A practical reference on Thymosin alpha 1: what it is, how it behaves, what the literature reports, and where the honest uncertainties sit.
Reviewed 2025-11-05. Anything still debated is marked as such rather than presented as settled.
Thymosin alpha-1 is a synthetic peptide of 28 amino acids whose sequence matches the amino-terminal region of prothymosin alpha. The chain is acetylated at its first residue and contains one disulfide bridge between two cysteine residues, which folds the molecule into a compact loop. Its molecular formula, C129H215N33O55, corresponds to a monoisotopic mass of roughly 3,106 daltons. Material used in laboratories is made by solid-phase synthesis rather than isolated from animal tissue.
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.
Immune signaling studies link thymosin alpha 1 to Toll-like receptor pathways, particularly TLR2 and TLR9, on dendritic cells and other antigen-presenting cells. Activation of these receptors promotes maturation of T cells and increases natural killer cell activity. The peptide shifts cytokine output toward a T helper 1 profile, raising interferon gamma and interleukin 2 while modulating interleukin 10. Whether these effects translate into clinical benefit for any specific disease remains a subject of debate. Reported outcomes vary across trials and populations.
Thymosin alpha 1 is approved as a medicine in several countries, including Italy and China, for indications such as chronic hepatitis B and as an immune adjuvant. It is not approved by the United States Food and Drug Administration as a therapeutic product. In research settings the peptide appears in studies of sepsis, vaccine response, and oncology support, often with mixed or inconclusive results. The evidence base is uneven, and reviews note that many trials were small. Regulatory status therefore differs widely between jurisdictions.
Thymosin alpha 1 is a synthetic 28-amino-acid peptide first isolated in 1966 from thymosin fraction 5, a bovine thymus extract. Its chain begins with an acetylated serine residue and ends with asparagine. The native peptide carries a molecular mass near 3,108 daltons. Researchers classify it as an immunomodulatory agent rather than a hormone with a single endocrine target. Early work framed it as a thymus-derived factor that supports T-cell maturation. The synthetic form used in research and clinical products matches the natural sequence.
| Property | Value | Notes |
|---|---|---|
| Class | Synthetic peptide | 28 residues; not a small-molecule compound |
| Molecular mass | About 3,106 Da | Monoisotopic mass of the unmodified chain |
| N-terminal group | Acetylated serine | Present in both native and synthetic forms |
| Secondary structure | Disulfide-constrained loop | One bridge between two cysteine residues |
| Typical source | Solid-phase synthesis | Early isolates came from bovine thymus extracts |
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.
Clinical research has examined the peptide in chronic hepatitis B and C, as a vaccine adjuvant, and in sepsis and oncology settings. Results across trials have been mixed, and several studies were small or conducted under differing protocols. Regulatory status varies by country, and the compound is not approved in every jurisdiction where it is studied. Evidence for any single indication should be read with attention to sample size and endpoint choice.
Thymosin alpha-1 is a 28-residue peptide first isolated from thymus tissue in the 1970s. It corresponds to the N-terminal portion of thymosin beta-4, from which it is cleaved in vivo. The peptide carries an acetyl group at its N-terminus, a modification that affects its charge and stability. Synthetic material produced by solid-phase peptide synthesis is chemically identical to the natural fragment and is the form used in research and clinical studies.
== Medical use == Aminocaproic acid (Amicar) is FDA-approved for use in the treatment of acute bleeding due to elevated fibrinolytic activity. It also carries an orphan drug designation from the FDA for the prevention of recurrent hemorrhage in patients with traumatic hyphema. In clinical practice, aminocaproic acid is frequently used off-label for control of bleeding in patients with severe thrombocytopenia, control of oral bleeding in patients with congenital and acquired coagulation disorders, control of perioperative bleeding associated with cardiac surgery, prevention of excessive bleeding in patients on anticoagulation therapy undergoing invasive dental procedures, and reduction of the risk of catastrophic hemorrhage in patients with acute promyelocytic leukemia.
