A practical reference on Visceral adipose tissue: what it is, how it behaves, what the literature reports, and where the honest uncertainties sit.
Reviewed 2026-02-16. Anything still debated is marked as such rather than presented as settled.
Clinical study of tesamorelin has centered on adults with HIV-associated lipodystrophy, a condition in which abdominal fat accumulates while peripheral fat is lost. In controlled trials, treated participants showed reductions in visceral adipose tissue measured by imaging, alongside modest shifts in some lipid values. Effects on subcutaneous fat were smaller and less consistent across studies. Whether these changes translate into fewer cardiovascular events remains an open question, because the trials were not designed or powered to answer it.
Tesamorelin is a synthetic peptide that acts as an analog of growth hormone-releasing hormone, a natural hypothalamic signal. Its sequence corresponds to the forty-four amino acid form of the human hormone, with a small acyl group attached near the amino terminus. That modification slows enzymatic breakdown and extends the time the peptide remains active in circulation. The compound was developed as a pharmacological way to raise endogenous growth hormone output rather than supplying the hormone directly.
Growth hormone released from the pituitary stimulates the liver and other tissues to produce insulin-like growth factor 1, a stable circulating protein that serves as a practical marker of activity. Clinical studies therefore track IGF-1 concentrations alongside the hormone itself, and they commonly measure body composition with imaging rather than relying on body weight alone. Visceral adipose tissue, the fat surrounding abdominal organs, is quantified by computed tomography in the studies that supported approval. Adverse effects reported in trials include injection-site reactions, joint pain, and increases in blood glucose, which is why monitoring accompanies use.
Questions remain about how much of the observed fat reduction reflects direct GHRH-receptor signaling versus the downstream growth hormone and IGF-1 surge. It is also unclear whether the compound produces meaningful benefit in populations without lipodystrophy, since trials in cognitive impairment did not reach their stated goals. Long-term effects on glucose metabolism and on cardiovascular outcomes are not fully characterized. Published work generally describes effects on surrogate markers rather than on hard clinical endpoints, and independent replication of some findings is limited.
Tesamorelin acts on the growth hormone-releasing hormone receptor, a G-protein-coupled receptor found on somatotroph cells in the anterior pituitary. Binding triggers a rise in intracellular cyclic AMP, which in turn opens ion channels and raises calcium concentrations, leading to release of stored growth hormone into the bloodstream. Because the peptide works through the same receptor as the body's own GHRH, the resulting secretion follows a pulsatile pattern rather than a continuous elevation. The N-terminal modification slows enzymatic breakdown, so the signal persists longer than it would with the unmodified hormone.
| Property | Value | Notes |
|---|---|---|
| Drug class | Peptide hormone analog | Acts at the growth hormone-releasing hormone receptor |
| Receptor | Growth hormone-releasing hormone receptor | G protein-coupled; raises cyclic AMP in somatotrophs |
| Key mediator | Insulin-like growth factor 1 | Increases with repeated administration |
| Main studied population | Adults with HIV-associated lipodystrophy | Trials measured visceral adipose tissue by imaging |
| Route | Subcutaneous injection | Given once daily in clinical use |
在临床研究之外，特沙莫瑞林常被讨论为生长激素分泌促进剂，但这一说法需要限定。它并不等同于生长激素本身，也不属于普通减重药物。部分研究关注其减少腹部脂肪和改善脂质谱的潜力，另一些研究则关注胰岛素抵抗和 IGF-1 升高等信号。这些效应的临床意义仍在评估中，尚未形成统一结论。
特沙莫瑞林是一种合成肽，其序列与人生长激素释放激素的 44 个氨基酸形式相关。它在 N 端带有反式-3-己烯酰基修饰，这一改动可减缓二肽基肽酶 IV 的降解。该化合物属于生长激素释放激素受体激动剂，可刺激垂体释放生长激素。研究文献通常将其归入合成肽类药物，而非小分子化合物。
Measuring the effect of a growth hormone-releasing hormone analogue requires markers that reflect pituitary output rather than the peptide itself. The two most frequently used are growth hormone and insulin-like growth factor 1. Growth hormone fluctuates sharply across the day and responds to sleep, stress, and meals, so isolated readings can be difficult to interpret. Insulin-like growth factor 1 changes more slowly and is often treated as the more stable integrated marker of axis activity.
Because growth hormone is released in pulses, single measurements can misrepresent overall secretion. Investigators sometimes use repeated sampling or overnight profiles to capture the pattern rather than a single value. Provocative testing, in which a stimulus is given and the response is tracked over time, offers another way to characterize the axis. Each approach carries trade-offs between sensitivity, burden on the participant, and the influence of non-target variables.
