RESUMEN
BACKGROUND: The name pasta filata refers to a unique plasticizing and texturing treatments of the fresh curd in hot water that imparts to the finished cheese its characteristic fibrous structure and melting properties. Mozzarella cheese made from standardized homogenized and non-homogenized buffalo milk with 3 and 1.5%fat. The effect of homogenization on rheological, microstructure and sensory evaluation was carried out. MATERIAL AND METHODS: Fresh raw buffalo milk and starter cultures of Streptococcus thermophilus and Lactobacillus delbrueckii ssp. bulgaricus were used. The coagulants were calf rennet powder (HA-LA). Standardized buffalo milk was homogenized at 25 kg/cm2 pressure after heating to 60°C using homogenizer. Milk and cheese were analysed. Microstructure of the cheese samples was investigated either with an application of transmission or scanning electron microscope. Statistical analyses were applied on the obtained data. RESULTS: Soluble nitrogen total volatile free fatty acids, soluble tyrosine and tryptophan increased with using homogenized milk and also, increased with relatively decrease in case of homogenized Mozzarella cheese. Meltability of Mozzarella cheese increased with increasing the fat content and storage period and decrease with homogenization. Mozzarella cheese firmness increased with homogenization and also, increased with progressing of storage period. Flavour score, appearance and total score of Mozzarella cheese increased with homogenization and storage period progress, while body and texture score decreased with homogenization and increased with storage period progress. Microstructure of Mozzarella cheese showed the low fat cheese tends to be harder, more crumbly and less smooth than normal. Curd granule junctions were prominent in non-homogenized milk cheese. CONCLUSION: Homogenization of milk cheese caused changes in the microstructure of the Mozzarella cheese. Microstructure studies of cheese revealed that cheese made from homogenized milk is smoother and has a finer texture than non-homogenized but is also, firmer and more elastic.
Asunto(s)
Queso/análisis , Manipulación de Alimentos/métodos , Proteínas de la Leche/química , Leche/química , Animales , Búfalos , Química Física , Lípidos/química , Tamaño de la PartículaRESUMEN
Conventional F-wave responses as well as single motor unit F-wave responses together with the volitionally recruited motor unit action potentials (MUAP) were studied in hand and feet muscles of 10 healthy subjects and 32 patients with anterior horn cell disorders. The amplitude of the largest F-wave (Fl) was significantly greater in the affected patients compared with healthy subjects. Giant repeater F-wave responses "up to 4 mV" were recorded in muscles having volitionally recruited giant MUAPs. Although, the group mean percentage of motor unit F-wave responses per stimulation in all tested orthodromic MUAPs was significantly decreased in amyotrophic lateral sclerosis patients, the group mean percentage of motor unit F-wave responses per stimulation in all tested orthodromic MUAPs that gave motor unit F-wave response was significantly increased compared with healthy subjects. The responding orthodromic MUAP gave identical motor unit F-wave response, even for complex polyphasic units. Enhanced monosynaptic (H-) reflex, proximal axon reflex (A-wave), and repetitive muscle response as possible explanations for the giant F-wave responses could be discounted. The electrophysiologic behavior of the giant late responses described here fits well with the criteria of F-waves modulated by newly formed distal (and or proximal) axonal branching.
Asunto(s)
Células del Asta Anterior/fisiología , Potenciales Evocados/fisiología , Enfermedades de la Médula Espinal/fisiopatología , Anciano , Electromiografía , Femenino , Humanos , Masculino , Persona de Mediana Edad , Reflejo MonosinápticoRESUMEN
The possible mechanisms contributing to the generation of R2-like response were investigated in 19 patients with complete facial nerve paralysis, where the efferent limb of the reflex arc is absent. The first possibility that potentials produced by the unaffected orbicularis oculi (0.0c) are conducted to the reference electrode taped over the nose was confirmed as the amplitude of R2 on the affected side was significantly reduced when the reference electrode was removed from the nose and taped on the ear lobule. The second possibility of volume conducted potentials produced by muscular generator in temporalis and masseter muscles through trigemino-trigeminal reflex was suggested in some patients based on three reproducible observations: (1) EMG activity of high amplitude could be recorded with electrodes taped over the affected 0.0c muscle during voluntary teeth clenching, (2) R2-like responses were recorded in patients with bilateral complete facial paralysis, (3) R2-like responses were recorded from temporalis and masseter muscles. The contribution of extraocular muscles could be discounted as R2 could be recorded from patients with Möbius's syndrome who had complete bilateral facio-ocular paralysis. The results of the present study further support the greater value of R1--rather than R2--in predicting clinical outcome of patients with peripheral facial nerve palsy.
