If you have been reading about thymic extract 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.
Last reviewed on 2026-02-10. Where a claim depends on a specific study, the study is described rather than over-claimed.
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.
Recommended storage for the dry powder is a freezer near minus twenty degrees Celsius, kept desiccated and away from light. Once dissolved, the peptide is less stable and is usually held at two to eight degrees Celsius for short intervals or frozen for longer storage. Stability studies focus on the acetylated terminus and the disulfide linkage because those features define the intact molecule. Common degradation routes include cysteine oxidation, deamidation of asparagine or glutamine side chains, and slow formation of higher-molecular-weight species.
Identity and purity are usually checked by reverse-phase high-performance liquid chromatography, which separates the intact chain from truncated products, together with mass spectrometry for confirmation of the expected mass. Peptide mapping after enzymatic digestion and amino acid analysis add sequence-level evidence. Release testing also covers water content, residual solvents, and counter-ions, all of which influence measured mass and stability. Related-peptide limits are commonly expressed as a percentage of total peak area, with individual unspecified impurities held below a lower threshold.
| Property | Value | Notes |
|---|---|---|
| Molecular formula | C129H215N33O55 | Calculated for the acetylated 28-residue peptide |
| Appearance | White to off-white powder | Lyophilized solid recovered from aqueous buffer |
| Solubility | Freely soluble in water | Typically dissolved in water or buffer before use |
| Typical storage | -20 C or below, desiccated | Protect from light and avoid repeated freeze-thaw cycles |
| Identity testing | Reverse-phase HPLC with mass spectrometry | Retention time and measured mass confirm the sequence |
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.
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.
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.
A person's history of taking paracetamol is somewhat accurate for the diagnosis. The most effective way to diagnose poisoning is by obtaining a blood paracetamol level. A drug nomogram developed in 1975, called the Rumack–Matthew nomogram, estimates the risk of toxicity based on the serum concentration of paracetamol at a given number of hours after ingestion. To determine the risk of potential hepatotoxicity, the paracetamol level is traced along the nomogram. Use of a timed serum paracetamol level plotted on the nomogram appears to be the best marker indicating the potential for liver injury. A paracetamol level drawn in the first four hours after ingestion may underestimate the amount in the system because paracetamol may still be in the process of being absorbed from the gastrointestinal tract. Therefore, a serum level taken before 4 hours is not recommended. Clinical or biochemical evidence of liver toxicity may develop in one to four days, although, in severe cases, it may be evident in 12 hours. Right-upper-quadrant tenderness may be present and can aid in diagnosis. Laboratory studies may show evidence of liver necrosis with elevated AST, ALT, bilirubin, and prolonged coagulation times, particularly an elevated prothrombin time. After paracetamol overdose, when AST and ALT exceed 1000 IU/L, paracetamol-induced hepatotoxicity can be diagnosed. In some cases, the AST and ALT levels can exceed 10,000 IU/L.
== Further reading == Foreman, John C.; Johansen, Torben; Gibb, Alasdair J., eds. (2010). Textbook of Receptor Pharmacology. doi:10.1201/9781420052558. ISBN 978-0-429-14730-2. Brunton L (2011). Brunton LL, Chabner B, Knollmann BC (eds.). Goodman and Gilman's The Pharmacological Basis of Therapeutics (12 ed.). New York: McGraw-Hill. ISBN 978-0-07-162442-8. Whalen K (2014). Lippincott Illustrated Reviews: Pharmacology.
At the end of the meet, the Texas Longhorns took second while 2007's champion, the Auburn Tigers, took fifth. For the women, Arizona worked on the disappointment of 2007's defeat. The women were winning until the last day when Auburn grasped the title. Unlike 2007, Arizona's women did not let anyone come close. The Wildcats won with 484 team points while the Auburn Tigers came in second with 348 and the Stanford Cardinal in third with 343. Student-athletes from the women's swimming and diving team have been particularly heralded by the NCAA. The NCAA Woman of the Year Award was won by UA swimmers Whitney Myers, Lacey Nymeyer and Justine Schluntz in 2007, 2009 and 2010 respectively. The three awards and the 1994 award won by track and field athlete Tanya Hughes are the highest number of Woman of the Year awards won by a single university.
=== Physiologically based Pharmacokinetics === Physiologically-Based Pharmacokinetic models integrate physiological information to simulate drug behavior in various tissues and organs. These models consider organ-specific blood flow, tissue permeability, and drug properties, facilitating predictions of drug concentration at specific sites. PBPK models are instrumental in understanding complex drug behaviors.
Sources: en.wikipedia.org
Taco Bell opened its first Malaysian store in Cyberjaya, Sepang on April 2, 2021. It then opened its second store in Bandar Sri Permaisuri, Kuala Lumpur followed by Tropicana Gardens Mall and Setiawangsa outlets. In early 2022, Taco Bell opened up in Wangsa Maju, Sunway Pyramid, Puchong and has continued in expanding to other states as well. It currently has 13 stores scattered across Klang Valley.
In the field of cell biology, TNF-related apoptosis-inducing ligand (TRAIL), is a protein functioning as a ligand that induces the process of cell death called apoptosis. TRAIL is a cytokine that is produced and secreted by most normal tissue cells. It causes apoptosis primarily in tumor cells, by binding to certain death receptors. TRAIL and its receptors have been used as the targets of several anti-cancer therapeutics since the mid-1990s, such as Mapatumumab. However, as of 2013, these have not shown significant survival benefit. TRAIL has also been implicated as a pathogenic or protective factor in various pulmonary diseases, particularly pulmonary arterial hypertension. TRAIL has also been designated CD253 (cluster of differentiation 253) and TNFSF10 (tumor necrosis factor (ligand) superfamily, member 10).
