Studies on the Influences of high Hydrostatic Pressure upon Yeasts

Following results were obtained with yeasts cultivated in malt-juice. (1) By examining the multiplication of yeasts by use of micetocrite method, and their fermentation action by Lane's method, it is stated that both processes are prohibited by high pressure, but after release from the compression they become equal to the control gradually, (2) Morphological changes of yeasts are not observed. (3) The vitality of yeasts is not influenced by hydrostatic pressure up to 1600 kg/c㎡

On the Influences of high Hydrostatic Pressure upon Bacteria

With B. pyocyaneus following results were obtained. (1) When bacteria are exposed to moderate high pressure (800kg/c㎡, 30 min.), the lag phase of their reproduction is prolonged and their respiration inhibited. (2) At higher pressure up to 1600kg/c㎡, the respiration of bacteria stops and their other functions decline

Effects of High Hydrostatic Pressure on the Cardiac Muscle Part II. On the Refractory Period

Experiments were performed to examine the action of high hydrostatic pressure on the isolated frog heart ventricle. The refractory period of the heart muscle prolonged by about 20 per cent. It seems also that cardiac ventricle under high pressure responds either all or none to electrical stimulus

Studies on the Effects of high Hydrostatic Pressure upon Fertilized Frog Eggs

Following results were obtained with fertilized frog eggs. (1) The cleavage delays at 500 kg/c㎡ and stops at higher pressure than 1000 atm. (2) The cleavage furrow becomes irregular and deep at 300500 kg/c㎡. (3) Abnormal tadpole often developes from compressed fertilized eggs. (4) It is supposed that jelly layer of frog eggs is also affected by high pressure

Effects of High Hydrostatic Pressure on the Cardiac Muscle Part III. On the Excitability of Muscle

When high hydrostatic pressure was applied to isolated ventricle muscle, the results were obtained as follows: (1) The excitability of cardiac muscle augments by the pressure from 50 to 200 atm. (2) The response to electric stimuli disappears at high pressure (400 atm. or more). (3) It is interesting that the excitability of ventricle muscle rises transiently upon release from high pressure

Effects of High Hydrostatic Pressure on the Cardiac Muscle Part I. On the Isolated Frog Heart

When high hydrostatic pressure was applied to isolated frog heart, following changes were observed on the cardiac action: 1) At relatively low pressure, heart rate increased, but at moderate high pressure, it decreased. 2) There occurred no change of conduction time, namely P-Q interval. 3) Upon appling pressure, the amplitude of action potential of ventricle muscle, i.e. the height of R wave augumented

On the Effects of high Hydrostatic Pressure Upon Frog Sperms

To frog sperms high hydrostatic pressure up to 1500kg/c㎡ was applied, and following changes were observed. (1) The motility of sperms does not change at under 1000 kg/c㎡ pressure, but at higher pressure they become inactive or immotile. (2) At certain high pressure some sperms have their motility but lose fertility. (3) Frog eggs are affected by high pressure more sensitively than sperms

Fffect of High Hydrostatic Pressure on Cell Division

In order to study the influence of pressure effects on the cell division of sea urchin eggs we have performed a series of experiments to enable us to understand the meaning and the importance of morphogenesis of the embryo. Sea urchin eggs used are of Temnopleurus tereumatics, in the stages of unfertilization to early blastulae. The experimental results can be summarized as follows. 1) In unfertilized eggs the elevation of fertilization membrane is delayed by high pressure of 300 kg/㎠ applied for 15 minutes. The delay is in proportion to the pressure intensity and duration. Neverthless, furrowing process of the egg does proceed after the pressure is withdrawn. 2) Likewise, in fertilized eggs, the furrowing are retarded under high pressure, in fertilized eggs, the furrowing are retarded under high pressure, in proportion to the pressure intensity and duoration. In most cases, however, the rate of the cell division catches up with that of the control before reaching the stages of bastulae. 3) The deformities of pluteus can be observed in applying the pressure neither to unfertilized, nor to fertilized eggs in all stages

ワイヤーソー切削条件がシリコンウエハWarp量に及ぼす影響

金沢大学理工研究域機械工学系近年、コストを抑えてより大量のデバイスチップを製造するために、基盤となるシリコンウエハは300mm、400mmと大口径化が進められている．現在主流となりつつあるワイヤーソー装置はウエハ一枚一枚の生産管理が困難である．そのためウエハ加工精度を落とさずにインゴットを切削する最適な条件の見極めが重要となる．報告者らは2002年度秋季大会にて既にシリコンウエハのWarp量と形状についてその発生メカニズムを明らかにした．本研究では引き続き切削の際ワイヤーとインゴットとの間で発生する熱に着目し、切削条件を様々に変化させWarp量低減を試みた.出版者照会後に全文公