Visceral adipose tissue raises a handful of sensible questions. This page answers them in order, starting with the fundamentals and moving to applications.
This page was last updated on 2026-02-14 and is reviewed periodically as new material appears.
Common analytical approaches include reversed-phase high-performance liquid chromatography for purity assessment and mass spectrometry for identity confirmation. Peptide mapping after enzymatic digestion can verify the expected sequence. Immunoassays may be used to measure the compound or its downstream markers, but they can cross-react with related peptides and require careful validation. Impurity profiles typically include truncated sequences, oxidized methionine residues, and residual solvents from synthesis. Each method reports a different property, so no single assay establishes overall quality.
Storage claims vary across suppliers, and published stability data for specific formulations are limited. Extrapolating from related peptides is common but not a substitute for direct measurement. For research use, documentation such as a certificate of analysis is often requested to confirm identity and purity. What constitutes an acceptable purity threshold depends on the intended application. Open questions remain about how temperature excursions during shipping affect long-term peptide integrity. Independent verification by an end user is not routinely reported.
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.
| Property | Value | Notes |
|---|---|---|
| Physical form | Lyophilized powder | Requires reconstitution before use |
| Solubility | Soluble in water | Also dissolves in aqueous buffers |
| Storage, powder | 2 to 8 degrees Celsius | Protect from light and moisture |
| Storage, solution | Refrigerated, short term | Use promptly after reconstitution |
| Common assays | Reversed-phase HPLC and mass spectrometry | Purity and identity respectively |
质量控制项目一般包括外观、身份、纯度、含量、有关物质、水分和微生物限度。身份确认可通过肽图谱、氨基酸分析和质谱完成，纯度则用面积归一化法计算。研究级材料与药品级材料的要求不同，前者常缺少完整药典验证。不同批次间杂质谱是否影响活性，仍是一个需要具体数据回答的问题。
特沙莫瑞林的检测通常依赖反相高效液相色谱和质谱联用。反相色谱可分离肽主峰与缺失序列、氧化产物等杂质，质谱则提供精确质量以确认身份。对于复杂基质中的定量，常采用液相色谱-串联质谱，并配合固相萃取或蛋白沉淀。生物样品中的肽易降解，因此采集和处理条件会影响结果。
Metabolic interest in this compound centers on fat distribution rather than on hormone levels alone. Imaging trials in adults with excess abdominal fat report reductions in visceral adipose tissue, while subcutaneous depots change comparatively little. Growth hormone and IGF-1 are presumed to carry the effect, but the separate contribution of each is not firmly established. Whether these changes persist after treatment stops, and whether they alter longer-term health outcomes, remain open questions that published work does not answer consistently.
Tesamorelin is a synthetic peptide of forty-four amino acids whose sequence reproduces human growth hormone-releasing hormone. Its distinguishing feature sits at the amino terminus, where a trans-3-hexenoyl group replaces the free amine. That acylation slows cleavage by dipeptidyl peptidase IV, an enzyme that otherwise removes the first two residues and inactivates the natural hormone quickly. The modified peptide therefore persists longer in circulation while keeping the same receptor target. It is handled as a lyophilized solid and dissolved shortly before use.
Signaling begins at the GHRH receptor, a class B G protein-coupled receptor displayed on somatotroph cells of the anterior pituitary. Receptor occupancy activates Gs proteins, which raise adenylyl cyclase activity and intracellular cyclic AMP, in turn driving protein kinase A dependent pathways. The downstream output is synthesis and pulsatile secretion of growth hormone into the bloodstream. Hepatic tissue and peripheral sites respond by increasing insulin-like growth factor 1 production. Somatostatin and IGF-1 itself supply negative feedback that caps the size and duration of each secretory burst.
Pharmacodynamic studies show that tesamorelin reduces visceral adipose tissue more than subcutaneous adipose tissue in the studied population. This selectivity may relate to differences in blood flow and hormone sensitivity between fat depots. Effects on glucose metabolism and insulin sensitivity have been investigated, with some trials reporting modest changes and others showing stability. The precise relationship between growth hormone exposure, IGF-1 levels, and visceral fat loss remains an active area of analysis.
