Monday, April 30, 2012

Heavy Heart

I have a heavy heart. I am grieving.... not because someone died. Its actually worse than that........

When I came down to San Diego in 1999 I contacted the chapter of my music group in San Diego. One of the first people I met was my friend Catherine. Except that she wasn't my friend back then.She had impeccably high standards of music performance and I didn't live up to those standards. And she let me know that. As the wife and mother of professional musicians and president of the San Diego Chorale Club she set herself apart in a competitive culture of music in San Diego.

As time went on I began to see Catherine's fun side. Although her standards were high, she was also incredibly enthusiastic, generous, motivating and involved in our musical group. She inspired me to be a better musician. I practiced really hard for my flute concerto and earned her trust to become my accompanist for a monthly meeting. I was truly honored to have her as my accompanist. This was in 2008.

I feel fairly certain she is responsible for my sword of honor back in 2006.Catherine was always very diligent about sending paperwork into national to recognize people who had given of their time and talents to the organization.

On Wednesday I went to a board and care down in Clairemont to visit Catherine. Although she recognizes me I cannot carry on a conversation with her. She just had another stroke and her Alzheimer's has progressed to the point where she has huge gaps in her memory. Her vitality is gone. She will no longer be able to attend SAI meetings.

And so I have a heavy heart. This kind of decline is worse than death really. The Catherine I knew is gone.

Saturday, April 14, 2012

Cancer's Epicentre- The Economist

There is an article in The Economist this week that helps me understand a bit more about why Carl Zimmer made the error that I pointed out in a previous post.

The article outlines a new explanation for cancer's mysterious genesis and proliferation throughout the human body. Its a similar article to the book review Carl wrote about epigenetics. I don't recall his book review focused specifically on cancer as a disease- it was more of a discussion about how gene therapy and epigenetics could combat a variety of conditions (I would need to reread it to be sure).

The article in The Economist mentions that genes are switched on and off by plastering the DNA or surrounding proteins with chromosomes containing clusters of acetyl and methyl groups. This would explain why Carl mentioned methylation as carbon, hydrogen and oxygen. He merely forgot to mention that the methylation can also sometimes be acetylation. Acetylation does, in fact, include oxygen. So- instead of getting the definition of methyl group wrong perhaps he forgot to include the additional functional group (acetyl). Then, carbon, hydrogen and oxygen would all be involved, as correctly noted in the article.

 Glad I got this ironed out. Didn't think Carl was prone to errors.

Friday, April 13, 2012

Surfactants: How does simple soap work?

I am currently reviewing a book about intellectual property for a trade publication. It specifically focuses on chemistry patents which I know very little about outside of my master's level knowledge of basic chemistry. Interestingly, I have learned about scientific patents in general from my involvement in The Association for Women in Science (AWIS). Several PhD level female scientists have taken the patent agent exam and worked for law firms as patent agents. It seems to be a logical, lucrative and practical solution to the problem of an educated woman in the business world. For some reason the patent/law world is able to accommodate women much better than academia or even industry science is able to do.

Partly for this reason, I volunteered to read and review the book for Technical Communication. This brings me to the focus of this post- surfactants. Apparently surfactants are used to solve a nanotechnology/quantum problem. This is fascinating to me because the two areas of science seem so distant from each other, yet apparently in this case, someone wrote a patent using surfactants for their more electricity/nano oriented problem. (This also gives you an idea of where I get ideas for these posts. Usually I'm reading about something that sparks my interest into writing about a related topic.)

Surfactants help make something intermix with something else. The most obvious example of this is when you are washing your dishes. (Believe me, I'm the queen of DLD right now as a stay-at-home mom- this is coined as DLD or "dinner, laundry, dishes") You have a stack of plates covered in greasy, leftover food. Hopefully, you remove the excess food before you place them in hot, soapy water to wash. Why not just hot water? In most cases, some of the grease is still left if you just wash them in hot water. On a molecular level, here is why:

The grease on the plates is full of hydrogen/carbon chains that have the properties of something  "hydrophobic." Generally, the chemical properties of carbon/hydrogen don't mix with the properties of water (made of hydrogen and oxygen). This is related to the concept of polarity/electronegativity that is discussed here in my other blog.Generally, polar compounds mix evenly with other polar compounds and nonpolar compounds (pure covalent compounds) mix with other nonpolar compounds. Water is extremely polar while any kind of grease or fat is extremely nonpolar.

The detergent molecules (surfactants) create an interface between the polar and nonpolar so that the grease molecules can be removed from the place.  The detergent generally has a polar head that will "stick" to the polar water molecules while it has a nonpolar carbon/hydrogen tail which will "stick" to the grease molecules. By intermixing with both polar and nonpolar components of the grease/water mixture the soap is able to engulf the grease and send it down the sink.


 As you can see in the picture, the left side of the soap molecule is a carbon/hydrogen chain while the right side (the head) has oxygen-containing functional groups. It is these oxygen functional groups that will intermix with the water while the greasy tail (left side) will combine with the grease on your plates.

Here is a picture of nonpolar greasy molecules in the same container with polar molecules:
My book likens it to a mixture of magnetic and nonmagnetic particles. Can you think of anything else that behaves this way?

I have discussed polarity and dipole moments in other posts. Here are links:
Electronegativity
Ionic and Covalent Bonding
VSEPR Shapes

Tuesday, April 03, 2012

Going to Tampa....

I'm currently preparing myself and my 9-month old daughter to fly to Tampa for a short vacation. The preparation makes me nostalgic for my own childhood when we took family vacations to Florida with my dad's job. This time I'm going with my husband for a conference. Life has come full circle- now I am the parent escorting my own sweet baby on a trip with the family.

We'll spend several days basking in the sun and enjoying the resort where the conference is held. I can't wait.