Search PubMed⌕ Search

Biomedical subjects

J Gonzalez

Publications and source records attributed to J Gonzalez.

247 records · Page 14Linked to original sources
PubMedDate not supplied

Human sperm penetration into zona-free hamster oocytes as a test to evaluate the sperm fertilizing ability.

Human sperm entry into zona-free hamster oocytes was used to test the fertile ability of spermatozoa from semen samples of men attending an Infertility Clinic. Sperm chromatin dispersion as seen under the phase-contrast microscope, was used as criterion for sperm entry. The ultrastructural study showed that the behaviour of the gamete membranes during fusion did not basically differ from that of normal fertilization. Eighty four samples were classed as normal (according to the spermiogram) but only 62 (74%) gave a positive test, as compared to only 30 (32%) positive test of 95 samples with abnormal spermiograms. Eight hundred and ten oocytes inseminated with spermatozoa from normal samples gave a 25% penetration, while 1046 oocytes inseminated with spermatozoa from abnormal samples gave a 7% penetration. The normality of hamster oocytes was demonstrated by contemporary insemination with human and hamster spermatozoa. While the percentages of human sperm penetration remained low, hamster sperm penetration was over 70%. The present bioassay is recommended as an additional parameter to the spermiograms for the study of male fertility.

Animals↗
PubMedDate not supplied

Colonization and laboratory maintenance of Anopheles albimanus Wiedemann in Venezuela.

Anopheles albimanus is one of the main vectors of malaria in Central America and the Caribbean, based on its importance, there are previous reports of the successful colonization of this species in Latin America countries. Mosquitoes were collected in the Aragua State of Venezuela colonized in the laboratory, using a simple and efficient maintenance method. Based on life table calculations under well established laboratory conditions, the Survival Rate Probability was constant and always close to 1 in immature stages, the Reproductive Net Rate (Ro) was 3.83, the generation time (Tc) was 24.5 days and the Intrinsic Growth Rate (rm) was 0.0558. This is the first report of the colonization of A. albimanus in Venezuela.

Animals↗
PubMedDate not supplied

Sexual rehabilitation of urologic cancer patients: a practical approach.

Sexual rehabilitation is an important aspect of preserving a patient's quality of life after treatment for urogenital cancer. Sexual rehabilitation does not usually require a specialized program, but can be an integral part of cancer treatment. Members of the health care team can provide sexual information for the patient and partner, as well as assess the need for more intensive marital or sex therapy. This paper presents specific sexual issues related to prostate, bladder, testicular, and penile cancers.

Female↗
PubMedDate not supplied

[Changes in the hierarchical structure of Mexico's national settlement system].

"This paper uses an economic index to describe the hierarchical structure of the national settlement system and describes the changes among the sixties, eighties and nineties. We found great territorial changes for the first period. The conclusions proposed are that there is a decentralisation at [the] national level, but at the same time, there is a centralisation at [the] regional level." (SUMMARY IN ENG)

Americas↗
PubMedDate not supplied

A lymphoproliferative disease in Japanese Quail.

A naturally occurring lymphoproliferative disease was found in 3 flocks of Japanese quail in Mexico. The tumorlike lesions were detected mainly in livers and spleens. Histopathology revealed a pleomorphic lymphoproliferative infiltration with dark-staining large cells, lymphocytes of different sizes, and reticulumlike cells. Marek's disease (MD) herpesvirus was not isolated from 74 quail tested, nor were antibodies to MD detected in 84 sera. Antibodies to reticuloendotheliosis (3/24) and avain leukosis virus subgroup A (2/24) were present. The possible etiology of this disease is discussed.

Animals↗
PubMedDate not supplied

MR imaging in neurocysticercosis: a study of 56 cases.

We reviewed the MR findings in 56 patients with neurocysticercosis (NCC). MR findings were correlated with other neuroradiologic findings in 40 cases, with histopathologic studies in 15 surgically treated patients, and with autopsy findings in one case. Active NCC was characterized by the presence of a cyst in the brain parenchyma (53%) or in an intraventricular subependymal (22%) or subarachnoid (10%) location. The cysticercus appeared as a vesicle with a high-intensity signal nodule that corresponded to the scolex. Cyst mobility was observed in two intraventricular cases. Periventricular edema and ependymitis appeared as high-intensity signal on T2 sequences. Inactive NCC (15%) was characterized by calcifications (signal void on T1 and T2 sequences), aqueductal stenosis, and tissue thickness in the basal meninges. Degenerative cysticercus appeared on MR as an irregular vesicle without a scolex. Active NCC was better detected with MR than with CT (85% vs 21%), whereas inactive forms were observed better with CT (23% vs 14%). We conclude that MR is sensitive in the diagnosis of active NCC and may be useful in evaluating the degenerative changes in the parasite that occur as a result of natural degeneration, host response, or medical therapy.

Adolescent↗
PubMedDate not supplied

Relapsing focal myositis: a case report.

We present a 9 year old boy with a focal myositis presenting as a pseudotumor on the right calf. Other smaller masses were present in the thigh and pretibial area on the same leg. The principal lesion recurred after two surgical excisions. Corticosteroid treatment was unsuccessful. However, methotrexate therapy resulted in a progressive regression of the lesions.

Child↗