3,020 resultados para prueba

  • 6113-07731171

    Students and teacher examining globe in classroom

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    Publishers talking in sunny office

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    Female cell biologist holding a flask containing stem cells, cultivated in red growth medium, to investigate disease

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    Scientist viewing sample on glass slide through microscope for medical testing

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    Portrait smiling casual businesswoman reviewing proofs with businessman in office

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    Portrait of scientist with dna molecular model

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    Businessmen analyzing documents on wall in office

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    Cell biologist holding a flask containing stem cells, cultivated in red growth medium, to investigate diseases

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  • 632-08130287

    Scientist examining test tube

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    Hair sample collected from crime scene for genetic testing in laboratory

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    Professor watching college students taking test in classroom

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    Smiling elementary teacher with students on blackboard behind her

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    Schoolboy struggling in educational exam

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    College students taking test at desks in classroom

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    Police Taking Fingerprints

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    University students taking exam at classroom

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    Elevated view of students writing their GCSE exam

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    Scientist viewing a DNA profile experiment in a laboratory

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    Profile view of young male scientist looking at small test tube in laboratory

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    Stem cell research. Female scientist examining cell cultures in multiwell tray

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    Close up of teenage girl examining test tube

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    Pipette dropping a solution into a vial, used for storing liquid during chemical or biological research

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    Scientist scrutinizing test tubes containing blue liquid in lab

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    DNA sample swab collected from crime scene for genetic testing in laboratory

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  • 6109-06007579

    Smiling elementary teacher standing in classroom with books in her arms

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    Student using tablet computer in class

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    Forensic scientist holding evidence bag from crime scene in laboratory

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  • 6109-08203241

    Man typing on laptop and using smartphone at desk

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  • 632-08130046

    Scientist scrutinizing test tubes in lab

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    University students taking exam in classroom

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    Female scientist monitoring plant samples in lab

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    Portrait of scientist with lab equipment and machinery

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  • 6113-07762457

    Lawyer showing documents to jury in court

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    Students passing note between desks during their GCSE exam

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    Scientist examining test tube in lab

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  • 649-07710329

    Pipette dropping a solution into a vial, used for storing liquid during chemical or biological research

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  • 649-08060587

    Stem cell research, nuclear transfer of embryonic stem cells used in cloning for medical research

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  • 649-08125920

    Scientist viewing sample on a glass slide through microscope for medical testing

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  • 649-07520617

    Young female scientist experimenting in laser laboratory

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    Class of schoolchildren doing educational exam

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  • 6113-07731281

    Students and teacher examining globe in classroom

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  • 622-08122924

    Newspaper and magnifying glass

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  • 700-03587258

    Check Mark in Box

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  • 614-06974198

    Three surveillance cameras

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    Engineer measuring manufactured component for accuracy and quality control

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    Scientist filling out evidence bag

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  • 6105-05396464

    Scientist writing a sample report in the laboratory of water treatment plant

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  • 693-07913026

    Young businessman explaining document to colleagues in creative office

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    Scientist scrutinizing test tubes in lab

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    Students examining plants with teacher

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    Biology student looking at petri dish

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    Writing letter

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  • 649-06845246

    Portrait of scientist in laboratory

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  • 649-07710389

    Genetic sample and DNA autoradiogram

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  • 649-07648287

    Young man in face mask on gym exercise cycle in altitude centre

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  • 6113-08769730

    College students taking test at desks in classroom

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    Professor collecting test from students in classroom

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    Portrait of two scientists in technical laboratory

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  • 6113-07808752

    Overhead view of students passing note between desks during their GCSE exam

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  • 649-08060588

    Stem cell research, nuclear transfer of embryonic stem cells from petri dish used in cloning for medical research

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  • 614-06623428

    Driving instructor congratulating student

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  • 6113-08088469

    Creative businessmen meeting in cafe

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    Teacher watching over teenagers in classroom

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  • 6109-07497974

    Concentrating trainee and instructor repairing an engine in workshop

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  • 622-08723354

    New type of smartphone

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  • 649-07064303

    Man photographing with digital tablet

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  • 649-07585348

    Cotton swab with saliva over microcentrifuge tubes

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    Pipetting DNA sample collected from crime scene into vial for forensic testing in laboratory

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    Elevated view of two technicians in working laboratory

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  • 649-07560430

    A row of human samples for analytical testing including blood, urine, chemistry, proteins, anticoagulants and HIV

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    Biology students working with pipettes in lab

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    Lab technician conducting experiment in laboratory

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    Students working in class

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  • 628-05817412

    Test tube filled with a blue liquid

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  • 6109-06005318

    Man wearing a suit and a woman intently studying information on business reports while sitting behind a laptop

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  • 649-07279841

    Female scientist examining stem cell cultures in laboratory

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    Scientist viewing seedling in test tubes under trial in lab

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    Close up of female scientist examining at test tube

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    Portrait of female scientist examining test tube

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  • 6113-07731187

    Students and teacher examining globe in classroom

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    Scientist holding DNA autoradiogram in laboratory

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    Forensic investigation of knife from crime scene

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  • 649-07064908

    Biology students working in lab

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    Close up of male and female legs running on gym treadmill in altitude centre

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  • 6105-07521476

    Engineer at electric power plant examining a transducer

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  • 6109-06007578

    Elementary teacher with students working on blackboard behind her

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  • 649-07710328

    A row of human blood and chemistry samples awaiting testing in the lab

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  • 649-07761198

    Female scientist holding up plant samples in test tubes

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  • 649-07585399

    Genetic research. Micropipette filling eppendorf microcentrifuge tubes, commonly used in biochemical and biological research. Laptop screen that displays results of automated DNA sequencing

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  • 632-03403144

    High school students concentrating in class

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