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95-668: The Hudson River Valley Greenway is a system of parks, trails, kayak/canoe routes, etc. along New York's Hudson River , and the organization that serves to promote and preserve them. The Greenway system includes the Hudson Valley Rail Trail . Fourteen counties are in the Greenway area. Dutchess County , Putnam County , and Westchester County are in the Hudson River Valley Greenway Compact Area. This article about

190-432: A trophic cascade can occur. PCBs can cause harm to human health or even death when eaten. PCBs can be transported by birds from aquatic sources onto land via feces and carcasses. PCBs undergo xenobiotic biotransformation, a mechanism used to make lipophilic toxins more polar and more easily excreted from the body. The biotransformation is dependent on the number of chlorine atoms present, along with their position on

285-455: A bridge for plastic pollution to be transported from terrestrial environments into marine environments. It has been estimated that 88–95% of marine plastic is exported into the ocean by just 10 major rivers. An organism can accumulate PCBs by consuming other organisms that have previously ingested PCBs from terrestrial, freshwater, or marine environments. The concentration of PCBs within an organism will increase over their lifetime; this process

380-499: A coolant in electric transformers, PCBs still persist in built environments. Some PCBs share a structural similarity and toxic mode of action with dioxins . Other toxic effects such as endocrine disruption (notably blocking of thyroid system functioning) and neurotoxicity are known. The bromine analogues of PCBs are polybrominated biphenyls (PBBs), which have analogous applications and environmental concerns. An estimated 1.2 million tons have been produced globally. Though

475-404: A large depositional plain near its mouth. This lack of significant deposits near the river mouth differs from most other American estuaries. Around New York Harbor, sediment also flows into the estuary from the ocean when the current is flowing north. The area around Hudson River was inhabited by indigenous peoples ages before Europeans arrived. The Lenape , Wappinger , and Mahican branches of

570-607: A location in Manhattan , New York is a stub . You can help Misplaced Pages by expanding it . Hudson River The Hudson River is a 315-mile (507 km) river that flows from north to south primarily through eastern New York , United States. It originates in the Adirondack Mountains of upstate New York at Henderson Lake in the town of Newcomb , and flows southward through the Hudson Valley to

665-538: A semi-closed application. In contrast, the major open application of PCBs was in carbonless copy ("NCR") paper , which even presently results in paper contamination. Other open applications were lubricating and cutting oils, and as plasticizers in paints and cements, stabilizing additives in flexible PVC coatings of electrical cables and electronic components, pesticide extenders, reactive flame retardants and sealants for caulking , adhesives , wood floor finishes, such as Fabulon and other products of Halowax in

760-462: A significant quantity of PCBs. As the pressure of ocean water increases with depth, PCBs become heavier than water and sink to the deepest ocean trenches where they are concentrated. A small volume of PCBs has been detected throughout the Earth's atmosphere. The atmosphere serves as the primary route for global transport of PCBs, particularly for those congeners with one to four chlorine atoms. In

855-417: A treatment of unwanted PCBs generally requires high heat or catalysis (see Methods of destruction below). PCBs readily penetrate skin , PVC (polyvinyl chloride), and latex (natural rubber). PCB-resistant materials include Viton , polyethylene , polyvinyl acetate (PVA), polytetrafluoroethylene (PTFE), butyl rubber , nitrile rubber , and Neoprene . PCBs are derived from biphenyl , which has

950-592: Is 315 miles (507 km) long, with depths of 30 feet (9.1 m) for the stretch south of the Federal Dam, dredged to maintain the river as a shipping route. Some sections there are around 160 feet deep, and the deepest part of the Hudson, known as "World's End" (between the US Military Academy and Constitution Island ) has a depth of 202 feet (62 m). The Hudson and its tributaries, notably

1045-531: Is believed that the first use of the name Hudson River in a map was in a map created by the cartographer John Carwitham in 1740. In 1939, the magazine Life described the river as "America's Rhine", comparing it to the 760-mile (1,220 km) Rhine in Central and Western Europe. The tidal Hudson is unusually straight for a river, and the earliest colonial Dutch charts of the Hudson River designated

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1140-402: Is called bioaccumulation. PCB concentrations within an organism also change depending upon which trophic level they occupy. When an organism occupies a high trophic level, like orcas or humans , they will accumulate more PCBs than an organism that occupies a low trophic level, like phytoplankton . If enough organisms with a trophic level are killed due to the accumulation of toxins, like PCB,

