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Pictures, Images and Stock Photos

Browse 4,696 stock photos and images available, or start a new search to explore more stock photos and images.

Pontifical Swiss guards at St. Peter's Basilica stock photo
Pontifical Swiss guards at St. Peter's Basilica stock photo
Pontifical Swiss guards at St. Peter's Basilica

Vatican - August 21, 2009: The Pontifical Swiss Guard is a small force maintained by the Holy See that is responsible for the safety of the Pope, including the security of the Apostolic Palace.

Chemical formula, skeletal formula and 3D ball-and-stick model of nicotinamide adenine dinucleotide, white background stock photo
Chemical formula, skeletal formula and 3D ball-and-stick model of nicotinamide adenine dinucleotide, white background stock photo
Chemical formula, skeletal formula and 3D ball-and-stick model...

Nicotinamide adenine dinucleotide (NAD) is a coenzyme central to metabolism. Found in all living cells, NAD is called a dinucleotide because it consists of two nucleotides joined through their phosphate groups.

An aerial view of Ushaiqer Heritage Village stock photo
An aerial view of Ushaiqer Heritage Village stock photo
An aerial view of Ushaiqer Heritage Village

Ushaiqer Heritage Village is a preserved example of the traditional Arab mud brick architecture and a popular tourist destination.

Chemical formula, skeletal formula and 3D ball-and-stick model of paracetamol (acetaminophen) stock photo
Chemical formula, skeletal formula and 3D ball-and-stick model of paracetamol (acetaminophen) stock photo
Chemical formula, skeletal formula and 3D ball-and-stick model...

A common non-steroid anti-inflammatory drug

The Triumphal Arch stock photo
The Triumphal Arch stock photo
The Triumphal Arch

Brussels, Belgium - July 17, 2018: Erected in 1905, this grand monument in a park features a triple arch topped by a bronze sculpture.

Chemical formula, skeletal formula and 3D ball-and-stick model of antioxidant glutathione stock photo
Chemical formula, skeletal formula and 3D ball-and-stick model of antioxidant glutathione stock photo
Chemical formula, skeletal formula and 3D ball-and-stick model...

Glutathione (GSH) is an antioxidant in plants, animals, fungi, and some bacteria and archaea. White background

Structure of recombinant human lactoferrin with bound iron (light brown) and carbonate (red) produced by transgenic cows stock photo
Structure of recombinant human lactoferrin with bound iron (light brown) and carbonate (red) produced by transgenic cows stock photo
Structure of recombinant human lactoferrin with bound iron (light

3D cartoon model, secondary structure color scheme, PDB 2bjj, white background

A panoramic view of Al Wahbah Crater at sunrise stock photo
A panoramic view of Al Wahbah Crater at sunrise stock photo
A panoramic view of Al Wahbah Crater at sunrise

The crater at the early morning in December

Sandstone formations of Jabal Tuwaiq near Riyadh stock photo
Sandstone formations of Jabal Tuwaiq near Riyadh stock photo
Sandstone formations of Jabal Tuwaiq near Riyadh

abal Tuwaiq is a narrow escarpment that cuts through the plateau of Najd in central Arabia, running approximately 800 km from the southern border of Al-Qasim in the north, to the northern edge of the Empty Quarter desert near Wadi ad-Dawasir in the south.

The Historic Diriyah Fort stock photo
The Historic Diriyah Fort stock photo
The Historic Diriyah Fort

The ruins of the old city of Diriyah lay on either side of the narrow valley known as Wadi Hanifa, which continues southwards through Riyadh and beyond. Consisting almost entirely of mud-brick structures, the ruins are divided into three districts, Ghussaibah, Al-Mulaybeed, and Turaif, set on top of hills overlooking the valley.

The interior and nave of Basilica Cathedral of Saint-Denis, Paris stock photo
The interior and nave of Basilica Cathedral of Saint-Denis, Paris stock photo
The interior and nave of Basilica Cathedral of Saint-Denis, Paris

The Basilica of Saint-Denis became a place of pilgrimage and the burial place of the French Kings with nearly every king from the 10th to the 18th centuries being buried there, as well as many from previous centuries.

Structure of phenylalanine hydroxylase tetramer stock photo
Structure of phenylalanine hydroxylase tetramer stock photo
Structure of phenylalanine hydroxylase tetramer

Phenylalanine hydroxylase (PAH) (EC 1.14.16.1) is an enzyme that catalyzes the hydroxylation of the aromatic side-chain of phenylalanine to generate tyrosine. 3D cartoon and Gaussian surface models, chain id color scheme, based on PDB 2pah, white background.

