The results demonstrated that supplement containing folate, vitamin B, and vitamin B in middle-aged and elderly patients with hyperhomocysteinemia could improve their cognitive function partly and reduce serum tHcy levels.

High-quality, monocrystalline 6H-SiC thin films have been epitaxially grown on 6H-SiC {0001} substrates which were prepared 3° off-axis from 〈0001〉 towards 〈112̄0〉 at 1773 K via chemical vapor deposition (CVD). Essentially, no defects were generated from the epilayer/substrate interface as determined by cross-sectional transmission electron microscopy (XTEM). Double positioning boundaries which were observed in β-SiC grown on 6H-SiC substrates were eliminated as confirmed by plan-view TEM. A strong dependence of the surface morphology of the as-grown thin films on the tilting orientation of the substrates was observed and reasons for this phenomenon are discussed. The unintentionally doped 6H-SiC thin films always exhibit n-type conduction with a carrier concentration on the order of 1016 cm−3. Au-6H-SiC Schottky barrier diodes were fabricated on the CVD 6H-SiC thin films and it was found that the leakage current at a reverse bias of 55 V was only 3.2×10−5 A/cm2. This is compared to SiC films grown on other substrates.

Deep level transient spectroscopy and resistivity measurements have been used to characterize defects in as-grown and neutron irradiated epitaxially grown 3C-SiC on Si(100) substrates. The thick epilayers were free of defects; neutron irradiation induced an electron trap with an activation energy of 0.49 eV. The SiC-Si interface has a large density of defects and dislocations. Most of the irradiation defects are confined to the lower two-thirds of the band gap. Ninety percent of these defects can be removed by annealing at 350 °C.

Keywords 13 C labelling; flower abortion; pod abortion; stomatal conductance; water stress; b-Noxalyl-L-a, b-diaminopropionic acid (b-ODAP) Correspondence AbstractGrass pea (Lathyrus sativus L.) is an indeterminate grain legume considered adapted to dry environments, but the mechanisms of its adaptation are not well understood. Grass pea plants were exposed to terminal drought from podding, and the development of water deficit was measured together with its effects on leaf photosynthesis, stomatal conductance, carbon remobilisation to the seeds, flower production and abortion, pod production and abortion, seed set, seed growth and the neurotoxin b-N-oxalyl-L-a, b-diaminopropionic acid (b-ODAP) concentration. Predawn leaf water potential (Ψ leaf ), stomatal conductance (gs), rate of leaf photosynthesis (Pn), flower production, pod production, filled pod number, seed number, seed size and yield decreased, while flower abortion, pod abortion and seed abortion increased, and the concentration of b-ODAP was unchanged under terminal drought conditions. gs and Pn began to decrease at a higher plant-available soil water content (PAWC) (67.2 AE 2.3 % and 62.9 AE 2.3 %) than Ψ leaf (43.7 AE 1.1 %). Flowers and pods ceased being produced only when the PAWC decreased below 40.1 AE 4.6 % and 35.3 AE 3.0 %, respectively, but seed set and seed growth ceased when PAWC decreased below 55.5 AE 1.6 % and 58.0 AE 3.7 %, respectively. The mobilization of 13 C labelled assimilates from the stems was greater under terminal drought than under wellwatered conditions, but the transfer to the seed was small. We conclude that seed set and seed growth decreased as the soil dried due to a reduction in current photosynthesis as a result of stomatal closure.