Your browser doesn't support javascript.
loading
Mostrar: 20 | 50 | 100
Resultados 1 - 20 de 193
Filtrar
Más filtros

Banco de datos
País/Región como asunto
Tipo del documento
Intervalo de año de publicación
1.
Plant Cell Environ ; 47(5): 1625-1639, 2024 May.
Artículo en Inglés | MEDLINE | ID: mdl-38282386

RESUMEN

The circadian clock plays multiple functions in the regulation of plant growth, development and response to various abiotic stress. Here, we showed that the core oscillator component late elongated hypocotyl (LHY) was involved in rice response to salt stress. The mutations of OsLHY gene led to reduced salt tolerance in rice. Transcriptomic analyses revealed that the OsLHY gene regulates the expression of genes related to ion homeostasis and the abscisic acid (ABA) signalling pathway, including genes encoded High-affinity K+ transporters (OsHKTs) and the stress-activated protein kinases (OsSAPKs). We demonstrated that OsLHY directly binds the promoters of OsHKT1;1, OsHKT1;4 and OsSAPK9 to regulate their expression. Moreover, the ossapk9 mutants exhibited salt tolerance under salt stress. Taken together, our findings revealed that OsLHY integrates ion homeostasis and the ABA pathway to regulate salt tolerance in rice, providing insights into our understanding of how the circadian clock controls rice response to salt stress.


Asunto(s)
Oryza , Tolerancia a la Sal , Tolerancia a la Sal/genética , Hipocótilo/metabolismo , Oryza/fisiología , Estrés Salino , Homeostasis , Estrés Fisiológico , Regulación de la Expresión Génica de las Plantas , Proteínas de Plantas/genética , Proteínas de Plantas/metabolismo , Ácido Abscísico/metabolismo
2.
Opt Express ; 32(8): 13384-13395, 2024 Apr 08.
Artículo en Inglés | MEDLINE | ID: mdl-38859310

RESUMEN

We introduce a unique dual-function detector with an asymmetric light illumination based on the black silicon co-hyperdoped with sulfur and nitrogen for light and gas detection, and the properties in NO2 gas sensing and photoelectric detection are studied under various light and gas environments, respectively. Enhanced performance of the device under certain light and gas conditions is observed. When illuminated at the optimal wavelength, the gas sensors' responsivity to NO2 can be enhanced by approximately 5 to 200 times over 730 nm illumination, respectively. The photodetectors' photoresponsivity increases 15 to 200 times in a 300 ppm NO2 gas environment compared to air. Such mutual enhancement achieved through the clever combination of light and gas implies a novel approach to improve the performance of the black silicon detectors in both gas sensing and photoelectric detection.

3.
BMC Urol ; 24(1): 121, 2024 Jun 11.
Artículo en Inglés | MEDLINE | ID: mdl-38862925

RESUMEN

PURPOSE: Various complications following hypospadias surgery present distinct manifestations when examined with ultrasound. Utilizing high-frequency ultrasound, clinicians can promptly identify these complications and initiate appropriate treatment. The aim of this study is to catalogue the ultrasonographic presentations of various postoperative complications following hypospadias surgery, thereby providing a reference for ultrasonographic diagnosis. METHODS: Ultrasonic images of post-hypospadias surgery from October 1, 2015, to June 30, 2023, recorded at the Plastic Surgery Hospital of the Chinese Academy of Medical Sciences, serve as the basis for this investigation. Drawing on patient clinical diagnoses, this study compiles and selects representative ultrasound images of diverse complications. RESULTS: The study encompassed a total of 121 subjects; 26 demonstrated urethral stricture on ultrasonic images, two presented local urethral dilation, six showed intraurethral hair-like structures, 17 revealed intraurethral septum, two exhibited intraurethral fold, one had urethral calculus, one displayed urethral calcification, 12 indicated intraurethral urine accumulation, and two showed urethral diverticulum. CONCLUSION: Ultrasound examination is helpful for postoperative diagnosis following hypospadias, detecting complications such as urethral stricture, urethral hair growth, and urethral diverticulum, which can help doctors choose appropriate clinical treatment strategies.


