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  • 1980-1984  (8)
  • 1
    Electronic Resource
    Electronic Resource
    Springer
    Cellular and molecular life sciences 40 (1984), S. 202-203 
    ISSN: 1420-9071
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary The cells in S-phase at the time of a short treatment with cycloheximide, inducing reversible arrest of the cell cycle, enter mitosis before those in G2 and are divided into 2 subpopulations when cell proliferation resumes.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Springer
    Il nuovo cimento della Società Italiana di Fisica 1 (1982), S. 549-559 
    ISSN: 0392-6737
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Description / Table of Contents: Riassunto Si presenta uno studio mediante fotoemissione con luce di sincrotrone degli stati nella banda di valenza superiore di quattro composti con struttura del tipo ZrSe3: ZrS3, ZrSe3, ZrTe3 e HfSe3. Gli spettri dei seleniuri e del solfuro presentano una struttura caratteristica a cinque picchi in accordo con le densità degli stati di ZrSe3 calcolate da Myronet al. e de Bullett. La natura di questi picchi è causata dall’azione combinata della reibridizzazione di orbitali di anioni accoppiati e dell’ibridizzazione di stati di anioni non accoppiati con, stati cationici. Lo spettro di ZrTe3 presenta solo tre picchi che appaiono collegati a tre dei picchi spettrali, osservati per i seleniuri e per il solfuro. Le differenze fra gli spettri del telloruro e quelli dei seleniuri e del solfuro sono discusse in relazione alla grande distanza fra anioni accoppiati e cationi primi vicini nel telloruro.
    Abstract: Резюме мы предлагаем результаты исследований фотоэмиссии синхротронного излучения для верхних состояний валентной зоны для четырех соединений со структурой типа ZrSe3: ZrS3, ZrSe3, ZrTe3 и HfSe3. Спекты сельфида и селенида обнаруживают структуру с пятью пиками, что согласуется с вычисленной Мироном и др. и Булле плотностью состояний для ZrSe3. Природа этих особенностей связана с взаимодействием между перегибридизацией орбиталей спаренных анионов и гибридизацией орбиталей не спаренных анионов с катионными состояниями. Спектр ZrTe3 обнаруживает только три пика, которые, по-видимому, связаны с тремя наблюденными спектральными особенностями сульфида и селенида. Различия между спектрами сульфида и селенида и спектрами теллурида сбсуждаются в терминан очень большого расстояния между спаренными анионами и соседними катионами в теллуриде.
    Notes: Summary We present a synchrotron radiation photoemission study of the upper-valence-band states of four ZrSe3-structure compounds: ZrS3, ZrSe3, ZrTe3 and HfSe3. The sulphide and selenide spectra exhibit a characteristic five-peak structure in agreement with the calculated ZrSe3 density of states by Myronet al. and by Bullett. The nature of these features is established by an interplay between the rehybridization of paired-anion ligand orbitals and the hybridization of unpaired-anion states with cation states. The spectrum of ZrTe3 exhibits only three peaks that appear related to three of the sulphide and selenide spectral features. The differences between the sulphide, selenide spectra and the telluride spectra are discussed in terms of the very large distance between pairedanion ligands and neighbour cations in the latter compound.
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Springer
    Il nuovo cimento della Società Italiana di Fisica 4 (1984), S. 141-152 
    ISSN: 0392-6737
    Keywords: Optical properties and materials
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Description / Table of Contents: Riassunto Sono state studiate, mediante la tecnica della termoriflettanza, le principali strutture dello spettro interbanda dei cristalli Ti1−x Hf x Se2 (0≤x≤0.3 ex=1), fra 1 e 9 eV. Si sono così ottenute nuove indicazioni circa la corrispondenza fra gli spettri interbanda del TiSe2 e dell'HfSe2. Si riportano in dettaglio e discutono i dati di termoriflettanza a valori intermedi dix con evidenza di possibili effetti di «bowing». Non sono stati osservati apprezzabili effetti della transizione di fase a 200 K ad energie superiori a 2 eV.
    Abstract: Резюме Исследуются главные особенности междузонных спектров кристаллов Ti1−xHf x Se2 (0≤x≤0.3 иx=1) с помощью техники термоотражения в области от 1 до 9 эВ. Приводятся новые данные о соответствии между междузонными спектрами TiSe2 и HfSe2. Подробно обсуждаются данные при промежуточных значенияхx. Не наблюдаются заметные эффекты фазового перехода при 200 К в TiSe2 при энергиях выше 2 эВ.
    Notes: Summary The main structures of interband spectra of Ti1−x Hf x Se2 crystals (0≤x≤0.3 andx=1) have been investigated by means of thermoreflectance from 1 to 9 eV. New indications about the correspondence of the interband spectra of TiSe2 and HfSe2 are given. Detailed data at intermediate stoichiometries, which give also evidence of possible bowing effects, are reported and discussed. No relevant effect of the 200 K phase transition in TiSe2 is observable above 2 eV.
    Type of Medium: Electronic Resource
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  • 4
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    Unknown
    San Marino, Calif. : Periodicals Archive Online (PAO)
    Huntington Library quarterly. 47:3 (1984:Summer) 233 
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  • 5
    Electronic Resource
    Electronic Resource
    Springer
    Cellular and molecular life sciences 36 (1980), S. 939-940 
    ISSN: 1420-9071
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary Binucleate cells are produced in garlic root tip cells with puromycin and with 6-dimethylaminopurine (6-DMAP), the purine component of puromycin. The possibility that the effect of puromycin on cytokinesis is due to 6-DMAP-which appears to be without short term effects on protein synthesis-is discussed.
    Type of Medium: Electronic Resource
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  • 6
    ISSN: 1434-6052
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract A partial wave analysis of theK $$\bar K$$ system produced by 8.25 GeV/cK − mesons in the reaction $$K^ - p \to K\bar K\Lambda ^{ 0} $$ has been performed, taking into account the information provided by the Λ0 decay. Thef′ region is dominated byD 0 (−) andD 1 (+) waves. We see no evidence for the production of new 0++ states in the mass region 1.05 to 1.75 GeV.
    Type of Medium: Electronic Resource
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  • 7
    ISSN: 1434-6052
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The production ofK * resonances has been studied in the reaction $$K^ - p \to \bar K^0 \pi ^ - p$$ at 8.25 GeV/c. The data comes from a high statistics bubble chamber experiment (180 events/μb). Masses, widths and production cross-sections have been determined for the first threeK *'s. The contributions from natural and unnatural parity exchange have been obtained for theK *(890) and theK *(1420). A partial wave analysis of theK π system from threshold to 1.9 GeV provides evidence for a 0+ enhancement near 1.4 GeV which could be interpreted as the κ(1350).
    Type of Medium: Electronic Resource
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  • 8
    ISSN: 1434-6052
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The reactionsK − p→π ∓ Σ(1385)± are studied at an incident laboratory momentum of 8.25 GeV/c using data from a high statistics (≃180 events/μb) bubble chamber experiment. In the case of the reactionK − p→π − Σ(1385)+ an amplitude analysis is performed and the complete Σ(1385)+ spin density matrix is extracted as a function oft′. The results are compared with the predictions of the additive quark model. In the case of the reactionK − p→π + Σ(1385)− the cross-sections for forward and backward production are determined.
    Type of Medium: Electronic Resource
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