If you have been reading about thymosin alpha 1 and want a single page that covers the useful parts, this is it: definitions, context, how it is studied, and the questions that come up repeatedly.
Updated 2026-08-01. Numbers and descriptions here follow the published literature rather than marketing material.
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.
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.
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.
| 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 |
Identity and purity are normally confirmed by reversed-phase high-performance liquid chromatography and mass spectrometry. The expected mass for the acetylated 28-residue peptide is close to 3108 daltons, and a mass shift indicates a modification or truncation. Peptide mapping after enzymatic digestion can resolve sequence-level questions. Counter-ion content, water content, and residual solvents are separate quality attributes that a certificate of analysis may or may not report. Aggregation is monitored by size-exclusion chromatography when relevant.
Thymosin alpha-1 is supplied as a lyophilized powder in most research settings. The solid dissolves readily in water and in common aqueous buffers, and it is typically reconstituted shortly before use. Solutions are clear and colourless at ordinary working concentrations. Because the peptide is hygroscopic, weighing and reconstitution are usually performed with minimal exposure to ambient air. Aliquots are prepared to avoid repeated freeze-thaw cycles, and working solutions are kept cold.
Long-term storage is generally at minus twenty degrees Celsius or colder, preferably desiccated and protected from light. Lyophilized material is more stable than reconstituted solution, which degrades faster at room temperature. Stability depends on pH, ionic strength, and the presence of oxidising agents. Published stability data for the peptide are limited, so storage claims in catalogues should be treated as general guidance rather than measured guarantees. Freeze-thaw cycles are kept to a minimum.
Clinical interest has centered on chronic viral hepatitis, on immune restoration in various conditions, and on use as an adjuvant intended to improve responses to vaccines. Trials have reported mixed results, and regulatory status differs sharply between countries; in some places it is a prescription product, while elsewhere it is sold without an approved therapeutic indication. Because published studies vary widely in design, population, and endpoints, comparisons across them are difficult and no single conclusion covers the whole literature.
Thymosin alpha 1 is a short peptide of 28 amino acid residues that derives from the amino terminal region of a larger precursor protein known as prothymosin alpha. The peptide carries an acetyl group on its first residue and contains no disulfide bonds or carbohydrate chains. Its sequence is highly conserved across mammalian species, which is one reason laboratories treat it as a molecule with a defined and reproducible structure rather than a variable tissue extract. The name follows an early naming convention for thymus-derived fractions and does not imply that the peptide acts as a hormone in the classical endocrine sense.
Biologically, the peptide is studied mainly in the context of immune cell development and regulation. It is produced in the thymus and in several other tissues, and it appears to influence the maturation and activity of T cells and other immune populations. Laboratory work describes effects on cytokine production, on the balance between T cell subsets, and on the function of dendritic cells. Much of this evidence comes from cell culture and animal models, so the extent to which the same pathways operate in humans remains an open question.
Identity and purity are assessed with a small set of standard peptide methods. Reversed-phase high-performance liquid chromatography separates the main peak from truncated or oxidized species, and its area percentage is the usual purity measure. Mass spectrometry confirms the observed molecular mass against the expected value, while amino acid analysis or peptide mapping checks composition and sequence. Specifications for research-grade material are often stated as 95 percent or higher, though the exact limit depends on the supplier and the intended use.
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.
Every mission demonstrated the ability to adjust the crafts' inclination and apsis without issue. Gemini 5 demonstrated eight-day endurance, long enough for a round trip to the Moon. Gemini 7 demonstrated a fourteen-day endurance flight. Gemini 6A demonstrated rendezvous and station-keeping with Gemini 7 for three consecutive orbits at distances as close as 1 foot (0.30 m). Gemini 9A also achieved rendezvous with an Agena Target Vehicle (ATV). Rendezvous and docking with the ATV was achieved on Gemini 8, 10, 11, and 12. Gemini 11 achieved the first direct-ascent rendezvous with its Agena target on the first orbit. Extravehicular activity (EVA) was perfected through increasing practice on Gemini 4, 9A, 10, 11, and 12. On Gemini 12, Edwin "Buzz" Aldrin spent over five hours working comfortably during three (EVA) sessions, finally proving that humans could perform productive tasks outside their spacecraft. Gemini 10, 11, and 12 used the ATV's engine to make large changes in its orbit while docked. Gemini 11 used the Agena's rocket to achieve a crewed Earth orbit record apogee of 742 nautical miles (1,374 km). Gemini 8 experienced the first in-space mission abort on March 17, 1966, just after achieving the world's first docking, when a stuck or shorted thruster sent the craft into an uncontrolled spin. Command pilot Neil Armstrong was able to shut off the stuck thruster and stop the spin by using the re-entry control system. He and his crewmate David Scott landed and were recovered safely. Most of the novice pilots on the early missions would command the later missions.
