The enzyme polyphenol oxidase (PPO) catalyzes the oxidation of phenolic compounds into highly reactive quinones. Polymerization of PPO-derived quinones causes the postharvest browning of cut or bruised fruit, but the native physiological functions of PPOs in undamaged, intact plant cells are not well understood. Walnut (Juglans regia) produces a rich array of phenolic compounds and possesses a ...

this study was carried out to investigate the important characteristics in some cultivars/genotypes of persianwalnut (juglans regia l.), black walnut (j. nigra l.), and walnut inter-specific hybrids: paradox (j. hindsii × j.regia) and royal (j. hindsii × j. nigra) in kamalshahr research station in karaj in 2011-2012. in the study,vegetative vigor was evaluated based on trunk cross-sectional are...

walnut is an important nut crop worldwide. iran is one of the walnut centers of diversity and cultivation. morphological traits and rapd primers were applied to determine genetic diversity among 31 iranian and four foreign walnut genotypes. from 14 rapd primers, 180 bands were amplified among which 174 were polymorphic. the lowest and highest similarity coefficients were 0.37 and 0.89 respectiv...

the aim of this study was to determine the effect of different dietary levels of walnut leaves powder and vitamin e supplementation on blood antioxidant status, production performance and egg quality characteristics in commercial laying hens. a total number of 216 leghorn hy-line w-36 (70 week old) strain laying hens used the completely randomized design were divided into 6 groups with 3 replic...

______________________________________________________________________________ Abstract: Information on soil and leaf nutrient concentrations for black walnut are of value only when they are properly sampled, accurately analyzed, and the results correctly interpreted. Guidelines for interpreting soil and leaf analyses and leaf symptoms are presented along with recommendations for correcting nut...

investigations were initiated this year to develop field and laboratory viability assays for stored walnut pollen, indentify conditions suitable for in vitro pollen germination and pollen tube growth, and determine pollen tube growth rates in pistillate flowers. Results of this project will provide background information for future investigations of transmission of pollen-borne virus, factors i...

Testes size often predicts the winner during episodes of sperm competition. However, little is known about the source of nutrients allocated to testes development, or testes plasticity under varying nutrient availability. Among many holometabolous insects, metabolic resources can derive from the larval or adult diet. Distinguishing the source of nutrients allocated to testes can shed light on l...

background: this study aimed to assess the relationship between meal frequency with mental distress and violent behavior among a nationally representative sample of iranian children and adolescents. materials and methods: the participants of this national study were 14,880 iranian students with 6 to 18 years of age. they were selected from urban and rural regions of iran by multi-stage cluster ...