Everything below concerns NMN. We keep the language plain, cite what the science says, and separate well-supported claims from open questions.
Last reviewed on 2025-08-04. Where a claim depends on a specific study, the study is described rather than over-claimed.
NMN occurs in many living systems, including bacteria, yeast, plants, and mammals. Dietary sources are present in foods such as edamame, avocado, broccoli, and various meats, but amounts vary widely and are generally lower than those used in research settings. Laboratory production often relies on enzymatic synthesis or chemical phosphorylation of nicotinamide riboside, and commercial material is typically supplied as a white to off-white powder. Because NMN is hygroscopic and sensitive to heat, moisture, and pH extremes, its handling requires care to preserve identity and purity. Aqueous preparation should be done with attention to pH and temperature to limit hydrolysis.
Nicotinamide mononucleotide, abbreviated NMN, is a naturally occurring nucleotide found in cells. Its structure consists of a nicotinamide ring linked to ribose phosphate, and the compound serves as an intermediate in the salvage pathway for nicotinamide adenine dinucleotide, or NAD+. In this pathway, nicotinamide phosphoribosyltransferase converts nicotinamide and phosphoribosyl pyrophosphate into NMN, after which NMN adenylyltransferase attaches an adenylate group to produce NAD+. Because NAD+ participates in redox reactions and signaling, NMN occupies a central position in cellular metabolism. The molecule is distinct from nicotinamide riboside, though the two are related in NAD+ precursor research.
Beyond its intracellular synthesis, NMN can be taken up from the extracellular environment, although the routes are still debated. Some evidence points to direct transport into cells through specific transporters, while other work suggests dephosphorylation to nicotinamide riboside followed by cellular uptake. Once inside, NMN can be converted to NAD+ by NMN adenylyltransferases; the relative contribution of these routes may differ by tissue, species, and experimental conditions. Researchers continue to investigate which mechanisms dominate in intact organisms and how they affect measured NAD+ levels. Direct measurement in tissues remains technically challenging because NMN can be rapidly metabolized during sample collection.
In the salvage pathway, NMN is generated from nicotinamide and 5-phosphoribosyl-1-pyrophosphate by the enzyme nicotinamide phosphoribosyltransferase. A second route produces NMN from nicotinamide riboside through phosphorylation by nicotinamide riboside kinases. NMN is then converted to NAD+ by nicotinamide mononucleotide adenylyltransferases, often called NMNAT enzymes. This stepwise route allows cells to recycle nicotinamide and maintain NAD+ levels under changing metabolic conditions. The relative contribution of each route varies by tissue, species, and physiological state, and it remains an active area of research.
Research on NMN has expanded because NAD+ concentrations decline with age in some tissues and because NAD+ participates in energy metabolism, DNA repair, and signaling. Animal studies have reported changes in NAD+ levels after NMN administration, but human data are more limited and often focus on safety, pharmacokinetics, and biomarker changes. Questions remain about oral absorption, tissue distribution, and whether changes in blood NAD+ reflect changes inside specific organs. NMN is not an approved drug, and claims about its clinical effects should be distinguished from established biochemical findings.
| Property | Value | Notes |
|---|---|---|
| Chemical formula | C11H15N2O8P | Neutral form; often supplied as a salt or hydrate. |
| Molecular weight | 334.22 g/mol | Calculated for C11H15N2O8P. |
| Appearance | White to off-white powder | Color can vary with purity and hydration. |
| Solubility | Soluble in water | Aqueous solutions are acidic and stability depends on pH and temperature. |
| Typical storage | −20 °C or below, desiccated | Protect from light; avoid repeated freeze-thaw cycles. |
Research on NMN has focused on aging, metabolic regulation, exercise capacity, and insulin sensitivity, but findings are preliminary. Many human trials are small, short in duration, and use different endpoints, which complicates comparison across studies. No national regulator has approved NMN as a therapeutic drug for any indication. In some countries it is sold as a supplement or research chemical, while other jurisdictions have questioned its status under food or supplement laws. Claims about extending human lifespan or reversing aging are not supported by established clinical evidence.