Asunto(s)
Hipospadias , Complicaciones Posoperatorias , Ultrasonografía , Humanos , Hipospadias/cirugía , Masculino , Complicaciones Posoperatorias/diagnóstico por imagen , Complicaciones Posoperatorias/etiología , Preescolar , Lactante , Niño , Estrechez Uretral/etiología , Estrechez Uretral/diagnóstico por imagen , Adolescente , Enfermedades Uretrales/etiología , Enfermedades Uretrales/diagnóstico por imagen , Estudios Retrospectivos
4.
Risk Anal ; 2024 May 31.
Artículo en Inglés | MEDLINE | ID: mdl-38818965

RESUMEN

In today's highly competitive business environment, firms strive to maximize profitability by minimizing or eliminating disruptions and failures to maintain a competitive edge. This study focuses on evaluating risks in a hydraulic pump factory as a means to achieve sustainable growth. To accomplish this, a team of experts was formed to identify potential errors, utilizing a combination of risk priority number criteria weighted by Fuzzy Shannon's entropy and a fusion of multi-criteria decision-making and failure mode and effects analysis for evaluating and ranking failures. Moreover, the study emphasizes the importance of considering the interaction among risk assessment indicators, the inclusion of cost of failure, and modeling under fuzzy uncertainty circumstances, as they have a notable impact on the final ranking of failures to be processed for risk mitigation action planning. This research brings a new dimension to enhance the overall effectiveness of risk assessment by aggregation, as evidenced by a novel use of data classification in machine learning and correlation in statistics. The findings indicate that the aggregated ranking data series is best matched and most influenced by the weighted aggregated sum product assessment method, with the highest rate of recall and precision accomplished.

5.
J Craniofac Surg ; 35(4): e351-e354, 2024 Jun 01.
Artículo en Inglés | MEDLINE | ID: mdl-38829149

RESUMEN

Malignant hyperthermia (MH) is a fatal hyperthermia with a high mortality, which usually occurs during induction of general anesthesia. Dantrolene sodium is a wonder drug currently used for treating malignant hyperthermia. However, preparing, storing, and maintaining dantrolene sodium are crucially expensive, thus making it financially unsatisfactory and difficult for clinicians to acquire in time. Monitoring patients' condition closely and intervening promptly when early signs of malignant hyperthermia occur can effectively prevent the condition from worsening and win over time for the arrival of dantraline sodium. This article is to report a case in which we successfully rescued a child occurring malignant hyperthermia without using dantrolene sodium.


Asunto(s)
Anestesia General , Dantroleno , Hipertermia Maligna , Relajantes Musculares Centrales , Humanos , Dantroleno/uso terapéutico , Relajantes Musculares Centrales/uso terapéutico , Masculino , Femenino , Preescolar
6.
J Craniofac Surg ; 35(4): e333-e336, 2024 Jun 01.
Artículo en Inglés | MEDLINE | ID: mdl-38534171

RESUMEN

OBJECTIVE: To evaluate whether early systematic nursing can reduce the occurrence of postoperative nonstructural scoliosis in patients undergoing ear reconstruction. METHODS: A total of 136 patients with congenital microtia who underwent ear reconstruction surgery at the Department of Plastic Surgery, Chinese Academy of Medical Sciences from, January 2022 to July 2022 were included as study subjects. They were randomly divided into a routine nursing group and a systematic nursing group. After preoperative and postoperative education, as well as continuous follow-up intervention after surgery, spinal CT three-dimensional imaging examination was performed 6 months later to measure the Cobb angle and observe the occurrence of spinal scoliosis. RESULTS: Compared with the routine nursing group, the incidence and severity of postoperative nonstructural scoliosis were significantly reduced in patients who received systematic nursing. CONCLUSIONS: Systematic nursing intervention for patients undergoing ear reconstruction can help prevent the occurrence of postoperative nonstructural scoliosis and has a positive effect on improving patient prognosis. It is worth promoting in clinical treatment.


