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Articles by M.A. Khan
Total Records ( 16 ) for M.A. Khan
  R.H. Rahman , N. Nowsheen , M.A. Khan and C.F. Ahmed
  In a distributed computer system and similar networks of computers it is necessary to have mechanisms by which various pairs of principals satisfy themselves mutually about each other`s identity-they should become sure that they really are talking to each other, rather than to an imposter impersonating the other agent. This is the role of an authentication protocol. Various authentication protocols based on public key and symmetric key cryptography have been developed for recent twenty or thirty years. Most of the symmetric key authentication schemes deployed today are based on principles introduced by Needham and Schroeder. In this study, we have proposed a symmetric key authentication scheme basically based on the Needham and Schroeder five-message protocol. The aim of our proposed method is to improve the existing Needham and Schroeder five message protocol in two aspects. One is to improve the time needed to distribute key between pair of nodes, i.e. making the key distribution process faster. And the second aspect is to develop on the weak security of the existing system.
  Ehsan-ul-Haq , M.A.S. Kirmani , M.A. Khan and M. Niaz
  29 wheat lines were tested in the field against stripe rust disease of wheat under natural conditions. These lines had different genotypes of different origin. Only leaf infection was recorded. Reactions were ranging from immunity to extreme susceptibility 15 lines were found resistant. The reactions among these advance line were recorded variable. Rest of the 14 lines were found susceptible to this disease. These were advance lines with high yield potential as well as high disease resistant. After 4-5 years these lines will be determined as commercia wheat cultivars.
  Muhammad Ishtiaq Ch. , M.A. Khan and Wajahat Hanif
  This study comprises of an ethnoveterinary report of medicinal plants of Samahni valley. It provides folk medicinal uses of plants used for treatment of various diseases of domestic animals. Among these important traditional knowledge is as; Albizzia lebbeck is used to treat chronic diarrhoea, dysentery and snake bite, Abutilon theophrasti in ephemeral fever, Bauhania variegata in severe constipation, Butea monosperma, Linum usitatissimum and Taraxacum officinale as tonic to enhance milk and butter production, Calotropis procera and Phyllanthus acidus as antidote for snake bite, Canabinus sativus as anti ecto-parasites, Capsicum annum and Putrangiva roxburgii in bad eye effects, Carissa opaca and Viola kashmiriana in Mokhar, Citrullus colcynthus as antihelmintic, Citrullus limon as tonic for prolapse of uterus, Dalbergia sisso for bilious disorders, Grewia asiatica effective in release of after birth, Gymnosporia royleana in spleen pain, Momordica dioca in lungs disorders, Musa paradisiaca to enhance pregnancy, Ricinus communis in mange of goat, Sassuria heteromala for horse bite, Trichodesma indica in mastitis. Every plant species is provided with correct botanical name, local name, ethnomedicinal use(s) and mode of use. These folk lore informations hold water how traditional ethnomedicines have paramount importance in life and culture of a community generally and how these ethnoherbal data have key role in life, society and economy of people of area and more over it can be initiative for further phytochemical and pharmacological investigations about these medicinal plants of valley, which may be a step ahead towards new drug development. And last but not least, this report will helpful for some departments, forest, environmental, veterinary and lay man to provide clue for conservation of natural flora as before it is totally diminished from the surface.
  S.M. Alam and M.A. Khan
  It was observed from the results that treatments had no effect on seed germination of rice. Both shoot and root lengths were substantially decreased. Root length was affected more than the shoot growth irrespective of treatments.
  D.S. Saiqa and M.A. Khan
  Congestion management comprising congestion relief and congestion cost allocation is one of the important operational tasks to be carried out in deregulated power system. Very few methods reported in literature address the combined problem of congestion relief and cost allocation. Congestion relief is obtained using optimal injection corrections from willing participants (both GENCO`s and DISCO`s) for a price and adjustments of the control settings of the UPFCs (cost free ) located in the transmission lines. The solution approach proposed takes care of the enforcement of the operating limits of the control parameters of UPFC. Congestion usage charges for using the congested lines are allocated equitably to the transactions causing congestion. This study addresses the impact of UPFCs on congestion relief and allocation of congestion charges to dominant transactions in a combined pool and bilateral market using DC-load flow model. Linear Programming optimization technique is used to solve this congestion management problem. The results obtained for IEEE 24 bus Reliability Test System demonstrate the impact of cost free action of UPFCs on congestion relief and equitable allocation of charges.
