Timstar

Spare Wire Baskets for BI180500

Comprising abstract shaped colour coded parts to represent the nitrogenous bases, pentagonal sugar and pyramidal phosphate parts required to make the Double Helix model of DNA. The model can be displayed on its stand or untwisted into either flat or ladder form. The kits are designed so that only complimentary bases can be joined together. Scale 10 mm 2 Angstroms, 12 layer. The kit comes with stand and full instructions.

The model shows DNA and transcription of RNA. Height approx 500 mm. Complete with stand, instructions and model description.

Explore the primary, secondary and tertiary structure of proteins with the captivating models and tools in this dynamic kit. This engaging, hands-on protein folding kit makes teaching protein structure basics easy. Students will fold a protein while exploring how the chemical properties of amino acids determine its final structure. Students can use the Amino Acid Starter Kit© to: •Learn that the 20 amino acids all share a common backbone but have different side chains, each with different chemical properties. •Identify the chemical properties of the side chains through a dual colouring scheme guided by the kit’s chemical properties circle, amino acid side chain list and coloured plastic clips. •Group the side chains into one of 5 categories: hydrophobic (nonpolar), hydrophilic (polar), negatively charged, positively charged, and cysteines, which sometimes form disulphide bonds. The coloured clip at the base of each side chain indicates chemical properties while embedded coloured balls in the amino acid side chain model show atomic structure. •Employ the kit’s protein-folding activities to first explore the primary and tertiary structure of proteins by constructing a generic 15-amino acid protein, then learn about the secondary structure of proteins by folding a toober model of the first of 3 zinc fingers of the Zif268 protein. Each 1-group set includes 1 chemical properties circle, 1 amino acid side chain chart, 22 amino acids, 1 mini toober, 22 coloured plastic clips and 6 hydrogen bond connectors.

This 5-part classic brain model is an original anatomic cast of real human brain and comes divided along the midsagittal plane. The components of the brain's left half are: • Frontal and parietal lobe • Temporal and occipital lobe • Encephalic trunk • Cerebellum With integral magnets for easy viewing and hands on learning, the classic brain is great education tool for teaching and learning about the human nervous system and anatomy of the brain. The model comes complete with removable base for mounting and display purposes.

This life size 2 part human brain is a median section model. The right hemisphere has the cerebellum and the stem with occipital lobe. On base. Numbered with English Key Card. Dimensions 190 x 150 x 150mm (D x W x H).

Students will immediately become engaged with this interactive foam model of double-stranded DNA and single-stranded RNA. The DNA Starter Kit© is schematic model that transforms from the familiar ladder shape to the double helix with twist. Students can explore the structure of colour-coded DNA bases showing purines and pyrimidines which connect to continuous sugar-phosphate backbone. Then they can delve into replication and transcription. Using individual nucleotide triphosphates, they can synthesize new strand of DNA one base at time showing the semi-conservative replication of DNA. Finally they can synthesize mRNA one base at time to show the process of transcription. Each kit includes: 51 bases (12 red adenine, 12 yellow thymine, 12 blue cytosine, 12 green guanine, 3 white uracil), 4 continuous grey backbones, 24 grey sugar-phosphates, 12 lavender sugar-phosphates and 48 orange phosphates.

The sky is the limit to what you can teach using these new large-scale, colour-coded foam nucleotides. Begin by teaching the complementary A-T and C-G base pairs and the antiparallel nature of double-stranded DNA. Move on to the flow of genetic information as you teach the basic processes of semiconservative DNA replication and mRNA transcription. You can then stretch students by introducing PCR (polymerase chain reaction) and the Sanger DNA sequencing method -- and much more. 80 Large-Scale Nucleotides: • 20 Red Adenosine • 20 Yellow Thymine • 20 Blue Cytosine • 20 Green Guanine 80 Adhesive-Backed Round Magnets

Comprising abstract shaped colour coded parts to represent the nitrogenous bases, pentagonal sugar and pyramidal phosphate parts required to make the Double Helix model of DNA. The model can be displayed on its stand or untwisted into either flat or ladder form. The kits are designed so that only complimentary bases can be joined together. Scale 10 mm 2 Angstroms, 22 layer. The kit comes with stand and full instructions.