Tesamorelin binds to growth hormone-releasing hormone receptors on somatotroph cells in the anterior pituitary. Receptor activation increases intracellular cyclic AMP and promotes synthesis and secretion of growth hormone. Because the peptide mimics endogenous GHRH, it amplifies the normal pulsatile release of growth hormone rather than providing exogenous growth hormone directly. This upstream action distinguishes tesamorelin from recombinant growth hormone preparations and from growth hormone secretagogues that act at different receptors.
Stimulated growth hormone release leads to hepatic production of insulin-like growth factor 1, a key mediator of many growth hormone effects. In clinical studies, tesamorelin increased IGF-1 levels in a dose-dependent manner, although the response varies among individuals. The drug's effect on visceral fat is thought to involve growth hormone-mediated lipolysis and altered adipocyte metabolism. Muscle mass and lean body mass have also been assessed as secondary outcomes, but changes are generally smaller and less consistent than fat reductions.
year is the laboratory's determination of the age of the sample, in radiocarbon years range is the laboratory's estimate of the error in the age, at 1σ confidence. 'BP' stands for "before present", referring to a reference date of 1950, so that "500 BP" means the year AD 1450. For example, the uncalibrated date "UtC-2020: 3510 ± 60 BP" indicates that the sample was tested by the Utrecht van der Graaff Laboratorium ("UtC"), where it has a sample number of "2020", and that the uncalibrated age is 3510 years before present, ± 60 years. Related forms are sometimes used: for example, "2.3 ka BP" means 2,300 radiocarbon years before present (i.e. 350 BC), and "14C yr BP" might be used to distinguish the uncalibrated date from a date derived from another dating method such as thermoluminescence. Calibrated 14C dates are frequently reported as "cal BP", "cal BC", or "cal AD", again with 'BP' referring to the year 1950 as the zero date. Radiocarbon gives two options for reporting calibrated dates. A common format is "cal date-range confidence", where:
== Biosimilars == In December 2020, the Committee for Medicinal Products for Human Use (CHMP) of the European Medicines Agency adopted a positive opinion, recommending the granting of a marketing authorization for the medicinal product Kixelle, intended for the treatment of diabetes. The applicant for this medicinal product is Mylan IRE Healthcare Limited. Kixelle was approved for medical use in the European Union in February 2021. Kixelle was renamed to Kirsty. Trurapi was approved for medical use in Canada in October 2020. Truvelog and Truvelog Solostar were approved for medical use in Australia in October 2020. In October 2021, Kirsty was approved for medical use in Canada. In February 2022, the CHMP adopted a positive opinion, recommending the granting of a marketing authorization for the medicinal product Truvelog Mix 30, intended for the treatment of diabetes. The applicant for this medicinal product is sanofi-aventis groupe. It was approved for medical use in the European Union in April 2022. In January 2024, the European Commission withdrew the marketing authorization for Truvelog Mix 30 (insulin aspart) in the European Union. The withdrawal was at the request of the marketing authorization holder, Sanofi Winthrop Industrie, which notified the European Commission of its decision to permanently discontinue the marketing of the product for commercial reasons. In February 2025, insulin aspart-szjj, sold under the brand names Merilog and Merilog Solostar, is a biosimilar to Novolog that was approved for medical use in the United States in February 2025.
The commission noted that "the Russian intervention in Georgia was not limited to a “Blitz”-type action and was not solely focused on rescuing and evacuating Russian citizens." The commission said that "the constitutional obligation to protect Russian nationals [...] cannot serve as a justification for intervention under international law", adding that "Russian domestic law can [...] not be invoked as a justification for a breach of an international law." The commission suggested that "it seems abusive to rely on their need for protection as a reason for intervention, because Russia itself has created this reason for intervention". The commission concluded that "the Russian intervention in Georgia cannot be justified as a rescue operation for Russian nationals in Georgia."
