排序方式： 共有21条查询结果，搜索用时 62 毫秒
1.
Anwar Noman Jiang Qixing Yanshun Xu Abdelmoneim H. Ali Wedad Q. Al-Bukhaiti Sherif M. Abed 《Journal Of Aquatic Food Product Technology》2019,28(6):583-597
Protein hydrolysates from Chinese sturgeon were prepared using Alcalase 2.4L enzyme. Under the optimum conditions (enzyme–substrate ratio of 3.5%, pH of 8.5, and temperature of 55°C), the degree of hydrolysis (DH) was 13.8%, 16.7%, and 19.1% after 1, 3, and 6 h, respectively. The contents of crude protein and amino acid increased at DH of 19.1% to 86.97% and 78.29%, respectively. There was an obvious increase in the low-molecular-weight peptides, which could enhance the hydrolysate’s functional properties such as solubility, representing more than 90% at different pH levels. The obtained protein hydrolysates revealed good emulsification properties and high oil absorption. Furthermore, good antioxidant activities such as 1, 1-diphenyl-2-picrylhydrazyl (DPPH) inhibition, ferric reducing power, and ferrous ion (Fe2+) chelating ability were attained depending on the solution concentration. The findings indicate that the functional and antioxidant properties of protein hydrolysates could be useful in many applications of the food industry. 相似文献
2.
Effects of egg aging on the metabolites of ovarian fluid in rainbow trout,Oncorhynchus mykiss 
下载免费PDF全文
下载免费PDF全文 Saeed Hajirezaee Hossein Khara Amirreza Abed‐Elmdoust Ahmad Rafieepour Ruhollah Rahimi 《Aquaculture Research》2018,49(1):104-110
Nuclear magnetic resonance ‐based metabolomics was applied to study effects of egg aging on ovarian fluid metabolites in rainbow trout, Oncorhynchus mykiss. The eggs of three females were pooled and then assigned to three plastic vials for 18 days in vitro storage at 4°C. Ovarian fluid samples were taken 0, 6, 12 and 18 days after storage. Three groups of metabolites including amino acids, osmolytes and energy metabolites were found to change during storage period. The glucose levels of ovarian fluid showed significant decreases on days 12 and 18 after storage (p < .05). For acetoacetate and acetate, significant increases were observed, respectively, on days 12 and 18 after storage (p < .05). The creatine levels of ovarian fluid increased significantly on days 12 and 18 after storage (p < .05). Lactate levels in ovarian fluid elevated during storage period (p < .05). Glycerol levels showed a significant increase on days 12 and 18 after storage (p < .05). The values of osmolytes in ovarian fluid (e.g., betaine, taurine, trimethylamine‐N‐oxide, N,N‐dimethylglycine) showed a decreasing trend on day 12 which continued until the end of storage on day 18 (p < .05). Almost all amino acids elevated on days 12 and 18 after storage (p < .05). After an apparent elevation in isoleucine levels on days 6 and 12, this amino acid decreased on day 18 after storage (p < .05). The osmolytes might act as antioxidant against free‐radicals produced as a result of over‐ripening. Glucose can be used as energy resource for eggs and bacteria during ova storage. Also, change pattern of amino acids indicate hydrolysis of proteins as the time of storage increases. 相似文献
3.
Abed C Legrave N Dufies M Robert G Guérineau V Vacelet J Auberger P Amade P Mehiri M 《Marine drugs》2011,9(7):1210-1219
Chemical investigation of the Mediterranean sponge Sarcotragus spinosulus led to the isolation of a new hydroxylated nonaprenylhydroquinone, along with two known metabolites, hepta- and octaprenylhydroquinones. The structure of the new metabolite was assigned by extensive 1D and 2D NMR analyses and MS studies. The antileukemic effect of the three compounds towards the chronic myelogenous leukemia (CML) cells line K562 was also evaluated. 相似文献
4.
Abed Janoudi 《The Journal of Horticultural Science and Biotechnology》2013,88(6):793-797
SummaryMultiple applications of methyl jasmonate (Me-J), at 10.mM, enhanced the rate of fruit ripening in peach ‘Redhaven’. The effect of Me-J on red colour development and fruit firmness was most pronounced in fruit treated six times with Me-J. Lower concentrations of Me-J had no effect of fruit colour. Me-J, at 10.mM, significantly reduced stomatal conductance, photosynthetic rate and transpiration rate of crabapple leaves, but had no effect on these parameters in peach leaves. The short-term inhibitory effects of Me-J on leaf gas exchange in crabapple persisted for up to 24 h. Fourteen applications of Me-J over a period of 28 days resulted in a 60% decrease in the concentration of chlorophyll in leaves. These Me-J applications also reduced the length of new branches, leaf number and leaf fresh weight by 65%, 31% and 47%, respectively. In peach, Me-J induced some leaf chlorosis and early leaf senescence within two weeks of the treatments which resulted in significant reductions in shoot length. 相似文献
5.
