Comparison of the volatiles composition between healthy and buprestid infected Juglans regia (Juglandaceae).

Meliboeus ohbayashii primoriensis (Coleoptera: Buprestidae) is an important pest of the walnut tree Juglans regia (Juglandaceae), but the volatiles mediating this plant–herbivore interaction are unknown. In this study, volatiles emitted by healthy J. regia and by plants infested with M. ohbayashii primoriensis (Coleoptera: Buprestidae) were obtained by a dynamic headspace method and analyzed by gas chromatography-mass spectrometry (Shanxi, China). We identified 26 major compounds and compared the volatile composition of healthy and buprestid-infected J. regia. Green leaf volatiles were detected in all damaged plants, including the monoterpenoids β-phellandrene and (E)-β-ocimene, the sesquiterpenoids (-)-β-bourbonene, β-ylangene, and (E,E)-α-farnesene, the alcohols linalool, myrtenol, and (E)-(-)-pinocarveol, the ketones (E)-pinocamphone and (Z)-pinocamphone, and the ester methyl salicylate. The major volatiles detected in healthy plants were β-pinene (36.26 %), α-pinene (23.81 %), D-limonene (12.03 %), sabinene (8.63 %), and β-myrcene (4.35 %). The main volatiles from M. ohbayashii primoriensis larva-infested plants were β-pinene (37.82 %), α-pinene (20.36 %), D-limonene (14.71 %), germacrene D (5.24 %), sabinene (4.52 %), and β-phellandrene (3.80 %). These results enrich our understanding of volatiles of healthy plants and plants infested with M. ohbayashii primoriensis. Furthermore, they provide a theoretical basis and scientific foundation for integrated pest management and for effective ecologically sustainable pest control strategie

Changes of predominant species/biovars and sequence types of Brucellaisolates, Inner Mongolia, China

BACKGROUND: Human brucellosis incidence in China was divided into 3 stages, high incidence (1950-1960s), decline (1970-1980s) and re-emergence (1990-2000s). Human brucellosis has been reported in all the 32 provinces, of which Inner Mongolia has the highest prevalence, accounting for over 40% of the cases in China. To investigate the etiology alteration of human brucellosis in Inner Mongolia, the species, biovars and genotypes of 60 Brucella isolates from this province were analyzed. METHODS: Species and biovars of the Brucella strains isolated from outbreaks were determined based on classical identification procedures. Strains were genotyped by multi locus sequence typing (MLST). Sequences of 9 housekeeping genes were obtained and sequence types were defined. The distribution of species, biovars and sequence types (STs) among the three incidence stages were analyzed and compared. RESULTS: The three stages of high incidence, decline and re-emergence were predominated by B. melitensis biovar 2 and 3, B. abortus biovar 3, and B. melitensis biovar 1, respectively, implying changes in the predominant biovars. Genotyping by MLST revealed a total of 14 STs. Nine STs (from ST28 to ST36), accounting for 64.3% of all the STs, were newly defined and different from those observed in other countries. Different STs were distributed among the three stages. ST8 was the most common ST in 1950-1960s and 1990-2000s, while ST2 was the most common in 1970-1980s. CONCLUSIONS: The prevalence of biovars and sequence types of Brucella strains from Inner Mongolia has changed over time in the three stages. Compared with those from other countries, new sequence types of Brucella strains exist in China

Mixed Eucalyptus plantations in subtropical China enhance phosphorus accumulation and transformation in soil aggregates

IntroductionThe production of Eucalyptus, a principal economic tree genus in China, is faced with challenges related to soil phosphorus (P) limitations. In this study, we explore variations in phosphorus content, storage, and transformation in Eucalyptus forests. We hypothesize that mixed forests augment soil aggregate stability and P content and that microaggregates are pivotal in determining P differences between mixed and pure forests. Additionally, we posit that mixed forests foster P transformation, enhancing its efficacy in the soil. Current research on the distribution and transformation of soil total P (TP) and P fractions at the soil aggregate level is limited.MethodsIn this study, we selected soil from a Eucalyptus-Mytilaria laosensis Lecomte mixed forest, Eucalyptus-Erythrophleum fordii Oliv mixed forest, and pure Eucalyptus forest in Chongzuo County, Guangxi, China, as the research objects. Using a dry-sieving method, we divided the soil collected in situ from the 0–40 cm layer into aggregates of >2, 1–2, 0.25–1, and <0.25 mm particle sizes, measured the TP and P fractions (resin-extractable inorganic P, bicarbonate-extractable inorganic P, bicarbonate-extractable organic P, sodium hydroxide-extractable inorganic P, sodium hydroxide-extractable organic P, dilute hydrochloric acid-extractable P, concentrated hydrochloric acid extractable inorganic P, concentrated hydrochloric acid-extractable organic P and residue-P) in different aggregates, and used redundancy analysis and PLS SEM to reveal key factors affecting soil P accumulation and transformation.ResultsThe results showed that compared to pure Eucalyptus forests, mixed Eucalyptus forests significantly enhanced the stability of soil aggregates and the content and storage of phosphorus, especially the Eucalyptus-Mytilaria laosensis mixed forest. The content of total soil phosphorus and its fractions decreased with increasing aggregate particle size, while the opposite trend was observed for stored P, with aggregates <0.25 mm being the main fraction influencing soil phosphorus accumulation. The transformation process of P fractions was primarily constrained by dissolution rates, mineralization rates, biological activity, including the action of microbes, fungi, and plant–root interactions, and other factors.DiscussionMixed forests increased the transformation of phosphorus in soil aggregates, effectivel enhancing the availability of soil phosphorus. In summary, this study provides important evidence for the systematic management of subtropical artificia Eucalyptus forests and the sustainable utilization of soil resources