1235-673: Is credited for the Old World 's discovery of continental North America, with his journey in 1497 along the continent's coast. In 1524, Florentine explorer Giovanni da Verrazzano sailed north along the Atlantic seaboard and into New York Harbor, however he left the harbor shortly thereafter, without navigating into the Hudson River. In 1598, Dutch men employed by the Greenland Company wintered in New York Bay . In 1609

1330-577: Is estimated to have formed between 26,000 and 13,300 years ago. Along the river, the Palisades are of metamorphic basalt , or diabases , the Highlands are primarily granite and gneiss with intrusions , and from Beacon to Albany, shales and limestones , or mainly sedimentary rock . The Narrows were most likely formed about 6,000 years ago at the end of the last ice age. Previously, Staten Island and Long Island were connected, preventing

1425-626: Is performing more functions in the warmer months, it naturally has a faster metabolism and has less PCB accumulation. However, multiple cold-water periods mixed with toxic PCBs with coplanar chlorine molecules can be detrimental to perch health. Enantiomers of chiral compounds have similar chemical and physical properties, but can be metabolized by the body differently. This was looked at in bowhead whales ( Balaena mysticetus ) for two main reasons: they are large animals with slow metabolisms (meaning PCBs will accumulate in fatty tissue) and few studies have measured chiral PCBs in cetaceans. They found that

1520-530: Is the primary source of PCB contamination in the atmosphere. In the biosphere , PCBs can be degraded by the sun , bacteria or eukaryotes , but the speed of the reaction depends on both the number and the disposition of chlorine atoms in the molecule: less substituted, meta - or para -substituted PCBs undergo biodegradation faster than more substituted congeners. In bacteria, PCBs may be dechlorinated through reductive dechlorination , or oxidized by dioxygenase enzyme. In eukaryotes, PCBs may be oxidized by

1615-431: Is thought to be linked to PCB 77 metabolism, something that was not measured in this study. Temperature plays a key role in the ecology, physiology and metabolism of aquatic species. The rate of PCB metabolism was temperature dependent in yellow perch ( Perca flavescens ). In fall and winter, only 11 out of 72 introduced PCB congeners were excreted and had halflives of more than 1,000 days. During spring and summer when

1710-548: The Algonquians lived along the river, mostly in peace with the other groups. The Algonquians in the region mainly lived in small clans and villages throughout the area. One major settlement was called Navish, which was located at Croton Point , overlooking the Hudson River. Other settlements were located in various locations throughout the Hudson Highlands . Many villagers lived in various types of houses, which

1805-605: The Battle of Harlem Heights the following month. Later that year, the British and Continental Armies were involved in skirmishes and battles in rivertowns of the Hudson in Westchester County, culminating in the Battle of White Plains . Also in late 1776, New England militias fortified the river's choke point known as the Hudson Highlands , which included building Fort Clinton and Fort Montgomery on either side of

1900-840: The Bear Mountain Bridge , which connects Westchester and Rockland Counties. Afterward, leaving the Hudson Highlands, the river enters Haverstraw Bay , the widest point of the river at 3.5 miles (5.6 km) wide. Shortly thereafter, the river forms the Tappan Zee and flows under the Tappan Zee Bridge , which carries the New York State Thruway between Tarrytown and Nyack in Westchester and Rockland Counties respectively. At

1995-716: The Delaware River at Honesdale, Pennsylvania , and the Hudson River at Kingston, New York. This canal enabled the transportation of coal, and later other goods as well, between the Delaware and Hudson River watersheds. The combination of these canals made the Hudson River one of the most vital waterways for trade in the nation. During the Industrial Revolution , the Hudson River became a major location for production, especially around Albany and Troy. The river allowed for fast and easy transport of goods from

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2090-579: The Dutch East India Company financed English navigator Henry Hudson in his search for the Northeast Passage , but thwarted by sea ice in that direction, he sailed westward across the Atlantic in pursuit of a Northwest Passage . During the search, Hudson sailed up the river that would later be named after him. He then sailed upriver to a point near Stuyvesant (Old Kinderhook), and the ship’s boat with five members ventured to

2185-521: The Federal Dam in Troy . There are about two high tides and two low tides per day. As the tide rises, the tidal current moves northward, taking enough time that part of the river can be at high tide while another part can be at the bottom of its low tide. Strong tides make parts of New York Harbor difficult and dangerous to navigate. During the winter, ice floes may drift south or north, depending upon

2280-758: The Harlem River Ship Canal connecting to the Harlem River ), the east bank of the river becomes Manhattan . The river is sometimes still called the North River from this point south. The George Washington Bridge crosses the river between Fort Lee and the Washington Heights neighborhood of Manhattan. The Lincoln Tunnel and the Holland Tunnel also cross under the river between Manhattan and New Jersey. South of

