The short version of prothymosin alpha fits in a sentence. The long version — which is the one that helps — is below.
Reviewed 2025-10-26. Anything still debated is marked as such rather than presented as settled.
Identity and purity are assessed with a small set of standard peptide methods. Reversed-phase high-performance liquid chromatography separates the main peak from truncated or oxidized species, and its area percentage is the usual purity measure. Mass spectrometry confirms the observed molecular mass against the expected value, while amino acid analysis or peptide mapping checks composition and sequence. Specifications for research-grade material are often stated as 95 percent or higher, though the exact limit depends on the supplier and the intended use.
Laboratory supplies of the peptide usually arrive as a lyophilized powder in sealed vials. The powder is hygroscopic, so a vial should be allowed to reach room temperature before it is opened to prevent condensation on the contents. Weighing and transfer are best performed in a low-humidity environment with clean tools. Once dissolved, the solution should be mixed gently rather than vortexed, because foaming and shear can reduce recovery of the peptide.
Storage recommendations center on low temperature, dryness, and protection from repeated freezing and thawing. The intact powder is commonly held at 20 degrees below zero Celsius or colder, while a working solution is divided into single-use aliquots to limit freeze-thaw cycles. Buffered saline or phosphate-buffered saline at neutral pH is frequently used as a diluent. Light sensitivity is not well documented, yet amber vials or foil wrapping are common practice for long-term storage of peptide stocks.
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.
| Property | Value | Notes |
|---|---|---|
| Appearance | White to off-white lyophilized powder | Hygroscopic; let the vial equilibrate before opening |
| Solubility | Freely soluble in water and aqueous buffers | Working solutions are often prepared between 0.1 and 1 mg per mL |
| Typical storage temperature | At or below 20 degrees below zero Celsius | Desiccant and sealed vials reduce moisture uptake |
| Routine purity assay | Reversed-phase HPLC with ultraviolet detection | Result reported as percentage of total peak area |
| Identity check | Mass spectrometry with amino acid analysis | Observed mass is compared with the calculated value |
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.
Identity and purity testing for thymosin alpha 1 relies mainly on reversed-phase high-performance liquid chromatography and mass spectrometry. Chromatography separates the parent peptide from truncated or modified variants, while mass spectrometry confirms the expected molecular mass. Amino acid analysis and peptide mapping provide additional sequence confirmation. Counterion content, water content, and residual solvents are measured separately as part of specification testing. No single method captures every attribute, so laboratories combine several techniques.
Thymosin alpha-1 is a synthetic peptide of 28 amino acids, corresponding to the N-terminal fragment of prothymosin alpha. Its sequence begins with acetylation at the N-terminus, a modification that affects stability and receptor interaction. The peptide is acidic, with a calculated isoelectric point near 4.2, and carries no disulfide bonds, so its secondary structure is largely flexible in solution. Molecular mass is approximately 3108 daltons. The native form was first isolated from bovine thymus tissue, while pharmaceutical material is produced by solid-phase peptide synthesis.
Within the immune system, the peptide acts on several cell types rather than a single target. Reported activities include promotion of T-cell maturation, enhancement of natural killer cell activity, and modulation of cytokine production by dendritic cells and macrophages. Some of these effects appear to operate through toll-like receptor signaling, though the precise receptor-level mechanism remains debated. Whether the observed immune changes translate into clinical benefit is a separate question and depends on the indication studied.
The peptide was described in the 1970s as a component of thymic extracts, and early research focused on restoring immune function in immunodeficiency states. A synthetic version entered clinical development in the 1980s and is approved as a drug in several countries for conditions such as chronic hepatitis B and certain immunodeficiencies. Approval status varies widely by jurisdiction, and in the United States it is not an approved therapeutic. Regulatory and clinical positions differ, so statements about efficacy should be tied to specific indications and studies.
=== Hoyle–Wickramasinghe model of panspermia === Throughout his career, Wickramasinghe, along with his collaborator Fred Hoyle, has advanced the panspermia hypothesis, that proposes that life on Earth is, at least in part, of extraterrestrial origin. The Hoyle–Wickramasinghe model of panspermia include the assumptions that dormant viruses and desiccated DNA and RNA can survive unprotected in space; that small bodies such as asteroids and comets can protect the "seeds of life", including DNA and RNA, living, fossilized, or dormant life, cellular or non-cellular; and that the collisions of asteroids, comets, and moons have the potential to spread these "seeds of life" throughout an individual star system and then onward to others. The most contentious issue around the Hoyle–Wickramasinghe model of the panspermia hypothesis is the corollary of their first two propositions that viruses and bacteria continue to enter the Earth's atmosphere from space, and are hence responsible for many major epidemics throughout history. Towards the end of their collaboration, Wickramasinghe and Hoyle hypothesised that abiogenesis occurred close to the Galactic Center before panspermia carried life throughout the Milky Way, and stated a belief that such a process could occur in many galaxies throughout the Universe.
