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| 1 | 腐植酸产品特性及其对真菌和植物生长的影响显示文摘天然腐植酸主要来自风化煤和褐煤等,其产品主要有Pak腐植酸盐、腐植酸盐肥料、PakHumax、Hum-kara和Humide等,它们在使用之前必须了解其功效。本研究比较了4种腐植酸肥料的理化性质、光学特性以及对小麦(栽培品种Sehr)、绿豆(绿豆-54)、玉米(C-12)和田菁种子萌发和生长的影响,同时研究了它们对4种真菌的影响。4种腐植酸肥料的含水量为52%~71.11%,溶解度为30.2%~98.2%,密度为1.67~4.17g/mL,2%腐植酸肥料水溶液pH值为5.39~10.11,EC值为3.140~1.143mS/cm。4种腐植酸肥料的碳含量为22.95%~36.56%、氮含量为0.658%~1.183%,相应的C/N比为30.91~44.16。将4种腐植酸肥料用0.1mol/LNaOH溶液溶解,分离获得腐植酸和黄腐酸,按含碳量计算,含碳量40.3%~77.5%的为腐植酸,含碳量22.5%~59.7%的为黄腐酸。对腐植酸在400nm、500nm、600nm和700nm下的光学性质进行了研究,并对465nm和665nm条件下的吸光度进行测量,计算其比值E4/E6(即消光系数)。结果表明,E4/E6比值变化在3.64~5.48之间,且光密度随着波长的增加而降低,与腐殖质的碳含量具有显著相关性。供试的4株真菌中,根据菌落直径观察,Tricho-dermaharzianum,T.hamatum和Alternariaalternate3种真菌在0.025%腐植酸培养基上生长最好。4种腐植酸肥料对小麦、玉米、绿豆种子萌发都有抑制作用,但对田菁种子萌发具有促进作用;对小麦和玉米的根具有促进生长的作用,同时可以提高小麦和玉米芽的干物质含量,而对绿豆和田菁没有影响。研究发现,巴基斯坦市场上销售的腐植酸肥料差异很大,为保障使用者的利益,对这些肥料进行质量监测十分必要。 | Asma Lodhi Shermeen Tahir Zafar Iqbal Ansar Mahmood Muhammad Akhtar Tariq Mahmood Qureshi Muhammad Yaqub Asif Naeem 董心亮 管天玉 林启美 | 2014 | 腐植酸2014，，2： | 2 |
| 2 | Relative weight--age in textbook and examination of secondary school chemistry-- implications for selective study among students显示文摘 | Akhtar Hussain Muhammad Amir Hashmi Syed Imtiaz Hussain Naqvi Shafqat Naeem Akhtar | 2010 | Procedia Social and Behavioral Sciences2010，2，： | 1 |
| 3 | Vibration analysis of damaged and undamaged steel structure systems: cantilever column and frame显示文摘This paper presents the experimental and numerical studies conducted on a steel column and a steel frame structure using free vibration analysis.The effects of damages on structures were investigated,which were simulated by introducing multiple cracks at different locations in the experimental and numerical models.The acceleration responses of the test models,were recorded through an accelerometer,and were used to calibrate the numerical models developed in finite element based software.Modal frequencies of damaged and undamaged structures were compared and analyzed,to derive relationships for damaged and undamaged structures’frequencies in terms of crack depth.It was found that,due to the presence of cracks,the mechanical properties of a structure changes,whereby,the modal frequencies decrease.An approximately linear trend was observed for the frequency decrease with the increase in crack depth,which was also confirmed by the numerical models.The derived relationships were extended to further develop a mechanics-based damage scale for steel structures,to help facilitate structural health monitoring and screening of vulnerable structures. | Muhammad Abuzar Khan Kareem Akhtar Naveed Ahmad Feroz Shah Naeem Khattak | 2020 | Earthquake Engineering and Engineering Vibration2020，19，3： | 1 |
| 4 | Relationship Between Customer Satisfaction andService Quality of Islamic Banks显示文摘 | Muhammad Naeem Akhtar Ahmed Imran Hunjra Syed Waqar Akbar Kashif-Ur-Rehman and Ghulam Shabbir Khan Niazi | | 0，，03： | 1 |
| 5 | Gene cloning and characterization of a xylanase from a newly isolated Bacillus subtilis strain R5显示文摘 | Amir Jalal Naeem Rashid Nouman Rasool Muhammad Akhtar | 2008 | Journal of Bioscience and Bioengineering2008，，4： | 1 |
| 6 | Influence of Y^(3+),Yb^(3+),Gd^(3+) cations on structural and electromagnetic properties of CuFe_(2)O_(4) nanoferrites prepared via one step sol-gel method显示文摘Rare earths(REs) play a key role in distorting spinel structure by creating some defects at the lattice sites and make them suitable for magnetodielectric applications.In the present study,the nanoferrites of CuRE0.02Fe1.98O4,where REs=Y^(3+),Yb^(3+),Gd^(3+),were prepared using one step sol-gel method.The prepared samples are copper ferrite(CFO),yttrium doped copper ferrite(Y-CFO),ytterbium doped copper ferrite(Yb-CFO) and gadolinium doped copper ferrite(Gd-CFO),respectively.The single-phase structure of all the REs doped nanoferrites was determined by X-ray diffraction(XRD) analysis.The porosity,agglomerations and grain size of the REs doped copper ferrite were examined using field emission scanning electron microscopy(FESEM) analysis.Fourier transform infrared spectroscopy(FTIR)elaborates the phase formation and environmental effects on the REs doped nanoparticles(NPs).The recorded room temperature