The invasive insect pest, red palm weevil (RPW), Rhynchophorus ferrugineus, poses a significant threat to date production, causing substantial economic damage. If uncontrolled, RPW leads the severely infested host tre...The invasive insect pest, red palm weevil (RPW), Rhynchophorus ferrugineus, poses a significant threat to date production, causing substantial economic damage. If uncontrolled, RPW leads the severely infested host tree to collapse and eventually die. The symbiotic associations with microorganisms and RPW in their gut may help their host insects’ establishment, development, nutrition assimilation, and survival. The objective of this research was the molecular characterization of the microbiome of RPW. In this study, the microbiome was compared among different tissues in females and males of RPW of three different morphs and larvae collected from date palm plantations in the Kingdom of Bahrain. A 251-bp segment of bacterial 16S rRNA was amplified by PCR, sequenced, and processed using the bioinformatics platform QIIME2. One ASV, corresponding to the obligate weevil symbiont Nardonella, predominated in adult female samples, constituting 56 ± 7% of total reads, but was less dominant in male samples (12 ± 3%) and larval samples (2.6 ± 1.9%). For females, samples that included reproductive tissues were almost entirely composed of Nardonella (88% - 99%). When Nardonella was excluded from analyses, there were no differences between adult females and adult males, but larval samples were more species-rich and differed in microbial composition from adults. There were no consistent differences in the microbiomes among morphs. Several specimens showed evidence of infection with host-specific strains of Spiroplasma-like members of the Entomoplasmatales, which are often pathogens or vertically transmitted symbionts. Such close microbial associates deserve additional attention as potential routes to control this destructive date palm pest.展开更多
BACKGROUND Acanthosis nigricans(AN),Leser–Trélat sign,and tripe palm are all skin diseases.To date,reports of these appearing as a paraneoplastic syndrome in a gastric cancer patient are quite rare.CASE SUMMARY ...BACKGROUND Acanthosis nigricans(AN),Leser–Trélat sign,and tripe palm are all skin diseases.To date,reports of these appearing as a paraneoplastic syndrome in a gastric cancer patient are quite rare.CASE SUMMARY We report the case of a 61-year-old man with darkened skin color in the face and torso with no obvious inducement after 1 year of treatment for Riehl’s melanosis.He had 40 brown maculopapular eruptions on his face and the top of his head with obvious itching.Papillary wart-like hyperkeratosis with dark brown pigmentation was also observed on both sides of the areola.He had papillomalike lesions on the face,around the orbit,and on the neck.His bilateral palms had small,smooth,papillary projections with millet-like appearance.Histopathological examination of the skin showed that the patient was suffering from AN,tripe palms,and Leser–Trélat sign.Gastroscopy showed the patient’s cardia was affected,and pathological biopsy revealed that he had moderate-to-poorly differentiated adenocarcinoma.Computed tomography test results showed that his cardia wall had thickened.Based on these histological and skin characteristics,the patient was diagnosed with gastric cancer with AN,tripe palms,and Leser–Trélat sign.CONCLUSION Researchers should follow up on patients with malignant AN,Leser–Trélat sign,and tripe palms.展开更多
2003年12月8日，PalmSource有限公司隆重召开了第二届中国开发人员大会。PalmSource公司总裁兼首席执行官David Nagel先生在开幕主题演讲中宣布．由联想公司制造的集成了Palm OS PIM功能和多媒体功能的全新Palm Powered掌上设备P100及P...2003年12月8日，PalmSource有限公司隆重召开了第二届中国开发人员大会。PalmSource公司总裁兼首席执行官David Nagel先生在开幕主题演讲中宣布．由联想公司制造的集成了Palm OS PIM功能和多媒体功能的全新Palm Powered掌上设备P100及P300隆重上市，同时还宣布方正科技集团股份有限公司成为Palm OS许可厂商，展开更多
This paper summarizes our studies on metal and metalloid uptake by the date palm, Phoenix dactylifera L., a tree of considerable importance in arid regions. The typical concentrations of 17 elements in the date palm a...This paper summarizes our studies on metal and metalloid uptake by the date palm, Phoenix dactylifera L., a tree of considerable importance in arid regions. The typical concentrations of 17 elements in the date palm are summarized and compared with existing data in the scientific literature. The role and toxicity of these elements are considered. Issues encountered by us during sample collection, pre-treatment and chemical analysis are described. Future studies are suggested.展开更多
The wax palm (Ceroxylon echinulatum) and palm heart (Prestoea acuminata) are key elements in Andean natural forests. This ecosystem is threatened by deforestation and habitat degradation, thus, it is vital to explore ...The wax palm (Ceroxylon echinulatum) and palm heart (Prestoea acuminata) are key elements in Andean natural forests. This ecosystem is threatened by deforestation and habitat degradation, thus, it is vital to explore the impact of anthropogenic activities on the ecological structure and preferences of these species in order to develop proper conservation strategies. Fifty-seven 400 m2 plots were established in two forest areas, a disturbed forest (n = 30 plots) and an undisturbed forest (n = 27 plots) in the Ecuadorean Andes. Nine micro-environmental variables and the number of individuals of C. echinulatum and P. acuminata in five size classes were recorded in each plot. Logistic regression models helped identify environmental variables that influence the establishment of the species. Results showed that different micro-environmental variables determined the presence of different size classes. Both species were benefitted by the environmental conditions of the disturbed forest. Light availability was important for the establishment of both species, especially for the canopy species (C. echinulatum). This palm was negatively affected by the variable “fallen wood”, while P. acuminata was negatively affected mainly by the steepness of the terrain. The environmental variables for the successful establishment of the studied species that were identified by this study provide clues for the sustainable management of C. echinulatum and P. acuminata in Andean forests.展开更多
