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Search Results: 1 - 10 of 143 matches for " NMK;Miyaji "
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Entero-hepatic pathobiology: histopathology and semi-quantitative bacteriology of the duodenum
Ito, NMK;Miyaji, CI;Lima, EA;Okabayashi, S;Claure, RA;Gra?a, EO;
Revista Brasileira de Ciência Avícola , 2004, DOI: 10.1590/S1516-635X2004000100005
Abstract: duodenum swabs were harvested from 80 broilers in 15 flocks of 8 broiler farms and were submitted to bacteriological evaluation. five broiler breeders were sampled to obtain comparative data. macro and microscopic lesions in the gut and the liver were evaluated in all birds submitted to swab harvesting and also broilers of two slaughter plants. semiquantitative bacterial examination in duodenum swabs demonstrated higher microorganism growth in blood agar than in macconkey medium. staphylococcus sp, enterococcus sp and escherichia coli were found in some broiler flocks. an increased cellularity of the muscular mucosae of duodenum villi and/or the presence of some gametocytes or schizonts of coccidia were found in the lesioned gut in addition to high bacterial growth in blood agar. in some flocks, enlarged yellowish livers with vacuolated hepatocytes and/or increased reticuloendothelial response were seen in some birds. liver and gut samples were collected in two slaughter plants in order to establish a pattern of response in broilers after withdrawal of growth promoters. livers with macroscopic lesions presented microscopic lesions in the parenchyma such as increased leukocyte response in the sinusoidal space, vacuolar degeneration of hepatocytes or focal necrosis in the perilobular region, increased size or number of lymphoid nests in the perilobular region, the perivascular space and surrounding the biliary duct and increased extramedular granulocytopoiesis. duodenum with hyperemic patches showed increased cellular response in the muscular mucosa of villi. these observations support the concept that semi-quantitative bacteriology and liver lesion evaluation could be used as a model to study gut bacterial imbalance in chickens.
Infectious bursal disease virus: case report and experimental studies in vaccinated and unvaccinated SPF chickens and commercial broiler chicks
Scanavini Neto, H;Ito, NMK;Miyaji, CI;Lima, E de A;Okabayashi, S;Corrêa, ARA;Eleutério, GC;Zuanaze, MA;
Revista Brasileira de Ciência Avícola , 2004, DOI: 10.1590/S1516-635X2004000100006
Abstract: ibdv gm 11 (simbios eleven-molecular group) has been detected since 1997 in many farms of commercial broilers and layers causing high mortality (2 to 15%) and severe macro and microscopic damage in cloacal bursae, spleen, thymus, kidney and liver. five serial passages of 2050/97-gm 11 ibdv sample by cam route in spf chicken's embryonated eggs did not elicit increased embryo mortality. high mortality (100%) of 21 day-old spf leghorn chickens and severe bursal and splenic lesions were seen from 24 up to 48 hours after eye-drop inoculation of 2050/97 strain (50 ml of 10-2 dilution of 10% bursae homogenate). mortality was not detected when vaccinated spf and broiler chickens were inoculated. one dead bird was found among ten challenged unvaccinated broilers. variations in the intensity of cloacal bursae injury and spleen response were found between unvaccinated and vaccinated broiler chickens. ibdv antibodies were detected by elisa test in almost all vaccinated spf chickens before challenge while low number of commercial vaccinated and unvaccinated broilers were serologically positive (0 to 3 birds in 18). increasing ibdv antibody titers were detected after challenge with 2050/97 strain and highest gmts were found in broilers. it was concluded that 2050/97 strain is a highly virulent ibdv and spf leghorn chickens immunized with bv8 intermediate vaccine strain were resistant to the challenge. increasing susceptibility was found from experimental groups of unvaccinated broilers to vaccinated broilers and to unvaccinated spf birds. it is discussed that passive immunity was involved in the rate of protection of challenged unvaccinated broiler and in the immune response impairment after vaccination of broilers chicks. the use of a constant virus suspension with known potency to challenge the experimental birds was suitable to evaluate vaccination efficacy. evaluation of bursal and splenic responses at early and delayed time after challenge were useful to estimate vaccination
The Effects of Blended Instruction on Oral Reading Performance and their Relationships to a Five-Factor Model of Personality
Noritake Fujishiro,Isao Miyaji
Knowledge Management & E-Learning : an International Journal , 2010,
Abstract: In recent times, 'Blended Instruction' - an effective method of instructions utilizing e-Learning materials in English education - consists of an individual learning part, a collaborative learning part and a teacher instruction part. In the individual learning, students act out model dialogues in the WBT courseware which incorporated a high quantity of video and sound clips. In the collaborative learning, students perform the dialogues in pairs and assessed each other's performance. Our recent research in a high school showed that the skill of the students' oral reading was improved in most criteria of assessment through blended instruction. However, it is still not clear what kind of relationship exists between the development of the students' oral reading skills and their personalities. With this in mind, the authors have studied the effects of the blended instruction on the junior high school students' oral reading performance and their relationships to the five-factor model of personality. The result of the research shows that the skill of the students' oral reading was improved in most criteria of assessment and the blended instruction was effective for the personality group, 'Introverted unintelligent person' in the most categories of oral reading criteria as well as the personality group, 'Sociable hard-worker'. The important factor for that group in oral reading performance turned out to be 'Sense Reading'.
