It is a dense minefield of rules and regulations that governs everything from the size of windows to the pitch of rooftops, the depth of stair treads to the gradient of slopes – even where to put light switches.
It tracks your latitude, longitude and altitude, so that when you have reached your destination, it knows exactly how far and how fast you ran, as well as the gradients of the slopes you climbed.
To investigate this possibility, we performed 1000 simulations in which we randomly identified a cut-off for each district and then looked at the difference in the gradients of the slopes before and after the random cut-off points.
The optimal separation was predicted at pH 3, with a gradient starting at 32% of methanol and a gradient slope of 0.42%/min.
The gradient strength of the magnet was 45 mT/m with a maximal gradient slope of 200 T/m per s.
The optimal condition was predicted at a gradient slope of 3.8% min−1 to linearly modify the modifier proportion between 5 and 40%, an isocratic time of 3 min, a concentration of TFA of 25 mM, and a temperature of 60.5 °C.
The absolute fluorescence QY of the nanocrystals was determined by comparison with a freshly prepared solution of Rhodamine 6G in ethanol (QY 95%), using the following formula: with Φ being the QY, grad the gradient (slope) of the plot of the integrated fluorescence intensity vs. absorbance, and n the refractive index of the solvent (1.375 for hexanes, 1.36 for ethanol).
For example, yeast cells may not want the width of the mating projections to be too sensitive to variations in the concentration or gradient slope of mating pheromone.
We tested the model at a 10-fold faster speed and a 10-fold slower speed for the heterotrimeric G-protein cycle with a gradient slope of L slp = 0.01 nM μm-1 (L mid = 10 nM, concentration at cell midpoint) and σ = 1.
In the study of Dictyostelium, van Haastert and Postma [ 2] derived an expression for the signal-to-noise ratio (SNR) of sensing a chemical gradient in terms of the slope of the gradient, receptor affinity, integration time, and intracellular noise.
