The short version of lyophilized powder fits in a sentence. The long version — which is the one that helps — is below.
This page was last updated on 2026-02-27 and is reviewed periodically as new material appears.
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.
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。
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。
| Property | Value | Notes |
|---|---|---|
| Detection wavelength | 214 nm | Peptide bond absorption; 280 nm is not useful. |
| Confirmatory method | Electrospray mass spectrometry | Verifies mass near 3108 Da. |
| Solution stability | Limited at room temperature | Aqueous solutions degrade faster than powder. |
| Recommended storage | -20 °C | For lyophilized powder; protect from moisture. |
| Purity criterion | ≥95% by RP-HPLC | Typical research-grade specification. |
Lyophilized material is generally held at reduced temperature to slow degradation, and storage at minus twenty degrees Celsius or lower is common practice for long-term retention. Short-term working portions are often kept between two and eight degrees Celsius. Once dissolved, the peptide is less stable than the dry powder, and repeated freeze-thaw cycles are associated with loss of material and with aggregate formation. Vials are usually allowed to reach room temperature before opening so that condensation does not introduce moisture, and solutions are protected from light where practical.
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.
Thymosin alpha 1 is a synthetic 28-amino-acid peptide first isolated in 1966 from thymosin fraction 5, a bovine thymus extract. Its chain begins with an acetylated serine residue and ends with asparagine. The native peptide carries a molecular mass near 3,108 daltons. Researchers classify it as an immunomodulatory agent rather than a hormone with a single endocrine target. Early work framed it as a thymus-derived factor that supports T-cell maturation. The synthetic form used in research and clinical products matches the natural sequence.
Immune signaling studies link thymosin alpha 1 to Toll-like receptor pathways, particularly TLR2 and TLR9, on dendritic cells and other antigen-presenting cells. Activation of these receptors promotes maturation of T cells and increases natural killer cell activity. The peptide shifts cytokine output toward a T helper 1 profile, raising interferon gamma and interleukin 2 while modulating interleukin 10. Whether these effects translate into clinical benefit for any specific disease remains a subject of debate. Reported outcomes vary across trials and populations.
Thymosin alpha 1 is approved as a medicine in several countries, including Italy and China, for indications such as chronic hepatitis B and as an immune adjuvant. It is not approved by the United States Food and Drug Administration as a therapeutic product. In research settings the peptide appears in studies of sepsis, vaccine response, and oncology support, often with mixed or inconclusive results. The evidence base is uneven, and reviews note that many trials were small. Regulatory status therefore differs widely between jurisdictions.
Identity and purity are normally assessed by reversed-phase high-performance liquid chromatography, which separates the peptide from related impurities and truncation products. Mass spectrometry confirms molecular mass and detects modifications such as deamidation or oxidation. Amino acid analysis and peptide mapping provide additional sequence-level confirmation. For research material, a certificate of analysis typically reports these results together with water content and counter-ion identity, since the lyophilized powder is often supplied as an acetate or trifluoroacetate salt.
Several factors accelerate degradation: alkaline pH, elevated temperature, exposure to oxidants, and the presence of residual moisture. Deamidation of asparagine residues and oxidation of methionine are the most commonly reported degradation routes. Because the peptide lacks disulfide bonds, it does not undergo the thiol-related aggregation seen in some other biologics, but physical aggregation can still occur at high concentration. Stability data are product-specific, and extrapolating shelf life between formulations is not reliable.
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.
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.
=== Caffeine === One tablespoonful (5 grams) of dry unsweetened cocoa powder has 12.1 mg of caffeine and a 25-g single serving of dark chocolate has 22.4 mg of caffeine. This is much less than the amount found in coffee, of which a single 7 oz. (200 ml) serving may contain 80–175 mg of caffeine, though studies have shown psychoactive effects in caffeine doses as low as 9 mg, and a dose as low as 12.5 mg was shown to have effects on cognitive performance.
=== Deputy Leaders of the Liberal Party in the House of Commons === Donald Maclean (1920–1922) John Simon (1922–1924) Post vacant (1924–1929) Herbert Samuel (1929–1931) Archibald Sinclair (1931–1935) Francis Dyke Acland (1935–1939) Post vacant (1939–1940) Percy Harris (1940–1945) Post vacant (1945–1949) Megan Lloyd George (1949–1951) Post vacant (1951–1962) Donald Wade (1962–1964) Post vacant (1964–1976) John Pardoe (1976–1979) Post vacant (1979–1985) Alan Beith (1985–1988)
in respect of the meridians (经络辩证; jīngluò biàn zhèng) in respect of qi (气血辩证,; qì xuè biàn zhèng) in respect of xuè (气血辩证; qì xuè biàn zhèng) in respect of the body fluids (津液辩证; jīnyè biàn zhèng) in respect of the zàng-fǔ (脏腑辩证; zàngfǔ biàn zhèng) – very similar to this, though less specific, is disharmony pattern description in terms of the Five Elements [五行辩证; wǔ xíng biàn zhèng]) There are also three special pattern diagnosis systems used in case of febrile and infectious diseases only ("Six Channel system" or "six division pattern" [六经辩证; liù jīng biàn zhèng]; "Wei Qi Ying Xue system" or "four division pattern" [卫气营血辩证; weì qì yíng xuè biàn zhèng]; "San Jiao system" or "three burners pattern" [三焦辩证; sānjiaō biàn zhèng]).
He was less successful militarily: an invasion of Sicily was decisively defeated by King William I in 1156, leading to tensions with Frederick Barbarossa, the Holy Roman Emperor; two decades later, an invasion of Anatolia was defeated at the Battle of Myriokephalon.
