Temperature acclimation of the caudal photoreceptor response in the crayfish Orconectes rusticus (Girard)

1988 ◽  
Vol 66 (5) ◽  
pp. 1168-1171 ◽  
Author(s):  
Jim H. Belanger
Keyword(s):  
Stimulus Intensity ◽  
Low Temperatures ◽  
Temperature Acclimation ◽  
Thermal Capacity ◽  
Maximum Frequency ◽  
Orconectes Rusticus ◽  
Temperature Dependent ◽  
Caudal Photoreceptor ◽  
Effects Of Temperature ◽  
Nerve Cords

Crayfish (Orconectes rusticus (Girard)) were acclimated for 3 weeks at 5 and 25 °C. The effects of temperature and temperature acclimation on the latency, maximum frequency, and sensitivity to stimulus intensity of the caudal photoreceptor response were examined in isolated abdominal nerve cords. Each of these components was temperature dependent. The maximum frequency of the response showed thermal capacity acclimation but latency did not. Caudal photoreceptor response was insensitive to stimulus intensity at low temperatures but acclimation improved sensitivity.

scholarly journals Temperature-Dependent Parasitic Relationship between Legionella pneumophila and a Free-Living Amoeba (Acanthamoeba castellanii)

2008 ◽  
Vol 74 (14) ◽  
pp. 4585-4588 ◽  
Author(s):  
Akira Ohno ◽  
Naoyuki Kato ◽  
Ryota Sakamoto ◽  
Soichiro Kimura ◽  
Keizo Yamaguchi
Keyword(s):  
Legionella Pneumophila ◽  
Low Temperatures ◽  
Acanthamoeba Castellanii ◽  
Temperature Dependent ◽  
Free Living ◽  
Free Living Amoeba ◽  
Effects Of Temperature ◽  
Number Of Bacteria

ABSTRACT We analyzed the effects of temperature on the interaction of Legionella pneumophila with Acanthamoeba castellanii. At <20°C, overexpression of type 1 metacaspase, a stimulator of A. castellanii encystation, was associated with a reduced number of bacteria within amoeba. At low temperatures, A. castellanii seems to eliminate L. pneumophila by encystation and digestion.

scholarly journals Recovery of Anastomosis Groups of Rhizoctonia solani from Different Latitudinal Positions and Influence of Temperatures on Their Growth and Survival

Plant Disease ◽  
2004 ◽  
Vol 88 (8) ◽  
pp. 817-823 ◽  
Author(s):  
R. Harikrishnan ◽  
X. B. Yang
Keyword(s):  
Growth Rate ◽  
Rhizoctonia Solani ◽  
Low Temperatures ◽  
Anastomosis Group ◽  
Optimum Temperature ◽  
Temperature Dependent ◽  
Growth And Survival ◽  
Northern Latitudes ◽  
Effects Of Temperature ◽  
Over Time

Multinucleate Rhizoctonia solani isolates were recovered from soybean fields from five locations at a range of latitudes from 33 to 46°N. Out of 143 multinucleate isolates recovered, 51 isolates were anastomosis group (AG)-1 (35.6%), 9 were AG-2-2 (6.2%), 40 were AG-4 (28%), and 15 were AG-5 (10.6%). The remaining 28 isolates (19.6%) failed to anastomose with any of the testers (AG-1, 2-2, 4, or 5). Among the four AGs, AG-1 was found mainly in the more southern latitudes in contrast to AG-2-2, which was found mostly in the more northern latitudes. AG-4 and AG-5 were distributed across all latitudes. Effects of temperature on growth, sclerotia production (range from 5 to 30°C with 5° increments), and saprophytic survival using infested straw (range from -10 to 30°C with 10° increments) were studied with representative isolates from AG-1, AG-2-2, AG-4, and AG-5 isolated from different locations. Results indicate differential effects of temperature on growth rate and sclerotia production among the isolates within each AG. Optimum temperature for growth rate of all isolates tested from the different AGs was between 25 and 30°C; whereas, for sclerotia production, it was 25°C. Isolates from AG-1 had the highest mean sclerotia production. Saprophytic survival of isolates from all AGs tested declined linearly over time and with decrease in temperature in the survival study. Saprophytic survival of all isolates irrespective of AG collected from the southernmost location was lower at low temperatures than that of isolates collected from higher latitudes. Our results suggest temperature dependent response among isolates within different AGs of R. solani.

