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1Author    Erich HitzelRequires cookie*
 Title    Abbau von Induktionsperioden und Steigerung der Aktivität homogener Hydrierungskatalysatoren mit Iridium als Zentralatom Reduction of Induction Periods and Increase of Activity of Homogenous Iridium Hydrogenation Catalysts  
 Abstract    With complexes of iridium as catalysts, induction periods are typical for homogeneous hydrogenation of olefins in bulk. The induction period decreases, as a rule with increasing activity, at higher temperatures and may be suppressed with dibenzoylperoxide, azo-bisisobutyrodinitrile, tetrachloro-l,4-benzoquinone or by preactivation. Triethylamin and SnCl2 • 2H2O are unsuitable additives. The operation "preactivation" leads additionally to great substrate/catalyst-turnover numbers. 
  Reference    Z. Naturforsch. 33b, 997—1000 (1978); eingegangen am 19. Juni 1978 
  Published    1978 
  Keywords    Catalysis, Hydrogenation, Induction Periods, Activity 
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 TEI-XML for    default:Reihe_B/33/ZNB-1978-33b-0997.pdf 
 Identifier    ZNB-1978-33b-0997 
 Volume    33 
2Author    JuanB. Rodriguez, EduardoG. Gros, AngelM. StokaRequires cookie*
 Title    Synthesis and Activity of Juvenile Hormone Analogues (JHA)  
 Abstract    From geranylacetone and by the use of a variety of reagents, twelve analogues of the juvenile hormone III were synthesized. The compounds (5—16) have an isoprenic structure bearing at the extreme of the chain functional groups as carbonate, carbamate, thiolcarbonate, thiolcarbamate, carbonyloxyimino and thiol carbonyloxyimino. Compounds 5—9 present the normal unsaturated isoprenic chain while compounds 10—16 have a monoepoxide function. All the compounds were tested for their respective juvenile hormone activity for Triatoma infestans and Rhodniusprolixus. The most active compounds were those having a thiol carbonate group independently of the oxidation state of the molecule. The synthetic procedures and the biological results are discussed. 
  Reference    Z. Naturforsch. 43b, 1038—1042 (1988); received March 8. 1988 
  Published    1988 
  Keywords    Juvenile Hormone Analogues, Activity, Synthesis 
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 TEI-XML for    default:Reihe_B/43/ZNB-1988-43b-1038.pdf 
 Identifier    ZNB-1988-43b-1038 
 Volume    43 
3Author    Karlfriedrich Hofmann, Martina Günderoth-Palmowski, Gottfried Wiedenmann, Wolfgang EngelmannRequires cookie*
 Title    Further Evidence for Period Lengthening Effect of L i+ on Circadian Rhythms  
 Abstract    The period length of the activity rhythm of the cockroach Leucophaea maderae is increased by a LiCl solution of 100 mol m—3 offered as drinking water by about 1%. 
  Reference    Z. Naturforsch. 33c, 231 (1978); received February 2. 1978 
  Published    1978 
  Keywords    Circadian Rhythm, Activity, Li, Leucophaea maderae, Mesocricetus auratus 
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 TEI-XML for    default:Reihe_C/33/ZNC-1978-33c-0231.pdf 
 Identifier    ZNC-1978-33c-0231 
 Volume    33 
4Author    GottfriedW. IedenmannRequires cookie*
 Title    Weak and Strong Phase Shifting in the Activity Rhythm of L eu co p h a ea m a d e r a e (Blaberidae) after Light Pulses of High Intensity  
 Abstract    In the running activity of the cockroach Leucophaea maderae a strong phase response curve is found when using high intensity light pulses (80 000 lx and about 12 hours duration). The phase response curve has an unsymmetric shape: delays are larger than advances. The phase jump lies about 2 hours after subjective midnight. 
