Micro prefix

Most calorimeters used in biochemical work and in studies of living cells and tissue pieces are usually microcalorimeters. This term is not well defined but the micro- prefix is primarily used for calorimeters with a thermal power sensitivity of 1 iW or better. The volume of a microcalorimetric (batch) vessel is usually 1-25 ml. It is common, and frequently suitable, to use typical microcalorimeters at a reduced sensitivity, for example, in work on fast growing microbial suspensions or... 

Prefixes used for powers of 10 are 10 mega M 10 milli m micro jj. 

Prefix deci- centi- milli- micro- nano- pico- fcmto- atto- zepto-... 

A prefix meaning large as in macromolecular , applied to the molecule of a high polymer. See Micro. 

Note 2 The term domain may be qualified by the adjective microscopic or nanoscopic or the prefix micro- or nano- according to the size of the linear dimensions of the domain. Note 3 The prefixes micro-, and nano- are frequently incorrectly used to qualify the term phase instead of the term domain hence, microphase domain , and nanophase domain are often used. The correct terminology that should be used is phase microdomain and phase nanodomain. 

In principle, the long-term stability can be greatly improved by replacing the internal (macro)emulsion by a wawoemulsion or, better still, a thermodynamically stable micro-emulsion. (We note that, in this context, the prefix micro denotes an entity that is smaller than nano )... 

One of the ways we will learn to express quantities in Chapter 1 is by using prefixes such as mega for million (I06), micro for one-millionth (10-6). and atto for 10-18. The illustration shows a signal due to light absorption by just 60 atoms of rubidium in the cross-sectional area of a laser beam. There are 6.02 X 1023 atoms in a mole, so 60 atoms amount to 1.0 X 10-22 moles. With prefixes from Table 1-3, we will express this number as 100 yoctomoles (ymol) or 0.1 zeptomole (zmol). The prefix yocto stands for I0-24 and zepto stands for 10-21. As chemists learn to measure fewer and fewer atoms or molecules, these strange-sounding prefixes become more and more common in the chemical literature. 

WFor very large or very small quantities, commonly used prefixes represent amounts that vary by three powers of 10, for example, milli, micro, nano, and pico (10 3,10 6,10 9, and 10 l2, respectively). 

Microfluidics is about the flow of tiny amounts of liquids. The prefix micro indicates that at least in two dimensions, the liquid should be confined in micrometer dimensions. If we are, for instance, dealing with a channel, its width or diameter should be below 100 /tm to earn the title microchannel . Please note that a microliter is a relatively large volume in microfluidics since it is equal to the volume of (1 mm)3. 

The prefix multipliers are given in Table 1.2. It is crucial that you learn all the multipliers, as well as their numerical meanings and abbreviations. Notice some abbreviations are capital letters, while others are lower case letters. It is important that you not confuse these. The letter m is particularly overused as an abbreviation. Notice that the abbreviation for micro is the Greek letter mu (p), which is equivalent to the English letter m. 

Some databases use the standard prefixes of micro (u), nano (n), and pico (p) for values that would require several zeros after the decimal delimiter to indicate the correct order of magnitude. While such prefixes are correct, they can also lead to typographical mistakes (the letters m and n are beside each other on most keyboards) that may be difficult to spot. For example, an earlier version of the RTECS showed the oral rat LD50 value for tetrachlorodibenzodioxin (TCDD) as 24,000 mg/kg, while the original source reported it as 24 ng/kg. At the same time, a number of zeros can also lead to mistakes by the addition or loss of a zero. An example of this can be found in the database by Wauchope et al. (1992), which gives a literature value for the solubility of the insecticide cyromazine as 13,600 mg/L, but then provides a recommended value of 136,000 mg/L. Only after comparison of these values will the erroneous recommended value become apparent. 

C For A, the prefix micro— indicates 10-6. 32 micrograms is 0.000032 g. For B, the two measurements do not have the same meaning because they differ in the number of significant figures. 26 nm is 2.6x10-8 m. The symbol "n" for nano— indicates 10-9. For C and D, unit conversions between cubic meters and liters are required. 

The prefix micro originates from the greek word Lio< , meaning "small" but not implying any well-defined length scale. 

The prefix micro-, for example, is useful when determining the parts per million of an ion or substance in drinking water. You have already used the... 

Micro-. A prefix meaning small , as in microscope , micrometer , micrograph . Also, a metric prefix meaning 10 6. See macro-... 

What exponential number best represents each of the following metric prefixes (a) deci, (b) nano, (c) centi, d) micro, (e) miUi, and (f) kilo... 

In trace analysis, the units used for component content should be appropriate for the amount. The most proper system is to give the mass fraction (wb) of the trace component (B) in SI units with the appropriate prefix milli- (10 ), micro- (10 ), nano- (10 ), pico- femto- (10 ), or atto- (Table 1.1). The... 

Micro.—A prefix of Greek origin meaning small. 

The defining event of a radioactive nuclide is the transformation of its nucleus into the nucleus of another species, that is, radioactive decay. The number of nuclear transformations occurring per unit of time is called activity . Sometimes radioactivity is used instead of activity . The traditional unit of activity has been the Curie (Ci), which is equal to 3.7 X 10 ° nuclear transformations per second. The conversion of radiation units to the international system (Sysfme International d Unit or SI) has now taken place in the United States. The more fundamental unit of activity, the Becquerel (Bq), equal to 1 nuclear transformation per second, has replaced the Curie. Both units of activity are modified by prefixes such as kilo-, milli-, and micro- to achieve standard multiples of the fundamental unit. A listing of the most commonly used prefixes is given in Table 1. 

Michaelis-Menton equation/kinetics This equation, which is central to enzymology, describes the relationship between the initial rate of reaction (v) and the substrate concentration (Q. It gives the initial rate of reaction as v = V ax C/(K +C) where V ax is the maximum velocity of reaction, C is the concentration of substrate and is the Michaelis-Menton constant. C is equal to the Michaelis-Menton constant when vis 50% of micro- A prefix meaning small. 

According to the IUPAC classification, porous solids can be arranged in three main categories, depending on their pore size micropore (<2nm), mesopore (2 50nm), and macropore (>50nm). Here, the prefix meso- describes a state between the micro-and the macro-. Mesopore sizes are in the nanometer region therefore, nanoporous is frequently used in its place in the literature. Sometimes the term ultra-micropore is used for pore sizes smaller than 0.7 nm. The pore sizes discussed here represent the diameter or the width of the pore, not the radius. 

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