2,256 research outputs found
How to look for supersymmetry under the lamppost at the LHC
We apply a model-independent, agnostic approach to the collider phenomenology
of supersymmetry (SUSY), in which all mass parameters are taken as free inputs
at the weak scale. We consider the gauginos, higgsinos, and the first two
generations of sleptons and squarks, and analyze all possible mass hierarchies
among them ( in total) in which the lightest superpartner
is neutral, leading to missing energy. In each case, we identify the full set
of the dominant (i.e. least suppressed by phase space, small mixing angles or
Yukawa couplings) decay chains originating from the lightest colored
superpartner. Our exhaustive search reveals several quite dramatic yet
unexplored multilepton signatures with up to 8 isolated leptons (plus possibly
up to 2 massive gauge or Higgs bosons) in the final state. Such events are
spectacular, background-free for all practical purposes, and may lead to a
discovery of SUSY in the very early stage () of LHC
operations at 7 TeV.Comment: 4 pages, 4 figure
RNA-Seq analysis for indigo biosynthesis pathway genes in Indigofera tinctoria and Polygonum tinctorium
AbstractNatural indigo is the most important blue dye for textile dyeing and valuable secondary metabolite biosynthesized in Indigofera tinctoria and Polygonum tinctorium plants. Present investigation is made to generation of gene resource for pathway enrichment and to understand possible gene expression involved in indigo biosynthesis. The data about raw reads and the transcriptome assembly project has been deposited at GenBank under the accessions SRA180766 and SRX692542 for I. tinctoria and P. tinctorium, respectively
Characterizations of an ecotype of brake-fern, Pteris vittata, for arsenic tolerance and accumulation in plant biomass
An ecotype of brake fern (Pteris vittata) was assessed for arsenic tolerance and accumulation in its biomass under in vivo and in vitro condition; using soil, and agargelled Murashige and Skoog (MS) medium supplemented with different concentrations of arsenic. The plants were raised in soil amended with 100–1000 mg arsenic kg^–1 soil, and MS medium was supplemented with 10–300 mg arsenic L–1 medium using Na2HAsO4×7H2O. The spores and haploid gametophytic-prothalli were raised in vitro on MS medium supplemented with arsenic. The field plants showed normal growth and biomass formation in arsenic amended soil, and accumulated 1908– 4700 mg arsenic kg^–1 dry aerial biomass after 10 weeks of growth. Arsenic toxicity was observed above >200 mg arsenic kg^–1 soil. The concentrations of arsenic accumulated in the plant biomass were statistically significant (p < 0.05). Normal plants were developed from spores and gametophyte prothalli on the MS media supplemented with 50–200 mg arsenic L^–1 medium. The in vitro raised plants were tolerant to 300 mg arsenic kg^–1 of soil and accumulated up to 3232 mg arsenic kg^–1 dry aerial biomass that showed better growth performance, biomass generation and arsenic accumulation in comparison to the field plants.Екотип птериса стрічкового (Pteris vittаta) був досліджений на стійкість до миш’яку та його накопичення в біомасі в умовах in vivo і in vitro з використанням грунту та агаризованого середовища МурасігеСкуга (MS), що містять миш’як в різних концентраціях. Рослини вирощували на грунті, що містить 100–1000 мг миш’яку на 1 кг грунту, чи в грунті Мурасіге-Скуга, в котрий додавали 10–300 мг/л Na2HAsO4 ×7H2O. Спори та гаплоїдні гематофітні паростки росли in vitro на середовищі MS з миш’яком. Рослини, які ростуть на грунті, що містить миш’як, характеризувались нормальним ростом і накопиченням біомаси та через 10 тижнів вирощування накопичували 1908–4700 миш’яку на 1 кг сухої надземної біомаси. Токсичність миш’яку проявлялась при його концентрації в грунті більше 200 мг/кг. Концентрації миш’яку, котрі накопичувалися в рослинній біомасі, були статистично значимими (р < 0.5). Зі спор та гаметофітних паростків, котрі вирощували на грунті MS з 50–200 мг/л миш’яку, розвивались нормальні рослини. Отримані in vitro рослини були стійкими до миш’яку в концентрації 300 мг/кг грунту та накопичували миш’як до 3232 мг/кг сухої надземної біомаси, що означає покращання ростових характеристик, формування біомаси та накопичення миш’яку в порівнянні з рослинами, вирощеними на полі.