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Age and Growth of Epinephelus fasciatus from northern Red Sea 红海北部斑石斑鱼的年龄和生长
IF 0.3 Q4 ENVIRONMENTAL SCIENCES Pub Date : 2019-03-01 DOI: 10.12816/CAT.2019.28620
Mohammed Abozeid, Ashraf Ahmed, M. Alwany, M. El-Sherbiny, Belal Saleh
Age and Growth of the fish Epinephelus fasciatus (n=443) from Northern Red Sea were investigated, during the period from June 2006 to May 2007. The t-test analysis for the length-weight relationships showed a significant difference between b values, where male are positive allometric while female and sexes combined are isometric. The "Kc" and (Kn) factor was studied monthly and according to size classes, where females usually outnumbered males. The total average of Kc for sexes combined was 1.428 (SE.± 0.4134), this value is indication of a good condition. The value for both Kc and Kn increased in line with increased fish size until the size 31.4, and then decreased in value. On the other hand, both condition factors showed fluctuations among months, where the lowest value was recorded during August (within spawning season). The back calculation method was used to determine the age and growth for E. fasciatus. According to Bhattacharya method eight age group were verified growth parameters L∞=36.75 cm (TL), K= 0.35 year -1 and t0= -0.41121 were derived from Ford and Walford method. The highest range of growth recorded in the first year as it grows about 14.32 cm. Then the rate of growth either slowed down slightly or get closer to being steady.
本文于2006年6月至2007年5月对北红海地区443条石斑鱼(Epinephelus fasciatus)的年龄和生长进行了调查。长度-重量关系的t检验分析显示,b值之间存在显著差异,其中男性为正异速生长,而女性和性别组合为等速生长。“Kc”和(Kn)因子按月研究,并根据体型分类,雌性通常多于雄性。两性合计Kc总平均值为1.428 (SE)。±0.4134),该值表明状况良好。Kc和Kn值均随鱼体尺寸的增大而增大,直至鱼体尺寸为31.4时均呈下降趋势。另一方面,这两个条件因子在月份之间表现出波动,其中8月份(产卵季节)的值最低。采用反算法测定筋膜棘鱼的年龄和生长情况。根据Bhattacharya法验证8个年龄组的生长参数L∞=36.75 cm (TL), K= 0.35 year -1和t0= -0.41121由Ford和Walford法得到。最高的生长范围记录在第一年,因为它生长约14.32厘米。然后,增长率要么略微放缓,要么接近稳定。
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引用次数: 2
Biodegradation of Some Petroleum Hydrocarbons by Fungi Isolated from Gulf of Suez 苏伊士湾分离真菌降解石油烃类的研究
IF 0.3 Q4 ENVIRONMENTAL SCIENCES Pub Date : 2019-03-01 DOI: 10.12816/CAT.2019.28632
Metwally R. Kottb, Nadia El-Agroudy, A. Ali, M. Hamed, Heba M. Ezz El-Din
Petroleum hydrocarbons are one of the main pollutants which affected directly on the Gulf of Suez environment due to petroleum products deliveries and production as well as fuel combustion emissions from shipping activities and refineries. There are several Methods for treatment of hydrocarbons such as physical, mechanical, chemical and biological methods. Broth media containing ACF (accommodated fraction), WSF (water soluble fractions) or anthracene were used separately as a sole carbon source. 17 fungal species were isolated from water and sediment of three selected stations (Port-Tawfik, El-Ziaytia and Attaka), then screened in each substrate. Capillary gas chromatography (CGC) analysis used to chemically profiling each substrate after inoculation. Our results showed that, Aspergillus flavus was the most effective of degradation ACF reach to (98.79 %). In case of WSF the isolate Penicillium chrysogenium was the highest percentage of degradation (98.53 %). Anthracene degradation after 2 weeks recorded (56.08 %) by using Cladosporium sp. In conclusion, the Gulf of Suez contain several promising fungal species that could be used in biodegradation of petroleum hydrocarbons as a save alternatives in marine ecosystem.
