Catalytic Reduction of Molybdenum-Thiol Complexes

The enzyme nitrogenase which converts atmospheric nitrogen into ammonia and other nitrogeneous cell components in microorganisms has been studied intensely in recent years. Chemical models have been reported. Molybdenum and thiols (especially cysteine) are known to be essential components of nitrogenase. This work attempts to survey chemical complexes that can catalytically reduce Mo-thiol complexes electrochemically at the dropping mercury electrode (DME). The research includes the study of Mo(VI)cysteine, Mo(VI)-thioglycerol, Mo(V)-cysteine, Eu(III)-EDTA, Eu(III)l, 2-diamino-propane-N,N,N\u27 ,N\u27-tetraacetic acid, Fe(III)-EDTA, hexammine cobalt(III) chloride, tris-(ethylenediamine)-cobalt(III) chloride, and tris-(ethylenediamine)-chromium(III) sulfate

The Case of TEFON OILDFIELD SERVICES Ltd Cameroon

The main objective of this study is to examine the role of accounting information system in a company. Data for this study were collected from both primary and secondary sources. Primary data was collected through structured questionnaires, in- depth interview and sometimes personal questioning out of curiosity. Secondary date was obtained from records in the Administration and Finance department, Human resource department, shipping department, operations department, and the resulting data was analyzed using a simple table and percentages. The results show that accounting information system has a vital role in TEFON OILDFIELD Services Ltd Company (Case study). The various functions of decision making, planning, control, data analysis, communication, and reporting were amongst. Again from the findings, it can be seen that the system will become more effective and productive if the other departments could use it for data analysis. However, this can only be possible if all other departments not just the accounting and finance departments fully understand the system and can use it without any difficulty. My results certainly shown that very little is known on the Accounting Information systems as propounded by my findings and also in the accounting department of Tefon. They certainly agree it is very important but almost inexistent in Tefon.BscBusiness AdministrationV

Physiological Predictors of Increasing Total and Central Adiposity in Aging Men and Women

BACKGROUND: Increasing levels of total and central body fat with advancing age contribute to the development of cardiovascular and metabolic disease. We examined gender-related differences and physiological predictors of the rate of increase in total and central body fat in men and women. METHODS: We studied 427 healthy men (age range, 17 to 90 years) and 293 women (age range, 18 to 88 years). We measured body fatness by hydrostatic weighing, central adiposity from the waist circumference, peak volume of oxygen utilization (V̇O2) from a treadmill test, leisure time physical activity (LTA) from a questionnaire, resting metabolic rate and respiratory quotient from indirect calorimetry, and energy intake from 3-day food diaries. RESULTS: Fat mass increased with age, and the rate was greater in women (r=.61; slope=0.25 kg/y; P<.01) than in men (r=.43; slope=0.16 kg/y; P<.01). Increasing fat mass in men and women was most strongly associated with declines in peak V̇O2 and LTA. Controlling for these variables reduced the increase in fat mass from 17% to 3% per decade in men and from 26% to 5% per decade in women. The increase in waist circumference with age was also greater in women (r=.53; slope=0.28 cm/y) than in men (r=.39; slope=0.18 cm/y; P<.01). Increasing waist circumference with age in men and women was most strongly associated with declines in LTA and peak V̇O2, respectively. Control for these variables reduced the age-related increase in waist circumference from 2% to 1% per decade in men and from 4% to 1% per decade in women. We observed no independent contribution of resting metabolic rate, respiratory quotient, menopause status, energy, or macronutrient intake to the age-related increase in fat mass and waist circumference. CONCLUSIONS: Our findings suggest that (1) the age-related increase in fat mass and waist circumference is greater in women than in men and (2) the physiological characteristics that reflect a decline in physical activity—related energy expenditure, rather than resting energy expenditure, are important predictors of the increases in total and central fatness. Lifestyle changes that increase the level of physical activity may be advantageous in blunting age-related increases in total and central body fatness.(Arch Intern Med. 1995;155:2443-2448