Calophyllum brasiliense (Cambes) produces calanolide secondary metabolites that are active against human immunodeficiency virus type 1 reverse transcriptase. In this study, it was demonstrated that ...plant tissue culture is a useful technique for producing these metabolites. Different concentrations and combinations of plant growth regulators were tested in leaf and seed explants to establish callus cultures capable of producing calanolides. Highest callus induction (100%) was achieved when seed explants were incubated in a medium consisting of 8.88 μM 6-benzyladenine and 20 μM picloram. Highest callus induction (80.67%) was observed when leaf explants were incubated on a medium consisting of 0.46 μM kinetin and 5.37 μM α-naphthaleneacetic acid. High-performance liquid chromatography quantitative analysis revealed higher calanolide B and calanolide C production in calluses from seed explants than those developed from leaves (309.25 vs. 8.70 mg kg⁻¹ for calanolide B; 117.70 vs. 0.0 mg kg⁻¹ for calanolide C).
Resumen La acondroplasia es una enfermedad genética rara que representa la forma más común de enanismo de extremidades cortas. Existen pocos casos reportados de gigantomastia y subsecuente cirugía ...mamaria en esta población. Presentamos el caso de una paciente con acondroplasia, gigantomastia y medialización de pezón que requirió mamoplastia reductora y reposición de complejo areola pezón (CAP). Se utilizó la técnica de T invertida con pedículo inferior. La planeación quirúrgica y el correcto marcaje en pacientes acondroplásicos son pasos importantes para una cirugía exitosa teniendo en cuenta que las referencias anatómicas habituales no son guías confiables para un posicionamiento ideal de la mama en el tórax o del CAP en la mama.
This paper describes the operation of the Coherent CAPTAIN-Mills (CCM) detector located at the Los Alamos Neutron Science Center at Los Alamos National Laboratory. CCM is a 10-ton liquid argon ...detector located 20 meters from a high flux neutron/neutrino source and is designed to search for sterile neutrinos (νs’s) and light dark matter (LDM). An engineering run was performed in fall 2019 to study the characteristics of the CCM120 detector by searching for coherent scattering signals consistent with νs’s and LDM resulting from the production and decays of π+ and π0 in the tungsten target. New parameter space in a leptophobic dark matter (DM) model was excluded for DM masses between ~2.0 and 30 MeV. The lessons learned from this run have guided the development and construction of the new CCM200 detector that will begin operations in 2021 and significantly improve on these searches.
This paper focuses on the evaluation of the biomass production of a novel native microalgal strain
Chlorella sorokiniana
using centrate from municipal wastewater as the sole source of nutrients and ...six different temperatures. The experiments were performed in semi-continuous cultures using Bold’s Basal Medium and centrate separately, modifying the temperature (25–50 °C). The study aimed to elucidate whether a thermotolerant strain can be used for both the production of biomass and the removal of nutrients from wastewater. It was observed that
C. sorokiniana
biomass can be produced using centrate as the sole nutrient source. The highest biomass yield, for both culture media, was achieved at 35 °C showing maximum values for centrate (1.0 g
biomass
·L
−1
, 0.20 g
biomass
·L
−1
·day
−1
dry weight), surpassing the productivity obtained when using Bold’s Basal Medium (BBM) (0.60 g
biomass
·L
−1
; 0.13 g
biomass
·L
−1
·day
−1
dry weight). Variable chlorophyll fluorescence confirmed that the excess of ammonium (601 mg
NH4
·L
−1
) did not inhibit the growth of
C. sorokiniana
, and thus, the biomass productivity was not affected. The maximum nutrient removals reached for BBM and centrate were 96% and 61.5% for nitrogen, 53.2% and 61% for phosphorus, and 93% and 0.18% for total carbon, respectively. Fatty acids accumulating in the microalgal biomass were mainly composed of arachidonic, oleic, and eicosatetraenoic acids. Consequently, it is demonstrated that microalgae native to desertic areas can be used to produce microalgal biomass using centrate from wastewater treatment plants as the exclusive nutrient source, reaching high productivities.
We report the first results of a search for leptophobic dark matter (DM) from the Coherent–CAPTAIN-Mills (CCM) liquid argon (LAr) detector. An engineering run with 120 photomultiplier tubes (PMTs) ...and 17.9 × 1020 protons on target (POT) was performed in fall 2019 to study the characteristics of the CCM detector. The operation of this 10-ton detector was strictly light based with a threshold of 50 keV and used coherent elastic scattering off argon nuclei to detect DM. Despite only 1.5 months of accumulated luminosity, contaminated LAr, and nonoptimized shielding, CCM’s first engineering run has already achieved sensitivity to previously unexplored parameter space of light dark matter models with a baryonic vector portal. With an expected background of 115 005 events, we observe 115 005 + 16.5 events which is compatible with background expectations. For a benchmark mediator-to-DM mass ratio of mVB=mχ = 2.1, DM masses within the range 9 MeV ≲ mχ ≲ 50 MeV are excluded at 90% C. L. in the leptophobic model after applying the Feldman-Cousins test statistic. CCM’s upgraded run with 200 PMTs, filtered LAr, improved shielding, and 10 times more POT will be able to exclude the remaining thermal relic density parameter space of this model, as well as probe new parameter space of other leptophobic DM models.
