Everything below concerns Lyophilization. We keep the language plain, cite what the science says, and separate well-supported claims from open questions.
Last reviewed on 2026-06-09. Where a claim depends on a specific study, the study is described rather than over-claimed.
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.
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.
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.
Thymosin alpha-1 is supplied as a lyophilized powder in most research settings. The solid dissolves readily in water and in common aqueous buffers, and it is typically reconstituted shortly before use. Solutions are clear and colourless at ordinary working concentrations. Because the peptide is hygroscopic, weighing and reconstitution are usually performed with minimal exposure to ambient air. Aliquots are prepared to avoid repeated freeze-thaw cycles, and working solutions are kept cold.
| Property | Value | Notes |
|---|---|---|
| Molecular mass | ≈3,108 Da | Synthetic 28-residue peptide |
| Amino acid count | 28 | N-terminal serine carries an acetyl group |
| Appearance | White to off-white powder | Lyophilized solid |
| Water solubility | Freely soluble | Dissolves in aqueous buffer |
| Common synonyms | Thymalfasin; Tα1 | Thymalfasin is the international nonproprietary name |
The peptide is generated in cells by cleavage of prothymosin alpha, a larger acidic protein encoded by the PTMA gene. Prothymosin alpha is expressed in many tissues, not only in the thymus, and its functions include nuclear roles in chromatin-related processes. The 28-residue fragment corresponds to the N-terminal portion of that precursor. How the cleavage occurs and how the fragment's concentration is regulated remain open questions; circulating amounts are small and difficult to measure reliably with routine assays.
Thymosin alpha 1 is a short peptide first isolated from bovine thymus tissue in the early 1970s during fractionation work aimed at identifying factors that influence T cell development. It belongs to a family of acidic thymic peptides, and the original preparations contained several components that were later separated by chromatography. The compound is now produced synthetically rather than extracted from tissue, which removes batch variability tied to animal sourcing. Researchers describe it as an immunomodulatory peptide because laboratory studies show effects on several cell types of the innate and adaptive immune systems.
The peptide lacks cysteine, methionine, and tryptophan, so disulfide scrambling and sulfur oxidation are not major degradation routes. Instead, aspartate residues can undergo isomerization or cyclization to succinimide intermediates, generating isoaspartate variants. Hydrolysis of peptide bonds also occurs slowly in solution. These changes may reduce biological activity even when the main peak remains detectable. Stability studies therefore track both potency and the appearance of related substances.
Lyophilized thymosin alpha 1 is typically stored refrigerated at 2 to 8 degrees Celsius and kept away from light. Reconstituted solutions are less stable and are usually used promptly after preparation. Repeated freeze-thaw cycles are avoided because they can promote aggregation and loss of activity. The peptide adsorbs to some plastic and glass surfaces, so a carrier protein is often added to dilute working solutions. Manufacturer instructions and published protocols both govern handling.
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。
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.
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.
Tractor Supply Company became the first general merchandise retailer to offer same-day delivery from every store in April 2020 through Roadie. In September 2021, UPS entered an agreement to acquire Roadie for an undisclosed amount. The transaction was expected to close in the fourth quarter of 2021. Roadies, which at the time reported having 200,000 operators serving over 20,000 ZIP Codes, was expected to continue operations under its name as a separate company with no transfer of packages between the UPS and Roadies networks. The relationship between the companies goes back several years with UPS being an early investor. Earlier in 2021, UPS had begun a pilot program testing same-day deliveries via Roadies.
=== Dimensions and crystallinity === The ultrastructure of nanocellulose derived from various sources has been extensively studied. Techniques such as transmission electron microscopy (TEM), scanning electron microscopy (SEM), atomic force microscopy (AFM), wide angle X-ray scattering (WAXS), small incidence angle X-ray diffraction and solid state 13C cross-polarization magic angle spinning (CP/MAS), nuclear magnetic resonance (NMR) and spectroscopy have been used to characterize typically dried nanocellulose morphology. A combination of microscopic techniques with image analysis can provide information on fibril widths, it is more difficult to determine fibril lengths, because of entanglements and difficulties in identifying both ends of individual nanofibrils. Also, nanocellulose suspensions may not be homogeneous and can consist of various structural components, including cellulose nanofibrils and nanofibril bundles. In a study of enzymatically pre-treated nanocellulose fibrils in a suspension the size and size-distribution were established using cryo-TEM. The fibrils were found to be rather mono-dispersed mostly with a diameter of ca. 5 nm although occasionally thicker fibril bundles were present. By combining ultrasonication with an "oxidation pretreatment", cellulose microfibrils with a lateral dimension below 1 nm has been observed by AFM. The lower end of the thickness dimension is around 0.4 nm, which is related to the thickness of a cellulose monolayer sheet.
