Growth medium, definition

In 1973, Tatro et al (11)examined the qualitative and quantitative changes in essential oil composition of leaf oils obtained from Juniperus occidentalis, J. osteosperma and J, californica, and found that neither growth medium or seasonal variation had a significant effect on oil composition. By contrast, they observed a definite diurnal cycling which they attributed to the fluctuation in air temperature over a twenty-four hour period. Six years later, Hopfinger et al (16) examined the diurnal variation in the leaf oil of Citrus sinensis (L.) Osbeck. The authors found that there was a two-fold diurnal change in oil... 

In summary, these studies show that V,o weakly inhibits cell growth. Regardless of what pH the yeast are incubated, we show that cell-associated vanadium(IV) is formed. Furthermore at pH 6.5 cell-associated V,o is definitely seen in cells exposed to V4 in the growth medium. We propose that V,o is extmded into the medium. To the best of our knowledge, this is the first experimentally documented observation of the formation of an oxometalate in a biological system. 

A competition experiment was carried out to determine whether the presence of added hercynine would decrease the incorporation of histidine-2-C into ergothioneine by N. crassa. No effect could be found. It was possible that this was due to impermeability of the cell wall to hercynine. Since W. Feldman in our laboratory had found that N. crassa in growing cultures is relatively impermeable to ergothioneine, but becomes more permeable when it is starved, the same technique was tried with hercynine. When the competition experiment was carried out with mycelium suspended in water rather than growth medium, a definite effect was observed, with a marked decrease in the uptake of histidine- -Ci in the presence of hercynine (Fig. 5). 

Precipitation of ferric hydroxide gel was also observed in the preparation of spindlelike hematite (a-Fe203) particles in a dilute ferric chloride solution in the presence of phosphate (9). In this case, however, the positive role of the gel was not definite since similar uniform hematite paricles were obtained as well in homogeneous systems in the presence of the same anions (9). Also, Hamada and Matijevic (10) prepared uniform particles of pseudocubic hematite by hydrolysis of ferric chloride in aqueous solutions of alcohol (10-50%) at I00°C for several days. In this reaction, it was observed that acicular crystals of (3-FeOOH precipitated first, and then they dissolved with formation of the pseudocubic particles of hematite. The intermediate P-FeOOH appears to work as a reservoir of the solute to maintain an ideal supersaturation for the nucleation and growth of the hematite. Since the (3-FeOOH as an intermediate and the pseudocubic shape tire not peculiar to the alcohol/water medium... 

By definition, ESC is influenced by the level of the applied multiaxial stress, ft is expected that below an assigned value of stress in a specific medium ESC will not occur. Fatigue crack growth experiments at various constant levels of A K can be applied to study the influence of the crack-tip loading on the ESC behavior in a systematic way. As an example, cast CT specimens of PMMA (Mn = 4.6 x 105) were tested in air and IPA at different levels of AK (0.6, 0.7, 0.8, 0.9 MPa -v/m). The tests were performed as described earlier, with the application of the medium after a certain time of cyclic loading in air. From the plots of the crack length ratio vs. number of cycles, the following observations can be made (Fig. 23) ... 

The quantities with the primes are for the jet liquid, and the quantities without prime for the ambient liquid. A prime at the modified Bessel functions denotes the derivative with respect to the argument. Furthermore, the definition k = k + ico/v is used. The quantity kj exists for both liquids. It is therefore also distinguished by the prime. For this case of the instability of a liquid filament in an immiscible viscous host medium, an analytical expressimi for the non-dimensional wave number of the disturbance maximizing the growth rate does not exist. With simple numerical procedures, however, this growth rate may be easily obtained. We present this dispersion relation for completeness, but do not use it here, since we are interested in droplet formation in a gaseous medium. 

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