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PubMed2003

Allelopathy in the natural and agricultural ecosystems and isolation of potent allelochemicals from Velvet bean (Mucuna pruriens) and Hairy vetch (Vicia villosa).

We have studied on allelopathy of plants and developed methods to identify the effective substances in root exudates, leaf leacheate, and volatile chemicals emitted from plants. We found traditional cover plants that show allelopathic activity are useful for weed control. It could eliminate the use of synthetic chemicals for this purpose. Allelopathy is a natural power of plants to protect themselves by producing natural organic chemicals. Some endemic plants in Asia, already known by farmers in the region, as either cover crops used in intercropping, hedgerow, or agroforestry, were found to possess strong allelopathic abilities. Our group identified several allelochemicals from these plants. These allelopathic cover crops, mostly leguminous plants, provide protein rich food, and grow easily without artificial fertilizers, herbicides, insecticides and fungicides. In this regards, these allelopathic cover crops could save food shortage in rural area, and are useful for environmental conservation. Screenings of allelopathic plants by specific bioassays and field tests have been conducted. Hairy vetch (Vicia villosa) and Velvet bean (Mucuna pruriens) are two promising species for the practical application of allelopathy. An amino acid, L-DOPA, unusual in plants, plays an important role as allelochemical in Velvet bean (Mucuna pruriens). Hairy vetch is the most promising cover plant for the weed control in orchard, vegetable and rice production and even for landscape amendment in abandoned field in Japan. We have isolated "cyanamide", a well known nitrogen fertilizer, from Hairy vetch. This is the first finding of naturally produced cyanamide in the world.

Crops, Agricultural↗
PubMedDate not supplied

[Amendments to Directive 90/394/CEE and effects on chapter VII of Law 626/94].

The European Union (EU) has recently twice amended the framework Council Directive 90/394/CEE on the protection of workers from risks related to exposure to carcinogens at work: protective measures were extended to category 1 and 2 mutagens; a new carcinogenic agent was identified in "work involving exposure to hardwood dusts" and three exposure limit values were fixed for carcinogens. The EU Member States are required to incorporate amending Directives into national legislation not later than 29 April 2003. Italy acknowledged these directives by the Decree 66/00 of the 25/2/2000. In this paper the development and the evolution of European legislation in the twenty years from 1980 to 2000 are overviewed: first, occupational exposure limits were defined and introduced for harmful chemicals, then for occupational carcinogens and later three binding limit values for benzene, VCM and hardwood dusts were fixed. The paper attempts to identify the expected problems and advantages that incorporation of the amending Directives will have on the protection of workers from carcinogenic risk.

European Union↗
PubMed1999

Accelerated coffee pulp composting.

The effect of two abundant, easily available and very low-cost agro-industrial organic residues, i.e., filter cake from the sugar industry and poultry litter, on the composting stabilization time of coffee pulp and on the quality of the produced compost, was evaluated. Piles of one cubic meter were built and monitored within the facilities of a coffee processing plant in the Coatepec region of the State of Veracruz, Mexico. Manual aeration was carried out once a week. A longer thermophilic period (28 days) and a much lower C/N ratio (in the range of 6.9-9.1) were observed in the piles containing the amendments, as compared to the control pile containing only coffee pulp (14 days and a C/N ratio of 14.4, respectively). The maximum assimilation rate of the reducing sugars was 1.6 g kg-1 d-1 (from 7.5 to 5.3%) during the first two weeks when accelerators were present in the proportion of 20% filter cake plus 20% poultry litter, while they accumulated at a rate of 1.2 g kg-1 d-1 (from 7.4 to 9.13%) during the same period in the control pile. The best combination of amendments was 30% filter cake with 20% poultry litter, resulting in a final nitrogen content as high as 4.81%. The second best combination was 20% filter cake with 10% poultry litter, resulting in a compost which also contained a high level of total nitrogen (4.54%). It was concluded that the use of these two residues enhanced the composting process of coffee pulp, promoting a shorter stabilization period and yielding a higher quality of compost.

Biodegradation, Environmental↗
PubMed2006

Can transgenic maize affect soil microbial communities?

