Integration methods for enzymatic reactions were applied to
transducer response vs. time curves which exhibit maxima, minima or
inflections. The difference between the integral of the time
dependent response and the initial response, often zero, is related
to the initial enzyme activity or substrate concentration. Fluorescence response curves which exhibit...
In biological models, advection is inherently a non-local process. Coupled with diffusion, it typically models chemotaxis, which is the response of bacteria to the presence of some chemo attractant. For example, E. coli cells use their flagella to probe their surroundings to determine where they should move. The advection-diffusion equation...
Optimum growth temperatures were determined for nine strains of Streptococcus thermophilus and ten strains of Lactobacillus bulgaricus, all commercial yogurt or yogurt
starter isolates. Optimum growth temperatures ranged from 35 C to 42 C for S.thermophilus strains, averaging 38.6. Optimum growth temperatures for L.bulgaricus strains ranged from 43 C to...
Using the counterflow virtual impactor, a new instrument for sampling cloud droplets, measurable levels of light-absorbing material were found to exist inside droplets in stratocumulus clouds off the coast of southern California. Eighty percent of the samples of droplet residue material had light absorption coefficients ranging from 6 to 20...
There is evidence that recent ecological changes in lakes and their watersheds can be detected from analysis of lake sediments. This study was initiated to correlate
changes in some sediment characteristics of four Oregon lakes with past cultural developments of the lakes and their watersheds. The lakes chosen for this...
The present investigation was undertaken to characterize a
number of strains of Lactobacillus bulgaricus and Streptococcus
thermophilus intended for use by a commercial starter supply
company. Thorough characterization of each culture was required in
order to combine compatible strains so that their usefulness in
Mozzarella cheese manufacture would be maximized....
Straight, radial, erosional channels and fan-like deposits of tephra develop around steep-sided cones and composite volcanoes, but are not characteristic features of shield volcanoes. The channels and deposits normally are formed by explosive volcanic density currents which originate as nuées adrentes or base surges. The physical processes of explosive volcanic...
Internally-pH-controlled, phosphate containing and non-phosphate
containing Italian bulk starter media were compared to
reconstituted nonfat dry milk and commercial bulk starter media
for their ability to support the growth and activities of
commercially frozen thermophilic lactic acid cultures. Cultures
grown in internally-pH-controlled media demonstrated superior
acid-production capability. The cheese made...