石油碳氢化合物是直接影响苏伊士湾环境的主要污染物之一,因为石油产品的运输和生产以及航运活动和炼油厂的燃料燃烧排放。碳氢化合物的处理方法有几种,如物理、机械、化学和生物方法。分别使用含有ACF(可调节组分)、WSF(水溶性组分)或蒽的肉汤培养基作为唯一的碳源。从三个站点(Port-Tawfik, El-Ziaytia和Attaka)的水和沉积物中分离出17种真菌,然后在每种基质中进行筛选。毛细管气相色谱(CGC)分析用于接种后每种底物的化学分析。结果表明,黄曲霉对ACF的降解效率最高,达98.79%。在WSF中,青霉菌的降解率最高(98.53%)。Cladosporium sp. 2周后对蒽的降解率为56.08%。由此可见,苏伊西湾存在几种有潜力的真菌,可作为海洋生态系统中石油烃类生物降解的替代菌。
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引用次数: 6
Strawberry Plug Transplant Production in Trays: The Influence of Genotype, Initial Ramet Size and Substrate 草莓盘插生产:基因型、初始分株大小和基质的影响
IF 0.3 Q4 ENVIRONMENTAL SCIENCES Pub Date : 2019-03-01 DOI: 10.12816/CAT.2019.28607
F. Mohamed, M. Elwan, K. El-Hamed, M. Abdel-Salam, A. A. El-Deeb
The present study was conducted during the period 2014-2016 at the greenhouse facilities of the Department of Horticulture, Faculty of Agriculture, Suez Canal University.The experiment tested the effects of growing three daughter plants (ramets) sizes based on crown diameter (large > 7 mm, medium 5-7 mm and small < 5 mm) in combination with three medium types (M1, coco peat + vermiculite + perlite; M2, coco peat + rice hull + sawdust; M3, coco peat + rice hull + rice straw in 1:1:1 v/v) on plug transplant growth in container (84-cell foam trays) of three strawberry cultivars. Results of the main effect of the initial ramet size indicated positive effects of large ramet on obtaining better plug plant vegetative and rooting characteristics than medium or small size ramets. Results of the main effect of medium types showed that both M1 and M2 produced plug plants with better leaf petiole length, leaf fresh weight (FW) and Dry weight (DW) and crown diameter than M3, but root dry mass was not affected by medium types. Plug transplant grown on M3 had better contents of chlorophyll and carotenoids in their leaves than those on M1 or M2. Nutrient analysis of plug plant leaves indicated that plug plants grown on M1 had more P, K, Fe and Cu, and those on M2 had more N, Ca and Mn, while plug plants derived from M3 had more Mg and Zn. Results also indicated that plug transplants were not different in some vegetative and rooting characters among the different strawberry cultivars, especially in number of leaves per transplant, leaves FW and DW, crown DW and root DW, while root length was better in transplants of cv. 'Festival' than 'Tudla' and 'Sweet Charlie'. Leaves of plug plants in cv. 'Tudla' recorded higher chlorophyll and carotenoids than 'Festival' and 'Sweet Charlie' and also had more N, P, and K contents. Generally results indicated that optimum plug transplant production and growth was obtained by the culture of large size ramets in trays filled with any of the tested medium types and cultivars. These results indicated the possibility of producing large number of strawberry plug transplants in Egypt using soilless, suspended growing system as alternative to their production in field nursery to avoid the hazardous effects of soil fumigation and pesticide use.
