Cesar

30 comments By Cesar

  • Call me a simple electrochemist, but if a molecule is oxidized (or reduced) something has to be reduced (or oxidized). In pure water which is the actual reductan or oxidant¿. The reference to enzymes is disingeneous. The problem is not kinetics but thermodynamics.

  • The plain answer is NO. Not only reactions is not what chemistry is all about but it would be very surprising of a researcher in organic chemistry to know that he is just finding new examples of known reactions (quite unpublishable). The concept reminds me of Michelson comment (wrongly attributed to Lord Kelvin) that all physics was done in 1900.

    Commented on: 2019-03-08T23:51:49.400

    A picture of a measuring cylinder

    Have we solved chemistry?

  • The IARC has been completely discredited as evaluation body due to conflict of interests, ideological bias and pure ignorance. If CW believe in them, they should stop eating meat or drinking hot beverages!!!

    Commented on: 2018-12-24T12:45:39.667

    Close up image of hair dye being applied to blonde hair

    Dye hard with a valence

  • I think the biased comments on other countries political developments have no place in Chemistry World. First, the police today obeys a president of PDMB which is center left, far from Bolsonaro's. Second it is possible for the Ministry of Science to be eliminated which will leave Brazil in the same situation than UK or USA. Next, according to poolers 79% of Bolsonaro's voters were more educated citizens from the richer south while 89% of the opposition votes come from poor, less educated North. Why is that? Because they reject highly corrupt left and center left politicians.

  • As a researcher from an emerging country, I think the main responsability if reviewer fatigue resides with editors. On one side the silly rejection by the editor, without ground has become increasingly common. However, I made more than my share of reviews (e.g. 48 reviews in 3 years for a 4.5 impact factor journal) without any reward. For example the editor could award open acesss after a number of reviews. Or do not evaluate papers of authors which reject more than a number of reviews. I also find out that I only receive for review papers from emerging countries. No papers from Europe or Usa. Strange because during my postdoc in Switzertland I receive papers from usa and europe.

  • Interesting. Where and when such strategy worked out?

    Commented on: 2018-07-08T17:24:41.157

    UK flag made up of scientific conical flasks, illustration

    Shaking up the knowledge economy

  • If the source of the funding is relevant to the outcome, the conclusions are untrue. Then, how we are protected from ideological bias? And what about state funding, the major player on most countries? All papers calling for more regulations or in any way increase the role of the state are suspected?

    Commented on: 2018-07-02T18:56:34.637

    Talcum powder

    J&J and the question of shadow research

  • Right. If John Holdren is the best you can get as science adviser, potus can do without. A plasma physicist who "advise" on population, climate change, etc. having no degree or evidence on the subject. Absurd predictions and policies like dosing drinking water with anticonceptives.

  • Quite strange reading of "the selfish gene". I do not know anybody who understand Dawkins model as some kind of sci fi replication game. Most understand it as a mechanism of evolution with influence on family, survival, group behaviour, etc. It is obvious in the book that the whole orgánism is required.

    Commented on: 2018-02-13T01:26:23.163

    DNA strand flipped

    Revisiting Richard Dawkins' idea of replication

  • Nice work but somewhat strange. The key question in Haber process is temperature not pressure since the reaction is reversible and exothermic. Increasing temperature decrease the equilibrium reaction. The catalyst described here works at 400 oC which is around the temperature of the commercial process. Therefore the equilibrium constant should be similar. Pressure is used to shift the equilibrium to ammonia. At low pressure the yield would be negligible. Am I wrong?

  • CW still fail in carbohydrate science. Fructose is a natural sugar present in pommegranate (the original source of grenadine) while high fructose corn syrup is a cheap conction made by enzymatic isomerization of glucose, obtained from corn starch (not just hydrolysis). HFC is the villain of obesity epidemy in the world not fructose.

    Commented on: 2018-01-08T23:17:42.793

    Grenadine-based drinks

    Fructose

  • Trehalose is used as food additive as cryopreservant because it is less sweet than sucrose at low concentrations. Since it has always been present, the linkage to mutant epidemic could be a statistical serendipity (remember glyphosate and autism) since it is widely used in microorganism growth, to allow lyophylization, without reported contamination with mutant bacteria. As a RSC member I expect Chemistry World to correct the errors in the note...

