Everything below concerns systematic review. We keep the language plain, cite what the science says, and separate well-supported claims from open questions.
Last reviewed on 2026-08-01. Where a claim depends on a specific study, the study is described rather than over-claimed.
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.
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 short peptide of 28 amino acid residues first described in the 1970s as a component of thymic extracts. Its N-terminal residue carries an acetyl group, and the sequence is highly conserved across mammalian species. The peptide is not encoded as a standalone gene product; it is released by proteolytic cleavage from the N-terminus of prothymosin alpha, a larger acidic nuclear protein. That precursor relationship places it within a broader family of thymic and immune-associated peptides that have been studied for decades.
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.
| 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 |
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.
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.
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.
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.
Thymosin alpha 1 is a short peptide of 28 amino acid residues that derives from the amino terminal region of a larger precursor protein known as prothymosin alpha. The peptide carries an acetyl group on its first residue and contains no disulfide bonds or carbohydrate chains. Its sequence is highly conserved across mammalian species, which is one reason laboratories treat it as a molecule with a defined and reproducible structure rather than a variable tissue extract. The name follows an early naming convention for thymus-derived fractions and does not imply that the peptide acts as a hormone in the classical endocrine sense.
Schymanski has developed a subset of PubChem for exposomics, PubChemLite, which can be annotated to increase ability of researchers to identify unknown environmental compounds. Within this field, Schymanski is working to automate the identification of a group of fluorinated compounds called ‘per- and poly-fluoroalkyl substances’ (PFASs) in order to increase the ability of researchers to find unknown PFAS in the environment. Schymanski is an advocate for open science and data sharing. Within the NORMAN network, a collaborative activity across Europe, North America, and Asia, Schymanski worked in 2011 with the team that established NORMAN MassBank, which was a community-driven project to gather information about small molecules. In 2015, Schymanski expanded this type of data with the NORMAN Suspect List Exchange. Schymanski has also worked to develop computational tools that allow the processing of complex high resolution mass spectrometry data and sought to establish standards to consider the quality of the mass spectrometry data. Schymanski's 2014 publication in Environmental Science & Technology establishes a means to estimate confidence in the quality of unknown organic compound identifications (now known as "Schymanski Confidence") and, as of 2021, has over 1000 citations. In 2018, Schymanski considered this paper her greatest achievement because it established the standard for compound identification in metabolomics and encouraged community conversation about future of these tools.
Later, Osborn and Weber pioneered fluorescent antibody staining of cellular substructures, a major technique called indirect immunofluorescence microscopy. In developing the method, they tagged microtubules with specific antibodies, then used fluorescently-tagged secondary antibodies (antibodies to the first set of antibodies) to light up the locations of the microtubules in cells. When they began their work in Germany, the cytoskeleton was not heavily researched. Microtubules and microfilaments were known, and they established that microtubules always reacted with antibodies to tubulins while microfilaments always reacted with antibodies to actin. In the course of their studies, they also found intermediate filaments, slightly thicker than microfilaments, and unreactive to actin antibodies. They developed new antibodies against proteins of the microtubules, intermediate filaments, and microfilaments to use as reagents in examining many types of cells. Many of their antibodies have been licensed to companies for commercial development. Klaus and Osborn used their method to study elements of the cytoskeleton of eukaryotic cells in two dimensions and three dimensions. Osborn has extensively studied microtubules, intermediate filaments, microfilaments, and nuclear proteins as well as other proteins that can associate with these structures. By 1981 Osborn and Klaus had shown conclusively intermediate filaments in different types of cells are different but related, and they can be distinguished using immunofluorescence.
=== In biomedical science === In the biomedical sciences, PVDF is used in immunoblotting as an artificial membrane (usually with 0.22 or 0.45-micrometre pore sizes), on which proteins are transferred using electricity (see western blotting). PVDF is resistant to solvents and, therefore, these membranes can be easily stripped and reused to look at other proteins. PVDF membranes may be used in other biomedical applications as part of a membrane filtration device, often in the form of a syringe filter or wheel filter. The various properties of this material, such as heat resistance, resistance to chemical corrosion, and low protein binding properties, make this material valuable in the biomedical sciences for preparation of medications as a sterilizing filter, and as a filter to prepare samples for analytical techniques such as high-performance liquid chromatography (HPLC), where small amounts of particulate matter can damage sensitive and expensive equipment. PVDF transducers have the advantage of being dynamically more suitable for modal testing than semiconductor piezoresistive transducers and more compliant for structural integration than piezoceramic transducers. For those reasons, the use of PVDF active sensors is a keystone for the development of future structural-health monitoring methods, due to their low cost and compliance.
