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Pandiyan Indiragandhi,Chang Mann Yoon,Jeong Oh Yang,Soo Won Cho,Tong Min Sa,Gil Hah Kim 한국응용생명화학회 2010 Applied Biological Chemistry (Appl Biol Chem) Vol.53 No.5
Whiteflies are sap-sucking insects belonging to the hemipteran order. They are well known for their menace to agriculture, as pests and vectors, and are reported for their bacterial and Rickettsia association in B biotype. In the present investigation, cul
Nondestructive quality evaluation of periodically poled lithium niobate crystals by diffraction
Pandiyan, Krishnamoorthy,Kang, Yeon Sook,Lim, Hwan Hong,Kim, Byoung Joo,Cha, Myoungsik The Optical Society 2009 Optics express Vol.17 No.20
<P>Quasi-phase-matching devices are usually fabricated by electric field poling over photolithographically defined electrode patterns on ferroelectric crystal substrates. For the optimal nonlinear optical performance of such devices, the micro-poled domain structure must ensure good fidelity to the designed grating structure. We present a nondestructive diffraction method to evaluate the quality of periodically poled lithium niobate crystals, by utilizing index modulation caused by the internal field effects. Our proposed method is much simpler than the conventional second-harmonic generation experiment, and provides a fast, low-cost but accurate means for micro-poling quality evaluation.</P>
Pandiyan Indira Gandhi,Kulaiyappa Gunasekaran,Selvaraj Poonguzhali,Rangasamy Anandham,,김길하,정근욱,Tongmin Sa 한국응용곤충학회 2005 Journal of Asia-Pacific Entomology Vol.8 No.4
Laboratory experiment was conducted to compare the relative toxicity of biopesticides like Pseudomonas fluorescens strain pf1 and neem oil with imidacloprid, quinalphos, and endosulfan against an egg parasitoid, Trichogramma chilonis, and a predatory green lacewing, Chrysoperla carnea. Biopesticides were safer than chemical insecticides in minimizing harmful effects on development and behavior of two natural enemies. P. fluorescens treatment recorded high parasitism (≈73%) and parasitoid egg development (≈72%) of T. chilonis. It also gave high egg (≈75%) development on C. carnea. Neem oil recorded 58.9 % parasitoid emecrgence, and 59.3 % parasitism, and 63.1 % egg hathability. Other chemical insecticides exhibited high damages on the natural enemies.
Pandiyan, Arunkumar,Rajagopalan, Ramaseshan,Tanveer, Waqas Hassan,Yu, Wonjong,Cha, Suk Won,Krishna Moorthy, Suresh Babu Elsevier 2018 ELECTROCHIMICA ACTA Vol.264 No.-
<P><B>Abstract</B></P> <P>Fast ionic conduction through strain engineered heteroepitaxial film have been demonstrated well. However, this effect in the preferentially orientated film remains to be unexplored. Here, we report the effect of interatomic distance between cation-oxygen bonds on the oxygen ionic transport in preferetially (111) oriented Ce<SUB>0.80</SUB>Sm<SUB>0.1</SUB>M<SUB>0.1</SUB>O<SUB>2-δ</SUB> (M = Gd, Nd, Pr, La) film over an amorphous quartz substrate. With the increase in ionic radii of dopant cation, the films exhibited a substantial increase in tensile strain with a change in lattice constant (Δ<I>a</I>) in the order of ∼1.14% (Δ<I>a</I>: 1.14% (Sm<SUP>3+</SUP> + La<SUP>3+</SUP>) > 1.04% (Sm<SUP>3+</SUP> + Pr<SUP>3+</SUP>) > 0.69% (Sm<SUP>3+</SUP> + Nd<SUP>3+</SUP>) > 0.14% (Sm<SUP>3+</SUP>) > 0.08% (Sm<SUP>3+</SUP> + Gd<SUP>3+</SUP>)) has strong influence on defect association enthalpy (ΔH<SUB>a</SUB>) leading to the change in migration energy of oxygen ion during conduction process. Highest conductivity was observed from Ce<SUB>0.85</SUB>Sm<SUB>0.1</SUB>Nd<SUB>0.1</SUB>O<SUB>2-δ</SUB>, which is four times greater than that of Ce<SUB>0.85</SUB>Sm<SUB>0.2</SUB>O<SUB>2-δ</SUB>. As a consequence, it is clear that optimum co-dopant is needed to attain the critical ionic radii/tensile strain to achieve the maximum ionic conductivity in the preferentially oriented ceria-based thin film. This work demonstrates the importance of tuning the ionic radii of dopant cation, which can effectively facilitate the optimum expansion of lattice to attain the fast ionic conduction process in (111) oriented thin film based solid electrolyte.</P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
Pandiyan, Rajesh,Ayyaru, Sivasankaran,Ahn, Young-Ho Elsevier 2018 Ecotoxicology and environmental safety Vol.158 No.-
