The density related properties of igneous (dunite and gabbro) and sedimentary (limestone) rocks are measured at room temperature and normal pressure, using ASTM Standards. Dunite samples are taken from Chillas near Gilgit and gabbro samples from Warsik near Peshawar, both of these places are located in north of Pakistan. The limestones are taken from Nammal Gorge sections, Western Salt Range, Pakistan. The thermal properties are determined using the well known transient plane source (TPS) technique. The thermal parameters of dunite are measured in temperature range from 83K to 483K, using air as saturant in pore spaces. The thermal properties of gabbro samples are reported using air as well as water as saturants in pore spaces at room temperature where as the thermal properties of limestones are measured in temperature range from 293K to 443K. All of the measurements on thermal parameters are carried out at normal pressure. Precise measurements on thermal conductivity are difficult to conduct and are very time consuming. Consequently, a lot of work is done on the prediction of effective thermal conductivity of porous media. To become a part of these efforts, an empirical model is proposed, as given below: 1 λ e = 1 λ s + mΦ λ f Where λ e is the effective thermal conductivity, λ f is the thermal conductivity of fluid in pore spaces, λ s is the thermal conductivity of solid phase, Φ is the fractional porosity and m is the empirical coefficient whose value can be determined by the method of least squares. The results of this proposal are compared with the existing models and the corresponding improvements are reported.⎛ 1 ⎞ Using the concept that thermal resistivity ⎜ ⎟ is a linear function of temperature, the ⎝ λ ⎠ above model is then extended to involve the effect of temperature, given as: 1 λ e = 1 λ s + mΦ ⎛ T ⎜ λ f ⎜ ⎝ T o ⎞ ⎟ ⎟ , ⎠ where T o is certain reference temperature. An exponential decay trial is also given for the prediction of effective thermal conductivity of porous media under ambient conditions, as: λ e = λ s e − zΦ λ s λ f , where z is the empirical coefficient. This formula is tested on gabbro samples with air and water as fluids in pore spaces. The results of this relation are again compared with the results obtained from the existing models and the corresponding variations are discussed.
اردو کے نامور محققین(بابائے اردومولوی عبدالحق) مولوی عبدا لحق برِ صغیر پاک ہند کے عظیم اردو مفکر، محقق، ماہر لسانیات، معلم، بانی انجمن ترقی اردو اور اردو کالج کے بانی تھے، ا?پ کو بابائے اردو کے لقب سے یاد کیا جاتا ہے۔آپ کی تاریخ پیدائش کے حوالے سے کافی اختلاف پایا جاتا ہے ،لیکن بقول ممتاز حسین مولوی عبدالحق 20 اپریل،1870ء کوبرطانوی ہندوستان کے ضلع میرٹھ کے ہاپوڑ کے قریب سراوہ نامی ایک گاؤں میں پیدا ہوئے۔مولوی عبدالحق نے ابتدائی تعلیم گھر پر ہوئی پھر میرٹھ میں پڑھتے رہے۔ بابائے اْردومولوی عبدالحق کو ابتدا ء ہی میں ریاضی سے گہرا لگاؤ تھا جس نے اْنہیں غور و فکر اور مشاہدے کا عادی بنا دیا۔اس کے علاوہ انہیں فارسی اور اْردو شاعری، نثرنگاری ،تاریخ ،فلسفہ اور مذہب کا مطالعہ کرنے کا بھی شوق تھا ان علوم اور ادب کے مطالعے نے مولوی عبدالحق? کے قلب و ذہن پر مثبت اثرات مرتب کئے انہیں اپنے اطراف سے گہری دلچسپی پیدا ہوئی۔ بابائے اْردو مولوی عبدالحق نے نہ صرف اْردو میں تنقید نگاری، مقدمہ نگاری اور معنویت عطا کی بلکہ اْردو میں پہلی بار حقیقی تبصرہ، جائزہ اور لسانی اکتساب صرف بابائے اْردو مولوی عبدالحق کی مقدمہ نگاری میں میسر آیا انہوں نے اْردو میں تبصرہ نگاری کو ایک نیا رنگ اور ڈھنگ عطا کیا۔جنوری 1902ء میں آل انڈیا محمڈن ایجوکیشن کانفرنس علی گڑھ کے تحت ایک علمی شعبہ قائم کیا گیا جس کانام انجمن ترقی اردو تھا۔ مولانا شبلی نعمانی اس کے سیکرٹری رہے تھے۔ عزیز مرزا کے بعد 1912ء میں مولوی عبدالحق سیکرٹری منتخب ہوئے جنھوں نے بہت جلد انجمن ترقی اردو کو ایک فعال ترین علمی ادارہ بنا دیا۔ مولوی عبدالحق اورنگ آباد (دکن ) میں ملازم تھے ،وہ انجمن کو اپنے ساتھ لے گئے اور اس طرح حیدر آباد دکن اس کا مرکز بن گیا۔
NAC transcription factors are considered as main family of transcriptional regulators in plants. NAC gene family members play significant contribution in regulating transcriptional reprogramming in plants related to plant stress response. These proteins possess highly conserved DNA binding domains and play a diverse functions in several plants. NAC gene is related to several stress factors including biotic and abiotic factors. NAC transcription factors controls several interrelated processes and their protein products can function as negative or positive regulators in many cellular processes. These regulatory functions are also controlled by NAC proteins such as auto and cross regulation. These regulatory proteins are regarded as a central regulator for the interaction of phytohormones in various stress signaling pathways. This review highlights the role of NAC transcription factors in modulating gene expression and their role in various biotic and abiotic stress tolerance in plants.
