Rezultati morfometrijskih i histoloških studija testisa i proizvodnje sperme rasplodnih bikova s različitom reakcijom na stres

The aim of this study was to determine the association between bulls with different resistance to stress and the morphological and histological characteristics of the testicles and epididymis, and quantitative and qualitative indicators of sperm production for the first three years of their use on a regional breeding holding. Based on cortisol concentrations before and after stress, bulls were divided into two groups, the first with higher stress resistance (n=9) and the second with lower stress resistance (n=7). Animals of the second group had a 11.9% higher incidence of rejected sperm due to poor quality. Animals with a higher stress resistance had a 16.6% larger relative area of the seminal canals, higher weight of the testicles, larger size of the testicles, in both length and width, higher weight of the testicular appendage, and better development of the two testicular appendages. The adaptive capacity of breeding bulls should be selectively improved to evaluate their stress resistance according to the cortisol concentrations before and one hour after stress. When completing herds, it is preferable to use animals with a higher resistance to stress.Cilj našeg istraživanja bio je utvrditi vezu između bikova različite otpornosti na stres i morfoloških i histoloških karakteristika testisa, njihovog epididimisa, kvantitativnih i kvalitativnih indikatora stvaranja sperme za prve tri godine njihove uporabe u regionalnom rasplodnom gospodarstvu. Temeljem različite dinamike kortizola prije i nakon stresa, bikovi su podijeljeni u skupine: prva skupina većom otpornošću na stres (n=9) i druga skpina s manjom otpornošću na stres (n=7). Životinje druge skupine imale su 11,9% veću učestalost odbačenog sjemena zbog loše kvalitete. Životinje prve skupine koje su bile otpornije na stres imale su veću relativnu površinu sjemenovoda za 16,6 %, veću masu i veličinu testisa, a i opseg testisa je bio veći. Razlikovali su se i u veličini mase testikularnih privjesaka i oba testikularna privjeska su bila bolje razvijena u žitotinja prve skupine. Predlažemo selektivno povećati kapaciteta prilagodbe rasplodnih bikova i procijenu njihovu otpornost na stres prema dinamici koncentracije kortizola prije i sat vremena nakon stresa. Prilikom remonta stada, preporučumo korištenje životinja s većom otpornošću na stres

The effect of magneto-crystalline anisotropy on the properties of hard and soft magnetic ferrite nanoparticles

Recent advances in the field of magnetic materials emphasize that the development of new and useful magnetic nanoparticles (NPs) requires an accurate and fundamental understanding of their collective magnetic behavior. Studies show that the magnetic properties are strongly affected by the magnetic anisotropy of NPs and by interparticle interactions that are the result of the collective magnetic behavior of NPs. Here we study these effects in more detail. For this purpose, we prepared CoxFe3-xO4 NPs, with x = 0-1 in steps of 0.2, from soft magnetic (Fe3O4) to hard magnetic (CoFe2O4) ferrite, with a significant variation of the magnetic anisotropy. The phase purity and the formation of crystalline NPs with a spinel structure were confirmed through Rietveld refinement. The effect of Co doping on structure, morphology and magnetic properties of CoxFe3-xO4 samples was investigated. In particular, we examined the interparticle interactions in the samples by delta m graphs and Henkel plots that have not been reported before in literature. Finally, we studied the hyperthermia properties and observed that the heat efficiency of soft Fe3O4 is about 4 times larger than that of hard CoFe2O4 ferrite, which was attributed to the high coercive field of samples compared with the external field amplitude.The University of Tabriz is acknowledged for financial support. The authors thank to Dr. I. Orue from Sgiker (UPV/EHU) and Prof. P. Kameli from Isfahan University of Technology for technical and human support

Temperature Dependent Stress–Strain Behavior and Martensite Stabilization in Magnetic Shape Memory Ni51.1Fe16.4Ga26.3Co6.2 Single Crystal

