The short version of thymosin alpha 1 fits in a sentence. The long version — which is the one that helps — is below.
This page was last updated on 2026-06-28 and is reviewed periodically as new material appears.
Laboratory work indicates that the peptide acts on cells of both the innate and adaptive immune systems. Reported effects include signalling through Toll-like receptors on dendritic cells, enhanced T-cell maturation, and increased natural killer cell activity. These actions are described largely from cell-culture and animal experiments, and the precise receptor-level events remain incompletely defined. Studies in humans have generally measured immune markers rather than a single defined molecular target. The resulting picture remains partly descriptive.
Clinical research has examined the peptide in chronic hepatitis B and C, as a vaccine adjuvant, and in sepsis and oncology settings. Results across trials have been mixed, and several studies were small or conducted under differing protocols. Regulatory status varies by country, and the compound is not approved in every jurisdiction where it is studied. Evidence for any single indication should be read with attention to sample size and endpoint choice.
市售的胸腺素α1通常以冻干粉形式提供，溶解后用于注射。其氨基酸组成包括多个酸性残基，因此在中性pH下带负电荷。该肽可溶于水和生理盐水，但在有机溶剂中溶解度有限。储存条件通常为冻干状态下负20摄氏度，溶解后需冷藏并避免反复冻融。常见的同义词包括胸腺肽α1、thymalfasin和Tα1。
胸腺素α1（thymosin alpha 1，Tα1）是一种由28个氨基酸组成的酸性肽，N端被乙酰化，分子量约为3108道尔顿。该肽最早从牛胸腺组织提取物中分离，属于胸腺素组分5的一个成分。其序列在不同哺乳动物中高度保守，提示其具有基本的生物学功能。名称中的“α1”指其在电泳中的迁移位置，并非表示亚型编号。它既存在于胸腺，也存在于脾脏和淋巴结等免疫组织。
20世纪70年代，研究者从胸腺提取物中纯化出多种小肽，Tα1是其中被较早表征的一种。最初的制备依赖组织匀浆和层析步骤，产量低且成分复杂。随着固相肽合成技术成熟，实验室和工业界能够生产与天然序列一致的合成版本。合成肽的纯度可达95%以上，并可通过反相高效液相色谱和质谱进行鉴定。这一转变使研究不再依赖动物胸腺来源。
| Property | Value | Notes |
|---|---|---|
| Chemical class | Peptide | 28 amino acid residues |
| Molecular weight | Approximately 3108 Da | Depends on acetylation state |
| N-terminal modification | Acetylated | Affects charge and stability |
| Natural source | Fragment of thymosin beta-4 | Cleaved in vivo |
| Sequence length | 28 residues | Synthetic form matches natural |
Biologically, the peptide is studied mainly in the context of immune cell development and regulation. It is produced in the thymus and in several other tissues, and it appears to influence the maturation and activity of T cells and other immune populations. Laboratory work describes effects on cytokine production, on the balance between T cell subsets, and on the function of dendritic cells. Much of this evidence comes from cell culture and animal models, so the extent to which the same pathways operate in humans remains an open question.
Clinical interest has centered on chronic viral hepatitis, on immune restoration in various conditions, and on use as an adjuvant intended to improve responses to vaccines. Trials have reported mixed results, and regulatory status differs sharply between countries; in some places it is a prescription product, while elsewhere it is sold without an approved therapeutic indication. Because published studies vary widely in design, population, and endpoints, comparisons across them are difficult and no single conclusion covers the whole literature.
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.
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.
=== Britain, Australia, and New Zealand === Lamb A young sheep which is less than one year old. From 1 July 2019, the Australian definition is "an ovine animal that: (a) is under 12 months of age, or (b) does not have any permanent incisor teeth in wear". This new definition meant that Australian farmers could extend the term "lamb" by another month. This followed a similar definition change in New Zealand in 2018. In Britain the definition is still "0 permanent incisor teeth". A permanent incisor tooth is said to be "in wear" if it protrudes further than the nearest milk teeth. Hogget A sheep of either sex having no more than two permanent incisors in wear. The term is also used to refer to meat from the aforementioned animal. In the UK, it means animals that are 11 to 24 months old, while Australian butchers use the term for animals that are 13 to 24 months old. Still common in farming usage and among speciality butchers, it is now a rare term in British, Australian and New Zealand supermarkets, where meat of all sheep less than two years old tends to be called "lamb". Mutton The meat of a female (ewe) or castrated male (wether) sheep having more than two permanent incisors in wear.
