249 research outputs found
Genetic Variability in Different Lucerne (\u3cem\u3eMedicago Sativa\u3c/em\u3e) Genotypes
One of the basic goals of modern lucerne breeding programmes is creation of new cultivars with a great potential for high quality and stable yields of both forage and hay (Riday & Brummer, 2002). Such cultivars meet increased needs of animal husbandry and must contribute to diverse farming systems (Luki , 2000). Our trial was aimed at determining genetic variability of yield components in 7 lucerne genotypes, as well as at evaluation of their breeding potential as gene donors to new lucerne cultivar
Nano Design of Biphasic ciumphosphate/Poly-Dl-Lactide- Co-Glycolide, as Composite Biomaterials for Hard Tissue Reconstruction
Poster presented at the The Seventh Yugoslav Materials Research Society Conference - YUCOMAT 2005, Herceg Novi, Montenegro, September 12-16, 2005
Single spin-polarised Fermi surface in SrTiO thin films
The 2D electron gas (2DEG) formed at the surface of SrTiO(001) has
attracted great interest because of its fascinating physical properties and
potential as a novel electronic platform, but up to now has eluded a
comprehensible way to tune its properties. Using angle-resolved photoemission
spectroscopy with and without spin detection we here show that the band filling
can be controlled by growing thin SrTiO films on Nb doped SrTiO(001)
substrates. This results in a single spin-polarised 2D Fermi surface, which
bears potential as platform for Majorana physics. Based on our results it can
furthermore be concluded that the 2DEG does not extend more than 2 unit cells
into the film and that its properties depend on the amount of SrO at the
surface and possibly the dielectric response of the system
Legislative framework of nuclear security in the Republic of Serbia
The paper presents the concept and characteristics of nuclear security, the elements of the nu- clear safety strategy, the legislative framework and the most important solutions from the Law on Radiation and Nuclear Safety and Security. At the international level, the most important entity in this field is the International Atomic Energy Agency, while at the national level, most important is the Directorate for Radiation and Nuclear Safety and Security of Serbia. An important role is played by the VinÄa Institute of Nuclear Sciences as the most referential scientific institution in this field, as well as the operational bodies - Nuclear Facilities of Serbia, the Ministry of Internal Affairs, Ministry of Defence, and the Serbian Armed Forces. Engagement of these bodies is carried out in regular peacetime circumstances, emergency situations and wartime. The most important challenges, risks and threats to nuclear security of Serbia were pointed out as well as the need to harmonize norms, procedures and processes in purpose of the strengthening institutional mechanisms in the field of nuclear security
A novel route for identifying starch diagenetic products in the archaeological record
This work introduces a novel analytical chemistry method potentially applicable to the study of archaeological starch residues. The investigation involved the laboratory synthesis of model Maillard reaction mixtures and their analysis through Fourier-Transform Ion Cyclotron Resonance Mass Spectrometry (FTICR-MS). Thus, starch from sixteen plant species were matured while reacting it with the amino acid glycine. The FTICR-MS analysis revealed > 5,300 molecular compounds, with numerous unique heteroatom rich compound classes, ranging from 20 (Zea mays) to 50 (Sorghum bicolor). These classes were investigated as repositories of chemical structure retaining source and process-specific character, linked back to botanical provenance. We discussed the Maillard reaction products thus generated, a possible pathway for the preservation of degraded starch, while also assessing diagenetic recalcitrance and adsorption potential to mineral surfaces. In some cases, hydrothermal experimentation on starches without glycine reveals that the chemical complexity of the starch itself is sufficient to produce some Maillard reaction products. The article concludes that FTICR-MS offers a new analytical window to characterize starchy residue and its diagenetic products, and is able to recognize taxonomic signals with the potential to persist in fossil contexts.Introduction Materials and methods - Sample preparation and characterization - FTICR-MS analysis Results - Characterization of Maillard reaction products based on atomic ratios (H/C, O/C, N/C, N/O) and compound class distribution - Variations in molecular distribution Discussion - The Maillard reaction products - Preservation pathway - Diagenetic recalcitrance of Maillard reaction products Conclusion
Momentum-Resolved Electronic Structure of the High- Superconductor Parent Compound BaBiO
