United States Tennis Association

About: United States Tennis Association is a based out in . It is known for research contribution in the topics: Population & Bifidobacterium. The organization has 152 authors who have published 114 publications receiving 1353 citations. The organization is also known as: USTA & United States Lawn Tennis Association.

Diabetes mellitus and periodontal diseases

Abstract: Opinions on the interdependence between diabetes mellitus and oral periodontal disease are controversial. Experimental and clinical investigations carried out so far have not brought unique results. General objective of our research is to investigate on the strictly defined group of subjects aged 35-44 with diabetes mellitus type I the influence of metabolic control HbA1C on changes of periodontium and other organs. According to duration of diabetes mellitus the patients are divided into subdecade and postdecade groups. This group consists of 56 patients out of which 33 patients are with subdecade and 23 with postdecade insulin-dependent diabetes mellitus. In this group periodontal pocket depths, gingival index, number of extracted teeth and the volume of nonstimulated saliva are measured in comparison with a control group. The incidence of oral diseases and complications in other organs of insulin-dependent patients in subdecade and postdecade period are also examined and recorded. Periodontal diabetic disease is verified by pathohistological findings. Values of HbA1C in either subdecade or postdecade group with diabetes mellitus are above normal values. Values of periodontal pocket depths as well as the values of gingival index are substantially greater at insulin-dependent diabetes mellitus patients compared to the control group.

Determination of arsenic levels in lake water, sediment, and foodstuff from selected area of Sindh, Pakistan: estimation of daily dietary intake.

Abstract: The aim of present study was to develop a database of arsenic (As) in lake water, ground water, sediment, soil, vegetables, grain crops and fish to evaluate the potential human health risks posed by higher level of As, in south east part of Sindh, Pakistan during 2005–2007. The total concentration of As in various samples under study was determined by electrothermal atomic absorption spectrophotometry (ETAAS). The reliability and accuracy of technique was checked by different certified reference materials. The concentration of As in lake and ground water samples exceeded the WHO guideline values. The concentration of As in lake sediment and agricultural soil samples ranged between 11.3–55.8 and 8.7–46.2 mg/kg while acid soluble As (acetic acid 0.11 mol/L) was observed in the range of 1.48–3.54 and 0.34–3.78 mg/kg, respectively. It was observed that the leafy vegetables (spinach, coriander and peppermint) contain higher As levels (0.90–1.20 mg/kg) as compared to ground vegetables (0.048–0.25) and grain crops (0.248–0.367 mg/kg) on dried weight basis. The estimated daily intake of total As in the diet was 9.7–12.2 μg/kg body weight/day.

Evaluation of arsenic and other physico-chemical parameters of surface and ground water of Jamshoro, Pakistan

Abstract: Arsenic contamination in water has caused severe health problems around the world. The purpose of this study was to evaluate the geological and anthropogenic aspects of As pollution in surface and groundwater resources of Jamshoro Sindh, Pakistan. Hydride generator atomic absorption spectrophotometry (HG-AAS) is employed for the determination of arsenic in water samples, with detection limit of 0.02 microg l(-1). Arsenic concentrations in surface and underground water range from 3.0 to 50.0, and 13 to 106 microg l(-1), respectively. In most of the water samples As levels exceeded the WHO provisional guideline values 10 microg l(-1). The high level of As in under study area may be due to widespread water logging from Indus river irrigation system which causes high saturation of salts in this semi-arid region and lead to enrichment of As in shallow groundwater. Among the physico-chemical parameters, electrical conductivity, Na(+), K(+), and SO(4)(2-) were found to be higher in surface and ground water, while elevated levels of Ca(2+) and Cl(-) were detected only in ground water than WHO permissible limit. The high level of iron was observed in ground water, which is a possible source of As enrichment in the study area. The multivariate technique (cluster analysis) was used for the elucidation of high, medium and low As contaminated areas. It may be concluded that As originate from coal combustion at brick factories and power generation plants, and it was mobilized promotionally by the alkaline nature of the understudy groundwater samples.

Speciation and evaluation of Arsenic in surface water and groundwater samples: a multivariate case study.

Abstract: The principal object of the current study was to estimate total arsenic and its inorganic speciation in different origins of surface water (n=480) and groundwater (n=240) of Sindh, Pakistan. This study provided a description based on the evaluation of physico-chemical parameters of collected water samples and possible distribution of As with respect to its speciation. The concentration of total inorganic As (iAs) and its species (As3+ and As5+) for the surface and underground water was reported in terms of basic statistical parameters, principal component analysis, cluster analysis, metal-to-metal correlations and linear regression analyses. The chemical correlations were observed by PCA, which were used to classify the samples by CA, based on the PCA scores. Standard addition method confirmed the accuracy; the recoveries of As3+ and iAs were found to be >98%. The concentration of As5+ in the water samples was calculated by the difference of the total inorganic arsenic and As3+. The results revealed that the groundwater of the understudied area was more contaminated as compared to the surface water samples. The mean concentration of As3+ and As5+ in the surface water and groundwater samples were in the range 3.0 to 18.3 and 8.74–352 μg/L, respectively.

Analysis of Heavy Metals in Scalp Hair Samples of Hypertensive Patients by Conventional and Microwave Digestion Methods

Abstract: The abnormal metabolism of metal ions plays an important role in health and disease conditions, and studies about them have been attracting significant interest. The aim of our study was to assess the heavy metals (cadmium, copper, iron, nickel, chromium, lead, and zinc) in scalp hair samples of 200 hypertensive (HT) patients of an urban population together with 215 non‐hypertensive male subjects in the age group of 30–60 years. Hair samples were digested with conventional wet ashing and microwave digestion. Analyses of both digests were done by flame and graphite furnace atomic absorption spectrometry. The validity of methodology was checked by use of the certified reference material (CRM 397) hair, provided the Community Bureau of Reference, Commission of the European Communities. According to a statistical evaluation of the results, the microwave digestion method was a valid alternative to the conventional acid digestion method, p value >0.05, but it gave a faster digestion. The overall metal ...