Everything below concerns Albumin binding. We keep the language plain, cite what the science says, and separate well-supported claims from open questions.
Last reviewed on 2026-05-07. Where a claim depends on a specific study, the study is described rather than over-claimed.
Development began in the 2010s, when researchers modified a GIP-based scaffold to add GLP-1 activity and then attached the fatty diacid to lengthen its half-life. Clinical evaluation proceeded through large phase 3 programmes in type 2 diabetes and in obesity, and regulators in the United States cleared the compound for type 2 diabetes in 2022 and for chronic weight management in 2023. Several cardiovascular and metabolic outcome studies are still reporting, so the picture of long-term benefit and risk is incomplete. Approvals in other regions followed on different timelines.
Tirzepatide is a synthetic peptide of 39 amino acids that carries a C20 fatty diacid side chain attached through a linker. Its molecular formula is C225H348N48O68, and its molecular weight is about 4813 daltons. The compound belongs to the incretin mimetic class and is administered by subcutaneous injection. The fatty acid chain promotes binding to serum albumin, which slows renal clearance and extends the circulation time of the molecule. It was identified during screening of sequences derived from glucose-dependent insulinotropic polypeptide.
溶解操作一般使用注射用水或适宜的水性缓冲液，必要时加入少量助溶剂以改善溶解速度，但应避免剧烈涡旋振荡，因为剪切力可能促进聚集。配制后的溶液在冷藏条件下的稳定时间通常短于固体形态，具体时限取决于浓度、缓冲体系与容器材质。是否加入防腐成分，则取决于用途是否为多次取样。
定量分析的主流方法是反相高效液相色谱联用紫外或质谱检测，利用肽在疏水固定相上的保留行为确定纯度与含量。对于生物基质中的浓度测定，常采用液相色谱串联质谱，并配合固相萃取或蛋白沉淀进行样品前处理。免疫分析法也可使用，但可能受到结构相关肽的交叉反应干扰。
| Property | Value | Notes |
|---|---|---|
| Molecular formula | C225H348N48O68 | Peptide backbone with a fatty diacid chain |
| Molecular weight | About 4813 Da | Calculated from the formula |
| Receptor targets | GIP and GLP-1 receptors | Dual agonist activity at both sites |
| Route of administration | Subcutaneous injection | No approved oral form at present |
| Elimination half-life | About 5 days | Supports extended intervals between administrations |
After subcutaneous injection, absorption is gradual, and peak plasma levels are generally reached within one to three days. Albumin binding extends the apparent half-life to roughly five days, which supports a weekly administration schedule. Metabolism proceeds mainly through proteolytic cleavage of the peptide backbone and beta-oxidation of the fatty acid chain, rather than through cytochrome P450 pathways. Eliminated fragments are largely recycled through general protein turnover, and excretion of intact drug in urine is minimal. These properties distinguish the molecule from short-acting incretin mimetics.
Tirzepatide is a synthetic peptide of 39 amino acids engineered from the native glucose-dependent insulinotropic polypeptide sequence. Its structure incorporates several non-natural residues and a C-terminal segment derived from glucagon-like peptide-1, together with a C20 fatty diacid moiety attached through a linker. The lipophilic side chain promotes binding to serum albumin, which slows renal clearance after administration. The compound is classified as a dual incretin receptor agonist and is supplied as a lyophilized powder for reconstitution or as a preformulated solution, depending on the presentation.
The peptide activates two G protein-coupled receptors, GIPR and GLP-1R. Binding triggers adenylyl cyclase activity and raises intracellular cyclic AMP in pancreatic beta cells, which potentiates insulin release when glucose is elevated. Signaling in the central nervous system is associated with reduced appetite and lower energy intake, while effects on gastric emptying and glucagon secretion are also reported. Because activity at both receptors is retained, the pharmacological profile is often described as incretin-based rather than selective for a single receptor.
An extended fatty diacid moiety promotes binding to serum albumin, which slows renal clearance and extends the circulating half-life to roughly five days. That property supports once-weekly administration and largely explains the dosing interval described in clinical reports. Published data come mainly from large randomised programmes that evaluated glycaemic control and body weight over periods of many months. Long-term outcomes beyond those trial windows, including what happens after treatment stops, remain an active area of investigation.
