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At least 19 records

All sources NASA NTRS DOE OSTI

DOE OSTI2019

Creating Stable Productive CSE Software Development and Integration Processes in Unstable Environments on the Path to Exascale.

Abstract not provided.

Bartlett, Roscoe↗

DOE OSTI2021

Activation of the CaR-CSE/H2S pathway confers cardioprotection against ischemia-reperfusion injury

Ischemia-reperfusion (I/R) injury is a multifactorial process triggered when an organ is subjected to transiently reduced blood supply. The result is a cascade of pathological complications and organ damage due to the production of reactive oxygen species following reperfusion. The present study aims to evaluate the role of activated calcium-sensing receptor (CaR)-cystathionine γ-lyase (CSE)/hydrogen sulfide (H2S) pathway in I/R injury. Firstly, an I/R rat model with CSE knockout was constructed. Transthoracic echocardiography, TTC and HE staining were performed to determine the cardiac function of rats following I/R Injury, followed by TUNEL staining observation on apoptosis. Besides, with the attempt to better elucidate how CaR-CSE/H2S affects I/R, in-vitro culture of human coronary artery endothelial cells (HCAECs) was conducted with gadolinium chloride (GdCl3, a CaR agonist), H{sub 2}O{sub 2}, siRNA against CSE (siCSE), or W7 (a CaM inhibitor). The interaction between CSE and CaM was subsequently detected. Plasma oxidative stress indexes, H2S and CSE, and apoptosis-related proteins were all analyzed following cell apoptosis. We found that H2S elevation led to the improvement whereas CSE knockdown decreased cardiac function in rats with I/R injury. Moreover, oxidative stress injury in I/R rats with CSE knockout was aggravated, while the increased expression of H2S and CSE in the aortic tissues resulted in alleviated the oxidative stress injury. Moreover, increased H2S and CSE levels were found to inhibit cell apoptotic ability in the aortic tissues after I/R injury, thus attenuating oxidative stress injury, accompanied by inhibited expression of apoptosis-related proteins. In HCAECs following oxidative stress treatment, siCSE and CaM inhibitor were observed to reverse the protection of CaR agonist. Coimmunoprecipitation assay revealed the interaction between CSE and CaM. Taken together, all above-mentioned data provides evidence that activation of the CaR-CSE/H2S pathway may confer a potent protective effect in cardiac I/R injury.

60 APPLIED LIFE SCIENCES↗

DOE OSTI2020

Materials Data on CSe(ClF)3 by Materials Project

CSe(ClF)3 crystallizes in the orthorhombic Pbca space group. The structure is zero-dimensional and consists of eight CSe(ClF)3 clusters. there are two inequivalent C2+ sites. In the first C2+ site, C2+ is bonded in a trigonal non-coplanar geometry to three F1- atoms. There is one shorter (1.33 Å) and two longer (1.34 Å) C–F bond length. In the second C2+ site, C2+ is bonded in a trigonal non-coplanar geometry to three F1- atoms. There is one shorter (1.33 Å) and two longer (1.34 Å) C–F bond length. There are two inequivalent Se4+ sites. In the first Se4+ site, Se4+ is bonded in a rectangular see-saw-like geometry to four Cl1- atoms. There are a spread of Se–Cl bond distances ranging from 2.22–2.71 Å. In the second Se4+ site, Se4+ is bonded in a rectangular see-saw-like geometry to four Cl1- atoms. There are a spread of Se–Cl bond distances ranging from 2.25–2.64 Å. There are six inequivalent Cl1- sites. In the first Cl1- site, Cl1- is bonded in a single-bond geometry to one Se4+ atom. In the second Cl1- site, Cl1- is bonded in a distorted single-bond geometry to one Se4+ atom. In the third Cl1- site, Cl1- is bonded in a distorted single-bond geometry to one Se4+ atom. In the fourth Cl1- site, Cl1- is bonded in a 2-coordinate geometry to two Se4+ and two F1- atoms. Both Cl–F bond lengths are 3.10 Å. In the fifth Cl1- site, Cl1- is bonded in a 1-coordinate geometry to one Se4+ atom. In the sixth Cl1- site, Cl1- is bonded in a 2-coordinate geometry to two Se4+ and two F1- atoms. There are one shorter (3.09 Å) and one longer (3.10 Å) Cl–F bond lengths. There are six inequivalent F1- sites. In the first F1- site, F1- is bonded in a single-bond geometry to one C2+ and one Cl1- atom. In the second F1- site, F1- is bonded in a single-bond geometry to one C2+ and one Cl1- atom. In the third F1- site, F1- is bonded in a single-bond geometry to one C2+ and one Cl1- atom. In the fourth F1- site, F1- is bonded in a single-bond geometry to one C2+ atom. In the fifth F1- site, F1- is bonded in a single-bond geometry to one C2+ atom. In the sixth F1- site, F1- is bonded in a single-bond geometry to one C2+ and one Cl1- atom.

36 MATERIALS SCIENCE↗

DOE OSTI2016

Origin of selenium–gold interaction in F{sub 2}CSe⋯AuY (Y = CN, F, Cl, Br, OH, and CH{sub 3}): Synergistic effects

Selenium–gold interaction plays an important role in crystal materials, molecular self-assembly, and pharmacochemistry involving gold. In this paper, we unveiled the mechanism and nature of selenium–gold interaction by studying complexes F{sub 2}CSe⋯AuY (Y = CN, F, Cl, Br, OH, and CH{sub 3}). The results showed that the formation of selenium–gold interaction is mainly attributed to the charge transfer from the lone pair of Se atom to the Au—Y anti-bonding orbital. Energy decomposition analysis indicated that the polarization energy is nearly equivalent to or exceeds the electrostatic term in the selenium–gold interaction. Interestingly, the chalcogen–gold interaction becomes stronger with the increase of chalcogen atomic mass in F{sub 2}CX⋯AuCN (X = O, S, Se, and Te). The cyclic ternary complexes are formed with the introduction of NH{sub 3} into F{sub 2}CSe⋯AuY, in which selenium–gold interaction is weakened and selenium–nitrogen interaction is strengthened due to the synergistic effects.

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CH↗

DOE OSTI2020

Materials Data on CsAsH6(CSe)2 by Materials Project

CsAsH6(CSe)2 crystallizes in the monoclinic C2/c space group. The structure is three-dimensional. Cs1+ is bonded in a 6-coordinate geometry to six equivalent Se2- atoms. There are a spread of Cs–Se bond distances ranging from 3.73–3.80 Å. C is bonded to one As3- and three H1+ atoms to form distorted corner-sharing CAsH3 tetrahedra. The C–As bond length is 1.97 Å. All C–H bond lengths are 1.10 Å. As3- is bonded in a tetrahedral geometry to two equivalent C and two equivalent Se2- atoms. Both As–Se bond lengths are 2.31 Å. There are three inequivalent H1+ sites. In the first H1+ site, H1+ is bonded in a single-bond geometry to one C atom. In the second H1+ site, H1+ is bonded in a single-bond geometry to one C atom. In the third H1+ site, H1+ is bonded in a single-bond geometry to one C atom. Se2- is bonded in a distorted single-bond geometry to three equivalent Cs1+ and one As3- atom.

36 MATERIALS SCIENCE↗

DOE OSTI2013