The short version of thymosin beta-4 fits in a sentence. The long version — which is the one that helps — is below.
Reviewed 2026-08-01. Anything still debated is marked as such rather than presented as settled.
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.
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.
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。
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。
| Property | Value | Notes |
|---|---|---|
| Molecular mass | Approximately 3,108 Da | Consistent with a 28-residue acetylated peptide |
| Residue count | 28 | Corresponds to the amino terminal region of prothymosin alpha |
| Appearance of dry powder | White to off-white solid | Slight variation between lots is normal |
| Solubility class | Freely soluble in water | Low solubility in most organic solvents |
| Common synonyms | Thymosin alpha 1, T alpha 1 | The numeral reflects an early fraction numbering scheme |
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。
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.
Clinical research has examined the peptide in chronic hepatitis B and C, as a vaccine adjuvant, and in sepsis and oncology settings. Results across trials have been mixed, and several studies were small or conducted under differing protocols. Regulatory status varies by country, and the compound is not approved in every jurisdiction where it is studied. Evidence for any single indication should be read with attention to sample size and endpoint choice.
Thymosin alpha-1 is a 28-residue peptide first isolated from thymus tissue in the 1970s. It corresponds to the N-terminal portion of thymosin beta-4, from which it is cleaved in vivo. The peptide carries an acetyl group at its N-terminus, a modification that affects its charge and stability. Synthetic material produced by solid-phase peptide synthesis is chemically identical to the natural fragment and is the form used in research and clinical studies.
CSL Limited is an Australian multinational specialty biotechnology company that researches, develops, manufactures, and markets products to treat and prevent serious human medical conditions. CSL's product areas include blood plasma derivatives, vaccines, antivenom, and cell culture reagents used in various medical and genetic research and manufacturing applications. The company was established in 1916 as Commonwealth Serum Laboratories and was wholly owned by the Australian federal government until its privatisation in 1994.
After a disciplinary hearing on Friday, 19 July 2013, FHM dismissed both men from their positions, calling their comments "entirely unacceptable". South Africa is a signatory of the Convention on the Elimination of All Forms of Discrimination Against Women (CEDAW), which obligates states to remove discriminatory barriers from the full and free exercise of rights by women. The convention's duty to modify the conduct of private citizens to ensure equality for women covers attitudes that include the inferiority of women and stereotyped gender roles, which arguably encompass the animus toward gay women that motivates many men to commit corrective rape. 66% of South Africa women said they did not report their attack because they would not be taken seriously. Of these, 25% said they feared exposing their sexual orientation to the police and 22% said they were afraid of being abused by the police. In August 2011, the Department of Justice established a National Task Team (NTT) to address the issue of hate crimes against LGBTQ people. In April 2014, then Minister of Justice Jeff Radebe launched a National Intervention Strategy for the LGBTI Sector developed by the NTT to address sex-based violence and gender-based violence against members of the community. The NTT has established a rapid response team to attend to unsolved criminal cases as a matter of urgency and produced an information pamphlet with frequently asked questions about LGBTI people.
There are two kinds of targeted drug delivery: active targeted drug delivery, such as some antibody medications, and passive targeted drug delivery, such as the enhanced permeability and retention effect (EPR-effect).
=== Baking powder === Malaysian authorities determined that ammonium bicarbonate, not milk, imported from China was the source of contamination at the Khong Guan and Khian Guan biscuit factory. Malaysian authorities said it was probable cross contamination of batches from Chinese companies Broadtech Chemical Int. Co Ltd, Dalian Chemical Industries and Tianjin Red Triangle International Trading Co, and did not suspect adulteration. On 19 October, Taiwanese authorities detected melamine in 469 tons of ammonium bicarbonate imported from China. Samples tested showed up to 2,470ppm of melamine.
Sources: en.wikipedia.org
Although 'a new departure', and notably indirect in its reference to the monarchy, it was criticised by nationalists and republicans for making any reference to the Crown, the claim being that it was a direct oath to the Crown, a fact arguably incorrect by an examination of its wording, but in 1922 Ireland and beyond, many argued that the fact remained that as a dominion the king (and therefore the British) was still head of state and that was the practical reality that influenced public debate on the issue. The Free State was not a republic. The Oath became a key issue in the resulting Irish Civil War that divided the pro and anti-treaty sides in 1922–23.
