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1.
Bouchra Benmansour Feriel Youssef Manel Ben Ali Bander Albogami Fehmi Boufahja 《Saudi Journal of Biological Sciences》2022,29(5):3610-3616
Between 2018 and 2020, 696 fish belonging to two species of sharks from the Family Triakidae (Mustelus mustelus and M. punctulatus) were collected from the coasts of Tunisia and inspected for parasites. Six copepod taxa (Perissopus dentatus Steenstrup & Lütken, 1861, Eudactylinella alba Wilson, 1932, Kroyeria lineata Van Beneden, 1853, Nesippus orientalis Heller, 1865 and Lernaeopoda galei Krøyer, 1837, Kroyeria sp.), four isopod species (Anilocra physodes (Linnaeus, 1758), Emetha audouini (H. Milne Edwards, 1840), Ceratothoa parallela (Otto, 1828) and Ceratothoa oestroides (Risso, 1816)) and two monogenean species (Erpocotyle sp1. And Erpocotyle sp2) were collected. A large number of global host records was reported, including the occurrence of E. audouini on M. mustelus and of Erpocotyle sp.2 on M. punctulatus. The study of the diversity of parasites per host species revealed that M. mustelus had a higher parasitic richness compared to M. punctulatus. In this study, it was provided for the first records on ectoparasites on Triakidae sharks from Tunisian coasts and their infection indices. 相似文献
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Fadime Atalay Fehmi Odabasoglu Mesut Halici Ahmet Cakir Elif Cadirci Ali Aslan Ozlem Aydin Berktas Cavit Kazaz 《化学与生物多样性》2015,12(11):1756-1767
Two lichen metabolites, rhizonaldehyde ( 1 ) and rhizonyl alcohol ( 2 ), were isolated from the acetone extract of Lobaria pulmonaria by chromatographic methods, and their chemical structures were determined by UV/VIS, IR, and 1D‐ and 2D‐NMR spectroscopic methods. The gastroprotective and in vivo antioxidant activities of extracts of L. pulmonaria and its metabolites, 1 and 2 , were investigated in indomethacin‐induced ulcer models in rats. The gastric lesions were significantly reduced by acetone, hexane, and CHCl3 extracts, with 75.3–41.5% inhibition. Rhizonyl alcohol ( 2 ) significantly reduced the gastric lesions with an inhibition rate of 84.6–42.8%, whereas rhizonaldehyde ( 1 ) significantly increased the gastric lesions. Antioxidant parameters and myeloperoxidase activities were also evaluated in the gastric tissues of the rats. Indomethacin caused oxidative stress, which resulted in lipid peroxidation in gastric tissues by decreasing the levels of the antioxidants as compared to healthy rat tissues. In contrast to indomethacin, all extracts and rhizonyl alcohol ( 2 ) caused a significant decrease in lipid peroxidation levels and an increase in antioxidant parameters, superoxide dismutase, glutathione peroxidase, and glutathione‐S‐transferase, and reduced glutathione in gastric tissues. The administration of rhizonyl alcohol ( 2 ) also resulted in a decrease in gastric myeloperoxidase activity increased by indomethacin. The gastroprotective effect of rhizonyl alcohol ( 2 ) can be attributed to its antioxidant properties and its suppressing effect on neutrophil infiltration into gastric tissues. 相似文献
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Keith Lombardo Jeffrey S. Fehmi Kevin J. Rice Emilio A. Laca 《Restoration Ecology》2007,15(2):177-178
We found no significant effect (p > 0.38) of clipping surrounding non‐native annuals on the performance or survival of plantings of the native Nassella pulchra. However, the preplanting productivity of the three sites had a significant effect (p < 0.001) on the demography and water relations of Nassella. Survival was 85% on the lowest productivity site and it decreased by 6% for each additional 100 kg in average aboveground productivity between 2,400 and 3,600 kg/ha. Plants experienced greater water stress in higher productivity sites. Together, these results suggest that the original habitat of N. pulchra may have been in more marginal ecological sites rather than the more fertile soils of the Central Valley. 相似文献
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In this study, we aimed to investigate whether there is any relationship between gastric cancer and iodine concentrations
in blood and urine in the northeast Anatolia region, where iodine deficiency is common. A total of 56 patients, diagnosed
as gastric cancer and 25 healthy volunteers were included in the study. The methods used were based on the Sandell-Kolthoff
reaction. The urine iodine concentration (UIC) and serum protein-bound iodine (PBI) levels were higher in patients with gastric
cancer compared with healthy control subjects. The UIC in stage IV was higher than all other stages and the control group.
