气动真空发生器系统背压与抽吸性能关系分析   总被引：1，自引：0，他引：1  

郭钟华  李小宁  香川利春 《农业机械学报》2015,46(2):312-315,350

对气动系统中常用的真空发生器样机,采用有限体积法对其内部流场进行数值计算,分析了背压不同时内部压力分布和吸入流速改变情况。以此为基础,测量系统背压升高时吸入流量变化量,绘制了背压与吸入流量关系曲线,提出了通过判断系统背压防止逆流现象的方法。在真空发生器系统的设计和应用中,需要在理论计算的基础上,根据试验得出系统正常工作的背压范围,防止逆流现象,保证系统工作。  相似文献   

Evaluation of cytokine messenger RNA expression in peripheral blood mononuclear cells from dogs with canine demodicosis     

Tani K  Morimoto M  Hayashi T  Inokuma H  Ohnishi T  Hayashiya S  Nomura T  Une S  Nakaichi M  Taura Y 《The Journal of veterinary medical science / the Japanese Society of Veterinary Science》2002,64(6):513-518

Using RT-PCR and semi-quantitative PCR, mRNA expression for canine interferon (IFN)-gamma, interleukin (IL)-2, IL-4, IL-5, IL-10, tumor necrosis factor (TNF)-alpha and transforming growth factor (TGF)-beta in peripheral blood mononuclear cells (PBMCs) was examined in dogs with or without demodicosis. mRNA expression for IFN-gamma as well as TNF-alpha in dogs with demodicosis (localized (LD) and generalized (GD)) was slightly lower than those in dogs without demodicosis (healthy controls). Expression of IL-5 mRNA in dogs with demodicosis was higher than that in control dogs, but there were no significant differences in IL-4 and IL-10 mRNA expression levels among the three groups. On the other hand, expression levels of TGF-beta mRNA in dogs with GD were higher than those in control dogs and dogs with LD. The expression levels of IL-5 and TGF-beta mRNA decreased in all three dogs with GD which showed resolution of the clinical signs. Taken together, these results suggest that the Th2-like response in PBMCs from dogs with demodicosis is up-regulated, and that subsequent increased expression of IL-5 and TGF-beta mRNA in dogs with GD is reversible after treatment. Therefore, these cytokines, particularly IL-5, might be a useful clinical index of the clinical course in demodicosis. Also, increased TGF-beta mRNA expression might be a key factor for revealing the difference in the mechanism of onset between LD and GD.  相似文献   

Validity of data filtering technique for the behavior analysis of crab in neritic and closed sea by ultrasonic biotelemetry     

Yoshinori Miyamoto  Keiichi Uchida  Reiko Orii  Toshiharu Kakihara  Masahiko Furusawa 《Fisheries Science》2006,72(1):211-213

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Isolation of a bacteriophage in Fusobacterium necrophorum   总被引：2，自引：0，他引：2  

H Tamada  R Harasawa  T Shinjo 《Nippon juigaku zasshi. The Japanese journal of veterinary science》1985,47(3):483-486

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Experimental studies on sulfur dioxide injuries in higher plants     

Hirofumi Tanaka  Toshiharu Takanashi  Masaya Kadota  Michihiko Yatazawa 《Water, air, and soil pollution》1972,1(4):343-346

Photosynthesis is reversibly inhibited by exposing plants to SO₂. The formation of α-hydroxy sulfonate in the exposed plants is suggested as one of the effects, because this compound inhibits glycolic oxidase which is necessary in the glycolic acid pathway. The suppression of the glycolic acid path should affect various aspects of metabolism in plants, particularly the reduction of the biosynthesis of glycine and serine. In this paper, the biosynthesis of these amino acids in plants exposed to SO₂ was investigated to estimate the significance of the formation of α-hydroxy sulfonate in the plants. The results show that photosynthetic formation of serine was reduced in the exposed plants, and that α-hydroxy sulfonate was formed.  相似文献   

Axle-less F1-ATPase rotates in the correct direction     

Furuike S  Hossain MD  Maki Y  Adachi K  Suzuki T  Kohori A  Itoh H  Yoshida M  Kinosita K 《Science (New York, N.Y.)》2008,319(5865):955-958