David Nuttall. Deputy Director, Neurodiversity, Disability and Learning Disability, Department of Health and Social Care. For services to People with Down Syndrome. Hannah Louise O'Callaghan. Co-Founder, Love Grace. For services to Charitable Fundraising and Tackling Violence Against Women. Kathleen Margaret O'Hare. Board Member, Belfast Metropolitan College and Member, Northern Ireland Council for the Curriculum. For services to Education in Northern Ireland. Dr. Tunde Okewale, MBE. Barrister. For services to Criminal Justice and Social Mobility. Dr. Sandra Ngozi Okoro. Lately Senior Vice President and General Counsel, World Bank. For services to Diversity in International Finance. Dr. Robert Leslie Orford. Chief Scientific Advisor for Health, Welsh Government. For services to Health Sciences and Evidence in Health Policy. David John O'Sullivan. Chief Optometric Advisor, Welsh Government. For services to Eye Care in Wales. Professor Nicholas Ossei-Gerning. Course Co-Director, Africa PCR Conference. For services to the Field of Interventional Cardiology. Mildred Baer Palley. Philanthropist. For services to the Arts and to Education. Brian Andrew Palmer. Founder and Chief Executive, Tharsus Group Ltd. For services to Manufacturing and Skills. Catherine Jane Parry. Lately Election Agent, Labour Party. For Political and Public Service. Munir Patel. Chief Executive Officer, XRAIL Group. For services to Rail Exports. Sarah Pateman. Community Safety Manager, Stevenage Borough Council. For services to the Victims of Domestic Abuse in Hertfordshire. Dr. Graham Paterson.
Sources: en.wikipedia.org
Hydromorphone is a semi-synthetic μ-opioid agonist. As a hydrogenated ketone of morphine, it shares the pharmacologic properties typical of opioid analgesics. Hydromorphone and related opioids produce their major effects on the central nervous system and gastrointestinal tract. These include analgesia, drowsiness, mental clouding, changes in mood, euphoria or dysphoria, respiratory depression, cough suppression, decreased gastrointestinal motility, nausea, vomiting, increased cerebrospinal fluid pressure, increased biliary pressure, and increased pinpoint constriction of the pupils.
3-Hydroxymorphinan (3-HM), or morphinan-3-ol, is a psychoactive drug of the morphinan family. It is the racemic counterpart to norlevorphanol. The dextrorotatory stereoisomer of the compound is an active metabolite of dextromethorphan, dextrorphan, and 3-methoxymorphinan, and similarly to them has potent neuroprotective and neurotrophic effects on LTS- and MPTP-treated dopaminergic neurons of the nigrostriatal pathway, but notably without producing any neuropsychotoxic side effects (e.g., dissociation or hallucinations) or having any anticonvulsant actions. It does not seem to bind to the NMDA receptor, and instead, its neuroprotective properties appear result from inhibition of glutamate release via the suppression of presynaptic voltage-dependent Ca2+ entry and protein kinase C activity. In any case, as such, the compound has been investigated as a potential management of Parkinson's disease medication (antiparkinsonian agent). A prodrug, GCC1290K, has been developed on account of 3-HM's poor bioavailability (18%), and a New Drug Application has been approved for it by the United States Food and Drug Administration. It is currently undergoing clinical trials for the treatment of Parkinson's disease. It does not have a Controlled Substances Act 1970 schedule, ACSCN, or annual aggregate manufacturing quota and may not necessarily be controlled, whilst norlevorphanol is; none of the dextrorotary derivatives of the dromoran and norlevorphanol sub-families of morphinan derivatives are controlled as they do not have opioid activity but the other racemic compounds are.
In 2007, Hetero commissioned and established Asia’s largest Special Economic Zone (SEZ) for API manufacturing in Visakhapatnam, Visakhapatnam district Andhra Pradesh. The scale of the infrastructure provided by the complex enabled Hetero to pursue its ambitions as a global bulk pharmaceutical supplier.
In 1928, Grace and Pan American Airways jointly formed Pan American-Grace Airways known as Panagra, establishing the first air link between North and South America, which began operation in 1929. In 1967, Panagra merged with Braniff International Airways.
