A practical reference on BDNF expression: what it is, how it behaves, what the literature reports, and where the honest uncertainties sit.
Reviewed 2025-11-02. Anything still debated is marked as such rather than presented as settled.
The mechanisms attributed to semax are inferred from animal and cell studies rather than traced to one confirmed target. The most frequently cited pathway involves increased expression of brain-derived neurotrophic factor and nerve growth factor in hippocampal and cortical tissue. Some work points to engagement of melanocortin receptors, particularly MC4, which the parent ACTH fragment can activate. Effects on dopaminergic and serotonergic signalling have also been reported. No single account explains all observed results, and the relative weight of each pathway remains unsettled.
Published studies examine a fairly narrow set of endpoints. Rodent experiments commonly measure maze learning, infarct volume after induced ischemia, and tissue levels of neurotrophic factors. Clinical reports from Russian centres describe attention, memory and recovery scores in patients after stroke or transient ischemic attack. Most of those human studies are small and few have been repeated by independent groups. Outcome measures differ between studies, which limits direct comparison.
Semax 是人工设计的七肽，序列为 Met-Glu-His-Phe-Pro-Gly-Pro，骨架取自促肾上腺皮质激素片段 ACTH(4-10)。它于二十世纪八十年代在苏联的分子遗传学研究机构内合成。设计目标是保留该片段与注意力和记忆相关的活性，同时剔除促皮质激素释放等内分泌作用。此后俄罗斯将其登记为药品并进入临床使用。
当时的短肽研究普遍关注能否穿越血脑屏障、在低剂量下产生中枢效应，Semax 属于这一路线。鼻内给药是其主要使用方式，俄语文献报道的适应症涵盖缺血性卒中、短暂性脑缺血发作、认知功能减退以及视神经病变。这些研究大多发表在当地期刊上，样本规模与终点设置同西方试验惯例存在差异，国际同行对其临床证据的强度看法不一。
| Property | Value | Notes |
|---|---|---|
| Appearance | White to off-white powder | Lyophilized solid from research suppliers |
| Solubility | Freely soluble in water | Also dissolves in aqueous buffers; solutions are used fresh |
| Typical storage temperature | -20 °C for lyophilized powder | Short-term transport at 2-8 °C is common |
| Common analytical method | Reverse-phase HPLC | Paired with mass spectrometry for identity confirmation |
| Common synonyms | ACTH(4-10) analogue; MEHFPGP | N-terminal methionine retained in the chain |
Once dissolved, the peptide is considerably less stable than the solid. Aqueous solutions are usually prepared at neutral to slightly acidic pH, filtered, and divided into single-use aliquots before freezing. Repeated freeze-thaw cycles are a common cause of avoidable loss and are best prevented by never refreezing a thawed aliquot. Adsorption to plastic and glass surfaces can lower the measured concentration of dilute solutions, particularly below roughly 0.1 mg/mL. Buffer choice, salt content, and container material all influence how much peptide remains detectable after storage.
Identity and purity are established with standard peptide methods. Reversed-phase HPLC with ultraviolet detection near 214 nm resolves the parent peak from deletion and truncation byproducts, and reports typically quote a main-peak percentage. Mass spectrometry by electrospray or MALDI-TOF confirms the expected molecular mass, while amino acid analysis or peptide mapping can verify composition when the sequence itself is in question. A certificate of analysis that pairs a chromatogram with a mass spectrum is more informative than a purity figure alone. Counter-ion content and residual solvents are separate specifications and are frequently omitted.
