7 Matching Annotations
  1. Aug 2021
    1. ugust 14, 2021, rain was observed at the highest point on the Greenland Ice Sheet for several hours, and air temperatures remained above freezing for about nine hours. This was the third time in less than a decade, and the latest date in the year on record, that the National Science Foundation’s Summit Station had above-freezing temperatures and wet snow. There is no previous report of rainfall at this location (72.58°N 38.46°W), which reaches 3,216 meters (10,551 feet) in elevation. Earlier melt events in the instrumental record occurred in 1995, 2012, and 2019; prior to those events, melting is inferred from ice cores to have been absent since an event in the late 1800s
  2. May 2021
  3. Apr 2021
  4. Dec 2020
    1. Strive for a Tm between 50 and 65°C. One way to calculate Tm values is by using the nearest-neighbor method. Use the Tm calculator at http://www.basic.northwestern.edu/biotools/oligocalc.html, with values of 50 mM for salt concentration and 300 nM for oligonucleotide concentration
  5. Jun 2020
    1. Figure 6.1.46.1.4\PageIndex{4}: Temperature versus heat. The system is constructed so that no vapor evaporates while ice warms to become liquid water, and so that, when vaporization occurs, the vapor remains in the system. The long stretches of constant temperatures at 0oC0oC0^oC and 100oC100oC100^oC reflect the large amounts of heat needed to cause melting and vaporization, respectively.

      Figure 6.1.4 : Temperature versus heat. The system is constructed so that no vapor evaporates while ice warms to become liquid water, and so that, when vaporization occurs, the vapor remains in the system. The long stretches of constant temperatures at 0oC and 100oC reflect the large amounts of heat needed to cause melting and vaporization, respectively.