Asunto(s)
Parpadeo/fisiología , Electromiografía , Nervio Facial/fisiopatología , Parálisis Facial/fisiopatología , Potenciales de Acción/fisiología , Adolescente , Adulto , Enfermedades de los Nervios Craneales/fisiopatología , Femenino , Lateralidad Funcional/fisiología , Humanos , Masculino , Persona de Mediana EdadRESUMEN
The cerebral somatosensory potentials (SEP) evoked by electrical stimulation of the tibial nerve on the affected and unaffected limbs during stance and gait were recorded in 50 patients with spastic hemiplegia. On the unaffected side, the onset of the cortical activation during gait was 15 to 20ms later, and the amplitude was about 50% smaller than that recorded during stance condition. This was attributed to blocking of Ia afferent fibers during gait. SEPs recorded on the affected side during gait were, in general, of smaller amplitude and appeared with a shorter latency than in the unaffected side. During gait, 22 affected limbs showed a "Ia" blocking pattern of SEPs whereas another 28 showed a nonblocking pattern. The behavior of SEPs was analyzed with respect to three clinical identifiable recovery stages of voluntary movements in the spastic limbs (namely synergistic, isolated, and useful movements). The blocking pattern during gait was usually present in good functioning limbs, whereas the nonblocking pattern was usually present in poorly functioning limbs. It is concluded that the change in the gait pattern of hemiparetic patients represents a shift from good relevant functioning group II-afferent system to a predominance of functionally ineffective group I-afferent system.
Asunto(s)
Potenciales Evocados Somatosensoriales , Marcha/fisiología , Hemiplejía/fisiopatología , Hemiplejía/rehabilitación , Espasticidad Muscular/fisiopatología , Espasticidad Muscular/rehabilitación , Nervio Tibial/fisiología , Adulto , Vías Aferentes/fisiología , Anciano , Análisis de Varianza , Estimulación Eléctrica , Femenino , Humanos , Masculino , Persona de Mediana Edad , Tiempo de Reacción/fisiologíaRESUMEN
Surface electromyographic "EMG" activity in biceps brachii (agonist muscle) and triceps brachii (antagonist muscle) as well as the discharge behaviour of motor units "MUs" (needle recording) in biceps brachii muscle were recorded during slow (0.33 Hz) and fast (0.66 Hz) voluntary elbow flexion movements (auditory matching task) in fifty patients with spastic hemiplegia. In the spastic limbs, a long lasting, small amplitude tonic co-contraction of antagonist muscles was seen during slow flexions (SF) in 29 cases. This effect was strongest during the fast elbow flexion movements (FF). In 33 patients a triphasic pattern of muscle activation was observed on the unaffected side but not on the spastic side. The amplitude of the agonist surface EMG was significantly reduced and the amplitudes of the MU potentials recruited during maximal effort were generally smaller on the spastic side compared to the unaffected side. The agonist-antagonist activation pattern was analysed with respect to three clinically identifiable functional recovery stages of voluntary movements in the spastic limbs, namely synergistic, isolated and useful movements. The MU amplitudes and the amplitude of the surface EMG activity in the agonist muscle recorded during FF movements became significantly larger whereas the amplitude of the antagonist tonic activity became smaller with increasing functional recovery of the limb. It is concluded that impaired recruitment of type II motor units in the agonist muscles and the inability to selectively activate the agonist muscle contribute to the deficit in motor performance in spastic paresis.