Pakistan's diverse geography and climate host a wide array of wildlife. Covering 881,913 km2 (340,509 sq mi), Pakistan ranks as the 33rd-largest nation by total area, but this varies based on Kashmir's disputed status. Pakistan boasts a 1,046 km (650 mi) coastline along the Arabian Sea and the Gulf of Oman, and shares land borders totalling 6,774 km (4,209 mi), including 2,430 km (1,510 mi) with Afghanistan, 523 km (325 mi) with China, 2,912 km (1,809 mi) with India, and 909 km (565 mi) with Iran. It has a maritime border with Oman and is separated from Tajikistan via the narrow strip of the Wakhan Corridor. Situated at the crossroads of South Asia, the Middle East, and Central Asia, Pakistan's location is geopolitically significant. Geologically, Pakistan lies at the interaction of the Indian and Eurasian tectonic plates within the Indus–Tsangpo Suture Zone, a region of high seismic activity. The collision between these two plates occurs in northwest Pakistan, particularly in Khyber Pakhtunkhwa. Sindh and Punjab are located on the north-western corner of the Indian Plate, while Balochistan and much of Khyber Pakhtunkhwa lie along its north-western margin. Northern areas of Pakistan, including Azad Kashmir, lie along the northern edge of the Indian Plate and are prone to powerful earthquakes.
In addition to Trinidad and Tobago, on 19 November, CNN described the Dominican Republic, El Salvador, Guyana, Panama, and Puerto Rico as supportive of the US military effort, and Argentina, Ecuador, and Paraguay as having "shown political support". The United Kingdom stated they provided logistical support to the US forces in apprehending a sanctioned vessel.
== Occurrence in foods and beverages == 2,5-Diketopiperazines are often formed during cooking from naturally occurring oligopeptides in foodstuffs. They have been detected in foods such as stewed beef, beer, barley bread, Awamori, dark chocolate, coffee and Comté cheese. 2,5-diketopiperazines have been shown to be important sensory compounds that help to influence the taste of a food product. The proline derived 2,5-diketopiperazines are the most abundant and structurally diverse class of 2,5-diketopiperazines found in food. The valine derivative cyclo(L-Val-L-Pro) at a concentration of 1742 ppm, was identified as the most important bitter 2,5-diketopiperazine contributing to the bitter taste of roasted cocoa. It has also been found as one of the major 2,5-diketopiperazines in autolyzed yeast extract and stewed beef and is also present in chicken essence and coffee. It has also been isolated from a variety of marine microorganisms and has been identified as an active LasI quorum-sensing signal molecule important for the plant growth promotion by Pseudomonas aeruginosa. The most studied of all the simple 2,5-diketopiperazines is the histidyl-proline 2,5-diketopiperazine cyclo(L-His-L-Pro) which is found in a variety of foods, with particularly high concentrations in fish and fish products. It is well absorbed orally, and crosses the blood–brain barrier via a non-saturable mechanism.
Peptides can perform interactions with proteins and other macromolecules. They are responsible for numerous important functions in human cells, such as cell signaling, and act as immune modulators. Indeed, studies have reported that 15-40% of all protein–protein interactions in human cells are mediated by peptides. Additionally, it is estimated that at least 10% of the pharmaceutical market is based on peptide products.
