The short version of thymalfasin fits in a sentence. The long version — which is the one that helps — is below.
This page was last updated on 2025-11-05 and is reviewed periodically as new material appears.
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 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.
| Property | Value | Notes |
|---|---|---|
| Molecular formula | C129H215N33O55 | Calculated for the acetylated 28-residue peptide |
| Appearance | White to off-white powder | Lyophilized solid recovered from aqueous buffer |
| Solubility | Freely soluble in water | Typically dissolved in water or buffer before use |
| Typical storage | -20 C or below, desiccated | Protect from light and avoid repeated freeze-thaw cycles |
| Identity testing | Reverse-phase HPLC with mass spectrometry | Retention time and measured mass confirm the sequence |
Retinol is chemically unstable in topical formulations and is sensitive to factors such as light, oxygen, heat, and heavy metals; formulation approaches including retinol derivatives, antioxidants, chelating agents, and lipid-based or nanoformulation systems have been investigated to improve stability, tolerability, and skin delivery. A common side effect of topical retinoid therapy is "retinoid dermatitis", irritation or reaction characterized by erythema, scaling, dryness, and pruritis. Topical retinol has been regulated as a cosmetic ingredient in the European Union and UK since November 2025; under Commission Regulation 2024/996, retinol was limited to a maximum of 0.05% retinol equivalent in body lotion and 0.3% in other leave-on and rinse-off products, with mandatory labelling.
The Jardin des Vestiges (Occitan: Jardin dels Vesticis) is a garden containing the archaeological remains of the ancient port of Marseille, France. The site is located in the 1st arrondissement, behind the shopping arcade in the Centre Bourse. Classified as a French historical monument, it was excavated archaeologically in 1967 and officially opened on 17 October 2009. The site was part of the ancient Greek city of Massalia. It includes parts of the ancient port and city walls, with remains of three square towers and a gateway dating back to the second or third century BC.
The plasmon resonance displayed by nanoparticles, gold particles are most often used as an example, can be altered using the interfacial layer. When either anionic or cationic ligands bound to a nanoparticle made of gold for example are increased in length, the wavelength of the plasmon resonance will shift to red. An example of another effect, that has recently been observed by Amendola et al. on small gold nanoparticles, of 10 nm or less, is that dense monolayers that consist of certain specific short chain ligands tend to dampen the surface plasmon resonance effects. Plasmon resonance can be used to analyze the surfactants of the nanoparticle. This principle is based on the so-called Fröhlich condition which states that the refractive index of the surrounding medium of a nanoparticle can be used to tune or alter the frequency of the surface plasmon resonance. The equation that relates both properties is as follows:
A 2018 review found e-cigarette vapor containing reactive oxygen radicals seem to be similar to levels in traditional cigarettes. Glyoxal and methylglyoxal found in e-cigarette vapors are not found in cigarette smoke.
=== Ice test === Applying ice for 2–5 minutes to the muscles reportedly has a sensitivity and specificity of 76.9% and 98.3%, respectively, for the identification of MG. Acetylcholinesterase is thought to be inhibited at the lower temperature, which is the basis for this diagnostic test. This generally is performed on the eyelids when ptosis is present and is deemed positive if a ≥2-mm rise in the eyelid occurs after the ice is removed.
Sources: en.wikipedia.org
On 29 July, TTP attacked the Khazina Banda Police checkpost in Hangu District killing nine policemen and wounding 28, while Pakistani forces claimed to have killed 15 insurgents in retaliation. while four FC soldiers were killed in a TTP attack on an FC post in the Musa Darra area of Hassankhel. IGP KP stated that militants in southern district of KP were using weapons left by NATO during withdrawal from Afghanistan. On 30 July, police forces neutralized a bomb in Muslim Bagh area near Serai Naurang of Lakki Marwat District. Pakistani forces killed a TTP militant in Bajaur District and two in Kulachi area of Dera Ismail Khan District. Insurgents also blew up a government school in Bajaur District. On 31 July, an Army Major and five TTP insurgents were killed in a military operation in Razmak, 15 Hafiz Gul Bahadur Group insurgents were killed throughout Bannu and one in Loi Mamond area of Bajaur District. Two members of Ahmadzai Aman committee were killed and seven wounded in a militant quadcopter strike in Barganto area of Bannu District while two policemen were killed in an ambush in Chodhwan area of Dera Ismail Khan. On 1 August, CTD claimed to have captured 54 suspected terrorists in 419 operations throughout Punjab, belonging to ISIS, Al Qaeda, LeJ, SSP and TTP. On 2 August, 10 civilians and seven Policemen were killed and 34 were wounded in a suicide attack on Kabal Police Station in Swat District, the attack being claimed by TTP. Pakistan blamed Afghanistan for sheltering and facilitating the perpetrators.
