Simbioznom fiksacijom dušika leguminoze mogu zadovoljiti veliki dio svojih potreba za dušikom na učinkovit i ekološki prihvatljiv način. Rizobije su skupine bakterija tla sa jedinstvenom sposobnošću ...tvorbe kvržica na korijenu leguminoza u kojima pomoću enzima nitrogenaze konvertiraju inertan atmosferski dušik u biljkama pristupačan amonijačni oblik. Pretpostavlja se da su u tlima kontinentalne Hrvatske prisutni autohtoni sojevi rizobija koji noduliraju soju te da se sojevi međusobno razlikuju po fenotipskim i genotipskim svojstvima. U cilju odabira najkvalitetnijih sojeva rizobija sakupljeni su uzorci tla iz tri područja kontinentalne Hrvatske u kojem postoji dugogodišnja tradicija uzgoja soje. Fenotipska karakterizacija uključila je utvrđivanje rasta na različitim temperaturama, pH vrijednostima i rast na različitim koncentracijama soli, biokemijsku karakterizaciju, ispitivanje otpornosti na antibiotike. Fenotipska karakterizacija pokazala je značajnu otpornost na stresne uvjete okoliša, posebno otpornost na niski pH što je izuzetno važno jer Hrvatska ima jako puno kiselih tala. Kao najbolji sojevi pokazali su se sojevi SR1, SR2 te SR3 zbog čega bi ih bilo korisno uključiti u daljnji program selekcije.
The article presents the problem of rapid antigen tests when they become mass waste after use. Based on this, the hypothesis was made that rapid antigen tests can be recycled. Rapid antigen tests, ...which were used in the Covid-19 epidemic to quickly detect infections in the population or to confirm the presence of the Sars-Cov 2 virus in patients, were intended to limit the spread of the epidemic. To confirm the hypothesis of recycling for rapid antigen tests, the LFIA-REC ATP 150 project was prepared, which was selected for co-financing by the Norwegian Fund. Rapid antigen tests consist of a sample and conjugate pad, detectable or nitrocellulose membranes and absorbent pads and a plastic case. The function of the sample pad is to evenly absorb the sample (mucus, blood) and lead it to the conjugate pad with a steady flow. Gold nanoparticles (labels) are deposited on the conjugate pad. The key is that the gold nanoparticles are conjugated with capture molecules capable of binding to potentially present antibodies or virus in the sample. The scope of the research problem thus required the inclusion of various characterization techniques that must be applied to the individual material in the rapid antigen test to subsequently develop an efficient recycling process for the rapid antigen tests. The result of the research presented in this paper represents a newly developed algorithm of characterization techniques, which includes a recommended description of the preparation of samples of key materials from rapid antigen tests. This algorithm successfully achieved the characterization of gold nanoparticles from rapid antigen tests. Based on the developed algorithm, the final part of the project will validate the recycling process of rapid antigen tests, so that they can be recycled, i.e. gold nanoparticles or plastic used in new products. The paper presents the algorithm of characterization techniques with a description of the preparation of material samples from rapid antigen tests.
The paper discusses four Ag-Au-Pd-Cu dental alloys, with different chemical compositions, which are used to produce fixed dental-prosthetic structures. These dental alloys must have a low level of ...biological risk after being implanted in the oral cavity, which means minimal release of ions from their surface, or the absence of corrosion, and, recently, the absence of ferromagnetism has been introduced as an additional requirement. The latter requirement is particularly important when magnetic resonance (MR) is used in the medical diagnosis of a patient who has an implanted fixed dental-prosthetic structure. With this technique, the internal structure of the human body is imaged using a strong magnetic field, radio waves and computer technology. Therefore, the absence of ferromagnetic, embedded biomaterials is necessary in the part of the body where medical diagnostics are performed. Microstructural investigations of four Ag-Au-Pd-Cu dental alloys (Auropal S, Auropal SE, Midor S and Midor SE) and measurements of their magnetic properties were carried out as part of the research. The results showed that Ag-Au-Pd-Cu dental alloys have a stable microstructure, which allows them to be processed later into fixed prosthetic constructions. The measurements of the magnetic properties showed that the Ag-Au-Pd-Cu dental alloys are diamagnetic.
The latest research is about ProsopisJuliflora’s mining and characterization officers. The fibres were cut, chemically treated using sodium and hydrochloric acid (alkali) solutions. Chemically ...modified and non-modified fibres have been analysed for their thermal, chemical, crystalline, electrical, morphological and tensile characteristics. The findings showed that a cellulose content was increased by 59.8 % with a reduction of amorphous content and humidity by chemical treatment with alkali. However, due to its acid-plus attacks whose values were lower than untreated, the treatment for hydrochloric acid reduced cellulosis material. There were four hundred and seventeen nm of crystalline fibre of alkaline therapy, less than one 68.01 nm. Thus the ProsopisJuliflora can be suggested for lightweight polymer applications as a possible reinforcement.