Sources: en.wikipedia.org
=== Animal rights === Barker was a vegetarian. In 1982, Barker began ending The Price Is Right episodes with the phrase: "This is Bob Barker reminding you to help control the pet population – have your pets spayed or neutered." Though Barker had already been dabbling in animal rights before meeting Burnet, his efforts became more aggressive during his relationship with her. In 1987, Barker requested the removal of fur prizes for the Miss USA pageant and stepped down as host when the producers refused. In 1989, Barker and United Activists for Animal Rights publicly accused several media projects and the American Humane Association of animal mistreatment and condoning animal mistreatment, a tactic which resulted in a $10 million suit against him and the UAAR for libel, slander, and invasion of privacy. The suit was finally settled by the insurer in 1994. Barker founded DJ&T Foundation in 1994, named after his late wife and mother, which has contributed millions of dollars to animal-neutering programs and funded animal rescue and park facilities all over the United States. In 2004, Barker donated $1 million (equivalent to $1.7 million in 2025) to Columbia Law School to support the study of animal rights. In 2009, Barker wrote a letter about three businesses in Cherokee, North Carolina, asking them to close their bear exhibits. He threatened to not attend the 2009 Game Show Awards, where Barker was to receive a lifetime achievement award, because Betty White would be attending.
Natural nitrogen (7N) consists of two stable isotopes: the vast majority (99.62%) of naturally occurring nitrogen is nitrogen-14, with the remainder (0.38%) being nitrogen-15. Thirteen radioisotopes are also known, with atomic masses ranging from 9 to 23, along with three nuclear isomers. All of these radioisotopes are short-lived, the longest-lived being 13N with a half-life of 9.965 minutes. All of the others have half-lives shorter than ten seconds. Isotopes lighter than the stable ones generally decay to isotopes of carbon, and those heavier beta decay to isotopes of oxygen. Nitrogen-13 is a positron emitter and one of the main isotopes used in medical PET scans.
=== Discontinued development === On August 18 and September 12, 2014, Oncothyreon and Merck KGaA, respectively, reported that a randomized Phase 1/2 study, EMR 63325–009, of tecemotide compared to a placebo in Japanese patients with Stage III non-small cell lung cancer did not meet its primary endpoint of an improvement in overall survival, and no treatment effect was seen in any of the secondary endpoints (progression-free survival, time to progression, or time to failure). Merck made the recommendation to stop the investigational treatment of patients in the EMR 63325-009 study in Japan. Furthermore, Merck KGaA announced its decision to discontinue the Phase III START2 and INSPIRE studies, and all other Merck-sponsored clinical trials with tecemotide in NSCLC, worldwide. Merck will continue to supply tecemotide for ongoing investigator-sponsored trials in other indications in accordance with their agreements with the sponsors of these studies.
There are pharmacies in Europe that have been in operation since medieval times. In Florence, Italy, the director of the museum in the former Santa Maria Novella pharmacy says that the pharmacy there dates back to 1221. In Trier (Germany), the Löwen-Apotheke is in operation since 1241, the oldest pharmacy in Europe in continuous operation. In Dubrovnik (Croatia), a pharmacy that first opened in 1317 is located inside the Franciscan monastery: it is the 2nd oldest pharmacy in Europe that is still operating. In the Town Hall Square of Tallinn (Estonia), there is a pharmacy dating from at least 1422. The medieval Esteve Pharmacy, located in Llívia, a Catalan enclave close to Puigcerdà, is a museum: the building dates back to the 15th century and the museum keeps albarellos from the 16th and 17th centuries, old prescription books and antique drugs.
=== Burns === The Healing Foundation facilitated the establishment of two research centres dedicated to burns. The first, situated at Frenchay Hospital in Bristol, aimed to develop innovative techniques for burn prevention and enhance clinical care for affected children. The Centre for Children's Burns Research was officially opened in June 2013 by Sophie, Duchess of Edinburgh. Subsequently, another research hub, the Healing Foundation Centre for Burns Research, was inaugurated at Queen Elizabeth Hospital in Birmingham in October 2013. A notable outcome of The Healing Foundation Centre for Children's Burns Research was the SmartWound PREDICT Dressing, developed by scientists at the University of Bath. This dressing changes colour upon detecting bacteria, providing an alternative method for infection detection.