2375-471: The Hudson Valley , flowing along the west bank of Albany and the east bank of Rensselaer . Interstate 90 crosses the Hudson into Albany at this point in the river. The Hudson then leaves the Capital District, forming the boundary between Greene and Columbia Counties. It then meets its confluence with Schodack Creek, widening considerably at this point. After flowing by Hudson , the river forms

2470-706: The Mahicannittuk by the Mohicans, Ka'nón:no by the Mohawks, and Muhheakantuck by the Lenape. The river was subsequently named after Henry Hudson , an Englishman sailing for the Dutch East India Company who explored it in 1609, and after whom Hudson Bay in Canada is also named. It had previously been observed by Italian explorer Giovanni da Verrazzano sailing for King Francis I of France in 1524, as he became

2565-553: The Mohawk River , the largest tributary of the Hudson River, in Waterford . The river then reaches the Federal Dam in Troy , marking an impoundment of the river. At an elevation of 2 feet (0.61 m), the bottom of the dam marks the beginning of the tidal influence in the Hudson as well as the beginning of the lower Hudson River. South of the Federal Dam, the Hudson River begins to widen considerably. The river enters

2660-560: The New York Harbor between New York City and Jersey City , eventually draining into the Atlantic Ocean at Upper New York Bay . The river serves as a physical boundary between the states of New Jersey and New York at its southern end. Farther north, it marks local boundaries between several New York counties . The lower half of the river is a tidal estuary , deeper than the body of water into which it flows, occupying

2755-669: The Saint Lawrence Seaway . Further south the Hudson takes in water from the Batten Kill River and Fish Creek near Schuylerville . The river then forms the boundary between Saratoga and Rensselaer counties. The river then enters the heart of the Capital District . It takes in water from the Hoosic River , which extends into Massachusetts . Shortly thereafter the river has its confluence with

2850-636: The St. Lawrence Seaway , and then British cities such as Montreal to the Hudson River and New York City. Another major canal was the Oswego Canal , which connected the Erie Canal to Oswego and Lake Ontario , and could be used to bypass Niagara Falls. The Cayuga-Seneca Canal connected the Erie Canal to Cayuga Lake and Seneca Lake . Farther south, the Delaware and Hudson Canal was built between

2945-633: The United States Geological Survey (USGS). USGS maps show the longest source of the Hudson as the Opalescent on the western slopes of Little Marcy Mountain, originating two miles north of Lake Tear of the Clouds. Using river names as seen on maps, Indian Pass Brook flows into Henderson Lake . The outlet of Henderson Lake is most commonly referred to as the official start of the Hudson River, as it flows east and meets

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3040-422: The cytochrome P450 enzyme. Like many lipophilic toxins, PCBs undergo biomagnification and bioaccumulation primarily due to the fact that they are easily retained within organisms. Plastic pollution, specifically microplastics , are a major contributor of PCBs into the biosphere and especially into marine environments. PCBs concentrate in marine environments because freshwater systems, like rivers, act as

3135-730: The 1800s. One of the most significant canals of this era was the Erie Canal . The canal was built to link the Midwest to the Port of New York , a significant seaport during that time, by way of the Great Lakes , the canal, the Mohawk River , and the Hudson River. The completion of the canal enhanced the development of the American West, allowing settlers to travel west, send goods to markets in frontier cities, and export goods via

3230-521: The 1960s, when a host of problems were identified. With the discovery of PCBs' environmental toxicity , and classification as persistent organic pollutants , their production was banned for most uses by United States federal law on January 1, 1978. The International Agency for Research on Cancer (IARC) rendered PCBs as definite carcinogens in humans. According to the U.S. Environmental Protection Agency (EPA), PCBs cause cancer in animals and are probable human carcinogens. Moreover, because of their use as

3325-609: The Algonquians called wigwams , though large families often lived in longhouses that could be a hundred feet long. At the associated villages, they grew corn, beans, and squash. They also gathered other types of plant foods, such as hickory nuts and many other wild fruits and tubers. In addition to agriculture, the Algonquians also fished in the Hudson River, focusing on various species of freshwater fish, as well as various variations of striped bass , American eels , sturgeon , herring , and shad . Oyster beds were also common on

3420-699: The Battery , the river proper ends, meeting the East River to form Upper New York Bay, also known as New York Harbor . Its outflow continues through the Narrows between Brooklyn and Staten Island , under the Verrazzano Bridge , and into Lower New York Bay and the Atlantic Ocean through the Hudson Canyon . The lower Hudson is a tidal estuary, with tidal influence extending as far as

