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Viqar Uddin Ahmad, Faryal Vali Mohammad, Rasool Bakhsh Tareen
Phytochemical investigation of the aerial parts of Astragalus tephrosioides Boiss. var. lacei (Ali) Kirchoff. (Family Fabaceae) resulted in the isolation of a new cycloartane glycoside laceioside (1). The structure of the previously undescribed compound 1 was established as 16β-acetyloxy-3-O-β-d-glucopyranosyloxy-cycloartan-11α,24ξ, 25-triol. The structure elucidation of compound 1 was based primarily on 1D and 2D-NMR techniques including 1 H and 13 CNMR spectra, DEPT and by 2D COSY, HSQC and HMBC experiments...
March 27, 2018: Natural Product Research
Kathryn F Kirchoff-Torres, Ekaterina Bakradze
PURPOSE OF REVIEW: Cerebral hyperperfusion syndrome (CHS) is a rare but significant complication after carotid revascularization and is increasingly recognized after acute stroke treatments. In this review, we discuss the epidemiology and pathophysiology of CHS, clinical presentation including ipsilateral headache, seizures, and focal neurological deficits, and radiographic presentation. We propose preventive therapies with emphasis on acute stroke post-thrombectomy hyperperfusion. RECENT FINDINGS: CHS was first described after carotid revascularization but is now also reported in patients with acute ischemic stroke...
March 19, 2018: Current Pain and Headache Reports
Barry Sinervo, Donald B Miles, Yayong Wu, Fausto R Méndez de la Cruz, Sebastian Kirchoff, Yin Qi
Determining the susceptibility of species to changing thermal niches is a major goal for biologists. In this paper we develop an eco-physiological model of extinction risk under climate change premised on behavioral thermoregulation. Our method downscales operative environmental temperatures, which restrict hours of activity of lizards, hr , for present-day climate (1975) and future climate scenarios (2070). We apply our model using occurrence records of 20 Phrynocephalus lizards (or taxa in species complexes) drawn from literature and museum records...
February 13, 2018: Integrative Zoology
Mary M Peacock, Evon R Hekkala, Veronica S Kirchoff, Lisa G Heki
Currently one small, native population of the culturally and ecologically important Lahontan cutthroat trout ( Oncorhynchus clarkii henshawi , LCT, Federally listed) remains in the Truckee River watershed of northwestern Nevada and northeastern California. The majority of populations in this watershed were extirpated in the 1940s due to invasive species, overharvest, anthropogenic water consumption and changing precipitation regimes. In 1977, a population of cutthroat trout discovered in the Pilot Peak Mountains in the Bonneville basin of Utah, was putatively identified as the extirpated LCT lacustrine lineage native to Pyramid Lake in the Truckee River basin based on morphological and meristic characters...
November 2017: Royal Society Open Science
Petr Pokorný, Filip Šmejkal, Pavel Kulmon, Pavel Novák, Jiří Novák, Antonín Mikš, Martin Horák, Milan Jirásek
This paper presents a complete model for analysis of the deformed shape of a prestressed circular axisymmetric membrane of a liquid lens. The governing equations are derived using the exact relation between displacements and the Green-Lagrange strains combined with the Saint Venant-Kirchhoff material law, which postulates a linear relation between the Green-Lagrange strains and the second Piola-Kirchoff stresses. A numerical solution based on minimization of potential energy is illustrated by an example, and the dependence of the maximum membrane deflection on material properties and initial prestress is analyzed...
December 1, 2017: Applied Optics
Jerome F Pierson, Matthew C Kirchoff, Susan M Orsega, Scott F Giberson, Betsey R Herpin, Travis W Ready, Michelle L Holshue, Grace G Kelly
The U.S. response to the Ebola epidemic resulted in many federal agencies assessing their ability to respond to global threats and improve the efficiency of humanitarian efforts.
August 2017: Federal Practitioner: for the Health Care Professionals of the VA, DoD, and PHS
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