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1.
Artículo en Inglés | MEDLINE | ID: mdl-38982696

RESUMEN

Lymphoma is a malignant tumor caused by abnormal proliferation of lymphocytes in the lymphatic system. Conventional treatments for lymphoma often have limitations, and new therapeutic strategies need to be explored. Realgar is an ancient Chinese medicine that has been used for centuries to treat a variety of ailments due to its therapeutic potential for various diseases, including cancer. However, it is a time-consuming waste and has a low absorption rate in the gastrointestinal tract, so it has the disadvantages of oral dose, potential toxicity, and low bioavailability. Recently, the development of nanotechnology has promoted the nanization of realgar particles, which have better physicochemical properties and higher bioavailability. The antitumor activity of Realgar nanoparticles against lymphoma has been demonstrated in preclinical studies. Realgar nanoparticles exhibit cytotoxic effects by inducing apoptosis and inhibiting the growth and proliferation of lymphoma cells. Moreover, these nanoparticles exert immunomodulatory effects by enhancing the activity of immune cells and promoting the cytotoxicity of T lymphocytes against lymphoma cells. Additionally, realgar nanoparticles have been shown to inhibit tumor angiogenesis, thereby restricting the blood supply and nutrient availability to lymphoma cells. Despite promising preclinical data, further research on the role and mechanism of realgar nanoparticles in the treatment of lymphoma remains to be studied. Moreover, the translation of these findings into clinical practice requires rigorous evaluation through well-designed clinical trials. Realgar nanoparticles hold great potential as a novel therapeutic approach for lymphoma, and their development may contribute to the advancement of precision medicine in the field of oncology.

2.
Sci Data ; 11(1): 271, 2024 Mar 05.
Artículo en Inglés | MEDLINE | ID: mdl-38443375

RESUMEN

In this Data Descriptor, we present county-level electricity outage estimates at 15-minute intervals from 2014 to 2022. By 2022 92% of customers in the 50 US States, Washington DC, and Puerto Rico are represented. These data have been produced by the Environment for Analysis of Geo-Located Energy Information (EAGLE-ITM), a geographic information system and data visualization platform created at Oak Ridge National Laboratory to map the population experiencing electricity outages every 15 minutes at the county level. Although these data do not cover every US customer, they represent the most comprehensive outage information ever compiled for the United States. The rate of coverage increases through time between 2014 and 2022. We present a quantitative Data Quality Index for these data for the years 2018-2022 to demonstrate temporal changes in customer coverage rates by FEMA region and indicators of data collection gaps or other errors.

3.
Sci Rep ; 13(1): 18515, 2023 Oct 28.
Artículo en Inglés | MEDLINE | ID: mdl-37898710

RESUMEN

Direct band gap GeSn alloys have recently emerged as promising lasing source materials for monolithic integration on Si substrate. In this work, optically pumped mid-infrared GeSn lasers were studied with the observation of dual-wavelength lasing at 2187 nm and 2460 nm. Two simultaneous lasing regions include a GeSn buffer layer (bulk) and a SiGeSn/GeSn multiple quantum well structure that were grown seamlessly using a chemical vapor deposition reactor. The onset of dual lasing occurs at 420 kW/cm2. The wider bandgap SiGeSn partitioning barrier enables the independent operation of two gain regions. While the better performance device in terms of lower threshold may be obtained by using two MQW regions design, the preliminary results and discussions in this work paves a way towards all-group-IV dual wavelength lasers monolithically integrated on Si substrate.

4.
Opt Lett ; 48(7): 1626-1629, 2023 Apr 01.
Artículo en Inglés | MEDLINE | ID: mdl-37221726

RESUMEN

The study of all-group-IV SiGeSn lasers has opened a new avenue to Si-based light sources. SiGeSn heterostructure and quantum well lasers have been successfully demonstrated in the past few years. It has been reported that, for multiple quantum well lasers, the optical confinement factor plays an important role in the net modal gain. In previous studies, adding a cap layer was proposed to increase the optical mode overlap with the active region and thereby improve the optical confinement factor of Fabry-Perot cavity lasers. In this work, SiGeSn/GeSn multiple quantum well (4-well) devices with various cap layer thicknesses, i.e., 0 (no cap), 190, 250, and 290 nm, are grown using a chemical vapor deposition reactor and characterized via optical pumping. While no-cap and thinner-cap devices only show spontaneous emission, the two thicker-cap devices exhibit lasing up to 77 K, with an emission peak at 2440 nm and a threshold of 214 kW/cm2 (250 nm cap device). The clear trend in device performance disclosed in this work provides guidance in device design for electrically injected SiGeSn quantum well lasers.