本研究于2014-2016年期间在苏伊士运河大学农学院园艺系的温室设施进行。本试验测试了3种培养基类型(M1、椰泥炭+蛭石+珍珠岩)结合种植按冠径大小(大> 7 mm、中5 ~ 7 mm、小< 5 mm) 3种子代植株(株)的效果;M2,椰泥炭+稻壳+锯末;M3,椰泥+稻壳+稻秆按1:1:1 v/v配比)对3个草莓品种的容器(84孔泡沫托盘)插拔生长的影响。结果表明,与中、小分株相比,大分株在获得更好的栓系植物营养和生根特性方面具有积极作用。培养基类型的主效应结果表明,M1和M2均比M3具有更好的叶柄长、叶鲜重、叶干重和冠径,但根系干质量不受培养基类型的影响。M3扦插苗叶片叶绿素和类胡萝卜素含量高于M1和M2扦插苗。对栓皮植物叶片养分分析表明,M1上生长的栓皮植物含有较多的P、K、Fe和Cu, M2上生长的栓皮植物含有较多的N、Ca和Mn, M3上生长的栓皮植物含有较多的Mg和Zn。结果还表明,不同草莓品种间插拔移栽在部分营养和生根性状上无显著差异,特别是在单叶数、叶片FW和DW、冠DW和根DW方面,而cv移栽的根长较好。'Festival'比'Tudla'和'Sweet Charlie'更重要。cv中栓塞植物的叶片。‘Tudla’的叶绿素和类胡萝卜素含量高于‘Festival’和‘Sweet Charlie’,而且氮、磷和钾含量也更高。一般结果表明,在装有任何一种试验培养基和栽培品种的托盘中培养大规格秧,可获得最佳的插秧产量和生长。这些结果表明,在埃及,采用无土悬生系统生产草莓块茎移栽是可能的,可以替代田间苗圃生产,避免土壤熏蒸和农药使用的有害影响。
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引用次数: 1
Human Health Risk via Cadmium Concentration in Different Tissues of Domesticated Japanese Quail (Coturnix japonica) and Wild Common Quail (Coturnix coturnix) 家养日本鹌鹑和野生鹌鹑不同组织中镉浓度对人类健康的危害
IF 0.3 Q4 ENVIRONMENTAL SCIENCES Pub Date : 2019-03-01 DOI: 10.12816/CAT.2019.28601
Basma M. Sheta, H. El-Hamid, M. El-Alfy
Quail hunting is a major socioeconomic practice in Egyptian coastal areas. The accumulation of cadmium in feathers (chest and tail), muscle, kidneys and livers were analyzed and compared in both wild migratory and domesticated Japanese quails using atomic absorption spectrophotometry. Domesticated Japanese quail recorded higher concentrations of cadmium than the wild one. Cadmium concentration was higher in kidneys and livers than that in the pectoral muscle and feathers. To assess potential risk to human health, daily intake (EDI) and target hazard quotient (THQ) were calculated. The EDI in all tissues was within the permissible tolerable daily intake (PTDI) limit except for kidney values in domesticated species. THQ of all tested organs was less than one, indicating that harmful impacts are not expected. People should avoid eating kidneys and livers of quail in their diets but can safely feed on muscles as they accumulate low percentage of the toxic cadmium.
鹌鹑狩猎是埃及沿海地区主要的社会经济活动。采用原子吸收分光光度法对野生迁徙鹌鹑和家养鹌鹑的羽毛(胸部和尾部)、肌肉、肾脏和肝脏中镉的积累进行了分析和比较。家养日本鹌鹑的镉含量高于野生鹌鹑。肾脏和肝脏的镉浓度高于胸肌和羽毛。为了评估对人类健康的潜在风险,计算了每日摄入量(EDI)和目标危害商(THQ)。除了驯化物种的肾脏值外,所有组织中的EDI都在允许耐受日摄入量(PTDI)限制范围内。所有被测器官的THQ值均小于1,表明预计不会产生有害影响。人们应该避免在饮食中食用鹌鹑的肾脏和肝脏,但可以安全地食用肌肉,因为它们积累的有毒镉的百分比很低。
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引用次数: 2
Green Inhibitor as Antibacteria and Antiscaling in Reverse Osmosis Desalination Plants 绿色缓蚀剂在反渗透海水淡化厂中的抗菌和防垢作用
IF 0.3 Q4 ENVIRONMENTAL SCIENCES Pub Date : 2019-03-01 DOI: 10.12816/CAT.2019.28631
S. Hamdona, A. El-Aassar, H. A. Ibrahim, A. Ahmed
Today, reverse osmosis membranes are the leading technology for new desalination installations, however, a challenge facing widespread application of RO technology is membrane fouling. In the present study, we used an environmentally friendly green inhibitor as anti-scaling and anti-biofouling in reverse osmosis (RO) desalination plants. The influence of Sargassum sp., Corallina mediterranea, and Avicennia marina on RO membrane mineral scaling was evaluated using gypsum as a model scalant. Antibacterial properties for three marine extracts from Sargassum sp., C. mediterranea, and Avicennia