Study on Genesis of Skarns and the Related Minerals

The present study is concerned with the so-called skarns designated after the rule applied to generally and the related minerals comprised in several ore deposits distributing in the Chūgoku District with respect to their geneses and in pursuit of so-called pyrometasomatic or contact effects. Inspection of the paragenetic relationships among, and identification of, the respective minerals have been fulfilled as elaborately as possible by means of an ordinary microscope and x-ray diffractometer in conjunction with heat treatments especially for some specimens, resulting in more precise interpretation other than various concepts given previously by many authors and furthermore in discovery of some rare minerals taking an important part in the subject under consideration

CELLULAR DISTRIBUTIONS OF CHLORIDE AND HYDROGEN PEROXIDE IN MESOPHYLL AND BUNDLE SHEATH CELLS OF MAIZE EXPOSED TO SALINITY STRESS

Cellular localization of chloride(Cl) and hydrogen peroxide (H2O2) in the leaf blades of maize plants exposed to 3% NaCl were investigated. This study was aimed to investigate whetherdifferential sensitivity to salinity between mesophyll cells (MC) and bundle sheath cells (BSC) in maize associated with differential accumulation of Cl and H2O2 in MC and BSC. Cl distribution was examined with X-ray microanalysis, whereas H2O2 was analyzed histochemically and cytochemically using 3,3-diamino-benzidine(DAB) and Cerium Chloride (CeCl30.The present study shows that Cl accumulation in MC and BSC of the plants treated with NaCl was relatively comparable. However, salinity-induced H2O2 formation in MC chloroplasts was higher compared with that in BSC chloroplasts. In addition, H2O2 accumulation was also detected in apoplast of MC and BSC with the greatest accumulation being detected in the cell walls of MC facing to the intercellular space. These results suggest that differential sensitivity between MC and BSC chloroplasts to salinity is not caused by differential accumulationof Cl between the cells. Apoplastic accumulation of H2O2 may rather reflect changes in oxidative balance generated by ROS scavenger in the cells that affects the homeostasis of the whole cell

Salinity Stress Alters Nutrient Uptake and Causes the Damage of Root and Leaf Anatomy in Maize

Salinity is one of major problems in agriculture especially in arid and semiarid area due to causes the damage of many aspects in plant growth and development. This study observed root and leaf anatomy and nutrient uptake in maize plants exposed to salinity stress. Maize seedlings were placed in the plantation room under same temperature, humidity and light intensity conditions and were treated with 0 %, 1 %, 2 % and 3 % NaCl for 5 d. Anatomy of root and leaf were observed using scanning electron microscopy (SEM). Nutrient uptake was estimated by the content of trace elements of leaves. Trace element were quantified using inductively coupled plasma-mass spectrometry (ICP-MS), but chlorine was determined by an atomic absorption flame spectrometer. The results showed that salinity slightly damaged roots anatomy. Epidermis cells and parenchyma cells of cortex and pith were shrinkage in 2 % and 3 % NaCl-treated plants.  Leaf anatomy showed mesophyll and bundle sheath cells which slightly suppressed. Meanwhile, chloroplasts content inside those cells were dramatically decreased. Anatomical damage of roots and leaves was accompanied by altering uptake of some trace elements. The contents of aluminum, calcium, iron, magnesium, sodium, chlorine, in NaCl-treated plants were higher than control. Otherwise, boron, potassium and phosphor were lower in NaCl-reated plants. The rest of trace elements were in comparable concentration. Keywords: maize; leaf; nutrient; root; salinity

Possible Excitonic Phase of Graphite in the Quantum Limit State

The in-plane resistivity, Hall resistivity and magnetization of graphite were investigated in pulsed magnetic fields applied along the \textit{c}-axis. The Hall resistivity approaches zero at around 53 T where the in-plane and out-of-plane resistivities steeply decrease. The differential magnetization also shows an anomaly at around this field with a similar amplitude compared to that of de Haas-van Alphen oscillations at lower fields. This transition field appears insensitive to disorder, but reduces with doping holes. These results suggest the realization of the quantum limit states above 53 T. As a plausible explanation for the observed gapped out-of-plane conduction above 53 T, the emergence of the excitonic BCS-like state in graphite is proposed.Comment: 15 pages, 6 figures, to be published in J. Phys. Soc. Jp

On Prehnite and Some Others from the Takase Mine, Okayama Prefecture

The vein-like lenticular mass composed of prehnite and some others have been found intervening within serpentinite in the Takase mine famous for production of the chromite ores on an industrial scale and studied somewhat genetically with respect to so-called "rodingite". In addition, thermal behaviors of prehnite and garnet have been pursued for inspection of their genesis or interrelations.今村外治教授退官記念特集

Enzymatic synthesis of cyclic imino acids

Optically active cyclic imino acids are widely used as important pharmaceutical intermediates and it is necessary to develop cost effective synthetic method for their production. We have already established one-pot synthesis of L-cyclic imino acids from diamino acids by using N-methyl-L-amino acid dehydrogenase (NMAADH) from Pseudomonas putida. In order to make this process more efficient, we established a recombinant Escherichia coli which expresses NMAADH, lysine racemase from P. putida and D-lysine dehydrogenase from Selenomonas ruminantium in a single cell. The recombinant E. coli makes it possible to recycle NADPH by combination of reductive reaction using NMAADH and oxidative reaction using D-lysine dehydrogenase (Fig.1). Please click Additional Files below to see the full abstract