INFLUENCE OF TEMPERATURE ON THE DEVELOPMENT OF A VIRUS DISEASE OF NEODIPRION SWAINEI (HYMENOPTERA: TENTHREDINIDAE)

1967 ◽  
Vol 99 (3) ◽  
pp. 244-249 ◽  
Author(s):  
W. A. Smirnoff
Keyword(s):  
Larval Development ◽  
Incubation Period ◽  
Virus Disease ◽  
Optimum Temperature ◽  
Influence Of Temperature ◽  
Temperature Range ◽  
Influence Of Temperature On ◽  
Fluctuating Temperatures

AbstractThe effect of temperatures on the development of a virus disease of Neodiprion swainei Midd. was studied at constant temperatures of 30° and 12 °C., and under fluctuating temperatures (15°–20 °C.) in the laboratory and outdoors. Viral concentrations of 30 × 106 polyhedra per ml. and 1 × 106 polyhedra per ml. were used. Only the higher concentration of virus was effective at 30 °C. At 12 °C. the incubation period of the disease was prolonged and mortality caused by the virus was considerably reduced for both viral concentrations. Mortality due to the virus was similar at both viral concentrations for the fluctuating temperatures which were within the optimum temperature range for larval development.

PRELIMINARY STUDIES OF THE PHYSIOLOGY OF SCLEROTINIA BOREALIS, A HIGHLY PSYCHROPHILIC FUNGUS

1966 ◽  
Vol 44 (3) ◽  
pp. 237-246 ◽  
Author(s):  
E. W. B. Ward
Keyword(s):  
Oxygen Uptake ◽  
Incubation Period ◽  
Similar Degree ◽  
Optimum Temperature ◽  
Influence Of Temperature ◽  
Influence Of Temperature On ◽  
Agar Media ◽  
Lag Period ◽  
Psychrophilic Fungus

A study was made of the influence of temperature on growth and oxygen uptake by Sclerotinia borealis Bub. and Vleug. Growth was measured as the increase in diameter of colonies on agar media and oxygen uptake, by conventional manometric procedures with cells removed from shake cultures incubated at 0 °C.The results indicated that the fungus is highly psychrophilic with an optimum temperature for growth at 0 °C, a maximum at approximately 15 °C, and a minimum below −5 °C. Cultures grown at 0 °C ceased to grow when transferred to temperatures above 15 °C but, within limits, resumed growth again after a lag when returned to 0 °C. The length of the lag period was proportional to both the degree and the duration of the temperature elevation.The optimum temperature for oxygen uptake was 25 °C, the rate remaining linear at this temperature during a 6-hour incubation period. The rate at 25 °C declined slowly over a period of 4 days but the rate at 1 °C declined to a similar degree. The Q10for oxygen uptake was very low, the rate at 25 °C being only double that at 1 °C.

scholarly journals Influence of temperature on the larval development of the edible crab, Cancer pagurus

2009 ◽  
Vol 89 (4) ◽  
pp. 753-759 ◽  
Author(s):  
Monika Weiss ◽  
Sven Thatje ◽  
Olaf Heilmayer ◽  
Klaus Anger ◽  
Thomas Brey ◽  
...  
Keyword(s):  
Larval Development ◽  
Body Mass ◽  
Large Scale ◽  
Citrate Synthase ◽  
C:N Ratio ◽  
Intraspecific Variability ◽  
Larval Body ◽  
Influence Of Temperature ◽  
Cancer Pagurus ◽  
Influence Of Temperature On

The influence of temperature on larval survival and development was studied in the edible crab, Cancer pagurus, from a population off the island of Helgoland, North Sea. In rearing experiments conducted at six different temperatures (6°, 10°, 14°, 15°, 18° and 24°C), zoeal development was only completed at 14° and 15°C. Instar duration of the Zoea I was negatively correlated with temperature. A model relating larval body mass to temperature and developmental time suggests that successful larval development is possible within a narrow temperature range (14° ± 3°C) only. This temperature optimum coincides with the highest citrate synthase activity found at 14°C. A comparison for intraspecific variability among freshly hatched zoeae from different females (CW 13–17 cm, N = 8) revealed that both body mass and elemental composition varied significantly. Initial larval dry weight ranged from 12.1 to 17.9 μg/individual, the carbon content from 4.6 to 5.8 μg/individual, nitrogen from 1.1 to 1.3 μg/individual, and the C:N ratio from 4.1 to 4.4. A narrow larval temperature tolerance range of C. pagurus as well as the indication of intraspecific variability in female energy allocation into eggs may indicate a potential vulnerability of this species to climate change. Large-scale studies on the ecological and physiological resilience potential of this commercially fished predator are needed.