  1Tahir B. , F.R. Durrani , M. Farooq , Z. Durrani , Sar Zamin , M.A. Khan and Riaz. A.
  Morbid materials from 25 commercial broiler breeder farms located in Abbottabad and Mansehra districts were collected over one year period to investigate prevalence of Fowl cholera and study efficiency of various organs to be used as diagnostic tools for fowl cholera. Overall incidence of Fowl cholera was (0.80?0.26%) with a coefficient of variation of 231.45%, indicating significantly higher incidence (1.07?0.62%) in Mansehra than in Abbottabad (0.53?0.34%). Significantly (p<0.05) lower incidence of Fowl cholera was found in vaccinated (0.15?0.26%) than in non-vaccinated flocks (1.45?0.63%). Higher incidence (1.35?0.38%) of Fowl cholera was found in farms previously exposed to Fowl cholera disease as compared to those in which there was no previous incidence (0.25?0.29%). Fowl cholera was found positively (p<0.01) and significantly associated with flock age (b=0.074661?0.03389) but negatively associated with egg production (b=-16.24429?0.928103). Liver was found to be the best organ for diagnosis of Fowl cholera in broiler breeder flocks.
  S.M. Alam , S.A. Ala , A.R. Azmi , M.A. Khan and R. Ansari
  Not available
  Naveed Qamar and M.A. Khan
  Six varieties/advance lines viz FSD-Red, Sante, Desiree, Kiran, Diamont and SH-5 were sown for the disease development of PVX and to study relationship with environmental conditions (Maximum and minimum temperature, relative humidity, wind velocity, clouds, pan evaporation and wind direction). Maximum PVX disease severity was recorded at 25-27°C maximum and 10-12°C minimum temperature. There was an increasing trend of disease development at 15-31°C maximum and at 5-13°C minimum temperature as explained by log regression models indicated by higher r values (0.82 and 0.99), 80-86 relative humidity with increasing trend with higher r values (0.99) and the highest PVX disease severity was recorded at 1.7-2.3 mm pan evaporation as explained by log regression models indicated by higher r values (0.98). None of the variety had significant correlation with clouds, wind velocity and wind direction.
  S.M. Alam , R. Ansari and M.A. Khan
  Seeds of sweet clover in combination with 0.4 % NaCl significantly decreased the germination and had severe inhibitory effects on shoot and root lengths of rice. Root length was affected more than the shoot and the effect of NaCl was accentuated on the presence of weed seed.
  L.A. Lodhi , Z.I. Qureshi , M.A. Khan and S. Hayat
  Serum levels of glucose, total proteins, calcium and phosphorus were determined by light absorption spectrophotometry in cycling, non-cycling, repeat breeder and endometritic buffaloes (n = 16 in each group). The cycling buffaloes had significantly higher levels of glucose than the other three groups (P<0.05). The total protein concentration was significantly higher in cycling as compared to endometritic and non-cycling buffaloes (P<0.05). The significantly higher calcium concentration was determined in cycling buffaloes as compared to rest of three groups. The level of inorganic phosphorus was significantly higher in repeat breeder and cycling group of buffaloes (P<0.05). It was inferred from the present study that lower concentrations of blood glucose, total protein and calcium and higher concentrations of inorganic phosphorus might account for non-cycling, repeat breeding and endometritis in buffaloes.
  Shirazi M.U. , B. Khanzada , S.M. Alam , R. Ansari , S.M. Mujtaba , Muhammad Ali , Mukhtiar Ali and M.A. Khan
  Nutrients variation studies were conducted to understand the nutrient cycle (particularly nitrogen, phosphorus and cations) in four year old Acacia plantation ( Acacia nilotica and Acacia ampliceps) and the impact of salinity on nutrient cycling. Leaf samples were collected around the umbrella of 10 trees of each Acacia for nutrient content at the interval of two months. Soil salinity in the immediate proximity of the tree trunk was also monitored. Analytical results showed that both the species had adequate amount of nitrogen and phosphorus. Potassium was also near the critical levels. However, the Ca content was comparatively higher, which might be due to presence of organic acids during decomposition of organic residues present at the soil surface. Studies on monthly variation in mineral elements suggested that only single time period for sampling to study the nutrient status or scheduling time of fertilizer application is not appropriate. Therefore, the best time for studying nutrient status and fertilizer application would be during March-April or September-October, when the weather is mild and salinity is moderate.
