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Tryptophan or Trp is an amino acid that is used in the biosynthesis of proteins. 3d illustration

crystaline Barite or Barytes mineral sample- clear or translucent dense mineral collected from the UK

aquamarine crystal on matrix from Afghanistan isolated on white background

pyrrhotite iron sulfide rare earth mineral

A model of a molecule of Afatinib, also known as Gilotrif or Tovok. It is used as a treatment for lung cancer.

Close up piece of raw marble. Macro shooting of metamorphic rock specimens - marble stone

blooming viburnum tree in sunny day with clusters of white flowers, close-up

Cefazolin, cefazoline, cephazolin molecule. It is s beta-lactam antibiotic, first-generation cephalosporin. Molecular model. 3D rendering. 3D illustration

Blackboard with the chemical formula of Cortisone

macro shooting of natural rock specimen - black Spinel crystal on black diopside gemstone isolated on white background

$Cornus alba 'Bud's Yellow'\nSmall flowers on a young dogwood in springtime in Metro Vancouver.\n\nPlant Hardiness Zone 8A.$

Venlafaxine (Efexor, Effexor and Trevilor) is an antidepressant of the serotonin-norepinephrine reuptake inhibitor (SNRI) class

chinese medicine Belamcanda chinecsis rhizoma belamcandae, Pardanthus, blackberry lily on black background

handful of yellow medical capsules on dark green plain background,

$Deciduous shrub to 4m, with arching branches; bark grey, pith reddish-brown. leaflets 3-7 oval to elliptical, pointed, sharply toothed, hairless, though often slightly hairy when young. Flowers creamy-white, in dense pyramidal panicles, 3-6cm across; anthers yellowish-white. Ripe berry shiny and scarlet-red, globose.\nHabitat: Mountain woods and shady rock places, to 2050m.\nFlowering Season: April-June.\nDistribution: West Europe.$

White snow isolated on black background close up

Periodic table detail for the elements hafnium and tantalum. Image uses an altered public domain periodic table as the source document. Part of a series covering all the elements

Man with handful of white dry sand in her hands, spilling sand through fingers on black background. Concept of flow of life. Close up of grains of pure natural mineral quartz.

$Close-up of word \$

multi connect 3d render illustration glass

macro shooting of natural rock specimen - piece of Stichtite mineral gemstone isolated on white background

Mahonia japonica is an evergreen shrub, which has been extensively cultivated in Japan and is commonly called Japanese mahonia, although it is native to China. Fragrant yellow flowers in loose, spreading to pendant racemes bloom in late winter to early spring (March-April). Flowers are followed by ornamentally attractive grape-like bunches of small waxy fruits which mature to blue-black in late spring to early summer.

Adipic acid or hexanedioic acid is the organic compound. 3d illustration

Free Images: "bestof:Hydroxylammonium chloride.png Chemical structure of w Hydroxylammonium chloride Own 2007-11-01 Shoy Public domain Comments High-resolution black/white PNG made"

Odocoileus_virginianus,_2016-11-12-19.59.jpg

bee_09856e08,m,_thailand,_angle_2014-08-09-11.19.21_ZS_PMax.jpg

bee_09856e08,m,_thailand,_tool_2014-08-09-12.06.33_ZS_PMax.jpg

bee_09856e08,m,_thailand,_face_2014-08-09-11.29.35_ZS_PMax.jpg

bee_09856e08,m,_thailand,_side_2014-08-09-11.53.12_ZS_PMax.jpg

bee_small_red_tip,_f,_chile,_side_2014-08-08-17.43.13_ZS_PMax.jpg

bee_small_red_tip,_f,_chile,_face_2014-08-08-17.31.24_ZS_PMax.jpg

bee_small_red_tip,_f,_chile,_angle_2014-08-08-17.22.49_ZS_PMax.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

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Dendrobium_junceum._An_epiphytic_orchid_native_to_Borneo_and_the_Philippines.png

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Blue_Iris_on_Black_3._Iris_germanica_(Blue_Iris)_with_a_dragonfly_and_beetle._Bodycolour_on_prepared_black_ground_on_vellum,_surrounded_by_gold_border._(Johann_Cristoph_Dietzsch,_1710-1769).png

Small black structure on narrow ground between ponds for wildlife observation and duck blind.jpg

Ruby_2015-08-07-18.04.36_ZS_PMax_UDR.jpg

Cathédrale de Tours - verrière de Saint Martin 1.jpg

Beacon Falls sneakers, children's, made by Beacon Falls Rubber Company of Connecticut, c. 1900 - Bata Shoe Museum - DSC00735.JPG