Sunak tells Prime Minister's Questions he will not return £10m donated to the Conservative Party by Frank Hester, because he has apologised and "his remorse should be accepted". Metro Bank announces it will cease seven day trading from 29 March, with 1,000 jobs also being lost by the company. The UK government announces a scheme to offer failed asylum seekers £3,000 if they agree to move to Rwanda voluntarily. 14 March Russia is reported to have jammed the GPS signal of an RAF plane carrying Defence Secretary Grant Shapps back to the UK from Poland the previous day for around 30 minutes as the plane flew near the border of the Russian territory of Kaliningrad. Speaking in the House of Commons, Secretary of State for Levelling Up, Housing and Communities Michael Gove outlines the UK government's new definition of extremism, and names five groups that would be assessed against the new criteria. They are the British National Socialist Movement, Patriotic Alternative, the Muslim Association of Britain, CAGE and Muslim Engagement and Development. The new definition is criticised by civil liberties and community groups, while most of the groups named by Gove threaten legal action if they are added to the list. A Royal Air Force plane carrying UK Defence Secretary Grant Shapps and several journalists experiences GPS signal jamming whilst flying near Kaliningrad Oblast, Russia. Mobile phone signals were also jammed during the flight. Speaking to ITV News West Country, Sunak rules out 2 May as the date of the next general election.
Sources: en.wikipedia.org
Stratum corneum Stratum lucidum (only in palms and soles) Stratum granulosum Stratum spinosum Stratum basale (also called the stratum germinativum) Keratinocytes in the stratum basale proliferate through mitosis and the daughter cells move up the strata changing shape and composition as they undergo multiple stages of cell differentiation to eventually become anucleated. During that process, keratinocytes will become highly organized, forming cellular junctions (desmosomes) between each other and secreting keratin proteins and lipids which contribute to the formation of an extracellular matrix and provide mechanical strength to the skin. Keratinocytes from the stratum corneum are eventually shed from the surface (desquamation). The epidermis contains no blood vessels, and cells in the deepest layers are nourished by diffusion from blood capillaries extending to the upper layers of the dermis.
The behaviour of fluids at the microscale can differ from "macrofluidic" behaviour in that factors such as surface tension, energy dissipation, and fluidic resistance start to dominate the system, as opposed to inertial effects. Microfluidics studies how these behaviours change, and how they can be worked around, or exploited for new uses. At small scales (channel size of around 100 nanometers to 500 micrometers) some unintuitive properties appear. In particular, the Reynolds number (which compares the effect of the momentum of a fluid to the effect of viscosity) can become very low. One consequence is co-flowing fluids do not necessarily mix in the traditional sense, as flow becomes laminar rather than turbulent; molecular transport between them must often be through diffusion. High specificity of chemical and physical properties (concentration, pH, temperature, shear force, etc.) can also be ensured resulting in more uniform reaction conditions and higher grade products in single and multi-step reactions.
=== National security === Xi has devoted a large amount of work towards national security, calling for the establishment of a holistic national security concept that encompasses "all aspects of the work of the party and the country." He introduced the concept in 2014, which he defined as taking "the security of the people as compass, political security as its roots, economic security as its pillar, military security and cultural security as its protections, and that relies on the promotion of international security." A new National Security Commission was formed in 2014 with Xi at its helm, centralizing national security decision-making. Since its creation by Xi, the National Security Commission has established local security committees, focusing on dissent. Believing it to be an important foundation of national security, Xi's administration has prioritized efforts to establish food security by pushing for as much as self-sufficiency in food as possible, while launching the Clean Plate campaign in 2013 and 2020 to combat food waste. He has additionally given priority to energy security; China is the world's largest energy consumer, having consumed more energy than the United States, the European Union and Japan combined in 2024. China has made heavy investments in its energy grid and designed policies to lessen dependence on foreign energy imports by investing in renewable energy as well as coal. Xi has championed the Fengqiao experience, calling on officials to contain and resolve conflicts at the grassroots level without needing to involve higher legal bodies.
=== Antibody-based method === Antibodies are known for their high affinity and selectivity, making them a good way to detect AMPylated proteins. Recently, ɑ- AMP antibodies were developed to directly detect and isolate AMPylated proteins (especially AMPylated tyrosine and AMPylated threonine) from cells and cell lysates. AMPylation is a post-translational modification that can be found on many protein sequences. Thus, instead of using antibodies that detect a specific AMPylated peptide sequence, raising AMP antibodies directly targeted to specific amino acids are considered superior.
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.
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.