The short version of thymalfasin fits in a sentence. The long version — which is the one that helps — is below.
This page was last updated on 2025-09-24 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.
Lyophilized thymosin alpha 1 is typically stored refrigerated at 2 to 8 degrees Celsius and kept away from light. Reconstituted solutions are less stable and are usually used promptly after preparation. Repeated freeze-thaw cycles are avoided because they can promote aggregation and loss of activity. The peptide adsorbs to some plastic and glass surfaces, so a carrier protein is often added to dilute working solutions. Manufacturer instructions and published protocols both govern handling.
Identity and purity testing for thymosin alpha 1 relies mainly on reversed-phase high-performance liquid chromatography and mass spectrometry. Chromatography separates the parent peptide from truncated or modified variants, while mass spectrometry confirms the expected molecular mass. Amino acid analysis and peptide mapping provide additional sequence confirmation. Counterion content, water content, and residual solvents are measured separately as part of specification testing. No single method captures every attribute, so laboratories combine several techniques.
| 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 |
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.
Like most short peptides, thymosin alpha-1 is susceptible to hydrolysis under strongly acidic or basic conditions and to oxidation when exposed to air over long periods. The acetylated amino terminus blocks one common degradation route, which contributes to the molecule's relative robustness in solution. Lyophilized material generally retains potency for extended periods when kept cold and dry. Once reconstituted, aqueous solutions are less stable and are typically used within a defined window rather than held indefinitely at ambient temperature.
Routine handling calls for storage of the lyophilized powder at refrigerated temperatures, away from light, in a sealed container. Working solutions are often prepared in sterile water or buffer and kept cold between uses. Repeated freeze-thaw cycles are generally avoided because they can promote aggregation and loss of material. Laboratories usually record lot number, reconstitution date, and storage conditions so that any change in behavior can be traced to a specific preparation.
Reverse-phase high-performance liquid chromatography is the standard technique for assessing purity and concentration, because the peptide's hydrophobicity allows clean separation from related impurities. Mass spectrometry confirms molecular identity and detects sequence errors or truncations. Amino acid analysis and peptide mapping supply additional structural confirmation when required. Chromatographic purity values reported on certificates of analysis describe the proportion of the main peak and do not by themselves establish biological activity.
Algicidal bacteria are a diverse group of bacteria that either directly or indirectly inhibit the growth of algae. They play a key role in maintaining ecological stability in fresh water and marine environments by mitigating the negative effects of harmful algal blooms (HAB). Algicidal bacteria interactions with algal cells can be broadly split into two categories: direct and indirect. Direct methods typically involve the algicidal bacteria physically attacking the algal cell to induce cell lysis. Indirect methods of attack by algicidal bacteria typically involve releasing algae inhibiting chemicals into the surrounding water. Algicidal bacteria can detect targeted algal cells via chemotaxis and quorum sensing. Different species of algicidal bacteria can have varying degrees of specificity and many have co-evolved along their target algae. Algicidal bacteria have been used as a biological control method against HABs. They tend to be more environmentally friendly than traditional algicides.
==== Japan ==== In Japanese cuisine, they are called harusame (春雨), literally "spring rain". Unlike Chinese glass noodles, they are usually made from potato starch. They are commonly used to make salads, or as an ingredient in hot pot dishes. They are also often used to make Japanese adaptations of Chinese and Korean dishes. Shirataki noodles are translucent, traditional Japanese noodles made from the konjac yam and sometimes tofu.
== Epidemiology == Kwashiorkor is rare in high-income countries. It is mostly observed in low-income and middle-income nations and regions such as Southeast Asia, Central America, Congo, Ethiopia, Puerto Rico, Jamaica, South Africa, and Uganda, where poverty is prominent. Occurrences of severe malnutrition also tend to trend higher under conditions of food insecurity, higher prevalence of infectious diseases, lack of access to appropriate care, and poor living situations with inadequate sanitation. Communities experiencing famine are affected the most, especially during the rainy season. Prevalence varies, but it affects children of either sex commonly under five years old. "Globally, kwashiorkor indirected accounted for 53% of deaths among children under five between 2000 and 2003 when associated with other common childhood diseases like acute respiratory infections, malaria, measles, HIV/AIDS and other causes of perinatal deaths." When compared to marasmus in developing countries, kwashiorkor typically has a lower prevalence, "0.2%-1.6% for kwashiorkor and 1.2%-6.8% for marasmus." Factors such as "diet, geographical locations, climate, and aflatoxin exposure" have been invoked as potential causes for observed differences in the prevalence of kwashiorkor and marasmus. In general, in areas where Severe Acute Malnutrition (SAM) is prevalent, marasmus is more often the dominant SAM condition. However, in certain areas, kwashiorkor may be more common than marasmus.
