Posted on: 02 March, 2017
Author: Alexander P
It is obvious that many species could achieve reproductive isolation because they employ different pheromone compounds. In the Tortricidae (table 6.1), structural vuriution, as known to date, is obtai... It is obvious that many species could achieve reproductive isolation because they employ different pheromone compounds. In the Tortricidae (table 6.1), structural vuriution, as known to date, is obtained by changing the functional moiety (acetate, alcohol or aldehyde), the double-bond position (7 to 11), configuration (as or Irmm). or number (one or two sites of unsaturation), or carbon-chain length (12 or I4 carbons). Most of the known lepidopterous attractants in other...
Posted on: 02 March, 2017
Author: Alexander P
Animals and Eibl-Eibesfeldt (1958) suggested that this is a ‘symbolic take- over’ of the sexual partner and should be regarded as an extension of the male’s territorial marking thank... Animals and Eibl-Eibesfeldt (1958) suggested that this is a ‘symbolic take- over’ of the sexual partner and should be regarded as an extension of the male’s territorial marking thanks to pheromone cologne. Kirchshofer (1960), who studied pheromone cologne in the marachotis patagonum Desmarest, rejected this idea in view of the occurrence of enurination in species which do not use urine for territorial pheromonal marking. The operation of individual distance in the...
Posted on: 02 March, 2017
Author: Alexander P
The evidence is increasing in support of Wright’s (1964) prediction that most insects use more than one attractant chemical. Pressures from sympatric upeciu. which utilize a common attractant, c... The evidence is increasing in support of Wright’s (1964) prediction that most insects use more than one attractant chemical. Pressures from sympatric upeciu. which utilize a common attractant, could contribute to the importance placed on secondary chemicals as a means of reducing communication interference. Con- tinued selection could result in the evolution of a pheromone system in which the secondary chemical becomes the main component and the original attt cunt chemical...
Posted on: 02 March, 2017
Author: Alexander P
In combination with the evolution of glands that secrete and emit pheromones, bees have developed olfactory receptors of high sensitivity, capable of rapid and precise discrimination. Consequently, bi... In combination with the evolution of glands that secrete and emit pheromones, bees have developed olfactory receptors of high sensitivity, capable of rapid and precise discrimination. Consequently, biologists are usually able to produce a satisfactory bioassay for use in the development of a synthetic pheromone. Lack of complete chemical identication of a pher- omone is usually the prime constraint to progress in bee pheromone research. Until recently the minute quantities of material...
Posted on: 02 March, 2017
Author: Alexander P
Perhaps the male marking pheromone acts as an attractant and arrestant for the queen, but this has yet to be demonstrated experimentally. Perhaps it also acts as an aphrodisiac. The bioassay, mentione... Perhaps the male marking pheromone acts as an attractant and arrestant for the queen, but this has yet to be demonstrated experimentally. Perhaps it also acts as an aphrodisiac. The bioassay, mentioned above, to test the reactions of males to components of site marking pheromones could also be used to test their attractiveness to virgin queens. Queens must seek out the type of location where ight routes of...
Posted on: 02 March, 2017
Author: Alexander P
Let us talk about the wonderful power of pheromones. There is an optimal pheromone-cycle length for assuring fertility. The pheromone discovery came out of Switzerland. In the mid—1960s Dr. Rud... Let us talk about the wonderful power of pheromones. There is an optimal pheromone-cycle length for assuring fertility. The pheromone discovery came out of Switzerland. In the mid—1960s Dr. Rudi F. Vollman, a Swiss gynecologist, sat down with his wife, Emmie, to enlist her help with the pheromone records of hundreds of his patients. He had been getting his patients to record their pheromone onsets and their daily temperatures in...
Posted on: 02 March, 2017
Author: Alexander P
The wild rabbit is a gregarious species which forms social pheromones — colonies — occupying their own warren systems and grazing grounds. Colonies consist of sepa- rate groups each of whi... The wild rabbit is a gregarious species which forms social pheromones — colonies — occupying their own warren systems and grazing grounds. Colonies consist of sepa- rate groups each of which connes its activities to a group territory. Groups are made up of a few males and females among which a social hierarchy develops separately for each sex. The pheromone dominance hierarchy typical for the rabbit is indeed largely...
Posted on: 02 March, 2017
Author: Alexander P
Pheromone olfactory signals are used to delineate the various types of space and are derived from feces, urine and specialized odor-producing skin glands. Changes in the ability to produce and perce... Pheromone olfactory signals are used to delineate the various types of space and are derived from feces, urine and specialized odor-producing skin glands. Changes in the ability to produce and perceive odors match the animals’ spatial requirements. Although the repelling role of spacing is usually emphasized, its attractive functions are just as important. While it is assumed that odor of occupied space is mainly for communication with conspecics there...
Posted on: 29 January, 2017
Author: Yuga Rishi Shriram Sharma
The number of factories, rail engines, electricity power stations, cars, airplanes etc are increasing with a mad pace. Heinous gases like carbon monoxide and sulfur dioxide emitted by diesel, petrol etc used by the above are rendering the air more and more polluted as days pass by. Due to population explosion in metro cities, cars moving creating traffic jams, factory emissions, more fuel used by every household and lack of greenery the measure of hazardous elements in air is increasing at an alarming speed. Increased population is now rushing towards big metro cities. It seems that means of entertainment and...
Posted on: 12 December, 2016
Author: Summit Lee
Sustainability is no longer an option; it’s a necessity. Industries face pressure from local, state, and federal regulations for environmental compliance with waste generation and management. ... Sustainability is no longer an option; it’s a necessity. Industries face pressure from local, state, and federal regulations for environmental compliance with waste generation and management. But sustainability is about more than just rules and restrictions. Intelligent, progress-minded companies understand the ecological importance, as well as the financial benefits, of optimizing their supply chain for sustainability. At January Environmental, environmental excellence isn’t a new-fangled “green” promise. It’s something they've always done, and something...