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排序方式: 共有197条查询结果,搜索用时 15 毫秒
21.
Corte AC Svoboda WK Navarro IT Freire RL Malanski LS Shiozawa MM Ludwig G Aguiar LM Passos FC Maron A Camargo ZP Itano EN Ono MA 《Mycopathologia》2007,164(5):225-228
The aim of this study was to evaluate the seroprevalence of Paracoccidioides brasiliensis infection in wild New World monkeys (Cebus sp. and Alouatta caraya). A total of 93 animals (Cebus sp., n = 68 and Alouatta caraya, n = 25) were captured in the Paraná River basin, Paraná State, Brazil and the serum samples were analyzed by ELISA and immunodiffusion
using P. brasiliensis gp43 and exoantigen as antigens, respectively. The seropositivity observed by ELISA was 44.1% and 60% for Cebus sp. and A. caraya, respectively, while by immunodiffusion test Cebus sp. showed positivity of 2.9% only. No significant difference was observed in relation to age and sex. This is the first
report of paracoccidioidomycosis in wild capuchin monkeys and in wild-black and golden-howler monkeys. The high positivity
to P. brasiliensis infection in both species evaluated in our study and the positivity by immunodiffusion test in Cebus sp. suggest that natural disease may be occurring in wild monkeys living in paracoccidioidomycosis endemic areas. 相似文献
22.
Across the great divide: genetic forensics reveals misidentification of endangered cutthroat trout populations 总被引:2,自引:2,他引:0
Metcalf JL Pritchard VL Silvestri SM Jenkins JB Wood JS Cowley DE Evans RP Shiozawa DK Martin AP 《Molecular ecology》2007,16(21):4445-4454
Accurate assessment of species identity is fundamental for conservation biology. Using molecular markers from the mitochondrial and nuclear genomes, we discovered that many putatively native populations of greenback cutthroat trout (Oncorhynchus clarkii stomias) comprised another subspecies of cutthroat trout, Colorado River cutthroat trout (Oncorhynchus clarkii pleuriticus). The error can be explained by the introduction of Colorado River cutthroat trout throughout the native range of greenback cutthroat trout in the late 19th and early 20th centuries by fish stocking activities. Our results suggest greenback cutthroat trout within its native range is at a higher risk of extinction than ever before despite conservation activities spanning more than two decades. 相似文献
23.
Yasuyuki Fujii Hidenori OhtakeNaoya Ono Toshifumi HaraTakanobu Sakurai Syuya TakahashiTetsuo Takayama Yoshiki FukasawaFumiyasu Shiozawa Narutoshi TsukaharaTakehiro Hirayama Yasuyuki IgarashiRyo Goitsuka 《Biochimica et Biophysica Acta (BBA)/Molecular and Cell Biology of Lipids》2012,1821(4):600-606
Sphingosine 1-phosphate (S1P) regulates lymphocyte trafficking via type-1 S1P receptor (S1P1) and participates in many pathological conditions. We developed a novel type S1P1-selective antagonist, TASP0251078, which is structurally unrelated to S1P. This competitive antagonist inhibited binding of S1P to S1P1 resulting in reduced signaling downstream of S1P1, including GTPγS-binding and cAMP formation. TASP0251078 also inhibited S1P-induced cellular responses such as chemotaxis and receptor-internalization. Furthermore, when administered in vivo, TASP0251078 induced lymphopenia in blood, which is different from previously reported effects of other S1P1-antagonists. In a mouse contact hypersensitivity model, TASP0251078 effectively suppressed ear swelling, leukocyte infiltration, and hyperplasia. These findings provide the chemical evidence that S1P1 antagonism is responsible for lymphocyte sequestration from the blood, and suggest that the effect of S1P1 agonists on lymphocyte sequestration results from their functional antagonism. 相似文献
24.
Shiozawa K Maita N Tomii K Seto A Goda N Akiyama Y Shimizu T Shirakawa M Hiroaki H 《The Journal of biological chemistry》2004,279(48):50060-50068
Peroxisomes are responsible for several pathways in primary metabolism, including beta-oxidation and lipid biosynthesis. PEX1 and PEX6 are hexameric AAA-type ATPases, both of which are indispensable in targeting over 50 peroxisomal resident proteins from the cytosol to the peroxisomes. Although the tandem AAA-ATPase domains in the central region of PEX1 and PEX6 are highly similar, the N-terminal sequences are unique. To better understand the distinct molecular function of these two proteins, we analyzed the unique N-terminal domain (NTD) of PEX1. Extensive computational analysis revealed weak similarity (<10% identity) of PEX1 NTD to the N-terminal domains of other membrane-related type II AAA-ATPases, such as VCP (p97) and NSF. We have determined the crystal structure of mouse PEX1 NTD at 2.05-A resolution, which clearly demonstrated that the domain belongs to the double-psi-barrel fold family found in the other AAA-ATPases. The N-domains of both VCP and NSF are structural neighbors of PEX1 NTD with a 2.7- and 2.1-A root mean square deviation of backbone atoms, respectively. Our findings suggest that the supradomain architecture, which is composed of a single N-terminal domain followed by tandem AAA domains, is a common feature of organellar membrane-associating AAA-ATPases. We propose that PEX1 functions as a protein unfoldase in peroxisomal biogenesis, using its N-terminal putative adaptor-binding domain. 相似文献
25.
