Long-Term Effects of Aluminum Exposure on Nutrient Uptake by Maize Genotypes Differing in Aluminum Resistance

2005 ◽  
Vol 28 (2) ◽  
pp. 323-333 ◽  
Author(s):  
Eduardo D. Mariano ◽  
Willem G. Keltjens
Keyword(s):  
Nutrient Uptake ◽  
Long Term Effects ◽  
Aluminum Exposure ◽  
Aluminum Resistance ◽  
Maize Genotypes

Long-Term Effects of Sustained Beef Feedlot Manure Application on Soil Nutrients, Corn Silage Yield, and Nutrient Uptake

2005 ◽  
Vol 34 (5) ◽  
pp. 1672-1681 ◽  
Author(s):  
Richard B. Ferguson ◽  
John A. Nienaber ◽  
Roger A. Eigenberg ◽  
Brian L. Woodbury
Keyword(s):  
Nutrient Uptake ◽  
Soil Nutrients ◽  
Corn Silage ◽  
Long Term Effects ◽  
Manure Application ◽  
Beef Feedlot Manure

Long-term effects of fertilizers and integrated nutrient supply systems in intensive cropping on soil fertility, nutrient uptake and yield of rice

1999 ◽  
Vol 133 (4) ◽  
pp. 365-370 ◽  
Author(s):  
SHAIK MOHAMMAD
Keyword(s):  
Nutrient Uptake ◽  
Rainy Season ◽  
Fertilizer Application ◽  
Nutrient Supply ◽  
Recommended Dose ◽  
Available P ◽  
Rice Grain ◽  
Long Term Effects ◽  
Continuous Application

The long-term effect of fertilizers and an integrated nutrient supply system was studied in a rice–rice sequence for 8 years at Hyderabad in India from 1988/89 to 1995/96. Nutrient uptake and seed yield improved with increase in fertilizers up to the recommended dose of 120, 60, 40 kg/ha, N, P2O5 and K2O in the rainy and post-rainy seasons during the 8 years sequence cycles. The soil became enriched in organic carbon (OC) and maintained the available P while K concentration was reduced from medium to low status after 8 years. Integrated nutrient supply by incorporating glyricidia or FYM 15 days before transplanting the rice thereby substituting 25% nitrogen in the rainy season and application of only 75% of the recommended fertilizers in the post-rainy season maintained the overall mean yield at a level equal to that from the continuous application of the recommended fertilizer dose. The practice saved 30 kg N, 15 kg P2O5 and 10 kg K2O/ha in every season and improved the OC% and available P of the soil. The overall mean production of rice grain following the substitution of 50% nitrogen with glyricidia in the rainy season and fertilizer application at the recommended dose in the post-rainy season was also equal to that given by the application of the recommended fertilizer dose applied in every season and increased the OC% and available P of the soil. This procedure reduced the fertilizer dose in the rainy season by 60 kg N, 30 kg P2O5 and 20 kg K2O/ha.

scholarly journals Aluminum as a risk factor for Alzheimer's disease

2008 ◽  
Vol 16 (1) ◽  
pp. 151-157 ◽  
Author(s):  
Pricilla Costa Ferreira ◽  
Kamila de Almeida Piai ◽  
Angela Maria Magosso Takayanagui ◽  
Susana Inés Segura-Muñoz
Keyword(s):  
Alzheimer’S Disease ◽  
Alzheimer's Disease ◽  
Risk Factor ◽  
Alzheimer Disease ◽  
Scientific Evidence ◽  
Long Term Effects ◽  
Aluminum Exposure ◽  
The World

The purpose of the study was to condense existing scientific evidence about the relation between aluminum (Al) exposure and risk for the development of Alzheimer's Disease (AD), evaluating its long-term effects on the population's health. A systematic literature review was carried out in two databases, MEDLINE and LILACS, between 1990 and 2005, using the uniterms: "Aluminum exposure and Alzheimer Disease" and "Aluminum and risk for Alzheimer Disease". After application of the Relevance Test, 34 studies were selected, among which 68% established a relation between Al and AD, 23.5% were inconclusive and 8.5% did not establish a relation between Al and AD. Results showed that Al is associated to several neurophysiologic processes that are responsible for the characteristic degeneration of AD. In spite of existing polemics all over the world about the role of Al as a risk factor for AD, in recent years, scientific evidence has demonstrated that Al is associated with the development of AD.

