mice ; Time Factors
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    Leukotrienes: mediators of immediate hypersensitivity reactions and inflammation (1983)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1983-05-06
    Description: Arachidonic acid plays a central role in a biological control system where such oxygenated derivatives as prostaglandins, thromboxanes, and leukotrienes are mediators. The leukotrienes are formed by transformation of arachidonic acid into an unstable epoxide intermediate, leukotriene A4, which can be converted enzymatically by hydration to leukotriene B4, and by addition of glutathione to leukotriene C4. This last compound is metabolized to leukotrienes D4 and E4 by successive elimination of a gamma-glutamyl residue and glycine. Slow-reacting substance of anaphylaxis consists of leukotrienes C4, D4, and E4. The cysteinyl-containing leukotrienes are potent bronchoconstrictors, increase vascular permeability in postcapillary venules, and stimulate mucus secretion. Leukotriene B4 causes adhesion and chemotactic movement of leukocytes and stimulates aggregation, enzyme release, and generation of superoxide in neutrophils. Leukotrienes C4, D4, and E4, which are released from the lung tissue of asthmatic subjects exposed to specific allergens, seem to play a pathophysiological role in immediate hypersensitivity reactions. These leukotrienes, as well as leukotriene B4, have pro-inflammatory effects.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Samuelsson, B -- New York, N.Y. -- Science. 1983 May 6;220(4597):568-75.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/6301011" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Arachidonic Acids/metabolism/pharmacology/physiology ; Bronchi/drug effects ; Cats ; Chemical Phenomena ; Chemistry ; Cricetinae ; Guinea Pigs ; Haplorhini ; Humans ; Hypersensitivity, Immediate/*physiopathology ; Inflammation/*physiopathology ; Leukocytes/drug effects/metabolism ; Leukotriene B4/pharmacology/*physiology ; Mice ; Microcirculation/drug effects ; Rabbits ; Rats ; SRS-A/*physiology
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    Structure of a mouse submaxillary messenger RNA encoding epidermal growth factor and seven related proteins (1983)
    American Association for the Advancement of Science (AAAS)
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    Publication Date: 1983-07-15
    Description: The structure of the messenger RNA (mRNA) encoding the precursor to mouse submaxillary epidermal growth factor (EGF) was determined from the sequence of a set of overlapping complementary DNA's (cDNA). The mRNA is unexpectedly large, about 4750 nucleotide bases, and predicts the sequence of preproEGF, a protein of 1217 amino acids (133,000 molecular weight). The EGF moiety (53 amino acids) is flanked by polypeptide segments of 976 and 188 amino acids at its amino and carboyxl termini, respectively. The amino terminal segment of the precursor contains seven peptides with sequences that are similar but not identical to EGF.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Scott, J -- Urdea, M -- Quiroga, M -- Sanchez-Pescador, R -- Fong, N -- Selby, M -- Rutter, W J -- Bell, G I -- 21344/PHS HHS/ -- New York, N.Y. -- Science. 1983 Jul 15;221(4607):236-40.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/6602382" target="_blank"〉PubMed〈/a〉
    Keywords: Amino Acid Sequence ; Animals ; Base Sequence ; Epidermal Growth Factor/biosynthesis/*genetics ; Humans ; Male ; Mice ; RNA, Messenger/*genetics ; Submandibular Gland/metabolism
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  • 73
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    Atypical pulmonary thrombosis caused by a toxic cyanobacterial peptide (1983)
    American Association for the Advancement of Science (AAAS)
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    Publication Date: 1983-06-24
    Description: Parenteral injection into mice of a toxic pentapeptide isolated from the cyanobacterium Microcystis aeruginosa induced thrombocytopenia, pulmonary thrombi, and hepatic congestion. The lethality of the toxin was unaffected by several anticoagulants. The acute liver damage that follows injection of the toxin has been attributed to direct action on liver cells but may be due to hypoxemia, heart failure, and shock.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Slatkin, D N -- Stoner, R D -- Adams, W H -- Kycia, J H -- Siegelman, H W -- New York, N.Y. -- Science. 1983 Jun 24;220(4604):1383-5.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/6407109" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; *Bacterial Toxins ; Blood Coagulation Tests ; Cyanobacteria/*metabolism ; Female ; Liver/pathology ; Lung/pathology ; Marine Toxins/*adverse effects ; Mice ; Organ Size/drug effects ; Platelet Count ; Pulmonary Embolism/*chemically induced/microbiology/pathology ; Thrombocytopenia/chemically induced
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  • 74
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    Postnatally induced formation of the corpus callosum in acallosal mice on glia-coated cellulose bridges (1983)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1983-06-03