Sources: en.wikipedia.org
== Discontinued operations == In 1998, Dairy Farm sold out its 49% interest in Nestlé Dairy Farm, set up in 1992 to develop dairy products factories throughout China, to Nestlé; on the merger of Kwik Save with Somerfield, Dairy Farm sold its 11% holding for US$290 million. Dairy Farm acquired 25% of the "No Frills" Kwik Save Group in 1987; Sold the 108-store Simago chain in Spain acquired in 1990. In March 2000, Dairy Farm sold its half share in DFI Géant, the Taiwan hypermarket opened in 1998 back to Casino, its joint venture partner. In 2001, the company sold the 287-store Franklins chain in Australia which it acquired in 1978. Its Hong Kong–based distribution business, Sims Trading, was sold to CITIC Pacific. In June 2002, the 61-store Woolworths chain in New Zealand acquired in 1990, was sold for US$337 million. In 2004, the Group's Hong Kong ice manufacturing business which began in 1918 was sold for US$107 million. In 2023, the Group's Malaysian food retailing business was sold to Macrovalue Sdn Bhd On 19 April 2024, DFI's subsidiary PT Hero Supermarket Tbk announced it would divest its supermarket businesses along with the rights to the Hero brand to PT Hero Retail Nusantara for 135 billion rupiahs. In 2025, DFI Retail Group in Singapore announced the sale of its food retail operations (Cold Storage, CS Fresh, Jasons Deli, and Giant) to Malaysian-based Macrovalue for S$125 million.
=== Narcolepsy === While MCH does promote sleep, there has been no research that links MCH to narcolepsy. Research has instead found that in individuals with narcolepsy there is a decrease in orexin neurons, which would promote wakefulness, while the number of MCH neurons do not vary from the average non-narcoleptic individual.
For the record robbery, he was sentenced to eight years in prison, but three weeks after the verdict, in July 1976, he fled again, this time by driving a Scania truck through three prison gates at Norrköping Prison. Together with a number of fellow prisoners, they fled to a waiting getaway car. On 31 July 1976, he was arrested in Halmstad. On 12 August 1976, Olofsson married Belgian national Marijke Demuynck in Kumla Prison. In 1979, while still in prison, Olofsson began studies in journalism at Stockholm University. He did an internship at the newspaper Arbetaren. During a leave on Midsummer's Eve in 1980, Olofsson got into a fight with fisherman Leif Sundin on Möja. The sentence was two and a half years for assault. His studies were interrupted by the verdict, but he eventually graduated in 1983. Olofsson was released in 1983; he then left Sweden with his wife and settled in her home country of Belgium. In November 1984, he was arrested in the port city of Blankenberge in Belgium, suspected of having tried to smuggle 25 kilograms of amphetamine into Sweden with the so-called Televerksligan ("Televerket Gang"). He was sentenced to ten years in prison for complicity in an aggravated felony drug offense.
Sources: en.wikipedia.org
Vedolizumab, sold under the brand name Entyvio, is a monoclonal antibody medication developed by Takeda Oncology for the treatment of ulcerative colitis and Crohn's disease. It binds to integrin α4β7 (LPAM-1, lymphocyte Peyer's patch adhesion molecule 1, a dimer of Integrin alpha-4 and Integrin beta-7), blocking the α4β7 integrin results in gut-selective anti-inflammatory activity.
=== Electricity demand and grid capacity === The proliferation of AI has driven a surge in data centre construction and power requirements. According to the National Energy System Operator (NESO), UK data centres consumed 5.0 TWh of electricity in 2023, equivalent to 2% of total UK electricity demand and 7% of commercial sector consumption. However, Oxford Economics forecasts that total demand could grow more than fivefold by 2030, reaching 26.2 TWh, which would represent 8.8% of total UK electricity demand and 30.4% of commercial electricity consumption. This rapid growth has created friction with the UK's net zero targets. In February 2026, the Environmental Audit Committee raised concerns that the government had not adequately factored data centre energy consumption into the draft Seventh Carbon Budget. The energy regulator Ofgem disclosed that developers of new data centres had enquired about grid connections that would require more energy at peak times than the whole of Britain consumes on some days.
=== Counseling psychology === Counseling psychologists undergo the same level of rigor in study and use many of the same interventions and tools as clinical psychologists, including psychotherapy and assessment. Traditionally, counseling psychologists helped people with what might be considered normal or moderate psychological problems—such as the feelings of anxiety or sadness resulting from major life changes or events. However, that distinction has faded over time, and of the counseling psychologists who do not go into academia (which does not involve treatment or diagnosis), the majority of counseling psychologists treat mental illness alongside clinical psychologists. Many counseling psychologists also receive specialized training in career assessment, group therapy, and relationship counseling. Counseling psychology as a field values multiculturalism and social advocacy, often stimulating research in multicultural issues. There are fewer counseling psychology graduate programs than those for clinical psychology and they are more often housed in departments of education rather than psychology. Counseling psychologists tend to be more frequently employed in university counseling centers compared to hospitals and private practice for clinical psychologists. However, counseling and clinical psychologists can be employed in a variety of settings, with a large degree of overlap (prisons, colleges, community mental health, non-profits, corporations, private practice, hospitals and Veterans Affairs).
Sources: en.wikipedia.org
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.
The lyophilized powder is usually stored at -20 °C or below. Dissolved solutions are less stable and should be prepared fresh when possible. Freeze-thaw cycling can reduce integrity.
It lacks aromatic residues, so it does not absorb strongly at 280 nm. Its negative charge and hydrophilic nature can affect chromatographic retention. These properties require method development for reliable separation.
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。