A practical reference on immunomodulator: what it is, how it behaves, what the literature reports, and where the honest uncertainties sit.
This page was last updated on 2025-09-24 and is reviewed periodically as new material appears.
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.
Thymosin alpha-1 is a short peptide of 28 amino acid residues first described in the 1970s as a component of thymic extracts. Its N-terminal residue carries an acetyl group, and the sequence is highly conserved across mammalian species. The peptide is not encoded as a standalone gene product; it is released by proteolytic cleavage from the N-terminus of prothymosin alpha, a larger acidic nuclear protein. That precursor relationship places it within a broader family of thymic and immune-associated peptides that have been studied for decades.
Identity and purity are usually assessed by reversed-phase high-performance liquid chromatography, which separates the target peptide from truncated or chemically modified byproducts. Mass spectrometry confirms the expected molecular mass and can indicate acetylation state or sequence errors. Amino acid analysis and peptide mapping supply complementary sequence-level information, while endotoxin testing is relevant for preparations intended for cell or animal work. Purity figures reported by suppliers refer to the method used and are not directly comparable across laboratories unless conditions are stated.
Lyophilized material is typically treated as a hygroscopic solid that should be brought to room temperature before the container is opened, which limits condensation on the powder. Reconstitution is commonly done with sterile water or a buffered diluent, and gentle mixing is preferred over vigorous agitation to reduce foaming and surface adsorption. Because peptides can bind to plastic and glass, diluents containing a small amount of carrier protein are sometimes used in laboratory work. Working solutions are generally aliquoted and prepared fresh rather than subjected to repeated freezing and thawing.
Stability depends on temperature, pH, and the number of freeze-thaw events the sample has experienced. Freeze-dried material is commonly held at -20 °C or colder, while reconstituted liquid is kept cold and used within a short window. Extreme pH and prolonged light exposure can promote deamidation, oxidation, or aggregation, particularly at asparagine and methionine positions. Adsorption to container walls can lower the measured concentration of a dilute solution even when the peptide molecules themselves remain intact.
| 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 |
The peptide occurs naturally in thymic tissue and has been detected in serum and other biological fluids. Reported concentrations are low, and reliable measurement generally requires immunoassay or mass spectrometry with an enrichment step. It is released from a larger precursor, prothymosin alpha, by proteolytic cleavage, although the enzymes involved are not fully characterized. Whether circulating levels reflect thymic output specifically remains an open question.
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.
Clinical research has examined the peptide in chronic hepatitis B and C, as a vaccine adjuvant, and in sepsis and oncology settings. Findings across trials are mixed; some report changes in selected immune markers, while others find no clear clinical benefit. Many studies are small and define outcomes differently, which limits comparison. Regulatory approval is confined to a few countries, and the compound is not an approved drug in the United States or most of Europe.
Overall evidence quality varies considerably. A large share of published reports come from single centers, rely on surrogate immunological markers, or lack adequate control groups. Systematic reviews have highlighted this heterogeneity as a barrier to pooling results. Open questions include which patients, if any, might benefit, what treatment duration is appropriate, and whether any effect is independent of standard care. The peptide is often described as an immune modulator rather than a therapy for one disease, which complicates confirmatory trial design.
Thymosin alpha 1 was identified in 1977 as a component of thymosin fraction 5, a heterogeneous preparation used in early studies of thymic function. Investigators purified the active material and determined its amino acid sequence, which enabled chemical synthesis. Work in the following decades concentrated on T-cell maturation and immune reconstitution in animals and small human cohorts. Early preparations varied in composition, so results from that period are difficult to compare with studies using defined synthetic peptide.
Quantifying thymosin alpha-1 in a sample usually relies on reverse-phase high-performance liquid chromatography. The peptide lacks strong chromophores, so detection often occurs at 214 nm, where the peptide backbone absorbs. Mass spectrometry provides confirmatory identification and can detect sequence variants or truncations. Immunoassays have been used in biological matrices, but they may cross-react with related fragments. For purity assessment, chromatographic peak area gives the main component percentage, while mass accuracy verifies molecular identity.
The lyophilized peptide is generally stable for extended periods when kept cold and dry. Once dissolved, aqueous solutions are less stable; hydrolysis, oxidation, and aggregation can degrade the material. Storage at -20 °C or lower slows these processes. Repeated freeze-thaw cycles are best avoided because they can promote aggregation. The exact shelf life depends on formulation, pH, and concentration, so stability studies are typically performed for each specific product.