    Description: Developing axons of the corpus callosum of mice are guided across the cerebral midline by a slinglike glial structure that forms transiently between the hemispheres. If the "sling" is cut at precallosal stages, the would-be callosal fibers whirl into paired neuromas adjacent to the longitudinal cerebral fissure. In experiments on such surgically acallosal animals, the aberrant commissural axons maintained a potential to regrow across the hemispheres at prenatal and early postnatal stages if they were presented with a properly aligned, glia-covered scaffold spanning the hemispheres.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Silver, J -- Ogawa, M Y -- NS-15731/NS/NINDS NIH HHS/ -- New York, N.Y. -- Science. 1983 Jun 3;220(4601):1067-9.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/6844928" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Axons/physiology ; Brain/embryology/physiology ; Cellulose ; Corpus Callosum/embryology/*growth & development ; Embryo, Mammalian/physiology ; Fetus/physiology ; Mice ; Mice, Inbred BALB C ; Mice, Inbred C57BL ; Neuroglia/physiology
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  • 75
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    Recombination during gene transfer into mouse cells can restore the function of deleted genes (1983)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1983-01-14
    Description: Two plasmids containing nonoverlapping deletions of the herpes simplex virus thymidine kinase gene were introduced into thymidine kinase-deficient mouse L cells by DNA-mediated gene transfer. Thymidine kinase-producing transformants were generated by a mixture of the two plasmids at a frequency significantly greater than that generated by either plasmid alone. Southern blot analyses demonstrated that functional thymidine kinase genes were generated by homologous recombination between the two deletion mutants.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Small, J -- Scangos, G -- New York, N.Y. -- Science. 1983 Jan 14;219(4581):174-6.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/6294829" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Base Sequence ; Cells, Cultured ; Chromosome Deletion ; *Genetic Engineering ; Mice ; Mutation ; *Plasmids ; *Recombination, Genetic ; Simplexvirus ; Thymidine Kinase/*genetics
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  • 76
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    Hemagglutinin variants of reovirus type 3 have altered central nervous system tropism (1983)
    American Association for the Advancement of Science (AAAS)
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    Publication Date: 1983-04-29
    Description: Variants of the Dearing strain of reovirus type 3 with antigenically altered hemagglutinin proteins are much less neurovirulent than the parental virus. When injected intracerebrally into mice these variants infected a subset of the brain neurons that were infected by the parental virus. When injected intraperitoneally, the variants did not spread to the brain. These results indicate that minor modifications of the reovirus hemagglutinin dramatically alter the ability of the virus to spread into and injure the central nervous system.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Spriggs, D R -- Bronson, R T -- Fields, B N -- NS-16998-01/NS/NINDS NIH HHS/ -- New York, N.Y. -- Science. 1983 Apr 29;220(4596):505-7.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/6301010" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Antibodies, Monoclonal/immunology ; Brain/pathology ; Brain Diseases/*microbiology/pathology ; Hemagglutination Tests ; Mammalian orthoreovirus 3/immunology/*pathogenicity ; Mice ; Reoviridae/*pathogenicity ; Reoviridae Infections/microbiology/pathology
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  • 77
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    Rapid degradation of "new" acetylcholine receptors at neuromuscular junctions (1983)
    American Association for the Advancement of Science (AAAS)
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    Publication Date: 1983-10-07
    Description: Acetylcholine receptors at innervated neuromuscular junctions are very stable, with half-lives reported to be 6 to 13 days. Their turnover is described as a first-order process, implying a single population of receptors. In this study, two subpopulations of acetylcholine receptors at normally innervated junctions have been identified. One has a rapid turnover rate with a half-life of 18.7 hours, similar to that of extrajunctional receptors, and the other has a slow turnover rate with a half-life of 12.4 days. The rapidly turned over subpopulation represents approximately 20 percent of the total junctional receptors. This finding may account for the discrepancies in previous reports of turnover rates and may explain the rapid reversibility in vivo of agents that "irreversibly" block acetylcholine receptors. This finding also implies that the synthesis rate of junctional acetylcholine receptors may be higher than previous estimates. The rapidly turned-over subpopulation may represent receptors that were newly inserted into the neuromuscular junction and that were not yet stabilized by an influence of the motor nerve.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Stanley, E F -- Drachman, D B -- 5 P01 NS10920/NS/NINDS NIH HHS/ -- 5 R01 HD04817/HD/NICHD NIH HHS/ -- New York, N.Y. -- Science. 1983 Oct 7;222(4619):67-9.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/6623057" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Bungarotoxins ; Diaphragm ; Kinetics ; Mice ; Neuromuscular Junction/*metabolism ; Receptors, Cholinergic/biosynthesis/classification/*metabolism ; Synaptic Membranes/metabolism
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    Bovine x mouse hybridomas that secrete bovine immunoglobulin G1 (1983)
    American Association for the Advancement of Science (AAAS)
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    Publication Date: 1983-04-29