<P><B>Abstract</B></P> <P>In membrane bioreactor (MBR) technology, nanocomposite membrane has a great potential to improve the filtration performance and antifouling. However, antibacterial activity of nanoparticles (NPs) is a significant disadvantage which can be impacted to bacterial growth and microbial community in MBRs. The modified polyethersulfone (PES) ultrafiltration (UF) membranes in the study were prepared by using TiO<SUB>2</SUB> NPs and TiO<SUB>2</SUB> NPs functionalized with sulfonation (STiO<SUB>2</SUB>). The antibacterial effect of NPs and non-toxic properties of nanocomposite membranes were examined by using three different Gram-negative bacterial species isolated from a local full scale membrane bioreactor treating municipal wastewater (<I>Escherichia coli, Pantoea agglomerans</I>, and <I>Pseudomonas graminis</I>). Results are revealed that the TiO<SUB>2</SUB> and STiO<SUB>2</SUB> NPs have 60% of antibacterial activity based on disc diffusion, viability tests, and TEM analysis. However, the PES-TiO<SUB>2</SUB> and PES-STiO<SUB>2</SUB> nanocomposite UF membranes showed significantly lower antibacterial activity (<95%, significance at <I>p</I> < 0.0001), indicating innocuous to bacterial growth. This study highlights that the PES-TiO<SUB>2</SUB> and PES-STiO<SUB>2</SUB> nanocomposite membrane is more sustainable than PES membrane and promising materials for MBRs, by taking advantage of non-toxic properties to bacterial growth.</P> <P><B>Highlights</B></P> <P> <UL> <LI> TiO<SUB>2</SUB> and STiO<SUB>2</SUB> NPs showed 60% of antibacterial activity in all three bacterial species. </LI> <LI> PES-TiO<SUB>2</SUB> and -STiO<SUB>2</SUB> membranes revealed 95% non-toxic in bacterial cell viability test. </LI> <LI> PES-TiO<SUB>2</SUB> and -STiO<SUB>2</SUB> UF membranes are sustainable materials for MBR system. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
Emerging Research Advancements to Overcome the Peach Spring Frost
Pandiyan Muthuramalingam,Rajendran Jeyasri,Yeonju Park,Seongho Lee,Jae Hoon Jeong,Yunji Shin,Jinwook Kim,Sangmin Jung,Hyunsuk Shin 한국식물병리학회 2023 식물병연구 Vol.29 No.3
The phenomena of global warming has led to an increase in the average air temperature in temperate climates. Springtime frost damage is becoming more common, and after a period of dormancy, damage to buds, blooms, and developing fruits is greater significant than damage from low winter temperatures. Peaches are a crucial crop among moderate fruits. Spring frost damage in peaches can have a negative effect on crop growth, yield, and quality. It is noteworthy that these plants have evolved defenses against spring frost damage while being exposed to a variety of low temperatures in the early spring. In this current review, recent research advancements on spring frost damage avoidance in peaches were deliberated. Additionally, adaptive mechanisms of peach, such as deacclimation and reacclimation, were emphasized. Moreover, the emerging advancements using various omics approaches revealed the peach physiology and molecular mechanisms comprehensively. Furthermore, the use of chemical products and understanding the spring frost mechanisms through the use of environmental chamber temperature stimulation and infrared thermography studies were also discussed. This review is essential groundwork and paves the way to derive and design future research for agronomists and horticulturalists to overcome the challenges of spring frost damage avoidance and crop management in these circumstances.
Poling Quality Evaluation of Periodically Poled Lithium Niobate Using Diffraction Method
Krishnamoorthy Pandiyan,Yeon-Suk Kang,,Om Prakash,차명식 한국광학회 2008 Current Optics and Photonics Vol.12 No.3
We demonstrated a simple way of evaluating the duty cycle error in periodically polled lithium niobate (PPLN) based on the method of binary phase diffraction grating. To demonstrate this method, –Z face etched PPLN of desired periods were fabricated by the standard electric field poling technique. The etched PPLN was considered as a surface–relief binary phase grating. The diffraction patterns were recorded for different spatial locations along the length of the sample. The experimentally observed efficiencies of the diffracted orders were compared with the theoretically calculated values to estimate the duty cycle error.