PAHs may be abundant in the universe. They seem to have been formed as early as a couple of billion years after the Big Bang, and are associated with new stars and exoplanets. More than 20% of the carbon in the universe may be associated with PAHs. PAHs are considered possible starting material for the earliest forms of life. Light emitted by the Red Rectangle Nebula possesses spectral signatures that suggest the presence of anthracene and pyrene. This report was considered a controversial hypothesis that as nebulae of the same type as the Red Rectangle approach the ends of their lives, convection currents cause carbon and hydrogen in the nebulae's cores to get caught in stellar winds, and radiate outward. As they cool, the atoms supposedly bond to each other in various ways and eventually form particles of a million or more atoms. Adolf Witt and his team inferred that PAHs—which may have been vital in the formation of early life on Earth—can only originate in nebulae.
Dispase is a protease which cleaves fibronectin, collagen IV, and to a lesser extent collagen I. It is found in some bacteria and can be isolated from culture filtrates of Bacillus polymyxa. It can be extracted, purified, and used in research. It can be particularly useful to separate embryonic epithelia and mesenchyme. Dispase II is specific for the cleavage of leucine-phenylalanine bonds. Dispase is often used to digest adhering primary cells in culture, since this treatment turned out to be milder than trypsin digestion (Sinclair et al., 2013). A recent article also finds that dispase can digest serine-phenylalanine. Dispase intravitreal injection can be used in the modeling of proliferative vitreoretinopathy in different animals.
== Applications == Desalting is used to remove salts from protein solutions, phenol or unincorporated nucleotides from nucleic acids or excess crosslinking or labeling reagents from conjugated proteins. Buffer exchange is used to transfer a protein solution into a buffer system appropriate for downstream applications such as ion exchange, electrophoresis or affinity chromatography.
One method of introducing pores in silicon is through the use of an anodization cell. A possible anodization cell is made of Teflon and employs a platinum cathode and a crystalline Si wafer anode immersed in hydrogen fluoride (HF) electrolyte. Recently, inert diamond cathodes were used to avoid metallic impurities in the electrolyte and inert diamond anodes form an improved electrical back plate contact to the silicon wafers. Corrosion of the anode is produced by running electric current through the cell. It is noted that etching with constant DC is usually implemented to ensure steady tip-concentration of HF resulting in a more homogeneous porous layer, while pulsed current is more appropriate for the formation of thick PS layers with thickness greater than 50 μm. Pore direction is governed by crystal orientation. In (100)-cut Si the pores are oriented perpendicular to the wafer's surface. It was noted by Halimaoui that hydrogen evolution occurs during the formation of porous silicon.
Sources: en.wikipedia.org
Upon taking office in 2019, Newsom succeeded Brown as co-chair of the United States Climate Alliance. In September 2019, Newsom vetoed SB 1, which would have preserved environmental protections at the state level that were set to roll back nationally under the Trump administration's environmental policy. In February 2020, the Newsom administration sued federal agencies over the rollbacks to protect imperiled fish in the Sacramento–San Joaquin River Delta in 2019. Newsom attended the 2019 UN Climate Action Summit, where he spoke of California as a climate leader due to the actions of governors before him. In August 2020, he addressed the 2020 Democratic National Convention. His speech mentioned climate change and the wildfires prevalent in California at the time. On September 23, 2020, Newsom signed an executive order to phase out sales of gasoline-powered vehicles and require all new passenger vehicles sold in the state to be zero-emission by 2035. Bills he signed in September with an environmental focus included a commission to study lithium extraction around the Salton Sea. During his 2018 campaign, Newsom pledged to tighten state oversight of fracking and oil extraction. Early in his governorship, his administration approved new oil and gas leases on public lands at about twice the rate of the prior year. When asked about this development, Newsom said he was unaware of the rate of approvals, and he later fired the head of the Division of Oil, Gas and Geothermal Resources.
Hong Kong generates most of its electricity locally. The vast majority of this energy comes from fossil fuels, with 46% from coal and 47% from petroleum. The rest is from other imports, including nuclear energy generated in mainland China. Renewable sources account for a negligible amount of energy generated for the territory. Small-scale wind-power sources have been developed, and a small number of private homes and public buildings have installed solar panels. With few natural lakes and rivers, high population density, inaccessible groundwater sources, and extremely seasonal rainfall, the territory lacks a reliable freshwater supply. The Dong River in Guangdong supplies 70% of the city's water, with the remaining demand met by harvesting rainwater locally. Toilets in most built-up areas of the territory flush with seawater, which reduces freshwater use. Broadband Internet access is widely available, with 99.3% of households connected. Connections over fibre-optic infrastructure are increasingly prevalent, contributing to the high regional average connection speed of 21.9 Mbit/s (the world's fourth-fastest). Mobile-phone use is ubiquitous; there are almost 22 million mobile-phone accounts registered in Hong Kong, which is almost triple the territory's population.
