shelf life 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.
Last reviewed on 2026-03-08. Where a claim depends on a specific study, the study is described rather than over-claimed.
The proposed mechanism centres on neurotrophic signalling rather than direct receptor activation. Semax is reported to increase expression of brain-derived neurotrophic factor and nerve growth factor in several brain regions, and to shift the balance between excitatory and inhibitory neurotransmitter systems. Interaction with melanocortin receptors has been suggested because of the parent ACTH fragment. Many of these findings come from rodent studies, and the extent to which they translate to human physiology remains an open question.
Scientific literature on semax is unevenly distributed. A substantial share of published work originates from a small number of laboratories in Russia, while independent replication elsewhere is limited. Human data consist mostly of small trials with short follow-up, and several reported outcomes rely on subjective rating scales. Questions about how much intact peptide reaches the central nervous system after nasal administration, and how long it persists there, are still unresolved. The compound is best described as an active research subject rather than a settled pharmacological agent.
Semax is supplied as a lyophilized powder that appears white to off-white. It dissolves readily in water, phosphate-buffered saline, and other aqueous media, which simplifies preparation of working solutions for laboratory use. The nasal products registered in Russia are dilute aqueous solutions, typically around 0.1 percent peptide by weight. Organic solvents are rarely necessary and can complicate handling. Because the peptide is hygroscopic, weighing should be performed quickly and with minimal exposure to ambient humidity.
Solid material is normally kept at minus 20 degrees Celsius in a sealed, desiccated container. Reconstituted solutions are less stable and are usually divided into single-use aliquots before freezing. Repeated freeze-thaw cycles are avoided because they promote aggregation and loss of activity. Light exposure is minimized by using amber glassware or foil wrapping. Published stability data for this peptide are sparse, so recommended storage conditions rest mainly on general practice for short synthetic peptides rather than on dedicated study.
| Property | Value | Notes |
|---|---|---|
| Molecular formula | C37H51N9O10S | Calculated for the free peptide |
| Molar mass | 813.9 g/mol | Anhydrous free base |
| Peptide class | Synthetic heptapeptide | ACTH(4-10) analogue |
| Parent fragment | ACTH(4-10) | Adrenocorticotropic hormone segment |
| Developmental origin | Institute of Molecular Genetics, Moscow | Work began in the 1980s |
The parent fragment ACTH(4-10) carries the sequence Met-Glu-His-Phe-Arg-Trp-Gly. Semax replaces the arginine and tryptophan positions with a proline-glycine-proline tail, giving Met-Glu-His-Phe-Pro-Gly-Pro. That change removes residues associated with adrenal stimulation, so the peptide does not drive cortisol release the way full ACTH does. This distinction shapes how the compound is grouped in the literature, where it sits with neuropeptides and peptide neuromodulators rather than with corticosteroids.
Regulatory status varies sharply by country. Semax is registered for medical use in Russia, where it appears in formularies as a nasal solution, and it also holds registration in a small number of neighbouring states. It has no approval from the United States Food and Drug Administration or the European Medicines Agency, and it is not a scheduled controlled substance in most jurisdictions. Elsewhere it circulates mainly as laboratory material, so purity documentation comes from suppliers rather than from a national pharmacopoeia.
Published research has focused mainly on neurological and cognitive endpoints in animal models, with proposed mechanisms involving brain-derived neurotrophic factor and related signalling pathways. A substantial share of the human data originates from a limited number of research groups, and independent replication in other countries remains sparse. Regulatory status reflects that distribution: the peptide is registered as a medicine in Russia and appears in some neighbouring markets, while elsewhere it is handled as a research chemical without approved therapeutic labelling. Questions about dose-response relationships, long-term effects, and comparability across studies are still open.
Lyophilised powder is normally kept at -20 °C in a desiccated container, with some suppliers recommending -80 °C for long-term archival storage. Repeated freeze-thaw cycles are the most common cause of avoidable loss, so aliquoting before freezing reduces variability between working sessions. Dissolved peptide is far less stable than the dry solid and is usually prepared fresh or held briefly at 4 °C. Aqueous solutions support both hydrolysis of the backbone and oxidation of the N-terminal methionine, and these two routes dominate degradation under ordinary laboratory conditions.
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.
== Awards and honors == Fulbright fellowship for research in pediatric hematology Honorary Doctorate of Science from William Woods College (1972) Honorary service award from the Ohio State University Home Economics Alumni Association Honorary member of the Turkish Society of Hematology Selected as a "Woman of Achievement" by the Group Action Council of Metropolitan St. Louis (1947)
=== RNA polymerase II === Proline isomerization of certain prolines in RNA polymerase II is key in the process of recruiting and placing processing factors during transcription. PPIases target RNA polymerase II by interacting with the Rpb1 carboxy terminal domain, or CTD. Proline isomerization is then used as part of the mechanism of the CTD to recruit co-factors required for co-transcriptional RNA processing, regulating RNA polymerase II activity. Nrd1 is a protein that is responsible for many of the transcriptional activities of RNAP II, specifically through the Nrd1- dependent termination pathway. This pathway requires the parvulin Ess1, or Pin1 depending on the organism, to isomerize the pSer5-Pro6 bond in the CTD. Without the cis conformation of the pSer5-Pro6 bond, created by Ess1/Pin1, Nrd1 cannot bind to RNAP II. Any variation from this process leads to a decrease in Nrd1 binding affinity, lowering the ability of RNAP II to process and degrade noncoding RNAs.
