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D R Reddy

Publications and source records attributed to D R Reddy.

At least 19 recordsLinked to original sources
PubMed2001

New molecular arrays based on a tin(IV) porphyrin scaffold.

Two new porphyrin arrays-a hexamer and a nonamer-have been synthesized and characterized by elemental analysis as well as mass, (1)H NMR, and UV-vis spectroscopic methods. The scheme of construction of these arrays employs a synthetic protocol involving sequential "organic" and "inorganic" reactions conducted, respectively, at the peripheral meso-phenyl ring and the central tin(IV) ion of the porphyrin scaffold. The architecture of the hexamer is such that it is based on a covalently linked tin(IV) porphyrin dimer, with each of the two tin(IV) centers trans-axially ligated to two free-base porphyrins, while the higher homologue features a tin(IV) porphyrin trimer as the basal unit, with its central metalloid ions having two free-base porphyrins as axial ligands. This extended, "axial-bonding"-type architecture of the new arrays has been investigated by the (1)H NMR method, which reveals characteristic ring-current-induced shifts and coupling patterns for the resonances due to protons of the axial free-base porphyrin subunits. The presence of any ring-ring (basal-basal, basal-axial, or axial-axial) interaction in these arrays is not obvious from their UV-vis and redox potential data, which are close to those of the corresponding constituent monomeric species. On the other hand, their singlet-state activities are quite different from those of the precursor reference compounds as probed by steady-state fluorescence. The results of the detailed investigations carried out on these hybrid, "bichromophoric" arrays have been interpreted in terms of the occurrence of intraarray, interchromophore energy- and electron-transfer reactions.

Journal Article↗
PubMed1998

Fluorosis.

Explore the source record for details and available documents.

Bone Diseases↗
PubMed1998

Alkaptonuria presenting as lumbar disc prolapse: case report and review of literature.

Alkaptonuria is a rare genetic disorder caused by deficiency of the enzyme homogentisic acid oxidase, resulting in accumulation of homogentisic acid in various body tissue; it produces a multisystemic disorder with a characteristic bluish-black discolouration of the skin and cartilage, termed ochranosis. Ochranosis primarily involves the large joints of the body including the spine. Spinal involvement produces loss of flexibility and ankylosis of the thoracic and lumbar segments. The clinical presentation with spondylosis and canal stenosis is common after the third and fourth decades, but intervertebral disc prolapse is unusual in ochranosis.

Adult↗
PubMed1996

Cervico-thoracic neurenteric cyst: clinicoradiological correlation with embryogenesis.

Two cases of cervico-dorsal neurenteric cysts are presented, one located dorsal and the other ventral to the spinal cord, with associated Klippel-Feil anomaly, meningocele, spinal dysraphism and possibly spinal cord malformation. One patient was operated on as a neonate for a cervico-thoracic meningocele and presented during adolescence with spastic quadriparesis. Imaging revealed spina bifida, a dorsally located neurenteric cyst and a tendency towards split cord malformation. The other child presented with cervico-thoracic kyphoscoliosis and paraparesis. Imaging demonstrated persistence of a cervico-thoracic remnant of the primitive neurenteric canal through the upper thoracic spine.

Child↗
PubMed1995

Local application of gamma-linolenic acid in the treatment of human gliomas.

gamma-Linolenic acid (GLA) has been shown to have selective tumoricidal action both in vitro and in vivo. Earlier, in a limited clinical study, we have demonstrated that intra-tumoral administration of GLA can induce regression of human gliomas. In an extension of this study, we evaluated the effect of intra-cerebral injection of GLA on normal dog brain and in 15 patients with malignant gliomas. Histopathological examination revealed that GLA is not cytotoxic to the normal dog brain cells. Administration of 10 mg of GLA via a cerebral reservoir placed in the tumour bed, at the rate of 1 mg/day over a period of 10 days, revealed that GLA is not only safe and non-toxic but can also regress cerebral gliomas as evaluated by computerised tomography and increased survival of the patients by 1.5-2 years. Based on these results and our earlier in vitro study, we suggest that GLA is a safe anti-tumour agent and recommend its use in the management of human gliomas.

Adult↗
PubMed1994

Giant syringobulbia in childhood.

A case of giant syringobulbia with syringomyelia extending to the upper dorsal region is reported. The case occurred in a 3.5-year-old girl who presented with a history of frequent bouts of severe pain in the lower neck and the shoulder blades. Simple decompression of the syrinx by open myelotomy resulted in prompt relief and reversal of symptoms.

Child, Preschool↗
PubMed1993

Neuro-radiology of skeletal fluorosis.

