1,721,212 research outputs found
Ovarian endometriosis: from pathogenesis to surgical treatment
No full textPURPOSE OF REVIEW: This review analyzes the literature on ovarian endometrioma,
examining the controversies on pathogenesis, malignant transformation and
surgical therapy. RECENT FINDINGS: Recent literature reflects the necessity of
clearly defining the ethiologic and pathologic factors that determine the origin
of ovarian endometriosis and explain the increase in the condition with the
prospect of developing effective prevention therapy. The possibility that
ovarian endometriomas undergo malignant transformation is widely reported in the
literature. Recent studies underline the importance of detecting histological
differences in endometriosis (hyperplasia and atypia) and several studies of
molecular biology support the theory of genetic alterations interfering with
malignant transformation of ovarian endometriosis. SUMMARY: The surgical
approach must take into account all this information and, when the therapy is
conservative, complete excision of the disease must be laparoscopically
performed without affecting the healthy ovarian tissue
Surgical treatment by laparoscopy : overview of laparoscopic techniques for endometriosis surgery
No full textProduzione di tannini di alta qualità e polifenoli associati, estratti da essenze di noce, destinati ad applicazioni speciali (campo agroalimentare, nutraceutico, cosmetico-farmacologico) e tradizionali (settore tintorio, tessile, conciario, edilizio)
No full textL’invenzione si riferisce a processi di:-precondizionamento delle materie prime,-estrazione (dalle materie prime), -produzione (mediante utilizzo di tecnologie adatte), -purificazione (mediante utilizzo di tecnologie adatte), ed -applicazione (su processi e prodotti di filiere diverse) di Tannini di Alta Qualità e polifenoli associati (TAQ), ottenibili da vari distretti vegetativi di essenze di noce (TAQ di NOCE). Questi Tannini sono fortemente aromatici, si presentano in forma polverulenta, pastosa e liquida (in funzione della specie varietale e del distretto vegetativo - essenza - di provenienza), hanno caratteristiche di grado alimentare, sono destinati ad applicazioni come ingredienti di formulazione in campo agroalimentare (ed altri settori merceologici compatibili con l’uso dei tannini). Attualmente, non esistono in commercio prodotti e materiali analoghi, che si possano configurare come i “TAQ di NOCE” proposti in questo brevetto
Irradiation-wavelength dependent photochemistry of the bichromophoric sulfonylurea chlorsulfuron
No full textThe photochemistry of the bichromophoric sulfonylurea chlorsulfuron has been investigated at different irradiation wavelengths and environmental conditions. The identified products indicate that different reaction paths are followed, depending whether the benzene or the triazine component chromophores are excited. In the first case, the chlorine atom is substituted by hydrogen or hydroxyl in water; in the second one three competitive photodegradation paths may be followed, the most efficient one being the cleavage of the S-N bond in the sulfonylurea bridge. Photodegradation quantum yield measurements, combined with laser flash photolysis experiments have shown that, while both singlet and tripler states contribute to all photolytic paths in deaerated solution, quenching by oxygen makes the triplet contribution negligible in samples equilibrated with air. (C) 2001 Elsevier Science B.V. All rights reserved
Endometrioma excision and ovarian reserve : a dangerous relation
No full textEndometrioma is one of the most frequent pathologies in gynecologic surgery. Laparoscopic cyst excision is considered the best treatment in terms of lower recurrence and improved fertility. However, it was recently questioned whether the excision of the endometrioma could decrease the function of the operated ovary and if it could affect the subsequent fertility. Even if a consistent amount of ovarian tissue is unintentionally removed together with the capsule of the cyst, resulting in does not show the follicular pattern observed in working ovaries. Currently, no definitive data clarify whether the damage to the ovarian reserve, observed in patient with endometrioma, is related to the surgical procedure, to the previous presence of the cyst, or both. Electrosurgial coagulation during hemostasis could play an important role in terms of damage to ovarian stroma and vascularization. Particular attention must be paid in presence of bilateral endometriotic cysts. In fact, an increase in premature ovarian failure rate was reported when both the ovaries are involved in surgery. Incase of assisted reproductive techniques, no clear evidence indicates which is the best approach for concomitant endometriotic cyst. On the base of these considerations endometriomas Should be treated only in case of pain, infertility, and in asymptomatic patients if the cyst diameter is greater than 4 c
PLC-based control of a robot manipulator with closed kinematic chain
No full textThe paper describes the design and implementation
of a robot control system on a hardware platform based
on a Programmable Logic Controller (PLC). The controlled
robot is a 4 degrees of freedom (DOF) manipulator with a
closed kinematic chain, designed for high-performance pick
and place applications in a packaging workcell. The control
software is fully developed on a commercial PLC system,
using its standard programming tools and the multi-tasking
features of its operating system. In particular, the paper
analyse in detail the drawbacks and the advantages related
to the choice of standard PLCs in this kind of applications,
compared to the much common choice of specialized hardware
or industrial personal computers, with particular emphasis on
the computational performances obtained with the proposed
control architecture
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