scholarly journals The effect of temperature on days of flower initiation and flowering of tobacco plants. : with special reference to its varietal difference

1957 ◽  
Vol 7 (1) ◽  
pp. 31-38
Author(s):  
Yozo MURAOKA ◽  
Tadaomi TOKITSU ◽  
Masaru OKA
Keyword(s):  
Special Reference ◽  
Varietal Difference ◽  
Effect Of Temperature ◽  
Flower Initiation ◽  
Tobacco Plants

Flower initiation in pasture legumes. I. Factors affecting flower initiation in Trifolium subterraneum L.

1955 ◽  
Vol 6 (2) ◽  
pp. 211 ◽  
Author(s):  
Y Aitken
Keyword(s):  
Low Temperature ◽  
Subterranean Clover ◽  
Trifolium Subterraneum ◽  
Cold Period ◽  
Effect Of Temperature ◽  
Flower Initiation ◽  
Temperature Level ◽  
Factors Affecting ◽  
Pasture Legumes ◽  
Precise Knowledge

The value of the annual legume Trifolium subterraneum L. (subterranean clover) in Australian agriculture warrants more precise knowledge of factors affecting flowering and prolific seeding. The effect of temperature and photoperiod on flower initiation in early and later flowering varieties has been investigated in an effort to determine the geographical limits of the use of subterranean clover in Australia. At any time of sowing, the length of the growing season of a variety depends greatly on the variety's response to the temperature level and to the photoperiod of the first few weeks after germination. In all varieties of subterranean clover so far examined flower initiation is accelerated by a period of low temperature. In the later varieties, flower initiation is prevented by an insufficient period of low temperature. The length of the necessary cold period is shortened under longer photoperiod. Early varieties are early flowering because they do not require so long a cold period or so low a temperature as late varieties.

scholarly journals Protease-producing microorganisms inhabiting salted fish (Moloha) with special reference to protease activity of Bacillus subtilis

2014 ◽  
Vol 63 (3-4) ◽  
pp. 303-307 ◽  
Author(s):  
M. H. Abd-Alla ◽  
S. A. Omar ◽  
M. A. El-Nagdy
Keyword(s):  
Bacillus Subtilis ◽  
Salt Tolerance ◽  
Metal Ions ◽  
Special Reference ◽  
Protease Activity ◽  
Enzyme Production ◽  
Effect Of Temperature ◽  
Protease Production ◽  
Salted Fish ◽  
Tanning Industry

The investigation was designed to isolate and identify the proteolytic microorganisms inhabiting salted fish. <i>Bacillus subtilis</i> was chosen as the most promising protease producer. Some properties of the crude protease are presented, the effect of metal ions on protease production has been studied. It was shown that Ca<sup>2+</sup> and Mg<sup>2+</sup> stimulated, while Co<sup>2+</sup> , Zn<sup>2+</sup> and Cu<sup>2+</sup> inhibited the enzyme production. The effect of temperature and pH and salt tolerance have also been studied. Protease activity was stable in 25% NaCl. The favourable characteristics of the enzyme might have extensive application in laundry detergents and in tanning industry.

Properties of toad skin Na-K-ATPase with special reference to effect of temperature

1976 ◽  
Vol 231 (5) ◽  
pp. 1356-1363 ◽  
Author(s):  
YS Park ◽  
SK Hong
Keyword(s):  
Enzyme Activity ◽  
Special Reference ◽  
Incubation Temperature ◽  
Potent Inhibitor ◽  
Effect Of Temperature ◽  
Toad Skin ◽  
Constant Ph ◽  
Atpase System ◽  
Appreciable Variation ◽  
Optimal Ph

The NA-K-ATPase of toad skin was characteristically sensitive to Na, K, and ATP. It was not affected by amiloride, vasopressin, cAMP, and thyroxine, but stimulated by insulin. Ouabain, a potent inhibitor at 37 degrees C, did not inhibit the enzyme activity significantly at 23 degrees C. The optimal pH for the enzyme activity increased as temperature decreased. However, the optimal OH-/H+ ratio of the medium remained constant at 16 regardless of temperature. The Km for ATP remained unchanged between 37 and 8 degrees C if the OH-/H+ ratio was held constant at 16, but increased as temperature decreased if the pH of the medium was held constant at 7.4. The enzyme activity showed no appreciable variation between 37 and 20 degrees C with a constant OH-/H+ ratio of 16, whereas it decreased logarithmically at a constant pH of 7.4 over the same temperature range. These results indicate the presence of a typical Na-K-ATPase system in toad skin and that the enzyme is in the most active catalytic state at a fixed level of OH-/H+ ratio in the medium regardless of incubation temperature.

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