Though fluorosis is prevalent in certain geographic parts of the world, it is likely to occur in other parts due to industrial intoxication and also in people with latent kidney disease even when they consume relatively lower amounts of fluoride than in endemic regions. A sizeable number of patients suffering from ossified posterior longitudinal ligament (OPLL) may have fluoride intoxication as the underlying cause. The clinical, radiologic and pathologic manifestations of OPLL in non-orientals have been reported to be very similar to those in orientals. The question whether all these entities reported from different ecospheres of the globe have common aetiological factors is worthy of further research. Though plain radiology shows the characteristics of fluorosis, CT and MR imaging modalities are very helpful in early diagnosis and also in planning proper surgical intervention.

Bone Diseases↗
PubMed1993

Unusual non-osseous compression at the craniovertebral junction--a report of four cases.

A variety of congenital and acquired non-osseous compression elements at the craniovertebral junction have been known and a fibrous band among them is unusual. Unaccompanied by any bony abnormality, non-osseous compression due to thickened epidural tissue, possibly congenital, presenting in adulthood is described in four cases. The onset of symptoms was in the fourth and sixth decades. Three were males and one was a female. The clinical picture was a slowly progressive spastic quadriparesis except in the only female patient who developed sudden quadriplegia while carrying a weight over her head. MR tomography was diagnostic while CT scan ruled out any bony pathology. Release of the localised epidural constriction was performed in all; in one transorally. Good recovery ensued postoperatively while histopathology excluded infective or neoplastic pathology.

Adult↗
PubMed1989

[Fluorotic cervical spinal cord disease].

Skeletal fluorosis was reported as a disease endemic to an area in the Madras Presidency of Indian in 1937 and prior to this, it was known as an occasional disease. There are two endemic areas in India, one in Punjab and the other in Andhra Pradesh State. This disease is also endemic in some parts of China and Africa. The manual labourers are more frequently affected as they consume huge quantities of water with high fluoride levels. The cervical spine is often affected, manifesting as cord compression. Forty cases of fluorotic cervical cord compression, who underwent surgery are studied regarding their clinical features, radiological aspects and outcome following surgery. In selected cases of cervical fluorotic myelopathy, surgical decompression appears to be necessary and also rewarding.

Adult↗
PubMed1987

Meningiomas in childhood.

The clinical presentation and pathological characteristics of 18 histologically verified meningiomas in the paediatric age group are reviewed. There was a 1:1 sex ratio. Two children presented with seizures. The majority were supratentorial in location and large in size. In 4 patients, the meningiomas showed sarcomatous changes, while in 6 patients they were cystic.

Adolescent↗
PubMed1987

CT-findings in cystic meningiomas.

Cystic meningiomas are rare, about 10% occurring in children. Only 61 cases have been reported in the literature. Based on 6 of our own cases and the reports in the literature typical CT-findings are described and differentiating features from other cystic mass lesions discussed. If a tumour on CT shows a cystic component, is smoothly outlined, enhances markedly and is attached to the dura, then a preoperative diagnosis of cystic meningioma should be taken into account. This holds especially true if the patient is a child.

Adult↗
PubMed1987

Unilateral proptosis secondary to diffuse condensing osteomyelitis.

Osteomyelitis of the skull is an uncommon disease in the present days, mainly due to the advent of modern and more effective antibiotics. Hematogenous osteomyelitis is very rare. Osteomyelitis of the skull is usually not associated with sclerosis which is commonly seen in the rest of the skeleton. There are only few occasional case reports of condensing osteomyelitis wherein there was sclerosis of the bone associated with osteomyelitis of the skull and epidural abscess. An unusual case of diffuse condensing osteomyelitis of the skull producing unilateral proptosis is reported. The clinical, radiological features and microbiological aspects are presented. The proptosis was treated by excision of the bone behind the eyeball and thus relieving the proptosis and the impaired vision. The patient was given broad spectrum antibiotics for a period of two months. Further management problems are discussed.

Adult↗
PubMed1986

Cystic meningiomas in children.

Two cases of cystic meningioma simulating glioma, both clinically and radiologically, are reported and the literature is reviewed. The majority of cystic meningiomas in children are seen below the age of 1 year, with male preponderance. There is no relationship between cyst formation and histological type of meningioma.

Child↗
PubMed1986

Parasitic intracranial space-occupying lesions in children in India.

A study was carried out on parasitic intracranial space-occupying lesions in children in south India. Such lesions constitute a fraction of 1% of intracranial space-occupying lesions in India. This paper discusses three cases of cerebral and two cases of intradiploic cranial hydatid cysts, as well as six cases of cysticercosis, of which three were solitary cysts and the remainder were pseudotumors with visual deterioration.

Adolescent↗