15,463 research outputs found
Neopronematus Panou, Emmanouel & Kazmierski 2000
No full textGenus Neopronematus Panou, Emmanouel & Kaźmierski, 2000 Type species Pronematus rapidus Kuznetzov, 1972 Diagnosis of genus. Leg I without apotele and claws, femur IV not divided. Tarsi III and IV with five setae. Trochanters I–III each with one seta. Setae h 2 and ps 2 absent.Published as part of Ahmad-Hosseini, Mohammad, Khanjani, Mohammad & Karamian, Roya, 2017, A new species of Neopronematus and a re-description of Pronematus rykei Meyer & Rodrigues (Acari: Iolinidae) from Iran, pp. 493-508 in Zootaxa 4337 (4) on page 494, DOI: 10.11646/zootaxa.4337.4.2, http://zenodo.org/record/103423
Una interpretación de a-ka-na-jo ( a3-ka-na-jo)
No full textThe author studies the word a-ka-na-jo in the PY Cn 328 tablet and taking into account some factors she proposes αγναιος as the reading of this word.The author studies the word a-ka-na-jo in the PY Cn 328 tablet and taking into account some factors she proposes αγναιος as the reading of this word
Environmental influences over the last 16 ka on compound-specific δ13C variations of leaf wax n-alkanes in the Hani peat deposit from northeast China
No full textCompound-specific carbon isotope ratios (δ13C) of leaf wax n-alkanes (C21-C33 odd carbon numbered n-alkanes) were measured in the Hani peat sequence from northeast China. These data were compared with lipid biomarker compositions to assess changes in local vegetation and paleoclimate for the last 16 ka The δ13C values of n-alkanes range between -36.6 and -30.7‰, showing that the compounds originate from C3 plants. Much larger variations (∼5.4‰) in the n-alkane δ13C values than those of atmospheric CO2 during the last 16 ka (< 0.5‰) indicate that the isotopic values were affected by environmental factors in addition to the postglacial δ13C variations in the atmospheric reservoir. The stratigraphic records of δ13C reveal decoupled fluctuations among the individual n-alkanes, particularly between 15.5 to 11.4 ka. Synchronous excursions in the δ13C offsets among individual n-alkanes (Δδ13C) and lipid biomarker paleoplant proxies (Paq, and C23/C31 and C27/C31) from 14.9 to 13.2 ka and 12.7 to 11.6 ka suggest that vegetational changes are the most likely causes for the decoupled δ13C variations. Parallel fluctuations of the δ13C values of terrestrial higher plant-derived C29 and C31 n-alkanes and the n-alkane average chain-length (ACL) from 11 to 6 ka indicate that the δ13C variations responded to net evaporation changes. Negative shifts in the n-alkane δ13C values coinciding with the ACL decreases at 10.5-9.3 ka and 8.1 ka indicate the short-term onset and fluctuations of the summer monsoon strength in eastern China during the early Holocene
NRF2 and chemoprevention: signaling, epigenetics and role in intestinal carcinogensis
No full textPrevention is better than cure. The carcinogenesis could take as long as 20 to 30 years to develop from initiated cells to malignant tumor, therefore providing us various opportunities to prevent the appearance of tumors with the use of chemopreventive compounds in the early stage. Chemoprevention becomes an increasing important concept and has led to the intense research about the mechanisms of actions of various chemopreventive compounds. They can be generally classified into blocking agents and suppressing agents. The chemopreventive compounds usually prevent or slow progression of cancer by maintaining a low oxidative stress and inflammatory environment in cells. This is brought about by the activation of Nrf2, the key protein being investigated in our lab. In this dissertation, I will be discussing the use of compounds as suppressing agents and blocking agents, how compounds activates Nrf2 signaling, how novel Nrf2 interaction partner IQGAP1 mediates Nrf2-Keap1 signaling axis, how expression level of Nrf2 could be regulated epigenetically, apart from the well-known post-translational control by Keap1-Ubiquitinase-Protesome axis and finally how loss of Nrf2 could enhance intestinal tumorigenesis in Apc(min/+) mice.Ph.D.Includes bibliographical referencesIncludes vitaby Ka Lung Cheun
Nearby fibroblasts' response to multiple acupuncture needle revolutions on fibroblast populated collagen gels
