1. The TM mark does not protect trademarks. It is different from R. TM is the abbreviation of TradeMark, which includes both the registered trademark R and the direct use of unregistered trademarks that have not been approved by the Trademark Office. .

2. DNA in its natural state will denature at relatively high temperatures (70-90°C). At this time, the double helix unwinds into single strands and turns into random coils. This is similar to the melting phenomenon of general crystals. The temperature range that causes DNA to "melt" is relatively narrow, only a few degrees. The temperature at which the color enhancement effect reaches half of its maximum value is usually called the melting temperature (or melting point) of DNA, represented by the symbol Tm.

3. TM is an extremely rarely used unit of length. 1 Tm is equal to 10^12 meters which is equal to 6.7 astronomical units.

Extended information

Some distances that can be measured in meters

1.079 Tm = 7.2 AU = 1 light hour

1.4 Tm = 9.5 AU =?Distance between Saturn and the Sun

2.0 Tm = 13 AU = Diameter of the largest known star KY Cygni

2.5 Tm = 16.7 AU =Canis Major Approximate diameter of VY (maximum 2.9 Tm or 19.5 AU)[1]

2.9 Tm = 19 AU =?Distance from Uranus to the Sun

4.4 Tm = 30 AU =?Perihelion of Pluto Distance from the Sun

Baidu Encyclopedia—TM

Baidu Encyclopedia—Tm value

Baidu Encyclopedia—TM