The short version of reconstitution fits in a sentence. The long version — which is the one that helps — is below.
Reviewed 2025-08-29. Anything still debated is marked as such rather than presented as settled.
研究背景集中在特定人群的体成分改变，尤其是与脂肪分布异常相关的内脏脂肪堆积。不同地区对它的监管状态与获批适应症并不一致，部分市场仅限特定诊断人群使用。在一般人群中的长期效应、与其他激素的相互作用以及停药后的维持情况仍属开放问题，现有数据不足以给出普遍结论。
tesamorelin 是一种人工合成的四十四肽，序列与内源性生长激素释放激素（GHRH）的 1-44 片段一致，区别在于 N 端加接了一个反式-3-己烯酰基。该修饰抑制二肽基肽酶 IV 的快速切割，从而延长分子在循环中的存留时间。作为肽类分子，它难以经胃肠道吸收，文献中讨论的均是注射途径。分类上通常把它归为 GHRH 类似物，以区别于生长激素本身。
作用位置在垂体前叶。tesamorelin 与 GHRH 受体结合后激活腺苷酸环化酶，升高细胞内 cAMP，再经蛋白激酶 A 通路促进生长激素的合成与释放。由于它作用于内源调控节点，生长激素仍以脉冲方式分泌，而不是被持续抬升到固定水平。生长激素随后在肝脏等组织诱导胰岛素样生长因子 1 产生，构成完整的生长激素轴响应。
Regulatory position depends on jurisdiction and on the form in which the material is sold. A branded product holds approval in the United States for a defined indication, and prescribing is confined to that label. Material marketed for laboratory research is not evaluated for human use and carries no such clearance. Independent verification therefore rests on certificates of analysis, third-party testing, and documented chain of custody. The substance also appears on the World Anti-Doping Agency prohibited list within the category covering growth hormone-releasing factors.
Lyophilized material is typically held under refrigeration between two and eight degrees Celsius, shielded from light and ambient moisture. Peptides of this size adsorb to glass and plastic, so working procedures often call for low-binding containers and as few transfers as possible. Absorbed water during weighing shifts the apparent mass of a sample, and controlling room humidity reduces that source of error. Once dissolved, solutions are kept cold and used within the interval printed on the accompanying label or certificate. Degradation accelerates markedly in dilute aqueous form.
| 性质 | 取值 | 备注 |
|---|---|---|
| 分子类型 | 合成四十四肽 | GHRH 类似物 |
| N 端修饰 | 反式-3-己烯酰基 | 延缓酶切 |
| 分子量 | 约 5135 Da | 依序列与修饰 |
| 受体靶点 | 垂体 GHRH 受体 | 经 cAMP 通路 |
| 常见同义名 | GHRH(1-44) 类似物 | 文献通用称法 |
Regulatory approval in the United States came in 2010, when the Food and Drug Administration cleared the peptide for the reduction of excess abdominal fat in adults with HIV infection and associated lipodystrophy. The decision rested mainly on two randomized phase 3 trials that enrolled roughly eight hundred patients and ran for twenty-six weeks. Participants receiving active drug showed substantially greater declines in visceral adipose tissue than those receiving placebo, while total body weight changed comparatively little. A reformulated presentation was later approved, and the product has remained a niche therapy rather than a general weight-loss agent.
Tesamorelin occupies a narrow position among agents that act on the growth hormone axis. Unlike growth hormone itself, which is given as replacement, it stimulates the pituitary to release the hormone in pulses, so the downstream increase in insulin-like growth factor 1 depends on intact somatotroph function. Other peptides in the same family include shorter GHRH fragments and synthetic secretagogues with different stability profiles. Several points remain unresolved, including whether the reduction in visceral fat translates into fewer cardiovascular events, what happens to metabolic markers after long-term use, and how the drug compares with lifestyle or surgical approaches.
