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Variability in cone,seed and seedling characteristics of Pinus kesiya Royle ***

Journal of Forestry Research 2015年第2期26卷 331-337页

作者： Ombir Singh satyam bordoloi N.Mahanta Forest Tree Seed Laboratory Silviculture DivisionForest Research Institute Biotechnology and Genetics Division Rain Forest Research Institute

Investigations were made to determine the nature and extent of variations present for 10 morphological characters of cone,seed and seedlings of 17 plus trees（PTs）of Pinus kesiya growing in eastern Himalayas（Meghalaya state） of *** significant variations has been observed in cone weight,cone length,cone diameter,seed length,seed diameter,seed weight,number of seeds per cone,seed germination,seedling height and seedling collar diameter among different PTs of the *** positive correlation（p ／ 0.01） between seed weight,cone length and cone diameter showed that seed weight in *** depend more on the cone *** germination is found positively correlated（p ／ 0.01） with seed weight,seed diameter,cone size and number of seeds per cone in the *** geographical factors,latitude and altitude are found positively correlated（p ／ 0.05） with cone weight and seed diameter,*** genetic parameters for seed,cone and seedlings of PTs of *** also showed a wide range of variability in terms of variance,coefficient of variability,broad sense heritability,genetic advance and genetic *** weight,seeds per cone and seedling diameter showed high heritability values（[75） coupled with maximum genetic *** with such values indicate the presence of good amount of heritable additive components and are under strong genetic *** findings of the study revealed that PTs expressed both phenotypic and genotypic differences in the seed,cone and seedling characters,which may be attributed to the differences in genetic makeup of various PTs and environmental factors *** and environmental *** presence of high variability in *** PTs for different characters provide further opportunities to improve the population in subsequent generations so as to establish this species as an important timber tree to be grown on less fertile and degraded soils in its distributional ranges.

关键词： Plus trees Seed traits Heritability Genetic gain Improvement

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Natural product-based treatment potential for type 2 diabetes mellitus and cardiovascular disease

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World Journal of Diabetes 2024年第7期15卷 1603-1614页

作者： Dharmsheel Shrivastav satyam Kumar Kumbhakar Shivangi Srivastava Desh Deepak Singh Amity Institute of Biotechnology Amity University RajasthanJaipur 303002RajasthanIndia Department of Biotechnology Govt Veer Surendra Say P.G.CollegeGariaband 493889ChhattisgarhIndia Department of Life Science Chhatrapati Shahu ji Maharaj UniversityKanpur 208024Uttar PradeshIndia

BACKGROUND Type 2 diabetes(T2D)is a metabolic disease of impaired glucose utilization and a major cause of cardiovascular disease(CVD).The pathogenesis of both diseases shares common risk factors and mechanisms,and both are significant contributors to global morbidity and *** of natural products for T2D mellitus(T2DM)and CVD can be seen as a potential preventive and effective therapeutic *** To critically evaluate the therapeutic potential of natural products in T2D and coronary artery disease(CAD).METHODS By using specific keywords,we strategically searched the PubMed *** controlled trials(RCTs)were searched as the primary focus that examined the effect of natural products on glycemic control,oxidative stress,and antioxidant *** focused on outcomes such as low blood glucose levels,adjustment on markers of oxidative stress and *** screening fulllength papers,we included 9 RCTs in our review that met our inclusion *** In the literature search on the database,we found that various natural products like plant secondary metabolites play a diverse role in the management of *** ginseng,sesame oil and cocoa flavanols proved effective in lowering blood glucose levels and controlling blood pressure,which are key factors in managing T2DM and *** diabetic patients Melissa officinalis effectively reduce inflammation and shows diabetes *** fish oil and flaxseed oil reduced insulin levels and inflammatory markers,suggesting benefits for both *** lipid profile and endothelial function were enhanced by Nigella sativa oil and Terminalia chebula,which is significant for the management of cardiovascular risk factors in *** Bilberry extract also showed promise for improving glycemic control in patients with *** The high level of antioxidant,anti-inflammatory,and anti-angiogenic properties found in natural products makes them promising therapeutic opt

