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Melatonin is a hormone, released primarily by the pineal gland, that regulates the sleep–wake cycle. 3D ball-and-stick model, white background

Folic acid, folate molecule. It is known as vitamin B9. Molecular model. 3D rendering. Illustration

Microcrystalline wax with chemical formula on white laboratory table.

A molecular model of the plasticizer Dibutyl Phthalate or DBP. As a plasticizer it has been used in many products including adhesives, textiles, cosmetics and children's toys. There are now concerns about its health effects, particularly its effect on male health and behaviour. Isolated on white.

Vitamin B1. Thiamine molecule on paper texture background. Skeletal formula of vitamin b1. Recessed text in green and yellow.

Prednisone is a glucocorticoid medication mostly used to suppress the immune system and decrease inflammation in conditions such as asthma, COPD, and rheumatologic diseases.

Chemical formula of Uric acid on a futuristic background

Molecular structure of Acetone or dimethyl ketone

$3d render of molecular structure of methane, butane, ethane and propane isolated over white background\nAtoms are represented as spheres with color and chemical symbol coding: hydrogen(H) - blue, carbon(C) - red$

29 October Republic Day of Türkiye text on a red shiny sphere with a partial Turkish flag on white background. Easy to crop for all your print sizes and social media needs.

Glucosamine (C6H13NO5) is an amino sugar. treatment for osteoarthritis. Chemical structure model: Ball and Stick. 3D illustration.

Blackboard with the Vela constellation drawn in the middle.

Copper(II) sulfate with molecular structure. Chemical ingredient used in medical and public health issues.

Elbasvir is a drug approved by the FDA for the treatment of hepatitis C.

A ball and stick model of a molecule of gamma-Cyclodextrin. Composed of eight glucose sugar molecules bound into a ring structure, cyclodextrins are easily made from simple starch. The large ring can bind smaller molecules within it, making Cylodextrins useful in drug-delivery applications and also to clean up toxins (such as heavy metals) in the environment. Currently, gamma-Cyclodextrin is being considered as a structure which can bind to and hold carbon dioxide gas for carbon capture and storage as a way to manage the effect of excess carbon dioxide on the climate.

Vitamin A. Retinol 3d molecule on paper texture background. Skeletal formula of vitamin a. Recessed text in green and yellow.

nitric acid in glass, chemical in the laboratory and industry, corrosive chemical

Handwriting Chemical formula of Citric Acid with pen. Close up.

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Dasabuvir is an antiviral medication used in combination with other medications to treat hepatitis C.

Vitamin A(Retinol). Found in food and used as a dietary supplement. 3D illustration. Chemical structure model: Ball and Stick.

Chemical Formula of Cholesterol concept on Blackboard

Free Images: "bestof:Methoxy group.svg Structural formula of a methoxy group Created using http //www acdlabs com/download/chemsk html ACD/ChemSketch 10 0 and Inkscape Own"

Chernabura island Shumagin island group.jpg

A group of pronghorns frolic antilocapra americana.jpg

A group of speedboats in a tournament ride.jpg

A group of four men birdwatch from the sandy shore.jpg

A group of three fishers enjoy the sunset from their canoe.jpg

An event leader speaks to a group of teens during the archery event.jpg

(Portrait_of_James_P._(James_Price)_Johnson,_New_York,_N.Y.(?),_ca._May_1946)_(LOC)_(5354170813).jpg

(Portrait_of_Tony_Pastor_and_Maria_Kramer,_Hotel_Edison(?),_New_York,_N.Y.,_between_1946_and_1948)_(LOC)_(5436422212).jpg

Lasioglossum_occidentale,_F,_Face,_WY,_Lincoln_County_2015-07-07-13.42.10_ZS_PMax_UDR.jpg

