Mineyuki Yokoyama

Shiseido Group (Japan)

Author Statistics

Papers

Citation

H-Index

i-10 index

Research Field

Development of Phaseolus vulgaris L. tolerant to bean golden mosaic virus

Annual Report of the Bean Improvement Cooperative. Bean Improvement Cooperative (1991)

Josías C. Faria M.J.O Zimmermann Mineyuki Yokoyama

Source

Cite

Citations (2)

Differences in Glucosylation of Exogenous Hydroquinone by Two Morphologically Different Lines of Catharanthus roseus Cells.

Plant tissue culture letters (1994)

Shinji Inomata Mineyuki Yokoyama Youji Wachi

Marked differences were found in the glucosylation of exogenous hydroquinone to arbutin by two mor-phologically different lines (CrA and CrB) of suspension-cultured Catharanthus roseus cells of the same origin. Cells of CrA were nearly spherical in shape, dense and smaller than those of CrB, while cells of CrB were cylindrical in shape with well developed vacuoles. Arbutin productivity in CrB was remarkably larger than that in CrA at every stage of growth. After hydroquinone addition, hydroquinone glucosyltransferase was induced within 6 hours and the activity reached a peak within 24 hours in both strains. However, the maximum activity in CrB was 5-fold higher than that in CrA, and this value corresponded with that of the arbutin yield. Arbutin accumulation per cell fresh weight was also 2.6-fold higher with CrB than CrA. These substantial differences in the glucosylation of hydroquinone to arbutin in the two cell lines indicate that selection of a superior cell strain is important for efficient production of compounds by biotransformation with plant cells.

Arbutin

Hydroquinone

Catharanthus roseus

Biotransformation

Plant cell

10.5511/plantbiotechnology1984.11.211

Cite

Citations (3)

Immunological and Behavioral Effects of Fragrance in Mice

International Journal of Neuroscience (1991)

Hideki Shibata Ryoichi Fujiwara Mitsunori Iwamoto Harue Matsuoka Mineyuki Yokoyama

The aim of this study was to determine the effects of olfactory stimulation on immunological and behavioral states in mice. Anti-SRBC (IgM) plaque forming cell (PFC) count and spontaneous running activity (SRA) were measured to demonstrate the effects of exposure to a given fragrance. The decreased PFC count and thymic involution induced by high pressure stress in mice were recovered after exposing the stressed mice to the fragrance continuously for 4 days after the stress was given. The PFC and SRA also appeared to be maintained at normal levels by oflactory stimulation with the fragrance for 24 hrs after the given stress. The immunological suppression induced by high pressure stress was considered to be caused by the induction and activation of suppressor cells. However, exposure to the fragrance after the stress did not enhance suppressor activity. The restoration of the stress-induced immune suppression by olfactory stimulation was blocked by procain administration onto the olfactory cells.

Thymic involution

Involution (esoterism)

Ratón

10.3109/00207459109150355

Cite

Citations (28)

Sampling methods and population fluctuations of Empoasca kraemeri Ross & Moore, 1957 (Homoptera: Cicadellidae), Cerotoma arcuata (Olivier, 1791) and Diabrotica speciosa (Germar, 1824) (Coleoptera: Chrysomelidae) in beans, in Goiás.

Anais da Sociedade Entomológica do Brasil (1988)

Bonifácio Magalhães Mineyuki Yokoyama F. J. P. Zimmermann

Source

Cite

Citations (1)

A New 9-Lipoxygenase cDNA from Developing Rice Seeds

Plant and Cell Physiology (2003)

Kouichi Mizuno Toshii Iida Atsushi Takano Mineyuki Yokoyama Tatsuhito Fujimura

We isolated a novel C9 position specific lipoxygenase (r9-LOX1) cDNA from developing rice seeds. The enzymatic features of r9-LOX1 resembled those of rice LOX-L3 known to be contained in rice germ and to have C9-specific LOX activity. However, the expression level of the r9-LOX1 gene was higher in imbibed seeds rather than developing seeds. A homology search against the rice nucleotide database revealed the r9-LOX1 gene to be on rice chromosome 3 (accession number AC093017). The restriction enzyme map of the reported genomic sequence agreed with the result of the Southern blot analysis for the r9-LOX1. The enzyme could be useful for in vitro synthesis of 9,10-ketol-octadecadienoic acid.