Asunto(s)
Microtia Congénita , Procedimientos de Cirugía Plástica , Complicaciones Posoperatorias , Escoliosis , Humanos , Escoliosis/cirugía , Femenino , Masculino , Complicaciones Posoperatorias/prevención & control , Procedimientos de Cirugía Plástica/métodos , Microtia Congénita/cirugía , Adolescente , Niño , Adulto , Adulto Joven , Incidencia
7.
J Craniofac Surg ; 35(4): e408-e411, 2024 Jun 01.
Artículo en Inglés | MEDLINE | ID: mdl-38534183

RESUMEN

Vertigo is a complication of craniomaxillofacial contour plastic surgery characterized by dizziness from hypovolemia in the cerebral hemispheres and brainstem. The authors analyzed the current status and influencing factors of postoperative vertigo in patients who undergo craniomaxillofacial contouring and discussed improvements in nursing strategies. The authors investigated 418 patients admitted to the authors' hospital who underwent craniomaxillofacial contouring between November 2020 and October 2023 and divided them into asymptomatic and symptomatic groups based on syncopal precursors or vertigo. The authors screened the current status of vertigo in patients after craniomaxillofacial contouring and the factors affecting vertigo and determined nursing improvement strategies. After craniomaxillofacial contouring, 125 patients had vertigo symptoms. Postcraniomaxillofacial contouring syncope or vertigo was associated with age, patient vertigo history, family history, depression, weight loss, blood pressure at admission, feeding before getting out of bed, and the level of intraoperative hemorrhage Multifactorial logistic regression analysis revealed the association between postcraniomaxillofacial contouring syncope or vertigo and vertigo history, depression, weight loss, feeding before getting out of bed, and intraoperative bleeding volume. Vertigo precursor incidence after craniomaxillofacial contouring surgery is 29.90%. Its influencing factors are complex, suggesting that nurses need to improve the perioperative health education of craniomaxillofacial contouring surgery and optimize the nursing care, encourage patients to have a reasonable diet or provide parenteral nutritional support preoperatively, help patients get out of bed early postoperatively, encourage them to have multiple meals in little quantity before getting out of bed, and control the intraoperative bleeding, to ensure patient safety postoperatively.


Asunto(s)
Complicaciones Posoperatorias , Vértigo , Humanos , Masculino , Femenino , China/epidemiología , Vértigo/etiología , Adulto , Persona de Mediana Edad , Factores de Riesgo , Incidencia , Procedimientos de Cirugía Plástica , Adolescente , Adulto Joven , Síncope/etiología , Anciano
8.
Aesthetic Plast Surg ; 2024 Mar 01.
Artículo en Inglés | MEDLINE | ID: mdl-38429530

RESUMEN

A rare case of trigeminal neuralgia following injections of Hyaluronic Acid and Botox was documented. In addressing the severe pain and swelling caused by the injection, a novel combination therapy was employed, notably including 5-fluorouracil. The significant improvement observed in this case not only provided clinical insights but also spurred further investigation into the underlying mechanisms linking trigeminal nerve damage to local dermal filler injections. The aim was to glean new medical perspectives and develop practical preventive strategies to mitigate such complications in future cases. This approach highlights the importance of understanding and addressing the potential neurological impacts of cosmetic procedures. LEVEL OF EVIDENCE IV: This journal requires that authors assign a level of evidence to each article. For a full description of these Evidence-Based Medicine ratings, please refer to the Table of Contents or the online Instructions to Authors https://www.springer.com/00266 .

