A SIMPLE MICROPIPETTE HOLDER

A Holder Needle.

THE finest movements of surgery are made with the fingers and thumb, not with the wrist and hand as a whole. In the usual method of suturing, the needle is grasped by the needle-holder which is held more or less in the palm of the hand. The fine, sharp needles of ophthalmic surgery, such as those made by Grieshaber, inevitably become dulled as they are grasped by the metal blades of the needle-...

A simple dog head holder for use with the Lab Tronics stereotaxic instrument.

The use of the dog as an experimental animal in neuro-and psyehopharmacologieal studies is increasing because many drugs affect the dog in a manner similar to that of man. At least two stereo-taxic atlases of the mongrel and/or beagle dog already have been published (Leontovich and Meting 1956; Lim et al. 1959) and several others are in the planning stage. Hume and Ganong (1956) have described ...

Rethinking Holder

suggests are either slight or problematical themselves. But given that the profession still refuses to listen, the long, sad story of the scholarly tradition in English metrics cannot be told too often. Both experienced prosodists and those who are only occasional visitors to this field will find RM a useful and enjoyable guide to what Holder calls ’the muddled kingdom of meter’ (Chapter 1), ’t...

Performance studies in micropipette calibration

The measurement of small amounts of liquids is very important in fields like, health, chemistry, microbiology and genetics. The most common used instruments for delivery of liquids, in the order of the microliter, are micropipettes or piston pipettes, of fixed or variable volume, with positive or air displacement operation. The method used in the calibration of micropipettes is the gravimetric ...

A Test Lens Rack Holder.