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1.
A respiration-deficient (RD) mutant was isolated from the petite-negative, salt-tolerant yeast Zygosaccharomyces rouxii. One strain among sixteen glycerol-non-utilizing mutants exhibited vigorous liberation of CO2 but no uptake of O2. Furthermore, this strain lacked cytochrome aa3 and had a reduced level of cytochrome b. The few mitochondria found in cells of this strain contained few or no cristae. Salt tolerance and intracellular accumulation of glycerol by the RD strain were almost equal to that of the wild-type strain in media containing NaCl up to 2.5 M. In media with more than 3 M NaCl, the growth of the RD mutant was retarded and the intracellular accumulation of glycerol was depressed in spite of ample production. 相似文献
2.
This study aimed to describe the change in the number of successful nests of the white-tailed eagle, Haliaeetus albicilla, for 25 years (1997–2021) along the Teshio River (100 km), Japan, which is a new habitat for this endangered species and identify factors driving the number of nests. The number of nests grew from two to nine. The logistic function fitted in well with the growth, and the capacity of the study area sustaining the successful nests was estimated at 6.5. The precipitation in January and April explained the deviation of the observed values from the model prediction. In particular, heavy rain in April was associated with low numbers. Forty-six nest remains were collected from 17 nest locations. Twelve genera of birds, six genera of mammals, and four genera of fishes were identified. Fish and bird items occupied 93.6% of prey individuals. The fish proportion was similar between high-performance years when the observed number of successful nests was higher than the model prediction and low-performance years with a lower number than the prediction (55.2% and 51.0%). However, it was higher in the nests with two fledglings (63.0%) than those with a single fledgling (41.5%). The nearest neighbor distance (NND) of the successful nests declined with the increase in the number of nests. Based on territory size (the mean NND = 7.8 km), the study area can hold 13 nests. The process and mechanism of the dynamics of the number of nests were discussed, focusing on territoriality and weather effects. 相似文献
3.
Yukio Kitade Naohiro Saito Atushi Kozaki Kazumasa Takahashi Chizuko Yatome Yoshifumi Takeda 《Nucleosides, nucleotides & nucleic acids》2013,32(1-3):91-97
Abstract Reaction of 9-(2,3,5-tri-O-acetyl-β-D-ribofuranosyl)-7-methylguaninium iodide (2a) with hydrogen peroxide in acetic acid gave the corresponding 7-methyl-8-oxoguanosine derivative (3a) in good yield. Deprotection of 3a easily gave 7-methyl-8-oxoguanosine (1), which is well-known as an immunomodulator. Substitution of acetyl group at the N-position of guanine ring accelerated the oxidation reaction of the 7-methylguaninium iodide. 相似文献
4.
Atushi Kato Hiroo Ueda Yohei Hashimoto 《Bioscience, biotechnology, and biochemistry》2013,77(1):28-31
(–)-Menthyl carbinol (1-(R)-methyl-3-(R)-hydroxymethyl-4-(S)-isopropylcyclohexane) (4) was prepared stereospecifically in good yield by treatment of formaldehyde with the Grignard reagent from (–)-menthyl chloride (2), which was prepared from (–)-menthol-(1-(R)-methyl-3-(R)-hydroxy-4-(S)-isopropylcyclohexane) (1) by chlorination using the Lucas reagent (HCl+ZnCl2). The configuration of 4 was assigned by the chemical method. 相似文献
5.
Takahiro Kuragano Kenichiro Kitamura Osamu Matsumura Akihiko Matsuda Taiga Hara Hideyasu Kiyomoto Toshiaki Murata Shouichi Fujimoto Hiroki Hase Nobuhiko Joki Atushi Fukatsu Toru Inoue Yukihiro Itakura Takeshi Nakanishi 《PloS one》2016,11(3)
Objective
It has been reported that hyporesponsiveness to erythropoiesis-stimulating agent (ESA) is associated with adverse events in patients on maintenance hemodialysis (MHD). However, it has not been determined whether higher iron storage is associated with an improved response, including better survival, to ESA.Design and Method
We measured serum ferritin, hemoglobin (Hb), and transferrin saturation (TSAT) levels every three months for two years in 1,095 MHD patients. The weekly dose of ESA to Hb ratio was also calculated as an index of ESA responsiveness (ERI).Results
A significant correlation (p<0.001, R = 0.89) between ferritin and Hb was only observed in the patients with ferritin levels <50 ng/mL. High-dose (≥50 mg/week) intravenous iron administration, female sex, low serum albumin, and angiotensin-converting enzyme inhibitor/angiotensin receptor blocker use were significant predictors of a high ERI value (>280); however, serum ferritin and TSAT levels did not predict a higher ERI. In the time-dependent Cox hazard model, the risk for a composite event in the patients with a high ERI (≥280) and a high ferritin level (≥100 ng/mL) was significantly greater (hazard ratio [HR], 2.09, P = 0.033) than that for patients with a high ERI and a low ferritin (<100 ng/mL) level.Conclusion
Hb was dependent upon ferritin levels in patients with ferritin levels <50 ng/mL but not in patients with ferritin levels ≥50 ng/mL. Patients with hyporesponsiveness to ESA had a greater risk of composite events, but ERI was unrelated to iron storage. 相似文献6.
