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排序方式: 共有249条查询结果,搜索用时 31 毫秒
91.
Wei Wang Yasuyuki Matsushita Dan Aoki Kazuhiko Fukushima Rie Tomioka Kazuya Iizuka Chisato Takenaka 《Journal of Wood Science》2017,63(4):388-395
To investigate the possibility of decontaminating 137Cs-contaminated Cryptomeria japonica wood, kraft pulping was conducted and the Cs behavior in the reaction process was examined. 133Cs-treated or 137Cs-contaminated bark, sapwood, and heartwood chips of Cryptomeria japonica were digested using an aqueous solution of NaOH and Na2S. The pulp was washed with ultrapure water and filtered, after which the filtrate (black liquor) was collected. The black liquor was acidified to separate the supernatant and precipitation. The Cs (133Cs and 137Cs) concentrations in the chip and reaction products were measured. As for wood samples, the majority of Cs was present in black liquor, while only a minor amount of Cs was retained in the pulp (<1%). In the case of bark, although the majority of Cs was present in the black liquor, the proportion of Cs in the pulp was much higher than that in the wood pulp. In addition, the Cs in the precipitation of the bark was higher than that in the wood, possibly because the Cs in the bark was combined with some components, which is insoluble in alkaline solution. Our results suggest that 137Cs-contaminated Cryptomeria japonica wood can be used in the pulp and paper industries. 相似文献
92.
Kazuya Minato Yuji Konaka Iris Bremaud Shiro Suzuki Eiichi Obataya 《Journal of Wood Science》2010,56(1):41-46
The potential of muirapiranga (Brosimun sp.) as a substitute material for violin bows was estimated in terms of vibrational properties, and the influence of extractives
on the vibrational properties was examined. The loss tangent of muirapiranga was somewhat higher and the specific dynamic
Young’s modulus was rather lower than the respective values for pernambuco, which is regarded as the best material for violin
bows. Therefore, muirapiranga is a poorer bow material in terms of vibrational properties. Impregnation of crude extractives
from muirapiranga decreased the loss tangent of other wood specimens. The main compounds of the extractives were identified
as xanthyletin and luvangetin. Impregnations of isolated xanthyletin and commercially available methoxsalen, which was tested
as an analogue of luvangetin, markedly decreased the loss tangent of other wood specimens. Methoxsalen and xanthyletin differ
from conventional loss tangent-decreasing substances, namely protosappanin B and hematoxylin, in terms of water insolubility
and the absence of hydroxyl groups. From the similarity in molecular characteristics of loss tangent-decreasing substances
found so far, restriction of molecular motion due to an impregnated substance in the wood matrix is suggested as one loss
tangent-decreasing mechanism. 相似文献
93.
Takano K Watanabe-Takano H Suetsugu S Kurita S Tsujita K Kimura S Karatsu T Takenawa T Endo T 《Science (New York, N.Y.)》2010,330(6010):1536-1540
Insulin-like growth factor 1 (IGF-1) induces skeletal muscle maturation and enlargement (hypertrophy). These responses require protein synthesis and myofibril formation (myofibrillogenesis). However, the signaling mechanisms of myofibrillogenesis remain obscure. We found that IGF-1-induced phosphatidylinositol 3-kinase-Akt signaling formed a complex of nebulin and N-WASP at the Z bands of myofibrils by interfering with glycogen synthase kinase-3β in mice. Although N-WASP is known to be an activator of the Arp2/3 complex to form branched actin filaments, the nebulin-N-WASP complex caused actin nucleation for unbranched actin filament formation from the Z bands without the Arp2/3 complex. Furthermore, N-WASP was required for IGF-1-induced muscle hypertrophy. These findings present the mechanisms of IGF-1-induced actin filament formation in myofibrillogenesis required for muscle maturation and hypertrophy and a mechanism of actin nucleation. 相似文献
94.
Yusuke Kuroda Yumiko Hoshikawa Kota Irie Masayuki Kimura Kazuya Takeuchi Satoshi Furukawa 《Journal of toxicologic pathology》2022,35(1):95
Although spontaneous development of seminoma is rare in medaka, we encountered spontaneous testicular tumors located within the abdominal cavity in two adult medakas. The growth patterns of the tumors were a combination of solid and cord arrangements in one of the two cases (Case I) and lobular in the other case (Case II). The tumor cells resembled the cells at different stages of spermatogenesis, and a small number of oocyte-like cells were also scattered within the tumor. The tumor with solid and cord patterns showed loss of normal testicular architecture, and the tumor cells had partly invaded the dorsal muscular tissue and metastasized to the liver, kidney, and eye. The tumor with a lobular pattern did not exhibit local invasion or metastasis. The tumors were diagnosed as seminomas based on their histopathological characteristics, and the tumor in Case I was observed to be more malignant than that in Case II. 相似文献
95.