== History == Flavoproteins were first discovered in 1879 by separating components of cow's milk. They were initially called lactochrome due to their milky origin and yellow pigment. It took 50 years for the scientific community to make any substantial progress in identifying the molecules responsible for the yellow pigment. The 1930s launched the field of coenzyme research with the publication of many flavin and nicotinamide derivative structures and their obligate roles in redox catalysis. German scientists Otto Warburg and Walter Christian discovered a yeast derived yellow protein required for cellular respiration in 1932. Their colleague Hugo Theorell separated this yellow enzyme into apoenzyme and yellow pigment, and showed that neither the enzyme nor the pigment was capable of oxidizing NADH on their own, but mixing them together would restore activity. Theorell confirmed the pigment to be riboflavin's phosphate ester, flavin mononucleotide (FMN) in 1937, which was the first direct evidence for enzyme cofactors. Warburg and Christian then found FAD to be a cofactor of D-amino acid oxidase through similar experiments in 1938. Warburg's work with linking nicotinamide to hydride transfers and the discovery of flavins paved the way for many scientists in the 40s and 50s to discover copious amounts of redox biochemistry and link them together in pathways such as the citric acid cycle and ATP synthesis.
Thermolysin (EC 3.4.24.27, Bacillus thermoproteolyticus neutral proteinase, thermoase, thermoase Y10, TLN) is a thermostable neutral metalloproteinase enzyme produced by the Gram-positive bacteria Bacillus thermoproteolyticus. It requires one zinc ion for enzyme activity and four calcium ions for structural stability. Thermolysin specifically catalyzes the hydrolysis of peptide bonds containing hydrophobic amino acids. However thermolysin is also widely used for peptide bond formation through the reverse reaction of hydrolysis. Thermolysin is the most stable member of a family of metalloproteinases produced by various Bacillus species. These enzymes are also termed 'neutral' proteinases or thermolysin -like proteinases (TLPs).
The young Appalachians reached elevations similar to today's Alps and Rockies—both of which are significantly younger mountain ranges—before 240 million years of natural erosion by water, wind, ice, and gravity gradually morphed them into the lower, rugged peaks typically seen today. Considering their extensive length, the Appalachians contain a diverse selection of biomes ranging from the temperate broadleaf and mixed Appalachian-Blue Ridge forest in the south to the boreal Eastern Canadian forest in the north. Conifers like red spruce and balsam fir dominate the north and high elevations, while deciduous trees like sugar maple and beech are more prevalent further south and oak-chestnut forests reign between. The climate ranges from humid subtropical to subarctic, with a few peaks in the Presidential Range of New Hampshire's White Mountains having a true tundra climate; many locations are also oceanic or humid continental. Mammals like black bear, white-tailed deer, squirrels, raccoons, and skunks are common throughout the range, while others like moose are more regionally limited. Birds, fish, shellfish, amphibians like salamanders, and other invertebrates are also abound in the profoundly ecologically diverse region. Once-largely extirpated species like the bobcat and coyote have also made a resurgence in recent years. The Appalachian Mountains are a barrier to east–west travel, as they form a series of alternating ridgelines and valleys oriented in opposition to most highways and railroads running east–west.
== Rice == From 2009 to 2019, Thailand's hom mali 105 (jasmine) rice has been declared the world's best rice five times. But in 2018, Cambodian Malys Angkor jasmine rice was the winner, and Vietnam's ST24 rice took top honours in 2019, causing panic among Thai rice producers as ST24 is half the price of Thai hom mali.
Sources: en.wikipedia.org
The neck of the emu is pale blue and shows through its sparse feathers. They have grey-brown plumage of shaggy appearance; the shafts and the tips of the feathers are black. Solar radiation is absorbed by the tips, and the inner plumage insulates the skin. This prevents the birds from overheating, allowing them to be active during the heat of the day. A unique feature of the emu feather is the double rachis emerging from a single shaft. Both of the rachis have the same length, and the texture is variable; the area near the skin is rather furry, but the more distant ends resemble grass. The sexes are similar in appearance, although the male's penis can become visible when he urinates and defecates. The plumage varies in colour due to environmental factors, giving the bird a natural camouflage. Feathers of emus in more arid areas with red soils have a rufous tint while birds residing in damp conditions are generally darker in hue. The juvenile plumage develops at about three months and is blackish finely barred with brown, with the head and neck being especially dark. The facial feathers gradually thin to expose the bluish skin. The adult plumage has developed by about fifteen months. The eyes of an emu are protected by nictitating membranes. These are translucent, secondary eyelids that move horizontally from the inside edge of the eye to the outside edge. They function as visors to protect the eyes from the dust that is prevalent in windy arid regions. Emus have a tracheal pouch, which becomes more prominent during the mating season.
