In Burkina Faso, recent dengue outbreaks were exacerbated by Aedes aegypti mosquitoes, which have developed resistance to conventional insecticides. This study investigates the potential of Metarhizium pingshaense Met...In Burkina Faso, recent dengue outbreaks were exacerbated by Aedes aegypti mosquitoes, which have developed resistance to conventional insecticides. This study investigates the potential of Metarhizium pingshaense Met_S26, a fungus from Burkina Faso, for controlling both endophilic and exophilic Aedes mosquitoes. Traditional interventions are less effective against mosquitoes resting outdoors, and the ability of the fungus to be sexually transmitted could enhance its efficacy. Aedes mosquitoes were reared and exposed to various concentrations of Metarhizium pingshaense to assess its virulence. The fungus showed significant efficacy, with lethal times (LT80) ranging from 8.67 to 11.83 days depending on the concentration. Furthermore, bioassays demonstrated effective sexual auto-dissemination, with substantial transmission of fungal spores between infected and uninfected mosquitoes, leading to lower survival rates in uninfected mates. This study highlights Metarhizium pingshaense Met_S26 as a promising tool for controlling both indoor and outdoor Aedes populations, complementing existing vector control strategies such as the Sterile Insect Technique (SIT) and Wolbachia-based approaches. Future research should explore integrating this fungus with other control methods for a comprehensive vector management strategy.展开更多
Ancient villages in Lingnan serve as crucial carriers of Lingnan culture.Their abundant cultural symbols now face the dual task of inheritance and innovation in the digital era.Drawing on Stuart Hall’s encoding/decod...Ancient villages in Lingnan serve as crucial carriers of Lingnan culture.Their abundant cultural symbols now face the dual task of inheritance and innovation in the digital era.Drawing on Stuart Hall’s encoding/decoding theory,this study explores how representative cultural symbols of Lingnan’s ancient villages are digitally translated and disseminated.By analyzing specific cases,it elucidates the logic of audience interaction and consumption during the decoding of these digital cultural symbols.This study aims to offer valuable insights for revitalizing ancient village culture and informing its sustainable industrial development.展开更多
Ideological and political education in higher education institutions is currently facing the practical challenge of discourse transformation.Traditional theoretical indoctrination models are unable to effectively alig...Ideological and political education in higher education institutions is currently facing the practical challenge of discourse transformation.Traditional theoretical indoctrination models are unable to effectively align with the cognitive characteristics and acceptance habits of young people.With the profound changes in the media ecosystem,the ideological and political discourse system urgently needs to transition from a one-way communication model to an interactive dialogue model.This paper focuses on the bidirectional construction logic of“concise extraction”and“concise dissemination,”revealing the innovative characteristics of the ideological and political discourse system in content creation,dissemination methods,and talent cultivation mechanisms under the new era.It provides new theoretical perspectives and practical reference frameworks for addressing the challenges of insufficient effectiveness in ideological and political education.展开更多
The current international dissemination of China’s human rights discourse predominantly adopts a“sender-oriented”model,emphasizing the output of human rights discourse by transmitters while overlooking strategy adj...The current international dissemination of China’s human rights discourse predominantly adopts a“sender-oriented”model,emphasizing the output of human rights discourse by transmitters while overlooking strategy adjustments based on audience feedback.To some extent,the current approach has resulted in characteristics such as strong practical implementation but weak discourse,limited theoretical foundation,and insufficient recognition in China’s international human rights communication.Consequently,while China has achieved remarkable progress in its human rights endeavors,human rights issues remain a critical area of stigmatization by some Western countries.An“effect-oriented”mechanism for the international dissemination of China’s human rights discourse,therefore,aims to address this challenge by re-centering the audience as active participants in the communication process.By emphasizing the dual nature of human rights’international communication,this approach leverages the reflexive monitoring of initial transmitters throughout the dissemination process to finally construct a dynamic human rights discourse framework responsive to different time and space contexts.This mechanism directly confronts the diverse backgrounds of global audiences and the resulting varied interpretations of China’s human rights discourse.It advocates for dynamic evaluation of global dissemination outcomes based on audience feedback and the timely adaptation of communication strategies according to context.By doing so,it seeks to effectively advance China’s human rights communication efforts and enhance dissemination efficiency on the global scale.展开更多
