Category Archives: DNA

Almost every power producer knows that power tariffs need to be revised upwards. One reason is the surging costs of inputs especially of coal and gas. A second reason is that industry has begun to find solar power cheaper than the price they pay for industrial and commercial power, and thus could reduce their offtake from the grid. That would leave state governments with less money to subsidise cheap power for agriculture and below the poverty line (BPL) families. A third reason is unpaid bills both by consumers and by state distribution companies, threatening to adversely affect power producers. Then there is the problem of losses and theft.

Something needs to be done. Increasing tariffs is one short term solution.

To discuss this, DNA called together a panel comprising (in alphabetical order) G. J. Deshpande, Regional Executive Director, Western Region-I Headquarters, National Thermal Power Corporation; O. P. Gupta, General Manager, BEST [Brihanmumbai Electric Supply and Transport Undertaking]; Ajoy Mehta, Managing Director, Maharashtra State Electricity Distribution Company; S. Padmanabhan, Executive Director, Operations, Tata Power;

Moderated by DNA's R.N.Bhaskar with editorial support from Karishma Goenka, the panel discussed the options that lie ahead.

Given below are edited excerpts:

Padmanabhan: The need for tariff increase is there across the country. Almost all the state distribution companies have accumulated regulatory assets, and there is a definite need. There are many reasons why we are at this stage.

One is there has not been a steady, annual, regular increases in tariff across all the states. Second, there has been an acute fluctuation in fuel prices in the last two- three years, which was never seen before, both in oil and coal prices.

DNA: And now gas.

Padmanabhan: And now gas.

Original post:
dna Conversations: Power tariffs need revision

Imagine prowlers broke into your company warehouse over the weekend. The alarm sounded, but the devious blaggards got away with the goods before the police arrived. Your security cameras caught only dim, shadowy images of the intruders, not clearly enough for positive identification. DNA tagging could change that.

Normally, tracking a criminal using DNA requires, at a minimum, that the perpetrator leaves behind a DNA sample in some form or other. As they are not often so accommodating, the role of DNA in crime busting, while significant, has its limits.

Applied DNA Sciences (ADNAS) has developed a new approach to solve crimes using DNA tagging. The difference is that instead of tagging the objects being stolen, they tag the pilferer with DNA. While this has been tried before by applying the DNA to a fleeing criminal with a gun, ADNAS has adopted a more subtle approach.

For years banks have rigged bags of money with exploding dye packs, which mark the outlaw and the stash. The ADNAS system takes advantage of that basic concept, but implements it differently, so that a thief can be tagged without having a clue that their career will be cut short.

DNA Fog is an airborne suspension of artificial DNA molecules with a known but biologically inert sequence. The DNA molecules (Applied DNA's SigNature DNA) are artificially constructed, so that a strand of DNA with 20 base pairs can have over a trillion unique combinations. A security system could use one sequence per location, one sequence for each area within the location, or even use RFID tags to instruct a sophisticated spraying device to spray a unique DNA signature for each item stolen.

Once released, DNA molecules attach onto a malefactor's clothing, shoes, hair, and skin, as well as the objects stolen. This is rather like putting exploding dye packs in bags of money, save that the perpetrator has no idea that he has been marked.

It is surprisingly hard to scrub all the DNA off of one's body, clothing, shoes and tools. Regardless of what conventional cleaning methods a thief chooses, they will be easily detected to have been at the scene of the crime at the time it was committed for a period of at least two weeks, and potentially for years.

Should a guilty suspect be arrested, police would swab them and their clothes (and probably their apartment and car), then read the DNA samples using the polymerase chain reaction, which amplifies the genetic material from the sample to the point that it can be identified. The video below illustrates this reaction.

Amplifying makes the DNA samples easier to detect and analyze, and the overall process is simple and cheap enough that it can be done by non-specialists.

Can DNA Fog be defeated? There are couple of possibilities here. The low-tech approach is to wear an overall Tyvek suit with a diving mask. A higher-tech method is to swamp the DNA Fog system, perhaps by bathing with a body shampoo that contains millions of false DNA fragments. This would make it difficult for investigators to find the right sequence. It becomes a needle in a haystack problem, except the needle is also made of hay.

Read this article:
DNA Fog helps identify trespassers, thieves, and brigands

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