The Historic Diriyah Fort stock photo
The Historic Diriyah Fort stock photo
The Historic Diriyah Fort

The ruins of the old city of Diriyah lay on either side of the narrow valley known as Wadi Hanifa, which continues southwards through Riyadh and beyond. Consisting almost entirely of mud-brick structures, the ruins are divided into three districts, Ghussaibah, Al-Mulaybeed, and Turaif, set on top of hills overlooking the valley.

Formula and structure of capecitabine stock photo
Formula and structure of capecitabine stock photo
Formula and structure of capecitabine

Chemical formula, structural formula and 3D ball-and-stick model of the anticancer drug capecitabine, white background

Chemical formula, structural formula and 3D ball-and-stick model of L-arginine stock photo
Chemical formula, structural formula and 3D ball-and-stick model of L-arginine stock photo
Chemical formula, structural formula and 3D ball-and-stick model...

Arginine, also known as l-arginine (symbol Arg or R), is an α-amino acid that is used in the biosynthesis of proteins. It contains an α-amino group, an α-carboxylic acid group, and a side chain consisting of a 3-carbon aliphatic straight chain ending in a guanidino group. 3D ball-and-stick model, white background

Chemical formula, structural formula and 3D ball-and-stick model of hormone melatonin stock photo
Chemical formula, structural formula and 3D ball-and-stick model of hormone melatonin stock photo
Chemical formula, structural formula and 3D ball-and-stick model...

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

A narrow street in a traditional Arab mud brick village, Al Majmaah, Saudi Arabia stock photo
A narrow street in a traditional Arab mud brick village, Al Majmaah, Saudi Arabia stock photo
A narrow street in a traditional Arab mud brick village, Al...

The restored streets in the Munikh Castle suburbs

Structure of Favipiravir bound to replicating polymerase complex of SARS-CoV-2 in the pre-catalytic state stock photo
Structure of Favipiravir bound to replicating polymerase complex of SARS-CoV-2 in the pre-catalytic state stock photo
Structure of Favipiravir bound to replicating polymerase complex...

3D cartoon model with active center close-up, based on PDB 7ctt, black background

Structure of cyclin-dependent kinase CDK9 (green) in complex with cyclin T (brown) and a 2-amino-4-heteroaryl-pyrimidine inhibitor. stock photo
Structure of cyclin-dependent kinase CDK9 (green) in complex with cyclin T (brown) and a 2-amino-4-heteroaryl-pyrimidine inhibitor. stock photo
Structure of cyclin-dependent kinase CDK9 (green) in complex...

3D cartoon and Gaussian surface models, PDB 4bci, white background

Chemical formula, skeletal formula and 3D ball-and-stick model of the hormone aldosterone, white background stock photo
Chemical formula, skeletal formula and 3D ball-and-stick model of the hormone aldosterone, white background stock photo
Chemical formula, skeletal formula and 3D ball-and-stick model...

Aldosterone is the main mineralocorticoid steroid hormone produced by the zona glomerulosa of the adrenal cortex in the adrenal gland. It is essential for sodium conservation in the kidney, salivary glands, sweat glands, and colon.

Chemical formula, skeletal formula and 3D ball-and-stick model of adenosine triphosphate (ATP), white background stock photo
Chemical formula, skeletal formula and 3D ball-and-stick model of adenosine triphosphate (ATP), white background stock photo
Chemical formula, skeletal formula and 3D ball-and-stick model...

Adenosine triphosphate (ATP) is an organic compound and hydrotrope that provides energy to drive many processes in living cells.

The Talitsky Stone Bridge, Kaluga stock photo
The Talitsky Stone Bridge, Kaluga stock photo
The Talitsky Stone Bridge, Kaluga

An architectural historical monument and tourist attraction.

Structure of human RECQL5 helicase APO form stock photo
Structure of human RECQL5 helicase APO form stock photo
Structure of human RECQL5 helicase APO form

3D cartoon model, secondary structure color scheme, PDB 5lb8, white background

Chemical formula, skeletal formula, and 3D ball-and-stick model of nucleoside adenosine stock photo
Chemical formula, skeletal formula, and 3D ball-and-stick model of nucleoside adenosine stock photo
Chemical formula, skeletal formula, and 3D ball-and-stick model...

Nucleosides are glycosylamines that can be thought of as nucleotides without a phosphate group.