The aim of the experiment was to determine if temporal variations of belowground activity reflect the influence of the Cry1Ab protein from transgenic maize on soil bacteria and, hence, on a regulatory change of the microbial community (ability to metabolize sources belonging to different chemical guilds) and/or a change in numerical abundance of their cells. Litter placement is known for its strong influence on the soil decomposer communities. The effects of the addition of crop residues on respiration and catabolic activities of the bacterial community were examined in microcosm experiments. Four cultivars of Zea mays L. of two different isolines (each one including the conventional crop and its Bacillus thuringiensis cultivar) and one control of bulk soil were included in the experimental design. The growth models suggest a dichotomy between soils amended with either conventional or transgenic maize residues. The Cry1Ab protein appeared to influence the composition of the microbial community. The highly enhanced soil respiration observed during the first 72 h after the addition of Bt-maize residues can be interpreted as being related to the presence of the transgenic crop residues. This result was confirmed by agar plate counting, as the averages of the colony-forming units of soils in conventional treatments were about one-third of those treated with transgenic straw. Furthermore, the addition of Bt-maize appeared to induce increased microbial consumption of carbohydrates in BIOLOG EcoPlates. Three weeks after the addition of maize residues to the soils, no differences between the consumption rate of specific chemical guilds by bacteria in soils amended with transgenic maize and bacteria in soils amended with conventional maize were detectable. Reaped crop residues, comparable to post-harvest maize straw (a common practice in current agriculture), rapidly influence the soil bacterial cells at a functional level. Overall, these data support the existence of short Bt-induced ecological shifts in the microbial communities of croplands' soils.

Carbon↗
PubMed2006

Effect of chemical and microbial amendment on phosphorus runoff from composted poultry litter.

Environmental impacts of composting poultry litter with chemical amendments at the field scale have not been well quantified. The objectives of this study were to measure (i) P runoff and (ii) forage yield and N uptake from small plots fertilized with composted and fresh poultry litter. Two composting studies, aerated using mechanical turning, were conducted in consecutive years. Composted litter was collected at the completion of each study for use in runoff studies. Treatments in runoff studies included an unfertilized control, fresh (uncomposted) poultry litter, and litter composted with no amendment, H3PO4, alum, or a microbial mixture. An additional treatment, litter composted with alum plus the microbial mixture, was evaluated during the first year. Fertilizer treatments were applied at rates equivalent to 8.96 Mg ha(-1) and rainfall simulators were used to produce a 5 cm h(-1) storm event. Composted poultry litter, regardless of treatment, had higher total P concentrations than fresh poultry litter. Composting poultry litter resulted in reductions of N/P ratios by as much as 51%. Soluble reactive P concentrations were lowest in alum-treated compost, which reduced soluble P concentrations in runoff water by as much as 84%. Forage yields and N uptake were greatest from plots fertilized with fresh poultry litter. Composting poultry litter without the addition of C sources can increase P concentrations in the end product and surface runoff. This study also indicated that increased rates of composted poultry litter would be required to meet equivalent N rates supplied by fresh poultry litter.

Alum Compounds↗
PubMed2005

Use of dolomite phosphate rock (DPR) fertilizers to reduce phosphorus leaching from sandy soil.

There is increasing concern over P leaching from sandy soils applied with water-soluble P fertilizers. Laboratory column leaching experiments were conducted to evaluate P leaching from a typical acidic sandy soil in Florida amended with DPR fertilizers developed from dolomite phosphate rock (DPR) and N-Viro soil. Ten leaching events were carried out at an interval of 7 days, with a total leaching volume of 1,183 mm equivalent to the mean annual rainfall of this region during the period of 2001-2003. Leachates were collected and analyzed for total P and inorganic P. Phosphorus in the leachate was dominantly reactive, accounting for 67.7-99.9% of total P leached. Phosphorus leaching loss mainly occurred in the first three leaching events, accounting for 62.0-98.8% of the total P leached over the whole period. The percentage of P leached (in the total P added) from the soil amended with water-soluble P fertilizer was higher than those receiving the DPR fertilizers. The former was up to 96.6%, whereas the latter ranged from 0.3% to 3.8%. These results indicate that the use of N-Viro-based DPR fertilizers can reduce P leaching from sandy soils.

Calcium Carbonate↗
PubMed2025

Prenatal screening for trisomy 21 (Down syndrome) using first- and second-trimester biochemistry and nuchal translucency: A technical standard of the American College of Medical Genetics and Genomics (ACMG).

This technical standard was developed as a guide for laboratories performing prenatal screening for Down syndrome. It addresses 3 topics: second trimester (triple or quad), first trimester, including incorporation of nuchal translucency, and current directions in cell-free DNA screening. Analytic methods, clinical considerations, screening performance, guidelines for reporting second trimester, first trimester, integrated, contingent, and reflex screening tests for Down syndrome, are discussed. Individual laboratories are responsible for meeting the quality assurance standards described by the Clinical Laboratory Improvement Amendments, the College of American Pathologists, and other regulatory agencies, with respect to appropriate sample documentation, assay validation, general proficiency, and quality control measures.