Экотип птериса ленточного (Pteris vittаta) был исследован на устойчивость к мышьяку и его накопление в биомассе в условиях in vivo и in vitro с использованием почвы и агаризованной среды Мурасиге-Скуга (MS), содержащих мышьяк в разных концентрациях. Растения выращивали в почве, содержащей 100–1000 мг мышьяка на 1 кг почвы, или в среде Мурасиге-Скуга, в которую добавляли 10–300 мг/л Na2HAsO4 × 7H2O. Споры и гаплоидные гаметофитные проростки росли in vitro на среде MS с мышьяком. Растения, которые росли в почве, содержащей мышьяк, характеризовались нормальным ростом и накоплением биомассы и через 10 недель выращивания накапливали 1908–4700 мг мышьяка на 1 кг сухой надземной биомассы. Токсичность мышьяка проявлялась при его концентрации в почве свыше 200 мг/кг. Концентрации мышьяка, которые накапливались в растительной биомассе, были статистически значимыми (р < 0,5). Из спор и гаметофитных проростков, которые выращивали на среде MS с 50–200 мг/л мышьяка, развивались нормальные растения. Полученные in vitro растения были устойчивы к мышьяку в концентрации 300 мг/кг почвы и накапливали мышьяк до 3232 мг/кг сухой надземной биомассы, что означает улучшенные ростовые характеристики, формирование биомассы и накопление мышьяка по сравнению с растениями, выращенными в поле
A follow-up survey to assess stakeholders’ perspectives on weed management challenges and current practices in Nebraska, USA
Stakeholders across the state of Nebraska, USA, were surveyed in 2019–2020 to assess problem weeds and weed management practices in agronomic crops. A total of 420 complete responses were obtained across four Nebraska districts (Northeast, Panhandle, Southeast, and West Central). Accumulated across the state, 65.5% of farmed or scouted crop ground in Nebraska was under no-till production, with the major crops being corn and soybean representing 39.3% and 30.7% of agronomic crop production area, respectively. Palmer amaranth, horseweed, waterhemp, kochia, and giant ragweed were ranked the most problematic weeds. In a 2014–2015 survey, Palmer amaranth was the sixth most problematic weed. The most used preplant herbicides were 2,4-D, glyphosate, and dicamba in the 2019–2020 survey. Atrazine applied alone or in mixture with acetochlor, bicyclopyrone, clopyralid, mesotrione, or S-metolachlor were the most applied pre-emergence (PRE) herbicides in corn, whereas the most applied PRE herbicides in soybean were metribuzin/sulfentrazone, flumioxazin/pyroxasulfone, and chloransulam-methyl/sulfentrazone. Like the previous survey, glyphosate was the most frequent choice of survey respondents as a post-emergence (POST) herbicide in glyphosate-resistant corn and soybean, while 2,4-D was the most applied POST herbicide in grain sorghum and wheat. Most of the respondents (77%) were aware of the new multiple herbicide-resistant crops, and 86% listed physical drift and volatility of dicamba/2,4-D as a primary concern. Twenty-three percent of survey respondents identified integrated pest management as a primary research and extension priority for profitable agronomic crop production in Nebrask
A Wave-function for Stringy Universes
We define a wave-function for string theory cosmological backgrounds. We give
a prescription for computing its norm following an earlier analysis within
general relativity. Under Euclidean continuation, the cosmologies we discuss in
this paper are described in terms of compact parafermionic worldsheet systems.