Yuto SANO Kazuya MATSUDA Minoru OKAMOTO Kazushige TAKEHANA Kazuko HIRAYAMA Hiroyuki TANIYAMA 《The Journal of veterinary medical science / the Japanese Society of Veterinary Science》2016,78(2):287-291
Antigen-presenting cells (APCs) in the uveal tract participate in ocular immunity including immune
homeostasis and the pathogenesis of uveitis. In horses, although uveitis is the most common ocular disorder,
little is known about ocular immunity, such as the distribution of APCs. In this study, we investigated the
distribution of CD163-positive and MHC II-positive cells in the normal equine uveal tract using an
immunofluorescence technique. Eleven eyes from 10 Thoroughbred horses aged 1 to 24 years old were used.
Indirect immunofluorescence was performed using the primary antibodies CD163, MHC class II (MHC II) and CD20.
To demonstrate the site of their greatest distribution, positive cells were manually counted in 3 different
parts of the uveal tract (ciliary body, iris and choroid), and their average number was assessed by
statistical analysis. The distribution of pleomorphic CD163- and MHC II-expressed cells was detected
throughout the equine uveal tract, but no CD20-expressed cells were detected. The statistical analysis
demonstrated the distribution of CD163- and MHC II-positive cells focusing on the ciliary body. These results
demonstrated that the ciliary body is the largest site of their distribution in the normal equine uveal tract,
and the ciliary body is considered to play important roles in uveal and/or ocular immune homeostasis. The data
provided in this study will help further understanding of equine ocular immunity in the normal state and might
be beneficial for understanding of mechanisms of ocular disorders, such as equine uveitis. 相似文献
96.
97.
Kojima K Okamoto Y Kojima K Miyatake K Fujise H Shigemasa Y Minami S 《The Journal of veterinary medical science / the Japanese Society of Veterinary Science》2004,66(12):1595-1598
Collagen synthesis was evaluated by measuring prolyl hydroxylase (PHL) activity induced within rat granulation tissue by a polyester non-woven fabric (NWF, 1 x 1 cm, 0.6 mm in thickness) impregnated with a chitin or chitosan suspension ranging in concentration from 0.1 to 10 mg/ml. In addition, PHL activity induced in rat granulation tissue by a NWF impregnated with a phosphate buffer solution was examined as a control. The PHL activity in each group remained low until 4 days post-implantation (Day 4). However, in the 10 mg chitin group, the PHL activity increased rapidly without scatter of the data at Day 7 and remained at a plateau until Day 14. In other groups, PHL activity increased linearly until Day 14. The data varied widely at Day 7. Compared to chitosan, chitin at the higher concentration was found to induce stable collagen synthesis in the early wound healing process. 相似文献
98.
Ikeda Y Miyazawa T Nishimura Y Nakamura K Tohya Y Mikami T 《The Journal of veterinary medical science / the Japanese Society of Veterinary Science》2004,66(3):287-289
To know the genetic changes of feline immunodeficiency virus (FIV) in long-term infection in cats, we inoculated three specific pathogen-free cats with FIV isolates and determined a partial env sequence covering the V3-V5 region. In 2 cats infected with subtype B strains TM1 and TM2, only one amino acid change in region V3 was observed at 9 years post infection (y.p.i.), and no nucleotide substitutions were observed between 9 and 10 y.p.i., indicating that these strains are genetically stable. On the other hand, in a cat infected with subtype A strain Petaluma at 8.7 y.p.i., 3 nucleotide insertions (one amino acid insertion) in region V5, and 1 synonymous nucleotide substitution and 2 non-synonymous nucleotide substitutions in region V5, were observed. 相似文献
99.
Matsuda K Kobayashi S Yamashita M Hirayama K Kadosawa T Taniyama H 《The Journal of veterinary medical science / the Japanese Society of Veterinary Science》2008,70(5):479-481
Sarcomatous proliferation of spindle cells was present in the mammary gland and many metastatic sites in a 10-year-old female domestic cat with tubulopapillary carcinoma in the mammary gland. Transition from neoplastic tubular structures to spindle cells in the primary site and fascicular proliferation of the spindle cells with or without coexistance of tubulopapillary carcinoma in the primary and metastatic sites were observed. Most of spindle cells were positive for cytokeratin CAM5.2 as well as the normal luminal epithelium but not the myoepithelium. From these results, this case was diagnosed as tubulopapillary carcinoma with spindle cell metaplasia and it was clarified that neoplastic luminal epithelial cells can transform to sarcomatous appearence. 相似文献
100.
Hirotaka Kondo Kazuya Hara Akihiro Sukegawa Hisashi Shibuya 《Journal of Exotic Pet Medicine》2018,27(4):1-4
A 6-year-old female degu (Octodon degus) in good body condition was presented with a mass at the base of the tail. Following presentation and the owners’ approval, the tail of the degu was surgically amputated. The mass was submitted for pathological evaluation following the surgical procedure. Histologically, the mass was comprised of lobules and sheets of polygonal cells displaying moderate amounts of basophilic foamy cytoplasm (physaliferous cells). The pathological results of the tail mass were consistent with chordoma. Approximately 3 months following the tail amputation the patient died. 相似文献