North Branch, Minnesota: Specialty Press, 2010. ISBN 978-1-58007-152-9. O'Leary, Michael. USAAF Fighters of World War Two. New York: Sterling Publishing Co., 1986. ISBN 0-7137-1839-0. Oliver, David. P-51 Mustang. Amberley Publishing, 2023. ISBN 9781398110564. Olmsted, Merle. The 357th Over Europe: the 357th Fighter Group in World War II. St. Paul, Minnesota: Phalanx Publishing, 1994. ISBN 0-933424-73-6. Pace, Steve. "Mustang – Thoroughbred Stallion of the Air". Stroud, UK: Fonthill Media, 2012. ISBN 978-1-78155-051-9 Pearcy, Arthur. Lend-Lease Aircraft in World War II. Shrewsbury, UK: Airlife Publishing Ltd., 1996. ISBN 1-85310-443-4. "Pentagon Over the Islands: The Thirty-Year History of Indonesian Military Aviation". Air Enthusiast Quarterly (2): 154–162. n.d. ISSN 0143-5450. Sgarlato, Nico. "Mustang P-51" (in Italian). I Grandi Aerei Storici (Monograph series) N.7, November 2003. Parma, Italy: Delta Editrice. ISSN 1720-0636. Shores, Christopher. "The Allison-engined Mustang: A Fighting Combination". Air Enthusiast Quarterly, No. 2, n.d., pp. 191–206. ISSN 0143-5450 Sims, Edward H. Fighter Tactics and Strategy 1914–1970. Fallbrook, California: Aero publisher Inc., 1980. ISBN 0-8168-8795-0. Smith, J. Richard, Eddie J. Creek and Peter Petrick. On Special Missions: The Luftwaffe's Research and Experimental Squadrons 1923–1945 (Air War Classics). Hersham, Surrey, UK: Classic Publications, 2004. ISBN 1-903223-33-4. Spick, Mike. Fighter Pilot Tactics. The Techniques of Daylight Air Combat. Cambridge, UK: Patrick Stephens, 1983. ISBN 0-85059-617-3. Spick, Mike.
=== Receptor ectodomain shedding === When the extracellular domain of GHR is proteolytically cleaved (see: proteolytic cleavage) from the rest of the receptor protein, the extracellular domain is released as the water-soluble, carrier protein GHBP. As the extracellular domain alone, the polypeptide consists of 246 amino acids and is roughly 60 kDA in size. This cleaving process is called “receptor ectodomain shedding. In humans and rabbits, tumor-necrosis factor alpha converting enzyme (T.A.C.E.) is postulated to play a significant role in the post-translational processing activity that sheds GHBP from GHR. Studies show that this activity primarily occurs in the liver. When growth hormone is bound to two dimerized GH receptors, the shedding activity is inhibited. This occurs because when the ligand binds to the receptors, a conformational change occurs in them that potentially blocks the proteolytic activity of T.A.C.E.
A U.S. company named VAZTEC has created a compliant rotary valve sealing system that solves the friction and sealing problems of previous designs. They have built ten prototype engines from a 5.3L V-8 to a handheld 28cc four stroke. VAZTEC has also built a successful Diesel engine that contained the high compression pressures of a compression ignition engine (20:1 compression ratio, 100 bar combustion pressure). They are working with various OE manufacturers to commercialize their design. Various patents cover the compliant seal, including U.S. Patent 9,903,239. A Computational Fluid Dynamics (CFD) model of the VAZTEC rotary valve can be viewed at this link.
Sources: en.wikipedia.org
== Quantification using two dimensional electrophoresis == Two-dimensional gel electrophoresis (2-DE) represents one of the main technologies for quantitative proteomics with advantages and disadvantages. 2-DE provides information about the protein quantity, charge, and mass of the intact protein. It has limitations for the analysis of proteins larger than 150 kDa or smaller than 5kDa and low solubility proteins. Quantitative MS has higher sensitivity but does not provide information about the intact protein. Classical 2-DE based on post-electrophoretic dye staining has limitations: at least three technical replicates are required to verify the reproducibility. Difference gel electrophoresis (DIGE) uses fluorescence-based labeling of the proteins prior to separation has increased the precision of quantification as well as the sensitivity in the protein detection. Therefore, DIGE represents the current main approach for the 2-DE based study of proteomes.
In February 2019, Sergey Lavrov stated that the withdrawal from the INF Treaty would not lead to "a new Cold War". The Russian news agency TASS reported the Russian Foreign Minister Sergey Lavrov stating: "I don't think that we should talk about a new Cold War", adding that the US development of low-yield nuclear warheads (the first of which entered production in January 2019) had increased the potential for the use of nuclear weapons. Speaking to the press in Berlin on 8 November 2019, a day before the 30th anniversary of the fall of the Berlin Wall, US secretary of state Mike Pompeo warned of the dangers posed to the West by Russia and China. He said: "Today, Russia – led by a former KGB officer once stationed in Dresden [Vladimir Putin] – invades its neighbours and slays political opponents". Jonathan Marcus of the BBC opined that Pompeo "appeared to be declaring the outbreak of a second [Cold War]".
