The short version of mass spectrometry fits in a sentence. The long version — which is the one that helps — is below.
Reviewed 2026-03-15. Anything still debated is marked as such rather than presented as settled.
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.
Early work on this family of molecules examined fractions of human gastric juice, where a larger protein was reported to protect gastrointestinal tissue in animal models. BPC 157 was designed as a shorter, more stable fragment of that protein and then studied on its own. The peptide itself is not a normal dietary component and is not present in the human body in meaningful quantities. Descriptions of its origin therefore refer to the research lineage of a laboratory molecule rather than to an endogenous or nutritional substance.
In its common research form the peptide is supplied as a lyophilized powder. It dissolves readily in water and in typical aqueous buffers, which simplifies preparation of working solutions. Laboratories usually prepare small aliquots instead of one large volume. The dry material appears as a white to off-white solid with no distinctive odor. Bulk quantities are typically shipped in sealed vials.
Lyophilized material is generally kept cold, commonly at minus twenty degrees Celsius, and shielded from moisture and light. Solutions are less stable than the dry powder, so repeated freeze-thaw cycles are avoided by splitting the material into single-use portions. Published stability data for this particular peptide are limited, which means suggested hold times should be read as provisional. Long-term refrigeration of reconstituted solutions is not well supported by available evidence.
| 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 |
The peptide was first described in the early 1990s by a group studying gastric secretions and tissue repair. Its fifteen-residue chain is usually written as GEPPPGKPADDAGLV in single-letter code. The free peptide has the formula C62H98N16O22 and a theoretical mass near 1419.5 daltons. These identifiers are established chemical facts that can be checked against standard peptide databases. There is no ambiguity about the primary structure.
Most published findings come from rodent experiments using induced injury or surgical models. Human reports remain scarce and are largely observational, which limits how much can be stated with confidence. Questions about absorption, distribution, metabolism, and clearance in people are still open. Dose translation between species is likewise unresolved. Researchers tend to read the animal literature as a starting point rather than a settled account.
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.
== Equipment == In using form-fill-seal packaging machines, the main function is to place the product in a flexible pouch suitable for the desired characteristics of the final product. These pouches can either be pre-formed or thermoformed. The food is introduced into the pouch, the composition of the headspace atmosphere is changed within the package; it is then heat sealed. These types of machines are typically called pillow-wrap, which horizontally or vertically form, fill and seal the product. Form-fill-seal packaging machines are usually used for large scale operations. In contrast, chamber machines are used for batch processes. A filled pre-formed wrap is filled with the product and introduced into a cavity. The cavity is closed and vacuum is then pulled on the chamber and the modified atmosphere is inserted as desired. Sealing of the package is done through heated sealing bars, and the product is then removed. This batch process is labor-intensive and thus requires a longer period of time; however, it is relatively cheaper than packaging machines which are automated. Additionally, snorkel machines are used to modify the atmosphere within a package after the food has been filled. The product is placed in the packaging material and positioned into the machine without the need of a chamber. A nozzle, which is the snorkel, is then inserted into the packaging material. It pulls a vacuum and then flushes the modified atmosphere into the package. The nozzle is removed and the package is heat sealed. This method is suitable for bulk and large operations.
=== Medicine === Use of DMSO in medicine dates from around 1963, when an Oregon Health & Science University Medical School team, headed by Stanley Jacob, discovered it could penetrate the skin and other membranes without damaging them and could carry other compounds into a biological system. In medicine, DMSO is predominantly used as a topical analgesic, a vehicle for topical application of pharmaceuticals, as an anti-inflammatory, and an antioxidant. Because DMSO increases the rate of absorption of some compounds through biological tissues, including skin, it is used in some transdermal drug delivery systems. Its effect may be enhanced with the addition of EDTA. It is frequently compounded with antifungal medications, enabling them to penetrate not just skin but also toenails and fingernails. DMSO has been examined for the treatment of numerous conditions and ailments, but the U.S. Food and Drug Administration (FDA) has approved its use only for the symptomatic relief of patients with interstitial cystitis. A 1978 study concluded that DMSO brought significant relief to the majority of the 213 patients with inflammatory genitourinary disorders that were studied.