In 1869 Dmitrii Mendeleev reported that when he arranged the elements in a row according to their atomic weights, there was a certain periodicity to them. For instance, the second element, lithium, had similar properties to the ninth element, sodium, and the sixteenth element, potassium — a period of seven. Likewise, beryllium, magnesium, and calcium were similar and all were seven places apart from each other on Mendeleev's table. Using these patterns, Mendeleev predicted the existence and properties of new elements, which were later discovered in nature: scandium, gallium, and germanium. Moreover, the periodic table could predict how many atoms of other elements that an atom could bond with — e.g., germanium and carbon are in the same group on the table and their atoms both combine with two oxygen atoms each (GeO2 and CO2). Mendeleev found these patterns validated atomic theory because it showed that the elements could be categorized by their atomic weight. Inserting a new element into the middle of a period would break the parallel between that period and the next, and would also violate Dalton's law of multiple proportions.
Sources: en.wikipedia.org
=== Bi–Bo === Klaus Biemann (1926–2016). Austrian chemist at MIT, the "father of organic mass spectrometry" and particularly noted for his role in advancing protein sequencing with tandem mass spectrometry. Member Natl. Acad. Sci. USA. Ethel Ronzoni Bishop (1890–1975). American biochemist and physiologist at Washington University in St. Louis who studied carbohydrate metabolism. Pamela J. Bjorkman (b. 1956). American biochemist at Caltech, who studies immune recognition of viral pathogens. Member Natl. Acad. Sci. USA. Elizabeth Blackburn AC FRS FAA FRSN (b. 1948). Australian-American biochemist, Nobel Laureate, co-discoverer of telomerase. Konrad Emil Bloch FRS (1912–2000). German-American biochemist at Harvard, who worked on the mechanism and regulation of cholesterol and fatty acid metabolism. Nobel Prize in Physiology or Medicine 1964. Elkan Blout (1919–2006). American biochemist at Harvard, who worked on peptide structure and conformation, including cyclic peptides. Member Natl. Acad. Sci. USA. David Mervyn Blow FRS (1931–2004). British X-ray crystallographer at Imperial College London, who worked on protein structure. Tom Blundell, FRS (b. 1942). British biochemist at the University of Cambridge, structural biologist, and science administrator. Aaron Bodansky (1887–1960). Russian-born American biochemist at the Hospital for Joint Diseases, New York, specializing in the area of calcium metabolism. Paul D. Boyer (1918–2018). American biochemist, at UCLA who studied ATP synthase. Nobel Prize in Chemistry in 1997. Member Natl. Acad. Sci. USA.
Khloé Alexandra Kardashian (; born June 27, 1984) is an American media personality, socialite, and businesswoman. She rose to fame starring with her family in the reality television series Keeping Up with the Kardashians from 2007 to 2021. Its success led to the creation of spin-offs, including Kourtney and Khloé Take Miami (2009–2013) and Kourtney and Khloé Take The Hamptons (2014–2015). Following the ending of their previous show, she and her family began starring on Hulu's The Kardashians in 2022. From September 2009 to December 2016, Kardashian was married to basketball player Lamar Odom, whom she married one month after they first met. They starred in their own reality television series, Khloé & Lamar (2011–2012). In 2009, Kardashian participated in the second season of The Celebrity Apprentice, finishing 10th of 16 candidates after being fired by Donald Trump. In 2012, she co-hosted the second season of the American adaptation of The X Factor with actor Mario Lopez. In 2016, Kardashian hosted her own talk show, Kocktails with Khloé. She starred in and produced health and fitness docu-series Revenge Body with Khloé Kardashian from 2017 to 2019. In 2025, she began hosting her own weekly podcast called Khloe in Wonderland. Kardashian has been involved in the retail and fashion industries with her sisters Kourtney and Kim. They have launched several clothing collections and fragrances, and additionally released the book Kardashian Konfidential in 2010. The Dash boutique employees starred in their own short-lived reality television series, Dash Dolls (2015).
=== Use of methylene chloride === Merck & Co. once used methylene chloride, a "priority pollutant" on the United States Environmental Protection Agency's list of pollutants and an animal carcinogen. It was used as a solvent in the manufacturing process for imipenem, an ingredient of the antibiotic Primaxin. Merck chemists and engineers subsequently replaced the compound with others having fewer negative environmental effects. Merck has also modified its equipment to provide greater control over its manufacturing process. Biological oxygen demand was reduced by 75%.
== Non-medical hormonal interventions == In addition to the use of medication to produce tumor-suppressing endocrine alterations, destruction of endocrine organs through surgery or radiation therapy are also possible. Surgical castration, or removal of the testes in males and ovaries in females, have been widely used in the past to treat hormone-responsive prostate cancer and breast cancer respectively. However, these invasive methods have been widely supplanted by the use of GnRH agonists, and other forms of pharmacologic castration. There are still situations in which surgical castration may be beneficial such as in special cases for women with high risk BRCA mutations.
Sources: en.wikipedia.org
It is a 28-amino-acid peptide originally purified from a bovine thymic extract and later produced synthetically. It is studied mainly for its effects on immune cell function.
No. The two peptides share part of a name but differ in length, sequence, and net charge. Literature searches that treat them as one compound return misleading results.
Solid-phase peptide synthesis is the usual route, and recombinant expression has also been described. Both approaches produce material matching the natural sequence.
Reconstituted solutions are typically kept refrigerated at two to eight degrees Celsius when used within a short window, or frozen in aliquots for longer periods. Repeated freeze-thaw cycles are avoided because they can reduce recovery of intact peptide.