marina were investigated with Gram-positive bacteria (ArthrobactersulfureusYACS14, Staphylococcus aureus) and Gram-negative bacteria (VibrioanguillarumMVM425, Escherichia coli). The antimicrobial results were detected for the two selected extracts as the most potent extracts (ethyl acetate, methanol crude extracts of the Avicennia marina leaves). Data showed that ratios of 3 and 5% recorded the highest suppression percentages (100%) for all tested bacteria including bacterial community collected from Eastern Harbor. On the other side, data confirmed that the anti-scalant properties by 100 ppm of Avicennia marina leave extract giving 85% of scale inhibition. The effect of Avicennia marina leaves extract for calcium sulfate dihydrate (gypsum) scaling on selected reverse osmosis (RO) membrane surfaces was investigated. The effect of different concentrations of Avicennia marina leaves extract was observed in the extent of surface scale coverage and surface crystal size among the membrane studied.
如今,反渗透膜是新海水淡化装置的主导技术,然而,反渗透技术广泛应用面临的挑战是膜污染。在本研究中,我们将一种环保型绿色缓蚀剂用于反渗透(RO)海水淡化厂的防结垢和防生物污染。以石膏为模型结垢剂,研究了马尾藻、地中海珊瑚和海葵对反渗透膜矿物结垢的影响。采用革兰氏阳性菌(ArthrobactersulfureusYACS14、金黄色葡萄球菌)和革兰氏阴性菌(VibrioanguillarumMVM425、大肠杆菌)对马尾藻(Sargassum sp.)、地中海马尾藻(C. mediterranea)和海葵(Avicennia marina) 3种海洋植物提取物进行抑菌试验。筛选出两种最有效的提取物(醋酸乙酯、甲醇粗提物)进行抑菌效果检测。数据显示,3和5%的比例对所有测试细菌(包括从东港收集的细菌群落)的抑制率最高(100%)。另一方面,数据证实了100 ppm的海棠叶提取物的阻垢性能,阻垢率为85%。研究了水合硫酸钙(石膏)结垢用海葵叶提取物对反渗透膜表面的影响。观察了不同浓度的海槐叶提取物对所研究膜间表面鳞片覆盖程度和表面晶粒大小的影响。
{"title":"Green Inhibitor as Antibacteria and Antiscaling in Reverse Osmosis Desalination Plants","authors":"S. Hamdona, A. El-Aassar, H. A. Ibrahim, A. Ahmed","doi":"10.12816/CAT.2019.28631","DOIUrl":"https://doi.org/10.12816/CAT.2019.28631","url":null,"abstract":"Today, reverse osmosis membranes are the leading technology for new desalination installations, however, a challenge facing widespread application of RO technology is membrane fouling. In the present study, we used an environmentally friendly green inhibitor as anti-scaling and anti-biofouling in reverse osmosis (RO) desalination plants. The influence of Sargassum sp., Corallina mediterranea, and Avicennia marina on RO membrane mineral scaling was evaluated using gypsum as a model scalant. Antibacterial properties for three marine extracts from Sargassum sp., C. mediterranea, and Avicennia marina were investigated with Gram-positive bacteria (ArthrobactersulfureusYACS14, Staphylococcus aureus) and Gram-negative bacteria (VibrioanguillarumMVM425, Escherichia coli). The antimicrobial results were detected for the two selected extracts as the most potent extracts (ethyl acetate, methanol crude extracts of the Avicennia marina leaves). Data showed that ratios of 3 and 5% recorded the highest suppression percentages (100%) for all tested bacteria including bacterial community collected from Eastern Harbor. On the other side, data confirmed that the anti-scalant properties by 100 ppm of Avicennia marina leave extract giving 85% of scale inhibition. The effect of Avicennia marina leaves extract for calcium sulfate dihydrate (gypsum) scaling on selected reverse osmosis (RO) membrane surfaces was investigated. The effect of different concentrations of Avicennia marina leaves extract was observed in the extent of surface scale coverage and surface crystal size among the membrane studied.","PeriodicalId":42145,"journal":{"name":"Catrina-The International Journal of Environmental Sciences","volume":"21 1","pages":""},"PeriodicalIF":0.3,"publicationDate":"2019-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82134071","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 4
