Vetiver grass (</span><i><span style="font-family:Verdana;">Vetiveria</span></i> <i><span style="font-family:Verdana;">zizanioides</span></i>&l...Vetiver grass (</span><i><span style="font-family:Verdana;">Vetiveria</span></i> <i><span style="font-family:Verdana;">zizanioides</span></i><span style="font-family:Verdana;"> L.) is widely used for soil and water conservation, and land management. In practice, all vetiver seedlings are propagated via ramets or tillers, which cannot meet the market demand and would also destroy the original habitat. Most</span><span style="color:red;"> </span><span style="font-family:Verdana;">vetiver genotypes flower but do not produce seeds. A wild ecotype of vetiver grass originated in southern China is fertile, but the rate of seed germination is very low. This study aimed to develop a novel method to improve its seed germination and seedling establishment. In the field, the inflorescences of wild vetiver were wrapped using a transparent plastic bag with a pot containing wet soils. The effects of inflorescence bagging and Tween 80 application on seed germination and seedling growth were examined. The results showed that seed development was characterized by low seed setting rate (19.2%), uneven maturity time, easy shedding (more than 95% of spikelets shed off 20 days after flowering), therefore difficult harvest of viable seeds. Bagging the inflorescence with moist soils in pot ensured the mature seeds falling onto the nursery soil surface and absorbing water for germination while the immature seeds continued to grow on the inflorescence. Bigging not only improved seed development and maturity, saved the procedure of seed collection and storage, but also provided a humid micro-environment for seed germination and seedling growth. Tween 80 as a surfactant promoted seed water absorption, germination and seedling growth. This simple and novel method has integrated the procedures of seed collection, storage, germination and seedling establishment, and enables </span></span><span style="font-family:Verdana;">the </span><span style="font-family:Verdana;">produc</span><span style="font-family:Verdana;">tion</span><span style="font-family:""> </span><span style="font-family:Verdana;">of </span><span style="font-family:Verdana;">a large </span><span style="font-family:Verdana;">number</span><span style="font-family:Verdana;"> of healthy seedlings. The possible reasons for the degeneration and disappearance of the original population were also discussed from the perspective of the disadvantages of vetiver propagation.展开更多
Objective: To understand the status and characteristics of hepatitis B, hepatitis C, syphilis and HIV antibody screening in one dental hospital, and to provide scientific basis for the prevention and treatment of comm...Objective: To understand the status and characteristics of hepatitis B, hepatitis C, syphilis and HIV antibody screening in one dental hospital, and to provide scientific basis for the prevention and treatment of common infectious diseases in dental medical institutions. Methods: Collect all samples of patients screened for hepatitis B, hepatitis C, syphilis and HIV from one stomatological hospital in 2018-2019, and make statistics on the distribution of common infectious diseases among patients in stomatology, such as age, gender, type of treatment, department of treatment, etc. Results: The positive rate of hepatitis B was 2.27%, 39.42% in males and 60.58% in females. It was mainly detected by outpatient department, accounting for 87.5%. The age was concentrated in 30 - 60 years old, accounting for 77.88%. It was mainly distributed in oral and maxillofacial surgery, orthodontics and implant, accounting for 82.69%. The positive rate of hepatitis C was 0.1%, 33.33% in men and 66.67% in women. It was mainly detected by outpatient department, accounting for 83.33%. The age is concentrated in 20 - 50 years old, accounting for 100%. It is mainly distributed in oral and maxillofacial surgery, orthodontics and implant, accounting for 100%. The positive rate of syphilis was 0.18%, 33.33% for men and 66.67% for women. It was mainly detected by outpatient department, accounting for 83.33%. The age is concentrated in 30 - 50 years old, accounting for 100%. It was mainly distributed in oral and maxillofacial surgery, orthodontics and implant, accounting for 83.33%. HIV was not detected. Conclusion: The positive detection rate of common infectious diseases in the stomatological hospitals is generally lower than the average level. It is mainly distributed in the department of implant, oral and maxillofacial surgery and orthodontics. The highest positive detection rate of common infectious diseases is hepatitis B which is 2.27%, and the lowest is HIV which is 0.展开更多
