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1.
An iron-sulfur compound (Fe3S2) was synthesized at pressures greater than 14 gigapascals in the system Fe-FeS. The formation of Fe3S2 changed the melting relations from a simple binary eutectic system to a binary system with an intermediate compound that melted incongruently. The eutectic temperature in the system at 14 gigapascals was about 400°C lower than that extrapolated from Usselman's data, implying that previous thermal models of Fe-rich planetary cores could overestimate core temperature. If it is found in a meteorite, the Fe3S2 phase could also be used to infer the minimum size of a parent body. 相似文献
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Genome-wide insertional mutagenesis of Arabidopsis thaliana 总被引:2,自引:0,他引:2
Alonso JM Stepanova AN Leisse TJ Kim CJ Chen H Shinn P Stevenson DK Zimmerman J Barajas P Cheuk R Gadrinab C Heller C Jeske A Koesema E Meyers CC Parker H Prednis L Ansari Y Choy N Deen H Geralt M Hazari N Hom E Karnes M Mulholland C Ndubaku R Schmidt I Guzman P Aguilar-Henonin L Schmid M Weigel D Carter DE Marchand T Risseeuw E Brogden D Zeko A Crosby WL Berry CC Ecker JR 《Science (New York, N.Y.)》2003,301(5633):653-657
Over 225,000 independent Agrobacterium transferred DNA (T-DNA) insertion events in the genome of the reference plant Arabidopsis thaliana have been created that represent near saturation of the gene space. The precise locations were determined for more than 88,000 T-DNA insertions, which resulted in the identification of mutations in more than 21,700 of the approximately 29,454 predicted Arabidopsis genes. Genome-wide analysis of the distribution of integration events revealed the existence of a large integration site bias at both the chromosome and gene levels. Insertion mutations were identified in genes that are regulated in response to the plant hormone ethylene. 相似文献
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Further our previous study on the hair damages, this paper investigated the effect of three different hair damaging treatments
on the coloration effect with an oxidizing semi-permanent colorant. The three damaging treatments are (i) sunlight (simulated
by Xenon light), (ii) perming, and (iii) bleaching. The colour uptake was evaluated differently with conventional method by
CIE L*a*b* system of equation. In addition, the colour fastness properties of colored hairs to different simulated daily treatment
such as (i) hair washing, (ii) hair perming, (iii) sunlight exposure, and (iv) swimming in the sea were also examined. Based
on the experimental results, It could be concluded that the hair treatment with bleaching could improve the colouring performance
because of the elimination of melanin from hair. Meanwhile, the colour fastness properties of the colored hair under different
colour fastness testing conditions were getting worse with respect to the increasing degree of damaging treatment. 相似文献
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Yamada K Lim J Dale JM Chen H Shinn P Palm CJ Southwick AM Wu HC Kim C Nguyen M Pham P Cheuk R Karlin-Newmann G Liu SX Lam B Sakano H Wu T Yu G Miranda M Quach HL Tripp M Chang CH Lee JM Toriumi M Chan MM Tang CC Onodera CS Deng JM Akiyama K Ansari Y Arakawa T Banh J Banno F Bowser L Brooks S Carninci P Chao Q Choy N Enju A Goldsmith AD Gurjal M Hansen NF Hayashizaki Y Johnson-Hopson C Hsuan VW Iida K Karnes M Khan S Koesema E Ishida J Jiang PX Jones T Kawai J Kamiya A Meyers C Nakajima M 《Science (New York, N.Y.)》2003,302(5646):842-846
6.
