Creep deformation of low-alloy Cr-Mo-V steel under constant and cycling temperature conditions

Metal Science ◽  
1979 ◽  
Vol 13 (2) ◽  
pp. 49-54 ◽  
Author(s):  
B. Walser
Keyword(s):  
Creep Deformation ◽  
Temperature Conditions ◽  
Cycling Temperature

Absence of metabolic acclimation to cycling temperature conditions in the goldfish

1988 ◽  
Vol 43 (1) ◽  
pp. 121-122 ◽  
Author(s):  
Roberto Refinetti ◽  
Kathleen Zylan Refinetti
Keyword(s):  
Temperature Conditions ◽  
Cycling Temperature

Water-electrolyte balance in goldfish Carassius auratus, under constant and diurnally cycling temperature conditions

1982 ◽  
Vol 97 (1) ◽  
pp. 427-440
Author(s):  
A. H. Houston ◽  
T. F. Koss
Keyword(s):  
Constant Temperature ◽  
Ion Pairs ◽  
Electrolyte Balance ◽  
Phase Volume ◽  
Temperature Conditions ◽  
Goldfish Carassius Auratus ◽  
The Stability ◽  
Plasma Magnesium ◽  
Increasing Temperature ◽  
Cycling Temperature

1. The effects of acclimation to constant and diurnally cycling temperatures upon water-electrolyte regulation were examined in goldfish held at 20, 25, 30 and 25 +/− 5 degrees C, and sampled at 03.00, 09.00 15.00 and 21.00 h. Plasma and epaxial muscle levels of Na, K, Ca, Mg, Cl and water were determined. Using Cl space as an indicator of extracellular phase volume, mean cellular cation concentrations were estimated. 2. Fish held at constant temperature exhibited significant diurnal variations in all ions except plasma magnesium and muscle potassium. With the exception of muscle choride, however, the occurrence of peak and/or minimum concentrations tended to be inconsistent in relation to specific sampling times. Somewhat more regularity was apparent in terms of dark or light periods. 3. Under constant temperature conditions plasma Cl increased with increasing temperature, while Na declined. Plasma magnesium was consistently higher at 25 degrees C than at either 20 or 30 degrees C. This was true of muscle Mg as well and, generally, also of Na, K and Cl. Water content tended to rise at higher temperatures in these animals, as did cellular phase volume, while extracellular phase volume was reduced. 4. Exposure to cycling temperatures was associated with a number of significant departures from the pattern seen at constant temperature. Ionic concentrations tended to be lower. By comparison with animals sampled at constant temperature and comparable times, diurnal stability was greater. In several instances (e.g. muscle Cl- and K+, cellular and extracellular phase volumes) variations with temperature were significantly different. This was also the case with ion pairs such as K and Na, and Ca and Mg. 5. These observations raise obvious questions regarding the validity of earlier descriptions of water-electrolyte status in species normally exposed to fluctuating temperatures. The variations seen under cycling temperature conditions, however, appeared to be adaptively appropriate. Reductions in plasma ion levels, for example, would tend to reduce costs of ionic regulation. The stability of plasma: cellular K concentrations should desensitize muscular excitability in relation to changing temperature conditions. This was also true of cellular levels of generally stimulating (Mg, K) and generally inhibitory ions (Ca, Na) known to influence metabolic processes.

STRUCTURAL ANISOTROPY OF AMORPHOUS ALLOYS INDUCED BY MECHANICAL CREEP DEFORMATION

1985 ◽  
Vol 46 (C8) ◽  
pp. C8-623-C8-627 ◽  
Author(s):  
Y. Suzuki ◽  
J. Haimovich ◽  
T. Egami
Keyword(s):  
Creep Deformation ◽  
Amorphous Alloys ◽  
Structural Anisotropy ◽  
Mechanical Creep

Temperature conditions and level of organic metamorphism in the south-eastern part of the Terek-Caspian trough

2019 ◽  
pp. 18-22
Author(s):  
А.А. Feyzullayev ◽  
◽  
G.G. Ismaylova ◽  
A.N. Huseynova ◽  
◽  
...  
Keyword(s):  
The South ◽  
South Eastern ◽  
Temperature Conditions

