排序方式: 共有17条查询结果,搜索用时 15 毫秒
1.
Loste A Ramos JJ Sáez T Sever R Marca MC 《The Canadian veterinary journal. La revue veterinaire canadienne》2003,44(2):140-142
A 6-year old Salz ram was presented with a history of poor body condition, progressive gait abnormalities, pelvic limb lameness, and difficulty with copulation. Based on the history, clinical signs, hip palpation, and radiography, a diagnosis of hip dysplasia, previously unreported in sheep, was made. 相似文献
2.
Yoldas Seki Mehmet Sarikanat Kutlay Sever Seckin Erden H. Ali Gulec 《Fibers and Polymers》2010,11(8):1159-1164
We investigated the surface modification of jute fiber by oxygen plasma treatments. Jute fibers were treated in different
plasma reactors (radio frequency “RF” and low frequency “LF” plasma reactors) using O2 for different plasma powers to increase the interface adhesion between jute fiber and polyester matrix. The influence of
various plasma reactors on mechanical properties of jute fiber-reinforced polyester composites was reported. Tensile, flexure,
short beam shear tests were used to determine the mechanical properties of the composites. The interlaminar shear strength
increased from 11.5 MPa for the untreated jute fiber/polyester composite to 19.8 and 26.3 MPa for LF and RF oxygen plasma
treated jute fiber/polyester composites, respectively. O2 plasma treatment also improved the tensile and flexural strengths of jute fiber/ polyester composites for both plasma systems.
It is clear that O2 plasma treatment of jute fibers by using RF plasma system instead of using LF plasma system brings about greater improvement
on the mechanical properties of jute/polyester composites. 相似文献
3.
Transmission of simian acquired immunodeficiency syndrome (SAIDS) with blood or filtered plasma 总被引:4,自引:0,他引:4
M Gravell W T London S A Houff D L Madden M C Dalakas J L Sever K G Osborn D H Maul R V Henrickson P A Marx 《Science (New York, N.Y.)》1984,223(4631):74-76
Simian acquired immunodeficiency syndrome (SAIDS), a disease clinically and pathologically similar to acquired immunodeficiency syndrome in humans, was transmitted from diseased rhesus monkeys (Macaca mulatta) to normal monkeys by inoculation with heparinized whole blood or plasma that had been passed through filters of 0.45 micrometer pore size. This suggests that the causative agent is small and most probably a virus. No viruses, however, were isolated by standard cell culture techniques from the blood or filtered plasma which caused SAIDS. Both cellular and humoral immunity were markedly depressed in animals with advanced SAIDS. 相似文献
4.
Subacute sclerosing panencephalitis: isolation of suppressed measles virus from lymph node biopsies 总被引:26,自引:0,他引:26
L Horta-Barbosa R Hamilton B Wittig D A Fuccillo J L Sever M L Vernon 《Science (New York, N.Y.)》1971,173(999):840-841
Measles virus was isolated in mixed cultures of lymph node cells and HeLa cells. The agent was isolated by cocultivation from biopsy specimens of two of five patients with subacute sclerosing panencephalitis. The virus was identified by hemagglutination-inhibition, immunofluorescent, and neutralization tests. Biopsies from controls did not show evidence of measles virus. 相似文献
5.
Enhancement of the mechanical and vibrational properties of glass/polyester composites was aimed via matrix modification technique.
To achieve this, unsaturated polyester was modified by incorporation of oligomeric siloxane in the concentration range of
1–3 wt%. Modified matrix composites reinforced with woven roving glass fabric were compared with untreated glass/polyester
in terms of mechanical and interlaminar properties by conducting tensile, flexure, and short-beam shear tests. It was found
that after incorporation of 3 % oligomeric siloxane into the polyester matrix, the tensile, flexural, and interlaminar shear
strength (ILSS) values of the resulting composite increased by 16, 15, and 75 %, respectively. The increases in ILSS as well
as in tensile and flexural properties were considered to be an indication of better fiber/matrix interaction as confirmed
by SEM fractography images. Furthermore, the effect of oligomeric siloxane incorporation on the vibrational properties of
the composites was investigated by experimental modal testing and the natural frequencies of the composites were found to
increase with increasing siloxane concentration. 相似文献
6.
Genital herpesvirus hominis type 2 infection: an experimental model in cebus monkeys 总被引:4,自引:0,他引:4
A J Nahmias W T London L W Catalano D A Fuccillo J L Sever C Graham 《Science (New York, N.Y.)》1971,171(968):297-298
Genital infection with herpesvirus hominis type 2 was established in ten female cebus monkeys. Clinical and laboratory findings in the cebus mimic closely those observed in humans, thus providing an experimental model which may be used in the study of the possible role of genital herpetic infection in cervical cancer and in perinatal and chronic neurological diseases. 相似文献
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8.
