60 research outputs found
On Problem of Professional Training of Social Workers within the Framework of Higher Education
The issue of training of social workers in higher education is considered. The relevance of the research is caused by changes of socio-economic and technological nature, taking place in modern society, implying the training of specialists of higher level: “multi-functional,” meeting international standards of training professionals to implement certain urgent tasks. Professionalization refers to the process of improving a person’s knowledge, skills and abilities in the context of an activity that involves the presence of a certain subject represented in the culture of a given society, and ways of working with it. The authors rely on the indicators of the level of professional training offered by Yu. P. Povarenkov: professional effectiveness, professional identity and professional maturity. The novelty of the research lies in destinguishing three levels of “co-existence essence” of professional training of social professionals: adaptive-orientational, subject-effective and innovative-creative. The authors dwell on the position, according to which the student evolves as a subject of activity only in certain educational conditions: motivating environment of the educational institution as a factor contributing to the active development of new knowledge, skills and abilities; well-organized training and education aimed at increasing the effectiveness of students and teachers; tracking the dynamics of creative development of students, their improvement in personal and professional relationships
Significance of Soil Lightness Versus Physicochemical Soil Properties in Semiarid Areas
This is an author's accepted manuscript of an article published in " Arid Land Research and Management"; Volume 28, Issue 4, 2014; copyright Taylor & Francis; available online at:
http://www.tandfonline.com/doi/abs/10.1080/15324982.2014.882871Modern agriculture aims to encompass all soil attributes to optimize soil use and
minimize environmental impacts. One of those attributes is soil color, which allows
determining important soil variables for crop management and soil conservation. In
this study, the relationships between lightness and several pedologic, topographic,
and soil management variables were determined. One hundred and ten topsoil
points were sampled in an area where the Mediterranean climate is the only
homogeneous soil forming factor. Soil samples were air dried, crushed, and sieved,
and lightness measurements were made using a trichromatic colorimeter. The
relationships between lightness and soil-related parameters were carried out by
means of bivariate linear correlation, and Mann-Witney and Kruskal-Wallis tests.
Soil textural fractions (sand and silt), electrical conductivity and carbonates were
statistically significant (p<0.001) and exhibited moderate correlation coefficients
(0.32 0.45). Topographic variables (slope and aspect), soil organic carbon, iron,
nitrogen, pH, and parent material (marls) exhibited lower effect on lightness.
The response of lightness to clay content was highly conditioned by iron content.
Stoniness, phosphorous, elevation, and soil management variables (irrigation and
land use) were not statistically significant. The results obtained with calcareous
samples from semiarid areas showed that soil lightness behavior agree with findings
in developed soils, despite of the large differences in soil composition and the
heterogeneity of the study area.Moreno-Ramón, H.; Marqués-Mateu, Á.; Ibañez Asensio, S. (2014). Significance of Soil Lightness Versus Physicochemical Soil Properties in Semiarid Areas. Arid Land Research and Management. 28(4):371-382. doi:10.1080/15324982.2014.882871S371382284Al-Mahawili , S. M. H. , M. F. Baumgardner , R. A. Weismiller , and W. N. Melhorn . 1983 . Satellite image interpretation and laboratory spectral reflectance measurements of saline and gypsiferous soils of West Baghdad, Iraq.LARS Technical Reports. Paper 104.Barrett, L. R. (2002). Spectrophotometric color measurement in situ in well drained sandy soils. Geoderma, 108(1-2), 49-77. doi:10.1016/s0016-7061(02)00121-0Bogrekci, I., & Lee, W. S. (2005). Spectral Phosphorus Mapping using Diffuse Reflectance of Soils and Grass. Biosystems Engineering, 91(3), 305-312. doi:10.1016/j.biosystemseng.2005.04.015Buol, S. W., Southard, R. J., Graham, R. C., & McDaniel, P. A. (2011). Soil Genesis and Classification. doi:10.1002/9780470960622Christensen, L. K., Bennedsen, B. S., Jørgensen, R. N., & Nielsen, H. (2004). Modelling Nitrogen and Phosphorus Content at Early Growth Stages in Spring Barley using Hyperspectral Line Scanning. Biosystems Engineering, 88(1), 19-24. doi:10.1016/j.biosystemseng.2004.02.006Doi, R., Wachrinrat, C., Teejuntuk, S., Sakurai, K., & Sahunalu, P. (2009). Semiquantitative color profiling of soils over a land degradation gradient in Sakaerat, Thailand. Environmental Monitoring and Assessment, 170(1-4), 