Everything below concerns chronic hepatitis B. We keep the language plain, cite what the science says, and separate well-supported claims from open questions.
Last reviewed on 2026-04-25. Where a claim depends on a specific study, the study is described rather than over-claimed.
The peptide was identified during work in the 1970s on thymosin fraction 5, a partially purified extract of calf thymus. Investigators separated that mixture and characterized individual components, one of which they named thymosin alpha-1. The same compound later received the international nonproprietary name thymalfasin. Commercial material is produced by solid-phase peptide synthesis rather than by extraction, so synthetic and natural forms share an identical sequence. Naming conventions vary across the literature, and readers should distinguish the alpha-1 peptide from other thymosins that have unrelated sequences and functions.
Thymosin beta-4 is a separate 43-residue peptide that binds actin and participates in cell migration; it shares no sequence similarity with thymosin alpha-1 despite the common family name. Other preparative materials, such as thymosin fraction 5 and thymopoietin, contain distinct mixtures or peptides. The shared thymosin label reflects the tissue of origin used in early purification, not a common structural core. Treating these molecules as interchangeable is a frequent source of confusion in laboratory reports and in popular summaries alike.
Thymosin alpha-1 is a synthetic peptide of 28 amino acid residues that corresponds to a naturally occurring fragment first isolated from thymus tissue. Its chain is acetylated at the amino terminus, a modification that shields the peptide from rapid cleavage by aminopeptidases. The molecule carries a net negative charge at physiological pH and dissolves freely in water. Researchers classify it as an immune-modulating agent rather than a classical hormone, because it acts on several cell types of both the innate and the adaptive immune system.
Quantifying thymosin alpha-1 in a sample usually relies on reverse-phase high-performance liquid chromatography. The peptide lacks strong chromophores, so detection often occurs at 214 nm, where the peptide backbone absorbs. Mass spectrometry provides confirmatory identification and can detect sequence variants or truncations. Immunoassays have been used in biological matrices, but they may cross-react with related fragments. For purity assessment, chromatographic peak area gives the main component percentage, while mass accuracy verifies molecular identity.
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.
| Property | Value | Notes |
|---|---|---|
| Molecular mass | About 3.1 kDa | 28 residues, N-terminally acetylated |
| Appearance | White to off-white powder | Lyophilized solid |
| Solubility | Freely soluble in water | Also soluble in aqueous buffers |
| Storage temperature | 2 to 8 °C | Protect from light and moisture |
| Common synonyms | Thymalfasin; Tα1 | Same peptide sequence |
Thymosin alpha-1 is a synthetic 28-amino-acid peptide whose sequence was first identified in extracts of bovine thymus tissue during the 1970s. The chain carries an acetyl group on its N-terminal serine. Its acidic residue content is high, which produces strong water solubility and an isoelectric point well below neutrality. Material supplied for laboratory and clinical use is manufactured by solid-phase peptide synthesis rather than purified from animal tissue. Different salt forms, such as the acetate, alter the counter-ion content without changing the peptide backbone.
Whether the free 28-residue peptide circulates in human tissue remains debated. The best-documented human source is prothymosin alpha, a larger acidic protein that carries the sequence at its N-terminus. Reports of measurable peptide levels in serum and lymphoid tissue exist, yet some of that signal may come from cross-reacting fragments or from the parent protein. Most reviews therefore treat prothymosin alpha as the established human molecule and describe independent circulation of the small peptide as an unresolved question.
Immunological studies connect the peptide to multiple parts of the immune response. It has been reported to engage Toll-like receptor signaling, to promote dendritic cell maturation, and to influence the balance of T helper cell subsets. Changes in natural killer cell activity and in cytokine release appear in cell culture and animal models. These observations describe broad immunomodulatory behavior rather than a single defined receptor target, and the primary molecular interaction has not been settled.
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.
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.
Nihonium at The Periodic Table of Videos (University of Nottingham) Uut and Uup Add Their Atomic Mass to Periodic Table Archived 7 September 2006 at the Wayback Machine Discovery of Elements 113 and 115 Superheavy elements WebElements.com: Nihonium
Taco Bell Corporation, doing business as Taco Bell, is an American multinational chain of fast food restaurants founded in 1962 by Glen Bell (1923–2010) in Downey, California. Taco Bell is a subsidiary of Yum! Brands, Inc., who are also the owners of sister brand KFC. The restaurants serve a variety of Mexican-inspired foods, including tacos, burritos, quesadillas, nachos, novelty, and specialty items, and a variety of "value menu" items. As of 2023, Taco Bell serves over two billion customers each year, at 8,212 restaurants, more than 94 percent of which are owned and operated by independent franchisees and licensees. PepsiCo purchased Taco Bell in 1978. PepsiCo spun off its restaurants division in 1997 as Tricon Global Restaurants; 2002, it changed its name to Yum! Brands.
