The short version of freeze-thaw fits in a sentence. The long version — which is the one that helps — is below.
Reviewed 2026-04-03. Anything still debated is marked as such rather than presented as settled.
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.
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.
临床研究将Tα1用于慢性病毒感染、肿瘤辅助治疗和疫苗佐剂等场景。部分试验报告了免疫学指标改善，但临床终点获益在不同研究中并不一致。系统综述指出，研究间在人群、剂量和联合方案上差异较大，难以汇总结论。因此，Tα1的确切临床地位仍属开放问题，需要更多高质量随机对照试验来澄清。其机制研究也需从体外实验向体内模型推进。
胸腺素α1对免疫系统的影响涉及多种细胞类型。研究表明，它可促进未成熟T细胞向成熟T细胞分化，并增强T细胞对抗原刺激的增殖反应。树突状细胞在Tα1存在下表达更高水平的共刺激分子，从而更有效地呈递抗原。此外，自然杀伤细胞的活性也观察到上升。这些效应并非直接杀伤病原体，而是调节宿主免疫应答的强度与方向。
在信号层面，Tα1可能通过Toll样受体等模式识别受体发挥作用。部分实验显示，它能激活髓样分化因子88依赖的通路，进而促进核因子κB进入细胞核。这导致白细胞介素2、干扰素γ和白细胞介素12等细胞因子的转录增加。这些细胞因子偏向辅助性T细胞1型应答，有助于细胞免疫。然而，具体受体和结合位点尚未完全确定，不同实验模型的结果存在差异。
| Property | Value | Notes |
|---|---|---|
| Residue count | 28 amino acids | Acetyl group on the first residue |
| Approximate molecular mass | 3108 daltons | Calculated from the consensus sequence |
| Origin | Cleavage product of prothymosin alpha | Not encoded as a separate gene product |
| Primary research focus | Immune modulation | Studied in viral hepatitis and as a vaccine adjuvant |
| Common synonyms | Thymalfasin, Tα1, thymosin alpha 1 | Thymalfasin is the assigned nonproprietary name |
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.
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 names appear in the literature for this peptide, including thymalfasin and the abbreviation T-alpha-1. Naming conventions differ among research articles, regulatory documents, and supplier catalogs, which complicates literature searches. Both synthetic and recombinant production routes yield a peptide with the same 28-residue sequence as the thymic isolate. Because the thymosin label also covers unrelated peptides, sources should be compared by sequence rather than by name alone.
The peptide occurs naturally in thymic tissue and has been detected in serum and other biological fluids. Reported concentrations are low, and reliable measurement generally requires immunoassay or mass spectrometry with an enrichment step. It is released from a larger precursor, prothymosin alpha, by proteolytic cleavage, although the enzymes involved are not fully characterized. Whether circulating levels reflect thymic output specifically remains an open question.
Thymosin alpha 1 is a 28-amino-acid peptide first isolated from thymosin fraction 5, a bovine thymic extract. Its sequence begins with an acetylated serine residue and carries a high proportion of acidic residues, so the molecule has a net negative charge near neutral pH. Despite the shared name, it is unrelated in sequence to the thymosin beta family. Synthetic material prepared by solid-phase peptide synthesis is identical in sequence to the natural peptide.
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.
In February 2007, it was announced that Boots, the UK pharmacy chain, would try over-the-counter sales of Viagra in stores in Manchester, England. Males between the ages of 30 and 65 would be eligible to buy four tablets after a consultation with a pharmacist. In 2017, the Medicines and Healthcare products Regulatory Agency (MHRA) enacted legislation that expanded this nationwide, allowing a particular branded formulation of Sildenafil, Viagra Connect (50 mg), to be sold over the counter and without a prescription throughout the UK from early 2018. While the sale remains subject to a consultation with a pharmacist, the other restrictions from the trial have been removed, allowing customers over the age of 18 to purchase an unlimited number of pills. In May 2013, Pfizer, which manufactures Viagra, told the Associated Press they will begin selling the drug directly to people on its website. Pfizer's patents on Viagra expired outside the US in 2012; in the US they were set to expire, but Pfizer settled litigation with each of Mylan and Teva which agreed that both companies could introduce generics in the US in December 2017. In December 2017, Pfizer released its own generic version of Viagra. As of 2018, the US Food and Drug Administration has approved fifteen drug manufacturers to market generic sildenafil in the United States. Seven of these companies are based in India. The patent for Pfizer's Viagra sildenafil to treat erectile dysfunction expired in April 2020.
