181 research outputs found
15-yıllık periyotta İstanbul Türkiye’de dermatofitoz şüpheli köpek ve kedilerden izole edilen dermatofitler: Güncellenmiş rapor
The present research was aimed to determine the prevalence of dermatophytes isolated from symptomatic dogs
and cats, within a 15-year-period, in the city of Istanbul, Turkey. Dermatological specimens were collected from
1504 dogs and 846 cats, which were presented clinical signs of ringworm. Direct microscopy and mycological
cultures were performed. The fungal growth rate was detected at 8.2% and 22.8% from dogs and cats,
respectively. Microsporum canis was the most frequently isolated species followed by Trichophyton spp., M. gypseum, T.
mentagrophytes, M. nanum, other Microsporum spp. moreover T. tonsurans. The cats less than two-year age and more
than ten-year age showed a statistically significant higher isolation rate of infection (p < 0.05). There were no
statistically significant differences between the age of the dogs and the dermatophyte isolation rate and between
the gender of the dogs and cats and the dermatophyte isolation rate. As a conclusion, the data suggest an updated
report on local epidemiology and define potential etiologic agentsBu araştırma, İstanbul ilinde 15 yıllık bir süre içinde semptomatik köpek ve kedilerden izole edilen dermatofitlerin
yaygınlığını belirlemeyi amaçlamıştır. Dermatolojik örnekler ringworm klinik belirtileri gösteren 1504 köpek ve
846 kediden toplandı. Direkt mikroskopi ve mikolojik kültürler yapıldı. Mantar üreme oranları, köpeklerde % 8.2
kedilerde % 22.8 olarak saptandı. En sık izole edilen tür Microsporum canis idi. Bunu Trichophyton spp., M. gypseum, T.
mentagrophytes, M. nanum, diğer Microsporum spp. ve T. tonsurans takip etti. İki yaşından küçük ve on yaşından büyük
kediler, istatistiksel olarak anlamlı derecede yüksek bir etken izolasyon oranı gösterdi (p <0.05). Köpeklerin yaşı ve
dermatofit izolasyon oranları ile kedi ve köpeklerin cinsiyeti ve dermatofit izolasyon oranları arasında istatistiksel
olarak anlamlı bir fark bulunmadı. Sonuç olarak, veriler yerel epidemiyoloji üzerine güncel bir rapor sunmakta ve
olası etiyolojik ajanları tanımlamaktadır
Isochrysis affinis galbana ve Phaeodactylum tricornutum Kültürlerinde Kuru Madde Tahminlerinin Karşılaştırılması
Isochrysis affinis galbana tek hücreli denizel bir mikroalg türü olup yüksek miktarda uzun zincirli doymamış yağ asitleri (PUFA) içermesinden dolayı akuakültürde özellikle bivalvia larvalarının beslenmesinde canlı yem kaynağı olarak kullanılmaktadır. Phaeodactylum tricornutum ise oval ve fusiform hücre şekilleri olan tek hücreli pennat bir diyatom türüdür. Phaeodactylum tricornutum %30-45 arasında uzun zincirli doymamış yağ asitlerini (PUFA) içermekte ve bu oranın da %20-40’ını eikosapentaenoik asit (EPA) oluşturmaktadır. Esansiyel yağ asitlerinden eikosapentaenoik asit'in önemli potansiyel kaynağı olarak düşünülen mikroalgler insan gıdası olarak ve akuakültürde hayvan beslenmesinde kullanılmaktadır. Çalışmada, Isochrysis affinis galbana ve Phaeodactylum tricornutum kültürlerine ait kuru madde miktarlarının çoklu regresyon analizi yöntemi kullanılarak tahmin edilmesi amaçlanmıştır. Türler, F/2 besi ortamında %20 aşılama oranı ile kontrol grubu ve %50 oranında azotun eksiltildiği besi ortamı kullanılarak, laboratuvar ortamında kültüre alınmıştır. Deneme süresince optik yoğunluk, kuru madde ve klorofil a günlük olarak ölçülmüştür. Türlere ait kontrol grubu ve %50 oranında azotun eksiltildiği gruplarda optik yoğunluk ve klorofil a kullanılarak matematiksel bir model oluşturulmuştur. Bu modellerin önem testleri yapılıp, R2 ve HKO bulunmuştur
Tribological evaluation of solid lubricant enriched in modified Jatropha-Based Oil as Minimum Quantity Lubrication (MQL) oil for composite material
The use of lubricant during the machining process plays an important
role to reduce friction and wear. Mineral-based oil is the most widely used lubricant
that provided high-quality lubrication properties. However, mineral-based oil
has poor biodegradability and causes long-term pollution to the environment and
harmful to human. Implementation of environmental-friendly lubricant was encouraged
to achieve sustainable manufacturing practices. The inherent biodegradability
of vegetable-based oil with solid particle offers greater benefit to the environment
and lubrication performance. The study aims to evaluate the influence of green solid
particle (hexagonal boron nitride, hBN) enriched in the modified jatropha oil (MJO)
through tribology testing using four-ball tribotestermachine. hBN particlewas added
inMJOat various concentration ratio; 0.05wt% and 0.5wt%. TheMJOsamples were
compared with the crude jatropha oil and commercial synthetic ester. The tribology
testing was conducted according to ASTM D4712. The value of coefficient of friction,
wear scar diameter, worn surface analysis and surface roughness were evaluated.
