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No Effect of the Acoustic Stimulus on the Reproductive Rate in Myzus persicae
Soojin Jang,Yikweon Jang 한국응용곤충학회 2012 한국응용곤충학회 학술대회논문집 Vol.2012 No.10
An aphid usually stays at one feeding site for a long time for development and reproduction. The green peach aphids, Myzus persicae (Sulzer), feed consistently and regularly throughout all stages of nymphs and adult at one feeding site. In M. persicae, honey dew production, which indicates a state of feeding, occurs at regular intervals within a given stage, and moving, which may be related to escape or dispersal, interrupts feeding, The results of the playback experiments showed that acoustic stimuli with frequencies of 100 and 10000 Hz were effective in inducing feeding repression in M. persicae. That is, HDP occurred less often, and MV occurred more often and longer under acoustic stimuli. In this study, we tested whether the acoustic stimulus effective for inducing feeding suppression decreased reproductive rate in M. persicae. A group of 20 aphids were placed in a host plant and was subject to the acoustic stimulus with two frequency components, 100 and 10000 Hz, for a given time (1, 3, 6, and 12 hours) each day for four days. The result of this experiment showed that the acoustic stimulus did not affect the reproductive rate, regardless of exposure time, in M. persicae.
Lifetime Calling Patterns and Tactics in the Field Cricket Teleogryllus emma (Orthoptera: Gryllidae)
Soojin Jang,Yikweon Jang,Jae Chun Choe 한국응용곤충학회 2009 한국응용곤충학회 학술대회논문집 Vol.2009 No.05
Males of many cricket species produce calling songs to attract receptive, conspecific females. Calling songs which affected by calling pattern are critical for male mating success, since male with no or limited calling songs are unable to attract female crickets. Investigating among- and within-individual variation in calling pattern may reveal the presence of alternative mating tactics such as attracting females by producing calling songs or being satellites in which males intercept females who are attracted to calling males. In this study, I investigated patterns of calling song production during the entire adulthood of 32 laboratory-reared and 24 field-captured individuals of Teleogryllu emma. Using recording system which can record acoustic signals from up to 32 individuals simultaneously, I measured daily calling output (DCO) and total calling output (TCO) in addition to acoustic parameters of calling songs and classified T.emma males into consistent and inconsistent singers based on the consistency of singing. Consistent singers lived longer, sang longer both in a day and during the lifetime than the inconsistent singers. These results suggest that the consistent singers in this study may be considered to employ the calling tactic. In lab-reared individuals, there seemed to be a trade-off between increasing pulse duration and length of phrases and ling chirp although older males produced calling songs with longer ling chirps and more multiple phrases.
Polydiacetylene-based Bead Gels as Colorimetric Sensor for Biogenic Amines Detection in Spoiled Food
Soojin JANG,Sungbaek SEO,Eun-Kyung LIM 한국생물공학회 2021 한국생물공학회 학술대회 Vol.2021 No.10
Biogenic amines (BAs), such as cadaverine, propylamine and putrescine, are released from every food, but they are especially released in spoilage foods. Small amounts of BAs have no effect on the human body, however large amounts can cause some problems. We have developed a colorimetric sensor that can easily determine the extent of spoilage food during distribution and storage. Polydiacetylene (PDA) has a unique color (blue) through a photopolymerization reaction and has a unique optical property of changing from blue to red when an external stimulus is applied. And, alginate is a natural polymer derived from brown algae, which has the properties of hardening when an alginate solution is added to calcium chloride solution, and is widely used as an additive such as pharmaceuticals and foodstuffs. Based on these characteristics, PDA-based bead gels were fabricated by simply mixing PDA-embedded liposome and alginate solution. And this is a colorimetric sensor, and the color changes from blue to red in the presence of BAs, so it can be easily checked with the naked eye.