Library

feed icon rss

Your email was sent successfully. Check your inbox.

An error occurred while sending the email. Please try again.

Proceed reservation?

Export
Filter
  • Articles: DFG German National Licenses  (8)
  • 1990-1994  (8)
Source
  • Articles: DFG German National Licenses  (8)
Material
Years
Year
  • 1
    Electronic Resource
    Electronic Resource
    Springer
    Naunyn-Schmiedeberg's archives of pharmacology 347 (1993), S. 28-33 
    ISSN: 1432-1912
    Keywords: Ultradian rhythm ; Hypothalamus ; Pushpull cannula ; Dopamine ; Noradrenaline ; Adrenaline
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary To investigate the patterns of catecholamine release in the brain, the hypothalamus of conscious, freely moving rats was superfused through a push-pull cannula with artificial cerebrospinal fluid and the catecholamines dopamine, noradrenaline and adrenaline were determined in the superfusate radioenzymatically. Superfusate was continuously collected in time periods of 20 min for at least 20h. Dopamine, noradrenaline and adrenaline release rates fluctuated according to an ultradian rhythm with a frequency of 1 cycle/92 min (dopamine and noradrenaline) or 99 min (adrenaline). Additionally, the three catecholamines were released according to an ultradian rhythm with the following frequencies: noradrenaline and adrenaline 1 cycle/ 12 h, dopamine 1 cycle/8 h. The release rates of dopamine and adrenaline were similar during light and dark periods, while the release rate of noradrenaline in the dark period was slightly lower than that during the light period. It is concluded that in the hypothalamus of the conscious rat the release rates of dopamine, noradrenaline and adrenaline fluctuate according to two ultradian rhythms with different frequencies.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
  • 2
    ISSN: 1434-6052
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The production of the neutralK − (892) resonances by 200 GeVK − andπ − has been studied over the kinematic range 0.0〈x f〈1.0 andp t 2 〈5.0 GeV2. Longitudinal and transverse momentum distributions are presented. In addition the decay angular distributions inK − fragmentation to $$\bar K^{0*} $$ have been investigated.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
  • 3
    ISSN: 1434-6052
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract We present the final results on the measurement of the masses and lifetimes of the mesonsD 0,D + andD s + in the NA32 experiment at the CERN SPS, using silicon microstrip detectors and charge-coupled devices for vertex reconstruction. We measure the following lifetimes: $$\tau _{D^0 } = 3.88 \pm _{0.21}^{0.23} \cdot 10^{ - 13} s$$ using a sample of 479D°→K −π+π−π+ and 162D°→K −π+ decays; $$\tau _{D^ + } = 10.5 \pm _{0.72}^{0.77} \cdot 10^{ - 13} s$$ with a sample of 317D +→K −π+π+ decays; $$\tau _{D_s^ + } = 4.69 \pm _{0.86}^{1.02} \cdot 10^{ - 13} s$$ with a sample of 54D s + →K + K −π+ decays. We measure the following masses:m D 0=1864.6±0.3±1.0 MeV,m D +=1870.0±0.5±1.0 MeV and $$m_{D_s^ + } $$ =1967.0±1.0±1.0 MeV.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
  • 4
    ISSN: 1434-6052
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract In the CERN NA 32 experiment a high-resolution silicon vertex detector and a purely topological approach have been used to investigate various decays of charmed particles. We observe ∼620 fully reconstructed decays ofD 0 in 12 channels and determine the branching ratios. For fourD 0 decay modes involving a single (unseen) π0 the small and narrowD *+−D 0 mass difference is used to measure their branching ratios. We also observe ∼280 fully reconstructedD + decays in 10 channels, ∼90D s + decays in 11 channels as well as 160Λ s c and 18 decay channels ofD +. For theD s + , we measure the branching fractions within a subset of 16 three- and five-prong decay channels. For theΛ s c , we determine the branching fractions within a sample of 11 three- and five-prong decay channels, nearly all involving a proton.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
  • 5
    ISSN: 1434-6052
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract We combine highly complementary information on branching fractions of charmed mesonsD 0,D + andD s + coming from two experiments both yielding doublecharm samples. The NA 32 experiment provided exclusive branching fractions for channels with at least two charged decay products while a recent Mark III paper provides results on inclusive charm decay properties. The knowledge of channels withK 0's in the former is used to recalculate the charged multiplicity distribution in the latter. We obtain 〈n ch〉=2.25±0.08 forD 0, 〈n ch〉=1.96±0.08 forD + and 〈n ch〉=2.41±0.38 forD s + . In turn the knowledge of the charged multiplicity improves the overall normalization of exclusive branching fractions. This reanalysis yields model-independent results for charmed mesons. In particular we obtain branching fractions for 16D s + decay channels including $$BF(D_s^ + \to \phi \pi ^ + ) = \left( {4.4\begin{array}{*{20}c} { + 2.3} \\ { - 1.8} \\ \end{array} } \right)\% .$$ .
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
