Figs (Moracea: Ficus) and fig wasps (Hymenoptera: Chlocloids: Agaonideae) depend on each other to complete their reproduction. Monoecious fig species and their pollinating wasps are in conflict over the use of fig ov...Figs (Moracea: Ficus) and fig wasps (Hymenoptera: Chlocloids: Agaonideae) depend on each other to complete their reproduction. Monoecious fig species and their pollinating wasps are in conflict over the use of fig ovaries which can either produce one seed or one wasp. From observation on Ficus virens Ait., we showed that female flowers with outer layer of ovaries (near to the wall of syconium) had no significant difference from that with inner and interval layer of ovaries (near to the syconium cavity), in which most seeds and wasps were produced. This meant that fig tree provided the same potential resource for seed and wasps production. Observation indicated that there was usually only one foundress in syconium at female flower phase and no com- petition pollinators. Measurement of the style length of female flowers and the ovipositor of pollinators indicated that most ovaries could be reached by pollinator’s ovipositor. However, at the male flower phase, production of seeds was significantly more than that of wasps including non-pollinating wasps but there was no significant difference between seed and pollinating wasp production when without non-pollinating wasps produced. This result indicated that non-pollinating wasps competed ovaries not with seeds but with pollinating wasps for ovipositing. Bagged experiment showed that the sampling fig species was not self-sterile which was important for figs and wasps to survive bad season. Seed production in self-pollinated figs was not significantly different from total wasps in- cluding non-pollinating ones. This might be related with the weaker competition among wasps since bagged figs were not easy to reach by wasps from outside.展开更多
This article deals with a phenomenon that can be frequently observed in Chinese college learners writing and speaking—the overuse of an all-purpose verb:make.This overproduction can be broadly classified into two typ...This article deals with a phenomenon that can be frequently observed in Chinese college learners writing and speaking—the overuse of an all-purpose verb:make.This overproduction can be broadly classified into two types:make+noun+to do and make+object+complement.The former can be explained by the morphological difference between Chinese and English.In Chi nese,the word category is very flexible depending on the context.By contrast,in English word category can be changed by affixing.For the overproduction of the structure:make+object+complement,three contributing factors have been identified.Firstly positive inter-language transfer is one of them.The similarity between the causative construction in Chinese“shi+object+complement and the counterpart in English“make+object+complement”leads to the overproduction.Secondly exam-taking strategies tempt Chinese students to adopt“make+object+complement”to avoid making mistakes in the exam.Finally,for lack of causative verbs stocks in Chinese,Chinese college English learners avoid using other causative verbs in the realization of causative construction in their writing and speaking in English.展开更多
The poor performance of the agricultural sector as reflected in high prices of food stuffs as well as huge importation of food has been a major concern to many governments in Africa. Agriculture remains the backbone o...The poor performance of the agricultural sector as reflected in high prices of food stuffs as well as huge importation of food has been a major concern to many governments in Africa. Agriculture remains the backbone of Ghana＇s economy and women who constitute about 70% to 80% of farm labour face discrimination in terms of means of production such as land. The purpose of this study is to assess the impact of women＇s land rights on food production in the Brong-Ahafo region which is Ghana＇s food basket. Several land reforms have been instituted to ensure equitable access to land in order to enhance food production, yet the study reveals that many women have limited or no access to land and experience insecurity of tenure, which affects their farming methods, choice of crops grown, and production levels, consequently, resulting in low incomes and poverty. Relevant Primary Rate Access （RPRA） tools were used to gather data. The data were analyzed through descriptive statistics using Statistic Package for Social Science （SPSS） and Microsoft soRwares and presented into percentages, tabulation, and graphics. The research also revealed that the lack of awareness and education on land reforms and policies coupled with escalating land prices and complicated land transaction method are the major challenges to women＇s access and security over land. The study recommends the decentralization of the land title registration process, gender mainstreaming in the land title registration process, and intensification of advocacy on land rights, among others as crucial to improve women＇s access, control, and security over land for agricultural purposes展开更多
基金Supported by the Knowledge Innovation Research Program,Chinese Academy of Sciences (KSCX2-SW-105)
文摘Figs (Moracea: Ficus) and fig wasps (Hymenoptera: Chlocloids: Agaonideae) depend on each other to complete their reproduction. Monoecious fig species and their pollinating wasps are in conflict over the use of fig ovaries which can either produce one seed or one wasp. From observation on Ficus virens Ait., we showed that female flowers with outer layer of ovaries (near to the wall of syconium) had no significant difference from that with inner and interval layer of ovaries (near to the syconium cavity), in which most seeds and wasps were produced. This meant that fig tree provided the same potential resource for seed and wasps production. Observation indicated that there was usually only one foundress in syconium at female flower phase and no com- petition pollinators. Measurement of the style length of female flowers and the ovipositor of pollinators indicated that most ovaries could be reached by pollinator’s ovipositor. However, at the male flower phase, production of seeds was significantly more than that of wasps including non-pollinating wasps but there was no significant difference between seed and pollinating wasp production when without non-pollinating wasps produced. This result indicated that non-pollinating wasps competed ovaries not with seeds but with pollinating wasps for ovipositing. Bagged experiment showed that the sampling fig species was not self-sterile which was important for figs and wasps to survive bad season. Seed production in self-pollinated figs was not significantly different from total wasps in- cluding non-pollinating ones. This might be related with the weaker competition among wasps since bagged figs were not easy to reach by wasps from outside.
文摘This article deals with a phenomenon that can be frequently observed in Chinese college learners writing and speaking—the overuse of an all-purpose verb:make.This overproduction can be broadly classified into two types:make+noun+to do and make+object+complement.The former can be explained by the morphological difference between Chinese and English.In Chi nese,the word category is very flexible depending on the context.By contrast,in English word category can be changed by affixing.For the overproduction of the structure:make+object+complement,three contributing factors have been identified.Firstly positive inter-language transfer is one of them.The similarity between the causative construction in Chinese“shi+object+complement and the counterpart in English“make+object+complement”leads to the overproduction.Secondly exam-taking strategies tempt Chinese students to adopt“make+object+complement”to avoid making mistakes in the exam.Finally,for lack of causative verbs stocks in Chinese,Chinese college English learners avoid using other causative verbs in the realization of causative construction in their writing and speaking in English.
文摘The poor performance of the agricultural sector as reflected in high prices of food stuffs as well as huge importation of food has been a major concern to many governments in Africa. Agriculture remains the backbone of Ghana＇s economy and women who constitute about 70% to 80% of farm labour face discrimination in terms of means of production such as land. The purpose of this study is to assess the impact of women＇s land rights on food production in the Brong-Ahafo region which is Ghana＇s food basket. Several land reforms have been instituted to ensure equitable access to land in order to enhance food production, yet the study reveals that many women have limited or no access to land and experience insecurity of tenure, which affects their farming methods, choice of crops grown, and production levels, consequently, resulting in low incomes and poverty. Relevant Primary Rate Access （RPRA） tools were used to gather data. The data were analyzed through descriptive statistics using Statistic Package for Social Science （SPSS） and Microsoft soRwares and presented into percentages, tabulation, and graphics. The research also revealed that the lack of awareness and education on land reforms and policies coupled with escalating land prices and complicated land transaction method are the major challenges to women＇s access and security over land. The study recommends the decentralization of the land title registration process, gender mainstreaming in the land title registration process, and intensification of advocacy on land rights, among others as crucial to improve women＇s access, control, and security over land for agricultural purposes
