BACKGROUND & OBJECTIVES Due to ever-growing insecticide resistance in mosquito vectors and environmental contamination by synthetic insecticides, plants may be a source of alternative agents for mosquito control. Therefore, the present investigation involved the determination of larvicidal and phytochemical properties of Callistemon rigidus leaf extracts against Anopheles gambiae, Aedes aegypti...

Meloidogyne incognita egg masses were immersed in different concentrations of six volaule fatty acids to bioassay their toxic effect on embryonic development and hatching. Exposure to a 250 ppm aqueous solution of volatile fatty, acids completely suppressed egg hatching within 48 hours. When exposed to a 125 ppm concentration hatching was reduced 75 % by acetic acid, 91% by propionic acid, 23% ...

Ozone measurements (daily maximum values) from the Aerometric Information Retrieval System database are analyzed for selected sites, during 1980 to 1988, in southeastern USA. Frequency distributions, for most sites during most years, show a typical bell-shaped curve with the higher frequency around the yearly daily maximum ozone mean of about 100 to about 110 microg m(-3) (50-55 ppbv). Abnormal...

The present study deals with the pre-treatment of sugar cane molasses for the enhanced production of citric acid by Aspergillus niger NG-4. Different metal complexing agents such as potassium ferrocyanide [K4Fe(CN)6] and ethylene diamine tetra acetic acid (EDTA) were also employed for molasses pre-treatment and the concentrations varied from 50-350 ppm. The maximum production of citric acid (36...

Sulfites and other preservatives are considered food additives to limit bacterial contamination, and are generally regarded as safe for consumption by governmental regulatory agencies at concentrations up to 5000 parts per million (ppm). Consumption of bactericidal and bacteriostatic drugs have been shown to damage beneficial bacteria in the human gut and this damage has been associated with se...

Experiments were conducted in bovine isolated bronchi and pulmonary vessels to test whether nitric oxide (NO) could reduce carbachol and hypoxia or KCl (120 mM) induced contraction. Segments of bronchus or pulmonary vessels were slipped around a water-filled balloon connected to a pressure transducer, and mounted in 3 ml thermostated chamber filled with Krebs-Henseleit solution equilibrated wit...

A total of 31 corn samples collected from households in the counties of Cixian and Linxian of the People's Republic of China, where high incidences of esophageal cancer have been reported, were analyzed for fumonisin B1 (FB1), aflatoxin, and total trichothecene mycotoxins. High levels of FB1 (18 to 155 ppm; mean, 74 ppm) were found in 16 of the samples that showed heavy mold contamination. FB1,...

Piper aduncum L. is used in folk medicine to treat respiratory and inflammatory diseases. The aim of this study was to analyze the essential oil from leaves of P. aduncum collected in the Brazilian Cerrado, North of Minas Gerais, as well as to evaluate the larvicidal activity of this oil and of its major constituent. The essential oil was analyzed by gas chromatography coupled to flame ionizati...

Ten different contact, systemic and combination products of fungicides were evaluated for their effectiveness against black spot papaya Asperisporium caricae under in vitro condition by following poisoned food technique. Among tested, trifloxystrobin 25% + tebuconazole 50% WG, propiconzole EC zineb 68% hexaconazole 4% WP successful completely (100%) inhibiting the growth A. at all concentration...

An experimental trial was carried out during the season from March 2018 – June at Horticulture farm of Lovely Professional University, Phagwara (Punjab). utilising a randomised block design, consists three replications. The current study included eleven treatments, including control with different PGR dosages Maleic hydrazide (200, 250, and 300 ppm, MH), Naphthalene acetic acid (50, 100, 150ppm...