Nicotinamide mononucleotide, abbreviated NMN, is a naturally occurring nucleotide found in the cells of many organisms, including bacteria, plants, and mammals. Its structure consists of a nicotinamide ring attached to a ribose-phosphate group. NMN functions as an intermediate in the NAD+ salvage pathway, a recycling route that regenerates nicotinamide adenine dinucleotide. The enzyme nicotinamide phosphoribosyltransferase produces NMN from nicotinamide and phosphoribosyl pyrophosphate. A second enzyme, NMN adenylyltransferase, then converts NMN into NAD+.
Research interest in NMN increased after animal studies reported that oral or injected NMN can raise NAD+ levels in some tissues. How NMN is absorbed and distributed in humans is not fully established. Some evidence suggests extracellular NMN may be dephosphorylated to nicotinamide riboside before cellular uptake, while other studies propose specific transport routes. Direct human data on these mechanisms remain limited. Regulatory status also varies: in some countries NMN is treated as a dietary supplement, while elsewhere it is restricted or requires approval, and these differences affect labeling, sale, and research.
Nicotinamide mononucleotide, commonly abbreviated NMN, is a naturally occurring nucleotide found in the cells of many organisms. Its structure consists of a nicotinamide group linked to a ribose sugar that carries a phosphate group. NMN is an intermediate in the biosynthesis of nicotinamide adenine dinucleotide, or NAD+, a coenzyme involved in many metabolic reactions. The abbreviation usually refers to the beta anomer, though related forms can exist. In scientific literature, NMN is distinct from nicotinamide riboside, another NAD+ precursor.
The Office of Criminal Investigations was established in 1991 to investigate criminal cases. To do so, OCI employs approximately 200 special agents nationwide who, unlike ORA Investigators, are armed, have badges, and do not focus on technical aspects of the regulated industries. Rather, OCI agents pursue and develop cases when individuals and companies commit criminal actions, such as fraudulent claims or knowingly and willfully shipping known adulterated goods in interstate commerce. In many cases, OCI pursues cases involving violations of Title 18 of the United States Code (e.g., conspiracy, false statements, wire fraud, mail fraud), in addition to prohibited acts as defined in Chapter III of the FD&C Act. OCI special agents often come from other criminal investigations backgrounds, and frequently work closely with the Federal Bureau of Investigation, assistant attorney general, and even Interpol. OCI receives cases from a variety of sources—including ORA, local agencies, and the FBI, and works with ORA Investigators to help develop the technical and science-based aspects of a case.
Xing Qiyi (Chinese: 邢其毅; pinyin: Xíng Qíyì; Wade–Giles: Hsing Ch'i-i) was a Chinese organic chemist who contributed to the total synthesis of bovine insulin, Xing is still well-known nowadays in China as the main editor of a highly-influential organic chemistry textbook. He was a member of China Democratic League since 1952.
==== Vision ==== Microbats tend to have small eyes but are still sensitive to light, and no species is truly blind. Most microbats have mesopic vision, meaning that they can detect light only in low levels, whereas other mammals have photopic vision, which allows colour vision. Microbats may use their vision for orientation and while travelling between their roosting grounds and feeding grounds, as echolocation is effective only over short distances. Megabat species generally have good eyesight and may have some colour vision to help them distinguish ripe fruits. Some species can detect ultraviolet (UV). As the bodies of some microbats have distinct colouration, they may be able to discriminate colours.