=== Early career === Early on as an independent investigator, Mrksich developed and executed the concept of dynamic substrates for cell culture. Here, self-assembled monolayers (SAMs) present cell adhesive ligands with perfect control over density and orientation against a non-adhesive, inert background, such as ethylene glycol. These monolayers can be further modified with electroactive groups that selectively release immobilized ligand when stimulated with an electric potential. Several strategies using this approach were studied in the context of cell signaling, migration, and co-culture. Subsequent cell-based work focused on developing methods to pattern cells on the aforementioned SAMs. The work has mostly utilized microcontact printing to confine adherent cells into defined positions, shapes, and sizes. Ultimately, his group's work has revealed examples of how cellular mechanics and cytoskeletal structure influence phenotype. A primary example of this involved investigating how cell shape exerts control over the differentiation of mesenchymal stem cells. Further work utilized these patterned monolayers to investigate the relationship between various cytoskeletal elements and to observe complex phenotypic differences in patient-derived neuroprogenitor cells. Recent work in the group investigating cell patterning has utilized photoactive adhesive peptides, allowing for local, spatiotemporal control of cell adhesion to study gap junction formation.
Sources: en.wikipedia.org
Etymology The term poultice comes from the Latin puls or pultēs, meaning "porridge" or "thick pap," through Middle English pultes. This reflects the traditional preparation of poultices as soft, moist masses resembling porridge. Ancient use Poultices have been documented in many ancient medical traditions, including Egypt, Mesopotamia, India, Greece, and Rome. They were usually made from plants, animal products, or minerals, and applied directly to the skin to reduce pain, inflammation, or infection.
In the case of chain-end scission, monomers are released and this process is referred to as unzipping or depolymerization. Which mechanism dominates will depend on the type of polymer and temperature; in general, polymers with no or a single small substituent in the repeat unit will decompose via random-chain scission. The sorting of polymer waste for recycling purposes may be facilitated by the use of the resin identification codes developed by the Society of the Plastics Industry to identify the type of plastic.
Calcium alginate is used in different types of medical products, including skin wound dressings, in the form of hydrogels, to promote healing, since alginate can increase the fluid uptake capacity of dressings, reducing the amount of times the dressing needs to be changed.
Sources: en.wikipedia.org
== Structure == Niosomes are microscopic lamellar structures formed by non-ionic surfactants and cholesterol. They exhibit a bilayer structure, with hydrophilic ends facing outward and hydrophobic ends facing inward. Their unique structure makes them ideal for diverse applications, notably in drug delivery systems. Niosomes excel in encapsulating both hydrophilic and hydrophobic drugs, enhancing drug stability and bioavailability. They are adaptable for tailored drug release and have garnered interest across pharmaceuticals, cosmetics, and agriculture for their biocompatibility and versatile properties.
An automated synthesis is very similar in procedure to performing a manual synthesis. The overseeing chemist decides on a target molecule then formulates the experimental plan, which is a sequential series of steps. Then, they collect the required equipment and execute the plan. The automated synthesis follows the same pathway, except that the computer devises and executes the experimental plan. However, human revision is usually still required to ensure the automated route is practical and there are no implicit steps or conditions missing from the proposed procedure. In organic synthesis, organic synthesis software is used to automate the process of identifying sequences of reactions or routes that can be used to synthesize organic compounds.
=== 2022–2023: Self-Harm & Me and The GC's Big Night Out === In February 2022, Collins fronted a documentary on Channel 4 titled Gemma Collins: Self-Harm & Me. The documentary followed Collins as she opened up for the first time about her personal relationship with self-harm and saw her speak to experts as they investigated what was behind the rise in cases of self-harm in the United Kingdom. It received positive reviews and Collins was credited for raising the subject of self-harm and for showing audiences a different side to her. It was subsequently nominated within the Authored Documentary category at the 27th National Television Awards. Collins said she was "blown away" by the nomination, reflecting that "it was the scariest thing to be so honest with [herself], however the response [she] got from the show was totally overwhelming. In March 2022, Collins visited her former school Frances Bardsley Academy for Girls, as part of BBC 100's Share Your Story in which various celebrities returned to their old schools to share their experiences and inspire pupils.
The maximum recommended daily dose is 10 milligrams per day. Overdoses of alprazolam can be mild to severe depending on the quantity ingested and if other drugs are taken in combination. Alprazolam overdoses cause excess central nervous system (CNS) depression.
Sources: en.wikipedia.org
It is a 28-residue synthetic peptide studied as an immune-modulating agent and approved as a drug in some countries. The sequence matches a naturally occurring fragment isolated from thymus tissue. It is not a hormone in the endocrine sense.
The name traces back to thymosin fraction 5, a crude thymus extract examined in the 1970s. Individual peptides in that mixture were labeled with Greek letters, and alpha-1 was one of them. The international nonproprietary name thymalfasin was assigned later.
No. Thymosin beta-4 contains 43 residues and binds actin, while thymosin alpha-1 contains 28 residues and acts on immune cells. The two sit in a historical naming group but share no sequence similarity, and they are not substitutes for one another.
Reverse-phase HPLC with ultraviolet detection at 214 nm is common. Mass spectrometry is used to confirm molecular identity and detect modifications. Immunoassays exist but may not distinguish the intact peptide from fragments.