In the earlier plublicationi concerninig the effect of CO., oni pliotophosphorylationi (3) a seasonal variationi in the CO, enhanicemiient w-as also described. The CO., enhanicenment wvas much greater w-hen determined wvith chloroplasts from wvinter-growvn oats thani stummlier grown oats. This variation in the response to CO. was a hinderance to further experimlenital stuidy of the effect, so a...

Sr. Editor. El comienzo del año 2010 estuvo marcado en muchos países de América Latina por el impacto de una fuerte anomalía climática, cuantificada por la National Oceanographic and Atmospheric Administration (NOAA) de EUA, como un fuerte El Niño (Strong El Niño), con valores del ONI (Oceanic Niño Index) (promedio de la anomalía de la temperatura de la superficie del mar en la región 3,4 del N...

Althouglh there have been many studies on effects of light on over-all elongation of various plant organs, relatively little is known concerning effects of light oni the pattern of elongation within a given organ. i.e., the relative contributions of various portions of the organ to the total elongation. In this study, intact wheat coleoptiles were marked with fildia ink to permit an investigati...

Rivers can absorb certain amounts of contamination relying on different factors such as: river discharge, the primary conditions of the river, the river depth, discharge and the river viscosity of the offloaded wastes in the river. From parameters of water quality point of view, it is recom-mended to determine some parts of the river which are lower than the standard level in order to find out ...

Clostridium perfringens (CP) and sulphite reducing clostridia (SRC) densities in the Selangor River, Bernam River and Tengi River Canal were examined between April 2007 and January 2008. Water samples were taken from two or three locations along each river, using either depth-integration or grab sampling methods. The downstream sampling site of the Selangor River, Rantau Panjang, reported the h...

The paper presents the state-of-the-art in flood forecasting and simulation applied to a river flood analysis and risk prediction. Different water flow forecasting and river simulation models are analysed. An advanced river flood forecasting and modelling approach developed within the ongoing project INFROM is described. It provides an integrated procedure for river flow forecasting and simulat...

introduction the khoshk river is originated from golestan and ghalat highlands and flow in a northwest and southeast direction. after traversing a short distance it covers golestan and dukohak from the right and the ghasr ghomshe tributary from the left. then, in a direct cross from the middle of shiraz metro police, it will divide it into half in south and east and at the end it will pour into...

We compared the values of the biomass, chemical composition and nutritive value of the emergent aquatic macrophyte S. alterniflora in a river affected by the discharge of domestic sewage (Guaú River) and in an unpolluted river (Itanhaém River). S. alterniflora, water and sediment samples were obtained in the two rivers in November, 2001. The Guaú River presented the highest levels of Total-N an...

The Illinois River is one of the major tributaries of the Mississippi River in the central United States with a drainage area of 75,156 square kilometers. The Illinois River connects the Great Lakes with the Mississippi River through the Illinois Waterway that consists of eight lock and dams along the Illinois River and its tributaries. Because of its central location in the state and being the...

It is generally assumed in plant nutrition that an essential element is essential for all plants, though the amounts required may be appreciably different. Thus, the need for boron is shown within 3 to 4 days by the necrosis of sunflower, tomato, or tobacco tissue, but requires at least 3 weeks in soybeans. The suggestion (3) that boron was required for differentiation rather than cell division...