301-309. doi:10.1007/s10661-009-1233-xDuiker, S. W., Rhoton, F. E., Torrent, J., Smeck, N. E., & Lal, R. (2003). Iron (Hydr)Oxide Crystallinity Effects on Soil Aggregation. Soil Science Society of America Journal, 67(2), 606. doi:10.2136/sssaj2003.0606Ehsani, M. R., Upadhyaya, S. K., Slaughter, D., Shafii, S., & Pelletier, M. (1999). Precision Agriculture, 1(2), 219-236. doi:10.1023/a:1009916108990Gunal, H., Ersahin, S., Yetgin, B., & Kutlu, T. (2008). Use of Chromameter‐Measured Color Parameters in Estimating Color‐Related Soil Variables. Communications in Soil Science and Plant Analysis, 39(5-6), 726-740. doi:10.1080/00103620701879422Ibarra-F., F. A., Martin-R., M. H., Cox, J. R., Crowl, T. A., Post, D. F., Miller, R. W., & Rasmussen, G. A. (1995). Relationship between Buffelgrass Survival, Organic Carbon, and Soil Color in Mexico. Soil Science Society of America Journal, 59(4), 1120. doi:10.2136/sssaj1995.03615995005900040025xKonen, M. E., Burras, C. L., & Sandor, J. A. (2003). Organic Carbon, Texture, and Quantitative Color Measurement Relationships for Cultivated Soils in North Central Iowa. Soil Science Society of America Journal, 67(6), 1823. doi:10.2136/sssaj2003.1823Mouazen, A. M., Maleki, M. R., De Baerdemaeker, J., & Ramon, H. (2007). On-line measurement of some selected soil properties using a VIS–NIR sensor. Soil and Tillage Research, 93(1), 13-27. doi:10.1016/j.still.2006.03.009Pan, G., Xu, X., Smith, P., Pan, W., & Lal, R. (2010). An increase in topsoil SOC stock of China’s croplands between 1985 and 2006 revealed by soil monitoring. Agriculture, Ecosystems & Environment, 136(1-2), 133-138. doi:10.1016/j.agee.2009.12.011Sánchez-Marañón, M., Martín-García, J. M., & Delgado, R. (2011). Effects of the fabric on the relationship between aggregate stability and color in a Regosol–Umbrisol soilscape. Geoderma, 162(1-2), 86-95. doi:10.1016/j.geoderma.2011.01.008Sánchez-Marañón, M., Ortega, R., Miralles, I., & Soriano, M. (2007). Estimating the mass wetness of Spanish arid soils from lightness measurements. Geoderma, 141(3-4), 397-406. doi:10.1016/j.geoderma.2007.07.005Sánchez-Marañón, M., Delgado, G., Melgosa, M., Hita, E., & Delgado, R. (1997). CIELAB COLOR PARAMETERS AND THEIR RELATIONSHIP TO SOIL CHARACTERISTICS IN MEDITERRANEAN RED SOILS. Soil Science, 162(11), 833-842. doi:10.1097/00010694-199711000-00007Singleton, P. (1991). Water tables and soil colour as an indicator of saturation in some soils of the Waikato, New Zealand. Soil Research, 29(4), 467. doi:10.1071/sr9910467Spielvogel, S., Knicker, H., & Kögel-Knabner, I. (2004). Soil organic matter composition and soil lightness. Journal of Plant Nutrition and Soil Science, 167(5), 545-555. doi:10.1002/jpln.200421424Viscarra Rossel, R. A., Minasny, B., Roudier, P., & McBratney, A. B. (2006). Colour space models for soil science. Geoderma, 133(3-4), 320-337. doi:10.1016/j.geoderma.2005.07.017Webster, R., & Oliver, M. A. (2007). Geostatistics for Environmental Scientists. Statistics in Practice. doi:10.1002/978047051727
Composition of soil solutions from the main soil types of the central state natural biosphere reserve
Basic fibroblast growth factor can mediate the early inductive events in renal development.
Water retention curves and chemical compositions of soil solutions from some soils of the Central Forest State Nature Biosphere Reserve
Sonic hedgehog signaling is essential for hair development
Background: The skin is responsible for forming a variety of epidermal structures that differ amongst vertebrates. In each case the specific structure (for example scale, feather or hair) arises from an epidermal placode as a result of epithelial–mesenchymal interactions with the underlying dermal mesenchyme. Expression of members of the Wnt, Hedgehog and bone morphogenetic protein families (Wnt10b, Sonic hedgehog (Shh) and Bmp2/Bmp4, respectively) in the epidermis correlates with the initiation of hair follicle formation. Further, their expression continues into either the epidermally derived hair matrix which forms the hair itself, or the dermal papilla which is responsible for induction of the hair matrix. To address the role of Shh in the hair follicle, we have examined Shh null mutant mice.
Results: We found that follicle development in the Shh mutant embryo arrested after the initial epidermal–dermal interactions that lead to the formation of a dermal papilla anlage and ingrowth of the epidermis. Wnt10b, Bmp2 and Bmp4 continued to be expressed at this time, however. When grafted to nude mice (which lack T cells), Shh mutant skin gave rise to large abnormal follicles containing a small dermal papilla. Although these follicles showed high rates of proliferation and some differentiation of hair matrix cells into hair-shaft-like material, no hair was formed.
Conclusions: Shh signaling is not required for initiating hair follicle development. Shh signaling is essential, however, for controlling ingrowth and morphogenesis of the hair follicle
Spatial and temporal variation in the elemental composition of soil solution from gleyic peaty-podzolic soils
- …