To define the wave-function we provide a T-fold description of the
parafermionic conformal field theory, and of the corresponding string
cosmology. In specific examples, we compute the norm of the wave-function and
comment on its behavior as a function of moduli.Comment: 30 pages, 3 figures, v3: references adde
A radiation-like era before inflation
We show that the semiclassical approximation to the Wheeler-DeWitt equation
for the minisuperspace of a minimally coupled scalar field in the spatially
flat de Sitter Universe prompts the existence of an initial power-law evolution
driven by non-adiabatic terms from the gravitational wavefunction which act
like radiation. This simple model hence describes the onset of inflation from a
previous radiation-like expansion during which the cosmological constant is
already present but subleading.Comment: LaTeX, 8 pages, no figures; final version to be published in JCA
Can the clustered dark matter and the smooth dark energy arise from the same scalar field ?
Cosmological observations suggest the existence of two different kinds of
energy densities dominating at small ( Mpc) and large ( Mpc) scales. The dark matter component, which dominates at small scales,
contributes and has an equation of state while
the dark energy component, which dominates at large scales, contributes
and has an equation of state . It is
usual to postulate wimps for the first component and some form of scalar field
or cosmological constant for the second component. We explore the possibility
of a scalar field with a Lagrangian L =- V(\phi) \sqrt{1 - \del^i \phi \del_i
\phi} acting as {\it both} clustered dark matter and smoother dark energy and
having a scale dependent equation of state. This model predicts a relation
between the ratio of the energy densities of the
two dark components and expansion rate of the universe (with ) in the form . For , we get
which is consistent with observations.Comment: Revised to match the published version. Minor changes and a reference
adde
String production after angled brane inflation
We describe string production after angled brane inflation. First, we point
out that there was a discrepancy in previous discussions. The expected tension
of the cosmic string calculated from the four-dimensional effective Lagrangian
did not match the one obtained in the brane analysis. In the previous analysis,
the cosmic string is assumed to correspond to the lower-dimensional daughter
brane, which wraps the same compactified space as the original mother brane. In
this case, however, the tension of the daughter brane cannot depend on the
angle (\theta). On the other hand, from the analysis of the effective
Lagrangian for tachyon condensation, it is easy to see that the tension of the
cosmic string must be proportional to \theta, when \theta << 1. This is an
obvious discrepancy that must be explained by consideration of the explicit
brane dynamics. In this paper, we will solve this problem by introducing a
simple idea. We calculate the tension of the string in the two cases, which
matches precisely. The cosmological constraint for angled inflation is relaxed,
because the expected tension of the cosmic string becomes smaller than the one
obtained in previous arguments, by a factor of \theta.Comment: 13pages, 3 figures, typos correcte
Gene transfer in Indian major carps by electroporation
The rainbow trout growth hormone gene has been successfully tranferred into three species of Indian major carps rohu (Labeo rohita), mrigal (Cirrhinus mrigala) and catla (Catla catla) through electroporated sperm cell. At 0.5kV/cm (25μF capacitance, a resistance, and 2 pulses) the gene transfer efficiency was 25% for rohu, 23% for mrigal and 13% for catla. This is the first report on gene transfer in Indian major carps
A study on the proportion of hearing impairment among percussionists in Thrissur district of Kerala
Background: Hearing loss is a cause of global concern. Percussionists are exposed to greater levels of continuous or intermittent noise than others. Little is known about the relationship between percussion activity and hearing impairment. The early detection of the same and subsequent management makes a significant reduction in the burden of health care services. The objective was to study the proportion of hearing impairment in percussionists in the district of Thrissur using an IOS based mobile application.Methods: A cross sectional study was done on percussionists from Thrissur district who has experience of more than five years and has no congenital or traumatic hearing loss. A predesigned semi structured questionnaire was given and hearing tests were done using a mobile application U hear in a sound proof setting to understand the current state of hearing ability amoung the percussionists.Results: A total of 39 subjects were involved in our study of which all were males. Mean age of our study population was 30.44+12.04. most of them were diagnosed with at least mild degree of hearing loss of one of the ear or both the ears. 15.4% of them had mild degree of hearing loss, 64.1% had moderate degree of hearing loss and 20.5% had severe hearing loss.Conclusions: The study shows percussionists are more exposed to sounds of various frequencies for longer duration, they are more prone to hearing loss. The study brought out that age is directly proportional to hearing loss, music induced hearing loss progress at a rate proportion to the work experience.
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