== Role of neurite-promoting factors == Neurite promoting factors include many extracellular matrix proteins produced by Schwann cells at the distal stump including fibronectin and laminin. Fibronectin are components of the basal lamina and promote neurite growth and adhesion of the growth cone to the basal lamina. In regenerating neural cells, neurite promoting factors play a role in adhesion of the axon and include neural cell adhesion molecule (N-CAM) and N-cadherin.
Patellamide A is a peptide natural product produced by Prochloron didemni, a cyanobacterial symbiont of Lissoclinum patella, and was first isolated in 1981. Patellamide A is one of many didemnid peptides. Other closely related peptides include patellamides B, C, and D and trunkamide. The patellamides and trunkamide show moderate cytotoxicity and activity against multidrug resistant cancer cell lines.
Astatine was first produced by bombarding bismuth-209 with energetic alpha particles, and this is still the major route used to create the relatively long-lived isotopes astatine-209 through astatine-211. Astatine is only produced in minuscule quantities, with modern techniques allowing production runs of up to 6.6 gigabecquerels (about 86 nanograms or 2.47×1014 atoms). Synthesis of greater quantities of astatine using this method is constrained by the limited availability of suitable cyclotrons and the prospect of melting the target. Solvent radiolysis due to the cumulative effect of astatine decay is a related problem. With cryogenic technology, microgram quantities of astatine might be able to be generated via proton irradiation of thorium or uranium to yield radon-211, in turn decaying to astatine-211. Contamination with astatine-210 is expected to be a drawback of this method. The most important isotope is astatine-211, the only one in commercial use. To produce the bismuth target, the metal is sputtered onto a gold, copper, or aluminium surface at 50 to 100 milligrams per square centimeter. Bismuth oxide can be used instead; this is forcibly fused with a copper plate. The target is kept under a chemically neutral nitrogen atmosphere, and is cooled with water to prevent premature astatine vaporization. In a particle accelerator, such as a cyclotron, alpha particles are collided with the bismuth. Even though only one bismuth isotope is used (bismuth-209), the reaction may occur in three possible ways, producing astatine-209, astatine-210, or astatine-211.
GAHT may limit fertility potential. Should a transgender individual choose to undergo gender-affirming surgery, their fertility potential is lost completely. Before starting any treatment, individuals may consider fertility issues and fertility preservation. Options include semen cryopreservation, oocyte cryopreservation, and ovarian tissue cryopreservation. A study presented at ENDO 2019 (the Endocrine Society's conference) shows that even after one year of treatment with testosterone, a transgender man can preserve his fertility potential. A 2015 study demonstrated normal spermatogenesis in some transgender women who were long-term estrogen therapy patients. In other cases, there is some research showing effective restoration of fertility by alternative means than HRT cessation alone. Dr. Will Powers has demonstrated the effectiveness of clomifene in restoring spermatogenesis in trans women. His study also includes an in-depth description of other methods for fertility restoration.
Sources: en.wikipedia.org
It is a 28-amino-acid peptide originally purified from a bovine thymic extract and later produced synthetically. It is studied mainly for its effects on immune cell function.
No. The two peptides share part of a name but differ in length, sequence, and net charge. Literature searches that treat them as one compound return misleading results.
Solid-phase peptide synthesis is the usual route, and recombinant expression has also been described. Both approaches produce material matching the natural sequence.
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.