If you have been reading about mass spectrometry and want a single page that covers the useful parts, this is it: definitions, context, how it is studied, and the questions that come up repeatedly.
Last reviewed on 2026-02-25. Where a claim depends on a specific study, the study is described rather than over-claimed.
The sequence contains an unusually high proportion of proline and glycine, which limits regular secondary structure and contributes to solubility in aqueous media. The compound dissolves readily in water and in normal saline. Because it is a peptide, digestive enzymes are expected to break it down if it is swallowed, a consideration that influences the routes of administration used in animal experiments. Detailed conformational data remain limited, and published structural models are largely computational.
BPC 157 is a synthetic peptide built from fifteen amino acids. The letters stand for body protection compound, and the number is a laboratory code rather than a description of any biological feature. Its single-letter sequence is GEPPPGKPADDAGLV, which corresponds to a calculated mass near 1419.5 daltons. The material is produced by solid-phase peptide synthesis and is distributed as a lyophilized powder, not as a purified extract from a natural source.
Identity and purity are established with complementary methods rather than one test. Reverse-phase high-performance liquid chromatography separates the main peak from deletion sequences and oxidized variants, and its area percentage is the usual purity figure. Mass spectrometry confirms the expected molecular mass and can flag truncations or modifications that chromatography alone might miss. Amino acid analysis and peptide mapping add sequence-level confirmation, while residual counter-ion and water content are measured separately.
A freeze-dried sample is generally the most stable form and is commonly held at minus twenty degrees Celsius or lower for long-term keeping, with brief transfers at room temperature. The solid is hygroscopic, so vials are warmed to ambient temperature before opening to prevent condensation from degrading the contents. Light exposure and repeated temperature cycling are both avoided in routine handling. Storage over a desiccant is a common laboratory practice that limits moisture uptake during repeated access.
Once dissolved, the material is considerably less stable than the dry solid. Aqueous solutions are usually kept cold and used within a short window, and neutral or mildly acidic buffers are preferred over strongly alkaline conditions. Freeze-thaw cycles promote aggregation and loss of material to container surfaces, so dividing a batch into single-use aliquots is standard. Adsorption to plastic and glass can lower the measured concentration, meaning solution strength may need rechecking before an experiment.
| Property | Value | Notes |
|---|---|---|
| Molecular weight | About 1419.5 Da | Calculated from the fifteen-residue sequence |
| Residue count | 15 amino acids | Single-letter sequence GEPPPGKPADDAGLV |
| Compound class | Synthetic peptide | Produced by solid-phase synthesis |
| Synonyms | BPC 157; pentadecapeptide BPC 157 | Naming varies across suppliers and papers |
| Appearance | White to off-white powder | Typical form of the lyophilized material |
Handling practice centers on limiting moisture, heat, and mechanical stress. Powder is typically allowed to reach room temperature before opening so that condensation does not form on the contents, and solutions are prepared with sterile or low-particulate water. Peptides can adsorb to certain plastics and membrane filters, so container and filter material is sometimes specified to reduce losses at low concentrations. Working aliquots are usually frozen separately rather than sampled repeatedly from one stock. Recording lot number, preparation date, and storage conditions supports later comparison between experiments.
Identity and purity are usually assessed by reversed-phase high-performance liquid chromatography, which separates the target peptide from truncated sequences and other synthesis by-products. Mass spectrometry, typically electrospray ionization coupled to liquid chromatography, confirms the expected mass and helps detect modifications. Amino acid analysis can verify composition when residue-level confirmation is needed. Because common impurities differ from the target by only one or two residues, chromatographic resolution often matters more than a single headline purity percentage. Impurity profiles are most informative when compared against a validated reference standard.
Lyophilized material is generally reported as stable for extended periods when kept cold, dry, and protected from light. In solution, the main degradation routes for a peptide of this type are hydrolysis of peptide bonds and aggregation. The sequence contains no cysteine, so disulfide-driven oxidation is not a primary concern, though methionine and tryptophan are also absent. Stability depends on pH, buffer composition, and concentration, with acidic conditions often reported as more favorable than neutral or alkaline ones. Repeated freeze-thaw cycles can promote aggregation, and how fast degradation proceeds at room temperature in specific formulations remains an open question.