== History == The group first came to the attention of record label Double T when they were finalist at Humo's Rock Rally, a prestigious Belgian rock contest, in 1996. Their first album was 1998's Little Things Of Venom (retitled At The Close Of Every Day for release in the United States). In 1999, after this album's success, they toured with Suede as well as opening for popular fellow Belgian band K's Choice. The following year they opened for Counting Crows on that band's European tour. 2001 brought extra fame for lead singer Steverlinck, who starred in the IMAX 3-D film Haunted Castle alongside Harry Shearer. The film also featured music by the band during the opening and closing credits. In 2002 the band released a second studio album, All Is Quiet Now, which was soon followed by a live album (Live in 2003). In 2008 their third studio album All Things Come in Waves was released. In 2009 Steverlinck was chosen by Arjen Lucassen as lead singer for a side project called Guilt Machine. 2010 saw the release of their fourth studio album Under the Cold Street Lights.
== Financial secrecy == The Financial Secrecy Index is published by the Tax Justice Network. It purports to rank jurisdictions according to their secrecy and the scale of their offshore financial activities. It is a tool for understanding global financial secrecy, tax havens, or secrecy jurisdictions, and illicit financial flows or capital flight. In the 2018 index, Thailand ranked 15 of 112 jurisdictions (1-most secretive; 112=least secretive). Switzerland ranked number one in the world. Other ranked ASEAN nations were: Singapore, 5; Malaysia, 31; Philippines, 40; Indonesia, 52; Brunei, 91.
== Further reading == Peter Harper; Lois Reynolds; Tilli Tansey, eds. (2010). Clinical Genetics in Britain: Origins and development. Wellcome Witnesses to Contemporary Medicine. History of Modern Biomedicine Research Group. ISBN 978-0-85484-127-1. Wikidata Q29581774.
Sources: en.wikipedia.org
=== Macro-TGA === In TGA, the sample is loaded first before the increase of temperature, and the heating rate is low (less than 100 °C min−1). Macro-TGA can use gram-scale samples to investigate the effects of pyrolysis with mass and heat transfer.
block or cube ice, slurry ice dry ice Gel or ice packs (often formulated for specific temperature ranges) Phase change materials (PCMs) Some products (such as frozen meat) have sufficient thermal mass to contribute to the temperature control and no excess coolant is required A digital Temperature data logger or a time temperature indicator is often enclosed to monitor the temperature inside the container for its entire shipment. Labels and appropriate documentation (internal and external) are usually required. Personnel throughout the cold chain need to be aware of the special handling and documentation required for some controlled shipments. With some regulated products, complete documentation is required.
Viserys was born in 77 AC as the eldest son of Prince Baelon Targaryen and his sister-wife Princess Alyssa Targaryen. Nine days after he was born, Alyssa took Viserys riding on her dragon Meleys. Viserys' younger brother Daemon was born in 81 AC, followed by a difficult labor for Alyssa when she delivered her third son Aegon, which resulted in both of their deaths within the year. Viserys claimed the legendary but elderly dragon Balerion at age sixteen in 93 AC, flying the dragon around King's Landing with great difficulty. Balerion would die a year later in 94 AC, and Viserys would never claim another dragon again. In the same year he claimed Balerion, Viserys married his cousin Aemma Arryn, though the marriage was not consummated for another two years when Aemma turned thirteen. The two had difficulty producing a child in their early marriage, as Aemma suffered several miscarriages and gave birth to a son who passed away in infancy. Ultimately, Aemma gave birth to their daughter Princess Rhaenyra in 97 AC. Baelon passed away in 101 AC, which led King Jaehaerys Targaryen to call the Great Council of 101 AC to determine the heir to the throne. As Baelon's son, Viserys' claim to the throne prevailed over the claims of Laenor Velaryon, Princess Rhaenys Targaryen, and Laena Velaryon by a rumored vote of 20-1. Following Jaehaerys' passing in 103 AC, Viserys ascended the throne and became the fifth king to rule over the Seven Kingdoms.
=== Evaluation of the Degree of Effectiveness of Biobeam Low Level Narrow Band Light on the Treatment of Skin Ulcers and Delayed Postoperative Wound Healing === The study conducted (in 1992) double blind clinical trial under regular hospital conditioned showed statistical significant results in the treatment with narrow band red light (660 nm) in comparison to placebo. It proved that low light narrow band has a significant role in the treatment of skin ulcers and delayed amputees and operative wounds.
Sources: en.wikipedia.org
Semax is based on the ACTH(4-10) fragment, a seven-amino-acid segment of adrenocorticotropic hormone. The synthetic peptide retains the core sequence while removing regions associated with endocrine activity. This modification is intended to isolate effects on the nervous system.
It is registered for clinical use in Russia and a few other countries, typically as a nasal drop formulation. It does not hold approval from the United States Food and Drug Administration or the European Medicines Agency. Outside those markets it is generally handled as a research chemical.
The compound was developed in Moscow and the earliest studies were conducted there, so the primary literature is largely in Russian-language journals. Translation and indexing have been incomplete, which limits access for outside researchers. Independent groups have since published some work, but the total volume remains modest.
Solid peptide is best kept frozen at about minus 20 degrees Celsius in a sealed container with desiccant. It should be allowed to reach room temperature before opening to prevent condensation. Repeated warming and cooling of the same vial is discouraged.