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61.
Yoshinobu Katoh Tadao Hasegawa Takao Suzuki Taro Fujii 《Bioscience, biotechnology, and biochemistry》2013,77(8):2185-2190
During differentiation after auxin withdrawal, the change in the ethylene production of Hiproly barley callus paralleled the change in 1-aminocyclopropane-1-carboxylic acid (ACC) content. The levels of ACC and ethylene production decreased rapidly, and then increased in Hiproly barley callus.Aminooxyacetic acid (AOA) prevented the ACC and ethylene production of the callus. Moreover, aminoisobutyric acid (AIB) also inhibited the ethylene production, but did not prevent the ACC synthesis of the callus. On the other hand, methylglyoxal-bis(guanylhydrazone) (MGBG) greatly enhanced the ACC and ethylene production. Formation of adventitious roots in Hiproly barley callus was enhanced by the cultivation in the medium containing AIB or AOA. However, differentiation of the callus was strongly inhibited by MGBG.Thus, prevention of ethylene production may be significant for differentiation of Hiproly barley callus. 相似文献
62.
Teiichiro Ito Tadao Ishii Motohiro Nishio 《Bioscience, biotechnology, and biochemistry》2013,77(8):728-731
α-Methylthio-cinnamic acid and its substituted analogues (III) were synthesized from their respective β-aryl-α-thiopyruvic acids (II). In connection with the study on the tautomeric ene-thiol structure of β-aryl-α-thiopyruvic acids (II), 4-arylidenerl,3-oxathiolan-5-one (IV) were prepared from compounds II. 相似文献
63.
Setsuro Matsushita Fumio Ibuki Tomohiko Mori Tadao Hata 《Bioscience, biotechnology, and biochemistry》2013,77(5):436-446
Phosphodiesterase was solubilized from bovine milk microsomes and partially purified. The purified enzyme showed 20-fold specific activity compared with that of microsomes, and 1,500-fold with that of the original milk.The properties of the enzyme were investigated by using NpT. The pH optimum was at 9.5. The enzyme was inhibited with EDT A and reactivated with the addition of magnesium or calcium ions. This enzyme was strongly inhibited with reducing reagents. Km, value was 7.4 x 10-4 M for NpT at pH 9.5.RNA was hydrolyzed completely to 5′-mononucleotides, and this enzyme may be considered to show the exonucleolytic action for RNA. 相似文献
64.
Fumio Ibuki Tomohiko Mori Setsuro Matsushita Tadao Hata 《Bioscience, biotechnology, and biochemistry》2013,77(7):635-640
The RNase (EC 2.7.7.16) in bovine milk was partially purified from milk whey. The basic properties and the hydrolyzing specificity of this enzyme were studied. This enzyme was heat stable. When RNA was used as the substrate, the pH optimum was 7.5 and 3′- nucleotides were produced, but the extent of the hydrolysis stopped at 31 per cent and core was left. C! and U! were hydrolyzed but purine cyclic nucleotides were not. Poly U was digested to 3′-uridylic acid passing through U! but poly A was not. These properties are quite similar to pancreatic RNase. 相似文献
65.
66.
2-Acetamido-3,4-di-Oacetyl-2,6-dideoxy-6-S-acetyl-6-thio-d-glucopyranosyl chloride (III) was condensed with potassium thiolacetate, potassium ethylxanthate or thiourea to give three crystalline derivatives of 2-acetamido-2-deoxy-1,6-dithio-d-glucose. An attempt to prepare 2-acetamido-1,2,6-trideoxy-1,6-dimercapto-D-glucose (VII) from 2-acetamido-3,4-di-O-acetyl-1,2,6-trideoxy-1,6-di-S-acetyl-1,6-dithio-β-d-glucopyranose was described. 2-Acetamido-3,4-di-O-acetyl-1,2,6-trideoxy-1-mercapto-6-S-acetyl-6-thio-β-d-glucopyranose (VIII) was synthesized from the condensation product of III with thiourea. 相似文献
67.
Tadao Kurata Hideo Wakabayashi Yosito Sakurai 《Bioscience, biotechnology, and biochemistry》2013,77(1):101-105
In the presence of oxygen, L-ascorbic acid sol ution (0.05 M) browned more intense1 y than dehydro-L-ascorbic acid solution (0.05 M) during storage for longer period.The mixed solution of L-ascorbic acid (ASA) and dehydro-L-ascorbic acid (DHA) with the ratio of 1:1 or 1:3 in concentration gave more intense browning than DHA solution during storage at 38°C for about 3 weeks. Essentially the same type of browning was observed in case of the mixture of ASA and DHA with D-glucose. Browning of partially oxidized ASA solution also showed substantially the same results as those mentioned above. 相似文献
68.
69.
Masao Fujimaki Nguyen Van Chuyen Tadao Kurata 《Bioscience, biotechnology, and biochemistry》2013,77(13):2043-2049
Decarboxylation of about twenty kinds of α, β and γ-amino acids in the reaction with glyoxal or ninhydrin was investigated. The decarboxylation rate of amino acids proved that steric and polar effects had important roles in the reaction.From the data of pK2 values and decarboxylation rates of amino acids, it can be concluded that under a similar steric environment, the decarboxylation rate depends on the anion concentration of amino acids.Besides carbon dioxide, acetaldehyde, 2-propanone and propionaldehyde were respectively detected from the reaction of β-alanine, β and γ-amino-n-butyric acids with glyoxal or ninhydrin. The decarboxylation mechanism of these amino acids seemed to take place through the corresponding β- or γ-keto acid.Oxygen absorption was also observed from the reaction of amino acids with dicarbonyl compounds. 相似文献
70.