ACTH analog is one of those subjects where the details matter more than the headlines. This page pulls together the background, the mechanisms, and the practical points readers ask about most.
Updated 2025-12-26. Numbers and descriptions here follow the published literature rather than marketing material.
Reported pharmacological work centers on neurotrophic signaling, including changes in BDNF and NGF expression in hippocampal tissue in animal models. Human data come largely from studies conducted in Russia, and how well those results generalize to other populations remains an open question. Regulatory status differs sharply by jurisdiction: Semax is a registered prescription medicine in Russia, while it holds no approved marketing status in the United States or the European Union. Outside such jurisdictions it is generally handled as a research chemical, which affects both documentation and quality expectations.
Semax is a synthetic heptapeptide whose sequence is Met-Glu-His-Phe-Pro-Gly-Pro. It was developed as a fragment analog of adrenocorticotropic hormone, modeled specifically on the ACTH(4-10) region. The first four residues reproduce that fragment, while a Pro-Gly-Pro tripeptide is appended at the C-terminus. Work on the compound originated in Russia, where it entered clinical use as an intranasal preparation. Its sequence places it among short regulatory peptides studied for effects on the central nervous system rather than on the adrenal axis.
The C-terminal Pro-Gly-Pro extension is not incidental. Proline-rich tails are known to resist several common peptidases, and the published literature attributes the longer half-life of Semax, relative to unmodified ACTH fragments, to this feature. The modification also removes the melanocyte-stimulating and corticosteroidogenic activity that characterizes longer ACTH-derived sequences. Because the molecule is small and hydrophilic, it is typically formulated as an aqueous solution for intranasal or parenteral delivery. Acetylation or amidation at the termini appears in closely related research peptides and shifts the mass by a fixed increment.
Claims about enhanced focus, memory, or mood in healthy people rest mostly on anecdotal reports and community discussion rather than on controlled data. It remains unclear whether any cognitive benefit observed in patients recovering from brain injury would extend to uninjured users. Dose-response relationships, long-term safety, and interactions with other drugs are not well characterized in the peer-reviewed literature. Questions about optimal route of administration and treatment duration likewise remain open.
Semax binds to melanocortin receptors and is thought to influence neuronal survival and plasticity rather than to act through the adrenal axis. Laboratory work has shown increased expression of brain-derived neurotrophic factor and nerve growth factor in treated tissue. Changes in c-Fos, a marker of neuronal activation, have also been reported. Because the peptide is rapidly degraded by peptidases, its effects are generally attributed to downstream signaling cascades rather than to sustained receptor occupancy.
| Property | Value | Notes |
|---|---|---|
| Molecular weight | ~813.9 Da (free heptapeptide) | N-acetylated form is about 42 Da heavier |
| Residue count | 7 (heptapeptide) | Four residues from ACTH(4-10), three added |
| Appearance | White to off-white powder | Usually supplied lyophilized |
| Solubility class | Freely soluble in water | Also dissolves in DMSO and polar organic solvents |
| Related parent fragment | ACTH(4-10) | Parent motif is Met-Glu-His-Phe |
Russian regulatory authorities approved the peptide for nasal administration, and it remains listed in the national pharmacopoeia under several trade names. Documented indications include acute ischemic stroke, transient ischemic attacks, traumatic brain injury, and certain ophthalmological and neurological conditions. Physicians also prescribe it for cognitive complaints in older patients, although the evidence base for that use is thinner. Outside Russia and a few neighboring states, the substance is not an approved medicine and is sold instead as a research chemical.
Later generations of the molecule include an N-acetylated form and an amidated form, both marketed online alongside the parent peptide. These variants differ in terminal chemistry and stability, and they are frequently discussed in the same breath even though they have not been compared in controlled trials. Supply outside formal healthcare systems comes largely from laboratories that synthesize peptides to order. Purity and identity of these materials vary widely, and no single body oversees the international trade.
Semax is a synthetic heptapeptide developed in the Soviet Union during the 1980s by researchers at the Institute of Molecular Genetics in Moscow. It was designed as a truncated analog of adrenocorticotropic hormone, retaining only the fragment spanning residues four through ten. Investigators sought a peptide that would preserve the cognitive effects associated with ACTH while eliminating the hormonal stimulation of the adrenal cortex. The compound entered clinical use in Russia during the following decade.
Verification of a supplied batch generally combines a certificate of analysis with independent testing, because certificates are self-reported documents. A typical package includes a chromatographic trace, a mass spectrum, and a stated water or counter-ion content. Batch-to-batch consistency matters more than a single purity figure when results are compared across experiments. No single mandatory standard governs research-grade peptide release, so laboratories are expected to define their own acceptance criteria. Residual trifluoroacetate from purification is a frequently overlooked counter-ion.