Tesamorelin is a synthetic peptide that belongs to the growth hormone-releasing hormone family and contains the same forty-four amino acid sequence as endogenous GHRH, extended at the amino terminus by a trans-3-hexenoyl group. That small fatty acid modification protects the peptide from rapid cleavage by dipeptidyl peptidase-4, the enzyme that shortens the half-life of native GHRH to only a few minutes. Chemically the compound is produced by solid-phase peptide synthesis, purified by chromatography, and supplied as a sterile lyophilized powder for reconstitution.
Lyophilized tesamorelin is generally stored refrigerated at 2 to 8 degrees Celsius, protected from light and moisture. Peptides in this class are often kept frozen at minus 20 degrees Celsius for longer periods. Reconstituted solutions are typically used within a defined window because hydrolysis and oxidation proceed faster in liquid form. Container material and headspace also influence how long a preparation retains its expected profile. Specific stability figures depend on concentration and buffer composition.
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.
=== Men's physique === Due to those who found open-bodybuilding to be "too big" or "ugly" and unhealthy, a new category was started in 2013. The first Men's Physique Olympia winner was Mark Wingson, who was followed by Jeremy Buendia for four consecutive years. Like open-bodybuilding, the federations in which bodybuilders can compete are natural divisions as well as normal ones. The main difference between the two is that men's physique competitors pose in board shorts rather than a traditional posing suit and open-bodybuilders are much larger and are more muscular than the men's physique competitors. Open-bodybuilders have an extensive routine for posing while the Physique category is primarily judged by the front and back poses. Many of the men's physique competitors are not above 200 lbs and have a bit of a more attainable and aesthetic physique in comparison to open-bodybuilders. Although this category started off slowly, it has grown tremendously, and currently men's physique seems to be a more popular class than open-bodybuilding.
20,000, 11 December 2007- On 29 October 2007, the SENSEX crossed the 20,000 mark for the first time with a massive 734.5-point gain, but closed below the 20,000 mark. The SENSEX would close above the 20,000 mark for the first time on 11 December 2007. It took 42 days after reaching the 19,000 milestone to close above 20,000 points for the first time. The journey of the last 10,000 points was covered in just 483 sessions, compared to 7,297 sessions taken to touch the 10,000 mark from its base value of 100 points. In the second half of 2007 alone, the SENSEX reached six 1,000-point milestones.
==== Other uses ==== Sulfur fumigation could be used to disinfect wine barrels and prevent wine spoilage: In the mid-15th century, under the reign of Frederick III, several imperial decrees forbade the use of sulfur in wine barrels in Germany (thus implying that it was an attested practice). The ban was relaxed by his successor, Maximilian I. The practice then spread to France; in the 17th century, French wines were known to be sulfured when exported, French white wines being particularly affected. The Netherlands, importer of French wine, had their own sulfuring process using "allumettes hollandaises" (Dutch wicks), and were said to excessively sulfur the wine. That type of heavily sulfured wine was called "vin muet" in French, and "stomme" in Dutch, which both translate to "silent wine". Mixing some stomme with wine would make the wine sweeter, as well as making it last longer. However, as sulfuring was known to alter the taste and to potentially transfer impurities like arsenic to the wine, there were some health concerns around it. The Netherlands therefore decided to ban stomme in 1613, but the practice nevertheless perdured. In the late 18th century, furniture makers of German and Swiss origin in Pennsylvania, Maryland, Virginia and North Carolina used molten sulfur to produce decorative inlays. This type of inlay was mostly used on chests, schranks and clocks, but a wide range of surviving examples can be found, including tables, cupboards, cradles and many more.
Mohammed said al-Qaeda initially planned to target nuclear installations rather than the World Trade Center and the Pentagon, but decided against it, fearing things could "get out of control." Final decisions on targets, according to Mohammed, were left in the hands of the pilots. If any pilot could not reach his intended target, he was to crash the plane.