5.
Environ Monit Assess ; 195(5): 538, 2023 Apr 04.
Artículo en Inglés | MEDLINE | ID: mdl-37014445

RESUMEN

Changes in species diversity can be an indicator of ecosystem disturbance, impairment, or recovery. Estimating sampling effort needed to adequately represent stream fish assemblages is necessary for informing conservation actions. Increased sampling intensity can increase species detection, affecting the accuracy and precision of biodiversity indices. Seining is commonly used in fish surveys in sand-bottomed streams of the western USA. Here, we sampled 20, 200-m long stream sites each with 40 consecutive seine hauls to determine how increased within-site effort affected measures of species diversity. An average of 10 seine hauls were required to collect 75% of species present at sites in 40 seine hauls, while 18 seine hauls were required to collect 100% of species observed at a site sampled with 40 hauls. Simpson's diversity index was highly variable when fewer than 7 seine hauls were performed at each site but stabilized when effort was > 15 seine hauls per site. Total dissimilarity and ß-diversity components were variable under low sampling effort and also stabilized when effort reached 15 seine hauls per site. However, sampling with more than 18-20 seine hauls per site yielded few additional species. In shallow, sand-bed streams, we suggest sampling with < 5 seine hauls per 200 m of stream can result in unreliable estimates of α-diversity and variation in ß-diversity. Increased effort of 15-20 seine hauls per 200 m of stream captured nearly all species present in 40 hauls per 200 m and stabilized species evenness and ß-diversity indices.


Asunto(s)
Ecosistema , Arena , Animales , Monitoreo del Ambiente , Biodiversidad , Ríos , Peces
6.
Biomed Res Int ; 2022: 2102795, 2022.
Artículo en Inglés | MEDLINE | ID: mdl-36033580

RESUMEN

Objective: To investigate the correlation between TERC gene and cell proliferation and migration of oral squamous cell carcinoma. Methods: By comparing the traditional surgical treatment with the minimally invasive treatment of digital technology, the influence of Shengxin analysis method on the proliferation and migration of oral squamous cell carcinoma cells was analyzed. Results: Digital technology minimally invasive treatment has a great impact on the operation and survival rate of patients. TERC has a significant impact on the proliferation and migration of oral squamous cell carcinoma cells. Digital technology minimally invasive treatment can prevent TERC from great changes. Conclusion: TERC under the minimally invasive treatment of digital technology has little effect on the proliferation and migration of oral squamous cell carcinoma cells. It can promote the proliferation of oral squamous cell carcinoma cells. The inhibitors of migration and invasion can play an effective role in antiproliferation.


Asunto(s)
Carcinoma de Células Escamosas , Neoplasias de Cabeza y Cuello , Neoplasias de la Boca , Línea Celular Tumoral , Movimiento Celular , Proliferación Celular , Humanos , ARN , Carcinoma de Células Escamosas de Cabeza y Cuello , Telomerasa
7.
Appl Geogr ; 146: 102759, 2022 Sep.
Artículo en Inglés | MEDLINE | ID: mdl-35945952

RESUMEN

In the opening months of the pandemic, the need for situational awareness was urgent. Forecasting models such as the Susceptible-Infectious-Recovered (SIR) model were hampered by limited testing data and key information on mobility, contact tracing, and local policy variations would not be consistently available for months. New case counts from sources like John Hopkins University and the NY Times were systematically reliable. Using these data, we developed the novel COVID County Situational Awareness Tool (CCSAT) for reliable monitoring and decision support. In CCSAT, we developed a retrospective seven-day moving window semantic map of county-level disease magnitude and acceleration that smoothed noisy daily variations. We also developed a novel Bayesian model that reliably forecasted county-level magnitude and acceleration for the upcoming week based on population and new case count data. Together these formed a robust operational update including county-level maps of new case rate changes, estimates of new cases in the upcoming week, and measures of model reliability. We found CCSAT provided stable, reliable estimates across the seven-day time window, with the greatest errors occurring in cases of anomalous, single day spikes. In this paper, we provide CCSAT details and apply it to a single week in June 2020.