===== MeSH D08.811.913.050 – acyltransferases (EC 2.3) ===== MeSH D08.811.913.050.080 – acetyl-CoA C-acyltransferase MeSH D08.811.913.050.134 – acetyltransferases MeSH D08.811.913.050.134.029 – acyl-carrier protein s-acetyltransferase MeSH D08.811.913.050.134.060 – acetyl-CoA C-acetyltransferase MeSH D08.811.913.050.134.105 – amino-acid n-acetyltransferase MeSH D08.811.913.050.134.150 – carnitine O-acetyltransferase MeSH D08.811.913.050.134.170 – chloramphenicol o-acetyltransferase MeSH D08.811.913.050.134.180 – choline o-acetyltransferase MeSH D08.811.913.050.134.310 – dihydrolipoyllysine-residue acetyltransferase MeSH D08.811.913.050.134.375 – glucosamine 6-phosphate n-acetyltransferase MeSH D08.811.913.050.134.407 – histone acetyltransferases MeSH D08.811.913.050.134.440 – p300-CBP coactivator family MeSH D08.811.913.050.134.440.249 – creb-binding protein MeSH D08.811.913.050.134.440.600 – e1a-associated p300 protein MeSH D08.811.913.050.134.700 – phosphate acetyltransferase MeSH D08.811.913.050.134.850 – serine O-acetyltransferase MeSH D08.811.913.050.170 – acyl-carrier protein s-malonyltransferase MeSH D08.811.913.050.173 – 1-acylglycerol-3-phosphate O-acyltransferase MeSH D08.811.913.050.175 – 1-acylglycerophosphocholine O-acyltransferase MeSH D08.811.913.050.200 – aminoacyltransferases MeSH D08.811.913.050.200.400 – gamma-glutamylcyclotransferase MeSH D08.811.913.050.200.500 – gamma-glutamyltransferase MeSH D08.811.913.050.200.700 – peptidyl transferases MeSH D08.811.913.050.200.800 – transglutaminases MeSH D08.811.913.050.200.800.300 – factor xiiia MeSH D08.811.913.050.276 – 5-aminolevulinate synthetase MeSH D08.811.913.050.294 – arylalkylamine n-acetyltransferase MeSH D08.811.913.050.313 – arylamine N-acetyltransferase MeSH D08.811.913.050.331 – atp citrate (pro-s)-lyase MeSH D08.811.913.050.350 – carnitine acyltransferases MeSH D08.811.913.050.350.170 – carnitine O-acetyltransferase MeSH D08.811.913.050.350.200 – carnitine o-palmitoyltransferase MeSH D08.811.913.050.368 – citrate (Si)-synthase MeSH D08.811.913.050.387 – diacylglycerol o-acyltransferase MeSH D08.811.913.050.425 – glycerol-3-phosphate O-acyltransferase MeSH D08.811.913.050.600 – homoserine O-succinyltransferase MeSH D08.811.913.050.612 – hydroxymethylglutaryl-CoA synthase MeSH D08.811.913.050.614 – 2-isopropylmalate synthase MeSH D08.811.913.050.618 – malate synthase MeSH D08.811.913.050.622 – 3-oxoacyl-(acyl-carrier-protein) synthase MeSH D08.811.913.050.625 – phosphatidylcholine-sterol O-acyltransferase MeSH D08.811.913.050.646 – retinol O-fatty-acyltransferase MeSH D08.811.913.050.668 – serine C-palmitoyltransferase MeSH D08.811.913.050.712 – sphingosine N-acyltransferase MeSH D08.811.913.050.799 – sterol O-acyltransferase
== Automation of the process == Structure determination by NMR has traditionally been a time-consuming process, requiring interactive analysis of the data by a highly trained scientist. There has been considerable interest in automating the process to increase the throughput of structure determination and to make protein NMR accessible to non-experts (See structural genomics). The two most time-consuming processes involved are the sequence-specific resonance assignment (backbone and side-chain assignment) and the NOE assignment tasks. Several different computer programs have been published that target individual parts of the overall NMR structure determination process in an automated fashion. Most progress has been achieved for the task of automated NOE assignment. So far, only the FLYA and the UNIO approach were proposed to perform the entire protein NMR structure determination process in an automated manner without any human intervention. Modules in the NMRFAM-SPARKY such as APES (two-letter-code: ae), I-PINE/PINE-SPARKY (two-letter-code: ep; I-PINE web server) and PONDEROSA (two-letter-code: c3, up; PONDEROSA web server) are integrated so that it offers full automation with visual verification capability in each step. Efforts have also been made to standardize the structure calculation protocol to make it quicker and more amenable to automation. Recently, the POKY suite, the successor of programs mentioned above, has been released to provide modern GUI tools and AI/ML features.