This study adopts a communication studies perspective,employing Lasswell’s“5W”model as the theoretical framework and integrating the“6W”elements of translation communication to systematically examine the translat...This study adopts a communication studies perspective,employing Lasswell’s“5W”model as the theoretical framework and integrating the“6W”elements of translation communication to systematically examine the translation and dissemination model of the English version of Mo Yan’s novel“Life and Death Are Wearing Me Out,”translated by Howard Goldblatt.By analyzing key elements such as communication content,translator strategies,dissemination channels,and reader reception,the study elucidates the intrinsic mechanisms behind the work’s successful overseas dissemination.The findings reveal that effective communication stems from the synergistic interplay of four dimensions:the intercultural adaptability of the work itself,the translator’s agential mediation,diversified dissemination channels,and reader-oriented translation strategies.This research provides theoretical and practical insights for promoting Chinese literature globally,demonstrating that successful intercultural communication requires an integrated approach encompassing the work,translator,channels,and reader research.展开更多
In recent years, wildlife conservation has attracted great public attention. However, substantial distinctions can be found in the prevailing concepts of wildlife conservation, particularly with the recent notion that...In recent years, wildlife conservation has attracted great public attention. However, substantial distinctions can be found in the prevailing concepts of wildlife conservation, particularly with the recent notion that emphasizes animal rights. Wildlife welfare and wildlife rights are not synonymous, with welfare more compatible with the reasonable and legal utilization of wildlife. The key to scientific wildlife conservation is the appropriate awareness and appreciation of the relationship between wildlife conservation and utilization and the theoretical basis of holism. Nevertheless, rational biases regarding the public＇s understanding of wildlife conservation and the spread of information via social media still exist. As such, expansion of the concept of scientific wildlife conservation requires the application of several measures. Wildlife conservation researchers should be regarded as the most important disseminators of scientifically-based information, with education in schools and universities of growing importance. Furthermore, the media should shoulder the social responsibility for the accurate dissemination of conservation information.展开更多
The international dissemination of TCM culture, as a carrier of the implementation of the"Belt and Road"Initiative, is being endowed with greater importance. However, the spread of TCM culture into the world...The international dissemination of TCM culture, as a carrier of the implementation of the"Belt and Road"Initiative, is being endowed with greater importance. However, the spread of TCM culture into the world faces opportunities as well as challenges. To better serve the"Belt and Road"Initiative, measures should be taken to strengthen TCM communication and cooperation in different aspects and build a sound intellectual property protection system.展开更多
Peritoneal dissemination represents a devastating form of gastric cancer(GC) progression with a dismal prognosis. There is no effective therapy for this condition. The 5-year survival rate of patients with peritoneal ...Peritoneal dissemination represents a devastating form of gastric cancer(GC) progression with a dismal prognosis. There is no effective therapy for this condition. The 5-year survival rate of patients with peritoneal dissemination is 2%, even including patients with only microscopic free cancer cells without macroscopic peritoneal nodules. The mechanism of peritoneal dissemination of GC involves several steps: detachment of cancer cells from the primary tumor, survival in the free abdominal cavity, attachment to the distant peritoneum, invasion into the subperitoneal space and proliferation with angiogenesis. These steps are not mutually exclusive, and combinations of different molecular mechanisms can occur in each process of peritoneal dissemination. A comprehensive understanding of the molecular events involved in peritoneal dissemination is important and should be systematically pursued. It is crucial to identify novel strategies for the prevention of this condition and for identification of markers of prognosis and the development of molecular-targeted therapies. In this review, we provide an overview of recently published articles addressing the molecular mechanisms of peritoneal dissemination of GC to provide an update on what is currently known in this field and to propose novel promising candidates for use in diagnosis and as therapeutic targets.展开更多