Influence of Temperature on Hydraulic Conductivity in Compacted Bentonite

1997 ◽  
Vol 506 ◽  
Author(s):  
W. J. Cho ◽  
J. O. Lee ◽  
K. S. Chun
Keyword(s):  
Hydraulic Conductivity ◽  
Influence Of Temperature ◽  
Temperature Range ◽  
Compacted Bentonite ◽  
Influence Of Temperature On ◽  
Water Saturated ◽  
Increasing Temperature ◽  
Good Agreement

ABSTRACTThe hydraulic conductivities in water saturated bentonites at different densities were measured within temperature range of 20 to 80 °C. The results show that the hydraulic conductivities increase with increasing temperature. The hydraulic conductivities of bentonites at the temperature of 80 °C increase up to about 3 times as high as those at 20 °C. The measured values are in good agreement with those predicted. The change in viscosity of water with temperature contributes greatly to increase of hydraulic conductivity.

The influence of temperature on the succession of redial and cercarial generations of Fasciola gigantica in a snail host

Parasitology ◽  
1964 ◽  
Vol 54 (1) ◽  
pp. 59-65 ◽  
Author(s):  
J. A. Dinnik ◽  
N. N. Diknik
Keyword(s):  
Larval Development ◽  
Low Temperatures ◽  
First Generation ◽  
Cold Season ◽  
Snail Host ◽  
Fasciola Gigantica ◽  
Natural Conditions ◽  
Influence Of Temperature ◽  
Cercarial Production ◽  
Influence Of Temperature On

Experiments on the larval development of Fasciola gigantica carried out under natural conditions have shown that at temperatures of 16° C. or less the rediae did not produce cercariae. The first-generation rediae, developed from the sporocyst, and all the rediae of subsequent generations produced only daughter rediae and did not change over to the production of cercariae as long as the low temperatures of the cold season lasted.As soon as the cold season ended and the temperature of the water in the aquaria containing the infected snails rose to a mean maximum of 20° C. all the rediae switched from redial to cercarial production.

Influence of Temperature on Intratrack Processes and Ps Formation and Behaviour in Liquid Water

2008 ◽  
Vol 607 ◽  
pp. 213-217 ◽  
Author(s):  
Sergey V. Stepanov ◽  
Gilles Duplâtre ◽  
Vsevolod Byakov ◽  
V.S. Subrahmanyam ◽  
Dmitry Zvezhinskiy ◽  
...  
Keyword(s):  
Positron Annihilation ◽  
Liquid Water ◽  
Radical Reactions ◽  
Influence Of Temperature ◽  
Positron Annihilation Lifetime ◽  
Temperature Range ◽  
Diffusion Controlled ◽  
Temperature Dependences ◽  
Influence Of Temperature On

Positron annihilation lifetime (PAL) spectra are measured in liquid water in the temperature range 2 – 930C. The spectra are treated by taking into account intratrack reactions and assuming that radical reactions with Ps are diffusion-controlled (the respective temperature dependences obeying the Stokes-Einstein law). Equilibrium Ps bubble parameters are obtained.

The Effect of Sintering Temperature to the Properties of Zinc Oxide

2013 ◽  
Vol 795 ◽  
pp. 419-423 ◽  
Author(s):  
J.H. Lim ◽  
C.K. Yeoh ◽  
Pei Leng Teh ◽  
W.M. Arif ◽  
A. Chik
Keyword(s):  
Thermal Conductivity ◽  
Zinc Oxide ◽  
Thermal Properties ◽  
Solid State ◽  
Sintering Temperature ◽  
Solid State Method ◽  
Influence Of Temperature ◽  
Temperature Range ◽  
Influence Of Temperature On ◽  
State Method

In this paper, different sintering temperature used to study the influence of temperature on the structural and thermal properties of zinc oxide (ZnO). On this research, the sample was prepared by solid-state method for zinc oxide (ZnO) at different sintering temperature which was 700°C, 800°C and 900°C. It was observed that the density of bulk ZnO that sintering at 900°C had the higher value of density 5.03 g/cm3. The microhardness of the bulk ZnO had a higher measurement 397.3 Hv after sintered at 900°C. ZnO that sintering at 900°C had been observed that had thermal conductivity 1.1611W/cm-K in the sintering temperature range 700°C to 900°C.