== Etymology == The word hypoglycemia is also spelled hypoglycaemia or hypoglycæmia. The term means 'low blood sugar' from Greek ὑπογλυκαιμία, from ὑπο- hypo- 'under' + γλυκύς glykys 'sweet' + αἷμᾰ haima 'blood'.
Sources: en.wikipedia.org
== Gene == The human CUX1 gene is large, encompassing more than 440,000 base pairs with two alternative first exons and an additional 23 exons. The last exon has a weak polyadenylation site allowing RNA polymerase II often to continue transcribing until it reaches an additional 10 exons. Splicing of this longer transcript from exon 14 to exon 25 generates a mature mRNA that codes for a protein that was called CASP (Cut alternatively spliced product). CASP localizes to the Golgi and does not seem to impact at all on CUX1 function. However, because of the complex structure of the gene, most oligos in microarrays were derived from the most 3' exons that are unique to CASP. Thus, until the advent of RNA sequencing CUX1 expression data has been essentially limited to immunohistochemical analyses. Similarly, many guide RNAs in CRISPR-Cas screening studies target the CASP-specific exons and do not affect CUX1.
covalent bond Also molecular bond. A bond that involves the sharing of electron pairs between atoms. The stable balance of attractive and repulsive forces that occurs between atoms when they share electrons is known as covalent bonding.
23 January – The largest interstellar organosulfur molecule (2,5-cyclohexadiene-1-thione) so far is identified in a molecular cloud about 27,000 light-years from Earth near the Galactic Center. 24 January – AES Andes abandons the INNA project to produce hydrogen and ammonia in Chile criticised for its potentially negative impact on astronomical observations at Paranal Observatory and Extremely Large Telescope. 27 January – HD 137010 b, a cool Earth-sized transiting exoplanet candidate 146 light years away, orbiting near the outer edge of its star's habitable zone, is discovered in Kepler K2 data from 2017. 28 January – Researchers at Google DeepMind publish a study on AlphaGenome, a deep learning model that predicts the functional effects of genetic variants across multiple regulatory modalities from long DNA sequences, improving interpretation of non-coding regions of the genome.
== Method == Electron probe microanalysis (EMPA), Synchrotron micro-XRF (SR-M-XRF), Time-of-flight secondary ion mass spectrometry (TOF-SIMS), Laser induced breakdown spectroscopy (LIBS), Atomic emission spectrometry, x-ray fluorescence spectrometry with higher energy synchrotron radiation (SR-XFS) and Laser ablation-Inductively coupled plasma mass spectrometry (LA-ICP-MS) are all methods of gold fingerprinting. The most common method is LA-ICP-MS primarily because it is quasi-nondestructive, allowing for the preservation of the samples and convenient as samples require little to no preparation. Laser ablation allows for high spatial resolution sampling while the inductively coupled plasma mass spectrometry provides high sensitivity to identify extremely small amounts of trace elements within the gold. This method can also be conducted outside of a lab with the assistance of a portable device that uses a diode pumped solid state laser and fiber-optics, making fingerprinting more convenient as it eliminates the need for transfer of gold to a specific lab. Advantages of LA-ICP-MS include reduced sample preparation, no sample size requirements, reduced spectral interference and increased sample throughput. Over the past 32 years, LA-ICP-MS has been used for archaeological, biological and forensic purposes. For example a group of gold foil fragments dating back to the 5th Century B.C.E. were analysized by LA-ICP-MS uncovering information on their manufacturing process, function and relationship to one another.