3515-606: The British, who had invaded the largely-defenseless New Amsterdam. New Amsterdam and the colony of New Netherland were renamed New York, after the Duke of York . Under British colonial rule, the Hudson Valley became an agricultural hub. Manors were developed on the east side of the river, and the west side contained many smaller and independent farms. In 1754, the Albany Plan of Union was created at Albany City Hall on

3610-619: The English and the Dutch over control of the river and colony. During the 18th century, the river valley and its inhabitants were the subject and inspiration of Washington Irving , the first internationally acclaimed American author. In the nineteenth century, the area inspired the Hudson River School of landscape painting , an American pastoral style, as well as the concepts of environmentalism and wilderness . The Hudson River

3705-515: The Hudson Fjord , an inlet that formed during the most recent period of North American glaciation , estimated at 26,000 to 13,300 years ago. Even as far north as the city of Troy , the flow of the river changes direction with the tides. The Hudson River runs through the Munsee , Lenape , Mohican , Mohawk , and Haudenosaunee homelands. Prior to European exploration, the river was known as

3800-564: The Hudson River and New York City. The completion of the canal made New York City one of the most vital ports in the nation, surpassing the Port of Philadelphia and ports in Massachusetts . After the completion of the Erie Canal, smaller canals were built to connect it with the new system. The Champlain Canal was built to connect the Hudson River near Troy to the southern end of Lake Champlain. This canal allowed boaters to travel from

3895-652: The Hudson River from terminating via the Narrows. At that time, the Hudson River emptied into the Atlantic Ocean through a more westerly course through parts of present-day northern New Jersey, along the eastern side of the Watchung Mountains to Bound Brook, New Jersey and then on into the Atlantic Ocean via Raritan Bay . A buildup of water in the Upper New York Bay eventually allowed the Hudson River to break through previous land mass that

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3990-427: The Hudson River, and would later become Kingston. Fort Orange was founded on the river north of Wiltwyck, and later became known as Albany. The Dutch West India Company operated a monopoly on the region for roughly twenty years before other businessmen were allowed to set up their own ventures in the colony. In 1647, Director-General Peter Stuyvesant took over management of the colony, and surrendered it in 1664 to

4085-468: The Hudson and a metal chain between the two. In 1777, Washington expected the British would attempt to control the Hudson River, however they instead conquered Philadelphia, and left a smaller force in New York City, with permission to strike the Hudson Valley at any time. The British attacked on October 5, 1777, in the Battle of Forts Clinton and Montgomery by sailing up the Hudson River, looting

4180-677: The Hudson. The plan allowed the colonies to treaty with the Iroquois and provided a framework for the Continental Congress . During the American Revolutionary War , the British realized that the river's proximity to Lake George and Lake Champlain would allow their navy to control the water route from Montreal to New York City. British general John Burgoyne planned the Saratoga campaign , to control

4275-484: The Langerack by the Dutch. An embellished (and partly erroneous) list of "The Old Reaches" was published in a tourist guidebook for steamboat passengers in the nineteenth century. The source of the Hudson River is Henderson Lake , located in the Adirondack Mountains at an elevation of 4,322 ft (1,317 m). However, the photogenic Lake Tear of the Clouds is more conventionally cited in popular culture as

4370-649: The Mohawk River, drain an area of 13,000 square miles (34,000 km ), the Hudson River Watershed. It covers much of New York, as well as parts of Connecticut, Massachusetts, New Jersey, and Vermont. Parts of the Hudson River form coves , such as Weehawken Cove in the towns of Hoboken and Weehawken in New Jersey. The City of Poughkeepsie and several adjacent communities in the mid-Hudson valley, totalling about 100,000 people, rely on

4465-513: The PCB metabolism in the liver of four sea turtle species (green, olive ridley , loggerhead and hawksbill), green and hawksbill sea turtles have noticeably higher hydroxylation rates of PCB 52 than olive ridley or loggerhead sea turtles. This is because the green and hawksbill sea turtles have higher P450 2-like protein expression. This protein adds three hydroxyl groups to PCB 52, making it more polar and water-soluble. P450 3-like protein expression that

4560-448: The U.S., de-dusting agents, waterproofing compounds, casting agents. It was also used as a plasticizer in paints and especially "coal tars" that were used widely to coat water tanks, bridges and other infrastructure pieces. Modern sources include pigments , which may be used in inks for paper or plastic products. PCBs are also still found in old equipment like capacitors, ballasts, X-ray machine, and other e-waste. PCBs have entered

