Solid state synthesis of extra phase-pure Li4Ti5O12 spinel

Extra phase-pure Li4Ti5O12 spinel with particle sizes less than 500 nm was synthesized by solid state reaction of mechanochemicaly activated mixture of nano anatase and Li2CO3 for a very short annealing time, 4 h at 800°C. Structural and microstructural properties, the mechanism of solid state reaction between anatase and Li2CO3 as well as thermal stability of prepared spinel were investigated using XRPD, SEM and TG/DSC analysis. The mechanism of reaction implies decomposition of Li2CO3 below 250ºC, formation of monoclinic Li2TiO3 as intermediate product between 400 and 600°C and its transformation to Li4Ti5O12 between 600-800ºC. The spinel structure is stable up to 1000ºC when it is decomposed due to Li2O evaporation

Concentration ratio of coproporphyrine, porphobilinogen and deltaaminolevulinic acid in the urine of workers exposed to lead

Izvršeno je određivanje koproporfirina, delta-aminolevulinske kiseline i porfobilinogena u urinu grupe od sto radnika izloženih olovu. Utvrđeno je da koncentracije delta-aminolevulinske kiseline i porfobilinogena rastu s porastom koncentracije koproporfirina. Zaključuje se da su povišene koncentracije delta-aminolevulinske kiseline i porfobilinogena koristan dodatni indeks povišene apsorpcije olova u organizmu.Concentrations of coproporphyrine, deltaaminolevulinic acid and porphobilinogen were determined in the urine of a graup of 100 workers exposed to lead. It was established that deltaaminolevulinic acid and porphobilinogen concentrations grow with the increase of coproporphyrine concentration. Conclusion has been drawn that increased concentrations of deltaaminolevulinic acid and porphobilinogen present a useful additional index for increased lead absorption in the organism

Prilog laboratorijskoj dijagnostici ranog saturnizma

With regard to the difficulties encountered in the diagnosis of early saturnism the authors have developed a diagnostic test consisting of the peroral administration of 3 g of Ca2EDTA (3 X 1 g per day). If urinary lead excretion is after that found to amount to more than 0.340 mg Pb/24 h, it can be considered as indicating the possibility of saturnism.Autori iznose teškoće koje se u praksi susreću kod dijagnosticiranja ranog saturnizrna. Da bi olakšali postavljanje dijagnoze, naročito u slučajevima kad nedostaju \u27klinički znaci trovanja i kad su rezultati laboratorijskih analiza atipični, autori. su izradili jedan dijagnostički test oralnom primenom 3 g Ca2EDT A (3 X 1 g u toku jednog dana). Ukoliko se posle davanja ove količine Ca2EDTA izluči urinom više od 8,340 mg Pb/24h, postoji opravdana sumnja da u organizmu postoje depoi olova, bez obzira na dužinu ekspozicije radnika olovu. Do ovih zaključaka se došlo posle ispitivanja dejstva EDTA na zdravim osobama, grafičkim radnicima i topioničarima olova, a ovaj test je dobio svoju punu potvrdu na jednoj grupi bivših topioničara olova koji već prosečno pet godina nisu imali nikakvog kontakta tj. olovom

Towards understanding intermolecular interactions in hydantoin derivatives: the case of cycloalkane-5-spirohydantoins tethered with a halogenated benzyl moiety

A series of cycloalkane-5-spirohydantoins bearing a halogeno substituted benzyl group (X = Cl and Br) in position 3 has been synthesized and their structures (1-6) have been determined by a single crystal X-ray diffraction method. These compounds have multiple functional groups, which allow greater competition and/ or cooperation among the different intermolecular interactions in the formation of their crystal structures. The molecules are linked together by paired N-H... O hydrogen bonds in R22(8) rings, while the CH. O interactions lead to their further association into double chains. The contribution of the cycloalkyl ring depends on its conformational flexibility and the multiple C-H donor implications. In the case of compounds 1-4 bearing the cyclopentyl or the cyclohexyl ring, halogen bonding (X...O) interactions give rise to a supramolecular pseudo-hexagonal network. In addition, the C-H... X interactions with a higher degree of multifurcation at the halogen acceptor have an important role in the formation of the crystal structure. Regarding compounds 5 and 6 with the cycloheptane ring, the X. O interaction is absent, and along with the C-H. X interactions, these compounds realize an alternative crystal structure with an emphasis on the X. p interactions. The lattice energies of all these crystal structures, as well as the intermolecular pair energies, have been calculated using PIXEL and further partitioned into coulombic, dispersive, polarization and repulsive factors. The crystal structures have also been subjected to Hirshfeld surface analysis which reveals that approximately 75% of the close contacts correspond to relatively weak interactions. The application of both concepts has provided a new insight into the relationship between the molecular interactions and crystal structures of the hydantoin derivatives.This is the peer-reviewed version of the following article: Crystengcomm, 2017, 19, 3, 469-483 [https://dx.doi.org/10.1039/C6CE02210C][http://cer.ihtm.bg.ac.rs/handle/123456789/2204

Comparative muscle transcriptome associated with carcass traits of Nellore cattle.

Commercial cuts yield is an important trait for beef production, which affects the final value of the products, but its direct determination is a challenging procedure to be implemented in practice. The measurement of ribeye area (REA) and backfat thickness (BFT) can be used as indirect measures of meat yield. REA and BFT are important traits studied in beef cattle due to their strong implication in technological (carcass yield) and nutritional characteristics of meat products, like the degree of muscularity and total body fat. Thus, the aim of this work was to study the Longissimus dorsi muscle transcriptome of Nellore cattle, associated with REA and BFT, to find differentially expressed (DE) genes, metabolic pathways, and biological processes that may regulate these traits

NEDD4: a putative candidate gene for ribeye area in Nellore steers.

Editores: Luiz Lehmann Coutinho, ESALQ/USP; Luciana Correia de Almeida Regitano, Embrapa Pecuária Sudeste; Gerson Barreto Mourão, ESALQ/USP; Aline Silva Mello Cesar, ESALQ/USP; Bárbara Silva Vignato, FZEA/USP; Mirele Daiana Poleti, ESALQ/USP; Wellison Jarles da Silva Diniz, UFSCar

Gene co-expression network analysis associated with carcass traits in Nellore steers.

Carcass traits are influenced by a complex network of gene interactions in muscle, so elucidating the relationships between genes and how these genes influence these traits is crucial for understanding the muscle development in animals