Lyophilized material is chemically stable for extended periods when kept dry, cold, and protected from light. The powder is hygroscopic, so vials should be warmed to room temperature before opening to reduce condensation on the contents. Once dissolved, the peptide is far less stable because peptide bonds are susceptible to hydrolysis and the methionine residue can oxidize. Solutions are typically aliquoted and held at 2-8 °C for short intervals or frozen for longer ones, and repeated freeze-thaw cycles should be avoided.
=== Diagnosis of infections === Clinical features of a respiratory tract infection may include initial symptoms of an upper respiratory tract infection mimicking a viral infection, usually associated with low-grade fevers. This may progress to the lower respiratory tract within a few days, with features often resembling those of wheezy bronchitis. Sputum may be difficult to expectorate and is often grey or creamy in color. The cough may persist for weeks without appropriate treatment. Many cases are diagnosed after presenting chest infections that do not respond to penicillins or first-generation cephalosporins. A chest X-ray can identify alveolar consolidation. Clinical diagnosis of invasive H. influenzae infection (infection that has spread to the bloodstream and internal tissues) is typically confirmed by bacterial culture, latex particle agglutination tests, or polymerase chain reaction tests on clinical samples obtained from an otherwise sterile body site. In this respect, H. influenzae cultured from the nasopharyngeal cavity or throat would not indicate H. influenzae disease, because these sites are colonized in disease-free individuals. Although highly specific, bacterial culture of H. influenzae lacks sensitivity. Use of antibiotics prior to sample collection greatly reduces the isolation rate by killing the bacteria before identification is possible. Recent work has shown that H. influenzae uses a highly specialized spectrum of nutrients where lactate is a preferred carbon source.
== Prevention == Among the recognized risk factors for aortic dissection, hypertension, abnormally high levels of lipids (such as cholesterol) in the blood, and smoking tobacco are considered preventable risk factors. Repair of an enlargement of the ascending aorta from an aortic aneurysm or previously unrecognized and untreated aortic dissections is recommended when greater than 5.5 cm (2.2 in) in size to decrease the risk of dissection. Repair may be recommended when greater than 4.5 cm (1.8 in) in size if the person has one of the several connective-tissue disorders or a family history of a ruptured aorta.
(The "V" stands for "voltage".) An NaV channel has three possible states, known as deactivated, activated, and inactivated. The channel is permeable only to sodium ions when it is in the activated state. When the membrane potential is low, the channel spends most of its time in the deactivated (closed) state. If the membrane potential is raised above a certain level, the channel shows increased probability of transitioning to the activated (open) state. The higher the membrane potential the greater the probability of activation. Once a channel has activated, it will eventually transition to the inactivated (closed) state. It tends then to stay inactivated for some time, but, if the membrane potential becomes low again, the channel will eventually transition back to the deactivated state. During an action potential, most channels of this type go through a cycle deactivated→activated→inactivated→deactivated. This is only the population average behavior, however – an individual channel can in principle make any transition at any time. However, the likelihood of a channel's transitioning from the inactivated state directly to the activated state is very low: A channel in the inactivated state is refractory until it has transitioned back to the deactivated state. The outcome of all this is that the kinetics of the NaV channels are governed by a transition matrix whose rates are voltage-dependent in a complicated way. Since these channels themselves play a major role in determining the voltage, the global dynamics of the system can be quite difficult to work out.
Calvin has suggested that some hand axes could have served as "killer frisbees" meant to be thrown at a herd of animals at a waterhole so as to stun one of them. There are no indications of hafting, and some artifacts are far too large for that. Thus, a thrown hand axe would not usually have penetrated deeply enough to cause very serious injuries. Nevertheless, it could have been an effective weapon for defense against predators. Choppers and scrapers were likely used for skinning and butchering scavenged animals and sharp-ended sticks were often obtained for digging up edible roots. Presumably, early humans used wooden spears as early as 5 million years ago to hunt small animals, much as their relatives, chimpanzees, have been observed to do in Senegal, Africa. Lower Paleolithic humans constructed shelters, such as the possible wood hut at Terra Amata.