4655-979: The US EPA enforced the federal ban as of 1978, PCBs continued to create health problems in later years through their continued presence in soil and sediment, and from products which were made before 1979. In 1988, Japanese scientists Tanabe et al. estimated 370,000 tons were in the environment globally, and 780,000 tons were present in products, landfills, and dumps or kept in storage. The compounds are pale-yellow viscous liquids . They are hydrophobic, with low water solubilities : 0.0027–0.42  ng /L for Aroclors brand , but they have high solubilities in most organic solvents , oils, and fats . They have low vapor pressures at room temperature. They have dielectric constants of 2.5–2.7, very high thermal conductivity , and high flash points (from 170 to 380 °C). The density varies from 1.182 to 1.566 g/cm . Other physical and chemical properties vary widely across

4750-450: The US, Aroclor 1260 and Aroclor 1254 were the main mixtures used before 1950; Aroclor 1242 was the main mixture used in the 1950s and 1960s until it was phased out in 1971 and replaced by Aroclor 1016. One estimate (2006) suggested that 1 million tonnes of PCBs had been produced. 40% of this material was thought to remain in use. Another estimate put the total global production of PCBs on

4845-510: The atmosphere, PCBs may be degraded by hydroxyl radicals , or directly by photolysis of carbon–chlorine bonds (even if this is a less important process). Atmospheric concentrations of PCBs tend to be lowest in rural areas, where they are typically in the picogram per cubic meter range, higher in suburban and urban areas, and highest in city centres, where they can reach 1  ng /m or more. In Milwaukee , an atmospheric concentration of 1.9 ng/m has been measured, and this source alone

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4940-517: The average PCB concentrations in the blubber were approximately four times higher than the liver; however, this result is most likely age- and sex-dependent. As reproductively active females transferred PCBs and other poisonous substances to the fetus, the PCB concentrations in the blubber were significantly lower than males of the same body length (less than 13 meters). The toxicity of PCBs varies considerably among congeners . The coplanar PCBs, known as nonortho PCBs because they are not substituted at

5035-399: The average daily water temperature was above 20 °C, persistent PCBs had halflives of 67 days. The main excretion processes were fecal egestion, growth dilution and loss across respiratory surfaces. The excretion rate of PCBs matched with the perch's natural bioenergetics , where most of their consumption, respiration and growth rates occur during the late spring and summer. Since the perch

5130-738: The boundary between Orange and Dutchess Counties. It flows between Newburgh and Beacon and under the Newburgh Beacon Bridge , taking in the Fishkill Creek . In this area, between Gee's Point at the US Military Academy and Constitution Island , an area known as "World's End" marks the deepest part of the Hudson, at 202 feet (62 m). Shortly thereafter, the river enters the Hudson Highlands between Putnam and Orange Counties, flowing between mountains such as Storm King Mountain , Breakneck Ridge , and Bear Mountain . The river narrows considerably here before flowing under

5225-485: The boundary between Ulster and Columbia Counties and Ulster and Dutchess Counties, passing Germantown and Kingston . The Delaware and Hudson Canal meets the river at this point. The river then flows by Hyde Park , former residence of Franklin D. Roosevelt , and alongside the city of Poughkeepsie , flowing under the Walkway over the Hudson and the Mid-Hudson Bridge . Afterwards, the Hudson passes Wappingers Falls and takes in Wappinger Creek . The river then forms

5320-452: The class. As the degree of chlorination increases, melting point and lipophilicity increase, and vapour pressure and water solubility decrease. PCBs do not easily break down or degrade, which made them attractive for industries. PCB mixtures are resistant to acids, bases, oxidation, hydrolysis, and temperature change. They can generate extremely toxic dibenzodioxins and dibenzofurans through partial oxidation. Intentional degradation as

5415-414: The easternmost regions of Slovakia. Although deliberate production of PCBs is banned by international treaty, significant amounts of PCBs are still being "inadvertently" produced. Research suggests that 45,000 tons of 'by-product' PCBs are legally produced per year in the US as part of certain chemical and product formulations. Commercial production of PCBs was banned in the United States in 1979, with

5510-425: The environment through both use and disposal. The environmental fate of PCBs is complex and global in scale. Because of their low vapour pressure , PCBs accumulate primarily in the hydrosphere , despite their hydrophobicity , in the organic fraction of soil , and in organisms including the human body. The hydrosphere is the main reservoir. The immense volume of water in the oceans is still capable of dissolving

5605-452: The first European known to have entered the Upper New York Bay , but he considered the river to be an estuary. The Dutch called the river the North River , and they called the present-day Delaware River the South River , which formed the spine of the Dutch colony of New Netherland . Settlements of the colony clustered around the Hudson, and its strategic importance as the gateway to the American interior led to years of competition between