== Awards == 2000 – National Bleeding Disorders Foundation, Researcher of the Year award 2009 – Foundation Fighting Blindness, Board of Directors Award 2010 – American Society of Gene and Cell Therapy, Outstanding Achievement Award 2014 – Human Gene Therapy, Pioneer Award 2018 – Sanford Health's $1 million Lorraine Cross Award for innovation in medicine and science, shared with Jean Bennett 2022 – American Society of Gene and Cell Therapy, Jerry Mendell Award for Translational Science 2022 – Children's Hospital of Philadelphia, Gold Medal for transformative impact on children's health through gene therapy 2026 – Breakthrough Prize in Life Sciences
Most nitrogenases contain an iron–molybdenum cofactor FeMoco, which is believed to contain either Mo(III) or Mo(IV). By contrast Mo(VI) and Mo(IV) are complexed with molybdopterin in all other molybdenum-bearing enzymes. Molybdenum is an essential element for all higher eukaryote organisms, including humans. A species of sponge, Theonella conica, is known for hyperaccumulation of molybdenum.
As Thiệu sensed Nixon's changing mood, on 24 October 1972, he called a press conference to denounce the draft agreement as a betrayal and stated that the Viet Cong "must be wiped out quickly and mercilessly". On 25 October 1972, Kissinger held a meeting with the journalist Max Frankel of the New York Times to predict that a peace agreement would occur in the next few days unless either North Vietnam or South Vietnam committed "a supreme act of folly". On October 26, North Vietnam published the draft agreement and accused the United States of trying to "sabotage" it by backing Thiệu. On the same day, Kissinger, who until then had never spoken to the media as National Security Advisor, called a press conference at the White House to say: "We believe peace is at hand. We believe an agreement is within sight". Kissinger later admitted that this statement was a major mistake, as it inflated hopes for peace while enraging Nixon who saw it as weakness. Nixon came very close to disavowing Kissinger, as he declared the draft peace agreement had "differences that must be resolved". Taking up Thiệu's cause as his own, Nixon wanted 69 amendments to the draft peace agreement to be included in the final treaty and ordered Kissinger back to Paris to force Tho to accept them. Kissinger regarded Nixon's 69 amendments as "preposterous," as he knew Tho would never accept them. By this point, Kissinger's relations with Nixon were tense, while Nixon's "German shepherds" Haldeman and Ehrlichman intrigued against him.
== Relationship with humans == While not under human threat, the Atlantic blue tang is caught for commercial fishing, but maintains little importance to Caribbean industry. It is also used, though rarely, as bait. It is also common in the aquarium trade.
Linear polymers with periodic structure, low branching and stereoregularity (e. g. not atactic) have a semi-crystalline structure in the solid state. In simple polymers (such as polyethylene), the chains are present in the crystal in zigzag conformation. Several zigzag conformations form dense chain packs, called crystallites or lamellae. The lamellae are much thinner than the polymers are long (often about 10 nm). They are formed by more or less regular folding of one or more molecular chains. Amorphous structures exist between the lamellae. Individual molecules can lead to entanglements between the lamellae and can also be involved in the formation of two (or more) lamellae (chains than called tie molecules). Several lamellae form a superstructure, a spherulite, often with a diameter in the range of 0.05 to 1 mm. The type and arrangement of (functional) residues of the repeat units effects or determines the crystallinity and strength of the secondary valence bonds. In isotactic polypropylene, the molecules form a helix. Like the zigzag conformation, such helices allow a dense chain packing. Particularly strong intermolecular interactions occur when the residues of the repeating units allow the formation of hydrogen bonds, as in the case of p-aramid. The formation of strong intramolecular associations may produce diverse folded states of single linear chains with distinct circuit topology. Crystallinity and superstructure are always dependent on the conditions of their formation, see also: crystallization of polymers.
Sources: en.wikipedia.org
A symbiotic culture of bacteria and yeast (SCOBY) is a culinary symbiotic fermentation culture (starter) consisting of lactic acid bacteria (LAB), acetic acid bacteria (AAB), and yeast which arises in the preparation of sour foods and beverages such as kombucha. Beer and wine also undergo fermentation with yeast, but the LAB and AAB components unique to the SCOBY are usually viewed as a source of spoilage rather than a desired addition. Both LAB and AAB enter on the surface of barley and malt in beer fermentation and grapes in wine fermentation; LAB lowers the pH of the beer or wine while AAB takes the ethanol produced from the yeast and oxidizes it further into vinegar, resulting in a sour taste and smell. AAB are also responsible for the formation of the cellulose SCOBY. SCOBY most accurately refers to the culture of bacteria and yeast suspended in the fermentation media, but it also is commonly used to refer to the gelatinous biofilm or microbial mat found floating at the container's air–liquid interface. This bacterial cellulose mat is referred to as a pellicle, and consists of a dense cellulose matrix with embedded bacteria and yeast cultures. SCOBY pellicles, like other fermentation starters, can serve the purpose of continuing the fermentation process into a new vessel and reproducing the desired product. This is done by introducing some of the previous culture to new, unfermented media.