EFFECT OF CONSTANT TEMPERATURES ON THE NUMBER OF LARVAL INSTARS OF THE ORIENTAL FRUIT MOTH, GRAPHOLITHA MOLESTA (LEPIDOPTERA: TORTRICIDAE)

1978 ◽  
Vol 110 (6) ◽  
pp. 623-626 ◽  
Author(s):  
W. P. Roberts ◽  
Jean R. Proctor ◽  
J. H. H. Phillips
Keyword(s):  
Larval Development ◽  
Laboratory Tests ◽  
Mixed Population ◽  
Oriental Fruit Moth ◽  
Larval Instars ◽  
Influence Of Temperature ◽  
Grapholitha Molesta ◽  
Influence Of Temperature On

AbstractLaboratory tests, at constant temperatures, were conducted to evaluate quantitatively the influence of temperature on development of the Oriental fruit moth, Grapholitha molesta (Busck). The results showed that at the highest temperature (30°C) some larvae had four instars and some had five, indicating a mixed population. Fifth instar larvae developed only at the highest temperature (30°C) where larval development was also most rapid. It can, therefore, be assumed that the Oriental fruit moth has four distinct larval instars when reared in the laboratory at 15°–24 °C.

Influence of Temperature on Prespinning Eonymphs of the Swaine Jack-Pine Sawfly, Neodiprion swainei Midd. (Hymenoptera: Diprionidae)

1964 ◽  
Vol 96 (11) ◽  
pp. 1450-1457 ◽  
Author(s):  
J. G. Pilon ◽  
H. A. Tripp ◽  
J. M. McLeod ◽  
S. L. Ilnitzky
Keyword(s):  
Population Dynamics ◽  
Laboratory Experiments ◽  
Prime Factor ◽  
Close Correlation ◽  
Optimum Temperature ◽  
Influence Of Temperature ◽  
Pine Sawfly ◽  
Field Investigations ◽  
Influence Of Temperature On ◽  
Time Required

AbstractLaboratory experiments at various constant temperatures indicate a theoretical threshold of about 40°F. for spinning of cocoons by eonymphal larvae of Neodiprion swainei Midd. As temperatures fall below 52.5°F. the increase in mortality and time required to spin is pronounced. The optimum temperature is estimated to be around 60°F. Field investigations for three consecutive years show a close correlation between rate of spinning and temperature. Temperature is considered as a prime factor influencing the spinning of cocoons and is possibly one of the more important factors governing the population dynamics of N. swainei in the Province of Quebec.

The influence of temperature on selected strength properties of furniture particleboard

2019 ◽  
Vol 108 ◽  
pp. 128-134
Author(s):  
PIOTR BORYSIUK ◽  
ANNA TETELEWSKA ◽  
AURIGA RADOSŁAW ◽  
IZABELLA JENCZYK-TOŁŁOCZKO
Keyword(s):  
Strength Properties ◽  
Large Decrease ◽  
Influence Of Temperature ◽  
Temperature Range ◽  
Influence Of Temperature On ◽  
Negative Effect

The influence of temperature on selected strength properties of furniture particleboard. As a part of the study, the influence of temperature on selected properties of furniture particleboard was tested. P2 type industrial particleboards in three finishing options: raw boards (1), boards covered with melamine film in white (2) and black (3) (10 samples per variant) have been subjected to temperatures from -20oC to +120oC, at 10oC intervals. The Time of exposure for individual temperatures was 7 days. MOR, MOE and IB were determined for tested boards. It has been shown that temperatures above 50oC have a negative effect on strength properties of boards. A large decrease in all tested parameters was observed in the temperature range from +60oC to +120oC. It was also noted that finishing boards with melamine film did not improve their durability.

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