This is a working overview of lyophilized powder, written for readers who want more than a one-paragraph summary but less than a textbook.
Reviewed 2025-08-12. Anything still debated is marked as such rather than presented as settled.
Laboratory work indicates that the peptide acts on cells of both the innate and adaptive immune systems. Reported effects include signalling through Toll-like receptors on dendritic cells, enhanced T-cell maturation, and increased natural killer cell activity. These actions are described largely from cell-culture and animal experiments, and the precise receptor-level events remain incompletely defined. Studies in humans have generally measured immune markers rather than a single defined molecular target. The resulting picture remains partly descriptive.
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.
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 |
|---|---|---|
| Chemical class | Peptide | 28 amino acid residues |
| Molecular weight | Approximately 3108 Da | Depends on acetylation state |
| N-terminal modification | Acetylated | Affects charge and stability |
| Natural source | Fragment of thymosin beta-4 | Cleaved in vivo |
| Sequence length | 28 residues | Synthetic form matches natural |
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。
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。
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。
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.
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.
Protein kinase N1 is responsible for the phosphorylation of the TNF receptor-associated factor (TRAF1) on serine 139 under specific conditions. Murine TRAF1 is also phosphorylated by the same kinase, which leads to the silencing of IKK/NF-κB activity. The elimination of phosphorylation on serine 139 can be achieved by the replacement of TRAF1 with an Alanine residue, which consequently leads to the improved recruitment of TBK1. At the serine 789 residue, FGFR1 is phosphorylated by RSK2 when the kinase is in its active form. The signaling capabilities of FGFR1 at the serine 777 site can be weakened by phosphorylation. Serine 1047 and serine 1048 have been linked to the decreased binding affinity of ubiquitin ligase c-Cbl to EFGR when they are phosphorylated. When serine 349 is phosphorylated, the binding affinity between protein complex p62 and the protein Keap1 is strengthened, which is linked to stress response. When serine 337 is phosphorylated by protein kinase A in vitro, the DNA binding efficiency of the p50 subunit of NF-κB is greatly increased. Phosphorylation of serine and threonine residues is known to crosstalk with O-GlcNAc modification of serine and threonine residues.
For example, human height is a trait with complex causes. It has a heritability of 89% in the United States. In Nigeria, however, where people experience a more variable access to good nutrition and health care, height has a heritability of only 62%.
After having conferred with the Transvaal leaders, de Wet returned to the Orange Free State, where he inspired successful attacks and raids in the western part of the country, though he suffered a defeat at Bothaville in November 1900. Many Boers who had returned to their farms and towns, sometimes after being given parole by the British, took up arms again. In late January 1901, De Wet led a renewed invasion of Cape Colony. This was less successful, because there was no general uprising among the Cape Boers, and De Wet's men were hampered by bad weather and pursued by British forces. They narrowly escaped across the Orange River. From then until the final days of the war, De Wet remained comparatively quiet, rarely attacking British army camps and columns partly because the Orange Free State was effectively left desolate by British sweeps. In December 1901, De Wet attacked and overran an isolated British detachment at Groenkop, inflicting heavy casualties and capturing over 200 British soldiers. This prompted Kitchener to launch the first of the "New Model" drives against him. De Wet escaped the first such drive but lost 300 of his fighters. This was a severe loss, and a portent of further attrition, although sweep attempts to round up De Wet were badly handled, and De Wet's forces avoided capture for the rest of the war.
==== MeSH D12.125.072 – amino acids, cyclic ==== MeSH D12.125.072.050 – amino acids, aromatic MeSH D12.125.072.050.342 – dextrothyroxine MeSH D12.125.072.050.685 – phenylalanine MeSH D12.125.072.050.685.400 – dihydroxyphenylalanine MeSH D12.125.072.050.685.400.180 – cysteinyldopa MeSH D12.125.072.050.685.400.500 – levodopa MeSH D12.125.072.050.685.400.600 – methyldopa MeSH D12.125.072.050.685.440 – fenclonine MeSH D12.125.072.050.685.450 – p-fluorophenylalanine MeSH D12.125.072.050.685.500 – melphalan MeSH D12.125.072.050.767 – thyroxine MeSH D12.125.072.050.767.741 – thyronines MeSH D12.125.072.050.767.741.180 – diiodothyronines MeSH D12.125.072.050.767.741.894 – triiodothyronine MeSH D12.125.072.050.767.741.947 – triiodothyronine, reverse MeSH D12.125.072.050.850 – tryptophan MeSH D12.125.072.050.850.479 – 5-hydroxytryptophan MeSH D12.125.072.050.875 – tyrosine MeSH D12.125.072.050.875.064 – betalains MeSH D12.125.072.050.875.064.500 – betacyanins MeSH D12.125.072.050.875.130 – dihydroxyphenylalanine MeSH D12.125.072.050.875.130.180 – cysteinyldopa MeSH D12.125.072.050.875.130.500 – levodopa MeSH D12.125.072.050.875.130.600 – methyldopa MeSH D12.125.072.050.875.262 – diiodotyrosine MeSH D12.125.072.050.875.379 – melanins MeSH D12.125.072.050.875.496 – monoiodotyrosine MeSH D12.125.072.050.875.664 – methyltyrosines MeSH D12.125.072.050.875.664.050 – alpha-methyltyrosine MeSH D12.125.072.050.875.750 – phosphotyrosine MeSH D12.125.072.170 – cycloleucine MeSH D12.125.072.200 – desmosine MeSH D12.125.072.329 – histidine MeSH D12.125.072.329.269 – ergothioneine MeSH D12.125.072.329.539 – methylhistidines MeSH D12.125.072.401 – imino acids MeSH D12.125.072.401.200 – azetidinecarboxylic acid MeSH D12.125.072.401.623 – proline MeSH D12.125.072.401.623.270 – captopril MeSH D12.125.072.401.623.374 – fosinopril MeSH D12.125.072.401.623.478 – hydroxyproline MeSH D12.125.072.401.761 – pyrrolidonecarboxylic acid MeSH D12.125.072.401.830 – technetium tc 99m diethyl-iminodiacetic acid MeSH D12.125.072.401.840 – technetium tc 99m disofenin MeSH D12.125.072.401.900 – technetium tc 99m lidofenin MeSH D12.125.072.415 – isodesmosine
Altitude related – Polycythemia can be a normal adaptation to living at high altitudes (see altitude sickness). Many athletes train at high altitude to take advantage of this effect, which can be considered a legal form of blood doping, although the efficacy of this strategy is unclear. Hypoxic disease-associated – for example, in cyanotic heart disease where blood oxygen levels are reduced significantly; in hypoxic lung disease such as COPD; in chronic obstructive sleep apnea; conditions that reduce blood flow to the kidney e.g. renal artery stenosis. Chronic carbon monoxide poisoning (which can be present in heavy smokers) and rarely methemoglobinemia can also impair oxygen delivery. Genetic – Heritable causes of secondary polycythemia include abnormalities in hemoglobin oxygen release, which results in a greater inherent affinity for oxygen than normal adult hemoglobin and reduces oxygen delivery to tissues. Conditions where the secondary polycythemia is not caused by physiologic adaptation, and occurs irrespective of body needs include:
Sources: en.wikipedia.org
Dynamic allele-specific hybridization (DASH) genotyping takes advantage of the differences in the melting temperature in DNA that results from the instability of mismatched base pairs. The process can be vastly automated and encompasses a few simple principles. In the first step, a genomic segment is amplified and attached to a bead through a PCR reaction with a biotinylated primer. In the second step, the amplified product is attached to a streptavidin column and washed with NaOH to remove the unbiotinylated strand. An allele-specific oligonucleotide is then added in the presence of a molecule that fluoresces when bound to double-stranded DNA. The intensity is then measured as temperature is increased until the melting temperature (Tm) can be determined. A SNP will result in a lower than expected Tm. Because DASH genotyping is measuring a quantifiable change in Tm, it is capable of measuring all types of mutations, not just SNPs. Other benefits of DASH include its ability to work with label free probes and its simple design and performance conditions.
Moore has criticized PJM Interconnection, the regional transmission organization that operates Maryland's power grid, arguing that its policies have delayed new clean energy projects at a time of increasing energy demand as a result of the AI boom. In November 2024, he expressed "grave concerns" with the Maryland Piedmont Reliability Project, a 70-mile power line proposed by PJM that would run from Frederick to Baltimore County to provide power to data centers in Maryland and Virginia, saying that the project lacked community input and effective communication about its impacts. In December 2025, Moore signed an executive order directing the Maryland Energy Administration to petition the Maryland Public Service Commission to assess whether current practices protect ratepayers from unexpected costs and to petition owners to consider advanced transmission technologies to increase the capacity and efficiency of existing grid infrastructure prior to earning approval for new power line construction. In January 2026, he endorsed a Trump administration proposal to slow energy price increases in the northeast United States through reforms to the region's power grid. During the 2025 legislative session, Moore introduced the ENERGIZE Maryland Act, which would expand nuclear power and other clean energy sources in the state. The ENERGIZE Act failed to pass, though many of its provisions—including those to speed up the process for procuring new nuclear energy—were added to the Next Generation Energy Act, which Moore signed into law in May 2025.
The UPMC Mercy South Side Outpatient Center, formerly UPMC South Side hospital, is a 209,000-square-foot (19,400 m2) urgent care and outpatient facility serving the South Side neighborhood of Pittsburgh. It is one of several UPMC outpatient medical facilities serving various communities throughout the region.
== History == Pentazocine was developed by the Sterling Drug Company, Sterling-Winthrop Research Institute, of Rensselaer, New York. The analgesic compound was first made at Sterling in 1958. U.S. testing was conducted between 1961 and 1967. It was approved by the Food and Drug Administration in June 1967 after being favorably reviewed following testing on 12,000 patients in the United States. By mid 1967 Pentazocine was already being sold in Mexico, England, and Argentina, under different trade names.
