Tolerance of three fungal species to lithium and cobalt: Implications for bioleaching of spent rechargeable Li-ion batteries.

AIMS: This paper aims to quantify the growth and organic acid production of Aspergillus niger, Penicillium chrysogenum and Penicillium simplicissimum when these fungi are exposed to varying levels of lithium (Li) and cobalt (Co). The study also tests whether pre-exposing the fungi to these metals enables the fungi to develop tolerance to Li or Co. METHODS AND RESULTS: When cultures of A. niger, P. chrysogenum or P. simplicissimum were exposed to 250 mg l-1 of Li or Co, biomass production and excretion of organic acids were significantly inhibited after 5 days of growth compared to cultures grown in the absence of these metals. Pre-exposing cultures of A. niger to 250 mg l-1 of Li or Co for 20 days significantly increased biomass production when the fungus was subsequently sub-cultured into 250 or 500 mg l-1 of Li or Co. However, pre-exposure of P. chrysogenum or P. simplicissimum to 250 mg l-1 of Li or Co for 20 days did not increase biomass production. CONCLUSIONS: Aspergillus niger, but not the Penicillium species, developed tolerance to Li and to Co during the 20-day pre-exposure period. Therefore, processes that utilize fungal bioleaching with A. niger to mobilize and recover valuable metals such as Li or Co should consider a pre-exposure step for fungi to improve their tolerance to metal toxicity. SIGNIFICANCE AND IMPACT OF THE STUDY: Fungi may have the ability to extract valuable metals such as Li and Co from spent rechargeable batteries. However, the toxicity of the extracted metals can inhibit fungal growth and organic acid production. Pre-exposure to metals may alleviate toxicity for some fungal species. This knowledge can be used to improve the design of bioleaching protocols, increasing the potential for fungal bioleaching to become an economical and environmentally friendly method of recovering Li and Co from spent batteries.

Can Brief Email Guidance Enhance the Effects of an Internet Intervention for People with Problematic Alcohol Use? A Randomized Controlled Trial.

BACKGROUND: Some research suggests that internet interventions aimed at people with problematic alcohol use are more effective when provided with guidance from a therapist or coach. Purpose/Objectives: This trial intended to compare the effects of a previously evaluated internet intervention for people with problematic alcohol use when delivered with or without brief email guidance. Methods: Using online advertising, 238 participants, 18 years or older, were recruited and randomized to receive access to the Internet intervention Alcohol Help Center with or without brief email guidance from a health educator. The guidance consisted of at least four structured, slightly individualized emails delivered during the first two weeks after randomization. Participants were followed up at 3 and 6 months. Results: Number of log-ins did not differ significantly between groups throughout the follow-up period. The follow-up rate at 6 months was 47.0%. Generalized estimating equations run on the primary (standard drinks in preceding week/heavy drinking days in preceding week) and secondary outcome variables (AUDIT, AUDIT-C, quality of life) revealed no significant differences between the interventions on any of the outcomes. Conclusions/Importance: The study does not provide support for any added benefits of providing brief guidance via email in an internet intervention for problem drinkers.

Assessing the immediate impact of normative drinking information using an immediate post-test randomized controlled design: implications for normative feedback interventions?

UNLABELLED: One alternative explanation for the observed impact of normative feedback interventions is that participants who receive normative information will just report reductions in their drinking rather than actually reducing the amount they drink. The current study tested the immediate impact of receiving normative information on self-reports of drinking. METHODS: A random half of participants (39 out of 80) were presented with normative information about college drinking and then asked information about their drinking. Participants in the control condition were not presented with the normative information before answering the questions about their drinking. RESULTS: Risky drinking participants presented with the normative information reported significantly less drinking as compared to those in the control condition (p<.05).

Experimental taphonomy of giant sulphur bacteria: implications for the interpretation of the embryo-like Ediacaran Doushantuo fossils.