No full textAcupuncture is an ancient Chinese healing practice, and an alternative therapy for alleviating pain and chronic disorders. For over twenty years, research is trying to understand the mechanisms that lead to its therapeutic effect. Our laboratory investigates the cellular and molecular events in the connective tissue that occur by acupuncture needling. An in vitro assay was developed to evaluate some of the potential contributors to acupuncture’s effects using a cellular collagen gel as a loose connective tissue mimic. It was hypothesized besides immediate changes to cells under mechanical loading from an acupuncture needle, there were chemical factors released to nearby cells in acupuncture. This thesis investigates whether mechanically stimulating collagen gels with fibroblasts at different revolutions would release chemical factors to nearby fibroblasts where flow cytometry was used to observe cell proliferation as an indicator. Results reveal mechanically stimulating cellular collagen gels at different revolutions does not cause any changes in cell proliferation to nearby cells. However, dead stained mechanically stimulated cellular collagen gels showed cell death occurs around the acupuncture needle. It is possible there were no effects in cell proliferation because when a cellular collagen gel was needle manipulated, some chemical factors were released into the nearby cells. Then as needle manipulation increased, more chemical factors were released, but restricted by the larger amount of cell death around the needle from the increasing rotation.M.S.Includes bibliographical referencesby Ka Po Ch
Duan wei xia mu xie lei de xin xing he nei DNA fen zi xi tong biao ji zhi jian ding
No full textLeung Ka Chun.Thesis M.Phil. Chinese University of Hong Kong 2013.Includes bibliographical references (leaves 100-110).Abstracts also in Chinese.Title from PDF title page (viewed on 21, September, 2016).Leung Ka Chun
San zhong chao jian dai teng hu dui gao wen de sheng li fan ying ji zhuan lu ti yan jiu
No full textWong, Ka Wing Karen.Thesis M.Phil. Chinese University of Hong Kong 2014.Includes bibliographical references (leaves 143-157).Abstracts also in Chinese.Title from PDF title page (viewed on 30, November, 2016).Wong, Ka Wing Karen
Climate Generator (Stochastic Climate Representation: 120 ka to present year)
No full textI present a computationally efficient stochastic climate model for large spatiotemporal
scales (example, for the context of glacial cycle modelling). In analogy with a Weather
Generator (WG), the model can be thought of as a Climate Generator (CG). The
CG produces a synthetic climatology conditioned on various inputs. Inputs for the
CG include the monthly mean sea surface temperature field from a simplified Energy
Balance Model (EBM), surface elevation, surface ice, carbon dioxide, methane, orbital
forcing, latitude and longitude. The CG outputs mean monthly surface temperature
and precipitation using Bayesian Artificial Neural Networks (BANN) for non-linear
regression. The CG is trained against the results of GCMs (FAMOUS and CCSM)
over the last deglacial (22 ka to present). For validation, CG predictions are compared
directly against the 120 ka to 22.05 ka interval of FAMOUS results that were not
used for CG training. The stochastic noise is added to each prediction by generating
the random normal distribution with mean from the ensemble networks for a single
guess and Standard deviation computed from 10th and 90th percentile of the BANN
predictive distribution for each time step. For the CG trained against FAMOUS, I
show the predictive errors (relative to FAMOUS) are comparable to the difference
between FAMOUS and the CCSM.Includes bibliographical references (pages 48-50)
Islamic Economics: A Survey of the Literature
No full textA central thesis of this paper is that social science is the study of human experience, and hence strongly conditioned by history. Modern Western political, economic and social structures have emerged as a consequence of the repudiation of religion, and are based on secular principles. Many of these are inimical to Islamic principles, and cannot be adapted to an Islamic society. Muslim societies achieved freedom from colonial rule in the first half of the twentieth century and sought to construct institutions in conformity with Islam. The development of Islamic economics is part of this process of transition away from Western colonial institutions. This paper focuses on the contrasts between Western economic theories and Islamic approaches to organization of economic affairs. Neoclassical theory is centered around the acquisitive instinct of humans, and makes competition the driving force of economic analysis. Islamic approaches foster cooperation and encourage generosity as the fundamental principle for handling economic affairs. Human beings have potential for good and evil, and are free to choose between the two; their behavior is not subject to mathematical laws postulated by neoclassical economic theory. The