Randriamampionona D Diallo B Rakotoniriana F Rabemanantsoa C Cheuk K Corbisier AM Mahillon J Ratsimamanga S El Jaziri M 《Fitoterapia》2007,78(7-8):482-489
A comparative quantitative analysis of the active triterpenoids in Centella asiatica samples collected in different locations in Madagascar was carried out to evaluate the natural variability in triterpenoid content and to select elite samples for further ex situ germplasm conservation and clonal propagation. The highest asiaticoside content (6.42%) was measured in samples collected in Mangoro region. In vitro propagation of C. asiatica was successfully achieved in hormone-free medium. Although lower asiaticoside content was detected in 8-week-old vitro plants, the Mangoro sample still showed the highest content in this triterpenoid constituent (1.78%). Acetoxycentellynol, a C(15)-polyacetylene, was found to be accumulated up to 18 times more in in vitro plants as compared to plant material collected in situ. 相似文献
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Recent syntheses of high-pressure alkali and alkaline earth silicates reveal a class of framework structures with corner-linked 4- and 6-coordinated silicon. These compounds possess the structural formula (A4-2x1+Bx2+)SimVI(SinIVO2(m+n)+2), where x, m, and n specify the amounts of alkaline earth, 6-coordinated silicon, and 4-coordinated silicon, respectively. Appropriate values of m and n yield a range of high-pressure structures, from fully 4-coordinated to fully 6-coordinated silicate frameworks. Recognition of this class of framework silicates leads to predictions of high-pressure structures as well as room-pressure isomorphs of high-pressure silicates. 相似文献
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S. Y. Cheng C. W. M. Yuen C. W. Kan K. K. L. Cheuk J. C. O. Tang S. Y. Li 《Fibers and Polymers》2009,10(1):132-140
In recent years, textile materials have also found applications in the cosmetic field as more and more commercial cosmetic
textile agents are now available in the market. In this paper, one commercially available cosmetic textile agent (CTA) for
skin caring benefits was used for making the cosmetic textiles. Systematic characterization methods were established to assess
their performance in terms of material identification, fabric performance properties as well as biological safety and biological
response to human skin. The experimental results showed that after the treatment of cosmetic textile agent, the fiber surface
was covered with a thin layer of smooth material, thereby contributing several alterations to fabric properties and providing
a better hand feel to human body. The durability of cosmetic textile was considerably satisfactory with respect to the abrasion
resistance and washing cycles. The experimental results also illustrated that the cosmetic textiles might probably enhance
the replacement of cells with the newly regenerated ones in the skin structure of human body, and thus provided a more efficient
turning-over and replacement of skin components. 相似文献
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Fermi gases, collections of fermions such as neutrons and electrons, are found throughout nature, from solids to neutron stars. Interacting Fermi gases can form a superfluid or, for charged fermions, a superconductor. We have observed the superfluid phase transition in a strongly interacting Fermi gas by high-precision measurements of the local compressibility, density, and pressure. Our data completely determine the universal thermodynamics of these gases without any fit or external thermometer. The onset of superfluidity is observed in the compressibility, the chemical potential, the entropy, and the heat capacity, which displays a characteristic lambda-like feature at the critical temperature T(c)/T(F) = 0.167(13). The ground-state energy is 3/5ξN E(F) with ξ = 0.376(4). Our measurements provide a benchmark for many-body theories of strongly interacting fermions. 相似文献
10.
Mirja Kaizer Ahmmed Shuva Bhowmik Stephen G. Giteru Md. Nazmul Hasan Zilani Parise Adadi Shikder Saiful Islam Osman N. Kanwugu Monjurul Haq Fatema Ahmmed Charlene Cheuk Wing Ng Yau Sang Chan Md. Asadujjaman Gabriel Hoi Huen Chan Ryno Naude Alaa El-Din Ahmed Bekhit Tzi Bun Ng Jack Ho Wong 《Marine drugs》2022,20(7)
Lectins are a unique group of nonimmune carbohydrate-binding proteins or glycoproteins that exhibit specific and reversible carbohydrate-binding activity in a non-catalytic manner. Lectins have diverse sources and are classified according to their origins, such as plant lectins, animal lectins, and fish lectins. Marine organisms including fish, crustaceans, and mollusks produce a myriad of lectins, including rhamnose binding lectins (RBL), fucose-binding lectins (FTL), mannose-binding lectin, galectins, galactose binding lectins, and C-type lectins. The widely used method of extracting lectins from marine samples is a simple two-step process employing a polar salt solution and purification by column chromatography. Lectins exert several immunomodulatory functions, including pathogen recognition, inflammatory reactions, participating in various hemocyte functions (e.g., agglutination), phagocytic reactions, among others. Lectins can also control cell proliferation, protein folding, RNA splicing, and trafficking of molecules. Due to their reported biological and pharmaceutical activities, lectins have attracted the attention of scientists and industries (i.e., food, biomedical, and pharmaceutical industries). Therefore, this review aims to update current information on lectins from marine organisms, their characterization, extraction, and biofunctionalities. 相似文献