The short version of peptide backbone fits in a sentence. The long version — which is the one that helps — is below.
This page was last updated on 2026-07-12 and is reviewed periodically as new material appears.
The peptide backbone contains 39 amino acids and includes alpha-aminoisobutyric acid residues, which are not among the standard proteinogenic set. A C20 fatty diacid moiety is attached through a linker, allowing the compound to bind serum albumin and extend its circulation time. This albumin binding is the main reason the molecule supports once-weekly administration rather than more frequent dosing. The measured molecular mass is approximately 4,813 daltons, placing it firmly in the peptide rather than small-molecule class.
Tirzepatide is a synthetic peptide that activates both the glucose-dependent insulinotropic polypeptide (GIP) and glucagon-like peptide-1 (GLP-1) receptors. This dual agonist profile distinguishes it from earlier incretin-based compounds that act on a single receptor. The molecule was engineered from the native GIP sequence and carries several non-natural residues that slow enzymatic breakdown. Researchers designed it to combine the insulinotropic effects of GIP signaling with the appetite and gastric-emptying effects associated with GLP-1 activation.
Development of tirzepatide took place under a research program that sought to test whether simultaneous engagement of two incretin receptors would produce greater metabolic effects than single-receptor agonism. Clinical trials were organized into the SURPASS series for type 2 diabetes and the SURMOUNT series for obesity and weight management. Regulatory clearance for type 2 diabetes came in 2022 in the United States, followed by approval for chronic weight management in 2023. The trial programs reported reductions in glycated hemoglobin and body weight relative to comparators, though long-term cardiovascular and durability data continue to accumulate.
质量控制环节关注外观、含量、纯度、有关物质、水分与微生物限度等项目。检测结果需要有对照品和系统适用性数据支持，单次测定不足以判定批次的稳定性。实验室之间方法转移时，色谱柱品牌与梯度差异常导致保留时间漂移，因此方法验证十分必要。
固体状态的 tirzepatide 通常以冻干粉形式保存，推荐在低温、避光、干燥条件下存放，常见区间为 2 至 8 摄氏度，长期保存可考虑更低温度并避免反复冻融。冻融循环会导致肽链聚集或析出，从而影响后续定量结果。容器密封性与湿度控制同样是稳定性研究中反复强调的因素。
| Property | Value | Notes |
|---|---|---|
| Molecular class | Modified synthetic peptide | 39-residue backbone with non-natural residues |
| Receptor targets | GIP and GLP-1 | Dual incretin receptor agonist |
| Approximate molecular mass | 4,813 Da | Calculated from the peptide sequence |
| Administration route | Subcutaneous injection | Weekly schedule in approved products |
| Albumin binding | Present | Mediated by a C20 fatty diacid side chain |
In clinical research, tirzepatide has been studied in randomized controlled trials for glycemic control and body weight reduction. These trials typically measure changes in hemoglobin A1c and body weight over periods of several months. The drug is administered by subcutaneous injection, and its pharmacokinetic profile supports once-weekly dosing. Post-marketing surveillance continues to evaluate long-term outcomes and rare adverse events.
Tirzepatide is a synthetic peptide that acts as a dual agonist at the glucose-dependent insulinotropic polypeptide (GIP) and glucagon-like peptide-1 (GLP-1) receptors. The molecule contains 39 amino acids and features a C20 fatty diacid moiety attached via a linker, which promotes albumin binding and extends its circulating half-life. Its sequence incorporates non-natural amino acids and modifications that reduce susceptibility to degradation by dipeptidyl peptidase-4. This dual receptor activity distinguishes it from selective GLP-1 receptor agonists.
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.
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.
InterRidge Vents Database – global database of the locations of known active submarine hydrothermal vent fields, hosted by InterRidge Ocean Explorer – public outreach site for explorations sponsored by the US Office of Ocean Exploration Video by EV Nautilus Video by Schmidt Ocean
=== Crime === According to the City of Raleigh Crime Statistical Overview, in 2022, the Raleigh Police Department and other agencies in the city reported 1,797 incidents of violent crime and 11,537 incidents of property crime – making property crime about 24% higher than the national average and violent crime about 2% higher than the national average. Of the violent crimes reported, 43 were murders, 178 were rape/sexual assaults 458 were robberies, and 1,118 were aggravated assaults. Property crimes included burglaries which accounted for 1,191, larcenies for 9,018, and Motor vehicle theft accounted for 1,283 incidents out of the total.