An indicative cost structure for a fine chemical company is shown in Table 10. Nowadays, a full 7-day/week operation, consisting of four or five shift teams, each working 8h per day, has become the standard. In terms of production costs, this is the most advantageous scheme. Higher salaries for night work are more than offset by better fixed cost absorption. As part of the budgeting process, standard costs for a production campaign of a particular fine chemical are determined on the basis of past experience. The actual results of the campaign are then compared with the standard. The capability of a fine chemical company to make dependable manufacturing cost forecasts is a distinct competitive advantage.
Sources: en.wikipedia.org
=== Calcium hydroxylapatite === Marketed as "Coaptite", this is spherical particles of calcium hydroxylapatite ceramic suspended in a sodium carboxylmethylcellulose, glycerine and water carrier gel. This is a synthetic version of a compound that is a normal component of bones and teeth. It is non-antigenic and noninflammatory. The particle size is in the range 75–125 μm and therefore should avoid migration away from the implant site. Once in place, the particles are enmeshed in a non-encapsulated stable soft collagen matrix. This matrix maintains volume even after the solid particles have been degraded and resorbed. The material is radio-opaque (and therefore will be visible on x-rays). It has been used in dental and orthopedic reconstructive surgery, and for replacement heart valves. In the field of plastic surgery, it is termed Radiance FNTM. As of 2022 only one publication exists. The material was used in submucosal injection site via transsphincteric route.
Feduccia's frill argument was followed up in several other publications, in which researchers interpreted the filamentous impressions around Sinosauropteryx fossils as remains of collagen fibres rather than primitive feathers. Since the structures are clearly external to the body, these researchers have proposed that the fibres formed a frill on the back of the animal and underside of its tail, similar to some modern aquatic lizards. The absence of feathers would refute the proposal that Sinosauropteryx is the most basal known theropod genus with feathers, and also raise questions about the current theory of feather origins itself. It calls into question the idea that the first feathers evolved not for flight but for insulation, and that they made their first appearance in relatively basal dinosaur lineages that later evolved into modern birds. Most researchers have disagreed with the identification of the structures as collagen or other structural fibres. Notably, the team of scientists that reported the presence of pigmentation cells in the structures argued that their presence proved the structures were feathers, not collagen, because collagen does not contain pigment. Gregory S. Paul reidentified what the collagen hypothesis's proponents consider a body outline outside of the fibres as an artefact of preparation: breakage and brushed-on sealant have been misidentified as the outline of the body. The hypothesis that the structures were collagen fibers was closely analyzed and disproven by a 2017 paper published by Smithwick et al.
Depending on the experimental conditions, cycloaddition of acetone and ketene produces either β-isovalerolactone or 4,4-dimethyloxetan-2-one, both of which hydrolyze under basic conditions to yield the conjugate base of HMB. The haloform reaction provides another pathway to HMB involving the exhaustive halogenation of the methyl-ketone region of diacetone alcohol with sodium hypobromite or sodium hypochlorite; Diacetone alcohol is readily available from the aldol condensation of acetone. An organometallic approach to HMB involves the carboxylation of tert-butyl alcohol with carbon monoxide and Fenton's reagent (hydrogen peroxide and ferrous iron). Alternatively, HMB can be prepared through microbial oxidation of β-methylbutyric acid by the fungus Galactomyces reessii.