Tirzepatide is a synthetic peptide built from thirty-nine amino acids. Its sequence is derived from native glucose-dependent insulinotropic polypeptide, or GIP, with several non-natural residues and a fatty diacid side chain attached through a linker. The molecule behaves as a dual agonist at two incretin receptors, GIP and GLP-1, instead of targeting a single receptor. This dual engagement separates it from earlier single-receptor incretin compounds and underpins most of its reported pharmacological activity.
At the receptor level, the compound binds both GIP and GLP-1 receptors and triggers downstream signalling that raises cyclic AMP in target cells. GLP-1 receptor activation is associated with glucose-dependent insulin release, slower gastric emptying, and reduced appetite signalling. GIP receptor activation contributes effects that are less completely characterised, and how much each receptor adds to the overall clinical response is still an open question. The two pathways appear to interact in a complementary rather than a purely additive way.
Verification of research-grade material involves checking purity, sequence and counter-ion content against a certificate of analysis. Reported purity figures usually reflect chromatographic area percentage and do not by themselves establish biological activity. Independent laboratories may repeat mass confirmation and peptide mapping to detect substitutions or truncations. Open questions concern how residual solvents, trace metals and subtle conformational variants affect measured behavior, and how consistently different suppliers define their specifications. Documentation of analytical methods matters as much as the headline purity number when results are compared across studies.
Routine characterization relies on reversed-phase high-performance liquid chromatography, often coupled to mass spectrometry, to confirm identity and estimate purity. Peptide mapping after enzymatic digestion verifies the amino acid sequence and locates appended groups such as the fatty acid chain. Size-exclusion chromatography detects aggregates and fragments, while ion-exchange chromatography resolves charge variants. Circular dichroism and nuclear magnetic resonance supply secondary and higher-order structural information in research settings. No single technique covers every attribute, so laboratories combine orthogonal methods and compare outcomes against a reference standard where one exists.
Purified material is typically handled as a lyophilized powder kept at or below minus twenty degrees Celsius, shielded from light and moisture. In that state the solid remains stable for extended periods, although repeated freeze-thaw cycling can encourage aggregation. Once dissolved, aqueous solutions are less durable and are generally held cold and used within a brief window. Buffer composition, pH and ionic strength all influence degradation rates, and mildly acidic to neutral conditions are commonly examined. Actual shelf life depends on formulation, concentration and container, so stability limits are established experimentally rather than assumed.
Research-grade material circulates through suppliers that differ widely in documentation and testing practice, so a certificate of analysis is a starting point rather than proof of quality. Independent verification typically repeats chromatographic purity and mass confirmation on the received lot, and compares results against a retained reference standard. Regulatory status varies by jurisdiction, and a substance cleared as a medicine is not interchangeable with a research chemical of the same name. Open questions include how closely non-pharmaceutical lots match approved material in impurity profile and in aggregate content.
Solid tirzepatide is handled as a lyophilised, hygroscopic peptide powder that should be kept desiccated, protected from light, and stored frozen, typically at or below minus twenty degrees Celsius for long-term retention. Material left at ambient temperature for extended periods can take up moisture, which promotes aggregation and deamidation. Commercial liquid presentations are kept refrigerated between two and eight degrees Celsius and are not frozen. Reconstituted laboratory solutions are generally held cold and used within a short window because hydrolysis and oxidation continue slowly in solution.
Identity and purity are usually established with reversed-phase high-performance liquid chromatography for the main peak and with mass spectrometry for the observed molecular mass. Peptide mapping after enzymatic digestion confirms the primary sequence, while amino acid analysis provides a quantitative composition check. Size-exclusion chromatography and ion-exchange chromatography are used to look for aggregates and charge variants. Water content, residual solvents, and counter-ion content are measured separately, since a lyophilised powder is often reported on an as-is basis unless a correction is applied.
King Crimson toured to support both albums, including double bill shows with Tool. The tour was documented on the live album Heavy ConstruKction in 2000 and the Heaven & Earth (1997–2008) box set in 2019. Led Zeppelin bassist John Paul Jones and his band supported Crimson on some live shows. On 9 November 2001, King Crimson released a limited edition live EP called Level Five, featuring three new pieces: "Dangerous Curves", "Level Five" and "Virtuous Circle", plus versions of "The ConstruKction of Light" and ProjeKct's "The Deception of the Thrush", followed by an unlisted track called "ProjeKct 12th and X" after one minute of silence. A second EP followed in October 2002, Happy with What You Have to Be Happy With. This featured eleven tracks (including a live version of "Larks' Tongues in Aspic, Part IV"). Half of the tracks were processed vocal snippets by Belew, and the songs themselves varied between Soundscapes, gamelan, heavy metal and blues. The double duo line-up released King Crimson's thirteenth album, The Power to Believe, in March 2003. Fripp described it as "the culmination of three years of Crimsonising". The album incorporated, reworked and retitled versions of "Deception of the Thrush" ("The Power to Believe III"), tracks from their previous two EPs, and an extract from a Fripp Soundscape with added instrumentation and vocals, alongside "Level Five" (the final installment of the "Larks' Tongues in Aspic" suite). The Power to Believe reached No. 162 in the UK and No. 150 in the US.