5700-463: The following names: Brazil Czech Republic and Slovakia France Germany Italy Japan Former USSR United Kingdom United States The only North American producer, Monsanto Company , marketed PCBs under the trade name Aroclor from 1930 to 1977. These were sold under trade names followed by a four-digit number. In general, the first two digits refer to the product series as designated by Monsanto (e.g. 1200 or 1100 series);

5795-475: The formula C 12 H 10 , sometimes written (C 6 H 5 ) 2 . In PCBs, some of the hydrogen atoms in biphenyl are replaced by chlorine atoms. There are 209 different chemical compounds in which one to ten chlorine atoms can replace hydrogen atoms. PCBs are typically used as mixtures of compounds and are given the single identifying CAS number 1336-36-3 . About 130 different individual PCBs are found in commercial PCB products. Toxic effects vary depending on

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5890-423: The hamlet of North River , and takes in the Schroon River at Warrensburg . Further south, the river forms the boundary between Warren and Saratoga Counties. The river then takes in the Sacandaga River from the Great Sacandaga Lake . Shortly thereafter, the river leaves the Adirondack Park, flows under Interstate 87 , and through Glens Falls , just south of Lake George although receiving no streamflow from

5985-421: The interior of the Northeast to the coast. Hundreds of factories were built around the Hudson, in towns including Poughkeepise, Newburgh, Kingston, and Hudson. The North Tarrytown Assembly (later owned by General Motors ), on the river in Sleepy Hollow, was a large and notable example. The River links to the Erie Canal and Great Lakes, allowing manufacturing in the Midwest, including automobiles in Detroit, to use

6080-429: The lake. It next goes through Hudson Falls . At this point the river forms the boundary between Washington and Saratoga Counties. Here the river has an elevation of 200 feet (61 m). Just south in Fort Edward , the river reaches its confluence with the Champlain Canal , which historically provided boat traffic between New York City and Montreal and the rest of Eastern Canada via the Hudson, Lake Champlain and

6175-415: The latter 20th century have begun to improve water quality, and restoration work has continued in the 21st century. The river was called Ka’nón:no or Ca-ho-ha-ta-te-a ("the river") by the Haudenosaunee , and it was known as Muh-he-kun-ne-tuk ("river that flows two ways" or "waters that are never still" ) or Mahicannittuk by the Mohican nation who formerly inhabited both banks of

6270-401: The lower portion of the river. The meaning of the Mohican name comes from the river's long tidal range. The Delaware Tribe of Indians (Bartlesville, Oklahoma) considers the closely related Mohicans to be a part of the Lenape people, and so the Lenape also claim the Hudson as part of their ancestral territory, also calling it Muhheakantuck . The first known European name for the river

6365-403: The most likely to leave the organism. However, some metabolites of PCBs containing ortho – meta protons have increased steric hindrance from the oxygen, causing increased stability and an increased chance of accumulation. Metabolism is also dependent on the species of organism; different organisms have slightly different P450 enzymes that metabolize certain PCBs better than others. Looking at

6460-418: The most successful painters of the school. At the beginning of the 19th century, transportation from the US east coast into the mainland was difficult. Ships were the fastest vehicles at the time, as trains were still being developed and automobiles were roughly a century away. In order to facilitate shipping throughout the country's interior, numerous canals were constructed between internal bodies of water in

6555-414: The mouth of the river. The deeply eroded old riverbed beyond the current shoreline, Hudson Canyon , is a rich fishing area. The former riverbed is clearly delineated beneath the waters of the Atlantic Ocean, extending to the edge of the continental shelf . As a result of the glaciation and the rising sea levels , the lower half of the river is now a tidal estuary that occupies the Hudson Fjord. The fjord

6650-411: The naming system is Aroclor 1016 which was produced by distilling 1242 to remove the highly chlorinated congeners to make a more biodegradable product. "1016" was given to this product during Monsanto's research stage for tracking purposes but the name stuck after it was commercialized. Different Aroclors were used at different times and for different applications. In electrical equipment manufacturing in

6745-415: The narrow, meandering stretches as racks , or reaches. These names included the four "lower reaches" through the Hudson Highlands (Seylmakers rack, Cocks rack, Hoogh rack, and Vosserack) plus the four "upper reaches" from Inbocht Bay to Kinderhook (Backers rack, Jan Pleysiers rack, Klevers rack, and Harts rack). A ninth reach was described as "the long reach" by the Englishman Robert Juet and designated as

