Mistletoes and mutant albino shoots on woody plants as mineral nutrient traps.

BACKGROUND AND AIMS: Potassium, sulphur and zinc contents of mistletoe leaves are generally higher than in their hosts. This is attributed to the fact that chemical elements which are cycled between xylem and phloem in the process of phloem loading of sugars are trapped in the mistletoe, because these parasites do not feed their hosts. Here it is hypothesized that mutant albino shoots on otherwise green plants should behave similarly, because they lack photosynthesis and thus cannot recycle elements involved in sugar loading. METHODS: The mineral nutrition of the mistletoe Scurrula elata was compared with that of albino shoots on Citrus sinensis and Nerium oleander. The potential for selective nutrient uptake by the mistletoe was studied by comparing element contents of host leaves on infected and uninfected branches and by manipulation of the haustorium-shoot ratio in mistletoes. Phloem anatomy of albino leaves was compared with that of green leaves. KEY RESULTS: Both mistletoes and albino leaves had higher contents of potassium, sulphur and zinc than hosts or green leaves, respectively. Hypothetical discrimination of nutrient elements during the uptake by the haustorium is not supported by our data. Anatomical studies of albino leaves showed characteristics of release phloem. CONCLUSIONS: Both albino shoots and mistletoes are traps for elements normally recycled between xylem and phloem, because retranslocation of phloem mobile elements into the mother plant or the host is low or absent. It can be assumed that the lack of photosynthetic activity in albino shoots and thus of sugars needed in phloem loading is responsible for the accumulation of elements. The absence of phloem loading is reflected in phloem anatomy of these abnormal shoots. In mistletoes the evolution of a parasitic lifestyle has obviously eliminated substantial feeding of the host with photosynthates produced by the mistletoe.

In vivo investigations on the penetration of various oils and their influence on the skin barrier.

BACKGROUND: The skin represents a potent barrier to the environment, which can be enhanced by the topical application of skin care products, such as oil and oil-based formulations by moisturizing the skin. METHODS: The aim of this study was the investigation of the penetration behaviour of four vegetable oils and of paraffin oil into the stratum corneum by laser scanning microscopy. In addition, the occlusion capacity of these substances was assessed by transepidermal water loss (TEWL) measurements. Petrolatum served as a positive control for skin occlusion. The study was conducted in vivo and included six healthy volunteers. RESULTS: Paraffin oil, as well as the vegetable oils, penetrated only into the first upper layers of the stratum corneum. TEWL measurements indicated that the application of the vegetable oils (except jojoba oil) as well as paraffin oil, led to a similar occlusion of the skin surface. The most effective occlusion was found for petrolatum. CONCLUSION: For the investigated oils, a deeper penetration than into the first upper layers of the stratum corneum could be excluded. The decreased TEWL values indicate that the application of the oils leads to a semi-occlusion of the skin surface as it is intended by the use of oils to retain moisture in skin.

[Immunonutrition after trauma]. / Immunonutrition nach Trauma.

Immunonutrition may be superior to standard clinical nutrition in specific clinical situations. After severe trauma, an enteral immuno-enhancing diet, enriched with arginine, omega-3 fatty acids, and nucleotides, decreases infectious complications. During acute respiratory distress syndrome, a continuous enteral diet with high-dose omega-3 fatty acids, gamma-linolenic acid, and antioxidants improved clinical outcome. Glutamine should be administered enterally or parenterally whenever total parenteral nutrition is indicated.

[Non-pharmacologic measures in pain therapy. Application in 25 German hospitals]. / Nichtmedikamentöse Massnahmen in der Schmerztherapie. Anwendung in 25 deutschen Krankenhäusern.

BACKGROUND: The application of non-pharmacologic therapy (NPT) within pain therapy increases patient satisfaction and is, in addition to pharmacologic methods, recommended in the National Expert Standard on Pain Management in Nursing of the German Network of Quality Development in Nursing. If and to what extent non-pharmacologic methods are applied within pain therapy in German hospitals has as yet been unknown. MATERIALS AND METHODS: Within the project "Pain-Free Hospital" 2,840 nurses in 25 hospitals were interviewed via questionnaire forms and oral interviews about the use of NPT. RESULTS: Of the nurses 80% confirmed the use of NPT. The majority of the interviewed nurses applied superficial cold, bedding and heat for pain relief. We identified barriers to the implementation of NPT, such as the scarce knowledge of nurses about these therapeutic areas and the uncertainty whether NPT needs to be described by doctors or not. CONCLUSION: Some of the NPTs are well established in hospitals. For nationwide use of NPT their systematic training and implementation is necessary.

