Infrared absorption analysis has been carried out to determine whether the adsorption of GR-S (co-polymer of polystyrene and polybutadiene) on carbon black is specific as to the chemical structure of the polymer. The comparison of the relative intensities of the characteristic absorption bands of the original GR-S with the ratios of the intensities of the same bands for the fraction of rubber remaining after certain fractions were specifically removed by carbon black has shown that the adsorption is not specific as to chemical structure within the limits of accuracy of infrared analysis. The particular chemical groups considered were the phenyl structure (infrared absorption at 13.20 and 14.27 microns) of polystyrene and the 1,2 (10.08 and 10.95 microns) and 1,4 (10.37 microns) addition units of butadiene.
The Methods of the Cheney Medicine Co. Drs. Brown and Lenox, Rogers, Ark., send us an account of a case of catarrh AA'hich was not cured by Hall's Catarrh Cure. The patient, Mr. Robert Parks, consulted these physicians for catarrh and stated that he had just finished his tAventy-sixth bottle of Hall's Catarrh Cure, but that instead of being bene¬ fited he Avas worse. Mr. Parks wrote to the Cheney Medicine Co., the makers of Hall's Catarrh Cure, giving his experience, and asking the firm to pay $100 in accordance Avith the adver¬ tisements: "$100 for any case of catarrh which it Avili not cure" or to refund the money he had paid. The following is a copy of a letter which he reeeh'ed in reIll-v :
Summary
Aromatic L‐amino acid decarboxylase deficiency is an autosomal recessive disorder that results in a lack of neurotransmitters including serotonin, dopamine, noradrenaline and adrenaline. It is characterised by developmental delay, severe hypotonia and autonomic disturbance. In patients with this condition, catecholamine deficiency and autonomic dysfunction, resulting in haemodynamic instability under anaesthesia is a primary concern. There is increased sensitivity to exogenous catecholamines and indirect acting agents, such as ephedrine, are ineffective. Hypoglycaemia, difficult airway status and drug interactions such as with monoamine oxidase inhibitors are also of concern, and these patients are at risk of dystonic crises peri‐operatively. A 6‐year‐old boy with aromatic L‐amino acid decarboxylase deficiency presented for gastrointestinal endoscopy. Following multidisciplinary discussion, we elected to provide general anaesthesia with a propofol target‐controlled infusion, which proceeded without incident. In this report, we describe the precautions taken in this case, and discuss the provision of general anaesthesia for children with rare neurometabolic disorders.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.