They may have less vaginal atrophy and fewer problems concerning sexual intercourse. Vaginal changes that happen with aging and childbirth include mucosal redundancy, rounding of the posterior aspect of the vagina with shortening of the distance from the distal end of the anal canal to the vaginal opening, diastasis or disruption of the pubococcygeus muscles caused by poor repair of an episiotomy, and blebs that may protrude beyond the area of the vaginal opening. Other vaginal changes related to aging and childbirth are stress urinary incontinence, rectocele, and cystocele. Physical changes resulting from pregnancy, childbirth, and menopause often contribute to stress urinary incontinence. If a woman has weak pelvic floor muscle support and tissue damage from childbirth or pelvic surgery, a lack of estrogen can further weaken the pelvic muscles and contribute to stress urinary incontinence. Pelvic organ prolapse, such as a rectocele or cystocele, is characterized by the descent of pelvic organs from their normal positions to impinge upon the vagina. A reduction in estrogen does not cause rectocele, cystocele or uterine prolapse, but childbirth and weakness in pelvic support structures can. Prolapse may also occur when the pelvic floor becomes injured during a hysterectomy, gynecological cancer treatment, or heavy lifting. Pelvic floor exercises such as Kegel exercises can be used to strengthen the pelvic floor muscles, preventing or arresting the progression of prolapse.
Sources: en.wikipedia.org
=== Veterinary care === In the United States, more than 15,000 domesticated animals are bitten by snakes each year. Rattlesnake envenomations account for 80% of the deadly incidents. Dogs are most commonly bitten on the front legs and head. Horses generally receive bites on the muzzle, and cattle on their tongues and muzzles. If a domesticated animal is bitten, the hair around the bite should be removed so the wound can be clearly seen. The crotaline Fab antivenom has been shown to be effective in the treatment of canine rattlesnake bites. Symptoms include swelling, slight bleeding, sensitivity, shaking, and anxiety.
==== Road to war ==== Liu Wenhui's 1990 biography asserts that conflict between the two Lius was almost inevitable. Due to the consolidation of power in Sichuan that had occurred over the 1920s, Liu Wenhui and Liu Xiang had become the two most powerful warlords in the province. Liu Wenhui's assumption of the governorship in 1929 had turned many smaller warlords against him. By controlling the lower reaches of the Yangtze and the Qutang Gorge, Liu Xiang held the geographic advantage over his uncle, having priority in purchasing weapons from abroad (which entered Sichuan through the Yangtze), and had built a navy of three gunboats by fitting merchant ships with iron hulls. This also meant that Liu Xiang could block weapons from reaching Liu Wenhui's upstream domains, an ability that he would use to his advantage. Liu Xiang was also reportedly under the sway of his Taoist mystic advisor, Liu Congyun, who had told him that he was destined to unite the province under his rule. Yet another supposed factor contributing to conflict was the interference of Chiang Kai-shek, who did not want either warlord to become too powerful. Most sources agree that Liu Wenhui's abortive attempt to acquire military aviation assets in 1931 was the spark that led him to conflict with his nephew. Official Chinese sources state that a shipment ordered by Liu of foreign aircraft components worth 2 million yuan was seized by Liu Xiang at the port of Wanxian in Chongqing, leading to heightened tensions between the two Lius.
=== Structure === The structure of a nanogel is dependent upon the synthesis mechanism and its application. Simple or traditional nanogels are nanoparticle-sized crosslinked polymer networks that swell in water. Hollow nanogels consisting only of an outer shell can increase the amount of cargo loaded into the platform. In other nanogel structures, the inner core and outer shell can be made of two different materials, such as a hydrophobic inner core to surround drugs or other small molecules and a hydrophilic outer shell that interacts with the external environment. The addition of a second linear monomer crosslinked to a nanogel is deemed a "hairy nanogel". Different nanogel synthesis methods can be completed in sequential order to create multilayered nanogels, such as starting with ionotropic gelation and then combining anionic and cationic polymers in an aqueous solution. Functionalized nanogels, in which targeting ligands or stimuli-sensitive functional groups are conjugated to the outer shell of a nanogel, are also important for certain nanogel applications.