6840-521: The order of 1.5 million tonnes. The United States was the single largest producer with over 600,000 tonnes produced between 1930 and 1977. The European region follows with nearly 450,000 tonnes through 1984. It is unlikely that a full inventory of global PCB production will ever be accurately tallied, as there were factories in Poland, East Germany, and Austria that produced unknown amounts of PCBs. As of 2002 , there were still 21,500 tons of PCBs stored in

6935-611: The passage of the Toxic Substances Control Act (TSCA). The utility of PCBs is based largely on their chemical stability, including low flammability and high dielectric constant. In an electric arc, PCBs generate incombustible gases. Use of PCBs is commonly divided into closed and open applications. Examples of closed applications include coolants and insulating fluids ( transformer oil ) for transformers and capacitors , such as those used in old fluorescent light ballasts, and hydraulic fluids considered

7030-462: The remaining wilderness, which was fast disappearing from the Hudson Valley just as it was coming to be appreciated for its qualities of ruggedness and sublimity . The school characterizes the artistic body, its New York location, its landscape subject matter, and often its subject, the Hudson River. In general, Hudson River School artists believed that nature in the form of the American landscape

7125-420: The ring positions ortho to (next to) the other ring, (such as PCBs 77, 126 and 169), tend to have dioxin -like properties, and generally are among the most toxic congeners. Because PCBs are almost invariably found in complex mixtures, the concept of toxic equivalency factors ( TEFs ) has been developed to facilitate risk assessment and regulation, where more toxic PCB congeners are assigned higher TEF values on

7220-469: The rings. Phase I reactions occur by adding an oxygen to either of the benzene rings by Cytochrome P450 . The type of P450 present also determines where the oxygen will be added; phenobarbital (PB)-induced P450s catalyze oxygenation to the meta-para positions of PCBs while 3-methylcholanthrene (3MC)-induced P450s add oxygens to the ortho – meta positions. PCBs containing ortho – meta and meta – para protons can be metabolized by either enzyme, making them

7315-507: The river and therefore cut off the patriot hub of New England (to the river's east) from the South and Mid-Atlantic regions to the river's west. The action would allow the British to focus on rallying the support of loyalists in the southerly states. As a result, numerous battles were fought along the river and in nearby waterways. These include the Battle of Long Island , in August 1776 and

7410-634: The river floor, which provided an extra source of nutrition. Land hunting consisted of turkey, deer, bear, and other animals. The lower Hudson River was inhabited by the Lenape, while further north, the Wappingers lived from Manhattan Island up to Poughkeepsie . They traded with both the Lenape to the south and the Mahicans to the north. The Mahicans lived in the northern part of the valley from present-day Kingston to Lake Champlain , with their capital located near present-day Albany . John Cabot

7505-501: The river for their drinking water. New York Harbor, between the Narrows and the George Washington Bridge, has a mix of fresh and ocean water, mixed by wind and tides to create an increasing gradient of salinity from the river's top to its bottom. This varies with season, weather, variation of water circulation, and other factors; snowmelt at winter's end increases the freshwater flow downstream. The salt line of

7600-553: The river for transport. With industrialization came new technologies for transport, including steamboats for faster transport. In 1807, the North River Steamboat (later known as Clermont), became the first commercially successful steamboat. It carried passengers between New York City and Albany along the Hudson River. Polychlorinated biphenyl Because of their longevity, PCBs are still widely in use, even though their manufacture has declined drastically since

7695-528: The river varies from the north in Poughkeepsie to the south at Battery Park in New York City, though it usually lies near Newburgh. The Hudson is sometimes called, in geological terms, a drowned river . The rising sea levels after the retreat of the Wisconsin glaciation , the most recent ice age , have resulted in a marine incursion that drowned the coastal plain and brought salt water well above

7790-461: The second two numbers indicate the percentage of chlorine by mass in the mixture. Thus, Aroclor 1260 is a 1200 series product and contains 60% chlorine by mass. It is a myth that the first two digits referred to the number of carbon atoms; the number of carbon atoms do not change in PCBs. The 1100 series was a crude PCB material which was distilled to create the 1200 series PCB product. The exception to

7885-474: The source of the Hudson. The river is named Feldspar Brook from where it emerges from Lake Tear of the Clouds until its confluence with the Opalescent River , after which it becomes the Opalescent until it reaches Calamity Brook flowing southward into the eastern outlet of Henderson Lake. After this point, the stream is known as the Hudson River according to the cartographical definition used by

7980-676: The southwest flowing Calamity Brook. The confluence of the two rivers however is where most maps begin to use the Hudson River name on a cartographical basis. South of the outlet of Sanford Lake, the Opalescent River flows into the Hudson. The Hudson then flows south, taking in Beaver Brook and the outlet of Lake Harris. After its confluence with the Indian River, the Hudson forms the boundary between Essex and Hamilton counties. The Hudson flows entirely into Warren County in