The Ediacaran Doushantuo biota has yielded fossils interpreted as eukaryotic organisms, either animal embryos or eukaryotes basal or distantly related to Metazoa. However, the fossils have been interpreted alternatively as giant sulphur bacteria similar to the extant Thiomargarita. To test this hypothesis, living and decayed Thiomargarita were compared with Doushantuo fossils and experimental taphonomic pathways were compared with modern embryos. In the fossils, as in eukaryotic cells, subcellular structures are distributed throughout cell volume; in Thiomargarita, a central vacuole encompasses approximately 98 per cent cell volume. Key features of the fossils, including putative lipid vesicles and nuclei, complex envelope ornament, and ornate outer vesicles are incompatible with living and decay morphologies observed in Thiomargarita. Microbial taphonomy of Thiomargarita also differed from that of embryos. Embryo tissues can be consumed and replaced by bacteria, forming a replica composed of a three-dimensional biofilm, a stable fabric for potential fossilization. Vacuolated Thiomargarita cells collapse easily and do not provide an internal substrate for bacteria. The findings do not support the hypothesis that giant sulphur bacteria are an appropriate interpretative model for the embryo-like Doushantuo fossils. However, sulphur bacteria may have mediated fossil mineralization and may provide a potential bacterial analogue for other macroscopic Precambrian remains.

Baclofen withdrawal: a cause of prolonged fever in the intensive care unit.

We report a case of baclofen withdrawal syndrome resulting from oral baclofen underdosing. A 24-year-old woman with type 1 neurofibromatosis receiving long-term baclofen therapy was admitted with presumed pneumonia which was successfully treated with antibiotics. The patient continued to have fever and autonomic instability without evidence of infection which entirely resolved within 24 hours of reinstitution of full preadmission dosing of oral baclofen. Baclofen withdrawal syndrome resulting from underdosing of oral baclofen should be considered as a potential source of prolonged fever in the intensive care unit.

Using self-help materials to motivate change at assessment for alcohol treatment.

The utility of a brief self-help booklet provided at assessment for alcohol treatment was evaluated using a quasi-experimental design (booklet provided to all clients for one month at a time, interspersed by one month of no booklets, for a 6-month period). While the booklet did not result in any significant reduction in client attrition, clients who received the booklet at their assessment were drinking less by the 6-month follow-up than those who did not receive the booklet. Limitations of this study, including the quasi-experimental design and the impact of the low baseline attrition rates, are discussed.

Impact of normative feedback on problem drinkers: a small-area population study.

OBJECTIVE: As many as one in four adults in North America experiences some problems due to alcohol consumption. Although most of these problem drinkers do not have concerns that are severe enough to merit formal treatment, such drinking has large economic costs and can place the drinker at risk for long-term negative health and social consequences. The present study evaluated a minimal intervention that used normative feedback about population drinking to motivate changes in alcohol use. METHOD: An intervention pamphlet was mailed to over 6,000 households in Toronto, randomized by block from a region containing almost 10,000 households. In the month after the mailing, a general population survey was conducted in the region to assess alcohol use. RESULTS: Respondents from households receiving normative feedback (n = 472) reported significantly lower alcohol use than controls (n = 225), but this effect occurred only among respondents who met an objective criterion for problem drinking and who perceived some risk associated with their drinking. CONCLUSIONS: Viewed from a public health perspective, normative feedback interventions have the potential for a significant payoff because they can be provided at low cost and to problem drinkers who might ordinarily never access any treatment services.

Help-seeking timeline followback for problem drinkers: preliminary comparison with agency records of treatment contacts.

OBJECTIVE: A pilot study assessed the utility of the Timeline Followback (TLFB) method to collect information on help seeking. METHOD: Using the TLFB method, 34 clients (26 men) who had attended at least one session of an outpatient alcohol treatment program reported on treatment contacts, including any supplemental services (e.g., psychiatric care). TLFB reports of help seeking at that agency were compared with agency records of treatment contacts. RESULTS: Clients reported on their help-seeking behavior for a period of approximately 8 months after they had completed an initial assessment for the outpatient treatment. With regard to the number of outpatient sessions they attended, intraclass correlations and equivalence testing showed that the TLFB data were comparable to the agency records of treatment contacts. Analysis of week-to-week correspondence of the presence or absence of help-seeking episodes showed good agreement between TLFB and the agency records for most participants, although there was substantial variation. Degree of correspondence was not associated with the length of the recall period or individual differences (e.g., drinking pattern). Older participants, however, tended to have lower week-to-week concordance than did younger participants. CONCLUSIONS: These data provide preliminary support for the utility of a help-seeking TLFB instrument to assess addiction- and mental health-related contacts. This instrument may be especially useful in research in which collecting temporal patterns of help seeking is of interest (e.g., in studies examining factors influencing the delay in help seeking after relapse).

Enhanced in situ bioremediation of BTEX-contaminated groundwater by combined injection of nitrate and sulfate.

