The short version of certificate of analysis fits in a sentence. The long version — which is the one that helps — is below.
This page was last updated on 2026-03-22 and is reviewed periodically as new material appears.
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。
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.
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.
| Property | Value | Notes |
|---|---|---|
| 化学分类 | 线性肽 | 由28个氨基酸组成 |
| 分子量 | 约3108 Da | 合成版本一致 |
| 外观 | 白色至类白色粉末 | 冻干品 |
| 溶解度 | 易溶于水 | 微溶于有机溶剂 |
| 储存温度 | -20°C（冻干） | 溶解后2-8°C |
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.
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.
Lyophilized thymosin alpha-1 is generally stored at or below minus twenty degrees Celsius, protected from moisture and light. Short-term handling at ambient temperature is possible for dry powder, but reconstituted solutions degrade faster and are usually kept at two to eight degrees Celsius with a defined expiry of days rather than weeks. Repeated freeze-thaw cycles should be avoided because they promote aggregation and loss of potency. Exact limits depend on the formulation and should follow the supplier's documentation.
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 activity of this peptide is generally described as immunomodulatory rather than directly antimicrobial. Experimental work links it to signaling through certain Toll-like receptors on dendritic cells and to downstream maturation of antigen-presenting cells. Reported effects include expansion of T cell subsets, shifts in cytokine profiles, and increased natural killer cell activity. These observations come largely from cell culture and animal models, and the precise receptor-level events in humans remain incompletely characterized.
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.
Antibody Solutions is a privately held American contract research organization headquartered in Santa Clara, California. It provides research and discovery services and fit-for-purpose antibodies to biopharmaceutical and diagnostic companies and academic researchers worldwide. The company’s services include monoclonal and polyclonal antibody and antigen development, molecular modeling, antibody sequencing and engineering, bioreactor technology, pharmacokinetic studies, antibody epitope binning, peptide synthesis, immunoassay development, ligand-binding assay analysis, and support for CAR-T research.
Troika, unable to obtain further funding from Activision or other publishers, released its employees in two waves: the first in November 2004, followed by the remaining staff in December, except for its three founders, Anderson, Boyarsky, and Tim Cain. Some employees worked without pay to fix the game. When the company closed in February 2005, it had secured no other game development deals. That month, Boyarsky confirmed that Troika had not been working on a patch for the game since most of its staff had been gone since December 2004. In a 2006 interview, Anderson said that although Troika Games's library had been critically well received, consistent technical issues had marred the perception of the company's games, contributing to Troika's difficulty in obtaining new projects. In 2013, Mitsoda said that Bloodlines was released at "the worst possible time - most people didn't even know we were out ... fans and the Troika [developers] are always going to wonder what the game could have been like with another six months." In a 2017 interview, Boyarsky echoed Mitsoda's sentiments, saying that a further three to six months of development time could have allowed Troika to address many technical flaws, but he was unsure that they could have resolved larger issues. He said, "I feel the second half of the game isn't as good as the first. I feel like we devolved into relying too much on combat at the end." Boyarsky noted that it was impossible to know if the fixes would have made Bloodlines more successful or if it would have remained a niche product.
== Media portrayals == The Edge of Love, 2008 film with Thomas portrayed by Matthew Rhys and his wife, Caitlin, played by Sienna Miller. Set Fire to the Stars, 2014 film with Thomas portrayed by Celyn Jones and John Brinnin by Elijah Wood. Dominion, 2017 film with Thomas played by Rhys Ifans and Caitlin portrayed by Romola Garai.
