Everything below concerns glucose-dependent. We keep the language plain, cite what the science says, and separate well-supported claims from open questions.
Updated 2025-12-16. Numbers and descriptions here follow the published literature rather than marketing material.
Serum protein binding dominates the pharmacokinetic profile. The attached chain associates strongly with albumin, shielding the peptide from enzymatic attack and slowing filtration by the kidney. This interaction extends the circulation half-life to roughly one week in humans, which supports weekly administration intervals. An oral version pairs the peptide with an absorption enhancer that transiently alters gastric epithelium, permitting limited uptake; bioavailability by that route is substantially lower than by injection.
Semaglutide belongs to the glucagon-like peptide-1 receptor agonist class, a group of synthetic peptides that imitate an incretin hormone released by intestinal L cells after food intake. Native GLP-1 circulates for only a few minutes because dipeptidyl peptidase-4 cleaves it rapidly. The hormone acts on pancreatic islets, the gastrointestinal tract, and several brain regions. Because the natural peptide is short-lived, development work concentrated on analogues that keep receptor activity while resisting enzymatic breakdown and renal clearance.
The company that developed the compound filed it as a long-acting analogue, and it gained first approval in 2017 for type 2 diabetes. Later authorisations from several regulators extended the indication to chronic weight management, and the World Health Organization added the glucagon-like peptide-1 receptor agonist drug class to its model list of essential medicines in 2023. Production uses solid-phase peptide synthesis followed by side-chain conjugation and chromatographic purification. Supply constraints and cost differences across regions are well documented. Literature on long-term outcomes continues to grow, with many trials reporting surrogate endpoints rather than hard clinical endpoints.
Semaglutide is a synthetic peptide of thirty-one amino acids that shares roughly ninety-four percent sequence identity with human glucagon-like peptide-1. Two substitutions resist enzymatic cleavage by dipeptidyl peptidase-4, and a fatty diacid side chain attached through a linker promotes binding to serum albumin. That albumin binding slows renal clearance and extends the circulating half-life from minutes to approximately one week. The structural changes are well established in the published literature. Whether the same modifications affect receptor signalling bias in ways that matter clinically remains an open question.
Pharmacological activity arises from agonism at the glucagon-like peptide-1 receptor, a G protein-coupled receptor expressed in the pancreas, the gastrointestinal tract, and the brainstem. Receptor activation raises intracellular cyclic adenosine monophosphate and enhances insulin release in a glucose-dependent manner, an effect that diminishes when blood glucose concentration is low. Other effects include slowed gastric emptying and hypothalamic satiety signalling. These pathways are described well. Receptor desensitisation rates across tissues, relative to the endogenous hormone, are still under investigation, and reported findings differ between laboratories.
| Property | Value | Notes |
|---|---|---|
| Molecular class | Synthetic peptide, GLP-1 receptor agonist | 31 amino acid residues |
| Molecular formula | C187H291N45O59 | free peptide, no counter-ion |
| Approximate mass | 4114 Da | matches theoretical value |
| Receptor target | Glucagon-like peptide-1 receptor | Gs-coupled, cyclic AMP pathway |
| Circulation half-life | About one week in humans | extended by albumin association |
Reverse-phase high-performance liquid chromatography with ultraviolet detection near 214 or 280 nanometres is widely used to assess purity and to resolve related impurities. Liquid chromatography coupled to mass spectrometry confirms identity through the protonated molecular ion and fragment ions formed in tandem experiments. Capillary electrophoresis and peptide mapping after enzymatic digestion supply complementary information on charge variants and modification sites. Circular dichroism and nuclear magnetic resonance can report on secondary structure in solution. Absolute quantification usually depends on an external standard, and reported purity depends on the detection wavelength and integration parameters chosen.