==== Season 4 ==== Months later, Logan remains estranged from his children. On the eve of the GoJo acquisition, Sandi and Stewy convince the siblings to delay the board vote to increase the price of the sale, forcing Logan to attempt reconciliation with his children. Kendall and Shiv refuse to budge, unsuccessfully demanding an apology from their father for his betrayal and his cruel parenting. Logan is then left no choice but to go to Sweden to renegotiate the deal with Matsson, but he suddenly dies on the flight from a pulmonary embolism, with only Tom and some of his other senior team by his side. Tom phones the children - who are attending Connor's wedding - to give them a chance to say goodbye. The plane is turned around and Logan is pronounced dead on arrival; the siblings make a statement announcing his death to the press, then watch as his body is removed from the plane. During Logan's wake, an undated document is found in his safe naming Kendall his successor upon his death, with several pencil addenda included, including a strike on "Kendall Roy" that could be either underlining or crossing-out the name. Kendall and Roman eventually decide to run the company together as co-CEOs, since the company's succession plan formally dictated leadership be passed down to COO - Roman's role at the time.
=== Americas === The Americas were more highly influenced by the Doctrine of Signatures than China, India, or Africa, most likely because of their colonial history with Europe. The majority of insect use in medicine is associated with Central America and parts of South America, rather than North America, and most of it is based on the medical techniques of indigenous peoples. Currently, insect medicine is practiced much more rarely than in China, India, or Africa, though it is still relatively common in rural areas with large indigenous populations. Some examples to follow: Chapulines, or grasshoppers, are commonly consumed as a toasted regional dish in some parts of Mexico, but they are also used medicinally. They are said to serve as diuretic to treat kidney diseases, to reduce swelling, and to relieve the pain of intestinal disorders when they are consumed. However, there are some risks associated with consuming chapulines, as they are known to harbor nematodes which may be transmitted to humans upon consumption. Much like the termites of Africa, ants were sometimes used as medicinal devices by the indigenous peoples of Central America. The soldier cast of the Army ant would be collected and used as living sutures by Mayans. This involved agitating an ant and holding its mandibles up to the wound edges; when it bit down, the thorax and abdomen were removed, leaving the head holding the wound together. The ant's salivary gland secretions were reputed to have antibiotic properties.
oxidized rubredoxin + NAD(P)H + H+ The 3 substrates of this enzyme are reduced rubredoxin, NAD+, and NADP+, whereas its 4 products are oxidized rubredoxin, NADH, NADPH, and H+. This enzyme belongs to the family of oxidoreductases, specifically those acting on iron-sulfur proteins as donor with NAD+ or NADP+ as acceptor. The systematic name of this enzyme class is rubredoxin:NAD(P)+ oxidoreductase. Other names in common use include rubredoxin-nicotinamide adenine dinucleotide (phosphate) reductase, rubredoxin-nicotinamide adenine, dinucleotide phosphate reductase, NAD(P)+-rubredoxin oxidoreductase, and NAD(P)H-rubredoxin oxidoreductase. This enzyme participates in fatty acid metabolism.
Sources: en.wikipedia.org
Adal's headquarters were again relocated the following century, this time southward to Harar. From this new capital, Adal organised an effective army led by Imam Ahmad ibn Ibrahim al-Ghazi, (Ahmad "Gurey" or "Gran"; both meaning "the left-handed") and his closest top general and brother in law Garad Matan. Imam Ahmed clan is documented to be from the Geri Koombe, a sub clan of Darod. This 16th-century campaign is historically known as the Conquest of Abyssinia (Futuh al-Habash). During the war, Imam Ahmad pioneered the use of cannons supplied by the Ottoman Empire, which he imported through Zeila and deployed against Abyssinian forces and their Portuguese allies led by Cristóvão da Gama.