    Description: The interspecific fusion of normal bovine lymphocytes with a nonsecreting mouse hybridoma produced stable cell lines secreting bovine immunoglobulins. One of these lines has continued to secrete immunoglobulin G1 (5 to 10 micrograms per milliliter) for over 16 months. The bovine x mouse hybrid cells can be expected to provide bovine monoclonal immunoglobulins for sequencing studies and for use as serological standards as well as to provide messenger RNA for cloning bovine immunoglobulin genes.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Srikumaran, S -- Guidry, A J -- Goldsby, R A -- New York, N.Y. -- Science. 1983 Apr 29;220(4596):522-4.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/6403985" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Antibodies, Monoclonal/biosynthesis ; Cattle ; Cell Line ; Hybridomas/*immunology ; Immunoglobulin G/*biosynthesis/immunology/isolation & purification ; Immunoglobulin Heavy Chains/immunology ; Immunoglobulin Light Chains/immunology ; Immunoglobulin M/immunology ; Mice ; Radioimmunoassay
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    Genes of the major histocompatibility complex in mouse and man (1983)
    American Association for the Advancement of Science (AAAS)
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    Publication Date: 1983-11-18
    Description: The genes of the major histocompatibility complex code for cell-surface molecules that play an important role in the generation of the immune response. These genes and molecules have been studied intensively over the last five decades by geneticists, biochemists, and immunologists, but only recently has the isolation of the genes by molecular biologists facilitated their precise characterization. Many surprising findings have been made concerning their structure, multiplicity, organization, function, and evolution.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Steinmetz, M -- Hood, L -- New York, N.Y. -- Science. 1983 Nov 18;222(4625):727-33.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/6356354" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Biological Evolution ; Chromosome Mapping ; Genes ; H-2 Antigens/*genetics ; HLA Antigens/*genetics ; Histocompatibility Antigens/genetics ; Humans ; *Major Histocompatibility Complex ; Mice ; Polymorphism, Genetic ; Protein Conformation
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  • 80
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    Serological visualization of interleukin 2 (1983)
    American Association for the Advancement of Science (AAAS)
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    Publication Date: 1983-06-10
    Description: Interleukin 2, a lymphokine that acts as a second signal of cellular immune response by way of its action as a T-cell growth factor, was morphologically identified by immunoperoxidase staining. With the use of a monoclonal antibody to interleukin 2 and several complex-forming antisera, the lymphokine was readily distinguished in cytocentrifuge preparations of peripheral blood leukocytes stimulated with a T-cell mitogen. When preparations of cloned interleukin 2 producer and responder cells were stained by the same procedures, discrete patterns of both responder and producer cell phenotypes were revealed. Interleukin 2 producer T cells exhibited a characteristic intense, ringlike cytoplasmic staining, whereas the responder cells (as exemplified by interleukin 2-dependent cell lines) exhibited a less intensive, spotlike membrane staining. In addition, intense membrane localization of interleukin 2, reminiscent of potential capping phenomena, could be observed in stained preparations of cloned responder cells.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Steinmann, G -- Conlon, P -- Hefeneider, S -- Gillis, S -- New York, N.Y. -- Science. 1983 Jun 10;220(4602):1188-90.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/6344215" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Antibodies, Monoclonal/immunology ; Cell Line ; Humans ; Immunoenzyme Techniques ; Interleukin-2/*physiology ; Leukocytes/physiology ; Mice ; T-Lymphocytes/physiology
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    Human macrophages armed with murine immunoglobulin G2a antibodies to tumors destroy human cancer cells (1983)
    American Association for the Advancement of Science (AAAS)
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    Publication Date: 1983-08-26
    Description: Macrophages isolated from tumor-bearing patients as well as cultured human monocytes express Fc receptors that cross-react strongly with murine immunoglobulins of the G2a but only slightly or not at all with the G1, G2b, or G3 subclasses. Such macrophages in the presence of murine immunoglobulin G2a monoclonal antibodies to tumors mediated the killing of tumor cells in vitro. These data suggest that monoclonal antibodies of the G2a subclass may be useful in the immunotherapy of human cancer.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Steplewski, Z -- Lubeck, M D -- Koprowski, H -- CA-10815/CA/NCI NIH HHS/ -- CA-21124/CA/NCI NIH HHS/ -- CA-25874/CA/NCI NIH HHS/ -- etc. -- New York, N.Y. -- Science. 1983 Aug 26;221(4613):865-7.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/6879183" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Antibodies, Monoclonal/*immunology ; Cells, Cultured ; Cytotoxicity, Immunologic ; Humans ; *Immunity, Cellular ; Immunoglobulin G/immunology ; Immunotherapy ; Macrophages/*immunology ; Mice ; Monocytes/immunology ; Neoplasms, Experimental/immunology/therapy ; Receptors, Fc/*immunology ; Species Specificity
