Results 81 to 90 of about 3,517 (303)
Linear numeration systems of order two
, 1988 A numeration system is a sequence of integers such that any integer can be represented by means of the sequence using integers of bounded size. We study numeration systems defined by linear recurrences of order two.
Frougny, Christiane
core +1 more source
Revista Latinoamericana de Etnomatemática, 2016 We present findings from a research project aimed at developing instructional resources to support the learning with understanding of the numeration systems of Mexican indigenous languages.
José Luis Cortina +1 more
doaj
Specific language impairment as a syntax-phonology (PF) interface problem: evidence from Afrikaans
Stellenbosch Papers in Linguistics, 2012 A theoretical account of specific language impairment (SLI) – one which places the locus of the impairment at Spell-Out at the syntax-phonology interface – is proposed and then tested against utterances from Afrikaans-speaking children with SLI ...
Corver, Norbert +2 more
doaj +1 more source
pH‐mediated activation of the lysosomal arginine sensor SLC38A9
FEBS Letters, EarlyView.Cells monitor nutrient levels via the lysosomal transporter SLC38A9 to activate the mechanistic target of rapamycin complex 1 (mTORC1). This study reveals that SLC38A9 function is regulated by pH. We identified histidine 544 as a critical pH sensor that undergoes conformational changes to control amino acid efflux from lysosomes; therefore, it ...
Xuelang Mu, Ampon Sae Her, Tamir Gonen
wiley +1 more source
Sistema de numeración Inka en la Yupana y el Khipu
Revista Latinoamericana de Etnomatemática, 2015 As cultures grow they must count and calculate, in turn creating their own systems of numeration and ways of representing numbers; it was not different in the case of Inka culture.
Milton Rojas-Gamarra, Marina Stepanova
doaj
The Table of Chords and Greek Trigonometry
Conservation Science in Cultural Heritage, 2010 Trigonometry was born due to the need of ancient astronomy to calculate and to predict the movement of the heavenly bodies. However it is hard to know who the founder of this mathematical branch was: it is likely that its origins date back to Hipparchus ...
Stefano Buscherini, Antonio Panaino
doaj +1 more source
FEBS Letters, EarlyView.Ascidian Ciona larvae initially show strong clockwise tail twisting, which is largely corrected during development. However, a small residual twist remains. This study shows that organized helical myofibrils in tail muscles mechanically stabilize this residual asymmetry, preventing complete restoration of bilateral symmetry and revealing how embryos ...
Yuki S. Kogure +3 more
wiley +1 more source
FEBS Letters, EarlyView.Septin 9 polybasic domains couple phosphoinositide‐rich membrane binding to centrosome positioning, Golgi organization, and microtubule acetylation to control epithelial polarity. Their loss disrupts this axis, causing centrosome mispositioning, Golgi fragmentation, reduced microtubule acetylation, and polarity inversion via upregulation of the ...
Ting ting Cai +4 more
wiley +1 more source
FEBS Letters, EarlyView.We present robust protocols for the preparation of supported lipid bilayers (SLBs) incorporating either Salmonella smooth LPS or outer membrane vesicles (OMVs). We use a combination of quartz crystal microbalance with dissipation (QCM‐D) and fluorescence microscopy to both characterize the SLBs of various compositions and to probe their interactions ...
Hudson P. Pace +6 more
wiley +1 more source
Estudo comparativo de vários marcadores biológicos na infecção HIV1.
Acta Médica Portuguesa, 1993 A study was performed on 51 human immunodeficiency virus (HIV 1)-infected patients with a previous history of drug abuse. By the CDC staging system for HIV infection they were mainly in advanced stages of that infection, 67% were in IV-A and 8% in IV-C1.
J E Serra +4 more
doaj +1 more source