9.
Aesthetic Plast Surg ; 2024 Apr 30.
Artículo en Inglés | MEDLINE | ID: mdl-38691173

RESUMEN

BACKGROUND: In recent years, soft tissue materials have been applied as forehead fillers. Some filling materials need to be removed or refilled in a timely manner in certain situations; therefore, it is important to develop a method to identify the location and type of filling materials. This study summarizes the imaging findings of different filling materials under high-frequency ultrasound, providing a reference for clinical treatment. METHODS: We screened facial ultrasound images performed at the Plastic Surgery Hospital of the Chinese Academy of Medical Sciences from April 2015 to July 2023 and classified and summarized the types of frontal filling materials and their imaging results. RESULTS: This study included ultrasound imaging results from 114 patients, including 39 with hyaluronic acid (HA) filling, 45 with polyacrylamide hydrogel (PAG) filling, 14 who received autologous fat transplantation, 2 who received prosthesis implantation, 2 who received both HA and PAG filling, and 12 who received silicone oil filling. HA mainly manifests as an anechoic zone on ultrasonography, with images divisible into four types. PAG primarily presents as fine punctate echoes, divisible into five types. Fat transplantation presents as a low-echo area with uneven density, divisible into five types. Finally, the silicone oil-filling material appears as a cloud-like high echo on the forehead, visible throughout the entire skin layer, and unclear imaging in deep tissues. CONCLUSION: High-frequency ultrasound is a safe and reliable method to evaluate the type and position of forehead filling materials, which can be easily applied in clinical practice. LEVEL OF EVIDENCE IV: This journal requires that authors assign a level of evidence to each article. For a full description of these Evidence-Based Medicine ratings, please refer to the Table of Contents or the online Instructions to Authors www.springer.com/00266 .

10.
Aesthet Surg J ; 2024 Mar 18.
Artículo en Inglés | MEDLINE | ID: mdl-38494986

RESUMEN

BACKGROUND: The injection of botulinum toxin into the masseter muscle is an important method used to improve hypertrophy. However, some patients may experience adverse reactions, such as sagging of the lower jaw. Therefore, we proposed a method of injecting botulinum toxin into the masseter and platysma muscles that would reduce masseter size and enhance the jawline. OBJECTIVES: Reducing the masseter size while enhancing the jawline. METHODS: Twenty patients received botulinum toxin injections into the masseter and platysma muscles. Pain levels were evaluated using the visual analog scale. All patients were photographed before and 6 months after treatment. Evaluations were performed based on standardized criteria. The lift index, reduction index, and symmetry index were used to assess the degree of jawline elevation, masseter size reduction, and jawline symmetry before and after treatment, respectively. RESULTS: The mean visual analog scale score of the 20 patients was 2.80 (±1.24). The mean lift index score decreased from 4.93 (±0.34) to 4.53 (±0.37), P<0.05. The mean reduction index score decreased from 3.13 (±0.27) to 2.74 (±0.27), P<0.05. The mean symmetry index score changed from 0.0393 (±0.0296) to 0.0257 (±0.0246), P<0.05. CONCLUSIONS: Botulinum toxin injections into the masseter and platysma muscles through nerve block reduced the masseter size, elevated the jawline, and improved symmetry.

11.
Aesthet Surg J ; 44(6): 572-579, 2024 May 15.
Artículo en Inglés | MEDLINE | ID: mdl-38366013

RESUMEN

BACKGROUND: Injecting botulinum toxin (BTX) into the submandibular glands (SMGs) can treat drooling symptoms in neurological diseases and improve the aesthetics of SMG hypertrophy and ptotic SMGs. OBJECTIVES: This study aimed to define the size and position of the SMGs by high-frequency ultrasound, and to perform statistical analysis to improve the safety and accuracy of BTX injection therapy. METHODS: Neck ultrasonography with high-frequency ultrasound was performed on 214 volunteers. The length, height, and thickness of the SMGs, and the distance between the SMGs and the midline, the anterior border of the sternocleidomastoid, the mandible, and the surface were measured. RESULTS: The SMGs were almond-shaped with a mean [standard deviation] length of 33.7 [4.7] mm, a thickness of 13.3 [2.9] mm, and a height of 27.6 [6.0] mm. The length and height were significantly different between underage and youth groups. The size of the SMGs did not show any notable differences with increasing BMI; however, their depth, and the distance from the mandible, midline, and anterior border of the sternocleidomastoid increased. No significant differences were observed between the affected and healthy sides in patients with microtia, hemifacial microsomia, or cleft lip and palate. CONCLUSIONS: Ultrasound provides more comprehensive information regarding the size and position of the SMGs, which can serve as a reference in BTX therapy and in the diagnosis of SMG diseases involving size alterations.