关键词： Type 2 diabetes mellitus Cardiovascular disease Natural products Antioxidants Oxidative stress Therapeutic impact Global burden

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Biological perspectives in geotechnics:Application and monitoring

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Journal of Rock Mechanics and Geotechnical Engineering 2024年第7期16卷 2854-2878页

作者： Partha Narayan Mishra Surabhi Jain Thierry Bore Ilhan Chang Yeong-Man Kwon Yijie Wang Hirak Ranjan Dash Ashutosh Kumar satyam Tiwari Ningjun Jiang Sarat Kumar Das Alexander Scheuermann Department of Civil Engineering Indian Institute of Technology KanpurKanpur208016India School of Civil Engineering University of QueenslandSt LuciaQLD4072Australia Department of Civil Engineering Indian Institute of Technology DhanbadDhanbad826004India Department of Civil System Engineering Ajou UniversitySuwon-si16499Republic of Korea School of Engineering and IT University of New South WalesCanberraACT2600Australia Department of Civil and Environmental Engineering Northwestern UniversityEvanstonIL60208USA Department of Civil and Environmental Engineering The Hong Kong Polytechnic UniversityHong KongChina National Forensic Sciences University New Delhi110085India Southeast University Nanjing211189China

This paper builds on exploring the applications of biomediated pathways to solve geotechnical ***,the state of the art of biological remediation strategies including microbial remediation and phytoremediation have been introduced and critically reviewed in the context of decontaminating the ***,biopolymerisation,biomineralisation and bioneutralisation processes have been depicted with a special emphasis on the applications including but not limited to soil stabilisation,soil erosion prevention,anti-desertification and pH *** of these methods have their own limitations and bottlenecks while scaling up,and these challenges have been summarised and some possible paths to overcome the challenges have also been *** state of the art of electromagnetic(EM)monitoring methods to capture the effects of biomediation on spatio-temporal soil properties are then highlighted as a non-invasive and rapid pathway to track the progress of biomediated soil ***,each of the technologies discussed have been evaluated for their maturity level using the principles of technology readiness level(TRL).A majority of the technologies amounting to around 77%are still in the TRL 4e7,*** the valley of *** is thus evident that development of these technologies needs to be supported with appropriate funding for improving their maturity to a level of industrial deployment.

关键词： Biogeotechnics Bioremediation Phytoremediation Biopolymers Biomineralisation Electromagnetic(EM)methods technology readiness level(TRL)

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Coupling effect of pond ash and polypropylene fiber on strength and durability of expansive soil subgrades:An integrated experimental and machine learning approach

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Journal of Rock Mechanics and Geotechnical Engineering 2021年第5期13卷 1101-1112页

作者： Nitin Tiwari Neelima satyam Department of Civil Engineering Indian Institute of Technology IndoreIndoreIndia

This study explores the coupling effect of pond ash(PA)and polypropylene(PP)fiber to control the strength and durability of expansive *** PA is used to chemically treat the expansive soil and PP fiber is adopted as reinforcement against tensile *** sustainable use of PA and PP fiber are demonstrated by performing mechanical(*** compressive strength,split tensile strength and ultrasonic pulse velocity),chemical(pH value,electrical conductivity and calcite content),and microstructural analyses before and after 2nd,4th,6th,8th and 10th freezing-thawing(F-T)*** curing methods with 7 d,14 d and 28 d curing periods are considered to reinforce the 5%,10%,15%and 20%PA-stabilized expansive soil with 0.25%,0.5%and 1%PP *** order to develop predictive models for mechanical and durability parameters,the experimental data are processed utilizing artificial neural network(ANN),in association with the leave-one-out cross-validation(LOOCV)as a resampling method and three different activation *** mechanical and durability properties of the PA-stabilized expansive soil subgrades are increased with PP fiber *** results of ANN modeling predict the mechanical properties perfectly,and the correlation coefficient(R)approaches up to 0.96.