Ovarian Dysfunction in Fetally Irradiated Beagles

1977 ◽  
Vol 35 ◽  
pp. 658-659
Author(s):  
T. M. Seed ◽  
M. H. Sanderson ◽  
D. L. Gutzeit ◽  
T. E. Fritz ◽  
D. V. Tolle ◽  
...  
Keyword(s):  
Gamma Rays ◽  
Low Dose ◽  
Long Term Effects ◽  
Ovarian Dysfunction ◽  
Dose Rates ◽  
Highly Sensitive ◽  
Microscopic Evaluation ◽  
Ovarian Pathology ◽  
Normal Offspring

The developing mammalian fetus is thought to be highly sensitive to ionizing radiation. However, dose, dose-rate relationships are not well established, especially the long term effects of protracted, low-dose exposure. A previous report (1) has indicated that bred beagle bitches exposed to daily doses of 5 to 35 R 60Co gamma rays throughout gestation can produce viable, seemingly normal offspring. Puppies irradiated in utero are distinguishable from controls only by their smaller size, dental abnormalities, and, in adulthood, by their inability to bear young.We report here our preliminary microscopic evaluation of ovarian pathology in young pups continuously irradiated throughout gestation at daily (22 h/day) dose rates of either 0.4, 1.0, 2.5, or 5.0 R/day of gamma rays from an attenuated 60Co source. Pups from non-irradiated bitches served as controls. Experimental animals were evaluated clinically and hematologically (control + 5.0 R/day pups) at regular intervals.

Ultrastructural investigations of MDL 19,660-induced effects on the canine platelet and megakaryocyte

1990 ◽  
Vol 48 (3) ◽  
pp. 374-375
Author(s):  
D.E. Loudy ◽  
J. Sprinkle-Cavallo ◽  
J.T. Yarrington ◽  
F.Y. Thompson ◽  
J.P. Gibson
Keyword(s):  
Antidepressant Drug ◽  
Beagle Dogs ◽  
Long Term Effects ◽  
Short Term ◽  
Platelet Counts ◽  
Toxicological Studies ◽  
Induced Aggregation ◽  
Internal Architecture

Previous short term toxicological studies of one to two weeks duration have demonstrated that MDL 19,660 (5-(4-chlorophenyl)-2,4-dihydro-2,4-dimethyl-3Hl, 2,4-triazole-3-thione), an antidepressant drug, causes a dose-related thrombocytopenia in dogs. Platelet counts started to decline after two days of dosing with 30 mg/kg/day and continued to decrease to their lowest levels by 5-7 days. The loss in platelets was primarily of the small discoid subpopulation. In vitro studies have also indicated that MDL 19,660: does not spontaneously aggregate canine platelets and has moderate antiaggregating properties by inhibiting ADP-induced aggregation. The objectives of the present investigation of MDL 19,660 were to evaluate ultrastructurally long term effects on platelet internal architecture and changes in subpopulations of platelets and megakaryocytes.Nine male and nine female beagle dogs were divided equally into three groups and were administered orally 0, 15, or 30 mg/kg/day of MDL 19,660 for three months. Compared to a control platelet range of 353,000- 452,000/μl, a doserelated thrombocytopenia reached a maximum severity of an average of 135,000/μl for the 15 mg/kg/day dogs after two weeks and 81,000/μl for the 30 mg/kg/day dogs after one week.

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