However, it is not universally accepted that objective well-being is a form of well-being in the strictest sense. This doubt is based on the idea that well-being is essentially a subjective phenomenon tied to a person's experience. According to this view, objective factors influence and indicate well-being but are not themselves forms of well-being. Some studies focus on either subjective or objective well-being. Others combine both perspectives to provide a more comprehensive picture and counterbalance their shortcomings. Although subjective and objective well-being often align, this is not necessarily the case. For example, a person scoring low on objective measures, such as low income and frail health, may nonetheless be subjectively happy.
In addition to burying human remains, many human cultures also regularly bury animal remains. Pets and other animals of emotional significance are often ceremonially buried. Most families bury deceased pets on their own properties, mainly in a yard, with a shoe box or any other type of container served as a coffin. The ancient Egyptians are known to have mummified and buried cats, which they considered deities.
Sources: en.wikipedia.org
== E == efficacy – empirical – encephalitis – end-stage disease – endemic – endogenous – endoscopy – endotoxin – endpoint – enteric – enteritis – entry inhibitors – Env – envelope – enzyme – enzyme-linked immunosorbent assay (ELISA) – eosinophil – eosinophilic folliculitis – epidemic – epidemiological surveillance – epidemiology – epithelium – epitope – Epstein-Barr virus (EBV) – erythema – erythema multiforme – erythrocytes – etiology – exogenous – exotoxin – expanded access – experimental drug – expression system
=== Climate === Climate can affect seborrheic dermatitis, and there is a lack of consensus about which climates tend to exacerbate seborrheic dermatitis the most. Some studies show low humidity and low temperature are responsible for the high frequency of seborrheic dermatitis. Others suggest hot environments may also worsen seborrhoeic dermatitis. Another described that high humidity and low UV exposure are culpable. Dry skin and an impaired skin barrier contribute to the condition. It is likely that climate and weather variations affect the water and lipid content of skin.
=== 1952 === February 6: George VI dies and Princess Elizabeth becomes Queen of the United Kingdom and of the British Dominions beyond The Seas. February 18: Greece and Turkey join NATO. April 28: The Treaty of San Francisco, signed by Japan on September 8, 1951, comes into effect, and Japan signs the Treaty of Taipei, formally ending its period of occupation and isolation, and becoming a sovereign state. June: Strategic Air Command begins deployments of Convair B-36 and B-47 Stratojet long-range nuclear bombers to overseas bases like purpose-built Nouasseur Air Base in French Morocco, placing them within unrefueled striking range of Moscow. June 14: The United States lays the keel for the world's first nuclear-powered submarine, USS Nautilus. June 30: The Marshall Plan ends, with European industrial output now well above that of 1948. July 23: Mohamed Naguib and Gamal Abdel Nasser successfully instigate a revolution in Egypt. October 2: The United Kingdom successfully tests its first atomic bomb in Operation Hurricane. The test makes the UK the world's third nuclear power. November 1: The United States tests their first thermonuclear fusion bomb, Ivy Mike. November 4: Dwight Eisenhower defeats Adlai Stevenson in the 1952 presidential election
Mayer, suggested flight to the suburbs was grounded as much in economics as race: "Present population trends clearly demonstrate that the city is, by and large, being abandoned by all except those who suffer from relatively great ... deprivations." White families were in better positions to relocate into the suburbs, in juxtaposition with black families who faced discrimination in home loans and in the real estate market. Highway construction post-WWII also contributed to white flight, specifically with the construction of the Interstate Highway System. This allowed white families to commute to work in the city from the suburbs easily and incentivized many white Detroiters to relocate thus. The construction of highways in Detroit further exacerbated the pre-existing racial segregation, as government officials built highways through areas that were seen as blighted – typically black "ghettos" – that were under-financed and under-maintained. As a result of white flight and mass migration to the suburbs, a significant change in the racial composition of Detroit occurred. From 1950 to 2010, the black/white population percentage went from 16.2%/83.6% to 82.7%/10.6%. Approximately 1,400,000 of the 1,600,000 white people in Detroit after World War II left the city for the suburbs. Beginning in the 1980s, for the first time in its history, Detroit was a majority-black city. This drastic racial demographic change resulted in more than a change in neighborhood appearance. It had political, social, and economic effects as well.
The supply of parasympathetic nerves to the face and the upper jaw (maxilla) derives from the greater superficial petrosal (GSP) branch of cranial nerve VII, the facial nerve. The GSP nerve joins the deep petrosal nerve (of the sympathetic nervous system), derived from the carotid plexus, to form the vidian nerve (in the vidian canal) that traverses the pterygopalatine ganglion (an autonomic ganglion of the maxillary nerve), wherein only the parasympathetic nerves form synapses, which serve the lacrimal gland and the glands of the nose and of the palate, via the (upper jaw) maxillary division of cranial nerve V, the trigeminal nerve.
