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Developing a deeper insight into reproductive biomarkers
Wahid, Braira,Bashir, Hamid,Bilal, Muhammad,Wahid, Khansa,Sumrin, Aleena The Korean Society for Reproductive Medicine 2017 Clinical and Experimental Reproductive Medicine Vol.44 No.4
The development of biomarkers of reproductive medicine is still in its infancy because many black boxes are still present in reproductive medicine. Novel approaches to human infertility diagnostics and treatment must be developed because reproductive medicine has lagged behind in the implementation of biomarkers in clinical medicine. Despite the dearth of the available literature, the current rapid pace of publications suggests that this gap will soon be filled therefore; this review is a $pr\acute{e}cis$ of the research that has been done so far and will provide a basis for the development of biomarkers in reproductive medicine.
Study on Microstructure and Mechanical Properties of Laser Welded AlMg7 Alloy Thin Sheets
Wahid Muhamad Furkon,이광진 대한용접·접합학회 2021 대한용접학회 특별강연 및 학술발표대회 개요집 Vol.2021 No.5
Laser welding has been used commonly for welding aluminum alloys in the various industry, because a low localized heat input and high welding speeds can be produced with small distortion of welded assemblies. In this study, non-heat-treatable alloys of AlMg7 thin sheets were laser-welded with various welding powers of 1.50, 1.75, and 2.00 kW and travelling speeds of 8, 9, 10, and 11 mpm. The cross-sectional observation on these various lap joints were conducted using optical microscope (OM) and electron back-scatter diffraction (EBSD) in order to investigate the microstructures including the melting pool, heat affected zone (HAZ), and base metals (BM) regions. The tensile test was performed to evaluate the mechanical properties of lap-joints of AlMg7 thin sheets and find the optimum welding conditions. The sound joints with high tensile strength have been affected with their microstructures after laser welding will be elaborated in detail.
CORRELATION BETWEEN TESTICLE MEASUREMENTS AND LIBIDO AND SEMEN QUALITY IN RAMS
Wahid, S.A.,Yunus, J.M. Asian Australasian Association of Animal Productio 1994 Animal Bioscience Vol.7 No.2
A study was conducted at Ijok, Malaysia, to determine the relationship of testicular measurements with libido and semen quality in tropical and imported temperate breeds of sheep. Ten rams each of Malin (M), Siamese Longtail (L), Cross of Merino with Border Leicester (C), Dorset (D) and Suffolk (S) were used for the study. Libido, semen volume and semen quality were recorded monthly for a year together with testicular length, width and circumference. The results showed that there were breed differences in volume and quality of semen where the tropical breeds had better semen compared to the temperate breeds. There was positive and significant correlation between testicle length and semen volume in all the breeds. Testicular length was found to be positively and significantly correlated with motility and sperm concentration in the tropical breeds (L and M). The relationship between libido and testicle measurements in the tropical breeds was not significant (p<0.05). There was variable relationship between the testicular measurements and libido in the temperate breeds where the relationship was significant and negative in breeds C and D and highly significant and positive in S. It was evident that the long testicles influenced the quality of the semen whereas testicles with greater circumference influenced the libido of the rams.
Wahid Muhamad Furkon,문상돈,강성욱,김재황,이광진 대한용접·접합학회 2021 대한용접학회 특별강연 및 학술발표대회 개요집 Vol.2021 No.5
Friction Stir Welding (FSW) has been used recently to improve the weld-ability and productivity on aluminum alloys compared to the fusion welding process. Although the FSW process can avoid the defect and porosity formation, the softening on friction stir welded-joints affects the mechanical properties. A heat-treatment after friction stir welding, known as post-weld heat treatment (PWHT), can improve the mechanical properties especially on the heat-treatable alloys by precipitation hardening mechanisms. In this study, the FSW T-joint of AA6063 extrusion plates were prepared with 1000, 1200, and 1400 of rotational speeds and 40, 60, and 80 mm/min. of travelling speeds. Furthermore, PWHT was conducted at 150°C with various holding times such as 6h, 12h, 18h, 24h, and 30h. Base metal (BM), heat-affected zone (HAZ), thermo-mechanically affected zone (TMAZ), and stir zone (SZ) regions were observed under optical microscope (OM), field emission - scanning electron microscope (FE-SEM) and high-resolution transmission electron microscope (HR-TEM). Tensile tests and hardness tests were performed to evaluate the mechanical properties of T-joints.