the 2001 observation, that non-diabetic offspring of type 2 diabetics had increased arterial stiffness and neuropathy despite normal blood glucose levels, the 2008 observation, that non-diabetic first-degree relatives of diabetics had elevated enzyme levels associated with diabetic renal disease and nephropathy. the 2007 finding that non-diabetic family members of type 1 diabetics had increased risk for microvascular complications, such as diabetic retinopathy Some genes appear to provide protection against diabetic complications, as seen in a subset of long-term diabetes type 1 survivors without complications.
=== Working conditions === Documentary translators very often have to meet tight deadlines. Normally, the translator has between five and seven days to hand over the translation of a 90-minute programme. Dubbing studios typically give translators a week to translate a documentary, but in order to earn a good salary, translators have to deliver their translations in a much shorter period, usually when the studio decides to deliver the final programme to the client sooner or when the broadcasting channel sets a tight deadline, e.g. on documentaries discussing the latest news. Another problem is the lack of a post-production script or the poor quality of the transcription. A correct transcription is essential for a translator to do their work properly; however, many times the script is not even given to the translator, which is a major impediment since documentaries are characterised by "the abundance of terminological units and very specific proper names". When the script is given to the translator, it is usually poorly transcribed or outright incorrect making the translation unnecessarily difficult and demanding because all of the proper names and specific terminology have to be correct in a documentary programme in order for it to be a reliable source of information, hence the translator has to check every term on their own. Such mistakes in proper names are for instance: "Jungle Reinhard instead of Django Reinhart, Jorn Asten instead of Jane Austen, and Magnus Axle instead of Aldous Huxley".
Upon heating a dilute potassium hydroxide solution with glucose to 100 °C, a strong reddish browning and a caramel-like odor develops. Concentrated sulfuric acid dissolves dry glucose without blackening at room temperature forming sugar sulfuric acid. In a yeast solution, alcoholic fermentation produces carbon dioxide in the ratio of 2.0454 molecules of glucose to one molecule of CO2. Glucose forms a black mass with stannous chloride. In an ammoniacal silver solution, glucose (as well as lactose and dextrin) leads to the deposition of silver. In an ammoniacal lead acetate solution, white lead glycoside is formed in the presence of glucose, which becomes less soluble on cooking and turns brown. In an ammoniacal copper solution, yellow copper oxide hydrate is formed with glucose at room temperature, while red copper oxide is formed during boiling (same with dextrin, except for with an ammoniacal copper acetate solution). With Hager's reagent, glucose forms mercury oxide during boiling. An alkaline bismuth solution is used to precipitate elemental, black-brown bismuth with glucose. Glucose boiled in an ammonium molybdate solution turns the solution blue. A solution with indigo carmine and sodium carbonate destains when boiled with glucose.