Sources: en.wikipedia.org
Portable water purification devices are self-contained, easily transported units used to purify water from untreated sources (such as rivers, lakes, and wells) for drinking purposes. Their main function is to eliminate pathogens, and often also suspended solids and some unpalatable or toxic compounds. These units provide an autonomous supply of drinking water to people without access to clean water supply services, including inhabitants of developing countries and disaster areas, military personnel, campers, hikers, and workers in wilderness, and survivalists. They are also called point-of-use water treatment systems and field water disinfection techniques. Techniques include heat (including boiling), filtration, activated charcoal adsorption, chemical disinfection (e.g. chlorination, iodine, ozonation, etc.), ultraviolet purification (including sodis), distillation (including solar distillation), and flocculation. Often these are used in combination.
The Sam and Ann Barshop Institute for Longevity and Aging Studies is a basic and clinical research institute located on the Greehey Academic and Research Campus of the University of Texas Health Science Center at San Antonio (UTHSCSA). It is a leading institute in the United States in geriatrics research. The Barshop Institute ranks #1 in National Institute on Aging funding among Texas institutions and is highly ranked in the country in National Institute of Health funding. The scientific director of the institute has been Elena Volpi, M.D., PhD, FGSA since July 2023. In 2009, one of the research projects of the institute was announced by Science magazine as one of the top scientific discoveries of the year. The Barshop Institute is home to several prestigious National Institute on Aging (NIA) research centers and programs, including the Nathan Shock Center, the Claude D. Pepper Older Americans Independence Center, the Center for Alzheimer's Disease and Related Dementias Population Aging and Social Studies, and the Interventions Testing Program. Collectively, these NIH-supported initiatives advance the Institute's mission to uncover the biological mechanisms of aging, develop interventions that prevent or treat age-related diseases, and promote healthier aging across the lifespan.
== External links == International Union of Pure and Applied Chemistry Archived 2007-10-31 at the Wayback Machine IUPAC Nomenclature Home Page, see especially the "Gold Book" containing definitions of standard chemical terms Interactive Mind Map of Chemistry / Chemical energetics Archived 2018-01-27 at the Wayback Machine
Librarian Ainsworth Rand Spofford, who directed the Library of Congress from 1865 to 1897, built broad bipartisan support to develop it as a national library and a legislative resource. He was aided by expansion of the federal government after the war and a favorable political climate. He began comprehensively collecting Americana and American literature, led the construction of a new building to house the library, and transformed the librarian of Congress position into one of strength and independence. Between 1865 and 1870, Congress appropriated funds for the construction of the Thomas Jefferson Building, placed all copyright registration and deposit activities under the library's control, and restored the international book exchange. The library also acquired the vast libraries of the Smithsonian and of historian Peter Force, strengthening its scientific and Americana collections significantly. By 1876, the Library of Congress had 300,000 volumes; it was tied with the Boston Public Library as the nation's largest library. It moved from the Capitol building to its new headquarters in 1897 with more than 840,000 volumes, 40 percent of which had been acquired through copyright deposit. A year before the library's relocation, the Joint Library Committee held hearings to assess the condition of the library and plan for its future growth and possible reorganization. Spofford and six experts sent by the American Library Association testified that the library should continue its expansion to become a true national library.
2GSH + H2O2 → GSSG + 2 H2O The two H atoms are donated by thiols in a process that begins with oxidation of a selenol side chain in GSH-Px. The organoselenium compound ebselen is a drug used to supplement the action of GSH-Px. It functions as a catalyst for the destruction of hydrogen peroxide. A related selenium-containing enzyme in some plants and in animals (thioredoxin reductase) generates reduced thioredoxin, a dithiol that serves as an electron source for peroxidases and also the important reducing enzyme ribonucleotide reductase that makes DNA precursors from RNA precursors.
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.
Trials differ in patient population, dose schedule, background treatment, and the endpoints used to judge success. Many are small and single-center, so random variation can dominate the reported effects.