Enhancement of in situ anaerobic biodegradation of BTEX compounds was demonstrated at a petroleum-contaminated aquifer in Seal Beach, CA. Specifically, combined injection of nitrate and sulfate into the contaminated aquifer was used to accelerate BTEX removal as compared to remediation by natural attenuation. An array of multi-level sampling wells was used to monitor the evolution of the in situ spatial distributions of the electron acceptors and the BTEX compounds. Nitrate was utilized preferentially over sulfate and was completely consumed within a horizontal distance of 4-6 m from the injection well; sulfate reduction occurred in the region outside the denitrifying zone. By combining injection of both nitrate and sulfate, the total electron acceptor capacity was enhanced without violating practical considerations that limit the amount of nitrate or sulfate that can be added individually. Degradation of total xylene appears linked to sulfate utilization, indicating another advantage of combined injection versus injection of nitrate alone. Benzene degradation also appears to have been stimulated by the nitrate and sulfate injection close to the injection well but only toward the end of the 15-month demonstration. The results are consistent with the hypothesis that benzene can be biodegraded anaerobically after other preferentially degraded hydrocarbons have been removed.

Alcoholism: beliefs and attitudes among Canadian alcoholism treatment practitioners.

OBJECTIVES: To explore differences in views concerning adjunctive medications and theoretical orientation among Canadian practitioners from different professional backgrounds who treat alcoholism. METHODS: A survey of clinicians from different disciplines was conducted by mail. The response rate was 56%: 95 drug and alcohol counsellors, 46 social workers, 81 nonpsychiatrist addiction physicians, and 74 addiction psychiatrists. The number of items in the questionnaire was reduced using principal component analysis. Group differences were explored using analysis of variance with Bonferroni correction and Scheffé's posthoc comparisons. RESULTS: Physicians and nonphysicians differed in their views on the utility of medications in treating alcohol problems, the disease concept of alcohol problems, and the classification of alcohol abuse or dependence as psychiatric conditions. No group differences emerged on views regarding cognitive-behavioural treatment, pharmacological-only interventions, combined treatment, and recovery without treatment. Psychopathology in the alcoholic was significantly more likely to be considered as secondary to the use of alcohol by nonpsychiatrist physicians. Nonphysician practitioners viewed alcoholic behaviour as self-medication. CONCLUSIONS: Groups differed on questionnaire items concerning medication use and the disease concept of alcoholism. Agreement on several areas may facilitate bridging the gap across disciplines. The implications of these results are discussed.

Disseminated bacille Calmette-Guérin infection in an infant with a novel deletion in the interferon-gamma receptor gene.

Six weeks after receiving BCG vaccination, a Canadian aboriginal infant presented with suspected sepsis, lymphadenopathy and hepatosplenomegaly. Lymph node biopsy revealed macrophages filled with acid-fast bacilli. Mycobacterium bovis was cultured from tissue specimens and there was evidence of concomitant cytomegalovirus disease. The infant died of disseminated BCG infection. A novel deletion at nucleotide 165 in the interferon-gamma receptor (IFN-gammaR1) was identified. The incidence of this mutation in the aboriginal population and the impact on the heterozygous state are unknown.

Hyperlipidemia.

Coronary heart disease (CHD) is prevalent and often related to an unhealthy diet and hyperlipidemia. The diagnosis of hyperlipidemia should be carefully made, using more than one measurement in the manner described. An assessment of risks allows one to decide whom to treat. Patients with CHD should be treated aggressively but it is less clear how aggressive to be with patients without CHD. Diet and exercise recommendations are appropriate for almost all patients. For those for whom the benefit is greater than the potential risks, statins are first-line drug therapy and they appear to have beneficial effects aside from their lipid-lowering properties.

Factors associated with untreated remissions from alcohol abuse or dependence.

This paper describes an epidemiologic-based sample of individuals who remitted from alcohol abuse or alcohol dependence, both with and without treatment, to abstinence or moderate drinking. Inspection of the severity, onset, and duration of alcohol problems experienced by these individuals suggests that there may be two primary categories of drinkers with distinct pathways to remission. The first is a population of individuals who experience significant problems for an extended period of time who then resolve to abstinence through the use of treatment services. The second is a population of individuals who drink heavily at some point in their lives, experience some problems, and then "mature out" of this stage in their life as they age and take on other life roles.

Remissions from drug dependence: is treatment a prerequisite?

The present study investigated the prevalence of untreated drug remissions in a representative sample of respondents who had a lifetime diagnosis of one of five types of illicit drug dependence in the past (cannabis, cocaine/crack, hallucinogens, amphetamines, or heroin) but no diagnosis of drug abuse or dependence in the last year. It was concluded that, among recovered individuals with previous clinically significant drug concerns (as measured using DSM-IV criteria), a substantial proportion had accessed addictions treatment services prior to remission.

