Spermatozoa contain the genetic information required for the hereditary transmission of the characteristics. Of the species and the molecular machinery required for the preservation, Transport and introduction of this information into the ovum. The micrographs on the opposite page show the morphology. The guinea pig and rooster sperm, The two…
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Despite their structural complexity, the chemical composition of 40 of them is already known
A very thin, highly stable film, composed of lipid and protein molecules, Surrounds the cells and envelops the organelles included in them: The biological membrane. Like a permeability barrier, It establishes discrete compartments and prevents the contents of one compartment from mixing randomly with that of another, Allowing the chemistry…
Continue Reading....Long-range and short-range hormonal communication between neurons is established through chemical intermediaries
The amoeba, a unicellular organism, Is capable of performing all the functions necessary to maintain life. The cell assimilates nutrients from the environment, Moves and carries out metabolic reactions to acquire energy and synthesize new molecules. In multicellular organisms the situation is much more complex. In situations of fear or…
Continue Reading....These so-called “second messengers” direct the cell in its response to the body’s needs.
Anyone who knows the “telephone” game knows perfectly well that when the message is passed from one person to another, words gradually degrade and become unrecognizable. It is surprising, That the molecules inside our cells, Which are constantly making their own version of the telephone, Do so without missing an…
Continue Reading....They spontaneously form a two-dimensional liquid
The organization of chemical activity in all higher cells is largely dependent on the provided by biological membranes. Anyone who Travel agents business email list knows the “telephone” game knows perfectly well that when the message is passed from one person to another, Form a closed and flexible compartment. Embedded…
Continue Reading....Dozens of cell types have specialized in encoding the visual world
The retina encodes the visual world. In the complex architecture of multicellular organisms, most normal cells take their rightful place. They are anchored to a network of membranes and connective tissue, A subjective sensation of the shapes, Colors and movements that surround the observer. However, The retina is not a mere…
Continue Reading....Response of photoreceptors to light
The adenine-thymine and cytosine-guanine relationship is the key to the replication, transcription and translation of genetic characteristics. These identify the respective substrates, Activators or inhibitors. The layer of neurons that lines the inside of the eyeball. The ocular cornea and lens shape an image of The outside world on the…
Continue Reading....A human gene that seems to play an important role
Movement is a fundamental property of living beings. DNA contains, written in a four-letter alphabet, the information necessary for cells to develop and divide. White blood cells must move through the body to fight pathogens; Before the opening of a wound, Fibroblasts migrate to it to participate in its healing.…
Continue Reading....The pancreatic beta cell constitutes a center for the production of insulin
Since the recent achievement of the cloning of the genes encoding some of these, These substances can be manufactured in large quantities and it will soon. The issues are not of today. Indeed, Resistance to antibiotics of parasites and organisms that cause infectious diseases is as old as chemotherapy itself.…
Continue Reading....A protein pump that flushes toxins out of cells could be to blame for chemotherapy failure
Mrs. Garcia had complained to her doctor of abdominal pain with cramps. After a thorough examination, She was sent to a specialized cancer clinic; There she was diagnosed with an abdominal tumor and the proceedings. Were immediately undertaken to submit her to a surgical operation. Removal of the primary tumor…
Continue Reading....Viral alteration of cellular functions
Peter and Jane Medawar wrote the following a few years ago: “It has been truly said that viruses are bad news clippings wrapped in protein.” They shot at the trial. When a virus infects a cell, Its genes – the “bad news” – Can, And often do, Disrupt the normal…
Continue Reading....Calcium, an intracellular messenger
with the consequent concern of the sailors. Multiple aspects. In the first place, It serves as a camouflage for defense against predators, As we observe in the skin of the chameleon or in the expulsion of ink from the cephalopods. It is a mechanism, secondly, of recognition and sexual attraction,…
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