文摘The invasive insect pest, red palm weevil (RPW), Rhynchophorus ferrugineus, poses a significant threat to date production, causing substantial economic damage. If uncontrolled, RPW leads the severely infested host tree to collapse and eventually die. The symbiotic associations with microorganisms and RPW in their gut may help their host insects’ establishment, development, nutrition assimilation, and survival. The objective of this research was the molecular characterization of the microbiome of RPW. In this study, the microbiome was compared among different tissues in females and males of RPW of three different morphs and larvae collected from date palm plantations in the Kingdom of Bahrain. A 251-bp segment of bacterial 16S rRNA was amplified by PCR, sequenced, and processed using the bioinformatics platform QIIME2. One ASV, corresponding to the obligate weevil symbiont Nardonella, predominated in adult female samples, constituting 56 ± 7% of total reads, but was less dominant in male samples (12 ± 3%) and larval samples (2.6 ± 1.9%). For females, samples that included reproductive tissues were almost entirely composed of Nardonella (88% - 99%). When Nardonella was excluded from analyses, there were no differences between adult females and adult males, but larval samples were more species-rich and differed in microbial composition from adults. There were no consistent differences in the microbiomes among morphs. Several specimens showed evidence of infection with host-specific strains of Spiroplasma-like members of the Entomoplasmatales, which are often pathogens or vertically transmitted symbionts. Such close microbial associates deserve additional attention as potential routes to control this destructive date palm pest.
基金Supported by the Focus on Research and Transformation Projects of Qinghai Province,No.2018-SF-113.
文摘BACKGROUND Acanthosis nigricans(AN),Leser–Trélat sign,and tripe palm are all skin diseases.To date,reports of these appearing as a paraneoplastic syndrome in a gastric cancer patient are quite rare.CASE SUMMARY We report the case of a 61-year-old man with darkened skin color in the face and torso with no obvious inducement after 1 year of treatment for Riehl’s melanosis.He had 40 brown maculopapular eruptions on his face and the top of his head with obvious itching.Papillary wart-like hyperkeratosis with dark brown pigmentation was also observed on both sides of the areola.He had papillomalike lesions on the face,around the orbit,and on the neck.His bilateral palms had small,smooth,papillary projections with millet-like appearance.Histopathological examination of the skin showed that the patient was suffering from AN,tripe palms,and Leser–Trélat sign.Gastroscopy showed the patient’s cardia was affected,and pathological biopsy revealed that he had moderate-to-poorly differentiated adenocarcinoma.Computed tomography test results showed that his cardia wall had thickened.Based on these histological and skin characteristics,the patient was diagnosed with gastric cancer with AN,tripe palms,and Leser–Trélat sign.CONCLUSION Researchers should follow up on patients with malignant AN,Leser–Trélat sign,and tripe palms.
文摘This paper summarizes our studies on metal and metalloid uptake by the date palm, Phoenix dactylifera L., a tree of considerable importance in arid regions. The typical concentrations of 17 elements in the date palm are summarized and compared with existing data in the scientific literature. The role and toxicity of these elements are considered. Issues encountered by us during sample collection, pre-treatment and chemical analysis are described. Future studies are suggested.
文摘The wax palm (Ceroxylon echinulatum) and palm heart (Prestoea acuminata) are key elements in Andean natural forests. This ecosystem is threatened by deforestation and habitat degradation, thus, it is vital to explore the impact of anthropogenic activities on the ecological structure and preferences of these species in order to develop proper conservation strategies. Fifty-seven 400 m2 plots were established in two forest areas, a disturbed forest (n = 30 plots) and an undisturbed forest (n = 27 plots) in the Ecuadorean Andes. Nine micro-environmental variables and the number of individuals of C. echinulatum and P. acuminata in five size classes were recorded in each plot. Logistic regression models helped identify environmental variables that influence the establishment of the species. Results showed that different micro-environmental variables determined the presence of different size classes. Both species were benefitted by the environmental conditions of the disturbed forest. Light availability was important for the establishment of both species, especially for the canopy species (C. echinulatum). This palm was negatively affected by the variable “fallen wood”, while P. acuminata was negatively affected mainly by the steepness of the terrain. The environmental variables for the successful establishment of the studied species that were identified by this study provide clues for the sustainable management of C. echinulatum and P. acuminata in Andean forests.
