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Dimensional reduction of gravity and Yang-Mills theories imply different length scales for the respective compactified spaces. It is argued that, if spontaneous compactification indeed occurs intwo or more hierarchical steps then this implies either (1) the existence of a superweak Yang-Mills or Yang-Mills-Higgs interaction if gravity couples universally to all matter or (2) a violation of gravitational universality, or a situation intermediate between (1) and (2). 相似文献
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Adlerberth Josefin Meng Qinglai Mecklenburg Michael Tian Zengmin Zhou Yikai Bülow Leif Xie Bin 《Journal of Thermal Analysis and Calorimetry》2020,140(2):763-771
Journal of Thermal Analysis and Calorimetry - Real-time monitoring of patient’s blood metabolites, such as glucose and lactate, could potentially improve surgery and recovery outcomes for... 相似文献
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Polysulfides as biologically active ingredients of garlic 总被引:2,自引:0,他引:2
Garlic has long been considered as a natural remedy against a range of human illnesses, including various bacterial, viral and fungal infections. This kind of antibiotic activity of garlic has mostly been associated with the thiosulfinate allicin. Even so, recent studies have pointed towards a significant biological activity of trisulfides and tetrasulfides found in various Allium species, including a wide range of antibiotic properties and the ability of polysulfides to cause the death of certain cancer cells. The chemistry underlying the biological activity of these polysulfides is currently emerging. It seems to include a combination of several distinct transformations, such as oxidation reactions, superoxide radical and peroxide generation, decomposition with release of highly electrophilic S(x) species, inhibition of metalloenzymes, disturbance of metal homeostasis and membrane integrity and interference with different cellular signalling pathways. Further research in this area is required to provide a better understanding of polysulfide reactions within a biochemical context. This knowledge may ultimately form the basis for the development of 'green' antibiotics, fungicides and possibly anticancer agents with dramatically reduced side effects in humans. 相似文献
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I. Bellucci G. Savoia Werner Mecklenburg O. Ruff G. Landschke L. Weiss E. Wedekind H. Rheinhold H. Wilke G. Steiger P. Nicolardot A. Réglade H. Pape A. B. Schiötz J. Brown H. T. Madden G. E. F. Lundell J. I. Hoffmann Magdalene Hüniger H. B. Knowles A. Travers J. A. Holladay und A. Cathrein 《Fresenius' Journal of Analytical Chemistry》1925,66(1-2):55-71
Ohne Zusammenfassung 相似文献
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A model of electrons hopping from atom to atom in graphene's honeycomb lattice gives low-energy electronic excitations that obey a relation formally identical to a 2+1 dimensional Dirac equation. Graphene's spin equivalent, "pseudospin," arises from the degeneracy introduced by the honeycomb lattice's two inequivalent atomic sites per unit cell. Previously it has been thought that the usual electron spin and the pseudospin indexing the graphene sublattice state are merely analogues. Here we show that the pseudospin is also a real angular momentum. This identification explains the suppression of electron backscattering in carbon nanotubes and the angular dependence of light absorption by graphene. Furthermore, it demonstrates that half-integer spin like that carried by the quarks and leptons can derive from hidden substructure, not of the particles themselves, but rather of the space in which these particles live. 相似文献