Fighting and aggressive sound determines larger male to win male-male competition in a bark beetle.

Intrasexual selection occurs in male-male competition over access to females and usually results in the larger male winning. While much research has documented that size matters, little is known about how the larger male wins. Dendroctonus valens is an aggregating monogamous bark beetle in which males have large variation in body size and display intense competition over females.

Physical contact, volatiles, and acoustic signals contribute to monogamy in an invasive aggregating bark beetle.

The behavioral strategies and mechanisms by which some insects maintain monogamous mating systems are not well understood. We investigated the mating system of the bark beetle Dendroctonus valens, and identified several contributing mechanisms. Field and laboratory observations suggest the adults commonly form permanent bonds during host colonization.

Corn defense responses to nitrogen availability and subsequent performance and feeding preferences of beet armyworm (Lepidoptera: Noctuidae).

Many studies have reported the effect of nitrogen (N) fertilization on plant constitutive defense responses; however, little is known about their effects on plant induced defense patterns and its consequence for insect herbivores. In our experiments, the effects of N availability on growth, nutritional quality (N content, protein/carbohydrate [P:C] ratio, modified gross energy [MGE]), and constitutive phenolics of corn, Zea mays L. were quantified.

[The aquation of oxaliplatin and the effect of acid].

Aim: To investigate the aquation of oxaliplatin in aqueous solution at different temperatures and gain the kinetic data.

Methods: Electronic conductometry and high performance liquid chromatography (HPLC) were used to measure the oxaliplatin content in the reaction systems at different time.

Results: The aquation of oxaliplatin followed a pseudo-first-order rate law.

[Analysis of a novel platinum anticancer compound HJ5 by high performance liquid chromatography].

Cis-dichloroamine (4-amino-2, 2, 6, 6-tetramethylpiperidine-1-oxyl) platinum (II) (abbreviated to HJ5) is a novel platinum anticancer compound which has prospects for research and application. In order to establish a conventional analytical method, an HPLC has been studied. Under the conditions of acetonitrile-water (10:90, volume ratio) as mobile phase, detection wavelength of 210 nm, a Phenomenex column C18(150 mm x 3.