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1Author    Oldřich Matal, Josef Žaloudek, Frantisek Cigánek, Pavel Slavíček3, BronislavŽ. Mija, Milan NejedlýRequires cookie*
 Title    Density Measurement of Molten KHF2  
 Abstract    An apparatus has been manufactured to measure the density of molten KHF2. A linear dependence of the density on temperature is found in the range of 280-450 °C. 
  Reference    Z. Naturforsch. 56a, 707—709 (2001) 
  Published    2001 
  Keywords    Molten KHF2, Density, Temperature 
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 TEI-XML for    default:Reihe_A/56/ZNA-2001-56a-0707.pdf 
 Identifier    ZNA-2001-56a-0707 
 Volume    56 
2Author    Arthur HollRequires cookie*
 Title    der grünen Huschspinne Micromata rosea (Sparassidae) Temperature-Dependent Colour Change in Larvae of the Green Spider Micromata rosea (Sparassidae)  
 Abstract    In the green coloured larvae of Micromata rosea but not in adults temperature raise above 29 °C causes immediate colour change: green to bluish-green. Colour change is reversible by temperature decline below 29 °C. Qualitative analysis of the yolk pigment reveals the same biliverdin conjugates (micromatabilin) as previously identified for adult spiders. The bluish-green colour (above 29 °C) re­ sults from an absorption band (675-680 nm, water phase, purified solution) modified to that of the green solution (below 29 °C). Presumably, the thermodependent, rever­ sible colour change is due to a special yolk protein bond to the micromatabilin chromophor. 
  Reference    Z. Naturforsch. 37c, 1040—1041 (1982); eingegangen am 25. März/30 Juni 1982 
  Published    1982 
  Keywords    Colour Change, Temperature, Spider, Micromatabilin 
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 TEI-XML for    default:Reihe_C/37/ZNC-1982-37c-1040_n.pdf 
 Identifier    ZNC-1982-37c-1040_n 
 Volume    37 
3Author    Rainer KimmichRequires cookie*
 Title    Multidimensional NQR: Imaging and Exchange Spectroscopy  
 Abstract    In this context a "dimension" can be of a spatial or of a spectroscopic nature. In the last two decades, multidimensional nuclear magnetic resonance and imaging have proven to be most useful tools for the investigation of materials. It turned out that some of these measuring principles can be applied to zero-field NQR as well. The purpose of this presentation is to elucidate two-dimensional exchange spectroscopy and imaging procedures suitable for NQR and to outline potential applications. 
  Reference    Z. Naturforsch. 51a, 330—336 (1996); received January 22 1996 
  Published    1996 
  Keywords    NQR, imaging, 2D exchange spectroscopy, pressure, temperature 
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 TEI-XML for    default:Reihe_A/51/ZNA-1996-51a-0330.pdf 
 Identifier    ZNA-1996-51a-0330 
 Volume    51 
4Author    Ursula Hamm, M. Aroli, K. Chandrashekaran, W. Olfgang EngelmannRequires cookie*
 Title    Temperature Sensitive Events between Photoreceptor and Circadian Clock?  
 Abstract    The phase shifting action of low temperature pulses of 6 °C and 2 h duration administered to the various phases of the D rosoph ila pseudoobscu ra circadian rhythm and the action of light pulses given 30 min after the beginning of these low temperature pulses have been investigated. The phase response curve obtained from experiments with light pulses during low temperature cannot be ex­ plained on the basis of a straightforward and sequential phase shifting of the oscillation by the various transitions in the pulses. The response curve, after the slight phase shifting action of the temperature pulses is corrected for, resembles the standard phase response curve 4 for light pulses (at 20 °C) in its wave form but n ot in its time course. Our curve is shifted in time in a manner that indicates that the light pulses accompanying the low temperature pulses arrived at phase points 1.5 h later than the actual phases at which they were given. We attribute this delay to a slowing down of the information that is apparently transmitted by a process that is temperature dependent. 
