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Articles by M. Akhtar
Total Records ( 7 ) for M. Akhtar
  M. Akhtar , M. S. Cheema , Moazzam Jamil , Shaukat Ali Shahid and M. Iqbal Shahid
  Study was conducted to evaluate the appropriate sowing time of cotton varieties/cultivars under Bahawalpur conditions. The experiment included four sowing dates started from Ist may up to 16th June, with equal intervals of fifteen days and six varieties viz., V.SLS-1, V.FVH-53, V.BH-118, V.CIM-443, V.CIM-448 with NIAB-Karishma as standard one. Regardless of the varieties/cultivars, the best results were obtained when crop was sown on 16th may. However, cotton varieties NIAB Karishma and BH-118 gave significantly higher weights in a wide range of sowing peirod i.e., from 1st May to 1st June. The highest mean seed cotton yield of 2403 kg ha-1 was obtained when crop was sown on (D2)16th may. Sowing of cotton crop befor or after this sowing date decreased yield of seed cotton significantly.
  M. Akhtar , M. S. Cheema , Moazzam Jamil , M. Rashad Farooq and M. Aslam
  The experiment was conducted to evaluate the maximum yield potential of cotton as effected by plant population for four short statured varieties viz., NIAB-Karishma, NIAB-78, CIM-443 and CIM-448 planted at spacings 10, 20, and 30 cm with rows at 75 cm apart. Maximum seed cotton yield 2657 kg ha-1 was recorded when plant spacing was 30 cm for all the varieties closely followed by 2640 kg ha-1 for the treatment, where plant spacing was 20 cm. The minimum values were obtained at plant spacing of 10 cm.
  M. Akhtar , M. S. Cheema , Liaquat Ali and Moazzam Jamil
  The study was conducted to evaluate the appropriate sowing time of newly evolved wheat varieties/cultivars under Bahawalpur conditions. The study included six sowing dates started from Ist November up to 15th January of year 1997-98 to 1998-99 with equal intervals of fifteen days and seven varieties/cultivars viz; Punjab 96, 95-IB-4173, 7061, MH.97, 92128, 92145 with Inqlab–91 as standard one. Regardless of the varieties /cultivars the best results were obtained when wheat was sown after 15th and before 30th November of year 1997 to 1998. However wheat varieties/cultivars Inqlab-91 and V. 7061 gave significantly higher weights in a wide range of sowing period i.e; 15th November to 15th December. The highest mean grain yield of 4255 kg ha-1 was obtained when crop was sown on 15th November (D2) followed by 4212.84 kg ha-1 for sowing on 30th November (D3).
  M. Aslam , Manzoor Hussain , M. Akhtar , M.S. Cheema and Liaquat Ali
  The study was conducted to evaluate the appropriate sowing time of newly evolved wheat varieties/cultivars under Bahawalpur conditions. The study included 6 sowing dates started form Ist November up to 15th January of year 1999-2000 to 2000-2001 with equal intervals of fifteen days and five varieties/cultivars viz., 2236, 2098, 2219 punjnad-1 with inqlab, 91 as standard one. Regardless of varieties/cultivars the best results were obtained when wheat was sown after Ist and before 15th November of year 1999 to 2000. However wheat variety punjnad-1 gave significantly higher weights in a wide range of sowing period i.e., Ist to 30th November. The highest mean grain yield of 5315 kg ha-1 was obtained when crop was sown on 15th November (D2) followed by 5268 kg ha-1 for sowing on Ist November (D1).
  M.S. Cheema , M. Akhtar and Liaquat Ali
  The study was conducted for two consecutive crop seasons at Agronomic Research Station, Bahawalpur during Rabi 2000-2001 to 2001-2002 to evaluate maximum yield potential of wheat variety punjnad-1 as affected by various seeding rates 75, 100, 125 and 150 kg ha-1 and NPK levels 0-0-0, 100-50-0, 150-100-50 and 200-100-50 kg ha-1. Maximum wheat grain yield of 4293 kg ha-1 was recorded with fertilizer, level of 150-100-50 NPK kg ha-1 with seeding rate of 125 kg ha-1. It was closely followed by same fertilizer level with seeding rate of 100 kg ha-1 by giving 4287 kg grain yield ha-1 which showed that equally good results were obtained with fertilizer dose of 150-100-50 kg ha-1. It showed that higher dose of NPK fertilizer induce more tillering and grain weight in wheat plants under low seed rate which compansate reduction in grin yield. In both seasons increasing fertilizer levels NPK upto 150-100-50 kg ha-1 with seeding rate of 75, 100 and 125 kg ha-1 significantly and linearly enhance wheat grain yield while reduction in yield was obtained beyond this fertilizer dose and seeding rate.
  Amir Zaman Khan , M. Akhtar , R. Ahmad , N. Ahmad and P. Shah
  Protein and oil contents of soybean varieties were significantly affected by planting date and plant density. Late planted crop gave more protein content than early planted crop, while an inverse relationship was found for oil content. Lower plant density of 200 thousand plants ha -1 gave significantly more protein content than higher plant densities of 400 and 600 thousand plants ha -1 and the same response was observed for oil content but the difference among the plant densities did not reach the 5% significance level. Epps produced more protein and oil contents than William-82. There was no effect of plant density on Oil concentration in seeds of William -82, however Oil concentration in seeds of Epps decreased with increase in plant density, indicating differential response of Oil concentration in seeds of the two soybean varieties.
  Q Bashir , N Rashid , F Jamil , T Imanaka and M. Akhtar
 

l-Threonine dehydrogenase, a key enzyme in the l-threonine metabolism, catalyses the NAD+-dependent conversion of l-threonine to 2-amino-3-ketobutyrate, that non-enzymically decarboxylates to aminoacetone. A search of the genome sequence of hyperthermophilic archaeon, Thermococcus kodakaraensis revealed the presence of a closely related orthologue (TK0916) of archaeal and bacterial l-threonine dehydrogenase genes. Expression in Escherichia coli, purification and characterization of the TK0916 gene product revealed that this gene actually coded for a protein with high levels of l-threonine dehydrogenase activity (7.26 U mg–1). The enzyme exhibited highest activity at pH 12 and 90°C. The Km values for l-threonine and NAD+ at 50°C were 1.6 mM and 0.028 mM, respectively. The enzyme activity was dependent on divalent cations. The half-life of the enzyme was more than 2 h at 85°C and 24 min in boiling water. This is the most thermostable threonine dehydrogenase exhibiting optimal activity at the highest pH (12) reported to date. This is the first report on the characterization of a TDH from genus Thermococcus.

 
 
 
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