文摘Vetiver grass (</span><i><span style="font-family:Verdana;">Vetiveria</span></i> <i><span style="font-family:Verdana;">zizanioides</span></i><span style="font-family:Verdana;"> L.) is widely used for soil and water conservation, and land management. In practice, all vetiver seedlings are propagated via ramets or tillers, which cannot meet the market demand and would also destroy the original habitat. Most</span><span style="color:red;"> </span><span style="font-family:Verdana;">vetiver genotypes flower but do not produce seeds. A wild ecotype of vetiver grass originated in southern China is fertile, but the rate of seed germination is very low. This study aimed to develop a novel method to improve its seed germination and seedling establishment. In the field, the inflorescences of wild vetiver were wrapped using a transparent plastic bag with a pot containing wet soils. The effects of inflorescence bagging and Tween 80 application on seed germination and seedling growth were examined. The results showed that seed development was characterized by low seed setting rate (19.2%), uneven maturity time, easy shedding (more than 95% of spikelets shed off 20 days after flowering), therefore difficult harvest of viable seeds. Bagging the inflorescence with moist soils in pot ensured the mature seeds falling onto the nursery soil surface and absorbing water for germination while the immature seeds continued to grow on the inflorescence. Bigging not only improved seed development and maturity, saved the procedure of seed collection and storage, but also provided a humid micro-environment for seed germination and seedling growth. Tween 80 as a surfactant promoted seed water absorption, germination and seedling growth. This simple and novel method has integrated the procedures of seed collection, storage, germination and seedling establishment, and enables </span></span><span style="font-family:Verdana;">the </span><span style="font-family:Verdana;">produc</span><span style="font-family:Verdana;">tion</span><span style="font-family:""> </span><span style="font-family:Verdana;">of </span><span style="font-family:Verdana;">a large </span><span style="font-family:Verdana;">number</span><span style="font-family:Verdana;"> of healthy seedlings. The possible reasons for the degeneration and disappearance of the original population were also discussed from the perspective of the disadvantages of vetiver propagation.
文摘Objective: To understand the status and characteristics of hepatitis B, hepatitis C, syphilis and HIV antibody screening in one dental hospital, and to provide scientific basis for the prevention and treatment of common infectious diseases in dental medical institutions. Methods: Collect all samples of patients screened for hepatitis B, hepatitis C, syphilis and HIV from one stomatological hospital in 2018-2019, and make statistics on the distribution of common infectious diseases among patients in stomatology, such as age, gender, type of treatment, department of treatment, etc. Results: The positive rate of hepatitis B was 2.27%, 39.42% in males and 60.58% in females. It was mainly detected by outpatient department, accounting for 87.5%. The age was concentrated in 30 - 60 years old, accounting for 77.88%. It was mainly distributed in oral and maxillofacial surgery, orthodontics and implant, accounting for 82.69%. The positive rate of hepatitis C was 0.1%, 33.33% in men and 66.67% in women. It was mainly detected by outpatient department, accounting for 83.33%. The age is concentrated in 20 - 50 years old, accounting for 100%. It is mainly distributed in oral and maxillofacial surgery, orthodontics and implant, accounting for 100%. The positive rate of syphilis was 0.18%, 33.33% for men and 66.67% for women. It was mainly detected by outpatient department, accounting for 83.33%. The age is concentrated in 30 - 50 years old, accounting for 100%. It was mainly distributed in oral and maxillofacial surgery, orthodontics and implant, accounting for 83.33%. HIV was not detected. Conclusion: The positive detection rate of common infectious diseases in the stomatological hospitals is generally lower than the average level. It is mainly distributed in the department of implant, oral and maxillofacial surgery and orthodontics. The highest positive detection rate of common infectious diseases is hepatitis B which is 2.27%, and the lowest is HIV which is 0.