Monster Energy is the primary sponsor for Yamaha Motor Racing in MotoGP since 2019 and also sponsors riders such as Valentino Rossi, Franco Morbidelli, and Francesco Bagnaia. The firm has also been the title sponsor of the Catalan motorcycle Grand Prix since 2014, and the British motorcycle Grand Prix since 2021. The brand has been the main sponsor of the Speedway Grand Prix and Speedway World Cup since 2012, and also supports several riders. Monster has sponsored motocross riders such as Jeremy McGrath, Chad Reed, Ryan Villopoto, Nate Adams, Taka Higashino and Ricky Carmichael. The brand sponsors the Kawasaki, and Yamaha motocross factory teams. In 2016, the firm aided the return of factory Yamaha to the United States as the title sponsor of the team, officially named Monster Energy/360fly/Chaparral/Yamaha Factory Racing. During this time, Monster Energy served as a title sponsor for the Star Racing Yamaha team, which also took over the 450 program from Factory Yamaha in 2021. They have gone on to win the 2021 AMA Pro Motocross Championship with Dylan Ferrandis, and the 2022 AMA Supercross and AMA Pro Motocross Championships with Eli Tomac. The brand is also the main sponsor of the Honda and Hero factory teams in the FIM Cross-Country Rallies World Championship and later the World Rally-Raid Championship since 2016 and 2023 respectively.
Sources: en.wikipedia.org
=== Dicamba lawsuit === On 27 January 2020, the first-ever lawsuit concerning Dicamba-related products began in Cape Girardeau, Missouri. The lawsuit involved a peach farmer who alleged that Dicamba-based herbicides caused significant damage to his crops and trees. It had also been filed in November 2016, when Dicamba was still owned by Monsanto. On 14 February 2020, the jury involved in the lawsuit ruled against BASF and its co-defendant Bayer, which had acquired Monsanto and its products, and found in favor of the peach grower, Bader Farms owner Bill Bader. BASF and Bayer were also ordered to pay Bader $15 million in damages. On 15 February 2020, Monsanto and BASF were ordered to pay an additional $250 million in punitive damages.
AntWiki – Bringing Ants to the World Wilson, Andrew (1878). "Ant" . Encyclopædia Britannica. Vol. II (9th ed.). pp. 94–100. AntWeb from The California Academy of Sciences Ant Species Fact Sheets from the National Pest Management Association on Argentine, Carpenter, Pharaoh, Odorous, and other ant species Ant Genera of the World – distribution maps The super-nettles. A dermatologist's guide to ants-in-the-plants
It was generally felt in the court that the emperor should marry and produce heirs as soon as possible. Various potential brides were considered, including Archduchess Elisabeth Franziska of Austria, Princess Anna of Prussia and Princess Sidonia of Saxony. Although in public life Franz Joseph was the unquestioned director of affairs, in his private life his mother still wielded crucial influence. Sophie wanted to strengthen the relationship between the Houses of Habsburg and Wittelsbach—descending from the latter house herself—and hoped to match Franz Joseph with her sister Ludovika's eldest daughter, Helene ("Néné"), who was four years the emperor's junior. However, Franz Joseph fell deeply in love with Néné's younger sister Elisabeth ("Sisi"), a beautiful girl of 15, and insisted on marrying her instead. Sophie acquiesced, despite her misgivings about Sisi's appropriateness as an imperial consort, and the young couple were married on 24 April 1854 in St. Augustine's Church, Vienna.
Exosomal polycystin-1-interacting protein is a protein that, in humans, is encoded by the EPCIP gene. EPCIP is found on human chromosome 21, and it is thought to be expressed in tissues of the brain and reproductive organs. Additionally, EPCIP is highly expressed in ovarian surface epithelial cells during normal regulation, but is not expressed in cancerous ovarian surface epithelial cells.
== Structure == ACTH receptors are the shortest of the melanocortin receptor family and are the smallest known G-coupled receptors. Both human and bovine ACTH receptors are synthesized as 297 residue long proteins with 81% sequence homology. There are currently no available protein X-ray crystallography structures for the ACTH receptor available in the Protein Data Bank; while the ACTH receptor and the β2 adrenergic receptor are relatively distantly-related with a sequence identity of approximately 26%, MC2R investigators such as David Fridmanis have assumed that the folded surfaces of both receptors that are responsible for binding Gαs should be very similar and use conserved motifs. The full length sequence of MC2R includes seven hydrophobic domains that are predicted as transmembrane segments. In the third intracellular loop of the receptor a protein kinase A and protein kinase c phosphorylation motifs have been detected. ACTH receptors also require the binding of melanocortin-2 receptor accessory protein-1 (MRAP1) without which ACTH receptors cannot bind ACTH. Without MRAP, the receptor is degraded in the endoplasmic reticulum, but with MRAP, the receptor is glycosylated and expressed on the cell plasma membrane.
