Biology

Apparatus for measuring rates of absorption or evolution of gases from organisms. Comprises two stoppered boiling tubes with wire baskets to support organisms. Each boiling tube is connected to simple manometer tube via three-way tap. The manometer tube is mounted on scale to measure the position and movement of the liquid level as gas is evolved or absorbed. The organism of interest is placed in the basket of one of the tubes, which also has some potassium hydroxide solution to absorb carbon dioxide. The other tube acts as thermobarometer, to counteract changes in temperature. Full instructions are included.

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.

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

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

This innovative device is a compact dry block heater which can be used as a small scale substitute for the traditional water bath, offering several advantages: • Waterless safe and portable • Six test tubes warmed or cooled between 15 °C and 65 °C • Accepts 16 mm diameter test tubes • Digital display for set point and actual temperature • Safe to use, operates at low voltage • Power supply: 12 V AC/DC adaptor • Dimensions: (L x W x D) 175 x 110 x 105 mm

Spare Wire Baskets for BI180500

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.

These versatile modelling Toobers provide hands-on learning experiences in biology and chemistry. Students can model DNA or create protein structures and explore basic protein-folding principles. Toobers are flexible foam rods which have soft wire core that allows them to hold their shape well and they can be simply straightened out afterwards and re-used. Length: 120 cm long. Please note that theses are sold individually and the push pins are not included. See also 'Amino Acid Starter Kit' (MO110150). Also useful for teaching: • How hydrophilic/hydrophobic side-chains influence protein's structure • How structure is critical factor in many protein's function

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.

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.

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.

An accurate and durable height measure extending to over 2 metres. The measurement scale is graduated with both metric and imperial values. When not in use it packs away into its own base. Supplied with project card.

A small, low-priced, battery-powered stereo microscope with LED illumination, simple design and fixed 20x magnification. The microscope has sharp optics and 55-75 mm interpupillary adjustment. The small size and weight make this stereo microscope suitable for use in the field, for viewing insects, leaves, flowers, rocks, pond life etc. Complete with dust cover. • Magnification: 20x • Objectives: 2x • Field of vision: 20 mm diameter • Eyepieces: 10x, wide-field • Dimensions: 23 10 13.5 cm • Illumination: LED (top light) • Power supply: x AA batteries (not included) • Weight: 585g

Basic microscope eyepiece camera with 2 MP resolution, which connects to PC via the inbuilt USB 2.0 cable. Works with both monocular and binocular microscopes by replacing the eyepiece. Fits eyepiece tubes with diameter of 23 mm or 30 mm (adapter included). Comes with software for Windows PCs. Software download: timstar.co/MI170800-driver • MP still resolution • 640 480 live resolution

Eyepiece graticule with 10mm Horizontal Micrometer Scale subdivided into 100 divisions of 0.1mm (100µm).

Stage micrometer with 10 mm scale, subdivided into 100 divisions of 0.1 mm (100µm). Mounted on a black, anodised aluminium slide 76 x 25 x 1.5 mm. Suitable for all microscopes.

Stage micrometer with 1 mm scale, subdivided into 100 divisions of 0.01 mm. Mounted on a black, anodised aluminium slide 76 x 25 x 1.5 mm. Suitable for all microscopes.

The micrometer scale is disc mounted on black glass slide. Suitable for all microscopes. Slide comes with scales: 10 mm x 0.1 mm and 1 mm 0.01 mm. Dimensions: 75 x 25 mm.

An economical but good quality glass stage micrometer slide, with 1.0 mm long x 0.01 mm scale marked on the glass.

An economical but good quality glass stage micrometer slide, with 1.0 mm long x 0.01 mm scale marked on the glass.

Complete micrometer eyepiece WF 10X/18 mm with 100 divisions in 10 mm and crosshair. Suitable for all Motic Microscopes. Diameter: 18 mm.

2 strips of 5 images, each image has a 10mm scale in 0.1mm (100µm) divisions and circular cut guides for 16mm, 19mm, 21mm and 24mm. Printed on plastic film.

The C-chip™ is an easy-to-use, precision disposable plastic haemocytometer, developed to solve the problem of conventional glass haemocytometers. Supplied individually packed, in a box of 50 slides, these Neubauer Improved type haemocytometers have 0.1 mm 0.05 mm grids, for counting blood cells (erythrocytes, leukocytes), mammalian cells etc. Supplied as box of 50 double chamber slides (100 tests). Features and benefits: • No need to coverslip • No need to wash for reuse • No more contact to hazardous materials • Accurate, reliable and repeatable • Bright grid pattern • tests per slide • Pack of 50 double chamber slides (= 100 tests) • Quartz grade optical plastic • Sturdy and strong Main applications: • Blood analysis • Cell culture; cell concentration measurement and cell viability counts • Microbiology; bacterial and fungal spores Dimensions: 25 75 1.6 mm (w l t) Chamber depth: 100 µm Chamber volume 10 µL