Characterization of Japanese flounder karyotype by chromosome bandings and fluorescence in situ hybridization with DNA markers 总被引:4,自引:0,他引:4
The chromosomes of Japanese flounder, Paralichthys olivaceus, were examined by conventional differential staining methods including G-, Q-, C-, silver (Ag)-, fluorochrome, and replication
R-bandings and by fluorescence in situ hybridization (FISH) with 5S and 18S rDNAs and telomeric DNA as probes. Replication
R-banding substantially made it possible to identify 24 homologous pairs by their RBG-banding pattern and relative length.
Both rDNA loci were mapped to chromosome 1, where 5S and 18S rDNA loci were located at the centromeric region and secondary
constriction, respectively. C-banding revealed that both rDNA loci were heterochromatic, and 18S rDNA loci were positive for
chromomycin A3 but negative for 4′,6-diamidino-2-phenylindole (DAPI) staining. Telomeric FISH signals were observed at all chromosome ends
and at the interstitial region of some chromosomes. The observed results were discussed in relation to the karyotype evolution
in the order Pleuronectiformes. 相似文献
7.
Yokono Makio Umetani Ikumi Takabayashi Atushi Akimoto Seiji Tanaka Ayumi 《Photosynthesis research》2019,139(1-3):155-161
Photosynthesis Research - Recently, we isolated a complex consisting of photosystem II (PSII) and light-harvesting complexes (LHCs) from Nannochloropsis granulata (Umetani et al. Photosynth Res... 相似文献
8.
In the present study, the effect of constituting amino acid residue numbers of oligopeptide derivatives, which are candidate materials to construct molecular recognition sites, on chiral recognition ability was investigated. Chiral recognition sites were formed from oligopeptide derivatives, of which constituting amino acid residue numbers were three to six, by adopting an alternative molecular imprinting. It was made clear that the number four, in other words, the tetrapeptide derivative, is the best candidate material to form a chiral recognition site. 相似文献
9.
Hajime Sasaki Atushi Nemoto Hisae Kume Sonoko Narisawa Naommy Takahashi 《In vitro cellular & developmental biology. Animal》1998,34(1):68-73
Summary A factor with a molecular weight of less than 1 kDa in the mucosa of the bovine small intestine (low molecular weight factor
or LMW factor) stimulated DNA synthesis in rat hepatocytes in primary culture. This factor only showed its activity when it
was added with a larger factor with a molecular weight of 30 kDa that was also found in the same tissue (high molecular weight
factor or HMW factor). The LMW factor probably acts to enhance the action of a hepatotrophic growth factor, since EGF and
HGF can substitute for the HMW factor. The action of the LMW factor was not due to the actions of low molecular weight substances
such as norepinephrine, estradiol, triiodothyronine, and putrescine, which enhance the action of EGF or HGF, since substantial
amounts of these substances were not found in the extract. When intraperitoneally administered into rats, after two-thirds
hepatectomy, the LMW factor enhanced hepatocyte proliferation without the administration of the HMW factor. In the regenerating
liver, a hepatotrophic growth factor(s), which acts synergistically with the LMW factor, might be properly provided, but the
supply of the LMW factor might be below the level that maximally stimulates hepatocyte proliferation. 相似文献
10.
Keimei Oh Tadashi Matsumoto Ayumi Yamagami Atushi Ogawa Kazuhiro Yamada Ryuichiro Suzuki Takayuki Sawada Shozo Fujioka Yuko Yoshizawa Takeshi Nakano 《PloS one》2015,10(3)
Plant hormone brassinosteroids (BRs) are a group of polyhydroxylated steroids that play critical roles in regulating broad aspects of plant growth and development. The structural diversity of BRs is generated by the action of several groups of P450s. Brassinazole is a specific inhibitor of C-22 hydroxylase (CYP90B1) in BR biosynthesis, and the application use of brassinazole has emerged as an effective way of complementing BR-deficient mutants to elucidate the functions of BRs. In this article, we report a new triazole-type BR biosynthesis inhibitor, YCZ-18. Quantitative analysis the endogenous levels of BRs in Arabidopsis indicated that YCZ-18 significantly decreased the BR contents in plant tissues. Assessment of the binding affinity of YCZ-18to purified recombinant CYP90D1 indicated that YCZ-18 induced a typical type II binding spectrum with a Kd value of approximately 0.79 μM. Analysis of the mechanisms underlying the dwarf phenotype associated with YCZ-18 treatment of Arabidopsis indicated that the chemically induced dwarf phenotype was caused by a failure of cell elongation. Moreover, dissecting the effect of YCZ-18 on the induction or down regulation of genes responsive to BRs indicated that YCZ-18 regulated the expression of genes responsible for BRs deficiency in Arabidopsis. These findings indicate that YCZ-18 is a potent BR biosynthesis inhibitor and has a new target site, C23-hydroxylation in BR biosynthesis. Application of YCZ-18 will be a good starting point for further elucidation of the detailed mechanism of BR biosynthesis and its regulation. 相似文献