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Polymer Classification: Stereospecificity01:26

Polymer Classification: Stereospecificity

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Polymerization generates chiral centers along the entire backbone of a polymer chain. Accordingly, the stereochemistry of the substituent group has a significant effect on polymer properties. Polymers formed from monosubstituted alkene monomers feature chiral carbons at every alternate position in the polymer backbone. Relative to the predominant orientation of substituents at the adjacent chiral carbons, the polymer can exist in three different configurations: isotactic, syndiotactic, and...
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Factors Affecting Dissolution: Polymorphism, Amorphism and Pseudopolymorphism01:21

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Polymorphism refers to the existence of a drug substance in multiple crystalline forms, known as polymorphs. Recently, this term has been expanded to include solvates (forms containing a solvent), amorphous forms (non-crystalline forms), and desolvated solvates (forms from which the solvent has been removed).
Some polymorphic crystals possess lower aqueous solubility than their amorphous counterparts, leading to incomplete absorption. For instance, the oral suspension of Chloramphenicol, which...
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Segregation in Fresh Concrete01:16

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Segregation in fresh concrete is a phenomenon where the components of the concrete mix separate, leading to uneven distribution and compromised structural integrity. This separation typically occurs when concrete is subjected to excessive horizontal movement within forms, or when it is dropped from considerable heights or forced through narrow, winding paths. As a result, heavier coarse aggregate particles settle at the bottom, while lighter, finer materials such as cement and water rise to the...
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Law of Segregation

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When crossing pea plants, Mendel noticed that one of the parental traits would sometimes disappear in the first generation of offspring, called the F1 generation, and could reappear in the next generation (F2). He concluded that one of the traits must be dominant over the other, thereby causing masking of one trait in the F1 generation. When he crossed the F1 plants, he found that 75% of the offspring in the F2 generation had the dominant phenotype, while 25% had the recessive phenotype.
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While Mendel’s Law of Segregation states that the two alleles for one gene are separated into different gametes, a different question of how different genes are inherited remains. For example, is the gene for tall plants inherited with the gene for green peas? Mendel asked this question by experimenting with a dihybrid cross; a cross in which both parents are homozygous for two distinct traits resulting in an F1 generation that are heterozygous for both traits.
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Updated: May 16, 2025

Following the Dynamics of Structural Variants in Experimentally Evolved Populations
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在N,N,N,N,N',N'-Tetramethylbenzidine-TCNQF4电荷转移复合体中的混合与分离堆多态.

Elena Ferrari1,2, Francesco Mezzadri1, Matteo Masino1

  • 1Dipartimento di Scienze Chimiche, della Vita e della Sostenibilità Ambientale & INSTM-UdR Parma, Parco Area delle Scienze, 17/A, Parma 43124, Italy.

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PubMed
概括

研究人员使用N-TMB和TCNQF4开发了一种新的有机电荷转移 (CT) 共晶体,该共晶体表现出混合和分离堆结构. 这一发现扩大了对CT晶体多态性和材料设计的理解.

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科学领域:

  • 材料科学 材料科学 材料科学
  • 固态化学 固态化学
  • 晶体学 晶体学是指结晶学.

背景情况:

  • 有机电荷转移 (CT) 共同晶体是由供体 (D) 和受体 (A) 分子组成的1D材料.
  • 这些材料通常呈现分离 (单独的D/A列) 或混合 (交替的D-A) 堆图案.
  • CT晶体中的多态性是常见的,但共存的混合和分离的堆相很少见.

研究的目的:

  • 合成和表征一种新的有机CT共晶体,表现出混合和分离的堆相.
  • 研究这些共存相的结构和光学特性.
  • 为了探索在低温下分离阶段的潜在堆扭曲.

主要方法:

  • 使用N-TMB (捐赠者) 和TCNQF4 (接受者) 合成一种新的CT复合体.
  • 单晶X射线衍射用于结构分析.
  • 极化红外 (IR) 和拉曼光谱用于光学表征.

主要成果:

  • 成功合成了N-TMB和TCNQF4的新CT复合体,显示了混合和分离的堆图案.
  • 使用光谱学和X射线衍射,在混合和分离相之间确定了共同的结构和光学特性.
  • 低温数据表明,分离堆阶段内存在堆扭曲.

结论:

  • 这项研究提供了一个罕见的有机CT共晶体的例子,该共晶体表现出混合和分离的堆相.
  • 这些发现突出了设计材料具有可调节结构图案的潜力.
  • 在分离阶段观察到的堆扭曲值得进一步调查其电子影响.