Objective： The predictive and prognostic role of prognostic nutritional index（PNI） in gastric cancer patients with peritoneal dissemination remains unclear. This study aims to explore the role of the PNI in predict...Objective： The predictive and prognostic role of prognostic nutritional index（PNI） in gastric cancer patients with peritoneal dissemination remains unclear. This study aims to explore the role of the PNI in predicting outcomes of gastric cancer patients with peritoneal dissemination.Methods： A total of 660 patients diagnosed with gastric adenocarcinoma with peritoneal metastasis between January 2000 and April 2014 at Sun Yat-sen University Cancer Center and the Sixth Affiliated Hospital of Sun Yatsen University were retrospectively analyzed. The clinicopathologic characteristics and clinical outcomes of patients with peritoneal dissemination were analyzed.Results： Compared with PNI-high group, PNI-low group was correlated with advanced age（P=0.036）, worse performance status（P0.001）, higher frequency of ascites（P0.001） and higher frequency of multisite distant metastasis（P0.001）. Kaplan-Meier survival curves showed that PNI-high group had a significantly longer median overall survival than PNI-low group（13.13 vs. 9.03 months, P0.001）. Multivariate survival analysis revealed that Borrmann type IV（P=0.014）, presence of ascites（P=0.017） and lower PNI（P=0.041） were independent poor prognostic factors, and palliative surgery（P0.001） and first-line chemotherapy（P0.001） were good prognostic factors. For patients receiving palliative surgery, the postoperative morbidity rates in the PNI-low group and PNIhigh group were 9.1% and 9.9%, respectively（P=0.797）. The postoperative mortality rate was not significantly different between PNI-low and PNI-high groups（2.3% vs. 0.9%, P=0.362）.Conclusions： PNI is a useful and practical tool for evaluating the nutritional status of gastric cancer patients with peritoneal dissemination, and is an independent prognostic factor for these patients.展开更多
Mineral dissemination and pore space distribution in ore particles are important features that influence heap leaching performance.To quantify the mineral dissemination and pore space distribution of an ore particle,a...Mineral dissemination and pore space distribution in ore particles are important features that influence heap leaching performance.To quantify the mineral dissemination and pore space distribution of an ore particle,a cylindrical copper oxide ore sample(I center dot 4.6 mm x 5.6 mm)was scanned using high-resolution X-ray computed tomography(HRXCT),a nondestructive imaging technology,at a spatial resolution of 4.85 mu m.Combined with three-dimensional(3D)image analysis techniques,the main mineral phases and pore space were segmented and the volume fraction of each phase was calculated.In addition,the mass fraction of each mineral phase was estimated and the result was validated with that obtained using traditional techniques.Furthermore,the pore phase features,including the pore size distribution,pore surface area,pore fractal dimension,pore centerline,and the pore connectivity,were investigated quantitatively.The pore space analysis results indicate that the pore size distribution closely fits a log-normal distribution and that the pore space morphology is complicated,with a large surface area and low connectivity.This study demonstrates that the combination of HRXCT and 3D image analysis is an effective tool for acquiring 3D mineralogical and pore structural data.展开更多
Objective： To identify independent prognostic factors to be included in a nomogram to predict the prognosis ofgastric cancer patients with peritoneal dissemination.Methods： This is a retrospective study on 684 patie...Objective： To identify independent prognostic factors to be included in a nomogram to predict the prognosis ofgastric cancer patients with peritoneal dissemination.Methods： This is a retrospective study on 684 patients with a histological diagnosis of gastric cancer withperitoneal dissemination from the Sun Yat-sen University Cancer Center as the development set, and 62 gastriccancer patients from the Sixth Affiliated Hospital of Sun Yat-sen University as the validation group. Chi-square testand Cox regression analysis were used to compare the clinicopathological variables and the prognosis of gastriccancer patients with peritoneal dissemination. The Harrell＇s concordance index （C-index） and calibration curvewere determined for comparisons of predictive ability of the nomogram.Results： Univariate and multivariate analyses showed that serum carcinoembryonic antigen （CEA） level（P=0.032）, ascites grading （P=0.008）, presence of extraperitoneal metastasis （P〈0.001）, seeding status （P=0.016） andperformance status （P=0.009） were independent prognostic factors for gastric cancer patients with peritonealdissemination in the development set. The nomogram model was constructed using these five factors. Internalvalidation showed that the C-index of the model was 0.641. For the external validation, the C-index of this modelwas 0.709.Conclusions： We developed and validated a nomogram to predict the prognosis for gastric cancer patients withperitoneal dissemination. This nomogram may play an important clinical role in guiding palliative therapy for thesetypes of patients, although it may need more data for optimization.展开更多