main message of Islam is that we must strive to achieve the potential for good both at the individual and at the social level. Behavior in the economic realm is also governed by this goal. Islamic law (Shari’ah) provides the framework for all activity within an Islamic society. In the economic domain, Islamic law regulates both methods by which money may be earned and also the ways it may be spent. Acquisition of wealth is permissible only in ways which are just to all parties concerned; exploitation, arbitrary taxation, and individual profit resulting in social harm is not permissible in Islamic law. This puts numerous restrictions on business practices utilized to make profits. For example, polluting the environment, or selling products which lead to moral corruption would not be permissible in Islamic law. Wealth which has been acquired becomes private property, which is both a trust and a test according to Islamic concepts. The “trust” aspect means that property must be used in ways beneficial to the individual and society. The “test” aspect means that those who have more than they need should take care of those who are in need. Ways in which acquired wealth can be spent is also subject to Islamic law. People are expected to strive to be self-sufficient and not ask from others. Thus striving to acquire wealth and spending it on personal and family needs is encouraged by Islamic law. Islam does not preach austerity and encourages a comfortable standard of living. At the same time, it strongly discourages spending on idle desires, luxuries, and ostentation. There is also a strong encouragement to spend what is beyond ones needs on social welfare. These fundamental principles for acquiring wealth, using property (acquired wealth), and spending it impact on all realms of economic activity. Since these are substantially different from Western ideas in all three areas, there are substantial contrasts between Western economic institutions and Islamic ones. The paper traces out these differences in many realms of economic activity. The primary objective of an Islamic state is to provide justice, and Islamic public finance is concerned with tracing the concrete implications of this abstraction in the economic realm. Western financial institutions have the acquisition and multiplication of wealth as their prime objective. Since acquisition of wealth can only be a means to an end, these institutions require modification in an Islamic society. Similarly, Islamic imperatives for social welfare require construction of certain uniquely Islamic types of institutions which do not have counterparts in the West. The paper discusses these issues in some detail.Islamic Economics, Neoclassical Economics
The application of S-band polarimetric radar measurements to Ka-band attenuation prediction
No full textIn September 1993, the National Aeronautics and Space Administration's Advanced Communications Technology Satellite (ACTS) was deployed into a geostationary orbit near 100° W longitude. The ACTS satellite employs two Ka-band beacons, one at 20.185 GHz and another at 27.505 GHz. Impairments due to rain attenuation and tropospheric scintillations will significantly affect new technologies for this spectrum. Heavy rain at Ka-band can easily produce 30 dB of attenuation along the propagation path. Propagation experiments being conducted in seven different climatic zones involve multiyear attenuation measurements along the satellite-earth slant path. Measurements in the B2 climatic zone are made with an ACTS propagation terminal located in northeast Colorado. In order to gain more understanding about the physical processes that are responsible for Ka-band attenuation, the Colorado State University CHILL S-band polarimetric radar is used to take radar measurements along the slant path. The Colorado Front Range experiences a variety of weather conditions throughout the year ranging from upslope rain conditions to winter storms. Four such events measured along the slant path are illustrated in this paper. They include two convective cases and two "bright-band" cases. The S-band polarimetric radar data is used to initialize radar-based attenuation-prediction models, which are applied to the four precipitation events described. The comparisons of predicted attenuation to measured attenuation are quite good. It was also found during the course of the experiment that water droplets standing on the antenna surface can cause appreciable attenuation at Ka-band frequencies. That finding needs to be recognized in future model development and statistical analysis
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