A novel combined electrochemical-magnetic method for water treatment

Electrocoagulation (EC) is a wastewater treatment process in which aqueous pollutants can be removed by adsorption, entrapment, precipitation or coalescence during a coagulation step produced by electrochemically generated metallic species. When using Fe as the sacrificial electrode, Fe(2+) and Fe(3+) ions are formed. As Fe(3+) species are paramagnetic, this property can in principle be used to facilitate their removal through the application of a magnetic field. In the present work we present a proof-of-concept for a combined electrochemical-magnetic method for pollutant removal. For this approach, the amounts of Fe(2+) and Fe(3+) produced in an EC cell at various voltages were measured by spectroscopic methods to confirm that Fe(3+) species predominate (up to 84%). The effectiveness of the presence of a magnetic field in the precipitation of coagulants from a suspension was confirmed by monitoring the turbidity change versus time with and without exposure to a magnetic field, up to a 30% improvement.     

A comparison of pyrrolidide and picolinyl ester derivatives for the identification of fatty acids in natural samples by gas chromatography-mass spectrometry

The pyrrolidide and picolinyl ester derivatives of the fatty acids in two natural lipid samples rich in unsaturated fatty acids, pig testis lipids and cod liver oil were satisfactorily resolved on capillary columns of fused silica coated with stationary phases of varying polarity. The picolinyl esters, in particular, when subjected to gas chromatography-mass spectrometry on a column containing a cross-linked methyl silicone, gave distinctive mass spectra, which could be interpreted in terms of both the numbers and positions of the double bonds.     

Effects of supervision in the training of nonprofessional crisis-intervention counselors.

Evaluated 3 major models currently used by crisis intervention centers to train and supervise nonprofessional counselors. Training groups included preservice training only (PSO), preservice training and delayed supervision (PSD), and preservice training and immediate supervision (PSI). The 4 nonprofessional counselors in each group saw actual clients of a walk-in clinic and were compared on (a) pattern and timing of interventions, (b) self-evaluations of their interview performance, and (c) client evaluations of treatment received. Except for explicit empathy, the groups did not differ in frequencies of counselor statements. Across time periods, only PSI counselors' response patterns began to approximate those of experienced crisis counselors. PSI patterns began to approximate those of experienced crisis counselors. PSI counselors rated their interview performances most positively, followed by PSD and then PSO counselors. Clients reported greatest satisfaction with treatment received from PSI counselors. Findings indicate that most of the learning by nonprofessionals occurs during ongoing supervision. The practice of relying on pretraining may promote harmful outcomes for volunteers and may account for the common problem of high staff attrition. (17 ref) (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Effects of consciousness-raising groups on measures of feminism, self-esteem, and social desirability.

34 female undergraduates in 2 consciousness-raising groups were objectively assessed to determine whether changes relating to self-reported profeminist attitudes and behaviors and relating to self-esteem and social desirability would occur. 22 Ss were randomly assigned to either a 16-hr marathon group format or a 2-hr, 8-wk time-spaced group format. 12 additional Ss who took objective measures at the same time as 1 of the 2 groups acted as no-treatment controls. All experimental Ss significantly shifted toward more self-reported profeminist attitudes and behaviors both at posttesting and at follow-up. Two personality measures did not reveal any lasting changes. When compared with each other, Ss in the 2 time formats did not evidence any significant differences. When compared with control Ss, time-spaced Ss reported significantly more profeminist behavioral changes and an increase in self-esteem. Marathon Ss were significantly different from controls on a profeminist attitude measure (Attitudes Toward Women Scale). The purpose for which consciousness-raising groups have been formed was empirically supported by desired changes reported by Ss in relation to more profeminist attitudes and behaviors. Whether participation in consciousness-raising groups produces increases in self-esteem and decreases in the need for social approval is in need of further assessment. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Death at a discount: how the tobacco industry thwarted tobacco control policies in US military commissaries

Background

The US military is perhaps the only retailer consistently losing money on tobacco. Military stores (commissaries and exchanges) have long sold discount‐priced cigarettes, while the Department of Defense (DoD) pays directly for tobacco‐related healthcare costs of many current and former customers. Tobacco use also impairs short‐term troop readiness.

Objective

To examine the long struggle to raise commissary tobacco prices and the tobacco industry''s role in this policy effort.

Methods

Analysis of internal tobacco industry documents, searches of government and military websites and newspaper databases, and interviews with key informants identified in the documents.

Results

Efforts to raise commissary tobacco prices began in the mid‐1980s. Opposition quickly emerged. Some military officials viewed tobacco use as a “right” and low prices as a “benefit”. Others raised issues of authority, and some saw the change as threatening the stores. The tobacco industry successfully exploited complex relationships among the Congress, the DoD, commissaries, exchanges and private industry, obstructing change for over a decade. Leadership from the Secretary and Assistant Secretaries of Defense, presidential support and procedural manoeuvring finally resulted in a modest price increase in 1996, but even then, high‐level military officials were apparently threatened with retaliation from pro‐tobacco Congressmen.

Conclusions

The longstanding military tradition of cheap cigarettes persists because of the politics of the military sales system, the perception within the military of tobacco use as a right, and tobacco industry pressures. Against its own best interests, the US military still makes tobacco available to service members at prices below those in the civilian sector.The US military includes 1.4 million active duty personnel, stationed worldwide. Their smoking prevalence is higher (33.8% in 2002) than the US Department of Defense (DoD) goal of ⩽20%,¹ exceeding the civilian rate of 23.6%.² Smoking diminishes even short‐term troop health and readiness^3,4 and increases medical and training costs.^5,6 As an authoritarian, hierarchical institution, DoD should, theoretically, be able to establish and implement strong tobacco control policies. Nonetheless, DoD sells its personnel tobacco products virtually tax free. Military health personnel and some members of Congress have long sought to address this contradiction. This case study shows how for more than a decade, the tobacco industry worked to defeat policy changes by framing cheap cigarettes as a “benefit”, mobilising Congressional and military‐affiliated allies, and exploiting DoD ambivalence about tobacco.     

Storage stability of liver oil from two ray (Rhinoptera bonasus and Aetobatus narinari) species from the Gulf of Mexico

The effect of storage time on the quality of liver oil from two commercial rajiform species (Rhinoptera bonasus and Aetobatus narinari) captured in the Gulf of Mexico (State of Campeche coast line) was evaluated. Oil characterisation was conducted by physical (specific gravity, saponification index and water content) and chemical analyses (fatty acid content, carotenes and tocopherols) whilst storage stability (peroxide value, free fatty acids, conjugated dienes, anisidine value and changes in docosahexaenoic acid, DHA and content) was studied for 87 days at 25 °C. Increases (p < 0.05) in free fatty acids, conjugated dienes, peroxide value and anisidine value, and a decrease (p < 0.05) in DHA were observed during the storage time for both oil species as oxidation proceeded. It was concluded that R. bonasus and A. narinari oils lasted for 52 and 66 days under these storage conditions, respectively.