Allele-Specific Interactions between and Control Abscission in Flowers.

An advantage of analyzing abscission in genetically tractable model plants is the ability to make use of classic genetic tools such as suppression analysis. We have investigated the regulation of organ abscission by carrying out suppression analysis in flowers. Plants carrying mutations in the () gene, which encodes an ADP-ribosylation factor GTPase-activating protein, retain their outer floral organs after fertilization.

ASYMMETRIC LEAVES1 regulates abscission zone placement in Arabidopsis flowers.

Background: The sepals, petals and stamens of Arabidopsis flowers detach via abscission zones formed at their boundaries with the underlying receptacle. The ASYMMETRIC LEAVES1 (AS1) MYB transcription factor plays a critical role in setting boundaries between newly formed leaf primordia and the shoot meristem. By repressing expression of a set of KNOTTED1-LIKE HOMEODOMAIN (KNOX) genes from developing leaf primordia, AS1 and its partner ASYMMETRIC LEAVES2 allow the patterning and differentiation of leaves to proceed.

The role of a new noninvasive imaging technology in the diagnosis of anemia.

Traditionally, numerical data regarding the status of a patient are a combination of measurements made at the point of care (POC) and those made in the laboratory on specimens withdrawn from the patient. We report here on our experiences with a new method for a noninvasive determination of anemia, as defined by blood hemoglobin (Hb) concentration. This method is based on a novel technology, orthogonal polarization spectral imaging, which provides high quality digitized images of the microcirculation using reflected light.

Guidelines for organisation and management of external quality assessment using proficiency testing. Expert Panel on Cytometry of the International Council for Standardization in Haematology.

This document is intended to assist towards the WHO objective that external quality assessment (EQA) schemes be established at national and/or regional levels world-wide. Quality assurance is defined as all steps taken by the director of a laboratory to ensure reliability of laboratory results and to increase accuracy, reproducibility and between-laboratory comparability. This includes the use of internal quality control procedures and participation in external quality assessment.