Input-output budgets for dissolved inorganic nitrogen (DIN) are summarized for 24 small watersheds at 15 locations in the northeastern United States. The study watersheds are completely forested, free of recent physical disturbances, and span a geographical region bounded by West Virginia on the south and west, and Maine on the north and east. Total N budgets are not presented; however, fluxes ...

In aquatic ecosystems, carbon (C) availability strongly influences nitrogen (N) dynamics. One manifestation of this linkage is the importance in the dissolved organic matter (DOM) pool of dissolved organic nitrogen (DON), which can serve as both a C and an N source, yet our knowledge of how specific properties of DOM influence N dynamics are limited. To empirically examine the impact of labile ...

The concentration of dissolved inorganic nitrogen (DIN) in the porewaters of shallow-water tropical marine sediments can be as high as 50-100 µM, at sediment depths of shallow as 20 cm. These concentrations are at least two-orders of magnitude greater than the DIN concentration in the overlying water. High porewater concentrations, and the resulting concentration gradient, result in substantial...

Sitele moleculare din carbon (CMS) sunt adsorbanţi carbonici de mare importanţă. Această lucrare prezintă rezultatele studiului privind prepararea sitelor moleculare din carbon şi modificarea structurii porilor. Proprietăţile sitelor moleculare ale varietăţilor de cărbuni au fost studiate prin măsurarea capacităţii de adsorbţie dinamică a dioxidului de carbon utilizând sistemul PSA ( adsorbţia ...

muhammad ibn hamed isfahani more popularly known as imad ad-din al-isfahani was a persian historian, scholar, and rhetorician. he left a valuable anthology of arabic poetry to accompany his many historical works. and worked as a man of letters during the zengid and ayyubid period. he was born in isfahan in the year 1125, and studied at the nizamiyya school in baghdad. he graduated into the bure...

In nitrogen (N)-limited systems, the potential to sequester carbon depends on the balance between N inputs and losses as well as on how efficiently N is used, yet little is known about responses of these processes to changes in plant species richness, atmospheric CO2 concentration ([CO2]), and N deposition. We examined how plant species richness (1 or 16 species), elevated [CO2] (ambient or 560...

We have identified many dark-inducible (din) genes that are expressed in Arabidopsis leaves kept in the dark. In the present study we addressed the question of how plant cells sense the depletion of sugars, and how sugar starvation triggers din gene expression in suspension-cultured cells of Arabidopsis. Depletion of sucrose in the medium triggered marked accumulation of din transcripts. Suppre...

some logicians as avicenna, khaja nasir al-din tusi, and dabiran katebi believe that denotation (dilala) is dependent on volition (irada), and as long as there is no volition, there is no denotation. some others like qutb al-din razi completely reject this idea and maintain that denotation merely depends on “knowledge of designation” (al-ilm bi al-wad’). some of methodologicians of jurisprudenc...

Die Normen DIN EN 61508 und DIN EN 62304 beschreiben Sicherheitsanforderungen für die Entwicklung von Software im medizinischen Umfeld. Diese beinhalten u.a. Vorschriften zur Verifikation und Diagnose (Kapitel C5, DIN EN 61508-7 [Di09]), zur Beurteilung der funktionalen Sicherheit (Kapitel C6, DIN EN 61508-7 [Di09]), zur Implementierung und Verifikation von Software-Einheiten (Kapitel 5.5, DIN ...

Given H a real Hilbert space and Φ : H → R a smooth C function, we study the dynamical system (DIN) ẍ(t) + αẋ(t) + β∇Φ(x(t))ẋ(t) +∇Φ(x(t)) = 0 where α and β are positive parameters. The inertial term ẍ(t) acts as a singular perturbation and, in fact, regularization of the possibly degenerate classical Newton continuous dynamical system ∇Φ(x(t))ẋ(t)+∇Φ(x(t)) = 0. We show that (DIN) is a well-pos...