Design, calibration, and application of a cryogenic low-background infrared radiometer for spectral irradiance and radiance measurements from 4 µm to 20 µm wavelength.

We have constructed, calibrated, and tested a cryogenic low-background infrared radiometer for both spectral radiance and irradiance measurements over the 4 µm to 20 µm wavelength range. The primary purpose of the Missile Defense Transfer Radiometer (MDXR) is to measure absolute irradiance or radiance from cryogenic infrared test chamber sources using a photoconductive Si:As Blocked Impurity Band (BIB) detector and a set of spectral filters. The MDXR also includes an absolute cryogenic radiometer (ACR) and a Fourier transform spectrometer (FTS). For irradiance measurements, the ACR is used to provide the primary power scale for the BIB detector in conjunction with spectral filters, while the FTS/BIB configuration derives its scale from an internal blackbody source. The two measurement scales show agreement for the irradiance of highly collimated (< 1 mrad) infrared beams from 10-13 W/µm/cm2 to 10-8 W/µm/cm2 within the combined relative uncertainties of 2.6 % (coverage factor k = 1.) We have also calibrated the radiometer for radiance measurements by using a large cavity fluid bath blackbody that overfills the spatial and angular extent of the radiometer entrance pupil. The radiometric calibration uncertainty analysis of the radiometer as well as its maintenance and stability are discussed.

Successful integration of nonclinical and clinical findings in interpreting the clinical relevance of rodent neoplasia with a new chemical entity.

Canagliflozin, a sodium glucose co-transporter 2 (SGLT2) inhibitor, has been developed for the treatment of adults with type 2 diabetes mellitus (T2DM). During the phase 3 program, treatment-related pheochromocytomas, renal tubular tumors, and testicular Leydig cell tumors were reported in the 2-year rat toxicology study. Treatment-related tumors were not seen in the 2-year mouse study. A cross-functional, mechanism-based approach was undertaken to determine whether the mechanisms responsible for tumorigenesis in the rat were of relevance to humans. Based on findings from nonclinical and clinical studies, the treatment-related tumors observed in rats were not deemed to be of clinical relevance. Here, we describe the scientific and regulatory journey from learning of the 2-year rat study findings to the approval of canagliflozin for the treatment of T2DM.

Telephone-based, cognitive-behavioral therapy for African American dementia caregivers with depression: initial findings.

OBJECTIVES: Discuss initial findings of a randomized clinical trial comparing the effects of telephone-based and face-to-face (f-to-f) cognitive-behavioral therapy (CBT) on changes in caregiver (CG) burden, assistance support, depression, and health status for African American (AA) CGs with depression. DESIGN: Pilot study using a prepost, two-group design with 14 enrolled and randomized participants. MEASURES: Subjective Burden subscale of the Caregiver Appraisal Inventory, Assistance Support subscale of the Interpersonal Support Evaluation List, Physical Symptoms subscale of the Caregiver Health and Health Behavior Inventory and the Center for Epidemiologic Studies Depression Scale. RESULTS: Prepost improvements were found on 11 completers across all measures for both telephone and f-to-f CBT. Moderate and similar effects sizes for CG subjective burden and assistance support were found for both the telephone and f-to-f groups. Effect sizes for physical symptoms and depression varied from low to moderate, respectively, with a trend toward smaller improvements in f-to-f CBT than in telephone CBT. Qualitative analysis highlighted CGs' perceptions of the active ingredients of treatment and provided indirect support for similar gains in emotional and psychosocial functioning across the two treatment modalities. CONCLUSIONS: Both telephone-based and f-to-f CBT showed improvements in depression, subjective burden, and assistance support in dementia AA CGs. Replication with a larger sample size (N = 106) is currently in progress. Study limitations and future directions for research are also addressed.

NIST High Accuracy Reference Reflectometer-Spectrophotometer.

A new reflectometer-spectrophotometer has been designed and constructed using state-of-the-art technology to enhance optical properties of materials measurements over the ultraviolet, visible, and near-infrared (UV-Vis-NIR) wavelength range (200 nm to 2500 nm). The instrument, Spectral Tri-function Automated Reference Reflectometer (STARR), is capable of measuring specular and diffuse reflectance, bidirectional reflectance distribution function (BRDF) of diffuse samples, and both diffuse and non-diffuse transmittance. Samples up to 30 cm by 30 cm can be measured. The instrument and its characterization are described.