F1-adenosine triphosphatase (ATPase) is an ATP-driven rotary molecular motor in which the central gamma subunit rotates inside a cylinder made of three alpha and three beta subunits alternately arranged. The rotor shaft, an antiparallel alpha-helical coiled coil of the amino and carboxyl termini of the gamma subunit, deeply penetrates the central cavity of the stator cylinder. We truncated the shaft step by step until the remaining rotor head would be outside the cavity and simply sat on the concave entrance of the stator orifice. All truncation mutants rotated in the correct direction, implying torque generation, although the average rotary speeds were low and short mutants exhibited moments of irregular motion. Neither a fixed pivot nor a rigid axle was needed for rotation of F1-ATPase.  相似文献   

Magnetic vortex core observation in circular dots of permalloy     

Shinjo T  Okuno T  Hassdorf R  Shigeto K  Ono T 《Science (New York, N.Y.)》2000,289(5481):930-932

Spin structures of nanoscale magnetic dots are the subject of increasing scientific effort, as the confinement of spins imposed by the geometrical restrictions makes these structures comparable to some internal characteristic length scales of the magnet. For a vortex (a ferromagnetic dot with a curling magnetic structure), a spot of perpendicular magnetization has been theoretically predicted to exist at the center of the vortex. Experimental evidence for this magnetization spot is provided by magnetic force microscopy imaging of circular dots of permalloy (Ni(80)Fe(20)) 0.3 to 1 micrometer in diameter and 50 nanometers thick.  相似文献   

High-throughput mapping of a dynamic signaling network in mammalian cells     

Barrios-Rodiles M  Brown KR  Ozdamar B  Bose R  Liu Z  Donovan RS  Shinjo F  Liu Y  Dembowy J  Taylor IW  Luga V  Przulj N  Robinson M  Suzuki H  Hayashizaki Y  Jurisica I  Wrana JL 《Science (New York, N.Y.)》2005,307(5715):1621-1625

Signaling pathways transmit information through protein interaction networks that are dynamically regulated by complex extracellular cues. We developed LUMIER (for luminescence-based mammalian interactome mapping), an automated high-throughput technology, to map protein-protein interaction networks systematically in mammalian cells and applied it to the transforming growth factor-beta (TGFbeta) pathway. Analysis using self-organizing maps and k-means clustering identified links of the TGFbeta pathway to the p21-activated kinase (PAK) network, to the polarity complex, and to Occludin, a structural component of tight junctions. We show that Occludin regulates TGFbeta type I receptor localization for efficient TGFbeta-dependent dissolution of tight junctions during epithelial-to-mesenchymal transitions.  相似文献   

Pathogenicity of a non-hemagglutinating mutant strain of Fusobacterium necrophorum biovar A in mice   总被引：1，自引：0，他引：1  

T Shinjo  H Kiyoyama 《Nippon juigaku zasshi. The Japanese journal of veterinary science》1986,48(3):523-527

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Synergism and stability of acetamiprid resistance in a laboratory colony of Plutella xylostella     

Ninsin KD  Tanaka T 《Pest management science》2005,61(8):723-727

The involvement of metabolic enzymes in the resistance of a laboratory colony of diamondback moth, Plutella xylostella (L), to the neonicotinoid insecticide acetamiprid was determined with the synergists piperonyl butoxide (PBO), which suppresses the activity of cytochrome P-450 monooxygenases, and S,S,S-tributyl phosphorotrithioate (DEF), an inhibitor of esterases, using the leaf-dipping method. Both PBO and DEF enhanced the insecticidal activity of acetamiprid significantly in the resistant P. xylostella strain but not in a reference strain, suggesting that cytochrome P-450 monooxygenases and esterases play an important role in the resistance of P. xylostella to acetamiprid. The resistant P. xylostella strain was also reared without further exposure to acetamiprid to determine the stability of resistance. Maintaining the resistant strain for seven generations in the absence of selection pressure resulted in a drop in resistance ratio from 110 to 2.42, indicating that acetamiprid resistance in P. xylostella is not stable.  相似文献