Division of Exponential Numbers

As with addition and subtraction, multiplication and division of exponential numbers on a calculator or computer are simply a matter of (correctly) pushing buttons. For example, to solve 

In multiplication and division of exponential numbers, the digital portions of the numbers are handled conventionally. For the powers of 10 in multiplication exponents are added algebraically, whereas in division the exponents are subtracted algebraically. Therefore, in the preceding example, 

Example Perform the calculation below without using the exponential notation feature of the calculator  

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Multiplication and division of exponential numbers having the same base are accomplished by adding and subtracting the exponents. For example,... 

Division of two numbers expressed in exponential notation involves normal division of the initial numbers and subtraction of the exponent of the divisor from that of the dividend. For example,... 

The basic operations of real numbers include addition, subtraction, multiplication, division, and exponentiation (discussed in Chapter 7 of this book). Often, in expressions, there are grouping symbols—usually shown as parentheses—which are used to make a mathematical statement clear. In math, there is a pre-defined order in which you perform operations. This agreed-upon order that must be used is known as the order of operations. 

A major benefit of presenting numbers in scientific notation is that it simplifies common arithmetic operations. The simplifying abilities of scientific notation cire most evident in multiplication and division. (As we note in the next section, addition and subtraction benefit from exponential notation but not necesscirily from strict scientific notation.)... 

When bacteria are inoculated into growth medium, there is a delay (lag phase) before division and exponential growth ensue. The rate of exponential growth is a characteristic of the bacterial strain, the temperature, and the nutritional environment. The amount of DNA per nuclear body remains constant at various growth rates, although cell mass and average number of nuclei per cell are functions of the growth rate. 

Therefore, the growth rate defined as the change of cell number with time is the slope of the CN versus t curve, while the division rate is the slope of the log2CN versus t curve. As explained later, the division rate is constant during the exponential growth period, while the growth rate is not. Therefore, these two terms should not be confused with each other. 

Prekey generation is of the same order of complexity as key generation in ordinary digital signature schemes It is dominated by the primality tests needed for the generation of two primes, q and p. This means approximately one exponentiation per number tested for primality with the Rabin-Miller test. Hence the number of exponentiations is determined by the density of primes of the chosen size (see Section 8.1.5) however, many numbers can be excluded by trial division as usual. 

The multiplication and division of numbers written in scientific notation can be done qnite simply by using some characteristics of exponentials. Consider the following multipUcation ... 

In phase B it is assumed that the inoculum has adapted itself to the new environment and growth then proceeds, each cell dividing into two. Cell division by binary fission may take place every 15-20 minutes and the increase in numbers is exponential or logarithmic, hence the name log phase. Phase C, the stationary phase, is thought to occur as a result of the exhaustion of essential nutrients and possibly the accumulation... 

Note that this equation will only apply during the initially exponential growth phase. As the number of cells becomes much greater, the daughter cells compete for limiting quantities of one or more nutrients. This will reduce the efficiency of cell division, and the proliferation curve will reach a plateau that is often called the stationary growth phase. 

Normal animal cell growth curve pattern, in which p is the specific cell growth rate. Lag phase (A) represents the culture adaptation period, followed by an exponential cell growth phase (B) until the attainment of a stationary or plateau phase (C), in which there is no increase in cell number. The culture reaches the senescence phase (D) when the percentage of cells in division becomes lower than the percentage of cells dying. 

Growing cells undergo regular divisions about once every 24 h. In between divisions (i.e. during interphase) they double their complement of DNA during a distinct period known as the DNA synthetic or S-phase. S-phase is separated from cell division or mitosis (M) by two gaps (G1 and G2) (see Fig. 10.1). Cells which are not restricted in any way will proceed indefinitely around this cycle (the cell cycle) and are said to be in exponential growth as the cell number doubles on each circuit. 

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