Semax 是一种人工合成的七肽，氨基酸序列为 Met-Glu-His-Phe-Pro-Gly-Pro，单字母缩写记作 MEHFPGP。它被归类为促肾上腺皮质激素片段 ACTH(4-10) 的结构类似物，但并不天然存在于生物体内。母体片段 ACTH(4-10) 的序列为 Met-Glu-His-Phe-Arg-Trp-Gly，Semax 替换了中间两个残基，并在羧基端延长了 Pro-Gly-Pro 三肽。这种延长被普遍认为能提升分子对肽酶的耐受性。
该化合物于二十世纪八十年代在俄罗斯被开发，相关工作由俄罗斯科学院分子遗传学研究所的研究团队主导。开发目标并非复制 ACTH 的完整激素活性，而是寻找保留其神经作用方向、同时去除促肾上腺皮质激素释放效应的短肽片段。研究记录显示，这一方向促成了多个相关短肽的合成与筛选，而 Semax 是其中被研究最广泛的一个。当地文献常以 Семакс 这一名称指代它。
研究兴趣主要集中在神经营养因子相关的路径上，包括脑源性神经营养因子与神经生长因子的表达变化。部分实验报告称在特定条件下观察到这些因子的水平上升，但具体信号通路和剂量依赖关系仍未完全厘清。多数公开数据来自细胞模型和动物实验，人体对照研究数量有限。因此，该化合物的作用机制在文献中属于活跃讨论，而非已经确立的定论。
=== Druze perspective on Christianity === The Epistles of Wisdom present a unique perspective on religions and philosophies, including Christianity and Islam, offering insights and interpretations that reflect the beliefs and teachings of the Druze faith. These epistles delve into various aspects of Christianity, including the role of Jesus, the Gospel writers, and Christian doctrine. They also address Christian scriptures and teachings from the perspective of Druze theology, highlighting points of convergence and divergence between the two faiths. Overall, the Epistles of Wisdom provide offer an examination of religions and philosophies, including Christianity and Islam, from the viewpoint of Druze philosophy and spirituality. Christian-friendly content is present in Druze literature, such as the Epistles of Wisdom. In epistles 53–55 of the third volume, it teaches that Christianity should be "esteemed and praised" by Druze believers, with the four evangelists being described as "carriers of wisdom". Another epistle mentions that al-Hakim bi-Amr Allah will judge humanity on Yom ed-Din, the "Last Judgment", which will occur after the overthrow of all kings, the prevalence of Christianity over Islam, the destruction of Mecca by fire, and the rise of a vast army of reincarnated Druze individuals to rule the world. According to this belief, only four religious communities will survive this judgment: Ahl al-Tawhīd [the Druze], Jews, Christians, and those who were once Muslims but have since abandoned Islam.
Jung's work on himself and his patients convinced him that life has a spiritual purpose beyond material goals. The main task for people, he believed, is to discover and fulfill their deep, innate potential. Based on his study of Christianity, Hinduism, Buddhism, Gnosticism, Taoism, and other traditions, Jung believed this journey of transformation, which he called individuation, is at the mystical heart of all religions. It is a journey to meet the self and at the same time to meet the Divine. Unlike Freud's atheistic worldview, Jung's pantheism may have led him to believe that spiritual experience was essential to well-being, as he specifically identifies individual human life with the universe as a whole. In 1959, Jung was asked by the host, John Freeman, on the BBC interview program Face to Face whether he believed in God, to which Jung answered, "I do not need to believe. I know." Jung's ideas on religion counterbalance Freudian skepticism. Jung's idea of religion as a practical road to individuation is still treated in modern textbooks on the psychology of religion, though his ideas have been criticized. Jung recommended spirituality as a cure for alcoholism, and is considered to have had an indirect role in establishing Alcoholics Anonymous. Jung treated an American patient named Rowland Hazard III who had chronic alcoholism. After working with the patient for some time and achieving no significant progress, Jung told the man that his alcoholic condition was near hopeless, save only the possibility of a spiritual experience.
== Posthumous recognition == In 1959 she became the first woman elected to the Poultry Historical Society Hall of Fame. She was inducted into the National Women's Hall of Fame in 2002, the American Society of Heating, Refrigerating and Air-Conditioning Engineers Hall of Fame in 2007, and the National Inventors Hall of Fame in 2018.
Sources: en.wikipedia.org
Li R, Bianchet MA, Talalay P, Amzel LM (1995). "The three-dimensional structure of NAD(P)H:quinone reductase, a flavoprotein involved in cancer chemoprotection and chemotherapy: mechanism of the two-electron reduction". Proc. Natl. Acad. Sci. U.S.A. 92 (19): 8846–50. Bibcode:1995PNAS...92.8846L. doi:10.1073/pnas.92.19.8846. PMC 41064. PMID 7568029.