Objective:Peritoneal dissemination is difficult to diagnose by conventional imaging technologies.We aimed to construct a nomogram to predict peritoneal dissemination in gastric cancer(GC)patients.Methods:We retrospect...Objective:Peritoneal dissemination is difficult to diagnose by conventional imaging technologies.We aimed to construct a nomogram to predict peritoneal dissemination in gastric cancer(GC)patients.Methods:We retrospectively analyzed 1,112 GC patients in Sun Yat-sen University Cancer Center between2001 and 2010 as the development set and 474 patients from The Sixth Affiliated Hospital,Sun Yat-sen University between 2010 and 2016 as the validation set.The clinicopathological variables associated with gastric cancer with peritoneal dissemination(GCPD)were analyzed.We used logistic regression analysis to identify independent risk factors for peritoneal dissemination.Then,we constructed a nomogram for the prediction of GCPD and defined its predictive value with a receiver operating characteristic(ROC)curve.External validation was performed to validate the applicability of the nomogram.Results:In total,250 patients were histologically identified as having peritoneal dissemination.Logistic regression analysis demonstrated that age,sex,tumor location,tumor size,signet-ring cell carcinoma(SRCC),T stage,N stage and Borrmann classification IV(Borrmann IV)were independent risk factors for peritoneal dissemination.We constructed a nomogram consisting of these eight factors to predict GCPD and found an optimistic predictive capability,with a C-index of 0.791,an area under the curve(AUC)of 0.791,and a 95%confidence interval(95%CI)of 0.762-0.820.The results found in the external validation set were also promising.Conclusions:We constructed a highly sensitive nomogram that can assist clinicians in the early diagnosis of GCPD and serve as a reference for optimizing clinical management strategies.展开更多
In opportunistic networks, most existing buffer management policies including scheduling and passive dropping policies are mainly for routing protocols. In this paper, we proposed a Utility-based Buffer Management str...In opportunistic networks, most existing buffer management policies including scheduling and passive dropping policies are mainly for routing protocols. In this paper, we proposed a Utility-based Buffer Management strategy(UBM) for data dissemination in opportunistic networks. In UBM, we first design a method of computing the utility values of caching messages according to the interest of nodes and the delivery probability of messages, and then propose an overall buffer management policy based on the utility. UBM driven by receivers completely implements not only caching policies, passive and proactive dropping policies, but also scheduling policies of senders. Simulation results show that, compared with some classical dropping strategies, UBM can obtain higher delivery ratio and lower delay latency by using smaller network cost.展开更多
BACKGROUND Endoscopic ultrasound-guided fine needle aspiration(EUS-FNA)is a biopsy technique widely used to diagnose pancreatic tumors because of its high sensitivity and specificity.Although needle-tract seeding caus...BACKGROUND Endoscopic ultrasound-guided fine needle aspiration(EUS-FNA)is a biopsy technique widely used to diagnose pancreatic tumors because of its high sensitivity and specificity.Although needle-tract seeding caused by EUS-FNA has been recently reported,dissemination of pancreatic cancer cells is generally considered to be a rare complication that does not affect patient prognosis.However,the frequency of dissemination and needle-tract seeding appears to have been underestimated.We present a case of peritoneal dissemination of pancreatic cancer due to preoperative EUS-FNA.CASE SUMMARY An 81-year-old man was referred to the Department of Surgery of our hospital in Japan owing to the detection of a pancreatic mass on computed tomography during medical screening.Trans-gastric EUS-FNA revealed that the mass was an adenocarcinoma;hence laparoscopic distal pancreatectomy with lymphadenectomy was performed.No intraoperative peritoneal dissemination and liver metastasis were visually detected,and pelvic lavage cytology was negative for carcinoma cells.The postoperative surgical specimen was negative for carcinoma cells at the dissected margin and the cut end margin;however,pathological findings revealed adenocarcinoma cells on the peritoneal surface proximal to the needle puncture site,and the cells were suspected to be disseminated via EUSFNA.Hence,the patient received adjuvant therapy with S-1(tegafur,gimeracil,and oteracil potassium);however,computed tomography performed 5 mo after surgery revealed liver metastasis and cancerous peritonitis.The patient received palliative therapy and died 8 mo after the operation.CONCLUSION The indications of EUS-FNA should be carefully considered to avoid iatrogenic dissemination,especially for cancers in the pancreatic body or tail.展开更多