    Commented on: 2018-01-04T23:20:09.583

    Trehalose (mycose, tremalose) sugar molecule. Atoms are represented as spheres with conventional color coding: hydrogen (white), carbon (grey), oxygen (red)

    Food additive may have given deadly bacterium its chance

  • It would be advisable that Chemistry World hire some scientists to write notes instead of "science journalists" that obvioulsy do not know chemistry. Trehalose does not give Maillard reaction because it has a 1,1' glucosydic bond. The same bond(but with different sugars) than sucrose, which also do not give Maillard. Trehalose is a natural compound, in fact is extracted from starch, therefore it has always been present.

    Commented on: 2018-01-04T23:13:57.310

    Trehalose (mycose, tremalose) sugar molecule. Atoms are represented as spheres with conventional color coding: hydrogen (white), carbon (grey), oxygen (red)

    Food additive may have given deadly bacterium its chance

  • The IPCC whom I suppose is an authority in climate change, clearly stated that extreme events are NOT affected by climate change. Therefore the article is just garbage....

    Commented on: 2017-10-30T23:49:51.693

    American flag material

    White House urged to consider climate change consequences

  • In fact, the famous Erin Brockovich was a typical ambulance chaser and real science shows that Hinckley had less cancer cases than similar cities and chromium VI in water (unlike as airborne particles) has been proved not carcinogenic, at least because it is unlikely to survive in presence of organic substances. It is a pity that Chemistry World did not check the science insidd the articles.

    Commented on: 2017-10-13T03:44:00.270

    Preparing a solution from the salt of sodium dichromate

    Sodium dichromate

  • If the situation is actually as described in the note, the retraction of the papers is not enough. The principal author fake the address and wrote the fake review to mislead the journals. Why we should believe in the data if he fakes the documents? He should be banned from publishing for some time (at least 3 years) and then be subjected to special scrutiny. Otherwise he learns nothing, as it can be seen from his comments, and he will do that again until is caught.

    Commented on: 2017-08-30T21:34:22.227

    Retracted rubber stamp

    Fake peer review hits RSC journals

  • Quite strange proposition. First it acknowledged that Exxon scientists do science even against the interest of the company. Therefore, all the crazy business about disclosing the minimal funding from industry as a conflict of interest should be over. Moreover, government paid scientist routinely make opinion pieces on politics claiming a greater government role. It is not a conflict of interest? The public opinion of the company is obviously related to its interests and not the "general" interest and nobody ever think otherwise.

    Commented on: 2017-08-30T12:44:46.317

    Activists in New York supporting Schneiderman's investigation of ExxonMobil

    New claims that Exxon misled on climate change

  • Nice article, very good in historical data. Unfortunately, the chemistry is weak. The role of chloride ions is not to "make room for more gold ions" but to change the potential of the redox reaction. The electrode potential of nitric acid reduction is 0.96 while the oxidation of gold to Au+3 is 1.52, therefore it is not spontaneous. On the other hand, the oxidation to Au(Cl-)4 has a potential of only 0.93 V, because the equilibrium shifts the potential. Therefore, the dissolution of gold in aqua regia is spontaneous (note that high Cl- concentration increaes the cell voltage).

    Commented on: 2017-07-15T21:51:15.143

    Gold crown with gemstones

    Aqua regia

  • Nice to remember Weizmann early contributtion to biotechnology. The process has now been revisited since it could produce biofuels from biomass. However, the author mixed up the older pyrolitic process to obtain acetone. Pyrolysis of wood gives some methanol and acetone. On the other hand, dry distillation of calcium acetate (which can be made from vinegar) gives acetone with good yields.

    Commented on: 2017-07-08T02:45:52.137

    0717CW - Last Retort - Index

    The Weizmann contribution

  • Missing in the article is to know if we could believe in a regulation system where one country allow 5% and another 0,3 %. Or USA is allowing his people to be poisoned or the EU is too harsh and damaging the economy and the consumer freedom. Knowing the position of the UE in GMOs I will believe is the later.

    Commented on: 2017-06-01T00:06:41.827

    An image of two men clinking whiskey glasses

    Propylene glycol