Tea was first introduced to Western priests and merchants in China during the 16th century, at which time it was termed chá. The earliest European reference to tea, written as chiai, came from Delle navigationi e viaggi written by Venetian Giambattista Ramusio in 1545. The first recorded shipment of tea by a European nation was in 1607 when the Dutch East India Company moved a cargo of tea from Macao to Java, then two years later, the Dutch bought the first assignment of tea which was from Hirado in Japan to be shipped to Europe. Tea became a fashionable drink in The Hague in the Netherlands, and the Dutch introduced the drink to Germany, France, and across the Atlantic to New Amsterdam (New York). In 1567, Russian people came in contact with tea when Cossack leaders (atamans) Petrov and Yalyshev visited China. The Mongolian Khan donated to Tsar Michael I four poods (65–70 kg) of tea in 1638. According to Jeremiah Curtin, it was possibly in 1636 that Vassili Starkov was sent as envoy to the Altyn Khan. He was given 250 pounds of tea as a gift to the tsar. Starkov at first refused, seeing no use for a load of dead leaves, but the Khan insisted. Thus was tea introduced to Russia. In 1679, Russia concluded a treaty on regular tea supplies from China via camel caravan in exchange for furs. It is today considered the de facto national beverage.
The New York State Agricultural Experiment Station recipe for the concentrate suggests starting with 80 lb of sulfur, 36 lb of quicklime, and 50 gal of water, equivalent to 19.172 kg of sulfur and 8.627 kg of calcium oxide per 100 liters of water. About 2.2:1 is the ratio (by weight) for compounding sulfur and quicklime; this ratio yields the highest proportion of calcium pentasulfide. If calcium hydroxide (builders' or hydrated lime) is used, an increase of one-third or more (to 115 g/L or more) may be used with the 192 g/L of sulfur. If the quicklime is 85%, 90%, or 95% pure, 101 g/L, 96 g/L, or 91 g/L is used, respectively; if impure hydrated lime is used, its quantity is increased to compensate, though in practice lime with a purity lower than 90% is rarely used. The mixture is then boiled for one hour while being stirred, and small amounts of water are added for evaporation.
Mescaline has been isolated from numerous cactus species, including Echinopsis (Trichocereus), Gymnocalycium, Lophophora, Opuntia, Stenocereus, and Turbinicarpus species, among others. It occurs at the highest known concentrations in Lophophora williamsii (peyote), where it is highly variable but makes up 0.1 to 0.255% fresh weight and 0.9 to 6.3% of dry weight. Levels of mescaline are much lower in other Lophophora species. The compound also occurs in relatively high concentrations in various Echinopsis species, for instance Echinopsis pachanoi (San Pedro cactus), ranging from 0.02 to 0.12% fresh weight and 0.331 to 2.0% dry weight in this species. Mescaline occurs in only small or trace amounts in most other cactus species in which it has been detected.
Type I IFNs can induce expression of genes with either ISRE or GAS elements, but gene induction by type II IFN can occur only in the presence of a GAS element. In addition to the JAK-STAT pathway, IFNs can activate several other signaling cascades. For instance, both type I and type II IFNs activate a member of the CRK family of adaptor proteins called CRKL, a nuclear adaptor for STAT5 that also regulates signaling through the C3G/Rap1 pathway. Type I IFNs further activate p38 mitogen-activated protein kinase (MAP kinase) to induce gene transcription. Antiviral and antiproliferative effects specific to type I IFNs result from p38 MAP kinase signaling. The phosphatidylinositol 3-kinase (PI3K) signaling pathway is also regulated by both type I and type II IFNs. PI3K activates P70-S6 Kinase 1, an enzyme that increases protein synthesis and cell proliferation; phosphorylates ribosomal protein s6, which is involved in protein synthesis; and phosphorylates a translational repressor protein called eukaryotic translation-initiation factor 4E-binding protein 1 (EIF4EBP1) in order to deactivate it. Interferons can disrupt signaling by other stimuli. For example, interferon alpha induces RIG-G, which disrupts the CSN5-containing COP9 signalosome (CSN), a highly conserved multiprotein complex implicated in protein deneddylation, deubiquitination, and phosphorylation. RIG-G has shown the capacity to inhibit NF-κB and STAT3 signaling in lung cancer cells, which demonstrates the potential of type I IFNs.
