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Biomedical subjects

C Ramirez

Publications and source records attributed to C Ramirez.

At least 73 records · Page 4Linked to original sources
PubMed1980

Minimum intensities of white noise which produce the vasomotor response.

Twelve normal hearing awake adult subjects were tested to determine the minimum intensities of white noise which produce a detectable change in digital blood flow. A digital plethysmograph was utilised to detect and record these changes. The stimulus intensity was adjusted in 5 dB increments, beginning at an intensity below voluntary threshold, for a total of four data trials. The range of minimum intensities producing the response was 20 to 60 dB HTL, however, there was no significant variation in the mean intensities required to produce the response from trial to trial (F = 0.48, df-3.30, N.S.). The results support further research into the development of peripheral vascular techniques in determining the presence or absence of hearing for individuals who cannot be tested by voluntary audiometry.

Acoustic Stimulation↗
PubMed1980

Airborne fungi in the air of barcelona, Spain. V. The yeasts.

During a two-year survey of the fungal flora present in the air of Barcelona, Spain, the following species of yeasts were isolated: Sporobolomyces roseus Kluyver et van Niel, Candida albicans (Robin) Berkhout, Rhodotorula glutinis (Fres.). Harrison var. glutinis and Rhodotorula minuta (Saito) Harrison. Diurnal and seasonal incidences are presented.

Air Microbiology↗
PubMed1978

Three new species of penicillium.

Three new species of microfungi belonging to the genus Penicillium Link ex Fries are described and illustrated. All but one have been isolated from the atmosphere of las Palmas, capital city of the island of Gran Canaria (Canary Islands, Spain). They clearly differ from all species of the genus described so far and are, therefore, described and proposed as new species: Penicillium hispanicum sp. nov., Penicillium grancanariae sp. nov., and Penicillium palmensis sp. nov.

Air Microbiology↗
PubMed1978

Torulopsis pampelonensis sp. nov. A new species of yeast isolated from beech forest soil.

A new yeast species, Torulopsis pampelonensis is described. Six strains were recovered from a gleyic Andosol under a beech forest and two other strains from the surface of fallen leaves of Fagus silvatica L. Although it showed some morphological and physiological similarities with Torulopsis tannotolerans Jacob and Torulopsis navarrensis Ramírez and Moriyón, it differed from all Torulopsis species presently known.

Alcohols↗
PubMed1978

Halobacterium vallismortis sp. nov. An amylolytic and carbohydrate-metabolizing, extremely halophilic bacterium.

The extremely halophilic bacterium (formerly designated as strain J.F. 54) isolated from salt pools of the Death Valley, California, is a motile, Gram-negative, extremely pleomorphic organism, aerobe, and facultative anaerobe. A variety of carbohydrates are assimilated with or without acid production; soluble starch is hydrolyzed. The organism is not proteolytic; catalase, oxidase, and DNase reactions are positive; Tween 20 is slightly hydrolyzed, but Tweens 40, 60, and 80 are not. Nitrates are reduced to nitrites with gas production; nitrites are not reduced. Optimum growth temperature is 40 degrees C. Growth is inhibited by bacitracin and by novobiocin. The type strain J.F. 54 differs from described species of the genus Halobacterium and is assigned to a new species, Halobacterium vallismortis sp. nov.

Carbohydrate Metabolism↗
PubMed1977

Genus Aotus Q- and G-band karyotypes and and natural hybrids.

Q- and G-banding studies of Aotus trivigatus trivirgatus and Aotus trivirgatus griseimembra are presented. After the analysis of 8 specimens, 2 A.t. trivirgatus and 6 A.t. griseimembra and the review of the literature on the field we state the existence of two different karyotypes, 2n = 54 and 2n = 50, for A.t. trivirgatus and three different karyotypes, 2n = 54, 2n = 52 and 2n = 50, for A.t. griseimembra. It was found that Robertsonian translocations were the mechanism involved in the numerical reduction of the chromosomes. The data presented include the statement of two natural hybrids and the cross-breedings which originated them.

Animals↗
PubMed1977

Incidence of aflatoxin-potential contamination in Spanish sausages.

525 strains of moulds were isolated from 8 samples of red pepper (Capsicum annuum) and from 3 samples of black pepper (Piper nigrum). These spices were commonly added to the various kinds of spanish sausages, specially to the spanish "chorizo". Of these 525 isolated moulds, 100 belonged to the Aspergillus flavus group. 69 were isolated from red pepper and 31 from black pepper. Of these strains, 28 strains isolated from red pepper were found positive in producing aflatoxin B1 while only 8 of the strains isolated from black pepper produced aflatoxin B1. 16 of the strains isolated from red pepper also produced aflatoxin G1. After experimental contamination by these aflatoxicogenic strains of moulds of various kinds of spanish sausages, and after drying them under similar storage conditions used in the sausage industry, the presence of aflatoxin were detected only on the skin but not in the meat of the sausage.

Aflatoxins↗
PubMed1976

Genus Cebus Q- and G-band karyotypes and natural hybrids.

The Q- and G-band analyses of Cebus capucinus, Cebus albifrons and Cebus apella are presented. The study is based on the results obtained from 18 specimens of the genus. For almost all of them, their exact locality is known. The data presented include the statement of two natural hybrids from C. capucinus and C. albifrons. On an evolutionary basis our results agree with the taxonomic concepts which postulate more similarity between C. capucinus and C. albifrons than between C. capucinus and C. apella. Furthermore, the comparative study of the Q- and G-band patterns indicates an independent chromosome evolution for C. albifrons and C. apella derived from a common ancestor more similar to C. capucinus.

Animals↗
PubMed1975

The ubiquity of big brother.

Teachers from grades K through 6 nominated the most physically active and most physically passive students from each sex. Half the schools were attended mainly by low-SES Mexican-American students and half upper-middle-SES Caucasian students. The main finding was that physically active students were more likely to have an older brother than were physically passive students. This effect was independent of sex, grade level, race, SES, and other-sibling combinations. A second study confirmed this relationship when college students rated themselves on the same active-passive dimension.

Adolescent↗