Category Archives: that’s weird

How I stumbled upon selfies back in 2004

Sometimes social culture changes and something becomes acceptable so¬†rapidly that it’s just remarkable. I experienced at least one such event in 2004.

In early 2004, I arrived in the US to begin postdoctoral studies. At that time, I still believed that hard work was necessary and sufficient for success. So I was basically busy working in the lab. I never really developed good social skills, so standard postdoctoral work life in US was “ideal” for me. In our lab, postdocs worked alone on individual projects and we did not have much of a “party” culture.

But there was one problem. I wanted to send my photos to my family back in Georgia, showing my “life” at the workplace or at home. But how could I do it? I did have a cell phone with a silly no-resolution camera and another ordinary 1.2 mega pixel photo camera. But who was going to take my photos? I felt so “embarrassed” to take my own photos since it would have implied that I was alone and that I did not feel comfortable to ask anyone around me to take my photos for me. Basically, the concept of “selfie” was an anti-social concept for me then (and also probably for majority of people in Georgia).

But I needed photos. So, I set my camera to a 10 second timer option and started to make my selfies and sending them to my family via e-mails and hoped that no one on the other side would ask me why I was alone in all these photos. And gratefully no one did. I guess my family was “kind” enough not to make me feel “low”.

However, within a few years the selfie concept became so mainstream that no one would now question a photo where someone is pictured alone. It’s become a norm. Ultimately whether it’s good or not, I am not sure. It does give a person some “freedom” on certain occasions and sometimes I feel “proud” that I inadvertently became a”selfie pioneer” back in 2004 ūüôā

posted by David Usharauli

A tweet with valid URL does not show up under the Hashtag feed? Here is one solution

I recently joined Twitter. I thought I can use twitter to expand the audience and widen the exposure for my blog posts. I was totally unprepared to discover that any time I twitted about my newly published posts with the url link in it, twitter would not return it in search.

Initially I thought I was doing something wrong since I was a total newbie to twitter. Strangely, when I twitted anything without url links in it, I could easily found them in search (both in my home page and in public twitter search), but if the same tweet had url of any my blog posts added to it, it would appear only in my twitter home page and never be found in twitter search.

Now this made no sense at all. if not sharing tweets with link added to them, how else one can promote their blog posts or anything? As a new member of twitter community, obviously one does not have much of following. So how that can be true and what can be done about it?

This was my question. I wanted to find the solution to this ridiculous situation. In Google I found several discussions where people complained about the exact situation. One practical suggestion I found was to make tweets “not protected” in twitter setting so to allow tweets to be found in search and not just visible to your followers.

However, even with this modification, tweets with my blog post’s url added to them would not go into twitter search.

Again, I started to read more. I found that people who have reported the same issues, have done experiments and found that tweets without url would go into twitter search but the same exact tweets with url would not. More specifically, however, it turned out that tweets with the urls associated with big name websites would go into twitter search easily but when the same exact tweet was accompanied with one’s own blog post’s url or with not so well-known website urls, then it would not be found in twitter search.

Basically, when you are new to twitter and does not have much followers (obviously), your tweets would not be visible to anyone if you add url links not deemed to be authoritative links or prestigious enough for twitter to index it.

So, you can tweet anything you want as long as you add big name urls to your tweets, basically promoting others work. But who would like such restriction?

Here is what I did instead. I started adding well-known webpage urls¬†to my tweets where I wanted to promote my blog post’s links. I called these urls¬†CARRIER or Booster¬†urls since they have no other function besides to be a “face control” for Twitter indexing algorithm. And surely, all my tweets with my links +¬†CARRIER or Booster¬†urls started to show up in twitter search.

Here is the example:

NOT found in Twitter search

New study suggests activity determines cell death. Review here

FOUND in Twitter search

New study suggests activity determines cell death. Review here


Since I writing mostly about science, I am using homepage url as a CARRIER or Booster url for blog post url. Remarkably, even homepage urls for journal Science or journal Cell was not good enough for Twitter to index my tweets. for some reason only nature’s homepage url worked as CARRIER out of these three urls tested.

Of course, with this method, up to 35 characters are lost for CARRIER or Booster urls, but it is worthy. In the end, at some point in the near future, I expect my twitter account to become more prestigious for Twitter indexing system and would allow tweeting with my blog post’s url alone.

Added on Feb 1, 2015: I found that if I attach photo to my tweet then tweets with my blog post’s url will be indexed in twitter’s public search without need of CARRIER urls.

posted by David Usharauli

Serendipity in Science: Personal Observation

For a scientist reading review articles about his/her research topics is a quite boring task, since review articles usually contain summaries of what are already known. The reviews have no real scientific purpose except as a source of citations and cool looking figures.