文摘In Burkina Faso, recent dengue outbreaks were exacerbated by Aedes aegypti mosquitoes, which have developed resistance to conventional insecticides. This study investigates the potential of Metarhizium pingshaense Met_S26, a fungus from Burkina Faso, for controlling both endophilic and exophilic Aedes mosquitoes. Traditional interventions are less effective against mosquitoes resting outdoors, and the ability of the fungus to be sexually transmitted could enhance its efficacy. Aedes mosquitoes were reared and exposed to various concentrations of Metarhizium pingshaense to assess its virulence. The fungus showed significant efficacy, with lethal times (LT80) ranging from 8.67 to 11.83 days depending on the concentration. Furthermore, bioassays demonstrated effective sexual auto-dissemination, with substantial transmission of fungal spores between infected and uninfected mosquitoes, leading to lower survival rates in uninfected mates. This study highlights Metarhizium pingshaense Met_S26 as a promising tool for controlling both indoor and outdoor Aedes populations, complementing existing vector control strategies such as the Sterile Insect Technique (SIT) and Wolbachia-based approaches. Future research should explore integrating this fungus with other control methods for a comprehensive vector management strategy.
基金2025 Institutional-Level Scientific Research Project of South China Business College,Guangdong University of Foreign Studies,“Digital Dissemination and Consumer Behaviour Research:Cultural Symbols of Lingnan Heritage Villages”(Project No.:25-005C)。
文摘Ancient villages in Lingnan serve as crucial carriers of Lingnan culture.Their abundant cultural symbols now face the dual task of inheritance and innovation in the digital era.Drawing on Stuart Hall’s encoding/decoding theory,this study explores how representative cultural symbols of Lingnan’s ancient villages are digitally translated and disseminated.By analyzing specific cases,it elucidates the logic of audience interaction and consumption during the decoding of these digital cultural symbols.This study aims to offer valuable insights for revitalizing ancient village culture and informing its sustainable industrial development.
文摘Ideological and political education in higher education institutions is currently facing the practical challenge of discourse transformation.Traditional theoretical indoctrination models are unable to effectively align with the cognitive characteristics and acceptance habits of young people.With the profound changes in the media ecosystem,the ideological and political discourse system urgently needs to transition from a one-way communication model to an interactive dialogue model.This paper focuses on the bidirectional construction logic of“concise extraction”and“concise dissemination,”revealing the innovative characteristics of the ideological and political discourse system in content creation,dissemination methods,and talent cultivation mechanisms under the new era.It provides new theoretical perspectives and practical reference frameworks for addressing the challenges of insufficient effectiveness in ideological and political education.
基金This paper is a phased outcome of the“Research on the Strategy to Improve the Mechanism for the International Dissemination of China’s Human Rights Discourse”(22JJD820045),a key research project of the National Human Rights Education and Training Base under China’s Ministry of Education.
文摘The current international dissemination of China’s human rights discourse predominantly adopts a“sender-oriented”model,emphasizing the output of human rights discourse by transmitters while overlooking strategy adjustments based on audience feedback.To some extent,the current approach has resulted in characteristics such as strong practical implementation but weak discourse,limited theoretical foundation,and insufficient recognition in China’s international human rights communication.Consequently,while China has achieved remarkable progress in its human rights endeavors,human rights issues remain a critical area of stigmatization by some Western countries.An“effect-oriented”mechanism for the international dissemination of China’s human rights discourse,therefore,aims to address this challenge by re-centering the audience as active participants in the communication process.By emphasizing the dual nature of human rights’international communication,this approach leverages the reflexive monitoring of initial transmitters throughout the dissemination process to finally construct a dynamic human rights discourse framework responsive to different time and space contexts.This mechanism directly confronts the diverse backgrounds of global audiences and the resulting varied interpretations of China’s human rights discourse.It advocates for dynamic evaluation of global dissemination outcomes based on audience feedback and the timely adaptation of communication strategies according to context.By doing so,it seeks to effectively advance China’s human rights communication efforts and enhance dissemination efficiency on the global scale.