Sources: en.wikipedia.org
In fungi, AAA is reduced to α‑aminoadipate-semialdehyde via AAA reductase (E.C 1.2.1.95) in a unique process involving both adenylation and reduction that is activated by a phosphopantetheinyl transferase (E.C 2.7.8.7). Once the semialdehyde is formed, saccharopine reductase (E.C 1.5.1.10) catalyses a condensation reaction with glutamate and NAD(P)H, as a proton donor, and the imine is reduced to produce the penultimate product, saccharopine. The final step of the pathway in fungi involves the saccharopine dehydrogenase (SDH) (E.C 1.5.1.8) catalysed oxidative deamination of saccharopine, resulting in L-lysine. In a variant AAA pathway found in some prokaryotes, AAA is first converted to N‑acetyl-α-aminoadipate, which is phosphorylated and then reductively dephosphorylated to the ε-aldehyde. The aldehyde is then transaminated to N‑acetyllysine, which is deacetylated to give L-lysine. However, the enzymes involved in this variant pathway need further validation.
. Therefore, thicker structures will appear preferentially in forward, and thinner ones in backward: since the SHG conversion depends at first approximation on the square of the number of nonlinear converters, the signal will be higher if emitted by thick structures, thus the signal in forward direction will be higher than in backward. However, the tissue can scatter the generated light, and a part of the SHG in forward can be retro-reflected in the backward direction. Then, the forward-over-backward ratio F/B can be calculated, and is a metric of the global size and arrangement of the SHG converters (usually collagen fibrils). It can also be shown that the higher the out-of-plane angle of the scatterer, the higher its F/B ratio (see fig. 2.14 of ).
The first berkelium metal sample weighing 1.7 micrograms was prepared in 1971 by the reduction of berkelium(III) fluoride with lithium vapor at 1000 °C; the fluoride was suspended on a tungsten wire above a tantalum crucible containing molten lithium. Later, metal samples weighing up to 0.5 milligrams were obtained with this method.
=== Structure === The proton pump, H+/K+ ATPase is a α,β-heterodimeric enzyme. The catalytic α subunit has ten transmembrane segments with a cluster of intramembranal carboxylic amino acids located in the middle of the transmembrane segments TM4, TM5, TM6 and TM8. The β subunit has one transmembrane segment with N terminus in cytoplasmic region. The extracellular domain of the β subunit contains six or seven N-linked glycosylation sites which is important for the enzyme assembly, maturation and sorting.
==== Gaeryang ganjang ==== Gaeryang-ganjang (개량간장, "modernized soy sauce"), referring to varieties of soy sauces not made of meju, is now the most widely used type of soy sauce in modern Korean cuisine. The word ganjang without modifiers in bokkeum (stir-fry), jorim (braised or simmered dishes), and jjim (steamed dishes) recipes usually mean gaeryang-ganjang. Another common name of gaeryang-ganjang is jin-ganjang (진간장, "dark soy sauce"), because gaeryang-ganjang varieties are usually darker in appearance compared to traditional hansik ganjang. Having been introduced to Korea during the era of Japanese forced occupation, garyang ganjang is also called Wae-ganjang (왜간장, "Wae soy sauce"). Korean Ministry of Food and Drug Safety's Food Code classifies gaeryang-ganjang into four categories by their method of production.
Sources: en.wikipedia.org
By public transport it is necessary to go to Rouen by train or bus (using No. 20 Green Bus). There is a Gray Coach to Étretat and Fécamp and there is VTNI for destinations in the Seine valley and Rouen who provide inter-urban services on behalf of the Department of Seine-Maritime. AirPlus provides a shuttle service to the railway stations and airports of Paris.
