Pasadena, CA, United States
Pasadena, CA, United States

Tetra Tech is a provider of consulting, engineering, construction and technical services which includes resource management and infrastructure, based out of Pasadena, California, United States. With approximately 13,000 employees in various countries, including individuals with expertise in science, research, engineering, construction, and information technology. The company's annual revenue for the fiscal year ended September 30, 2012 was $2.02 billion. Their Slogan is, "Complex World. Clear Solutions." Wikipedia.

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Patent
Tetra Tech Inc. | Date: 2017-03-08

A system and method for adjusting light emitter output for a railway track inspection system based on data feedback from one or more sensors.


Patent
Tetra Tech Inc. | Date: 2016-10-12

A system and method for adjusting light emitter output for a railway track inspection system based on data feedback from one or more sensors.


Kim J.H.,ILSI Health and Environmental science Institute | Scialli A.R.,Tetra Tech Inc.
Toxicological Sciences | Year: 2011

Thalidomide was a widely used drug in the late 1950s and early 1960s for the treatment of nausea in pregnant women. It became apparent in the 1960s that thalidomide treatment resulted in severe birth defects in thousands of children. Though the use of thalidomide was banned in most countries at that time, thalidomide proved to be a useful treatment for leprosy and later, multiple myeloma. In rural areas of the world that lack extensive medical surveillance initiatives, thalidomide treatment of pregnant women with leprosy has continued to cause malformations. Research on thalidomide mechanisms of action is leading to a better understanding of molecular targets. With an improved understanding of these molecular targets, safer drugs may be designed. The thalidomide tragedy marked a turning point in toxicity testing, as it prompted United States and international regulatory agencies to develop systematic toxicity testing protocols; the use of thalidomide as a tool in developmental biology led to important discoveries in the biochemical pathways of limb development. In celebration of the Society of Toxicology's 50th Anniversary, which coincides with the 50th anniversary of the withdrawal of thalidomide from the market, it is appropriate to revisit the lessons learned from the thalidomide tragedy of the 1960s. © The Author 2011. Published by Oxford University Press on behalf of the Society of Toxicology. All rights reserved.


Gibb H.,Tetra Tech Inc. | O'Leary K.G.,Tetra Tech Inc.
Environmental Health Perspectives | Year: 2014

Background: Mercury (Hg) is used in gold mining to extract gold from ore by forming "amalgam"-a mixture composed of approximately equal parts mercury and gold. Approximately 15 million people, including approximately 3 million women and children, participate in artisanal small-scale gold mining (ASGM) in developing countries. Thirty-seven percent of global air emissions of Hg are produced by ASGM. The recently adopted Minamata Convention calls for nations to gather health data, train health-care workers, and raise awareness in regard to ASGM activity. Objective: The purpose of our review was to evaluate the current literature regarding the health effects of Hg among those working and/or living in or near ASGM communities. Methods: We searched PubMed, ScienceDirect, and Google Scholar for studies relating to health effects and biomarkers of Hg exposure in ASGM communities. Articles published from 1990 through December 2012 were evaluated for relevance. Discussion: Studies reporting health assessments, kidney dysfunction, neurological disorders and symptoms, and immunotoxicity/autoimmune dysfunction in individuals living in or near an ASGM community were identified. More than 60 studies that measured biomarkers of Hg exposure in individuals living in or near ASGM communities were also identified. These studies, conducted in 19 different countries in South America, Asia, and Africa, demonstrated that hair and urine concentrations are well above World Health Organization health guidance values in ASGM communities. Conclusions: ASGM workers and their families are exposed to Hg vapor, and workers, workers' families, and residents of nearby and downstream communities are consuming fish heavily contaminated with methylmercury.


Patent
Tetra Tech Inc. | Date: 2013-01-16

An anthropogenic sorbent material modified for sequestering and/or attenuating multiple chemical and/or biological pollutant species, both organic and inorganic, in an aqueous environment is disclosed as well as a method of sequestering and/or attenuating multiple chemical and/or biological pollutant species, both organic and inorganic, in an aquatic ecosystem by capping at least a portion of a sedimentary basin of the aquatic ecosystem.


A decontaminant and method for decontaminating an infrastructural system is disclosed, the decontaminant including from about 3% to about 5%, by weight, of a permanganate compound; from about 8% to about 12%, by weight, of a strong mineral acid; and from about 80% to about 90%, by weight, of a solvent.


Patent
Tetra Tech Inc. | Date: 2015-05-29

A system and method for adjusting light emitter output for a railway track inspection system based on data feedback from one or more sensors.


Patent
Tetra Tech Inc. | Date: 2015-05-29

A system and method for inspecting a railway track bed using a plurality of sensors that are synchronized for rapid interrogation of a railway track bed while the sensors are in motion at a high rate of speed.


Patent
Tetra Tech Inc. | Date: 2015-05-29

A protective shroud is provided for enveloping light radiating from a light emitter used with a sensor system for mapping of a railway track. The protective shroud includes: a rigid body having a frame and at least one opaque panel connected to the frame, the rigid body defining at least a first portion of a light radiation zone; a skirt formed of high density fibers extending from adjacent a bottom edge of the at least one opaque panel to adjacent a ground surface; at least one light emitter connected to the rigid body adjacent a top edge of the rigid body to emit light radiation into the light radiation zone; and at least one sensor connected to the rigid body adjacent the top edge of the rigid body to sense the light emitted from the at least one light emitter.


Patent
Tetra Tech Inc. | Date: 2015-05-29

A 3D track assessment system is disclosed for identifying and assessing features of a railway track bed based on 3D elevation and intensity data gathered from the railway track bed.

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