9 research outputs found
The influence of some chemical indices of soils on earthworm abundance (Oligochaeta: Lumbricidae) in conditions of organic and mineral fertilization
This paper presents data obtained by researching the influence of organic fertilizers (bovine manure in dose of 20
t/ha) and chemical fertilizers (N120P120) on earthworm dynamics in soil, under aspect of individuals number and
biomass, within the wheat and maize cultures, on a luvic phaeozem soil (FAO System). It was observed that in wheat
culture was identified an earthworm number and a biomass larger than in the maize culture, regardless the fertilization
type. The chemical fertilization negatively influenced both the earthworm number and their biomass, in both plant
cultures. The organic fertilization positively influenced the earthworm activity, their number and biomass significantly
increasing. In this case there was noticed a superior activity of earthworms in the wheat culture against the maize. The
statistical study made by regression and correlation methods for the data recorded in the control variant showed that the
chemical parameters of soil nitrogen index, potassium and pH manifest by the recorded values in the experimental
variants a positive influence on earthworms’ number and biomass. For the variant with chemical fertilization (N120P120),
the same factors have positive influences on the earthworms’ number, the same tendency being observed regarding the
biomass too. In the case of organic fertilization it was observed both for the earthworm number and biomass a positive
influence of the analyzed factors pH, nitrogen index and potassium. The factor phosphorous manifested a negative
influence on earthworms’ dynamics
Ecotoxicological assessment of the effect of some new organic-mineral fertilizers on Eisenia foetida earthworms
Ecotoxicity tests provide a direct measure of the bioavailability of toxicants and help to establish linkages between site
contamination and adverse ecological effects. There are more current laboratory test methods outlined, but it is very
important the major advantages/disadvantages of each of them. The present paper uses as research methodology the
OECD Guideline for testing of chemicals no. 207 which meets the most criteria expected for ecotoxicological testing.
Earthworms Eisenia foetida (Savigny, 1826) had been exposed for 14 days to a geometrical series range of
concentrations of the test substances (organic-mineral fertilizers L-200-Hum and SH-120). The performed study
showed that the fertilizer L-200-Hum determined lower earthworm mortality comparing to SH-120 for all tested
concentration levels and the fertilizer L-200-Hum positively influenced the earthworm rate of biomass accumulation.
DL 50 it was established to be the concentration 4 g for the SH-120 fertilizer at the end of the test (14 days)
Organic agriculture of Romania as compared with other countries of European Union
The paper presents a case study aiming to highlight the present state of the organic agriculture in Romania as compared
with other European countries with the goal to warn about its level, much under other countries taken in study. Several
indicators have been considered: certified organic crop areas, certified organic crop productions and yields from fully
converted areas, certified organic livestock, certified production of organic animal products, number of certified
registered operators processing and importing products issued from organic farming. The results of study showed that
for all studied indicators Romania reported data with lower values as compared with the other analyzed European states,
and for most of items our country has no data to report. This study distinguishes on the one hand the low representation
of organic agriculture in Romania as component of sustainable agriculture, and on the other hand demonstrates the lack
or the inefficacy of instruments of the specialized institution of the Romanian state to collect and centralize data
referring to several items which characterize the level of organic agriculture in Romania
MUSCULOSKELETAL ISSUES AMONG DENTAL MEDICINE STUDENTS: A CROSS-SECTIONAL STUDY
The burden of work-related musculoskeletal pathology among dental professionals is widely recognized,
particularly associated with specific risk factors in routine practice. Aim of the study: The main objective of our
study was to evaluate musculoskeletal issues in students in dentistry based on their participation in different
levels of professional activities, and to identify potential risk factors. Material and methods: We performed a
cross-sectional study in 100 consecutive students attending the School of Dentistry, “Grigore T. Popa”
University of Medicine and Pharmacy Iasi, classified in two main groups: 50 students in their first and second
year of study, not engaged in specific dental work (group A) and 50 students in their third to sixth year, already
performing professional activities in patient (group B). A predefined questionnaire survey was applied in all
students, including general data, risk factors for musculoskeletal problems, and information on pain (vertebral,
hand) and muscle spasm as main musculoskeletal complains potentially related to their professional doings.
Conclusions: Ergonomic postures adopted by the student / dentist in routine practice as well as ergonomic
dental instruments are usually associated with less vertebral (lumbar spine) and hand pathology. Ergonomic
principles must be applied in routine dental practice and the student educated about prevention of
musculoskeletal pathology
Research of physical-mechanical properties of soil related to earthworms abundance in agricultural and background agroecosystems at Didactic and Experimental Station "Chetrosu", Republic of Moldova
Within agroecological monitoring, an essential role is played by the biological monitoring, because surveillance of
living organisms provides precious information regarding the vitality of agroecosystems and quality of environmental
factors, essential for the quality of agricultural products and natural resources. The goal of earthworms’ complex
research is establishment of the high efficient agrocoenoses, ecologically balanced, stable, based on the rational usage
of the nutritive substances of soil, vegetable rests, water, and finally the application of environment-friendly
technologies. From this point of view, earthworms can be used within the agroecological monitoring, because they can
be easily extracted from their environment without affecting the population assembly. Essential for earthworms’ habitat
is soil texture and soil humidity, physical-mechanical properties, organic debris, both quantitatively and qualitatively.
The soil of the researched ecosystems was represented by calcic (carbonated) silt loamy chernozem. The limits of
plasticity, resistance to penetration, and adherence of soil are influenced by humus content, fertilization type, and
diversity of agrocoenoses. The forest strip and fallow farmland can contribute by providing with information the
Database of background and agroecological (impact) monitoring. During the droughty seasons, earthworms were not
found in soil, but a maximal number has been identified in forest strip (76 worms/m2
) at 0-30 cm depth, which
represents a hiding habitat during the arid periods
THE PLURIFACTORIAL APPROACH TO DENTO-SOMATO-FACIAL DISHARMONY AT THE CONFLUENCE OF NEW BIOMATERIALS, TECHNIQUES AND TECHNOLOGIES
The impact of aesthetic disharmonies on the balance of the stomatognathic system is an eloquent plea for the implementation of well-conducted prophylactic methods, with the elimination of etiopathogenic factors correlate with iatrogenicity, the type of biomaterial used, the technological approach, without avoiding the archetypes characterized by the specifics of the general binominal state-oral pathology . Considering the complexity and variety of the pathology generated by the dento – somato -facial disharmony, the study aimed to individualize an aesthetic evaluation algorithm, quantifying the installed complications and the present restorative treatments in triggering the area of signs and symptoms of this clinical entity with profound implications on the oral balance. After analyzing the parameters related to the units odontal and the relationships that are established between them at the level of the dental arches, between these lips and the main lines of the face, we will proceed to the analysis of the gingival festoon. The cases in which restoration of the dento-periodontal aesthetic balance can be achieved exclusively through a single treatment method are relatively few in numb