基金2024 Jiangsu Normal University Postgraduate Research and Practice Innovation Program(Project No.:2024XKT1750)。
文摘This study adopts a communication studies perspective,employing Lasswell’s“5W”model as the theoretical framework and integrating the“6W”elements of translation communication to systematically examine the translation and dissemination model of the English version of Mo Yan’s novel“Life and Death Are Wearing Me Out,”translated by Howard Goldblatt.By analyzing key elements such as communication content,translator strategies,dissemination channels,and reader reception,the study elucidates the intrinsic mechanisms behind the work’s successful overseas dissemination.The findings reveal that effective communication stems from the synergistic interplay of four dimensions:the intercultural adaptability of the work itself,the translator’s agential mediation,diversified dissemination channels,and reader-oriented translation strategies.This research provides theoretical and practical insights for promoting Chinese literature globally,demonstrating that successful intercultural communication requires an integrated approach encompassing the work,translator,channels,and reader research.
文摘In recent years, wildlife conservation has attracted great public attention. However, substantial distinctions can be found in the prevailing concepts of wildlife conservation, particularly with the recent notion that emphasizes animal rights. Wildlife welfare and wildlife rights are not synonymous, with welfare more compatible with the reasonable and legal utilization of wildlife. The key to scientific wildlife conservation is the appropriate awareness and appreciation of the relationship between wildlife conservation and utilization and the theoretical basis of holism. Nevertheless, rational biases regarding the public＇s understanding of wildlife conservation and the spread of information via social media still exist. As such, expansion of the concept of scientific wildlife conservation requires the application of several measures. Wildlife conservation researchers should be regarded as the most important disseminators of scientifically-based information, with education in schools and universities of growing importance. Furthermore, the media should shoulder the social responsibility for the accurate dissemination of conservation information.
基金sponsored by academic programs of Hubei provincial department of education(15Q112)
文摘The international dissemination of TCM culture, as a carrier of the implementation of the"Belt and Road"Initiative, is being endowed with greater importance. However, the spread of TCM culture into the world faces opportunities as well as challenges. To better serve the"Belt and Road"Initiative, measures should be taken to strengthen TCM communication and cooperation in different aspects and build a sound intellectual property protection system.
文摘Peritoneal dissemination represents a devastating form of gastric cancer(GC) progression with a dismal prognosis. There is no effective therapy for this condition. The 5-year survival rate of patients with peritoneal dissemination is 2%, even including patients with only microscopic free cancer cells without macroscopic peritoneal nodules. The mechanism of peritoneal dissemination of GC involves several steps: detachment of cancer cells from the primary tumor, survival in the free abdominal cavity, attachment to the distant peritoneum, invasion into the subperitoneal space and proliferation with angiogenesis. These steps are not mutually exclusive, and combinations of different molecular mechanisms can occur in each process of peritoneal dissemination. A comprehensive understanding of the molecular events involved in peritoneal dissemination is important and should be systematically pursued. It is crucial to identify novel strategies for the prevention of this condition and for identification of markers of prognosis and the development of molecular-targeted therapies. In this review, we provide an overview of recently published articles addressing the molecular mechanisms of peritoneal dissemination of GC to provide an update on what is currently known in this field and to propose novel promising candidates for use in diagnosis and as therapeutic targets.
