Tree growth acceleration and expansion of alpine forests: The synergistic effect of atmospheric and edaphic change.

Many forest ecosystems have experienced recent declines in productivity; however, in some alpine regions, tree growth and forest expansion are increasing at marked rates. Dendrochronological analyses at the upper limit of alpine forests in the Tibetan Plateau show a steady increase in tree growth since the early 1900s, which intensified during the 1930s and 1960s, and have reached unprecedented levels since 1760. This recent growth acceleration was observed in small/young and large/old trees and coincided with the establishment of trees outside the forest range, reflecting a connection between the physiological performance of dominant species and shifts in forest distribution. Measurements of stable isotopes (carbon, oxygen, and nitrogen) in tree rings indicate that tree growth has been stimulated by the synergistic effect of rising atmospheric CO2 and a warming-induced increase in water and nutrient availability from thawing permafrost. These findings illustrate the importance of considering soil-plant-atmosphere interactions to understand current and anticipate future changes in productivity and distribution of forest ecosystems

Traditional Chinese medicine: effect on bone marrow and peripheral blood cell counts and enzyme induction

published_or_final_versio

Chloramphenicol succinate a competitive substrate and inhibitor of succinate dehydrogenase: relation to its mechanisms of toxicity

published_or_final_versio

Nitroreduction of chloramphenicol succinate in human bone marrow and blood: a possible mechanism responsible of aplastic anaemia

published_or_final_versio

Cost effective 'planning' in the use of intravenous (IV) cyclosporin

published_or_final_versio

Enzymatic oxidation of chloramphenicol succinate in human bone marrow and liver

published_or_final_versio

A genetic linkage map of cucumber (Cucumis sativus L) combining SRAP and ISSR markers

Sequence-related amplified polymorphism (SRAP) and Inter-simple sequence repeat (ISSR) markers are both simple and efficient maker systems adapted to many crops and for multiple purposes. In this studya genetic map based on SRAP and ISSR markers was constructed for cucumber (Cucumis sativus L.) based on the segregations of SRAP and ISSR markers in 112 plants of F2 population derived from a crossbetween two cucumber inbred lines PW0832 and PW0801. In the investigation of polymorphisms with 50 ISSR primers and 132 SRAP primer combinations, 13 (26%) ISSR primers and 26 (20%) SRAP primer pairs were polymorphic generating a total of 109 polymorphic markers of which 48 were ISSR and 61 were SRAP. The average polymorphic bands were four for ISSR and two for SRAP. All the 109polymorphic markers were scored for segregation of which 86 satisfied the Mandelian segregation ratio of 3:1. These data were used to construct an integrated linkage map for cucumber consisting of 62 loci,distributed in seven linkage groups (LGs) spanning a total of 992.2 cM, with an average distance of 16.0 cM between two adjacent loci. These markers would be very useful tool for marker assisted selection incucumber breeding as well as for studies in quantitative traits

Metabolism of chloramphenicol by human bone marrow

published_or_final_versio

Characterization of Shewanella oneidensis MtrC: a cell-surface decaheme cytochrome involved in respiratory electron transport to extracellular electron acceptors

MtrC is a decaheme c-type cytochrome associated with the outer cell membrane of Fe(III)-respiring species of the Shewanella genus. It is proposed to play a role in anaerobic respiration by mediating electron transfer to extracellular mineral oxides that can serve as terminal electron acceptors. The present work presents the first spectropotentiometric and voltammetric characterization of MtrC, using protein purified from Shewanella oneidensis MR-1. Potentiometric titrations, monitored by UV–vis absorption and electron paramagnetic resonance (EPR) spectroscopy, reveal that the hemes within MtrC titrate over a broad potential range spanning between approximately +100 and approximately -500 mV (vs. the standard hydrogen electrode). Across this potential window the UV–vis absorption spectra are characteristic of low-spin c-type hemes and the EPR spectra reveal broad, complex features that suggest the presence of magnetically spin-coupled low-spin c-hemes. Non-catalytic protein film voltammetry of MtrC demonstrates reversible electrochemistry over a potential window similar to that disclosed spectroscopically. The voltammetry also allows definition of kinetic properties of MtrC in direct electron exchange with a solid electrode surface and during reduction of a model Fe(III) substrate. Taken together, the data provide quantitative information on the potential domain in which MtrC can operate