8.
Materials (Basel) ; 14(24)2021 Dec 11.
Artículo en Inglés | MEDLINE | ID: mdl-34947234

RESUMEN

Group-IV alloy GeSn holds great promise for the high-performance optoelectronic devices that can be monolithically integrated on Si for near- and mid-infrared applications. Growth of GeSn using chemical vapor deposition technique with various Sn and Ge precursors has been investigated worldwide. To achieve relatively high Sn incorporation, the use of higher pressure and/or higher order Ge hydrides precursors were reported. In this work, we successfully demonstrated the growth of high-quality GeSn with Sn composition of 16.7% at low pressure of 12 Torr. The alloy was grown using the commercially available GeH4 and SnCl4 precursors via a chemical vapor deposition reactor. Material and optical characterizations were performed to confirm the Sn incorporation and to study the optical properties. The demonstrated growth results reveal a low-pressure growth window to achieve high-quality and high Sn alloys for future device applications.

9.
Fisheries (Bethesda) ; 46(10): 505-511, 2021 Oct.
Artículo en Inglés | MEDLINE | ID: mdl-34518724

RESUMEN

COVID-19 has affected almost every aspect of society including freshwater fisheries fieldwork. Our study quantified the effects of the pandemic on fisheries fieldwork in the United States. We administered a survey to fisheries chiefs in all 50 states to assess the pandemic's impact on fisheries fieldwork. Of the 37 participants, 91% reported the pandemic affected their fieldwork and 92% adapted their sampling methods in response to the pandemic. Common adaptation strategies included using personal protective equipment (100%), practicing social distancing (97%), using smaller crews (82%), and developing contingency plans (51%). Based on the survey results, we identified potential challenges to adaptations and offered strategies to improve them. Strategies we identified include adopting novel data collection techniques, finding new positions for temporary employees, and publicly sharing contingency plans. Ultimately, this paper offers novel guidance on how fisheries professionals can best move forward with fieldwork during a time of crisis.

10.
Insects ; 12(8)2021 Jul 22.
Artículo en Inglés | MEDLINE | ID: mdl-34442233

RESUMEN

Drosophila suzukii, an economically important pest of small and thin-skinned fruits, has caused annual crop losses up to 20% in the state of Georgia's multimillion-dollar blueberry industry. The known host range of D. suzukii is large, yet the breadth of uncultivated and wild plants that can serve as alternative hosts in the southeastern United States is still not fully understood. Establishing comprehensive lists of non-crop D. suzukii hosts in woodlands near blueberry production will assist in the creation of more sustainable integrated pest management (IPM) strategies. Objectives of this study were to determine viability of wild fruiting plant species to this pest based on survivorship to adulthood and assess D. suzukii short-range preference between cultivated blueberries and wild fruit. Laboratory choice and no-choice assays were performed to determine if D. suzukii could complete its development on wild fruits sampled from the field. Results from our no-choice assays indicated that multiple species of wild fruits surveyed in Georgia were viable D. suzukii hosts including blackberry species, deerberry, hillside blueberry, common pokeweed, beautyberry, elderberry, evergreen blueberry, and large gallberry. Yet, none of these hosts were preferred by adult female D. suzukii as ovipositional substrates when compared to cultivated blueberries. However, these uncultivated species have the potential to sustain D. suzukii populations pre- and post-harvest season. This information can help farmers do more targeted management of these viable alternative hosts from wooded areas surrounding blueberry fields in order to minimize D. suzukii populations.

12.
Curr Opin Psychol ; 28: 192-197, 2019 08.
Artículo en Inglés | MEDLINE | ID: mdl-30776682

RESUMEN

Consciousness, defined here as the quality of awareness of self and the corresponding sensory environment, is considered to be one of most enigmatic and contentious areas of scholarly dissection and investigation. The subjective experience of pain is constructed and modulated by a myriad of sensory, cognitive and affective dimensions. Thus, the study of pain can provide many inroads to a concept like consciousness that the traditional sense modalities do not. Mindfulness defined here as non-reactive awareness of the present moment, can uniquely control and/or modulate particular substrates of conscious experience. Thus, in combination with brain imaging methodologies, we propose that the interactions between pain and mindfulness could serve as a more comprehensive platform to disentangle the biological and psychological substrates of conscious experience. The present review provides a brief synopsis on how combining the study of pain and mindfulness can inform the study of consciousness, delineates the multiple, unique brain mechanisms supporting mindfulness-based pain relief, and describes how mindfulness uniquely improves the affective dimension of pain, an important consideration for the treatment of chronic pain.