The superelastic properties and stress-induced martensite (SIM) stabilization have been studied in a shape memory Ni51.1Fe16.4Ga26.3Co6.2 single crystal. The single crystal, characterized by a thermally induced forward martensitic transformation temperature around 56 °C in the initial state, has been submitted to compression mechanical testing at different temperatures well above, near and below the martensitic transformation (MT). After each mechanical test, the characteristic MT temperatures and the transformation enthalpy have been monitored by means of differential scanning calorimetry. At temperatures below MT, the stress–strain (σ–ε) curves show a large strain, around 6.0%, resulting from the detwinning process in the martensitic microstructure, which remains accumulated after unloading in the detwinned state of the sample as a typical behavior of the shape memory alloys (SMAs). After just two “σ–ε + heating” cycles the accumulation of strain was not observed any more indicating the formation of a two-way shape memory effect which consists in a spontaneous recovery of the aforementioned detwinned state of the sample during its cooling across the forward MT. Whereas the thermally induced shape recovery in conventional SMAs occurs at the fixed value of the reverse MT temperature, the heating DSC curves of the mechanically deformed martensite in the present work show a burst-like calorimetric peak at the reverse MT arising at temperatures essentially higher than the thermally activated one. This behavior is the result of the SIM stabilization effect. After a short thermal aging in the stress-free state, this effect almost disappears, showing a slight impact on the MT characteristic temperatures and the enthalpy. At temperatures higher than the transformation one, the SIM is not stabilized, as the mechanically induced martensite fully retransforms into austenite after the unloading. From the σ–ε curves, the critical stress, σc, as well as the values of Young’s moduli of martensite and austenite are determined showing linear dependences on the temperature with a slope of 3.6 MPa/°C.This research has been carried out with the financial support of the Spanish Ministry of Science, Innovation and Universities (project RTI2018-094683-B-C53-54) and Basque Government Department of Education (project IT1245-19) and in the framework of INNOSMAD ID546749 Project, PROGRAMMA DI COOPERAZIONE INTERREG V-A ITALIA SVIZZERA CCI 2014TC16RFCB035. s

Magnetic field-induced rubber-like behavior in Ni-Mn-Ga particles/polymer composite

Single crystalline Ni-Mn-Ga is well known as a prototype ferromagnetic shape memory alloy (FSMA) exhibiting a giant magnetic field-induced strain (MFIS), up to 12%, due to the magnetically driven twin boundary rearrangement. The large stroke and fast magnetomechanical response make it important for actuators and sensors. Polycrystalline Ni-Mn-Ga is inexpensive and technologically easy accessible, but constrains from the grain boundaries inhibit the twin boundary motion, whereby a very low MFIS is observed. Here, we have shown for the first time that a polycrystalline Ni-Mn-Ga can be split into the magnetostrain-active single grains which, being specially assembled in a silicone polymer matrix, caused large and fully reversible MFIS of the resulting composite. We termed the unique reversibility of a large MFIS of the composite as the magnetic field-induced rubber-like behavior. The magnetostrain of individual particles was explored by the X-ray mu CT 3D imaging. The results suggest novel solutions for development of the low cost magnetic actuators and sensors for haptic applicationThis work was supported by Grant-in-Aid of Scientific Research (Kiban S 26220907) from the Japan Society for the Promotion of Science, as well as by Spanish Ministry of Economy and Competitiveness (MAT2014-56116-C4-3-4R). We are grateful to Mr. H. Tanimura for technical support and Mr. H. Kawabe for help in calculations

La Seguridad Económica del Estado: Su Génesis y los Enfoques de Transformación de la Modernidad

The relevance of this article is due to the fact that the economic security of the state is a key component of the national security system and a major factor in ensuring national interests. The purpose of the article is to conduct a scientific study on the definition of the administrative and legal mechanism of ensuring economic security in Ukraine by borrowing the positive experience of foreign countries. The leading research methods are general scientific and special research methods, including methods of logic, analysis, comparison etc. The results of this study are a comparative legal analysis of the functioning of the economic security system in Ukraine and EU countries, analysis of the transformation of economic security in European countries, search for promising ways of transformation and reform in Ukraine. The significance of the obtained results is reflected in the fact that this study may serve as a basis for outlining future changes to the current legislation of Ukraine on the functioning of economic security in Ukraine.  La relevancia de este artículo se debe al hecho de que la seguridad económica del estado es un componente clave del sistema de seguridad nacional y un factor importante para garantizar los intereses nacionales. El propósito del artículo es realizar un estudio científico sobre la definición del mecanismo administrativo y legal para garantizar la seguridad económica en Ucrania tomando prestada la experiencia positiva de países extranjeros. Los principales métodos de investigación son los métodos generales de investigación científica y especial, incluidos los métodos de lógica, análisis, comparación, etc. Los resultados de este estudio son un análisis jurídico comparativo del funcionamiento del sistema de seguridad económica en Ucrania y países de la UE, análisis de la transformación. de seguridad económica en los países europeos, busque formas prometedoras de transformación y reforma en Ucrania. La importancia de los resultados obtenidos se refleja en el hecho de que este estudio puede servir como base para delinear futuros cambios a la legislación actual de Ucrania sobre el funcionamiento de la seguridad económica en Ucrania

The Economic Security of the State: its Genesis and the Transformation Approaches of the Modernity