Humans↗
PubMed2005

Inhibition of bacterial perchlorate reduction by zero-valent iron.

Perchlorate was reduced by a mixed bacterial culture over a pH range of 7.0-8.9. Similar rates of perchlorate reduction were observed between pH 7.0 and 8.5, whereas significantly slower reduction occurred at pH 8.9. Addition of iron metal, Fe(0), to the mixed bacterial culture resulted in slower rates of perchlorate reduction. Negligible perchlorate reduction was observed under abiotic conditions with Fe(0) alone in a reduced anaerobic medium. The inhibition of perchlorate reduction observed in the presence of Fe(0) is in contrast to previous studies that have shown faster rates of contaminant reduction when bacteria and Fe(0) were combined compared to bacteria alone. The addition of Fe(0) resulted in a rise in pH, as well as precipitation of Fe minerals that appeared to encapsulate the bacterial cells. In experiments where pH was kept constant, the addition of Fe(0) still resulted in slower rates of perchlorate reduction suggesting that encapsulation of bacteria by Fe precipitates contributed to the inhibition of the bacterial activity independent of the effect of pH on bacteria. These results provide the first evidence linking accumulation of iron precipitates at the cell surface to inhibition of environmental contaminant degradation. Fe(0) was not a suitable amendment to stimulate perchlorate-degrading bacteria and the bacterial inhibition caused by precipitation of reduced Fe species may be important in other combined anaerobic bacterial-Fe(0) systems. Furthermore, the inhibition of bacterial activity by iron precipitation may have significant implications for the design of in situ bioremediation technologies for treatment of perchlorate plumes.

Bacteria↗
PubMed1999

National Health Accounts development: lessons from Thailand.

National Health Accounts (NHA) are an important tool to demonstrate how a country's health resources are spent, on what services, and who pays for them. NHA are used by policy-makers for monitoring health expenditure patterns; policy instruments to re-orientate the pattern can then be further introduced. The National Economic and Social Development Board (NESDB) of Thailand produces aggregate health expenditure data but its estimation methods have several limitations. This has led to the research and development of an NHA prototype in 1994, through an agreed definition of health expenditure and methodology, in consultation with peer and other stakeholders. This is an initiative by local researchers without external support, with an emphasis on putting the system into place. It involves two steps: firstly, the flow of funds from ultimate sources of finance to financing agencies; and secondly, the use of funds by financing agencies. Five ultimate sources and 12 financing agencies (seven public and five private) were identified. Use of consumption expenditures was listed under four main categories and 32 sub-categories. Using 1994 figures, we estimated a total health expenditure of 128,305.11 million Baht; 84.07% consumption and 15.93% capital formation. Of total consumption expenditure, 36.14% was spent on purchasing care from public providers, with 32.35% on private providers, 5.93% on administration and 9.65% on all other public health programmes. Public sources of finance were responsible for 48.79% and private 51.21% of the total 1994 health expenditure. Total health expenditure accounted for 3.56% of GDP (consumption expenditure at 3.00% of GDP and capital formation at 0.57% of GDP). The NESDB consumption expenditure estimate in 1994 was 180,516 million Baht or 5.01% of GDP, of which private sources were dominant (82.17%) and public sources played a minor role (17.83%). The discrepancy of consumption expenditure between the two estimates is 2.01% of GDP. There is also a large difference in the public and private proportion of consumption expenses, at 46:54 in NHA and 18:82 in NESDB. Future NHA sustainable development is proposed. Firstly, we need more accurate aggregate and disaggregated data, especially from households, who take the lion's share of total expenditure, based on amended questionnaires in the National Statistical Office Household Socio-Economic Survey. Secondly, partnership building with NESDB and other financing agencies is needed in the further development of the financial information system to suit the biennial NHA report. Thirdly, expenditures need breaking down into ambulatory and inpatient care for monitoring and the proper introduction of policy instruments. We also suggest that in a pluralistic health care system, the breakdown of spending on public and private providers is important. Finally, a sustainable NHA development and utilization of NHA for planning and policy development is the prime objective. International comparisons through collaborative efforts in standardizing definition and methodology will be a useful by-product when developing countries are able to sustain their NHA reports.

Data Collection↗
PubMed2003

[Cardiovascular risk factors assessment in Rambam Center Preventive Medicine].