Asunto(s)
Encéfalo/fisiología , Estado de Conciencia/fisiología , Atención Plena , Dolor/fisiopatología , Encéfalo/fisiopatología , Humanos
13.
Psychoneuroendocrinology ; 105: 138-146, 2019 07.
Artículo en Inglés | MEDLINE | ID: mdl-30594324

RESUMEN

Psychosocial stress is a ubiquitous phenomenon in our society. While acute stress responses are necessary and adaptive, excessive activation of neurobiological stress systems can predispose an individual to far-reaching adverse health outcomes. Living in a complex social environment, experiencing stress is not limited to challenges humans face individually. Possibly linked with our capacity for empathy, we also display the tendency to physiologically resonate with others' stress responses. This recently identified source of stress raises many interesting questions. In comparison to the wealth of studies that have advanced our understanding of sharing others' affective states, the physiological resonance of stress has only recently begun to be more closely investigated. The aim of the current paper is to review the existing literature surrounding the emerging area of "stress contagion", "empathic stress" or "stress resonance", as it has been variably called. After a brief introduction of the concepts of stress and empathy, we discuss several key studies that paved the way for the merging of empathy with the concept of physiological resonance. We then delineate recent empirical studies specifically focusing on the physiological resonance of stress. In the final section of this review, we highlight differences between these studies and discuss the variability in terminology used for what seems to be the same phenomenon. Lastly, potential health implications of chronic empathic stress are presented and possible mechanisms of physiological stress transmission are discussed.


Asunto(s)
Empatía/fisiología , Hidrocortisona/metabolismo , Sistema Hipotálamo-Hipofisario , Percepción Social , Estrés Psicológico , Sistema Nervioso Simpático , Humanos , Sistema Hipotálamo-Hipofisario/metabolismo , Sistema Hipotálamo-Hipofisario/fisiopatología , Estrés Psicológico/metabolismo , Estrés Psicológico/fisiopatología , Sistema Nervioso Simpático/metabolismo , Sistema Nervioso Simpático/fisiopatología
14.
Environ Entomol ; 47(4): 935-945, 2018 08 11.
Artículo en Inglés | MEDLINE | ID: mdl-29668869

RESUMEN

Spotted-wing drosophila, Drosophila suzukii Matsumura (Diptera: Drosophilidae), is an invasive pest of soft-skinned fruits across the globe. Effective monitoring is necessary to manage this pest, but suitable attractants are still being identified. In this study, we combined lures with fermenting liquid baits to improve D. suzukii trapping specificity and attractiveness. We also measured the efficiency and specificity of baits/lures during different times of the season; the reproductive status of females among baits/lures; and the effects of locations and crop type on these response variables. We developed a metric that combined mating status and fat content to determine differences in types of females attracted. Lures utilizing yeast and sugar-based volatiles trapped the most D. suzukii. The addition of a commercial lure to yeast and sugar-based lures increased catches in most locations, but was also the least specific to D. suzukii. Apple juice-based chemical lures tended to be most specific to D. suzukii, while lures comprised of a singular attractant tended to trap more D. suzukii with a higher reproductive potential than combinations of attractants. Trap catch and lure specificity was lower during fruit development than fruit ripening. While catch amounts varied by geographic location and crop type, attractants performed similarly relative to each other in each location and crop. Based on the metrics in this study, the yeast and sugar-based attractants were the most effective lures. However, further work is needed to improve early season monitoring, elucidate the effects of physiological status on bait attraction, and understand how abiotic factors influence bait attraction.