=== Breeding === Like many other gouramis, the male croaking gourami is a bubblenest builder, creating a small nest from air bubbles and mucus under a leaf. The water level should be reduced to 20 cm (7.9 in) during spawning, circulation kept minimal, and the temperature should be approximately 28 °C (82 °F). Spawning occurs under the nest, with the female responding to the male's dance by rolling over, followed by the typical gourami embrace. About 5 to 10 eggs are released in a quick burst. The male will grab the eggs and spit them into the nest, often adding a few more bubbles for good measure. This act may be repeated a dozen times or more until about 100 eggs are laid (some large females may lay more than 200). After spawning, the female should be moved to a different tank (to prevent her from eating the eggs). The male will keep the bubblenest maintained and tend to the eggs and fry, but when the fry are 2 to 3 days old, the male should also be removed (for the same reason). When first hatched, the fry should be fed infusoria, and later, baby brine shrimp and fine ground flakes. Freeze-dried tablets may also be fed to older fry.
5 December Junior doctors in England will stage further strike action after rejecting the latest pay offer, the British Medical Association confirms, with a three-day strike scheduled to begin on 20 December and a six-day strike scheduled to begin on 3 January 2024. The Scottish Prison Service issues new guidelines on transgender prisoners. Trans women who have hurt or threatened women or girls will not be sent to a female prison unless there are "exceptional" circumstances. Jesse Darling is announced as the winner of the 2023 Turner Prize. 6 December Boris Johnson, who served as prime minister from 2019 to 2022, appears before the COVID-19 inquiry and is questioned by Hugo Keith, counsel to the inquiry. He apologises for the "pain and the loss and the suffering" people experienced during the pandemic. His comments are interrupted by protesters, who are ordered to leave the inquiry room. Robert Jenrick resigns as immigration minister after the government publishes an emergency Rwanda bill. 7 December Figures released by Halifax Bank indicate house prices in the UK rose by 0.5% in November 2023. Culture Secretary Lucy Frazer confirms the TV licence fee will increase by £10.50 from £159 to £169.50 from 1 April 2024. Serial killer Steve Wright is arrested for the September 1999 murder of Victoria Hall. 8 December A letter to MPs from Sir Matthew Rycroft, the Permanent Under-Secretary of State of the Home Office, says that £240m has been paid so far to Rwanda for the Rwanda asylum plan, with a further £50m to be paid in 2024.
Sources: en.wikipedia.org
This is a promising and newer microarray application for the diagnosis, study and treatment of complex diseases such as cancer. The technology merges laser capture microdissection (LCM) with micro array technology, to produce reverse-phase protein microarrays. In this type of microarrays, the whole collection of protein themselves are immobilized with the intent of capturing various stages of disease within an individual patient. When used with LCM, reverse phase arrays can monitor the fluctuating state of proteome among different cell population within a small area of human tissue. This is useful for profiling the status of cellular signaling molecules, among a cross-section of tissue that includes both normal and cancerous cells. This approach is useful in monitoring the status of key factors in normal prostate epithelium and invasive prostate cancer tissues. LCM then dissects these tissue and protein lysates were arrayed onto nitrocellulose slides, which were probed with specific antibodies. This method can track all kinds of molecular events and can compare diseased and healthy tissues within the same patient enabling the development of treatment strategies and diagnosis. The ability to acquire proteomics snapshots of neighboring cell populations, using reverse-phase microarrays in conjunction with LCM has a number of applications beyond the study of tumors. The approach can provide insights into normal physiology and pathology of all the tissues and is invaluable for characterizing developmental processes and anomalies.
=== Assembly === Ribosomal RNA's integration and assembly into ribosomes begins with their folding, modification, processing and assembly with ribosomal proteins to form the two ribosomal subunits, the LSU and the SSU. In Prokaryotes, rRNA incorporation occurs in the cytoplasm due to the lack of membrane-bound organelles. In Eukaryotes, however, this process primarily takes place in the nucleolus and is initiated by the synthesis of pre-RNA. This requires the presence of all three RNA polymerases. In fact, the transcription of pre-RNA by RNA polymerase I accounts for about 60% of cell's total cellular RNA transcription. This is followed by the folding of the pre-RNA so that it can be assembled with ribosomal proteins. This folding is catalyzed by endo- and exonucleases, RNA helicases, GTPases and ATPases. The rRNA subsequently undergoes endo- and exonucleolytic processing to remove external and internal transcribed spacers. The pre-RNA then undergoes modifications such as methylation or pseudouridinylation before ribosome assembly factors and ribosomal proteins assemble with the pre-RNA to form pre-ribosomal particles. Upon going under more maturation steps and subsequent exit from the nucleolus into the cytoplasm, these particles combine to form the ribosomes. The basic and aromatic residues found within the primary structure of rRNA allow for favorable stacking interactions and attraction to ribosomal proteins, creating a cross-linking effect between the backbone of rRNA and other components of the ribosomal unit.