Human ear, enlarged approx. 4 times and dissected into 5 parts, showing external, middle and internal portion. Ossicles and labyrinth can be taken out. Mounted on base, numbered and with Key Card. Dimensions 370 x 240 x 190mm (L x W x D).

Classic model of the human eye with highly accurate and detailed colourful components. Dissects into 6 parts: a two-part sclera with cornea and eye muscle attachments, both halves of the choroid with iris and retina, lens and vitreous humour. Comes with detachable base and photocopiable key to parts in 4 languages. Dimensions 205 x 130 x 150 mm.

Colourful representation of the outer, inner and middle ear including: removable eardrum with hammer and anvil, 2-part labyrinth with stirrup, cochlea and auditory/balance nerve. Comes with base and photocopiable key to parts in 4 languages.

This innovative functional eye model is an open design model, offering high visibility, which does not involve the injection of liquid*! It is composed of a flexible lens with an adjustable focal length, which constitutes the crystalline lens for comprehensive visualisation. The adjustment of the crystalline lens is made by mechanical stress on the flexible lens, which is similar to the action of the ciliary muscles. The screen represents the retina that can slide along the optical axis to simulate vision problems (myopia, hyperopia). The lens holder is placed in front of the eye to allow corrective lens to be put in place. The crystalline lens is equipped with an adjustable focal, without the need for further injection of liquid*, which enables the study of vision problems and their correction. Contents: eye model and kit of corrective lenses. *a one-time injection of liquid is required when setting up the apparatus for the first time only.

Prepared slide, angiospermae - dicot stems, helianthus (Sunflower) TS stem young.

Prepared slide, angiospermae - dicot stems, ranunculus (Buttercup) TS stem.

Prepared slide, angiospermae - dicot leaves, ligustrum (privet) TS leaf.

Prepared slide, angiospermae - dicot leaves, prunus lauro-cerasus TS leaf.

Prepared slide, angiospermae - monocot leaves, allium leaf epidermis 'E' with stomata.

Prepared slide, angiospermae - dicot leaves, helianthus (Sunflower) TS leaf.

Prepared slide, angiospermae - monocot leaves, ammophila TS xerophyte.

Prepared slide, angiospermae - monocot leaves, zea mays (Maize) TS leaf.

Prepared slide, angiospermae - anther and pollen development, lilium anthers TS mature pollen.

Prepared slide, coniferophyta (conifers) pinus 'E' stem showing xylem tubes.

These new atomic structure kits from Bright of Sweden are an award-winning, hands-on teaching aid for students. The unique models, based on Bohr's atomic model, allow students to make their own atoms, isotopes and ions and give them great hands-on experience of the structure of atoms. Each kit includes: Box with lid; electron shells on the lid and at the underside of the box; 30 protons; 30 neutrons; 30 electrons; smart storing of subatomic particles inside the box.

The complete package! This whole class set contains one Atomic structure Demonstration kit and eight Atomic Structure Student Kits, along with lesson plan/working sheet which has been developed together with science teachers; use it for studying activities, for tips and guidance or as tests for the students.

Student version spare particles, consisting of 30 protons, 30 electrons and 30 neutrons.

Economical clear acrylic burette, white graduations. TPX/Teflon stopcock.

A clamp consisting of two plastic coated spring clips mounted 50 mm apart on stainless steel plate with rod. Dimensions 150 x 8 mm (L x Diameter).

Economical clear acrylic burette, white graduations. TPX/Teflon stopcock.

Economical die cast metal burette holder with integral boss. Simple clamping action for use with one burette.

Economical die cast metal burette holder with integral boss. Simple clamping action for use with two burettes.

Strong burette holder with alloy cast jaws with plastic ends to clamp single burette. Suitable for burettes up to 100 mL.

Hardwood complete with base and rod. All parts are interchangeable. Burette clamps are cork lined.

A one piece clamp moulded from acetal homopolymer to hold a 50 mL burette. Suitable for 12 mm diameter retort rods only.

A pattern unit comprising high strength alloy casting with plastic jaws. Suitable for all burettes up to 100 mL capacity.

Glass stopcock Class A with blue graduations.

Polypropylene.

To BS 846 Class B, permanent amber stain graduations.