Receptor-level activity begins when the peptide binds the GHRH receptor, a class B G-protein-coupled receptor found on pituitary somatotroph cells. Occupancy triggers Gs-mediated activation of adenylyl cyclase and a rise in intracellular cyclic AMP, which in turn promotes synthesis and pulsatile release of growth hormone. Because the compound acts upstream of the growth hormone axis rather than supplying hormone directly, its effect depends on intact pituitary function. Binding studies in cell culture and animal models have established this pathway; the detailed kinetics of receptor recycling in humans remain less well characterized.
Physicochemical behavior is dominated by the peptide backbone. The molecule is hydrophilic and carries a net positive charge near neutral pH, owing to several arginine and lysine residues. In solution it adopts a largely unstructured conformation, and aggregation is a known concern for peptide products of this size. Oxidation of methionine and deamidation of asparagine or glutamine residues are the principal chemical degradation routes. These liabilities shape how the material is formulated, handled, and analyzed, and they explain why lyophilized presentations are common in research settings.
Tesamorelin is a synthetic peptide analog of growth hormone-releasing hormone, built from 44 amino acids. Its sequence follows the natural human GHRH(1-44) backbone, with a trans-3-hexenoyl group attached to the N-terminal tyrosine. This modification blocks recognition by dipeptidyl peptidase IV, the enzyme that rapidly truncates the native hormone in circulation. The result is a molecule with a substantially longer plasma residence time than unmodified GHRH, which makes it practical for clinical and laboratory study.
Under Khosrow II, the Sassanids occupied the Levant and Egypt and advanced into Asia Minor, and the Avars and Slavs raided in the Balkans. The Empire's control of Italy also weakened. After successfully repelling a siege of Constantinople in 626, Heraclius won a decisive victory at the Battle of Nineveh, eventually defeating the Sassanids later that year. The triumph would prove short-lived. The Arab conquests soon saw the conquest of the Levant, Egypt, and the Sassanid Empire by the newly formed Arab Rashidun Caliphate. By Heraclius' death in 641, the empire had been severely reduced economically and territorially—the loss of the wealthy eastern provinces had deprived the empire of as much as three-quarters of its revenue. The next century is poorly documented. Arab raids into Asia Minor started quickly, and the Empire responded by holding fortified centres and avoiding battle wherever possible. Although Anatolia was invaded annually, it avoided permanent Arab occupation. The outbreak of the First Fitna in 656 gave the Empire breathing space, which it used sensibly: some order was restored in the Balkans by Constans II (r. 641–668) following his administrative reorganisation which over time evolved into the "theme system", a structure that allocated troops to defend specific provinces. Constantine IV (r. 668–685) repelled the Arab efforts to capture Constantinople in the 670s using Greek fire, but suffered a reversal against the Bulgars, who soon established an empire in the northern Balkans.
No natural reservoir for SARS-CoV-2 has been identified. Prior to the emergence of SARS-CoV-2 as a pathogen infecting humans, there had been two previous zoonosis-based coronavirus epidemics, those caused by SARS-CoV-1 and MERS-CoV. The first known infections from SARS‑CoV‑2 were discovered in Wuhan, China. The nature of the virus's origins remain unclear and disputed. The original source of viral transmission to humans remains unclear, as does whether the virus became pathogenic before or after the spillover event. Because many of the early infectees were workers at the Huanan Seafood Market, it has been suggested that the virus might have originated from the market. Other research indicates that visitors may have introduced the virus to the market, which then facilitated rapid expansion of the infections. A March 2021 WHO-convened report stated that human spillover via an intermediate animal host was the most likely explanation, with direct spillover from bats next most likely. Introduction through the food supply chain and the Huanan Seafood Market was considered another possible, but less likely, explanation. Later analysis in November 2021 said that the earliest-known case had been misidentified and that the preponderance of early cases linked to the Huanan Market argued for it being the source. For a virus recently acquired through a cross-species transmission, rapid evolution is expected. The mutation rate estimated from early cases of SARS-CoV-2 was of 6.54×10−4 per site per year.
==== Mixed apnea ==== Some people with sleep apnea have a combination of both types; its prevalence ranges from 0.56% to 18%. The condition, also called treatment-emergent central apnea, is generally detected when obstructive sleep apnea is treated with CPAP and central sleep apnea emerges. The exact mechanism of the loss of central respiratory drive during sleep in OSA is unknown but is most likely related to incorrect settings of the CPAP treatment and other medical conditions the person has.
