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Particle physicists see neutrons as tiny massive particles with a confinement radius of about 0.7 fm and a distinct internal quark gluon structure. In quantum mechanics, neutrons are described by wave packets whose spatial extent may become ten orders of magnitude larger than the confinement radius, and can even reach macroscopic dimensions, depending on the degree of monochromaticity. For neutrons passing through narrow slits, it has been predicted that quantization of the transverse momentum component changes the longitudinal momentum component, resulting in a phase shift that should be measurable using interferometric methods. Here we use neutron interferometry to measure the phase shift arising from lateral confinement of a neutron beam passing through a narrow slit system. The phase shift arises mainly from neutrons whose classical trajectories do not touch the walls of the slits. In this respect, the non-locality of quantum physics is apparent. 相似文献
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D Baron C Danglot R Vilaginés 《Comptes rendus des séances de l'Académie des sciences. Série D, Sciences naturelles》1980,291(7):629-632
The trophozo?ts of Acanthamoeba castellanii are unable to adsorb poliovirus or vesicular stomatitis Virus. After encystment in medium containing respectively 5.4 x 10(8) and 3 x 10(9) P.F.U./ml cysts did not contain Viruses. These data do not agree with a current hypothesis by which water's free Amoeba could carry animal Viruses. 相似文献
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Zusammenfassung Injektion von Sekretin ruft bei normalen Versuchspersonen Diuresis und Vermehrung der Natrium- und Alkali-Ausscheidung hervor. Diese Wirkungen sind vermindert bei Patienten mit chronischer Pankreaserkrankung. Der mögliche Mechanismus und die praktische Bedeutung dieser Beobachtungen werden diskutiert.
Supported successively by grants from the Royal Free Hospital Endowment Fund. 相似文献
Supported successively by grants from the Royal Free Hospital Endowment Fund. 相似文献
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L. S. Baron 《Cellular and molecular life sciences : CMLS》1955,11(7):268-268
Zusammenfassung Enzymatische Aktivitäten in V-Stämmen vonSalmonella typhosa wurden mit solchen in W-Stämmen, welche aus V-Kulturen isoliert worden waren, verglichen. Die Aktivitäten in V- und W-Formen gleicher Stämme waren identisch und sind daher unabhängig vom Vorhandensein oder Fehlen des Vi-Antigens. 相似文献
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Summary The solutions of monoamineoxidase from rat liver mitochondria can be inactivated by a longlasting dialysis. The addition of cupric ions to these inactive preparations allows a complete reactivation. 相似文献
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Activation by agonist binding of G-protein-coupled receptors (GPCRs) controls most signal transduction processes. Although these receptors span the cell membrane, they are not considered to be voltage sensitive. Recently it was shown that both the activity of GPCRs and their affinity towards agonists are regulated by membrane potential. However, it remains unclear whether GPCRs intrinsically respond to changes in membrane potential. Here we show that two prototypical GPCRs, the m2 and m1 muscarinic receptors (m2R and m1R), display charge-movement-associated currents analogous to 'gating currents' of voltage-gated channels. The gating charge-voltage relationship of m2R correlates well with the voltage dependence of the affinity of the receptor for acetylcholine. The loop that couples m2R and m1R to their G protein has a crucial function in coupling voltage sensing to agonist-binding affinity. Our data strongly indicate that GPCRs serve as sensors for both transmembrane potential and external chemical signals. 相似文献