== June 6, 1915 (Sunday) == Third Battle of Krithia — British general Aylmer Hunter-Weston managed to reorganize the Allied forces into an effective defense on the coast of Gallipoli and beat back the Ottoman defense, inflicting 3,000 casualties and forcing a stalemate. Second Battle of Artois — The French captured the main road leading to Neuville-Saint-Vaast, France. British carrier SS Immingham was lost in the Mediterranean Sea. Switzerland held a referendum on a war tax with most voters, over 450,000 (94 percent of electorate), in favor on implementing the one-off tax and over 27,000 against (about 6 percent). It was the first time a referendum has passed in every Swiss canton. The BHP Newcastle Steelworks opened in Newcastle, New South Wales, Australia. The London Underground extended the Bakerloo line with a new tube station at Maida Vale. The Icelandic sports club Þór Akureyri was established, and now encompasses teams for association football, basketball, handball and taekwondo.
==== Education and intelligence ==== Research suggests neither a good education nor a high IQ reliably increases happiness. Anders Ericsson argued an IQ above 120 has a decreasing influence on success. Presumably, IQs above 120 do not additionally cause other happiness indicators like success (with the exception of careers like Theoretical physics, where high IQs are more predictive of success). Above that IQ level, other factors, like social skills and a good mentor, matter more. As these relate to happiness, intelligence and education may simply allow one to reach a middle-class level of need satisfaction (as mentioned above, being richer than this seems to hardly affect happiness). According to the findings of the study, Using Theatrical Concepts for Role-plays with Educational Agents by Klesen, she expresses how role- playing embeds information and educational goals and causes people to learn unintentionally. Studies have shown that enjoyment in things as simple as role playing increases a person's IQ and their happiness. Martin Seligman has said: "As a professor, I don't like this, but the cerebral virtues—curiosity, love of learning—are less strongly tied to happiness than interpersonal virtues like kindness, gratitude and capacity for love."
Viola canina – heath dog violet Viola hirta – hairy violet Viola labradorica – alpine violet Viola odorata – sweet violet Viola persicifolia – fen violet Viola riviniana – common dog violet Viola rostrata – long-spurred violet Viola sororia – common blue violet, hooded violet Section Xylinosium
== History == During the Soyuz 6 mission of 1969, Russian cosmonauts performed the first welding experiments in space. Three different welding processes were tested using a hardware unit called Vulkan. The tests included welding aluminum, titanium, and stainless steel. The Skylab mission, launched in May 1973, served as a laboratory to perform various space manufacturing experiments. The station was equipped with a materials processing facility that included a multi-purpose electric furnace, a crystal growth chamber, and an electron beam gun. Among the experiments to be performed was research on molten metal processing; photographing the behavior of ignited materials in zero-gravity; crystal growth; processing of immiscible alloys; brazing of stainless steel tubes, electron beam welding, and the formation of spheres from molten metal. The crew spent a total of 32 man-hours on materials science and space manufacturing investigation during the mission. The Space Studies Institute began hosting a bi-annual Space Manufacturing Conference in 1977 . Microgravity research in materials processing continued in 1983 using the Spacelab facility. This module has been carried into orbit 26 times aboard the Space Shuttle, as of 2002. In this role the shuttle served as an interim, short-duration research platform before the completion of the International Space Station.
Sources: en.wikipedia.org
The government confronted the newly elected Reichstag with the Enabling Act of 1933 that would have vested the government with legislative powers for a period of four years. As the bill required a two-thirds majority in order to pass and the coalition parties only controlled 340 of the 647 seats (52.5 percent), the government needed the support of other parties. The Centre Party, whose vote was going to be decisive, was split on the issue of the Enabling Act. Chairman Kaas advocated supporting the bill in parliament in return for government guarantees. These mainly included respecting the President's Office retaining veto power, religious liberty, its involvement in culture, schools and education, the concordats signed by German states and the existence of the Centre Party. Via Papen, Hitler responded positively and personally addressed the issues in his Reichstag speech but he repeatedly put off signing a written letter of agreement. Kaas was aware of the doubtful nature of such guarantees but when the Centre Party assembled on 23 March to decide on their vote, Kaas advised his fellow party members to support the bill, given the "precarious state of the party". He described his reasons as follows: "On the one hand we must preserve our soul, but on the other hand a rejection of the Enabling Act would result in unpleasant consequences for fraction and party. What is left is only to guard us against the worst. Were a two-thirds majority not obtained, the government's plans would be carried through by other means. The President has acquiesced in the Enabling Act.