The UIC was higher in stages III and IV compared with stages I and II. However, serum PBI levels in stage III were higher
compared with stages I, and II and also control group. The serum PBI level in stage IV was higher than stage II and the control
group. In the patient and control groups, there were no significant differences in serum PBI and UIC with regard to age or
sex. Our results suggested that urinary and blood iodine concentration might be a useful marker for following the disease. 相似文献
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There are numerous reports on the effects of electromagnetic radiation (EMR) in various cellular systems. Melatonin and caffeic
acid phenethyl ester (CAPE), a component of honeybee propolis, were recently found to be potent free radical scavengers and
antioxidants. Mechanisms of adverse effects of EMR indicate that reactive oxygen species may play a role in the biological
effects of this radiation. The present study was carried out to compare the efficacy of the protective effects of melatonin
and CAPE against retinal oxidative stress due to long-term exposure to 900 MHz EMR emitting mobile phones. Melatonin and CAPE
were administered daily for 60 days to the rats prior to their EMR exposure during our study. Nitric oxide (NO, an oxidant
product) levels and malondialdehyde (MDA, an index of lipid peroxidation), were used as markers of retinal oxidative stress
in rats following to use of EMR. Superoxide dismutase (SOD), catalase (CAT), and glutathione peroxidase (GSH-Px) activities were studied to evaluate the changes of antioxidant status in retinal tissue. Retinal levels of NO and MDA increased
in EMR exposed rats while both melatonin and CAPE caused a significant reduction in the levels of NO and MDA. Likewise, retinal
SOD, GSH-Px and CAT activities decreased in EMR exposed animals while melatonin and CAPE caused a significant increase in the activities
of these antioxidant enzymes. Treatment of EMR exposed rats with melatonin or CAPE increased the activities of SOD, GSH-Px and CAT to higher levels than those of control rats. In conclusion, melatonin and CAPE reduce retinal oxidative stress after
long-term exposure to 900 MHz emitting mobile phone. Nevertheless, there was no statistically significant difference between
the efficacies of these two antioxidants against to EMR induced oxidative stress in rat retina. The difference was in only
GSH-Px activity in rat retina. Melatonin stimulated the retinal GSH-Px activity more efficiently than CAPE did. 相似文献
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Koyu A Gokcimen A Ozguner F Bayram DS Kocak A 《Molecular and cellular biochemistry》2006,284(1-2):81-85
Abstact Cadmium is one of the most toxic pollutants in environment. Cadmium accumulation in blood affects the renal cortex and causes
renal failure. In this study, we aimed to evaluate the effects of cadmium on rat liver tissue. Eighteen male albino rats aged
ten weeks old were used in the study. 15 ppm of cadmium was administered to rats via consumption water daily. At the end of
the 30th study day, the animals were killed under ether anesthesia. After the liver tissue samples were taken, histopathological
and biochemical examinations were performed. Histopathologic changes have included vacuolar and granular degenerations in
hepatocytes, heterochromatic nucleuses and sinusoidal and portal widenings. Central vein diameters were normal in cadmium
exposed group. Whereas, there was statistically significant difference between two groups by means of sinusoidal (p< 0.001) and portal triad diameters (p< 0.01). Malondialdehyde (MDA) is an indicator of lipid peroxidation. In this study, MDA was used as a marker of oxidative
stress-induced liver impairment in cadmium exposed rats. Superoxide dismutase (SOD) and catalase (CAT) activities were also
measured to evaluate the changes in antioxidative system in liver tissues. Current findings showed that MDA levels were increased
and SOD and CAT activities were decreased in cadmium exposed group compared to control group. The difference between two groups
was statistically significant (pvalues: MDA,p< 0.01; CAT,p< 0.01 and SOD,p< 0.05). In conclusion, these findings suggest the role of oxidative mechanisms in cadmium-induced liver tissue damage 相似文献
9.
Hasan Temiz Emin Okumus Umut Aykut Muhammet Dervisoğlu Fehmi Yazici 《World journal of microbiology & biotechnology》2008,24(9):1851-1855
In the present study, turkey proventriculus (stomach) was mixed with 10% NaCl (1:2 w/v) and extracted by centrifugation to
produce crude extract. The partial purification of the extract was carried out by using Sephadex G-75 resin in gel filtration
column chromatography. Crude extract (CE) and fractions obtained by gel filtration were analysed for milk-clotting activity
(MCA), protein content, proteolytic activity (PA), and SDS-PAGE electrophoresis. The first 7 fractions did not have any activities;
the fraction of 9, 10 and 11 had the most milk-clotting and proteolytic activities. Electrophoretic patterns proved that further
purification steps should be applied for better results. 相似文献
10.
Effects of Burning and Grazing on a Coastal California Grassland 总被引:5,自引:2,他引:3
Daphne A. Hatch James W. Bartolome Jeffrey S. Fehmi Deborah S. Hillyard 《Restoration Ecology》1999,7(4):376-381
We tested the effects of fall burning and protection from livestock grazing as management to enhance native grasses on a coastal grassland in central California. Plants from the Mediterranean, introduced beginning in the late 1700s, have invaded and now dominate most of California's grasslands. Coastal grasslands are generally less degraded than those inland and have higher potential for restoration and conservation. Productivity of the experimental plots varied annually and declined over the course of the study because of rainfall patterns. Foliar cover of the native Danthonia californica (California oatgrass) increased more under grazing than grazing exclusion and did not respond to burning. Two other natives, Nassella pulchra (purple needlegrass) and Nassella lepida (foothill needlegrass), responded variably to treatments. The response of N. pulchra differed from that reported on more inland sites in California. Restoring these grasslands is complicated by differing responses of target species to protection from grazing and burning. The current practice of managing to enhance single species of native plants (e.g., N. pulchra) may be detrimental to other equally important native species. 相似文献