The short version of immunomodulator fits in a sentence. The long version — which is the one that helps — is below.
This page was last updated on 2026-07-18 and is reviewed periodically as new material appears.
The compound has been investigated as an adjunct in chronic viral hepatitis and as a vaccine adjuvant, with results that vary by study design and population. Regulators in some countries have approved a synthetic form for specific indications, while other agencies have not. Whether the peptide produces consistent clinical benefit across diverse patient groups is still an open question, and many trials have been small. Its status is therefore best described as investigational in many contexts and established only narrowly.
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.
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.
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.
| 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 |
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.
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.
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.
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.
Quality control for thymosin alpha-1 focuses on identity, purity, and potency. Identity is confirmed by mass spectrometry and amino acid analysis, while purity is assessed by chromatography with limits on related substances and residual solvents. Potency assays may use cell-based immune readouts, but these are not standardized across laboratories. Regulatory status differs by jurisdiction; no product is approved in the United States for clinical use, whereas some other countries register injectable forms for specific indications.
Yeast taxonomy includes classification of yeast species depending on the presence or absence of a sexual phase. Therefore, some winemaking yeasts are classified by their asexual anamorph (or "imperfect" form) while others may be classified by their sexual teleomorph (or "perfect" form). A common example of this is Brettanomyces (or "Brett") that is usually referenced in wine and viticulture text under its asexual classification though some scientific and winemaking texts may describe specific species (such as Dekkera bruxellensis) under its sporulating sexual classification of Dekkera. Unless otherwise noted, this article will commonly refer to the asexual form of wine yeast. The most common yeast generally associated with winemaking is Saccharomyces cerevisiae which is also used in bread making and brewing. Other genera of yeast that can be involved in winemaking (either beneficially or as the cause of potential wine faults) include:
The name "alkaloids" (German: Alkaloide) was introduced in 1819 by German chemist Carl Friedrich Wilhelm Meissner, and is derived from late Latin root alkali and the Greek-language suffix -οειδής -('like'). However, the term came into wide use only after the publication of a review article, by Oscar Jacobsen in the chemical dictionary of Albert Ladenburg in the 1880s. The name "alkaloid" was introduced, since at the time, chemists conceptualized the category of "alkaline" in such a way that plants cannot produce alkaline. For instance, potash, an alkaline substance that can be extracted from plants by burning, was thought to be either produced during burning, or extracted by plant from the soil. Subsequent research by chemists to extract the "principle" (what we nowadays call the active ingredient) of medicinal plants, led to the discovery of various substances that had properties resembling alkalines as understood at the time. These substances were variously named "salifiable vegetable bases", "vegetable organic compounds", "organic bases", etc. After enough such substances were discovered, these substances were classified as "alkaloid", a new chemical category. There is no unique method for naming alkaloids. Many individual names are formed by adding the suffix "ine" to the species or genus name. For example, atropine is isolated from the plant Atropa belladonna; strychnine is obtained from the seed of the Strychnine tree (Strychnos nux-vomica L.).
John Lawrence, the Lord Mayor of London, ordered that the bodies of plague victims "...shall be at least six foot deep." The city officials apparently believed this would inhibit the spread of the disease, not realising that the true vector was fleas living on rats in the streets. In the event, there were so many victims that very few were buried in individual graves. Most were placed in massive plague pits so it is unlikely that this event alone gave rise to the "six feet" tradition.
=== Aversion therapy === Aversion therapy in alcoholism had its roots in Russia in the early 1930s, with early papers by Pavlov, Galant and Sluchevsky and Friken, and would remain a strain in the Soviet treatment of alcoholism well into the 1980s. In the US a particularly notable devotee was Dr Voegtlin, who attempted aversion therapy using apomorphine in the mid to late 1930s. However, he found apomorphine less able to induce negative feelings in his subjects than the stronger and more unpleasant emetic emetine.