Immobilization of Cellulases Produced by Penicillium brevicompactum AUMC 10987, using Cross-Linkage, Chitosan-Coating and Encapsulation 短压缩青霉AUMC 10987产纤维素酶的交联、壳聚糖包衣和包封固定化研究
IF 0.3 Q4 ENVIRONMENTAL SCIENCES Pub Date : 2019-03-01 DOI: 10.12816/CAT.2019.28624
Mohamed Abdel-Sater, N. Hussein, Nashwa A. H. Fetyan, S. Gad
This study was designed to optimize different conditions for improving enzyme production by Penicillium brevicompactum AUMC 10987, and to precipitate and immobilize cellulases by cross-linking method using glutaraldehyde, magnetic nanocarriers and encapsulation using Ca-alginate. Maximum activity of cellulase was achieved in medium containing date palm leaves, sodium nitrate, after 9 days incubation at 30°C and pH 6. Solid state fermentation was more convenient method in cellulase production. After ammonium sulphate precipitation, enzyme activities exceeded two-folded, constructing more stability for the enzyme structure and giving maximum activities at 50℃ and pH 4.8. Hence, precipitated enzyme could work in higher temperature and acidity conditions. The immobilization of cellulases by encapsulation was the most valuable technique retaining the activity of enzyme. Moreover, the immobilized enzyme remained active up to 80°C, giving its maximum activity at 50°C and pH 5.5. Enzyme encapsulated within alginate beads is preferred due to easy for formulation, mild gelation conditions, non-toxic, biocompatibility, low cost and resistance to microbial attack. Magnetic nannocariers immobilized enzyme had opportunity to be reused after 4 cycles/16 hours. The current study could provide a robust and highly valuable immobilized enzyme for different industrial and biotechnological applications.
本研究旨在优化短压缩青霉AUMC 10987产酶的不同条件,并采用戊二醛交联法、磁性纳米载体和海藻酸钙包封法对纤维素酶进行沉淀和固定化。在含有椰枣叶和硝酸钠的培养基中,在30°C和pH 6条件下培养9天后,纤维素酶活性达到最高。固体发酵法是生产纤维素酶较为简便的方法。硫酸铵沉淀后,酶活性超过两折叠,酶结构更加稳定,在50℃、pH 4.8条件下酶活性最高。因此,沉淀酶可以在更高的温度和酸度条件下工作。包封法固定化纤维素酶是目前最有价值的保持酶活性的技术。此外,固定化酶在80°C下保持活性,在50°C和pH 5.5下活性最高。酶封装在海藻酸酯珠内是首选的,因为易于配方,温和的凝胶条件,无毒,生物相容性,低成本和抗微生物攻击。磁性纳米载体固定化酶在4次循环/16小时后有机会重复使用。本研究为不同的工业和生物技术应用提供了一种稳定、高价值的固定化酶。
{"title":"Immobilization of Cellulases Produced by Penicillium brevicompactum AUMC 10987, using Cross-Linkage, Chitosan-Coating and Encapsulation","authors":"Mohamed Abdel-Sater, N. Hussein, Nashwa A. H. Fetyan, S. Gad","doi":"10.12816/CAT.2019.28624","DOIUrl":"https://doi.org/10.12816/CAT.2019.28624","url":null,"abstract":"This study was designed to optimize different conditions for improving enzyme production by Penicillium brevicompactum AUMC 10987, and to precipitate and immobilize cellulases by cross-linking method using glutaraldehyde, magnetic nanocarriers and encapsulation using Ca-alginate. Maximum activity of cellulase was achieved in medium