Distribution of luminescent Vibrio harveyi and their bacteriophages in a commercial shrimp hatchery in South India

Luminescent Vibrio harveyi is a natural microflora of marine and coastal water bodies and is associated with mortality of larval shrimp in penaeid shrimp hatcheries. It is also known that the bacteriophages occur virtually in all places where their hosts exist. In this study, distribution of luminescent V. harveyi and the bacteriophages affecting these hosts was examined in a commercial Penaeus monodon hatchery during three shrimp larval production cycles, including a cycle affected by luminescent bacterial (LB) disease outbreak

Involvement of Enterobacter cloacae in the mortality of the fish, Mugil cephalus

Enterobacter cloacae, an enteric bacterium that belongs to the family Enterobacteriaceae, is widely distributed in nature. It is found in faeces of humans and animals, water, soil, plants, plant materials, insects and dairy product

Classifying User Predilections using Naïve Bayes Classifier (NBC) and Jaccard Similarity for Service Recommender System in Big Data Applications

Service recommender systems have been shown as valuable tools for providing appropriate recommendations to users. The main objective is to identify a system that will classify the user reviews using effective methods and provide personalized recommendations to the users. The proposed architecture will present the different ratings and rankings of services to different users by considering diverse users' preferences, and therefore it will meet users' personalized requirements. The data classification can be achieved through analysing the user review as positive or negative using Naive Bayes classifier (NBC) in large-scale datasets and Jaccard Similarity and MinHash used to compute the similarity and provide the recommendation to user

EFFECT OF CHEMICAL TREATMENTS ON QUALITY AND VASE LIFE OF CUT CARNATION (DIANTHUS CARYOPHYLLUS L.) CVS. MASTER AND YELLOW CANDY

An experiment was undertaken during 2016-2017 at the laboratory of Department of Horticulture, Annamalai University, to study the effect of different chemicals on quality and vase life of cut carnation flowers Cvs. Master and Yellow Candy. The selected flowers were analysed using Completely Randomized Design and held in different holding solutions containing STS (0.5 mM, 1.0 mM and 1.5 mM), salicylic acid, silver nitrate, boric acid, citric acid (each at 100, 150 and 200 ppm) along with sucrose 5% in all the above holding solutions and control. The water, quality and vase life parameters were observed in both the cultivars. Holding of carnation flowers with citric acid 150 ppm + sucrose 5% resulted in maximum CUW (25.30 and 24.19g flower-1), and minimum CTLW (19.80 and 20.74g flower-1 respectively), and STS 1.0 mM + Sucrose 5% resulted in maximum fresh weight (15.56 and 14.64g flower-1), diameter of the flower (7.85 cm and 7.53 cm), slowest stem strength (88.47° and 87.66°), with vase life of (7.76 and 7.34 days) as compared with (5.72 and 4.96 days) in control in both the cultivars. Among different chemicals STS 1.0 mM + Sucrose 5% was found highly effective for longevity of carnation flowers

Optimal Pinning Control for Synchronization over Temporal Networks

In this paper, we address the finite time synchronization of a network of dynamical systems with time-varying interactions modeled using temporal networks. We synchronize a few nodes initially using external control inputs. These nodes are termed as pinning nodes. The other nodes are synchronized by interacting with the pinning nodes and with each other. We first provide sufficient conditions for the network to be synchronized. Then we formulate an optimization problem to minimize the number of pinning nodes for synchronizing the entire network. Finally, we address the problem of maximizing the number of synchronized nodes when there are constraints on the number of nodes that could be pinned. We show that this problem belongs to the class of NP-hard problems and propose a greedy heuristic. We illustrate the results using numerical simulations.Comment: 7 pages and 3 figures. Submitted for American Control Conference 202

Risk Factors for Scrub Typhus, Murine Typhus, and Spotted Fever Seropositivity in Urban Areas, Rural Plains, and Peri-Forest Hill Villages in South India: A Cross-Sectional Study.

Scrub typhus and spotted fever group rickettsioses are thought to be common causes of febrile illness in India, whereas they rarely test for murine typhus. This cross-sectional study explored the risk factors associated with scrub typhus, tick-borne spotted fever, and murine typhus seropositivity in three different geographical settings, urban, rural, and hill villages in Tamil Nadu, South India. We enrolled 1,353 participants living in 48 clusters. The study included a questionnaire survey and blood sampling. Blood was tested for Orientia tsutsugamushi (scrub typhus), Rickettsia typhi (murine typhus), and spotted fever group Rickettsia IgG using ELISA. The seroprevalence of scrub typhus, spotted fever, and murine typhus were 20.4%, 10.4%, and 5.4%, respectively. Scrub typhus had the highest prevalence in rural areas (28.1%), and spotted fever was most common in peri-forested areas (14.9%). Murine typhus was more common in rural (8.7%) than urban areas (5.4%) and absent in peri-forested hill areas. Agricultural workers had a higher relative risk for scrub typhus, especially in urban areas. For murine typhus, proximity to a waterbody and owning a dog were found to be major risk factors. The main risk factors for spotted fever were agricultural work and living in proximity to a forest. Urban, rural plains, and hill settings display distinct epidemiological pattern of Orientia and rickettsial infections. Although scrub typhus and spotted fever were associated with known risk factors in this study, the findings suggest a different ecology of murine typhus transmission compared with other studies conducted in Asia

Primeras observaciones sobre las características larvales del sapo de Günther, Duttaphrynus hololius (Günther, 1876)

Describimos por primera vez la morfología larval del sapo de Günther, Duttaphrynus Hololius (Günther, 1876) encontrado en charcos rocosos de poca profundidad de agua de lluvia en Gingee hills, Eastern Ghats. Se observaron 123 renacuajos en varias etapas de metamorfosis en 14 charcos muestreados. Examinamos ejemplares en diferentes estadíos para la caracterización morfológica de estos. No hallamos otras especies de anfibios sintópicos en los alrededores de estos charcos de rocas.Palabras clave: Amphibia, Anura, India, Gingee hills, renacuajos gregarios, charcos rocosos, morfología de renacuajo.Abstract:First observations on the larval characteristics of Günther's toad Duttaphrynus Hololius (GÜNTHER, 1876)We for the first time describe the larval morphology of Günther’s toad, Duttaphrynus hololius (Günther, 1876) from shallow rainwater puddles on rocks in Gingee hills, Eastern Ghats, India. We observed 123 metamorphosing tadpoles of various stages on 14 puddles surveyed. A few samples from each stage were examined for morphological characterization. No other amphibian species was seen syntopically in or around these rocky puddles.Key words: Amphibia, Anura, India, Gingee hills, gregarious tadpoles, rocky puddles, tadpole morphology

New site record of Grizzled Giant Squirrel <i>Ratufa macroura</i> from Thiruvannamalai Forest Division, Eastern Ghats, Tamil Nadu, India

We report a new site locality and eastern most population of Grizzled Giant Squirrel from Thiruvannamalai Forest Division. Further studies are required to assess the population of this species in the Tamil Nadu part of Eastern Ghats