基金supported in part by a grant from National Natural Science Foundation of China(No.81302144)the Guangdong Science and Technology Department(No.2012B061700087)
文摘Objective： The predictive and prognostic role of prognostic nutritional index（PNI） in gastric cancer patients with peritoneal dissemination remains unclear. This study aims to explore the role of the PNI in predicting outcomes of gastric cancer patients with peritoneal dissemination.Methods： A total of 660 patients diagnosed with gastric adenocarcinoma with peritoneal metastasis between January 2000 and April 2014 at Sun Yat-sen University Cancer Center and the Sixth Affiliated Hospital of Sun Yatsen University were retrospectively analyzed. The clinicopathologic characteristics and clinical outcomes of patients with peritoneal dissemination were analyzed.Results： Compared with PNI-high group, PNI-low group was correlated with advanced age（P=0.036）, worse performance status（P0.001）, higher frequency of ascites（P0.001） and higher frequency of multisite distant metastasis（P0.001）. Kaplan-Meier survival curves showed that PNI-high group had a significantly longer median overall survival than PNI-low group（13.13 vs. 9.03 months, P0.001）. Multivariate survival analysis revealed that Borrmann type IV（P=0.014）, presence of ascites（P=0.017） and lower PNI（P=0.041） were independent poor prognostic factors, and palliative surgery（P0.001） and first-line chemotherapy（P0.001） were good prognostic factors. For patients receiving palliative surgery, the postoperative morbidity rates in the PNI-low group and PNIhigh group were 9.1% and 9.9%, respectively（P=0.797）. The postoperative mortality rate was not significantly different between PNI-low and PNI-high groups（2.3% vs. 0.9%, P=0.362）.Conclusions： PNI is a useful and practical tool for evaluating the nutritional status of gastric cancer patients with peritoneal dissemination, and is an independent prognostic factor for these patients.
基金financially supported by the National Natural Science Foundation of China(No.51304076)the Natural Science Foundation of Hunan Province,China(No.14JJ4064)
文摘Mineral dissemination and pore space distribution in ore particles are important features that influence heap leaching performance.To quantify the mineral dissemination and pore space distribution of an ore particle,a cylindrical copper oxide ore sample(I center dot 4.6 mm x 5.6 mm)was scanned using high-resolution X-ray computed tomography(HRXCT),a nondestructive imaging technology,at a spatial resolution of 4.85 mu m.Combined with three-dimensional(3D)image analysis techniques,the main mineral phases and pore space were segmented and the volume fraction of each phase was calculated.In addition,the mass fraction of each mineral phase was estimated and the result was validated with that obtained using traditional techniques.Furthermore,the pore phase features,including the pore size distribution,pore surface area,pore fractal dimension,pore centerline,and the pore connectivity,were investigated quantitatively.The pore space analysis results indicate that the pore size distribution closely fits a log-normal distribution and that the pore space morphology is complicated,with a large surface area and low connectivity.This study demonstrates that the combination of HRXCT and 3D image analysis is an effective tool for acquiring 3D mineralogical and pore structural data.
基金supported in part by a major special project grant from Guangzhou Health and Medical Collaborative Innovation (No. 15570006)the Tianhe District Science and Technology Project, Guangdong, China (No. 201434KW020)
文摘Objective： To identify independent prognostic factors to be included in a nomogram to predict the prognosis ofgastric cancer patients with peritoneal dissemination.Methods： This is a retrospective study on 684 patients with a histological diagnosis of gastric cancer withperitoneal dissemination from the Sun Yat-sen University Cancer Center as the development set, and 62 gastriccancer patients from the Sixth Affiliated Hospital of Sun Yat-sen University as the validation group. Chi-square testand Cox regression analysis were used to compare the clinicopathological variables and the prognosis of gastriccancer patients with peritoneal dissemination. The Harrell＇s concordance index （C-index） and calibration curvewere determined for comparisons of predictive ability of the nomogram.Results： Univariate and multivariate analyses showed that serum carcinoembryonic antigen （CEA） level（P=0.032）, ascites grading （P=0.008）, presence of extraperitoneal metastasis （P〈0.001）, seeding status （P=0.016） andperformance status （P=0.009） were independent prognostic factors for gastric cancer patients with peritonealdissemination in the development set. The nomogram model was constructed using these five factors. Internalvalidation showed that the C-index of the model was 0.641. For the external validation, the C-index of this modelwas 0.709.Conclusions： We developed and validated a nomogram to predict the prognosis for gastric cancer patients withperitoneal dissemination. This nomogram may play an important clinical role in guiding palliative therapy for thesetypes of patients, although it may need more data for optimization.