There is one reason I found review articles to be very useful to read. Frequently, the authors of the review puts in the review unpublished data or discusses the results of experiment as an “unpublished observation” or a “personal communication”. These are data not available elsewhere. These can be so-called “negative data” that current publishing policies do not favor, though I think there is no such thing as negative data in science, if experiments were done correctly, of course.

Many times negative data can be a foundation for the scientific breakthrough. Here is one example from my personal experience.

Few years ago, I was working on one project related to in vitro Foxp3 induction in naive mouse T cells. At that time, Foxp3+ T cells were very popular. Almost every second paper in immunology was somehow related to Foxp3+ T regs. For me, the interest in Tregs has to do with the fact that current theoretical frameworks on how immune system operates can not tolerate the presence of negative regulatory populations. It is a strange idea but true. Neither self-nonself nor PAMP/DAMP based immune system requires Tregs to operate, theoretically speaking, of course.

My boss then, Polly, had an idea that Tregs are T cell subset driving different type (or class) of immune response rather that inhibiting anything. Since scientists did not measure all type of responses, they saw a down-regulation of a particular known immune type response as an evidence of inhibition rather than considering that system was shifted to unknown type (cytokine) not measured in the assay (for example, IgA or IL-???).

Unlike many laboratories working on Foxp3 induction using anti-CD3/anti-CD28 antibodies, I decided to use more physiological approach of Foxp3+ T cell induction using peptide pulsed DCs and naive peptide-specific CD4 T cells. Experiments went as expected that we were able to generate peptide-specific Foxp3+ CD4 T cells. During this same time period, new T cell subset, called Th17, has been discovered and characterized. It turned out that while Foxp3 induction required TGF-beta, one could generate Th17 simply by adding IL-6 in addition to TGF-beta (TGF-beta + IL-6). It was already shown by then that presence of IL-6 drove Th17 induction and while inhibiting Foxp3+ induction.

Since I was doing an assay with Foxp3+ T cells, I have decided, for no apparent reason, to add IL-6 in my assay. I was expected to see a decrease in Foxp3 expression and increase IL-17. Strangely, when I added IL-6 to Foxp3 induction milieu (TGF-beta, peptide, DCs, CD4 T cells) I noticed that percentage of Foxp3+ T cells went up rather than go down. Th17 induction was expected. I repeated this assay multiple times and over and over I saw that IL-6 was promoting rather than inhibiting Foxp3 induction in my hands.

Now, these results went completely opposite to what everyone else were reporting in the literature. I asked my fellow postdoc to repeat the same experiments to make sure that I was not doing something strange with my culture. Again, we saw the same: IL-6 promoted Foxp3+ T cell induction.

Using IL-4 or IFN-gamma KO mice on the same background, we observed that IL-6 effect on Foxp3 induction was abolished on IFN-gamma KO but not on IL-4KO background. Indeed, using anti-IFN-gamma antibodies with wild-type CD4 T cell assay confirmed that when IFN-gamma was blocked IL-6 lost its ability to increase Foxp3 expression. Parallel experiments showed that exogenous IFN-gamma inhibited Foxp3 expression and that IL-6 inhibited IFN-gamma expression, as expected from published literature.

In the end, after 5 months of continues work, we come up of new hypothesis that could explain our observation. Our finding suggested that IL-6 promoted Foxp3 expression by suppressing IFN-gamma expression in activated peptide-specific CD4 T cells. We reasoned that other laboratories failed to see the same effect since they were using anti-CD3/anti-CD28 activation mode rather more physiological, peptide activation mode. Indeed, in our hand too, IL-6 inhibited Foxp3 expression when anti-CD3/anti-CD28 antibodies were used to activate CD4 T cells.

So, we were very confident that we found something worthy of publication in one of prestigious journals.

Then, suddenly, we started to receive reports that mice from our mouse colony started to die in higher numbers than normally observed. People had no clue what was going on. In the end, after thorough investigation that took few months, it was revealed that new type, not yet described Streptococcus was causing mice death (one of clinical signs was a cardiomyopathy). The mouse colony was shut down, newly re-derived and repopulated.

As you may have already suspected, when we repeated our experiments with IL-6 on T cells from “clean” mice, we saw that now IL-6 was inhibiting Foxp3 expression rather than promoting it and this effect was seen both times when peptide or anti-CD3/anti-CD28 were used.

These are the type of experiences that make someone like me to appreciate why we do science. As to new Streptococcus we discovered, I did not have a chance to study it but I hope someone will be doing his/her PhD by studying this unusual bacteria and its unusual effects on immune system.

posted by David Usharauli