Showing posts with label Chemistry. Show all posts
Showing posts with label Chemistry. Show all posts

Friday, 27 March 2015

Scientists solve the mystery of origin of cells!?

Chemists have experimentally demonstrated just how the building blocks of life ingredients can be created in just a chemical reaction using two ingredients and sunlight.

At its core cell consists of three subsystems: the system for creating sections, which with the help of the lipid content is kept in one place, the metabolic system with catalysts and enzymes and system for copying DNA and RNA.

DNA molecule contains the instructions for making proteins, one of the most important parts of all living organisms. However, the cells may not be copied without a pre-existing DNA and proteins can not be synthesized lipids without enzymes that are based on the proteins.

Problem reminiscent of the story of what is older - the chicken or the egg, now may be solved thanks to the effort of experts.


One of the biggest issues in the study of the origins of life is did the mentioned subsystems formed together and at once or one after the other. A team of Cambridge who runs John Sutherland found it to be a precursor of DNA, RNA, amino acids and lipids can be created from hydrogen cyanide or hydrocyanic acid.

All subsystems could be created spontaneously through chemical reactions driven by the
influence of ultraviolet light. The only thing missing is hydrogen sulfide actually to donate its electron so that it is possible that some minerals containing metals as catalysts part of the process, experts say.  

- The young Earth was a perfect place for such a reactionhydrogen cyanide and hydrogen sulfide in this period were plentiful, as were in meteorites and comets, that bombed our planet in the first few hundred million years - said Sutherland.

It is possible that when these processes were changes that created amino acids and lipids, but in other places.

- It is quite likely that these ingredients separately created "met" after rains united them in the same place - concluded Sutherland.
 

Wednesday, 3 December 2014

Fractional Distillation Of Air

Did you know that the air we breathe isn’t just oxygen, infact it’s made up of a number of different gases such as nitrogen, oxygen, carbon dioxide, argon, neon and many others. Each of these gases carry useful properties so separating them from the air around us is extremely beneficial.

The process is called fractional distillation and consists of two steps, the first relies on cooling the air to a very low temperature (i.e. converting it into a liquid), the second involves heating it up thus allowing each gas within the mixture to evaporate at its own boiling point. The key to success here is that every element within air has its own unique boiling temperature. As long as we know these boiling temperatures we know when to collect each gas.

So what are the real world benefits of separating and extracting these gases? Well liquid oxygen is used to power rockets, oxygen gas is used in breathing apparatus, nitrogen is used to make fertilizers, the nitric acid component of nitrogen is used in explosives.

The other gases all have their own uses too, for example argon is used to fill up the empty space in most light bulbs (thanks to its unreactive nature). Carbon dioxide is used in fire extinguishers and is great for putting out fires in burning liquids and electrical fires. There really are too many uses to list but suffice it to say that fractional distillation is an extremely useful process for humans the world over.

Tuesday, 2 October 2012

The Japanese get the 113th chemical element

Japan's RIKEN research center in which a group of scientists got the first time in practice 113th chemical element of the periodic table of Mendeleev. 40-ies of the creation 113th Soviet physicists said element-atomists, but away from the theory did not work. The next year the Americans discovered chemical elements (from 93 to 104), Soviets (104 - 106), the Germans (107 - 112).