=== Historical taxonomy === The taxonomic history of Xanthoria parietina begins in 1753 with Carl Linnaeus, who first described it as Lichen parietinus in his landmark work Species Plantarum. In his brief diagnosis, Linnaeus characterized it as a foliose lichen with curled yellowish-brown lobes and a matching surface, citing Dillenius's earlier depiction and noting its broad European distribution on walls, rocks, and wood. Linnaeus's original specimens of Lichen parietinus are preserved in the Linnaean Herbarium (LINN), both labeled with his Species Plantarum number 25. These specimens have caused taxonomic confusion, as one actually corresponds to Rusavskia elegans (formerly Xanthoria elegans), while the other has features resembling Xanthoria ectaneoides. A separate specimen in his Flora Suecica collection was later reassigned to X. parietina. Due to these inconsistencies, taxonomists designated the illustration cited by Linnaeus from Dillenius (1742) as the lectotype, with a corresponding specimen in the Oxford herbarium (OXF) designated epitype.
Sources: en.wikipedia.org
32S + n → 32P + p Neutron irradiation is performed in a nuclear reactor. The other main method used to synthesize radioisotopes is proton bombardment. The proton are accelerated to high energy either in a cyclotron or a linear accelerator.
To determine the pore diameter, physical methods such as porosimeter (mercury, liquid-liquid porosimeter and Bubble Point Test) are also used, but a certain form of the pores (such as cylindrical or concatenated spherical holes) is assumed. Such methods are used for membranes whose pore geometry does not match the ideal, and we get "nominal" pore diameter, which characterizes the membrane, but does not necessarily reflect its actual filtration behavior and selectivity. The selectivity is highly dependent on the separation process, the composition of the membrane and its electrochemical properties in addition to the pore size. With high selectivity, isotopes can be enriched (uranium enrichment) in nuclear engineering or industrial gases like nitrogen can be recovered (gas separation). Ideally, even racemics can be enriched with a suitable membrane. When choosing membranes selectivity has priority over a high permeability, as low flows can easily be offset by increasing the filter surface with a modular structure. In gas phase filtration different deposition mechanisms are operative, so that particles having sizes below the pore size of the membrane can be retained as well.
Chronic dietary exposure to BMAA is now considered to be a cause of the amyotrophic lateral sclerosis/parkinsonism–dementia complex (ALS/PDC) that had an extremely high rate of incidence among the Chamorro people of Guam. The Chamorro call the condition lytico-bodig. In the 1950s, ALS/PDC prevalence ratios and death rates for Chamorro residents of Guam and Rota were 50–100 times that of developed countries, including the United States. No demonstrable heritable or viral factors were found for the disease, and a subsequent decline of ALS/PDC after 1963 on Guam led to the search for responsible environmental agents. The use of flour made from cycad seed (Cycas micronesica) in traditional food items decreased as that plant became rarer and the Chamorro population became more Americanized following World War II. Cycads harbor symbiotic cyanobacteria of the genus Nostoc in specialized roots which push up through the leaf litter into the light; these cyanobacteria produce BMAA. In addition to eating traditional food items from cycad flour directly, BMAA may be ingested by humans through biomagnification. Flying foxes, a Chamorro delicacy, forage on the fleshy seed covering of cycad seeds and concentrate the toxin in their bodies. Twenty-four specimens of flying foxes from museum collections were tested for BMAA, which was found in large concentrations in the flying foxes from Guam. As of 2021 studies continued examining BMAA biomagnification in marine and estuarine systems and its possible impact on human health outside of Guam.
=== Location === Metalloids lie on either side of the dividing line between metals and nonmetals. This can be found, in varying configurations, on some periodic tables. Elements to the lower left of the line generally display increasing metallic behaviour; elements to the upper right display increasing nonmetallic behaviour. When presented as a regular stairstep, elements with the highest critical temperature for their groups (Li, Be, Al, Ge, Sb, Po) lie just below the line.
Heppell, along with 33 other Essendon players, whilst not returning a positive test 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 teammates 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 AFL season. In February 2017, Heppell was announced as Essendon's new captain, taking over from Brendon Goddard. In December 2019, he signed a two-year contract extension with Essendon, keeping him at the club until 2022. He re-signed for 2023 but stepped down as captain after six seasons in the role. On 13 August 2024, Heppell announced that he would retire at the conclusion of the 2024 AFL season. Heppell played a farewell game in the Bombers' final game of the season, against the Brisbane Lions at The Gabba.