West facade of the Basilica Cathedral of Saint Denis stock photo
West facade of the Basilica Cathedral of Saint Denis stock photo
West facade of the Basilica Cathedral of Saint Denis

The Basilica of Saint-Denis is a large medieval abbey church in the city of Saint-Denis, now a northern suburb of Paris. The building is of singular importance historically and architecturally as its choir, completed in 1144, shows the first use of all of the elements of Gothic architecture.

Structure of human albumin, 3D cartoon model isolated, white background stock photo
Structure of human albumin, 3D cartoon model isolated, white background stock photo
Structure of human albumin, 3D cartoon model isolated, white...

Albumin is a family of globular proteins, the most common of which are the serum albumins. All the proteins of the albumin family are water-soluble, moderately soluble in concentrated salt solutions, and experience heat denaturation.

King Faisal Specialist Hospital and Research Centre stock photo
King Faisal Specialist Hospital and Research Centre stock photo
King Faisal Specialist Hospital and Research Centre

King Faisal Specialist Hospital and Research Centre is one of the leading medical research centers in Saudi Arabia. December 2019.

A petroglyphic image of humans with anatomical details on the Graffiti Rock (Qaryat al Asba) stock photo
A petroglyphic image of humans with anatomical details on the Graffiti Rock (Qaryat al Asba) stock photo
A petroglyphic image of humans with anatomical details on the...

An archeological site and popular tourist attraction east of Riyadh.

Structure of human prion, 3D cartoon model isolated, white background stock photo
Structure of human prion, 3D cartoon model isolated, white background stock photo
Structure of human prion, 3D cartoon model isolated, white...

Prions are misfolded proteins with the ability to transmit their misfolded shape onto normal variants of the same protein. They characterize several fatal and transmissible neurodegenerative diseases in humans and many other animals.

Structure of human argonaute-1 complexed with let-7 miRNA stock photo
Structure of human argonaute-1 complexed with let-7 miRNA stock photo
Structure of human argonaute-1 complexed with let-7 miRNA

3D cartoon model, secondary structure color scheme, PDB 4krf, white background

The Exploration Avenue in the King Abdullah University of Science and Technology campus, Thuwal, Saudi Arabia stock photo
The Exploration Avenue in the King Abdullah University of Science and Technology campus, Thuwal, Saudi Arabia stock photo
The Exploration Avenue in the King Abdullah University of...

The University's core campus, located on the Red Sea at Thuwal, is sited on more than 36 square kilometres, encompassing a marine sanctuary, museum, and research facility.

Marble recumbent effigies of Henry II and Catherine de' Medici in a chapel in the northern chevet in Basilica Cathedral of Saint-Denis stock photo
Marble recumbent effigies of Henry II and Catherine de' Medici in a chapel in the northern chevet in Basilica Cathedral of Saint-Denis stock photo
Marble recumbent effigies of Henry II and Catherine de' Medici...

The Basilica of Saint-Denis is a burial place of the French Kings with nearly every king from the 10th to the 18th centuries, as well as many from previous centuries.

Crystal structure of human carboxypeptidase A1 stock photo
Crystal structure of human carboxypeptidase A1 stock photo
Crystal structure of human carboxypeptidase A1

A carboxypeptidase is a protease enzyme that hydrolyzes a peptide bond at the carboxy-terminal end of a protein or peptide. 3D cartoon model, secondary structure color scheme, PDB 2v77, white background.

SARS CoV-2 spike receptor-binding domain (pink) complexed with its receptor ACE2 stock photo
SARS CoV-2 spike receptor-binding domain (pink) complexed with its receptor ACE2 stock photo
SARS CoV-2 spike receptor-binding domain (pink) complexed with...

Structure of novel coronavirus spike receptor-binding domain (pink) complexed with its receptor ACE2 (blue), surface modeel, white background

The Faisal's Finger Rock, a view from the Jabal Tuwaiq escarpment stock photo
The Faisal's Finger Rock, a view from the Jabal Tuwaiq escarpment stock photo
The Faisal's Finger Rock, a view from the Jabal Tuwaiq escarpment

The Faisal's Finger Rock is a natural stand-alone rock about 200 m in height near the Jabal Tuwaiq escarpment, a geological wonder near Riyadh.

The canal in the King Abdullah University of Science and Technology campus, Thuwal, Saudi Arabia stock photo
The canal in the King Abdullah University of Science and Technology campus, Thuwal, Saudi Arabia stock photo
The canal in the King Abdullah University of Science and...

The University's core campus, located on the Red Sea at Thuwal, is sited on more than 36 square kilometres, encompassing a marine sanctuary, museum, and research facility.