Expression of CYP1A1 and GSTP1 in Human Brain Tumor Tissues in Pakistan
Wahid, Mussarat,Mahjabeen, Ishrat,Baig, Ruqia Mehmood,Kayani, Mahmood Akhtar Asian Pacific Journal of Cancer Prevention 2013 Asian Pacific journal of cancer prevention Vol.14 No.12
Most of the exogenous and endogenous chemical compounds are metabolized by enzymes of xenobiotic processing pathways, including the phase I cytochrome p450 species. Carcinogens and their metabolites are generally detoxified by phase II enzymes like glutathione-S-transferases (GST). The balance of enzymes determines whether metabolic activation of pro-carcinogens or inactivation of carcinogens occurs. Under certain conditions, deregulated expression of xenobiotic enzymes may also convert endogenous substrates to metabolites that can facilitate DNA adduct formation and ultimately lead to cancer development. In this study, we aimed to test the association between deregulation of metabolizing genes and brain tumorigenesis. The expression profile of metabolizing genes CYP1A1 and GSTP1 was therefore studied in a cohort of 36 brain tumor patients and controls using Western blotting. In a second part of the study we analyzed protein expression of GSTs in the same study cohort by ELISA. CYP1A1 expression was found to be significantly high (p<0.001) in brain tumor as compared to the normal tissues, with ~4 fold (OR=4, 95%CI=0.43-37) increase in some cases. In contrast, the expression of GSTP1 was found to be significantly low in brain tumor tissues as compared to the controls (p<0.02). This down regulation was significantly higher (OR=0.05, 95%CI=0.006-0.51; p<0.007) in certain grades of lesions. Furthermore, GSTs levels were significantly down-regulated (p<0.014) in brain tumor patients compared to controls. Statistically significant decrease in GST levels was observed in the more advanced lesions (III-IV, p<0.005) as compared to the early tissue grades (I-II). Thus, altered expression of these xenobiotic metabolizing genes may be involved in brain tumor development in Pakistani population. Investigation of expression of these genes may provide information not only for the prediction of individual cancer risk but also for the prevention of cancer.
A COMPARATIVE STUDY OF GRAZING BEHAVIOUR OF TEDDY GOATS VERSUS THALLI SHEEP
Wahid, A.,Hanjra, S.H.,Iqbal, A.,Raza, S.H. Asian Australasian Association of Animal Productio 1992 Animal Bioscience Vol.5 No.4
Experiment involved range vegetation classified into three major classes: Xerophytic trees, shrubs and grasses. Among them samples of major plant species were collected and analysed for chemical composition. The experimental animals 20 each of Thalli sheep and Teddy goats, located at Livestock Experiment Station Rakh Kharewala district Layyah (Pakistan) were randomly drawn from the main flock. The grazing pattern data were collected from one animal of each species. The observations regarding the grazing behaviour, breeding efficiency and carcass quality were also determined. It was found that overall preference index of Teddy goats were higher for Khabble (Cynodon dactylon) indicated by percent of the total number of bites made on different plant species, while the bites on Lumb (Aristida plumose), Mahabbat booti (Cenchrus biflorus), Dhaman (Cenchrus ciliaris) and Karera (Elionorus hirsutus) were found to be 1.28, 6.74, 0.32 and 3.87 percents. The browsing species as a whole were utilized more during the draught period. Among the grasses, sheep heavily utilized Khabble grass, with overall bite percentage of 89.27. Within browsing species Wan (Salvadora oleoides) and wind fallen dry leaves of Wan were considerably picked by the sheep showing 1.19 and 3.49 overall bite percentage respectively. The overall daily growth rates & dressing percentage for Teddy goats and Thalli sheep were 48.33, 39.00 and 51.00, 46.00 percent respectively. Moreover, among the experimental animals 50 percent goats exhibited signs of oestrus where as none of the sheep came into heat during the study period.
Friction stir welding for high-strength AA7075-T6 rolled sheets
Wahid Muhamad Furkon,김강석,이광진 대한용접·접합학회 2021 대한용접학회 특별강연 및 학술발표대회 개요집 Vol.2021 No.11
Friction Stir Welding (FSW) had been conducted to butt-joint the AA7075-T6 rolled sheets with various rotational speed and travelling speed ranging from 800 to 1200 revolutions per minute (RPM) and 50 to 250 millimeters per minute (mm/min), respectively. The joining defects were observed on the external regions (e.g. flash, cracks, and tunnel cavities) and in the internal regions (e.g. voids, cracks). Moreover, tensile test, hardness test, and impact test were performed to determine the mechanical properties of the joints. Among those FSW conditions, the heat-process windows were established for each of the examination results. Therefore, the optimum FSW conditions were chosen based on the best for all examination results. The further investigation has been proceed by post-weld heat treatment (PWHT) the joints with the optimum FSW condition. It was found that the ultimate tensile strength of as-welded specimen was similar to the as-PWHT specimens. Additionally, the similar “W”-pattern of hardness distributions were observed between as-welded and as-PWHT.