10.1093/pcp/pcg142

Cite

Citations (36)

9,10-KETOL OCTADECADIENOIC ACID (KODA) LEVELS AND FLOWER BUD FORMATION IN APPLES

Acta Horticulturae (2010)

M. Kittikorn K. Okawa Hitoshi Ohara Mineyuki Yokoyama Ohji Ifuku

10.17660/actahortic.2010.884.14

Cite

Citations (1)

Industrial Application of Biotransformations Using Plant Cell Cultures

CRC Press eBooks (2020)

Mineyuki Yokoyama

This chapter emphasizes the characteristics of plant cell-mediated biotransformations and describes the possible techniques of yield improvement for industrial relevant processes. Glucose conjugations of exogenously added substances are considered to be detoxification reactions. Glucosylation and hydroxylation seem to be specific biotransformation reactions of higher plant cells. The enzymes for glucose conjugation or hydroxylation are not constitutive and can be inducible in some cases. Glucosyl conjugation, including glucosylation, glucosyl esterification, and hydroxylation are the most effective reactions among various biotransformations by plant cell cultures. The capability for biotransformations is diverse among plant species. Different biotransformations can be found among strains of the same species in culture. Plant cell cultures convert various substrates into diverse products with unique reactions, including regio- and stereospecific biotransformations. Culture media for plant tissue culture is relatively inexpensive compared with the culture of microorganisms or animal cells. Power consumption is not a significant barrier to biotransformation processes.

10.1201/9780138743208-4

Cite

Citations (1)

Effect of 9-Hydroxy-10-oxo-12(Z), 15(Z)-octadecadienoic Acid (KODA) on Endodormancy Breaking in Flower Buds of Japanese Pear

HortScience (2010)

Daisuke Sakamoto Yuri Nakamura Hiroyoshi Sugiura Toshihiko Sugiura Toshikazu Asakura

The effect of 9-hydroxy-10-oxo-12(Z), 15(Z)-octadecadienoic acid (KODA) on endodormancy breaking was studied in flower buds of japanese pear ( Pyrus pyrifolia Nakai). The optimal concentration of KODA (100 μM) for endodormancy breaking was established over a 2-year period during the endodormancy stage of 2006 and 2007 in japanese pear cultivars Kosui, Natsushizuku, and Hosui. The effect of KODA on endodormancy breaking in flower buds was similar between ‘Natsushizuku’ and ‘Kosui’ but somewhat lower in ‘Hosui’. These results indicate that KODA can be an effective agent for promoting endodormancy breaking of flower buds in ‘Natsushizuku’ and ‘Kosui’. Although not as effective as hydrogen cyanamide, KODA may be preferable at late endodormancy stages because it has no apparent phytotoxicity.

Cyanamide

10.21273/hortsci.45.10.1470

Cite

Citations (21)

[Analysis of Australia (AU) antigen and antibody in the sera of patients with chronic renal insufficiency under hemodialysis for extended periods].

PubMed (1971)

E Yamate Kazuyuki Doi T Tsuchiya Mineyuki Yokoyama

Chronic renal insufficiency

Chronic renal failure

Source

Cite

Citations (0)

Characteristics of the systemic activation of the growth by 9,10-ketol-12(Z),15(Z)-octadecadienoic acid (KODA) in Populus alba cultured in vitro

Plant Biotechnology (2024)

Mineyuki Yokoyama Rumi Kaida Kensuke Miyamoto Yuichi Tada Yoshiharu Fujii

α-Ketol octadecadienoic acid (KODA), an oxylipin, is generated from linolenic acid by 9-specific lipoxygenase, while jasmonic acid is ultimately synthesized from the same linolenic acid by 13-specific lipoxygenase. KODA has a unique action different from jasmonic acid, such as promotion of flower formation, activation of rooting, increase of shoot germinating in spring, and breaking endodormancy. We report here that KODA promotes the systemic growth in juvenile Populus alba cultured in vitro probably through the activation of immature tissue.

INT

10.5511/plantbiotechnology.24.0721b

Cite

Citations (0)