Lyophilised material appears as a white to off-white cake or powder that is hygroscopic, and containers are usually equilibrated to room temperature before opening to limit condensation. Dissolution is performed in water, phosphate-buffered saline, or a mildly alkaline buffer, since solubility rises above neutral pH. Gentle inversion or low-speed mixing is preferred, because vigorous vortexing can promote surface denaturation and aggregation. Complete dissolution may require several minutes, and brief sonication is sometimes applied. Passing the solution through a 0.22 micrometre membrane removes particulates but does not by itself sterilise the liquid.
Storage at minus 20 degrees Celsius or lower in a desiccated container preserves the peptide for extended periods, while working solutions are commonly held at two to eight degrees Celsius for short intervals. Light exposure and repeated freeze-thaw cycles accelerate degradation, so dividing material into single-use aliquots is generally recommended. Adsorption to glass and plastic surfaces can lower the measured concentration of dilute solutions, particularly below one milligram per millilitre. The degradation routes most often reported for GLP-1 analogues are deamidation, methionine oxidation, and backbone hydrolysis. Relative rates under specific conditions are frequently described only for individual formulations.
序列层面的改动同时解决了两个问题，即酶解稳定性与肾脏清除速度。天然 GLP-1 在循环中的半衰期仅约两分钟，主要被二肽基肽酶-4 迅速灭活。酰化侧链与白蛋白的可逆结合形成循环储库，使分子缓慢释放并持续激活受体。这种设计思路后来被广泛用于同类长效肽的开发，属于该类药物化学改造的典型范式。
Semaglutide 是一种经结构修饰的胰高血糖素样肽-1 类似物，其主链与内源性 GLP-1(7-36) 约有百分之九十四的序列一致性。第 8 位丙氨酸被 α-氨基异丁酸取代，使二肽基肽酶-4 无法识别原有切割位点。第 34 位赖氨酸换为精氨酸，进一步降低酶解速率。第 26 位赖氨酸经间隔基连接一条含十八个碳的二酸脂肪链，该侧链赋予分子与血浆白蛋白结合的能力。
该分子作为 GLP-1 受体的选择性激动剂发挥作用，受体属于 B 类 G 蛋白偶联受体家族，激活后经 Gs 通路提升细胞内环腺苷酸水平。在胰腺 β 细胞，信号促进葡萄糖依赖性的胰岛素释放，血糖偏低时该作用明显减弱。在胰岛 α 细胞，胰高血糖素分泌受到抑制。中枢神经系统与胃肠道同样存在受体表达，相应信号参与食欲调节以及胃排空速率的降低。
Two structural features account for the prolonged half-life of semaglutide. A modified amino acid at position 8 resists cleavage by dipeptidyl peptidase-4, the enzyme that rapidly degrades native GLP-1. A fatty diacid side chain binds serum albumin, which limits renal clearance and protects the peptide from enzymatic breakdown. These modifications yield a plasma half-life of approximately one week in humans, allowing once-weekly administration. The relationship between plasma concentration and clinical effect varies between individuals, and sources of that variability are still being characterized.
Semaglutide is a synthetic peptide analog of glucagon-like peptide-1 (GLP-1), a hormone released from intestinal L-cells after food intake. The compound belongs to the incretin mimetic class and acts at GLP-1 receptors distributed across pancreatic, gastrointestinal, cardiovascular, and central nervous system tissues. Compared with native GLP-1, the molecule carries structural changes that extend its activity from minutes to roughly one week. It is studied for glycemic control in type 2 diabetes and for weight management, and its effects on cardiovascular and other outcomes remain active research areas.
Receptor binding triggers G protein signaling that raises intracellular cyclic AMP in pancreatic beta cells. Insulin release follows in a glucose-dependent manner, so secretion increases when blood glucose is elevated and diminishes when it is not. The same signaling suppresses glucagon release from alpha cells and slows gastric emptying, which blunts the post-meal glucose rise. In the brain, receptor activation in regions such as the arcuate nucleus is associated with reduced appetite and lower energy intake. How much each of these effects contributes to overall weight change is not fully settled.
