The evolutionary history of crustacean segmentation: A fossil-based perspective Summary The evolution of segmentation in Crustacea, that is, the formation of sclerotized and jointed body somites and arrangement of somites into tagmata,... D Waloszek,A Maas - 《Evolution & Development》 被引量: ...
Moreover, 86.95% (9.35 Gb) of the assembly was annotated as repetitive elements (Supplementary Table 6), which is higher than previously reported genomes of barley (80.80%)16 and bread wheat (84.70%)9. Table 1 Genome assembly statistics for the diploid, tetraploid and hexaploid Avena ...
Three minutes into the cosmological Big Bang, the composition of the universe consisted of 1 H, 2 H, 3 He, 4 He, and 7 Li, with only trace amounts of other elements. The synthesis of all heavier elements awaited the formation and evolution of the first stars, some hundreds of millions...
Some of the most extensive terrestrial biomes today consist of open vegetation, including temperate grasslands and tropical savannas. These biomes originated relatively recently in Earth’s history, likely replacing forested habitats in the second half of the Cenozoic. However, the timing of their orig...
Astronomers' research on star formation ___ us understand the origin of elements, which ___ important for many fields such as materials science. A. help; is B. helps; are C. helped; was D. helping; were 相关知识点: 试题来源: 解析 A。解析:第一个空,主语Astronomers' research是单数,一...
(with slight change) any word really needed to name some new object or to denote some new process. Words from more than 350 languages have entered English in this way. Like French, Spanish, and Russian, English frequently forms scientific terms from Classical Greek word elements. Although a ...
The universe began as a hot, dense region of radiant energy about 14 billion years ago. It cooled and expanded immediately after formation, creating the lightest and most plentiful elements: hydrogen and helium. This process also created trace amounts oflithium. ...
Most metal and sulfide in chondrules was probably present in the solar nebula before chondrule formation; most siderophile and chalcophile elements were in these materials. Some Fe was also in silicates, as were minor amounts of Ni, Co, Au, Ge and possibly Se. The amount of metal formed ...
the methylation level of theMdMYB1promoter determines apple color in color bud mutants. The formation of apple red buds is caused by the demethylation of theMdMYB1promoter. Additional research is required to identify the gene(s) involved in the demethylation process and how to recognize such loc...
Formation of cratonic lithosphere: an integrated thermal and petrological model. Lithos 149, 4–15 (2012). Article ADS CAS Google Scholar Buick, R. et al. Record of emergent continental crust ∼3.5 billion years ago in the Pilbara Craton of Australia. Nature 375, 574–577 (1995). ...