In 2024, world production of potatoes was 390 million tonnes, led by China with 24% of the total, and India as a major secondary producer (table). The total area of potatoes harvested in the world in 2024 was 17.1 million hectares (42 million acres).
== Selected publications == Tiwari, V. Jin, Byungchang; Sun, Olivia; LopezGonzalez, Edwin D. J.; Chen, Min-Hsuan; Wu, Xiwei; Shah, Hardik; Zhang, Andrew; Herman, Mark A.; Spracklen, Cassandra N.; Goodman, Russell P.; Brenner, Charles (November 2025). "Glycerol-3-phosphate activates ChREBP, FGF21 transcription and lipogenesis in citrin deficiency". Nature Metabolism. 7 (11): 2284–2299. doi:10.1038/s42255-025-01399-3. ISSN 2522-5812. PMC 12638245 Brenner, C (2022-09-22). "Sirtuins are not conserved longevity genes". Life Metabolism (2): 122–133. doi:10.1093/lifemeta/loac025. ISSN 2755-0230. PMC 10081735. PMID 37035412. Brenner, C (January 2022). "Viral infection as an NAD+ battlefield". Nature Metabolism. 4 (1): 2–3. doi:10.1038/s42255-021-00507-3. ISSN 2522-5812. PMC 10155260. PMID 34980922. S2CID 245654307. Heer, CD; Sanderson, DJ; Voth, LS; Alhammad, YMO; Schmidt, MS; Trammell, SAJ; Perlman, S; Cohen, MS; Fehr, AR; Brenner, C (2020-10-13). "Coronavirus infection and PARP expression dysregulate the NAD Metabolome: an actionable component of innate immunity". Journal of Biological Chemistry. 295 (52): 17986–17996. doi:10.1074/jbc.RA120.015138. PMC 7834058. PMID 33051211. Vaur, P; Brugg, B; Mericskay, M; Li, Z; Schmidt, M S.; Vivien, D; Orset, C; Jacotot, E; Brenner, C (December 2017). "Nicotinamide riboside, a form of vitamin B3, protects against excitotoxicity-induced axonal degeneration". FASEB Journal. 31 (12): 5440–5452. doi:10.1096/fj.201700221RR. ISSN 1530-6860. PMID 28842432.
Sources: en.wikipedia.org
The mechanism of the Hofmeister series is not entirely clear, but seems to result mainly from effects on the solvent at higher salt concentrations (> 100 mM). Early members of the series increase solvent surface tension and decrease the solubility of nonpolar molecules (salt out); in effect, they strengthen the hydrophobic interaction. By contrast, later salts in the series increase the solubility of nonpolar molecules (salt in) and decrease the order in water; in effect, they weaken the hydrophobic effect. However, these salts also interact directly with proteins (which are charged and have strong dipole moments) and may even bind specifically (e.g., phosphate and sulfate binding to ribonuclease A). Ions that have a strong salting in effect such as I− and SCN− are strong denaturants, because they salt in the peptide group, and thus interact much more strongly with the unfolded form of a protein than with its native form. Consequently, they pull the unfolding reaction. Moreover, they may have direct interactions with some standard hydrophobic molecules, e.g., benzene. A quantum chemical investigation suggests an electrostatic origin of the Hofmeister series, which appears to quantify this qualitative series (at least for anions).
