Wyniki wyszukiwania

Wyszukiwano:
w słowach kluczowych: biological stress

Sortuj według:

Ogranicz wyniki do:

Artykuł dostępny w postaci pełnego tekstu - kliknij by otworzyć plik

Nutrient flux fuels the summer primary productivity in the oligotrophic waters of the Gulf of Aqaba, Red Sea

100%

Badran M. I., Rasheed M., Manasrah R., Al-Najjar T.

Oceanologia

2005

tom 47

nr 1

The thermohaline characteristics of the Gulf of Aqaba, Red Sea, depict a welldefined seasonal pattern of winter mixing from December to April and summer stratification from May to November. This thermohaline structure is a major controlling factor of the nutrient, chlorophyll a and primary productivity seasonal cycles. The nitrate and chlorophyll a concentration records generated down to 200 m at a vertical resolution of 25 m – weekly during 1994, 1995 and every two weeks from April 1997 through to December 2000 – are employed to assess the nitrogen flux across the summer thermocline of the Gulf of Aqaba. The flux calculations are based on a simple diffusion model that incorporates the physical stress eddy diffusivity factor Kz and a biological stress factor k. Both Kz and k are calculated using the Michaelis-Menten equation and the nitrate concentration gradient. The total nitrate flux of the Gulf of Aqaba during the seven summer months (May–November) is estimated at 0.52 moleN m−2. In relation to established primary productivity values (75.5 gC m−2 (May November)−1) and the generated chlorophyll a records, this yields an f fraction of new to total primary production of 0.50. This relatively high f value is discussed with respect to the geophysical characteristics of the Gulf of Aqaba and similar oceanic basins. The remaining 50% is accounted for by cross-sectional flow from the relatively nutrientrich coral reef coastal habitat and rapid recycling, triggered by high irradiance and water temperature.

Soft tissue integration in the neck area of titanium implants - an animal trial

80%

Allegrini S. J., Allegrini M. R. F., Yoshimoto M., Konig B.,Jr, Mai R., Fanghanel J., Gedrange T.

Journal of Physiology and Pharmacology. Supplement

2008

tom 59

nr 5

117-132

Ograniczanie wyników

1 Journal of Physiology and Pharmacology. Supplement

1 Oceanologia

1 Al-Najjar T.

1 Allegrini M. R. F.

1 Allegrini S. J.

1 Badran M. I.

1 Fanghanel J.

1 Gedrange T.

1 Konig B.,Jr

1 Mai R.

1 Manasrah R.

1 Rasheed M.

1 Yoshimoto M.

1 2008

1 2005

Wyniki wyszukiwania

Nutrient flux fuels the summer primary productivity in the oligotrophic waters of the Gulf of Aqaba, Red Sea

Soft tissue integration in the neck area of titanium implants - an animal trial