The volatile constituents of the essential oil of Hymenocrater longiflorus Benth. growing wild in Kurdistan-Iran were investigated using the GC and GC/MS techniques. Fifteen compounds, representing twenty (97.03%) of ...The volatile constituents of the essential oil of Hymenocrater longiflorus Benth. growing wild in Kurdistan-Iran were investigated using the GC and GC/MS techniques. Fifteen compounds, representing twenty (97.03%) of the total oil were identified. The main components were: α- Pinene (22.47%), β-Caryophyllene (18.05%), β- Eudesmol (14.92%), α-Copaene (9.84%), γ-Elemene (6.79%), δ-Cadine-ne (6.13%), (–)Bornyl acetate (5.61%), α-Amorphene (3.84%), α-Fen- chyl acetate (2.35%) and β-Pinene (2.07%). Some of the physicochemical properties like the logarithm of calculated Octanol-Water partitioning coefficients (log Kow), total biodegradation and (TBd in mol/h and gr./h), water solubility (Sw, mg.L-1 at 25oC) and median lethal concentration 50 (LC50) were calculated for the 15 com- ponents of Hymenocrater longiflorus Benth.展开更多
为探究敌敌畏、乐果对不同龄期柞蚕幼虫的急性毒性,采用食下毒叶法喂食不同龄期的柞蚕幼虫,连续观察96 h,分时间段测定敌敌畏、乐果对柞蚕幼虫的半数致死浓度(LC_(50));通过熏蒸毒性试验,连续观察72 h,记录对不同龄期柞蚕幼虫的熏蒸毒性...为探究敌敌畏、乐果对不同龄期柞蚕幼虫的急性毒性,采用食下毒叶法喂食不同龄期的柞蚕幼虫,连续观察96 h,分时间段测定敌敌畏、乐果对柞蚕幼虫的半数致死浓度(LC_(50));通过熏蒸毒性试验,连续观察72 h,记录对不同龄期柞蚕幼虫的熏蒸毒性,利用SPSS软件,建立模型方程,计算出敌敌畏、乐果对不同龄期柞蚕幼虫的LC_(50)及置信区间。结果显示,2种农药毒性相比,敌敌畏高于乐果。敌敌畏对5龄柞蚕幼虫的24 h LC_(50)最高达到277.159 mg/L,对1龄柞蚕幼虫的96 h LC_(50)最低为0.161 mg/L,对1、2龄柞蚕幼虫的毒性为剧毒,对其它龄期柞蚕幼虫的毒性为高毒;乐果对5龄柞蚕幼虫的24 h LC_(50)最高达到391 858.000 mg/L,对1龄柞蚕幼虫的96 h LC_(50)最低为0.652 mg/L,对1龄柞蚕幼虫的毒性为剧毒,对其它龄期柞蚕幼虫的毒性为中毒或低毒。敌敌畏对柞蚕幼虫的熏蒸毒性为高风险,乐果对柞蚕幼虫也有一定的熏蒸毒性。展开更多
文摘The volatile constituents of the essential oil of Hymenocrater longiflorus Benth. growing wild in Kurdistan-Iran were investigated using the GC and GC/MS techniques. Fifteen compounds, representing twenty (97.03%) of the total oil were identified. The main components were: α- Pinene (22.47%), β-Caryophyllene (18.05%), β- Eudesmol (14.92%), α-Copaene (9.84%), γ-Elemene (6.79%), δ-Cadine-ne (6.13%), (–)Bornyl acetate (5.61%), α-Amorphene (3.84%), α-Fen- chyl acetate (2.35%) and β-Pinene (2.07%). Some of the physicochemical properties like the logarithm of calculated Octanol-Water partitioning coefficients (log Kow), total biodegradation and (TBd in mol/h and gr./h), water solubility (Sw, mg.L-1 at 25oC) and median lethal concentration 50 (LC50) were calculated for the 15 com- ponents of Hymenocrater longiflorus Benth.
文摘为探究敌敌畏、乐果对不同龄期柞蚕幼虫的急性毒性,采用食下毒叶法喂食不同龄期的柞蚕幼虫,连续观察96 h,分时间段测定敌敌畏、乐果对柞蚕幼虫的半数致死浓度(LC_(50));通过熏蒸毒性试验,连续观察72 h,记录对不同龄期柞蚕幼虫的熏蒸毒性,利用SPSS软件,建立模型方程,计算出敌敌畏、乐果对不同龄期柞蚕幼虫的LC_(50)及置信区间。结果显示,2种农药毒性相比,敌敌畏高于乐果。敌敌畏对5龄柞蚕幼虫的24 h LC_(50)最高达到277.159 mg/L,对1龄柞蚕幼虫的96 h LC_(50)最低为0.161 mg/L,对1、2龄柞蚕幼虫的毒性为剧毒,对其它龄期柞蚕幼虫的毒性为高毒;乐果对5龄柞蚕幼虫的24 h LC_(50)最高达到391 858.000 mg/L,对1龄柞蚕幼虫的96 h LC_(50)最低为0.652 mg/L,对1龄柞蚕幼虫的毒性为剧毒,对其它龄期柞蚕幼虫的毒性为中毒或低毒。敌敌畏对柞蚕幼虫的熏蒸毒性为高风险,乐果对柞蚕幼虫也有一定的熏蒸毒性。