  Reference    (Z. Naturforsch. 30c, 240 [1975]; received November 22 1974) 
  Published    1975 
  Keywords    Circadian Rhythm, Photoreceptor, Temperature, D rosophila pseudoobscura 
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 TEI-XML for    default:Reihe_C/30/ZNC-1975-30c-0240.pdf 
 Identifier    ZNC-1975-30c-0240 
 Volume    30 
5Author    Wolfram Lork, Til Kreuels, Wolfgang Martin, Klaus BrinkmannRequires cookie*
 Title    System Analysis of the Circadian Rhythm of Euglena gracilis, I. Linearities and Non-Linearities in the Response to Temperature Signals  
 Abstract    The approach of control theory is used to describe the structure of the circadian system of Euglena gracilis. As a first step we discriminate linear and non linear properties of the dynamics. The cellular motility as measured via long time records of sedimentation parameters in cultures is defined as the system output; sinusoidal temperature signals are used as input. By means of non stationary signal processing procedures we estimate gain and phase of the output signal. The problem of defining an appropiate gain of a cell suspension with an undefinite number of cells is solved by using the superimposition of two different input signals and by keeping one of them fixed as a reference signal. Linear properties are shown with a linear frequency transfer and with the validity of the superposition principle at least within distinct regions of amplitude and frequency. Non linear properties are the signal distortion, the restriction of linear amplification to a distinct range of input temperature and the ambiguity of phase coupling near the circadian eigenfrequency. The apparent lack of a limit of entrainment -an unexpected linear property — is explained by the masking effect of thermokinesis. A model is proposed describing the simultaneous control of motility by thermokinesis and the circadian system. On the base of that model further experiments are outlined. 
  Reference    Z. Naturforsch. 37c, 1240—1252 (1982); received June 15 1982 
  Published    1982 
  Keywords    Circadian Rhythm, Euglena, Motility, Oscillator, Temperature 
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 TEI-XML for    default:Reihe_C/37/ZNC-1982-37c-1240.pdf 
 Identifier    ZNC-1982-37c-1240 
 Volume    37 
6Author    C. J. Soeder, E. Hegewald, E. Fiolitakis, J.U G RobbelaarRequires cookie*
 Title    Temperature Dependence of Population Growth in a Green Microalga: Thermodynamic Characteristics of Growth Intensity and the Influence of Cell Concentration  
 Abstract    Growth intensity o f the green alga, Scenedesmus obliquus, was measured in autotrophic cultures, diluted once daily, between 20 and 30 °C in a light-dark cycle o f 16 : 8 h at initial optical densities between 0.02 and 1.2. Arrhenius analyses o f the results showed linear relationships be­ tween growth intensity and temperature below the temperature optimum. The temperature effects on growth, activation energy, deactivation energy and normalized Q i0 values were signifi­ cantly influenced by the amount o f available light energy per unit biomass. The temperature dependence o f nutrient-lim ited growth was not considered. 
  Reference    Z. Naturforsch. 40c, 227—233 (1985); received Decem ber 5 1984 
  Published    1985 
  Keywords    M icroalgae, Growth, Temperature, Light, Thermodynamics 
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 TEI-XML for    default:Reihe_C/40/ZNC-1985-40c-0227.pdf 
 Identifier    ZNC-1985-40c-0227 
 Volume    40 
7Author    JukkaP. JuutilainenRequires cookie*
 Title    Effects of Low Frequency Magnetic Fields on Chick Embryos. Dependence on Incubation Temperature and Storage of the Eggs  
 Abstract    Chick embryos were exposed to sinusoidally oscillating 100 Hz magnetic fields during their first two days of development. The magnetic field strength was 1 A/m. Incubation temperatures of 36.3, 37.0, 38.0 and 38.5 °C were used and the duration of the storage of the eggs before incuba­ tion was varied from 1 hour to 4 days. After the incubation, the embryos were examined for abnormalities. When the temperature was 36.3 or 37.0 °C and the eggs were stored for one day or less, the effect of the magnetic field was statistically significant. In these conditions, the percent­ age of abnormal control embryos was low, 8% in 36.3 °C and 5% in 37.0 °C. In the exposed groups the corresponding percentages were 23% (36.3 °C) and 25% (37.0 °C). However, higher temperature and storage of the eggs for 3 to 4 days increased the percentage of abnormal embryos in both the exposed and control groups. The difference between the exposed and control embryos was not significant in these conditions. The results demonstrate the importance of the handling of the eggs in this kind of experiments. 