M-H loops from a vibrating sample magnetometer(VSM) elucidate the magnetic properties of the REs doped spinel nanoferrites.The magnetic saturation(Ms) was calculated in the range of 23.08 to 51.78 emu/g.The calculated coercivity values(272.6 to 705.60 Oe) confirm the soft magnetic behavior of REs doped copper ferrites.Furthermore,the electromagnetic and dielectric properties were assessed using a Vector network analyzer(VNA) from 1 to 6 GHz.The permeability,permittivity,dielectric tangent loss and electric modulus of the REs doped spinel ferrites illustrate that the prepared NPs may be suitable for microwave and high frequency applications. | Aleena Kiran Majid Niaz Akhtar Muhammad Yousaf Khalid Mujassam Batoo Omar MAldossary Salman Naeem Khan | 2021 | Journal of Rare Earths2021，39，10： | 1 |
| 7 | Gene expression pattern of K transporter GhHAK5 gene of potassium efficient and in-efficient cotton cultivars based on morphological physiognomies as affected by potassium nutrition and reduced irrigation显示文摘Background Under K deficiency the uptake and distribution pattern in plant cells is mediated through different transport proteins and channels which were controlled by specific gene family.Therefore,a hydroponic experiment was conducted under control condition for testing the gene expression pattern of the K transporter under adequate and low K supply levels.After that,a 2-year field experiment was conducted to evaluate five selected cotton cultivars(four K-efficient cultivars,viz.,CIM-554,CYTO-124,FH-142,IUB-2013,and one K non-efficient,BH-212) screened from the initial hydroponics culture experiment and two levels of potassium(0 K_(2)O kg·ha^(-1) and 50 K_(2)O kg·ha^(-1)) were tested under reduced irrigation(50% available water content;50 AWC) and normal irrigation conditions(100% available water content;100 AWC).Result Results revealed that the transcript levels of GhHAK5aD in roots were significantly higher in K^(+) efficient cultivars than that in K^(+) non-efficient cultivars.The GhHAK5aD expression upon K^(+) deficiency was higher in roots but lower in shoots,indicating that GhHAK5aD could have a role in K^(+) uptake in roots,instead of transport of K^(+) from root to shoot.Similarly,under field conditions the cultivar FH-142 showed an increase of 22.3%,4.9%,2.4%,and 1.4% as compared with BH-212,IUB-2013,CYTO-124,and CIM-554,respectively,in seed cotton yield(SCY) with K application under reduced irrigation conditions.With applied K,the FH-142 showed an increase in net photosynthetic rate by 57.3% as compared with the rest of the cultivars under reduced irrigation over K control.However,the overall performance indicators of K-efficient cultivars like FH-142,CYTO-124,CIM-554,and IUB-2013 were better than BH-212(K in-efficient) under reduced irrigation conditions with applied K at 50 kg·ha^(-1).Fiber quality trait improved significantly with K application under water deficit.The increase in micronaire was 3.6%,4.7%,7.8%,3.4%,and 6.7% in BH-212,IUB-2013,CIM-554,CYTO-124,and FH-142,respectively,with K application at 50 kg·ha^(-1) over without K application under reduced irrigation conditions during the cotton growing season.Similarly,the cultivars FH-142 increased by 12% with K application under reduced irrigation as compared with other cultivars.The performance of K-efficient cultivars under reduced irrigation conditions was 30% better in SCY and quality traits with the application of K at 50 kg·ha^(-1) as compared with K-non-efficient cultivars.Similarly,water use efficiency(WUE)(40.1%) and potassium use efficiency(KUE)(20.2%) were also noted higher in case of FH-142 as compared with other cultivar with K application under reduced conditions.Conclusion Higher expression of GhHAK5aD gene was observed in K-efficient cultivars as compared with K-nonefficient cultivars in roots indicates that GhHAK5aD may be contributing to genotypic differences for K^(+) efficiency in cotton.K-efficient cotton cultivars can be used for the low-K environments and can also be recommended for general cultivars. | AKHTAR Muhammad Naeem HAQ Tanveer ul AKHTAR Muhammad Waseem ABBASS Ghulam | 2023 | Journal of Cotton Research2023，6，3： | 0 |
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