The short version of immunomodulator fits in a sentence. The long version — which is the one that helps — is below.
Reviewed 2026-02-09. 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.
Identity and purity are assessed mainly by reversed-phase high-performance liquid chromatography, which separates the peptide from closely related impurities and from truncated or oxidized variants. Mass spectrometry supplies the molecular mass and confirms the expected sequence length, while amino acid analysis can be used to check composition. Because the molecule has no chromophore beyond the peptide backbone, ultraviolet detection is typically performed at a low wavelength, where baseline interference from solvents and buffers is a practical concern. Water content and counter-ion content are often reported alongside purity.
Practical handling focuses on limiting adsorption and contamination. The peptide dissolves readily in water, and dilute solutions tend to adhere to plastic and glass surfaces, so an inert carrier protein or a defined buffer can reduce losses in laboratory work. Workers also record the counter-ion form, since an acetate or trifluoroacetate salt changes the mass balance of the weighed powder. Documentation of lot number, purity value, and storage history supports reproducibility when results from different laboratories are compared.
| 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 |
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.
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.
The lyophilized peptide is a white to off-white powder that dissolves freely in water and in aqueous buffers near neutral pH. Because the molecule carries a net negative charge under physiological conditions, saline and phosphate solutions are the usual vehicles, while strongly acidic media are avoided. Stock solutions are commonly divided into small aliquots so that repeated freezing and thawing can be limited, since cycling may encourage aggregation. Solubility in organic solvents is poor and those solvents are seldom used as primary diluents.
The ability of a drug or other substance to be absorbed and used by the body. Orally bioavailable means that a drug or other substance that is taken by mouth can be absorbed and used by the body. (NCI) Bioinformatics
=== Founding the Respect Party === Galloway wrote in an article for The Guardian at the end of October 2003 that he would soon be part of a coalition consisting of the "red, green, anti-war, Muslim and other social constituencies radicalised by the war." In January 2004, it emerged that Galloway would be working with the Socialist Workers Party in England and Wales, and others, under the name Respect – The Unity Coalition, generally referred to simply as "Respect". In the opinion of Nick Cohen of The Observer it was an "alliance ... between the Trotskyist far left and the Islamic far right." Galloway announced in December 2003 that he would not force a by-election and did not intend to contest the next general election in Glasgow. His Glasgow Kelvin seat was to be split between three constituencies for the next general election. In one of these, the new Glasgow Central constituency, Mohammad Sarwar, the first Muslim Labour MP, wanted to be selected as the candidate. Galloway chose not to challenge him, announcing this decision at the end of May 2004 in his Mail on Sunday column.
During Bukele's presidential campaign, he promised to bring an end to gang violence in El Salvador; El Salvador was considered one of the world's most dangerous countries due to its gang violence. Most of El Salvador's violent crimes were committed by MS-13 and the 18th Street gang (Barrio 18). Although they are El Salvador's largest gangs, both originated in Los Angeles. MS-13 was formed in the 1980s by Salvadoran refugees fleeing El Salvador's civil war. The 18th Street gang was formed in the 1960s by Mexican immigrants. Much of the gang violence stemmed from income inequality, poverty, poor schools, a lack of job opportunities, and high urbanization. El Salvador's homicide rate peaked at 107 homicides per 100,000 people in 2015. El Salvador's homicide rate had decreased to 38 homicides per 100,000 people by 2019, still one of the world's highest. Gangs controlled parts of El Salvador, and ordered business owners to pay renta (extortion) for protection or face violence. In early 2019, there were an estimated 67,000 gang members in El Salvador. During his presidency, Bukele enacted tough-on-crime policies that scholars have characterized as successfully reducing gang activity and violent crime, at the cost of arbitrary arrest and alleged widespread human rights abuses.
=== Dog === Dog is a hulking gorilla-like robot belonging to Alyx Vance, built by her father Eli to provide both companionship and protection. Alyx subsequently upgraded the robot into its current form. Despite its name, Dog is anthropomorphic in appearance. Dog provides support to Freeman during training with the Gravity Gun, and makes appearances several times after.
Sources: en.wikipedia.org
==== Initial outbreak ==== In December 2019, an outbreak of coronavirus disease 2019 (COVID-19) was first identified in Wuhan, Hubei, China; it spread worldwide and was recognized as a pandemic by the World Health Organization (WHO) on March 11, 2020. The first confirmed case in Canada was in Ontario—reported on January 27, 2020. On March 17, Ford declared a state of emergency in Ontario, closing bars and restaurants (with the exception of take-out and delivery services), as well as libraries, theatres, cinemas, schools and daycares and all public gatherings of more than 50 people (later reduced to 5 people on March 28). Furthermore, the government announced on March 17 that Ontario had "some evidence of community transmission" of COVID-19. On March 23, Ford announced that all "non-essential" businesses would be ordered closed starting 11:59 p.m. On March 24. Ford also stated that schools would remain closed past the original April 6 opening date (on May 19 it was announced that schools would remain closed until the following school year in September). A list of 74 "essential" businesses was published later in the day on March 23. On March 25, Ford and Finance Minister Rod Phillips introduced a $17-billion response package that includes an influx of cash for the health sector, direct payments to parents and tax breaks for businesses.
== See also == List of cancer hospitals National Cancer Institute – U.S. health institute National Comprehensive Cancer Network – Non-profit organization in the U.S. Oncology – Branch of medicine dealing with, or specializing in, cancer
DCC (acronym for N,N'-dicyclohexylcarbodiimide) was one of the first carbodiimides developed as a reagent. It is widely used for amide and ester formation, especially for solid-phase synthesis of peptides. DCC has achieved popularity mainly because of its high-yielding amide coupling reactions and the fact that it is quite inexpensive. However, DCC does have some serious drawbacks, and its use is often avoided for several reasons:
Opium has been actively collected since approximately 3400 BC. Ancient alabaster residue reveals deliberate opium use in Egypt, suggesting royal tombs may have contained valuable narcotics prized by pharaohs. At least 17 finds of Papaver somniferum from Neolithic settlements have been reported throughout Switzerland, Germany, and Spain, including the placement of large numbers of poppy seed capsules at a burial site (the Cueva de los Murciélagos, or "Bat Cave", in Spain), which has been carbon-14 dated to 4200 BC. Numerous finds of P. somniferum or P. setigerum from Bronze Age and Iron Age settlements have also been reported. The first known cultivation of opium poppies was in Mesopotamia, approximately 3400 BCE, by Sumerians, who called the plant hul gil, the "joy plant". Tablets found at Nippur, a Sumerian spiritual center south of Baghdad, described the collection of poppy juice in the morning and its use in production of opium. Cultivation continued in the Middle East by the Assyrians, who also collected poppy juice in the morning after scoring the pods with an iron scoop; they called the juice aratpa-pal, possibly the root of Papaver. Opium production continued under the Babylonians and Egyptians. Opium was used with poison hemlock to put people quickly and painlessly to death. It was also used in medicine. Spongia somnifera, sponges soaked in opium, were used during surgery. The Egyptians cultivated opium thebaicum in famous poppy fields around 1300 BC.
Joe Fitzpatrick announces that he will not stand for re-election to the Scottish Parliament seat of Dundee City West at the 2026 Scottish Parliament election. 31 January – First Minister of Wales Eluned Morgan confirms she will contest the new seat of Ceredigion Penfro at the 2026 Senedd 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.
Cool storage below freezing is usual for long-term retention, with a desiccant and protection from light. Portions are often split before first use to avoid repeated handling.