A .PK after a stock ticker means it's listed by the OTC Markets Group Inc. This company lists stocks, usually over-the-counter securities, from market-makers and brokers who use the group to list selling prices as well ask and bid prices.
1 It may usually involves learning qualitative research methods such as literary analysis and ethnography.  Bachelor of Science (BS). This degree may usually requires a majority of coursework be taken in the sciences, such as life sciences, physical sciences, or mathematical sciences. It may be more focused on quantitative analysis, such as statistics and other forms of number-crunching.
The College of Chemistry also offers joint majors in Chemical Engineering and Materials Science and Engineering, and in Chemical Engineering and Nuclear Engineering. The Bachelor of Science Degree in Chemical Biology is similar to the B.S. Degree in Chemistry. It is intended for students who are interested in a range of careers including research in the biological sciences, medicine, pharmacology, and bioengineering.