Sources: en.wikipedia.org
== External links == molecularfarming.com Official site Molecular Farming – Plant Bioreactors Moss bioreactors do not smell (Interview with Ralf Reski) Molecular Pharming – pharmaceuticals with the help of GM plants Pharming for Farmaceuticals "Pharming the Field: A Look at the Benefits and Risks of Bioengineering Plants to Produce Pharmaceuticals". The Pew Charitable Trusts. July 18, 2002. USDA-APHIS Biotechnology Regulatory Services[link removed] EPA Biotechnology page FDA Biotechnology page Archived 2009-05-17 at the Wayback Machine Homepage of the Coordinated Framework for Regulation of Biotechnology Draft Guidance for APHIS Permits for Field Testing or Movement of Organisms with Pharmaceutical or Industrial Intent PlantPharma.org Online Community Archived 2021-04-18 at the Wayback Machine National Science Foundation Pharma-Planta Consortium Biotechnology Industry Organization Society for Moleculture, a non-for-profit organisation for plant- factories, Québec, Canada
Official website Freeman Dyson at IMDb Appearances on C-SPAN Oral history interview transcript with Freeman Dyson on 17 December 1986, American Institute of Physics, Niels Bohr Library & Archives Freeman Dyson on INSPIRE-HEP
== Applications == MALDI-MSI involves the visualization of the spatial distribution of proteins, peptides, lipids, and other small molecules within thin slices of tissue, such as animal or plant. The application of this technique to biological studies has increased significantly since its introduction. MALDI-MSI is providing major contributions to the understanding of diseases, improving diagnostics, and drug delivery. Significant studies are of the eye, cancer research, drug distribution, and neuroscience. MALDI-MSI has been able to differentiate between drugs and metabolites and provide histological information in cancer research, which makes it a promising tool for finding new protein biomarkers. However, this can be challenging because of ion suppression, poor ionization, and low molecular weight matrix fragmentation effects. To combat this, chemical derivatization is used to improve detection. Using chemical derivatization, MALDI-MSI is particularly effective in the field of neurodegenerative disease research. The technique enables comprehensive mapping of a wide range of metabolites, such as neurotransmitters and fatty acids. These metabolites are crucial for normal brain function and are often implicated in various brain diseases. This capability is invaluable for exploring the progression and pathogenesis of diseases such as Parkinson's and Alzheimer's. By identifying changes in metabolic pathways early, MALDI-MSI can contribute to the development of better diagnostic markers and therapeutic targets, aiding in earlier detection and more tailored treatments.
Williams contributed to understanding of the distribution of the chemical elements in living organisms and in collaborationwith João J. R. Fraústo da Silva he wrote three books in this area, as well as a book with Rosalind Rickaby on geological aspects of life. Williams retired in 1991 and devoted much of his retirement to the writing of the books mentioned.
Sources: en.wikipedia.org
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.
The two share a family name but have different sequences, sizes, and functions. Thymosin beta-4 is a 43-residue peptide associated with actin binding and cell migration. Thymosin alpha-1 is a 28-residue peptide linked mainly to immune signaling.
Thymalfasin is the assigned international nonproprietary name for the synthetic 28-residue peptide. Thymosin alpha-1 is the descriptive research name for the same molecule. Which term appears depends on the context and the regulatory document.
它促进未成熟T细胞分化并增强成熟T细胞的增殖与细胞因子分泌。这些作用有助于放大抗原特异性免疫应答。