Biomedical subjects

C Santori

Publications and source records attributed to C Santori.

5 recordsLinked to original sources

PubMed2005

Dehydroepiandrosterone sulfate and bone resorption rates as reflected by serum levels of C-terminal telopeptide of type I collagen: a study in healthy men.

Sex steroid hormones contribute to the physiological regulation of bone turnover in males. To address this issue, we investigated serum estradiol (E2), total testosterone (T), and DHEAS concentrations, along with serum levels of carboxy-terminal telopeptide of type I collagen (sCTx), in a sample of 76 healthy men aged 23 to 87. The concentration of sCTx declined with age. Both T and DHEAS, at variance with E2, showed a significant age-related decline. T, DHEAS and sCTx significantly (p<0.01) correlated with each other. DHEAS and T were significantly associated after correcting for age (r=0.35, p=0.002) or body mass index (r=0.65, p<0.0001). DHEAS, but not T, significantly correlated with sCTx after correcting for age (r=0.26, p=0.026, and r=0.20, p=0.08, respectively). Stepwise multiple regression analysis showed that only DHEAS (but not T or E2) was a significant independent predictor of sCTx (p=0.0001). Our results show that adrenal androgens play a crucial role in regulating bone resorption in aging men.

Adult↗

PubMed2001

Triggered single photons from a quantum dot.

We demonstrate a new method for generating triggered single photons. After a laser pulse generates excitons inside a single quantum dot, electrostatic interactions between them and the resulting spectral shifts allow a single emitted photon to be isolated. Correlation measurements show a reduction of the two-photon probability to 0.12 times the value for Poisson light. Strong antibunching persists when the emission is saturated. The emitted photons are also polarized.

Journal Article↗

PubMed2000

Regulated and entangled photons from a single quantum Dot

We propose a new method of generating nonclassical optical field states. The method uses a semiconductor device, which consists of a single quantum dot as active medium embedded in a p- i- n junction and surrounded by a microcavity. Resonant tunneling of electrons and holes into the quantum dot ground states, together with the Pauli exclusion principle, produce regulated single photons or regulated pairs of photons. We propose that this device also has the unique potential to generate pairs of entangled photons at a well-defined repetition rate.

Journal Article↗

PubMedDate not supplied

Kangaroo skin-to-skin care for premature twins and their adolescent parents.

Risk factors associated with prematurity and adolescent parenting greatly increase when combined with multiple birth. Kangaroo care (KC) for preterm infants is well documented, although KC with twins or with adolescent parents is mentioned only briefly. In this case study, adolescent parents experience KC with their 32-week twin sons beginning 19 hours postbirth. These young parents interacted with, responded to, and took responsibility for their newborn sons, behaviors that are sometimes difficult for adolescent parents. Thus, KC appeared to be an effective intervention for these adolescent parents. Additionally, three kinds of KC with twins were identified: separate, sequential, and shared.

Adolescent↗

PubMedDate not supplied

Kangaroo (skin-to-skin) care with a postpartum woman who felt depressed.

The mother in this case study had numerous known risk factors for postpartum depression and was in rehabilitation for drug abuse. She was crying at 2 hours postbirth and expressing feelings of sadness as her baby was being unwrapped for her first kangaroo care (KC) experience. Thereafter, during our research protocol, her self-reported depression scores decreased rapidly and had disappeared by 32 hours postbirth. A benefit of KC requiring systematic study is that KC may lessen maternal depression. There is new knowledge that some functions of the maternal HPA axis become dampened during the last trimester of pregnancy as the placenta increases its secretion of corticotrophin-releasing hormone. The sudden loss of the placenta following delivery, accompanied by a suppressed HPA axis, may have an effect on mood during the immediate postpartum period. Perhaps appropriate reactivation of the maternal HPA axis can be triggered following birth by the stimulation inherent in KC, thereby minimizing risk for postpartum depression.

Adaptation, Psychological↗