44 research outputs found

    Freshwater mussels (Bivalvia: Unionidae) from the rising sun (Far East Asia): phylogeny, systematics, and distribution

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    Freshwater mussels (Bivalvia: Unionidae) is a diverse family with around 700 species being widespread in the Northern Hemisphere and Africa. These animals fulfill key ecological functions and provide important services to humans. Unfortunately, populations have declined dramatically over the last century, rendering Unionidae one of the world’s most imperiled taxonomic groups. In Far East Asia (comprising Japan, Korea, and Eastern Russia), conservation actions have been hindered by a lack of basic information on the number, identity, distribution and phylogenetic relationships of species. Available knowledge is restricted to studies on national and sub-national levels. The present study aims to resolve the diversity, biogeography and evolutionary relationships of the Far East Asian Unionidae in a globally comprehensive phylogenetic and systematic context.We reassessed the systematics of all Unionidae species in the region, including newly collected specimens from across Japan, South Korea, and Russia, based on molecular (including molecular species delineation and a COI + 28S phylogeny) and comparative morphological analyses. Biogeographical patterns were then assessed based on available species distribution data from the authors and previous reference works.We revealed that Unionidae species richness in Far East Asia is 30% higher than previously assumed, counting 43 species (41 native + 2 alien) within two Unionidae subfamilies, the Unioninae (32 + 1) and Gonideinae (9 + 1). Four of these species are new to science, i.e. Beringiana gosannensis sp. nov., Beringiana fukuharai sp. nov., Buldowskia kamiyai sp. nov., and Koreosolenaia sitgyensis gen. & sp. nov. We also propose a replacement name for Nodularia sinulata, i.e. Nodularia breviconcha nom. nov. and describe a new tribe (Middendorffinaiini tribe nov.) within the Unioninae subfamily. Biogeographical patterns indicate that this fauna is related to that from China south to Vietnam until the Mekong River basin. The Japanese islands of Honshu, Shikoku, Kyushu, Hokkaido, and the Korean Peninsula were identified as areas of particularly high conservation value, owing to high rates of endemism, diversity and habitat loss. The genetically unique species within the genera Amuranodonta, Obovalis, Koreosolenaia gen. nov., and Middendorffinaia are of high conservation concern

    Association between alkaline phosphatase and hypertension in a rural Japanese population: The Nagasaki Islands study

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    Background: Although serum alkaline phosphatase (ALP) levels have been associated with hypertension, and ALP is known as an enzyme affected by alcohol consumption, no study has been published on the associations between ALP and the risk of hypertension in relation to drinking status.Methods: We conducted a cross-sectional study of 2,681 participants (837 men and 1,846 women) aged 30 to 89 years undergoing a general health check-up to investigate the associations between ALP and hypertension in relation to drinking status.Results: Of the 2,681 participants, 1,549 (514 men and 1,035 women) were diagnosed with hypertension. A sex difference was observed for the relationship between ALP and hypertension. While no significant association was observed for men, the association was significantly positive for women. The multivariable adjusted odds ratio and 95% coincidence interval (CI) of hypertension per increment of 1-log ALP were 0.95 (95% CI: 0.56 to 1.59) for men and 1.57 (95% CI: 1.07 to 2.33) for women. When this analysis was restricted to nondrinkers, a significantly elevated risk of hypertension was observed for men and remained significant for women; that is, 3.32 (95% CI: 1.38 to 8.02) for men and 1.68 (95% CI: 1.11 to 2.55) for women.Conclusion: ALP is associated with hypertension for both male and female nondrinkers, but not for drinkers. For analyses of associations between ALP and blood pressure, alcohol consumption should thus be considered a potential confounder

    Prognostic aspects of hepatocellular carcinoma

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    Onderzoek naar vooruitzichten van leverkanker Hepatocellulair carcinoom (HCC), een kwaadaardige tumor die uitgaat van de levercellen, wordt vaak pas in een laat stadium vastgesteld. Hironori Kusano onderzocht in zijn promotieonderzoek twee factoren die de vooruitzichten van patiënten beïnvloeden, micro-vasculaire invasie (de aanwezigheid van tumorcellen in de kleine bloedvaten) en interferon-therapie. Kusano stelt voorop dat HCC, wereldwijd de zesde meest voorkomende kankersoort met een hoog sterftecijfer, in Nederland relatief weinig voorkomt. HCC komt meestal voor in combinatie met levercirrose, het proces waarin ontstoken levercellen afsterven en vervangen worden door littekenweefsel. Het feit dat HCC in een zieke lever voorkomt beperkt het aantal behandelingsmogelijkheden. Het behandelbeleid van patiënten met HCC is daarom niet alleen gebaseerd op de grootte en het aantal tumoren, maar ook op hoe de lever er aan toe is. De promovendus ontdekte dat microvasculaire invasie in HCC geassocieerd is met toename van het gehalte van enkele groeifactoren in de directe omgeving van de tumor die de vorming van abnormale bloedvaten kunnen stimuleren. In zulke bloedvaten kunnen de tumorcellen beter doordringen. Er zijn tegenwoordig nog geen betrouwbare methoden om microvasculaire invasie preoperatief vast te stellen. Bij veel HCC-patiënten wordt de tumor te laat ontdekt om nog een levertransplantatie uit te kunnen voeren. In het tweede deel van zijn onderzoek onderzocht Kusano daarom de effectiviteit van twee medicijnen in een experimenteel model die samen en afzonderlijk werden toegediend. Omdat de effectiviteit van de verschillende combinaties verschilde, concludeert hij dat er moleculair onderzoek nodig is om te bepalen welke subtype HCC voortaan het beste met welk medicijn behandeld kan worden
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