Atherosclerosis, expressing itself as cardiovascular disease, is the first cause of death in Israel, in people over 35 years of age. The main risk factors for atherosclerosis are generally known, and amendable, resulting in a decrease in morbidity and mortality rates. In our present article we investigate the prevalence of major atherosclerosis risk factors in the population being examined in the Rambam Center of Preventive Medicine. This is a young population, usually considered healthy. The prevalence of the major risk factors is high, and a large portion of the population is at high risk of developing cardiovascular disease. Identifying the people at high risk of developing cardiovascular disease and of instigating preventive measures is of utmost importance.

Adult↗
PubMed2003

Effect of lime stabilisation of enhanced biological phosphorus removal sludges on the phosphorus availability to plants.

This study investigates the phosphorus (P) availability in lime stabilised biological phosphorus removal sludges. Lime-stabilised sludge amendments (LS), non-stabilised sludge amendments (S) and amendments with a chemical fertiliser (TSP) were compared through plant uptake of P and Olsen-extractable P for this purpose. In the first part of the study, pot experiments were performed, where a dewatered biological phosphorus removal sludge was applied to pots at increasing rates of P. A P-deficient, alkaline soil was used in the experiments and Lollium perenne was the testing plant. In the second part (incubation tests), the waste activated sludge from an Enhanced Biological Phosphorus Removal (EBPR) process was mixed with the same soil at a pre-determined P-based rate. The pot experiments showed that, the efficiency of the fertilising materials, based on the minimum P applied to reach the maximum yield, was in the following order: S approximately equal to LS > TSP. However, the P concentration in the plant tissue was in the order of TSP > S >LS for all P application rates. In the incubation tests, the EBPR sludge raised the soil P-level from the low range to the medium range. The P-availability in TSP decreased rapidly with time whereas that in S and LS remained almost constant.

Biological Availability↗
PubMed1998

[The new norms decreed by the legislative dirrective 91-93 CCE].

The Community law now rules any sector of the economy including the Pharmaceutical Industry, which is controlled with a special attention starting from drugs manufacturing up to marketing. After detailing the Community regulations acknowledged by the Italian legislation since the adoption of the first Pharmaceutical Directive in 1965, the Authors examine the Decree Law of february 1997 by which the EEC Directive 93/39 is acknowledged (as amended Directives EEC 65/65,75/318 and 75/319 relating to medicinal products for human use). A special attention is devoted to the several regulations concerning Pharmacovigilance, whose importance is emphasized.

Drug Industry↗
PubMed1999

Nitrogen availability to Pseudomonas fluorescens DF57 is limited during decomposition of barley straw in bulk soil and in the barley rhizosphere.

The availability of nitrogen to Pseudomonas fluorescens DF57 during straw degradation in bulk soil and in barley rhizosphere was studied by introducing a bioluminescent reporter strain (DF57-N3), responding to nitrogen limitation, to model systems of varying complexity. DF57-N3 was apparently not nitrogen limited in the natural and sterilized bulk soil used for these experiments. The soil was subsequently amended with barley straw, representing a plant residue with a high carbon-to-nitrogen ratio (between 60 and 100). In these systems the DF57-N3 population gradually developed a nitrogen limitation response during the first week of straw decomposition, but exclusively in the presence of the indigenous microbial population. This probably reflects the restricted ability of DF57 to degrade plant polymers by hydrolytic enzymes. The impact of the indigenous population on nitrogen availability to DF57-N3 was mimicked by the cellulolytic organism Trichoderma harzianum Rifai strain T3 when coinoculated with DF57-N3 in sterilized, straw-amended soil. Limitation occurred concomitantly with fungal cellulase production, pointing to the significance of hydrolytic activity for the mobilization of straw carbon sources, thereby increasing the nitrogen demand. Enhanced survival of DF57-N3 in natural soil after straw amendment further indicated that DF57 was cross-fed with carbon/energy sources. The natural barley rhizosphere was experienced by DF57-N3 as an environment with restricted nitrogen availability regardless of straw amendment. In the rhizosphere of plants grown in sterilized soil, nitrogen limitation was less severe, pointing to competition with indigenous microorganisms as an important determinant of the nitrogen status for DF57-N3 in this environment. Hence, these studies have demonstrated that nitrogen availability and gene expression in Pseudomonas is intimately linked to the structure and function of the microbial community. Further, it was demonstrated that the activities of cellulolytic microorganisms may affect the availability of energy and specific nutrients to a group of organisms deficient in hydrolytic enzyme activities.

Biodegradation, Environmental↗
PubMed2005

Bioaccumulation of heavy metals in Dactylis glomerata L. growing in a calcareous soil amended with sewage sludge.