  • 6
    ISSN: 1434-6052
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Data on the production of the neutralK *(892) resonances at lowp t by 200 GeVK − and π− is compared with the predictions of various models based on the quark parton model of hadrons.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
  • 7
    ISSN: 1434-6052
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract We have studied the hadronic production of charmed mesons in the NA 32 experiment at CERN. A special trigger together with a high resolution vertex detector consisting of charge coupled devices and silicon microstrip detectors allowed the selection of very clean samples of charmed mesons. We have collected 852 fully reconstructed decays: 60D s + →K + K −π+, 543D°→K −π+ andK −π+π−π+ as well as 249D +→K −π+π+ (or charge conjugate). 147 mesons out of our $${{D^0 } \mathord{\left/ {\vphantom {{D^0 } {\bar D^0 }}} \right. \kern-\nulldelimiterspace} {\bar D^0 }}$$ sample were produced via chargedD * state. For all charmed mesons we determine the total production cross-section and study thex F andp t 2 distributions.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
  • 8
    ISSN: 1439-0574
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Description / Table of Contents: Summary A new method and new equipment to discover game hidden in meadows is presented. Its application as a detection instrument in searching for fawns, young hares, as well as the nests of pheasants and partridges is proposed. For example, this instrument could be used to rescue game before mowing or to mark fawns. The animals are detected by temperature differences to the surrounding meadow. Infrared sensors scan across the meadow, detect radiating heat and set off an alarm when the average radiation is greater than the norm for the meadow, i.e. a fawn or other animal. After an encouraging start with a laboratory model, an improved experimental model for field testing was successfully tried out in May, 1992 on fawns. Trials using pheasant chicks, a chicken, and a laboratory rat, all in a flight cage, supplemented the investigation. This battery powered instrument can be carried by one person, covers a span of 6 m, and possesses a display and monitor controlling the direction of scanning. The application mounted on a mowing tractor is at present not possible. However, investigations into this possiblity are in preparation.
    Abstract: Résumé Un nouveau procédé et un nouvel appareil sont présentés en vue de déceler la présence de gibier dans des herbages. L'utilisation de cet appareil comme détecteur de faons de Chevreuil (pendant la phase au cours de laquelle ils se tapissent), de levrauts ainsi que de couvées de Faisan et de Perdrix est prévue. Ainsi peut-on s'en servir pour sauver du gibier lors de la moisson et pour le marquer. Le principe de la détection repose sur une différence de température entre l'animal et le milieu environnant. La prairie est balayée au moyen de senseurs à infra-rouge; la détection d'un rayonnement plus chaud (par exemple un faon de Chevreuil) que le rayonnement du milieu environnant provoque le déclenchement d'une alarme. Après quelques résultats encourageants avec un prototype, un appareil amélioré fut testé avec succès en mai 1992 sur des faons de Chevreuil dans des conditions de terrain. Des essais complémentaires furent effectués en volière sur des faisandeaux, sur une poule domestique et sur un rat de laboratoire. L'appareil alimenté par une batterie peut être porté par une personne, couvre des bandes de 6 m de large et dispose d'un régulateur de sensibilité. L'utilisation de cet appareil à partir d'un tracteur n'est pas encore possible. Des recherches approfondies sur cette application sont en préparation.
    Notes: Zusammenfassung Ein neues Verfahren und Gerät zur Entdeckung von Wild in Wiesen wird vorgestellt. Seine Verwendung als Suchgerät von Kitzen in der Drückphase, von Junghasen, sowie von Gelegen von Fasan und Rebhuhn ist vorgesehen. Beispielsweise ist der Einsatz zur Wildrettung vor der Mahd und zur Kitzmarkierung möglich. Zur Detektion des Tieres wird sein Temperaturunterschied gegenüber der Wiese genutzt. Infrarotsensoren werden über die Wiese bewegt, detektieren die ausgesandte Wärmestrahlung und lösen einen Alarm aus, wenn diese den mittleren Strahlungspegel der Wiese überschreitet, also ein wärmeres Objekt, z. B. ein Kitz, vorhanden ist. Nach ermutigenden Anfangserfolgen mit einem Labormuster des Geräts wurde im Mai 1992 ein verbessertes Experimentalmuster im Feldeinsatz mit guten Ergebnissen an Rehkitzen erprobt. Versuche an Fasanenküken, einem Haushuhn und einer Laborratte in einer Voliere ergänzten die Untersuchungen. Das batteriebetriebene Gerät kann von einer Person getragen werden, überstreicht einen 6 m breiten Streifen und verfügt über eine anzeigenunterstützte Kontroll- und Einstelleinrichtung der Empfindlichkeit. Ein Betrieb am mähenden Traktor ist zur Zeit noch nicht möglich, grundlegende Untersuchungen dazu sind in Vorbereitung.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
Close ⊗
This website uses cookies and the analysis tool Matomo. More information can be found here...