A comparative study of the leaves of Cat hay a argyrophylla Chun & Kuang and three species of Keteleeria Carrière

Details of the cuticular, epidermal and anatomical features of the leaves of Cathaya argyrophylla Chun & Kuang, are described and compared with those of three species of Keteleeria (K. davidiana (Bertrand) Beissner, K. fortunei (Murray) Carriere, and K. chien-peii Flous). The study supports the creation of Cathaya Chun & Kuang as a new genus of the Pinaceae.     

Development of Stomata in Lactuca sativa L.

The structure of the epidermis on various parts of the plantof Lactuca sativa Linn. is described. Development of stomatais studied in young leaves and stems. Tognini (1897) has previouslymentioned that the stomata on stems of L. virosa develop froma meristemoid with four cutting faces but the present studypoints out that the meristemoid cuts off only two mesogene neighbouringcells and the two others are perigene.     

Taxonomy of the genus Ephedra. Significance of stem and leaf epidermis and cuticle

Epidermal and cuticular characters of 30 taxa of Ephedra (including 24 species and six additional varieties) are described and their taxonomic value is discussed.     

Epidermal Structure and Stomatal Ontogeny of Anemia Spp.

This paper describes the cuticle, epidermis, and the differentkinds of stomata met with in three species of Anemia.Observationsmade on the ontogeny of the Anemia type or ‘floating’stomata in A. rotundifolia show that their meristemoids giverise to a guard cell mother cell by the formation of a periclinalwall as suggested earlier by other workers.     

Development of Stomata in Equisetum

Hitherto published accounts of the development of stomata inEquisetum are conflicting about the sequence of divisions andabout the formation of a sub-stomatal cell from a meristemoid.The present study of the development of stomata in a speciesidentified as E. ramosissimum subspecies ramosissimum supportsthe observations of Strasburger (1867) and Pant and Mehra (1964)on the basis of sections cut in various planes through internodesof the plant.     

Epidermal Structure and Stomatal Ontogeny in Some Eusporangiate Ferns

Cuticles, mature epidermis, and stomatal ontogeny in some speciesof the three genera of Ophioglossaceae and in Angiopteris evectawere studied. Development of stomata is perigenous in all Ophioglossaceaebut it is mesoperigenous (Piper type) in A. evecta.     

On the possible occurrence of anisospory in some Hepaticae

PANT, D. D. & SINGH, R., 1989. On the possible occurrence of anisospory in some Hepaticae. Possible anisospory is reported for the first time in four species of Hepaticae, viz., Targionia indica Udar, Targionia hypophylla L., Cyathodium aureo-nitens Griff. (Mitt.), Cyathodium barodae Chavan. The report is based on observations of wide variations in size of spores comparable with those of anisosporous mosses of the family Orthotrichacae.     

Development of Stomata in Some Cruciferae

Epidermal structure and ontogeny of stomata are described forten species or varieties of Cruciferae. The mature stomata aretypically anisocytic. Their development is of the mesogenoustrilabrate type. The spiral sequence of divisions in the meristemoidmay be clockwise or anticlockwise. Very often the neighbouringcells divide and form successive generations of stomata whichbecome arranged in groups. Some theoretical implications ofthe study are also discussed.     

Inflammatory Lesions of the Breast: Diagnosis By Fine Needle Aspiration

Amongst 1061 breast lesions diagnosed by fine needle aspiration (FNA) over a period of 6 years (1985-1990), 128 were reported to be showing changes consistent with an inflammatory lesion. On review, the cytodiagnosis was found to be inaccurate in 31 cases. The cytological features of the 97 cases that were correctly reported are described in this report. The cytological diagnoses issued in these 97 cases were acute mastitis or breast abscess (57 cases) and tuberculous mastitis (30 cases). Non-specific chronic mastitis and miscellaneous conditions accounted for four and six cases respectively. Acid fast bacilli (AFB) were demonstrated in 28.0% of tuberculous mastitis cases and 10.0% of those diagnosed as acute mastitis or breast abscess. FNA cytology was found to be useful for the diagnosis of inflammatory lesions of breast and their classification, as only five out of 57 cases of acute mastitis/breast abscess and one out of 30 tuberculous mastitis cases were suspected on clinical grounds.     

Multiphasic uptake of phosphate by corn roots

Abstract The concentration dependence of phosphate uptake was studied using root sections of corn (Zea mays L. cv. Ganga 5). Detailed and wide-range (57 concentrations in the range 1 μmol m^?3-75 mol m^?3), precise (average SEM < 2.5%, n= 6) and reproducible (similar patterns in three independent experiments and for 5, 10, 15, 20, 25 and 30°C) data revealed six (or seven) concentration-dependent phases separated by ‘jumps’ or sharp breaks. These transitions were independent of temperature and occurred over relatively narrow concentration ranges (0.0001–0.0004, 0.08–0.31, 1.0–3.5, (7.5–10), 18–20 and 57–59 mol m^?3). The intermediate phases obeyed Michaelis-Menten kinetics, whereas sigmoidal kinetics were observed at lower concentrations. Uptake within each of the two highest phases increased more rapidly with increasing external phosphate concentration than predicted from Michaelis-Menten kinetics but also saturated more rapidly. The latter finding is not consistent with free diffusion across the plasmalemma at high external phosphate concentrations. Kinetic models yielding continuous isotherms, e.g. the sum of one or two Michaelis-Menten terms and a diffusion term, cannot account for the data.