A practical reference on immunomodulator: what it is, how it behaves, what the literature reports, and where the honest uncertainties sit.
Reviewed 2025-09-02. Anything still debated is marked as such rather than presented as settled.
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.
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 |
|---|---|---|
| First described | 1977 | Reported as a component of thymosin fraction 5 |
| Sequence length | 28 amino acids | N-terminal residue is acetylated |
| Net charge at neutral pH | Negative | Reflects a high proportion of acidic residues |
| Principal studied uses | Chronic hepatitis B and vaccine adjuvant | Research uses outnumber approved indications |
| Regulatory status | Approved in a limited number of countries | Not approved in the United States or most of Europe |
Biologically, the peptide is studied mainly in the context of immune cell development and regulation. It is produced in the thymus and in several other tissues, and it appears to influence the maturation and activity of T cells and other immune populations. Laboratory work describes effects on cytokine production, on the balance between T cell subsets, and on the function of dendritic cells. Much of this evidence comes from cell culture and animal models, so the extent to which the same pathways operate in humans remains an open question.
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.
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.
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.
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.
Identity and purity are usually checked by reverse-phase high-performance liquid chromatography, which separates the intact chain from truncated products, together with mass spectrometry for confirmation of the expected mass. Peptide mapping after enzymatic digestion and amino acid analysis add sequence-level evidence. Release testing also covers water content, residual solvents, and counter-ions, all of which influence measured mass and stability. Related-peptide limits are commonly expressed as a percentage of total peak area, with individual unspecified impurities held below a lower threshold.
The lyophilized peptide is a white to off-white powder that dissolves freely in water and in aqueous buffers near neutral pH. Because the molecule carries a net negative charge under physiological conditions, saline and phosphate solutions are the usual vehicles, while strongly acidic media are avoided. Stock solutions are commonly divided into small aliquots so that repeated freezing and thawing can be limited, since cycling may encourage aggregation. Solubility in organic solvents is poor and those solvents are seldom used as primary diluents.
Recommended storage for the dry powder is a freezer near minus twenty degrees Celsius, kept desiccated and away from light. Once dissolved, the peptide is less stable and is usually held at two to eight degrees Celsius for short intervals or frozen for longer storage. Stability studies focus on the acetylated terminus and the disulfide linkage because those features define the intact molecule. Common degradation routes include cysteine oxidation, deamidation of asparagine or glutamine side chains, and slow formation of higher-molecular-weight species.
Iodine-131 (131I, I-131) is a radioisotope of iodine discovered by Glenn Seaborg and John Livingood in 1938 at the University of California, Berkeley. It has a radioactive decay half-life of about eight days. It is associated with nuclear energy, medical diagnostic and treatment procedures, and natural gas production. It also plays a major role as a radioactive isotope present in nuclear fission products, and was a significant contributor to the health hazards from open-air atomic bomb testing in the 1950s, and from the Chernobyl disaster, as well as being a large fraction of the contamination hazard in the first weeks in the Fukushima nuclear crisis. This is because 131I is a major fission product of uranium and plutonium, comprising nearly 3% of the total products of fission (see fission product yield). Due to its beta decay, iodine-131 causes mutation and death in cells that it penetrates, and other cells up to several millimeters away. For this reason, high doses of the isotope are sometimes less dangerous than low doses, since they tend to kill thyroid tissues that would otherwise become cancerous as a result of the radiation. For example, children treated with moderate dose of 131I for thyroid adenomas had a detectable increase in thyroid cancer, but children treated with a much higher dose did not. Likewise, most studies of very-high-dose 131I for treatment of Graves' disease have failed to find any increase in thyroid cancer, even though there is linear increase in thyroid cancer risk with 131I absorption at moderate doses.
Six reserve landing grounds were constructed for landing and take-off instruction to prevent congestion on the main airstrips. Later in the war, a dedicated air station was designated for the training of instructors. Small administrative units were established in South Africa at Cape Town, Durban and Port Elizabeth to handle incoming equipment and arrivals and departures of personnel. The complete pilot's course initially lasted six months, split into two months each of elementary, intermediate and advanced instruction. Ground subjects were also taught and each trainee had to fly at least 150 hours to qualify. By the end of the war each period had been shortened by a week to speed up the output of trained pilots. The trainees were mostly British, but came from all over the world. "The diversity of nationalities under training was surprising and impressive," reported one officer. "British, South African, New Zealand, Australian, Canadian, American, men from Yugoslavia, Greece, Free France, Poland, Czechoslovakia, Kenya, Uganda, Tanganyika, Fiji Isles, Malta." "[Southern Rhodesia's] part in the Commonwealth Air Training Scheme has been outstandingly fine," Sir James Ross of the British Air Ministry reported in 1942. "I say this from knowledge and without qualification. ... I know how gratefully the Air Staff in London reckon on the unfailingly regular flow of well-trained pilots and observers, course after course, month after month."