Sources: en.wikipedia.org
The Culture is a fictional interstellar post-scarcity society created by the Scottish writer Iain M. Banks and features in a number of his space opera novels and works of short fiction, collectively called the Culture series. The Culture is composed primarily of humanoid aliens, artificial intelligences (A.I.), and a number of other sentient life forms. The A.I. intelligence covers a spectrum; simple programs performing a specific function (e.g. controlling spacesuits), human-equivalent drones and hyper-intelligent Minds who organise and oversee the society. Beyond scarcity, the Culture has no need for money; instead, Minds organise society to maximise the well-being of its citizenry. The protagonists, almost always humanoids, are generally those who have chosen to work for the Culture's diplomatic or espionage organs and interact with other civilisations whose citizens act under different ideologies, morals, and technologies. The Culture generally has more advanced technology relative to most other civilisations it shares the galaxy with. Most of the Culture's citizens do not live on planets but in artificial habitats such as orbitals and ships, the largest of which are home to billions of individuals. The Culture's citizens have been genetically enhanced to live for as long as they desire and have modified mental control over their physiology, including the ability to introduce a variety of psychoactive drugs into their systems, change biological sex, or switch off pain at will.
=== Europe and the Mediterranean === In 2015 and 2016, the IUCN designated the white shark as critically endangered in European and Mediterranean waters, respectively. Several factors contributed to this designation, including the region's genetic isolation, the species' slow growth rate, a broad decline in large shark populations, and a persistent negative public perception. The IUCN suggests that fewer than 250 mature white sharks remain in European waters, with most concentrated in the Mediterranean. Research indicates a significant downward trend: a 2017 study noted a decrease in the average size of Mediterranean white sharks, a possible sign of a struggling population. A 2020 analysis of records from 1860 to 2016 found that while sightings peaked in the 1880s and 1980s, there has been a 61% decrease since 1975. Furthermore, a 2025 study reported only four sightings in the last decade, compared to an average of ten per year between 1985 and 1995. While there is no targeted commercial fishery, white sharks are often harpooned as perceived threats or as pests that interfere with fishing gear. The decline of prey like bluefin tuna and Mediterranean monk seals is also a major threat. The white shark is protected as an endangered species by every coastal Mediterranean nation under the Barcelona Convention of 1978 (amended in 1995), while in 2009, the European Commission banned their capture. An EU-funded program managed to successfully release a juvenile white shark caught as bycatch around Lampedusa in 2023.
An intermediate bulk container (IBC, IBC Tote, IBC Tank) is a multi-use container employed for the general transport, storage, and handling of bulk fluids and materials. IBC tanks are compatible with, and resistant to, an extensive list of chemicals, acids, caustics, as well as inert materials and food grade consumables. IBCs are commonly manufactured from the following materials:
===== Sendai virus cell entry receptor overexpression ===== Sendai virus cell entry receptors are often overexpressed in cancer cells. SeV receptors are potential biomarkers for evaluation of the vulnerability of malignant cells to the virus. They represented by glycoproteins and glycolipids (see section "SeV cell entry receptors").The expression of some molecules that can facilitate SeV cell entry (see section "SeV cell entry receptors"), frequently, accelerates carcinogenesis or metastasis development. For example, the presence of Sialyl-Lewisx antigen (cluster of differentiation 15s (CD15s)), which is one of SeV cell entry receptors, on the outer cell membrane, correlates with invasion potential of malignant cells, tumor recurrence, and overall patient survival for an extremely wide range of cancers. Therefore, SeV virus preferentially can enter such cells. Metastatic cancer cells frequently express a high density of glycoproteins or glycolipids – molecules that are rich in sialic acid. Expression of the Vim2 antigen, which is another SeV cell entry receptor, is very important for the extravascular infiltration process of acute myeloid leukemia cells. GD1a, ganglioside also serves as SeV receptor and is found in large quantities on the surfaces of breast cancer stem cells. High cell surface expression of another SeV receptor – ganglioside sialosylparagloboside /SPG/ NeuAcα2-3PG. characterizes lymphoid leukemia cells.
=== Oxygen therapy === In the 2011 IPF guidelines, oxygen therapy, or supplementary oxygen for home use, became a strong recommendation for use in those patients with significantly low oxygen levels at rest. Although oxygen therapy has not been shown to improve survival in IPF, some data indicate an improvement in exercise capacity.
Sources: en.wikipedia.org
It corresponds to the first 28 amino acids of thymosin beta-4, a larger protein found in many tissues. The fragment is acetylated at its N-terminus and is produced synthetically for research and pharmaceutical use. Synthetic and natural forms share the same sequence.
It is usually described as an immunomodulatory peptide rather than a classical hormone. It does not travel to a single distant organ in the manner of an endocrine hormone. Classification varies across sources, and some texts group it with thymic peptides generally.
The broad outline involves immune cell activation, but the specific molecular steps remain under investigation. Different studies report effects on dendritic cells, T cells, and natural killer cells. No single receptor has been confirmed as the sole mediator.
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.