This is a working overview of peptide storage, written for readers who want more than a one-paragraph summary but less than a textbook.
This page was last updated on 2026-08-01 and is reviewed periodically as new material appears.
The compound has been investigated as an adjunct in chronic viral hepatitis and as a vaccine adjuvant, with results that vary by study design and population. Regulators in some countries have approved a synthetic form for specific indications, while other agencies have not. Whether the peptide produces consistent clinical benefit across diverse patient groups is still an open question, and many trials have been small. Its status is therefore best described as investigational in many contexts and established only narrowly.
The name itself causes confusion, because several unrelated thymic peptides share the thymosin label. Thymosin beta-4, for example, is a different molecule with different functions. Naming conventions in the literature also mix descriptive research terms with assigned nonproprietary names, so a reader should confirm which entity a given paper addresses. Clarifying that point is usually the first step in interpreting any claim about this peptide.
Early work on thymic extracts in the 1960s described a heat-stable acidic fraction containing many polypeptides. Separation of that mixture yielded individual components, and thymosin alpha-1 was named as one of them on the basis of assays for T-cell activity. The first preparations came from calf thymus, while subsequent research and clinical material has been chemically synthesized. Nomenclature in older papers is inconsistent, and the same peptide sometimes appears under different designations, which complicates literature searches.
Most published studies on thymosin alpha-1 report changes in immune measurements rather than clinical outcomes, and findings differ across designs and populations. Whether the peptide signals through one defined receptor or through several less specific interactions remains an open question. Its reported circulation half-life of a few hours complicates comparison of dosing schedules across trials. Mechanistic claims are frequently drawn from isolated cell cultures, and how far those results extend to whole organisms is unresolved.
| Property | Value | Notes |
|---|---|---|
| Residue count | 28 amino acids | Acetyl group on the first residue |
| Approximate molecular mass | 3108 daltons | Calculated from the consensus sequence |
| Origin | Cleavage product of prothymosin alpha | Not encoded as a separate gene product |
| Primary research focus | Immune modulation | Studied in viral hepatitis and as a vaccine adjuvant |
| Common synonyms | Thymalfasin, Tα1, thymosin alpha 1 | Thymalfasin is the assigned nonproprietary name |
Laboratory supplies of the peptide usually arrive as a lyophilized powder in sealed vials. The powder is hygroscopic, so a vial should be allowed to reach room temperature before it is opened to prevent condensation on the contents. Weighing and transfer are best performed in a low-humidity environment with clean tools. Once dissolved, the solution should be mixed gently rather than vortexed, because foaming and shear can reduce recovery of the peptide.
Storage recommendations center on low temperature, dryness, and protection from repeated freezing and thawing. The intact powder is commonly held at 20 degrees below zero Celsius or colder, while a working solution is divided into single-use aliquots to limit freeze-thaw cycles. Buffered saline or phosphate-buffered saline at neutral pH is frequently used as a diluent. Light sensitivity is not well documented, yet amber vials or foil wrapping are common practice for long-term storage of peptide stocks.
胸腺素α1（thymosin alpha 1，Tα1）是一种由28个氨基酸组成的酸性肽，N端被乙酰化，分子量约为3108道尔顿。该肽最早从牛胸腺组织提取物中分离，属于胸腺素组分5的一个成分。其序列在不同哺乳动物中高度保守，提示其具有基本的生物学功能。名称中的“α1”指其在电泳中的迁移位置，并非表示亚型编号。它既存在于胸腺，也存在于脾脏和淋巴结等免疫组织。
20世纪70年代，研究者从胸腺提取物中纯化出多种小肽，Tα1是其中被较早表征的一种。最初的制备依赖组织匀浆和层析步骤，产量低且成分复杂。随着固相肽合成技术成熟，实验室和工业界能够生产与天然序列一致的合成版本。合成肽的纯度可达95%以上，并可通过反相高效液相色谱和质谱进行鉴定。这一转变使研究不再依赖动物胸腺来源。
市售的胸腺素α1通常以冻干粉形式提供，溶解后用于注射。其氨基酸组成包括多个酸性残基，因此在中性pH下带负电荷。该肽可溶于水和生理盐水，但在有机溶剂中溶解度有限。储存条件通常为冻干状态下负20摄氏度，溶解后需冷藏并避免反复冻融。常见的同义词包括胸腺肽α1、thymalfasin和Tα1。
Thymosin alpha 1 is a 28-amino-acid peptide first isolated from thymosin fraction 5, a bovine thymic extract. Its sequence begins with an acetylated serine residue and carries a high proportion of acidic residues, so the molecule has a net negative charge near neutral pH. Despite the shared name, it is unrelated in sequence to the thymosin beta family. Synthetic material prepared by solid-phase peptide synthesis is identical in sequence to the natural peptide.
