Petrogenetic significance of ocellar camptonite dykes in the Ditrau Alkaline Massif, Romania

Camptonite dykes intrude the rift-related Mesozoic igneous body of the Ditrău Alkaline Massif, Eastern Carpathians, Romania. We present and discuss mineral chemical data, major and trace elements, and the Nd isotopic compositions of the dykes in order to define their nature and origin. The dykes are classified as the clinopyroxene-bearing (camptonite–I) and clinopyroxene-free (camptonite–II) varieties. Camptonite–I consists of aluminian–ferroan diopside phenocrysts accompanied by kaersutite, subordinate Ti-rich annite, albite to oligoclase and abundant calcite–albite ocelli. Camptonite–II comprises K-rich hastingsite to magnesiohastingsite, Ti-rich annite, albite to andesine, abundant accessory titanite and apatite, and silicate ocelli filled mainly with plagioclase (An4-34). Age-corrected 143Nd/144Nd ratios vary from 0.51258 to 0.51269. The high εNd values of +4.0 to +6.1 which are consistent with intra-plate composition, together with light rare earth element (LREE), large ion lithophile element (LILE) and high field strength element (HFSE) enrichment in the camptonites is ascribed to the formation of small melt batches of a metasomatised sub-lithospheric mantle source. The presence of an asthenospheric ‘high μ’ ocean island basalt (HIMU–OIB)-type mantle component in the source region has also been revealed. A 1–4% degree of partial melting of an enriched garnet lherzolite mantle source containing pargasitic amphibole followed by fractionation is inferred to have been involved in the generation of the camptonites. They are deduced to be parental melts to the Ditrău Alkaline Massif

Mezozóos alkáli magmatizmus a Kárpát régióban: a Ditrói Alkáli Masszívum petrogenezise = Mesozoic alkaline magmatism in Carpathian region: petrogenesis of the Ditró Alkaline Massif

A Ditrói Alkáli Masszívum a Keleti-Kárpátok központi kristályos kőzettömegébe nyomult be, és ezekkel a metamorf kőzetekkel együtt vett részt az alpi tektonikai eseményekben. Szerkezetileg a Bukovinai takaróhoz tartozik, annak négy prekambriumi, kora paleozóos litológiai egységével érintkezik. A terepi (térképezési), petrográfiai, geokémiai, izotóp-geokémiai, cirkonmorfológiai, fluidzárvány és mikrotermometriai, raman spektroszkópiai valamint kormeghatározási vizsgálatok és adatok alapján a Ditrói Alkáli Masszívum kialakulása egy kontinentális autonom magmás aktivizációhoz köthető. A magmatizmus a kontinentális kéreg kialakulása utáni, az intruzó a platform alapzatát átszelő mélytörések mentén alakult ki. Ez a magmatizmus sokféle alkáli (miaszkitos) kőzetegyüttest produkált. A Tarnica Komplexum Kőzetei (peridotitok, gabbrók), a nefelinszienitek és gránitok közel azonos időben keletkezett, komagmás kőzetek. Ez a magmás tevékenység a középső-triász extenziós tektonikai környezetben, a dél-európai passzív kontinentális szegélyen, köpenyeredetű magma felemelkedésével indult. A Bukovinai-Géta mikrokontinensnek az európai platformtól a jurában történő elszakadásával, a Civcin - Severin riftrendszer mentén egy újabb, köpeny eredetű, intrúzió jött létre. Az így keletkezett szienitek az első magmás folyamat kogenetikus kőzeteivel keveredve egy sor hibrid kőzetet eredményeztek (dioritok, monzonitok). | The formation of the Ditró Alkaline Massif can be related to continental magmatic activation. The process started in the Middle Triassic at the Southern passive edge of the European continent in an extensional tectonic environment by the uplift of mantle origin magma, producing various types of petrologic associations. The rocks of the Tarnica Complex (nepheline syenites and granites) are comagmatic as they were formed almost simultaneously. By the Jurassic detachment of the Bukovina-Géta microcontinent from the European platform a new, mantle origin intrusion developed. The mixing of syenites of this formation with the rocks of the first magmatic phase resulted various hybrid rocks

dUTPase expression correlates with cell division potential in Drosophila melanogaster

dUTPase is a dNTP sanitizing enzyme that prevents the appearance of the potentially harmful uracil bases in DNA by hydrolyzing cellular dUTP. This function of dUTPase is found to be essential in many organisms including Drosophila melanogaster. Previously we showed that the expression pattern of dUTPase determines the extent of uracil accumulation in the genome of different tissues. We wished to reveal the regulatory mechanism that eventually leaves a set of tissues to have uracil-free and intact genome. We found that the expression pattern established by the promoter of Drosophila dUTPase overlaps with mRNA and protein expression pattern, excluding the involvement of other posttranscriptional contribution. This promoter was found to be active in primordial tissues, such as in imaginal discs of the larvae, in the larval brain and in reproductive organs. In the case of brain and imaginal tissues, we observed that the promoter activity depends on DRE motifs, the docking site of DREF, which is known as a transcriptional activator of genes involved in replication and proliferation. These results suggest that dUTPase expression is fine-tuned to meet the requirements of DNA synthesis, in tissues where the maintenance of genome integrity is of high importance. This article is protected by copyright. All rights reserved

A Theoretical and Experimental Study of an Unsteady Pressure Measuring System

Experiments were performed to determine the frequency response of gas filled instrument tubes, and the results were correlated with a theoretical model. The theoretical model developed by Bergh and Tijdeman for a series connection of thin circular tubes and volumes was studied in full detail and employed. A measuring system was designed and built to measure pressure ratio and phase lag employing thin nylon or vinyl tubes and strain gage transducers. 1\u27leasurements were performed using cathode ray tube, strip chart, analog techniques and also a commercial electronic function analyzer and the various results were compared. The theoretical and experimental influence of different parameters was observed. Dynamic response of the tubes with a terminal cavity was obtained at atmospheric and vacuum static pressure, using air and/or Freon-12 as different filling gases and with and without a terminal, multi-port scanner valve. The theory and experiments displayed the same qualitative dynamic pressure response. Finally an at. tempt was made to develop the theoretical model for a step input pressure disturbance for a series connection of thin circular tubes and volumes