As the evidence for most types of alternative medicine such as acupuncture is far from strong, the use of alternative medicine in regular healthcare can present an ethical question. Using the principles of evidence-based medicine to research acupuncture is controversial, and has produced different results. Some research suggests acupuncture can alleviate pain but the majority of research suggests that acupuncture's effects are mainly due to placebo. Evidence suggests that any benefits of acupuncture are short-lasting. There is insufficient evidence to support use of acupuncture compared to mainstream medical treatments. Acupuncture is not better than mainstream treatment in the long term. The use of acupuncture has been criticized owing to there being little scientific evidence for explicit effects, or the mechanisms for its supposed effectiveness, for any condition that is discernible from placebo. Acupuncture has been called "theatrical placebo", and David Gorski argues that when acupuncture proponents advocate "harnessing of placebo effects" or work on developing "meaningful placebos", they essentially concede it is little more than that. Medical doctors practicing acupuncture cannot agree upon the positions of acupuncture points, to the extent it has become meaningless to call them "points".
An eye dropper, also called Pasteur pipette or simply dropper, is a device used to transfer small quantities of liquids. They are used in the laboratory and also to dispense small amounts of liquid medicines. A very common use is to dispense eye drops into the eye. The commonly recognized form is a glass tube tapered to a narrow point (a pipette) and fitted with a rubber bulb at the top, although many styles of both plastic and glass droppers exist. The combination of the pipette and rubber bulb has also been referred to as a teat pipette. The Pasteur pipette name is from the French scientist Louis Pasteur, who used a variant of them extensively during his research. In the past, there was no equipment to transfer a chemical solution without exposing it to the external environment. The hygiene and purity of chemical compounds is necessary for the expected result of each experiment. The eye dropper, both glass and plastic types, can be sterilized and plugged with a rubber bulb at the open end of the pipette preventing any contamination from the atmosphere. Generally, they are considered cheap enough to be disposable, however, so long as the glass point is not chipped, the eye dropper may be washed and reused indefinitely.
Sources: en.wikipedia.org
As for the two cold wars thesis, the chief problem is that the two periods are incommensurable. To be sure, they were joined together by enduring ideological hostility, but in the post-World War I years Bolshevism was not a geopolitical menace. After World War II, in contrast, the Soviet Union was a superpower that combined ideological antagonism with the kind of geopolitical threat posed by Germany and Japan in the Second World War. Even with more amicable relations in the 1920s, it is conceivable that post-1945 relations would have turned out much the same. The usage of the term "Cold War" to describe the postwar tensions between the US- and Soviet-led blocs was popularized by Bernard Baruch, a US financier and an adviser to Harry Truman, who used the term during a speech before the South Carolina state legislature on April 16, 1947. Since the term "Cold War" was popularized in 1947, there has been extensive disagreement in many political and scholarly discourses on what exactly were the sources of postwar tensions. In the American historiography, there has been disagreement as to who was responsible for the quick unraveling of the wartime alliance between 1945 and 1947, and on whether the conflict between the two superpowers was inevitable or could have been avoided. Discussion of these questions has centered in large part on the works of William Appleman Williams, Walter LaFeber, Gabriel Kolko and John Lewis Gaddis.
Brendan Lee (born 9 September 1987) is a former professional Australian rules football player at the Essendon Football Club in the Australian Football League (AFL), and most notable for his long career with East Perth in the West Australian Football League (WAFL). Originally from East Perth, Lee made his senior WAFL debut in 2007 at age 19. By 2010, he was a regular senior player for the Royals, and he won the club's best and fairest award in 2011. After sixty games for the club and at age 24, he was recruited to the Australian Football League by Essendon with a late selection in the 2012 Rookie Draft (No. 78 overall). He played two senior games for Essendon during 2012, debuting in Round 20 against North Melbourne at Docklands Stadium, and played in the Victorian Football League for Essendon's VFL-affiliate Bendigo during the season. He was delisted at the end of the season, and returned to East Perth, where he won another club best and fairest in 2013 and became club captain. Lee, along with 33 other Essendon players, was found guilty of using a banned performance-enhancing substance, thymosin beta-4, as part of Essendon's sports supplements program during the 2012 season. He and his team-mates were initially found not guilty in March 2015 by the AFL Anti-Doping Tribunal, but a guilty verdict was returned in January 2016 after an appeal by the World Anti-Doping Agency. He was suspended for two years which, with backdating, ended in November 2016; as a result, he served approximately fourteen months of his suspension and missed the entire 2016 WAFL season.
== See also == Crystal structure prediction Dynamical system Memetics Metastability Ostwald's rule of stages Protein folding#Misfolded proteins Prion Protein folding#Energy landscape of protein folding Proteinopathy#Seeded induction Schild's Ladder Self-replicating machine Self-replication Strangelet#Potential propagation
==== Men's lacrosse ==== The lacrosse club team was founded in the mid-1960s. In the 1960s, Arizona was a Division I varsity program, coached by Carl Runk, an Arizona graduate and football player. In 1998, Runk retired after twenty-eight years at Towson University in Maryland.
