Nutritional studies of Chara corallina

Physico-chemical analysis of the pond water supporting growth of Chara corallina and of those grown in different culture media in the laboratory conditions have been carried out. The physico-chemical parameters of the water of Napli forest and P.N. Mehra Botanical Garden show that Chara corallina requires less amount of nutrients and the level of pollution is quite low as is evident from the data and standards. The water is clear enough to allow penetration of visibility to its bottom. Napli forest and P.N. Mehra Botanical Garden lack rich diversity which may be attributed to some chemicals released by Chara corallina. In laboratory culture, it is found that Chara corallina can be grown in all three culture media, viz., Allen and Arnon’s medium , Chu-10 medium and BG-11 medium but growth is seen to be the best in Allen and Arnon’s culture medium in comparison with the other two culture media

Assessing the improvement in cement effectiveness by the geometry of implant abutment surface

Aim: The present study was conducted to assess the effect of the topography or surface geometry of implant abutments for their effect on the retentive strength of the prosthesis cemented using zinc phosphate on grooved, sandblasted, and standard machined implant abutments and to compare them. Methods: 12 implant abutments of a similar shape were divided into 3 groups of 4 each having a 6-degree taper and 6mm height. The 3 groups were Group I included standard machined abutments without grooves, Group II included group I abutments sandblasted, and Group III included abutments having prefabricated circumferential grooves. In addition, among these 12 abutments, 4 each were taken to assess the retentive force of zinc phosphate cement. 12 similar cast copings were made to fill the 12 abutments, and were cemented with zinc phosphate. After 6 days of storage in the water bath and thermal cycling, using the tensile testing machine, a retention test was done. Results: Concerning zinc phosphate cement, among three study groups the statistically significant difference was seen with p<0.05.&nbsp

Реологічний аналіз нанобурового розчину на основі TiO2

Передова методологія видобутку з ефективним буровим розчином є обов’язковою вимогою для видобутку нафти і газу з нетрадиційних пластів. Нестабільність стовбура свердловини, корозія, змащування та зменшення різання – це лише деякі з проблем, які існують у традиційних системах бурового розчину. Очікується, що одним із ефективних рішень для вирішення цих проблем у нафтогазовому секторі стане буровий розчин на основі нанотехнологій (n-буровий розчин). У роботі такі реологічні властивості бурового розчину як пластична в’язкість (PV), уявна в’язкість (AV), межа текучості (YP) були виміряні, проаналізовані та порівняні з нанобуровим розчином на основі наночастинок TiO2. Техніко-економічні переваги n-бурового розчину над звичайною рідиною були перевірені та вивчені. Також було проведено відносний аналіз напруги зсуву по відношенню до швидкості зсуву. Оптимальна концентрація наночастинок TiO2 становить 0,1 мас. %/об. % (0,35 г), що покращує PV на 10 %, тоді як значні зміни відображаються в AV та YP.Advance extraction methodology with effective drilling fluid is the compulsory requirement for the production of oil and gas from unconventional reservoirs. Wellbore instability, corrosion, lubrication, and cutting reduction are a few of the problems existing in traditional drilling fluid systems. Nano-based drilling fluid (n-drilling fluid) is expected to be one of the effective solutions to resolve these issues in the oil and gas sector. In this work, the rheological properties like plastic viscosity (PV), apparent viscosity (AV), yield point (YP), etc. of drilling fluid were measured, analyzed, and compared with TiO2 nanoparticles based nano drilling fluid. The technical and economic benefits of n-drilling fluid over normal fluid were inspected and studied. Relative analysis of shear stress with respect to shear rate was also performed. The optimum concentration of TiO2 nanoparticles is found to be 0.1 w. %/v. % (0.35 g) which improves PV by 10 %, while significant changes are depicted in AV and YP

Apolipoprotein B-100 XbaI gene polymorphism in gallbladder cancer

Genetic polymorphisms in the apolipoprotein B (apoB) gene have been reported to be associated with altered serum lipids and susceptibility to cholesterol gallstones (GS). Gallstones are among the well-known risk factors for carcinoma of the gallbladder (GBC). In the present study, the association between the XbaI polymorphism of the apo B gene was examined in patients with GBC and GS and in normal controls in a north Indian population. DNA samples from patients with GBC (n=153), GS (n=117) and healthy subjects (n=137) were analysed for the apoB- XbaI polymorphism by polymerase chain reaction followed by restriction fragment length polymorphism. The genotype X+/- was less frequent in patients with GBC (39.2%) than in those with GS (68.3%) and in normal subjects (66.4%; P<0.00001). In contrast, there was an increase in the homozygous X-/- genotype in patients with GBC (54.9%) as compared with those with GS (23.9%) and normal subjects (25.5%; P<0.00001). The frequency of the X- allele was found to be significantly increased in GBC patients with or without GS (odds ratio=2.3 and 1.7, respectively). We suggest that the apoB-XbaI gene polymorphism confers susceptibility to carcinoma of the gallbladder under specific environmental conditions