Secondly, elements 104 and 105 were given names favored by JINR, despite earlier recognition of LBL as an equal co-discoverer for both of them. Thirdly and most importantly, IUPAC rejected the name seaborgium for element 106, having just approved a rule that an element could not be named after a living person, even though the 1993 report had given the LBL team the sole credit for its discovery. In 1995, IUPAC abandoned the controversial rule and established a committee of national representatives aimed at finding a compromise. They suggested seaborgium for element 106 in exchange for the removal of all the other American proposals, except for the established name lawrencium for element 103. The equally entrenched name nobelium for element 102 was replaced by flerovium after Georgy Flerov, following the recognition by the 1993 report that that element had been first synthesized in Dubna. This was rejected by American scientists and the decision was retracted. The name flerovium was later used for element 114. In 1996, IUPAC held another meeting, reconsidered all names in hand, and accepted another set of recommendations; it was approved and published in 1997. Element 105 was named dubnium (Db), after Dubna in Russia, the location of the JINR; the American suggestions were used for elements 102, 103, 104, and 106. The name dubnium had been used for element 104 in the previous IUPAC recommendation. The American scientists "reluctantly" approved this decision.
According to US Joint Chiefs of Staff Chairman Gen Dan Caine, Trump gave the order to proceed at 23:46 VET (22:46 EST) on 2 January. The administration did not notify the United States Congress in advance of the strikes, saying they had concerns that this could endanger the mission. According to Semafor, The New York Times and The Washington Post knew about the strikes before they were carried out. At least seven explosions were reported at around 02:00 VET (01:00 EST) on 3 January, and low-flying aircraft were seen, predominantly in La Guaira, Higuerote, Meseta de Mamo, Baruta, El Hatillo, Charallave, and Carmen de Uria, most of which are in or near the capital city Caracas.
Specially, carbon nanotubes can be transformed into sophisticated biomolecule and allow its detection through changes in the carbon nanotube fluorescence spectra. Also, carbon nanotubes can be designed to match the size of small drug and endocitozed by a target cell, hence becoming a delivery agent.
=== Miscellaneous === Buprenorphine and dezocine are partial agonists of the MOR but antagonists of the KOR. Contrarily, eptazocine is an antagonist of the MOR but an agonist of the KOR; the same is also true for nalorphine and levallorphan. A variety of partial agonists or mixed agonists-antagonists of the MOR and KOR are also marketed, and include butorphanol, levorphanol, nalbuphine, pentazocine, and phenazocine. All of the aforementioned drugs may be described as opioid modulators instead of as pure antagonists. With the sole exception of nalorphine, all of the preceding are used as analgesics (by virtue of the fact that both MOR and KOR agonism independently confer pain relief). However, these opioid analgesics have atypical properties in comparison to the prototypical pure MOR full agonist opioid analgesics, such as less or no risk of respiratory depression for MOR partial agonists and antagonists, reduced or no euphoria, abuse potential, and dependence liability with MOR partial agonists/antagonists, and use- and dose-limiting side effects such as dysphoria and hallucinations with KOR agonists. In addition, by virtue of its KOR antagonism, buprenorphine (as buprenorphine/samidorphan (ALKS-5461) or buprenorphine/naltrexone to block its MOR agonism) is under investigation for the treatment of depression and cocaine dependence, as are other KOR antagonists such as aticaprant and, previously, JDTic and PF-4455242 (both discontinued due to toxicity concerns).
Sources: en.wikipedia.org
A c. 1894 Gustav Hammer & Co. commercial cooking machinery catalogue. Preserving foods ~ from the Clemson Extension Home and Garden Information Center National Center for Home Food Preservation BBC News Online – US army food... just add urine Home Economics Archive: Tradition, Research, History (HEARTH) An e-book collection of over 1,000 classic books on home economics spanning 1850 to 1950, created by Cornell University's Mann Library. Pobojewski, Sally (8 May 1995). "Underwater storage techniques preserved meat for early hunters". The University Record. University of Michigan. Archived from the original on 26 February 2019. Retrieved 28 September 2018.
=== Gold plating === For space missions, gold is used because it is useful at reflecting light, which helps to detect celestial objects from far away and gold does not oxidize so it will not tarnish, unlike most other metals. Due to both benefits, the James Webb Space Telescope uses gold on its mirrors. NASA partnered with Epner Technology, a Brooklyn-based business that has been gold-plating for generations to develop the technology to gold plate the telescope's parts. This NASA technology transfer to Epner gave the company a reputation for durable gold coatings. Academy of Motion Picture Arts and Sciences occasionally needs to replate Oscar statues that have faded over time. Epner has contracted with the academy to gold plate all future Oscars while offering a lifetime guarantee to replate, for free, any faded Oscar; its gold plating has lasted for decades in space without fading.