关键词： Expansive soil subgrades Waste utilization Freezing-thawing(F-T) Microstructural assessment Pond ash(PA) Polypropylene(PP)fiber

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Probabilistic rainfall thresholds in Chibo, India: estimation and validation using monitoring system

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Journal of Mountain Science 2019年第4期16卷 870-883页

作者： Abhirup DIKSHIT Neelima satyam Discipline of Civil Engineering Indian Institute of Technology Indore Simrol

The Himalayan region has been severely affected by landslides especially during the monsoons. In particular, Kalimpong region in Darjeeling Himalayas has recorded several landslides and has caused significant loss of life, property and agricultural land. The study region, Chibo has experienced several landslides in the past which were mainly debris and earth slide. Globally, several types of rainfall thresholds have been used to determine rainfall-induced landslide incidents. In this paper, probabilistic thresholds have been defined as it would provide a better understanding compared to deterministic thresholds which provide binary results, i.e., either landslide or no landslide for a particular rainfall event. Not much research has been carried out towards validation of rainfall thresholds using an effective and robust monitoring system. The thresholds are then validated using a reliable system utilizing Microelectromechanical Systems(MEMS) tilt sensor and volumetric water content sensor installed in the region. The system measures the tilt of the instrument which is installed at shallow depths and is ideal for an early warning system for shallow landslides. The change in observed tilt angles due to rainfall would give an understanding of the applicability of the probabilistic model. The probabilities determined using Bayes' theorem have been calculated using the rainfall parameters and landslide data in 2010-2016. The rainfall values were collected from an automatic rain gauge setup near the Chibo region. The probabilities were validated using the MEMS based monitoring system setup in Chibo for the monsoon season of 2017. This is the first attempt to determine probabilities and validate it with a robust and effective monitoring system in Darjeeling Himalayas. This study would help in developing an early warning system for regions where the installation of monitoring systems may not be feasible.

关键词： Early warning Probabilistic thresholds Kalimpong Monitoring

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Optimization of growth medium for microbially induced calcium carbonate precipitation(MICP) treatment of desert sand

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Journal of Arid Land 2023年第7期15卷 797-811页

作者： Monika DAGLIYA Neelima satyam Ankit GARG Department of Civil Engineering Indian Institute of TechnologyIndore 453552India Guangdong Engineering Center for Structure Safety and Health Monitoring Shantou UniversityShantou 515063China

Wind-induced sand erosion is a natural process, and can have several negative impacts on human health, environment, and economy. To mitigate the wind-induced sand erosion, an environmental friendly technique that helps to bind soil particles is desirable. The microbially induced calcium carbonate precipitation(MICP) treatment has lately become renowned and a viable alternative to enhance the binding of sand particles(especially against wind erosion). The efficiency of Sporosarcina pasteurii bacteria in inducing calcite formation can be influenced by various factors, including the type of growth media used for bacterial culture. Most of the studies have mainly validated the efficiency of S. pasteurii bacteria usually under single growth media for the MICP treatment. However, the efficiency of S. pasteurii under different growth media on calcite formation is rarely explored. The current study explores the effect of *** bacteria on calcite formation under the presence of three different growth media, namely,molasses(MS), tryptic soy broth(TB), and nutrient broth(NB). The three growth media have been applied in the laboratory with and without bacterial solution(control samples). Altered cementation media concentrations(0.5 and 1.0 M) with different pore volumes(PVs), namely, 0.25, 0.50, and 1.00 PV were used in sand-filled tubes for 7 and 14 treatment cycles(1 cycle=24 h). The pH and EC were measured for 12-h period in every 2 h interval, to monitor values at the time of treatment at room temperature. The calcite precipitation was confirmed using SEM(scanning electron microscope), PXRD(powder X-ray diffraction), and calcimeter tests. It was observed that MS generates lower calcite precipitation as compared with NB and TB. However, MS has the advantage of being more economical and abundant(waste product from sugar mills and refineries) as compared with other growth media(NB and TB). It was observed that the minimum and the maximum calcite precipitation using MS i