8075-515: The specific PCB. In terms of their structure and toxicity, PCBs fall into two distinct categories, referred to as coplanar or non- ortho -substituted arene substitution patterns and noncoplanar or ortho -substituted congeners. Di- ortho -substituted, non-coplanar PCBs interfere with intracellular signal transduction dependent on calcium which may lead to neurotoxicity . ortho -PCBs can disrupt thyroid hormone transport by binding to transthyretin . Commercial PCB mixtures were marketed under

8170-605: The state line with New Jersey the west bank of the Hudson enters Bergen County . The Palisades are large, rocky cliffs along the west bank of the river; also known as Bergen Hill at their lower end in Hudson County . Further south the east bank of the river becomes Yonkers and then the Riverdale neighborhood of the Bronx in New York City. South of the confluence of the Hudson and Spuyten Duyvil Creek (subsumed by

8265-500: The tides. The Mahican name of the river represents its partially estuarine nature: muh-he-kun-ne-tuk means "the river that flows both ways." Due to tidal influence from the ocean extending to Troy, NY, freshwater discharge is only about 17,400 cubic feet (490 m ) per second on average. The mean fresh water discharge at the river's mouth in New York is approximately 21,900 cubic feet (620 m ) per second. The Hudson River

8360-413: The vicinity of present-day Albany, reaching an end to navigation. The Dutch subsequently began to colonize the region, establishing the colony of New Netherland , including three major fur-trading outposts: New Amsterdam , Wiltwyck , and Fort Orange . New Amsterdam was founded at the mouth of the Hudson River, and would later become known as New York City . Wiltwyck was founded roughly halfway up

8455-646: The village of Peekskill and capturing the two forts. In 1778, the Continentals constructed the Great West Point Chain in order to prevent another British fleet from sailing up the Hudson. Hudson River School paintings reflect the themes of discovery, exploration, and settlement in America in the mid-19th century. The detailed and idealized paintings also typically depict a pastoral setting. The works often juxtapose peaceful agriculture and

8550-456: Was also the eastern outlet for the Erie Canal , which, when completed in 1825, became an important transportation artery for the early 19th century United States. Pollution in the Hudson River increased in the 20th century, more acutely by mid-century, particularly with industrial contamination from polychlorinated biphenyls , also known by their acronym PCBs. Pollution control regulations, enforcement actions and restoration projects initiated in

8645-516: Was an ineffable manifestation of God, though the artists varied in the depth of their religious conviction. Their reverence for America's natural beauty was shared with contemporary American writers such as Henry David Thoreau and Ralph Waldo Emerson . The artist Thomas Cole is generally acknowledged as the founder of the Hudson River School , his work first being reviewed in 1825, while painters Frederic Edwin Church and Albert Bierstadt were

8740-435: Was connecting Staten Island and Brooklyn to form the Narrows as it exists today. This allowed the Hudson River to find a shorter route to the Atlantic Ocean via its present course between New Jersey and New York City. Suspended sediments, mainly consisting of clays eroded from glacial deposits and organic particles, can be found in abundance in the river. The Hudson has a relatively short history of erosion, so it does not have

8835-480: Was estimated to account for 120 kg/year of PCBs entering Lake Michigan . In 2008, concentrations as high as 35  ng /m , 10 times higher than the EPA guideline limit of 3.4 ng/m , have been documented inside some houses in the U.S. Volatilization of PCBs in soil was thought to be the primary source of PCBs in the atmosphere, but research suggests ventilation of PCB-contaminated indoor air from buildings

8930-1040: Was the Rio San Antonio as named by the Portuguese explorer in Spain's employ, Estêvão Gomes , who explored the Mid-Atlantic coast in 1525. Another early name for the Hudson used by the Dutch was Rio de Montaigne . Later, they generally termed it the Noortrivier , or " North River ", the Delaware River being known as the Zuidrivier , or "South River". Other occasional names for the Hudson included Manhattes rieviere "Manhattan River", Groote Rivier "Great River", and de grootte Mouritse reviere , or "the Great Maurits River" (after Maurice, Prince of Orange ). The translated name North River

9025-583: Was used in the New York metropolitan area up until the early 1900s, with limited use continuing into the present day. The term persists in radio communication among commercial shipping traffic, especially below the Tappan Zee . The term also continues to be used in names of facilities in the river's southern portion, such as the North River piers , North River Tunnels , and the North River Wastewater Treatment Plant . It

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