Several names appear in the literature for this peptide, including thymalfasin and the abbreviation T-alpha-1. Naming conventions differ among research articles, regulatory documents, and supplier catalogs, which complicates literature searches. Both synthetic and recombinant production routes yield a peptide with the same 28-residue sequence as the thymic isolate. Because the thymosin label also covers unrelated peptides, sources should be compared by sequence rather than by name alone.
The peptide was identified during work in the 1970s on thymosin fraction 5, a partially purified extract of calf thymus. Investigators separated that mixture and characterized individual components, one of which they named thymosin alpha-1. The same compound later received the international nonproprietary name thymalfasin. Commercial material is produced by solid-phase peptide synthesis rather than by extraction, so synthetic and natural forms share an identical sequence. Naming conventions vary across the literature, and readers should distinguish the alpha-1 peptide from other thymosins that have unrelated sequences and functions.
Thymosin beta-4 is a separate 43-residue peptide that binds actin and participates in cell migration; it shares no sequence similarity with thymosin alpha-1 despite the common family name. Other preparative materials, such as thymosin fraction 5 and thymopoietin, contain distinct mixtures or peptides. The shared thymosin label reflects the tissue of origin used in early purification, not a common structural core. Treating these molecules as interchangeable is a frequent source of confusion in laboratory reports and in popular summaries alike.
The Lima Group has not issued any pronouncement since January 5 of this year, and that one does not even belong to the current management." No other country has mentioned the non-existence of the Lima Group.
is the outside diameter of the tube. The correlation constant C is 0.62 for horizontal cylinders and vertical plates, and 0.67 for spheres. Vapor properties are evaluated at film temperature. For stable film boiling on a horizontal surface, Berenson has modified Bromley's equation to yield,
=== Children === Prolonged use of prednisolone eye drops in children may lead to raised intraocular pressure. While this phenomenon is dose-dependent, it is shown to have a greater effect, especially in children under 6 years of age.
Durand sold the patent to Bryan Donkin, who spent two years perfecting the method. Canned food subsequently began to be issued to the Royal Navy. The reason for lack of spoilage was unknown at the time, since it would be until the 1860s before Louis Pasteur demonstrated the role of microbes in food spoilage and developed pasteurization. The Crimean War saw issues with supplying soldiers in battle. In the British Army, rations were regularly halved, and many soldiers developed scurvy, to the point that the hospital in Scutari received more soldiers for scurvy than battle wounds. During the American Civil War, the food and rations of the Union Army and the Confederate States Army were meant to be mostly the same—meat, cornmeal, vegetables, vinegar, molasses, and hardtack—but supply issues plagued the Confederates as the war continued, forcing them to live off the land. The standard Union Army ration was roughly three-quarters pound (340 g) of meat, one pound (450 g) of flour or cornmeal, vegetables, vinegar, and molasses. To ensure that food lasted longer, rations often came in the form of hardtack biscuits, salted meat, and dehydrated vegetables. During campaigns, particularly as Union troops entered the south, seasonal fruits and vegetables were pillaged from farms and orchards. Both the Union and Confederate armies relied on lakes and streams for their water.
Sources: en.wikipedia.org
The targets were said to have been Zdeněk Hřib, the mayor of Prague (capital of the Czech Republic), who was involved in renaming a square in Prague, "Pod Kaštany", where the Russian embassy is situated, to the Square of Boris Nemtsov, an opposition politician assassinated in the Kremlin in 2015; Ondřej Kolář, the mayor of Prague 6 municipal district, who was involved in removing the controversial statue to the Soviet-era Marshal Konev; and Pavel Novotný, the mayor of Prague's southwestern Řeporyje district. They all received police protection. Czech president Miloš Zeman later described the police protection of Zdeněk Hřib as an attempt by an insignificant politician to gain attention. Zeman also confused ricin with non-poisonous laxative castor oil. In 2018 and 2023 German police thwarted attempted ricin attacks, after tip-offs believed to have come from the US FBI. In 2025, security agencies in the Indian state of Gujarat arrested three Muslim men allegedly plotting a terrorist attack using ricin.
=== Side effects === Side effects with anabolic agents are very serious and are not to be ignored. Side effects include: acne, blood clots, aggressiveness, hallucinations, mania, stomach pain, headaches, dizziness, high blood pressure, testicular or scrotal pain, premature male baldness, hear attack, stroke, and liver or kidney failure.