AGIF Adipogenesis inhibitory factor Interleukin-11 precursor. Oprelvekin is produced in Escherichia coli (E. coli) by recombinant DNA technology. The protein has a molecular mass of approximately 19,000 g/mol, and is non-glycosylated. The polypeptide is 177 amino acids in length (the natural IL-11 has 178). This alteration has not resulted in measurable differences in bioactivity either in vitro or in vivo. The primary hematopoietic activity of Neumega is stimulation of megakaryocytopoiesis and thrombopoiesis. In mice and nonhuman primate studies Neumega has shown potent thrombopoietic activity in compromised hematopoiesis, including moderately to severely myelosuppressed animals. In these studies, Neumega improved platelet nadirs and accelerated platelet recoveries compared to controls. In animal studies oprelvekin also has non-hematopoietic activities. This includes the regulation of intestinal epithelium growth (enhanced healing of gastrointestinal lesions), the inhibition of adipogenesis, the induction of acute phase protein synthesis (e.g., fibrinogen), and inhibition of macrophageal released pro-inflammatory cytokines. However, pathologic changes, some also seen in humans, have been noticed:
Sources: en.wikipedia.org
Quantum mechanics is another domain where there is a continuity equation related to conservation of probability. The terms in the equation require the following definitions, and are slightly less obvious than the other examples above, so they are outlined here:
Famous Russian surgeon and scientist N. I. Pirogov was embalmed after his death in 1881. He was embalmed using the technique he himself developed. His body rests in a church in Vinnitsa, Ukraine. In contrast to the corpse of Lenin, which undergoes thorough maintenance in a special underground clinic twice a week, the body of Pirogov rests untouched and unchanging – reportedly only dust has to be brushed off of it. It rests at room temperature in a glass-lid coffin (while Lenin's body is preserved at a constant low temperature). Abraham Lincoln was embalmed after his assassination in 1865. To prevent anyone stealing Lincoln's body, Lincoln's eldest son Robert called for Lincoln's exhumation in 1901 to be buried in a concrete vault in the burial room of his tomb in Springfield, Illinois. Fearing that his body would have been stolen in the interim, Lincoln's coffin was opened, and his features were still recognizable, 36 years after his death. Rosalia Lombardo, who died at age one on 6 December 1920, was one of the last corpses to be interred in the Capuchin catacombs of Palermo, Sicily before the local authorities banned the practice. Nicknamed the 'Sleeping Beauty', Rosalia's body is still perfectly intact. Embalmed by Alfredo Salafia, she is in a glass case, looking very much like a surreal doll. Eva Perón was embalmed by Dr. Pedro Ara, as ordered by her husband Juan Perón. The body was preserved to look like it was in a sleep-like state.
===== Nobel Prize controversy ===== The 1923 Nobel Prize in Physiology awarded to Frederick Banting and John Macleod—publicly shared with Charles Best and James Collip, respectively—sparked controversy as to who was due credit "for the discovery of insulin". Early mass-reproduced accounts of the discovery often emphasized the role of Banting and Best's work, sidelining Macleod and Collip's contributions. This lopsided narrative persisted due to limited availability of documentary evidence and sustained differences in researchers' attitudes toward claiming recognition. During their lifetime, Banting (d. 1941) and Best (d. 1978) were more active—and in some ways, more obviously placed—than Macleod (d. 1935) and Collip (d. 1965) in emphasizing their contributions to the work. However, the criteria advanced to prioritize the pair's early work alone (before the extract was purified) would itself run into challenges in the 1960s and 1970s as attention was drawn to successes in the same year (Nicolae Paulescu) or earlier (George Ludwig Zuelzer, Israel Kleiner). As tends to be true of any scientific line of inquiry, "the discovery of a preparation of insulin that could be used in treatment" was made possible through the joint effort of team members, and built on the insight of researchers who came before them. In 1954, American doctor Joseph H. Pratt, whose lifelong interest in diabetes and the pancreas went back well before the Toronto discovery, published a "reappraisal" of Macleod and Collip's contributions in refining Banting and Best's flawed experiments and crude extract.
Sources: en.wikipedia.org
tesamorelin 属 GHRH 类似物，作用于垂体受体以促进内源生长激素释放；生长激素本身是直接补充的外源激素。两者在给药逻辑、作用位点和反馈调控路径上并不相同。
作为多肽，它难以通过胃肠道吸收，通常需要注射给药。口服会因消化酶降解而失去活性，因此文献中讨论的都是注射途径。
公开研究多集中在内脏脂肪、体成分分布以及与生长激素轴相关的代谢指标。长期安全性和在普通人群中的适用性尚缺乏一致结论。
Reconstituted solutions are kept cold and used within the period stated on the label or certificate. Repeated warming and cooling cycles should be avoided because they encourage aggregation and gradual loss of potency.