Prevention of follicular penetration: barrier-enhancing formulations against the penetration of pollen allergens into hair follicles.

The hair follicles could be a reservoir for topically applied substances. They are not only surrounded by a close network of blood capillaries, which makes them interesting for drug delivery, but they are also the host of dendritic cells, which are important for immunomodulation. Previously, pollen allergens were shown to penetrate into the hair follicles. The application of barrier-enhancing formulations might represent an effective strategy to prevent pollen protein penetration into the hair follicle. In the present study, porcine skin areas were pretreated with 4 barrier-enhancing emulsions. One skin area served as control and remained without pretreatment. Afterwards, fluorescein-isothiocyanate-labeled grass pollen proteins were applied to the porcine skin samples, and their penetration was investigated via fluorescent laser scanning microscopy. It was shown that the barrier-enhancing formulations were able to significantly reduce the penetration of exogenous proteins into the hair follicles, the extent of such reduction depending on the formulation.

Discovery of potent and selective histamine H3 receptor inverse agonists based on the 3,4-dihydro-2H-pyrazino[1,2-a]indol-1-one scaffold.

A novel series of potent histamine H(3) receptor inverse agonists based on the 3,4-dihydro-2H-pyrazino[1,2-a]indol-1-one scaffold has been discovered. Several compounds display high selectivity over other histamine receptor subtypes and have favorable physicochemical properties, low potential for CYP450 enzyme inhibition and high metabolic stability in microsomal preparations. (R)-2-Cyclopropylmethyl-8-(1-isopropyl-piperidin-4-yloxy)-3-methyl-3,4-dihydro-2H-pyrazino[1,2-a]indol-1-one (8t) showed good in vivo efficacy after per os application in an acute rat dipsogenia model of water intake.

Identification and characterisation of a bryophyte polyphenol oxidase encoding gene from Physcomitrella patens.

Polyphenol oxidases (PPO) are enzymes of secondary plant metabolism that catalyse the oxidation of polyphenols to quinones. Because of their ubiquitous appearance in the plant kingdom, an important role is assumed; however, the exact physiological function of PPOs remains unclear. In this work, the identification, cloning, and characterisation of a bryophyte PPO from the moss Physcomitrella patens is presented. PPO activity from protein extracts was determined polarographically after activation by SDS. Four Physcomitrella ESTs with homologies to known plant PPOs were selected from publicly accessible databases, and PCR experiments demonstrated that they belong to the same gene, named Pp_ppo1. The identified cDNA was found to be 2402 bp long, containing a single open reading frame of 1611 bp encoding for a 536 amino acid protein with a molecular mass of 60.1 kDa. Cloning and sequencing of a genomic part of Pp_ppo1 revealed the presence of a 94-bp intron. The time course of Pp_ppo1 gene expression in liquid culture was monitored by real time RT-PCR, revealing increasing transcription levels until the 4th day, a maximum between the 4th and the 8th day, and decreasing transcription until the 12th day. A comparison of the deduced amino acid sequence of Pp_ppo1 with seed plant PPOs revealed similarities such as the presence of two highly conserved copper-binding domains and a similar pattern of hydrophobic regions, but also differences such as a stronger membrane association and a shorter signal sequence, thus reflecting the phylogenetic distance of Physcomitrella from seed plants.

Massive pelvic hemangioma in a patient with blue rubber bleb nevus syndrome.

Blue rubber bleb nevus syndrome (BRBNS) is a rare disorder characterized by gastrointestinal and cutaneous hemangiomas. Patients typically present with gastrointestinal bleeding and anemia. Management of gastrointestinal bleeding may be challenging, since these lesions may be diffusely distributed throughout the gastrointestinal tract. The most common location is the small bowel, and recurrence is common. We describe a patient with BRBNS and lower gastrointestinal bleeding resulting from a large pelvic hemangioma eroding into the rectal wall.

Successful monotherapy of severe and intractable atopic dermatitis by photopheresis.

