in this paper, the chemical functionalization of carboxylate multi-walled carbon nanotubes by methyl (triphenyl phosphoranylidene) acetate have been investigated. phosphorus ylides are important compound in organic chemistry. at first, methyl (triphenyl phosphoranylidene) acetate, synthesized from salt metod in two steps: the formation of the phosphonium salt and the deprotonation of the latter...

background and objectives:gamma-irradiation is used vastly for both decontamination and sterilization of natural products; but these high-energy rays can affect heat-sensitive essential oils. methods: the oleo-gum-resin of boswellia carterii (burseraceae) was sterilized by γ-irradiation at dose 30 kgy. the essential oils obtained by hydrodistillation of non-irradiated boswellia (nib) and irradi...

The catalytic potential of tin(II)acetate, tin(IV)acetate, dibutyltin-bis-acetate and dioctyl tin-bis-acetate was compared based on polymerizations L-lactide conducted in bulk at 160 or 130°C. With SnAc2 low-Lac/Cat ratios (15/1–50/1) were studied linear chains having one acetate carboxyl end group almost free cyclics obtained. Higher monomer/catalyst lower temperatures favored formation cycles...

inh dầu gừng là một trong những tinh quý do có công dụng chữa bệnh buồn nôn, chống say tàu xe, kháng oxi hóa, khuẩn và viêm. Trong nghiên cứu này, thành phần hóa học từ căn hành Zingiber officinale Roscoe trồng tại Phú Yên Bình Dương lần đầu tiên được bố. Các thông số chưng cất lôi cuốn hơi nước tối ưu bao gồm thời gian ly trích (06 giờ) tỉ lệ nguyên liệu: (1:3 g/ml). Thành phân tích bằng phươn...

background & aim: sexual health is an essential element of quality of life, affecting both physical and psychological domains. hormones used in contraceptive methods have contradictory effects on sexual function. in this study, we aimed to compare sexual function in women using combined oral contraceptives (coc) and depot medroxyprogesterone acetate (dmpa), referred to healthcare centers affili...