关键词： growth media molasses tryptic soy broth nutrient broth S.pasteurii calcium carbonate

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Texture evaluation in AZ31/AZ31 multilayer and AZ31/AA5068 laminar composite during accumulative roll bonding

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Defence Technology（防务技术） 2020年第3期16卷 514-519页

作者： Pankaj Kumar Aviral Madhup Prasad RKalvala satyam Suwas Chemical and Materials Engineering University of NevadaRenoNV89557USA Materials Engineering Indian Institute of ScienceBangalore560012India

This article presents the texture development of magnesium AZ31 alloy in the accumulative roll bonded(ARB) AZ31/AZ31 multilayer and AZ31/AA5086 laminate *** comparative study demonstrates that the texture evolution in AZ31 in a multilayer system is strongly influenced by the interfaces.A typical basal texture of AZ31 has been observed in AZ31/AZ31 multilayer with texture intensity increased with the rolling *** of AZ31/AA5086 interface in the laminate composite leads to a tilted basal texture along the rolling direction(RD) in AZ31 *** texture intensity of composite increased initially with rolling reduction and weakened at the higher rolling *** of texture in AZ31 during the laminate processing at higher strain has been attributed to the development of wavy interfaces in AZ31/AA5086 laminate.

关键词： Accumulative roll bonding Defence application AZ31 alloy Texture Composite Laminates

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Rock-like behavior of biocemented sand treated under non-sterile environment and various treatment conditions

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Journal of Rock Mechanics and Geotechnical Engineering 2021年第3期13卷 705-716页

作者： Meghna Sharma Neelima satyam Krishna RReddy Discipline of Civil Engineering Indian Institute of Technology IndoreIndore453552India Department of Civil Materialsand Environmental EngineeringUniversity of Illinois at ChicagoChicagoILUSA

Microbially induced calcite precipitation(MICP)is a recently developed technique for microbiological ground improvement that has been applied for mitigating various geotechnical ***,the major challenges,such as calcite precipitation uniformity,presence of different bacteria,cementation solution optimization for cost reduction,and implementation under non-sterile and uncontrolled field environment are still not fully explored and require detailed investigation before field *** study aims to address these challenges of MICP to improve the geotechnical properties of sandy *** series of experiments were conducted using poorly graded Narmada River(India)sand,which were subjected to various biotreatment schemes and tested for unconfined compressive strength(UCS),split tensile strength(STS),ultrasonic pulse velocity(UPV),hydraulic conductivity(after 6 d,12 d,and 18 d of treatment),and calcite *** microstructure of sand was examined through a scanning electron microscope(SEM).Initially,the sand was individually augmented with two non-pathogenic bacterial strains,***(S.)pasteurii and Bacillus(B.)*** stopped-flow injection method was adopted to provide cementation solutions at three different durations(treatment cycle)of 12 h,24 h,and 48 h and three different pore volumes(PVs)of 1,0.75,and *** pore volume here refers to the porosity which is expressed as a ratio,i.e.a porosity of 50%was used as *** results showed rock-like behaviors of biocemented sand with the UCS,STS,and UPV enhancement up to 2333 kPa,437 kPa,and 2670 m/s,*** hydraulic conductivity reduction of 96.6%was achieved by 12%of calcite formation after 18 d of treatment using Sporosarcina pasteurii,12-h treatment cycle,and one pore volume of cementation media in each ***,a 24-h treatment cycle and 0.5-pore volume cementation solution were found to be the optimal treatment which was effective and economical to achiev

关键词： Bacteria Microbially induced calcite precipitation (MICP) Soil stabilization Microstructure Calcite content