The light from LEDs can be modulated very quickly so they are used extensively in optical fiber and free-space optics communications. This includes remote controls, such as for television sets, where infrared LEDs are often used. Opto-isolators use an LED combined with a photodiode or phototransistor to provide a signal path with electrical isolation between two circuits. This is especially useful in medical equipment where the signals from a low-voltage sensor circuit (usually battery-powered) in contact with a living organism must be electrically isolated from any possible electrical failure in a recording or monitoring device operating at potentially dangerous voltages. An opto-isolator also lets information be transferred between circuits that do not share a common ground potential. Many sensor systems rely on light as the signal source. LEDs are often ideal as a light source due to the requirements of the sensors. The Nintendo Wii's sensor bar uses infrared LEDs. Pulse oximeters use them for measuring oxygen saturation. Some flatbed scanners use arrays of RGB LEDs rather than the typical cold-cathode fluorescent lamp as the light source. Having independent control of three illuminated colors allows the scanner to calibrate itself for more accurate color balance, and there is no need for warm-up. Further, its sensors only need be monochromatic, since at any one time the page being scanned is only lit by one color of light. Since LEDs can also be used as photodiodes, they can be used for both photo emission and detection.
Sources: en.wikipedia.org
Some states also require completion of a specified number of continuing education contact hours prior to issuing or renewing a license. Licensing is somewhat controversial as it adds a bureaucratic layer in a field that is severely understaffed. Simply requiring testing personnel to obtain and maintain their national certification would help ensure competent testing personnel without increasing costs to testing personnel. Some states recognize another state's license if it is equal or more stringent, but currently California does not recognize any other state license.
Jaundice Abnormal liver function test results Tardive dyskinesia – an often incurable movement disorder that usually results from years of continuous treatment with antipsychotic drugs, especially typical antipsychotics like flupenthixol. It presents with repetitive, involuntary, purposeless and slow movements; TD can be triggered by a fast dose reduction in any antipsychotic. Hypotension Confusional state Seizures Mania Hypomania Depression Hot flush Anergia Appetite changes Weight changes Hyperglycemia – high blood glucose (sugar) levels Abnormal glucose tolerance Pruritus – itchiness Rash Dermatitis Photosensitivity – sensitivity to light Oculogyric crisis Accommodation disorder Sleep disorder Impaired concentration Tachycardia QTc interval prolongation – an abnormality in the electrical activity of the heart that can lead to potentially fatal changes in heart rhythm (only in overdose or <10 ms increases in QTc) Torsades de pointes Miosis – constriction of the pupil of the eye Paralytic ileus – paralysis of the bowel muscles leading to severe constipation, inability to pass wind, etc. Mydriasis Glaucoma
The reaction between 2-chloro-2,2-diphenylacetyl chloride [2902-98-9] (1) and Deanol [108-01-0] (2) gives [3042-75-9] (3). The intermediate haloalkane is then alkoxylated by refluxing in ethanol, completing the synthesis of Dimenoxadol (4). The 2-chloro-2,2-diphenylacetyl chloride is made by reacting benzilic acid with phosphorus pentachloride.
Sources: en.wikipedia.org
Archival Resources Details Thorburn Brailsford Robertson: Repository: Commonwealth Scientific and Industrial Research Organisation (CSIRO) Corporate Records and Archives Strategies, The Encyclopedia of Australian Science and Innovation. Robertson, Thorburn Brailsford (1884–1930), The Encyclopedia of Australian Science and Innovation. Thorburn Brailsford Robertson, Adelaide Connect, University of Adelaide. Lehmann Jayne, "World Diabetes Day – Time to celebrate Adelaide’s link to 1922 insulin discovery", EdHealth Australia, 14 November 2016. Thorburn Brailsford Robertson, South Australian Medical Heritage Society. TROVE: "From the library of Thorburn Brailsford Robertson".
Shortly after the discovery of the neutron in 1932, Enrico Fermi realized that certain rare beta-decay reactions immediately yield neutrons as an additional decay particle, so called beta-delayed neutron emission. Neutron emission usually happens from nuclei that are in an excited state, such as the excited 17O* produced from the beta decay of 17N. The neutron emission process itself is controlled by the nuclear force and therefore is extremely fast, sometimes referred to as "nearly instantaneous". Isolated proton emission was eventually observed in some elements. It was also found that some heavy elements may undergo spontaneous fission into products that vary in composition. In a phenomenon called cluster decay, specific combinations of neutrons and protons other than alpha particles (helium nuclei) were found to be spontaneously emitted from atoms.
Due to decreased levels of androgens and/or neurosteroids, 5α-reductase inhibitors may slightly increase the risk of depression (~2.0% incidence). There are reports that a small percentage of men may experience persistent sexual dysfunction and adverse mood changes even after discontinuation of 5α-reductase inhibitors. Some of the possible side effects of 5α-reductase inhibitors in men, such as gynecomastia and sexual dysfunction, are actually welcome changes for many transgender women. In any case, caution may be warranted in using 5α-reductase inhibitors in transgender women, as this group is already at a high risk for depression and suicidality.
Sources: en.wikipedia.org
Aliquots are typically frozen well below zero Celsius and thawed only once, since repeated cycles promote aggregation and loss. Dilution into a neutral buffer limits degradation during short working periods, and prolonged storage at room temperature is avoided.
Research material is commonly offered at 95 percent purity or above by chromatographic area, with some suppliers listing 98 percent. Higher grades usually carry a higher price and are chosen when the assay is sensitive to trace impurities.
Mass spectrometry is the standard check, often paired with amino acid analysis or peptide mapping. A chromatographic retention time alone is generally considered insufficient for structural confirmation.
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.