MODELING OF THE WORK OF RUBBER SEALS OF THE ROLLING STOCK BRAKE NETWORK IN THE LOW TEMPERATURE CONDITIONS

2017 ◽  
Vol 3 (55) ◽  
Author(s):  
Manuilov N.I. ◽  
◽  
Ivanov P. Yu. ◽  
Dulsky E. Yu. ◽  
◽  
...  
Keyword(s):  
Low Temperature ◽  
Rolling Stock ◽  
Temperature Conditions

Pengaruh Penambahan Molases Pada Kulit Pisang Kapendis Untuk Media Produksi Xilanase B.Stearothermophillus DSM 22

2019 ◽  
Vol 15 (3) ◽  
Author(s):  
Trismillah
Keyword(s):  
Enzyme Activity ◽  
Ammonium Sulfate ◽  
Banana Peel ◽  
Partial Purification ◽  
Temperature Conditions ◽  
Cavendish Banana ◽  
Working Volume ◽  
Initial Ph ◽  
Xylanase Enzyme

Cavendish banana peel can be used as a substitute for the expensive xylan, while molasses than as a source of carbon as well as nitrogen, minerals and nutrients needed for the growth of microbes that can produce the enzyme. Xylanase produced from Bacillus stearothermopillus DSM 22, using media cavendish banana peels with the addition of molasses 1%, 2%, and 3%. Fermentation is done in a shaker incubator at 550C temperature conditions, initial pH 8, and 250 rpm agitation. The result showed the highest enzyme activity of 4,14 ± 0,16 U/mL min., on the addition 2% molasses after 24 hours. Further fermentation carried out in the fermenter working volume of 3.5 liters, with the condition of temperature 550C, pH 8, aeration 1 vvm, agitation 250 rpm, the highest spesific enzyme of activity of 51,62 ± 0,16 U/mg after 24 hours. Partial purification of xylanase enzyme fermentation is done with the results of microfiltration, ultrafiltration, ammonium sulfate (0-80%) and dialysis. There is an increase in the purity of the enzyme at each stage of purification, the highest purity on dialysis 3.23 times of crude enzymes.Kulit buah pisang kapendis dapat digunakan sebagai pengganti xilan yang harganya mahal, sementara molases selain sebagai sumber karbon serta nitrogen, mineral dan nutrisi dibutuhkan untuk pertumbuhan mikroba yang dapat menghasilkan enzim. Xilanase yang dihasilkan dari Bacillus stearothermopillus DSM 22, menggunakan media kulit pisang kapendis dengan penambahan molase 1%, 2%, dan 3%. Fermentasi dilakukan dalam shaker inkubator pada temperatur 550C, pH awal 8, dan agitasi 250 rpm. Hasilnya menunjukkan aktivitas enzim tertinggi 4,14 ± 0,16 U/mL min., pada penambahan 2% molases setelah 24 jam. Selanjutnya fermentasi dilakukan di dalam fermentor, volume kerja dari 3,5 liter, dengan kondisi temperatur 550C, pH 8, aeration 1 vvm, agitasi 250 rpm, aktivitas spesifik tertinggi 51,62 ± 0,16 U/mg setelah 24 jam. Pemurnian parsial fermentasi enzim xilanase dilakukan dengan hasil mikrofiltrasi, ultrafiltrasi, amonium sulfat (0-80%) dan dialisis. Ada peningkatan kemurnian enzim pada setiap tahap pemurnian, kemurnian tertinggi pada dialisis 3,23 kali dari enzim kasar.Keywords: Xylanase, B. stearothermophillus DSM 22, Cavendish banana peel, molasses, enzyme activity

Seasonal dynamics of phytoand zooplankton of an eutrophicated lake in years with different water content and temperature conditions

2018 ◽  
Vol 53 (3) ◽  
pp. 29 ◽  
Author(s):  
Irina S. Trifonova ◽  
Anna L. Afanas`eva ◽  
Nataliya V. Rodionova ◽  
Keyword(s):  
Water Content ◽  
Seasonal Dynamics ◽  
Temperature Conditions
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