Nondeletion forms: These defects, in general, involve a single base-pair substitution or small insertions near or upstream of the HBB gene. Deletion forms: base-pair deletions of different sizes involving the HBB gene produce syndromes such as hereditary persistence of fetal hemoglobin syndrome. Mutations are characterized as (βo) if they prevent any formation of β globin chains, and mutations are characterized as (β+) if they allow some β globin chain formation to occur.
== Carbohydrates as storage == Carbohydrates are typically stored as long polymers of glucose molecules with glycosidic bonds for structural support (e.g. chitin, cellulose) or for energy storage (e.g. glycogen, starch). However, the strong affinity of most carbohydrates for water makes storage of large quantities of carbohydrates inefficient due to the large molecular weight of the solvated water-carbohydrate complex. In most organisms, excess carbohydrates are regularly catabolised to form acetyl-CoA, which is a feed stock for the fatty acid synthesis pathway; fatty acids, triglycerides, and other lipids are commonly used for long-term energy storage. The hydrophobic character of lipids makes them a much more compact form of energy storage than hydrophilic carbohydrates. Gluconeogenesis permits glucose to be synthesized from various sources, including lipids. In some animals (such as termites) and some microorganisms (such as protists and bacteria), cellulose can be disassembled during digestion and absorbed as glucose.
Sources: en.wikipedia.org
== External links == "Paraxial Mesoderm: The Somites and Their Derivatives" at the National Center for Biotechnology Information "Somite Development" at McGill University Diagram at Lippincott Williams & Wilkins
Birmans have a medium-sized, rectangular body with a broad face and distinct Roman nose. Their ears are ideally as wide on the base as they are tall and should be set as much on top of the head as on the side. The eyes are rounded and should be a deep sapphire blue. The Birman's fur is medium-long and should have a silky texture. Unlike a Persian or Himalayan, they have no undercoat, thus are much less prone to matting. Coat colour is always pointed, save for the contrasting pure white, symmetrical "gloves" on each paw that are the trademark of the breed. The white must involve all toes and in front must stop at the articulation or at the transition of toes to metacarpals. These gloves should extend noticeably further up the back of the leg (referred to as the "laces"), finishing with an inverted V extended half to three-fourths up the hock. Any other spot of white on the points is considered a serious fault. The base body colour is white to cream, with a wash of colour that corresponds to the points, but is much paler. Recognized point colours are seal, chocolate, red and the corresponding dilute varieties: blue, lilac and cream. Tabby and tortie variations in seal, chocolate, blue or lilac are also allowed; other colours are in development.
As numerous ASSRs declared sovereignty and self-promotion to Soviet Socialist Republics, Art. 71 and 72 of the Constitution of the RSFSR were amended on May 24, 1991 to recognize its autonomous republics as SSRs; it was further amended on July 3 to promote all its autonomous oblasts other than Jewish Autonomous Oblast to SSRs. This decision came into conflict with Art. 85 of the Constitution of the USSR.
=== Immobilized metal ion affinity chromatography === Immobilized metal ion affinity chromatography (IMAC) is based on the specific coordinate covalent bond of amino acids, particularly histidine, to metals. This technique works by allowing proteins with an affinity for metal ions to be retained in a column containing immobilized metal ions, such as cobalt, nickel, or copper for the purification of histidine-containing proteins or peptides, iron, zinc or gallium for the purification of phosphorylated proteins or peptides. Many naturally occurring proteins do not have an affinity for metal ions, therefore recombinant DNA technology can be used to introduce such a protein tag into the relevant gene. Methods used to elute the protein of interest include changing the pH, or adding a competitive molecule, such as imidazole.
Coverage for people with obesity and at least one comorbidity like (elevated LDL-cholesterol, high blood pressure and/or MASLD), will be implemented as early as 1 April 2026. The cost will be significantly higher to taxpayers due to the fact that most insurance companies do not cover it in their formulary. Prior to this change, most Medicaid and CHIP patients only paid $3 a month, the same price for brand-name medication. In May 2026, Amazon Pharmacy announced that it would provide same‑day prescription delivery for the Ozempic pill, used to treat type 2 diabetes.
Sources: en.wikipedia.org
It corresponds to the first 28 amino acids of thymosin beta-4, a larger protein found in many tissues. The fragment is acetylated at its N-terminus and is produced synthetically for research and pharmaceutical use. Synthetic and natural forms share the same sequence.
It is usually described as an immunomodulatory peptide rather than a classical hormone. It does not travel to a single distant organ in the manner of an endocrine hormone. Classification varies across sources, and some texts group it with thymic peptides generally.
The broad outline involves immune cell activation, but the specific molecular steps remain under investigation. Different studies report effects on dendritic cells, T cells, and natural killer cells. No single receptor has been confirmed as the sole mediator.
它不是经典的内分泌激素，而是一种免疫调节肽。其作用主要通过局部免疫细胞间的信号传递实现，而非经血液循环作用于远隔器官。