In recirculating aquaculture systems(RASs),the effective treatment of aquaculture tailwater is essential to maintain the health of the RAS.This study investigated the optimal time and method for tailwater treatment du...In recirculating aquaculture systems(RASs),the effective treatment of aquaculture tailwater is essential to maintain the health of the RAS.This study investigated the optimal time and method for tailwater treatment during three periods of the aquaculture of the Litopenaeus vannamei:nursery(0–26 d),middle(27–57 d),and later(57–104 d).The variation of several water parameters during the dissolution of total suspended solid(TSS)in tailwater,applied with the effects of ozone on the microorganism and water quality parameters were investigated.Results showed that the TSS concentrations in tailwater decreased with time,although not significantly(P>0.05),whereas total ammonia nitrogen(TAN),nitrite(NO-2-N),and nitrate(NO_(3)^(-)-N)increased significantly(P<0.05).Therefore,TSS should be removed from the tailwater as early as possible,being most optimal within 4 h.Ozone removed 38.24%–48.95%of TSS,17.78%–90.14%of TAN,and 87.50%–98.90%of NO-2-N after 4 h of treatment.However,it resulted in the significant accumulation of NO_(3)^(-)-N.Moreover,the total number of Vibrio and bacterial counts in aquaculture tailwater was reduced completely by ozone within 4 h.Thus,these results provided technical details and data support for the effective treatment of tailwater from shrimp RAS.展开更多
Background:To investigate and analyze the hospitalization costs of inpatients with primary acute angle closure glaucoma(PACG),and to explores the influencing factors of hospitalization cost and to provide reference fo...Background:To investigate and analyze the hospitalization costs of inpatients with primary acute angle closure glaucoma(PACG),and to explores the influencing factors of hospitalization cost and to provide reference for specialized hospitals to carry out clinical pathways.Methods:The first page diagnostic data of PACG patients’medical records were collected,and an Excel database was established according to the International Classification of Diseases(ICD-10)code.Statistical analysis of hospitalization data was performed using SPSS 17.0 software.Results:Hospitalization days and clinical pathway which affect the change of the hospitalization cost(P<0.001).Conclusions:Hospitalization day is an important factor affecting the hospitalization cost,reducing unnecessary hospitalization time can control the increase of hospitalization cost.展开更多
基金Supported by the National Key R&D Program of China(No.2019YFD0900502)。
文摘In recirculating aquaculture systems(RASs),the effective treatment of aquaculture tailwater is essential to maintain the health of the RAS.This study investigated the optimal time and method for tailwater treatment during three periods of the aquaculture of the Litopenaeus vannamei:nursery(0–26 d),middle(27–57 d),and later(57–104 d).The variation of several water parameters during the dissolution of total suspended solid(TSS)in tailwater,applied with the effects of ozone on the microorganism and water quality parameters were investigated.Results showed that the TSS concentrations in tailwater decreased with time,although not significantly(P>0.05),whereas total ammonia nitrogen(TAN),nitrite(NO-2-N),and nitrate(NO_(3)^(-)-N)increased significantly(P<0.05).Therefore,TSS should be removed from the tailwater as early as possible,being most optimal within 4 h.Ozone removed 38.24%–48.95%of TSS,17.78%–90.14%of TAN,and 87.50%–98.90%of NO-2-N after 4 h of treatment.However,it resulted in the significant accumulation of NO_(3)^(-)-N.Moreover,the total number of Vibrio and bacterial counts in aquaculture tailwater was reduced completely by ozone within 4 h.Thus,these results provided technical details and data support for the effective treatment of tailwater from shrimp RAS.
基金Guangdong Editorial Society of Science and Technology Periodicals fund project funding(No.201820).
文摘Background:To investigate and analyze the hospitalization costs of inpatients with primary acute angle closure glaucoma(PACG),and to explores the influencing factors of hospitalization cost and to provide reference for specialized hospitals to carry out clinical pathways.Methods:The first page diagnostic data of PACG patients’medical records were collected,and an Excel database was established according to the International Classification of Diseases(ICD-10)code.Statistical analysis of hospitalization data was performed using SPSS 17.0 software.Results:Hospitalization days and clinical pathway which affect the change of the hospitalization cost(P<0.001).Conclusions:Hospitalization day is an important factor affecting the hospitalization cost,reducing unnecessary hospitalization time can control the increase of hospitalization cost.