== Description == This parasite's normal life cycle involves wild canids and ticks. Domestic dogs are accidental hosts. It has been reported from Argentina, Brazil and Uruguay. This parasite is transmitted by ticks. After injection into the vertebrate host the parasite migrates to endothelial cells of the capillaries. The parasites lie within parasitophorous vacuoles that have a trilaminar membrane with villar protrusions. An apical complex is present which includes a polar ring and rhoptries but lacks a conoid. The parasites may also invade erythrocytes and leukocytes.
Kiana Fitzgerald of Consequence also praised the album's guest performances and lyrical versatility ("The brothers are as contemplative as they are comedic") and complimented the production, highlighting "M.T.B.T.T.F."'s specifically as evoking the golden era of hip-hop. Simon Vozick-Levinson of Rolling Stone gave the album four stars out of five, praising Clipse's "fascinating" emotional growth, but noting that it at times felt like a Pusha T solo album rather than a Clipse album. In an unrated positive review for Variety, Peter A. Berry praised the duo's chemistry, but criticized Williams's contributions, describing the album's production as "somewhat unimaginative" and his choruses on "So Far Ahead" and "By the Grace of God" as "ham-fisted tropes". Jordan Darville of The Fader called the album a "daring move" and a "solid, occasionally brilliant project" with an emotional core around Malice's Christian faith, praising the "grand" instrumentals and Clipse's more introspective lyrics than previous releases, while feeling that the features were more of a mixed bag, specifically criticizing "All Things Considered" for Williams and The-Dream's contributions. Marko Djurdjić of Exclaim! gave the "hostile, paranoid, and often inspiring album" a seven out of ten, praising the overall style of the rapping ("This is fucking rapping, and it is relentless.") and the "beyond impressive" writing while criticizing the flows as repetitive and describing the production on some tracks as "tedious [and] unnecessary".
However, a sufficiently chemically skilled malicious actor could extract a volatile species from inert material and/or achieve a similar effect of dispersion by physically grinding the inert matrix into a fine dust.
Sources: en.wikipedia.org
Ethinylestradiol, conjugated estrogens, and other non-bioidentical estrogens largely stopped being used in transgender women in favor of estradiol starting around 2000 due to their greater risks of blood clots and cardiovascular issues. In modern times, hormone therapy in transgender women is usually done with the combination of an estrogen and an antiandrogen. In some places however, such as Japan, use of antiandrogens is uncommon, and estrogen monotherapy, for instance with high-dose injectable estradiol esters, is still frequently used.
This low dose of radioiodine is typically tolerated by individuals otherwise allergic to iodine (such as those unable to tolerate contrast mediums containing larger doses of iodine, such as used in CT scan, intravenous pyelogram (IVP), and similar imaging diagnostic procedures). Excess radioiodine that does not get absorbed into the thyroid gland is eliminated by the body in urine. Some people with hyperthyroidism may experience a slight allergic reaction to the diagnostic radioiodine and may be given an antihistamine. The person returns 24 hours later to have the level of radioiodine "uptake" (absorbed by the thyroid gland) measured by a device with a metal bar placed against the neck, which measures the radioactivity emitted from the thyroid. This test takes about 4 minutes while the uptake % (i.e., percentage) is accumulated (calculated) by the machine software. A scan is also performed, wherein images (typically a center, left, and right angle) are taken of the contrasted thyroid gland with a gamma camera; a radiologist will read and prepare a report indicating the uptake % and comments after examining the images. People with hyperthyroidism will typically "take up" higher-than-normal levels of radioiodine. Normal ranges for RAI uptake are from 10 to 30%. In addition to testing the TSH levels, many doctors test for T3, Free T3, T4, and/or Free T4 for more detailed results. Free T4 is unbound to any protein in the blood.
== External links == Anatomy photo: nervous/pns/nerve1/nerve1 - Comparative Organology at University of California, Davis - "PNS, nerve (LM, Low)" Anatomy photo: nervous/pns/nerve2/nerve1 - Comparative Organology at University of California, Davis - "PNS, nerve (LM, Medium)" Diagram at Howard
=== Supplementation === Some weight trainers also take ergogenic aids such as creatine or anabolic steroids to aid muscle growth. In a meta-analysis study that investigated the effects of creatine supplementation on repeated sprint ability, it was discovered that creatine increased body mass and mean power output. The creatine-induced increase in body mass was a result of fluid retention. The increase in mean power output was attributed to creatine's ability to counteract the lack of intramuscular phosphocreatine. Creatine does not have an effect on fatigue or maximum power output.
Sources: en.wikipedia.org
==== Canthopexy and canthoplasty ==== Canthopexy and canthoplasty are procedures used to support and stabilize the lateral canthus. These techniques help maintain proper eyelid position, particularly in lower blepharoplasty, and may reduce the risk of postoperative eyelid malposition.