We show results from the Coherent CAPTAIN Mills (CCM) 2019 engineering run which begin to constrain regions of parameter space for axionlike particles (ALPs) produced in electromagnetic particle ...showers in an 800 MeV proton beam dump, and further investigate the sensitivity of ongoing data-taking campaigns for the CCM200 upgraded detector. Based on beam-on background estimates from the engineering run, we make realistic extrapolations for background reduction based on expected shielding improvements, reduced beam width, and analysis-based techniques for background rejection. We obtain reach projections for two classes of signatures; ALPs coupled primarily to photons can be produced in the tungsten target via the Primakoff process, and then produce a gamma-ray signal in the liquid argon CCM detector either via inverse Primakoff scattering or decay to a photon pair. ALPs with significant electron couplings have several additional production mechanisms (Compton scattering, e+e— annihilation, ALP-bremsstrahlung) and detection modes (inverse Compton scattering, external e+e— pair conversion, and decay to e+e—). In some regions, the constraint is marginally better than both astrophysical and terrestrial constraints. With the beginning of a three year run, CCM will be more sensitive to this parameter space by up to an order of magnitude for both ALP-photon and ALP-electron couplings. The CCM experiment will also have sensitivity to well-motivated parameter space of QCD axion models. It is only a recent realization that accelerator-based large volume liquid argon detectors designed for low-energy coherent neutrino and dark matter scattering searches are also ideal for probing ALPs in the unexplored ~ MeV mass scale.
A solution to the MiniBooNE excess invoking rare three-body decays of the charged pions and kaons to new states in the MeV mass scale was recently proposed as a dark-sector explanation. This class of ...solution illuminates the fact that, while the charged pions were focused in the target-mode run, their decay products were isotropically suppressed in the beam-dump-mode run in which no excess was observed. This suggests a new physics solution correlated to the mesonic sector. We investigate an extended set of phenomenological models that can explain the MiniBooNE excess as a dark sector solution, utilizing long-lived particles that might be produced in the three-body decays of the charged mesons and the two-body anomalous decays of the neutral mesons. Over a broad set of interactions with the long-lived particles, we show that these scenarios can be compatible with constraints from LSND, KARMEN, and MicroBooNE, and evaluate the sensitivity of the ongoing and future data taken by the Coherent CAPTAIN Mills experiment to a potential discovery in this parameter space.
Published by the American Physical Society
2024
This paper describes the operation of the Coherent CAPTAIN-Mills (CCM) detector located at the Los Alamos Neutron Science Center at Los Alamos National Laboratory. CCM is a 10-ton liquid argon ...detector located 20 meters from a high flux neutron/neutrino source and is designed to search for sterile neutrinos (νs’s) and light dark matter (LDM). An engineering run was performed in fall 2019 to study the characteristics of the CCM120 detector by searching for coherent scattering signals consistent with νs’s and LDM resulting from the production and decays of π+ and π0 in the tungsten target. New parameter space in a leptophobic dark matter (DM) model was excluded for DM masses between ~2.0 and 30 MeV. The lessons learned from this run have guided the development and construction of the new CCM200 detector that will begin operations in 2021 and significantly improve on these searches.
Abstract Eumycetoma is caused by different fungi. Madurella mycetomatis, Madurella grisae, and Scedosporium apiospermum are the most common causative agents. This disease is more frequent on the ...lower extremities but can also be present in other areas. The diagnosis is made by direct microscopic examination and histologic study, which should show hyphae and vesicles characteristic of the fungi. Etiologic identification of the species of the fungus is sometimes difficult by culture and biopsy specimen; in these cases, molecular techniques can help to identify the infecting organism. Treatment has been with amphotericin B, which is now seldom used due to its side effects and limited success. The best therapeutic choice is surgical removal of the lesion, followed by medical treatment. This includes antifungals such as the azoles, ketoconazole and itraconazole; in resistant cases, posaconazole and voriconazole are currently recommended. In particular, the combination of terbinafine and itraconazole can elicit a good result in some cases.
The roots of the tropical tree
Lonchocarpus oaxacensis afforded the 3-hydroxyflavanones jayacanol and mundulinol, as well as two flavanones, mundulin and minimiflorin. Flavonoids bearing ...6,7-(dimethylpyran) and 8-(γγ-dimethyl allyl) substituents are characteristic for species grouped in the
Minimiflori subsection. Therefore this subsection seems to be chemically and morphologically homogeneous. The antifungal activity of the four isolated compounds was tested against the wood rotting fungus
Postia placenta, but only jayacanol was active.