These Bright-Line (Rhodium coated) glass Haemacytometers are designed for accurate counting of cells in blood or other fluids, with one-piece glass construction, an H-shaped moat to form two counting areas (plateaus) and ""V"" slash at the loading side of each plateau. Each plateau features enhanced Neubauer rulings, the ruled surface being 0.1 mm below the cover glass, limiting the volume of blood or fluid over square mm to 0.1 cu.mm and over each of 400 squares (within the central square mm) to 0.00025 cu. mm. Contact of the flat, polished cover glass surfaces with cover glass supports produces an exact volume of fluid over the counting area. The difference in surface tension characteristics between the metallic surface on the chamber and the polished cover glass assures smooth capillarity for precise loading and more even cell distribution. Supplied as double chamber with two cover glasses or kit which includes double counting chamber, cover glasses and red and white pipettes, all in protective case. Spare/replacement glass cover glasses are also available, as pack of 2. • Bright Line (Rhodium coated) counting chamber • Improved Neubauer ruling pattern • Cell Depth: 0.100 mm ±2 • Volume: 0.1 µL To clean the counting chamber after use: remove the cover glass and clean with water or mild cleaning solution (e.g. 10% bleach solution). Dry the counting chamber with soft cloth/wipe, or rinse with acetone.

Spare Cover Glasses for Glass Haemacytometer MI160322). Supplied as a pack of 2.

Cover slips No. 0. Resistance Glass 0.09 to 0.13 mm thick. 18 mm x 18 mm. Supplied in a pack of 100.

Cover slips No. 0. Resistance Glass 0.09 to 0.13 mm thick. 22 mm x 22 mm. Supplied in a pack of 100.

Cover slips No. 1. Resistance Glass 0.13 to 0.16 mm thick. 18 mm x 18 mm. Supplied in a pack of 100.

Cover slips No. 1. Resistance Glass 0.13 to 0.16 mm thick. 22 mm x 22 mm. Supplied in a pack of 100.

Cover slips No.1½. Resistance Glass 0.16 to 0.19 mm thick. 18 mm x 18 mm. Supplied in a pack of 100.

Cover slips No.1½. Resistance Glass 0.16 to 0.19 mm thick. 20 mm x 20 mm. Supplied in a pack of 100.

Cover slips No.1½. Resistance Glass 0.16 to 0.19 mm thick. 22 mm x 22 mm. Supplied in a pack of 100.

Cover slips No. 2. Resistance Glass 0.19 to 0.25 mm. 18 mm x 18 mm. Supplied in a pack of 100.

Cover slips No. 2. Resistance Glass 0.19 to 0.25 mm. 22 mm x 22 mm. Supplied in a pack of 100.

Stainless steel with spatula ends.

Two hinged flaps and numbered positions.

A hand microtome suitable for section cutting. The milled head at the base when revolved records 10 microns per click. Brass top plate 75 mm diameter. Overall length 85 mm. Supplied in hinged wooden case.

Clear polished glass, 6 mm deep cavity with flat glass cover. 40 mm x 40 mm.

Glass microscope slides with single frosted panel to allow marking of the slide. These come with tissue paper separating each slide and have ground edges. Dimensions: 76 mm x 26 mm. 1.0 mm thickness. Supplied in a pack of 50.

Washed with 45° ground edges. External cellophane wrapping, interleaved. Dimensions: 76 mm x 26 mm. A thickness of 1.0 to 1.2 mm. Supplied in a pack of 50.

Washed with 45° ground edges. Internal cellophane wrapping with easy-open tear strip. Dimensions: 76 mm x 26 mm. A thickness of 0.8 to 1.0 mm. Supplied in a pack of 50.

Washed with 45° ground edges. Internal cellophane wrapping with easy-open tear strip. Dimensions: 76 mm x 26 mm. A thickness of 1.0 to 1.2 mm. Supplied in a pack of 50.

Washed with 45° ground edges. Internal cellophane wrapping with easy-open tear strip. Dimensions: 76 mm x 26 mm. A thickness of 1.2 to 1.5 mm. Supplied in a pack of 50.

Microscope slides with round, polished 15 mm diameter cavity. Dimensions: 76 x 26 x 1.2 mm (L x W x D). Supplied in a pack of 50.

Widefield eyepiece. WF15X/12mm. Suitable for SFC-100 series, F-1110 LED, F-1115 LED, DM-1802, BA50 Cordless, BA50-X

19 mm eyepiece graticule 10 x 0.1 mm with holder.

• Monocular head 45° inclined 360° rotation • WF10x 18 mm lockable eyepiece • X4, x10, x40, x100 Semi-Planachromatic, DIN objectives • Built-in rackless mechanical stage • Coarse fine focus • 1.25 NA Abbe condenser with iris diaphragm • 3 W LED illumination • Immersion oil dust cover included • Dimensions: 245 x 190 x 380 mm • Weight: 6.8 kg • 5 year warranty

• Binocular head 45° inclined 360° rotation • WF10x 18 mm lockable eyepiece • X4, x10, x40, x100 Semi-Planachromatic, DIN objectives • Built-in rackless mechanical stage • Coarse fine focus • 1.25 NA Abbe condenser with iris diaphragm • 3 W LED illumination • Immersion oil dust cover included • Dimensions: 245 190 380 mm • Weight: 6.8 kg • 5 year warranty

Specification: • Monocular head inclined 30° with built-in 5.0 mega pixel CMOS Camera • x10 wide field eyepiece • Achromatic objectives x4, x10, x40 • Quadruple revolving nosepiece • Coarse and fine focusing • Built-in mechanical stage • Focusable 1.25 N.A. Abbe condenser with iris diaphragm • Built-in halogen illumination 12V/20W with intensity control • Supplied with Motic Images Plus 2.0 Software (multi-language version) • USB 2.0 PC connection