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  • 82
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    Biogenesis of ornithine transcarbamylase in spfash mutant mice: two cytoplasmic precursors, one mitochondrial enzyme (1983)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1983-10-28
    Description: Extracts of liver from hemizygous affected mice with the X-linked spfash mutation have 5 to 10 percent of normal ornithine transcarbamylase (OTC) activity, yet the homogeneous enzyme isolated from these extracts is identical to that in controls. The OTC messenger RNA from mutant livers programs the synthesis of two distinct OTC precursor polypeptides--one normal in size, the other distinctly elongated. Both precursors are imported and proteolytically processed by mitochondria, but only the normal one is assembled into active trimer. This novel phenotype may result from a mutation in the structural gene for OTC leading, primarily, to aberrant splicing of OTC messenger RNA and, secondarily, to formation of a structurally altered precursor whose posttranslational pathway is ultimately futile because its mature mitochondrial form is not capable of assembly and functional expression.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Rosenberg, L E -- Kalousek, F -- Orsulak, M D -- AM 09527/AM/NIADDK NIH HHS/ -- New York, N.Y. -- Science. 1983 Oct 28;222(4622):426-8.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/6623083" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Genes ; Liver/enzymology ; Macromolecular Substances ; Mice ; Mice, Mutant Strains/genetics/physiology ; Mitochondria, Liver/enzymology ; Mutation ; Ornithine Carbamoyltransferase/*genetics ; Protein Precursors/genetics ; Protein Processing, Post-Translational ; RNA, Messenger/genetics
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  • 83
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    Deformed whiskers in mice infected with certain exogenous murine leukemia viruses (1983)
    American Association for the Advancement of Science (AAAS)
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    Publication Date: 1983-08-05
    Description: Mice infected at birth with replication competent Friend, Moloney, CasBr-M, C2S-M, and 1504-A murine leukemia viruses developed abnormalities of the vibrissae consisting of erratic curvature, shortening, and loss. A number of other virus strains, as well as endogenous AKR-type ecotropic virus and AKR-type, mink cell focus-inducing (MCF) viruses, did not produce these abnormalities. In mice with erythroid and myeloid leukemia, the perivibrissal sinus is the site of extramedullary hematopoiesis, but this did not appear to be the basis of the deformities. Genetic evidence indicated that newly arisen MCF-type recombinant viruses are involved in the pathogenesis of the abnormalities, at least with some of the virus systems studied.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Rowe, W P -- N01-AI-22673/AI/NIAID NIH HHS/ -- New York, N.Y. -- Science. 1983 Aug 5;221(4610):562-4.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/6306769" target="_blank"〉PubMed〈/a〉
    Keywords: AKR murine leukemia virus ; Animals ; Friend murine leukemia virus ; Hair/*pathology ; Leukemia Virus, Murine ; Leukemia, Experimental/*pathology ; Mice ; Mice, Inbred AKR ; Mice, Inbred C57BL ; Moloney murine leukemia virus
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    Biotinated probe containing a long-terminal repeat hybridized to a mouse colon tumor and normal tissue (1983)
    American Association for the Advancement of Science (AAAS)
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    Publication Date: 1983-12-23
    Description: The cloned complementary DNA pMCT-1, which contains an intracisternal A particle long-terminal repeat, is more highly expressed in a mouse colon tumor than in the normal mouse colon. In situ hybridization of biotin-substituted pMCT-1 to fixed frozen sections shows that expression of pMCT-1 is seen throughout the tumor and is highly heterogeneous on a cellular basis, while expression is undetectable in any cell in the normal colonic mucosa.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Royston, M E -- Augenlicht, L H -- CA 22367/CA/NCI NIH HHS/ -- CA 33383/CA/NCI NIH HHS/ -- New York, N.Y. -- Science. 1983 Dec 23;222(4630):1339-41.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/6689218" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Biotin ; Colon/*analysis ; Colonic Neoplasms/*genetics/pathology ; Dna ; Interphase ; Intestinal Mucosa/analysis ; Male ; Mice ; Mice, Inbred BALB C ; *Nucleic Acid Hybridization ; RNA, Neoplasm/*genetics ; Repetitive Sequences, Nucleic Acid ; *Transcription, Genetic
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    A cancer-associated lactate dehydrogenase is expressed in normal retina (1983)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1983-07-15
    Description: An unusual isozyme of lactate dehydrogenase, lactate dehydrogenase k, is found in high concentrations in cultured cells transformed by the Kirsten murine sarcoma virus and in many human cancer tissues. In experiments described here high levels of a lactate dehydrogenase k activity were detected in extracts of normal rodent retina. This activity had the same key properties as the human tumor isozyme, namely, a highly cathodic electrophoretic mobility and inhibition of enzymatic activity by oxygen and 5',5'-dipurinenucleoside tetraphosphates. Expression of this activity in the retina may be related to the high aerobic glycolysis characteristic of the retina, a metabolic feature shared with many tumors.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Saavedra, R A -- Anderson, G R -- CA32022/CA/NCI NIH HHS/ -- GM28098/GM/NIGMS NIH HHS/ -- New York, N.Y. -- Science. 1983 Jul 15;221(4607):291-2.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/6857286" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Cell Transformation, Neoplastic/metabolism ; Chickens ; Electrophoresis ; Glycolysis ; Guinea Pigs ; Humans ; Isoenzymes ; L-Lactate Dehydrogenase/antagonists & inhibitors/*metabolism ; Mice ; Mice, Inbred Strains ; Neoplasms/*enzymology ; Oxygen/pharmacology ; Rats ; Retina/*enzymology