Sources: en.wikipedia.org
==== Sexual misconduct and resignation ==== A $279,000 payoff for the silence of Jessica Hahn, who alleged that Bakker and former PTL Club co-host John Wesley Fletcher drugged and raped her, was paid with PTL funds through Bakker's associate Roe Messner. Bakker, who made PTL's financial decisions, allegedly kept two sets of books to conceal accounting irregularities. Reporters for The Charlotte Observer, led by Charles Shepard, investigated PTL's finances and published a series of articles. On March 19, 1987, after the disclosure of a payoff to Hahn, Bakker resigned from PTL. Although he acknowledged that he had a sexual encounter with Hahn at a hotel room in Clearwater, Florida, he denied raping her. Bakker was also the subject of homosexual and bisexual allegations made by Fletcher and PTL director Jay Babcock, which Bakker denied under oath. Rival televangelist John Ankerberg appeared on Larry King Live and made several allegations of moral impropriety against Bakker, which both Bakkers denied. Bakker was succeeded as PTL head by the Rev. Jerry Falwell of Thomas Road Baptist Church in Lynchburg, Virginia. Bakker chose Falwell as his successor because he feared that fellow televangelist Jimmy Swaggart, who had initiated an Assemblies of God investigation into Bakker's sexual misconduct, was attempting to take over his ministry. Bakker believed that Falwell would temporarily lead the ministry until the scandal died down, but on April 28, 1987, Falwell barred Bakker from returning to PTL.
=== Directed evolution === Directed evolution of an enzyme is a repetitive process of creating random genetic mutations, screening for a target phenotype, and selecting the most robust variant(s) for further modification. The ability of humankind to use directed evolution to optimize enzymes for biotechnological purposes is largely limited by the throughput of screening tools and methods and the simplicity of their use. Due to the iterative nature of directed evolution and the necessity for large libraries, directed evolution at the macroscale can be a costly endeavor. As such, performing experiments at the microscale through droplet-based microfluidics provides a significantly cheaper alternative to macroscopic equivalents. Various approaches price the directed evolution through droplet microfluidics under $40 for a screen of a 106–107 sized gene library, while the corresponding macroscale experiment is priced at approximately $15 million. Additionally, with screening times that range from 300 to 2000 droplets sorted per second, droplet-based microfluidics provides a platform for significantly accelerated library screening such that gene libraries of 107 can be sorted well within a day. Droplet-based microfluidic devices make directed evolution accessible and cost effective. Many different approaches to device construction of droplet-based microfluidic devices have been developed for directed evolution in order to have the capacity to screen a vast variety of different proteins, pathways, and genomes.
== Regulation == The regulation of the glyoxylate cycle involves carbon source availability, as it controls the transcriptional levels of key enzymes. Carbon catabolite repression is the main process that occurs in bacteria and fungi that regulates the transcriptional levels of the glyoxylate cycle, ensuring that the cycle is activated when glucose is not available. For instance, in Escherichia coli, the regulation of the isocitrate branch point takes place by regulating the transcription level of IclR and FadR, and through AceK, which is a bifunctional enzyme that acts as both a dehydrogenase kinase and a phosphatase. AceK is responsible for the regulation of isocitrate dehydrogenase and its switching roles in the citric acid cycle as well as the glyoxylate cycle. It determines whether the carbon atoms will be used in the glyoxylate cycle or the citric acid cycle. The phosphorylation, catalyzed by the AceK kinase function, of isocitrate dehydrogenase decreases its activity, and this phosphorylation can be reversed. In plants, the regulation of the glyoxylate cycle is achieved by regulating transcriptional levels during the seed germination process and through the mobilization of stored lipids . In bacteria, such as Mycobacterium tuberculosis, the glyoxylate cycle is up regulated especially when glucose is scarce and is needed during host infection. This regulation contributes to the growth and virulence of the pathogenic infection. Overall, these regulations allow for the conservation of carbon and activate the biosynthesis of key metabolites when carbon source is limited.
=== Relationship with other guerrillas === The Hukhbalahap's methods were generally terrorist in nature; for example, Ray Hunt, an American who led his own band of 3,000 guerrillas, said of the Hukbalahap that
== History == In the early 1900s it was discovered that a mixture containing calcium chloride, ammonium sulfate, and potassium bromate halved the amount of yeast needed to raise dough. These mixtures were generally known as mineral yeast foods or yeast nutrient salts. After they became popular among bakers, one patented yeast food was analyzed by Connecticut Agricultural Experiment Station chief chemist J. P. Street, who published in 1917 that it contained, "calcium sulphate, 25; ammonium chlorid, 9.7; potassium bromate, 0.3; sodium chlorid, 25; patent wheat flour, 40." They contain water conditioners, yeast conditioners, and dough conditioners.
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.
Dry powder is commonly held at minus twenty degrees Celsius, desiccated and away from light. Cold storage slows degradation of the lyophilized material.