Results 231 to 240 of about 170,681 (274)

Direct induction of dictyostelium prestalk gene expression by DIF provides evidence that DIF is a morphogen

Cell, 1987
We have isolated a gene that is very rapidly induced at the transcriptional level by DIF--a low molecular weight, diffusible factor necessary for stalk cell differentiation in Dictyostelium cells developing in vitro. The gene encodes a protein containing an N-terminal signal peptide preceding approximately 70 tandem repeats of a highly conserved 24 ...
J G, Williams, A, Ceccarelli, S, McRobbie, H, Mahbubani, R R, Kay, A, Early, M, Berks, K A, Jermyn   +7 more
openaire   +2 more sources

Simultaneous DIF Amplification and Cancellation: Shealy‐Stout's Test for DIF

Journal of Educational Measurement, 1993
The present study investigates the phenomena of simultaneous DIF amplification and cancellation and SIBTEST's role in detecting such. A variety of simulated test data were generated for this purpose. In addition, real test data from various sources were analyzed.
openaire   +1 more source

Interactive DIF detection by HLM : does interacted DIF matter?

2018
Title from PDF of title page (University of Missouri--Columbia, viewed on March 10, 2010). ; The entire thesis text is included in the research.pdf file; the official abstract appears in the short.pdf file; a non-technical public abstract appears in the public.pdf file. ; Thesis advisor: Dr. Steve Osterlind. ; M.A. University of Missouri--Columbia 2009.
openaire   +2 more sources

Using Hierarchical Logistic Regression to Study DIF and DIF Variance in Multilevel Data

Journal of Educational Measurement, 2018
AbstractWhen contextual features of test‐taking environments differentially affect item responding for different test takers and these features vary across test administrations, they may cause differential item functioning (DIF) that varies across test administrations.
openaire   +1 more source

Temperatuursom of DIF ?

2004
Welke temperatuur is optimaal? Welk temperatuurverloop over de dag is het beste? Sommige telers gaan voor voornachtverlaging, anderen voor een temperatuurdip in de ochtend. In dit artikel enkele gezichtspunten omtrent de temperatuur vanuit de gewasfysiologie.
openaire   +1 more source

DIF Mathcad Worksheets

2013
Two Mathcad worksheets allow full mathematical follow-up of the equations given in the previous chapter. Complete calculations of the two DIF variants are given.
openaire   +1 more source

The Dif

Journal of Philosophy, 2005
Kadri Vihvelin, Terrance Tomkow
openaire   +1 more source

Dynamic increase factor (DIF) for concrete in compression and tension in FE modelling with a local concrete model

International Journal of Impact Engineering, 2022
J F Chen, Yong Lu
exaly  

Differential (DIF) Amps

2015
This chapter explains the gain and noise calculations and usage of two different types of differential amplifiers, the well-known two-op-amp version and the one based on ICs from various suppliers.
openaire   +1 more source

Dynamic increase factor(DIF) of concrete with SHPB tests: Review and systematic analysis

Journal of Building Engineering, 2023
Haotian Fan, Qingliang Yu
exaly