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  • 86
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    Human endometrial adenocarcinoma transplanted into nude mice: growth regulation by estradiol (1983)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1983-01-07
    Description: A model for studying the growth of primary tumors of human endometrium and its regulation by 17 beta-estradiol has been developed in which ovariectomized nude mice are used as recipients. The receptors for sex steroids are maintained during serial transplantation of the tumor in this system. Although the rate of growth of receptor-negative endometrial tumors transplanted into ovariectomized nude mice is unaffected by the sustained presence or absence of estradiol, the growth of receptor-positive tumors is significantly increased by estradiol. Receptor-positive tumors treated with estradiol produced elevated concentrations of progesterone receptor. That the progesterone receptor is functional in this tumor is evident from the induction of estradiol 17 beta-dehydrogenase activity upon progestin administration. These findings are consistent with receptor-mediated regulation of growth of endometrial carcinoma.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Satyaswaroop, P G -- Zaino, R J -- Mortel, R -- New York, N.Y. -- Science. 1983 Jan 7;219(4580):58-60.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/6849115" target="_blank"〉PubMed〈/a〉
    Keywords: Adenocarcinoma/metabolism/*pathology ; Animals ; Castration ; Estradiol/*physiology ; Female ; Mice ; Mice, Nude ; Neoplasm Transplantation ; Receptors, Estrogen/metabolism ; Receptors, Progesterone/metabolism ; Transplantation, Heterologous ; Uterine Neoplasms/metabolism/*pathology
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  • 87
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    Altered activity patterns during development reduce neural tuning (1983)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1983-09-16
    Description: Neonatal mice were reared in an acoustic environment that repetitively entrained activity in a large proportion of primary auditory afferents during the period when the frequency tuning of auditory neurons normally develops. The tuning curves obtained from these mice were significantly broader than those of normally reared mice of the same age. This suggests that the normal frequency tuning of neurons was prevented or delayed by synchronizing the pattern of activity imposed on the auditory pathway.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Sanes, D H -- Constantine-Paton, M -- 5T32GM07312/GM/NIGMS NIH HHS/ -- New York, N.Y. -- Science. 1983 Sep 16;221(4616):1183-5.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/6612332" target="_blank"〉PubMed〈/a〉
    Keywords: Acoustic Stimulation ; Animals ; Animals, Newborn ; Auditory Pathways/*physiology ; Evoked Potentials, Auditory ; Inferior Colliculi/physiology ; Mice ; Mice, Inbred C57BL ; Models, Neurological
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  • 88
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    Tumor cells secrete a vascular permeability factor that promotes accumulation of ascites fluid (1983)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1983-02-25
    Description: Tumor ascites fluids from guinea pigs, hamsters, and mice contain activity that rapidly increases microvascular permeability. Similar activity is also secreted by these tumor cells and a variety of other tumor cell lines in vitro. The permeability-increasing activity purified from either the culture medium or ascites fluid of one tumor, the guinea pig line 10 hepatocarcinoma, is a 34,000- to 42,000-dalton protein distinct from other known permeability factors.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Senger, D R -- Galli, S J -- Dvorak, A M -- Perruzzi, C A -- Harvey, V S -- Dvorak, H F -- New York, N.Y. -- Science. 1983 Feb 25;219(4587):983-5.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/6823562" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Ascites/physiopathology ; Ascitic Fluid/physiology ; *Capillary Permeability ; Cricetinae ; Guinea Pigs ; Mice ; Neoplasms, Experimental/*physiopathology
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  • 89
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    Bromine residue at hydrophilic region influences biological activity of aplysiatoxin, a tumor promoter (1983)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1983-12-16