In the early years of constitutional government, the strengths and weaknesses of the Meiji Constitution were revealed. A small clique of Satsuma and Chōshū elite continued to rule Japan, becoming institutionalized as an extra-constitutional body of genrō (elder statesmen). Collectively, the genrō made decisions reserved for the Emperor, and the genrō, not the Emperor, controlled the government politically. Throughout the period, however, political problems usually were solved through compromise, and political parties gradually increased their power over the government and held an ever-larger role in the political process as a result. Between 1891 and 1895, Ito served as Prime Minister with a cabinet composed mostly of genrō who wanted to establish a government party to control the House of Representatives. Although not fully realized, the trend toward party politics was well established.
Sources: en.wikipedia.org
For the next several years, the band refused to perform together, out of respect for him. In 2005, Cantrell, Kinney, and Inez reunited for a benefit concert for victims of the 2004 Indian Ocean tsunami, with several vocalists filling in for Staley. Following positive response, the band decided to reunite formally in 2006. Comes with the Fall vocalist William DuVall, a member of Cantrell's solo touring band who often sang Staley's parts on the Alice in Chains songs that Cantrell performed, was announced to sing Staley's part for the reunion shows. In an interview with MTV News, Kinney noted that the band would use the reunion concerts to pay tribute to the songs and to Staley. The band used to have an intermission to include a five-minute filmed tribute to Staley in between sets. DuVall has since become Staley's full-time replacement in the band, contributing to three full-length releases.
At the top of the Communist Party was the Central Committee, elected at Party Congresses and Conferences. In turn, the Central Committee voted for a Politburo (called the Presidium between 1952 and 1966), Secretariat and the general secretary (First Secretary from 1953 to 1966), the de facto highest office in the Soviet Union. Depending on the degree of power consolidation, it was either the Politburo as a collective body or the General Secretary, who always was one of the Politburo members, that effectively led the party and the country (except for the period of the highly personalized authority of Stalin, exercised directly through his position in the Council of Ministers rather than the Politburo after 1941). They were not controlled by the general party membership, as the key principle of the party organization was democratic centralism, demanding strict subordination to higher bodies, and elections went uncontested, endorsing the candidates proposed from above. The Communist Party maintained its dominance over the state mainly through its control over the system of appointments. All senior government officials and most deputies of the Supreme Soviet were members of the CPSU. Of the party heads themselves, Stalin (1941–1953) and Khrushchev (1958–1964) were Premiers. Upon the forced retirement of Khrushchev, the party leader was prohibited from this kind of double membership, but the later General Secretaries for at least some part of their tenure occupied the mostly ceremonial position of Chairman of the Presidium of the Supreme Soviet, the nominal head of state.
During blood clotting, thrombin attacks the N-terminus of the Aα and Bβ chains in fibrinogen to form individual fibrin strands plus two small polypeptides, fibrinopeptides A and B derived from these respective chains. The individual fibrin strands then polymerize and are crosslinked with other fibrin strands by blood factor XIIIa to form an extensive interconnected fibrin network that is the basis for the formation of a mature fibrin clot. In addition to forming fibrin, fibrinogen also promotes blood clotting by forming bridges between, and activating, blood platelets through binding to their GpIIb/IIIa surface membrane fibrinogen receptor. Fibrin participates in limiting blood clot formation and degrading formed blood clots by at least two important mechanisms. First, it possesses three low affinity binding sites (two in fibrin's E domain; one in its D domain) for thrombin; this binding sequesters thrombin from attacking fibrinogen. Second, fibrin's Aα chain accelerates by at least 100-fold the amount of plasmin activated by tissue plasminogen activator; plasmin breaks-down blood clots. Plasmin's attack on fibrin releases D-dimers (also termed DD dimers). The detection of these dimers in blood is used as a clinical test for fibrinolysis.
Sources: en.wikipedia.org
It is usually classified as an immunomodulatory peptide rather than a classical hormone. It derives from the larger protein prothymosin alpha and acts mainly on immune cells. The thymosin label covers a group of distinct peptides, so the naming can be misleading.
The two share a family name but have different sequences, sizes, and functions. Thymosin beta-4 is a 43-residue peptide associated with actin binding and cell migration. Thymosin alpha-1 is a 28-residue peptide linked mainly to immune signaling.
Thymalfasin is the assigned international nonproprietary name for the synthetic 28-residue peptide. Thymosin alpha-1 is the descriptive research name for the same molecule. Which term appears depends on the context and the regulatory document.
Its sequence corresponds to the amino-terminal portion of prothymosin alpha, a larger protein present in many cell types. The isolated 28-residue peptide is a fragment of that protein rather than a separately encoded molecule, and laboratory material is produced by synthesis.