==== Peripheral muscle fatigue ==== Peripheral muscle fatigue during physical work is considered an inability for the body to supply sufficient energy or other metabolites to the contracting muscles to meet the increased energy demand. This is the most common case of physical fatigue—affecting a national average of 72% of adults in the work force in 2002. This causes contractile dysfunction that manifests in the eventual reduction or lack of ability of a single muscle or local group of muscles to do work. The insufficiency of energy, i.e. sub-optimal aerobic metabolism, generally results in the accumulation of lactic acid and other acidic anaerobic metabolic by-products in the muscle, causing the stereotypical burning sensation of local muscle fatigue, though recent studies have indicated otherwise, actually finding that lactic acid is a source of energy. The fundamental difference between the peripheral and central theories of muscle fatigue is that the peripheral model of muscle fatigue assumes failure at one or more sites in the chain that initiates muscle contraction. Peripheral regulation therefore depends on the localized metabolic chemical conditions of the local muscle affected, whereas the central model of muscle fatigue is an integrated mechanism that works to preserve the integrity of the system by initiating muscle fatigue through muscle derecruitment, based on collective feedback from the periphery, before cellular or organ failure occurs.
The Turkestan Soviet Federative Republic was proclaimed in 1918 but did not survive to the founding of the USSR, becoming the short-lived Turkestan Autonomous Soviet Socialist Republic of the RSFSR. The Crimean Soviet Socialist Republic (Soviet Socialist Republic of Taurida) was also proclaimed in 1918, but did not become a union republic and was made into an autonomous republic of the RSFSR, although the Crimean Tatars had a relative majority until the 1930s or 1940s according to censuses. When the Tuvan People's Republic joined the Soviet Union in 1944, it did not become a union republic, and was instead established as an autonomous republic of the RSFSR. In 1944, ideas of accession were circulating among a number of Mongolian intellectuals and political figures, but the leader of the Mongolian People's Republic at the time, Khorloogiin Choibalsan dismissed and blocked the issue in late 1944 as "useless banter," adding that raising it was "untimely, and even harmful." His successor, Yumjaagiin Tsedenbal, supported the idea, though nothing substantial came of it. The leader of the People's Republic of Bulgaria, Todor Zhivkov, suggested in 1963 and again in the early 1970s that the country should become a union republic, but the offer was rejected. Nikita Khrushchev rejected the idea because he thought Zhivkov wanted "easy access to higher living standards" by becoming a union republic. Whilst Leonid Brezhnev would reject the later proposal because he saw it as diplomatically impracticable.
Baked clay pellets are suitable for hydroponic systems in which all nutrients are carefully controlled in water solution. The clay pellets are inert, pH-neutral, and do not contain any nutrient value. The clay is formed into round pellets and fired in rotary kilns at 1,200 °C (2,190 °F). This causes the clay to expand, like popcorn, and become porous. It is light in weight, and does not compact over time. The shape of an individual pellet can be irregular or uniform depending on brand and manufacturing process. The manufacturers consider expanded clay to be an ecologically sustainable and re-usable growing medium because of its ability to be cleaned and sterilized, typically by washing in solutions of white vinegar, chlorine bleach, or hydrogen peroxide (H2O2), and rinsing completely. Another view is that clay pebbles are best not re-used even when they are cleaned, due to root growth that may enter the medium. Breaking open a clay pebble after use can reveal this growth.
== Mechanism == A key advantage of PRRT over other methods of radiotherapy is the ability to target delivery of therapeutic radionuclides directly to the tumour or target site. This works because some tumours have an abundance (overexpression) of peptide receptors, compared to normal tissue. A radioactive substance can be combined with a relevant peptide (or its analogue) so that it preferentially binds to the tumour. With a gamma emitter as the radionuclide, the technique can be used for imaging with a gamma camera or PET scanner to locate tumours. When paired with alpha or beta emitters, therapy can be achieved, as in PRRT. The current generation of PRRT targets somatostatin receptors, with a range of analogue materials such as octreotide and other DOTA compounds. These are combined with indium-111, lutetium-177 or yttrium-90 for treatment. 111In is primarily used for imaging alone, however in addition to its gamma emission there are also Auger electrons emitted, which can have a therapeutic effect in high doses.
Sources: en.wikipedia.org
Trials differ in patient population, dose schedule, background treatment, and the endpoints used to judge success. Many are small and single-center, so random variation can dominate the reported effects.
Authorization is limited to a small number of countries and covers specific indications such as chronic hepatitis B and vaccine adjuvant use. Availability and labelling differ by jurisdiction.
Most reviews describe it as an immunomodulatory agent with an uncertain clinical effect. They generally call for larger, better-controlled trials before firm conclusions are drawn.
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.