Pigment biosynthesis in the cyanobacterium, Anacystis nidulans, was examined in the presence of gabaculine (5-amino-1,3-cyclohexadienyl-carboxylic acid). At 20 micromolar, this inhibitor blocked the biosynthesis of both chlorophyll and phycocyanin. Analogs of gabaculine were not effective as inhibitors of chlorophyll or phycocyanin biosynthesis. Iron- and phosphate-deficient cultures were 2- to...

are misleading and likely to lead to faulty ideas in attributing both etiologic causes to the stones, and potential for succesful dissolution. It is now generally agreed that all stones in gallbladders harboring multiple stones are of approximately the same composition. Further, if one plots percent of patients undergoing elective cholecystectomy for biliary pain, but without complications (i.e...

78 female and 31 male Danish gallstone cases found by autopsy were studied. The mass of the gallstone(s) from each patient was recorded and the stones were ground. The content of cholesterol in the mixed material from each patient was determined, using the Liebermann-Burchard reaction. The ratio Gallstone(s) ash mass/Gallstone(s) mass was determined, and where this ratio exceeded 0.10, calcium ...

Calcium is an element that is extremely important in the pathogenesis of gallstones. It is present in bile in large quantities since components of bile bind the calcium avidly. Precipitated calcium salts with the calcium sensitive ions, bilirubinate, carbonate and phosphate are major components of pigment gallstones and are present in high concentrations in the centers and rims of cholesterol g...

Anthropic nutrient enrichment has become a major environmental issue in estuaries around the world, being effluents of wastewater treatment plants (WWTPs) one main causes. Phytoplankton is, together with nutrients, useful indicator for ecological status assessment due to its basal position food chain. The present study aims evaluate immediate effect cessation discharges on conditions and phytop...

Abstract Shading significantly affects rapeseed yield, while reasonable nitrogen (N) application has efficiency gains. However, the functions and mechanisms of N are not fully established for shaded plants. Therefore, we conducted a 2‐year field experiment to study effect on pod wall morphology carbon metabolism rapeseed. Two varieties, three rates (120 [N1], 240 [N2], 360 [N3] kg hm −2 ) two l...

The light-sensing organelle of the vertebrate rod photoreceptor, the outer segment (OS), is a modified cilium containing approximately 1,000 stacked disc membranes that are densely packed with visual pigment rhodopsin. The mammalian OS is renewed every ten days; new discs are assembled at the base of the OS by a poorly understood mechanism. Our results suggest that discs are formed and matured ...

Abstract— The effect of calcination temperature on the morphology of plating sludge generated from waste water treatment plant was studied. This waste was hazardous waste due to high toxic metal content [1]. It must be recovered, reuse or recycled before the process but its properties should determined in order to decide recovery method [2]. Previous researches were shown that this kind of wast...