Adding SMP support to fastpaths in an L4 microkernel

Fastpaths are a method of optimization which relies on treating the most commonly executed cases of certain functions in a privileged manner, such that behaviour is not modified, but execution time is reduced.Fastpaths play an important role on improving paravirtualization performance offered by an L4 microkernel.In this article we redesign two existing fastpaths in an L4 microkernel for the purpose of adding SMP support.We then put these fastpaths through a series of regression and performance tests to determine if the design is correct and what performance benefits we can expect by using them on a multiprocessor system

HISTO-ANATOMICAL INVESTIGATION ON LYSIMACHIA PUNCTATA L. (PRIMULACEAE) SPECIES

This paper presents the histo-anatomical investigation on the roots, rhizomes, aboveground stems and leaves of Lysimachia punctata species. In addition, the pharmacological importance of Lysimachia sp. is highlighted by modern and cutting-edge researches

HISTO-ANATOMICAL AND PRELIMINARY CHROMATOGRAPHIC ANALYSIS ON POLYGALA VULGARIS L. (POLYGALACEAE) SPECIES

The paper highlights the histo-anatomical investigation of root, rhizome, aboveground stem and leaf of Polygala vulgaris L. (Polygalaceae) species, harvested in August 2016, from southern Romania, as well as the preliminary thin-layer chromatographic analysis of the polyphenols content of the aerial parts (Polygalae vulgaris herba). Rutin was identified and quantified starting from the 11 TLC fingerprint bands

HISTO-ANATOMICAL AND PRELIMINARY TLC INVESTIGATIONS ON TRIBULUS TERRESTRIS L. (ZYGOPHYLLACEAE) SPECIES

Using microphotography technique, the cross-sections of root, aboveground stem and leaf were obtained and investigated for Tribulus terrestris L. (Zygophyllaceae) plants in blossom, collected in June 2016, from the surroundings of Craiova City, Dolj County (southwestern Romania). The polyphenols content of the aerial parts (Tribuli herba) was analyzed by thin layer chromatography. One rutin derivative was identified starting from the 12 peculiar chromatographic bands

HISTO-ANATOMICAL STUDY OF THE ANNUAL OFFSPRING AND LEAF’S LIMB OF VITEX NEGUNDO L. (VERBENACEAE) SPECIES

This paper presents the histo-anatomical study of the annual offspring and leaf’s limb of Vitex negundo species, as an essential stage for the pharmacognostic expertise advancement. The pharmacological importance of the medicinal products (roots, leaves, seeds) obtained from V. negundo was also emphasized

HISTO-ANATOMICAL AND PRELIMINARY TLC INVESTIGATIONS ON HYPERICUM HIRSUTUM L. (HYPERICACEAE) SPECIES

Starting from Hypericum hirsutum L. plants in blossom, harvested in May 2016, from Rasca Forest, Olt County (Romania), the cross-sections of root, aboveground stem and leaf were acquired and examined through microphotography technique. Also, the content of polyphenols was determined by thin layer chromatography as part of a comprehensive pharmacognostic analysis of aerial parts (Hyperici hirsuti herba). From the 12 separated chromatographic bands, one chlorogenic acid derivative was identified

HISTO-ANATOMICAL AND PRELIMINARY TLC INVESTIGATIONS ON CYNOGLOSSUM OFFICINALE L. (BORAGINACEAE) SPECIES

The cross-sections through root, aboveground stem, leaf and sepal of Cynoglossum officinale L. species, Boraginaceae family, harvested from the geographical area of Valea Cernei, Valcea County (Romania), were obtained and interpreted using microphotography technique. In addition, the polyphenols content of the aerial parts (Cynoglossi herba) was analyzed by thin layer chromatography and established for the reason of pharmacognostic expertise. One caffeic acid derivative was identified from the 15 distinctive chromatographic bands

The astrobiology of the anthropocene

A white paper on "Astrobiology Science Strategy" submitted to the National Academy of Sciences.Human influence on the biosphere has been evident at least since the development of widespread agriculture, and some stratigraphers have suggested that the activities of modern civilization indicate a geological epoch transition. The study of the anthropocene as a geological epoch, and its implication for the future of energy-intensive civilizations, is an emerging transdisciplinary field in which astrobiology can play a leading role. Habitability research of Earth, Mars, and exoplanets examines extreme cases relevant for understanding climate change as a planetary process. Energy-intensive civilizations will also face thermodynamic limits to growth, which provides an important constraint for estimating the longevity of human civilization and guiding the search for extraterrestrial intelligence. We recommend that missions concepts such as LUVOIR, HabEx, and OST be pursued in order to make significant progress toward understanding the future evolution of life on our planet and the possible evolution of technological, energy-intensive life elsewhere in the universe.Publisher PD