Comparación de la composición de los volátiles de Juglans regia (Juglandaceae) sanos e infestadas por un escarabajo bupréstido

Meliboeus ohbayashii primoriensis (Coleoptera: Buprestidae) is an important pest of the walnut tree Juglans regia (Juglandaceae), but the volatiles mediating this plant–herbivore interaction are unknown. In this study, volatiles emitted by healthy J. regia and by plants infested with M. ohbayashii primoriensis (Coleoptera: Buprestidae) were obtained by a dynamic headspace method and analyzed by gas chromatography-mass spectrometry (Shanxi, China). We identified 26 major compounds and compared the volatile composition of healthy and buprestid-infected J. regia. Green leaf volatiles were detected in all damaged plants, including the monoterpenoids β-phellandrene and (E)-β-ocimene, the sesquiterpenoids (-)-β-bourbonene, β-ylangene, and (E,E)-α-farnesene, the alcohols linalool, myrtenol, and (E)-(-)-pinocarveol, the ketones (E)-pinocamphone and (Z)-pinocamphone, and the ester methyl salicylate. The major volatiles detected in healthy plants were β-pinene (36.26 %), α-pinene (23.81 %), D-limonene (12.03 %), sabinene (8.63 %), and β-myrcene (4.35 %). The main volatiles from M. ohbayashii primoriensis larva-infested plants were β-pinene (37.82 %), α-pinene (20.36 %), D-limonene (14.71 %), germacrene D (5.24 %), sabinene (4.52 %), and β-phellandrene (3.80 %). These results enrich our understanding of volatiles of healthy plants and plants infested with M. ohbayashii primoriensis. Furthermore, they provide a theoretical basis and scientific foundation for integrated pest management and for effective ecologically sustainable pest control strategies.Meliboeus ohbayashii primoriensis (Coleoptera: Buprestidae) es una plaga importante del nogal Juglans regia (Juglandaceae), pero se desconocen los compuestos volátiles que median esta interacción planta-herbívoro. En este estudio, se obtuvieron los volátiles emitidos por plantas de J. regia tanto sanas como infestadas con M. ohbayashii primoriensis (Coleoptera: Buprestidae), mediante un método de espacio de cabeza dinámico y se analizaron por cromatografía de gases-espectrometría de masas (Shanxi, China). Se identificaron 26 compuestos principales y se comparó la composición volátil de J. regia sana e infectada con bupréstido. Se detectaron volátiles de hojas verdes en todas las plantas dañadas, incluidos los monoterpenoides β-felandreno y (E)-β-ocimeno, los sesquiterpenoides (-)-β-bourboneno, β-ylangeno y (E,E)-α-farnesano, los alcoholes linalool, mirtenol y (E)-(-)-pinocarveol, las cetonas (E)-pinocamfono y (Z)-pinocamfono, y el éster salicilato de metilo. Los principales volátiles detectados en plantas sanas fueron β-pineno (36,26 %), α-pineno (23,81 %), D-limoneno (12,03 %), sabineno (8,63 %) y β-mirceno (4,35 %). Los principales volátiles de las plantas infestadas de larvas de M. ohbayashii primoriensis fueron β-pineno (37,82 %), α-pineno (20,36 %), D-limoneno (14,71 %), germacreno D (5,24 %), sabineno (4,52 %), y β-felandreno (3,80 %). Estos resultados enriquecen nuestra comprensión de los volátiles de plantas sanas e infestadas con M. ohbayashii primoriensis. Además, proporcionan una base teórica y una científica para el manejo integrado de plagas y para estrategias efectivas, ecológicamente sostenibles, para el control de plagas

Net Primary Productivity and Management Potential of Artificial Pinus tabulaeformis Forest in Shanxi Province

The dynamic variation of net primary productivity of artificial Pinus tabulaeformis forest was studied in Shanxi Province, and potential productivity of artificial forest was predicted to provide reference for improving quality of regional forest stand. The regression equation was established by using the stratification and harvesting method with the relative growth model. Cumulative method and Thornthwaite Memorial model was used to estimate the actual and potential productivity of the forest. The productivity of P. tabulaeformis forest increased with the increase of age and started decrease with the mature period. The actual productivity of P. tabulaeformis forest was 4.462 t/(ha•a); the contribution rate of trees was 72.17% of the total productivity, and with the increase of age, the total biomass increased but productivity decreased at late near-mature forest; the contribution rate of herb layer was 21.16% in the young forest stage, and then decreased gradually. On the contrary, the contribution rate of shrub layer increased gradually, and the contribution rate of the grassland was more than that of the herb layer, so as the key period of structural management; the average potential productivity of forest was 8.422 t/(ha•a), and the potential space of P. tabulaeformis was at least 32% in Shanxi Province. In conclusion, the potential space of productivity of P. tabulaeformis was at least 32%, and the primary limiting factor of P. tabulaeformis forest productivity in Shanxi Province was rainfall