=== Pharmacokinetics === Carbetocin is to be used in the hospital by prescription only. It can be administered intravenously or intramuscularly. In both cases, the recommended dose for an average adult female is 100 micrograms. Contractile effects of the uterus are apparent within two minutes and can be observed for approximately one hour, though maximum binding occurs about 30 minutes after intramuscular injection. Administration is performed immediately following parturition to minimize risk of postpartum hemorrhage by inducing uterine contractions, increasing muscle tone and thickening the blood. If further uterine stimulation is needed, treatment with other forms of oxytocic uterotonic drugs should be used. Endogenous and synthetic oxytocin has a half-life of approximately 3.5 minutes. Carbetocin, in comparison, has a much longer half-life ranging from 85 to 100 minutes. The bioavailable dose is around 80%. The elimination half-life following intravenous administration is around 40 minutes, though the elimination mechanism is not entirely known. Studies have shown that elimination is only minimally renal (0.7%), but may occur at least partially through enzymatic degradation of peptides, primarily on the C-terminal end. Both elimination and volume of distribution are not dose dependent.
Art to be viewed from space – The Nazca Lines were created by the ancient Nazca culture in modern-day Peru. The Nazca built these artworks, which could only be viewed from the sky or from space. It was as if the Nazca were building monuments, which only their gods could view from up in the sky. Some of these artworks, otherwise known as the Nazca Lines, could only be viewed from the sky and each one of these works of Nazca art spans several miles across in size and dimension in the Sechura Desert. Aqueducts – The ancient Andean cultures, such as Chimu, Moche and Nazca, lived in dry environments, yet they sustained large scale agriculture consisting of a wide variety of crops by employing aqueducts connecting various freshwater sources, such as mountain streams and lakes to their agricultural fields which were sometimes injecting pressure with the aid of puquios (wind-based water pumps). The Inca later expanded on these previously constructed aqueducts and built a more complex and large aqueduct system in the Inca Empire. The Mesoamerican Aztecs also constructed complex, dual-pipe aqueducts to supply their vast city of Tenochtitlan. Aspirin – Indigenous Americans have been using willow tree bark for thousands of years to reduce fever and pain as were the peoples of Assyria, Sumer, Ancient Egypt and Ancient Greece. When chemists analyzed willows in the last century, they discovered salicylic acid; the basis of the modern drug aspirin.
=== EC 2.7.2: Phosphotransferases with a carboxy group as acceptor === EC 2.7.2.1: acetate kinase EC 2.7.2.2: carbamate kinase EC 2.7.2.3: phosphoglycerate kinase EC 2.7.2.4: aspartate kinase EC 2.7.2.5: Now EC 6.3.4.16, carbamoyl-phosphate synthase (ammonia) EC 2.7.2.6: formate kinase EC 2.7.2.7: butyrate kinase EC 2.7.2.8: acetylglutamate kinase EC 2.7.2.9: Now EC 6.3.5.5, carbamoyl-phosphate synthase (glutamine-hydrolysing) EC 2.7.2.10: phosphoglycerate kinase (GTP) EC 2.7.2.11: glutamate 5-kinase EC 2.7.2.12: acetate kinase (diphosphate) EC 2.7.2.13: Now known to be due to the activities of EC 6.1.1.17, glutamate—tRNA ligase, EC 1.2.1.70, glutamyl-tRNA reductase and EC 5.4.3.8 glutamate-1-semialdehyde 2,1-aminomutase EC 2.7.2.14: branched-chain-fatty-acid kinase EC 2.7.2.15: propionate kinase EC 2.7.2.16: 2-phosphoglycerate kinase EC 2.7.2.17: [amino-group carrier protein]-L-2-aminoadipate 6-kinase EC 2.7.2.18: fatty acid kinase
Sources: en.wikipedia.org
The name reflects an early convention for naming thymus-derived fractions. The peptide is characterized and measured as a defined molecule, and it does not operate through a single classical endocrine axis.
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。
目前认为它可能通过Toll样受体等模式识别受体传递信号，但精确的受体身份和结合机制尚未完全阐明。
不同试验在患者选择、给药方案、联合治疗和终点定义上差异很大。这些异质性使得跨研究比较困难，结论难以统一。