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Experimental study on mitigating wind erosion of calcareous desert sand using spray method for microbially induced calcium carbonate precipitation

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Journal of Rock Mechanics and Geotechnical Engineering 2022年第5期14卷 1556-1567页

作者： Monika Dagliya Neelima satyam Meghna Sharma Ankit Garg Department of Civil Engineering Indian Institute of Technology IndoreIndoreIndia Department of Civil and Environmental Engineering Shantou UniversityShantouChina L.N.Gumilyov Eurasian National University Nur-SultanKazakhstan

Wind erosion is one of the significant natural calamities worldwide, which degrades around one-third of global land. The eroded and suspended soil particles in the environment may cause health hazards, *** and respiratory diseases, due to the presence of harmful contaminants, bacteria, and *** present study evaluates the feasibility of microbially induced calcium carbonate precipitation(MICP)technique to mitigate wind-induced erosion of calcareous desert sand(Thar desert of Rajasthan province in India). The temperature during biotreatment was kept at 36℃ to stimulate the average temperature of the Thar desert. The spray method was used for bioaugmentation of Sporosarcina(S.) pasteurii and further treatment using chemical solutions. The chemical solution of 0.25 pore volume was sprayed continuously up to 5 d, 10 d, 15 d, and 20 d, using two different concentration ratios of urea and calcium chloride dihydrate viz 2:1 and 1:1. The biotreated samples were subjected to erosion testing(in the wind tunnel) at different wind speeds of 10 m/s, 20 m/s, and 30 m/s. The unconfined compressive strength of the biocemented crust was measured using a pocket penetrometer. The variation in calcite precipitation and microstructure(including the presence of crystalline minerals) of untreated as well as biotreated sand samples were determined through calcimeter, scanning electron microscope(SEM), and energydispersive X-ray spectroscope(EDX). The results demonstrated that the erosion of untreated sand increases with an increase in wind speeds. When compared to untreated sand, a lower erosion was observed in all biocemented sand samples, irrespective of treatment condition and wind speed. It was observed that the sample treated with 1:1 cementation solution for up to 5 d, was found to effectively resist erosion at a wind speed of 10 m/s. Moreover, a significant erosion resistance was ascertained in15 d and 20 d treated samples at higher wind speeds. The calcite content

关键词： Control wind erosion Microbially induced calcium carbonate precipitation(MICP) Surface strength Wind tunnel Calcite precipitation

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Effect of forest fire on tree diversity and regeneration potential in a tropical dry deciduous forest of Mudumalai Tiger Reserve, Western Ghats, India

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Ecological Processes 2017年第1期6卷 331-338页

作者： satyam Verma Dharmatma Singh Sathya Mani Shanmuganathan Jayakumar Environmental Informatics and Spatial Modeling Lab Department of Ecology and Environmental SciencesSchool of Life SciencesPondicherry UniversityPuducherry 605014India

Introduction:The study was conducted in Mudumalai Tiger Reserve,in the Western Ghats to understand the effect of a single fire event on tree diversity and regeneration *** forest patches were selected which were unburned,2-year-old burn,5-year-old burn,and 15-year-old *** 0.1 ha square plots were laid randomly in all four patches and analyzed for tree diversity,stand structure,and regeneration of tree ***:A total of 4129 individuals of tree species were recorded in field surveys,comprising 3474 seedlings,121 saplings,and 534 ***,40 tree species were recorded in study plots,from which 28 species were seedlings,16 species were saplings,and 37 species were at tree ***:Tree diversity decreased in 2-year-old and 5-year-old burnt plots and was reached to the level of unburnt plots in 15 years of *** of small size classes started increasing after the *** density increased linearly in subsequent years after fire but sapling and tree density recorded less than control in B2 but was higher in B5 and *** overall fire affected diversity,but regeneration showed a positive trend.

关键词： Dry deciduous forest Forest fire Fire mapping Regeneration Western Ghats

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