Characterization of the complete chloroplast genome of Phleum pratense L. cv. Minshan

Severe seed degradation of Phleum pratense L. cv. Minshan restricts its productivity and promotion, the chloroplast genome and evolutionary relationship analysis of Minshan could provide inheritance reasons on seed degradation and fundamental genetic reference for its molecular breeding and biological research. Its chloroplast genome was 134,973 bp in length, containing a pair of inverted repeated regions (42,726 bp) which were separated by a large single copy region of 79,473 bp, and a small single copy region of 12,774 bp. Moreover, a total of 114 functional genes were annotated, including 79 mRNA, 32 tRNA genes, and 5 rRNA genes. The phylogenetic relationships of 25 species indicated that Minshan was closely related to Avena damascene

Detecting compromised email accounts via login behavior characterization

Abstract The illegal use of compromised email accounts by adversaries can have severe consequences for enterprises and society. Detecting compromised email accounts is more challenging than in the social network field, where email accounts have only a few interaction events (sending and receiving). To address the issue of insufficient features, we propose a novel approach to detecting compromised accounts by combining time zone differences and alternate logins to identify abnormal behavior. Based on this approach, we propose a compromised email account detection framework that relies on widely available and less sensitive login logs and does not require labels. Our framework characterizes login behaviors to identify logins that do not belong to the account owner and outputs a list of account-subnet pairs ranked by their likelihood of having abnormal login relationships. This approach reduces the number of account-subnet pairs that need to be investigated and provides a reference for investigation priority. Our evaluation demonstrates that our method can detect most email accounts that have been accessed by disclosed malicious IP addresses and outperforms similar research. Additionally, our framework has the capability to uncover undisclosed malicious IP addresses

GRATITUDE ET BIEN-ÊTRE SOCIAL : MÉCANISMES EXPLICATIFS DES EFFETS DE LA GRATITUDE SUR LE BIEN-ÊTRE INDIVIDUEL ET COLLECTIF

La gratitude a été définie comme une émotion sociale agréable qui génère de nombreuses conséquences positives sur la santé physique, mentale et sociale par le biais d’une augmentation de la capacité à apprécier les expériences, à percevoir des bénéfices même en cas d’adversité, et à développer, maintenir et améliorer les relations sociales. Toutefois, loin d’être un état dont les effets ne bénéficieraient qu’à l’individu, la gratitude engendre également des effets bénéfiques pour autrui, notamment par le biais de son expression : l’expression de gratitude génère un sentiment d’utilité et de valeur sociale chez l’interlocuteur, augmentant par-là le bien-être psychologique. Au-delà du simple effet de contagion émotionnelle, la gratitude entraîne une amélioration réciproque des relations, ce qui favorise le maintien ou l’amélioration des relations sociales constructives, auxquelles le bien-être est étroitement lié. Les mécanismes explicatifs des liens entre gratitude et bien-être individuel et collectif sont présentés, ainsi que des perspectives de recherche et d’applications pratiques.Gratitude has been defined as a social emotion which generates numerous positive consequences on physical, mental and social well-being through the development of the ability to savor experiences, to find benefits even when facing adversity, and to develop, maintain, and increase positive relationships. However, far from leading to a state in which the effects would only benefit the individual, gratitude generates beneficial effects for others as well. Expressing gratitude generates feelings of social utility and social worth which positively impact psychological well-being of the receiving party. Beyond emotional contagion, through which relatives benefit from others’ positive emotions, gratitude opens a pathway that nurtures mutual positive relationships, thereby ensuring maintenance or increased well-being. The present article explains the mechanisms through which gratitude positively impacts individual and collective well-being, and presents further research and practical avenues

Suppressing Cyclic Polymerization for Isoselective Synthesis of High-Molecular-Weight Linear Polylactide Catalyzed by Sodium/Potassium Sulfonamidate Complexes

A new sodium/potassium crown ether complex system with a series of bichelating sulfonamides as ligands was developed for the ring-opening polymerization (ROP) of <i>rac</i>-lactide. In this system, the side reaction of cyclic polymerization can be suppressed very well because of very different ROP rates initiated by BnOH and sulfonamide anion. The synthesis of high molecular weight linear polylactide with molecular weight high up to 107 kg/mol was successful. The best isoselectivity also can reach to a high value of <i>P</i>_m = 0.84. The NMR analysis of the reaction mixture of <i>rac</i>-lactide and complex <b>3</b> together with kinetic studies suggests the mechanism of ROP in the absence of alcohol is a coordination–insertion mechanism. After addition of BnOH, the ROP rate can increase remarkably due to the cooperation interaction of alcohol and complex <b>3</b>