The molecule carries 15 residues, a molar mass near 1419.5 g/mol, and the formula C62H98N16O22. Its structure features a proline-rich central region, a pair of adjacent aspartic acid residues, and no cysteine. The absence of cysteine means no disulfide bonds can form, which simplifies refolding and reconstitution. Suppliers usually ship the material as a freeze-dried powder that appears white to off-white. It dissolves readily in water and in saline solutions.
Published storage guidance follows general peptide practice rather than product-specific studies. The dry powder is typically kept at minus 20 degrees Celsius, away from light and moisture. Once reconstituted, solutions are generally refrigerated and used over days to weeks, because the aqueous environment slowly promotes hydrolysis and oxidation. Long-term data on degradation rates or breakdown products are sparse. Stated shelf lives from different producers vary widely, reflecting the absence of a shared reference standard.
BPC-157 is a synthetic peptide built from fifteen amino acid residues. Its sequence comes from a larger protein fragment that researchers isolated from human gastric juice and described as a body protection compound. The fragment contains glycine, glutamic acid, five prolines, lysine, alanine, two aspartic acids, leucine, and valine. The number 157 in the name refers to the position of the stretch within the parent protein. Material used in laboratories is manufactured rather than extracted from stomach fluid.
Most published studies examine BPC-157 in animal models rather than in humans. Common subjects include rats and mice, and researchers often use models of tissue injury, surgery, or induced inflammation. Reported endpoints include healing rates, blood vessel formation, and markers of tissue repair. These designs provide controlled comparisons, but findings in animals do not automatically transfer to people. Human clinical data remain limited and are frequently described as preliminary.
Doses in the literature are usually expressed in micrograms or nanograms per kilogram of body weight. Investigators have administered the peptide by several routes, including injection and oral delivery, depending on the question asked. Route and dose vary widely across studies, which complicates direct comparison of results. Many papers report effects at low doses, but the absence of a standardized protocol limits generalization. Reporting practice differs between research groups.
If compelling archaeological reasons for supposing that the ages come from exactly contemporary samples do not exist, then results must be regarded as suspect. If there exists no prior reason to believe that two samples are truly of the same age, and even if their ages are statistically indistinguishable, they are as likely to be as far apart in true age as the measured difference between them as they are to be of the same age. Charcoal was seen historically as an ideal medium for carbon dating. When long-lived tree species, such as oak and juniper, are used, however, there is a particular danger of encountering the "old wood" problem. For example, the date being measured may be from heartwood, which is already many centuries old by the time the tree was felled. Another difficulty is that of a possible time-lag between felling and final deposition. The timber may have had an extensive history of use and re-use. A method of ameliorating this problem is to date young growth, if available, for example hazel twigs. Dating of artefacts using accelerator mass spectrometry is the gold standard dating method of today; charcoal-sourced dates are seen as unreliable. In establishing the chronology of a site, a representative spread of dates is required before interpretation can be attempted.
Bill Gates said that criticizing pharmaceutical company pricing deterred them from investing in medicines for the developing world, and said that instead, pharmaceutical companies should be praised for price discrimination which reduces the price in poor countries. He also advocated improving low-temperature supply chains (a.k.a. cold chains) in developing countries. In August 2019, MSF asked Gavi to stop giving Advance Market Commitment subsidies to GSK and Pfizer, whom they called a duopoly, and instead buy vaccine from a new third manufacturer, the Serum Institute of India, which offered the vaccine at 2/3 of the price then offered by the two. As the pneumococcal vaccine made up 40% of Gavi's vaccine purchasing costs, a 33% price drop would save Gavi billions (13% of its total vaccine purchasing costs). Pneumonia kills more than a quarter of children dying before the age of five, almost a million children each year. MSF said that GSK and Pfizer's pricing was exploitative and had left millions of children who could have been protected vulnerable. Gavi responded that low prices required large, stable, high-volume deals, and "careful consideration and the support of key constituencies". In June 2020, under Gavi's Advance Market Commitment, UNICEF and the Serum Institute of India entered an agreement which reduced the price of pneumococcal conjugate vaccines to $2 per dose.
