Treatment of white wine of browning color material with nylon 66

It has been found that a parUal removal of polyphenols from a white table wine by treatment with nylon paste reduc,es color and considerably increases its resistance to browning d,uring storage.This confirms that the browning of White wines i,s due to oxidation of polyphen: olic material an:d not to me1'anoLdin formation by sugar and amino acid interation, the common cause of browning in the food industries.Brownish pink color of the ,skin of K6shu and Delaware grape berries proved that these spedes conta'ined too much polyphenol sulbstances; consequently wines of these two grapes ,get browning more quickly. Treatment of the wine with nylon paste is simple to carry out and, since nylon is chemically inert, it neither dissolves in wine nor reacts with it. Nylon removm a part of ·the phenolic material by adsorption. Nylon paste can easily be regenerated lby treating with alkali and washing with water. All experiments were made with young and aged wines, but the process could probably be ,applied with advantage at an earlier stage of vinification. Nylon treatment is complementary to the usual process of wine making and does no·t supercide sulfitin,g or fining. It was introduced in the process of wine making beoause it is very economical and useful to the preservation of materials

Effect of quantum lattice fluctuations on the optical-absorption spectra of halogen-bridged mixed-valence transition-metal complexes

The effect of quantum lattice fluctuations on the optical-absorption spectra in the ground state of halogen-bridged mixed-valence transition-metal linear-chain complexes is studied by using a one-dimensional extended Peierls-Hubbard model. The nonadiabatic effects due to finite phonon frequency $\omega_{\pi}>0$ are treated through an energy-dependent electron-phonon scattering function $\delta(k^{\prime},k)$ introduced by means of an unitary transformation. The calculated optical-absorption spectra do not have the inverse-square-root singularity, but they have a peak above the gap edge and there exists a significant tail below the peak, which are consistent with the optical-absorption coefficient or the optical conductivity measurements of this material.Comment: 10 pages, 6 figure

ホタル生物発光における発光制御機構の化学生物学的研究

Firefly bioluminescence is an enzymatic reaction, which requires Mg2+, ATP, and O2. The mechanism of this bioluminescence is as follows; first, the luciferase catalyzes the adenylylation of the luciferin and then the oxygenation of the adenylylated luciferin, which makes an excited state oxyluciferin is generated and yellow-green (560 nm) light is emitted. This high efficiency luminescent system is widely used in the field of life science. At first, I have synthesized firefly luciferin analogs and evaluated bioluminescent property of 7- substituted and π-extended analogs. The π-extended type firefly luciferin analogs emitting blue, green, and red lights were developed. The longest emission maximum was observed at 675 nm (Near infra red, NIR), which belongs to the NIR biological window (650-900 nm), useful for deep site bioimaging of living animals. Next, I and the collaborator have applied NIR luciferin analog to in vivo cancer imaging. The light intensity of NIR emission luciferin analog (λmax= 675 nm) at the living mice imaging experiment had 10 times stronger than natural luciferin. The results indicate that the NIR emission luciferin analog has great potential to detect tumors in deeper sites. But firefly bioluminescence has a problem. The stronger light is required for realization of in vivo supersensitive deep site imaging. And another multi color luciferin analog has only very low light intensity. I have to solve this problem. The solution is that the light emission of the adenylated analogs was strongly enhanced compared with those of analogs themselves. But luciferin adenylate has low stability, so luciferin adenylate was not used imaging experiment as practical use tool. we aspire to create a high intensity and high stability luminescence system: a stable luciferyl- AMP. One has luciferyl-AMP’s structure activity correlation. Many kind of luciferin nucleotide was synthesized and evaluated those light intensity. One of luciferin nucleotide analog that was translated nucleotide structure at the phosphoester bond site has high stability. High stability luciferin nucleotide analog was developed and this technology can be applied to bule and red luciferin analogs. These technology will become a new powerful luminescent tool for life science field.電気通信大学201

Calibration of the superconducting gravimeter TT70 #016 at Syowa Station by parallel observation with the absolute gravimeter FG5 #203

For the purpose ofcalibration ofthe superconducting gravimeter model TT70 #016 at Syowa Station,Antarctica,we carried out parallel observations with the absolute gravimeter FG5 #203 from December 29, 2000 to January 25, 2001. During the FG5 measurements,the laser stability was sometimes not good and this caused irregular data.We carefully examined the relation between laser stability and gravity values,and took it into account for the removal of abnormal data.We applied linear regression to the selected SG and FG /data set,and obtained the value of -58.168 μGal/V to an accuracy of 0.10% for the scale factor of TT 70 #016.The difference of the obtained scale factor from the previous value of -57.965 μGal/V is about 0.35%