基金supported by Young Teacher Foundation of Sun Yat-sen University(No.17ykpy65)The Sun Yat-sen University(No.53000-71020005)National Key Clinical Discipline。
文摘Objective:Peritoneal dissemination is difficult to diagnose by conventional imaging technologies.We aimed to construct a nomogram to predict peritoneal dissemination in gastric cancer(GC)patients.Methods:We retrospectively analyzed 1,112 GC patients in Sun Yat-sen University Cancer Center between2001 and 2010 as the development set and 474 patients from The Sixth Affiliated Hospital,Sun Yat-sen University between 2010 and 2016 as the validation set.The clinicopathological variables associated with gastric cancer with peritoneal dissemination(GCPD)were analyzed.We used logistic regression analysis to identify independent risk factors for peritoneal dissemination.Then,we constructed a nomogram for the prediction of GCPD and defined its predictive value with a receiver operating characteristic(ROC)curve.External validation was performed to validate the applicability of the nomogram.Results:In total,250 patients were histologically identified as having peritoneal dissemination.Logistic regression analysis demonstrated that age,sex,tumor location,tumor size,signet-ring cell carcinoma(SRCC),T stage,N stage and Borrmann classification IV(Borrmann IV)were independent risk factors for peritoneal dissemination.We constructed a nomogram consisting of these eight factors to predict GCPD and found an optimistic predictive capability,with a C-index of 0.791,an area under the curve(AUC)of 0.791,and a 95%confidence interval(95%CI)of 0.762-0.820.The results found in the external validation set were also promising.Conclusions:We constructed a highly sensitive nomogram that can assist clinicians in the early diagnosis of GCPD and serve as a reference for optimizing clinical management strategies.
基金supported by the National Natural Science Fund of China under Grant No. 61472097the Education Ministry Doctoral Research Foundation of China (20132304110017)the International Exchange Program of Harbin Engineering University for Innovation-oriented Talents Cultivation
文摘In opportunistic networks, most existing buffer management policies including scheduling and passive dropping policies are mainly for routing protocols. In this paper, we proposed a Utility-based Buffer Management strategy(UBM) for data dissemination in opportunistic networks. In UBM, we first design a method of computing the utility values of caching messages according to the interest of nodes and the delivery probability of messages, and then propose an overall buffer management policy based on the utility. UBM driven by receivers completely implements not only caching policies, passive and proactive dropping policies, but also scheduling policies of senders. Simulation results show that, compared with some classical dropping strategies, UBM can obtain higher delivery ratio and lower delay latency by using smaller network cost.
文摘BACKGROUND Endoscopic ultrasound-guided fine needle aspiration(EUS-FNA)is a biopsy technique widely used to diagnose pancreatic tumors because of its high sensitivity and specificity.Although needle-tract seeding caused by EUS-FNA has been recently reported,dissemination of pancreatic cancer cells is generally considered to be a rare complication that does not affect patient prognosis.However,the frequency of dissemination and needle-tract seeding appears to have been underestimated.We present a case of peritoneal dissemination of pancreatic cancer due to preoperative EUS-FNA.CASE SUMMARY An 81-year-old man was referred to the Department of Surgery of our hospital in Japan owing to the detection of a pancreatic mass on computed tomography during medical screening.Trans-gastric EUS-FNA revealed that the mass was an adenocarcinoma;hence laparoscopic distal pancreatectomy with lymphadenectomy was performed.No intraoperative peritoneal dissemination and liver metastasis were visually detected,and pelvic lavage cytology was negative for carcinoma cells.The postoperative surgical specimen was negative for carcinoma cells at the dissected margin and the cut end margin;however,pathological findings revealed adenocarcinoma cells on the peritoneal surface proximal to the needle puncture site,and the cells were suspected to be disseminated via EUSFNA.Hence,the patient received adjuvant therapy with S-1(tegafur,gimeracil,and oteracil potassium);however,computed tomography performed 5 mo after surgery revealed liver metastasis and cancerous peritonitis.The patient received palliative therapy and died 8 mo after the operation.CONCLUSION The indications of EUS-FNA should be carefully considered to avoid iatrogenic dissemination,especially for cancers in the pancreatic body or tail.