Present study was conducted during four seasons of the year, 2008 namely winter (December to February), spring (March to April), summer (May to September) and autumn (October to November). The study was divided into two phases; in first phase a questionnaire survey was conducted on traditional management system of camels and climatic data was collected from three ecological zones under study (Faisalabad, Bhakkar and Attock). In second phase, total 24 mature healthy male camels were used for recording seasonal and ecological changes in the behavior, ultrasonographic structure and biometry of testis and serum biochemistry (steroid hormones and some minerals) at all the zones. Biopsy sampling was done from the camels kept at Faisalabad zone (n=12; 6 in each breeding and non-breeding season) for ultastructural investigations, and slaughterhouse sampling (n=24; 6 sample in each season of the year) was done for morphometrical studies. The period of sexual activity started earlier in November and extended more even up to April at Attk as compared to other zones. Male camels used for breeding even up to 20 years of age at Attk zone. Duration of copulation was up to even 35 min at Attk zone, so it can be derived that the males of Attk zone are more efficient in reproduction as compared to FSD and Bkkr. The degree of most of rutting behavioral signs varies among different seasons and climate of the location. Some behavioral signs were observed as more extensive at Attk and then Bkkr zone as compared to the FSD, in the autumn (October, November) and spring seasons of the year, which revealed that the rutting season started earlier at these locations (Attk and Bkkr) and extended even up to the start of the summer at Attk zone. Biometric studies showed significantly (P<0.01) higher scrotal length and width of the testis during winter and spring season as compared to summer and autumn. Ultrasonographic imaging showed, the parenchyma of the testis as homogenous and moderate echogenic, the testicular capsule was appeared as thick hyper-echoic structure and tunics were identified as hyperechoic lines in both longitudinal and transverse planes, covering the parenchyma. A thin intratunical anechoic linear area was identified, because of fluid between the connective tissue coverings. Mediastinum was visualized as hyperechoic central line in the longitudinal section and a central hyperechoic circular area in transverse plane of the testis. Season had a prominent noticeable effect on the ultrasonic picture of the testis and epididymis at all the experimental zones. Serum testosterone was higher (P<0.01) during the winter season atChapter 2: Review of literature 30 all ecological zones under study, it started decreasing during spring and reached baseline during summer, maintained almost same during autumn at FSD zone however increased again in autumn at Attk and Bkkr zones. This increased level in autumn season was more at Attk as compared to Bkkr zone. Serum estradiol 17- β was higher (P<0.01) during the cooler months including January, February at all the ecological zones, it started declining in the month of March, April and May, little increased level was observed in the month of June but again sloped down in July and remained on baseline in the months of August, September, October and November. Serum concentrations of calcium, iron, sodium and chloride were higher (P<0.01) during the winter and spring as compared to other seasons of the year, while vice versa was true for the serum potassium, as it was recorded as significantly higher during the summer season. Serum testosterone, estradiol, calcium, iron, sodium and chloride were negatively correlated with the average environmental temperature and rainfall while positively correlated with the relative humidity and vice versa for serum potassium levels with some regional variations among different zones. Morphometrical studies showed that the volume, weight of the testis, average diameter of Sertoli cells, volume of intertubular compartment, relative volume of Leydig cells (VLc %), total volume of Leydig cells (TVLc × 10 12 μm 3 ), numbers of Leydig cells ×10 9 per testis and % intertubular tissue in the parenchyma of testis, were significantly (P<0.01) higher during the winter and spring seasons as compared to summer and autumn. However, % area occupied by the seminiferous tubules, % seminiferous tubule / interstitium, and the volume occupied by the seminiferous tubules and diameter of seminiferous tubules were recorded as significantly (P<0.01) higher during summer and autumn as compared to winter and spring seasons. Ultrastructural studies showed highly active Leydig and Sertoli cells during breeding season of camels (cytoplasm was having abundant and developed smooth endoplasmic reticulum (SER), more oval to elongate mitochondria and few fat droplets) and vice versa during the non-breeding season.