The UK provides the Operational Ration Pack, General Purpose. Packed inside a small cardboard box, each ration has enough retort-pouched and canned foods to feed one soldier for 24 hours. Seven menus (plus vegetarian and religious variants) provide two precooked meals (Breakfast and Main Meal) plus a midday snack. Example (Menu A) Breakfast: Hamburger and beans, Instant Porridge. All ration packs also contain Oatmeal Block, Fruit Biscuits, Biscuits Brown (a more compact alternative to bread), a sachet of instant soup and jam or yeast extract (a Marmite like spread) for a lunchtime snack, and chocolate (in the form of a specially made Yorkie bar which is flatter than civilian bars, or, more recently, a simple unbranded bar of milk chocolate), though this has been phased out with the introduction of the more recent multi-climate ration packs, and boiled sweets (hard candy) for snacking whilst on patrol, or in free time. Main Meal: Instant soup, Chicken with Mushroom and Pasta, Treacle Pudding. Each pack also contains instant coffee, tea bags, creamer, sugar, hot cocoa mix, beef/vegetable stock powder, lemon/orange powder or Lucozade electrolyte powder, matches, packet of tissues, chewing-gum, a small bottle of Tabasco sauce, and water purifying tablets. They sometimes also contain chicken and herb pâté. Also available are Kosher/Halal, Vegetarian, and Hindu/Sikh specific menus. Regardless of their contents, these ration packs are referred to as Rat-Packs or Compo (short for Composite Rations) by the soldiers who eat them.
Natural freshwater diatomaceous earth is preferred by many researchers over chromic oxide, which has been widely used for the same purpose, the latter being a known carcinogen and, therefore, a potential hazard to research personnel.
== Media == Ariely has appeared in several documentary films and television productions. In 2011, he worked on the documentary The Flaw, which investigates the causes of the 2008 financial crisis. In it, Ariely explained and presented scientific data on the forces that shape human behavior, motivation, and decision-making. In 2015, Ariely appeared in another documentary, (Dis)Honesty: The Truth About Lies. It explores three key themes: why people lie, how often they do it, and the consequences of dishonest behavior. Ariely contributed to Boom Bust Boom, a 2015 documentary about economic crashes. In 2019, he appeared in The Inventor: Out for Blood in Silicon Valley, a documentary that tracks the rise and fall of Theranos. In 2022, he contributed to Why Like This? Lama Kacha, a Hebrew television series broadcast on Kan 11. In it, Ariely distilled complex scientific concepts and provided accessible explanations for the forces that shape human behavior, motivation, and decision-making. Ariely has also presented talks at several TED, with titles such as "Our Buggy Moral Code" and "Unraveling the Mysteries of Human Behavior".
Sources: en.wikipedia.org
August Krogh and his wife Marie became interested in insulin upon hearing about it while on an American lecture tour in 1923; they modified their itinerary to meet with insulin discoverers Frederick Banting, John Macleod, Charles Best, and James Collip. August Krogh received permission to produce insulin in Denmark; Krogh and Hans Christian Hagedorn, with funding and facilities support from August Kongsted, began experimenting with means of extracting and purifying insulin from fish and rabbit pancreases. Known as the Insulin Laboratory, the research and production arm was operated as a unit of Kongsted's pharmaceutical company, Løvens Kemiske Fabrik. Kongsted rented a factory in Emdrup, Denmark, in late 1923 to help meet the demand for insulin. The Insulin Laboratory and the factory were spun off into a new company, Nordisk Insulin Laboratorium, in July 1924. The company was founded with an associated foundation and the three men served as the board of directors for both, with the foundation board membership barring them from profiting on the sale of insulin. The foundation and Nordisk Insulin signed articles of association in 1926 and the foundation received tax-exempt status by royal decree in January 1927. In 1925, brothers Harald and Thorvald Pedersen, who were former employees of Nordisk, formed their own company, Novo Terapeutisk Laboratorium. Novo and Nordisk competed until they merged in 1989 to become Novo Nordisk.
Hormonal IUDs (referred to as intrauterine systems in the UK) work by releasing a small amount of levonorgestrel, a progestin. The progestin released by hormonal IUDs primarily acts locally within the uterus, resulting in much lower systemic progestin levels than other progestogen only contraceptives. Each type of hormonal IUD varies in size, amount of levonorgestrel released, and duration of effectiveness. The predominant mechanism of action of progestin in the uterus is thickening the cervical mucus to prevent sperm from reaching the fallopian tubes and ultimately the egg. Hormonal IUDs can also thin the endometrial (uterine) lining and potentially impair implantation, but this is not their usual function. Because they thin the endometrial lining, hormonal IUDs often reduce or entirely stop menstrual bleeding. As a result, they are often used to treat menorrhagia (heavy menses), once pathologic causes of menorrhagia (such as uterine polyps) have been ruled out.
