ترتبط كثير من العناصر الأثرية في الفوسفورايت بوجود المعادن الطينية المصاحبة للمعادن الفوسفاتية (الفرانكولايت). وعلى الرغم وجودها بتراكيز قليلة إلا إنها تفسر بشكل واضح توزيع السحنات لتكوين عكاشات الصحراء الغربية العراقية. ويعتقد على الأغلب إن هذه هي الباليكورسكايت والسيبيولايت والمونتموريللونايت التي ترافق تكوين الفرانكولايت البيئات البحرية الضحلة الجرف القاري. تترافق مع الفوسفات أما حبيبات منفص...

in this paper the synthesis of some new polyaromatic monocyclic β-lactams has been reported. these cycloadducts have been synthesized by the [2+2] ketene-imine cycloaddition reaction known as the staudinger reaction. all of the products have been fully characterized by ir, 1h-nmr, 13c-nmr, mass spectroscopy and elemental analyses. the x-ray crystal structure of a cis β-lactam has been also pres...

In the structure of the title compound, C(20)H(34)O(2)Si, a cis,trans,cis,cis-[4.5.5.5]fenestrane derivative, the geometry of the central C(C)(4) substructure shows considerable distortion from an ideal tetra-hedral arrangement towards planarity, with two opposite bridgehead bond angles of 128.87 (18) and 122.83 (17)°. The other bridgehead angle of the trans-bicyclo-[3.3.0]octane subunit is als...

Abstract With louder demands in public discourse for action on adaptation to climate change, efforts improve the provision and use of information services (CIS) are also gaining prominence. Drawing literature about uptake CIS risk assessment adaptation, plus our own practical experiences, this Essay examines modes user-provider interaction CIS. By employing a customer-tailor analogy, three over...

The growing interest in alternative fuels based on plant oils has led to the search for new species. Given this, during 2015–2020, oil from 12 varieties of oilseed radish was studied using standard research protocols. average content dominant fatty acids was: [cis-9] oleic (C 18:1) 33.95% (Cv = 14.2%), [cis-9,12] linoleic 18:2) 16.20% 20.8%), [cis-13] erucic 22:1) 15.18% 17.9%), [cis-9, 12, 15]...