    Description: Aplysiatoxin and debromoaplysiatoxin, which are isolated from the seaweed, Lyngbya gracilis, differ in their chemical structure only by the presence or absence of a bromine residue in the hydrophilic region. The function and the structure-activity relation of the hydrophilic region are not known. Aplysiatoxin increased malignant transformation, stimulated DNA synthesis, and inhibited the binding of phorbol-12,13-dibutyrate and epidermal growth factor to cell receptors. Debromoaplysiatoxin inhibited the binding of these two substances as strongly as aplysiatoxin but did not increase malignant transformation or stimulate DNA synthesis. These results indicate that a slight change in the chemical structure of the hydrophilic region of aplysiatoxin affects its abilities to increase cell transformation and stimulate DNA synthesis and that the abilities of the tumor promoters to inhibit the binding of phorbol-12,13-dibutyrate and epidermal growth factor are dissociable from their abilities to increase cell transformation and stimulate DNA synthesis under some circumstances.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Shimomura, K -- Mullinix, M G -- Kakunaga, T -- Fujiki, H -- Sugimura, T -- New York, N.Y. -- Science. 1983 Dec 16;222(4629):1242-4.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/6316505" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; *Caenorhabditis elegans Proteins ; Carcinogens/*pharmacology ; Carrier Proteins ; Cell Line ; Cell Transformation, Neoplastic/*drug effects ; Chemical Phenomena ; Chemistry ; DNA/biosynthesis ; Epidermal Growth Factor/metabolism ; Lactones/analysis/*pharmacology ; *Lyngbya Toxins ; Mice ; Phorbol 12,13-Dibutyrate ; Phorbol Esters/metabolism ; *Protein Kinase C ; Receptor, Epidermal Growth Factor ; Receptors, Cell Surface/metabolism ; *Receptors, Drug ; Structure-Activity Relationship
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  • 90
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    Thrombin stimulation of guanosine 3',5'-monophosphate formation in murine neuroblastoma cells (clone N1E-115) (1983)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1983-08-05
    Description: Thrombin, the central regulatory enzyme in coagulation, when incubated in nanomolar concentrations with murine neuroblastoma cells produced a rapid and marked increase in tritiated guanosine 3',5'-monophosphate (cyclic GMP) formation that was blocked by hirudin and competitively antagonized by dansylarginine N-(3-ethyl-1,5-pentanediyl)amide. Diisopropylphosphofluoridate-inactivated thrombin as well as the serine protease trypsin were markedly less potent and less effective than alpha-thrombin in producing this effect. Thrombin-stimulated cyclic GMP formation was inhibited by mepacrine and nordihydroguaiaretic acid but unaffected by indomethacin, suggesting that lipoxygenase metabolites of arachidonic acid are involved in the response. These results suggest that a thrombin-like protease in the brain may be involved with the function of neurons or that thrombin interactions with nerve cells, such as those following cerebral hemorrhage or other trauma of the central nervous system, may be important in the subsequent neuropathology.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Snider, R M -- Richelson, E -- HL07111/HL/NHLBI NIH HHS/ -- MH27692/MH/NIMH NIH HHS/ -- New York, N.Y. -- Science. 1983 Aug 5;221(4610):566-8.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/6306770" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Arginine/analogs & derivatives/pharmacology ; Blood Platelets/physiology ; Catechols/pharmacology ; Clone Cells ; Cyclic GMP/analysis/*biosynthesis ; *Dansyl Compounds ; Hirudins/pharmacology ; Indomethacin/pharmacology ; Masoprocol ; Mice ; Neuroblastoma/analysis/*metabolism ; Thrombin/analysis/*pharmacology ; Trypsin/analysis
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  • 91
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    X chromosome-linked transmission and expression of retroviral genomes microinjected into mouse zygotes (1983)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1983-08-19
    Description: A genomic clone consisting of the Moloney leukemia proviral genome with moderately repetitive mouse sequences was microinjected into the pronucleus of a mouse zygote. An animal was derived that carried multiple copies of proviral DNA in a tandem array. No evidence for homologous recombination was obtained. The viral genome was expressed in this animal and was transmitted as a single unit to its offspring. Subsequent breeding studies revealed that the proviral DNA had integrated on an X chromosome.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Stewart, C -- Harbers, K -- Jahner, D -- Jaenisch, R -- New York, N.Y. -- Science. 1983 Aug 19;221(4612):760-2.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/6683871" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Cell Nucleus/physiology ; Female ; Gene Expression Regulation ; Genes, Viral ; Mice ; Microinjections ; Moloney murine leukemia virus/*genetics ; Recombination, Genetic ; Sex Chromosomes/*physiology ; X Chromosome/*physiology
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  • 92
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    Stable antibody-producing murine hybridomas (1983)
    American Association for the Advancement of Science (AAAS)
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    Publication Date: 1983-03-11
    Description: A method is described for obtaining antibody-producing hybridomas that are preferentially retained in cultures of fused mouse spleen and myeloma cells. Hybridomas are produced by fusing mouse myeloma cells that are deficient in adenosine phosphoribosyltransferase (APRT) with mouse spleen cells containing Robertsonian 8.12 translocation chromosomes. The cell fusion mixtures are exposed to a culture medium that can be utilized only by APRT-positive cells, which results in the elimination of both unfused APRT-deficient myeloma cells and non-antibody-producing APRT-deficient hybridomas that arise by segregation of the 8.12 translocation chromosomes containing the APRT genes and the active heavy chain immunoglobulin gene.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Taggart, R T -- Samloff, I M -- 1 P01 CA 16042/CA/NCI NIH HHS/ -- New York, N.Y. -- Science. 1983 Mar 11;219(4589):1228-30.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/6402815" target="_blank"〉PubMed〈/a〉