Sources: en.wikipedia.org
=== Taubman Investment Co. subsidiary === In 1982, A. Alfred Taubman purchased A&W and placed it under Taubman Investment Co. Taubman only purchased the restaurant company and not A&W Beverages. The chain dropped to fewer than 500 locations in the mid-1980s. A freeze on issuing franchises was put in place. Taubman wanted to restructure the chain by changing its "outdated" image. Franchisees were being neglected in the United Fruit phase. Taubman opted to withdraw agreements with 100 franchisees that were performing poorly and ousted 80% of its workforce. With this, the new management decided to split its fast-food restaurants into two units – the conventional orange roof A&W restaurants, which were still the majority, and A&W Great Food Restaurants. In 1983, A&W opened its first restaurant in Thailand, at the Central Ladprao shopping mall in Bangkok. In 1985, A&W began offering the Third Pounder to compete with McDonald's Quarter Pounder. As advertised, the Third beat the Quarter in taste tests and was less expensive by weight. In his 2007 memoir, former owner A. Alfred Taubman claimed research had revealed that it had been unsuccessful in part due to Americans' widespread innumeracy, specifically their inability to understand fractions: 1/3 was perceived as smaller than 1/4 (due to the smaller denominator) despite being a larger quantity. The burger was relaunched in 2021 as the 3/9 Pound burger, humorously attempting to capitalize on the now-popular fractions misunderstanding story.
== External links == Gen-Z Matters More than Millennials: Goldman Sachs' Christopher Wolf. March 4, 2016. (Video, 3:21) We asked teenagers what adults are missing about technology. This was the best response. Taylor Fang. MIT Technology Review. December 21, 2019. Gen Y vs Z. Zeihan on Geopolitics. December 29, 2021. Why modern America creates fragile children. Jonathan Haidt, April 5, 2023.
Birch species are generally small to medium-sized trees or shrubs, mostly of northern temperate and boreal climates. The simple leaves are alternate, singly or doubly serrate, feather-veined, petiolate and stipulate. They often appear in pairs, but these pairs are really borne on spur-like, two-leaved, lateral branchlets. The fruit is a small samara, although the wings may be obscure in some species. They differ from the alders (Alnus, another genus in the family) in that the female catkins are not woody and disintegrate at maturity, falling apart to release the seeds, unlike the woody, cone-like female alder catkins. The bark of all birches is characteristically marked with long, horizontal lenticels, and often separates into thin, papery plates, especially upon the paper birch. Distinctive colors give the common names gray, white, black, silver and yellow birch to different species. The buds, forming early and full-grown by midsummer, are all lateral, without a terminal bud forming; the branch is prolonged by the upper lateral bud. The wood of all the species is close-grained with a satiny texture and capable of taking a fine polish; its fuel value is fair.
=== Preparation === This compound is prepared by oxidation of 4-aminodimethylaniline in the presence of sodium thiosulfate to give the quinonediiminothiosulfonic acid, reaction with dimethylaniline, oxidation to the indamine, and cyclization to give the thiazine:
Clean-in-place systems are typically used to remove fouling from membranes after extensive use. The CIP process may use detergents, reactive agents such as sodium hypochlorite and acids and alkalis such as citric acid and sodium hydroxide (NaOH). Sodium hypochlorite (bleach) must be removed from the feed in some membrane plants. Bleach oxidizes thin-film membranes. Oxidation will degrade the membranes to a point where they will no longer perform at rated rejection levels and have to be replaced. Bleach can be added to a sodium hydroxide CIP during an initial system start-up before spirally-wound membranes are loaded into the plant to help disinfect the system. Bleach is also used to CIP perforated stainless steel (Graver) membranes, as their tolerance for sodium hypochlorite is much higher than a spirally-wound membrane. Caustics and acids are most often used as primary CIP chemicals. Caustic removes organic fouling and acid removes minerals. Enzyme solutions are also used in some systems for helping remove organic fouling material from the membrane plant. The pH and temperature are important to a CIP program. If pH and temperature are too high the membrane will degrade and flux performance will suffer. If pH and temperature are too low, the system simply will not be cleaned properly. Every application has different CIP requirements. e.g. a dairy reverse osmosis (RO) plant most likely will require a more rigorous CIP program than a water purification RO plant. Each membrane manufacturer has their own guidelines for CIP procedures for their product.
Sources: en.wikipedia.org
It is a chain of 28 amino acids, with an acetyl group attached to the first serine residue. The synthetic version replicates this sequence. Its molecular mass is about 3,108 daltons.
It is usually described as an immunomodulatory peptide rather than a classic hormone. It acts on immune cells through receptor pathways. No single endocrine organ target defines its function.
Several countries, including Italy and China, allow it for specific indications. The FDA has not approved it as a drug in the United States. Availability depends on local regulation.
Lyophilized powder is normally kept at minus twenty degrees Celsius or below, in a sealed container, desiccated and away from light. Reconstituted solutions are less stable and are usually refrigerated and used quickly. Repeated temperature cycling should be avoided.