The total and DTPA-extractable concentrations of Pb, Ni, Zn, Cu, Cr and Cd were measured in a calcareous soil amended with different doses of sewage sludge under field conditions. The same metals were also measured in the roots and leaves of Dactylis glomerata at the end of the first vegetative period after the sludge was added. The root concentrations of all the metals were unrelated to their concentrations in the soil. Leaf concentrations of Zn and Cr correlated with total (Zn) and DTPA-extractable (Zn and Cr) concentrations in the soil. DTPA extraction did not appear to be very useful for evaluating the bioavailability of metals in this kind of soil as it gave very low correlation coefficients with leaf content (r = 0.684, P = 0.0049 for Zn and r = 0.557, P = 0.0249 for Cr). Concentrations of Pb, Ni, Cu, and Cd in roots and leaves of Dactylis glomerata were unrelated to the total or DTPA-extractable concentrations in the sludge-amended soil.

Biological Availability↗
PubMed2005

Management of mine spoil for crop productivity with lignite fly ash and biological amendments.

Long-term field trials using lignite fly ash (LFA) were carried out in rice crops during the period 1996-2000 at Mine I, Neyveli Lignite Corporation, Tamil Nadu. LFA, being alkaline and endowed with an excellent pozzolanic nature, silt loam texture, and plant nutrients, has the potential to improve the texture, fertility, and crop productivity of mine spoil. The rice crops were the first, third, fifth, and sixth crops in rotation. The other crops, such as green gram (second) and sun hemp (fourth), were grown as green manure. For experimental trials, LFA was applied at various dosages (0, 5, 10, 20, 50, 100, and 200 t/ha), with and without press mud (10 t/ha), before cultivation of the first crop. Repeat applications of LFA were made at the same dosages in treatments of up to 50 t/ha (with and without press mud) before cultivation of the third and fifth crops. Press mud, a lightweight organic waste product from the sugar industry, was used as an organic amendment and source of plant nutrients. Also, a recommended dosage of chemical fertilizer, along with gypsum, humic acid, and biofertilizer as supplementing agents, was applied in all the treatments, including control. With one-time and repeat applications of LFA, from 5 to 20 t/ha (with and without press mud), the crop yield (grain and straw) increased significantly (p < 0.05), in the range from 3.0 to 42.0% over the corresponding control. The maximum yield was obtained with repeat applications of 20 t/ha of LFA with press mud in the third crop. The press mud enhanced the yield in the range of 1.5-10.2% with various dosages of LFA. The optimum dosage of LFA was 20 t/ha for both one-time and repeat applications. Repeat applications of LFA at lower dosages of up to 20 t/ha were more effective in increasing the yield than the corresponding one-time applications of up to 20 t/ha and repeat applications at 50 t/ha. One-time and repeat applications of LFA of up to 20 t/ha (with and without press mud), apart from increasing the yield, evinced improvement in the texture and fertility of mine spoil and the nutrient content of crop produce. Furthermore, some increase in the content of trace and heavy metals and the level of gamma-emitters in the mine spoil and crop produce was observed, but well within the permissible limits. The residual effect of LFA on succeeding crops was also encouraging in terms of eco-friendliness. Beyond 20 t/ha of LFA, the crop yield decreased significantly (p < 0.05), as a result of the formation of hardpan in the mine spoil and possibly the higher concentration of soluble salts in the LFA. However, the adverse effects of soluble salts were annulled progressively during the cultivation of succeeding crops. A plausible mechanism for the improved fertility of mine spoil and the carryover or uptake of toxic trace and heavy metals and gamma-emitters in mine spoil and crop produce is also discussed.

Agriculture↗
PubMed2003

Toxic potential of oleander derived compost and vegetables grown with oleander soil amendments.

California recycles 50% of previously disposed trash. Increased use of yardwastes and composts has raised concern about toxic materials in these products. Oleander is a toxic shrub common to CA landscapes and is frequently clipped and disposed of in greenwaste containers, resulting in concerns about the toxicity of oleander-contaminated yardwastes and composts from these wastes. Information about breakdown of oleandrin (one of the glycoside toxicants of oleander) during composting or the ability of plants to absorb this molecule has not been reported. In separate experiments, we documented the apparent first-order disappearance of oleandrin from composts of pure oleander, with a disappearance half-life of 15 d. Within 50 d, 90% of the oleandrin was removed during aerobic composting in a turned pile. In an amendment study with fresh uncomposted oleander, no oleandrin was detected in tomato and zuchinni fruit, snap beans, carrot tubers, or green lettuce. Oleandrin was found in red leaf lettuce growing in soils mulched with oleander, but oleandrin concentrations were near the detection limit of the assay. Soil from oleander mulched and amended plots contained low levels of oleandrin at the time of harvest.

California↗