    Keywords: Adenine Phosphoribosyltransferase/deficiency ; Animals ; Dosage Compensation, Genetic ; Hybridomas/*physiology ; Immunoglobulin Heavy Chains/genetics ; Mice ; Mice, Mutant Strains ; Selection, Genetic ; Translocation, Genetic
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  • 93
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    Fibronectin binds to some bacteria but does not promote their uptake by phagocytic cells (1983)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1983-04-08
    Description: The involvement of plasma fibronectin in phagocytosis of bacteria was investigated by testing the binding of fibronectin to several species of bacteria and by evaluating the ability of fibronectin to promote binding and endocytosis of two species of these bacteria by phagocytic cells. Fibronectin binds non-covalently to Gram-positive and Gram-negative bacteria and to yeast but did not appear to be necessary or sufficient for uptake of Staphylococcus aureus and Salmonella typhimurium by several different phagocytic cell types.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Van de Water, L -- Destree, A T -- Hynes, R O -- R01CA17007/CA/NCI NIH HHS/ -- New York, N.Y. -- Science. 1983 Apr 8;220(4593):201-4.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/6338594" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Bacteria/*metabolism ; Cell Line ; Cricetinae ; Endocytosis ; Fibronectins/*metabolism ; Humans ; Macrophages/physiology ; Mice ; Opsonin Proteins/physiology ; *Phagocytosis ; Rabbits ; Salmonella typhimurium/metabolism ; Sepsis/immunology ; Staphylococcus aureus/metabolism
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  • 94
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    Inhibition by alcohols of the localization of radioactive nitrosonornicotine in sites of tumor formation (1983)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1983-07-01
    Description: Oral administration of ethanol, n-butanol, or t-butanol to mice 20 minutes before injection of carbon-14-labeled nitrosonornicotine inhibited the localization of radioactivity in bronchial and salivary duct epithelium and in the liver. Localization of radioactivity in the nasal epithelium and esophagus was not significantly reduced. These alcohols therefore may selectively inhibit tumor formation in three of the five sites where this carcinogen typically acts.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Waddell, W J -- Marlowe, C -- New York, N.Y. -- Science. 1983 Jul 1;221(4605):51-3.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/6857261" target="_blank"〉PubMed〈/a〉
    Keywords: 1-Butanol ; Alcohol Drinking ; Alcohols/*pharmacology ; Animals ; Butanols/pharmacology ; Carcinogens/*antagonists & inhibitors ; Ethanol/pharmacology ; Humans ; Liver/drug effects ; Lung/drug effects ; Male ; Mice ; Mice, Inbred C57BL ; Neoplasms/*chemically induced ; Nitrosamines/*pharmacology ; Salivary Glands/drug effects ; Smoking ; tert-Butyl Alcohol
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  • 95
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    Cytotoxicity of a perfluorocarbon blood substitute to macrophages in vitro (1983)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1983-05-27
    Description: Murine macrophage and macrophage-depleted splenocyte cultures were incubated under ambient oxygen with a commercially available perfluorocarbon blood substitute. The perfluorocarbon preparation was found to be selectively cytotoxic to macrophages. This finding may be significant in view of the preliminary therapeutic usage of these preparations. In addition, perfluorocarbons may be useful as a means of selectively removing macrophages from tissue and organ cultures.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Bucala, R -- Kawakami, M -- Cerami, A -- New York, N.Y. -- Science. 1983 May 27;220(4600):965-7.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/6844922" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Blood Substitutes/*adverse effects ; Fluorocarbons/*adverse effects/pharmacology ; L-Lactate Dehydrogenase/metabolism ; Macrophages/*drug effects ; Mice
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  • 96
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    Ethanol modulation of opiate receptors in cultured neural cells (1983)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1983-12-16
    Description: The mouse neuroblastoma-rat glioma hybrid cell line NG108-15 was used to study the acute and chronic interaction of ethanol with intact neural cells. In the short term, ethanol inhibited opiate receptor binding, but after long-term exposure the cells exhibited an apparent adaptive increase in the number of opiate binding sites; this was reversible when ethanol was withdrawn. High concentrations of ethanol (200 mM) increased opiate binding after 18 to 24 hours, whereas lower concentrations (25 to 50 mM) produced similar changes after 2 weeks. This model system has potential for exploring the cellular and molecular mechanisms underlying ethanol intoxication, tolerance, and withdrawal.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Charness, M E -- Gordon, A S -- Diamond, I -- New York, N.Y. -- Science. 1983 Dec 16;222(4629):1246-8.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/6316506" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Cell Line ; Dose-Response Relationship, Drug ; Enkephalin, Methionine/analogs & derivatives/metabolism ; Ethanol/*pharmacology ; Glioma ; Hybrid Cells ; Mice ; Neuroblastoma ; Neurons/*drug effects/metabolism ; Rats ; Receptors, Opioid/*drug effects/metabolism ; Time Factors
