Anti-inflammatory activities of cucurbitacin E isolated from Citrullus lanatus var. citroides: role of reactive nitrogen species and cyclooxygenase enzyme inhibition     

Abdelwahab SI  Hassan LE  Sirat HM  Yagi SM  Koko WS  Mohan S  Taha MM  Ahmad S  Chuen CS  Narrima P  Rais MM  Hadi AH 《Fitoterapia》2011,82(8):1190-1197

The in vivo and in vitro mechanistic anti-inflammatory actions of cucurbitacin E (CE) (Citrullus lanatus var. citroides) were examined. The results showed that LPS/INF-γ increased NO production in RAW264.7 macrophages, whereas L-NAME and CE curtailed it. CE did not reveal any cytotoxicity on RAW264.7 and WRL-68 cells. CE inhibited both COX enzymes with more selectivity toward COX-2. Intraperitoneal injection of CE significantly suppressed carrageenan-induced rat's paw edema. ORAC and FRAP assays showed that CE is not a potent ROS scavenger. It could be concluded that CE is potentially useful in treating inflammation through the inhibition of COX and RNS but not ROS.  相似文献   

Effects of NaCl salinity on some leaf nutrient concentrations,non-photochemical quenching and the efficiency of the PSII photochemistry of two Iranian pomegranate varieties under greenhouse and field conditions: Preliminary results     

Mehdi Khayyat  Ali Tehranifar  Gholam Hossien Davarynejad  Mohammad Hassan Sayyari-Zahan 《Journal of plant nutrition》2016,39(12):1752-1765

The present research was conducted to study the responses of ‘Malas–e–Saveh’ (M) and ‘Shishe–Kab’ (Sh) Iranian pomegranates to sodium chloride (NaCl) stress under greenhouse and field conditions. Treatments included waters electrical conductivity (EC = 1.5, 3, 6, 9 and 12 dS m^?1 for greenhouse) and (EC = 1.05 as control, 4.61 and 7.46 dS m^?1 for field studies). Interactive effects of salinity × variety indicated the highest chlorophyll and leaf potassium concentration, and the lowest leaf chloride and sodium in control under greenhouse study. Non-photochemical quenching, effective quantum yield of photochemical energy conversion in PSII reduced under the highest salinity level in field, however, basal quantum yield of non-photochemical processes in PSII increased in the highest salinity. Sodium and chloride increased with increased in salinity. Calcium, magnesium and iron significantly decreased with increased in salinity. It seems that there are differences between pomegranate cultivars and Malas-e-Saveh is more tolerant compared with Shishe Kab.  相似文献   

Effect of Arbuscular Mycorrhizal Fungi and Phosphate-Solubilizing Bacteria Consortia Associated with Phospho-Compost on Phosphorus Solubilization and Growth of Tomato Seedlings (Solanum lycopersicum L.)     

Sanae El Maaloum  Alae Elabed  Zainab El Alaoui-Talibi  Abdelilah Meddich  Abdelkarim Filali-Maltouf  Allal Douira 《Communications in Soil Science and Plant Analysis》2020,51(5):622-634

ABSTRACT

The exploitation of phosphate mines generates an important quantity of phosphate sludge that remains accumulated and not valorized. In this context, composting with organic matter and rhizospheric microorganisms offers an interesting alternative and that is more sustainable for agriculture. This work aims to investigate the synergetic effect of arbuscular mycorrhizal fungi (AMF), phosphate-solubilizing bacteria (PSB) and phospho-compost (PC), produced from phosphate-laundered sludge and organic wastes, and their combination on plant growth, phosphorus solubilization and phosphatase activities (alkaline and acid). Inoculated mycorrhizae and bacteria strains used in this study were selected from plant rhizosphere grown on phosphate-laundered sludge. Significant (p < .05) increases in plant growth was observed when inoculated with both consortia and PC (PC+ PSB+ AMF) similar to those recorded in plants amended with chemical fertilizer. Tripartite inoculated tomato had a significantly (p < .05) higher shoot height; shoot and root dry weight, root colonization and available P content, than the control. Co-inoculation with PC and AMF greatly increased alkaline phosphatase activity and the rate of mycorrhizal intensity. We conclude that PC and endophytic AMF and PSB consortia contribute to a tripartite inoculation in tomato seedlings and are coordinately involved in plant growth and phosphorus solubilization. These results open up promising prospects for using formulate phospho-compost enriched with phosphorus-solubilizing microorganisms (PSM) in crop cultivation as biofertilizers to solve problems of phosphate-laundered sludge accumulation.  相似文献   

Sources of resistance in bread wheat to Russian wheat aphid (Diuraphis noxia) in Syria identified using the Focused Identification of Germplasm Strategy (FIGS)     

M. El Bouhssini  K. Street  A. Amri  M. Mackay  F. C. Ogbonnaya  A. Omran  O. Abdalla  M. Baum  A. Dabbous  F. Rihawi 《Plant Breeding》2011,130(1):96-97

  相似文献   

An approach for precision farming under pivot irrigation system using remote sensing and GIS techniques   总被引：1，自引：0，他引：1  

A.H. El Nahry  R.R. AliA.A. El Baroudy 《Agricultural Water Management》2011,98(4):517-531

