Allelopathic Potential of Adhatoda vasica NEES

Ayaz,Sajjida,Hussain, Farrukh,Ilahi, Ihsan,Kil, Bong-Seop 圓光大學校 基礎自然科學硏究所 1989 基礎科學硏究誌 Vol.8 No.3

파키스탄에 나는 Adhatoda vasica는 열대, 아열대성 관목으로 덤불을 이루고 있는데 그 주위에는 식물이 비교적 드물고 잘 자라지 못한다. 그래서 이 식물의 수용추출액, 빗물세탈액, 낙엽 낙지 및 임상토양을 써서 5종 실험 식물의 종자발아, 유식물 생장, 생체량, 수분과 엽록소 함량을 조사해 본 결과 상당히 억제됨을 알았다. 크로마토그래피 분석으로 caffeic acid등 5종의 화학물질을 확인했으며 이들은 A. vasica식물이 우점하며 그 주위 식물에 미치는 영향 즉 알에로패티작용에 일차적으로 관계가 있다고 본다. Adhatoda vasica Nees is a shrubby component of tropical and subtropical vegetation in Pakistan. It harbours relatively few unhealthy associated species in and around its thickets. Aqucous extracts, ram leachates, litter from shoots and soil underneath it invariably reduced germination, early growth, biomass, moisture and chlorophyll contents of Pemnisetum americanum, Setaria italica, Zea mays, Brassica campestris and Triticum vulgare in different laboratory experiments. Chromatographic analysis revealed the presence of caffeic, ferulic, vanillic, p-coumaric, p-OH-benzoic, and tannic acids in aqucous extracts. The phytotoxicity was related to the test species used, part assayed and parameter measured. It is suggested that the preclusion of the associated species and the dominance of A. vasica is primarily due to allelopathy. Negative grazing also provides better chances for its establishment.

Numerical Analysis for Thermal Management of an Electric Vehicle Battery Module with the Nanofluid

Ayaz Hamza(아야즈 함자),Honghyun Cho(조홍현) 대한기계학회 2021 대한기계학회 춘추학술대회 Vol.2021 No.6

Thermal management system plays a key role in maintaining the temperature of the battery module in its optimal operating condition. Among different cooling strategies, the liquid cooling thermal management system is widely utilized due to its high energy density. Several factors affect the performance of the system like system design, mass flowrate, and different coolant. To find an optimal condition for the thermal management system, a three-dimensional rectangular cooling plate was designed and employed with base fluid and nanofluid to analyze its performance. The performance of this system was analyzed by two main factors were selected the battery maximum temperature and temperature difference along the battery module. The temperature difference along the module was 12°C for a time of 30 minutes.

Performance Evaluation of X-MAC/BEB Protocol for Wireless Sensor Networks

Ayaz Ullah,안종석 한국통신학회 2016 Journal of communications and networks Vol.18 No.5

This paper proposes an X-MAC/BEB protocol that runs abinary exponential backoff (BEB) algorithm on top of an X-MACprotocol to save more energy by reducing collision, especially indensely populated wireless sensor networks (WSNs). X-MAC, alightweight asynchronous duty cycle mediumaccess control (MAC)protocol, was introduced for spending less energy than its predeces-sor, B-MAC. One of X-MAC ’s conspicuous technique is a mech-anism to allow senders to promptly send their data when theirreceivers wake up. X-MAC, however, has no mechanism to dealwith sudden traffic fluctuations that often occur whenever closelylocated nodes simultaneously diffuse their sense data. To precisely evaluate the impact of the BEB algorithm on X-MAC, this paper builds an analytical model of X-MAC/BEB thatintegrates the BEB model with the X-MAC model. The analyticaland simulation results confirmed that X-MAC/BEB outperformedX-MAC in terms of throughput, delay, and energy consumption,especially in congested WSNs.

