2017-04-10 09:14
Oxidative stress is the major pillar of the theory of aging. As a joke, I often say in my classes that we get old because we have the bad habit of spending our whole life breathing oxygen. B… Read More
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World Of Biochemistry (blog About Biochemistry) Blog
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reactive oxygen species
oxidative stress
iron ion
insulin
stress
blood
superoxide anion
myoglobin
oxidative
polypeptide chain
This blog intends to display concepts, informations, musics, videos, games, cartoons, curiosities about biochemical issues. Because Biochemistry does not have to be incomprehensible...
2017-04-04 06:46
2017-03-17 11:47
Myoglobin is a cytoplasmic hemoprotein composed by a single polypeptide chain of 154 amino acids. It is expressed solely in cardiac myocytes and oxidative skeletal muscle fibers. Myoglobin… Read More
2017-03-13 12:54
2017-03-10 11:21
During cellular respiration, electrons are transferred from NADH or FADH2, along 4 protein complexes in the inner mitochondrial membrane, to an O2 molecule (read more about this subject here… Read More
2017-03-02 06:38
2017-02-28 06:22
Insulin is a polypeptide hormone produced, stored and secreted in Beta cells of the islets of Langerhans, in the pancreas (in a histological section it is seen that they occupy the central p… Read More
2017-02-26 06:50
2017-02-21 13:55
Oxidative stress results primarily from an imbalance between molecules potentially dangerous to our cells, the so-called reactive oxygen species, and molecules that protect the oxidative int… Read More
2017-02-17 06:18
2017-02-14 07:11
For higher animals, simple diffusion mechanisms in body fluids are not an efficient way to meet the oxygenation needs of their tissues and cellular material. To the low area/volume ratio of… Read More
2017-02-10 06:31
2017-02-08 06:19
Recently I have made a post about oxidative stress (you can read it here), in which, of course, I gave some prominence to the reactive oxygen species. Well, today I'm going to talk about the… Read More
2017-02-06 06:03
2017-02-02 14:12
Glucagon is derived from the Greek words gluco (glucose) and agon (agonist). It is a single-chain polypeptide with 29 amino acids, produced in the α-cells of the islets of Langerhans… Read More
2017-02-01 05:52
2017-01-30 06:54
Today I decided to make a post on a very important topic, oxidative stress. This subject is often referred to in biochemistry classes (and not only!), but it is not always clear to the speak… Read More
2016-09-19 08:09
2016-09-15 05:19
The glycogenin is a protein whose main function is to be the initiator molecule of glycogen synthesis (glycogenesis), a process that allows the storage of glucose residues in the form of a p… Read More
2016-09-12 05:25
2016-09-08 04:52
2016-09-06 05:53
Enolase is an enzyme, more particularly, an active metalloenzyme. This enzyme belongs to the family of lyases, the hydro-lyases, breaking the carbon-oxygen bonds, and is present in all tissu… Read More
2016-09-01 06:36
2016-08-30 06:15
2016-08-28 15:05
Carbohydrates play a variety of functions in nature. Because of this, they are indispensable elements for living beings. The main functions of carbohydrates are:- Metabolic fuel – vari… Read More
2016-08-25 05:43
2016-08-21 08:49
Cytochromes were first described in 1884 by MacMunn as respiratory pigments. Later, in 1920, Keilin rediscovered these respiratory pigments and gave them the name of Cytochrome, classifying… Read More
2016-08-17 07:34
2016-08-15 05:47
Carbohydrates, also referred to as sugars, are a class of biomolecules characterized by the presence of many polar groups in its composition. The building block of the carbohydrates are the… Read More
2016-08-12 05:52
2016-08-11 07:00
Catalase, or hydroperoxidase, is an intracellular enzyme found in most organisms. This protein is found in the peroxisomes, glyoxisomes (plant peroxisome) and in the cytoplasm of prokaryotes… Read More
2016-08-06 06:19
2016-07-29 05:25
In addition to being used as building blocks for protein synthesis, amino acids play many other important physiological functions. One is undoubtedly the fact that there are several amino ac… Read More
2016-07-27 05:15
2016-07-26 06:37
Albumin is a globular protein consisting only of amino acids. It is soluble in water, sparingly soluble in concentrated salt solutions and undergoes denaturation when exposed to excessive he… Read More
2016-07-26 06:32
2016-07-24 20:18
Amino acids are, as mentioned in other posts, molecules that have an amino group and a carboxylic group. These two groups are ionizable, ie, they may undergo protonation/deprotonation. Moreo… Read More
2016-07-22 12:53
2016-07-21 06:02
Vasopressin (væsoʊprɛsən / vaso + -in + pressure), also known as antidiuretic hormone (ADH) has a molecular weight of 1228 kDa and is formed by the following sequence of… Read More
2016-07-20 05:19
Thank you for the suggestion Vasco! :) Read More
2016-07-18 05:37
Amino acids are molecules that, from a chemical standpoint, are characterized by the presence of an amine group and a carboxylic group (acid), and hence its name: amino acid. Its main functi… Read More
2016-07-16 05:15
Thank you for the suggestion Vasco! :) Read More
2016-07-15 11:28
This is the latest group of standard amino group that I will describe. It consists of 2 amino acids, glutamate (also called glutamic acid) and aspartate (also called aspartic acid). Both hav… Read More
2016-02-14 08:08
This class of amino acids includes those amino acids who have in their side chain an alkaline functional group. This means that these amino acids tend to have positive charge on their side c… Read More
2016-02-08 06:35
2016-02-02 07:26
This class of amino acids includes those that do not have ionizable functional groups on its side chain. In fact, despite the definition of this class is given in this way, it is not 100% co… Read More
2015-09-25 05:04
Thank you for the suggestion Vasco! :) Read More
2015-09-13 07:02
By definition, a molecule is considered aromatic when in its constitution there is at least one derivative of benzene, ie, a cyclic structure with 6 vertices (all carbon atoms!), and 3 doubl… Read More
2015-09-09 18:25
Thank you for the input Ferraz! :) Read More
2015-08-28 06:34
2015-08-19 08:48
As I mentioned here on the blog, in an earlier post (this post), the standard amino acids differ in the chemical composition of their side chains. The 20 standard amino acids can be divided… Read More
2015-08-09 05:10
2015-07-27 05:48
2015-07-20 05:08
Thank you for the suggestion, Rui! :) Read More
2015-07-05 05:49
As mentioned in one of my last posts, cytochrome c is a small protein, essential for mitochondrial respiratory chain, where it acts as an electron carrier between the complex III and complex… Read More
2015-06-30 05:41
2015-06-27 04:43
2015-06-25 04:59
2015-06-25 04:59
Anyone who knows me, knows that I am an advocate that our genetic (and epigenetic) information has much more influence on what we are than the classic 50% genetic + 50% environment. Any off… Read More
2015-06-24 08:47
2015-06-22 06:15
The cytochrome c is a small protein with 104 amino acids and a mass of about 12 kDa (12.233 kDa in humans). As a consequence of its small size, it is highly conserved among different mammali… Read More
2015-05-23 05:41
Everything is theoretically impossible, until it is done.(Robert A. Heinlein) Read More
2015-05-19 05:09
2015-05-15 05:37
2006-06-07 11:16
2006-06-07 11:16
2006-06-07 11:16
2006-06-07 11:16
Download the animation here Read More
2006-06-07 11:16
2006-06-07 11:16
Thanks for the suggestion Vasco! :) Read More
2006-06-07 11:16
Thank you for the cartoon Pedro! :) Read More
2006-06-07 11:16
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