Asunto(s)
Arándanos Azules (Planta)/crecimiento & desarrollo , Quimiotaxis , Drosophila/fisiología , Control de Insectos/métodos , Feromonas/farmacología , Rubus/crecimiento & desarrollo , Animales , Femenino , Frutas/crecimiento & desarrollo , Geografía , Masculino , Estados Unidos
15.
Clin Schizophr Relat Psychoses ; 12(2): 57-68, 2018.
Artículo en Inglés | MEDLINE | ID: mdl-26218234

RESUMEN

INTRODUCTION: The Gyrification Index (GI) represents the degree of cortical folding and is of special interest in schizophrenia, since alterations in cortical folding indirectly reflect white matter development and axonal connectivity underneath. To the best of our knowledge, very few studies have investigated the effect of sex on GI in schizophrenia. Differences in the GI between patients with schizophrenia and healthy controls and the relation between sex, age symptoms and duration of illness with GI were investigated. METHODS: T1-images were acquired from schizophrenia patients (24 males [SZ-M] and 24 females [SZ-F]) and healthy volunteers (24 males [NC-M] and 24 females [NC-F]) matched for age, sex and handedness. GI analyses were performed using the fully automated CIVET pipeline. RESULTS: Significantly lower GI was found in patients relative to controls bilaterally in frontal, temporal, and parietal cortex. Sex differences were found: negative correlation was found between the duration of illness and the right parietal GI and right occipital GI in SZ-M, while SZ-F was found in the left frontal and bilateral temporal GI. Patients, regardless of sex, showed positive correlations between negative symptoms and GI in the right occipital. NC-F had greater GI values than SZ-F and both male groups. CONCLUSIONS: Since GI reflects, in part, alterations in cerebral development and connectivity, the decrease in GI observed in patients is in agreement with the neurodevelopmental model of disconnectivity in schizophrenia; in addition, we emphasize the importance of sex differences in schizophrenia.


Asunto(s)
Corteza Cerebral/diagnóstico por imagen , Interpretación de Imagen Asistida por Computador , Imagen por Resonancia Magnética , Esquizofrenia/diagnóstico por imagen , Esquizofrenia/genética , Psicología del Esquizofrénico , Adulto , Factores de Edad , Proteínas de Caenorhabditis elegans , Dominancia Cerebral/fisiología , Femenino , Humanos , Masculino , Persona de Mediana Edad , Receptores de Superficie Celular , Valores de Referencia , Factores Sexuales , Adulto Joven
16.
Biotechnol Biofuels ; 10: 230, 2017.
Artículo en Inglés | MEDLINE | ID: mdl-29213306

RESUMEN

BACKGROUND: Genetically engineered biofuel crops, such as switchgrass (Panicum virgatum L.), that produce their own cell wall-digesting cellulase enzymes would reduce costs of cellulosic biofuel production. To date, non-bioenergy plant models have been used in nearly all studies assessing the synthesis and activity of plant-produced fungal and bacterial cellulases. One potential source for cellulolytic enzyme genes is herbivorous insects adapted to digest plant cell walls. Here we examine the potential of transgenic switchgrass-produced TcEG1 cellulase from Tribolium castaneum (red flour beetle). This enzyme, when overproduced in Escherichia coli and Saccharomyces cerevisiae, efficiently digests cellulose at optima of 50 °C and pH 12.0. RESULTS: TcEG1 that was produced in green transgenic switchgrass tissue had a range of endoglucanase activity of 0.16-0.05 units (µM glucose release/min/mg) at 50 °C and pH 12.0. TcEG1 activity from air-dried leaves was unchanged from that from green tissue, but when tissue was dried in a desiccant oven (46 °C), specific enzyme activity decreased by 60%. When transgenic biomass was "dropped-in" into an alkaline buffer (pH 12.0) and allowed to incubate at 50 °C, cellobiose release was increased up to 77% over non-transgenic biomass. Saccharification was increased in one transgenic event by 28%, which had a concurrent decrease in lignin content of 9%. Histological analysis revealed an increase in cell wall thickness with no change to cell area or perimeter. Transgenic plants produced more, albeit narrower, tillers with equivalent dry biomass as the control. CONCLUSIONS: This work describes the first study in which an insect cellulase has been produced in transgenic plants; in this case, the dedicated bioenergy crop switchgrass. Switchgrass overexpressing the TcEG1 gene appeared to be morphologically similar to its non-transgenic control and produced equivalent dry biomass. Therefore, we propose TcEG1 transgenics could be bred with other transgenic germplasm (e.g., low-lignin lines) to yield new switchgrass with synergistically reduced recalcitrance to biofuel production. In addition, transgenes for other cell wall degrading enzymes may be stacked with TcEG1 in switchgrass to yield complementary cell wall digestion features and complete auto-hydrolysis.