In Virus (2019), directed by Aashiq Abu, Kallingal played nurse Akhila, a character based on Lini Puthussery — the nurse who died treating Kerala's first patient in the 2018 Nipah virus outbreak. Lini Puthussery's husband, who attended a screening of the film, said that Kallingal's portrayal was faithful and delivered "a flawless performance as Lini". Kallingal co-produced the film with Aashiq Abu under their production banner OPM Cinemas. Sowmya Rajendran described her performance as "expressive". In the 2021 film Santhoshathinte Onnam Rahasyam, directed by Don Palathara, Kallingal played an entertainment journalist opposite Jitin Puthenchery. Baradwaj Rangan described her performance as "terrific". The film won her Best Actress at the Diorama International Film Festival. In 2023 she appeared in Neelavelicham, a horror drama co-produced with Aashiq Abu. In 2025, Kallingal starred in Theatre, written and directed by Sajin Baabu, playing Meera, a woman who has lived an isolated life on a coastal Kerala island alongside her elderly mother. The film explores the conflict between traditional belief and modern science. The film had its world premiere at the Eurasian Bridge International Film Festival in Yalta on 9 October 2025, before its theatrical release on 16 October 2025. The role was physically demanding; director Sajin Baabu noted that Kallingal spent several hours atop a coconut tree for a single scene and completed multiple retakes despite sustaining bruises.
In classical homocystinuria (CBS, or cystathione beta synthase deficiency), the plasma methionine level usually increases above the normal range of 30 micromoles/L and the concentrations should be monitored as potentially toxic levels (more than 400 micromoles/L) may be reached.
Sources: en.wikipedia.org
=== Expansion === The idea of expanding the tournament had been suggested as early as 2013 by then-UEFA president Michel Platini, as well as in 2016 by current FIFA president Gianni Infantino. Opponents of the proposal argued that the number of matches played was already at an unacceptable level, that the expansion would dilute the quality of the matches, and that the decision was driven by political rather than sporting concerns, specifically that Infantino was trying to win his election by promising to bring more countries to the World Cup. Starting with the 2026 edition, the World Cup expanded to 48 teams, an increase of 16 teams compared to the previous seven tournaments. As approved by the FIFA Council on March 14, 2023, the teams were split into 12 groups of 4 teams, with the top 2 teams in each group and the 8 best third-place teams progressing to a new round of 32. It was the first expansion and format change since 1998. The total number of matches played increased from 64 to 104, and the number of matches played by teams reaching the semifinals increased from 7 to 8. The tournament lasted 39 days, an increase from the 32 days of the 2014 and 2018 tournaments, and from the 29 days of the 2022 tournament, although each team still played three group matches. The final matchday at club level for players named in the final squads was May 24, 2026; clubs had to release their players by May 25, with exceptions granted to players participating in continental club competition finals up until May 30.
== Application == Physical organic chemists use theoretical and experimental approaches work to understand these foundational problems in organic chemistry, including classical and statistical thermodynamic calculations, quantum mechanical theory and computational chemistry, as well as experimental spectroscopy (e.g., NMR), spectrometry (e.g., MS), and crystallography approaches. The field therefore has applications to a wide variety of more specialized fields, including electro- and photochemistry, polymer and supramolecular chemistry, and bioorganic chemistry, enzymology, and chemical biology, as well as to commercial enterprises involving process chemistry, chemical engineering, materials science and nanotechnology, and pharmacology in drug discovery by design.
=== Pharmacodynamics === Penbutolol is able to bind to both beta-1 adrenergic receptors and beta-2 adrenergic receptors (the two subtypes), thus making it a non-selective β blocker. Penbutolol is a sympathomimetic drug with properties allowing it to act as a partial agonist at β adrenergic receptors. Blocking β adrenergic receptors decreases the heart rate and cardiac output to lower arterial blood pressure. β blockers also decrease renin levels, which ultimately results in less water being reabsorbed by the kidneys and therefore a lower blood volume and blood pressure. Penbutolol acts on the β1 adrenergic receptors in both the heart and the kidney. When β1 receptors are activated by a catecholamine, they stimulate a coupled G protein which activates adenylyl to convert adenosine triphosphate (ATP) to cyclic adenosine monophosphate (cAMP). The increase in cAMP ultimately alters the movement of calcium ions in heart muscle and increases heart rate. Penbutolol blocks this and decreases heart rate, which lowers blood pressure. The ability of penbutolol to act as a partial agonist proves useful in the prevention of bradycardia as a result of decreasing the heart rate excessively. Penbutolol binding β1 adrenergic receptors also alters kidney functions. Under normal physiological conditions, the enzyme renin converts angiotensinogen to angiotensin I, which will then be converted to angiotensin II.
