Risk of Gastrointestinal Disease Associated with Exposure to Pathogens in the Water of the Lower Passaic River

During precipitation events, untreated human sewage is often intentionally discharged to surface water bodies via combined sewer overflow (CSO) systems in order to avoid overloading wastewater treatment plants. The purpose of this analysis was to evaluate the risk of pathogen-related disease associated with CSO discharges into the Lower Passaic River. Concentrations of fecal coliform, total coliform, fecal Streptococcus, and fecal Enterococcus bacteria were measured at six river locations on six different days in 2003 (n = 36). In addition, water samples (n = 2) were collected directly from and in the immediate vicinity of a discharging CSO in Newark, NJ. These samples were analyzed for fecal coliforms, total coliforms, fecal Streptococcus, fecal Enterococcus, Giardia lamblia, Cryptosporidium parvum, and several viruses. Risk estimates for gastrointestinal illness and Giardia infection resulting from indirect and direct ingestion of contaminated water were calculated for three potential exposure scenarios: visitor, recreator, and homeless person. Single-event risk was first evaluated for the three individual exposure scenarios; overall risk was then determined over a 1-year period. Monte Carlo techniques were used to characterize uncertainty. Nearly all of the pathogen concentrations measured in the Passaic River exceeded health-based water quality criteria and in some cases were similar to levels reported for raw sewage. The probability of contracting gastrointestinal illness due to fecal Streptococcus and Enterococcus from incidental ingestion of water over the course of a year ranged from 0.14 to nearly 0.70 for the visitor and recreator scenarios, respectively. For the homeless person exposure scenario, the risk for gastrointestinal illness reached 0.88 for fecal Streptococcus and Enterococcus, while the probability of Giardia infection was 1.0. This risk analysis suggests that, due to the levels of pathogens present in the Lower Passaic River, contact with the water poses, and will continue to pose, significant human health risks until CSO discharges are adequately controlled or abated.     

Health-Based Criteria for Sediment Disposal Options: A Case Study of the Port of New York/New Jersey

Approximately 4 million cubic yards of sediment are dredged annually from the Port of New York and New Jersey in order to maintain navigable channels. In many cases, the sediments contain elevated levels of numerous contaminants. The New York District of the U.S. Army Corps of Engineers and U.S. Environmental Protection Agency Region II employ a framework of sediment quality evaluation to determine whether contaminated sediments are suitable for open ocean disposal (i.e., do not pose a health risk from bioaccumulation in human food chain) or whether more extensive and costly disposal methods are required. The degree to which chemicals can bioaccumulate from sediments into benthic invertebrates is a key determinant in the permitting decision. The maximally “acceptable” levels of bioaccumulation (bioaccumulation criteria) have been developed over a period of several years, using a variety of different methods. We reviewed the technical bases of these criteria and found that, while some values can be considered “risk-based,” others are based on historical background concentrations, Food and Drug Administration Action Levels, limits of detection, and other non-“risk-based” methodologies. Hence, the degree of uncertainty and health protection (or lack thereof) in the criteria varies considerably among the chemicals. We also reviewed the outcomes of several permit applications and found that the bioaccumulation criteria were not applied consistently. We propose the following refinements to the decision-making process: (1) bioaccumulation screening values based only upon risk-based criteria, using a single method that is applied for all chemicals; (2) increased consistency in decision-making and considerations of site-specific information where appropriate; and (3) assured availability of testing results for review and analysis by interested parties.     

Enhancement of immunoblot sensitivity by heating of hydrated filters

Immunoblots of either dot or Western type were exposed to heat before reaction with antibody. Dramatic increases in immunoblot sensitivity were seen for certain antigen-antibody pairs after heating of either dry or hydrated nitrocellulose filters at or above 100 degrees C. Heating of filters in the hydrated state improved the linearity of immunodetection and produced the highest signal-to-noise ratio. This treatment greatly increased immunoblot sensitivity with several peptide-generated antibodies, whereas decreased sensitivity was seen with antibodies against native proteins. Heating of hydrated filters after antigen immobilization is thus a potentially powerful way to increase the sensitivity of immunoblot analysis for antibodies that preferentially recognize epitopes in denatured proteins.     

The 1952 Outbreak of Encephalitis in California (A Symposium): LONG TERM NEUROLOGIC AND PSYCHIATRIC STUDIES OF SEQUELAE

For fuller understanding of the nature of infectious encephalitis, continuing study must be made of patients with regard to possible neurological sequelae or aberrations in behavior.The large outbreak of encephalitis in California in 1952 having offered opportunity for follow-up observation of a large series of patients, many of them children who had convulsions during the acute phase of the disease, pilot studies already have been started and funds are being sought for extending the scope of the investigation over a period of years.In early observations of patients included in the pilot study, changes in emotional and behavior patterns were noted in some instances. Thus far, with the exception of two infants who had recurrence of convulsions, patients who recovered apparently free of residual effects have remained so.Further neurological and psychiatric investigation should be carried out.     

NMR analysis of cardiac troponin C-troponin I complexes: effects of phosphorylation.

Phosphorylation of the cardiac specific amino-terminus of troponin I has been demonstrated to reduce the Ca2+ affinity of the cardiac troponin C regulatory site. Recombinant N-terminal cardiac troponin I proteins, cardiac troponin I(33-80), cardiac troponin I(1-80), cardiac troponin I(1-80)DD and cardiac troponin I(1-80)pp, phosphorylated by protein kinase A, were used to form stable binary complexes with recombinant cardiac troponin C. Cardiac troponin I(1-80)DD, having phosphorylated Ser residues mutated to Asp, provided a stable mimetic of the phosphorylated state. In all complexes, the N-terminal domain of cardiac troponin I primarily makes contact with the C-terminal domain of cardiac troponin C. The nonphosphorylated cardiac specific amino-terminus, cardiac troponin I(1-80), was found to make additional interactions with the N-terminal domain of cardiac troponin C.