== Drawbacks == There have been a few technical issues that have limited adoption of SFC technology in the past. First of all, is the need to keep a high gas pressure in the operating conditions. High-pressure vessels are expensive and bulky, and special materials are often needed to avoid dissolving gaskets and O-rings in the supercritical fluid. A second drawback is difficulty in maintaining pressure constant (by back-pressure regulation). Whereas liquids are nearly incompressible, so their densities are constant regardless of pressure, supercritical fluids are highly compressible and their physical properties change with pressure – such as the pressure drop across a packed-bed column. Currently, automated backpressure regulators can maintain a constant pressure in the column even if flow rate varies, mitigating this problem. A third drawback is difficulty in gas/liquid separation during collection of product. Upon depressurization, the CO2 rapidly turns into gas and aerosolizes any dissolved analyte in the process. Cyclone separators have lessened difficulties in gas/liquid separations.
=== Red Star === 777 Partners bought Red Star FC of the French third-tier Championnat National in April 2022. The club was founded in 1897 by Jules Rimet, who was later president of FIFA. The takeover was met with backlash due to the club's working-class and left-wing history, and concerns that the club would become a farm team for 777's other assets. Former presidential candidate Jean-Luc Mélenchon was one of several politicians to sign a letter published in Le Monde, stating "For us, Red Star is a common good that cannot be sacrificed on the altar of profit." Éric Coquerel, the parliamentary deputy whose constituency includes Red Star's home of Saint-Ouen-sur-Seine, has campaigned for laws against multi-club ownership. Red Star won promotion to Ligue 2 in 2024.
While the recreational use of (and consequently the distribution of) cannabis is illegal in majority of countries, recreational distribution is legal in some countries, such as Canada, and medical distribution is permitted in some places, such as 38 of the 50 US states (although importation and distribution is still federally prohibited). Beginning in 2014, Uruguay became the first country to legalize cultivation, sale, and consumption of cannabis for recreational use for adult residents. In 2018, Canada became the second country to legalize use, sale and cultivation of cannabis. The first few weeks were met with extremely high demand, most shops being out of stock after operating for only four days. Cannabis use is tolerated in some areas, most notably the Netherlands, which has legalized the possession and licensed sale (but not cultivation) of the drug. Many nations have decriminalized the possession of small amounts of marijuana. Due to the hardy nature of the cannabis plant, marijuana is grown all across the world; today, it is the world's most popular illegal drug with the highest level of availability. Cannabis is grown legally in many countries for industrial, non-drug use (known as hemp) as well. Cannabis-hemp may also be planted for other non-drug domestic purposes, such as seasoning that occurs in Aceh. The demand for cannabis around the world, coupled with the drug's relative ease of cultivation, makes the illicit cannabis trade one of the primary ways in which organized criminal groups finance many of their activities.
Sources: en.wikipedia.org
NMN is nicotinamide mononucleotide, a nucleotide intermediate in NAD+ biosynthesis. It consists of nicotinamide, ribose, and phosphate groups.
No. NMN is a precursor, while NAD+ is the dinucleotide product formed after an adenylate group is added. They are distinct molecules with different cellular roles.
Small amounts of NMN have been reported in several foods, including some vegetables and meats. The concentrations are variable and usually much lower than those used in laboratory research.
NMN stands for nicotinamide mononucleotide. It is a naturally occurring nucleotide and an intermediate in the cellular production of NAD+.