134 research outputs found
Effect of Cucumber mosaic virus (CMV) on the Content of Some Cucumber Genotypes of Nitrogen, Protein, Phenols, and Flavonoids
This study was carried out to secreen the response of ten cucumber genotypes (AH-38، HA-37،HA-2160 ،HA2114 ، HA-2122 ،HA-12 ،HA-16 ،HA-41 ،CU-O719 , and CU-2102) against Cucumber mosaic virus (CMV) and to know the effect of infection on some of the plant contents of nitrogen, protein, phenols, and flavonoids. This study was carried out in the laboratory of Plant Virology and plastic houses of the College of Agriculture, University of Kerbala. The results showed that all cucumber genotypes tested in this study are susceptibe to CMV with severity infection ranged from 15-100%. It was also proved that the viral infection had a clear effect on reducing the content of the plant of nitrogen and protein in the genotypes and the most affected genotype was HA-2122 that was a significantly different from the content of nitrogen and protein in the non-infected plants. CMV was also found to have an effect in increasing the plant content of phenols and flavonoids in all genotypes infected with the virus (CMV) and the most affected genotypes were HA-37 and HA-41 (2.51 and 2.42 mg g-1 dry weight, respectively) and significantly different from the content of the same non-infected genotypes that gave rates of 1.66, 1.78 and 1.71 mg g-1 dry weight, respectively
A clock network for geodesy and fundamental science
Leveraging the unrivaled performance of optical clocks in applications in
fundamental physics beyond the standard model, in geo-sciences, and in
astronomy requires comparing the frequency of distant optical clocks
truthfully. Meeting this requirement, we report on the first comparison and
agreement of fully independent optical clocks separated by 700 km being only
limited by the uncertainties of the clocks themselves. This is achieved by a
phase-coherent optical frequency transfer via a 1415 km long telecom fiber link
that enables substantially better precision than classical means of frequency
transfer. The fractional precision in comparing the optical clocks of three
parts in was reached after only 1000 s averaging time, which is
already 10 times better and more than four orders of magnitude faster than with
any other existing frequency transfer method. The capability of performing high
resolution international clock comparisons paves the way for a redefinition of
the unit of time and an all-optical dissemination of the SI-second.Comment: 14 pages, 3 figures, 1 tabl
Ultra-stable optical clock with two cold-atom ensembles
Atomic clocks based on optical transitions are the most stable, and therefore
precise, timekeepers available. These clocks operate by alternating intervals
of atomic interrogation with dead time required for quantum state preparation
and readout. This non-continuous interrogation of the atom system results in
the Dick effect, an aliasing of frequency noise of the laser interrogating the
atomic transition. Despite recent advances in optical clock stability achieved
by improving laser coherence, the Dick effect has continually limited optical
clock performance. Here we implement a robust solution to overcome this
limitation: a zero-dead-time optical clock based on the interleaved
interrogation of two cold-atom ensembles. This clock exhibits vanishingly small
Dick noise, thereby achieving an unprecedented fractional frequency instability
of for an averaging time in seconds.
We also consider alternate dual-atom-ensemble schemes to extend laser coherence
and reduce the standard quantum limit of clock stability, achieving a
spectroscopy line quality factor
Geodesy and metrology with a transportable optical clock
partially_open24openGrotti, Jacopo; Koller, Silvio; Vogt, Stefan; Häfner, Sebastian; Sterr, Uwe; Lisdat, Christian; Denker, Heiner; Voigt, Christian; Timmen, Ludger; Rolland, Antoine; Baynes, Fred N.; Margolis, Helen S.; Zampaolo, Michel; Thoumany, Pierre; Pizzocaro, Marco; Rauf, Benjamin; Bregolin, Filippo; Tampellini, Anna; Barbieri, Piero; Zucco, Massimo; Costanzo, Giovanni A.; Clivati, Cecilia; Levi, Filippo; Calonico, DavideGrotti, Jacopo; Koller, Silvio; Vogt, Stefan; Häfner, Sebastian; Sterr, Uwe; Lisdat, Christian; Denker, Heiner; Voigt, Christian; Timmen, Ludger; Rolland, Antoine; Baynes, Fred N.; Margolis, Helen S.; Zampaolo, Michel; Thoumany, Pierre; Pizzocaro, Marco; Rauf, Benjamin; Bregolin, Filippo; Tampellini, Anna; Barbieri, Piero; Zucco, Massimo; Costanzo, Giovanni A.; Clivati, Cecilia; Levi, Filippo; Calonico, David
Trends in HIV/AIDS morbidity and mortality in Eastern 3 Mediterranean countries, 1990–2015: findings from the Global 4 Burden of Disease 2015 study
Objectives We used the results of the Global Burden of Disease 2015 study to estimate trends of HIV/AIDS burden in Eastern Mediterranean Region (EMR) countries between 1990 and 2015.
Methods Tailored estimation methods were used to produce final estimates of mortality. Years of life lost (YLLs) were calculated by multiplying the mortality rate by population by age-specific life expectancy. Years lived with disability (YLDs) were computed as the prevalence of a sequela multiplied by its disability weight.
Results In 2015, the rate of HIV/AIDS deaths in the EMR was 1.8 (1.4–2.5) per 100,000 population, a 43% increase from 1990 (0.3; 0.2–0.8). Consequently, the rate of YLLs due to HIV/AIDS increased from 15.3 (7.6–36.2) per 100,000 in 1990 to 81.9 (65.3–114.4) in 2015. The rate of YLDs increased from 1.3 (0.6–3.1) in 1990 to 4.4 (2.7–6.6) in 2015.
Conclusions HIV/AIDS morbidity and mortality increased in the EMR since 1990. To reverse this trend and achieve epidemic control, EMR countries should strengthen HIV surveillance,and scale up HIV antiretroviral therapy and comprehensive prevention services
Global, regional, and national burden of colorectal cancer and its risk factors, 1990–2019: a systematic analysis for the Global Burden of Disease Study 2019
Funding: F Carvalho and E Fernandes acknowledge support from Fundação para a Ciência e a Tecnologia, I.P. (FCT), in the scope of the project UIDP/04378/2020 and UIDB/04378/2020 of the Research Unit on Applied Molecular Biosciences UCIBIO and the project LA/P/0140/2020 of the Associate Laboratory Institute for Health and Bioeconomy i4HB; FCT/MCTES through the project UIDB/50006/2020. J Conde acknowledges the European Research Council Starting Grant (ERC-StG-2019-848325). V M Costa acknowledges the grant SFRH/BHD/110001/2015, received by Portuguese national funds through Fundação para a Ciência e Tecnologia (FCT), IP, under the Norma Transitória DL57/2016/CP1334/CT0006.proofepub_ahead_of_prin
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