  Reference    (Z. Naturforsch. 32c, 464 [1977]; received February 21 1977) 
  Published    1977 
  Keywords    Activity, Circadian Rhythm, Cockroach, Leucophaea, Light Pulse, Phase Response Curve 
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 TEI-XML for    default:Reihe_C/32/ZNC-1977-32c-0464_n.pdf 
 Identifier    ZNC-1977-32c-0464_n 
 Volume    32 
5Author    A. Johnsson, W. Engelmann, W. Klemke, AudTveito EkseRequires cookie*
 Title    Free-Running Human Circadian Rhythms in Svalbard  
 Abstract    The body temperature, activity-rest time, electrolytes of urine samples and mood was measured in two persons during a 19 day period under continuous light conditions in the arctic (vicinity of Ny Alesund, Svalbard-Spitsbergen). For temperature recording a new thermoprobe and a portable printer was used. Possible week Zeitgeber of the 24 hour day did not synchronize the circadian system, since circadian rhythms of about 26 hours were found. These results open up the pos­ sibility to study effects of drugs on the circadian system of humans under Svalbard conditions. In tro d u c tio n 
  Reference    Z. Naturforsch. 34c, 470 (1979); received March 13 1979 
  Published    1979 
  Keywords    Circadian Rhythms, Body Temperature, Activity, Urine Electrolytes, Humans, Svalbard-Spitsbergen 
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 TEI-XML for    default:Reihe_C/34/ZNC-1979-34c-0470.pdf 
 Identifier    ZNC-1979-34c-0470 
 Volume    34 
6Author    Takashi Fujim, Isao KaetsuRequires cookie*
 Title    Nature of Yeast Cells Immobilized by Radiation Polymerization Activity Dependence on the Molecular Motion of Polymer Carriers  
 Abstract    Higher activity of ethanol production due to higher density of yeast cells, was observed in yeast cells immobilized with artificial polymer carriers of higher molecular motion. These polymer carriers were prepared by radiation-induced polymerization below 0 °C. Yeast cells were im­ mobilized with these carriers by adsorption method during multiplication. Molecular motion of polymer carriers in swollen state was evaluated by the line width of nuclear magnetic resonance spectrum. A possible reason for higher activity was discussed. This study of relation between molecular motion of polymer carriers and activity of yeast cells immobilized with these carriers, is very useful to design the chemical and physical structure of polymer carriers for immobilization of microorganisms. 
  Reference    Z. Naturforsch. 40c, 576 (1985); received December 31 1984/April 30 1985 
  Published    1985 
  Keywords    Yeast Cells, Activity, Molecular Motion, Immobilization by Radiation Polymerization, Polymer Carriers 
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 TEI-XML for    default:Reihe_C/40/ZNC-1985-40c-0576.pdf 
 Identifier    ZNC-1985-40c-0576 
 Volume    40 
7Author    Anders Johnsson, Wolfgang Engelmann, Burkhard Pflug, W. Aldem, Ar KlemkeRequires cookie*
 Title    Influence of Lithium Ions on Human Circadian Rhythms  
 Abstract    Lithium carbonate lengthens the circadian period in humans under temporal isolation (arctic summer four groups. L i+ ions are known to change the period length of several circadian rhythm s in plants and animals [1], In all cases reported so far the effect is a lengthening o f the free running period. An experiment has been performed on a single person in an isolation unit to test whether L i+ acts on hum an circadian rhythms and the results provided have not been conclusive [2]. We have conducted an experiment to determine the influence o f L i+ on the hum an circadian system under arctic sum m er conditions. The continuous light and abscence o f other 24 h tim e cues allows free run o f hum an circadian rhythms [3]. In this brief report, we present some salient results of the effects of Li+ on the tem perature-, sleep-wakefulness-, and activity rhythm in some humans. More details of this investigation will be published elsewhere. 
  Reference    Z. Naturforsch. 35c, 503—507 (1980); received January 14 1980 
  Published    1980 
  Keywords    Dedicated to Prof C H Hertz, Lund University, Sweden, on His 60th Birthday Circadian Rhythms, Lithium, Body Temperature, Activity, Svalbard-Spitsbergen 
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 TEI-XML for    default:Reihe_C/35/ZNC-1980-35c-0503.pdf 
 Identifier    ZNC-1980-35c-0503 
 Volume    35