=== Companies === Micro-Star International, a Taiwanese information technology company Midwest Scientific Instruments, a defunct American computer company Morgan Stanley (Broker ID), an American financial services company Motorola Solutions (NYSE: MSI), an American data communications and telecommunications equipment provider Movie Star (company) (AMEX: MSI), an American clothing manufacturer
Activation of this M2 receptor then activates a protein called a G-protein (in particular Gi protein, i for inhibitory). Activation of this G-protein blocks the cAMP pathway, reducing its effects, therefore inhibiting sympathetic activity and slowing action potential production. The G-protein also activates a potassium channel GIRK-1 and GIRK-4, which allows K+ to flow out of the cell, making the membrane potential more negative and slowing the pacemaker potential, therefore decreasing the rate of action potential production and therefore decreasing heart rate. A decrease in heart rate is known as negative chronotropy. The first cell to produce the action potential in the SA node isn't always the same; this is known as pacemaker shift. In certain species of animals—for example, in dogs—a superior shift (i.e., the cell that produces the fastest action potential in the SA node is higher than previously) usually produces an increased heart rate whereas an inferior shift (i.e. the cell producing the fastest action potential within the SA node is further down than previously) produces a decreased heart rate.
The reactions that produce, consume, and regenerate SAM are called the SAM cycle. In the first step of this cycle, the SAM-dependent methylases (EC 2.1.1) that use SAM as a substrate produce S-adenosyl homocysteine as a product. S-Adenosyl homocysteine is a strong negative regulator of nearly all SAM-dependent methylases despite their biological diversity. The S-adenosyl homocysteine is hydrolysed to homocysteine and adenosine by S-adenosylhomocysteine hydrolase and the homocysteine recycled back to methionine through transfer of a methyl group from 5-methyltetrahydrofolate, by one of the two classes of methionine synthases (i.e. cobalamin-dependent or cobalamin-independent). This methionine can then be converted back to SAM, completing the cycle. In the rate-limiting step of the SAM cycle, MTHFR (methylenetetrahydrofolate reductase) irreversibly reduces 5,10-methylenetetrahydrofolate to 5-methyltetrahydrofolate.
=== 6th Congress – CLP disbands (1993) === On January 31, 1993, at the Sixth Congress, the CLP voted unanimously to disband. This proposal was thoroughly discussed leading up to the 6th Congress. While many members initially had serious questions about the move to disband, they were eventually won over. One of the main arguments was that the CLP had failed to recruit new people and grow. Members believed that the organizational form of the CLP was not conducive to the further development of the revolutionary process. The "Call for the 6th Party Congress” (Rally, Comrades! Nov. 1992) raised the question, "What is the proper organizational form for revolutionaries in this quantitative stage of the revolution?” The Call states, "… this is not a time of preparation for the seizure of power. This is the moment to organize and politicize the social revolution. This is a time to struggle for the unity and political clarity of the millions who are in the diverse and daily struggle for jobs, health care and the other necessities of their lives.
== Development == C. brunneus are hemimetabolous. Females lay eggs over a 10-week period in the soil. Eggs hatch as early as April. Hatchlings typically go through four nymphal stages before becoming adults. Adults can live into the late autumn.
Sources: en.wikipedia.org
Daveigh Elizabeth Chase ( də-VAY; née Chase-Schwallier; July 24, 1990 – June 16, 2026) was an American actress. Chase began her acting career as a child, portraying Samantha Darko in the psychological thriller film Donnie Darko (2001) and Samara Morgan in the American remake of the horror film The Ring (2002). She also provided the English dub voice of Chihiro Ogino in the Studio Ghibli film Spirited Away (2001) and voiced Lilo Pelekai in the Disney animated film Lilo & Stitch (2002) and its related media franchise. She later took on adult roles, including in the HBO drama series Big Love (2006–2011) and independent films such as Yellow (2012) and Jack Goes Home (2016). Chase received three awards from six nominations, including an Annie Award for Outstanding Achievement for Voice Acting and an MTV Movie Award for Best Villain. Chase retired from acting in 2016 and later died on June 16, 2026 from complications associated with AIDS.
