Field-Based Planetary Protection Operations for Melt Probes: Validation of Clean Access into the Blood Falls, Antarctica, Englacial Ecosystem.

Subglacial environments on Earth offer important analogs to Ocean World targets in our solar system. These unique microbial ecosystems remain understudied due to the challenges of access through thick glacial ice (tens to hundreds of meters). Additionally, sub-ice collections must be conducted in a clean manner to ensure sample integrity for downstream microbiological and geochemical analyses. We describe the field-based cleaning of a melt probe that was used to collect brine samples from within a glacier conduit at Blood Falls, Antarctica, for geomicrobiological studies. We used a thermoelectric melting probe called the IceMole that was designed to be minimally invasive in that the logistical requirements in support of drilling operations were small and the probe could be cleaned, even in a remote field setting, so as to minimize potential contamination. In our study, the exterior bioburden on the IceMole was reduced to levels measured in most clean rooms, and below that of the ice surrounding our sampling target. Potential microbial contaminants were identified during the cleaning process; however, very few were detected in the final englacial sample collected with the IceMole and were present in extremely low abundances (∼0.063% of 16S rRNA gene amplicon sequences). This cleaning protocol can help minimize contamination when working in remote field locations, support microbiological sampling of terrestrial subglacial environments using melting probes, and help inform planetary protection challenges for Ocean World analog mission concepts.

Evaluation of drug dependence treatment in VA hospitals.

A nationwide evaluation of 49 Veterans Administration drug dependence treatment programs was conducted using a sample of 1,655 patients. Their status with reference to seven treatment goals was assessed at admission and again 11 months later to determine change. The following changes were observed: a large decrease in heroin use; a small increase in the use of alcohol; moderate decline of involvement in the drug culture; moderate increase in psychological well-being; and small increase in economic independence. No statistically significant changes were observed in frequency of arrests, in establishment of stable living arrangements, in drug related medical problems, or in the ability to relate to other people. Implications of the findings for further research and program modification are discussed.