Kvržične bakterije u simbioznim zajednicama s mahunarkama omogućuju značajan unos biološki vezanog dušika u tlo. Veliku važnost ima odabir sojeva koji su otporni na stresne uvjete u tlu. Danas se sve ...više susrećemo s ekstremnim vremenskim uvjetima te je od iznimne važnosti selekcija visoko učinkovitih sojeva kvržičnih bakterija (rizobija) kako bi predsjetvena bakterizacija sjemena mahunarki bila uspješna. Cilj ovog istraživanja bio je utvrditi fenotipske karakteristike sojeva kvržičnih bakterija izoliranih iz kvržica soje u uvjetima koji su izvan optimalnih vrijednosti za njihov rast. Uzorci tla za izolaciju sojeva prikupljeni su s područja Koprivničko-križevačke, Bjelovarsko-bilogorske i Vukovarsko- srijemske županije. Sposobnost rasta sojeva ispitivana je na različitim pH vrijednostima, temperaturama, koncentracijama soli, izvorima ugljikohidrata te je testirana osjetljivost na antibiotike. U svrhu utvrđivanja biokemijskog statusa svakog pojedinog izolata provedena su tri biokemijska testa (oksidaza, ureaza i katalaza) te su istražene morfološke karakteristike izolata. Utvrđeno je da je većina autohtonih sojeva rizobija iz ovog istraživanja u in vitro uvjetima pokazala značajnu otpornost na ispitivane uvjete, ali i da se međusobno značajno razlikuju po određenim svojstvima. Izolati K2 i K3 iz Koprivničko-križevačke županije pokazali su najveću tolerantnost na povišene koncentracije soli. Od ispitivanih antibiotika, ampicilin je imao najslabiji utjecaj na izolate, dok su na streptomicin izolati bili najosjetljiviji. Dobiveni rezultati ukazuju na značaj selekcije autohtonih sojeva rizobija.
Nodule bacteria in symbiotic communities with legumes allow a significant uptake of biologically fixed nitrogen into the soil. The selection of strains that are resistant to stressful soil conditions is of great importance. Selection of highly efficient strains of nodule bacteria (rhizobia) for successful pre-sowing bacterization of legume seed is especially important today, when we are increasingly faced with extreme weather conditions. The aim of this study was to determine the phenotypic characteristics of strains of nodule bacteria isolated from soybean nodules under conditions that are beyond the optimal values for their growth. Soil samples for strain isolation were collected from Koprivnica-Križevci, Bjelovar- Bilogora and Vukovar-Srijem counties. The ability of strains to grow was tested at different pH values, temperatures, salt concentrations and carbohydrate sources. Antibiotic susceptibility was tested as well. In order to determine the biochemical status of each individual isolate, three biochemical tests (oxidase, urease and catalase) were performed, and the morphological characteristics of the isolates were investigated. It was found that most indigenous strains of rhizobia from this study in vitro showed significant resistance to testing conditions, but they also differ significantly from each other in certain properties. Isolates K2 and K3 from Koprivnica-Križevci county showed the highest tolerance to elevated salt concentrations. From tested antibiotics, ampicillin showed to have the weakest effect on the selected isolates, while the isolates were most sensitive to streptomycin. The obtained results indicate the importance of selection of autochthonous strains of rhizobia.
Kako tematika vezana uz ribarske mreže nije sustavno obrađena u okviru novije stručne i znanstvene literature objavljene u Hrvatskoj, u okviru ovog rada dan je osvrt na tematiku temeljen na novoj ...zakonodavnoj i normativnoj regulativi uz pregled relevantne stručne i znanstvene literature. Prikazan je detaljan pregled podjele ribarskih mreža prema načinu lova, materijalima od kojih se izrađuju (vlakana i pređa) te načinu izrade ribarskih mreža. Kroz pregled normi vezanih uz tematiku istraživanja dan je i pregled osnovnih pojmova vezanih uz ribarske mreže, pojedine elemente mreže te mrežnog oka, kao i načina rezanja, učvršćivanja, spajanja i postavljanja mreža. Opisane su metode za karakterizaciju i redovitu kontrolu kvalitete gotovog proizvoda te ukazano na dimenzijska ograničenja ribolovnih mrežnih alata propisana ulaskom Hrvatske u EU.
Food authenticity in a broader sense means fulfilling chemical and physical criteria prescribed by the proposed legislation. In the case of honey authenticity, two aspects are of major concern: the ...manufacturing process and the labelling of final products in terms of their geographical and botanical origin. A reliable assessment of honey authenticity has been a longterm preoccupation of chemists-analysts and it usually involves the use of several criteria and chemical markers, as well as a combination of analytical and statistical (chemometric) methods. This paper provides an overview of different criteria and modern methods for the assessment of honey authenticity in the case of a statistically significant number of authentic honey samples of several botanical types from various regions of Serbia.
Izvornost hrane u širem smislu znači udovoljavanje kemijskim i fizikalnim kriterijima koji su propisani zakonodavstvom. U pogledu izvornosti meda, dva su ključna aspekta: proizvodni proces i označavanje proizvoda u smislu zemljopisnog i botaničkog podrijetla. Pouzdana procjena izvornosti meda, koja uobičajeno uključuje korištenje nekoliko kriterija i kemijskih markera te kombinaciju analitičkih i statističkih (kemometrijskih) metoda, već dugo vremena zaokuplja pozornost kemijskih analitičara. Ovaj rad pruža uvid u različite kriterije i moderne metode za procjenu izvornosti meda koristeći se slučajem statistički značajnog broja uzoraka izvornog meda nekoliko botaničkih tipova iz različitih regija u Srbiji.
Die zeitgenössische deutsche Schriftstellerin Ruth Berger beschreibt in ihrem Roman Gretchen aus dem Jahre 2007 das Schicksal der jungen Dienstmagd Susanna Margaretha Brand. Im breiten Spektrum ...prominenter historischer Gestalten der Frankfurter Gesellschaft aus der zweiten Hälfte des 18. Jahrhunderts wird der Familie Goethe besondere Aufmerksamkeit geschenkt. In diesem Beitrag werden ihre Figuren charakterisiert und ihre interpersonalen Bezüge im intertextuellen Kontext dargestellt.