After a dispute with Yale over his forced retirement and the rights to his invention of electrospray ionization, Fenn moved to Richmond, Virginia to join Virginia Commonwealth University's (VCU) department of chemistry as an analytical chemistry professor. VCU established an engineering department in the late 1990s, and Fenn held a joint professorship between the two departments until his death. Even in his 80s, Fenn enjoyed the opportunity to be in the lab doing research, saying, "I like to mingle and exchange with the young people. It gets me out from underfoot at home."
Following Alice in Chains' extensive 1993 world tour, Staley said the band "just wanted to go into the studio for a few days with our acoustic guitars and see what happened." "We never really planned on the music we made at that time to be released. But the record label heard it and they really liked it. For us, it was just the experience of four guys getting together in the studio and making some music." Columbia Records released Alice in Chains' second acoustic-based EP, Jar of Flies, on January 25, 1994. Written and recorded in one week, Jar of Flies debuted at number one on the Billboard 200, becoming the first EP—and first Alice in Chains release—to top the charts. Paul Evans of Rolling Stone called the EP "darkly gorgeous", and Steve Huey said, "'Jar of Flies' is a low-key stunner, achingly gorgeous and harrowingly sorrowful all at once." Jar of Flies features Alice in Chains' first number-one single on the Mainstream Rock charts, "No Excuses". The second single, "I Stay Away", reached number ten on the Mainstream rock charts, while the final single "Don't Follow", reached number 25. Jar of Flies has been certified triple platinum by the RIAA, with over 2 million copies sold in the United States during its first year. Jar of Flies received two Grammy nominations, Best Hard Rock Performance for "I Stay Away", and Best Recording Package. After the release of Jar of Flies, Staley entered rehab for heroin addiction.
Some viewed this report as inaccurate and alarmist, claiming that it did not properly take into account many factors, such as possible actions that the Colombian state and the U.S. might take in response to the situation, nor the effects of the existence of paramilitary groups. Also during this period, paramilitary activities increased both legally and illegally. The creation of legal CONVIVIR self-defense and intelligence gathering groups was authorized by Congress and the Samper administration in 1994. Members of CONVIVIR groups were accused of committing numerous abuses against the civilian population by several human rights organizations. The groups were left without legal support after a 1997 decision by the Colombian Constitutional Court, which restricted many of their prerogatives and demanded stricter oversight. However, in April 1997, pre-existing paramilitary forces and several former CONVIVIR members were joined to create the AUC, a large paramilitary militia closely tied to drug trafficking which carried out attacks on the FARC and ELN rebel groups as well as civilians, starting with the 1997 Mapiripán Massacre. The AUC, originally present around the central/northwest part of the country, executed a series of raids into areas of guerrilla influence, targeting those whom they considered to be guerrillas or their supporters. This resulted in a continuing series of massacres.
==== Wound dressings ==== Chitosan-containing wound dressings have been widely explored for a variety of acute and chronic wounds. Chitosan is used within some wound dressings to decrease bleeding. Upon contact with blood, the bandage becomes sticky, effectively sealing the laceration. There are many ways to incorporate chitosan into wound dressings:
Sources: en.wikipedia.org
Recent studies aimed at measuring and valuing the hidden costs of agrifood systems have used True Cost Accounting (TCA), an accounting approach that measures and values the hidden impacts of economic activities on the environment, society and health. These impacts are regarded as hidden because they are not reflected in the market prices of products and services, i.e. not included in the operational profit and loss accounts.
Leaders reaffirmed support for Ukraine's sovereignty and territorial integrity, agreed to increase deliveries of air defence systems, interceptors and long-range capabilities, and said they would strengthen sanctions on Russia, including in the oil and gas sectors. The statement also supported Ukraine's energy resilience through the following winter and said G7 members were ready to consider extending licences to increase Ukrainian military production. The statement on the Middle East welcomed the announcement of a deal between the United States and Iran and said G7 members were ready to contribute to its implementation. It also supported efforts to resume maritime traffic through the Strait of Hormuz and called for diversified energy supply routes and higher energy stocks. It also supported efforts to disarm Hezbollah in Lebanon, accelerate humanitarian and reconstruction efforts in Gaza, and end violence in the West Bank.