containing date palm leaves, sodium nitrate, after 9 days incubation at 30°C and pH 6. Solid state fermentation was more convenient method in cellulase production. After ammonium sulphate precipitation, enzyme activities exceeded two-folded, constructing more stability for the enzyme structure and giving maximum activities at 50℃ and pH 4.8. Hence, precipitated enzyme could work in higher temperature and acidity conditions. The immobilization of cellulases by encapsulation was the most valuable technique retaining the activity of enzyme. Moreover, the immobilized enzyme remained active up to 80°C, giving its maximum activity at 50°C and pH 5.5. Enzyme encapsulated within alginate beads is preferred due to easy for formulation, mild gelation conditions, non-toxic, biocompatibility, low cost and resistance to microbial attack. Magnetic nannocariers immobilized enzyme had opportunity to be reused after 4 cycles/16 hours. The current study could provide a robust and highly valuable immobilized enzyme for different industrial and biotechnological applications.","PeriodicalId":42145,"journal":{"name":"Catrina-The International Journal of Environmental Sciences","volume":"370 1","pages":""},"PeriodicalIF":0.3,"publicationDate":"2019-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"91123331","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 5
Ameliorating Effect of Silicon on Growth Vigor, Physiological and biochemical Traits of Salinized Canola Seedlings (Brassica napus L.) 硅对盐渍油菜幼苗生长活力及生理生化性状的改善作用
IF 0.3 Q4 ENVIRONMENTAL SCIENCES Pub Date : 2019-03-01 DOI: 10.12816/cat.2019.28622
R. El-Shazoly
In the present study the ameliorating effects of Si nutrition supplied as 1 mmol L−1 sodium silicate were proved on the seedling growth of canola (Brassica napus L.) seedlings under salinity stress (i.e. 0, 30, 60, 90 and 120 mmol L−1sodium chloride). Salinity obviously disrupted cellular homeostasis, something was evident in the decreased percent of scavenging HO-free radical and Metal chelating %, and hence reduction in photosynthetic pigments contents (chl.a and carotenoids). Silicon nutrition, however, enabled canola cells to balance between the steady-state levels of different ROS through improving the detoxification of the excess ROS. This was prevalent in higher scavenging percent of HO- and metal chelating. In addition, Si maintained membranes integrity through improved levels of lipid peroxidation inhibition %. Si buffered oxidative stress through sustaining the enzymatic and non-enzymatic scavenging capacity of reactive oxygen species in salt-stressed plants. Enzymatic antioxidants such as (CAT, SOD, APX, and POS) activities as well as non-enzymatic antioxidants such as carotenoids contents phenolics contents increased at 120 mmol L−1 sodium chloride. Thus, silicon nutrition alleviated the deleterious effects of salinity on the growth of canola plants through increased reactive oxygen species scavenging capacity (enzymatically and non-enzymatically), maintaining the membrane integrity of seedling cells as evidenced by raising the reducing power contents, sustained higher levels of chlorophyll. Consequently, enhance seedlings growth observations.
