Optimizing Chiral Selectivity in Practical Life-Detection Instruments

Astrobiology ◽  
2021 ◽  
Author(s):  
Ling Zhang ◽  
Fanjiang Zeng ◽  
Christopher P. McKay ◽  
Rafael Navarro-González ◽  
Henry J. Sun
Keyword(s):  
Chiral Selectivity ◽  
Life Detection ◽  
Practical Life

“Head” Related Phrases In Chinese Language And Their Semantics

2020 ◽  
Vol 2 (08) ◽  
pp. 621-630
Author(s):  
Tair Akimov
Keyword(s):  
Comparative Analysis ◽  
Young People ◽  
Chinese Culture ◽  
Chinese Language ◽  
Semantic Structure ◽  
Chinese People ◽  
Chinese Nation ◽  
Chinese Studies ◽  
Inner World ◽  
Practical Life

Everyone knows that phraseological units are the most popular genre of oral folk art, which was formed as a result of life observations of the ancestors. Learning and analyzing Chinese phraseology allow us to better understand the inner world of the Chinese nation. This article reveals and semantically analyzes aspects of the word “head” that are closely related to Chinese culture. The worldview, deep logical thoughts, feelings, superstitions, lifestyle and environment of the Chinese people are described in phraseological expressions in a concise and clear form. This article discusses the semantics and features of Chinese-language phraseological phrases associated with the word “head”. Chinese-language phrases associated with “head” express meanings such as wisdom and ignorance, process of thinking, cunning,sagacity, and planning. Phraseological units in Chinese linguistics are closely related to practical life and determine such features as philosophical and ideological thinking, logical observation. Taking into account the above, the article provides a comparative analysis of phraseological units related to “head” in Chinese and Uzbek languages. The figurative meanings of the word “head” are being revealed, semantic connections and semantic structure of phrases in the sentence are in the process of learning. Chinese phraseological expressions are poorly studied in Uzbek-Chinese studies. We hope that this work will provide practical assistance to our young people who are learning Chinese.

scholarly journals Identifying molecules as biosignatures with assembly theory and mass spectrometry

2021 ◽  
Vol 12 (1) ◽  
Author(s):  
Stuart M. Marshall ◽  
Cole Mathis ◽  
Emma Carrick ◽  
Graham Keenan ◽  
Geoffrey J. T. Cooper ◽  
...  
Keyword(s):  
Mass Spectrometry ◽  
De Novo ◽  
Outer Space ◽  
Molecular Assembly ◽  
Detection Experiment ◽  
Complex Molecules ◽  
The World ◽  
Life Detection ◽  
Molecular Complexity ◽  
The Universe

AbstractThe search for alien life is hard because we do not know what signatures are unique to life. We show why complex molecules found in high abundance are universal biosignatures and demonstrate the first intrinsic experimentally tractable measure of molecular complexity, called the molecular assembly index (MA). To do this we calculate the complexity of several million molecules and validate that their complexity can be experimentally determined by mass spectrometry. This approach allows us to identify molecular biosignatures from a set of diverse samples from around the world, outer space, and the laboratory, demonstrating it is possible to build a life detection experiment based on MA that could be deployed to extraterrestrial locations, and used as a complexity scale to quantify constraints needed to direct prebiotically plausible processes in the laboratory. Such an approach is vital for finding life elsewhere in the universe or creating de-novo life in the lab.

scholarly journals Detection of Quasi-Static Trapped Human Being Using Mono-Static UWB Life-Detection Radar

2021 ◽  
Vol 11 (7) ◽  
pp. 3129
Author(s):  
Kun Yan ◽  
Shiyou Wu ◽  
Guangyou Fang
Keyword(s):  
Economic Cost ◽  
Operating Mode ◽  
Ultra Wideband ◽  
Detection Methods ◽  
Human Being ◽  
Human Beings ◽  
Detection Ability ◽  
Radar Echo ◽  
Life Detection ◽  
Respiration Motion

In practical situations such as hostage rescue, earthquake and other similar events, the ultra-wideband (UWB) life-detection radar echo response from the respiration motion of the trapped person is always quasi-/non-periodic in respiration frequency or very weak in respiration amplitude, which can be called quasi-static vital sign. Although it is an extremely difficult task, considering the economic cost, the detection ability of the traditional UWB life-detection radars with only a pair of transceiver antennas is desired to be enhanced for locating the quasi-static trapped human being. This article proposes two different detection methods for quasi-static trapped human beings through the single/multiple observation points, which corresponds to the single-/multi-station radar operating mode, respectively. Proof-of-principle experiments were carried out by our designed radar prototypes, validating the effectiveness of the proposed methods.