=== Pharmacodynamics === MMDA has been shown to act as a non-neurotoxic serotonin releasing agent, with no effects on release of dopamine or probably norepinephrine, and as a serotonin 5-HT2A receptor agonist. The latter property is thought to be responsible for its psychedelic effects, whereas the former action may be involved in its entactogenic effects.
Sources: en.wikipedia.org
British soldiers were fed freshly cooked meals when in camp or barracks and troops on deployment could eat meals from field kitchens whenever possible, but soldiers were also reliant on rations. The British Army issued 24-hour rations intended to sustain troops until composite rations and fresh food could be supplied by field kitchens. An example of such a 24 hour ration pack issued to British and Commonwealth soldiers contained the following: 10 biscuits, two oatmeal blocks, milk, sugar, and tea blocks, four tablets of sugar, one block of meat, two pieces of raisin chocolate and one piece of plain chocolate, boiled sweets, one packet of salt, meat extract tablets, two packets of chewing gum, and four pieces of latrine paper. Composite rations, known as "compo" rations or 14-man rations, were designed to sustain 14 men for one day and came in wooden crates. A composite ration crate would include meats such as bully beef, sausage, spam, steak and kidney pudding, fruit pudding, treacle pudding, soup, beans, cheese, biscuits, jam, margarine, tea, powdered milk, and sugar. The composite ration was introduced at the end of the North African campaign to alleviate nutritional problems caused by Commonwealth rations in North African being largely bully beef and biscuits. Prior to its introduction tinned fruit had been introduced to improve nutrition. On the home front in Britain, mobile canteens were operated to provide Home Guard and civil defence authorities with hot food and fresh tea. A similar system applied to Canadian soldiers.
wrapped up the two-and-a-half-month Battle of Okinawa (which cost the lives of 260,000 people, including 150,000 civilians), it was faced with the prospect of invading the Japanese home islands in an operation codenamed Operation Downfall. Based on the U.S. casualties from the preceding island-hopping campaigns, American commanders estimated that between 50,000 and 500,000 U.S. troops would die and at least 600,000–1,000,000 others would be injured while invading the Japanese home islands. The U.S. manufacture of 500,000 Purple Hearts from the anticipated high level of casualties during the U.S. invasion of Japan gave a demonstration of how deadly and costly it would be. President Harry S. Truman realized he could not afford such a high casualty rate, especially since over 400,000 American combatants had already died fighting in both the European and the Pacific theaters of the war. On July 26, 1945, the United States, the United Kingdom, and the Republic of China issued a Potsdam Declaration that called for the unconditional surrender of Japan. It stated that if Japan did not surrender, it would face "prompt and utter destruction". The Japanese government ignored this ultimatum, sending a message that they were not going to surrender. In response to the rejection, President Truman authorized the dropping of the atomic bombs. At the time of its use, there were only two atomic bombs available, and despite the fact that more were in production back in mainland U.S., the third bomb wouldn't be available for combat until September.
=== Legal status === In September 2018, galcanezumab was approved in the United States for the preventive treatment of migraine in adults. The FDA granted the approval of Emgality to Eli Lilly. In November 2018, galcanezumab was approved for use in the European Union for the prophylaxis of migraine in adults who have at least four migraine days per month. In June 2019, galcanezumab was approved in the United States for the treatment of episodic cluster headache in adults. The application for galcanezumab was granted priority review and breakthrough therapy designations. In January 2021, AffaMed Therapeutics signed an agreement with Lilly to distribute galcenazumab in China. In December 2023, Organon signed an exclusive agreement with Lilly to distribute and commercialize galcanezumab in Europe. In August 2024, the agreement between Organon and Lilly was expanded to include a further 11 worldwide markets.
== Blood doping == Blood doping is the injection of red blood cells, related blood products that contain red blood cells, or artificial oxygen containers. This is done by extracting and storing one's own blood prior to an athletic competition, well in advance of the competition so that the body can replenish its natural levels of red blood cells, and subsequently injecting the stored blood immediately before competition. The resulting unnatural level of red blood cells improves oxygen transport and athletic endurance; thus, it is prohibited in most events. It is often used in extreme sports like cycling, snowboarding, and skiing where endurance is highly valued. The most famous example of this type of doping is Lance Armstrong's performance in the Tour de France.
Sources: en.wikipedia.org
It binds and activates both the GIP and GLP-1 receptors, making it a dual incretin receptor agonist. Single-receptor GLP-1 agonists act on one target only. The dual profile is the defining pharmacological feature of the molecule.
A fatty diacid side chain promotes reversible binding to serum albumin. This association slows renal clearance and protects the peptide from rapid enzymatic degradation. The result is a prolonged circulation time that supports weekly administration.
The first regulatory approval, for type 2 diabetes, was granted in the United States in 2022. An additional approval for chronic weight management followed in 2023. Availability and approved indications vary by country and are set by each national regulator.
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。