Quercetin has a bitter flavor and is used as a food additive and in dietary supplements. Hinokitiol (ß-thujaplicin) is used in commercial products for skin, hair and oral care, insect repellents and deodorants. It is also used as a food additive, shelf-life extending agent in food packaging, and wood preservative in timber treatment. Polyene antimycotics, such as nystatin, natamycin and amphotericin B, are a subgroup of macrolides and are widely used antifungal and antileishmanial medications. These drugs act as ionophores by binding to ergosterol in the fungal cell membrane and making it leaky and permeable for K+ and Na+ ions, as a result contributing to fungal cell death. Carboxylic ionophores, i.e., monensin, lasalocid, salinomycin, narasin, maduramicin, semduramycin and laidlomycin, are marketed globally and widely used as anticoccidial feed additives to prevent and treat coccidiosis in poultry. Some of these compounds have also been used as growth and production promoters in certain ruminants, such as cattle, and chickens, however this use has been mainly restricted because of safety issues. Zinc ionophores have been shown to inhibit replication of various viruses in vitro, including coxsackievirus, equine arteritis virus, coronavirus, HCV, HSV, HCoV-229E, HIV, mengovirus, MERS-CoV, rhinovirus, SARS-CoV-1, Zika virus.
Immunogen — an antigen that is capable of inducing an immune response, i.e., it is immunogenic. Antigen is often used interchangeably with this term, but this is not, strictly speaking, correct. All immunogens are antigens, but not all antigens are immunogens. The antigen within a vaccine is often referred to as an immunogen, even if, strictly speaking, its purified form cannot induce immune responses (requiring adjuvants to do so). For simplicity, many sources use the term "antigen" in place of "immunogen," but these terms should not be regarded as interchangeable. Allergen – A substance capable of causing an allergic reaction in sensitized individuals. The reaction may result after exposure via ingestion, inhalation, injection, or contact with skin. Tolerogen – A substance that invokes immune tolerance. This property is related to its molecular properties and circumstances such as route of administration. Superantigen – A class of antigens that cause non-specific activation of T-cells, resulting in polyclonal T-cell activation and massive cytokine release. Immunoglobulin-binding protein – Proteins such as protein A, protein G, and protein L that are capable of binding to antibodies at positions outside of the antigen-binding site (paratope). These are sometimes known as B cell superantigens. Epitope – The specific part of an antigen that is bound by an antibody (or T cell receptor), its antigenic determinant.Antigenic molecules, normally "large" biological polymers, usually present surface features that can act as points of interaction for specific antibodies.
=== Domestic affairs === Mahathir had promised to "restore the rule of law", and reopen investigations into the 1Malaysia Development Berhad scandal, telling the press that Najib would face consequences if found guilty of corruption. Mahathir instructed the Department of Immigration to bar Najib and his wife, the notoriously extravagant Rosmah Mansor, from leaving the country after they attempted to fly to Indonesia. Mahathir formed his cabinet of 29 ministers in June 2018. He abolished the unpopular Goods and Services Tax, reducing it from six to zero per cent. Mahathir implemented a "no gifts policy," stating that he would only accept food, flowers, and fruits, while prohibiting government officials from receiving any other gifts to prevent corruption. He also vowed to cut fiscal spending by firing thousands of civil servants, cancelling an expensive Kuala Lumpur–Singapore high-speed rail link and cutting back on large infrastructure projects initiated under Najib. Malaysia's freedom of the press improved slightly under Mahathir's tenure, and the country's rank rose in the Press Freedom Index. The government announced palm oil cultivation would be limited to 6.55 million hectares by 2023, and began a lobbying campaign to improve palm oil's reputation abroad. On 20 June 2018, Mahathir met the father of murdered Mongolian woman Altantuya Shaariibuu and agreed that the case of her murder should be reopened.
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.
Cold storage slows the chemical degradation reactions that occur in solution. Lyophilized powder is more stable than reconstituted liquid and tolerates longer storage periods. Repeated temperature cycling should still be avoided because it can drive aggregation and loss of material.