The Biological Oxidant and Life Detection (BOLD) mission: A proposal for a mission to Mars

2012 ◽  
Vol 67 (1) ◽  
pp. 57-69 ◽  
Author(s):  
Dirk Schulze-Makuch ◽  
James N. Head ◽  
Joop M. Houtkooper ◽  
Michael Knoblauch ◽  
Roberto Furfaro ◽  
...  
Keyword(s):  
Life Detection

scholarly journals Astrobiological Field Campaign to a Volcanosedimentary Mars Analogue Methane Producing Subsurface Protected Ecosystem: Imuruk Lake (Alaska)

2011 ◽  
Vol 2011 ◽  
pp. 1-8
Author(s):  
F. Gómez ◽  
O. Prieto-Ballesteros ◽  
D. Fernández-Remolar ◽  
J. A. Rodríguez-Manfredi ◽  
M. Fernández-Sampedro ◽  
...  
Keyword(s):  
Molecular Ecology ◽  
Point Of View ◽  
Land Bridge ◽  
High Hydrogen ◽  
Adverse Conditions ◽  
Life On Mars ◽  
Life Detection ◽  
National Preserve ◽  
Mars Exploration Rovers

Viking missions reported adverse conditions for life in Mars surface. High hydrogen signal obtained by Mars orbiters has increased the interest in subsurface prospection as putative protected Mars environment with life potential. Permafrost has attracted considerable interest from an astrobiological point of view due to the recently reported results from the Mars exploration rovers. Considerable studies have been developed on extreme ecosystems and permafrost in particular, to evaluate the possibility of life on Mars and to test specific automated life detection instruments for space missions. The biodiversity of permafrost located on the Bering Land Bridge National Preserve has been studied as an example of subsurface protected niche of astrobiological interest. Different conventional (enrichment and isolation) and molecular ecology techniques (cloning, fluorescence“in situ”probe hybridization, FISH) have been used for isolation and bacterial identification.

Practical life log video indexing based on content and context

2006 ◽  
Author(s):  
Datchakorn Tancharoen ◽  
Toshihiko Yamasaki ◽  
Kiyoharu Aizawa
Keyword(s):  
Video Indexing ◽  
Practical Life

scholarly journals MATHEMATICAL MODEL OF THREE SPECIES FOOD CHAIN INTERACTION WITH MIXED FUNCTIONAL RESPONSE

2012 ◽  
Vol 09 ◽  
pp. 334-340 ◽  
Author(s):  
MADA SANJAYA WS ◽  
ISMAIL BIN MOHD ◽  
MUSTAFA MAMAT ◽  
ZABIDIN SALLEH
Keyword(s):  
Mathematical Model ◽  
Functional Response ◽  
Food Chain ◽  
Equilibrium Points ◽  
Dynamical Behavior ◽  
Bifurcation Points ◽  
Dynamical Behaviors ◽  
Practical Life ◽  
Parameter Values ◽  
Chain Interaction

In this paper, we study mathematical model of ecology with a tritrophic food chain composed of a classical Lotka-Volterra functional response for prey and predator, and a Holling type-III functional response for predator and super predator. There are two equilibrium points of the system. In the parameter space, there are passages from instability to stability, which are called Hopf bifurcation points. For the first equilibrium point, it is possible to find bifurcation points analytically and to prove that the system has periodic solutions around these points. Furthermore the dynamical behaviors of this model are investigated. Models for biologically reasonable parameter values, exhibits stable, unstable periodic and limit cycles. The dynamical behavior is found to be very sensitive to parameter values as well as the parameters of the practical life. Computer simulations are carried out to explain the analytical findings.

Alternating chiral selectivity of aldol reactions under the confined space of mesoporous silica

2015 ◽  
Vol 51 (96) ◽  
pp. 17116-17119 ◽  
Author(s):  
Chewei Yeh ◽  
Yan-Ru Sun ◽  
Shing-Jong Huang ◽  
Yeun-Min Tsai ◽  
Soofin Cheng
Keyword(s):  
Mesoporous Silica ◽  
Aldol Reaction ◽  
Recyclable Catalyst ◽  
Aldol Reactions ◽  
Water Medium ◽  
Confined Space ◽  
Asymmetric Aldol ◽  
Co Catalysts ◽  
Asymmetric Aldol Reaction ◽  
Chiral Selectivity

The chiral selectivities were altered and high diastereo- and enantio-selectivities of the products were obtained in water medium without adding acid co-catalysts when a primary–tertiary diamine catalyst was immobilized on mesoporous SBA-15 to form a recyclable catalyst for the direct asymmetric aldol reaction of cyclohexanone with p-nitrobenzaldehyde.

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