Hatchery culture of mud crabs has not yet achieved commercial viability despite decades of research efforts. Further research is therefore needed to better understand larval culture requirements of the crab. Based on anecdotal observations, an experiment was carried out to test whether the background colour of the culture vessel affected larval culture success. Newly hatched larvae of Scylla serrata were reared in culture vessels of five colours, i.e., black, dark green, maroon, sky blue and white. Larval survival and development were monitored daily until all of them either moulted to the first crab stage or died. The results showed clear effects of background colour on larval survival. A general tendency of higher larval survival in darker‐coloured backgrounds was evident. In particular, overall zoeal survival for larvae reared in black vessels was significantly higher than those reared in white ones. Background colour also appeared to affect larval development. Larvae reared in darker backgrounds generally had shorter development times and more synchronized moulting. A significant delay in zoeal development was observed in larvae reared in white vessels. Dark backgrounds possibly facilitated more efficient feeding, reduced settlement of larvae at the bottom of the vessels as well as minimized stress. This result appears to be the first to demonstrate that background colour can significantly affect larval survival and development of a crustacean species. 相似文献
6.
A. F. Abdel-Fattah N. M. Abed M. Edrees 《Plant foods for human nutrition (Dordrecht, Netherlands)》1973,22(2):171-179
The constituents of the red seaweedLaurencia papillosa were investigated in different seasons. Protein and galactan comprised the major components of the algal material. Acid hydrolysis of the alga afforded galactose, glucose, xylose, ribose and glucuronic acid. The alga was shown to contain cholesterol, -sitosterol and lanosterol. Free amino acids as well as the amino acid composition of the isolated proteins were also investigated. The algal components showed different seasonal variations.
Zusammenfassung Der rote SeetangLaurencia papillosa wurde zu verschiedenen Jahreszeiten auf seine Bestandteile hin untersucht. Protein und Galactan bilden die Hauptbestandteile des Algenmaterials. Säurehydrolyse der Alge ergibt Galactose, Glucose, Xylose, Ribose und Glucuronsäure. Die Alge enthält ferner Cholesterol, -Sitosterol und Lanosterol. Die freien Aminosäuren wurden ebenso untersucht wie die Aminosäuren-Zusammensetzung der isolierten Proteine. Die Bestandteile der Alge zeigten unterschiedliche jahreszeitliche Schwankungen.
Résumé Les constituants du rouge algueLaurencia papillosa ont été examinés dans les differentes saisons. Protéines et galactane ont composé la majorité des contenants du materiel algual. L'acide hydrolysé d'algue a offré galactose, glucose, xylose, ribose et glucuronique acide. L'algue a été paru comprendre cholesterol, -sitosterol et lanosterol. Les libres amino acides comme l'amino acid composition du protéine isolé ont été encore examinés. Les contenants alguales ont manifesté des differentes variations saisonales.相似文献
7.
OBJECTIVE: To evaluate the effect of focused extracorporeal shock wave therapy (ESWT) and radial pressure wave therapy (RPWT) on immunohistochemical staining for substance P and calcitonin gene-related peptide (CGRP) in the skin and periosteum of sheep. ANIMALS: 36 sheep. PROCEDURES: All 4 limbs of 36 sheep were treated with ESWT, RPWT, or a sham treatment. For 14 days after treatment, at least 2 sheep were euthanized daily and tissue was harvested for histologic evaluation of nerves via staining for substance P and CGRP in the skin and periosteum. RESULTS: No effects of ESWT or RPWT were observed on the number of nerves with stain uptake for substance P or CGRP in the skin or periosteum. CONCLUSIONS AND CLINICAL RELEVANCE: Substance P- and CGRP-containing nerve fibers are not disrupted by EWST or RPWT. Further studies are needed to identify the mechanism of analgesia observed in association with these treatment modalities. 相似文献
8.