17.
Ophthalmic Surg Lasers Imaging Retina ; 48(6): 459-464, 2017 06 01.
Artículo en Inglés | MEDLINE | ID: mdl-28613351

RESUMEN

BACKGROUND AND OBJECTIVE: To compare the maximum basal diameter of choroidal tumors measured by clinical estimation and different imaging methods in intraocular tumors for therapeutic planning. PATIENTS AND METHODS: Retrospective, observational study reviewing the measurements of the longest basal diameter of choroidal tumors using the clinical estimation based on the indirect ophthalmoscopy, ophthalmic ultrasonography, 50° fundus imaging, ultra-wide-field imaging color composite, red laser, and green laser. RESULTS: The study included measurements of 74 tumors in 74 eyes. Correlation analysis between imaging measurements and clinical estimates led to following results: ultra-wide-field imaging measurements were 2.7% to 7.1% smaller than estimated clinical measurements by indirect ophthalmoscopy; followed by ultrasound, with 10.9% smaller measurements; and 50° fundus imaging, measuring 25.8% smaller than clinical estimates. When evaluating the precision of tumor measurements, ultrasound resulted in the highest precision, with a standard error of 1.6 mm compared to clinical estimates, followed by other imaging techniques with standard errors ranging from 2.4 mm to 3.0 mm. Determination of tumor margins with the ultrasound technique was better defined when subretinal fluid was present, or when the height of the tumor was greater than 3 mm. CONCLUSION: The authors' results suggest that measurements of the longest basal diameter of choroidal tumors can be accurately performed with ultrasound and ultra-wide-field color composite or red laser images. In the presence of subretinal fluid or tumor height above 3 mm, ultrasound can better delineate tumor margins. [Ophthalmic Surg Lasers Imaging Retina. 2017;48:459-464.].


Asunto(s)
Neoplasias de la Coroides/diagnóstico , Coroides/diagnóstico por imagen , Angiografía con Fluoresceína/métodos , Oftalmoscopía/métodos , Tomografía de Coherencia Óptica/métodos , Adulto , Anciano , Anciano de 80 o más Años , Femenino , Estudios de Seguimiento , Fondo de Ojo , Humanos , Masculino , Persona de Mediana Edad , Reproducibilidad de los Resultados , Estudios Retrospectivos , Adulto Joven
18.
BMC Biotechnol ; 17(1): 39, 2017 04 27.
Artículo en Inglés | MEDLINE | ID: mdl-28449656

RESUMEN

BACKGROUND: Panicum hallii Vasey (Hall's panicgrass) is a compact, perennial C4 grass in the family Poaceae, which has potential to enable bioenergy research for switchgrass (Panicum virgatum L.). Unlike P. hallii, switchgrass has a large genome, allopolyploidy, self-incompatibility, a long life cycle, and large stature-all suboptimal traits for rapid genetics research. Herein we improved tissue culture methodologies for two inbred P. hallii populations: FIL2 and HAL2, to enable further development of P. hallii as a model C4 plant. RESULTS: The optimal seed-derived callus induction medium was determined to be Murashige and Skoog (MS) medium supplemented with 40 mg L-1 L-cysteine, 300 mg L-1 L-proline, 3% sucrose, 1 g L-1 casein hydrolysate, 3 mg L-1 2,4-dichlorophenoxyacetic acid (2,4-D), and 45 µg L-1 6-benzylaminopurine (BAP), which resulted in callus induction of 51 ± 29% for FIL2 and 81 ± 19% for HAL2. The optimal inflorescence-derived callus induction was observed on MP medium (MS medium supplemented with 2 g L-1 L-proline, 3% maltose, 5 mg L-1 2,4-D, and 500 µg L-1 BAP), resulting in callus induction of 100 ± 0.0% for FIL2 and 84 ± 2.4% for HAL2. Shoot regeneration rates of 11.5 ± 0.8 shoots/gram for FIL2 and 11.3 ± 0.6 shoots/gram for HAL2 were achieved using seed-induced callus, whereas shoot regeneration rates of 26.2 ± 2.6 shoots/gram for FIL2 and 29.3 ± 3.6 shoots/gram for HAL2 were achieved from inflorescence-induced callus. Further, cell suspension cultures of P. hallii were established from seed-derived callus, providing faster generation of callus tissue compared with culture using solidified media (1.41-fold increase for FIL2 and 3.00-fold increase for HAL2). CONCLUSIONS: Aside from abbreviated tissue culture times from callus induction to plant regeneration for HAL2, we noted no apparent differences between FIL2 and HAL2 populations in tissue culture performance. For both populations, the cell suspension cultures outperformed tissue cultures on solidified media. Using the methods developed in this work, P. hallii callus was induced from seeds immediately after harvest in a shorter time and with higher frequencies than switchgrass. For clonal propagation, P. hallii callus was established from R1 inflorescences, similar to switchgrass, which further strengthens the potential of this plant as a C4 model for genetic studies. The rapid cycling (seed-to-seed time) and ease of culture, further demonstrate the potential utility of P. hallii as a C4 model plant.