Mastelić J Jerković I Blazević I Poljak-Blazi M Borović S Ivancić-Baće I Smrecki V Zarković N Brcić-Kostic K Vikić-Topić D Müller N 《Journal of agricultural and food chemistry》2008,56(11):3989-3996
Four derivatives of thymol, carvacrol, and eugenol were synthesized: 4-(hydroxymethyl)-5-isopropyl-2-methylphenol, 4,4'-methylenebis(5-isopropyl-2-methyl)phenol, 4-allyl-6-(hydroxymethyl)-2-methoxyphenol, and 4-(hydroxymethyl)-2-isopropyl-5-methylphenol. The obtained derivatives showed remarkably better antioxidative properties according to 1,1-diphenyl-2-picrylhydrazyl assay (50% inhibitory concentrations = 4-156 microg/mL) and Rancimat assay (protection factors = 1.55-5.84) when compared with parent compounds and values similar to or better than those of butylated hydroxytoluene and vitamin C. At concentrations of 10 mM carvacrol derivatives had no toxic effect on viability of Escherichia coli K-12 (determined by minimum inhibitory concentrations). Other phenol derivatives showed reduced cytotoxic effect on E. coli K-12 at concentrations of 2-5 mM on the basis of 50% lethal dose measurements. In comparison with the parent compounds, phenol derivatives showed reduced cytotoxic effect for Saccharomyces cerevisiae cells (determined by yeast colony reduction). On the other hand, the majority of synthesized compounds had dose-dependent antiproliferative effects on human uterine carcinoma cells (HeLa), which makes them potentially interesting for the adjuvant experimental cancer treatments. The 4,4'-methylenebis(5-isopropyl-2-methyl)phenol derivative of carvacrol showed lower inhibiting capacity also for the HeLa cells, which makes this particular derivative attractive as an efficient antioxidant with negligible cytotoxic effects. 相似文献
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10.
Igor Jerkovi Ana-Marija Ciko Sanja Babi Lara imek Krunoslav Bojani Krunoslav Aladi Nikolay V. Ulyanovskii Dmitry S. Kosyakov Albert T. Lebedev Rozelindra o-Rakovac Polonca Trebe Stela Joki 《Marine drugs》2021,19(5)
The endemic brown macroalga Fucus virsoides J. Agardh from the Adriatic Sea was in the focus of the present research. The volatiles of fresh (FrFv) and air-dried (DrFv) samples of F. virsoides obtained by headspace solid-phase microextraction (HS-SPME) and hydrodistillation (HD) were analyzed by gas chromatography equipped with flame ionization detector and mass spectrometry (GC-FID/MS). The major HS-FrFv compound was pentadecane (61.90–71.55%) followed by pentadec-1-ene (11.00–7.98%). In HS-DrFv, pentadec-1-ene was not present, and few lower aliphatic compounds appeared, as well as benzaldehyde and benzyl alcohol. In HD-FrFv, particularly abundant were alkenes (such as pentadec-1-ene (19.32%), or (E)-pentadec-7-ene (8.35%)). In HD-DrFv, more oxidation products were present (e.g., carbonyl compounds such as tridecanal (18.51%)). The fatty acids profile of freeze-dried sample (FdFv) after conversion to methyl esters was determined by GC-FID, and oleic acid was dominant (42.28%), followed by arachidonic acid (15.00%). High-performance liquid chromatography-high-resolution mass spectrometry with electrospray ionization (HPLC-ESI-HRMS) was used for the screening of less polar fractions (F3 and F4) of F. virsoides. Mono- and diglycerides of stearic, palmitic, oleic, and arachidonic acids were found. Terpenoids and steroids comprised the compounds C20H30(32)O2 and C29H48O(2). Among carotenoids, fucoxanthin was identified. Chlorophyll derivatives were also found (C55H74(72)N4O(5-7)), dominated by pheophytin a. The antioxidant activity of the fractions was investigated by in vitro assays (oxygen radical absorbance capacity (ORAC), reduction of radical cation (ABTS•+), 2,2-diphenyl-1-picryl-hydrazyl-hydrate (DPPH) assay, and ferric reducing antioxidant power (FRAP)) and by in vivo zebrafish model (along with fish embryotoxicity). In vitro experiments proved good radical scavenging abilities of F3 and F4 fractions, which were additionally supported by the protective effect against hydrogen peroxide-induced oxidative stress in zebrafish embryos. 相似文献