The lowest concentration of hBN particles in MJO (MJO + 0.05 wt% hBN)
has reduced the coefficient of friction with smaller wear scar diameter and better
surface roughness quality. The worn surface analysis from the ball lubricate byMJO
+ 0.05 wt% hBN had light and shallow grooves. The study proved that MJO +
0.05 wt% hBN exhibits better lubrication ability and suitable as an alternative for
the environmental-friendly lubricant especially for minimum quantity lubrication
(MQL) oil
Nuclear anomalies in the buccal cells of calcite factory workers
The micronucleus (MN) assay on exfoliated buccal cells is a useful and minimally invasive method for monitoring genetic damage in humans. To determine the genotoxic effects of calcite dust that forms during processing, MN assay was carried out in exfoliated buccal cells of 50 (25 smokers and 25 non-smokers) calcite factory workers and 50 (25 smokers and 25 non-smokers) age- and sex-matched control subjects. Frequencies of nuclear abnormalities (NA) other than micronuclei, such as binucleates, karyorrhexis, karyolysis and ‘broken eggs', were also evaluated. Micronuclei and the other aforementioned anomalies were analysed by two way analysis of covariance. The linear correlations between the types of micronucleus and nuclear abnormalities were determined by Spearman's Rho. There was a positive correlation between micronuclei and other types of nuclear abnormalities in accordance with the Spearman's Rho test. Results showed statistically significant difference between calcite fabric workers and control groups. MN and NA frequencies in calcite fabric workers were significantly higher than those in control groups (p < 0.05). The results of this study indicate that calcite fabric workers are under risk of significant cytogenetic damage
Search for gamma-ray emission from magnetars with the Fermi Large Area Telescope
We report on the search for 0.1-10 GeV emission from magnetars in 17 months
of Fermi Large Area Telescope (LAT) observations. No significant evidence for
gamma-ray emission from any of the currently-known magnetars is found. The most
stringent upper limits to date on their persistent emission in the Fermi-LAT
energy range are estimated between ~10^{-12}-10^{-10} erg/s/cm2, depending on
the source. We also searched for gamma-ray pulsations and possible outbursts,
also with no significant detection. The upper limits derived support the
presence of a cut-off at an energy below a few MeV in the persistent emission
of magnetars. They also show the likely need for a revision of current models
of outer gap emission from strongly magnetized pulsars, which, in some
realizations, predict detectable GeV emission from magnetars at flux levels
exceeding the upper limits identified here using the Fermi-LAT observations.Comment: ApJ Letters in press; Corresponding authors: Caliandro G. A., Hadasch
D., Rea N., Burnett
Detection of Gamma-Ray Emission from the Starburst Galaxies M82 and NGC 253 with the Large Area Telescope on Fermi
We report the detection of high-energy gamma-ray emission from two starburst
galaxies using data obtained with the Large Area Telescope on board the Fermi
Gamma-ray Space Telescope. Steady point-like emission above 200 MeV has been
detected at significance levels of 6.8 sigma and 4.8 sigma respectively, from
sources positionally coincident with locations of the starburst galaxies M82
and NGC 253. The total fluxes of the sources are consistent with gamma-ray
emission originating from the interaction of cosmic rays with local
interstellar gas and radiation fields and constitute evidence for a link
between massive star formation and gamma-ray emission in star-forming galaxies.Comment: Submitted to ApJ Letter
Fermi Gamma-ray Imaging of a Radio Galaxy
The Fermi Gamma-ray Space Telescope has detected the gamma-ray glow emanating
from the giant radio lobes of the radio galaxy Centaurus A. The resolved
gamma-ray image shows the lobes clearly separated from the central active
source. In contrast to all other active galaxies detected so far in high-energy
gamma-rays, the lobe flux constitutes a considerable portion (>1/2) of the
total source emission. The gamma-ray emission from the lobes is interpreted as
inverse Compton scattered relic radiation from the cosmic microwave background
(CMB), with additional contribution at higher energies from the
infrared-to-optical extragalactic background light (EBL). These measurements
provide gamma-ray constraints on the magnetic field and particle energy content
in radio galaxy lobes, and a promising method to probe the cosmic relic photon
fields.Comment: 27 pages, includes Supplementary Online Material; corresponding
authors: C.C. Cheung, Y. Fukazawa, J. Knodlseder, L. Stawar
Fermi Large Area Telescope observations of PSR J1836+5925
The discovery of the gamma-ray pulsar PSR J1836+5925, powering the formerly
unidentified EGRET source 3EG J1835+5918, was one of the early accomplishments
of the Fermi Large Area Telescope (LAT). Sitting 25 degrees off the Galactic
plane, PSR J1836+5925 is a 173 ms pulsar with a characteristic age of 1.8
million years, a spindown luminosity of 1.1 erg s, and a
large off-peak emission component, making it quite unusual among the known
gamma-ray pulsar population. We present an analysis of one year of LAT data,
including an updated timing solution, detailed spectral results and a long-term
light curve showing no indication of variability. No evidence for a surrounding
pulsar wind nebula is seen and the spectral characteristics of the off-peak
emission indicate it is likely magnetospheric. Analysis of recent XMM
observations of the X-ray counterpart yields a detailed characterization of its
spectrum, which, like Geminga, is consistent with that of a neutron star
showing evidence for both magnetospheric and thermal emission.Comment: Accepted to Astrophysical Journa
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