Asunto(s)
Medios de Cultivo/química , Panicum/crecimiento & desarrollo , Técnicas de Cultivo de Tejidos/métodos , Medios de Cultivo/farmacología , Germinación/efectos de los fármacos , Inflorescencia/crecimiento & desarrollo , Modelos Biológicos , Células Vegetales/efectos de los fármacos , Células Vegetales/fisiología , Semillas/crecimiento & desarrollo
19.
Front Psychol ; 8: 2312, 2017.
Artículo en Inglés | MEDLINE | ID: mdl-29387030

RESUMEN

Objectives: When physical exercise is systematically coupled to music production, exercisers experience improvements in mood, reductions in perceived effort, and enhanced muscular efficiency. The physiology underlying these positive effects remains unknown. Here we approached the investigation of how such musical agency may stimulate the release of endogenous opioids indirectly with a pain threshold paradigm. Design: In a cross-over design we tested the opioid-hypothesis with an indirect measure, comparing the pain tolerance of 22 participants following exercise with or without musical agency. Method: Physical exercise was coupled to music by integrating weight-training machines with sensors that control music-synthesis in real time. Pain tolerance was measured as withdrawal time in a cold pressor test. Results: On average, participants tolerated cold pain for ~5 s longer following exercise sessions with musical agency. Musical agency explained 25% of the variance in cold pressor test withdrawal times after factoring out individual differences in general pain sensitivity. Conclusions: This result demonstrates a substantial pain reducing effect of musical agency in combination with physical exercise, probably due to stimulation of endogenous opioid mechanisms. This has implications for exercise endurance, both in sports and a multitude of rehabilitative therapies in which physical exercise is effective but painful.

20.
J Econ Entomol ; 109(3): 1261-1266, 2016 Feb 25.
Artículo en Inglés | MEDLINE | ID: mdl-26921227

RESUMEN

Spotted wing drosophila, Drosophila suzukii Matsumura (Diptera: Drosophilidae), is an economically important invasive pest of many soft- and thin-skinned fruits in the United States. This pest has recently threatened blueberry production, a multimillion dollar industry in the southeastern United States. Muscadine grapes are often planted in mixed-crop production systems with blueberries. Although D. suzukii can oviposit in intact soft-skinned grapes, it has yet to be investigated whether muscadine grapes, having thicker-skinned berries, can be a viable host. The goal of this study was to assess the potential of muscadine grapes as a viable host of D. suzukii. Choice and no-choice assays were conducted with two muscadine grape varieties to determine the effect of ripeness and wounding of berries on their susceptibility to D. suzukii infestation. Results from the ripeness assays indicate that D. suzukii was unable to complete development to adulthood in unripe muscadine grapes. D. suzukii was able to complete their development in ripe and overripe grapes, although their success rate was significantly lower than in ripe blueberries. In both choice and no-choice wounding assays, wounded grapes had significantly more oviposition and subsequent development to adulthood than intact grapes. Moreover, wounded muscadines were similar to intact blueberries in D. suzukii oviposition, pupation, and adult eclosion. These data suggest that ripe and overripe muscadine grapes, especially when split and wounded by other pests such as birds, can support D. suzukii development and possibly sustain their populations around berry orchards for a longer period of time after blueberry harvest.

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