Asunto(s)
Glándula Submandibular , Ultrasonografía , Humanos , Femenino , Masculino , Glándula Submandibular/diagnóstico por imagen , Adulto , Ultrasonografía/métodos , Adulto Joven , Adolescente , Persona de Mediana Edad , Niño , Sialorrea/etiología , Sialorrea/diagnóstico por imagen
12.
Risk Anal ; 43(11): 2298-2311, 2023 Nov.
Artículo en Inglés | MEDLINE | ID: mdl-36635059

RESUMEN

The adoption of behavioral nonpharmaceutical interventions (NPIs) among the public is essential for tackling the COVID-19 pandemic, yet presents challenges due to the complexity of human behaviors. A large body of literature has utilized classic game theory to investigate the population's decisions regarding the adoption of interventions, where the static solution concept such as the Nash equilibrium is studied. However, individual adoption behavior is not static, instead it is a dynamic process that involves the strategic interactions with other counterparts over time. The study of quantitatively analyzing the dynamics on precautionary behavior during an outbreak is rather scarce. This article fills the research gap by developing an evolutionary game-theoretic framework to model the dynamics of population behavior on the adoption of NPI. We construct the two-group asymmetric game, where behavioral change for each group is characterized by replicator equations. Sensitivity analyses are performed to examine the long-term stability of equilibrium points with respect to perturbation of model parameters. We found that the limiting behavior of intervention adoption in the population consists of only pure strategies in a game setting, indicating that the evolutionary outcome is that everyone either takes up the preventive measure or not. We also applied the framework to examine the mask-wearing behavior, and validated with actual data. Overall, this article provides insights into population dynamics on the adoption of intervention strategy during the outbreak, which can be beneficial for policy makers to better understand the evolutionary trajectory of population behavior.


Asunto(s)
COVID-19 , Pandemias , Humanos , Pandemias/prevención & control , COVID-19/epidemiología , COVID-19/prevención & control , Dinámica Poblacional , Evolución Biológica , Teoría del Juego
13.
Risk Anal ; 43(6): 1235-1253, 2023 06.
Artículo en Inglés | MEDLINE | ID: mdl-35840122

RESUMEN

The outbreak of pandemics such as COVID-19 can result in cascading effects for global systemic risk. To combat an ongoing pandemic, governmental resources are largely allocated toward supporting the health of the public and economy. This shift in attention can lead to security vulnerabilities which are exploited by terrorists. In view of this, counterterrorism during a pandemic is of critical interest to the safety and well-being of the global society. Most notably, the population flows among potential targets are likely to change in conjunction with the trend of the health crisis, which leads to fluctuations in target valuations. In this situation, a new challenge for the defender is to optimally allocate his/her resources among targets that have changing valuations, where his/her intention is to minimize the expected losses from potential terrorist attacks. In order to deal with this challenge, in this paper, we first develop a defender-attacker game in sequential form, where the target valuations can change as a result of the pandemic. Then we analyze the effects of a pandemic on counterterrorism resource allocation from the perspective of dynamic target valuations. Finally, we provide some examples to display the theoretical results, and present a case study to illustrate the usability of our proposed model during a pandemic.


Asunto(s)
COVID-19 , Terrorismo , Femenino , Masculino , Humanos , Pandemias , Asignación de Recursos , Gobierno
14.
Risk Anal ; 2023 Nov 21.
Artículo en Inglés | MEDLINE | ID: mdl-37988250

RESUMEN

Unauthorized immigration has been a long-standing and contentious challenge for developed and developing countries. Numerous continually evolving push and pull factors across international borders, such as economy, employment, population density, unrest, corruption, and climate have driven this migration. Large-scale pandemics such as COVID-19, causing further instability in countries' financial well-being, can initiate or alter emigration flow from different countries. In light of such a complex confluence of factors, climate change, and demographic shifts in migrant communities, it is high time to shift toward machine learning-reinforced generalized approaches from the traditional parametric approaches based on migrant community-specific localized surveys. To our best knowledge, no literature has explored the nonparametric approach and developed a comprehensive database independent of localized surveys to analyze unauthorized migration. This article fills this gap by deploying nine nonparametric machine learning algorithms for predicting unauthorized immigration flow considering the dynamic border security nexus. This framework considers the Seasonal Autoregressive Integrated Moving Average model as the null model. The proposed novel framework removes the dependency on localized survey-based studies and provides a more cost-effective, faster, and big data-friendly approach. This study finds the Bayesian Additive Regression Tree model as the best predictive model.