The relevance of this article is due to the fact that the economic security of the state is a key component of the national security system and a major factor in ensuring national interests. The purpose of the article is to conduct a scientific study on the definition of the administrative and legal mechanism of ensuring economic security in Ukraine by borrowing the positive experience of foreign countries. The leading research methods are general scientific and special research methods, including methods of logic, analysis, comparison etc. The results of this study are a comparative legal analysis of the functioning of the economic security system in Ukraine and EU countries, analysis of the transformation of economic security in European countries, search for promising ways of transformation and reform in Ukraine. The significance of the obtained results is reflected in the fact that this study may serve as a basis for outlining future changes to the current legislation of Ukraine on the functioning of economic security in Ukraine

Magnetostructural transition and magnetocaloric effect in MnNiGe1.05 melt-spun ribbons

"Alloy ribbons of nominal composition MnNiGe1.05 were produced using the melt-spinning technique. As-quenched (aq) polycrystalline ribbons are single-phase showing the hexagonal Ni2In-type crystal structure. After thermal annealing at 1148 K, the formation of the orthorhombic TiNiSi-type crystal structure by martensitic transformation is favored. However, XRD patterns for different temperatures indicate that the phase transition from hexagonal to orthorhombic structure is incomplete. The starting and finishing temperatures for the direct and reverse martensitic transformation for aq (annealed) samples determined by DSC were MS = 264 (268) K Mf = 235 (255) K, AS = 259 (266) K, and Af = 289 (276) K. Across this structural phase transition the annealed sample undergoes a drop in magnetization giving rise to a narrow temperature dependence of the magnetic entropy change with a peak value on heating (cooling) of 5.8 (4.8) Jkg−1K−1 for a field change of 5 T.

Usage of immediate implantation method with immediate load using osteoplastic xenogenic materials (literature review)

В даній статті проведено аналіз методики безпосередньої імплантації з негайним навантаженням та порівняльна характеристика якісних властивостей остеопластичних матеріалів Біопласт-Дент “ВладМіВа”(Россія), Остеопласт НПК “ВИТАФОРМ“ (Россія), Cerabone “Botiss GmbH” (Німеччина), Biо-Оss “Geistlich” (Швейцарія), наведена класифікація та проаналізовані їх переваги і недоліки.В данной статье проведено анализ методики непосредственной имплантации с немедленной нагрузкой и сравнительную характеристику качественных свойств остеопластических материалов Биопласт-Дент "ВладМиВа" (Россия), Остеопласт НПК "ВИТАФОРМ" (Россия), Cerabone "Botiss GmbH" (Германия), Biо-Оss "Geistlich" (Швейцария), приведена классификация и проанализированы их преимущества и недостатки.Relevance of this work is the solution to the emerging problems with the help of xenogeneous osteoplastic materials using immediate implantation technique with immediate load. We used electronic databases PubMed/Medline, Science Direct, Google Scholar, RISC to analyze researches on immediate dental implantation with immediate load and we analyzed osteoplastic materials with their advantages and disadvantages taking into account the process of osteointegration. The proposed modern methods of implantation have led to new deficiencies associated with poor osteointegration and a negative aesthetic result. Thus, in the method of immediate implantation with immediate load, the problem zone was represented by cervical area. Given tissue deficits, there is much worse restoration of bone tissue in this area and the preservation of the walls of the alveoli, eliminating the possibility of displacement of the muco-periosteal flap, especially from the vestibular surface, where the bone layer is considerably thinned. The acceleration of osteogenesis with the common resorption of the osteoplastic material is a wishful phenomenon of osteointegration. A more predicted result will be usually with an autogenous material. The disadvantage of its use is the additional surgical intervention, and the impossibility of taking the material in enough quantities in each clinical case. The popularity of the use of xenogeneous materials is due to the presence of osteoinductive properties. There are quite a few different manufacturers involved in the manufacture of xenogeneous materials. But despite the similarity in morphological characteristics, osteoinductive action at the stages of osteointegration in each sample is individual. Existing techniques for directed bone regeneration, namely the combination of soft tissue management and the use of osteoplastic materials, are not always suitable in each individual clinical case. The behavior of the osteoplastic material itself under conditions of permissible threshold of microroughness is also not investigated. Therefore, there is no consensus on the benefits of this or that xenogenic material. The need for additional morphological and clinical studies is obvious

Спосіб зняття відбитка зі щелепи з імплантатами

Спосіб зняття відбитка зі щелепи з імплантатами, що включає виготовлення і припасування індивідуальної або стандартної відбиткової ложки, фіксацію трансферів на довгих лабораторних гвинтах, введенні відбиткової маси в зону розташування імплантатів, а після закінчення полімеризації відбиткової маси зняття ложки та виведення відбитку з ротової порожнини, який відрізняється тим, що до введення відбиткової маси на поверхні ложа імплантації створюють надтонкий двошаровий бар'єр за допомогою адгезиву для м'яких тканин та рідкого кофердаму