=== Agriculture's role in the economy === The significance and structure of a country's agricultural sector will affect digital agriculture adoption. For example, a grain-based economy needs difference technologies than a major vegetable producer. Automated, digitally-enabled harvesting systems might make sense for grains, pulses and cotton, but only a few specialty crops generate enough value to justify large investments in mechanized or automated harvesting. Farm size also affects technology choices, as economies of scale make large investments possible (e.g., adoption of precision agriculture is more likely on larger farms). On the other hand, digital agriculture solutions focused on ICTs and e-commerce would benefit an economy dominated by smallholders. In China, where the average farm size is less than 1 ha, Alibaba's customer-to-customer e-commerce platform called Rural Taobao has helped melon growers in Bachu County market their produce all over the country. Other structural factors, such as percent of the population employed in agriculture, farm density, farm mechanization rates, and other factors also impact how different regions adopt digital agriculture.
== SP == Sp (p) Special Spring tide (nautical charts) (i) sine prole (Latin, "without offspring") SP (i) Security Police Self-Propelled Shore Patrol (s) Spain (FIPS 10-4 country code) (i) Start Point Strong Point spa – (s) Spanish language (ISO 639-2 code) SPA - Single Page Application SPAAG – (a) Self-Propelled Anti-Aircraft Gun SPAC - Saratoga Performing Arts Center SPACECOM – (p) (U.S.) Space Command SPAL – (a) Società Polisportiva Ars et Labor ("Art & Labor Sports Club", with the "SP" from Italian and "AL" from Latin), Italian football club Spaser – (a) Surface plasmon amplification by stimulated emission of radiation SPC – (i) Secretariat of the Pacific Community SPCA - Society for the Prevention of Cruelty to Animals SPCO – (i) Single-Pole Change Over SPD (i) Shimano Pedaling Dynamics Sozialdemokratische Partei Deutschlands (Social Democratic Party of Germany) SPDT – (i) Single-Pole Double-Throw SPEAC – (a) Stop Primate Experiments at Cambridge (later became SPEAK) SPECTRE – SPecial Executive for Counter-intelligence, Terrorism, Revenge and Extortion S.P.E.A.R.
Further extending the shelf-life of stored blood up to 42 days was an anticoagulant preservative, CPDA-1, introduced in 1979, which increased the blood supply and facilitated resource-sharing among blood banks. As of 2006 about 15 million units of blood products were transfused per year in the United States. By 2013 the number had declined to about 11 million units, because of the shift towards laparoscopic surgery and other surgical advances and studies that have shown that many transfusions were unnecessary. For example, the standard of care reduced the amount of blood transfused in one case from 750 to 200 mL. In 2019, 10,852,000 RBC units, 2,243,000 platelet units, and 2,285,000 plasma units were transfused in the United States.
Sources: en.wikipedia.org
== Signs and symptoms == The symptoms of CMT often appear in childhood and adolescence, but in some cases, they may not develop until adulthood. The severity and progression of symptoms can vary widely between individuals even among members of the same family. Some people do not experience symptoms until their early 30s or 40s. The most common early sign of CMT is difficulty walking, often due to weakness in the muscles of the lower legs and feet. This muscle weakness can lead to foot drop, where patients have trouble lifting the front part of the foot, causing them to trip or adopt a high-stepping gait. Over time, individuals may develop distinctive foot deformities, such as high arches (known as pes cavus) and curled toes (hammertoes), due to muscle imbalance. As the disease progresses, the weakness often spreads to the hands and forearms, making tasks that require fine motor skills—like buttoning a shirt or writing—more difficult. In addition to motor symptoms, many people with CMT also experience a gradual loss of sensation in the feet, legs, hands, and arms. This sensory loss may affect the ability to feel pain, temperature, or touch, and can lead to problems with balance, especially in low-light conditions. Symptoms and progression of the disease can vary. Involuntary grinding of teeth and squinting are prevalent and often go unnoticed by the person affected. Breathing can be affected in some, as can hearing, vision, and neck and shoulder muscles. Scoliosis is common, causing hunching and loss of height. Hip sockets can be malformed.