Accuracy and reliability of 2-dimensional photography versus 3-dimensional soft tissue imaging

Ayaz, Irem,Shaheen, Eman,Aly, Medhat,Shujaat, Sohaib,Gallo, Giulia,Coucke, Wim,Politis, Constantinus,Jacobs, Reinhilde Korean Academy of Oral and Maxillofacial Radiology 2020 Imaging Science in Dentistry Vol.50 No.1

Purpose: This study was conducted to objectively and subjectively compare the accuracy and reliability of 2-dimensional(2D) photography and 3-dimensional(3D) soft tissue imaging. Materials and Methods: Facial images of 50 volunteers(25 males, 25 females) were captured with a Nikon D800 2D camera (Nikon Corporation, Tokyo, Japan), 3D stereophotogrammetry (SPG), and laser scanning (LS). All subjects were imaged in a relaxed, closed-mouth position with a normal smile. The 2D images were then exported to Mirror^® Software (Canfield Scientific, Inc, NJ, USA) and the 3D images into Proplan CMF^® software (version 2.1, Materialise HQ, Leuven, Belgium) for further evaluation. For an objective evaluation, 2 observers identified soft tissue landmarks and performed linear measurements on subjects' faces (direct measurements) and both linear and angular measurements on all images(indirect measurements). For a qualitative analysis, 10 dental observers and an expert in facial imaging (subjective gold standard) completed a questionnaire regarding facial characteristics. The reliability of the quantitative data was evaluated using intraclass correlation coefficients, whereas the Fleiss kappa was calculated for qualitative data. Results: Linear and angular measurements carried out on 2D and 3D images showed excellent inter-observer and intra-observer reliability. The 2D photographs displayed the highest combined total error for linear measurements. SPG performed better than LS, with borderline significance (P=0.052). The qualitative assessment showed no significant differences among the 2D and 3D imaging modalities. Conclusion: SPG was found to a reliable and accurate tool for the morphological evaluation of soft tissue in comparison to 2D imaging and laser scanning.

Chia seed (Salvia Hispanica L.) added yogurt reduces short-term food intake and increases satiety: randomised controlled trial

Ayaz, Aylin,Akyol, Asli,Inan-Eroglu, Elif,Cetin, Arzu Kabasakal,Samur, Gulhan,Akbiyik, Filiz The Korean Nutrition Society 2017 Nutrition research and practice Vol.11 No.5

BACKGROUND/OBJECTIVE: Several studies have reported that consumption of Salvia Hispanica L.,commonly known as chia seed, may exert beneficial effects on health outcomes. The main purpose of this study was to examine the influence of chia seed consumption as a mid-morning snack on short-term satiety. SUBJECTS/METHODS: Subjects (n = 24) were tested using a randomized, cross-over design consisting of three mid-morning snacks. Yogurt with no chia seed, yogurt with 7 g chia seed, and yogurt with 14 g chia seed were given to subjects on different test days. After subjects were asked to report visual analog scale (VAS) scores on sensory outcomes, ad libitum lunch was served, and energy intake of individuals was measured. RESULTS: VAS scores indicated that participants reported significantly lower scores for hunger (P = 0.033), prospective food consumption (P = 0.031), amounts of food that could be consumed (P = 0.017), desire for sugary foods (P = 0.015), and higher scores for satiety (P = 0.031) on the test days with 7 g and 14 g chia seed. Energy intake of individuals during ad libitum lunch was significantly lower when they consumed yogurt with 7 g or 14 g chia seed (P = 0.037). CONCLUSIONS: The study demonstrated that chia seed consumption as a mid-morning snack may induce short-term satiety in healthy individuals.

Multiview registration-based handheld 3D profiling system using visual navigation and structured light

Ayaz, Shirazi Muhammad,Kim, Min Young Informa UK (TaylorFrancis) 2017 International journal of optomechatronics Vol.11 No.1

<P>This article describes the 3D handheld profiling system composed of a stereo camera and an illumination projector to collect high-resolution data for close range of applications. Visual navigation approach is either based on feature matching or on accurate target, and the target-based approach was found to be more accurate if the 3D object has less texture on its surface. Block matching algorithm was used to render the single-view 3D reconstruction. For multiview 3D modeling, coarse registration and final refinement of the point clouds using iterative closest point algorithm were utilized. The proposed approach yields good accuracy for multiview registration as demonstrated in the results of this research.</P>

Adhatoda visica NEES 의 알레로페티 효과

Ayaz Sajjida,Farrukh Hussain,Ihsan Ilahi,길봉섭 (Bong Seop Kil) 한국식물학회 1989 Journal of Plant Biology Vol.32 No.2

Adhatoda vasica Nees is a shrubby component of tropical and subtropical vegetation in Pakistan. It harbours relatively few unhealthy associated species in and around its thickets. Aqueous extracts, rain leachates, litter from shoots and soil underneath it invariably reduced germination, early growth, biomass, moisture and chlorophyll contents of Pennisetum americamm, Setaria italica, Zea mays, Brassica campestris and Triticum vulgare in different laboratory experiments. Chromatographic analysis revealed the presence of caffeic, ferulic, vanillic, p-coumaric, p-OH-benzoic, and tannic acids in aqueous extracts. The phytotoxicity was related to the test species used, part assayed and parameter measured. It is suggested that the preclusion of the associated species and the dominance of A. vasica is primarily due to allelopathy. Negative grazing also provides better chances for its establishment.

