一个含有异的中性基因,HXeOO
Leonid Khriachtchev1, Mika Pettersson, Jan Lundell
1Laboratory of Physical Chemistry, FIN-00014 University of Helsinki, Finland.
Journal of the American Chemical Society
|February 6, 2003
概括
研究人员使用紫外线光解和热动员制造了一种新型含分子HXeO. 这一在贵重气体化学中的突破性发现揭示了HXeO的内在稳定性,为相关物种开辟了道路.
科学领域:
- 无机化学 无机化学
- 物理化学 物理化学
- 频谱学是一种光谱学.
背景情况:
- 由于其不寻常的结合特性,高贵气体化合物具有显著的兴趣.
- 对开物种的研究提供了对化学反应性和稳定性的洞察.
- 的独特电子结构允许新型化学键的形成.
研究的目的:
- 合成和描述一种新的含有的开物种,特别是HXeO.
- 为了研究HXeO分子的稳定性和结合性.
- 探索创造相关的贵重气体化物 (如HKrO和HArO) 的潜力.
主要方法:
- 在低温 (7K) 条件下对H(2) O/Xe或N(2) O/HBr/Xe固体混合物的紫外线光解.
- 在高于或等于30K的温度下氧原子的热调动.
- 红外光谱检测H-Xe拉伸吸收.
- Ab initio计算以确定HXeO的电子结构和粘合.
主要成果:
- 成功地准备了开的HXeO ((2) Sigma) 种类.
- 在固体Xe中,在1466.1厘米的H-Xe拉伸吸收带的识别.
- 在化 (DXeO) 时观察到显著的光谱转移到1070.3cm(-1).
- 理论计算证实了HXeO的内在稳定性,将其归因于联合的离子和共价键.
结论:
- HXeO基的形成表明了氧原子在固体中稳定和移动性的情况.
- 这项研究为HXeO固有的稳定性提供了有力的证据,挑战了关于贵重气体化学的先前假设.
- 这些发现表明,类似的轻贵气化物,如HKrO和HArO,也可能是稳定和可合成的.
相关概念视频
X-linked Traits
In most mammalian species, females have two X sex chromosomes and males have an X and Y. As a result, mutations on the X chromosome in females may be masked by the presence of a normal allele on the second X. In contrast, a mutation on the X chromosome in males more often causes observable biological defects, as there is no normal X to compensate. Trait variations arising from mutations on the X chromosome are called “X-linked”.
X and Y Chromosomes
Among mammals, the gender of an organism is determined by the sex chromosomes. Humans have two sex chromosomes, X and Y. Every human diploid cell has 22 pairs of autosomes and one pair of sex chromosomes. A human female has two X chromosomes, while a male has one X chromosome and one Y chromosome.
The germline cells such as egg and sperm cells carry only half the number of chromosomes, i.e., 22 autosomes and one sex chromosome. All eggs have an X chromosome, while sperm cells can carry an X or...
The germline cells such as egg and sperm cells carry only half the number of chromosomes, i.e., 22 autosomes and one sex chromosome. All eggs have an X chromosome, while sperm cells can carry an X or...
X-linked Traits
In most mammalian species, females have two X sex chromosomes and males have an X and Y. As a result, mutations on the X chromosome in females may be masked by the presence of a normal allele on the second X. In contrast, a mutation on the X chromosome in males more often causes observable biological defects, as there is no normal X to compensate. Trait variations arising from mutations on the X chromosome are called “X-linked”.
Exon Recombination
The evolution of new genes is critical for speciation. Exon recombination, also known as exon shuffling or domain shuffling, is an important means of new gene formation. It is observed across vertebrates, invertebrates, and in some plants such as potatoes and sunflowers. During exon recombination, exons from the same or different genes recombine and produce new exon-intron combinations, which might evolve into new genes.
Exon shuffling follows “splice frame rules.” Each exon has three reading...
Exon shuffling follows “splice frame rules.” Each exon has three reading...
Heterochromatin
The extent of chromatin compaction can be studied by staining chromatin using specific DNA binding dyes. Under the microscope, the dense-compacted regions that take up more dye are called heterochromatin. Heterochromatin is further classified into two forms – constitutive heterochromatin and facultative heterochromatin.
Constitutive heterochromatin: It is a highly compact region of chromatin that is mostly concentrated in the centromere and telomere. Unlike euchromatin, the amino acid at 9th...
Constitutive heterochromatin: It is a highly compact region of chromatin that is mostly concentrated in the centromere and telomere. Unlike euchromatin, the amino acid at 9th...
Heterochromatin
The extent of chromatin compaction can be studied by staining chromatin using specific DNA binding dyes. Under the microscope, the dense-compacted regions that take up more dye are called heterochromatin. Heterochromatin is further classified into two forms – constitutive heterochromatin and facultative heterochromatin.
Constitutive heterochromatin: It is a highly compact region of chromatin that is mostly concentrated in the centromere and telomere. Unlike euchromatin, the amino acid at 9th...
Constitutive heterochromatin: It is a highly compact region of chromatin that is mostly concentrated in the centromere and telomere. Unlike euchromatin, the amino acid at 9th...