The uses of ayahuasca in traditional societies in South America vary greatly. Some cultures do use it for shamanic purposes, but in other cases, it is consumed socially among friends, in order to learn more about the natural environment. Nonetheless, people who work with ayahuasca in non-traditional contexts often align themselves with the philosophies and cosmologies associated with ayahuasca shamanism, as practiced among Indigenous peoples like the Urarina of the Peruvian Amazon. Dietary taboos are often associated with the use of ayahuasca, although these seem to be specific to the culture around Iquitos, Peru, a major center of ayahuasca tourism. Ayahuasca retreats or healing centers can also be found in the Sacred Valley of Peru, in areas such as Cusco and Urubamba, where similar dietary preparations can be observed. These retreats often employ members of the Shipibo-Konibo tribe, an indigenous community native to the Peruvian Amazon. In the rainforest, these taboos tend towards the purification of one's self—abstaining from spicy and heavily seasoned foods, excess fat, salt, caffeine, acidic foods (such as citrus) and sex before, after, or during a ceremony. A diet low in foods containing tyramine has been recommended, as the speculative interaction of tyramine and MAOIs could lead to a hypertensive crisis; however, evidence indicates that harmala alkaloids act only on MAO-A, in a reversible way similar to moclobemide (an antidepressant that does not require dietary restrictions).
== Literature == Hofmann K, Lucas RA, SAX SM (1952). "The chemical nature of the fatty acids of Lactobacillus arabinosus". J Biol Chem. 195 (2): 473–85. doi:10.1016/S0021-9258(18)55754-9. PMID 14946156.{{cite journal}}: CS1 maint: multiple names: authors list (link) Dennis W. Grogan, John. E. Cronan, Jr. (1997), "Cyclopropane ring formation in membrane lipids of bacteria", Microbiology and Molecular Biology Reviews, vol. 61, no. 4, pp. 429–441, Bibcode:1997MMBR...61..429G, doi:10.1128/mmbr.61.4.429-441.1997, PMC 232619, PMID 9409147{{citation}}: CS1 maint: multiple names: authors list (link)
=== Tropical dairy farm === In 1937, Cold Storage founded the world's first tropical dairy farm at the Bukit Timah district of Singapore, which aimed to produce fresh pasteurised milk. This farm, then known as the Singapore Dairy Farm, was situated inside what is now the Bukit Timah Nature Reserve. It kept as many as 800 cows. Pasteurised milk produced at the farm was packaged in pyramid-shaped cartons and sold under the brand Magnolia. By 1974, the farm was planned to be redeveloped into a residential area. Cold Storage is the Singapore's oldest established supermarket operator. It was the first supermarket in Singapore to receive the CaseTrust Mark introduced by the Consumer Association of Singapore (CASE) in 1998 which identifies companies that receive a high degree of consumer confidence. It was also the first supermarket in Singapore to receive MUIS certification for its supermarket operations at Causeway Point in Woodlands, thus providing Muslims with the assurance of Halal purchases.
Sources: en.wikipedia.org
Refrigeration between 2 and 8 degrees Celsius with protection from light is the common recommendation. Many laboratories choose frozen storage at minus 20 degrees Celsius when the material will not be used soon. Repeated temperature cycling is generally avoided.
Mass spectrometry gives the observed mass, which is compared against the value calculated from the sequence. Peptide mapping after digestion provides a second, sequence-level check. Chromatographic retention alone is not sufficient for identity.
Antibodies raised against one GHRH-related peptide may bind other members of the same family. That cross-reactivity inflates or distorts measured concentrations. Assay validation with defined standards is therefore necessary before results are interpreted.
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.