在盐胁迫(0、30、60、90和120 mmol L−1氯化钠)条件下,研究了1 mmol L−1硅酸钠对油菜幼苗生长的改善作用。盐度明显破坏了细胞内稳态,明显降低了清除ho自由基的百分比和金属螯合的百分比,从而降低了光合色素含量(chl)。A和类胡萝卜素)。然而,硅营养通过改善过量活性氧的解毒,使油菜细胞能够在不同活性氧的稳态水平之间保持平衡。这是普遍存在于高清除百分比的HO-和金属螯合。此外,Si通过提高脂质过氧化抑制水平来维持膜的完整性。硅通过维持盐胁迫植物活性氧的酶和非酶清除能力来缓冲氧化胁迫。在120 mmol L−1氯化钠处理下,酶促抗氧化剂(CAT、SOD、APX和POS)活性和非酶促抗氧化剂(类胡萝卜素含量、酚类物质含量)均显著升高。由此可见,硅营养通过提高活性氧清除能力(酶促和非酶促),维持幼苗细胞的膜完整性,维持较高的叶绿素水平,减轻了盐度对油菜生长的有害影响。因此,加强幼苗生长观察。
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引用次数: 3
Pharmaceutically active secondary metabolites of newly isolated actinobacteria from two Cameroonian soils 喀麦隆两种土壤中新分离的放线菌的药物活性次生代谢物
IF 0.3 Q4 ENVIRONMENTAL SCIENCES Pub Date : 2019-02-18 DOI: 10.12816/CAT.2019.27395
Steve Takoukam Toukam, A. Ngakou, S. Mansour
Clinical infectious diseases are a major public health concerns worldwide, particularly in developing countries, where access to health care is extremely limited. In a context of increased development of antibiotic-resistant microorganisms, extensive research efforts, to explore novel antimicrobial from newly isolated organisms, are in need. Therefore, our study was carried out to isolate actinobacteria, for the first time, from two different soils collected from Cameroon. Fifty-eight out of 81 isolates of actinobacteria showed antimicrobial activity against human pathogens based on agar disc overlay bioassay. Meanwhile, the excreted metabolites of these actinobacteria were also tested for antimicrobial activity using agar disc diffusion test. Nine Gram-positive and negative human bacterial pathogens were used. One fungal pathogen was also tested. Our results showed that the most active actinobacterial isolates are belonging to the genera: Microtetraspora sp. (CSU3), Nocardiopsis sp. (CSU5), Streptomyces sp. (PSP3, PSU28 and PSU30), and Micromonospora sp. (CSD50). Streptomyces sp. and Actinomadura sp. isolates were the most dominant genera producing potent antimicrobial secondary metabolites, indicating that Streptomycetes-phenotype isolates are providing high quality metabolites for drug discovery purposes. Natural occurring biochemical compounds excreted in liquid media were also tested and proved the presence of alkaloids and tannins compounds.
临床传染病是世界范围内的一个主要公共卫生问题,特别是在获得保健的机会极其有限的发展中国家。在抗生素耐药微生物日益发展的背景下,需要进行广泛的研究工作,从新分离的生物体中探索新型抗菌剂。因此,我们首次从喀麦隆采集的两种不同土壤中分离放线菌。经琼脂盘覆盖生物测定,81株放线菌中有58株具有抑菌活性。同时,采用琼脂盘扩散法测定放线菌的代谢产物的抑菌活性。使用革兰氏阳性和阴性的人类细菌病原体9种。还测试了一种真菌病原体。结果表明,最具活性的放线菌属为微四孢子菌属(CSU3)、无心菌属(CSU5)、链霉菌属(PSP3、PSU28和PSU30)和小单孢子菌属(CSD50)。链霉菌(Streptomyces sp.)和放线瘤菌(Actinomadura sp.)分离株是产生强效抗菌次级代谢物的最主要属,表明链霉菌表型分离株为药物发现提供了高质量的代谢物。还测试了在液体介质中排泄的天然生化化合物,并证明了生物碱和单宁化合物的存在。
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引用次数: 0
Possible Hepatoprotective Effects of Mustard Seed Extract Against Paracetamol-Induced Liver Injury in Male Albino Rat 芥菜籽提取物对白化雄性大鼠扑热息痛肝损伤的保护作用
IF 0.3 Q4 ENVIRONMENTAL SCIENCES Pub Date : 2018-09-01 DOI: 10.21608/cat.2018.14337
Howayda E. Khaled
The evaluation of hepatoprotective effect of Mustard seed (MS) extract was assessed against paracetamol induced hepatic injury in albino rats. Animals were divided into 4 groups, each of 5 rats. Group I served as control group; group II treated with ethanolic extract from Mustard seed at a dose level of 500 mg/kg body weight orally once for 10 days. Group III represents induced liver injury animals using single dose of paracetamol (PCT). Group IV combined treatment of MS extract and PCT. Elevated serum marker enzymes such as ALT, AST, ALP, GGT and LDH were observed due to paracetamol treatment. Combined administration of MS extract with PCT to rat partially normalized the altered hepatic biochemical markers caused by PCT. Moreover, PCT caused histological changes in livers of rat including swelling and dilation in sinusoidal space, inflammation in portal tract and hepatocytes, as well as, hyperplasia in Kuppfer cells. However, co-administration of MS extract with PCT alleviated to some extent the changes caused by PCT but not as the normal liver. The results of this study strongly indicate that Mustard seed has possible potent hepatoprotective action against paracetamol induced hepatic damage in rats.
