In recent years, in response to the continuously rising demands of agricultural development, corn, as a key staple crop in China, plays an indispensable role in ensuring national food security. This study comprehensively evaluates the growth characteristics of various corn varieties and explores the practical benefits of high-yield cultivation strategies. The results show that a reasonable combination of corn varieties, scientific water and fertilizer management, and efficient pest and disease control measures can significantly increase corn yield. The findings of this study are crucial for accelerating the advancement of the corn industry in Nidang Town and its surrounding areas, while also providing valuable experience and technical support for achieving high-yield corn cultivation in similar regions.

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Cryopreservation of spermatozoa is of strategic importance in aquaculture breeding, large-scale seed production, and the conservation of endangered species. While research on sperm cryopreservation in marine mollusks lags behind that of livestock and fish species, significant progress has been made in recent years, particularly for key economically valuable species such as oysters, mussels, scallops, pearl oysters, clams, and abalones. This review systematically addresses four key technical aspects of sperm cryopreservation in bivalves and gastropods: (1) optimization of extender formulations; (2) selection of cryoprotectants; (3) regulation of cooling rates during the freezing process; and (4) thawing temperature control. Existing research has demonstrated that a combination of physiological traits, environmental factors, and cryopreservation protocols influences sperm quality. However, critical knowledge gaps remain in understanding marine mollusk sperm cryopreservation. This article synthesizes recent advancements and offers theoretical and practical frameworks for standardizing cryopreservation protocols, aiming to enhance post-thaw sperm viability and promote sustainable management of molluscan genetic resources.

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To investigate the prevalence and influencing factors of Early Childhood Caries (ECC) in Longgui Street in Baiyun District of Guangzhou and establish a prediction model to establish a basis for the overall diagnosis and prevention of ECC. Seven kindergartens were randomly selected from seven administrative villages on Longgui Street, and more than 300 kindergartens were needed. A total of 1,096 preschool children were included. The questionnaires were distributed to parents to investigate the oral health behavior and medical treatment behavior of the tested children and the oral health knowledge behavior of the tested parents, and the results were analyzed differently to establish a prediction model. The incidence of dental caries in 1096 preschool children was 18.6%, with age being a risk factor for dental caries (p<0.05, OR>1); only child status being a protective factor for dental caries (p<0.05, OR<1); family income level being a protective factor for dental caries (p<0.05, OR<1); chewing food-feeding children being a risk factor for dental caries (p<0.05, OR>1); starting brushing time being a protective factor for dental caries (p<0.05, OR<1); and toothache informing family members that it is a risk factor for dental caries (p<0.05, OR>1), but this factor is not suitable as a predictive factor because, in many cases, children who inform their parents that they already have dental caries disease. Parents' awareness of whether bacteria can cause gum inflammation and dental caries plays an important role in their oral health knowledge and attitudes. Conclusion: The prevalence of dental caries among preschool children in Longgui Street of Baiyun District is lower than the national level, indicating that remarkable achievements have been made in the prevention of dental caries among preschool children in Longgui Street. Dental caries in preschool children on Longgui Street are closely related to children's age, whether they are only children, parents' education level, parents' oral knowledge, beliefs and behaviors, and children's bad oral behaviors. Oral health behaviors should be cultivated as early as possible, and some aspects of traditional feeding habits should be abandoned.

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The ocean covers more than 70% of the Earth's surface and is an important part of the global life support system. However, in recent years, due to factors such as overfishing, marine pollution, and climate change, the marine ecosystem has been under unprecedented pressure, and there is a serious trend of in fishery resources. This study focuses on the impact of marine conservation on the sustainable development of fisheries, exploring synergistic effects with green chemical technology. By analyzing the relationship between marine ecosystem services and fishery resources, it reveals the negative impacts of overfishing and pollution on fisheries and ecosystems, emphasizing the necessity of conservation measures. The study indicates that green chemical technology significantly reduces pollution from fishery activities to the marine environment through some means such as developing friendly fishing nets, degradable materials, and efficient wastewater treatment systems, providing technical support for the recovery of fishery resources and so on.

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