=== Cultivation === Chili peppers are the shiny, brightly coloured fruits of species of Capsicum. Botanically they are berries. The plants are small, 20 to 60 centimetres (7.9 to 23.6 in) depending on variety, making them suitable for growing in pots, greenhouses, or commercially in polytunnels. The plants are perennial, provided they are protected from cold. The fruits can be green, orange, red, or purple, and vary in shape from round and knobbly to smooth and elongated. If the fruits are picked green and unripe, more flowers develop, yielding more fruit; fruits left on the plant can become hotter in taste, and acquire their ripe coloration, at the price of a reduced harvest. Ideal growing conditions for peppers include a sunny position with warm, loamy soil, ideally 21 to 29 °C (70 to 84 °F), that is moist but not waterlogged. The seeds germinate only when warm, close to 21 °C (70 °F). The plants prefer warm conditions, but can tolerate temperatures down to 12 °C (54 °F); and are sensitive to cold. The flowers can self-pollinate. However, at extremely high temperatures, 30 to 38 °C (86 to 100 °F), pollen loses viability, and its flowers are much less likely to result in fruit. For flowering, Capsicum is a non-photoperiod-sensitive crop. Chilies are vulnerable to pests including aphids, glasshouse red spider mite, and glasshouse whitefly, all of which feed on plant sap. Common diseases include grey mould caused by Botrytis cinerea; this rots the tissues and produces a brownish-grey mould on the surface.
=== Buccal administration === Progesterone has been studied for use by buccal administration. The medication has been marketed in the form of buccal tablets under the brand names Progesterone Lingusorbs, Lutocylol, Membrettes, and Syngestrets, although these products are no longer available. The clinical dosage of buccal progesterone has been described as 10 to 50 mg/day relative to 5 to 60 mg/day in the case of intramuscular injection.
Leucine or leucin (symbol Leu or L) is an essential amino acid that is used in the biosynthesis of proteins. Leucine is an α-amino acid, meaning it contains an α-amino group (which is in the protonated −NH3+ form under biological conditions), an α-carboxylic acid group (which is in the deprotonated −COO− form under biological conditions), and a side chain isobutyl group, making it a non-polar aliphatic amino acid. It is essential in humans (and animals), meaning the body cannot synthesize it; it must be obtained from the diet. Human dietary sources are foods that contain protein, such as meats, dairy products, soy products, and beans and other legumes. It is encoded by the codons UUA, UUG, CUU, CUC, CUA, and CUG. Leucine is named after the Greek word for 'white': λευκός (leukós 'white'), after its common appearance as a white powder, a property it shares with many other amino acids. Like valine and isoleucine, leucine is a branched-chain amino acid. The primary metabolic end products of leucine metabolism are acetyl-CoA and acetoacetate; consequently, it is one of the two exclusively ketogenic amino acids, with lysine being the other. It is the most important ketogenic amino acid in humans. Leucine and β-hydroxy β-methylbutyric acid, a minor leucine metabolite, exhibit pharmacological activity in humans and have been demonstrated to promote protein biosynthesis via the phosphorylation of the mechanistic target of rapamycin (mTOR).
Following Enoch Powell's Rivers of Blood speech Heseltine publicly urged Heath to deal firmly with him—to the consternation of many in his local party at Tavistock, where Powell enjoyed strong support. Three days later, Heseltine was one of around two dozen Conservative MPs who defied the whip to abstain rather than vote against the second reading of the 1968 Race Relations Bill (which banned racial discrimination). He argued that the Conservatives should state their own alternative policy rather than just oppose. Heseltine was promoted to principal opposition spokesman on transport in November 1969, although unlike his predecessors Thatcher and Walker, he was not a member of the Shadow Cabinet. He went on a six-week tour of India, Hong Kong, Singapore, Australia and the US to study how their docks were run, in readiness for Labour's planned 1970 Docks Bill (which in the event was cancelled because of that year's general election).
Sources: en.wikipedia.org
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.
The single bridge between two cysteine residues holds the chain in a folded loop that influences its shape and its behavior in solution. Loss of the bridge through reduction or oxidation shifts chromatographic retention and is tracked during stability work.
It is a defined 28-residue sequence derived from a larger precursor, whereas many other thymic preparations are mixtures of several polypeptides. Its acetylated amino terminus and single disulfide bridge distinguish it chemically from unrelated thymic extracts.
It is a chain of 28 amino acids, with an acetyl group attached to the first serine residue. The synthetic version replicates this sequence. Its molecular mass is about 3,108 daltons.