Melissodes_communis,_male,_face_2012-06-29-16.10.jpg

Andrena_spiraeana,_f,_back,_Prince_George's_Co,_MD_2016-03-22-10.39.jpg

Nomada_fragariae,_F,_Face,_MD,_PG_County_2015-09-01-14.40.10_ZS_PMax_UDR.jpg

Andrena_spiraeana,_f,_face,_Prince_George's_Co,_MD_2016-03-22-10.53.jpg

Nomioides,_bee_tiny_pretty_wing,_f,_kyrgystan,_angle_2014-08-10-09.12.02_ZS_PMax.jpg

Nomioides,bee_tiny_pretty_wing,_f,_kyrgystan,_face_2014-08-10-09.17.21_ZS_PMax.jpg

Triepeolus_sp101,_m,_right,_Cochise_Co.,_AZ_2016-09-30-18.10.jpg

(Portrait_of_Walter_Hendl,_Tony_Aless,_Billy_Bauer,_Chubby_Jackson,_Don_Lamond,_Woody_Herman,_and_Flip_Phillips,_Carnegie_Hall(?),_New_York,_N.Y.(?),_ca._Apr._1946)_(LOC)_(4843746780).jpg

Megachile_species,_m,_south_africa,_kruger,_back_2016-12-08-17.10.jpg

Xylocopa_viginica,_f,_face,_Prince_George's_Co,_MD_2016-10-20-18.22.jpg

Xylocopa_viginica,_f,_back,_Prince_George's_Co,_MD_2016-10-20-18.11.jpg

People in small discussion group meeting.jpg

A group of people stand birdwatching.jpg

Moose hunting group drags a captured moose.jpg

South America - Blue Marble orthographic.jpg

Group of people enjoying a canoe tour.jpg

A group of children view wildlife near a bridge.jpg

Group of children watching as snow falls.jpg

Group of girl scouts enjoys birdwatching.jpg

Happy group of children playing race.jpg

A group of people enjoy a day in nature.jpg

Group of people walking down the street.jpg

Group of people look through binoculars.jpg

Group of steller sea lions near sea coast.jpg

People working in small group in office.jpg

Chiswell island group gulf of Alaska.jpg

Group of teens practice their archery skills.jpg

Man shows a group of teens a strip of wood.jpg

Group of blow flies congregating on a sign post.jpg

A group of men work on catching an endangered sturgeon.jpg

A group of people on the hill above the coast enjoys.jpg

Group of adults and children enjoy recreational fishing.jpg

Large group of gray seals on beach halichoerus grypus.jpg

People seated at table participating in group discussion during meeting.jpg

Group of walrus animals crammed side by side.jpg

A group of women volunteers helping to replant marsh grass on the refuge.jpg

Older person shows how a watershed works to a group of school children.jpg

Catching fish using electrofishing practice.jpg

Child wading in water while using net.jpg

Group of environmental education science teachers take the tour by canoe on lake.jpg

Anglers using backpack electroshocker to capture fish.jpg

Anglers using electro shock fishing techniques.jpg

Ceratiomyxa_fruticulosa_variety_2,_Poriodes_2014-07-01-10.32.19_ZS_PMax.jpg

Ceratiomyxa_fruticulosa_variety,_Poriodes_2014-07-01-10.46.09_ZS_PMax.jpg

Ancyloscelis_apiformis,_m,_paraguay,_side_2014-08-08-10.09.11_ZS_PMax.jpg

Parque Avenida Building in Paulista Avenue.jpg

Pierre-Auguste_Renoir,_French_-_The_Large_Bathers_-_Google_Art_Project.jpg

(Downbeat, New York, N.Y., ca. 1948) (LOC) (4843742508).jpg

(Portrait of Duke Ellington, William P. Gottlieb's home, Maryland, 1941) (LOC) (4932366128).jpg

Negro_school_children,_Omar,_W._Va._(3109755357).jpg

(Portrait_of_Cozy_Cole,_New_York,_N.Y.(?),_ca._Sept._1946)_(LOC)_(5269515180).jpg