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Dive into the research topics where Sami Ullah Khan is active.

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Featured researches published by Sami Ullah Khan.


Potato Research | 2015

Sugar-Starch Metabolism and Antioxidant Potential in Potato Tubers in Response to Different Antisprouting Agents During Storage

Kashif Sarfraz Abbasi; Tariq Masud; Sartaj Ali; Sami Ullah Khan; Talat Mahmood; Abdul Qayyum

Single applications of different antisprouting agents like hot water treatment, spearmint oil and clove oil were carried out on potato cultivar “Lady Rosetta” to compare their efficacy with that of synthetic chloro isopropyl N-phenyl carbamate (CIPC). The tubers were stored at ambient storage conditions (25u2009±u20092xa0°C) for 81xa0days to assess changes in their sugar-starch concentrations and antioxidant potential. Antioxidant potential in the tubers was assessed as their total phenolic concentrations and radical scavenging activities. In addition, the enzymatic activities were also determined in order to evaluate the possible depletion of these antioxidants as substrate during storage. Results revealed significant response of stored potatoes to all antisprouting agents compared with the control (Pu2009≤u20090.05). CIPC and clove oil applications maintained tuber dormancy almost twice as long (81xa0days) as observed in the control (45xa0days). Application of spearmint oil and hot water treatment maintained tuber dormancy for almost 2xa0months. However, it was associated with an increased percentage sprouting during the last weeks of storage. At the end of storage, the highest starch (16.83%) and lowest sugar (0.99%) concentrations were estimated after CIPC application and maximum total phenolic concentration (143.57xa0mg gallic acid equivalent (GAE)/100xa0g), and highest antioxidant activity (39.73%) were found after clove oil application. Enzymatic activities were not statistically different between CIPC and clove oil application during most of the storage period. Results showed that efficient replacement of CIPC with clove oil in the premium potato cultivar might be useful; this may avert related food safety and environmental issues and would also ensure organic potato storage.


Acta Agriculturae Scandinavica Section B-soil and Plant Science | 2018

Water stress effects on biochemical traits and antioxidant activities of wheat (Triticum aestivum L.) under In vitro conditions

Abdul Qayyum; Abdul Razzaq; Yamin Bibi; Sami Ullah Khan; Kashif Sarfraz Abbasi; Ahmad Sher; Ayaz Mehmood; Waseem Ahmed; Imran Mahmood; Abdul Manaf; Ayub Khan; Abid Farid; Matthew A. Jenks

ABSTRACT Water stress is one of the major environmental stresses that affect agricultural production worldwide, especially in arid and semi-arid regions. This research investigated the effect of water deficit, induced by PEG-6000 on wheat genotypes (GA-2002, Chakwal-97, Uqab-2000, Chakwal-50 and Wafaq-2001) grown in modified MS medium solution. Osmotic stress caused a more pronounced inhibition in leaf relative water content and leaf membrane stability more sensitive (index in Wafaq-2001 and Uqab-2000) genotypes compared with the tolerant (Chakwal-50, GA-2002 and Chakwal-97) genotypes. Upon dehydration, an incline in proline, total soluble sugar, total soluble protein, superoxide dismutase, peroxidase, catalase and malondialdehyde activity content were evident in all genotypes, especially at osmotic stress of −8 bars. The observed data showed that status of biochemical attributes and antioxidant enzymes could provide a meaningful tool for depicting drought tolerance of wheat genotypes. The present study shows that genotypic differences in drought tolerance could be likely attributed to the ability of wheat plants to induce antioxidant defense under drought conditions. In order to develop genotypes with stable, higher yields in dry farming conditions, it is necessary to characterise genetic resources based on drought adaptation, determine suitable genotypes, and then use them in breeding programmes.


Planta Daninha | 2017

Sunflower (Helianthus annuus) Hybrids Evaluation for Oil Quality and Yield Attributes under Spring Planting Conditions of Haripur, Pakistan

Iqrasan; Abdul Qayyum; Sami Ullah Khan; S.A. Khan; Ayaz Mehmood; Yamin Bibi; Ahmad Sher; H. Khan; Jenks