== Career == After the break-up of the Beat in 1983 (known as the English Beat in North America), vocalists Dave Wakeling and Ranking Roger decided to continue working together in a new venture. They joined up with keyboardist Mickey Billingham (Dexys Midnight Runners), guitarist Mick Jones (the Clash), bassist Horace Panter (the Specials) and drummer Stoker (Dexys Midnight Runners/the Bureau) to form a supergroup of the UK punk and ska scene. They named the band General Public and were rapidly signed to Virgin Records in the UK and I.R.S. Records in North America. The band recorded and released the album All the Rage in 1984. Jones left General Public part way through the recording process, but he is listed in the album's inner sleeve credits as a group member (although he did not appear in any of the band photographs for the album cover). Jones' replacement, guitarist Kevin White, also played on the album and was also listed as an official group member. White's picture also appeared on the album's back cover. In the UK, General Public had a minor hit with the track "General Public", which reached No. 60 in the UK singles chart in 1984. The single's B-side "Dishwasher" (an instrumental mix of "Burning Bright" from All The Rage) became a surprise Top 40 hit in the Netherlands, after its use as a closing theme tune to the pop radio show Avondspits. Later in the year, the band fared even better in North America, where their second single "Tenderness" was a Top 30 hit in Canada (No. 11) and the US (No. 27).
=== Antivenom === Until the advent of antivenom, bites from some species of snake were almost universally fatal. Despite huge advances in emergency therapy, antivenom is often still the only effective treatment for envenomation. The first antivenom was developed in 1895 by French physician Albert Calmette for the treatment of Indian cobra bites. Antivenom is made by injecting a small amount of venom into an animal (usually a horse or sheep) to initiate an immune system response. The resulting antibodies are then harvested from the animal's blood. Antivenom is injected into the person intravenously, and works by binding to and neutralizing venom enzymes. It cannot undo the damage already caused by venom, so antivenom treatment should be sought as soon as possible. Modern antivenoms are usually polyvalent, making them effective against the venom of numerous snake species. Pharmaceutical companies that produce antivenom target their products against the species native to a particular area. The availability of antivenom is a major concern in some areas, including most of Africa, due to economic reasons (antivenom crisis). In Sub-Saharan Africa, the efficacy of antivenom is often poorly characterised and some of the few available products have even been found to lack effectiveness. Although some people may develop serious adverse reactions to antivenom, such as anaphylaxis, in emergency situations this is usually treatable in a hospital setting and hence the benefit outweighs the potential consequences of not using antivenom.
== Geography == According to the United States Census Bureau, the city has a total area of 149.60 square miles (387.5 km2), of which 148.54 sq mi (384.7 km2) is land and 1.07 sq mi (2.8 km2) (0.72%) is water. The Neuse River flows through the northeastern corner of the city. Raleigh is located in the northeast central region of North Carolina, where the Piedmont and Atlantic coastal plain regions meet. This area is known as the "fall line" because it marks the elevation inland at which waterfalls begin to appear in creeks and rivers. As a result, most of Raleigh features gently rolling hills that slope eastward toward the state's flat coastal plain. The city of Raleigh is located 24 mi (39 km) southeast of Durham; 63 mi (101 km) northeast of Fayetteville; 131 mi (211 km) northwest of Wilmington; 155 mi (249 km) southwest of Richmond, Virginia; and 165 mi (266 km) northeast of Charlotte. A small portion of Raleigh is located in Durham County, North Carolina.
Sources: en.wikipedia.org
It is a synthetic peptide. Its design was inspired by a fragment of a protein found in human gastric juice, but the fifteen-amino-acid molecule itself is made in a laboratory and is not a normal component of food or of human tissue in appreciable amounts.
The number is an internal laboratory designation from the research group that first described the fragment. It does not encode a molecular weight, a receptor target, or a measured biological effect, and it carries no meaning outside the naming history of the compound.
It contains fifteen amino acid residues and has a calculated mass of roughly 1419.5 daltons. That places it in the short-peptide range, well below the size of small proteins, which affects how it is synthesized, purified, and analyzed.
Low temperature slows the chemical reactions, such as oxidation and hydrolysis, that break down a peptide chain. Water and oxygen are the main drivers of degradation, so a cold and dry environment extends usable life. Actual shelf life depends on the batch, the salt form, and the container.