Using the co-ordinates of the subunits and segments to determine the topographic location of the defect on the nose, the plastic surgeon plans, maps, and executes a rhinoplasty procedure. The unitary division of the nasal topography permits minimal, but precise, cutting, and maximal corrective-tissue coverage, to produce a functional nose of proportionate size, contour, and appearance for the patient. Hence, if more than 50 percent of an aesthetic subunit is lost (damaged, defective, destroyed) the surgeon replaces the entire aesthetic segment, usually with a regional tissue graft, harvested from either the face or the head, or with a tissue graft harvested from elsewhere on the patient's body.
== See also == World Institute of Kimchi – South Korean food R&D organization Foods containing tyramine – Trace aminePages displaying short descriptions of redirect targets Jangajji – Korean pickled vegetable dish Jeotgal – Korean salted seafood category Kimchi burger Korean radish – Variety of edible white radish Korean brining salt – Coarse salt Morkovcha – Koryo-saram spicy marinated carrot dish – a variety of kimchi made of carrots by Koryo-saram List of cabbage dishes List of English words of Korean origin List of pickled foods Pao cai – Pickle in Chinese cuisine. Sauerkraut – Finely sliced and fermented cabbage Torshi, also known as Tursu – Procedure of preserving food in brine or vinegarPages displaying short descriptions of redirect targets
Whey protein is commonly marketed as a dietary supplement, and various health claims have been attributed to it in the alternative medicine community. Although whey proteins are responsible for some milk allergies, the major allergens in milk are the caseins. Whey is the primary ingredient in most protein powders, which are used primarily by athletes and bodybuilders to obtain the necessary amounts of protein for muscle building/maintenance on a daily basis. Whey protein has a high level of leucine, one of the three branched-chain amino acids, making it ideal for muscle growth and repair. Whey is pasteurized to assure that no harmful bacteria are breeding in the liquid. It is heated to 70–80 °C (158–176 °F) and is then cooled back down to 4 °C (39 °F). Studies have shown that this process of using extreme temperatures eliminates 99.7% of bacteria without coagulating the protein into a solid mass. Next, the whey must be filtered, and so is loaded into a massive web of ceramic filters and stainless steel turbines. These machines work to separate out the lactose as well as the fats, leaving a liquid of 90% whey protein. Hydrolysates are whey proteins that are predigested and partially hydrolyzed for the purpose of easier metabolizing, but their cost is generally higher. Highly hydrolysed whey may be less allergenic than other forms of whey, due to the fact that the short chain peptides obtained by hydrolysis are less antigenic, because of the elimination of sequential epitopes.
Sources: en.wikipedia.org
It is a synthetic peptide of 31 amino acids, built to resemble the natural incretin hormone GLP-1. Because of its size and composition it is handled analytically like other therapeutic peptides, using chromatographic and mass spectrometric methods rather than the techniques typical of small organic drugs.
The substitution at position 8 removes the site recognised by dipeptidyl peptidase-4, the enzyme that destroys the native hormone within minutes. The linked lipophilic chain then binds circulating albumin, which further limits access by degradative enzymes and reduces renal loss. Together these features lengthen the effective circulation time considerably.
It acts at the glucagon-like peptide-1 receptor, a G protein-coupled receptor that signals mainly through cyclic AMP. Activation is glucose dependent, meaning insulin release is stimulated more strongly when blood glucose is already elevated. Other tissues carrying the same receptor respond as well, which explains effects beyond glucose control.
It is a glucagon-like peptide-1 receptor agonist, often grouped with the incretin mimetics. Its backbone is modified from the human hormone to resist enzymatic degradation and to bind albumin. These two features distinguish it from the native peptide.