1 November – A pooled analysis indicates that globally over half of all preschool-aged children and over two-thirds of all nonpregnant women of reproductive age are deficient in at least one of three micronutrients each. The study notes required data is scarce and such deficiencies can constrain physical and (neurocognitive) development and compromise health. 2 November – Scientists show that cells move faster in thicker (higher viscosity) fluids. Cancer cells can form memory of extracellular fluid, helping them to form distant cancerous colonies more efficiently when exposed to fluids of higher viscosities. 3 November – Astronomers using the IXPE space observatory report that 4U 0142+61, a magnetar found 13,000 light-years from Earth, likely has a solid surface with no atmosphere. 4 November – The discovery of Gaia BH1, a binary system containing what is likely the closest known black hole to Earth, is reported by astronomers in the U.S. 6–18 November – The 2022 United Nations Climate Change Conference (COP27) on climate change mitigation takes place in Sharm el-Sheikh, Egypt. 7 November The first clinical trial of laboratory-grown red blood cells transfused into people begins. Scientists warn about summarized effects of climate change on insects, among other novel stressors, which may "drastically reduce our ability to build a sustainable future based on healthy, functional ecosystems", providing several recommended mitigation options. The development of organic artificial neurons that function in and with biological systems, partly (see e.g.
Sources: en.wikipedia.org
=== Media coverage === The many murders which were carried out by the Moroccan mafia were a turning point in criminal journalism across Belgium and the Netherlands. Although the Moroccan mafia is not the first criminal phenomenon in these countries, it is the first to receive both international and intensive media coverage. The Dutch virtual tax reforms of the 2010s encouraged the emergence of inexpensive print media, which could therefore be widely distributed and relayed. These broadcasts were the precursors of a trend that gained momentum after the assassination of journalist Martin Kok in 2016. The Dutch newspaper De Telegraaf benefited greatly from the public enthusiasm for the criminal war that was taking place in its cities, which received unprecedented media coverage. While some Dutch media outlets decided to censor the first and last names of the editors who published articles, other news outlets like De Telegraaf did not give into the panic, and refused to practice censorship. After the attacks on De Telegraaf and Panorama in 2017, lawyer Christien Wildeman stated:
Unlike reference materials, working standards are typically not calibrated across multiple analytical facilities and the accepted δ value measured in a given laboratory could reflect bias specific to a single instrument. However, within a single analytical facility this bias can be removed during data reduction. Because each laboratory defines unique working standards the primary, calibration, and reference materials are long-lived while still ensuring that the isotopic composition of unknown samples can be compared across laboratories.
=== Children === Prolonged use of prednisolone eye drops in children may lead to raised intraocular pressure. While this phenomenon is dose-dependent, it is shown to have a greater effect, especially in children under 6 years of age.
28 September – TikTok announced that it had shut down a misinformation network of 72 accounts targeting Ireland, that had over 94,000 followers, saying "the operators of the accounts posted divisive views in a bid to intensify social conflict." 29 September Gardaí launched a murder investigation after a woman in her 40s died following a violent attack at her home in County Offaly. A 16-year-old boy, known to the victim, was arrested at the scene. The attack was filmed and posted on social media. Homelessness figures were released, showing that there were 12,691 people homeless in Ireland in August – a 17% increase year-on-year – including a record 3,895 homeless children.
== Micro-structures == There are many applications of directed assembly in the micro-scale, from tissue engineering to polymer thin-films. In tissue engineering, directed assembly have been able to replace scaffolding approach of building tissues. This happens by controlling the position and organization of different cells, which are the "building blocks" of the tissue, into different desired micro-structures. This eliminates the error of not being able to reproduce the same tissue, which is a major issue in the scaffolding approach.
Sources: en.wikipedia.org
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。
天然胸腺素α1主要从胸腺组织提取，也可在脾脏和淋巴结中检出。目前研究和临床使用的多为化学合成版本，不再依赖动物组织。
胸腺素组分5是牛胸腺提取物的粗组分，包含多种肽。胸腺素α1是其中一种被纯化和表征的单一肽，具有明确的28个氨基酸序列。
Cool storage below freezing is usual for long-term retention, with a desiccant and protection from light. Portions are often split before first use to avoid repeated handling.