Through a biochemical and a genetic approach, we have identified several plant genes encoding methylthioribose (MTR) kinase, an enzyme involved in recycling of methionine through the methylthioadenosine (MTA) cycle. OsMTK1, an MTR kinase from rice (Oryza sativa), is 48.6 kD in size and shows cooperative kinetics with a V(max) of 4.9 pmol/min and a K0.5 of 16.8 microm. MTR kinase genes are the f...

We present an optimization framework for graph-regularized multi-task SVMs based on the primal formulation of the problem. Previous approaches employ a so-called multi-task kernel (MTK) and thus are inapplicable when the numbers of training examples n is large (typically n < 20, 000, even for just a few tasks). In this paper, we present a primal optimization criterion, allowing for general loss...

The 5-methylthioadenosine (MTA) or Yang cycle is a set of reactions that recycle MTA to Met. In plants, MTA is a byproduct of polyamine, ethylene, and nicotianamine biosynthesis. Vascular transcriptome analyses revealed phloem-specific expression of the Yang cycle gene 5-METHYLTHIORIBOSE KINASE1 (MTK1) in Plantago major and Arabidopsis thaliana. As Arabidopsis has only a single MTK gene, we hyp...

Bu araştırmada, Madde Tepki Kuramı’na (MTK) dayalı gerçek puan eşitlemede, ölçek dönüştürme yöntemlerinin (ortalama-ortalama (OO), ortalama-standart sapma (OS), Stocking-Lord (SL), Haebara (HB)) farklı koşullar altında eşitleme hatalarının karşılaştırılması amaçlanmıştır. Araştırmanın amacı doğrultusunda, yöntemlerin hatalarını karşılaştırmak için örneklem büyüklüğü (500, 1000, 3000, 10000), te...