Field experiment was conducted at the University of Haripur, Pakistan, to explore the role of photothermal units on oil contents, fatty acids profile, yield and yield traits of four sunflower hybrids viz SMH-0917, NK-S-278, SMH-0907 and Hysun33. These sunflower hybrids were selected because the farmers of that area are mostly relying on these hybrids for sunflower production. Sunflower hybrids were sown in spring and arranged under Randomized Complete Block Design with 3 replications under field conditions. Significant variation (p ≤ 0.05%) was found among the sunflower hybrids for photothermal unit requirements for flower completion and physiological maturity. Highest photothermal unit accumulation was found in Hysun33 followed by SMH-0917 and SMH-0907. Highest seed oil content and oil composition (linoleic and oleic acid were most abundant, whereas palmitic acid was least) was recorded in Hysun-33, SMH-0917 and SMH-0907. Overall Hysun-33, SMH-0917 and SMH-0907 performed better for plant height, head diameter, number of achenes per head and achene yield under field conditions. It was also observed that temperature and moisture availability positively influenced the oil quality of sunflower hybrids under spring planting conditions. The significant amount of variation within the sunflower population for photothermal unit accumulation, oil content, oil quality, and yield traits under these uniform field conditions reveals potential genetic variation that could be useful in breeding early maturing and high yielding local sunflower hybrids.


Nuclear Medicine Communications | 2009

Thyroid dyshormonogenesis detected through a modified perchlorate discharge test using a gamma-camera.

Sami Ullah Khan; Aakif U. Khan; Ayub Khan; Kamran Khan; Hameed ullah

ObjectiveTo find an easy tool to detect dyshormonogenesis. MethodsIn this study, the standard perchlorate discharge test was modified by using a &ggr;-camera instead of a &ggr;-probe to detect this rare abnormality. ResultsBy using this technique two cases of dyshormonogenesis were identified. ConclusionThe gamma-camera-based perchlorate discharge test is an easy, reliable, convenient, and feasible procedure where thyroid uptake probe is not available.


Archive | 2018

Omics Approaches in Marine Biotechnology: The Treasure of Ocean for Human Betterments

Fatima Abid; Muhammad Awais Zahid; Zain U. Abedin; Syed B. Nizami; Muhammad J. Abid; Sayyada Z. Hassan Kazmi; Sami Ullah Khan; Humna Hasan; Mohsin Ali; Alvina Gul

Abstract Marine biotechnology or “blue biotechnology,” as it is so aptly termed, is an arena of scientific research bursting with potential due to the possible contributions that can be made towards achieving an environmentally friendly and efficient society. Although this field of science is still quite young, it has helped scientists to achieve many significant milestones on the environmental as well as socio-economic fronts, which could not be attained through terrestrial resources alone. The advent of “omics” has revolutionized biotechnological research by bringing together a plethora of information from various cellular processes and applying it to examine a range of biological events at the basic molecular level. Marine biotechnology makes use of assorted “omics” such as genomics, proteomics, transcriptomics, nutrigenomics, and metabolomics. When combined, these have a profound effect on marine as well as human well-being.


Archive | 2018

Biotechnology and Bioengineering in Astrobiology: Towards a New Habitat for Us

Sameen Ruqia Imadi; Mustafeez Mujtaba Babar; Sami Ullah Khan; Humna Hasan; Mohsin Ali; Alvina Gul

Abstract Human kind is optimistic about the presence of alien civilizations in the outer space. The scientists are still working on the means to detect and make the first contact with the extraterrestrials. The current focus is on the search of nonintelligent microbial life forms. Moreover, efforts are underway to identify the optimum conditions to support life on other planets. Before the dawn of the space age, the moon was considered to be just a barren land formed by the ancient impact craters. Similarly Mars was just a distant planet and Venus was boiling cauldron of molten rock shrouded in dense and poisonous atmosphere. Significant progress has, however, been made after the recent discoveries in the field of astrobiology, astrobiotechnology, and synthetic space biology. This chapter presents the conditions that support life in the outer space. Techniques employed for the identification and detection of organic molecules, fossilized microorganisms, and minerals have also been discussed. Moreover, the potential of life outside earth with reference to the extremophile organisms has been addressed. Finally, the future role of astrobiology in finding new home for the living organisms has been discussed.


Archive | 2018

Omics Approaches in Forensic Biotechnology: Looking for Ancestry to Offence

Syed B. Nizami; Sayyada Z. Hassan Kazmi; Fatima Abid; Mustafeez Mujtaba Babar; Aneeqa Noor; Najam-us-Sahar Sadaf Zaidi; Sami Ullah Khan; Humna Hasan; Mohsin Ali; Alvina Gul

Abstract Forensic biotechnology deals with the study and investigation of genomic information for the identification of specific signatures. The data obtained from forensic biotechnology are utilized by the legal system to make necessary interpretations about criminals. Because of its potential to identify unique genetic markers, the discipline has also been employed for the determination of parenthood or other familial characteristics. Traditionally this field relied on a few basic techniques of genetics like DNA fingerprinting. However, the recent developments in the field of genomics, transcriptomics, and proteomics have made the forensic sciences increasingly sensitive and reliable. The availability of the minutest amount of sample (like blood, hair, or other body tissues) can help in extracting the information in a timely manner that would otherwise have taken months to years to obtain. This chapter provides an introduction about the basic techniques involved in forensic technology. The developments in the field of omics sciences and how they have contributed to the field of forensic biotechnology have also been discussed.


