Isolation of 16 polymorphic microsatellite markers from an endangered and endemic species, Podocarpus nakaii (Podocarpaceae).

PREMISE OF THE STUDY: Sixteen polymorphic microsatellite markers were isolated and characterized from the endangered evergreen tree Podocarpus nakaii to evaluate the population structure for conservation efforts. METHODS AND RESULTS: Based on a modified amplified fragment length polymorphism and magnetic bead enrichment method, 16 polymorphic primer sets were developed for this endangered insular species. Allele numbers ranged from five to seven, with an observed heterozygosity ranging from 0.29 to 0.88. Most primers were able to amplify DNA from the endemic P. fasciculus and the widely distributed P. macrophyllus var. macrophyllus, P. macrophyllus var. maki, and P. costalis. CONCLUSIONS: The results reported here indicate the usefulness of codominant markers for future studies of the population genetics of P. nakaii. In addition, the markers are useful for further phytogeographic and speciation studies in P. fasciculus, P. macrophyllus var. macrophyllus, and P. macrophyllus var. maki, which are closely related species.

The use of antipsychotics is associated with lower mortality in patients with Alzheimer's disease: A nationwide population-based nested case-control study in Taiwan.

OBJECTIVE: The purpose of this study was to identify the association between antipsychotics and mortality in Alzheimer's disease patients. METHODS: Using the Taiwan National Health Insurance Research Database, 735 newly diagnosed Alzheimer's disease patients aged over 65 years and receiving antipsychotic treatments, and 735 age, sex, physical comorbidity, and entry year with propensity scores, matched control subjects were enrolled and followed for a 10-year period until the end of 2011. Multivariate Cox proportional hazards regression models were used for analysis. RESULTS: The mortality rate was 56% in Alzheimer's disease patients treated with antipsychotics, and 65% in Alzheimer's disease patients not treated with antipsychotics during an average of 5.2 years of follow-up. The use of antipsychotics, typical antipsychotics, and atypical antipsychotics was found to be associated with lower mortality (adjusted hazard ratio=0.66, 95% confidence interval 0.58-0.75; 0.69, 0.60-0.79; 0.56, 0.44-0.71, respectively, all p<0.001). In addition, Alzheimer's disease patients with higher cumulative dose and longer duration of exposure to antipsychotics showed a significantly reduced risk of mortality. Other variables associated with higher risk of mortality included age (adjusted hazard ratio=1.08, 95% confidence interval 1.07-1.09, p<0.001), male gender (1.27, 1.11-1.45, p<0.001), diabetes mellitus (1.30, 1.10-1.54, p<0.01), congestive heart failure (1.54, 1.11-2.12, p<0.01), and stroke (1.23, 1.05-1.44, p<0.01). CONCLUSION: The use of antipsychotics was found to be associated with lower mortality in Alzheimer's disease patients. Moreover, dose and duration response effects were also identified.

Perceived Occupational Stress is associated with Decreased Cortical Activity of the Prefrontal Cortex: A Multichannel Near-infrared Spectroscopy Study.

Despite an increasing number of reports on the associations between chronic occupational stress and structural and functional changes of the brain, the underlying neural correlates of perceived occupational stress is still not clear. Perceived stress reflects the extents to which situations are appraised as stressful at a given point in one's life. Using near-infrared spectroscopy, we investigated the associations between perceived occupational stress and cortical activity over the bilateral frontotemporal regions during a verbal fluency test. Sixty-eight participants (17 men, 51 women), 20-62 years of age were recruited. Perceived occupational stress was measured using the Chinese version of Job Content Questionnaire, and the Chinese version of the Copenhagen Burnout Inventory. We found statistically significant negative associations between occupational burnout and brain cortical activity over the fronto-polar and dorsolateral prefrontal cortex during the VFT (r = -0.343 to -0.464). In conclusion, our research demonstrated a possible neural basis of perceived occupational stress that are distributed across the prefrontal cortex.

Duration of Untreated Psychosis and Brain Function during Verbal Fluency Testing in First-Episode Schizophrenia: A Near-Infrared Spectroscopy Study.

A longer duration of untreated psychosis (DUP) has been associated with poor clinical outcomes in patients with schizophrenia (SZ); however, it remains unclear whether this is due to neurotoxic effects of psychosis. The purpose of this study was to use near-infrared spectroscopy (NIRS) to investigate the influence of DUP on brain function using two verbal fluency tests (VFTs) in patients with first-episode SZ (FES). A total of 28 FES patients and 29 healthy controls (HC) underwent NIRS during VFTs. Group comparisons of cortical activity were made using two-tailed t-tests and the false discovery rate method. We then examined the associations between DUP and hemodynamic changes in each channel to identify any effects of DUP on brain cortical activity. During the letter VFT, the HC group exhibited significantly greater cortical activations over bilateral frontotemporal regions compared to FES patients. However, this distinction was not observed while performing a category version of the VFT. In addition, no associations between DUP and brain cortical activity were observed in the FES group during either VFT. In conclusion, we did not find an association between DUP and frontotemporal cortical activities. This might be because neurodevelopmental disturbances result in neurocognitive deficits long before psychotic symptoms onset.