This Class B burette is made from precision bore borosilicate glass for improved accuracy along the entire length. It has an interchangeable PTFE stopcock and a replaceable glass jet. This burette has blue graduations every 0.1 mL and has a tolerance of +/- 0.1 mL. Manufactured in accordance with BS EN ISO 385: 2005.

Spare 50 mL tube with 0.1 mL graduations. For BU03765.

Spare stopcock and jet. For BU03765.

Spare jet for BU03765.

Class B burette with PTFE stopcocks and white 0.1 mL graduations.

Class B burette with PTFE stopcocks and black 0.1 mL graduations.

Class B burette with glass stopcock and white 0.1 mL graduations.

Resistant to most chemicals and stable from 40 °C to 200 °C.

To BS 846. Class B with permanent blue graduation.

To BS 846 Class B. Blue graduations.

White enamel back, PTFE stopcock, blue graduations.

To BS 846 Class B. Amber graduations.

With 'Rotaflo' stopcock and porosity 'O' sintered disc. Stopcock bore 3 mm. Socket 19/26. Dimensions (L x Diameter): 300 x 20mm.

A mixture of cyan, magenta and yellow inks which appears black when combined but separates out into bright constituent colours when spotted on chromatography card and separated using solvent, (water) or by electrophoresis. Provides sufficient for approximately 500 ink spots.

An ink which uses isopropyl alcohol, instead of water, as solvent, so it dries by absorption instead of evaporation. When paper with Quink becomes wet, the ink will run into its separate components. The bottles have low centre of gravity to reduce the risk of tipping over. Supplied in 57 mL bottle.

Scarlet chromatography ink

Green chromatography ink

Blue/Black chromatography ink

Supplied as box of 100 sheets.

Supplied as box of 100 sheets.

Pattern 'CRL'. Eleven 3mm wide slots. Supplied as box of 100 sheets.

Supplied in reel, 100 m long.

Supplied in reel, 100 m long.

Supplied in reel, 100 m long.

Supplied in reel, 100 m long.

Supplied in reel, 100 m long.

Supplied in reel, 100 m long.

Supplied in reel, 100 m long.

Dimensions (W x D x H): 230 x 90 x 230 mm.

To fit CH04012.

A set of 4 Mystrica colorimeters supplied in a deep Gratnells tray with a lid and polyethylene foam insert. The Mystrica colorimeter delivers high quality performance in a small, robust, user-friendly and affordable package. It has 3 LED light sources emitting red (630nm), green (525nm) or blue (465nm) which are easily selected using the RGB button. You can choose to measure either absorbance or transmittance with the simple press of a button. Absorbance readings are shown from .000 to 1.999 and transmittance is shown from 100.0 to 0.1%. The power switches off after 2 minutes to conserve battery life, unless it is connected to a PC, tablet or phone. This colorimeter allows the use of 12 mm test tubes as well as standard 4.5 mL cuvettes, creating a more versatile unit. Features: • Wireless connection to iPads, iPhones and Android™ devices • Mystrica Colorimeter app available on the App Store and Google Play™ • Each colorimeter has unique identity. The app detects all units within range of an iPad or iPhone and allows one to be selected • Collect data as graphs and tables • Continuous data collection or separate readings • Best fit line for rate of reaction • Email results as .csv file for analysis and storage • Fully supported suggestions for practical activities. • Power: 4 x AA batteries (not included) or via USB when connected to computer Price includes 4 colorimeters, 40 plastic cuvettes with caps, 4 cuvette stands, 25 x 12 mm glass test tubes, 2 sets of instruction sheets, 2 user manuals and 4 USB links.

Rod and disc type. Borosilicate glass. 20 discs.

Non-jointed, borosilicate glass.

Non-jointed, borosilicate glass.

Pair of rods.

Carbon rods, 100 x 5 mm. Pack of 10 rods.

Carbon rods, 200 x 8 mm. Pair of rods.

Platinum electrodes, with screw terminals. Manufactured in borosilicate glass. Length from tip of foil to tip of terminal, 114 mm.