15.
J Craniofac Surg ; 34(2): e198-e199, 2023.
Artículo en Inglés | MEDLINE | ID: mdl-36210495

RESUMEN

Using stem cell exosomes to treat alopecia is a new treatment in plastic surgery. However, there are few reports on the complications of this treatment. This study describes a method of using 5-fluorouracil combined with triamcinolone acetonide to treat allergic reactions caused by stem cell exosomes injection. The ultrasound results before treatment showed that the thickness of subcutaneous soft tissue in the forehead was 0.35 cm,the length and short diameter of left retroauricular lymph nodes were 1.11 and 0.46 cm, and the length and short diameter of right retroauricular lymph nodes were 1.10 and 0.45 cm. After treatment, the thickness of subcutaneous soft tissue in the forehead was 0.20 cm, the length and short diameter of the lymph nodes behind the left ear were 1.06 and 0.40 cm, respectively, and the length and short diameter of the lymph nodes behind the right ear were 1.06 and 0.36 cm, respectively. The results of treatment proved that this treatment had a therapeutic effect on the allergy of patients.


Asunto(s)
Anafilaxia , Exosomas , Humanos , Triamcinolona Acetonida , Anafilaxia/tratamiento farmacológico , Fluorouracilo , Glucocorticoides
16.
J Craniofac Surg ; 34(6): e590-e592, 2023 Sep 01.
Artículo en Inglés | MEDLINE | ID: mdl-37336475

RESUMEN

Hyaluronic acid is a commonly used soft tissue filler. However, it has been associated with numerous complications including skin necrosis, loss of vision, and cerebral infarction. In this article, the authors have reported the case of a 25-year-old woman who presented with significant dizziness and pain in the temporal and intrahairline region after undergoing hyaluronic acid augmentation of the temple and inner temporal hairline regions. Subsequently, the patient received 4 doses of a hyaluronidase injection to dissolve the emboli. She demonstrated improvement in clinical symptoms after emboli dissolution. During the 10-month posttreatment follow-up, the patient experienced gradual relief from pain and dizziness. The use of hyaluronic acid fillers should be limited in the intrahairline region as the resulting complications can be difficult to manage.


Asunto(s)
Técnicas Cosméticas , Rellenos Dérmicos , Femenino , Humanos , Adulto , Ácido Hialurónico/efectos adversos , Mareo , Dolor , Piel , Rellenos Dérmicos/efectos adversos , Hialuronoglucosaminidasa
17.
J Craniofac Surg ; 34(5): 1503-1506, 2023.
Artículo en Inglés | MEDLINE | ID: mdl-37254245

RESUMEN

Botulinum toxin and hyaluronic acid injections are commonly used in plastic surgery. However, these treatment methods can also cause adverse events. This article reports a case of herpes zoster that occurred several days after botulinum toxin and hyaluronic acid injections. Antiviral treatment of herpes zoster virus proved successful in managing this complication. Furthermore, several articles concerning injection therapy-induced herpes zoster are reviewed. It is suggested that clinicians should consider herpes zoster in the differential diagnosis of unilateral erythema and papules, following injection therapy, in order to provide timely treatment.