Surface/State Correspondence as a Generalized Holography
Masamichi Miyaji,Tadashi Takayanagi
Physics , 2015, DOI: 10.1093/ptep/ptv089
Abstract: We propose a new duality relation between codimension two space-like surfaces in gravitational theories and quantum states in dual Hilbert spaces. This surface/state correspondence largely generalizes the idea of holography such that we do not need to rely on any existence of boundaries in gravitational spacetimes. The present idea is motivated by the recent interpretation of AdS/CFT in terms of the tensor networks so called MERA. Moreover, we study this correspondence from the viewpoint of entanglement entropy and information metric. The Cramer-Rao bound in quantum estimation theory implies that the quantum fluctuations of radial coordinate of the AdS is highly suppressed in the large N limit.
First Results from the XMM-Newton Observation in the Groth-Westphal Survey Strip Region
T. Miyaji,R. E. Griffiths
Physics , 2001,
Abstract: We present the first results of the XMM-Newton observation on the Groth-Westphal Strip Field. The scheduled exposure time was 70 [ks]. We first analyzed about 50 [ks] of calibrated and cleaned EPIC-PN data, which were the only ones we could successfully process with an early version of the SAS software applicable to these observations. A total of about 110 sources have been detected in the central 10 arcmin of the PN field of view (FOV). A cross-correlation with the Hubble Space Telescope (HST) Medium Deep Survey (MDS) database shows a range of morphological properties of host galaxies of the X-ray source. Spectra of hard X-ray sources in our data indeed show absorption in the range N_H~10^{22}-10^{23} [cm^{-2}] at z~1.
Faint Source Counts from Off-source Fluctuation Analysis on Chandra Observations of the Hubble Deep Field-North
Takamitsu Miyaji,Richard E. Griffiths
Physics , 2001, DOI: 10.1086/338794
Abstract: We report the results of fluctuation analysis of the off-source field from the 1 Million second Chandra observation of the Hubble Deep Field-North (HDF-N). The distribution of the counts in cells has been compared with the expectations from the Log N - Log S model to constrain the behavior of the source number density down to a factor of several lower than the source-detection limit. Our results show that the number counts in the soft band (0.5-2 [keV]) continue to grow down to Sx = 7e-18 [erg s^{-1} cm^{-2}], possibly suggesting the emergence of a new population and agree well with a prediction of star forming galaxies by Ptak et al. (2001). For the hard band (2-10 keV), the fluctuation analysis can loosely constrain the source counts fainter than the detection limit and we found an upper limit of 10000 [srcs deg^{-2}] at Sx=2e-16 [erg s^{-1}cm^{-2}].
Faint Source Counts from the Off-source fluctuation Analysis on the Deepest Chandra Fields
Takamitsu Miyaji,Richard E. Griffiths
Physics , 2002,
Abstract: We show the results of the fluctuation analysis applied to the off-source areas from the two 1 Million second Chandra Deep Fields, including our new results on the Chandra Deep Field-South (CDF-S) in the 0.5-2 keV band in addition to those on the Chandra Deep Field-North (CDF-N), which have already been reported. The distribution of the X-ray counts in cells has been compared with the expectation from the Log N - Log S model to constrain the behavior of the source number density down to a factor of several lower than the source-detection limit. We show that our results are insensitive to the non-uniformity of the non X-ray background (NXB). Our results show that the number counts in the soft band (0.5-2 [keV]) continue to grow down to Sx =7e-18 erg/s/cm2, possibly suggesting the emergence of a new population and they agree well with a prediction of star forming galaxies.