== History == It was first used in 1795 shortly after the formation of the Orange Order and was the original system put together by the founding members of the Orange Order. The Grand Orange Lodge of Ireland disliked the ritualism and tried to suppress it as early as 1798 however, the main reason for the opposition to the Royal Arch Purple Degree was that many rural Lodges were practising other degrees in addition to the Royal Arch Purple degree and the gentry deemed this as unacceptable and realised the need for a central system of degrees. The Royal Arch Purple degree was practised in secrecy for a period after the Grand Lodge (in Dublin) deemed the degree illegal, however it was kept alive by the Lodges around County Armagh as it was the system of 'travel' closest to the original ritual put together by the founding members of the Orange Order in 1795. The Grand Lodge maintains their position in not recognising the degree to this day although it now, rather grudgingly, recognises the Royal Arch Purple as an official Order. It was re-constituted in 1911, with the explicit intentions of promoting the Reformed Faith, Charity amongst all men and maintaining historic Orangeism. It was granted its Royal title by the Duke of Cumberland, King Ernest Augustus of Hanover, who was the fifth son of King George III, and brother to King George IV and King William IV, whom he succeeded as King of Hanover.
== Treatment == Treatment is predominantly preventive. Avoidance of topical phenols and diets low in tyrosine may help. Replacement and repair of damaged tissue is also possible. Hydroquinone-induced exogenous ochronosis is an avoidable dermatosis that is exceedingly difficult to treat. However, some studies show that treatment may be possible with a Q-switched alexandrite (755 nm) laser. Individuals with this disorder are recommended to stop using hydroquinone-containing compounds. Awareness of this is important, as dermatologists may think the symptoms a patient is exhibiting are a melasma, and prescribe a hydroquinone-containing cream.
Observers noted that thallus form—crusty, leafy, or shrubby—could vary within a lineage under different environments or slight genetic shifts. By contrast, spore traits and thecium structure stayed constant and resisted ecological plasticity. Watson (1929) argued that reproductive parts deserve priority: they belong solely to the fungus, whereas thallus form—shaped by both partners—can mislead. Field keys of the era highlighted spore colour (hyaline vs. brown), septation (simple, muriform, etc.), ascus type, and chemical spot tests to sort genera and families. Thallus form still appeared, but only as a secondary cue once the "primary" traits had fixed a specimen's position. This fungal focus flowed directly from the dual hypothesis: lichens were now viewed as fungi first. Accepting lichens as fungi raised a nomenclatural riddle: does the word "lichen" refer to the whole consortium or only to the fungal partner? In 1913 Bruce Fink declared that "the lichen is a fungus pure and simple", framing the issue in stark terms. A more radical solution arrived in the 1950s when Raffaele Ciferri and Ruggero Tomaselli proposed parallel names for the cultured fungal partner, adding the suffix ‑myces (e.g. Cladoniomyces for the Cladonia mycobiont). Their scheme ran straight into the newly adopted Stockholm Code (1952), which already covered lichens under the International Code of Botanical Nomenclature, and the –myces names were soon ruled illegitimate.
Sources: en.wikipedia.org
In July 2020, Lupin Pharmaceuticals pulled all lots (batches) of metformin after discovering unacceptably high levels of NDMA in tested samples. In August 2020, Bayshore Pharmaceuticals recalled two lots of tablets. The FDA issued revised guidelines about nitrosamine impurities in September 2024.
====== Fatty acid ethoxylates ====== Fatty acid ethoxylates are a class of very versatile surfactants, which combine in a single molecule the characteristic of a weakly anionic, pH-responsive head group with the presence of stabilizing and temperature responsive ethyleneoxide units.
As noted above, for small deformations, most elastic materials such as springs exhibit linear elasticity and can be described by a linear relation between the stress and strain. This relationship is known as Hooke's law. A geometry-dependent version of the idea was first formulated by Robert Hooke in 1675 as a Latin anagram, "ceiiinosssttuv". He published the answer in 1678: "Ut tensio, sic vis" meaning "As the extension, so the force", a linear relationship commonly referred to as Hooke's law. This law can be stated as a relationship between tensile force F and corresponding extension displacement
Sources: en.wikipedia.org
It consists mainly of animal experiments and small clinical reports, with much of the clinical material published in Russian-language journals. Large independent trials are scarce. Separating reliable effects from chance findings is consequently difficult.
A fraction of an intranasal dose is thought to reach the central nervous system, and this route is favoured partly for that reason. The proportion is not well characterized. Direct measurement in humans remains difficult with current methods.
Raised BDNF and NGF expression has been reported across several animal studies, which makes the signal fairly consistent. Whether the same change occurs in humans at usable doses is not established. It is best treated as a working hypothesis rather than a confirmed clinical mechanism.
不存在。它是依据 ACTH 的一段序列人工设计的分子，天然蛋白质中找不到与之完全相同的七肽。名称属于研究代号，而非天然物质名。