Shiozawa K Goda N Shimizu T Mizuguchi K Kondo N Shimozawa N Shirakawa M Hiroaki H 《The FEBS journal》2006,273(21):4959-4971
PEX1 is a type II AAA-ATPase that is indispensable for biogenesis and maintenance of the peroxisome, an organelle responsible for the primary metabolism of lipids, such as beta-oxidation and lipid biosynthesis. Recently, we demonstrated a striking structural similarity between its N-terminal domain and those of other membrane-related AAA-ATPases, such as valosine-containing protein (p97). The N-terminal domain of valosine-containing protein serves as an interface to its adaptor proteins p47 and Ufd1, whereas the physiologic interaction partner of the N-terminal domain of PEX1 remains unknown. Here we found that N-terminal domains isolated from valosine-containing protein, as well as from PEX1, bind phosphoinositides. The N-terminal domain of PEX1 appears to preferentially bind phosphatidylinositol 3-monophosphate and phosphatidylinositol 4-monophosphate, whereas the N-terminal domain of valosine-containing protein displays broad and nonspecific lipid binding. Although N-ethylmaleimide-sensitive fusion protein, CDC48 and Ufd1 have structures similar to that of valosine-containing protein, they displayed lipid specificity similar to that of the N-terminal domain of PEX1 in the assays. By mutational analysis, we demonstrate that a conserved arginine surrounded by hydrophobic residues is essential for lipid binding, despite very low sequence similarity between PEX1 and valosine-containing protein. 相似文献
26.
Hirata A Watanabe S Kojima M Hata I Wake K Taki M Sasaki K Fujiwara O Shiozawa T 《Bioelectromagnetics》2006,27(8):602-612
This paper computationally verifies the effect of anesthesia on temperature variations in the rabbit eye due to microwave energy. The main reason for this investigation is that our previous paper suggested a reduction in blood flow due to the administration of anesthesia, resulting in an overestimated temperature increase. However, no quantitative investigation has yet been conducted. The finite-difference time-domain (FDTD) method is used for calculating power absorption and temperature variation in rabbits. For this purpose, we used a computational rabbit phantom, which is comprised of 12 tissues (including 6 eye tissues) with a resolution of 1 mm. Thermal constants of the rabbit were derived by comparing measured and calculated temperatures. For intense microwave exposure to the rabbit eye, time courses of calculated and measured temperatures were in good agreement for cases both with and without the administration of anesthesia. The point to be stressed is that under anesthesia the thermoregulatory response was inactivated and blood flow and basal metabolism was reduced. 相似文献
27.
28.
Yosuke Tanaka Keisuke Satoh Takayuki Takebe Satoshi Shiozawa 《Journal of experimental marine biology and ecology》2008,354(1):56-64
RNA/DNA ratio is a useful and reliable indicator of the nutritional status of fish larvae and juveniles. In order to assess the nutritional status of field-caught larval Pacific bluefin tuna Thunnus orientalis (Temminck et Schlegel), starvation experiments of hatchery-reared larvae were conducted and changes in the RNA/DNA ratio of fed and starved larvae were analyzed. Starvation experiments were conducted every 3 days after first feeding. The survival rate of Pacific bluefin tuna larvae ranged 10-50% after 1 day of starved conditions and growth retardation was observed immediately. These results suggest that Pacific bluefin tuna larvae have a very low tolerance to starvation. The RNA/DNA ratios of fed larvae were approximately 2.0-4.0. On the other hand, the value of starved larvae significantly decreased to 1.0-3.0. The nutritional status of 3 cohorts of field-caught tuna larvae collected in the northwestern Pacific Ocean was examined based on the value of the RNA/DNA ratio of the 1 day starved larvae. 4.35-25.77% of the cohorts were regarded as the “starving condition”, which was negatively correlated to the ambient prey densities. These findings suggest that the nutritional condition of larval Pacific bluefin tuna was influenced by the ambient prey density, and starvation itself and starvation-induced predation could greatly contribute to mortality in the larval period of Pacific bluefin tuna. 相似文献
29.
Karina Keller Marques da Costa Flaiban Kledir Anderson H. Spohr Luciano de Souza Malanski Walfrido Kühl Svoboda Marcos M. Shiozawa Carmen Lúcia S. Hilst Lucas Moraes Aguiar Gabriela Ludwig Fernando C. Passos Italmar Teodorico Navarro Mara Regina Stipp Balarin Júlio Augusto Naylor Lisbôa 《International journal of primatology》2008,29(5):1375-1382
We evaluated blood samples obtained from 80 free-ranging healthy capuchins (Cebus cay and C. nigritus) to establish hematological reference values and to assess the influence of sex and age on them. We caught the monkeys in
the Paraná River region of Southern Brazil via manual or automatic traps. We anesthetized them intramuscularly with 3.6 mg/kg
tiletamine/zolazepam hydrochlorides. After physical examinations, we divided the sample according to sex and age: 26 females
(13 adults and 13 juveniles) and 54 males (27 adults and 27 juveniles). We collected blood and determined hematological values
via traditional published methods. We analyzed data via 2-way ANOVA to test the effect of sex, age, and interactions between
the 2 factors. The packed-cell volume was higher in adult males and the numbers of white blood cells and lymphocytes were
higher in juveniles. There is no other significant difference. 相似文献
30.
Shima Okada Naruhiro Shiozawa Yoshihisa Fujiwara Yasushi Yasuda Masaaki Makikawa Takeo Iida 《Journal of thermal biology》2008
To clarify the effect of cold stimulation during slow-wave sleep (SWS) on the sleep cycle, we conducted a sleep experiment. Five healthy males slept on a bedding system we developed to make the inside of bedding cooler. When the subject was sleeping deeply in the second and fourth SWS, the system cooled their bedding. When the subject's sleep condition shifted toward arousal, the cold air was stopped. As a result, all subjects’ sleep stage shifted to light sleep and reached arousal. After stopping stimulation, they immediately returned to the SWS at the first stimulation. But at the second stimulation, the sleep state did not return to the SWS. 相似文献