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  • 97
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    Frequent activation of c-kis as a transforming gene in fibrosarcomas induced by methylcholanthrene (1983)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1983-05-27
    Description: The DNA's from two of four methylcholanthrene-induced mouse fibrosarcomas contained transforming genes that were identical in their pattern of restriction endonuclease resistance to inactivation of biologic activity. This transforming gene was identified as the activated homolog of the Kirsten murine sarcoma virus onc gene, v-kis. The finding that a defined carcinogen reproducibly leads to activation of kis as a transforming gene should be of value in elucidating the role of oncogenes in the neoplastic process.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Eva, A -- Aaronson, S A -- New York, N.Y. -- Science. 1983 May 27;220(4600):955-6.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/6302839" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Cell Line ; Cell Transformation, Neoplastic/*drug effects ; DNA Restriction Enzymes ; DNA, Neoplasm/genetics ; Fibrosarcoma/chemically induced/*genetics ; Humans ; Methylcholanthrene/*pharmacology ; Mice ; Oncogenes/*drug effects ; Retroviridae/genetics ; Transfection
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  • 98
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    Murine I-A beta chain polymorphism: nucleotide sequences of three allelic I-A beta genes (1983)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1983-07-15
    Description: The polymorphism of immune response genes plays a critical role in determining the immune capabilities of a particular individual. The molecular nature of this polymorphism was studied by examining the structure of the coding portions of three alleles of the I-A beta chain gene, an immune response gene whose protein product constitutes a subunit of the I-A molecule. Comparison of the I-A beta chains encoded by these alleles revealed an amino acid sequence divergence of 5 to 8 percent. The differences were found to be a series of short alterations clustered in the amino terminal half of the polypeptide.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Choi, E -- McIntyre, K -- Germain, R N -- Seidman, J G -- AI18436/AI/NIAID NIH HHS/ -- New York, N.Y. -- Science. 1983 Jul 15;221(4607):283-6.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/6407114" target="_blank"〉PubMed〈/a〉
    Keywords: Alleles ; Amino Acid Sequence ; Animals ; Base Sequence ; *Genes, MHC Class II ; Histocompatibility Antigens Class II/immunology ; Humans ; Mice ; Mice, Inbred BALB C ; Mice, Inbred C57BL ; *Polymorphism, Genetic
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  • 99
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    Otosclerotic lesions in the inbred LP/J mouse (1983)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1983-08-26
    Description: Inbred LP/J mice develop abnormal bony lesions that are grossly and histologically similar to the lesions of human otosclerosis. This is the first known occurrence of spontaneous otosclerosis-like lesions in an animal. As in the human disease, these lesions impair audition by immobilizing the ossicles of the middle ear. The LP/J mouse may be an animal model for this common human disease.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Chole, R A -- Henry, K R -- 1 K07 NS00396-05/NS/NINDS NIH HHS/ -- 1 R01 NS17208-2/NS/NINDS NIH HHS/ -- New York, N.Y. -- Science. 1983 Aug 26;221(4613):881-2.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/6879187" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Disease Models, Animal ; Ear, Middle/pathology ; Mice ; Mice, Inbred Strains/*physiology ; Otosclerosis/etiology/*genetics/pathology ; Stapes/pathology
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  • 100
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    Somatic cell genetics and gene families (1983)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1983-05-27
    Description: The utility of somatic cell genetic analysis for the chromosomal localization of genes in mammals is well established. With the development of recombinant DNA probes and efficient blotting techniques that allow visualization of single-copy cellular genes, somatic cell genetics has been extended from the level of phenotypes expressed by whole cells to the level of the cellular genome itself. This extension has proved invaluable for the analysis of genes not readily expressed in somatic cell hybrids and for the study of multigene families, especially pseudogenes dispersed in different chromosomes throughout the genome.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉D'Eustachio, P -- Ruddle, F H -- GM-09966/GM/NIGMS NIH HHS/ -- New York, N.Y. -- Science. 1983 May 27;220(4600):919-24.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/6573776" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Base Sequence ; *Chromosome Mapping ; Chromosomes, Human ; Cricetinae ; Cricetulus ; DNA, Recombinant/metabolism ; Genes ; Genetic Markers ; Genetics ; Humans ; Hybrid Cells/metabolism ; Mice ; Polymorphism, Genetic ; RNA, Messenger/metabolism
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