Chemical formula, structural formula and 3D ball-and-stick model of dopamine stock photo
Chemical formula, structural formula and 3D ball-and-stick model of dopamine stock photo
Chemical formula, structural formula and 3D ball-and-stick model...

Dopamine (DA, a contraction of 3,4-dihydroxyphenethylamine) is a hormone and a neurotransmitter that plays several important roles in the brain and body. 3D ball-and-stick model, white background

Chemical formula, skeletal formula and 3D ball-and-stick model of naloxone stock photo
Chemical formula, skeletal formula and 3D ball-and-stick model of naloxone stock photo
Chemical formula, skeletal formula and 3D ball-and-stick model...

Naloxone is a medication used to block the effects of opioids, white background

Antibiotic feglymycin P64 crystal form stock photo
Antibiotic feglymycin P64 crystal form stock photo
Antibiotic feglymycin P64 crystal form

Feglymycin is a 13-residues peptide firstly isolated from Streptomyces. 3D cartoon and Gaussian surface models, based on PDB 1w7r, white background.

The famous "Bronze Horseman" illuminated at night stock photo
The famous "Bronze Horseman" illuminated at night stock photo
The famous "Bronze Horseman" illuminated at night

The equestrian statue of Peter The Great, a symbol of Saint Petersburg,

King Abdullah Grand Mosque in the campus of the King Abdullah University of Science and Technology, Thuwal, Saudi Arabia stock photo
King Abdullah Grand Mosque in the campus of the King Abdullah University of Science and Technology, Thuwal, Saudi Arabia stock photo
King Abdullah Grand Mosque in the campus of the King Abdullah...

The Mosque is the spiritual center of the KAUST community. It is constructed of white marble. The courtyard space around the mosque offers a communal gathering site.

Dromedary camels in the camel market near Riyadh, Saudi Arabia stock photo
Dromedary camels in the camel market near Riyadh, Saudi Arabia stock photo
Dromedary camels in the camel market near Riyadh, Saudi Arabia

Domesticated Arab camels for sale

Edge of the World, a popular tourist destination near Riyadh stock photo
Edge of the World, a popular tourist destination near Riyadh stock photo
Edge of the World, a popular tourist destination near Riyadh

A breathtaking rock cliff some 120 km from Riyadh

Structure of HIV-1 reverse transcriptase in complex with RNA/DNA and Nevirapine (red) stock photo
Structure of HIV-1 reverse transcriptase in complex with RNA/DNA and Nevirapine (red) stock photo
Structure of HIV-1 reverse transcriptase in complex with RNA/DNA...

3D cartoon model, chain id color scheme, based on PDB 4puo, black background.

Structure of human cytochrome P450 CYP2C9 with heme and warfarin bound stock photo
Structure of human cytochrome P450 CYP2C9 with heme and warfarin bound stock photo
Structure of human cytochrome P450 CYP2C9 with heme and warfarin...

Cytochrome P450 family 2 subfamily C member 9 is an enzyme protein. The enzyme is involved in metabolism, by oxidation, of both xenobiotics, including drugs, and endogenous compounds, including fatty acids. 3D cartoon model with the differently colored secondary structure elements, white background.

Structure of insulin-like growth factor 1 (IGF-1) stock photo
Structure of insulin-like growth factor 1 (IGF-1) stock photo
Structure of insulin-like growth factor 1 (IGF-1)

Insulin-like growth factor 1 (IGF-1), also called somatomedin C, is a hormone similar in molecular structure to insulin which plays an important role in childhood growth, and has anabolic effects in adults. 3D cartoon model with differently colored secondary structure elements, white background.

Chemical formula, structural formula and 3D ball-and-stick model of a pigment beta-carotene stock photo
Chemical formula, structural formula and 3D ball-and-stick model of a pigment beta-carotene stock photo
Chemical formula, structural formula and 3D ball-and-stick model...

β-Carotene is one of the two most common isomers of the plant photosynthetic pigments, carotenoids.

Human nucleosome with CpG methylated (red) DNA showed stock photo
Human nucleosome with CpG methylated (red) DNA showed stock photo
Human nucleosome with CpG methylated (red) DNA showed

A nucleosome is the basic structural unit of DNA packaging in eukaryotes. The structure of a nucleosome consists of a segment of DNA wound around eight histone proteins and resembles thread wrapped around a spool. 3D cartoon model, black background.

Chemical formula and structure of testosterone, a human male sex hormone stock photo
Chemical formula and structure of testosterone, a human male sex hormone stock photo
Chemical formula and structure of testosterone, a human male sex...