Music Cabinet by unknown Cincinnati maker, c. 1875-1890, American black walnut and brass - Cincinnati Art Museum - DSC03045.JPG

copper_oxide,_Helen_Folger_2015-08-07-13.52.41_ZS_PMax_UDR.jpg

Fluorite,_Helen_Folger,_with_foil_2015-08-07-17.50.41_ZS_PMax_UDR.jpg

Stalactites_Stalagmites,_End,_VT,_Jefferson_Memorial_2015-08-07-12.12.07_ZS_PMax_UDR.jpg

Sultan_Ulmar_Ali_Saifuddien_Mosque.Brunei..jpg

Anthophora_dalmatica,_F,_Side,_Greece,_Aegean_Islands_2014-12-09-17.33.49_ZS_PMax.jpg

Naked human male body front anterior.png

2016.09_-_Amsterdam_photo_of_Urban_nature_-_a_coot_nest_in_the_canals_of_Amsterdam_city;_-_geotagged_free_urban_picture,_in_public_domain_Commons;_Dutch_photography,_Fons_Heijnsbroek,_The_Netherlands.jpg

Anthophora_dalmatica,_F,_Face,_Greece,_Aegean_Islands_2014-12-09-17.26.17_ZS_PMax.jpg

Megachile_petulans,_f,_left_side,_Charleston_Co.,_SC_2016-09-02-17.22.jpg

Palaeorhiza_species,_f,_Papau_New_Guinea,_back_2014-11-01-22.26.45_ZS_PMax.jpg

Osmia_spinigera,_f,_west_bank,_side_2014-08-08-10.20.06_ZS_PMax.jpg

Anthophora_dalmatica,_F,_Back,_Greece,_Aegean_Islands_2014-12-09-17.17.41_ZS_PMax.jpg

Megachile_species,_f,_15266b06,_face,_kenya_2014-08-06-16.10.44_ZS_PMax.jpg

Palaeorhiza_species,_f,_Papau_New_Guinea,_side_2014-11-01-22.42.16_ZS_PMax.jpg

Palaeorhiza_species,_f,_Papau_New_Guinea,_face_2014-11-01-22.33.28_ZS_PMax.jpg

Pauline_Clyburn,_rehabilitation_client_at_Manning,_Clarendon..._(3109745797).jpg

Alice_Manfield_-_Guide_Alice,_Mt_Buffalo,_c1900-30,_SLV.jpg

bald_faced_hornet,_nest,_beltsville,_pg_county_2014-08-29-17.44.13_ZS_PMax.jpg

bald_faced_hornet,_nest_5x,_beltsville,_prince_georges_county_2014-08-29-17.33.33_ZS_PMax.jpg

Mink,_M,_Foot,_top,_MD,_PG_County,_Bowie_2015-03-03-12.08.53_ZS_PMax.jpg

Stemonitis_sp_2014-07-01-15.09.12_ZS_PMax.jpg

Phenocolletes_,_f,_australia,_face_2014-10-11-19.59.10_ZS_PMax.jpg

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Phenocolletes_,_f,_australia,_side_2014-10-11-20.11.36_ZS_PMax.jpg

Andrena_bradleyi,_f,_right_side,_Maryland_2016-04-07-15.18.jpg

Andrena_bradleyi,_f,_face,_Maryland_2016-04-07-14.58.jpg

Andrena_bradleyi,_f,_back_2,_Maryland_2016-04-07-14.41.jpg

Heriades_carinata,_f,_side,_Prince_George's_Co,_MD_2016-04-15-22.16.jpg

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Hylaeus_pictipes,_f,_back,_Crawford_Co.,_PA_2016-11-11-15.57.jpg

Hylaeus_pictipes,_m,_face,_Crawford_Co.,_PA_2016-11-11-16.43.jpg

Hylaeus_pictipes,_m,_left_side,_Crawford_Co.,_PA_2016-11-11-17.00.jpg

Hylaeus_pictipes,_f,_face,_Crawford_Co.,_PA_2016-11-11-16.04.jpg

Melissodes_lustra,_F,_Back,_CA,_Santa_Barbara_County_2014-06-17-16.24.12_ZS_PMax.jpg

Melissodes_lustra,_F,_Face,_CA,_Santa_Barbara_County_2014-06-17-15.43.30_ZS_PMax.jpg

Melissodes_lustra,_F,_Side,_CA,_Santa_Barbara_County_2014-06-17-16.35.30_ZS_PMax.jpg

Mink,_M,_Foot,_toe_pad,_MD,_PG_County,_Bowie_2015-03-03-11.57.46_ZS_PMax.jpg

Mink,_M,_Foot,_toe_pads,_MD,_PG_County,_Bowie_2015-03-03-12.02.23_ZS_PMax.jpg