Author Archives: negin khosravi

Antibiotic Treatment Course…to finish or not to finish?!

Have you ever taken antibiotics for any infections? I’m sure most of you have… have you been told to finish the course of treatment even after you feel better? This has been the traditional approach to antibiotic treatment for many years. The common belief is that, not completing the course of treatment would cause the bacteria to mutate and become resistant to the antibiotic. This belief was questioned by a study published in 2017 claiming that there is little to no evidence supporting the idea that not completing a prescribed antibiotic course results in antibiotic resistance; while many studies suggest that taking antibiotics more than necessary increases the chance of antibiotic resistance.

The common belief is that failure to complete the course of antibiotic treatment can result in antibiotic resistance. A new study has questioned this belief. Image from Pixabay

The study by Martin Llewelyn, a professor in infectious diseases at Brighton and Sussex medical school, and colleagues published in the British Medical Journal became controversial as it claimed that this idea has arisen from the “fear of undertreatment” in the early years of antibiotic discovery. The article suggested that “[policy makers, educators, and doctors] should publicly and actively state that this was not evidence-based and is incorrect.” Many experts agreed with these findings. Alison Holmes, a professor of infectious diseases at Imperial College London, in agreement with this article mentioned that a great British authority, Professor Harold Lambert had made the same point in an article in 1999. This article states that since the optimum duration of antibiotic treatment for infections are unknown, patients should stop taking antibiotics when they feel better to avoid antibiotic resistance.

Martin Llewelyn and colleagues claim that there is no evidence for completing the course of antibiotic treatment and patients should stop taking antibiotics once they feel better. Image from Pixabay

On the other hand, many disagree with this claim. Sumanth Gandra, a physician, claims that although it is true that an antibiotic treatment course should be reduced to minimum, the only way to minimize antibiotic use responsibly, is by clinical trials to assess the optimal treatment lengths for different infections. Moreover, patients should not stop their antibiotics without consult with their physicians. The US Food and Drug Administration (FDA) and World Health Organization (WHO) still strongly encourage the public to follow the instructions of their physician and finish the course of antibiotic treatment.

Health organizations strongly encourage the public to follow the instructions of their physicians and finish the course of antibiotic treatment. Image from Shutterstock

Antibiotic resistance is an important topic in today’s society and there are several different opinions about the causes of antibiotic resistance. Despite these disagreements, I think it is our responsibility as the educated public to follow the instructions and suggestions of authorities and experts in institutions such as WHO and advise others to do so.

Women in Science: From Minority to Nobel Prize

Earlier in October, Nobel Prize Committee announced the list of 2018 winners in all categories, including two women in the fields of chemistry and physics. Do you find this surprising? Well… it is… this is the first time in the history of the award that two women are among the winners of these two categories in the same year.

2018 is the first year in the history of Nobel Prize that two women are among the winners in chemistry and physics. Image from: Shutterstock

Since 1901 when the first Nobel Prizes in chemistry and physics were awarded, 177 people have had the honours to receive the most prestigious award in chemistry. Frances. H Arnold is only the fifth woman. Even more surprising, Donna Strickland is only the third woman out of a total of 207 Nobel Prize winners in physics.

As shown the graph below, we can easily see this trend in all science-related categories of the Nobel Prize.

Does this tell us something about the number of women in of science in general? Or maybe at least the number of women in science who have been successful enough to receive a Nobel Prize?

Relative percentages of men and women winners of Nobel Prize in Chemistry, Physics, Physiology and Medicine, and Economics. Data from: areppim

I think this trend can be explained by the fact that in the 20thcentury women in general have been the minority in all fields of science. Just take a look at the old photos of the faculty members and graduates of chemistry and physics departments hanging from the walls of chemistry and physics buildings at UBC! Women are in absolute minority! I know… this may not be the most precise and scientific evidence, but it gives us a better idea of the men and women active in these fields back then. So, it is understandable that when there were not as many women graduates in these fields in the 70’s and 80’s, there would not be a high number of women prize winners now.

But again, using my scientific method of looking at more recent photos of chemistry and physics faculty members and graduates, I am glad to say that the trend has been changing. Nowadays, we see more women active in all areas of science pursuing their dreams.

Strong successful women such as Dr. Arnold and Dr. Strickland are good motivations for all women in science. Dr. Arnold who is a professor of chemical engineering, bioengineering and biochemistry at the California Institute of technology in a news conference at Caltech predicted that “a steady stream” of future Nobel prizes in chemistry would be given to women. She also added “as long as we encourage everyone — it doesn’t matter the color, gender; everyone who wants to do science, we encourage them to do it — we are going to see Nobel Prizes coming from all these different groups. Women will be very successful.”

Automated Chemical Synthesis Machine: Reaction Optimization Has Never Been Easier!

Researchers in Massachusetts Institute of technology have developed an automated machine that can perform several chemical reactions in a short time to determine the most efficient route for synthesizing complex organic molecules such as various drugs and artificially synthesized natural products such as proteins and vitamins.

Researchers in the field of organic synthesis, spend weeks or months trying to come up with a synthetic route for a new complex organic molecule such as a new drug. These routes often are not efficient, so they spend even more time, trying to optimize the route so that the target molecule can be synthesized with high yields in large scales in industry. This new system can test and optimize a new synthetic route in about a day.

Synthesis of useful but complex organic molecules is a time-consuming process. Image from Pixabay

According to Timothy F. Jamison, head of MIT’s Department of Chemistry, in an interview with MIT News“our goal was to create an easy to use system that would allow scientist to come up with the best conditions for making their molecules of interest”. This would allow chemists to have more time to come up with new ideas that can be easily and efficiently tested.

This machine uses a continuous flow systemco-designed by Jamison a few years ago. In this system, chemical reagents flow through a series of tubes and at different points, new chemicals are added to the reaction. So, the machine performs a multi-step synthetic process continuously without the need to manually transfer the products of a reaction to be used as the starting materials of the next reaction.

So, the chemist comes up with a new synthetic route for a desired molecule and programs the machine with the reaction conditions. Then the machine uses an optimization program to explore different conditions and determines the reaction conditions that result in the highest yield.

This new system can test and improve a synthetic route for a complex organic molecule like a pharmaceutical in a day. Image from shutterstock

In my opinion, innovations like this can easily and rapidly improve synthetic organic chemistry so many useful natural organic molecules can be efficiently synthetized in industry. This means more reasonable prices for many drugs and important supplements.

The researchers have patented this new technology and published the results of the research as a journal article in Science.