We investigate the band structure of BaBiO, an insulating parent
compound of doped high- superconductors, using \emph{in situ}
angle-resolved photoemission spectroscopy on thin films. The data compare
favorably overall with density functional theory calculations within the local
density approximation, demonstrating that electron correlations are weak. The
bands exhibit Brillouin zone folding consistent with known BiO breathing
distortions. Though the distortions are often thought to coincide with
Bi/Bi charge ordering, core level spectra show that bismuth is
monovalent. We further demonstrate that the bands closest to the Fermi level
are primarily oxygen derived, while the bismuth states mostly contribute
to dispersive bands at deeper binding energy. The results support a model of
Bi-O charge transfer in which hole pairs are localized on combinations of the O
orbitals.Comment: minor changes to text and other figures; includes link to online
Supplemental Material; accepted to Phys. Rev. Let
Trendovi u siliranju leguminoza
Modern trends in legumes ensilaging technology are based on the knowledge of biomass from the aspect of suitability for ensilaging, wilting, addition of carbohydrate feed, use of biological additives, etc. Today, the experiments are conducted, worldwide, with inoculates, which, in addition to homofermentative, also contain heterofermentative lactic acid bacteria. Products of such inoculants contribute to the increase of aerobic stability of silages so their implementation is good for all types of silage. In addition to the usage of those additions, modern technology of silage is based on the maximum mechanization of the ensilaging process, as well as preparing the silage in the form of roto-bales and silo tubes (most inexpensive way of conservation) as well as permanent facilities.Savremeni trendovi u tehnologiji siliranja leguminoza zasnivaju se na poznavanju biomasa sa aspekta pogodnosti za siliranje, provenjavanju, dodavanju ugljenohidratnih hraniva, upotrebi bioloÅ”kih dodataka, i dr. Trenutno se u svetu eksperimentiÅ”e sa inokulantima, koji pored homofermentativnih, sadrže i heterofermentativne bakterije mleÄne kiseline. Produkti ovakvih inokulanata doprinose poveÄanju aerobne stabilnosti silaža, pa su navedeni dodaci aktuelni za sve vrste silaža. Osim koriÅ”Äenja navedenih dodataka, savremena tehnologija siliranja se bazira na maksimalnoj mehanizovanosti celokupnog procesa siliranja, kao i pripremanja silaže u formi roto-bala i silokobasica (najeftiniji vid konzervisanja) kao i stalnih objekata
ViÅ”egodiÅ”nje leguminoze i trave - stabilan izvor kvalitetne kabaste stoÄne hrane
Perennial legumes, alfalfa, red clover, bird's foot trefoil, white clover, sainfoin and grasses, cock's foot, meadow fescue, tall fescue, Italian ryegrass, English ryegrass, French ryegrass, red fescue and Timothy grass can be grown successfully in pure crops and in legume-grass mixtures, on different soil types. Their importance in livestock development is based primarily on the great potential for yield of dry matter of over 20 t ha-1 if adequate agro-technical measures have been applied. Also, perennial legumes are characterized with high content of nutritive substances, especially protein and represent the most important protein source in livestock nutrition. Depending on the species and pheno stage of utilization, the content of crude proteins in grasses varies from 100 to 174,6 g kg-1 of DM, and in perennial legumes from 190,0 to 228,8 g kg-1 of DM. Livestock feed obtained from these plant species can be used in several ways, from grazing as most efficient and economical way, to preparation of hay and high quality silages and haylages. Stated forage species are very important in sustainable agriculture and organic production, considering that they carry out the process of biological fixation of nitrogen, but also from the ecological aspect. By using diverse selection/breeding material numerous domestic cultivars of perennial legumes and grasses have been created which are characterized with high potential for main agronomical traits.ViÅ”egodiÅ”nje leguminoze, lucerka, crvena detelina, žuti zvezdan, bela detelina, esparzeta i trave ježevica, livadski vijuk, visoki vijuk, italijanski ljulj, engleski ljulj, francuski ljulj, crveni vijuk i maÄiji rep, mogu se uspeÅ”no gajiti u Äistom usevu ili u leguminozno-travnim smeÅ”ama, na razliÄitim tipovima zemljiÅ”ta. Njihov znaÄaj u razvoju stoÄarstva, pre svega, se zasniva na visokom potencijalu za prinos suve materije, koji se uz primenu savremenih agrotehniÄkih mera kreÄe i preko 20 t ha-1. Pored toga, viÅ”egodiÅ”nje leguminoze se odlikuju visokim sadržajem hranljivih materija, posebno proteina i predstavljaju najvažniji izvor proteina u ishrani domaÄih životinja. U zavisnosti od vrste i fenofaze iskoriÅ”Äavanja sadržaj sirovih proteina kod trava se kreÄe od 100 do 174,6 g kg-1 SM, a kod viÅ”egodiÅ”njih leguminoza od 190,0 do 228,8 g kg-1 SM. StoÄna hrana dobijena od ovih biljnih vrsta može se koristiti na viÅ”e naÄina, od ispaÅ”e kao najefikasnijeg i najekonomiÄnijeg naÄina, preko pripreme sena, do spravljanja kvalitetnih senaža i silaža. Navedene krmne vrste imaju veoma znaÄajno mesto u održivoj poljoprivredi i organskoj proizvodnji, obzirom da obavljaju proces bioloÅ”ke fiksacije azota, veoma su znaÄajne i sa ekoloÅ”kog aspekta. KoriÅ”Äenjem divergentnog selekcionog materijala stvoren je veliki broj domaÄih sorti viÅ”egodiÅ”njih leguminoza i trava koje se odlikuju visokim potencijalom za osnovna agronomska svojstva