MAGNETIC BEHAVIOUR OF UPdAl, UCuGa AND UCuSn

1993 ◽  
Vol 07 (01n03) ◽  
pp. 850-854 ◽  
Author(s):  
V.H. TRAN ◽  
R. TROĆ
Keyword(s):  
Electrical Resistivity ◽  
Magnetic Susceptibility ◽  
Low Temperatures ◽  
Magnetic Behaviour ◽  
Type Structure ◽  
Complex Structures ◽  
Temperature Dependent ◽  
Antiferromagnetic Ordering

Magnetic susceptibility and electrical resistivity have been measured on UCuGa, UCu1+xSn1−x, (x=0 and 0.1), and UPdAl. The first two compounds, crystallizing in the hexagonal CaIn2-type structure, show at low temperatures an antiferromagnetic ordering probably with complex structures. UPdAl, which adopts the orthorhombic TiNiSi-type structure, was found to be a weakly temperature-dependent paramagnet down to 4.2 K.

scholarly journals Global dynamics of a Huanglongbing model with a periodic latent period

2021 ◽  
Vol 0 (0) ◽  
pp. 0
Author(s):  
Yan Hong ◽  
Xiuxiang Liu ◽  
Xiao Yu
Keyword(s):  
Reproduction Number ◽  
Threshold Value ◽  
Transmission Model ◽  
Threshold Dynamics ◽  
Global Dynamics ◽  
Temperature Dependent ◽  
Candidatus Liberibacter ◽  
Effects Of Temperature ◽  
Disease Free ◽  
The Basic Reproduction Number

<p style='text-indent:20px;'>Huanglongbing (HLB) is a disease of citrus that caused by phloem-restricted bacteria of the Candidatus Liberibacter group. In this paper, we present a HLB transmission model to investigate the effects of temperature-dependent latent periods and seasonality on the spread of HLB. We first establish disease free dynamics in terms of a threshold value <inline-formula><tex-math id="M1">\begin{document}$ R^p_0 $\end{document}</tex-math></inline-formula>, and then introduce the basic reproduction number <inline-formula><tex-math id="M2">\begin{document}$ \mathcal{R}_0 $\end{document}</tex-math></inline-formula> and show the threshold dynamics of HLB with respect to <inline-formula><tex-math id="M3">\begin{document}$ R^p $\end{document}</tex-math></inline-formula> and <inline-formula><tex-math id="M4">\begin{document}$ \mathcal{R}_0 $\end{document}</tex-math></inline-formula>. Numerical simulations are further provided to illustrate our analytic results.</p>

Effects of Temperature and Charge Depletion on the Spin Density in Hydrogenated Amorphous Silicon

1991 ◽  
Vol 219 ◽  
Author(s):  
J.-K. Lee ◽  
E. A. Schiff
Keyword(s):  
Spin Density ◽  
Negative Charge ◽  
Temperature Dependent ◽  
Defect Model ◽  
Depletion Width ◽  
Initial Charge ◽  
Effects Of Temperature ◽  
Hydrogenated Amorphous ◽  
Spin Densities ◽  
Charge Depletion

ABSTRACTThe dependence of the spin density upon temperature and charge depletion is calculated based on the standard defect model in a-Si:H of a D-center with positive, neutral, and negative charge states. The results are compared with recent measurements of depletion width modulated spin densities and temperature-dependent spin densities. It is shown that the initial charge density assumed for the defect system substantially affects conclusions regarding electronic correlation energies drawn from the measurements.

scholarly journals Emission Characteristics of Fluorescent Labels with Respect to Temperature Changes and Subsequent Effects on DNA Microchip Studies

2005 ◽  
Vol 71 (10) ◽  
pp. 6453-6457 ◽  
Author(s):  
Wen-Tso Liu ◽  
Jer-Horng Wu ◽  
Emily Sze-Ying Li ◽  
Ezrein Shah Selamat
Keyword(s):  
Melting Curve ◽  
Melting Curve Analysis ◽  
Emission Characteristics ◽  
Fluorescent Labels ◽  
Temperature Dependent ◽  
Temperature Changes ◽  
Formamide Concentration ◽  
Effects Of Temperature ◽  
Microarray Studies ◽  
Texas Red

ABSTRACT The effects of temperature, salt concentration, and formamide concentration on the emission characteristics of commonly used fluorescent labels were evaluated on DNA microchips. The emission intensities of different fluorophores without hybridization were observed to vary, each to a different extent, to mainly temperature changes. Rhodamine red, TAMRA (tetramethylrhodamine), and dyes from the carbocyanide group exhibited the largest variations, and Texas Red and Oregon Green exhibited the smallest variations. This temperature dependency was shown to affect results obtained during melting curve analysis in DNA microarray studies. To minimize the bias associated with the temperature-dependent emission of different fluorescent labels, a normalization step was proposed.

scholarly journals Thermoregulation of Escherichia coli hchA Transcript Stability

2007 ◽  
Vol 189 (15) ◽  
pp. 5779-5781 ◽  
Author(s):  
Aviram Rasouly ◽  
Yotam Shenhar ◽  
Eliora Z. Ron
Keyword(s):  
Escherichia Coli ◽  
High Temperature ◽  
Low Temperatures ◽  
Temperature Dependent ◽  
Present Evidence ◽  
Transcript Stability

ABSTRACT The conserved chaperone Hsp31 of Escherichia coli is transcribed at low temperatures by σS and repressed by H-NS, whereas at high temperature, transcription is by σ70 independently of both σS and H-NS. Here we present evidence for an additional, novel, temperature-dependent control of Hsp31 expression by increased transcript stability.

Sign in / Sign up

Export Citation Format

Share Document