The Experts below are selected from a list of 360 Experts worldwide ranked by ideXlab platform
Jamshidkhan Chamani - One of the best experts on this subject based on the ideXlab platform.
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an antioxidant peptide derived from ostrich Struthio camelus egg white protein hydrolysates
Food Research International, 2012Co-Authors: Hamid Tanzadehpanah, Ahmad Asoodeh, Jamshidkhan ChamaniAbstract:Abstract Ostrich (Struthio camelus) egg white (OEW) proteins were hydrolyzed using various proteases (α-chymotrypsin, pepsin, trypsin and papain). Antioxidant activities of hydrolysates were evaluated using 1, 1-diphenyl-2-picrylhydrazyl (DPPH) radical scavenging and iron chelating activity. The hydrolysate obtained by trypsin exhibited the highest antioxidant activity. This hydrolysate was passed through an ultrafiltration membrane with a 3 kDa-cut off, and the resulting filtrate was purified using reversed-phase high performance liquid chromatography (RP-HPLC). Eight peptide fractions were separated and their antioxidant activities were tested. The results showed that the F6 fraction possessed the highest antioxidant activity in the inhibition of linoleic acid autoxidation (86.4% at 20 μg/ml), scavenging activity for DPPH radical (81% at 200 μg/ml) and 2, 2-azino-bis (3-ethylbenzothiazoline-6-sulphonicacid) diammonium salt (ABTS) radical (37.6% at 90.9 μg/ml). In addition, the iron chelating activity, hydroxyl radical scavenging and reducing power of the F6 fraction were 20% at 317.5 μg/ml, 28.6% at 163.9 μg/ml and 0.083 at 113.6 μg/ml, respectively. The peptide sequence was found to be LTEQESGVPVMK (with a molecular mass of 1317.65 Da) using mass spectrometry. The results suggest that the digestion of OEW proteins by trypsin protease could be exploited to produce natural antioxidants.
Jerome M Siegel - One of the best experts on this subject based on the ideXlab platform.
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sleep in ostrich chicks Struthio camelus
Sleep, 2021Co-Authors: Oleg I Lyamin, Anton S Kibalnikov, Jerome M SiegelAbstract:It has been reported that adult ostriches displayed the longest episodes of rapid eye movement (REM) sleep (up to 5 min) and more REM sleep (24% of the nighttime) than any other bird species. If the mammalian ontogenetic trend exists in the ostrich, then the amounts of REM and the duration of sleep episodes in young ostriches may be greater than those reported in adults. We investigated sleep in 1.5-3.5 month old ostrich chicks. Recordings were conducted during nighttime (20:00-08:00), the main sleep period in ostriches, which are diurnal. The polygrams were scored in 4-s epochs for waking, non-rapid eye movement (NREM) sleep and REM sleep, as in other bird studies. REM sleep in ostrich chicks occurred during both cortical EEG activation and during slow waves, as was described in adult ostriches. The chicks spent 69.3% ± 1.5% of the night in NREM sleep. REM sleep occupied 14.1% ± 1.8% of the night or 16.8% ± 2.0% of nighttime sleep. Episodes of REM sleep lasted on average 10 ± 1 s and ranged between 4 and 40 s. Therefore, the total amount and duration of REM sleep episodes in ostrich chicks were substantially smaller than reported in adult ostriches while the amounts of NREM sleep did not greatly differ. The developmental profile of REM sleep ontogenesis in the ostrich may be remarkably different from what has been reported in all studied mammals and birds.
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sleep in ostrich chicks Struthio camelus
Sleep, 2020Co-Authors: Oleg I Lyamin, Anton S Kibalnikov, Jerome M SiegelAbstract:It has been reported that adult ostriches displayed the longest episodes of REM sleep (up to 5 min) and more REM sleep (24% of the nighttime) than any other bird species. If the mammalian ontogenetic trend exists in the ostrich, then the amounts of REM and the duration of sleep episodes in young ostriches may be greater than those reported in adults. We investigated sleep in 1.5-3.5 month old ostrich chicks. Recordings were conducted during nighttime (20:00-08:00), the main sleep period in ostriches, which are diurnal. The polygrams were scored in 4-sec epochs for waking, NREM (non-rapid eye movement) sleep and REM sleep, as in other bird studies. REM sleep in ostrich chicks occurred during both cortical EEG activation and during slow waves, as was described in adult ostriches. The chicks spent 69.3±1.5 of the night in NREM sleep. REM sleep occupied 14.1±1.8% of the night or 16.8±2.0% of nighttime sleep. Episodes of REM sleep lasted on average 10±1 sec and ranged between 4 and 40 sec. Therefore, the total amount and duration of REM sleep episodes in ostrich chicks were substantially smaller than reported in adult ostriches while the amounts of NREM sleep did not greatly differ. The profile of REM sleep ontogenesis in the ostrich may be remarkably different from what has been reported in all studied mammals and birds.
Oleg I Lyamin - One of the best experts on this subject based on the ideXlab platform.