ZnTiO3 Ceramic Nanopowder Microstructure Changes During Compaction
ZnTiO3 nanopowder as a constitutive component in compact production was primarily characterised. Scanning electron micrographs of as received powder were recorded. Mercury porosimetry and nitrogen adsorption were also performed on loose powder. Particle size distribution in a water powder suspension was determined with a laser particle size analyser. Compaction was performed on different pressures in a range from 100 to 400 MPa using the uniaxial double sided compaction technique without binder and lubricant. Micrographs of compacted specimens were obtained using scanning electron microscopy and atomic force microscopy. Pore size distribution was also determined by mercury porosimetry and nitrogen adsorption. Results revealed that with increasing pressure during compaction interagglomerate pores diminish in size until they reach some critical diameter related to the intra-agglomerate pore size
Uticaj bakterijskog inokulanta mleÄne kiseline sa dodatkom enzima i gnjeÄenog jeÄma na kemijski sastav i degradaciju proteina u silaži lucerke
In the experiment, forage (dry matter 216.3 g.kg-1) from the 1st cut of alfalfa (Medicago, sativa L.) cv, Radius, mown at the early flowering stage, was ensiled. Alfalfa was ensiled without inoculants; with lactic acid bacteria and enzyme inoculants; with rolled barley; or with rolled barley and lactic acid bacteria and enzyme inoculants. Rolled barley was added in amounts of 50,100, 150 and 200 g.kg-1 of alfalfa forage, The bacterial acid enzyme inoculants (Bactozym) contained cultures of Lacto bacillus casein, Enterococcus faecium M74 and Pediococcus sp. (a total of 1 5 x 109 CPU in Ig of friable preparation) in the powdered part and the cellulase-hemicellulase complex (25000 n cat. in 1ml) and glucose-oxidase (4000 n cat. in 1ml) in the liquid part. The inoculants was used in a water solution in the amount of 10mg bacterial component and 0,2 ml enzymatic component / kg-1 alfalfa forage. The supplement of only rolled barley to alfalfa forage was found to have no significant effect on improving the processes of proteolysis and deamination in this type of silages, compared to alfalfa silages made with bacterial and enzyme inoculants. Significantly lower crude protein and WSC losses in the fermentation process, increased intensity of lactic acid fermentation, the lack of propionic and butyric acid fermentation, and significantly reduced processes of protein degradation were found in alfalfa-rolled barley silages made with the addition of lactic acid bacteria and enzyme inoculants.U ovom ogledu, silirana je stoÄna hrana (suva materija 216.3 g.kg-1) koja potiÄe od 1. otkosa lucerke (Medicago, sativa L.) cv, Radius, koÅ”ene u ranom stadijumu cvetanja. Lucerka je silirana bez inokulanata; sa bakterijama mleÄne kiseline i enzimskim inokulantom; sa gnjeÄenim jeÄmom; ili sa gnjeÄenim jeÄmom i bakterijom mleÄne kiseline i enzimskim inokulantom. GnjeÄeni jeÄam je dodavan u koliÄinama od 50, 100, 150 200 g.kg-1 stoÄne hrane od lucerke. Bakterijski enzimski inokulant (Bactozym) koji je sadržavao sledeÄe kulture Lacto bacillus casei ,Enterococcus faecium M74 i Pediococcus sp. ( ukupno 15 x IO9 CFU u Ig preparat koji se lako pretvara u prah) u prahu i kompleks celulaza-hemicelulaza (25000 n cat. u l ml) i glukoza-oksidaza (4000 n cat u Iml) u teÄnom delu. Inokulant je koriÅ”Äen u vodenom rastvoru u koliÄini od 10mg bakterijske komponente i 0.2ml enzimske komponente / kg-1 lucerke. Dodavanje samo gnjeÄenog jeÄma lucerkinom krmivu nije imalo znaÄajnog efekta na poboljÅ”anje procesa proteoloze i deaminacije u ovoj vrsti silaže, u poreÄenju sa silažama od lucerke koje su pravljene uz pomoÄ bakterijskih i enzimskih inokulanata. Signifikantno manje sirovog proteina kao i gubici WSC-a u procesu fermentacije, poveÄan intenzitet fermentacije mleÄne kiseline, nedostatak fermentacije propionske i buterne kiseline, i znatno redukovani proces degradacije proteina su pronaÄeni u silaži od lucerke i gnjeÄenog jeÄma uz dodatak bakterije mleÄne kiseline i enzimskog inokulanta
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