Asunto(s)
Hemiplejía/fisiopatología , Trastornos del Movimiento/fisiopatología , Músculos/fisiopatología , Adulto , Anciano , Análisis de Varianza , Articulación del Codo/fisiopatología , Estimulación Eléctrica , Electromiografía , Femenino , Humanos , Masculino , Persona de Mediana Edad , Espasticidad Muscular/fisiopatología , Reclutamiento Neurofisiológico/fisiologíaRESUMEN
Reflex electromyographic (EMG) muscle responses were recorded from abductor pollicis brevis (APB) and tibialis anterior (TA) muscles of fifty patients with spastic hemiplegia. Responses in the muscles were evoked during voluntary muscle contraction (about 20% of maximum voluntary effort) by submaximal but suprathreshold electrical stimulation of the median (at the wrist) and common peroneal (at the neck of the fibula) nerves respectively. Three EMG peaks (R1, R2 and R3) could be recorded after the direct muscle response (M). There was only a slight difference in R1-R2 latency interval of about 5 ms between upper and lower limbs on the unaffected side of the patients making it unlikely that this late response of the lower limb involves a long loop pathway, although this possibility cannot be discounted for the later, R3, response. Reflex behaviour was analysed for three clinical identifiable recovery stages of voluntary movements in the spastic limbs (synergistic, isolated and useful movements). The major finding was that an increase in the amplitude of the early response "R1" was associated with a decreased amplitude and delayed latency of the late response "R2" on the spastic side. The amplitude of R1 in the three different recovery stages decreased significantly, whereas the amplitude of R2 increased significantly with improvement of the functional stage of the limb. A significant negative linear correlation was found between R1 and R2 amplitude changes in upper as well as lower limbs. A refractoriness of the motor neuron pool as a possible explanation for the decreased R2 amplitude could be discounted. These findings together with recent work on reflex development in children support the hypothesis of reciprocal modulation of early and late reflex signals by supraspinal motor centers.
Asunto(s)
Hemiplejía/fisiopatología , Espasticidad Muscular/fisiopatología , Músculos/inervación , Tiempo de Reacción/fisiología , Reflejo de Estiramiento/fisiología , Adulto , Anciano , Encéfalo/fisiopatología , Estimulación Eléctrica , Electromiografía , Femenino , Hemiplejía/rehabilitación , Humanos , Masculino , Nervio Mediano/fisiopatología , Persona de Mediana Edad , Contracción Muscular/fisiología , Espasticidad Muscular/rehabilitación , Examen Neurológico , Nervio Peroneo/fisiopatología , Médula Espinal/fisiopatologíaRESUMEN
Forty-two women of reproductive age were studied in two equal groups (group I, first-trimester pregnant; group II, non-pregnant). Each group included three equal sub-groups; subgroup A received intra-cervical 15-Me PGF2 alpha gel, B received intracervical PGE2 gel and C received intra-cervical gel alone as placebo. Three different staining techniques were employed to study the histological picture and histochemical alterations of cervical biopsies. These showed that PG-treated cervices presented significant changes compared to placebo in terms of more widely dissociated connective tissue bundles that are separated by clear spaces and an increase in the amount of ground substance. Moreover, the observed changes in pregnant sub-groups were more evident than in the corresponding non-pregnant cases.
Asunto(s)
Carboprost/farmacología , Cuello del Útero/efectos de los fármacos , Embarazo/efectos de los fármacos , Prostaglandinas E/farmacología , Prostaglandinas F Sintéticas/farmacología , Administración Tópica , Adulto , Cuello del Útero/anatomía & histología , Tejido Conectivo/anatomía & histología , Tejido Conectivo/efectos de los fármacos , Dinoprostona , Femenino , Geles , Humanos , Primer Trimestre del EmbarazoRESUMEN
PIP: The acceptability of 2 and 3 month injectable contraceptives was assessed and compared, and the acceptability of the injectables was further compared with that of oral contraceptives (OCs) and IUDs among a random sample of women, who attended a clinic in Alexandria, Egypt. The study was conducted by the University of Alexandria. The sample included 100 acceptors of the 2-month injectable, norethisterone oenanthate (NET-O EN), 100 acceptors of the 3-month injectable, depo-medroxy pregesterone acetate (DPMA), 60 OC acceptors, and 60 IUD acceptors. The women were interviewed prior to treatment and 2 or 3 times during the 6 months following their initial acceptance of the methods. Women who discontinued at any time during the 6-month period were interviewed concerning their reasons for discontinuing. The data was analyzed by calculating means and % distribution and by testing for significance. The percent lost to follow up was 12% for the NET-O EN group, 12% for DPMA users, and 0% for IUD and OC acceptors. The mean age of the acceptors was 30.4 years for NET-O EN, 30.7 years for DMPA, 28.3 years for OCs, and 25.2 years for IUDs. For these acceptor groups, the respective mean number of years of schooling was 6.1, 5.2, 7.2, and 7.5, and the respective mean number of pregnancies was 5.6, 5.4, 3.8, and 2.9. All 320 of the women were married, and 319 were Muslim. 