The current work is aimed to realizing land and water use efficiency and determining the profitability of precision farming economically and environmentally. The studied area is represented by an experimental pivot irrigation field cultivated with maize in Ismailia province, Egypt. Two field practices were carried out during the successive summer growing seasons (2008 and 2009) to study the response of maize plants single hybrid 10 (S.H.10) to traditional and precision farming practices. Traditional farming (TF) as handled by the farm workers were observed and noted carefully. On the other hand precision farming (PF) practices included field scouting, grid soil sampling, variable rate technology and its applications. After applying PF a dramatic change in management zones was noticed and three management zones (of total four) were merged to be more homogenous representing 84.3% of the pivot irrigation field.Under PF Remote Sensing and Geographic Information System techniques have played a vital role in the variable rate applications that were defined due to management zones requirements. Fertilizers were added in variable rates, so that rationalization of fertilizers saved 23.566 tonnes/experimental pivot area. Natural drainage system was improved by designing vertical holes to break down massive soil layers and to leach excessive salts. Crop water requirements were determined in variable rate according to the actual plant requirements using SEBAL model with the aid of FAO Cropwat model. Irrigation schedule of maize was adopted considering soil water retention, depletion, gross and net irrigation saving an amount of water equal to 93,718 m³ in the pivot irrigation field (153.79 acre). However costs of applying PF were much higher than TF, the economic profitability (returns-costs) achieved remarkable increase of 29.89% as a result of crop yield increment by 1000, 2100, 800 and 200 kg/acre in the management zones 1, 2, 3 and 4, respectively. Finally applying adequate amounts of fertilizers beside water control the environmental hazards was reduced to the acceptable limits.  相似文献   

The proton microprobe: a powerful tool for nondestructive trace element analysis     

Bosch F  El Goresy A  Martin B  Povh B  Nobiling R  Schwalm D  Traxel K 《Science (New York, N.Y.)》1978,199(4330):765-768

A proton microprobe capable of focusing proton beams with energies up to 6 million electron volts to a spot size of 2 x 2 square micrometers has been used for chemical analysis of small grains of minerals in lunar samples by proton-induced x-ray emission. The proton microprobe is preferable to the electron microprobe for analyzing trace elements whose concentrations are below the detection limit of the latter and for analyzing objects with numerous major and trace elements with a wide range of atomic numbers. Application of the proton microprobe to biological samples is feasible.  相似文献   

A new dawn for science in Africa     

Hassan MH 《Science (New York, N.Y.)》2007,316(5833):1813

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不同土壤水分调控技术对土壤含水量和鸭梨果实品质的影响   总被引：3，自引：0，他引：3  

王国英  李宪松  齐国辉  黄瑞虹  王立国  IMRAN Hassan 《河北农业大学学报》2003,26(1):24-27

以13、20和30年生鸭梨为试材,分别在辛集市新垒头、泊头市苗圃场和曲阳县寺南庄梨园,研究了覆膜、定期浇水和对照3种不同土壤水分调控技术对土壤含水量和鸭梨品质的影响。结果表明,土壤含水量以定期浇水最高,对照和覆膜较低;平均单果重以定期浇水最大,覆膜次之,对照最小;果肉硬度则正相反;可溶性固形物、总糖含量和糖酸比以对照最高,覆膜次之,定期浇水最低;可滴定酸含量以定期浇水最高,对照和覆膜较低;Vc含量以覆膜最高,对照次之,定期浇水最低;果实淀粉和果皮叶绿素含量均表现为对照>定期浇水>覆膜。  相似文献   

Synthesized light transients     

Wirth A  Hassan MT  Grguras I  Gagnon J  Moulet A  Luu TT  Pabst S  Santra R  Alahmed ZA  Azzeer AM  Yakovlev VS  Pervak V  Krausz F  Goulielmakis E 《Science (New York, N.Y.)》2011,334(6053):195-200

Manipulation of electron dynamics calls for electromagnetic forces that can be confined to and controlled over sub-femtosecond time intervals. Tailored transients of light fields can provide these forces. We report on the generation of subcycle field transients spanning the infrared, visible, and ultraviolet frequency regimes with a 1.5-octave three-channel optical field synthesizer and their attosecond sampling. To demonstrate applicability, we field-ionized krypton atoms within a single wave crest and launched a valence-shell electron wavepacket with a well-defined initial phase. Half-cycle field excitation and attosecond probing revealed fine details of atomic-scale electron motion, such as the instantaneous rate of tunneling, the initial charge distribution of a valence-shell wavepacket, the attosecond dynamic shift (instantaneous ac Stark shift) of its energy levels, and its few-femtosecond coherent oscillations.  相似文献   

生物质成型燃料的热解燃烧特性试验研究   总被引：8，自引：0，他引：8       下载免费PDF全文

余有芳  盛奎川Hassan Gomaa 《浙江大学学报(农业与生命科学版)》2005,31(5):663-667

研究了棉杆成型块等生物质固体燃料在小型移动层上吸式热解燃烧炉中的热特性.结果表明,密度较大的棉杆成型块升温速率和降温速率均较低,挥发份的逸出时间增加,高温燃烧时间延长,炉子的热效率提高.棉杆成型块在炉胆中的充填量对可燃气体的稳定燃烧和高温火焰的持续时间影响显著.填满炉胆的棉杆成型块的燃烧性能优于棉杆,其燃烧热效率达39.3%,为棉杆的1.72倍.  相似文献