Appropriate use of psychotropic drugs in nursing homes.

The Omnibus Budget Reconciliation Act (OBRA) of 1987 limited the use of psychotropic medications in residents of long-term care facilities. Updates of OBRA guidelines have liberalized some dosing restrictions, but documentation of necessity and periodic trials of medication withdrawal are still emphasized. Antidepressant drugs are typically underutilized in nursing homes. Tricyclic antidepressants have many side effects and thus are not preferred medications in elderly patients. Anxiety and insomnia are common problems in the institutionalized elderly. If behavioral measures are not successful, antidepressant medications with shorter half-lives may avoid drug accumulation, which can lead to excessive sedation, cognitive impairment and an increased risk for falls. In the elderly, antipsychotic medications can cause serious side effects, such as extrapyramidal symptoms and tardive dyskinesia. Newer antipsychotic drugs are less often associated with these side effects, but they should be used only for specific diagnoses and when behavioral and environmental measures are unsuccessful.

Providing personalized assessment feedback for problem drinking on the Internet: a pilot project.

OBJECTIVE: This project developed an Internet program that conducts a brief assessment of an individual's drinking habits and then provides normative feedback comparing the user's drinking to that of others of the same gender and age group. The Internet program, "Try Our Free Drinking Evaluation," was based at the Addiction Research Foundation Internet web site (now at http://notes.camh.net/efeed.nsf/ newform). METHOD: A voluntary survey linked to the participant's feedback summary collected respondents' impressions of the program. RESULTS: During the trial period, the site received approximately 500 hits per month. While the feedback was generally well received, the weekly summary format was less credible to those individuals who drink less than once per week or whose consumption varies a great deal over time. CONCLUSIONS: Given these pilot results indicating that there is an audience for Internet-based interventions, the next step is to evaluate whether receiving such personalized feedback materials on the Internet leads to any change in drinking behavior by participants

Enhanced anaerobic bioremediation of groundwater contaminated by fuel hydrocarbons at Seal Beach, California.

Enhanced anaerobic biodegradation of groundwater contaminated by fuel hydrocarbons has been evaluated at a field experiment conducted at the Naval Weapons Station, Seal Beach, California. This experiment included the establishment of three different remediation zones in situ: one zone was augmented with sulfate, one was augmented with sulfate and nitrate, and the third was unaugmented. This enables a comparison of hydrocarbon biodegradation under sulfate-reducing, sequential denitrifying/sulfate-reducing, and methanogenic conditions, respectively. In general, the results from the field experiment are: (1) Certain fuel hydrocarbons were removed preferentially over others, but the order of preference is dependent upon the geochemical conditions; and (2) In the zones that were augmented with sulfate and/or nitrate, the added electron acceptors were consumed quickly, indicating that enhancement via electron acceptor injection accelerates the biodegradation process. More specifically, in the sulfate-reducing zone, sulfate was utilized with an apparent first-order rate coefficient of approximately 0.1 day(-1). In the combined denitrifying/sulfate-reducing zone, nitrate was utilized preferentially over sulfate, with an apparent first-order rate coefficient of 0.1-0.6 day(-1). However, the data suggest that slow sulfate utilization does occur in the presence of nitrate, i.e., the two processes are not strictly sequential. With regard to the aromatic BTEX hydrocarbons, toluene was preferentially removed under intrinsic conditions; biodegradation of benzene was slow if it occurred at all; augmentation with sulfate preferentially stimulated biodegradation of o-xylene; and ethylbenzene appeared recalcitrant under sulfate-reducing conditions but readily degradable under denitrifying conditions.

What is the price of perfection? The hidden costs of using detailed assessment instruments to measure alcohol consumption.

OBJECTIVE: This article describes results from a study investigating the effects of using long assessment instruments on attrition rates in mailed-out surveys. METHOD: Participants were randomly assigned to receive one of two versions of a mailed-out survey; one version incorporated a detailed assessment of drinking using the Timeline Follow back method (TLFB; n = 46) and the other employed a brief graduated frequency measure of alcohol consumption (n = 49). RESULTS: 29% fewer respondents who received the TLFB returned any of their survey materials as compared to those respondents who received just the graduated frequency measure (22% vs 51%). CONCLUSIONS: In some situations, e.g., mailed-out surveys, employing detailed survey instruments may not be justified as the increased respondent burden may result in increased attrition rates.