Horticulture Environment and Biotechnology | 2018

Salicylic acid and kinetin mediated stimulation of salt tolerance in cucumber (Cucumis sativus L.) genotypes varying in salinity tolerance

Ali Raza Gurmani; Sami Ullah Khan; Amjad Ali; Tehseen Rubab; Timothy Schwinghamer; Ghulam Jilani; Abid Farid; Jin-Lin Zhang

Greenhouse studies were undertaken to evaluate the genetic performance of two cucumber genotypes (Long Green and Summer Green) at four salinity levels (0, 25, 50, and 100xa0mM NaCl). Seeds were pretreated with 50xa0mg salicylic acid (SA) L−1 and 25xa0mg kinetin (Kin) L−1. Under hydroponic conditions, seed pretreatment with Kin significantly increased shoot and root dry biomass and reduced the salt injury index in both genotypes. SA reduced the salt injury index of Long Green cucumbers. In a pot experiment, Kin treatment reduced Na+ and increased K+ concentration, photosynthesis, and chlorophyll content in both genotypes, compared to SA under saline soil conditions. Kin treatment improved fruit yield in both genotypes, while SA had a statistically significant effect on Long Green fruit yield. The application of SA and Kin enhanced salinity tolerance in both genotypes by the activation of antioxidants, especially superoxide dismutase, peroxidase, and catalase, which offset oxidative injury. Summer Green exhibited better salt tolerance and improved osmoregulation that resulted in higher fruit yield than Long Green. It was concluded that cucumber genotypes differed in salt tolerance, and seed pre-treatment with Kin minimized salt stress injury, even in sensitive genotype which could sustain crop production under saline conditions.


Horticulture Environment and Biotechnology | 2015

Evaluation of potential morpho-physiological and biochemical indicators in selecting heat-tolerant tomato (Solanum lycopersicum Mill.) genotypes

Jalal Ud Din; Sami Ullah Khan; Ahmad Khan; Abdul Qayyum; Kashif Sarfraz Abbasi; Matthew A. Jenks

A few degrees in temperature above the optimum can cause a considerable yield loss in tomatoes. A research experiment was conducted in which three tomato genotypes of (Solanum lycopersicum Mill.), ‘Suncherry Extra Sweet’ (Suncherry), ‘Walter’, and ‘CLN-2498d’, were evaluated for response to moderate high temperature at the reproductive stage. High temperature reduced the total number of fruits per plant, fruit size, number of seeds per fruit, seed setting, and relative ovule viability. However, high temperature increased proline accumulation and membrane thermo-stability in plant parts of the investigated genotypes. Fruit size and the number of seeds per fruit were reduced in all the genotypes, with the greatest reduction occurring in Suncherry. Similarly, viability of male and female gametes was also reduced in all of the investigated genotypes due to high temperature injury. The reduction in seed setting due to high temperature was greatest in ‘Suncherry’ and ‘Walter’, and least in ‘CLN-2498d’. Likewise, ovule viability was least reduced in ‘CLN-2498d’. The genotypes accumulating higher proline concentrations in reproductive parts and with enhanced membrane thermo-stability under high temperature likewise produced the highest fruit yield, and hence, exhibited high temperature tolerance.


International Journal of Agriculture and Biology | 2014

Screening and selection of synthetic hexaploid wheat germplasm for salinity tolerance based on physiological and biochemical characters.

A. R. Gurmani; Sami Ullah Khan; Fazli Mabood; Zahoor Ahmed; S. J. Butt; Jalal-Ud Din; Abdul Mujeeb-kazi; Donald L. Smith

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Alvina Gul

National University of Sciences and Technology

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Humna Hasan

Quaid-i-Azam University

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Mohsin Ali

National University of Sciences and Technology

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Mustafeez Mujtaba Babar

National University of Sciences and Technology

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Kashif Sarfraz Abbasi

Pir Mehr Ali Shah Arid Agriculture University

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Ahmad Sher

Bahauddin Zakariya University

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Aneeqa Noor

National University of Sciences and Technology

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