Starting in the United Kingdom in the 18th century, the discovery of steam power set off the Industrial Revolution, which saw wide-ranging technological discoveries, particularly in the areas of agriculture, manufacturing, mining, metallurgy, and transport, and the widespread application of the factory system. This was followed a century later by the Second Industrial Revolution, which led to rapid scientific discovery, standardization, and mass production. New technologies were developed, including sewage systems, electricity, light bulbs, electric motors, railroads, automobiles, and airplanes. These technological advances led to significant developments in medicine, chemistry, physics, and engineering. They were accompanied by consequential social change, with the introduction of skyscrapers accompanied by rapid urbanization. Communication improved with the invention of the telegraph, the telephone, the radio, and television. The 20th century brought a host of innovations. In physics, the discovery of nuclear fission in the Atomic Age led to both nuclear weapons and nuclear power. Analog computers were invented and asserted dominance in processing complex data. While the invention of vacuum tubes allowed for digital computing with computers like the ENIAC, their sheer size precluded widespread use until innovations in quantum physics allowed for the invention of the transistor in 1947, which significantly compacted computers and led the digital transition.
Sources: en.wikipedia.org
The Double Qaim-Maqamate of Mount Lebanon (1843–1861) was one of the Ottoman Empire's subdivisions following the abolishment of the Mount Lebanon Emirate. After 1843, there existed an autonomous Mount Lebanon with a Christian and a Druze subdivision, which have been created as a homeland for the Maronite Christians under European diplomatic pressure following the 1841 massacres, and for the Druze segment of the population. After the collapse of the Double Qaim-Maqamate due to the 1860 conflict, the Maronite Catholics and the Druze further developed the idea of an independent Lebanon in the mid-nineteenth century, through the creation of the Mount Lebanon Mutasarrifate. The idea of dividing Mount Lebanon between Christians and Druze was a system proposed by the Austrian Chancellor Metternich between the British and the Ottomans, who backed the Druze demand for a Druze governor, and the French, who insisted on the return of the Shihab principality. Thus, the Druze emir Ahmad Arslan was appointed qāʾim maqām of the mixed southern district and Christian emir Haydar Ahmad Abu al-Lamaʿ qāʾim maqām of the mostly Christian northern district, each qāʾim maqām was to be accompanied by two wakils, a Druze and a Christian, who exercised their judicial and fiscal authority over the members of their respective communities. Emir Haydar Ahmad Abu al-Lamaʿwas a member of Abu'l-Lama clan, which converted to Christianity and joined the Maronite Church at the beginning of the eighteenth century.
It includes an intro song titled "Persona" rapped by group leader RM, who asks, "who am I?", and is confronted with various versions of himself with the words "persona", "shadow", and "ego", referring to Jung's theories. On 21 February 2020, the band released Map of the Soul: 7, which specifically focuses on Jung's "shadow" and "ego" theories. As part of the first phase of the band's comeback, "Interlude: Shadow", rapped by Suga and released on 10 January, addresses the shadows and the darkness that go hand-in-hand with the light and attention shone on celebrities. The next comeback trailer, "Outro: Ego", performed by J-Hope, ends with his declaration of self and ego as he appears within a colourful city "in which the artist's current image is projected". In 2019, Italian rapper Marracash released the album Persona, which features many Jungian themes. Jung appeared on the cover art of the 2008 single "Metanoia" by American psychedelic rock band MGMT. Composer John Zorn released his composition Liber Novus inspired by Jung's Red Book in 2010 on the Tzadik CD Dictée/Liber Novus. English rock musician Peter Gabriel's song The Rhythm of the Heat from his 1982 album, is directly based on Carl Jung's experiences during his time in Africa. The working title for the song was "Jung in Africa". Peruvian musician Daniela Lalita has cited Jung's archetype of the "Great Mother" as a major influence on her works Madre and Trececerotres.
The United States Department of Energy, National Science Foundation, NASA, industry, and nine universities pooled resources to access supercomputers from IBM, combined with cloud computing resources from Hewlett Packard Enterprise, Amazon, Microsoft, and Google, for drug discovery. The COVID-19 High Performance Computing Consortium attempted to forecast disease spread, model vaccines, and screen thousands of chemical compounds. The Consortium had used 437 petaFLOPS of computing power by May 2020. The C3.ai Digital Transformation Institute, an additional consortium of Microsoft, six universities (including MIT), and the National Center for Supercomputer Applications in Illinois, working under the auspices of artificial intelligence software company C3.ai pooled supercomputer resources toward drug discovery, medical protocol development and public health strategy improvement, as well as awarding grants for similar purposes.
=== Permittivity === Graphene's permittivity varies with frequency. Over a range from microwave to millimeter wave frequencies, it is approximately 3.3. This permittivity, combined with its ability to function as both a conductor and as an insulator, theoretically allows compact capacitors made of graphene to store large amounts of electrical energy.