研究了芥籽提取物对扑热息痛致白化大鼠肝损伤的保护作用。动物分为4组,每组5只大鼠。第一组为对照组;II组用芥菜籽乙醇提取物处理,剂量水平为500 mg/kg体重,口服1次,连续10 d。第三组为单剂量扑热息痛(PCT)诱导的肝损伤动物。IV组MS提取物与PCT联合治疗,对乙酰氨基酚治疗后血清标记酶ALT、AST、ALP、GGT、LDH升高。MS提取物与PCT联合给药可使PCT引起的肝脏生化指标改变部分正常化,PCT引起大鼠肝脏组织学改变,包括窦腔肿胀扩张、门静脉和肝细胞炎症、库普弗细胞增生。然而,MS提取物与PCT合用在一定程度上减轻了PCT引起的肝脏变化,但对正常肝脏的影响较小。本研究结果强烈提示芥菜籽对扑热息痛引起的大鼠肝损伤可能具有有效的保肝作用。
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引用次数: 2
Taxonomic, DNA Barcoding and Phylogenetic Reassessment of the Egyptian Ephedra L. (Ephedraceae) 埃及麻黄属植物的分类、DNA条形码及系统发育再评价
IF 0.3 Q4 ENVIRONMENTAL SCIENCES Pub Date : 2018-09-01 DOI: 10.12816/CAT.2018.14292
A. Faried, A. El-Banhawy, Mesfer Elqahtani
This study attempts to carry out a critical revision for the genus Ephedra in Egypt based on morpholo-gical characters for leaf, stem and flower. DNA sequencing data used for the first time for DNA barcoding of the family Ephedraceae in Egypt. One chloroplast marker-intergenic spacer trn-H/psb-A and another nuclear Internal Transcribed Spacer (ITS) were sequenced to authenticate the identification and to reconstruct the phylogenetic relationships of the Egyptian Ephedra species. The results revealed that, the name of Ephedra ciliata Fischer and C. A. Mey., was illegitimate and became a synonym to Ephedra foliata Boiss., which reported here as accepted name. The current work recommends using the DNA barcode as a tool for species identification of Ephedra species as well as other gymnosperms in Egypt.
本研究试图基于叶、茎和花的形态特征对埃及麻黄属植物进行关键性的修订。首次利用DNA测序数据对埃及麻黄科植物进行DNA条形码分析。对一个叶绿体标记-基因间间隔序列trn-H/psb-A和另一个核内部转录间隔序列(ITS)进行了测序,以验证鉴定并重建埃及麻黄种的系统发育关系。结果显示,麻黄的名称为Fischer和c.a. Mey。它是非法的,并成为麻黄叶的同义词。,此处报告为公认名称。目前的工作建议使用DNA条形码作为一种工具来识别麻黄以及埃及的其他裸子植物。
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引用次数: 5
期刊
Catrina-The International Journal of Environmental Sciences
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