Sources: en.wikipedia.org
Histidine forms complexes with many metal ions. The imidazole sidechain of the histidine residue commonly serves as a ligand in metalloproteins. One example is the axial base attached to Fe in myoglobin and hemoglobin. Poly-histidine tags (of six or more consecutive H residues) are utilized for protein purification by binding to columns with nickel or cobalt, with micromolar affinity. Natural poly-histidine peptides, found in the venom of the viper Atheris squamigera have been shown to bind Zn(II), Ni(II) and Cu(II) and affect the function of venom metalloproteases. N-terminal histidines are known to function as bidentate ligands, with a metal (generally copper) bound to both the amine of the N-terminus and the Nδ of the histidine; the Nε is often methylated. Although recently discovered, this "histidine brace" motif is critical in biogeochemical cycles: it functions as the active site of lytic polysaccharide monooxygenases (LPMOs), which break down unreactive polysaccharides such as cellulose. It is proposed that the evolution of these enzymes in fungi corresponds to the first widespread ability to decompose woody plant mass, leading to the end of the Carboniferous era and its mass accumulation of coal deposits.
=== Epoxide stereochemistry === In targeting 10-epi-kedarcidin chromophore, Myers et al. sought to install the epoxide functionality syn to the adjacent C10 hydroxyl group. This was accomplished by vanadium-catalyzed epoxidation directed by the C10 hydroxyl group. Had the natural C10-(S)-epimer been desired, it is conceivable that trialkylsilyl protection of the C10 hydroxyl would lead to the desired α-face epoxidation product by steric occlusion of the β face of the olefin; however, without a directing group to accelerate the oxidation of a proximal alkene, this hypothetical reaction would likely suffer from poor regioselectivity, as oxidation of other C–C unsaturations in the molecule would compete with the desired reaction.
=== Recurring or guest === Avantika Vandanapu as Ophelia, a young advanced witch Madelaine Petsch as Kira, Ben's girlfriend Elle Chapman as Ashley, one of Kira's friends Berto Colón as Joe the Doorman Fedor Steer as Mr. Nas, an elderly gentleman being cared for by Constance and Ben John Waters as Mr. Phibes, a mysterious phlebotomist John Carroll Lynch as Twisty the Clown, a disgraced clown and a serial killer, reprising his role from Freak Show and Cult Tig Notaro as Ricochet, a clown school teacher Jamie Brewer as: Adelaide Langdon, Constance's daughter, reprising her role from Murder House Nan, a witch, reprising her role from Coven and Apocalypse Mena Suvari as Elizabeth Short, a ghost of an aspiring actress, reprising her role from Murder House and Apocalypse Paul Anthony Kelly as young Nas Mat Fraser as Paul the Illustrated Seal, a freak show member with phocomelia, reprising his role from Freak Show Orlando Jones as Papa Legba, a gatekeeper of the spirit world; Jones replaces Lance Reddick, who portrayed Papa Legba in Coven and Apocalypse Seth Gabel as Jeffrey Dahmer, a serial killer, reprising his role from Hotel Zach Villa as Richard Ramirez, a serial killer, reprising his role from 1984 Alex Consani as Morwenna Grace Dumdaw Cara Delevingne Charlie Carver
== See also == Methane Isotope Carbon isotopes Hydrogen isotopes Isotopic signature Isotope geochemistry Isotopologue Isotopomer Clumped isotopes Isotope-ratio mass spectrometry Hydrogen isotope geochemistry of natural gas Methanogenesis Kinetic isotope effect
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.
The lyophilized powder is kept refrigerated at 2 to 8 degrees Celsius and protected from light. Reconstituted solutions should be used promptly. Freezing and thawing repeatedly is avoided.