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sleep in ostrich chicks Struthio camelus
Sleep, 2021Co-Authors: Oleg I Lyamin, Anton S Kibalnikov, Jerome M SiegelAbstract:It has been reported that adult ostriches displayed the longest episodes of rapid eye movement (REM) sleep (up to 5 min) and more REM sleep (24% of the nighttime) than any other bird species. If the mammalian ontogenetic trend exists in the ostrich, then the amounts of REM and the duration of sleep episodes in young ostriches may be greater than those reported in adults. We investigated sleep in 1.5-3.5 month old ostrich chicks. Recordings were conducted during nighttime (20:00-08:00), the main sleep period in ostriches, which are diurnal. The polygrams were scored in 4-s epochs for waking, non-rapid eye movement (NREM) sleep and REM sleep, as in other bird studies. REM sleep in ostrich chicks occurred during both cortical EEG activation and during slow waves, as was described in adult ostriches. The chicks spent 69.3% ± 1.5% of the night in NREM sleep. REM sleep occupied 14.1% ± 1.8% of the night or 16.8% ± 2.0% of nighttime sleep. Episodes of REM sleep lasted on average 10 ± 1 s and ranged between 4 and 40 s. Therefore, the total amount and duration of REM sleep episodes in ostrich chicks were substantially smaller than reported in adult ostriches while the amounts of NREM sleep did not greatly differ. The developmental profile of REM sleep ontogenesis in the ostrich may be remarkably different from what has been reported in all studied mammals and birds.
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sleep in ostrich chicks Struthio camelus
Sleep, 2020Co-Authors: Oleg I Lyamin, Anton S Kibalnikov, Jerome M SiegelAbstract:It has been reported that adult ostriches displayed the longest episodes of REM sleep (up to 5 min) and more REM sleep (24% of the nighttime) than any other bird species. If the mammalian ontogenetic trend exists in the ostrich, then the amounts of REM and the duration of sleep episodes in young ostriches may be greater than those reported in adults. We investigated sleep in 1.5-3.5 month old ostrich chicks. Recordings were conducted during nighttime (20:00-08:00), the main sleep period in ostriches, which are diurnal. The polygrams were scored in 4-sec epochs for waking, NREM (non-rapid eye movement) sleep and REM sleep, as in other bird studies. REM sleep in ostrich chicks occurred during both cortical EEG activation and during slow waves, as was described in adult ostriches. The chicks spent 69.3±1.5 of the night in NREM sleep. REM sleep occupied 14.1±1.8% of the night or 16.8±2.0% of nighttime sleep. Episodes of REM sleep lasted on average 10±1 sec and ranged between 4 and 40 sec. Therefore, the total amount and duration of REM sleep episodes in ostrich chicks were substantially smaller than reported in adult ostriches while the amounts of NREM sleep did not greatly differ. The profile of REM sleep ontogenesis in the ostrich may be remarkably different from what has been reported in all studied mammals and birds.
Pierre Jolles - One of the best experts on this subject based on the ideXlab platform.
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complete amino acid sequence of ostrich Struthio camelus egg white lysozyme a goose type lysozyme
FEBS Journal, 2005Co-Authors: Francoise Schoentgen, J Jolles, Pierre JollesAbstract:The complete amino acid sequence (185 amino acid residues) of the good-type lysozyme from the egg white of ostrich (Struthio camelus) has been determined from the study of tryptic and Staphylococcus aureus V8 protease peptides as well as of CNBr and BNPS-skatole fragments. A slight sequence homology between the goose-type and chicken-type lysozymes has been observed.
Izzat Iqbal Cheema - One of the best experts on this subject based on the ideXlab platform.
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sustainable biodiesel production from waste cooking oil utilizing waste ostrich Struthio camelus bones derived heterogeneous catalyst
Fuel, 2020Co-Authors: Haris Mahmood Khan, Tanveer Iqbal, Chaudhry Haider Ali, Ansar Javaid, Izzat Iqbal CheemaAbstract:Abstract The present work espouses a zero-waste approach for relying on indigenous waste resources to deliver green and sustainable biofuel. This investigation reports biodiesel production from waste cooking oils (WCO) via cheap heterogeneous catalyst obtained from waste Ostrich (Struthio camelus) bones for the first-time. The synthesized catalyst was characterized by Thermogravimetric analysis/differential scanning calorimetry (TGA/DSC), X-ray diffraction (XRD), Fourier-transform infrared spectroscopy (FTIR), Scanning electron microscopy (SEM), Energy dispersive X-ray spectroscopy (EDX), X-ray fluorescence (XRF), Hammett indicator method and surface area calculations. The powdered ostrich bones were calcined at different temperatures, ranging from 600 to 1000 °C. Upon temperature rise, sharp peaks of hydroxyapatite (HAp) appeared as observed by XRD. The reaction parameters have been optimized in presence of the synthesized catalyst to maximize biodiesel yield. The optimum biodiesel yield of 90.56% was attained at methanol/oil ratio 15/1, process temperature 60 °C, catalyst loading 5 wt% within reaction duration of 4 h. It concludes that hydroxyapatite (HAp) derived from ostrich bones showed good catalytic performance to produce biodiesel from WCO. The synthesized catalyst sustained adequate catalytic activity even after being repeatedly recycled four times, which infers low-cost biodiesel production opportunities. Furthermore, an integrated waste oil/bone collection approach is recommended for the effective utilization of indigenous waste to produce biodiesel.
