Data from: Biogeographic and anthropogenic correlates of Aleutian Islands plant diversity: a machine-learning approach

This is the first comprehensive analysis of vascular plant diversity patterns in the Aleutian Islands to identify and quantify the impact of Aleutian Island distance dispersal barriers, geographical, ecological and anthropogenic factors. Data from public Open Access databases, printed floristic accounts, and from collections made by the primary author were used to develop an Aleutian floristic database. The most common plant distribution pattern was ‘an eastern origin community’, though it compared similarly to the ‘Western’ and ‘Widespread’ distribution pattern. We established an ecological plant community composition class for each island, based on clustering species assemblage dissimilarity measurements (Jaccard Index), and a measurement of phylogenetic dissimilarity (UniFrac). We modelled these composition classes and species richness values in non-parametric algorithmic models and concepts (data cloning using machine learning, stochastic boosting- TreeNet,) based on classic and Aleutians-specific island biogeography hypotheses. Plant species richness is strongly associated with the equilibrium model variables of area and island isolation, as well as distance to the Alaska Peninsula, and island total stream length. Species composition is strongly associated with the landmass groups during the last glacial maximum, maximum island elevation, island isolation and island area. Phylogenetic composition is associated with island area, distance from the islands to the Chukotka Peninsula, maximum island elevation, island geologic age, and island isolation. This study extends the equilibrium theory of island biogeography by including additional drivers of diversity during the Anthropocene, such as the landmass during the LGM, as well as factors that may be related to anthropogenic extinction rate

Comparative Studies on the Effects of Various Combined-Chemotherapy in the Experimental Tuberculosis

この論文は国立情報学研究所の学術雑誌公開支援事業により電子化されました。海の実験的前眼部結核症を対象として, 30週間にわたつてSM-PAS, INH-SI, INH-PZA, INH-PASの2者併用療法を施行し順序を交替して投与したのと, 終始一貫, SM-INH週2日-PAS毎日の3者併用療法を施行し, その効果を比較検討したことに就いては既に報告したが, 本篇においては各臓器の定量培養により検出された結核菌に就いて, SM, PAS及びINHに対する耐性検査を行なつた。其の結果2者併用療法を交替させた群では耐性の発現は軽度であつた。しかしSM-PAS⟶INH-PASと言う風にPASを終始使用した例では, 主剤を交替しても比較的耐性の発現は高度であつた。3者併用(S_2I_2P毎)を行なつた群ではその中間の成績であつた。併しINHに対する耐性獲得はすべての治療群に殆んど認める事が出来なかつた