In men and women, the sole requirement for being considered a dwarf is having an adult height of 147 cm (4 ft 10 in) or less, and it is almost always sub-classified with respect to the underlying condition that is the cause of the short stature. Dwarfism is usually caused by a genetic variant; achondroplasia is caused by a mutation on chromosome 4. If dwarfism is caused by a medical disorder, the person is referred to by the underlying diagnosed disorder. Disorders causing dwarfism are often classified by proportionality. Disproportionate dwarfism describes disorders that cause unusual proportions of the body parts, while proportionate dwarfism results in a generally uniform stunting of the body. Disorders that cause dwarfism may be classified according to one of hundreds of names, which are usually permutations of the following roots:
== Further reading == A. Abragam (1961). The Principles of Nuclear Magnetism. Clarendon Press. ISBN 978-0-19-852014-6. {{cite book}}: ISBN / Date incompatibility (help) J.W. Akitt; B.E. Mann (2000). NMR and Chemistry. Cheltenham, UK: Stanley Thornes. pp. 273, 287. ISBN 978-0-7487-4344-5. K.V.R. Chary, Girjesh Govil (2008) NMR in Biological Systems: From Molecules to Human. Springer. ISBN 978-1-4020-6680-1. G.M. Clore; A.M. Gronenborn (1991). "Structures of larger proteins in solution: three- and four-dimensional heteronuclear NMR spectroscopy". Science. 252 (5011): 1390–1399. Bibcode:1991Sci...252.1390M. doi:10.1126/science.2047852. OSTI 83376. PMID 2047852. John Emsley; James Feeney; Leslie Howard Sutcliffe (1965). High Resolution Nuclear Magnetic Resonance Spectroscopy. Pergamon. ISBN 978-1-4831-8408-1. The Feynman Lectures on Physics Vol. II Ch. 35: Paramagnetism and Magnetic Resonance David M. Grant; Robin Kingsley Harris (2002). "Advances in NMR". Encyclopedia of Nuclear Magnetic Resonance. John Wiley. ISBN 978-0-471-49082-1. R.L. Haner; P.A. Keifer (2009). "Flow Probes for NMR Spectroscopy". Encyclopedia of Magnetic Resonance. John Wiley. doi:10.1002/9780470034590.emrstm1085. ISBN 978-0-470-03459-0. J.P. Hornak. "The Basics of NMR". Retrieved 23 February 2009. J. Keeler (2005). Understanding NMR Spectroscopy. John Wiley & Sons. ISBN 978-0-470-01786-9. Gary E. Martin; A. S. Zektzer (1988). Two-Dimensional NMR Methods for Establishing Molecular Connectivity. New York: Wiley-VCH. p. 59. ISBN 978-0-471-18707-3. J.A.Pople; W.G.Schneider; H.J.Bernstein (1959).
=== Alternative pathways === In plants and bacteria, the non-mevalonate pathway (MEP pathway) uses pyruvate and glyceraldehyde 3-phosphate as substrates to produce IPP and DMAPP. During diseases pathways otherwise not significant in healthy humans can come into use. For example, in one form of congenital adrenal hyperplasia a deficiency in the 21-hydroxylase enzymatic pathway leads to an excess of 17α-Hydroxyprogesterone (17-OHP) – this pathological excess of 17-OHP in turn may be converted to dihydrotestosterone (DHT, a potent androgen) through among others 17,20 Lyase (a member of the cytochrome P450 family of enzymes), 5α-Reductase and 3α-Hydroxysteroid dehydrogenase.
For nearly two years, however, Union generals in Kentucky consistently ignored orders to march on Knoxville, and instead focused on Middle Tennessee. On June 20, 1863, William P. Sanders's Union cavalry briefly laid siege to Knoxville, but a Confederate citizens' guard within the city managed to fend them off.
Sources: en.wikipedia.org
It is a synthetic 39-amino-acid peptide that acts on two incretin receptors, the GIP receptor and the GLP-1 receptor. It is given by subcutaneous injection and has a circulating half-life of roughly five days. It is not a small molecule and is not absorbed usefully from the gut in conventional oral form.
Selective agents act on one receptor, while tirzepatide engages both GIP and GLP-1 receptors. The added GIP activity may contribute effects on insulin sensitivity and on fat metabolism. Whether the dual action produces meaningful clinical advantages beyond differences in potency is still being examined.
The downstream consequences of GIP receptor activation are not fully characterised in humans. It is also unclear how much each receptor contributes to appetite reduction and to shifts in body composition. Published work describes associations and proposed pathways rather than settled causal chains.
建议在低温、避光、干燥环境中密封保存，常见条件为 2 至 8 摄氏度，长期存放可置于更低温度。应避免反复冻融，并尽量减少容器开启次数。