Sources: en.wikipedia.org
In floating aquatic angiosperms, the leaves have evolved to only have stomata on the top surface to make use of atmospheric carbon dioxide. Gas exchange primarily occurs through the top surface of the leaf due to the position of the stomata, and the stomata are in a permanently open state. Due to their aquatic surroundings, the plants are not at risk of losing water through the stomata and therefore face no risk of dehydration. For carbon fixation, some aquatic angiosperms are able to uptake CO2 from bicarbonate in the water, a trait that does not exist in terrestrial plants. Angiosperms that use HCO3- can keep CO2 levels satisfactory, even in basic environments with low carbon levels. The many possible classifications of aquatic plants are based upon morphology.
biomolecule Also biological molecule. Any molecule or chemical compound involved in or essential to one or more biological processes within a biological system, especially large macromolecules such as proteins, nucleic acids, lipids, and carbohydrates, but also broadly inclusive of smaller molecules such as vitamins, hormones, and biometals which are consumed or produced by biochemical reactions, often as part of biochemical pathways. Most biomolecules are organic compounds; some are produced naturally within cells or tissues (endogenous compounds), while others can only be obtained from the organism's environment (exogenous compounds).
These Labour governments renationalised steel (British Steel) in 1967 after the Conservatives had privatised it and nationalised car production (British Leyland) in 1976. The 1945–1951 Labour government also established National Health Service which provided taxpayer-funded health care to Every British citizen, free at the point of use. High-quality housing for the working class was provided in council housing estates and university education became available to every citizen via a school grant system. The 1945–1951 Labour government has been described as being transformative democratic socialist.
Sources: en.wikipedia.org
Firm tofu (called 老豆腐 lǎodòufu in Chinese; 木綿豆腐, momen-dōfu in Japanese, "cotton tofu"; 모두부, mo-dubu in Korean): Although drained and pressed, this form of fresh tofu retains a high moisture content. It has the firmness of raw meat and bounces back readily when pressed. The texture of the inside of the tofu is similar to that of a firm custard. The skin of this form of tofu retains the pattern of the muslin used to drain it, and the outside is slightly more resistant to damage than the inside. It can be picked up easily with chopsticks. A very firm type of momen-dōfu is eaten in parts of Japan, called ishi-dōfu (石豆腐, "stone tofu") in parts of Ishikawa, or iwa-dōfu (岩豆腐, "rock tofu") in Gokayama in the Toyama Prefecture and in Iya in the prefecture of Tokushima. These types of firm tofu are produced with seawater instead of nigari (magnesium chloride), or using concentrated soy milk. Some of them are squeezed using heavy weights to eliminate excess moisture. These products are produced in areas where traveling is inconvenient, such as remote islands, mountain villages, and heavy snowfall areas.
==== Wood-based vanillin ==== 15% of the world's production of vanillin is produced from lignosulfonates, a byproduct from the manufacture of cellulose via the sulfite process. The sole remaining producer of wood-based vanillin is the company Borregaard located in Sarpsborg, Norway. For this kind of use, softwood is preferred because there are more guaiacyl units convertible to vanillin. Early production of wood-based vanillin involved four plants: a sulfite pulp mill, a fermentation plant, a vanillin plant, and a Kraft (sulfate) pulp mill. The sulfite mill provides the brown liquor to the fermentation plant, which makes use of the residual sugar. The spend liquor is sent to the vanillin plant, which uses alkaline oxidation with air at 160–170 °C and 10–12 atm pressure, toluene extraction, and back-extraction with NaOH to obtain a crude sodium vanillate. Addition of sulfurous acid affords easy separation of the soluble sulfide addition compound of vanillin from insoluble impurities such as acetovanillone. The vanillin is extracted, and the remaining liquor is sent to the Kraft mill for burning to recover energy and sodium sulfide, both important for a Kraft mill. This process went out of favor in North America due to the large amounts of caustic liquids that needs to be disposed by the mill at the end: 160 kg for every 1 kg of vanillin produced. The recovery of sodium sulfide also became less and less profitable as the sodium-to-sulfur ratio became more and more unbalanced. Borregaard is able to keep operating because it runs its own pulp mill.
== History and taxonomy == Harposporium anguillulae was described in the late 1800s as a parasite of nematodes. It has since been commonly reported in the literature. This fungus also traps eelworms. Harposporium anguillulae is one of 26 species in the genus Harposporium in the division Ascomycota. It is a pathogen of eelworms and nematodes, notable for its distinct sickle-shaped conidia that grow in pierce out through the host body. This genus Harposporium was treated initially in the Clavicipitaceae and is thought to be closely related to members of the genus, Tolypocladium. Both genera occur on nematodes and eelworms but rarely insects. The two genera can be differentiated morphologically, as members of the genus Tolypocladium produce more complex conidiophores with narrower conidiogenous cells.
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.