These versatile electrode holders are suitable for holding Carbon rod electrodes as well as metal strip electrodes. They are designed to fit over 100 mL and 250 mL glass beakers, being held in place by small plastic lugs to prevent them slipping off. Resistant to corrosion, they accept 6 - 8 mm diameter cylindrical (e.g. carbon) electrodes and 19mm wide, 0.8 mm (minimum) thick metal strip electrodes. The brass connectors also resist corrosion and are compatible with the usual 4 mm stackable type lab leads. To tighten the carbon electrodes without crushing them, the setscrew is equipped with stop. • 4 mm sockets • Dimensions (L x W x H): 100 x 40 x 15 mm • Complete with 2 carbon electrodes

These 'S' shaped electrodes are convenient and easy to use simply hang them over the rim of the beaker containing the electrolyte and connect crocodile clips with 4 mm leads to them! Made from insulated brass, with a short length of carbon rod attached at the lower end and bare contact at the top for attaching crocodile clip. Supplied as a pair of electrodes.

These round electrodes will fit the electrode holder EL110620, the electrode connector EL150426, and rubber stoppers with hole. Diameter 6-7 mm.

These round electrodes will fit the electrode holder EL110620, the electrode connector EL150426, and rubber stoppers with hole. Diameter 6-7 mm.

These round electrodes will fit the electrode holder EL110620, the electrode connector EL150426, and rubber stoppers with hole. Diameter 6-7 mm.

These round electrodes will fit the electrode holder EL110620, the electrode connector EL150426, and rubber stoppers with hole. Diameter 6-7 mm.

These round electrodes will fit the electrode holder EL110620, the electrode connector EL150426, and rubber stoppers with hole. Diameter 6-7 mm.

These round electrodes will fit the electrode holder EL110620, the electrode connector EL150426, and rubber stoppers with hole. Diameter 6-7 mm.

These round electrodes will fit the electrode holder EL110620, the electrode connector EL150426, and rubber stoppers with hole. Diameter 6-7 mm.

Dimensions: 100 x 10 mm. Sold in packs of 10.

Each cell consists of 75 x 25 mm glass cylinder with 2 hole rubber stopper fitted with carbon electrodes. Electrical contact is made through the crocodile clips and a piece of insulating material between the electrodes prevents short circuiting. The gases evolved are collected in two 75 x 10 mm test tubes suspended over the electrodes by piece of wood and rubber bands (not supplied).

Spare glass tube for EL06891.

Spare carbon electrodes for EL06891.

This kit uses the juice within lemon as an electrolyte in an oxidation-reduction reaction to produce useful electricity sufficient to power clock. The electrodes must be sanded clean between each attempt. Requires lemons to make ""batteries"" in series to generate sufficient voltage to power the clock.

Consisting of an inverted U-tube with its ends closed by sintered discs. Dimensions (Diameter W x H): Arms 13 x 80 x 100 mm.

This set allows students to experiment with the characteristics of primary cells (voltaic cells). By using different electrodes and electrolytes, various voltaic cells can be made and tested. The set contains various different electrodes, including zinc, lead, aluminium, carbon, tin, copper, nickel and iron. Also included are a plastic cell container with electrode holders and porous pot. Instructions included. Dimensions: 100 x 20 mm (approx.).

Suitable for use with EL180875 and EL180877.

Comprises three parallel tubes, joined at the bottom with a horizontal tube. The central tube has a funnel for filling with water, and the side tubes have open ends at the bottom to allow bungs that hold electrodes to be fitted, and jets with stopcocks at the top for collecting gas in test tubes. The side tubes are graduated 0-50 x 0.2 mL so that the volume of gas in each can be measured. Clamps and support base (sold separately) are recommended so the unit can be mounted on retort rod.

Comprises three parallel tubes, joined at the bottom with a horizontal tube. The central tube has a funnel for filling with water, and the side tubes have open ends at the bottom to allow bungs that hold electrodes to be fitted, and jets with stopcocks at the top for collecting gas in test tubes. The side tubes are graduated 0-50 x 0.2 mL so that the volume of gas in each can be measured. Clamps and support base (sold separately) are recommended so the unit can be mounted on retort rod.

For student experiments. Embedded platinum electrodes are connected via 4 mm sockets. Two miniature test tubes are included for gas collection.

Shade welding filter lenses, as recommended for safe viewing of burning magnesium etc. Sold as pack of 10 filters.

Shade welding filter lenses, as recommended for safe viewing of burning magnesium etc. Sold as pack of 10 filters.

Cobalt blue. Dimensions: 75 x 50 mm.

Fused into glass handle.