  Reference    Z. Naturforsch. 41c, 1111 (1986); received May 16 1986 
  Published    1986 
  Keywords    ELF Magnetic Fields, Chick Embryo, Teratology, Temperature 
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 TEI-XML for    default:Reihe_C/41/ZNC-1986-41c-1111.pdf 
 Identifier    ZNC-1986-41c-1111 
 Volume    41 
8Author    M. O. Iio, A. M. Okonkwo3, M. BamidelebRequires cookie*
 Title    Factors Affecting Growth of Sulfate-Reduc- ing Bacteria Isolated from Tropical Soil  
 Abstract    Sulfate-reducing bacteria (S R B) were isolated from soils around corroded pipelines and tanks. High num­ bers of the organisms occurred in areas closest to the corroded tanks and pipelines. Morphological types cor­ responding to rod, spirilloid, vibriod and coccoid were encountered. All the organisms utilized lactate as carbon and energy source. None could grow at temperatures higher than 40 °C. All the isolates grew at 1% (w/v) NaCl while none could grow at 8% (w/v) NaCl. All the isolates grew at pH 7 .0 -7 .5 . Growth was not recorded at pH below 5.5 and above 8.0. These factors may be useful in manipulating tropical soil environments to re­ duce activities of SR B in corrosion of pipelines and tanks. 
  Reference    Z. Naturforsch. 54c, 613 (1999); received July 1/December 10 1998 
  Published    1999 
  Keywords    Sulfate-Reducing Bacteria, Lactate, pH, Temperature, Sodium Chloride 
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 TEI-XML for    default:Reihe_C/54/ZNC-1999-54c-0613_n.pdf 
 Identifier    ZNC-1999-54c-0613_n 
 Volume    54 
9Author    Jürgen Van Der Bosch, Ilse Sommer, Heinz Maier, Willy RahmigRequires cookie*
 Title    Density-Dependent Growth Adaptation Kinetics in 3T 3 Cell Populations Following Sudden [Ca2+] and Temperature Changes. A Comparison with SV40-3T3 Cells  
 Abstract    Lowered extracellular [Ca2+ ] causes low growth rates and low stationary cell densities in 3T3 cell cultures as compared to physiological [Ca2+ ]. Under otherwise constant conditions the extra­ cellular [Ca2+ ] determines a stable stationary cell density, which can be readied by increase of net cell number or decrease of net cell number, depending on cell density at the time of [Ca2+ ] adjustment. SV40-3T3 cells do not show this [Ca2+] dependency. At 39 °C 3T3 and SV40-3T3 cell populations show an increased growth rate at low cell densities as compared to cell popula­ tions at 35 °C. Approaching the stationary density the growth rate of both cell sorts is reduced faster at 39 °C than at 35 °C, leading to lower stationary cell densities at 39 °C than at 35 °C. A temperature change from 39 °C to 35 °C or in the opposite direction can affect the stationary cell density of 3T3 cell populations only if applied before reduction of growth rate by density-dependent growth-inhibiting principles has taken place. 
  Reference    Z. Naturforsch. 34c, 279 (1979); received December 19 1978 
  Published    1979 
  Keywords    Ca2+, Temperature, Growth Control, 3T3 Cell, SV40-3T3 Cell 
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 TEI-XML for    default:Reihe_C/34/ZNC-1979-34c-0279.pdf 
 Identifier    ZNC-1979-34c-0279 
 Volume    34