Sources: en.wikipedia.org
=== Drug delivery === Solid lipid nanoparticles can function as the basis for oral and parenteral drug delivery systems. SLNs combine the advantages of lipid emulsion and polymeric nanoparticle systems while overcoming the temporal and in vivo stability issues that troubles the conventional as well as polymeric nanoparticles drug delivery approaches. It has been proposed that SLNs have many advantages over other colloidal carriers i.e. incorporation of lipophilic and hydrophilic drugs feasible, no biotoxicity of the carrier, avoidance of organic solvents, possibility of controlled drug release and drug targeting, increased drug stability and no problems with respect to large scale production. Various functions such as molecules for targeting, PEG chains for stealth properties, or thiol groups for adhesion via disulfide bond formation can be immobilized on their surface. A recent study has demonstrated the use of solid lipid nanoparticles as a platform for oral delivery of the nutrient mineral iron, by incorporating the hydrophilic molecule ferrous sulfate (FeSO4) in a lipid matrix composed of stearic acid. Carvedilol-loaded solid lipid nanoparticles were prepared using hot-homogenization technique for oral delivery with compritol and poloxamer 188 as the lipid and surfactant, respectively. Another example of drug delivery using SLN would be oral solid SLN suspended in distilled water, which was synthesized to trap drugs within the SLN structure.
Studies have been done to create a spectrum of deuterium water and its isotopes to measure total body water, which can be used to determine the water body overload of a patient. That measurement will then be used to determine the stage of renal failure for a patient.
On June 11, 2009, Blabbermouth.net reported that the new album would be titled Black Gives Way to Blue and was officially set to be released on September 29, 2009. The title first appeared on Amazon.com without any prior announcement from the band. In addition, it was announced that Elton John plays piano on the title track, a tribute to Layne Staley written and sung by Cantrell. The album features new vocalist and rhythm guitarist William DuVall sharing vocal duties with lead guitarist/vocalist Jerry Cantrell, who sings lead vocals on most of the songs. DuVall sings lead vocals on the song "Last of My Kind".
In addition, they also used petroleum to cover their bodies against insect bites and as a form of jelly to prevent their skins from drying out. Peyote – indigenous people realized the antibiotic property of peyote and used the extract to treat fevers and enhance the energy in their bodies and treatment as an anesthetic. Pineapple – indigenous people residing in what is now Brazil and the Paraná River valley of Paraguay were the first to cultivate the pineapple. From there, pineapple cultivation spread to Mexico, Central and South America and the Caribbean. Indigenous Americans used the pineapple as a source of food. Planned city construction – ancient cities in Mexico–such as Teotihuacan and the Aztec capital of Tenochtitlan–incorporated planned city design, including streets laid out in a grid pattern. Plumbing – the Maya have been found to be the earliest inventors of plumbing in Mesoamerica, with the earliest example of a pressurized water system being constructed in 750 CE—or earlier. This pressurized water system was located in the Maya site of Palenque, where public baths and toilets were accessible to the residents of the ancient city. Poncho – worn by indigenous Americans in central Mexico, the Andes and Patagonia. Popcorn – Indigenous Americans were among the earliest peoples to develop popcorn, with evidence of popcorn dating back thousands of years in the Americas. Potato – The potato was domesticated 7,000–10,000 years ago in the highlands of southern Peru and northwestern Bolivia near Lake Titicaca.
== Business groups and products == Tosoh Corporation is divided into 13 business divisions organized into five groups: Petrochemical, Chlor-Alkali, Speciality, Engineering, and a fifth group composed of support services, including logistics, construction, engineering support, and other support activities. Listed below are the five groups and their primary products:
Sources: en.wikipedia.org
It is a laboratory-made peptide that mimics growth hormone-releasing hormone. It prompts the pituitary gland to release growth hormone and has been studied mainly in adults with HIV-associated lipodystrophy.
Administered growth hormone supplies the hormone directly, while this peptide acts upstream by prompting the pituitary to release it. The indirect route preserves pulsatile secretion and some endogenous feedback, which changes the hormone and IGF-1 profile observed after treatment.
Reductions in visceral adipose tissue appear consistently in randomized trials of the approved population. Effects on peripheral fat, cardiovascular outcomes, and use outside that population are less well established.
It acts upstream at the pituitary receptor and depends on functioning somatotroph cells to produce any effect. Growth hormone injections bypass that step and deliver the hormone directly. The pharmacokinetic profiles and the resulting feedback on the body's own secretion therefore differ.