Effect of plate size on meal energy intake in normal weight women

Ayaz, Aylin,Akyol, Asli,Cetin, Cansu,Besler, H. Tanju The Korean Nutrition Society 2016 Nutrition Research and Practice Vol.10 No.5

BACKGROUND/OBJECTIVES: Use of smaller plates to control food intake is a commonly recommended strategy for restricting energy intake, despite conflicting results. Therefore, the aim of this study was to examine whether or not three different sizes of plates influence energy intake during a multi-itemed buffet meal in normal weight women. SUBJECTS/METHODS: This was a cross-over study conducted on 37 female participants aged 19-25 years with normal BMI levels. Participants were recruited from Hacettepe University and the surrounding community. On experimental days, participants ate a standard breakfast and were then randomly assigned to eat lunch using a small (19 cm), medium (23 cm), or large (28 cm) diameter plate. Visual analogue scale (VAS) scores on sensory and satiety outcomes were measured for all meals. Energy and macronutrient intakes during lunch were recorded. RESULTS: There was no evidence that use of a smaller plate size reduced energy or specific macronutrient intake during the free choice lunch meal. Multiple visits to the serving table were not associated with energy or macronutrient intake. Plate size did not affect VAS scores during the test days. CONCLUSIONS: Plate size did not influence energy intake, meal composition, or palatability in normal weight women during a multi-itemed open buffet lunch. Studies in natural settings at the population level are needed to clarify current outcomes.

Selection of Web Services by Using Diversified Service Rank

Ayaz Nazir Ahmed,Farooque Azam 보안공학연구지원센터 2014 International Journal of Software Engineering and Vol.8 No.4

The effect of acrylamide incorporation on the thermal and physical properties of denture resins

Ayaz, Elif Aydogan,Durkan, Rukiye,Bagis, Bora The Korean Academy of Prosthodonitics 2013 The Journal of Advanced Prosthodontics Vol.5 No.2

PURPOSE. Polymethyl methacrylate (PMMA) is the most commonly used denture base material despite typically low in strength. The purpose of this study was to improve the physical properties of the PMMA based denture base resins (QC-20, Dentsply Ltd., Addlestone, UK; Stellon, AD International Ltd, Dentsply, Switzerland; Acron MC; GC Lab Technologies Inc., Alsip, Japan) by copolymerization mechanism. MATERIALS AND METHODS. Control group specimens were prepared according to the manufacturer recommendations. In the copolymer groups; resins were prepared with 5%, 10%, 15% and 20% acrylamide (AAm) (Merck, Hohenbrunn, Germany) content according to the moleculer weight ratio, respectively. Chemical structure was characterized by a Bruker Vertex-70 Fourier transform infrared spectroscopy (FTIR) (Bruker Optics Inc., Ettlingen, Germany). Hardness was determined using an universal hardness tester (Struers Duramin, Struers A/S, Ballerup, Denmark) equipped with a Vickers diamond penetrator. The glass transition temperature ($T_g$) of control and copolymers were evaluated by Perkin Elmer Diamond DSC (Perkin Elmer, Massachusetts,USA). Statistical analyses were carried out using the statistical package SPSS for Windows, version 15.0 (SPSS, Chicago, IL, USA). The results were tested regarding the normality of distribution with the Shapiro Wilk test. Data were analyzed using ANOVA with post-hoc Tukey test (P<.01). RESULTS. The copolymer synthesis was confirmed by FTIR spectroscopy. Glass transition temperature of the copolymer groups were higher than the control groups of the resins. The 10%, 15% and 20% copolymer groups of Stellon presented significantly higher than the control group in terms of hardness. 15% and 20% copolymer groups of Acron MC showed significantly higher hardness values when compared to the control group of the resin. Acrylamide addition did not affect the hardness of the QC-20 resin significantly. CONCLUSION. Within the limitation of this study, it can be concluded that copolymerization of PMMA with AAm increased the hardness value and glass transition temperature of PMMA denture base resins.