BACKGROUND: Patients with chronic atopic dermatitis can become unresponsive to standard immunosuppressive therapy and thus pose a serious therapeutic problem. OBJECTIVE: Our purpose was to evaluate the therapeutic effectiveness of photopheresis in the management of patients with severe and intractable atopic dermatitis. METHODS: Photopheresis was used as monotherapy in patients (n = 3) who previously did not respond to treatment with glucocorticosteroids, cyclosporine, phototherapy, or photochemotherapy. Patients were treated at 2-week intervals (total number of treatments = 10). RESULTS: In all patients, photopheresis induced clinical improvement and reduction of elevated serum levels of eosinophil cationic protein and total IgE. Prolongation of the intervals between treatments from 2 to 4 weeks caused worsening in one patient, whereas shortening of treatment-free intervals improved both clinical and laboratory findings. CONCLUSION: These studies indicate that photopheresis may be used as monotherapy for the treatment of patients with severe atopic dermatitis that has become intractable to standard therapeutic modalities.

Antioxidant therapy using high dose vitamin C: reduction of postburn resuscitation fluid volume requirements.

Twenty-four guinea pigs with third degree burns over 70% of the body surface area were divided equally into four groups. At 0.5 hours postburn, all groups received Ringer's lactate solution (R/L) according to the Parkland formula. The infusion rate was then reduced to 25% of the Parkland formula at 1.5 hours postburn. Group 1 received only R/L, and groups 2, 3 and 4 received adjuvant vitamin C (14.2 mg/kg/hr) until 4, 8, and 24 hours postburn, respectively. The volume of R/L was reduced by that of vitamin C solution so that the hourly sodium and fluid intake in each group was the same. Groups 1 and 2 demonstrated higher hematocrit and lower cardiac output values than did group 3, suggesting hypovolemia and hemoconcentration in these groups. Group 3 showed hematocrit and cardiac output values equivalent to those in group 4. We conclude that high dose vitamin C infusion maintains hemodynamic stability in the presence of a reduced resuscitation fluid volume provided vitamin C is administered for a minimum of 8 hours postburn.

[Spontaneous brain abscess--bacteriology, therapy and prognosis]. / Spontane Hirnabszesse--Bakteriologie, Therapie und Prognose.

Spontaneous intracranial abscesses are quite rare in western industrial countries. According to the recently published papers, each neurosurgical centre is expecting 2 to 4 cases a year. Whereas in the last three years we only operated on one or two cases a year we treated 8 cases in the first ten months of 1994. Although this remarkable increase is not statistically significant, further observations seem to be indicated. In 5 cases the origin of the abscess remained unknown. 3 patients had odontogeneous focuses, 2 middle ear and 2 pulmonary infections. One patient was operated on for spontaneous liver abscess few days before. Streptococcus was found in 9 cases, Bacteroides, Nocardia and Rhodoturola in 1 case each. For one patient no pathogen could be detected. In regard of our results, minimal invasive neurosurgical aspiration of the abscess with adjacent longterm antibiotic therapy gives a good prognosis with little morbidity. In contrast the mortality rate rises if diagnostic procedures are delayed or if the detected microorganism is highly resistant to current antibiotics.

Velocity percepts of apparent laser speckle motion modulated by voluntary changes of visual accommodation: real-time, in-vivo measurements of the accommodative response.

This study examined negative volitional accommodation under open-loop viewing conditions by means of a coherent laser light pattern (633 nm) whose direction and velocity of motion is determined by the refractive state of the eye. Using the direct scaling procedure of free magnitude estimation, the subjects were required to quantitatively judge velocities of speckles when the retinal image of the subjects' eye was minimally influenced and when the subject was instructed to exert voluntary negative accommodation. Real-time, in-vivo measures of accommodation indicated that the dioptric strength of the crystalline eye lens was reduced under the condition of mental effort, and that the volitional accommodation values ranged between -0.26 and -1.90 D. The amplitude of these responses were noticeably correlated with individual measures of dark focus, so that larger dark focus values were associated with higher amplitudes of the voluntary negative response, and vice versa. By converting the dioptric strength of added optical lenses and the in-vivo measures of the eye lens curvature into angular velocities of laser speckles whose speed changes with focus relative the plane of stationarity, a specification of the proximal stimulus flow was obtained. The psychophysical functions describing the relationship between subjective speed and angular velocity generated either by placing lenses in front of the eye or by voluntary changes in accommodation had approximately the same appearance suggesting that the percepts reported by the subjects were valid and veridical estimates of the velocity of speckle movement.