99.4% lived in urban areas. 10% had no living male children, and 23.7% had no living female children. 2/3 of the injectable acceptors previously used 2 or more fertility control methods. A higher percent of IUD and OC acceptors, compared to injectable acceptors, reported using only 1 or no previous method. More than 1/2 of the injectable acceptors reported disruptions in their normal bleeding patterns. NET-O EN acceptors were more likely to experience heavy or prolonged bleeding while DPMA acceptors were more likely to report amenorrhea or a decreased flow. IUD acceptors were also bothered by bleeding problems. Almost all the women who reported changes in bleeding patterns were unhappy about the changes. Many of the women who reported amenorrhea worried that they might be pregnant. Women who experienced heavy or unpredictable bleeding worried about anemia and complained that bleeding interfered with their daily routines. 47.6% of the women reported weight gains, but this was generally viewed as an advantage. Nausea was the major side effect associated with OC use. 32% of the OC users, 28.0% of the NET-E ON users, 30.0% of the DMPA users, and none of the IUD users reported nausea. For all 4 groups, convenience and effectiveness were the major advantages the women attributed to their chosen method. Continuation rates were 68% for NET-O EN, 70% for DMPA, 75% for OCs, and 75% for IUDs. The major reason for discontinuation of injectables was bleeding problems. Among injectable users, a higher proportion of discontinuers (49%) than of continuers (20%) reported amenorrhea. The findings suggest that continuation for injectables could be improved if patients were given more detailed information about possible side effects and if they were advised to return to the clinic for treatment of any symptoms they experience.^ieng
Asunto(s)
Conducta Anticonceptiva , Anticoncepción , Anticonceptivos Femeninos , Anticonceptivos Orales , Enfermedad , Genitales Femeninos , Hemorragia , Inyecciones , Dispositivos Intrauterinos , Trastornos de la Menstruación , Náusea , Aceptación de la Atención de Salud , Investigación , Conducta Sexual , Signos y Síntomas , Sistema Urogenital , África , África del Norte , Biología , Anticonceptivos , Demografía , Países en Desarrollo , Egipto , Servicios de Planificación Familiar , Fertilidad , Genitales , Medio Oriente , Fisiología , Población , Dinámica PoblacionalRESUMEN
Previous data in the human generally indicate that therapeutic doses of prostaglandins (PGs) are not luteolytic. In an attempt to evaluate whether a high dose infusion (approx. 5 microgram/min for 6 hours) of a potent PG (15-methyl PGF2 alph) analogue is luteolytic, 15-methyl PGF2 alpha was administrated in the mid-luteal phase of 10 normally menstruating volunteers. The infusion induced a significant and sustained luteolytic response in 8 subjects as evidenced by a drop in progesterone levels and premature menstrual-like bleeding. In the other two cases luteal recovery was apparent from the regained normal plasma levels of progesterone and a normal cycle length. Thus, it can be concluded that luteolysis can be induced in humans by this PG provided that high dose infusions are utilized which also cause a lot of undesirable side-effects.
Asunto(s)
Carboprost/farmacología , Menstruación/efectos de los fármacos , Prostaglandinas F Sintéticas/farmacología , Adulto , Estradiol/sangre , Femenino , Humanos , Luteólisis/efectos de los fármacos , Progesterona/sangreRESUMEN
Oral glucose tolerance curves were constructed for 50 normal pregnant women, 25 pre-diabetics and 25 cases of diabetic pregnant women of different degrees of disturbance in carbohydrate metabolism. The mean rise in blood glucose level after the intake of 50 g glucose, was 53% in normal cases, and only 41% in the prediabetic cases, due to increased insulin secretion in the prediabetic group. This group of pregnants gave flat-topped curves in 60% of the cases studied, as compared to 10% of the normal pregnant cases in the same study. This was attributed to delayed insulin secretion in the prediabetic group. On the other hand, all diabetic cases gave peaked glucose tolerance curves during the first hour after glucose intake. The results of insulin-glucose tolerance test, effect of fasting for four hours and tolbutamide sensitivity test suggested that the prediabetic pregnants showed hyperinsulinemia which became evident during fasting. The pancreas of the prediabetic responds more readily, by the release of insulin, to the stimulus of oral hypoglycemic agents, such as sodium tolbutamide, than in the case of normal pregnants. Measurements of serum inorganic phosphorus, serum potassium and serum alkaline phosphatase of these 3 groups of pregnants, showed a definite disturbance in the liver function of the prediabetics which became more obvious in the diabetic group.