Ahmed Abed Gatea AL-SHAMMARY Abbas Z. KOUZANI Akif KAYNAK Sui Yang KHOO Michael NORTON Will GATES 《土壤圈》2018,28(4):581-596
Measurement of soil bulk density is important for understanding the physical, chemical, and biological properties of soil. Accurate and rapid soil bulk density measurement techniques play a significant role in agricultural experimental research. This review is a comprehensive summary of existing measurement methods and evaluates their advantages, disadvantages, potential sources of error, and directions for future development. These techniques can be broadly categorised as direct and indirect methods. Direct methods include core, clod, and excavation sampling, whereas indirect methods include the radiation and regression approaches. The core method is most widely used, but it is time consuming and difficult to use for sampling multiple soil depths. The size of the coring cylinder used, operator experience, sampling depth, and in-situ soil moisture content significantly affect its accuracy. The clod method is suitable for use with heavy clay soils, and its accuracy is dependent on equipment calibration, drying time, and operator experience, but the process is complicated and time consuming. Excavation techniques are most commonly used to evaluate the bulk density of forest soils, but have major limitations as they cannot be used in soils with large pores and their measurement accuracy is strongly influenced by soil texture and the type of analysis selected. The indirect methods appear to have greater accuracy than direct approaches, but have higher costs, are more complex, and require greater operator experience. One such approach uses gamma radiation, and its accuracy is strongly influenced by soil depth. Regression methods are economical as they can make indirect measurements, but these depend on good, quality data of soil texture and organic matter content and geographical and climatic properties. Also, like most of the other approaches, its accuracy decreases with sampling depth. 相似文献
9.
Irrigation water reduction using System of Rice Intensification compared with conventional cultivation methods in Iraq 总被引：1，自引：1，他引：0
Khidhir Abbas Hameed Abdul-Kadhim Jawad Mosa Flayeh Abed Jaber 《Paddy and Water Environment》2011,9(1):121-127
A field study was conducted at Al-Mishkhab Rice Research Station (MRRS) during the summer season 2009 to evaluate irrigation
water use efficiency (IWUE) using Anbar 33 variety with the System of Rice Intensification compared to traditional methods.
During the growth phase, the number of leaves, stems, and roots, and the average plant height were measured every 15 days
for the two sets of methods. At maturity, the depth and length of plant roots was assessed, along with leaf area index (LAI)
of the flag leaf and plant height. The amount of irrigation water applied was measured by water meter for both methods. SRI
principles for plant age, spacing, etc., were implemented in the SRI plots. The results indicated more vigorous growth of
roots under SRI methods, reaching 13,004 cm plant−1 compared with non-SRI results of 4,722 cm plant−1. There was 42% increase in grain yield when SRI methods were used. These had water use efficiency (WUE) of 0.291 kg m−2 compared with WUE of 0.108 kg m−2 for non-SRI cultivation, almost a threefold difference. SRI practices reduced the need for irrigation water by 38.5%. 相似文献
10.
Improvement in wild endangered Persian sturgeon,Acipenser persicus (Borodin, 1897) semen cryopreservation by 2‐hydroxypropyl‐beta‐cyclodextrin (HβCD) 下载免费PDF全文
下载免费PDF全文 Ruhollah Rahimi Hamid Farahmand Alireza Mirvaghefi Gholamreza Rafiee Amirreza Abed Elmdoust 《Aquaculture Research》2015,46(10):2452-2456
In this study, cryopreservation feasibility of Persian sturgeon (Acipenser persicus) and the effect of different doses of 2‐hydroxypropyl‐beta‐cyclodextrin on thawed spermatozoa quality (motility duration and motility percentage) were investigated. For freezing, semen of seven male individuals was pooled in equal volumes and diluted with 4°C [Tris‐HCl (100 mM), pH = 8, DMSO 10%] extenders containing 0, 5, 10, 15 mM of HβCD in a ratio of 1:1(semen/extenders). Then semen was filled into 0.5‐mL straws, and was frozen with vapour of liquid nitrogen at 4‐cm above surface of liquid nitrogen. After 3 min, straws were plunged in to liquid nitrogen. Thawing was performed at 40°C water baths for 15 s. Motility duration of the 10 mM HβCD treated spermatozoa at days 14 (228.98 ± 16.39) and 56 (199.66 ±21.78) were longer than other treatments. In day 56, the motility percentage in treatment with 10 mM was significantly higher (16.14 ± 2.54) (P < 0.05) compared with 5 mM treatment (8.75 ± 2.47) (P < 0.05). Therefore, it is recommended that 10 mM of HβCD can be used as an additive cryoprotectant for increasing cryopreserved spermatozoa quality in this species. 相似文献