[Fracture load of ceramic ball heads of hip joint prostheses]. / Bruchlast keramischer Kugelköpfe von Hüftgelenkprothesen.

To ensure the stability of ceramic ball heads of hip joint prostheses over the long term, both standards for the material and FDA-regulations for the components have been established. In this paper the philosophy underlying design and reliability is discussed. On the basis of fracture loads determined for Biolox ball heads the high level of stability and reliability that has been achieved and can now be guaranteed, is demonstrated.

Air cooling for an interstitial microwave hyperthermia antenna: theory and experiment.

Microwave antennas are inserted through brachytherapy catheters implanted in a tumor to deliver interstitial hyperthermia cancer therapy. Theoretical calculations show that a cooling rate on the order of 0.1 W/cm length of catheter will significantly improve the radial uniformity of the temperature distribution of single antennas or arrays. Experiments and theoretical calculations show that air passing through the annulus between the antenna and the catheter at 10 L/min or less will produce such a cooling rate in a 2.2-mm OD catheter that has both ends accessible. To maintain uniformity of cooling rate along the catheter, it is better to control the cooling rate by preheating the air entering the catheter to 30-40 degrees C than it is to control the flow rate of room-temperature air. Ohmic heating of the antenna feedline does not confound the air cooling action significantly.

[The difficult path of critical psychosomatic medicine]. / Der schwierige Weg einer kritischen Psychosomatik.

In our present-day society that openly worships strength and secretly represses death, psychosomatic medicine is on the horns of a dilemma: either to externalize this repressive attitude and thus to translate it into reality so to say by de-interiorization, or to critically defend a mental health concept that can be considered as representing a unification of inner and outer ecology.

[The significance of psychology in medicine]. / Die Bedeutung der Psychologie in der Medizin.

It is shown in a retrospective review how the specific political climate twenty years ago helped to establish psychosomatics, psychotherapy and medical psychology as disciplines in their own right. The "reform-minded" trend gave psychotherapy recognition as a treatment method to be acknowledged as cost-refundable under the Federal German health insurance system. Furthermore, it prompted the Federal German government to start an inquiry into the present situation of psychiatry and psychosomatic medicine, whereas research workers at the base developed models of psychosocial working teams and of a renewal of sociopsychiatry. Meanwhile the political "turnabout" in the Federal Republic from a socioliberal to a predominantly conservative line has produced a conservative countercurrent: the medical institutions undergo reinstatement of ancient hierarchies, jobs in the psychosocial sphere are being dramatically axed, psychosomatics is being streamlined as an adapted auxiliary discipline ruled with an iron hand by a dramatically expanding clinical pathology or laboratory medicine and by a concept of "health" that is purely functional. Basing on the case history of a woman suffering from psychogenic sterility the author critically discusses the gap-clearly noticeable although frequently denied-now dividing the individual disciplines and schools of psychological medicine, separating in each case a preferably conformistic branch from a critically engaged one.

[Experiments on the biosynthesis of UDP-Glucuronyltransferase and UDP-Glucosyltransferase under the influence of eucalyptol (author's transl)]. / Untersuchungen zum Wirkungsmechanismus von Eucalyptol auf die Biosynthese der UDP-Glucuronyltransferase und UDP-Glucosyltransferase

To elucidate the reaction mechanism of the increased elimination rate of bilirubin in the blood of newborns under the influence of Eucalyptol, we performed a study on young mice. The following results were obtained: UDPGA-T activity is increased 33%, if measured with 4-MU as substrate after a single injection (i.p.) of Eucalyptol (0.3 mg/g body weight), with bilirubin as substrate the increase is 112%. UDPG-T activity increases 29%. The enhancement of enzyme activities can be inhibited by Actinomycin D (1 MUg/g body weight) 30% (bilirubin), 48% (4-MU) respectively in the case of UDPGA-T. Under cycloheximide (2 mug/g body weight) the increase of the activity of UDPGA-T is suppressed by 59% (bilirubin) or 99% (4-MU) as compared to the corresponding controls. No significant difference in the activity of UDPG-T by actinomycin or cycloheximide can be observed between the controls and the Eucalyptol-treated group. We conclude that the increase of enzyme activity of UDPGA-T is mainly due to enzyme induction, while in the case of UDPG-T activation of enzyme molecules might be the underlying mechanism. The effect of Eucalyptol on the bilirubin level in the blood of newborns is comparable to the effect of phenobarbital.