Wyniki wyszukiwania - BazTech

Ograniczanie wyników

2 2016

Znaleziono wyników: 2

Liczba wyników na stronie

Wyniki wyszukiwania

Wyszukiwano:
w słowach kluczowych: genetic erosion

Sortuj według:

Ogranicz wyniki do:

Agricultural Biodiversity for Sustainable Development

Krajewski P.

Problemy Ekorozwoju

2016

Vol. 11, nr 1

135--141

Agricultural biodiversity should be considered as a key resource and the most important human heritage. Biodiversity of farm animals and plants gives the foundation to food production that ensures the existence and future of contemporary civilizations. Rapid economic development, unfortunately, does not facilitate the preservation of biodiversity and organisms characterised by many desirable properties and features are perishing. Economic progress forces humans to abandon traditional, safe and more varied species, and to switch to monocultures and those non-native to specific habitats, but which are more productive. In this way mankind had lost forever a large part of this living deposit of the past times, and this process continues. Probably, in some cases, this results simply from the pure ignorance of local keepers concerning traditional varieties and breeds. Therefore, it is worth promoting and encouraging the efforts of both individuals and institutions in terms of a better understanding of this subject, and to seek support in the interests of present and future mankind.

Bioróżnorodność rolną należy traktować jako podstawowy zasób i najważniejsze dziedzictwo ludzkości. Na zróżnicowaniu biologicznym hodowanych zwierząt i roślin opiera się produkcja żywności zapewniająca byt i przyszłość współczesnym cywilizacjom. Gwałtowny rozwój gospodarczy niestety nie sprzyja utrzymywaniu bogactwa form. Znikają zatem organizmy kryjące w sobie wiele pożądanych właściwości i cech. Progres ekonomiczny zmusza do porzucania tradycyjnych, bezpiecznych i bardziej zróżnicowanych gatunków na rzecz ujednoliconych i obcych danemu miejscu, ale bardziej wydajnych. W ten sposób bezpowrotnie ludzkość utraciła już sporą część tego żywego depozytu przeszłości i wyzbywa się go nadal. Prawdopodobnie, w niektórych wypadkach, wynika to po prostu ze zwykłej niewiedzy depozytariuszy lokalnych i tradycyjnych odmian czy ras. Warto zatem propagować i promować wysiłki zarówno ludzi jak i instytucji zmierzające do pogłębienia wiedzy na ten temat oraz szukania wsparcia w interesie dzisiejszego i przyszłego człowieka.

Identifying an efficient bacterial species and its genetic erosion for arsenic bioremediation of gold mining soil

Neeratanaphan L., Tanee T., Tanomtong A., Tengjaroenkul B.

Archives of Environmental Protection

2016

Vol. 42, no. 3

58--66

To improve bioremediation of arsenic (As) contamination in soil, the use of microorganisms to efficiently reduce As and their assessment of genetic erosion by DNA damage using genomic template stability (GTS) evaluation and using RAPD markers were investigated. The five sites examined for microorganisms and contaminated soils were collected from affected gold mining areas. The highest As concentration in gold mining soil is 0.72 mg/kg. Microorganism strains isolated from the gold mining soil samples were tested for As removal capacity. Two bacterial isolates were identified by 16S rRNA gene sequence analysis and morphological characteristics as Brevibacillus reuszeri and Rhodococcus sp. The ability to treat As in nutrient agar (NA) at 1,600 mg/L and contaminated soil samples at 0.72 mg/kg was measured at 168 h, revealing more efficient As removal by B. reuszeri than Rhodococcus sp. (96.67% and 94.17%, respectively). Both species have the capacity to remove As, but B. reuszeri shows improved growth compared to the Rhodococcus sp. B. reuszeri might be suitable for adaptation and use in As treatment. The results are in agreement with their genetic erosion values, with B. reuszeri showing very little genetic erosion (12.46%) of culture in As concentrations as high as 1,600 mg/L, whereas 82.54% genetic erosion occurred in the Rhodococcus sp., suggesting that Rhodococcus sp. would not survive at this level of genetic erosion. Therefore, B. reuszeri has a high efficiency and can be used for soil As treatment, as it is capable to tolerate a concentration of 0.72 mg/kg and as high as 1,600 mg/L in NA.