منابع مشابه
Variations in frequencies of drug resistance in Plasmodium falciparum.
Continual exposure of malarial parasite populations to different drugs may have selected not only for resistance to individual drugs but also for genetic traits that favor initiation of resistance to novel unrelated antimalarials. To test this hypothesis, different Plasmodium falciparum clones having varying numbers of preexisting resistance mechanisms were treated with two new antimalarial age...
متن کاملPhasic Variations in Peripheral Coronary Resistance and Their Determinants
Information regarding the successive changes of resistance in the coronary branches and their determinantIs is of paramount importance both in understanding the phasic changes of coronary flow and in interpreting the actions of drugs upon the intact coronary circulation. It seemed that a study of the pressure pulse from the peripheral end of a coronary vessel (peripheral coronary pressureP.C.P....
متن کاملTransformation and detwinning induced electrical resistance variations in NiTiCu
Utilizing electrical resistance measurements in combination with strain observations on single crystals, it was possible to distinguish the austenite to martensite transformation from the detwinning of the martensite behavior during deformation of NiTiCu shape memory alloys. It was found that the electrical resistance change associated with the detwinning of the martensite variants was as high ...
متن کاملWithin-breath variations of forced oscillation resistance in healthy subjects.
Respiratory resistance (Rrs) was measured by the forced oscillation technique at 10, 20 and 30 Hz in 54 healthy subjects. The sinusoidal pressure oscillations were applied around the head, rather than at the mouth, so as to minimize transmural pressure across extrathoracic airway walls and the corresponding artefact (Peslin et al., J Appl Physiol, 1985, 59, 1790-1795). The flow (V') and volume ...
متن کاملThermal Resistance Variations of Fly Ash Geopolymers: Foaming Responses
This paper presents a comparative study of the characteristic of unfoamed and foamed geopolymers after exposure to elevated temperatures (200-800 °C). Unfoamed geopolymers were produced with Class F fly ash and sodium hydroxide and liquid sodium silicate. Porous geopolymers were prepared by foaming with hydrogen peroxide. Unfoamed geopolymers possessed excellent strength of 44.2 MPa and degrade...
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ژورنال
عنوان ژورنال: Science
سال: 1893
ISSN: 0036-8075,1095-9203
DOI: 10.1126/science.ns-21.528.150