  M.A. Khan , M.M. Rashid , M.A. Siddique , M.R. Amin and M.S. Rahman
  The present study was carried out through the period of 1999-2000, to investigate the future prospects of orange cultivation in the Panchagarh region of Bangladesh. The study revealed that the Panchagarh district is endowed with favorable environmental conditions for the growth and development of sweet orange/ mandarin production.
  M.A. Khan , S.M. Alam , S.S.M. Naqvi , S.A. Ala , M.H. Naqvi , S. Mumtaz , A. Shereen , M. Ali , M.U. Shirazi , Mukhtiar Ali and B. Khanzada
  An experiment was conducted in Plant Physiology Division at NIA, Tandojam, to find out a suitable growing technique for germination and seedling growth of wheat (Triticum aestivum L.). Techniques used were: I) Inclined glass plate blotter, ii) Agar gel medium and iii) PVC Germinator. There were no significant differences among the three planting methods on the germination and seedling growth of wheat. However, PVC Germinators were convenient and inexpensive compared with the agar gel and inclined glass plate blotter methods.
  Ch. Muhammad Ishtiaq , M.A. Khan and Wajahat Hanif
  Indigenous plants are indirectly associated to the culture and traditions of the local peoples. About 36 plant species, distributed in 26 families were used to treat sexual diseases and control birth rate, in Samahni valley (A.K.) Pakistan. The most of these plants grow wild (55.55%), are indigenous (61.11%) and herbs (52.77%). The plant parts frequently used are seed (22.72 %), root (20.45%), fruit, leaf and whole plant (9.09%) each. Medications are mostly prepared as decoctions and infusions. Most of curative species reported here are directed to control family size and treat sexual diseases; syphilis, leucorrhoea, menorrhagia, amenorrhoea, blennorrhoea, haemorrhoids, hydrocoele and regularise menses. The results of this study showed that people are still dependent on medicinal plants in this rural area of Samahni valley. The study enlightens how data of ethnomedicinal inventory of medicinal plants can be used effectively at local and regional level for phytochemical and pharmacological research. The study area due to unplanned exploitation had resulted in loss of medicinally important plant species. It was concluded that afforestation programme followed by proper protection is need of time.
  M.Y. Habib , M.S. Islam , M.A. Awal and M.A. Khan
  A research work of herbal medicine viz. Neem leaf extract (Azadirachta indica), nayantara leaf extract (Catharanthus roseus) and bitter melon fruit (Momordica charantia) juice with the patent drug gliclazide (Comprid®, Square Pharmaceuticals Bangladesh Ltd.) were studied on blood glucose level, hematological parameters and on body weight in rats. Twenty-five apparently healthy adult rats were randomly divided into 5 equal groups namely A, B, C, D and E. One group (group A) was kept as control. The rest four groups (B, C, D and E) of rats were treated with gliclazide (Comprid®) @ 4.5 mg/kg bd. wt./day, neem leaf extract (NLE) @ 500 mg/kg bd. wt/day, nayantara leave extract (NtLE) @ 500mg/kg bd. wt./day and bitter melon fruit juice @ 500 mg/kg b. wt./day respectively for 14 consecutive days. Blood glucose levels were significantly (P<0.01) reduced in all treated four groups of rats (39.78-44.31%) in comparison to their pre-treatment values. Total erythrocyte count (TEC), total leukocyte count (TLC) and differential leukocyte count (DLC) were not changed significantly in any treated group (B, C, D & E). Eosinophil and monocytes and hemoglobin contents were decreased significantly (P<0.01) in all groups. Among the herbal drugs used in the study bitter melon fruit juice was more effective (7.45%) in increasing the body weight in comparison with other herbal preparations i.e. NtLE (7.4%) and NLE (4.86%). From the present study, it may be further revealed that although the patent drug gliclazide was found to be highly effective, as blood glucose lowering agent, but the efficacy of three different combined form of herbal preparations was also seemed to be encouraging.
  S. Bhardwaj , A.K. Mishra , N.K. Kaushik and M.A. Khan
  A newer catalyst was investigated as a catalyst for oxidative coupling of coumarin with propenyl phenols and alkene substrates. This resulted in dimerization of the two through C-O-C linkage yielding some novel coumarinolignanoids. These were characterized by elemental analysis, FT-IR, 1H NMR spectral studies. The rate of reaction was enhanced significantly there by decreasing the overall time of reaction and good product yield was also obtained.
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