Search results for "DDT"
showing 4 items of 24 documents
A time-course investigation of vitamin A levels and drug metabolizing enzyme activities in rats following a single treatment with prototypic polychlo…
1987
Xenobiotics previously characterized as selective inducers of drug-metabolizing enzymes were chosen to probe possible relationships between enzyme induction and vitamin A metabolism. Liver, kidney and serum retinol and retinyl palmitate levels were investigated in male Sprague--Dawley rats receiving a single i.p. injection of the polychlorinated biphenyls (PCBs), 2,2',5,5'-tetrachlorobiphenyl, 3,3',4,4'-tetrachlorobiphenyl or 2,2',4,4',5,5'-hexachlorobiphenyl (300 mumol/kg) or 1,1,1-trichloro-2,2-bis-(4-chlorophenyl)-ethane (DDT) (150 mumol/kg). While 2,2',5,5'-tetrachlorobiphenyl, a weak or non-inducer, and 2,2',4,4',5,5'-hexaclorobiphenyl and DDT, phenobarbital-type inducers of cytochrome…
Biofilmu veidojošo Staphylococcus epidermidis antibakteriālās rezistences un mecA gēna noteikšana
2017
Staphylococcus epidermidis baktērijas mūsdienās ir kļuvušas par visbiežāk izolētajiem un būtiskākajiem koagulāzes negatīvo stafilokoku pārstāvjiem nozokomiālajā vidē, jo, būdami dominējošie oportūnistiskie patogēni, tās izraisa ievērojamu skaitu ar medicīniskajām ierīcēm saistītu infekcijas slimību cilvēkiem ar novājinātu imūnsistēmu, kļūstot par nopietnu draudu sabiedrības veselībai. S. epidermidis patogenitāte izpaužas šo baktēriju spējā producēt biofilmas, kuras kalpo kā daudzfunkcionāls virulences un antibakteriālās rezistences faktors un padara šo patogēnu izraisītās slimības ļoti grūti ārstējamas, jo tiek atvieglota antibiotiku rezistences gēnu, tai skaitā SCCmec lokalizētā mecA gēna,…
From arsenic to DDT: Pesticides, Fascism and the invisibility of toxic risks in the early years of Francoist Spain (1939-1953)
2021
This paper reviews the way in which Spanish agriculture climbed onto the pesticide treadmill. We claim that Fascist policies and expert advice assembled in the early 1940s accelerated the introduction of pesticides into Spanish agriculture and promoted the emergence of the Spanish pesticide industry in the times of autarky. Agricultural engineers were the key protagonists in this process, but other human and non-human actors also played a pivotal role: a new pest (the Colorado beetle), Francoist politicians, farmers, landowners and industry managers. Our focus is on the use of pesticides against the Colorado beetle (the main threat to the potato crop), and the transition from arsenical pest…
Enhancing the performance of HSDPA communication with multipoint transmission techniques
2015
The evolution of mobile phones, tablets and other mobile communication devices has led to a significant increase in the amount of data delivered over mobile networks. In order to satisfy the climbing data rate demands of customers, existing mobile broadband networks are being expanded with new features that allow ubiquitous and consistent networking experience. This research presents three multipoint transmission techniques for Wideband Code Division Multiple Access (WCDMA) based High-Speed Downlink Packet Access (HSDPA) communication protocol. Multiflow, High-Speed Single-Frequency Network (HS-SFN) and Multipoint-to-Point Single-Frequency Network (M2P-SFN) enable transmission of user-dedicat…