Asunto(s)
Toxinas Botulínicas , Herpes Zóster , Humanos , Herpesvirus Humano 3 , Ácido Hialurónico/efectos adversos , Herpes Zóster/diagnóstico , Herpes Zóster/tratamiento farmacológico , Herpes Zóster/complicaciones
18.
Aesthet Surg J ; 43(11): NP956-NP961, 2023 10 13.
Artículo en Inglés | MEDLINE | ID: mdl-37154084

RESUMEN

BACKGROUND: A profound understanding of the various frontal tissues' morphology and their relationship with forehead lines can efficiently guide clinical treatment. OBJECTIVES: The authors explored the relationship between frontal anatomy and frontal lines. METHODS: We measured the thickness and shape of tissues in different regions of the forehead of 241 Asians. Then, we analyzed the relationship between the types of frontalis muscle and frontal lines, as well as the relationship between the frontal anatomical structures and the production of frontal lines. RESULTS: We classified the types of frontalis muscle into 3 categories comprising 10 subtypes. The skin (0.78 mm vs 0.90 mm, P < .05), superficial subcutaneous tissue (0.66 mm vs 0.75 mm, P < .05), and frontalis muscle thickness (0.29 mm vs 0.37 mm, P < .05) of people with obvious dynamic forehead lines were significantly thicker than those of people without significant dynamic forehead lines. However, no significant difference in the deep subcutaneous tissue thickness was found between people with and without static forehead lines (1.36 mm vs 1.34 mm, P < .05). CONCLUSIONS: This study shows the relationship between the frontal structure and frontal lines. Therefore, these results can provide references for treating frontal lines, to a certain extent.


Asunto(s)
Frente , Piel , Humanos , Frente/diagnóstico por imagen , Frente/anatomía & histología , Ultrasonografía , Piel/diagnóstico por imagen , Tejido Subcutáneo/diagnóstico por imagen
19.
J Exp Bot ; 73(22): 7273-7284, 2022 12 08.
Artículo en Inglés | MEDLINE | ID: mdl-36073837

RESUMEN

High temperature (HT) can affect the accumulation of seed storage materials and cause adverse effects on the yield and quality of rice. DNA methylation plays an important role in plant growth and development. Here, we identified a new demethylase gene OsDML4 and discovered its function in cytosine demethylation to affect endosperm formation. Loss of function of OsDML4 induced chalky endosperm only under HT and dramatically reduced the transcription and accumulation of glutelins and 16 kDa prolamin. The expression of two transcription factor genes RISBZ1 and RPBF was significantly decreased in the osdml4 mutants, which caused adverse effects on the formation of protein bodies (PBs) with greatly decreased PB-II number, and incomplete and abnormally shaped PB-IIs. Whole-genome bisulfite sequencing analysis of seeds at 15 d after pollination revealed much higher global methylation levels of CG, CHG, and CHH contexts in the osdml4 mutants compared with the wild type. Moreover, the RISBZ1 promoter was hypermethylated but the RPBF promoter was almost unchanged under HT. No significant difference was detected between the wild type and osdml4 mutants under normal temperature. Our study demonstrated a novel OsDML4-mediated DNA methylation involved in the formation of chalky endosperm only under HT and provided a new perspective in regulating endosperm development and the accumulation of seed storage proteins in rice.


Asunto(s)
Oryza , Oryza/genética
20.
Phys Rev Lett ; 128(8): 083202, 2022 Feb 25.
Artículo en Inglés | MEDLINE | ID: mdl-35275661

RESUMEN

Optically trapped mixed-species single atom arrays with arbitrary geometry are an attractive and promising platform for various applications, because tunable quantum systems with multiple components provide extra degrees of freedom for experimental control. Here, we report the first demonstration of two-dimensional 6×4 dual-species atom assembly of ^{85}Rb (^{87}Rb) atoms with a filling fraction of 0.88 (0.89). This mixed-species atomic synthesis is achieved via rearranging initially randomly distributed atoms by a sorting algorithm (heuristic heteronuclear algorithm) which is designed for bottom-up atom assembly with both user-defined geometries and two-species atom number ratios. Our fully tunable hybrid-atom systems with scalable advantages are a good starting point for high-fidelity quantum logic, many-body quantum simulation, and single molecule array formation.

SELECCIÓN DE REFERENCIAS
DETALLE DE LA BÚSQUEDA