Structural 2D model and 3D ball-and-stick model of the main male steroid hormone, white background

The Devils Marbles Conservation Reserve, Northern Territory, Australia stock photo
The Devils Marbles Conservation Reserve, Northern Territory, Australia stock photo
The Devils Marbles Conservation Reserve, Northern Territory,...

A famous and popular natural landmark in near Stuart Highway

Chemical formula, skeletal formula and 3D ball-and-stick model of (−)-D-erythro-Sphingosine stock photo
Chemical formula, skeletal formula and 3D ball-and-stick model of (−)-D-erythro-Sphingosine stock photo
Chemical formula, skeletal formula and 3D ball-and-stick model...

Sphingosine (2-amino-4-trans-octadecene-1,3-diol) is an 18-carbon amino alcohol with an unsaturated hydrocarbon chain, which forms a primary part of sphingolipids, a class of cell membrane lipids that include sphingomyelin, an important phospholipid.

A panoramic view of Al Wahbah Crater at sunrise stock photo
A panoramic view of Al Wahbah Crater at sunrise stock photo
A panoramic view of Al Wahbah Crater at sunrise

The crater at the early morning in December

The tomb of Henry II and Catherine de' Medici in Basilica Cathedral of Saint-Denis stock photo
The tomb of Henry II and Catherine de' Medici in Basilica Cathedral of Saint-Denis stock photo
The tomb of Henry II and Catherine de' Medici in Basilica...

The Basilica of Saint-Denis became a place of pilgrimage and the burial place of the French Kings with nearly every king from the 10th to the 18th centuries being buried there, as well as many from previous centuries.

Cryo-EM structure of the full-length disease type human huntingtin stock photo
Cryo-EM structure of the full-length disease type human huntingtin stock photo
Cryo-EM structure of the full-length disease type human...

Huntingtin is a disease gene linked to Huntington's disease, a neurodegenerative disorder characterized by loss of striatal neurons. This is thought to be caused by an expanded, unstable trinucleotide repeat in the huntingtin gene, which translates as a polyglutamine repeat in the protein product. 3D cartoon model, secondary structure color scheme, based on PDB 6yej, white background.

The main building of Alfaisal University stock photo
The main building of Alfaisal University stock photo
The main building of Alfaisal University

Alfaisal University is a private, nonprofit, research institute of higher education located in Riyadh, Saudi Arabia. Founded in 2002 by the King Faisal Foundation as a nonprofit student-centered university, Alfaisal University opened its doors and admitted its first students in 2008.

Structure of the SARS-CoV-2 spike glycoprotein stock photo
Structure of the SARS-CoV-2 spike glycoprotein stock photo
Structure of the SARS-CoV-2 spike glycoprotein

Spike glycoprotein homotrimer, a main target for neutralization antibody, to bind its receptor, and mediate membrane fusion and virus entry. Cartoon model, black background.

Edge of the World, a popular tourist destination near Riyadh stock photo
Edge of the World, a popular tourist destination near Riyadh stock photo
Edge of the World, a popular tourist destination near Riyadh

A view from drone of The Edge of the World (Jebel Fihrayn), an unexpected and dramatic geological wonder in the rocky desert northwest of Riyadh, Saudi Arabia.

Chemical formula, skeletal formula and 3D ball-and-stick model of γ-Aminobutyric acid stock photo
Chemical formula, skeletal formula and 3D ball-and-stick model of γ-Aminobutyric acid stock photo
Chemical formula, skeletal formula and 3D ball-and-stick model...

γ-Aminobutyric acid, a chief inhibitory neurotransmitter in the mammalian central nervous system, white background

A car of the MTR train on peak hour during coronavirus quarantine stock photo
A car of the MTR train on peak hour during coronavirus quarantine stock photo
A car of the MTR train on peak hour during coronavirus quarantine

MTR of Hong Kong is usually overcrowded at peak hour, but not during the coronavirus pandemic quarantine. April 2020, Hong Kong.

Sedimentary rock formations of Jabal Tuwaiq in Almufaiger stock photo
Sedimentary rock formations of Jabal Tuwaiq in Almufaiger stock photo
Sedimentary rock formations of Jabal Tuwaiq in Almufaiger

Jabal Tuwaiq is a narrow escarpment that cuts through the plateau of Najd in central Arabia, running approximately 800 km from the southern border of Al-Qasim in the north, to the northern edge of the Empty Quarter desert near Wadi ad-Dawasir in the south.

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