Sources: en.wikipedia.org
== Y-axis: signal intensity == The y-axis of a mass spectrum represents signal intensity of the ions. When using counting detectors the intensity is often measured in counts per second (cps). When using analog detection electronics the intensity is typically measured in volts. In FTICR and Orbitraps the frequency domain signal (the y-axis) is related to the power (~amplitude squared) of the signal sine wave (often reduced to an rms power); however, the axis is usually not labeled as such for many reasons. In most forms of mass spectrometry, the intensity of ion current measured by the spectrometer does not accurately represent relative abundance, but correlates loosely with it. Therefore, it is common to label the y-axis with "arbitrary units".
Railex was a refrigerated rail service and third-party logistics provider that transported fruits, vegetables and other temperature sensitive cargo across the United States, in partnership with CSX and Union Pacific. In 2006, Railex launched service between Wallula, Washington, and Rotterdam, New York, followed in 2008 by a Delano, California to NY lane. Railex ran unit trains of 55 large, "plate F" refrigerated cars and promised regularly scheduled departures and arrivals on a five-day service schedule. It claimed reduced carbon emissions when compared to conventional trucking. In June 2014, Railex opened a new facility in Jacksonville, Florida, with service from the west coast. In 2017, Union Pacific acquired Railex's cold storage facilities and terminals at Delano, California, Wallula, Washington, and Rotterdam, New York (but not its wine unit, Railex Wine Services LLC, now known as Northwest Wine Services). In May 2020, Union Pacific discontinued both services. Railex's system was based on palletized cargo, which was loaded and unloaded indoors in temperature controlled docks that preserved a cold chain for the cargo. It also provided warehousing and could handle less-than-truckload shipments.
Shortly before the Napoleonic Wars, the French government offered a hefty cash award of 12,000 francs to any inventor who could devise a cheap and effective method of preserving large amounts of food to create well-preserved military rations for the Grande Armée. The larger armies of the period required increased and regular supplies of quality food. Limited food availability was among the factors limiting military campaigns to the summer and autumn months. In 1809, Nicolas Appert, a French confectioner and brewer, observed that food cooked inside a jar did not spoil unless the seals leaked, and developed a method of sealing food in glass jars. Appert was awarded the prize in 1810 by Count Montelivert, a French minister of the interior. The reason for lack of spoilage was unknown at the time, since it would be another 50 years before Louis Pasteur demonstrated the role of microbes in food spoilage and developed pasteurization. The Grande Armée began experimenting with issuing canned foods to its soldiers, but the slow process of canning and the even slower development and transport stages prevented the army from shipping large amounts across the French Empire, and the wars ended before the process was perfected. Following the end of the Napoleonic Wars, the canning process was gradually employed in other European countries and the United States.
The enzyme characterised from Escherichia coli combines adenosine triphosphate and nicotinate mononucleotide to give deamido-NAD, a precursor to the coenzyme, nicotinamide adenine dinucleotide (NAD). Pyrophosphate (PPi) is a byproduct. In organisms which use this biosynthetic pathway to NAD, the final step is an amidation reaction. This enzyme belongs to the family of transferases, specifically those transferring phosphorus-containing nucleotide groups (nucleotidyltransferases). The systematic name of this enzyme class is ATP:nicotinate-ribonucleotide adenylyltransferase. Other names in common use include deamido-NAD+ pyrophosphorylase, nicotinate mononucleotide adenylyltransferase, deamidonicotinamide adenine dinucleotide pyrophosphorylase, NaMN-ATase, and nicotinic acid mononucleotide adenylyltransferase.
X-inactivation The process by which one of the two copies of the X chromosome is silenced by being irreversibly condensed into transcriptionally inactive heterochromatin in the cells of female therian mammals. A form of dosage compensation, X-inactivation prevents females from producing twice as many gene products from genes on the X chromosome as males, who only have one copy of the X chromosome. Which X chromosome is inactivated is randomly determined in the early embryo, making it possible for cell lineages with different inactive Xs to exist in the same organism.
Sources: en.wikipedia.org
The sequence is Met-Glu-His-Phe-Pro-Gly-Pro, a seven-residue peptide. The first four residues correspond to the ACTH(4-10) fragment, and Pro-Gly-Pro is added at the C-terminus. N-acetylated versions also appear in the literature and differ in mass.
Semax is a synthetic analog of the ACTH(4-10) fragment rather than a copy of the full hormone. Truncation plus the added tail removes the steroidogenic portion of ACTH. That distinction explains why it is studied for nervous-system effects instead of adrenal stimulation.
It is registered as a prescription product in Russia and has been used there clinically, chiefly by the intranasal route. No approval exists in the United States or the European Union. Availability elsewhere typically falls under research-chemical distribution, with varying purity documentation.
It is associated with the melanocortin receptor family, particularly subtypes found in the central nervous system. This interaction is separate from the adrenal pathway activated by full-length ACTH.