KIMAP: Key-Insulated Mutual Authentication Protocol for RFID
Atsuko Miyaji,Mohammad Shahriar Rahman
Computer Science , 2012,
Abstract: RFID tags are heavily constrained in computational and storage capabilities, and raise numerous privacy concerns in everyday life due to their vulnerability to different attacks. Both forward security and backward security are required to maintain the privacy of a tag i.e., exposure of a tag's secret key should not reveal the past or future secret keys of the tag. We envisage the need for a formal model for backward security for RFID protocol designs in shared key settings, since the RFID tags are too resource-constrained to support public key settings. However, there has not been much research on backward security for shared key environment since Serge Vaudenay in his Asiacrypt 2007 paper showed that perfect backward security is impossible to achieve without public key settings. We propose a Key-Insulated Mutual Authentication Protocol for shared key environment, KIMAP, which minimizes the damage caused by secret key exposure using insulated keys. Even if a tag's secret key is exposed during an authentication session, forward security and `restricted' backward security of the tag are preserved under our assumptions. The notion of `restricted' backward security is that the adversary misses the protocol transcripts which are needed to update the compromised secret key. Although our definition does not capture perfect backward security, it is still suitable for effective implementation as the tags are highly mobile in practice. We also provide a formal security model of KIMAP. Our scheme is more efficient than previous proposals from the viewpoint of computational requirements.
APRAP: Another Privacy Preserving RFID Authentication Protocol
Atsuko Miyaji,Mohammad Shahriar Rahman
Computer Science , 2012,
Abstract: Privacy preserving RFID (Radio Frequency Identification) authentication has been an active research area in recent years. Both forward security and backward security are required to maintain the privacy of a tag, i.e., exposure of a tag's secret key should not reveal the past or future secret keys of the tag. We envisage the need for a formal model for backward security for RFID protocol designs in shared key settings, since the RFID tags are too resource-constrained to support public key settings. However, there has not been much research on backward security for shared key environment since Serge Vaudenay in his Asiacrypt 2007 paper showed that perfect backward security is impossible to achieve without public key settings. We propose a Privacy Preserving RFID Authentication Protocol for shared key environment, APRAP, which minimizes the damage caused by secret key exposure using insulated keys. Even if a tag's secret key is exposed during an authentication session, forward security and 'restricted' backward security of the tag are preserved under our assumptions. The notion of 'restricted' backward security is that the adversary misses the protocol transcripts which are needed to update the compromised secret key. Although our definition does not capture perfect backward security, it is still suitable for effective implementation as the tags are highly mobile in practice. We also provide a formal security model of APRAP. Our scheme is more efficient than previous proposals from the viewpoint of computational requirements.
Gumboro disease: evaluation of serological and anatomopathological responses in vaccinated broiler chickens challenged with very virulent virus strain
Bolis, DA;Paganini, FJ;Simon, VA;Zuanaze, MF;Scanavini Neto, H;Correa, ARA;Ito, NMK;
Revista Brasileira de Ciência Avícola , 2003, DOI: 10.1590/S1516-635X2003000200008
Abstract: this paper describes the effects of a strong type of vaccine - moulthrop g603 o and an intermediate-plus type of vaccine - 228e o in meat-type chickens challenged with a very virulent strain of infectious bursal disease virus (vvibdv). blood samples and bursa of fabricius were taken weekly up to 42 days of age. it was concluded that bursa of fabricius weight, bursa weight:body weight ratio, body weight and antibody titer evaluated before and after challenge with vvibdv were not enough to consistently and conclusively differentiate or estimate the protection given by vaccination. quantitative evaluation of injury intensity and the number of altered lymphoid follicles revealed that moulthrop g603 caused moderate microscopic lesions in one out of seven birds vaccinated at 14 days of age, while 228e vaccine did not induce ibd-typical microscopic lesions in the bursa of fabricius. good protection against bursal microscopic lesions was obtained when a strong type of vaccine was used before challenging with vvibdv. it was concluded that quantitative evaluation of microscopic lesions might be useful to measure the injury induced by vaccinal ibdv, as well as the level of protection and/or immunosuppression induced by ibdv challenge in vaccinated and non-vaccinated chickens.
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